v0.0.632 Pubsub.PublishAsync

(cherry picked from commit c0443af63b)

.gitea/workflows/tests.yml

@@ -0,0 +1,42 @@
+
+# https://docs.gitea.com/next/usage/actions/quickstart
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+# https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
+
+name: Build Docker and Deploy
+run-name: Build & Deploy ${{ gitea.ref }} on ${{ gitea.actor }}
+
+on:
+  push:
+    branches:
+      - '*'
+      - '**'
+
+
+jobs:
+  run_tests:
+    name: Run goext test-suite  
+    runs-on: bfb-cicd-latest
+    steps:
+
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: '${{ gitea.workspace }}/go.mod'
+
+      - name: Setup packages
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: curl python3
+          version: 1.0
+
+      - name: go version
+        run: go version
+
+      - name: Run tests
+        run: cd "${{ gitea.workspace }}" && make test
+
+

.idea/.gitignore

@@ -6,3 +6,5 @@
 # Datasource local storage ignored files
 /dataSources/
 /dataSources.local.xml
+# GitHub Copilot persisted chat sessions
+/copilot/chatSessions

.idea/copilot.data.migration.agent.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AgentMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.ask.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AskMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.ask2agent.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Ask2AgentMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/copilot.data.migration.edit.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="EditMigrationStateService">
+    <option name="migrationStatus" value="COMPLETED" />
+  </component>
+</project>

.idea/go.imports.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GoImports">
+    <option name="excludedPackages">
+      <array>
+        <option value="github.com/pkg/errors" />
+        <option value="golang.org/x/net/context" />
+      </array>
+    </option>
+  </component>
+</project>

.idea/goext.iml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="WEB_MODULE" version="4">
-  <component name="Go" enabled="true" />
+  <component name="Go" enabled="true">
+    <buildTags>
+      <option name="goVersion" value="1.19" />
+    </buildTags>
+  </component>
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$" />
     <orderEntry type="inheritedJdk" />

.idea/golinter.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GoLinterSettings">
+    <option name="checkGoLinterExe" value="false" />
+  </component>
+</project>

.idea/sqldialects.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/sq/sq_test.go" dialect="SQLite" />
+  </component>
+</project>

Makefile

@@ -3,7 +3,15 @@ run:
 	echo "This is a library - can't be run" && false
 
 test:
-	go test ./...
+	# go test ./...
+	which gotestsum || go install gotest.tools/gotestsum@latest
+	gotestsum --format "testname" -- -tags="timetzdata sqlite_fts5 sqlite_foreign_keys" "./..."
+
+test-in-docker:
+	tag="goext_temp_test_image:$(shell uuidgen | tr -d '-')";        \
+	docker build --tag $$tag . -f .gitea/workflows/Dockerfile_tests; \
+	docker run --rm $$tag;                                           \
+	docker rmi $$tag
 
 version:
 	_data/version.sh

README.md

@@ -5,4 +5,111 @@ A collection of general & useful library methods
 
 This should not have any heavy dependencies (gin, mongo, etc) and add missing basic language features...
 
-Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
+Potentially needs `export GOPRIVATE="git.blackforestbytes.com"`
+
+
+## Packages:
+
+| Name        | Maintainer | Description                                                                                                   |
+|-------------|------------|---------------------------------------------------------------------------------------------------------------|
+| langext     | Mike       | General uttility/helper functions, (everything thats missing from go standard library)                        |
+| mathext     | Mike       | Utility/Helper functions for math                                                                             |
+| cryptext    | Mike       | Utility/Helper functions for encryption                                                                       |
+| syncext     | Mike       | Utility/Helper funtions for multi-threading / mutex / channels                                                |
+| dataext     | Mike       | Various useful data structures                                                                                |
+| zipext      | Mike       | Utility for zip/gzip/tar etc                                                                                  |
+| reflectext  | Mike       | Utility for golang reflection                                                                                 |
+| fsext       | Mike       | Utility for filesytem access                                                                                  |
+| ctxext      | Mike       | Utility for context.Context                                                                                   |
+|             |            |                                                                                                               |
+| mongoext    | Mike       | Utility/Helper functions for mongodb (kinda abandoned)                                                        |
+| cursortoken | Mike       | MongoDB cursortoken implementation                                                                            |
+| pagination  | Mike       | Pagination implementation                                                                                     |
+|             |            |                                                                                                               |
+| ginext      | Mike       | gin wrapper                                                                                                   |
+| wsw         | Mike       | websocket wrapper                                                                                             |
+|             |            |                                                                                                               |
+| totpext     | Mike       | Implementation of TOTP (2-Factor-Auth)                                                                        |
+| termext     | Mike       | Utilities for terminals (mostly color output)                                                                 |
+| confext     | Mike       | Parses environment configuration into structs                                                                 |
+| cmdext      | Mike       | Runner for external commands/processes                                                                        |
+| excelext    | Mike       | Build Excel files                                                                                             |
+|             |            |                                                                                                               |
+| sq          | Mike       | Utility functions for sql based databases (primarily sqlite)                                                  |
+| tst         | Mike       | Utility functions for unit tests                                                                              |
+|             |            |                                                                                                               |
+| rfctime     | Mike       | Classes for time seriallization, with different marshallign method for mongo and json                         |
+| gojson      | Mike       | Same interface for marshalling/unmarshalling as go/json, except with proper serialization of null arrays/maps |
+|             |            |                                                                                                               |
+| bfcodegen   | Mike       | Various codegen tools (run via go generate)                                                                   |
+|             |            |                                                                                                               |
+| rext        | Mike       | Regex Wrapper, wraps regexp with a better interface                                                           |
+| wmo         | Mike       | Mongo Wrapper, wraps mongodb with a better interface                                                          |
+|             |            |                                                                                                               |
+| scn         | Mike       | SimpleCloudNotifier                                                                                           |
+|             |            |                                                                                                               |
+
+
+
+## Usage:
+
+### exerr
+
+ - see **mongoext/builder.go** for full info
+
+Short summary:
+ - An better error package with metadata, listener, api-output and error-traces
+ - Initialize with `exerr.Init()`
+ - *Never* return `err` direct, always use exerr.Wrap(err, "...") - add metadata where applicable
+ - at the end either Print(), Fatal() or Output() your error (print = stdout, fatal = panic, output = json API response)
+ - You can add listeners with exerr.RegisterListener(), and save the full errors to a db or smth
+
+### wmo
+
+ - A typed wrapper around the official mongo-go-driver
+ - Use `wmo.W[...](...)` to wrap the collections and type-ify them
+ - The new collections have all the usual methods, but types
+ - Also they have List() and Paginate() methods for paginated listings (witehr with a cursortoken or page/limit)
+ - Register additional hooks with `WithDecodeFunc`, `WithUnmarshalHook`, `WithMarshalHook`, `WithModifyingPipeline`, `WithModifyingPipelineFunc`
+ - List(), Paginate(), etc support filter interfaces
+   - Rule(s) of thumb: 
+     - filter the results in the filter interface
+     - sort the results in the sort function of the filter interface
+     - add joins ($lookup's) in the `WithModifyingPipelineFunc`/`WithModifyingPipeline`
+
+#### ginext
+
+ - A wrapper around gin-gonic/gin
+ - create the gin engine with `ginext.NewEngine`
+ - Add routes with `engine.Routes()...`
+   - `.Use(..)` adds a middleware
+   - `.Group(..)` adds a group
+   - `.Get().Handle(..)` adds a handler
+ - Handler return values (in contract to ginext) - values implement the `ginext.HTTPResponse` interface
+ - Every handler starts with something like:
+```go 
+func (handler Handler) CommunityMetricsValues(pctx ginext.PreContext) ginext.HTTPResponse {
+    type communityURI struct {
+        Version     string             `uri:"version"`
+        CommunityID models.CommunityID `uri:"cid"`
+    }
+    type body struct {
+        UserID  models.UserID  `json:"userID"`
+        EventID models.EventID `json:"eventID"`
+    }
+
+    var u uri
+    var b body
+    ctx, gctx, httpErr := pctx.URI(&u).Body(&b).Start() // can have more unmarshaller, like header, form, etc
+    if httpErr != nil {
+    	return *httpErr
+    }
+    defer ctx.Cancel()
+
+    // do stuff
+}
+```
+
+#### sq
+
+ - TODO (like mongoext for sqlite/sql databases)

TODO.md

@@ -0,0 +1,9 @@
+
+
+ - cronext
+
+ - rfctime.HMSTimeOnly
+ - rfctime.NanoTimeOnly
+
+ - remove sqlx dependency from sq  (unmaintained, and mostly superseeded by our own stuff?)
+ - Move DBLogger and DBPreprocessor to sq

_data/version.sh

@@ -21,8 +21,15 @@ if [ "$( git rev-parse --abbrev-ref HEAD )" != "master" ]; then
   exit 1
 fi
 
+echo ""
+echo -n "Insert optional commit message: "
+read commitMessage
+echo ""
+
 git pull --ff
 
+go get -u ./...
+
 curr_vers=$(git describe --tags --abbrev=0 | sed 's/v//g')
 
 next_ver=$(echo "$curr_vers" | awk -F. -v OFS=. 'NF==1{print ++$NF}; NF>1{if(length($NF+1)>length($NF))$(NF-1)++; $NF=sprintf("%0*d", length($NF), ($NF+1)%(10^length($NF))); print}')
@@ -32,10 +39,17 @@ echo "> Current Version: ${curr_vers}"
 echo "> Next    Version: ${next_ver}"
 echo ""
 
+printf "package goext\n\nconst GoextVersion = \"%s\"\n\nconst GoextVersionTimestamp = \"%s\"\n" "${next_ver}" "$( date +"%Y-%m-%dT%H:%M:%S%z" )" > "goextVersion.go"
+
 git add --verbose .
 
 msg="v${next_ver}"
 
+if [[ "$commitMessage" != "" ]]; then
+  msg="${msg} ${commitMessage}"
+fi
+
+
 if [ $# -gt 0 ]; then
   msg="$1"
 fi

bfcodegen/csid-generate.go

@@ -0,0 +1,197 @@
+package bfcodegen
+
+import (
+	"bytes"
+	_ "embed"
+	"errors"
+	"fmt"
+	"go/format"
+	"git.blackforestbytes.com/BlackForestBytes/goext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cryptext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/rext"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"text/template"
+)
+
+type CSIDDef struct {
+	File         string
+	FileRelative string
+	Name         string
+	Prefix       string
+}
+
+type CSIDGenOptions struct {
+	DebugOutput *bool
+}
+
+var rexCSIDPackage = rext.W(regexp.MustCompile(`^package\s+(?P<name>[A-Za-z0-9_]+)\s*$`))
+
+var rexCSIDDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s+string\s*//\s*(@csid:type)\s+\[(?P<prefix>[A-Z0-9]{3})].*$`))
+
+var rexCSIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumCharsetIDGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
+
+//go:embed csid-generate.template
+var templateCSIDGenerateText string
+
+func GenerateCharsetIDSpecs(sourceDir string, destFile string, opt CSIDGenOptions) error {
+
+	debugOutput := langext.Coalesce(opt.DebugOutput, false)
+
+	files, err := os.ReadDir(sourceDir)
+	if err != nil {
+		return err
+	}
+
+	oldChecksum := "N/A"
+	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		if m, ok := rexCSIDChecksumConst.MatchFirst(string(content)); ok {
+			oldChecksum = m.GroupByName("cs").Value()
+		}
+	}
+
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return v.Name() != path.Base(destFile) })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return strings.HasSuffix(v.Name(), ".go") })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return !strings.HasSuffix(v.Name(), "_gen.go") })
+	langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
+
+	newChecksumStr := goext.GoextVersion
+	for _, f := range files {
+		content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
+		if err != nil {
+			return err
+		}
+		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
+	}
+
+	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
+
+	if newChecksum != oldChecksum {
+		fmt.Printf("[CSIDGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+	} else {
+		fmt.Printf("[CSIDGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
+		return nil
+	}
+
+	allIDs := make([]CSIDDef, 0)
+
+	pkgname := ""
+
+	for _, f := range files {
+		if debugOutput {
+			fmt.Printf("========= %s =========\n\n", f.Name())
+		}
+
+		fileIDs, pn, err := processCSIDFile(sourceDir, path.Join(sourceDir, f.Name()), debugOutput)
+		if err != nil {
+			return err
+		}
+
+		if debugOutput {
+			fmt.Printf("\n")
+		}
+
+		allIDs = append(allIDs, fileIDs...)
+
+		if pn != "" {
+			pkgname = pn
+		}
+	}
+
+	if pkgname == "" {
+		return errors.New("no package name found in any file")
+	}
+
+	fdata, err := format.Source([]byte(fmtCSIDOutput(newChecksum, allIDs, pkgname)))
+	if err != nil {
+		return err
+	}
+
+	err = os.WriteFile(destFile, fdata, 0o755)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func processCSIDFile(basedir string, fn string, debugOutput bool) ([]CSIDDef, string, error) {
+	file, err := os.Open(fn)
+	if err != nil {
+		return nil, "", err
+	}
+
+	defer func() { _ = file.Close() }()
+
+	bin, err := io.ReadAll(file)
+	if err != nil {
+		return nil, "", err
+	}
+
+	lines := strings.Split(string(bin), "\n")
+
+	ids := make([]CSIDDef, 0)
+
+	pkgname := ""
+
+	for i, line := range lines {
+		if i == 0 && strings.HasPrefix(line, "// Code generated by") {
+			break
+		}
+
+		if match, ok := rexCSIDPackage.MatchFirst(line); i == 0 && ok {
+			pkgname = match.GroupByName("name").Value()
+			continue
+		}
+
+		if match, ok := rexCSIDDef.MatchFirst(line); ok {
+
+			rfp, err := filepath.Rel(basedir, fn)
+			if err != nil {
+				return nil, "", err
+			}
+
+			def := CSIDDef{
+				File:         fn,
+				FileRelative: rfp,
+				Name:         match.GroupByName("name").Value(),
+				Prefix:       match.GroupByName("prefix").Value(),
+			}
+
+			if debugOutput {
+				fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+			}
+
+			ids = append(ids, def)
+		}
+	}
+
+	return ids, pkgname, nil
+}
+
+func fmtCSIDOutput(cs string, ids []CSIDDef, pkgname string) string {
+	templ := template.Must(template.New("csid-generate").Parse(templateCSIDGenerateText))
+
+	buffer := bytes.Buffer{}
+
+	err := templ.Execute(&buffer, langext.H{
+		"PkgName":      pkgname,
+		"Checksum":     cs,
+		"GoextVersion": goext.GoextVersion,
+		"IDs":          ids,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	return buffer.String()
+}

bfcodegen/csid-generate.template

@@ -0,0 +1,194 @@
+// Code generated by csid-generate.go DO NOT EDIT.
+
+package {{.PkgName}}
+
+import "crypto/rand"
+import "crypto/sha256"
+import "fmt"
+import "github.com/go-playground/validator/v10"
+import "github.com/rs/zerolog/log"
+import "git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+import "git.blackforestbytes.com/BlackForestBytes/goext/langext"
+import "git.blackforestbytes.com/BlackForestBytes/goext/rext"
+import "math/big"
+import "reflect"
+import "regexp"
+import "strings"
+
+const ChecksumCharsetIDGenerator = "{{.Checksum}}" // GoExtVersion: {{.GoextVersion}}
+
+const idlen = 24
+
+const checklen = 1
+
+const idCharset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+const idCharsetLen = len(idCharset)
+
+var charSetReverseMap = generateCharsetMap()
+
+const ({{range .IDs}}
+	prefix{{.Name}} = "{{.Prefix}}" {{end}}
+)
+
+var ({{range .IDs}}
+	regex{{.Name}} = generateRegex(prefix{{.Name}}) {{end}}
+)
+
+func generateRegex(prefix string) rext.Regex {
+	return rext.W(regexp.MustCompile(fmt.Sprintf("^%s[%s]{%d}[%s]{%d}$", prefix, idCharset, idlen-len(prefix)-checklen, idCharset, checklen)))
+}
+
+func generateCharsetMap() []int {
+	result := make([]int, 128)
+	for i := 0; i < len(result); i++ {
+		result[i] = -1
+	}
+	for idx, chr := range idCharset {
+		result[int(chr)] = idx
+	}
+	return result
+}
+
+func generateID(prefix string) string {
+	k := ""
+	csMax := big.NewInt(int64(idCharsetLen))
+	checksum := 0
+	for i := 0; i < idlen-len(prefix)-checklen; i++ {
+		v, err := rand.Int(rand.Reader, csMax)
+		if err != nil {
+			panic(err)
+		}
+		v64 := v.Int64()
+		k += string(idCharset[v64])
+		checksum = (checksum + int(v64)) % (idCharsetLen)
+	}
+	checkstr := string(idCharset[checksum%idCharsetLen])
+	return prefix + k + checkstr
+}
+
+func generateIDFromSeed(prefix string, seed string) string {
+	h := sha256.New()
+
+	iddata := ""
+	for len(iddata) < idlen-len(prefix)-checklen {
+		h.Write([]byte(seed))
+		bs := h.Sum(nil)
+		iddata += langext.NewAnyBaseConverter(idCharset).Encode(bs)
+	}
+
+	checksum := 0
+	for i := 0; i < idlen-len(prefix)-checklen; i++ {
+		ichr := int(iddata[i])
+		checksum = (checksum + charSetReverseMap[ichr]) % (idCharsetLen)
+	}
+
+	checkstr := string(idCharset[checksum%idCharsetLen])
+
+	return prefix + iddata[:(idlen-len(prefix)-checklen)] + checkstr
+}
+
+func validateID(prefix string, value string) error {
+	if len(value) != idlen {
+		return exerr.New(exerr.TypeInvalidCSID, "id has the wrong length").Str("value", value).Build()
+	}
+
+	if !strings.HasPrefix(value, prefix) {
+		return exerr.New(exerr.TypeInvalidCSID, "id is missing the correct prefix").Str("value", value).Str("prefix", prefix).Build()
+	}
+
+	checksum := 0
+	for i := len(prefix); i < len(value)-checklen; i++ {
+		ichr := int(value[i])
+		if ichr < 0 || ichr >= len(charSetReverseMap) || charSetReverseMap[ichr] == -1 {
+			return exerr.New(exerr.TypeInvalidCSID, "id contains invalid characters").Str("value", value).Build()
+		}
+		checksum = (checksum + charSetReverseMap[ichr]) % (idCharsetLen)
+	}
+
+	checkstr := string(idCharset[checksum%idCharsetLen])
+
+	if !strings.HasSuffix(value, checkstr) {
+		return exerr.New(exerr.TypeInvalidCSID, "id checkstring is invalid").Str("value", value).Str("checkstr", checkstr).Build()
+	}
+
+	return nil
+}
+
+func getRawData(prefix string, value string) string {
+	if len(value) != idlen {
+		return ""
+	}
+	return value[len(prefix) : idlen-checklen]
+}
+
+func getCheckString(prefix string, value string) string {
+	if len(value) != idlen {
+		return ""
+	}
+	return value[idlen-checklen:]
+}
+
+func ValidateEntityID(vfl validator.FieldLevel) bool {
+	if !vfl.Field().CanInterface() {
+		log.Error().Msgf("Failed to validate EntityID (cannot interface ?!?)")
+		return false
+	}
+
+	ifvalue := vfl.Field().Interface()
+
+	if value1, ok := ifvalue.(EntityID); ok {
+
+		if vfl.Field().Type().Kind() == reflect.Pointer && langext.IsNil(value1) {
+			return true
+		}
+
+		if err := value1.Valid(); err != nil {
+			log.Debug().Msgf("Failed to validate EntityID '%s' (%s)", value1.String(), err.Error())
+			return false
+		} else {
+			return true
+		}
+
+	} else {
+		log.Error().Msgf("Failed to validate EntityID (wrong type: %T)", ifvalue)
+		return false
+	}
+}
+
+{{range .IDs}}
+
+// ================================ {{.Name}} ({{.FileRelative}}) ================================
+
+func New{{.Name}}() {{.Name}} {
+	return {{.Name}}(generateID(prefix{{.Name}}))
+}
+
+func (id {{.Name}}) Valid() error {
+	return validateID(prefix{{.Name}}, string(id))
+}
+
+func (i {{.Name}}) String() string {
+	return string(i)
+}
+
+func (i {{.Name}}) Prefix() string {
+	return prefix{{.Name}}
+}
+
+func (id {{.Name}}) Raw() string {
+	return getRawData(prefix{{.Name}}, string(id))
+}
+
+func (id {{.Name}}) CheckString() string {
+	return getCheckString(prefix{{.Name}}, string(id))
+}
+
+func (id {{.Name}}) IsZero() bool {
+	return id == ""
+}
+
+func (id {{.Name}}) Regex() rext.Regex {
+	return regex{{.Name}}
+}
+
+{{end}}

bfcodegen/csid-generate_test.go

@@ -0,0 +1,52 @@
+package bfcodegen
+
+import (
+	_ "embed"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cmdext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+//go:embed _test_example_1.tgz
+var CSIDExampleModels1 []byte
+
+func TestGenerateCSIDSpecs(t *testing.T) {
+
+	tmpFile := filepath.Join(t.TempDir(), langext.MustHexUUID()+".tgz")
+
+	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
+
+	err := os.WriteFile(tmpFile, CSIDExampleModels1, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.Remove(tmpFile) })
+
+	err = os.Mkdir(tmpDir, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.RemoveAll(tmpFile) })
+
+	_, err = cmdext.Runner("tar").Arg("-xvzf").Arg(tmpFile).Arg("-C").Arg(tmpDir).FailOnExitCode().FailOnTimeout().Timeout(time.Minute).Run()
+	tst.AssertNoErr(t, err)
+
+	err = GenerateCharsetIDSpecs(tmpDir, tmpDir+"/csid_gen.go", CSIDGenOptions{DebugOutput: langext.PTrue})
+	tst.AssertNoErr(t, err)
+
+	err = GenerateCharsetIDSpecs(tmpDir, tmpDir+"/csid_gen.go", CSIDGenOptions{DebugOutput: langext.PTrue})
+	tst.AssertNoErr(t, err)
+
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+	fmt.Println("=====================================================================================================")
+	fmt.Println(string(tst.Must(os.ReadFile(tmpDir + "/csid_gen.go"))(t)))
+	fmt.Println("=====================================================================================================")
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+}

bfcodegen/enum-generate.go

@@ -0,0 +1,373 @@
+package bfcodegen
+
+import (
+	"bytes"
+	_ "embed"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cryptext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/rext"
+	"go/format"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"reflect"
+	"regexp"
+	"strings"
+	"text/template"
+)
+
+type EnumDefVal struct {
+	VarName     string
+	Value       string
+	Description *string
+	Data        *map[string]any
+	RawComment  *string
+}
+
+type EnumDef struct {
+	File         string
+	FileRelative string
+	EnumTypeName string
+	Type         string
+	Values       []EnumDefVal
+}
+
+type EnumGenOptions struct {
+	DebugOutput *bool
+	GoFormat    *bool
+}
+
+var rexEnumPackage = rext.W(regexp.MustCompile(`^package\s+(?P<name>[A-Za-z0-9_]+)\s*$`))
+
+var rexEnumDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s+(?P<type>[A-Za-z0-9_]+)\s*//\s*(@enum:type).*$`))
+
+var rexEnumValueDef = rext.W(regexp.MustCompile(`^\s*(?P<name>[A-Za-z0-9_]+)\s+(?P<type>[A-Za-z0-9_]+)\s*=\s*(?P<value>("[/@A-Za-z0-9_:\s\-.]*"|[0-9]+))\s*(//(?P<comm>.*))?.*$`))
+
+var rexEnumChecksumConst = rext.W(regexp.MustCompile(`const ChecksumEnumGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
+
+//go:embed enum-generate.template
+var templateEnumGenerateText string
+
+func GenerateEnumSpecs(sourceDir string, destFile string, opt EnumGenOptions) error {
+
+	oldChecksum := "N/A"
+	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		if m, ok := rexEnumChecksumConst.MatchFirst(string(content)); ok {
+			oldChecksum = m.GroupByName("cs").Value()
+		}
+	}
+
+	gocode, _, changed, err := _generateEnumSpecs(sourceDir, destFile, oldChecksum, langext.Coalesce(opt.GoFormat, true), langext.Coalesce(opt.DebugOutput, false))
+	if err != nil {
+		return err
+	}
+
+	if !changed {
+		return nil
+	}
+
+	err = os.WriteFile(destFile, []byte(gocode), 0o755)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func _generateEnumSpecs(sourceDir string, destFile string, oldChecksum string, gofmt bool, debugOutput bool) (string, string, bool, error) {
+
+	files, err := os.ReadDir(sourceDir)
+	if err != nil {
+		return "", "", false, err
+	}
+
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return v.Name() != path.Base(destFile) })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return strings.HasSuffix(v.Name(), ".go") })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return !strings.HasSuffix(v.Name(), "_gen.go") })
+	langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
+
+	newChecksumStr := goext.GoextVersion
+	for _, f := range files {
+		content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
+		if err != nil {
+			return "", "", false, err
+		}
+		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
+	}
+
+	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
+
+	if newChecksum != oldChecksum {
+		fmt.Printf("[EnumGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+	} else {
+		fmt.Printf("[EnumGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
+		return "", oldChecksum, false, nil
+	}
+
+	allEnums := make([]EnumDef, 0)
+
+	pkgname := ""
+
+	for _, f := range files {
+		if debugOutput {
+			fmt.Printf("========= %s =========\n\n", f.Name())
+		}
+
+		fileEnums, pn, err := processEnumFile(sourceDir, path.Join(sourceDir, f.Name()), debugOutput)
+		if err != nil {
+			return "", "", false, err
+		}
+
+		if debugOutput {
+			fmt.Printf("\n")
+		}
+
+		allEnums = append(allEnums, fileEnums...)
+
+		if pn != "" {
+			pkgname = pn
+		}
+	}
+
+	if pkgname == "" {
+		return "", "", false, errors.New("no package name found in any file")
+	}
+
+	rdata := fmtEnumOutput(newChecksum, allEnums, pkgname)
+
+	if !gofmt {
+		return rdata, newChecksum, true, nil
+	}
+
+	fdata, err := format.Source([]byte(rdata))
+	if err != nil {
+		return "", "", false, err
+	}
+
+	return string(fdata), newChecksum, true, nil
+}
+
+func processEnumFile(basedir string, fn string, debugOutput bool) ([]EnumDef, string, error) {
+	file, err := os.Open(fn)
+	if err != nil {
+		return nil, "", err
+	}
+
+	defer func() { _ = file.Close() }()
+
+	bin, err := io.ReadAll(file)
+	if err != nil {
+		return nil, "", err
+	}
+
+	lines := strings.Split(string(bin), "\n")
+
+	enums := make([]EnumDef, 0)
+
+	pkgname := ""
+
+	for i, line := range lines {
+		if i == 0 && strings.HasPrefix(line, "// Code generated by") {
+			break
+		}
+
+		if match, ok := rexEnumPackage.MatchFirst(line); i == 0 && ok {
+			pkgname = match.GroupByName("name").Value()
+			continue
+		}
+
+		if match, ok := rexEnumDef.MatchFirst(line); ok {
+
+			rfp, err := filepath.Rel(basedir, fn)
+			if err != nil {
+				return nil, "", err
+			}
+
+			def := EnumDef{
+				File:         fn,
+				FileRelative: rfp,
+				EnumTypeName: match.GroupByName("name").Value(),
+				Type:         match.GroupByName("type").Value(),
+				Values:       make([]EnumDefVal, 0),
+			}
+			enums = append(enums, def)
+
+			if debugOutput {
+				fmt.Printf("Found enum definition { '%s' -> '%s' }\n", def.EnumTypeName, def.Type)
+			}
+		}
+
+		if match, ok := rexEnumValueDef.MatchFirst(line); ok {
+			typename := match.GroupByName("type").Value()
+
+			comment := match.GroupByNameOrEmpty("comm").ValueOrNil()
+			var descr *string = nil
+			var data *map[string]any = nil
+			if comment != nil {
+				comment = langext.Ptr(strings.TrimSpace(*comment))
+				if strings.HasPrefix(*comment, "{") {
+					if v, ok := tryParseDataComment(*comment); ok {
+						data = &v
+						if anyDataDescr, ok := v["description"]; ok {
+							if dataDescr, ok := anyDataDescr.(string); ok {
+								descr = &dataDescr
+							}
+						}
+					} else {
+						descr = comment
+					}
+				} else {
+					descr = comment
+				}
+			}
+
+			def := EnumDefVal{
+				VarName:     match.GroupByName("name").Value(),
+				Value:       match.GroupByName("value").Value(),
+				RawComment:  comment,
+				Description: descr,
+				Data:        data,
+			}
+
+			found := false
+			for i, v := range enums {
+				if v.EnumTypeName == typename {
+					enums[i].Values = append(enums[i].Values, def)
+					found = true
+
+					if debugOutput {
+						if def.Description != nil {
+							fmt.Printf("Found enum value [%s] for '%s'  ('%s')\n", def.Value, def.VarName, *def.Description)
+						} else {
+							fmt.Printf("Found enum value [%s] for '%s'\n", def.Value, def.VarName)
+						}
+					}
+					break
+				}
+			}
+			if !found {
+				if debugOutput {
+					fmt.Printf("Found non-enum value [%s] for '%s' ( looks like enum value, but no matching @enum:type )\n", def.Value, def.VarName)
+				}
+			}
+		}
+	}
+
+	return enums, pkgname, nil
+}
+
+func tryParseDataComment(s string) (map[string]any, bool) {
+
+	r := make(map[string]any)
+
+	err := json.Unmarshal([]byte(s), &r)
+	if err != nil {
+		return nil, false
+	}
+
+	for _, v := range r {
+
+		rv := reflect.ValueOf(v)
+
+		if rv.Kind() == reflect.Ptr && rv.IsNil() {
+			continue
+		}
+		if rv.Kind() == reflect.Bool {
+			continue
+		}
+		if rv.Kind() == reflect.String {
+			continue
+		}
+		if rv.Kind() == reflect.Int64 {
+			continue
+		}
+		if rv.Kind() == reflect.Float64 {
+			continue
+		}
+
+		return nil, false
+	}
+
+	return r, true
+}
+
+func fmtEnumOutput(cs string, enums []EnumDef, pkgname string) string {
+
+	templ := template.New("enum-generate")
+
+	templ = templ.Funcs(template.FuncMap{
+		"boolToStr": func(b bool) string { return langext.Conditional(b, "true", "false") },
+		"deref":     func(v *string) string { return *v },
+		"trimSpace": func(str string) string { return strings.TrimSpace(str) },
+		"hasStr":    func(v EnumDef) bool { return v.Type == "string" },
+		"hasDescr": func(v EnumDef) bool {
+			return langext.ArrAll(v.Values, func(val EnumDefVal) bool { return val.Description != nil })
+		},
+		"hasData": func(v EnumDef) bool {
+			return len(v.Values) > 0 && langext.ArrAll(v.Values, func(val EnumDefVal) bool { return val.Data != nil })
+		},
+		"gostr": func(v any) string {
+			return fmt.Sprintf("%#+v", v)
+		},
+		"goobj": func(name string, v any) string {
+			return fmt.Sprintf("%#+v", v)
+		},
+		"godatakey": func(v string) string {
+			return strings.ToUpper(v[0:1]) + v[1:]
+		},
+		"godatavalue": func(v any) string {
+			return fmt.Sprintf("%#+v", v)
+		},
+		"godatatype": func(v any) string {
+			return fmt.Sprintf("%T", v)
+		},
+		"mapindex": func(v map[string]any, k string) any {
+			return v[k]
+		},
+		"generalDataKeys": func(v EnumDef) map[string]string {
+			r0 := make(map[string]int)
+
+			for _, eval := range v.Values {
+				for k := range *eval.Data {
+					if ctr, ok := r0[k]; ok {
+						r0[k] = ctr + 1
+					} else {
+						r0[k] = 1
+					}
+				}
+			}
+
+			r1 := langext.MapToArr(r0)
+			r2 := langext.ArrFilter(r1, func(p langext.MapEntry[string, int]) bool { return p.Value == len(v.Values) })
+			r3 := langext.ArrMap(r2, func(p langext.MapEntry[string, int]) string { return p.Key })
+			r4 := langext.ArrToKVMap(r3, func(p string) string { return p }, func(p string) string { return fmt.Sprintf("%T", (*v.Values[0].Data)[p]) })
+
+			return r4
+		},
+	})
+
+	templ = template.Must(templ.Parse(templateEnumGenerateText))
+
+	buffer := bytes.Buffer{}
+
+	err := templ.Execute(&buffer, langext.H{
+		"PkgName":      pkgname,
+		"Checksum":     cs,
+		"GoextVersion": goext.GoextVersion,
+		"Enums":        enums,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	return buffer.String()
+}

bfcodegen/enum-generate.template

@@ -0,0 +1,177 @@
+// Code generated by enum-generate.go DO NOT EDIT.
+
+package {{.PkgName}}
+
+import "git.blackforestbytes.com/BlackForestBytes/goext/langext"
+import "git.blackforestbytes.com/BlackForestBytes/goext/enums"
+
+const ChecksumEnumGenerator = "{{.Checksum}}" // GoExtVersion: {{.GoextVersion}}
+
+{{ $pkgname  := .PkgName }}
+
+{{range .Enums}}
+
+{{ $hasStr   := ( . | hasStr   ) }}
+{{ $hasDescr := ( . | hasDescr ) }}
+{{ $hasData  := ( . | hasData  ) }}
+
+// ================================ {{.EnumTypeName}} ================================
+//
+// File:       {{.FileRelative}}
+// StringEnum: {{$hasStr   | boolToStr}}
+// DescrEnum:  {{$hasDescr | boolToStr}}
+// DataEnum:   {{$hasData  | boolToStr}}
+//
+
+{{ $typename := .EnumTypeName }}
+{{ $enumdef  := . }}
+
+var __{{.EnumTypeName}}Values = []{{.EnumTypeName}}{ {{range .Values}}
+	{{.VarName}}, {{end}}
+}
+
+{{if $hasDescr}}
+var __{{.EnumTypeName}}Descriptions = map[{{.EnumTypeName}}]string{ {{range .Values}}
+	{{.VarName}}: {{.Description | deref | trimSpace | gostr}}, {{end}}
+}
+{{end}}
+
+{{if $hasData}}
+type {{ .EnumTypeName }}Data struct { {{ range $datakey, $datatype := ($enumdef | generalDataKeys)  }}
+    {{ $datakey | godatakey }} {{ $datatype }} `json:"{{ $datakey }}"` {{ end }}
+}
+
+var __{{.EnumTypeName}}Data = map[{{.EnumTypeName}}]{{.EnumTypeName}}Data{ {{range .Values}} {{ $enumvalue := . }}
+	{{.VarName}}: {{ $typename }}Data{ {{ range $datakey, $datatype := $enumdef | generalDataKeys  }}
+	    {{ $datakey | godatakey }}: {{ (mapindex $enumvalue.Data $datakey) | godatavalue }}, {{ end }}
+	}, {{end}}
+}
+{{end}}
+
+var __{{.EnumTypeName}}Varnames = map[{{.EnumTypeName}}]string{ {{range .Values}}
+	{{.VarName}}: "{{.VarName}}", {{end}}
+}
+
+func (e {{.EnumTypeName}}) Valid() bool {
+	return langext.InArray(e, __{{.EnumTypeName}}Values)
+}
+
+func (e {{.EnumTypeName}}) Values() []{{.EnumTypeName}} {
+	return __{{.EnumTypeName}}Values
+}
+
+func (e {{.EnumTypeName}}) ValuesAny() []any {
+	return langext.ArrCastToAny(__{{.EnumTypeName}}Values)
+}
+
+func (e {{.EnumTypeName}}) ValuesMeta() []enums.EnumMetaValue {
+	return {{.EnumTypeName}}ValuesMeta()
+}
+
+{{if $hasStr}}
+func (e {{.EnumTypeName}}) String() string {
+	return string(e)
+}
+{{end}}
+
+{{if $hasDescr}}
+func (e {{.EnumTypeName}}) Description() string {
+	if d, ok := __{{.EnumTypeName}}Descriptions[e]; ok {
+		return d
+	}
+	return ""
+}
+{{end}}
+
+{{if $hasData}}
+func (e {{.EnumTypeName}}) Data() {{.EnumTypeName}}Data {
+	if d, ok := __{{.EnumTypeName}}Data[e]; ok {
+		return d
+	}
+	return {{.EnumTypeName}}Data{}
+}
+{{end}}
+
+func (e {{.EnumTypeName}}) VarName() string {
+	if d, ok := __{{.EnumTypeName}}Varnames[e]; ok {
+		return d
+	}
+	return ""
+}
+
+func (e {{.EnumTypeName}}) TypeName() string {
+	return "{{$typename}}"
+}
+
+func (e {{.EnumTypeName}}) PackageName() string {
+	return "{{$pkgname }}"
+}
+
+func (e {{.EnumTypeName}}) Meta() enums.EnumMetaValue {
+    {{if $hasDescr}} return enums.EnumMetaValue{VarName: e.VarName(), Value: e, Description: langext.Ptr(e.Description())} {{else}} return enums.EnumMetaValue{VarName: e.VarName(), Value: e, Description: nil} {{end}}
+}
+
+{{if $hasDescr}}
+func (e {{.EnumTypeName}}) DescriptionMeta() enums.EnumDescriptionMetaValue {
+    return enums.EnumDescriptionMetaValue{VarName: e.VarName(), Value: e, Description: e.Description()}
+}
+{{end}}
+
+{{if $hasData}}
+func (e {{.EnumTypeName}}) DataMeta() enums.EnumDataMetaValue {
+    return enums.EnumDataMetaValue{
+        VarName: e.VarName(),
+        Value: e,
+        {{if $hasDescr}} Description: langext.Ptr(e.Description()), {{else}} Description: nil, {{end}}
+        Data: map[string]any{
+            {{ range $datakey, $datatype := $enumdef | generalDataKeys  }} "{{ $datakey }}": e.Data().{{ $datakey | godatakey }},
+            {{ end }}
+        },
+    }
+}
+{{end}}
+
+func Parse{{.EnumTypeName}}(vv string) ({{.EnumTypeName}}, bool) {
+	for _, ev := range __{{.EnumTypeName}}Values {
+		if string(ev) == vv {
+			return ev, true
+		}
+	}
+	return "", false
+}
+
+func {{.EnumTypeName}}Values() []{{.EnumTypeName}} {
+	return __{{.EnumTypeName}}Values
+}
+
+func {{.EnumTypeName}}ValuesMeta() []enums.EnumMetaValue {
+	return []enums.EnumMetaValue{ {{range .Values}}
+            {{.VarName}}.Meta(), {{end}}
+	}
+}
+
+{{if $hasData}}
+func {{.EnumTypeName}}ValuesDataMeta() []enums.EnumDataMetaValue {
+	return []enums.EnumDataMetaValue{ {{range .Values}}
+            {{.VarName}}.DataMeta(), {{end}}
+	}
+}
+{{end}}
+
+{{if $hasDescr}}
+func {{.EnumTypeName}}ValuesDescriptionMeta() []enums.EnumDescriptionMetaValue {
+	return []enums.EnumDescriptionMetaValue{ {{range .Values}}
+            {{.VarName}}.DescriptionMeta(), {{end}}
+	}
+}
+{{end}}
+
+{{end}}
+
+// ================================ ================= ================================
+
+func AllPackageEnums() []enums.Enum {
+    return []enums.Enum{ {{range .Enums}}
+        {{ if gt (len .Values) 0 }} {{  $v := index .Values 0 }} {{ $v.VarName}}, {{end}} // {{ .EnumTypeName }} {{end}}
+    }
+}

bfcodegen/enum-generate_test.go

@@ -0,0 +1,91 @@
+package bfcodegen
+
+import (
+	_ "embed"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cmdext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+//go:embed _test_example_1.tgz
+var EnumExampleModels1 []byte
+
+//go:embed _test_example_2.tgz
+var EnumExampleModels2 []byte
+
+func TestGenerateEnumSpecs(t *testing.T) {
+
+	tmpFile := filepath.Join(t.TempDir(), langext.MustHexUUID()+".tgz")
+
+	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
+
+	err := os.WriteFile(tmpFile, EnumExampleModels1, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.Remove(tmpFile) })
+
+	err = os.Mkdir(tmpDir, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.RemoveAll(tmpFile) })
+
+	_, err = cmdext.Runner("tar").Arg("-xvzf").Arg(tmpFile).Arg("-C").Arg(tmpDir).FailOnExitCode().FailOnTimeout().Timeout(time.Minute).Run()
+	tst.AssertNoErr(t, err)
+
+	s1, cs1, _, err := _generateEnumSpecs(tmpDir, "", "N/A", true, true)
+	tst.AssertNoErr(t, err)
+
+	s2, cs2, _, err := _generateEnumSpecs(tmpDir, "", "N/A", true, true)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertEqual(t, cs1, cs2)
+	tst.AssertEqual(t, s1, s2)
+
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+	fmt.Println("=====================================================================================================")
+	fmt.Println(s1)
+	fmt.Println("=====================================================================================================")
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+}
+
+func TestGenerateEnumSpecsData(t *testing.T) {
+
+	tmpFile := filepath.Join(t.TempDir(), langext.MustHexUUID()+".tgz")
+
+	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
+
+	err := os.WriteFile(tmpFile, EnumExampleModels2, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.Remove(tmpFile) })
+
+	err = os.Mkdir(tmpDir, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.RemoveAll(tmpFile) })
+
+	_, err = cmdext.Runner("tar").Arg("-xvzf").Arg(tmpFile).Arg("-C").Arg(tmpDir).FailOnExitCode().FailOnTimeout().Timeout(time.Minute).Run()
+	tst.AssertNoErr(t, err)
+
+	s1, _, _, err := _generateEnumSpecs(tmpDir, "", "", true, true)
+	tst.AssertNoErr(t, err)
+
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+	fmt.Println("=====================================================================================================")
+	fmt.Println(s1)
+	fmt.Println("=====================================================================================================")
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+}

bfcodegen/id-generate.go

@@ -0,0 +1,198 @@
+package bfcodegen
+
+import (
+	"bytes"
+	_ "embed"
+	"errors"
+	"fmt"
+	"go/format"
+	"git.blackforestbytes.com/BlackForestBytes/goext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cryptext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/rext"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"text/template"
+)
+
+type IDDef struct {
+	File         string
+	FileRelative string
+	Name         string
+}
+
+type IDGenOptions struct {
+	DebugOutput *bool
+}
+
+var rexIDPackage = rext.W(regexp.MustCompile(`^package\s+(?P<name>[A-Za-z0-9_]+)\s*$`))
+
+var rexIDDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s+string\s*//\s*(@id:type).*$`))
+
+var rexIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumIDGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
+
+//go:embed id-generate.template
+var templateIDGenerateText string
+
+func GenerateIDSpecs(sourceDir string, destFile string, opt IDGenOptions) error {
+
+	debugOutput := langext.Coalesce(opt.DebugOutput, false)
+
+	files, err := os.ReadDir(sourceDir)
+	if err != nil {
+		return err
+	}
+
+	oldChecksum := "N/A"
+	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
+		content, err := os.ReadFile(destFile)
+		if err != nil {
+			return err
+		}
+		if m, ok := rexIDChecksumConst.MatchFirst(string(content)); ok {
+			oldChecksum = m.GroupByName("cs").Value()
+		}
+	}
+
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return v.Name() != path.Base(destFile) })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return strings.HasSuffix(v.Name(), ".go") })
+	files = langext.ArrFilter(files, func(v os.DirEntry) bool { return !strings.HasSuffix(v.Name(), "_gen.go") })
+	langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
+
+	newChecksumStr := goext.GoextVersion
+	for _, f := range files {
+		content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
+		if err != nil {
+			return err
+		}
+		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
+	}
+
+	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
+
+	if newChecksum != oldChecksum {
+		fmt.Printf("[IDGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+	} else {
+		fmt.Printf("[IDGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
+		return nil
+	}
+
+	allIDs := make([]IDDef, 0)
+
+	pkgname := ""
+
+	for _, f := range files {
+		if debugOutput {
+			fmt.Printf("========= %s =========\n\n", f.Name())
+		}
+
+		fileIDs, pn, err := processIDFile(sourceDir, path.Join(sourceDir, f.Name()), debugOutput)
+		if err != nil {
+			return err
+		}
+
+		if debugOutput {
+			fmt.Printf("\n")
+		}
+
+		allIDs = append(allIDs, fileIDs...)
+
+		if pn != "" {
+			pkgname = pn
+		}
+	}
+
+	if pkgname == "" {
+		return errors.New("no package name found in any file")
+	}
+
+	fdata, err := format.Source([]byte(fmtIDOutput(newChecksum, allIDs, pkgname)))
+	if err != nil {
+		return err
+	}
+
+	err = os.WriteFile(destFile, fdata, 0o755)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func processIDFile(basedir string, fn string, debugOutput bool) ([]IDDef, string, error) {
+	file, err := os.Open(fn)
+	if err != nil {
+		return nil, "", err
+	}
+
+	defer func() { _ = file.Close() }()
+
+	bin, err := io.ReadAll(file)
+	if err != nil {
+		return nil, "", err
+	}
+
+	lines := strings.Split(string(bin), "\n")
+
+	ids := make([]IDDef, 0)
+
+	pkgname := ""
+
+	for i, line := range lines {
+		if i == 0 && strings.HasPrefix(line, "// Code generated by") {
+			break
+		}
+
+		if match, ok := rexIDPackage.MatchFirst(line); i == 0 && ok {
+			pkgname = match.GroupByName("name").Value()
+			continue
+		}
+
+		if match, ok := rexIDDef.MatchFirst(line); ok {
+
+			rfp, err := filepath.Rel(basedir, fn)
+			if err != nil {
+				return nil, "", err
+			}
+
+			def := IDDef{
+				File:         fn,
+				FileRelative: rfp,
+				Name:         match.GroupByName("name").Value(),
+			}
+
+			if debugOutput {
+				fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+			}
+
+			ids = append(ids, def)
+		}
+	}
+
+	return ids, pkgname, nil
+}
+
+func fmtIDOutput(cs string, ids []IDDef, pkgname string) string {
+	templ := template.Must(template.New("id-generate").Parse(templateIDGenerateText))
+
+	buffer := bytes.Buffer{}
+
+	anyDef := langext.ArrFirstOrNil(ids, func(def IDDef) bool { return def.Name == "AnyID" || def.Name == "AnyId" })
+
+	err := templ.Execute(&buffer, langext.H{
+		"PkgName":      pkgname,
+		"Checksum":     cs,
+		"GoextVersion": goext.GoextVersion,
+		"IDs":          ids,
+		"AnyDef":       anyDef,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	return buffer.String()
+}

bfcodegen/id-generate.template

@@ -0,0 +1,56 @@
+// Code generated by id-generate.go DO NOT EDIT.
+
+package {{.PkgName}}
+
+import "go.mongodb.org/mongo-driver/bson"
+import "go.mongodb.org/mongo-driver/bson/bsontype"
+import "go.mongodb.org/mongo-driver/bson/primitive"
+import "git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+
+const ChecksumIDGenerator = "{{.Checksum}}" // GoExtVersion: {{.GoextVersion}}
+
+{{range .IDs}}
+
+// ================================ {{.Name}} ({{.FileRelative}}) ================================
+
+func (i {{.Name}}) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	if objId, err := primitive.ObjectIDFromHex(string(i)); err == nil {
+		return bson.MarshalValue(objId)
+	} else {
+		return 0, nil, exerr.New(exerr.TypeMarshalEntityID, "Failed to marshal {{.Name}}("+i.String()+") to ObjectId").Str("value", string(i)).Type("type", i).Build()
+	}
+}
+
+func (i {{.Name}}) String() string {
+	return string(i)
+}
+
+func (i {{.Name}}) ObjID() (primitive.ObjectID, error) {
+	return primitive.ObjectIDFromHex(string(i))
+}
+
+func (i {{.Name}}) Valid() bool {
+	_, err := primitive.ObjectIDFromHex(string(i))
+	return err == nil
+}
+
+{{if ne $.AnyDef nil}}
+func (i {{.Name}}) AsAny() {{$.AnyDef.Name}} {
+	return {{$.AnyDef.Name}}(i)
+}
+
+func (i {{.Name}}) AsAnyPtr() *{{$.AnyDef.Name}} {
+    v := {{$.AnyDef.Name}}(i)
+	return &v
+}
+{{end}}
+
+func (i {{.Name}}) IsZero() bool {
+	return i == ""
+}
+
+func New{{.Name}}() {{.Name}} {
+	return {{.Name}}(primitive.NewObjectID().Hex())
+}
+
+{{end}}

bfcodegen/id-generate_test.go

@@ -0,0 +1,52 @@
+package bfcodegen
+
+import (
+	_ "embed"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/cmdext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+//go:embed _test_example_1.tgz
+var IDExampleModels1 []byte
+
+func TestGenerateIDSpecs(t *testing.T) {
+
+	tmpFile := filepath.Join(t.TempDir(), langext.MustHexUUID()+".tgz")
+
+	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
+
+	err := os.WriteFile(tmpFile, IDExampleModels1, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.Remove(tmpFile) })
+
+	err = os.Mkdir(tmpDir, 0o777)
+	tst.AssertNoErr(t, err)
+
+	t.Cleanup(func() { _ = os.RemoveAll(tmpFile) })
+
+	_, err = cmdext.Runner("tar").Arg("-xvzf").Arg(tmpFile).Arg("-C").Arg(tmpDir).FailOnExitCode().FailOnTimeout().Timeout(time.Minute).Run()
+	tst.AssertNoErr(t, err)
+
+	err = GenerateIDSpecs(tmpDir, tmpDir+"/id_gen.go", IDGenOptions{DebugOutput: langext.PTrue})
+	tst.AssertNoErr(t, err)
+
+	err = GenerateIDSpecs(tmpDir, tmpDir+"/id_gen.go", IDGenOptions{DebugOutput: langext.PTrue})
+	tst.AssertNoErr(t, err)
+
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+	fmt.Println("=====================================================================================================")
+	fmt.Println(string(tst.Must(os.ReadFile(tmpDir + "/id_gen.go"))(t)))
+	fmt.Println("=====================================================================================================")
+	fmt.Println()
+	fmt.Println()
+	fmt.Println()
+}

cmdext/builder.go

@@ -2,7 +2,7 @@ package cmdext
 
 import (
 	"fmt"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
 	"time"
 )
 
@@ -14,6 +14,7 @@ type CommandRunner struct {
 	listener         []CommandListener
 	enforceExitCodes *[]int
 	enforceNoTimeout bool
+	enforceNoStderr  bool
 }
 
 func Runner(program string) *CommandRunner {
@@ -25,6 +26,7 @@ func Runner(program string) *CommandRunner {
 		listener:         make([]CommandListener, 0),
 		enforceExitCodes: nil,
 		enforceNoTimeout: false,
+		enforceNoStderr:  false,
 	}
 }
 
@@ -73,6 +75,11 @@ func (r *CommandRunner) FailOnTimeout() *CommandRunner {
 	return r
 }
 
+func (r *CommandRunner) FailOnStderr() *CommandRunner {
+	r.enforceNoStderr = true
+	return r
+}
+
 func (r *CommandRunner) Listen(lstr CommandListener) *CommandRunner {
 	r.listener = append(r.listener, lstr)
 	return r

cmdext/cmdrunner.go

@@ -2,15 +2,16 @@ package cmdext
 
 import (
 	"errors"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
-	"gogs.mikescher.com/BlackForestBytes/goext/mathext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/mathext"
-	"gogs.mikescher.com/BlackForestBytes/goext/syncext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/syncext"
 	"os/exec"
 	"time"
 )
 
 var ErrExitCode = errors.New("process exited with an unexpected exitcode")
 var ErrTimeout = errors.New("process did not exit after the specified timeout")
+var ErrStderrPrint = errors.New("process did print to stderr stream")
 
 type CommandResult struct {
 	StdOut          string
@@ -53,12 +54,27 @@ func run(opt CommandRunner) (CommandResult, error) {
 		err         error
 	}
 
+	stderrFailChan := make(chan bool)
+
 	outputChan := make(chan resultObj)
 	go func() {
 		// we need to first fully read the pipes and then call Wait
 		// see https://pkg.go.dev/os/exec#Cmd.StdoutPipe
 
-		stdout, stderr, stdcombined, err := preader.Read(opt.listener)
+		listener := make([]CommandListener, 0)
+		listener = append(listener, opt.listener...)
+
+		if opt.enforceNoStderr {
+			listener = append(listener, genericCommandListener{
+				_readRawStderr: langext.Ptr(func(v []byte) {
+					if len(v) > 0 {
+						stderrFailChan <- true
+					}
+				}),
+			})
+		}
+
+		stdout, stderr, stdcombined, err := preader.Read(listener)
 		if err != nil {
 			outputChan <- resultObj{stdout, stderr, stdcombined, err}
 			_ = cmd.Process.Kill()
@@ -115,8 +131,34 @@ func run(opt CommandRunner) (CommandResult, error) {
 			return res, nil
 		}
 
+	case <-stderrFailChan:
+		_ = cmd.Process.Kill()
+
+		if fallback, ok := syncext.ReadChannelWithTimeout(outputChan, 32*time.Millisecond); ok {
+			// most of the time the cmd.Process.Kill() should also have finished the pipereader
+			// and we can at least return the already collected stdout, stderr, etc
+			res := CommandResult{
+				StdOut:          fallback.stdout,
+				StdErr:          fallback.stderr,
+				StdCombined:     fallback.stdcombined,
+				ExitCode:        -1,
+				CommandTimedOut: false,
+			}
+			return res, ErrStderrPrint
+		} else {
+			res := CommandResult{
+				StdOut:          "",
+				StdErr:          "",
+				StdCombined:     "",
+				ExitCode:        -1,
+				CommandTimedOut: false,
+			}
+			return res, ErrStderrPrint
+		}
+
 	case outobj := <-outputChan:
-		if exiterr, ok := outobj.err.(*exec.ExitError); ok {
+		var exiterr *exec.ExitError
+		if errors.As(outobj.err, &exiterr) {
 			excode := exiterr.ExitCode()
 			for _, lstr := range opt.listener {
 				lstr.Finished(excode)

cmdext/cmdrunner_test.go

@@ -1,6 +1,7 @@
 package cmdext
 
 import (
+	"errors"
 	"fmt"
 	"testing"
 	"time"
@@ -32,7 +33,7 @@ func TestStdout(t *testing.T) {
 
 func TestStderr(t *testing.T) {
 
-	res1, err := Runner("python").Arg("-c").Arg("import sys; print(\"error\", file=sys.stderr, end='')").Run()
+	res1, err := Runner("python3").Arg("-c").Arg("import sys; print(\"error\", file=sys.stderr, end='')").Run()
 	if err != nil {
 		t.Errorf("%v", err)
 	}
@@ -55,7 +56,7 @@ func TestStderr(t *testing.T) {
 }
 
 func TestStdcombined(t *testing.T) {
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"1\", file=sys.stderr, flush=True); time.sleep(0.1); print(\"2\", file=sys.stdout, flush=True); time.sleep(0.1); print(\"3\", file=sys.stderr, flush=True)").
 		Run()
@@ -81,7 +82,7 @@ func TestStdcombined(t *testing.T) {
 }
 
 func TestPartialRead(t *testing.T) {
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"first message\", flush=True); time.sleep(5); print(\"cant see me\", flush=True);").
 		Timeout(100 * time.Millisecond).
@@ -105,7 +106,7 @@ func TestPartialRead(t *testing.T) {
 }
 
 func TestPartialReadStderr(t *testing.T) {
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"first message\", file=sys.stderr, flush=True); time.sleep(5); print(\"cant see me\", file=sys.stderr, flush=True);").
 		Timeout(100 * time.Millisecond).
@@ -130,7 +131,7 @@ func TestPartialReadStderr(t *testing.T) {
 
 func TestReadUnflushedStdout(t *testing.T) {
 
-	res1, err := Runner("python").Arg("-c").Arg("import sys; print(\"message101\", file=sys.stdout, end='')").Run()
+	res1, err := Runner("python3").Arg("-c").Arg("import sys; print(\"message101\", file=sys.stdout, end='')").Run()
 	if err != nil {
 		t.Errorf("%v", err)
 	}
@@ -154,7 +155,7 @@ func TestReadUnflushedStdout(t *testing.T) {
 
 func TestReadUnflushedStderr(t *testing.T) {
 
-	res1, err := Runner("python").Arg("-c").Arg("import sys; print(\"message101\", file=sys.stderr, end='')").Run()
+	res1, err := Runner("python3").Arg("-c").Arg("import sys; print(\"message101\", file=sys.stderr, end='')").Run()
 	if err != nil {
 		t.Errorf("%v", err)
 	}
@@ -179,7 +180,7 @@ func TestReadUnflushedStderr(t *testing.T) {
 func TestPartialReadUnflushed(t *testing.T) {
 	t.SkipNow()
 
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"first message\", end=''); time.sleep(5); print(\"cant see me\", end='');").
 		Timeout(100 * time.Millisecond).
@@ -205,7 +206,7 @@ func TestPartialReadUnflushed(t *testing.T) {
 func TestPartialReadUnflushedStderr(t *testing.T) {
 	t.SkipNow()
 
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"first message\", file=sys.stderr, end=''); time.sleep(5); print(\"cant see me\", file=sys.stderr, end='');").
 		Timeout(100 * time.Millisecond).
@@ -230,7 +231,7 @@ func TestPartialReadUnflushedStderr(t *testing.T) {
 
 func TestListener(t *testing.T) {
 
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys;" +
 			"import time;" +
@@ -263,7 +264,7 @@ func TestListener(t *testing.T) {
 
 func TestLongStdout(t *testing.T) {
 
-	res1, err := Runner("python").
+	res1, err := Runner("python3").
 		Arg("-c").
 		Arg("import sys; import time; print(\"X\" * 125001 + \"\\n\"); print(\"Y\" * 125001 + \"\\n\"); print(\"Z\" * 125001 + \"\\n\");").
 		Timeout(5000 * time.Millisecond).
@@ -289,16 +290,40 @@ func TestLongStdout(t *testing.T) {
 func TestFailOnTimeout(t *testing.T) {
 
 	_, err := Runner("sleep").Arg("2").Timeout(200 * time.Millisecond).FailOnTimeout().Run()
-	if err != ErrTimeout {
+	if !errors.Is(err, ErrTimeout) {
 		t.Errorf("wrong err := %v", err)
 	}
 
 }
 
+func TestFailOnStderr(t *testing.T) {
+
+	res1, err := Runner("python3").Arg("-c").Arg("import sys; print(\"error\", file=sys.stderr, end='')").FailOnStderr().Run()
+	if err == nil {
+		t.Errorf("no err")
+	}
+	if res1.CommandTimedOut {
+		t.Errorf("Timeout")
+	}
+	if res1.ExitCode != -1 {
+		t.Errorf("res1.ExitCode == %v", res1.ExitCode)
+	}
+	if res1.StdErr != "error" {
+		t.Errorf("res1.StdErr == '%v'", res1.StdErr)
+	}
+	if res1.StdOut != "" {
+		t.Errorf("res1.StdOut == '%v'", res1.StdOut)
+	}
+	if res1.StdCombined != "error\n" {
+		t.Errorf("res1.StdCombined == '%v'", res1.StdCombined)
+	}
+
+}
+
 func TestFailOnExitcode(t *testing.T) {
 
 	_, err := Runner("false").Timeout(200 * time.Millisecond).FailOnExitCode().Run()
-	if err != ErrExitCode {
+	if !errors.Is(err, ErrExitCode) {
 		t.Errorf("wrong err := %v", err)
 	}
 

cmdext/pipereader.go

@@ -2,7 +2,7 @@ package cmdext
 
 import (
 	"bufio"
-	"gogs.mikescher.com/BlackForestBytes/goext/syncext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/syncext"
 	"io"
 	"sync"
 )
@@ -32,8 +32,8 @@ func (pr *pipeReader) Read(listener []CommandListener) (string, string, string,
 	stdout := ""
 	go func() {
 		buf := make([]byte, 128)
-		for true {
+		for {
-			n, out := pr.stdout.Read(buf)
+			n, err := pr.stdout.Read(buf)
 			if n > 0 {
 				txt := string(buf[:n])
 				stdout += txt
@@ -42,11 +42,11 @@ func (pr *pipeReader) Read(listener []CommandListener) (string, string, string,
 					lstr.ReadRawStdout(buf[:n])
 				}
 			}
-			if out == io.EOF {
+			if err == io.EOF {
 				break
 			}
-			if out != nil {
+			if err != nil {
-				errch <- out
+				errch <- err
 				break
 			}
 		}
@@ -61,7 +61,7 @@ func (pr *pipeReader) Read(listener []CommandListener) (string, string, string,
 	stderr := ""
 	go func() {
 		buf := make([]byte, 128)
-		for true {
+		for {
 			n, err := pr.stderr.Read(buf)
 
 			if n > 0 {

confext/confParser.go

@@ -3,11 +3,12 @@ package confext
 import (
 	"errors"
 	"fmt"
-	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/timeext"
 	"math/bits"
 	"os"
 	"reflect"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -40,12 +41,12 @@ func processEnvOverrides(rval reflect.Value, delim string, prefix string) error
 			continue
 		}
 
-		if rvfield.Kind() == reflect.Struct {
+		envkey, found := rsfield.Tag.Lookup("env")
+		if !found || envkey == "-" {
+			continue
+		}
 
-			envkey, found := rsfield.Tag.Lookup("env")
+		if rvfield.Kind() == reflect.Struct && rvfield.Type() != reflect.TypeOf(time.UnixMilli(0)) {
-			if !found || envkey == "-" {
-				continue
-			}
 
 			subPrefix := prefix
 			if envkey != "" {
@@ -56,10 +57,7 @@ func processEnvOverrides(rval reflect.Value, delim string, prefix string) error
 			if err != nil {
 				return err
 			}
-		}
 
-		envkey := rsfield.Tag.Get("env")
-		if envkey == "" || envkey == "-" {
 			continue
 		}
 
@@ -172,6 +170,20 @@ func parseEnvToValue(envval string, fullEnvKey string, rvtype reflect.Type) (ref
 
 		return envcvl, nil
 
+	} else if rvtype.ConvertibleTo(reflect.TypeOf(false)) {
+
+		if strings.TrimSpace(strings.ToLower(envval)) == "true" {
+			return reflect.ValueOf(true).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "false" {
+			return reflect.ValueOf(false).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "1" {
+			return reflect.ValueOf(true).Convert(rvtype), nil
+		} else if strings.TrimSpace(strings.ToLower(envval)) == "0" {
+			return reflect.ValueOf(false).Convert(rvtype), nil
+		} else {
+			return reflect.Value{}, errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to <%s, ,bool> (value := '%s')", rvtype.Name(), fullEnvKey, envval))
+		}
+
 	} else if rvtype.ConvertibleTo(reflect.TypeOf("")) {
 
 		envcvl := reflect.ValueOf(envval).Convert(rvtype)

confext/confParser_test.go

@@ -1,7 +1,8 @@
 package confext
 
 import (
-	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/timeext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
 	"testing"
 	"time"
 )
@@ -41,13 +42,13 @@ func TestApplyEnvOverridesNoop(t *testing.T) {
 
 	output := input
 
-	err := ApplyEnvOverrides(&output, ".")
+	err := ApplyEnvOverrides("", &output, ".")
 	if err != nil {
 		t.Errorf("%v", err)
 		t.FailNow()
 	}
 
-	assertEqual(t, input, output)
+	tst.AssertEqual(t, input, output)
 }
 
 func TestApplyEnvOverridesSimple(t *testing.T) {
@@ -67,6 +68,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 		V7 aliasstring   `env:"TEST_V7"`
 		V8 time.Duration `env:"TEST_V8"`
 		V9 time.Time     `env:"TEST_V9"`
+		VA bool          `env:"TEST_VA"`
 	}
 
 	data := testdata{
@@ -81,6 +83,7 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 		V7: "7",
 		V8: 9,
 		V9: time.Unix(1671102873, 0),
+		VA: false,
 	}
 
 	t.Setenv("TEST_V1", "846")
@@ -92,22 +95,24 @@ func TestApplyEnvOverridesSimple(t *testing.T) {
 	t.Setenv("TEST_V7", "AAAAAA")
 	t.Setenv("TEST_V8", "1min4s")
 	t.Setenv("TEST_V9", "2009-11-10T23:00:00Z")
+	t.Setenv("TEST_VA", "true")
 
-	err := ApplyEnvOverrides(&data, ".")
+	err := ApplyEnvOverrides("", &data, ".")
 	if err != nil {
 		t.Errorf("%v", err)
 		t.FailNow()
 	}
 
-	assertEqual(t, data.V1, 846)
+	tst.AssertEqual(t, data.V1, 846)
-	assertEqual(t, data.V2, "hello_world")
+	tst.AssertEqual(t, data.V2, "hello_world")
-	assertEqual(t, data.V3, 6)
+	tst.AssertEqual(t, data.V3, 6)
-	assertEqual(t, data.V4, 333)
+	tst.AssertEqual(t, data.V4, 333)
-	assertEqual(t, data.V5, -937)
+	tst.AssertEqual(t, data.V5, -937)
-	assertEqual(t, data.V6, 70)
+	tst.AssertEqual(t, data.V6, 70)
-	assertEqual(t, data.V7, "AAAAAA")
+	tst.AssertEqual(t, data.V7, "AAAAAA")
-	assertEqual(t, data.V8, time.Second*64)
+	tst.AssertEqual(t, data.V8, time.Second*64)
-	assertEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
+	tst.AssertEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
+	tst.AssertEqual(t, data.VA, true)
 }
 
 func TestApplyEnvOverridesRecursive(t *testing.T) {
@@ -182,35 +187,35 @@ func TestApplyEnvOverridesRecursive(t *testing.T) {
 	t.Setenv("SUB_V3", "33min")
 	t.Setenv("SUB_V4", "2044-01-01T00:00:00Z")
 
-	err := ApplyEnvOverrides(&data, "_")
+	err := ApplyEnvOverrides("", &data, "_")
 	if err != nil {
 		t.Errorf("%v", err)
 		t.FailNow()
 	}
 
-	assertEqual(t, data.V1, 999)
+	tst.AssertEqual(t, data.V1, 999)
-	assertEqual(t, data.VX, "2")
+	tst.AssertEqual(t, data.VX, "2")
-	assertEqual(t, data.V5, "no")
+	tst.AssertEqual(t, data.V5, "no")
-	assertEqual(t, data.Sub1.V1, 3)
+	tst.AssertEqual(t, data.Sub1.V1, 3)
-	assertEqual(t, data.Sub1.VX, "4")
+	tst.AssertEqual(t, data.Sub1.VX, "4")
-	assertEqual(t, data.Sub1.V2, "5")
+	tst.AssertEqual(t, data.Sub1.V2, "5")
-	assertEqual(t, data.Sub1.V8, time.Second*6)
+	tst.AssertEqual(t, data.Sub1.V8, time.Second*6)
-	assertEqual(t, data.Sub1.V9, time.Unix(947206861, 0).UTC())
+	tst.AssertEqual(t, data.Sub1.V9, time.Unix(947206861, 0).UTC())
-	assertEqual(t, data.Sub2.V1, 846)
+	tst.AssertEqual(t, data.Sub2.V1, 846)
-	assertEqual(t, data.Sub2.VX, "9")
+	tst.AssertEqual(t, data.Sub2.VX, "9")
-	assertEqual(t, data.Sub2.V2, "222_hello_world")
+	tst.AssertEqual(t, data.Sub2.V2, "222_hello_world")
-	assertEqual(t, data.Sub2.V8, time.Second*64)
+	tst.AssertEqual(t, data.Sub2.V8, time.Second*64)
-	assertEqual(t, data.Sub2.V9, time.Unix(1257894000, 0).UTC())
+	tst.AssertEqual(t, data.Sub2.V9, time.Unix(1257894000, 0).UTC())
-	assertEqual(t, data.Sub3.V1, 33846)
+	tst.AssertEqual(t, data.Sub3.V1, 33846)
-	assertEqual(t, data.Sub3.VX, "14")
+	tst.AssertEqual(t, data.Sub3.VX, "14")
-	assertEqual(t, data.Sub3.V2, "33_hello_world")
+	tst.AssertEqual(t, data.Sub3.V2, "33_hello_world")
-	assertEqual(t, data.Sub3.V8, time.Second*1984)
+	tst.AssertEqual(t, data.Sub3.V8, time.Second*1984)
-	assertEqual(t, data.Sub3.V9, time.Unix(2015276400, 0).UTC())
+	tst.AssertEqual(t, data.Sub3.V9, time.Unix(2015276400, 0).UTC())
-	assertEqual(t, data.Sub4.V1, 11)
+	tst.AssertEqual(t, data.Sub4.V1, 11)
-	assertEqual(t, data.Sub4.VX, "19")
+	tst.AssertEqual(t, data.Sub4.VX, "19")
-	assertEqual(t, data.Sub4.V2, "22")
+	tst.AssertEqual(t, data.Sub4.V2, "22")
-	assertEqual(t, data.Sub4.V8, time.Second*1980)
+	tst.AssertEqual(t, data.Sub4.V8, time.Second*1980)
-	assertEqual(t, data.Sub4.V9, time.Unix(2335219200, 0).UTC())
+	tst.AssertEqual(t, data.Sub4.V9, time.Unix(2335219200, 0).UTC())
 }
 
 func TestApplyEnvOverridesPointer(t *testing.T) {
@@ -244,21 +249,21 @@ func TestApplyEnvOverridesPointer(t *testing.T) {
 	t.Setenv("TEST_V8", "1min4s")
 	t.Setenv("TEST_V9", "2009-11-10T23:00:00Z")
 
-	err := ApplyEnvOverrides(&data, ".")
+	err := ApplyEnvOverrides("", &data, ".")
 	if err != nil {
 		t.Errorf("%v", err)
 		t.FailNow()
 	}
 
-	assertPtrEqual(t, data.V1, 846)
+	tst.AssertDeRefEqual(t, data.V1, 846)
-	assertPtrEqual(t, data.V2, "hello_world")
+	tst.AssertDeRefEqual(t, data.V2, "hello_world")
-	assertPtrEqual(t, data.V3, 6)
+	tst.AssertDeRefEqual(t, data.V3, 6)
-	assertPtrEqual(t, data.V4, 333)
+	tst.AssertDeRefEqual(t, data.V4, 333)
-	assertPtrEqual(t, data.V5, -937)
+	tst.AssertDeRefEqual(t, data.V5, -937)
-	assertPtrEqual(t, data.V6, 70)
+	tst.AssertDeRefEqual(t, data.V6, 70)
-	assertPtrEqual(t, data.V7, "AAAAAA")
+	tst.AssertDeRefEqual(t, data.V7, "AAAAAA")
-	assertPtrEqual(t, data.V8, time.Second*64)
+	tst.AssertDeRefEqual(t, data.V8, time.Second*64)
-	assertPtrEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
+	tst.AssertDeRefEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
 }
 
 func assertEqual[T comparable](t *testing.T, actual T, expected T) {

cryptext/aes_test.go

@@ -2,6 +2,7 @@ package cryptext
 
 import (
 	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
 	"testing"
 )
 
@@ -23,13 +24,13 @@ func TestEncryptAESSimple(t *testing.T) {
 		panic(err)
 	}
 
-	assertEqual(t, string(str1), string(str3))
+	tst.AssertEqual(t, string(str1), string(str3))
 
 	str4, err := EncryptAESSimple(pw, str3, 512)
 	if err != nil {
 		panic(err)
 	}
 
-	assertNotEqual(t, string(str2), string(str4))
+	tst.AssertNotEqual(t, string(str2), string(str4))
 
 }

cryptext/hash_test.go

@@ -1,31 +1,20 @@
 package cryptext
 
 import (
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
 	"testing"
 )
 
 func TestStrSha256(t *testing.T) {
-	assertEqual(t, StrSha256(""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
+	tst.AssertEqual(t, StrSha256(""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
-	assertEqual(t, StrSha256("0"), "5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9")
+	tst.AssertEqual(t, StrSha256("0"), "5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9")
-	assertEqual(t, StrSha256("80085"), "b3786e141d65638ad8a98173e26b5f6a53c927737b23ff31fb1843937250f44b")
+	tst.AssertEqual(t, StrSha256("80085"), "b3786e141d65638ad8a98173e26b5f6a53c927737b23ff31fb1843937250f44b")
-	assertEqual(t, StrSha256("Hello World"), "a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e")
+	tst.AssertEqual(t, StrSha256("Hello World"), "a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e")
 }
 
 func TestBytesSha256(t *testing.T) {
-	assertEqual(t, BytesSha256([]byte{}), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
+	tst.AssertEqual(t, BytesSha256([]byte{}), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
-	assertEqual(t, BytesSha256([]byte{0}), "6e340b9cffb37a989ca544e6bb780a2c78901d3fb33738768511a30617afa01d")
+	tst.AssertEqual(t, BytesSha256([]byte{0}), "6e340b9cffb37a989ca544e6bb780a2c78901d3fb33738768511a30617afa01d")
-	assertEqual(t, BytesSha256([]byte{128}), "76be8b528d0075f7aae98d6fa57a6d3c83ae480a8469e668d7b0af968995ac71")
+	tst.AssertEqual(t, BytesSha256([]byte{128}), "76be8b528d0075f7aae98d6fa57a6d3c83ae480a8469e668d7b0af968995ac71")
-	assertEqual(t, BytesSha256([]byte{0, 1, 2, 4, 8, 16, 32, 64, 128, 255}), "55016a318ba538e00123c736b2a8b6db368d00e7e25727547655b653e5853603")
+	tst.AssertEqual(t, BytesSha256([]byte{0, 1, 2, 4, 8, 16, 32, 64, 128, 255}), "55016a318ba538e00123c736b2a8b6db368d00e7e25727547655b653e5853603")
-}
-
-func assertEqual(t *testing.T, actual string, expected string) {
-	if actual != expected {
-		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual, expected)
-	}
-}
-
-func assertNotEqual(t *testing.T, actual string, expected string) {
-	if actual == expected {
-		t.Errorf("values do not differ: Actual: '%v', Expected: '%v'", actual, expected)
-	}
 }

cryptext/passHash.go

@@ -3,25 +3,29 @@ package cryptext
 import (
 	"crypto/rand"
 	"crypto/sha256"
+	"crypto/sha512"
 	"encoding/base64"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
-	"gogs.mikescher.com/BlackForestBytes/goext/totpext"
-	"golang.org/x/crypto/bcrypt"
 	"strconv"
 	"strings"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/totpext"
+	"golang.org/x/crypto/bcrypt"
 )
 
-const LatestPassHashVersion = 4
+const LatestPassHashVersion = 5
 
 // PassHash
-// - [v0]: plaintext password ( `0|...` )
+// - [v0]: plaintext password ( `0|...` )                  // simple, used to write PW's directly in DB
-// - [v1]: sha256(plaintext)
+// - [v1]: sha256(plaintext)                               // simple hashing
-// - [v2]: seed | sha256<seed>(plaintext)
+// - [v2]: seed | sha256<seed>(plaintext)                  // add seed
-// - [v3]: seed | sha256<seed>(plaintext) | [hex(totp)]
+// - [v3]: seed | sha256<seed>(plaintext) | [hex(totp)]    // add TOTP support
-// - [v4]: bcrypt(plaintext) | [hex(totp)]
+// - [v4]: bcrypt(plaintext) | [hex(totp)]                 // use proper bcrypt
+// - [v5]: bcrypt(sha512(plaintext)) | [hex(totp)]         // hash pw before bcrypt (otherwise max pw-len = 72)
 type PassHash string
 
 func (ph PassHash) Valid() bool {
@@ -64,7 +68,6 @@ func (ph PassHash) Data() (_version int, _seed []byte, _payload []byte, _totp bo
 		return int(version), nil, payload, false, nil, true
 	}
 
-	//
 	if version == 2 {
 		if len(split) != 3 {
 			return -1, nil, nil, false, nil, false
@@ -109,7 +112,21 @@ func (ph PassHash) Data() (_version int, _seed []byte, _payload []byte, _totp bo
 		totp := false
 		totpsecret := make([]byte, 0)
 		if split[2] != "0" {
-			totpsecret, err = hex.DecodeString(split[3])
+			totpsecret, err = hex.DecodeString(split[2])
+			totp = true
+		}
+		return int(version), nil, payload, totp, totpsecret, true
+	}
+
+	if version == 5 {
+		if len(split) != 3 {
+			return -1, nil, nil, false, nil, false
+		}
+		payload := []byte(split[1])
+		totp := false
+		totpsecret := make([]byte, 0)
+		if split[2] != "0" {
+			totpsecret, err = hex.DecodeString(split[2])
 			totp = true
 		}
 		return int(version), nil, payload, totp, totpsecret, true
@@ -156,6 +173,14 @@ func (ph PassHash) Verify(plainpass string, totp *string) bool {
 		}
 	}
 
+	if version == 5 {
+		if !hastotp {
+			return bcrypt.CompareHashAndPassword(payload, hash512(plainpass)) == nil
+		} else {
+			return bcrypt.CompareHashAndPassword(payload, hash512(plainpass)) == nil && totpext.Validate(totpsecret, *totp)
+		}
+	}
+
 	return false
 }
 
@@ -209,6 +234,12 @@ func (ph PassHash) ClearTOTP() (PassHash, error) {
 		return PassHash(strings.Join(split, "|")), nil
 	}
 
+	if version == 5 {
+		split := strings.Split(string(ph), "|")
+		split[2] = "0"
+		return PassHash(strings.Join(split, "|")), nil
+	}
+
 	return "", errors.New("unknown version")
 }
 
@@ -242,6 +273,12 @@ func (ph PassHash) WithTOTP(totpSecret []byte) (PassHash, error) {
 		return PassHash(strings.Join(split, "|")), nil
 	}
 
+	if version == 5 {
+		split := strings.Split(string(ph), "|")
+		split[2] = hex.EncodeToString(totpSecret)
+		return PassHash(strings.Join(split, "|")), nil
+	}
+
 	return "", errors.New("unknown version")
 }
 
@@ -271,6 +308,10 @@ func (ph PassHash) Change(newPlainPass string) (PassHash, error) {
 		return HashPasswordV4(newPlainPass, langext.Conditional(hastotp, totpsecret, nil))
 	}
 
+	if version == 5 {
+		return HashPasswordV5(newPlainPass, langext.Conditional(hastotp, totpsecret, nil))
+	}
+
 	return "", errors.New("unknown version")
 }
 
@@ -278,8 +319,32 @@ func (ph PassHash) String() string {
 	return string(ph)
 }
 
+func (ph PassHash) MarshalJSON() ([]byte, error) {
+	if ph == "" {
+		return json.Marshal("")
+	}
+	return json.Marshal("*****")
+}
+
 func HashPassword(plainpass string, totpSecret []byte) (PassHash, error) {
-	return HashPasswordV4(plainpass, totpSecret)
+	return HashPasswordV5(plainpass, totpSecret)
+}
+
+func HashPasswordV5(plainpass string, totpSecret []byte) (PassHash, error) {
+	var strtotp string
+
+	if totpSecret == nil {
+		strtotp = "0"
+	} else {
+		strtotp = hex.EncodeToString(totpSecret)
+	}
+
+	payload, err := bcrypt.GenerateFromPassword(hash512(plainpass), bcrypt.MinCost)
+	if err != nil {
+		return "", err
+	}
+
+	return PassHash(fmt.Sprintf("5|%s|%s", string(payload), strtotp)), nil
 }
 
 func HashPasswordV4(plainpass string, totpSecret []byte) (PassHash, error) {
@@ -340,6 +405,13 @@ func HashPasswordV0(plainpass string) (PassHash, error) {
 	return PassHash(fmt.Sprintf("0|%s", plainpass)), nil
 }
 
+func hash512(s string) []byte {
+	h := sha512.New()
+	h.Write([]byte(s))
+	bs := h.Sum(nil)
+	return bs
+}
+
 func hash256(s string) []byte {
 	h := sha256.New()
 	h.Write([]byte(s))

cryptext/passHash_test.go

@@ -0,0 +1,210 @@
+package cryptext
+
+import (
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/totpext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"testing"
+)
+
+func TestPassHash1(t *testing.T) {
+	ph, err := HashPassword("test123", nil)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+}
+
+func TestPassHashTOTP(t *testing.T) {
+	sec, err := totpext.GenerateSecret()
+	tst.AssertNoErr(t, err)
+
+	ph, err := HashPassword("test123", sec)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertTrue(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertFalse(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+	tst.AssertTrue(t, ph.Verify("test123", langext.Ptr(totpext.TOTP(sec))))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+}
+
+func TestPassHashUpgrade_V0(t *testing.T) {
+	ph, err := HashPasswordV0("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+}
+
+func TestPassHashUpgrade_V1(t *testing.T) {
+	ph, err := HashPasswordV1("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+}
+
+func TestPassHashUpgrade_V2(t *testing.T) {
+	ph, err := HashPasswordV2("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+}
+
+func TestPassHashUpgrade_V3(t *testing.T) {
+	ph, err := HashPasswordV3("test123", nil)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+}
+
+func TestPassHashUpgrade_V3_TOTP(t *testing.T) {
+	sec, err := totpext.GenerateSecret()
+	tst.AssertNoErr(t, err)
+
+	ph, err := HashPasswordV3("test123", sec)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertTrue(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertFalse(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+	tst.AssertTrue(t, ph.Verify("test123", langext.Ptr(totpext.TOTP(sec))))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertTrue(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertFalse(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+	tst.AssertTrue(t, ph.Verify("test123", langext.Ptr(totpext.TOTP(sec))))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+}
+
+func TestPassHashUpgrade_V4(t *testing.T) {
+	ph, err := HashPasswordV4("test123", nil)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertFalse(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertTrue(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+}
+
+func TestPassHashUpgrade_V4_TOTP(t *testing.T) {
+	sec, err := totpext.GenerateSecret()
+	tst.AssertNoErr(t, err)
+
+	ph, err := HashPasswordV4("test123", sec)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertTrue(t, ph.HasTOTP())
+	tst.AssertTrue(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertFalse(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+	tst.AssertTrue(t, ph.Verify("test123", langext.Ptr(totpext.TOTP(sec))))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+
+	ph, err = ph.Upgrade("test123")
+	tst.AssertNoErr(t, err)
+
+	tst.AssertTrue(t, ph.Valid())
+	tst.AssertTrue(t, ph.HasTOTP())
+	tst.AssertFalse(t, ph.NeedsPasswordUpgrade())
+
+	tst.AssertFalse(t, ph.Verify("test123", nil))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+	tst.AssertTrue(t, ph.Verify("test123", langext.Ptr(totpext.TOTP(sec))))
+	tst.AssertFalse(t, ph.Verify("test124", nil))
+}

cryptext/pronouncablePassword.go

@@ -0,0 +1,263 @@
+package cryptext
+
+import (
+	"crypto/rand"
+	"io"
+	"math/big"
+	mathrand "math/rand"
+	"strings"
+)
+
+const (
+	ppStartChar            = "BCDFGHJKLMNPQRSTVWXZ"
+	ppEndChar              = "ABDEFIKMNORSTUXYZ"
+	ppVowel                = "AEIOUY"
+	ppConsonant            = "BCDFGHJKLMNPQRSTVWXZ"
+	ppSegmentLenMin        = 3
+	ppSegmentLenMax        = 7
+	ppMaxRepeatedVowel     = 2
+	ppMaxRepeatedConsonant = 2
+)
+
+var ppContinuation = map[uint8]string{
+	'A': "BCDFGHJKLMNPRSTVWXYZ",
+	'B': "ADFIKLMNORSTUY",
+	'C': "AEIKOUY",
+	'D': "AEILORSUYZ",
+	'E': "BCDFGHJKLMNPRSTVWXYZ",
+	'F': "ADEGIKLOPRTUY",
+	'G': "ABDEFHILMNORSTUY",
+	'H': "AEIOUY",
+	'I': "BCDFGHJKLMNPRSTVWXZ",
+	'J': "AEIOUY",
+	'K': "ADEFHILMNORSTUY",
+	'L': "ADEFGIJKMNOPSTUVWYZ",
+	'M': "ABEFIKOPSTUY",
+	'N': "ABEFIKOPSTUY",
+	'O': "BCDFGHJKLMNPRSTVWXYZ",
+	'P': "AEFIJLORSTUY",
+	'Q': "AEIOUY",
+	'R': "ADEFGHIJKLMNOPSTUVYZ",
+	'S': "ACDEIKLOPTUYZ",
+	'T': "AEHIJOPRSUWY",
+	'U': "BCDFGHJKLMNPRSTVWXZ",
+	'V': "AEIOUY",
+	'W': "AEIOUY",
+	'X': "AEIOUY",
+	'Y': "ABCDFGHKLMNPRSTVXZ",
+	'Z': "AEILOTUY",
+}
+
+var ppLog2Map = map[int]float64{
+	1:  0.00000000,
+	2:  1.00000000,
+	3:  1.58496250,
+	4:  2.00000000,
+	5:  2.32192809,
+	6:  2.58496250,
+	7:  2.80735492,
+	8:  3.00000000,
+	9:  3.16992500,
+	10: 3.32192809,
+	11: 3.45943162,
+	12: 3.58496250,
+	13: 3.70043972,
+	14: 3.80735492,
+	15: 3.90689060,
+	16: 4.00000000,
+	17: 4.08746284,
+	18: 4.16992500,
+	19: 4.24792751,
+	20: 4.32192809,
+	21: 4.39231742,
+	22: 4.45943162,
+	23: 4.52356196,
+	24: 4.58496250,
+	25: 4.64385619,
+	26: 4.70043972,
+	27: 4.75488750,
+	28: 4.80735492,
+	29: 4.85798100,
+	30: 4.90689060,
+	31: 4.95419631,
+	32: 5.00000000,
+}
+
+var (
+	ppVowelMap     = ppMakeSet(ppVowel)
+	ppConsonantMap = ppMakeSet(ppConsonant)
+	ppEndCharMap   = ppMakeSet(ppEndChar)
+)
+
+func ppMakeSet(v string) map[uint8]bool {
+	mp := make(map[uint8]bool, len(v))
+	for _, chr := range v {
+		mp[uint8(chr)] = true
+	}
+	return mp
+}
+
+func ppRandInt(rng io.Reader, max int) int {
+	v, err := rand.Int(rng, big.NewInt(int64(max)))
+	if err != nil {
+		panic(err)
+	}
+	return int(v.Int64())
+}
+
+func ppRand(rng io.Reader, chars string, entropy *float64) uint8 {
+	chr := chars[ppRandInt(rng, len(chars))]
+
+	*entropy = *entropy + ppLog2Map[len(chars)]
+
+	return chr
+}
+
+func ppCharType(chr uint8) (bool, bool) {
+	_, ok1 := ppVowelMap[chr]
+	_, ok2 := ppConsonantMap[chr]
+
+	return ok1, ok2
+}
+
+func ppCharsetRemove(cs string, set map[uint8]bool, allowEmpty bool) string {
+	result := ""
+	for _, chr := range cs {
+		if _, ok := set[uint8(chr)]; !ok {
+			result += string(chr)
+		}
+	}
+	if result == "" && !allowEmpty {
+		return cs
+	}
+	return result
+}
+
+func ppCharsetFilter(cs string, set map[uint8]bool, allowEmpty bool) string {
+	result := ""
+	for _, chr := range cs {
+		if _, ok := set[uint8(chr)]; ok {
+			result += string(chr)
+		}
+	}
+	if result == "" && !allowEmpty {
+		return cs
+	}
+	return result
+}
+
+func PronouncablePasswordExt(rng io.Reader, pwlen int) (string, float64) {
+
+	// kinda pseudo markov-chain - with a few extra rules and no weights...
+
+	if pwlen <= 0 {
+		return "", 0
+	}
+
+	vowelCount := 0
+	consoCount := 0
+	entropy := float64(0)
+
+	startChar := ppRand(rng, ppStartChar, &entropy)
+
+	result := string(startChar)
+	currentChar := startChar
+
+	isVowel, isConsonant := ppCharType(currentChar)
+	if isVowel {
+		vowelCount = 1
+	}
+	if isConsonant {
+		consoCount = ppMaxRepeatedConsonant
+	}
+
+	segmentLen := 1
+
+	segmentLenTarget := ppSegmentLenMin + ppRandInt(rng, ppSegmentLenMax-ppSegmentLenMin)
+
+	for len(result) < pwlen {
+
+		charset := ppContinuation[currentChar]
+		if vowelCount >= ppMaxRepeatedVowel {
+			charset = ppCharsetRemove(charset, ppVowelMap, false)
+		}
+		if consoCount >= ppMaxRepeatedConsonant {
+			charset = ppCharsetRemove(charset, ppConsonantMap, false)
+		}
+
+		lastOfSegment := false
+		newSegment := false
+
+		if len(result)+1 == pwlen {
+			// last of result
+			charset = ppCharsetFilter(charset, ppEndCharMap, false)
+		} else if segmentLen+1 == segmentLenTarget {
+			// last of segment
+			charsetNew := ppCharsetFilter(charset, ppEndCharMap, true)
+			if charsetNew != "" {
+				charset = charsetNew
+				lastOfSegment = true
+			}
+		} else if segmentLen >= segmentLenTarget {
+			// (perhaps) start of new segment
+			if _, ok := ppEndCharMap[currentChar]; ok {
+				charset = ppStartChar
+				newSegment = true
+			} else {
+				// continue segment for one more char to (hopefully) find an end-char
+				charsetNew := ppCharsetFilter(charset, ppEndCharMap, true)
+				if charsetNew != "" {
+					charset = charsetNew
+					lastOfSegment = true
+				}
+			}
+		} else {
+			// normal continuation
+		}
+
+		newChar := ppRand(rng, charset, &entropy)
+		if lastOfSegment {
+			currentChar = newChar
+			segmentLen++
+			result += strings.ToLower(string(newChar))
+		} else if newSegment {
+			currentChar = newChar
+			segmentLen = 1
+			result += strings.ToUpper(string(newChar))
+			segmentLenTarget = ppSegmentLenMin + ppRandInt(rng, ppSegmentLenMax-ppSegmentLenMin)
+			vowelCount = 0
+			consoCount = 0
+		} else {
+			currentChar = newChar
+			segmentLen++
+			result += strings.ToLower(string(newChar))
+		}
+
+		isVowel, isConsonant := ppCharType(currentChar)
+		if isVowel {
+			vowelCount++
+			consoCount = 0
+		}
+		if isConsonant {
+			vowelCount = 0
+			if newSegment {
+				consoCount = ppMaxRepeatedConsonant
+			} else {
+				consoCount++
+			}
+		}
+	}
+
+	return result, entropy
+}
+
+func PronouncablePassword(len int) string {
+	v, _ := PronouncablePasswordExt(rand.Reader, len)
+	return v
+}
+
+func PronouncablePasswordSeeded(seed int64, len int) string {
+
+	v, _ := PronouncablePasswordExt(mathrand.New(mathrand.NewSource(seed)), len)
+	return v
+}

cryptext/pronouncablePassword_test.go

@@ -0,0 +1,35 @@
+package cryptext
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+)
+
+func TestPronouncablePasswordExt(t *testing.T) {
+	for i := 0; i < 20; i++ {
+		pw, entropy := PronouncablePasswordExt(rand.New(rand.NewSource(int64(i))), 16)
+		fmt.Printf("[%.2f] => %s\n", entropy, pw)
+	}
+}
+
+func TestPronouncablePasswordSeeded(t *testing.T) {
+	for i := 0; i < 20; i++ {
+		pw := PronouncablePasswordSeeded(int64(i), 8)
+		fmt.Printf("%s\n", pw)
+	}
+}
+
+func TestPronouncablePassword(t *testing.T) {
+	for i := 0; i < 20; i++ {
+		pw := PronouncablePassword(i + 1)
+		fmt.Printf("%s\n", pw)
+	}
+}
+
+func TestPronouncablePasswordWrongLen(t *testing.T) {
+	PronouncablePassword(0)
+	PronouncablePassword(-1)
+	PronouncablePassword(-2)
+	PronouncablePassword(-3)
+}

ctxext/getter.go

@@ -0,0 +1,27 @@
+package ctxext
+
+import "context"
+
+func Value[T any](ctx context.Context, key any) (T, bool) {
+	v := ctx.Value(key)
+	if v == nil {
+		return *new(T), false
+	}
+	if tv, ok := v.(T); !ok {
+		return *new(T), false
+	} else {
+		return tv, true
+	}
+}
+
+func ValueOrDefault[T any](ctx context.Context, key any, def T) T {
+	v := ctx.Value(key)
+	if v == nil {
+		return def
+	}
+	if tv, ok := v.(T); !ok {
+		return def
+	} else {
+		return tv
+	}
+}

cursortoken/direction.go

@@ -0,0 +1,18 @@
+package cursortoken
+
+type SortDirection string //@enum:type
+
+const (
+	SortASC  SortDirection = "ASC"
+	SortDESC SortDirection = "DESC"
+)
+
+func (sd SortDirection) ToMongo() int {
+	if sd == SortASC {
+		return 1
+	} else if sd == SortDESC {
+		return -1
+	} else {
+		return 0
+	}
+}

cursortoken/filter.go

@@ -0,0 +1,15 @@
+package cursortoken
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+type RawFilter interface {
+	FilterQuery(ctx context.Context) mongo.Pipeline
+}
+
+type Filter interface {
+	FilterQuery(ctx context.Context) mongo.Pipeline
+	Pagination(ctx context.Context) (string, SortDirection, string, SortDirection)
+}

cursortoken/token.go

@@ -0,0 +1,95 @@
+package cursortoken
+
+import (
+	"encoding/base32"
+	"encoding/json"
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type CursorToken interface {
+	Token() string
+	IsStart() bool
+	IsEnd() bool
+}
+
+type Mode string
+
+const (
+	CTMStart  Mode = "START"
+	CTMNormal Mode = "NORMAL"
+	CTMEnd    Mode = "END"
+)
+
+type Extra struct {
+	Timestamp *time.Time
+	Id        *string
+	Page      *int
+	PageSize  *int
+}
+
+func Decode(tok string) (CursorToken, error) {
+	if tok == "" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@start" {
+		return Start(), nil
+	}
+	if strings.ToLower(tok) == "@end" {
+		return End(), nil
+	}
+	if strings.ToLower(tok) == "$end" {
+		return PageEnd(), nil
+	}
+	if strings.HasPrefix(tok, "$") && len(tok) > 1 {
+		n, err := strconv.ParseInt(tok[1:], 10, 64)
+		if err != nil {
+			return nil, exerr.Wrap(err, "failed to deserialize token").Str("token", tok).WithType(exerr.TypeCursorTokenDecode).Build()
+		}
+		return Page(int(n)), nil
+	}
+
+	if strings.HasPrefix(tok, "tok_") {
+
+		body, err := base32.StdEncoding.DecodeString(tok[len("tok_"):])
+		if err != nil {
+			return nil, err
+		}
+
+		var tokenDeserialize cursorTokenKeySortSerialize
+		err = json.Unmarshal(body, &tokenDeserialize)
+		if err != nil {
+			return nil, exerr.Wrap(err, "failed to deserialize token").Str("token", tok).WithType(exerr.TypeCursorTokenDecode).Build()
+		}
+
+		token := CTKeySort{Mode: CTMNormal}
+
+		if tokenDeserialize.ValuePrimary != nil {
+			token.ValuePrimary = *tokenDeserialize.ValuePrimary
+		}
+		if tokenDeserialize.ValueSecondary != nil {
+			token.ValueSecondary = *tokenDeserialize.ValueSecondary
+		}
+		if tokenDeserialize.Direction != nil {
+			token.Direction = *tokenDeserialize.Direction
+		}
+		if tokenDeserialize.DirectionSecondary != nil {
+			token.DirectionSecondary = *tokenDeserialize.DirectionSecondary
+		}
+		if tokenDeserialize.PageSize != nil {
+			token.PageSize = *tokenDeserialize.PageSize
+		}
+
+		token.Extra.Timestamp = tokenDeserialize.ExtraTimestamp
+		token.Extra.Id = tokenDeserialize.ExtraId
+		token.Extra.Page = tokenDeserialize.ExtraPage
+		token.Extra.PageSize = tokenDeserialize.ExtraPageSize
+
+		return token, nil
+
+	} else {
+		return nil, exerr.New(exerr.TypeCursorTokenDecode, "could not decode token, missing/unknown prefix").Str("token", tok).Build()
+	}
+}

cursortoken/tokenKeySort.go

@@ -0,0 +1,136 @@
+package cursortoken
+
+import (
+	"encoding/base32"
+	"encoding/json"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"time"
+)
+
+type CTKeySort struct {
+	Mode               Mode
+	ValuePrimary       string
+	ValueSecondary     string
+	Direction          SortDirection
+	DirectionSecondary SortDirection
+	PageSize           int
+	Extra              Extra
+}
+
+type cursorTokenKeySortSerialize struct {
+	ValuePrimary       *string        `json:"v1,omitempty"`
+	ValueSecondary     *string        `json:"v2,omitempty"`
+	Direction          *SortDirection `json:"dir,omitempty"`
+	DirectionSecondary *SortDirection `json:"dir2,omitempty"`
+	PageSize           *int           `json:"size,omitempty"`
+
+	ExtraTimestamp *time.Time `json:"ts,omitempty"`
+	ExtraId        *string    `json:"id,omitempty"`
+	ExtraPage      *int       `json:"pg,omitempty"`
+	ExtraPageSize  *int       `json:"sz,omitempty"`
+}
+
+func NewKeySortToken(valuePrimary string, valueSecondary string, direction SortDirection, directionSecondary SortDirection, pageSize int, extra Extra) CursorToken {
+	return CTKeySort{
+		Mode:               CTMNormal,
+		ValuePrimary:       valuePrimary,
+		ValueSecondary:     valueSecondary,
+		Direction:          direction,
+		DirectionSecondary: directionSecondary,
+		PageSize:           pageSize,
+		Extra:              extra,
+	}
+}
+
+func Start() CursorToken {
+	return CTKeySort{
+		Mode:               CTMStart,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func End() CursorToken {
+	return CTKeySort{
+		Mode:               CTMEnd,
+		ValuePrimary:       "",
+		ValueSecondary:     "",
+		Direction:          "",
+		DirectionSecondary: "",
+		PageSize:           0,
+		Extra:              Extra{},
+	}
+}
+
+func (c CTKeySort) Token() string {
+
+	if c.Mode == CTMStart {
+		return "@start"
+	}
+	if c.Mode == CTMEnd {
+		return "@end"
+	}
+
+	// We kinda manually implement omitempty for the CursorToken here
+	// because omitempty does not work for time.Time and otherwise we would always
+	// get weird time values when decoding a token that initially didn't have an Timestamp set
+	// For this usecase we treat Unix=0 as an empty timestamp
+
+	sertok := cursorTokenKeySortSerialize{}
+
+	if c.ValuePrimary != "" {
+		sertok.ValuePrimary = &c.ValuePrimary
+	}
+	if c.ValueSecondary != "" {
+		sertok.ValueSecondary = &c.ValueSecondary
+	}
+	if c.Direction != "" {
+		sertok.Direction = &c.Direction
+	}
+	if c.DirectionSecondary != "" {
+		sertok.DirectionSecondary = &c.DirectionSecondary
+	}
+	if c.PageSize != 0 {
+		sertok.PageSize = &c.PageSize
+	}
+
+	sertok.ExtraTimestamp = c.Extra.Timestamp
+	sertok.ExtraId = c.Extra.Id
+	sertok.ExtraPage = c.Extra.Page
+	sertok.ExtraPageSize = c.Extra.PageSize
+
+	body, err := json.Marshal(sertok)
+	if err != nil {
+		panic(err)
+	}
+
+	return "tok_" + base32.StdEncoding.EncodeToString(body)
+}
+
+func (c CTKeySort) IsEnd() bool {
+	return c.Mode == CTMEnd
+}
+
+func (c CTKeySort) IsStart() bool {
+	return c.Mode == CTMStart
+}
+
+func (c CTKeySort) valuePrimaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValuePrimary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}
+
+func (c CTKeySort) valueSecondaryObjectId() (primitive.ObjectID, bool) {
+	if oid, err := primitive.ObjectIDFromHex(c.ValueSecondary); err == nil {
+		return oid, true
+	} else {
+		return primitive.ObjectID{}, false
+	}
+}

cursortoken/tokenPaginate.go

@@ -0,0 +1,41 @@
+package cursortoken
+
+import "strconv"
+
+type CTPaginated struct {
+	Mode Mode
+	Page int
+}
+
+func Page(p int) CursorToken {
+	return CTPaginated{
+		Mode: CTMNormal,
+		Page: p,
+	}
+}
+
+func PageEnd() CursorToken {
+	return CTPaginated{
+		Mode: CTMEnd,
+		Page: 0,
+	}
+}
+
+func (c CTPaginated) Token() string {
+	if c.Mode == CTMStart {
+		return "$1"
+	}
+	if c.Mode == CTMEnd {
+		return "$end"
+	}
+
+	return "$" + strconv.Itoa(c.Page)
+}
+
+func (c CTPaginated) IsEnd() bool {
+	return c.Mode == CTMEnd
+}
+
+func (c CTPaginated) IsStart() bool {
+	return c.Mode == CTMStart || c.Page == 1
+}

dataext/broadcaster.go

@@ -0,0 +1,230 @@
+package dataext
+
+import (
+	"context"
+	"iter"
+	"sync"
+	"time"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/syncext"
+	"github.com/rs/xid"
+)
+
+// Broadcaster is a simple Broadcaster channel
+// This is a simpler interface over Broadcaster - which does not have distinct namespaces
+type Broadcaster[TData any] struct {
+	masterLock *sync.Mutex
+
+	subscriptions []*broadcastSubscription[TData]
+}
+
+type BroadcastSubscription interface {
+	Unsubscribe()
+}
+
+type broadcastSubscription[TData any] struct {
+	ID string
+
+	parent *Broadcaster[TData]
+
+	subLock *sync.Mutex
+
+	Func func(TData)
+	Chan chan TData
+
+	UnsubChan chan bool
+}
+
+func (p *broadcastSubscription[TData]) Unsubscribe() {
+	p.parent.unsubscribe(p)
+}
+
+func NewBroadcaster[TData any](capacity int) *Broadcaster[TData] {
+	return &Broadcaster[TData]{
+		masterLock:    &sync.Mutex{},
+		subscriptions: make([]*broadcastSubscription[TData], 0, capacity),
+	}
+}
+
+func (bb *Broadcaster[TData]) SubscriberCount() int {
+	bb.masterLock.Lock()
+	defer bb.masterLock.Unlock()
+
+	return len(bb.subscriptions)
+}
+
+// Publish sends `data` to all subscriber
+// But unbuffered - if one is currently not listening, we skip (the actualReceiver < subscriber)
+func (bb *Broadcaster[TData]) Publish(data TData) (subscriber int, actualReceiver int) {
+	bb.masterLock.Lock()
+	subs := langext.ArrCopy(bb.subscriptions)
+	bb.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		func() {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				msgSent := syncext.WriteNonBlocking(sub.Chan, data)
+				if msgSent {
+					actualReceiver++
+				}
+			}
+		}()
+	}
+
+	return subscriber, actualReceiver
+}
+
+// PublishWithContext sends `data` to all subscriber
+// buffered - if one is currently not listening, we wait (but error out when the context runs out)
+func (bb *Broadcaster[TData]) PublishWithContext(ctx context.Context, data TData) (subscriber int, actualReceiver int, err error) {
+	bb.masterLock.Lock()
+	subs := langext.ArrCopy(bb.subscriptions)
+	bb.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		err := func() error {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				err := syncext.WriteChannelWithContext(ctx, sub.Chan, data)
+				if err != nil {
+					return err
+				}
+				actualReceiver++
+			}
+
+			return nil
+		}()
+		if err != nil {
+			return subscriber, actualReceiver, err
+		}
+	}
+
+	return subscriber, actualReceiver, nil
+}
+
+// PublishWithTimeout sends `data` to all subscriber
+// buffered - if one is currently not listening, we wait (but wait at most `timeout` - if the timeout is exceeded then actualReceiver < subscriber)
+func (bb *Broadcaster[TData]) PublishWithTimeout(data TData, timeout time.Duration) (subscriber int, actualReceiver int) {
+	bb.masterLock.Lock()
+	subs := langext.ArrCopy(bb.subscriptions)
+	bb.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		func() {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				ok := syncext.WriteChannelWithTimeout(sub.Chan, data, timeout)
+				if ok {
+					actualReceiver++
+				}
+			}
+		}()
+	}
+
+	return subscriber, actualReceiver
+}
+
+func (bb *Broadcaster[TData]) SubscribeByCallback(fn func(TData)) BroadcastSubscription {
+	bb.masterLock.Lock()
+	defer bb.masterLock.Unlock()
+
+	sub := &broadcastSubscription[TData]{ID: xid.New().String(), parent: bb, subLock: &sync.Mutex{}, Func: fn, UnsubChan: nil}
+
+	bb.subscriptions = append(bb.subscriptions, sub)
+
+	return sub
+}
+
+func (bb *Broadcaster[TData]) SubscribeByChan(chanBufferSize int) (chan TData, BroadcastSubscription) {
+	bb.masterLock.Lock()
+	defer bb.masterLock.Unlock()
+
+	msgCh := make(chan TData, chanBufferSize)
+
+	sub := &broadcastSubscription[TData]{ID: xid.New().String(), parent: bb, subLock: &sync.Mutex{}, Chan: msgCh, UnsubChan: nil}
+
+	bb.subscriptions = append(bb.subscriptions, sub)
+
+	return msgCh, sub
+}
+
+func (bb *Broadcaster[TData]) SubscribeByIter(chanBufferSize int) (iter.Seq[TData], BroadcastSubscription) {
+	bb.masterLock.Lock()
+	defer bb.masterLock.Unlock()
+
+	msgCh := make(chan TData, chanBufferSize)
+	unsubChan := make(chan bool, 8)
+
+	sub := &broadcastSubscription[TData]{ID: xid.New().String(), parent: bb, subLock: &sync.Mutex{}, Chan: msgCh, UnsubChan: unsubChan}
+
+	bb.subscriptions = append(bb.subscriptions, sub)
+
+	iterFun := func(yield func(TData) bool) {
+		for {
+			select {
+			case msg := <-msgCh:
+				if !yield(msg) {
+					sub.Unsubscribe()
+					return
+				}
+			case <-sub.UnsubChan:
+				sub.Unsubscribe()
+				return
+			}
+		}
+	}
+
+	return iterFun, sub
+}
+
+func (bb *Broadcaster[TData]) unsubscribe(p *broadcastSubscription[TData]) {
+	bb.masterLock.Lock()
+	defer bb.masterLock.Unlock()
+
+	p.subLock.Lock()
+	defer p.subLock.Unlock()
+
+	if p.Chan != nil {
+		close(p.Chan)
+		p.Chan = nil
+	}
+	if p.UnsubChan != nil {
+		syncext.WriteNonBlocking(p.UnsubChan, true)
+		close(p.UnsubChan)
+		p.UnsubChan = nil
+	}
+
+	bb.subscriptions = langext.ArrFilter(bb.subscriptions, func(v *broadcastSubscription[TData]) bool {
+		return v.ID != p.ID
+	})
+}

dataext/broadcaster_test.go

@@ -0,0 +1,332 @@
+package dataext
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestNewBroadcast(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+	if bb == nil {
+		t.Fatal("NewBroadcaster returned nil")
+	}
+	if bb.masterLock == nil {
+		t.Fatal("masterLock is nil")
+	}
+	if bb.subscriptions == nil {
+		t.Fatal("subscriptions is nil")
+	}
+}
+
+func TestBroadcast_SubscribeByCallback(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	var received string
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	callback := func(msg string) {
+		received = msg
+		wg.Done()
+	}
+
+	sub := bb.SubscribeByCallback(callback)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers := bb.Publish("hello")
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Wait for the callback to be executed
+	wg.Wait()
+
+	if received != "hello" {
+		t.Fatalf("Expected to receive 'hello', got '%s'", received)
+	}
+}
+
+func TestBroadcast_SubscribeByChan(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	ch, sub := bb.SubscribeByChan(1)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers := bb.Publish("hello")
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Read from the channel with a timeout to avoid blocking
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+}
+
+func TestBroadcast_SubscribeByIter(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	iterSeq, sub := bb.SubscribeByIter(1)
+	defer sub.Unsubscribe()
+
+	// Channel to communicate when message is received
+	done := make(chan bool)
+	received := false
+
+	// Start a goroutine to use the iterator
+	go func() {
+		for msg := range iterSeq {
+			if msg == "hello" {
+				received = true
+				done <- true
+				return // Stop iteration
+			}
+		}
+	}()
+
+	// Give time for the iterator to start
+	time.Sleep(100 * time.Millisecond)
+
+	// Publish a message
+	bb.Publish("hello")
+
+	// Wait for the message to be received or timeout
+	select {
+	case <-done:
+		if !received {
+			t.Fatal("Message was received but not 'hello'")
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	subCount := bb.SubscriberCount()
+	if subCount != 0 {
+		t.Fatalf("Expected 0 receivers, got %d", subCount)
+	}
+}
+
+func TestBroadcast_Publish(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	// Test publishing with no subscribers
+	subs, receivers := bb.Publish("hello")
+	if subs != 0 {
+		t.Fatalf("Expected 0 subscribers, got %d", subs)
+	}
+	if receivers != 0 {
+		t.Fatalf("Expected 0 receivers, got %d", receivers)
+	}
+
+	// Add a subscriber
+	ch, sub := bb.SubscribeByChan(1)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers = bb.Publish("hello")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Test non-blocking behavior with a full channel
+	// First fill the channel
+	bb.Publish("fill")
+
+	// Now publish again - this should not block but may skip the receiver
+	subs, receivers = bb.Publish("overflow")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	_ = receivers // may be 0 if channel is full
+
+	// Drain the channel
+	<-ch
+}
+
+func TestBroadcast_PublishWithTimeout(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	// Add a subscriber with a channel
+	ch, sub := bb.SubscribeByChan(1)
+	defer sub.Unsubscribe()
+
+	// Publish with a timeout
+	subs, receivers := bb.PublishWithTimeout("hello", 100*time.Millisecond)
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Fill the channel
+	bb.Publish("fill")
+
+	// Test timeout behavior with a full channel
+	start := time.Now()
+	subs, receivers = bb.PublishWithTimeout("timeout-test", 50*time.Millisecond)
+	elapsed := time.Since(start)
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	// The receiver count should be 0 if the timeout occurred
+	if elapsed < 50*time.Millisecond {
+		t.Fatalf("Expected to wait at least 50ms, only waited %v", elapsed)
+	}
+
+	// Drain the channel
+	<-ch
+}
+
+func TestBroadcast_PublishWithContext(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	// Add a subscriber with a channel
+	ch, sub := bb.SubscribeByChan(1)
+	defer sub.Unsubscribe()
+
+	// Create a context
+	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+
+	// Publish with context
+	subs, receivers, err := bb.PublishWithContext(ctx, "hello")
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Fill the channel
+	bb.Publish("fill")
+
+	// Test context cancellation with a full channel
+	ctx, cancel = context.WithCancel(context.Background())
+
+	// Cancel the context after a short delay
+	go func() {
+		time.Sleep(50 * time.Millisecond)
+		cancel()
+	}()
+
+	start := time.Now()
+	subs, receivers, err = bb.PublishWithContext(ctx, "context-test")
+	elapsed := time.Since(start)
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	// Should get a context canceled error
+	if err == nil {
+		t.Fatal("Expected context canceled error, got nil")
+	}
+
+	if elapsed < 50*time.Millisecond {
+		t.Fatalf("Expected to wait at least 50ms, only waited %v", elapsed)
+	}
+
+	// Drain the channel
+	<-ch
+}
+
+func TestBroadcast_Unsubscribe(t *testing.T) {
+	bb := NewBroadcaster[string](10)
+
+	// Add a subscriber
+	ch, sub := bb.SubscribeByChan(1)
+
+	// Publish a message
+	subs, receivers := bb.Publish("hello")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Unsubscribe
+	sub.Unsubscribe()
+
+	// Publish again
+	subs, receivers = bb.Publish("after-unsub")
+	if subs != 0 {
+		t.Fatalf("Expected 0 subscribers after unsubscribe, got %d", subs)
+	}
+	if receivers != 0 {
+		t.Fatalf("Expected 0 receivers after unsubscribe, got %d", receivers)
+	}
+
+	// Check that the subscriber count is 0
+	if bb.SubscriberCount() != 0 {
+		t.Fatalf("Expected SubscriberCount() == 0, got %d", bb.SubscriberCount())
+	}
+}

dataext/bufferedReadCloser.go

@@ -115,6 +115,9 @@ func (b *bufferedReadCloser) BufferedAll() ([]byte, error) {
 				return nil, err
 			}
 		}
+		if err := b.Reset(); err != nil {
+			return nil, err
+		}
 		return b.buffer, nil
 
 	case modeSourceFinished:
@@ -131,10 +134,22 @@ func (b *bufferedReadCloser) BufferedAll() ([]byte, error) {
 	}
 }
 
+// Reset resets the buffer to the beginning of the buffer.
+// If the original source is partially read, we will finish reading it and fill our buffer
 func (b *bufferedReadCloser) Reset() error {
 	switch b.mode {
 	case modeSourceReading:
-		fallthrough
+		if b.off == 0 {
+			return nil // nobody has read anything yet
+		}
+		err := b.Close()
+		if err != nil {
+			return err
+		}
+		b.mode = modeBufferReading
+		b.off = 0
+		return nil
+
 	case modeSourceFinished:
 		err := b.Close()
 		if err != nil {

dataext/casMutex.go

@@ -0,0 +1,254 @@
+package dataext
+
+import (
+	"context"
+	"golang.org/x/sync/semaphore"
+	"runtime"
+	"sync"
+	"sync/atomic"
+	"time"
+	"unsafe"
+)
+
+// from https://github.com/viney-shih/go-lock/blob/2f19fd8ce335e33e0ab9dccb1ff2ce820c3da332/cas.go
+
+// CASMutex is the struct implementing RWMutex with CAS mechanism.
+type CASMutex struct {
+	state     casState
+	turnstile *semaphore.Weighted
+
+	broadcastChan chan struct{}
+	broadcastMut  sync.RWMutex
+}
+
+func NewCASMutex() *CASMutex {
+	return &CASMutex{
+		state:         casStateNoLock,
+		turnstile:     semaphore.NewWeighted(1),
+		broadcastChan: make(chan struct{}),
+	}
+}
+
+type casState int32
+
+const (
+	casStateUndefined casState = iota - 2 // -2
+	casStateWriteLock                     // -1
+	casStateNoLock                        // 0
+	casStateReadLock                      // >= 1
+)
+
+func (m *CASMutex) getState(n int32) casState {
+	switch st := casState(n); {
+	case st == casStateWriteLock:
+		fallthrough
+	case st == casStateNoLock:
+		return st
+	case st >= casStateReadLock:
+		return casStateReadLock
+	default:
+		// actually, it should not happened.
+		return casStateUndefined
+	}
+}
+
+func (m *CASMutex) listen() <-chan struct{} {
+	m.broadcastMut.RLock()
+	defer m.broadcastMut.RUnlock()
+
+	return m.broadcastChan
+}
+
+func (m *CASMutex) broadcast() {
+	newCh := make(chan struct{})
+
+	m.broadcastMut.Lock()
+	ch := m.broadcastChan
+	m.broadcastChan = newCh
+	m.broadcastMut.Unlock()
+
+	close(ch)
+}
+
+func (m *CASMutex) tryLock(ctx context.Context) bool {
+	for {
+		broker := m.listen()
+		if atomic.CompareAndSwapInt32(
+			(*int32)(unsafe.Pointer(&m.state)),
+			int32(casStateNoLock),
+			int32(casStateWriteLock),
+		) {
+			return true
+		}
+
+		if ctx == nil {
+			return false
+		}
+
+		select {
+		case <-ctx.Done():
+			// timeout or cancellation
+			return false
+		case <-broker:
+			// waiting for signal triggered by m.broadcast() and trying again.
+		}
+	}
+}
+
+// TryLockWithContext attempts to acquire the lock, blocking until resources
+// are available or ctx is done (timeout or cancellation).
+func (m *CASMutex) TryLockWithContext(ctx context.Context) bool {
+	if err := m.turnstile.Acquire(ctx, 1); err != nil {
+		// Acquire failed due to timeout or cancellation
+		return false
+	}
+
+	defer m.turnstile.Release(1)
+
+	return m.tryLock(ctx)
+}
+
+// Lock acquires the lock.
+// If it is currently held by others, Lock will wait until it has a chance to acquire it.
+func (m *CASMutex) Lock() {
+	ctx := context.Background()
+
+	m.TryLockWithContext(ctx)
+}
+
+// TryLock attempts to acquire the lock without blocking.
+// Return false if someone is holding it now.
+func (m *CASMutex) TryLock() bool {
+	if !m.turnstile.TryAcquire(1) {
+		return false
+	}
+
+	defer m.turnstile.Release(1)
+
+	return m.tryLock(nil)
+}
+
+// TryLockWithTimeout attempts to acquire the lock within a period of time.
+// Return false if spending time is more than duration and no chance to acquire it.
+func (m *CASMutex) TryLockWithTimeout(duration time.Duration) bool {
+	ctx, cancel := context.WithTimeout(context.Background(), duration)
+	defer cancel()
+
+	return m.TryLockWithContext(ctx)
+}
+
+// Unlock releases the lock.
+func (m *CASMutex) Unlock() {
+	if ok := atomic.CompareAndSwapInt32(
+		(*int32)(unsafe.Pointer(&m.state)),
+		int32(casStateWriteLock),
+		int32(casStateNoLock),
+	); !ok {
+		panic("Unlock failed")
+	}
+
+	m.broadcast()
+}
+
+func (m *CASMutex) rTryLock(ctx context.Context) bool {
+	for {
+		broker := m.listen()
+		n := atomic.LoadInt32((*int32)(unsafe.Pointer(&m.state)))
+		st := m.getState(n)
+		switch st {
+		case casStateNoLock, casStateReadLock:
+			if atomic.CompareAndSwapInt32((*int32)(unsafe.Pointer(&m.state)), n, n+1) {
+				return true
+			}
+		}
+
+		if ctx == nil {
+			return false
+		}
+
+		select {
+		case <-ctx.Done():
+			// timeout or cancellation
+			return false
+		default:
+			switch st {
+			// read-lock failed due to concurrence issue, try again immediately
+			case casStateNoLock, casStateReadLock:
+				runtime.Gosched() // allow other goroutines to do stuff.
+				continue
+			}
+		}
+
+		select {
+		case <-ctx.Done():
+			// timeout or cancellation
+			return false
+		case <-broker:
+			// waiting for signal triggered by m.broadcast() and trying again.
+		}
+	}
+}
+
+// RTryLockWithContext attempts to acquire the read lock, blocking until resources
+// are available or ctx is done (timeout or cancellation).
+func (m *CASMutex) RTryLockWithContext(ctx context.Context) bool {
+	if err := m.turnstile.Acquire(ctx, 1); err != nil {
+		// Acquire failed due to timeout or cancellation
+		return false
+	}
+
+	m.turnstile.Release(1)
+
+	return m.rTryLock(ctx)
+}
+
+// RLock acquires the read lock.
+// If it is currently held by others writing, RLock will wait until it has a chance to acquire it.
+func (m *CASMutex) RLock() {
+	ctx := context.Background()
+
+	m.RTryLockWithContext(ctx)
+}
+
+// RTryLock attempts to acquire the read lock without blocking.
+// Return false if someone is writing it now.
+func (m *CASMutex) RTryLock() bool {
+	if !m.turnstile.TryAcquire(1) {
+		return false
+	}
+
+	m.turnstile.Release(1)
+
+	return m.rTryLock(nil)
+}
+
+// RTryLockWithTimeout attempts to acquire the read lock within a period of time.
+// Return false if spending time is more than duration and no chance to acquire it.
+func (m *CASMutex) RTryLockWithTimeout(duration time.Duration) bool {
+	ctx, cancel := context.WithTimeout(context.Background(), duration)
+	defer cancel()
+
+	return m.RTryLockWithContext(ctx)
+}
+
+// RUnlock releases the read lock.
+func (m *CASMutex) RUnlock() {
+	n := atomic.AddInt32((*int32)(unsafe.Pointer(&m.state)), -1)
+	switch m.getState(n) {
+	case casStateUndefined, casStateWriteLock:
+		panic("RUnlock failed")
+	case casStateNoLock:
+		m.broadcast()
+	}
+}
+
+// RLocker returns a Locker interface that implements the Lock and Unlock methods
+// by calling CASMutex.RLock and CASMutex.RUnlock.
+func (m *CASMutex) RLocker() sync.Locker {
+	return (*rlocker)(m)
+}
+
+type rlocker CASMutex
+
+func (r *rlocker) Lock()   { (*CASMutex)(r).RLock() }
+func (r *rlocker) Unlock() { (*CASMutex)(r).RUnlock() }

dataext/delayedCombiningInvoker.go

@@ -0,0 +1,202 @@
+package dataext
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/syncext"
+)
+
+// DelayedCombiningInvoker is a utility to combine multiple consecutive requests into a single execution
+//
+// Requests are made with Request(), and consecutive requests are combined during the `delay` period.
+//
+// Can be used, e.g., for search-controls, where we want to init the search when teh user stops typing
+// Or generally to queue an execution once a burst of requests is over.
+type DelayedCombiningInvoker struct {
+	syncLock           sync.Mutex
+	triggerChan        chan bool
+	cancelChan         chan bool
+	execNowChan        chan bool
+	action             func()
+	delay              time.Duration
+	maxDelay           time.Duration
+	executorRunning    *syncext.AtomicBool
+	pendingRequests    *syncext.Atomic[int]
+	lastRequestTime    time.Time
+	initialRequestTime time.Time
+
+	onExecutionStart []func(immediately bool)          // listener ( actual execution of action starts )
+	onExecutionDone  []func()                          // listener ( actual execution of action finished )
+	onRequest        []func(pending int, initial bool) // listener ( a request came in, waiting for execution )
+}
+
+func NewDelayedCombiningInvoker(action func(), delay time.Duration, maxDelay time.Duration) *DelayedCombiningInvoker {
+	return &DelayedCombiningInvoker{
+		action:             action,
+		delay:              delay,
+		maxDelay:           maxDelay,
+		executorRunning:    syncext.NewAtomicBool(false),
+		pendingRequests:    syncext.NewAtomic[int](0),
+		triggerChan:        make(chan bool),
+		cancelChan:         make(chan bool, 1),
+		execNowChan:        make(chan bool, 1),
+		lastRequestTime:    time.Now(),
+		initialRequestTime: time.Now(),
+		onExecutionStart:   make([]func(bool), 0),
+		onExecutionDone:    make([]func(), 0),
+		onRequest:          make([]func(int, bool), 0),
+	}
+}
+
+func (d *DelayedCombiningInvoker) Request() {
+	now := time.Now()
+
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+
+	if d.executorRunning.Get() {
+		d.lastRequestTime = now
+		d.pendingRequests.Update(func(v int) int { return v + 1 })
+
+		for _, fn := range d.onRequest {
+			_ = langext.RunPanicSafe(func() { fn(d.pendingRequests.Get(), true) })
+		}
+
+		d.triggerChan <- true
+	} else {
+		d.initialRequestTime = now
+		d.lastRequestTime = now
+
+		d.executorRunning.Set(true)
+		d.pendingRequests.Set(1)
+		syncext.ReadNonBlocking(d.triggerChan) // clear the channel
+		syncext.ReadNonBlocking(d.cancelChan)  // clear the channel
+		syncext.ReadNonBlocking(d.execNowChan) // clear the channel
+
+		for _, fn := range d.onRequest {
+			_ = langext.RunPanicSafe(func() { fn(d.pendingRequests.Get(), false) })
+		}
+
+		go d.run()
+	}
+}
+
+func (d *DelayedCombiningInvoker) run() {
+
+	needsExecutorRunningCleanup := true
+	defer func() {
+		if needsExecutorRunningCleanup {
+			d.syncLock.Lock()
+			d.executorRunning.Set(false)
+			d.syncLock.Unlock()
+		}
+	}()
+
+	for {
+		d.syncLock.Lock()
+		timeOut := min(d.maxDelay-time.Since(d.initialRequestTime), d.delay-time.Since(d.lastRequestTime))
+		if timeOut < 0 {
+			timeOut = 0
+		}
+		d.syncLock.Unlock()
+
+		immediately := false
+
+		select {
+		case <-d.execNowChan:
+			// run immediately
+			immediately = true
+			break
+		case <-d.triggerChan:
+			// external trigger - needs to re-evaluate
+			break
+		case <-d.cancelChan:
+			// cancel
+			return
+		case <-time.After(timeOut):
+			// time elapsed - check for execution
+			break
+
+		}
+
+		d.syncLock.Lock()
+		execute := immediately || time.Since(d.lastRequestTime) >= d.delay || time.Since(d.initialRequestTime) >= d.maxDelay
+		if !execute {
+			d.syncLock.Unlock()
+			continue
+		}
+
+		d.pendingRequests.Set(0)
+
+		for _, fn := range d.onExecutionStart {
+			_ = langext.RunPanicSafe(func() { fn(immediately) })
+		}
+
+		// =================================================
+		_ = langext.RunPanicSafe(d.action)
+		// =================================================
+
+		d.executorRunning.Set(false) // ensure HasPendingRequests returns fals ein onExecutionDone listener
+		needsExecutorRunningCleanup = false
+
+		for _, fn := range d.onExecutionDone {
+			_ = langext.RunPanicSafe(fn)
+		}
+
+		d.syncLock.Unlock()
+
+		return
+	}
+}
+
+func (d *DelayedCombiningInvoker) CancelPendingRequests() {
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+
+	syncext.WriteNonBlocking(d.cancelChan, true)
+}
+
+func (d *DelayedCombiningInvoker) HasPendingRequests() bool {
+	return d.executorRunning.Get()
+}
+
+func (d *DelayedCombiningInvoker) CountPendingRequests() int {
+	return d.pendingRequests.Get()
+}
+
+func (d *DelayedCombiningInvoker) ExecuteNow() bool {
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+
+	if d.executorRunning.Get() {
+		syncext.WriteNonBlocking(d.execNowChan, true)
+		return true
+	} else {
+		return false
+	}
+}
+
+func (d *DelayedCombiningInvoker) WaitForCompletion(ctx context.Context) error {
+	return d.executorRunning.WaitWithContext(ctx, false)
+}
+
+func (d *DelayedCombiningInvoker) RegisterOnExecutionStart(fn func(immediately bool)) {
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+	d.onExecutionStart = append(d.onExecutionStart, fn)
+}
+
+func (d *DelayedCombiningInvoker) RegisterOnExecutionDone(fn func()) {
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+	d.onExecutionDone = append(d.onExecutionDone, fn)
+}
+
+func (d *DelayedCombiningInvoker) RegisterOnRequest(fn func(pending int, initial bool)) {
+	d.syncLock.Lock()
+	defer d.syncLock.Unlock()
+	d.onRequest = append(d.onRequest, fn)
+}

dataext/lruMap_test.go

@@ -1,7 +1,7 @@
 package dataext
 
 import (
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
 	"math/rand"
 	"strconv"
 	"testing"

dataext/merge_test.go

@@ -1,7 +1,8 @@
 package dataext
 
 import (
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
 	"testing"
 )
 
@@ -43,10 +44,10 @@ func TestObjectMerge(t *testing.T) {
 
 	valueMerge := ObjectMerge(valueA, valueB)
 
-	assertPtrEqual(t, "Field1", valueMerge.Field1, valueB.Field1)
+	tst.AssertIdentPtrEqual(t, "Field1", valueMerge.Field1, valueB.Field1)
-	assertPtrEqual(t, "Field2", valueMerge.Field2, valueA.Field2)
+	tst.AssertIdentPtrEqual(t, "Field2", valueMerge.Field2, valueA.Field2)
-	assertPtrEqual(t, "Field3", valueMerge.Field3, valueB.Field3)
+	tst.AssertIdentPtrEqual(t, "Field3", valueMerge.Field3, valueB.Field3)
-	assertPtrEqual(t, "Field4", valueMerge.Field4, nil)
+	tst.AssertIdentPtrEqual(t, "Field4", valueMerge.Field4, nil)
 
 }
 

dataext/multiMutex.go

@@ -0,0 +1,105 @@
+package dataext
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+// MultiMutex is a simple map[key -> mutex]
+type MultiMutex[TKey comparable] struct {
+	mutextMap *SyncMap[TKey, *CASMutex]
+}
+
+func NewMultiMutex[TKey comparable]() *MultiMutex[TKey] {
+	return &MultiMutex[TKey]{
+		mutextMap: NewSyncMap[TKey, *CASMutex](),
+	}
+}
+
+// TryLockWithContext attempts to acquire the lock, blocking until resources
+// are available or ctx is done (timeout or cancellation).
+func (mm *MultiMutex[TKey]) TryLockWithContext(ctx context.Context, key TKey) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.TryLockWithContext(ctx)
+}
+
+// Lock acquires the lock.
+// If it is currently held by others, Lock will wait until it has a chance to acquire it.
+func (mm *MultiMutex[TKey]) Lock(key TKey) {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	lck.Lock()
+}
+
+// TryLock attempts to acquire the lock without blocking.
+// Return false if someone is holding it now.
+func (mm *MultiMutex[TKey]) TryLock(key TKey) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.TryLock()
+}
+
+// TryLockWithTimeout attempts to acquire the lock within a period of time.
+// Return false if spending time is more than duration and no chance to acquire it.
+func (mm *MultiMutex[TKey]) TryLockWithTimeout(key TKey, duration time.Duration) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.TryLockWithTimeout(duration)
+}
+
+// Unlock releases the lock.
+func (mm *MultiMutex[TKey]) Unlock(key TKey) {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	lck.Unlock()
+}
+
+// RTryLockWithContext attempts to acquire the read lock, blocking until resources
+// are available or ctx is done (timeout or cancellation).
+func (mm *MultiMutex[TKey]) RTryLockWithContext(ctx context.Context, key TKey) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.RTryLockWithContext(ctx)
+}
+
+// RLock acquires the read lock.
+// If it is currently held by others writing, RLock will wait until it has a chance to acquire it.
+func (mm *MultiMutex[TKey]) RLock(key TKey) {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	lck.RLock()
+}
+
+// RTryLock attempts to acquire the read lock without blocking.
+// Return false if someone is writing it now.
+func (mm *MultiMutex[TKey]) RTryLock(key TKey) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.RTryLock()
+}
+
+// RTryLockWithTimeout attempts to acquire the read lock within a period of time.
+// Return false if spending time is more than duration and no chance to acquire it.
+func (mm *MultiMutex[TKey]) RTryLockWithTimeout(duration time.Duration, key TKey) bool {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.RTryLockWithTimeout(duration)
+}
+
+// RUnlock releases the read lock.
+func (mm *MultiMutex[TKey]) RUnlock(key TKey) {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	lck.RUnlock()
+}
+
+// RLocker returns a Locker interface that implements the Lock and Unlock methods
+// by calling CASMutex.RLock and CASMutex.RUnlock.
+func (mm *MultiMutex[TKey]) RLocker(key TKey) sync.Locker {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck.RLocker()
+}
+
+// Get returns a Locker interface
+func (mm *MultiMutex[TKey]) Get(key TKey) sync.Locker {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck
+}
+
+// GetCAS returns the underlying CASMutex
+func (mm *MultiMutex[TKey]) GetCAS(key TKey) *CASMutex {
+	lck := mm.mutextMap.GetAndSetIfNotContainsFunc(key, NewCASMutex)
+	return lck
+}

dataext/mutexSet.go

@@ -0,0 +1,53 @@
+package dataext
+
+import "sync"
+
+type MutexSet[T comparable] struct {
+	master sync.RWMutex
+	locks  map[T]*sync.RWMutex
+}
+
+func NewMutexSet[T comparable]() *MutexSet[T] {
+	return &MutexSet[T]{
+		master: sync.RWMutex{},
+		locks:  make(map[T]*sync.RWMutex),
+	}
+}
+
+func (ms *MutexSet[T]) get(key T) *sync.RWMutex {
+	ms.master.RLock()
+	if v, ok := ms.locks[key]; ok {
+		ms.master.RUnlock()
+		return v
+	}
+	ms.master.RUnlock()
+
+	// ---------
+
+	ms.master.Lock()
+	defer ms.master.Unlock()
+
+	if v, ok := ms.locks[key]; ok {
+		return v
+	}
+
+	m := &sync.RWMutex{}
+	ms.locks[key] = m
+	return m
+}
+
+func (ms *MutexSet[T]) Lock(key T) {
+	ms.get(key).Lock()
+}
+
+func (ms *MutexSet[T]) Unlock(key T) {
+	ms.get(key).Unlock()
+}
+
+func (ms *MutexSet[T]) RLock(key T) {
+	ms.get(key).RLock()
+}
+
+func (ms *MutexSet[T]) RUnlock(key T) {
+	ms.get(key).RUnlock()
+}

dataext/optional.go

@@ -0,0 +1,83 @@
+package dataext
+
+import (
+	"encoding/json"
+	"errors"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type JsonOpt[T any] struct {
+	isSet bool
+	value T
+}
+
+func NewJsonOpt[T any](v T) JsonOpt[T] {
+	return JsonOpt[T]{isSet: true, value: v}
+}
+
+func EmptyJsonOpt[T any]() JsonOpt[T] {
+	return JsonOpt[T]{isSet: false}
+}
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m JsonOpt[T]) MarshalJSON() ([]byte, error) {
+	if !m.isSet {
+		return []byte("null"), nil // actually this would be undefined - but undefined is not valid JSON
+	}
+
+	return json.Marshal(m.value)
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *JsonOpt[T]) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("JsonOpt: UnmarshalJSON on nil pointer")
+	}
+
+	m.isSet = true
+	return json.Unmarshal(data, &m.value)
+}
+
+func (m JsonOpt[T]) IsSet() bool {
+	return m.isSet
+}
+
+func (m JsonOpt[T]) IsUnset() bool {
+	return !m.isSet
+}
+
+func (m JsonOpt[T]) Value() (T, bool) {
+	if !m.isSet {
+		return *new(T), false
+	}
+	return m.value, true
+}
+
+func (m JsonOpt[T]) ValueOrNil() *T {
+	if !m.isSet {
+		return nil
+	}
+	return &m.value
+}
+
+func (m JsonOpt[T]) ValueDblPtrOrNil() **T {
+	if !m.isSet {
+		return nil
+	}
+	return langext.DblPtr(m.value)
+}
+
+func (m JsonOpt[T]) MustValue() T {
+	if !m.isSet {
+		panic("value not set")
+	}
+	return m.value
+}
+
+func (m JsonOpt[T]) IfSet(fn func(v T)) bool {
+	if !m.isSet {
+		return false
+	}
+	fn(m.value)
+	return true
+}

dataext/pubsub.go

@@ -0,0 +1,267 @@
+package dataext
+
+import (
+	"context"
+	"iter"
+	"sync"
+	"time"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/syncext"
+	"github.com/rs/xid"
+)
+
+// PubSub is a simple Pub/Sub Broker
+// Clients can subscribe to a namespace and receive published messages on this namespace
+// Messages are broadcast to all subscribers
+type PubSub[TNamespace comparable, TData any] struct {
+	masterLock *sync.Mutex
+
+	subscriptions map[TNamespace][]*pubSubSubscription[TNamespace, TData]
+}
+
+type PubSubSubscription interface {
+	Unsubscribe()
+}
+
+type pubSubSubscription[TNamespace comparable, TData any] struct {
+	ID string
+
+	parent    *PubSub[TNamespace, TData]
+	namespace TNamespace
+
+	subLock *sync.Mutex
+
+	Func func(TData)
+	Chan chan TData
+
+	UnsubChan chan bool
+}
+
+func (p *pubSubSubscription[TNamespace, TData]) Unsubscribe() {
+	p.parent.unsubscribe(p)
+}
+
+func NewPubSub[TNamespace comparable, TData any](capacity int) *PubSub[TNamespace, TData] {
+	return &PubSub[TNamespace, TData]{
+		masterLock:    &sync.Mutex{},
+		subscriptions: make(map[TNamespace][]*pubSubSubscription[TNamespace, TData], capacity),
+	}
+}
+
+func (ps *PubSub[TNamespace, TData]) Namespaces() []TNamespace {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	return langext.MapKeyArr(ps.subscriptions)
+}
+
+func (ps *PubSub[TNamespace, TData]) SubscriberCount(ns TNamespace) int {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	return len(ps.subscriptions[ns])
+}
+
+// Publish sends `data` to all subscriber
+// But unbuffered - if one is currently not listening, we skip (the actualReceiver < subscriber)
+func (ps *PubSub[TNamespace, TData]) Publish(ns TNamespace, data TData) (subscriber int, actualReceiver int) {
+	ps.masterLock.Lock()
+	subs := langext.ArrCopy(ps.subscriptions[ns])
+	ps.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		func() {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				msgSent := syncext.WriteNonBlocking(sub.Chan, data)
+				if msgSent {
+					actualReceiver++
+				}
+			}
+		}()
+	}
+
+	return subscriber, actualReceiver
+}
+
+// PublishWithContext sends `data` to all subscriber
+// buffered - if one is currently not listening, we wait (but error out when the context runs out)
+func (ps *PubSub[TNamespace, TData]) PublishWithContext(ctx context.Context, ns TNamespace, data TData) (subscriber int, actualReceiver int, err error) {
+	ps.masterLock.Lock()
+	subs := langext.ArrCopy(ps.subscriptions[ns])
+	ps.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		err := func() error {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				err := syncext.WriteChannelWithContext(ctx, sub.Chan, data)
+				if err != nil {
+					return err
+				}
+				actualReceiver++
+			}
+
+			return nil
+		}()
+		if err != nil {
+			return subscriber, actualReceiver, err
+		}
+	}
+
+	return subscriber, actualReceiver, nil
+}
+
+// PublishWithTimeout sends `data` to all subscriber
+// buffered - if one is currently not listening, we wait (but wait at most `timeout` - if the timeout is exceeded then actualReceiver < subscriber)
+func (ps *PubSub[TNamespace, TData]) PublishWithTimeout(ns TNamespace, data TData, timeout time.Duration) (subscriber int, actualReceiver int) {
+	ps.masterLock.Lock()
+	subs := langext.ArrCopy(ps.subscriptions[ns])
+	ps.masterLock.Unlock()
+
+	subscriber = len(subs)
+	actualReceiver = 0
+
+	for _, sub := range subs {
+		func() {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+				actualReceiver++
+			} else if sub.Chan != nil {
+				ok := syncext.WriteChannelWithTimeout(sub.Chan, data, timeout)
+				if ok {
+					actualReceiver++
+				}
+			}
+		}()
+	}
+
+	return subscriber, actualReceiver
+}
+
+// PublishAsync sends `data` to all subscriber
+// does not wait for subscriber (this method returns immediately), waits at most {timeout} seconds on channels (async)
+func (ps *PubSub[TNamespace, TData]) PublishAsync(ns TNamespace, data TData, timeout time.Duration) (subscriber int) {
+	ps.masterLock.Lock()
+	subs := langext.ArrCopy(ps.subscriptions[ns])
+	ps.masterLock.Unlock()
+
+	subscriber = len(subs)
+
+	for _, sub := range subs {
+		func() {
+			sub.subLock.Lock()
+			defer sub.subLock.Unlock()
+
+			if sub.Func != nil {
+				go func() { sub.Func(data) }()
+			} else if sub.Chan != nil {
+				go func() { _ = syncext.WriteChannelWithTimeout(sub.Chan, data, timeout) }()
+			}
+		}()
+	}
+
+	return subscriber
+}
+
+func (ps *PubSub[TNamespace, TData]) SubscribeByCallback(ns TNamespace, fn func(TData)) PubSubSubscription {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	sub := &pubSubSubscription[TNamespace, TData]{ID: xid.New().String(), namespace: ns, parent: ps, subLock: &sync.Mutex{}, Func: fn, UnsubChan: nil}
+
+	ps.subscriptions[ns] = append(ps.subscriptions[ns], sub)
+
+	return sub
+}
+
+func (ps *PubSub[TNamespace, TData]) SubscribeByChan(ns TNamespace, chanBufferSize int) (chan TData, PubSubSubscription) {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	msgCh := make(chan TData, chanBufferSize)
+
+	sub := &pubSubSubscription[TNamespace, TData]{ID: xid.New().String(), namespace: ns, parent: ps, subLock: &sync.Mutex{}, Chan: msgCh, UnsubChan: nil}
+
+	ps.subscriptions[ns] = append(ps.subscriptions[ns], sub)
+
+	return msgCh, sub
+}
+
+func (ps *PubSub[TNamespace, TData]) SubscribeByIter(ns TNamespace, chanBufferSize int) (iter.Seq[TData], PubSubSubscription) {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	msgCh := make(chan TData, chanBufferSize)
+	unsubChan := make(chan bool, 8)
+
+	sub := &pubSubSubscription[TNamespace, TData]{ID: xid.New().String(), namespace: ns, parent: ps, subLock: &sync.Mutex{}, Chan: msgCh, UnsubChan: unsubChan}
+
+	ps.subscriptions[ns] = append(ps.subscriptions[ns], sub)
+
+	iterFun := func(yield func(TData) bool) {
+		for {
+			select {
+			case msg := <-msgCh:
+				if !yield(msg) {
+					sub.Unsubscribe()
+					return
+				}
+			case <-sub.UnsubChan:
+				sub.Unsubscribe()
+				return
+			}
+		}
+	}
+
+	return iterFun, sub
+}
+
+func (ps *PubSub[TNamespace, TData]) unsubscribe(p *pubSubSubscription[TNamespace, TData]) {
+	ps.masterLock.Lock()
+	defer ps.masterLock.Unlock()
+
+	p.subLock.Lock()
+	defer p.subLock.Unlock()
+
+	if p.Chan != nil {
+		close(p.Chan)
+		p.Chan = nil
+	}
+	if p.UnsubChan != nil {
+		syncext.WriteNonBlocking(p.UnsubChan, true)
+		close(p.UnsubChan)
+		p.UnsubChan = nil
+	}
+
+	ps.subscriptions[p.namespace] = langext.ArrFilter(ps.subscriptions[p.namespace], func(v *pubSubSubscription[TNamespace, TData]) bool {
+		return v.ID != p.ID
+	})
+	if len(ps.subscriptions[p.namespace]) == 0 {
+		delete(ps.subscriptions, p.namespace)
+	}
+}

dataext/pubsub_test.go

@@ -0,0 +1,428 @@
+package dataext
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestNewPubSub(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+	if ps == nil {
+		t.Fatal("NewPubSub returned nil")
+	}
+	if ps.masterLock == nil {
+		t.Fatal("masterLock is nil")
+	}
+	if ps.subscriptions == nil {
+		t.Fatal("subscriptions is nil")
+	}
+}
+
+func TestPubSub_Namespaces(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Initially no namespaces
+	namespaces := ps.Namespaces()
+	if len(namespaces) != 0 {
+		t.Fatalf("Expected 0 namespaces, got %d", len(namespaces))
+	}
+
+	// Add a subscription to create a namespace
+	_, sub1 := ps.SubscribeByChan("test-ns1", 1)
+	defer sub1.Unsubscribe()
+
+	// Add another subscription to a different namespace
+	_, sub2 := ps.SubscribeByChan("test-ns2", 1)
+	defer sub2.Unsubscribe()
+
+	// Check namespaces
+	namespaces = ps.Namespaces()
+	if len(namespaces) != 2 {
+		t.Fatalf("Expected 2 namespaces, got %d", len(namespaces))
+	}
+
+	// Check if namespaces contain the expected values
+	found1, found2 := false, false
+	for _, ns := range namespaces {
+		if ns == "test-ns1" {
+			found1 = true
+		}
+		if ns == "test-ns2" {
+			found2 = true
+		}
+	}
+
+	if !found1 || !found2 {
+		t.Fatalf("Expected to find both namespaces, found ns1: %v, ns2: %v", found1, found2)
+	}
+}
+
+func TestPubSub_SubscribeByCallback(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	var received string
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	callback := func(msg string) {
+		received = msg
+		wg.Done()
+	}
+
+	sub := ps.SubscribeByCallback("test-ns", callback)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers := ps.Publish("test-ns", "hello")
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Wait for the callback to be executed
+	wg.Wait()
+
+	if received != "hello" {
+		t.Fatalf("Expected to receive 'hello', got '%s'", received)
+	}
+}
+
+func TestPubSub_SubscribeByChan(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	ch, sub := ps.SubscribeByChan("test-ns", 1)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers := ps.Publish("test-ns", "hello")
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Read from the channel with a timeout to avoid blocking
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+}
+
+func TestPubSub_SubscribeByIter(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	iterSeq, sub := ps.SubscribeByIter("test-ns", 1)
+	defer sub.Unsubscribe()
+
+	// Channel to communicate when message is received
+	done := make(chan bool)
+	received := false
+
+	// Start a goroutine to use the iterator
+	go func() {
+		for msg := range iterSeq {
+			if msg == "hello" {
+				received = true
+				done <- true
+				return // Stop iteration
+			}
+		}
+	}()
+
+	// Give time for the iterator to start
+	time.Sleep(100 * time.Millisecond)
+
+	// Publish a message
+	ps.Publish("test-ns", "hello")
+
+	// Wait for the message to be received or timeout
+	select {
+	case <-done:
+		if !received {
+			t.Fatal("Message was received but not 'hello'")
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	subCount := ps.SubscriberCount("test-ns")
+	if subCount != 0 {
+		t.Fatalf("Expected 0 receivers, got %d", subCount)
+	}
+}
+
+func TestPubSub_Publish(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Test publishing to a namespace with no subscribers
+	subs, receivers := ps.Publish("empty-ns", "hello")
+	if subs != 0 {
+		t.Fatalf("Expected 0 subscribers, got %d", subs)
+	}
+	if receivers != 0 {
+		t.Fatalf("Expected 0 receivers, got %d", receivers)
+	}
+
+	// Add a subscriber
+	ch, sub := ps.SubscribeByChan("test-ns", 1)
+	defer sub.Unsubscribe()
+
+	// Publish a message
+	subs, receivers = ps.Publish("test-ns", "hello")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Test non-blocking behavior with a full channel
+	// First fill the channel
+	ps.Publish("test-ns", "fill")
+
+	// Now publish again - this should not block but skip the receiver
+	subs, receivers = ps.Publish("test-ns", "overflow")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	// The receiver count might be 0 if the channel is full
+
+	// Drain the channel
+	<-ch
+}
+
+func TestPubSub_PublishWithTimeout(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Add a subscriber with a channel
+	ch, sub := ps.SubscribeByChan("test-ns", 1)
+	defer sub.Unsubscribe()
+
+	// Publish with a timeout
+	subs, receivers := ps.PublishWithTimeout("test-ns", "hello", 100*time.Millisecond)
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Fill the channel
+	ps.Publish("test-ns", "fill")
+
+	// Test timeout behavior with a full channel
+	start := time.Now()
+	subs, receivers = ps.PublishWithTimeout("test-ns", "timeout-test", 50*time.Millisecond)
+	elapsed := time.Since(start)
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	// The receiver count should be 0 if the timeout occurred
+	if elapsed < 50*time.Millisecond {
+		t.Fatalf("Expected to wait at least 50ms, only waited %v", elapsed)
+	}
+
+	// Drain the channel
+	<-ch
+}
+
+func TestPubSub_PublishWithContext(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Add a subscriber with a channel
+	ch, sub := ps.SubscribeByChan("test-ns", 1)
+	defer sub.Unsubscribe()
+
+	// Create a context
+	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+
+	// Publish with context
+	subs, receivers, err := ps.PublishWithContext(ctx, "test-ns", "hello")
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Fill the channel
+	ps.Publish("test-ns", "fill")
+
+	// Test context cancellation with a full channel
+	ctx, cancel = context.WithCancel(context.Background())
+
+	// Cancel the context after a short delay
+	go func() {
+		time.Sleep(50 * time.Millisecond)
+		cancel()
+	}()
+
+	start := time.Now()
+	subs, receivers, err = ps.PublishWithContext(ctx, "test-ns", "context-test")
+	elapsed := time.Since(start)
+
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+
+	// Should get a context canceled error
+	if err == nil {
+		t.Fatal("Expected context canceled error, got nil")
+	}
+
+	if elapsed < 50*time.Millisecond {
+		t.Fatalf("Expected to wait at least 50ms, only waited %v", elapsed)
+	}
+
+	// Drain the channel
+	<-ch
+}
+
+func TestPubSub_Unsubscribe(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Add a subscriber
+	ch, sub := ps.SubscribeByChan("test-ns", 1)
+
+	// Publish a message
+	subs, receivers := ps.Publish("test-ns", "hello")
+	if subs != 1 {
+		t.Fatalf("Expected 1 subscriber, got %d", subs)
+	}
+	if receivers != 1 {
+		t.Fatalf("Expected 1 receiver, got %d", receivers)
+	}
+
+	// Verify the message was received
+	select {
+	case msg := <-ch:
+		if msg != "hello" {
+			t.Fatalf("Expected to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message")
+	}
+
+	// Unsubscribe
+	sub.Unsubscribe()
+
+	// Publish again
+	subs, receivers = ps.Publish("test-ns", "after-unsub")
+	if subs != 0 {
+		t.Fatalf("Expected 0 subscribers after unsubscribe, got %d", subs)
+	}
+	if receivers != 0 {
+		t.Fatalf("Expected 0 receivers after unsubscribe, got %d", receivers)
+	}
+
+	// Check that the namespace is removed
+	namespaces := ps.Namespaces()
+	if len(namespaces) != 0 {
+		t.Fatalf("Expected 0 namespaces after unsubscribe, got %d", len(namespaces))
+	}
+}
+
+func TestPubSub_MultipleSubscribers(t *testing.T) {
+	ps := NewPubSub[string, string](10)
+
+	// Add multiple subscribers
+	ch1, sub1 := ps.SubscribeByChan("test-ns", 1)
+	defer sub1.Unsubscribe()
+
+	ch2, sub2 := ps.SubscribeByChan("test-ns", 1)
+	defer sub2.Unsubscribe()
+
+	var received string
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	sub3 := ps.SubscribeByCallback("test-ns", func(msg string) {
+		received = msg
+		wg.Done()
+	})
+	defer sub3.Unsubscribe()
+
+	// Publish a message
+	subs, receivers := ps.Publish("test-ns", "hello")
+	if subs != 3 {
+		t.Fatalf("Expected 3 subscribers, got %d", subs)
+	}
+	if receivers != 3 {
+		t.Fatalf("Expected 3 receivers, got %d", receivers)
+	}
+
+	// Verify the message was received by all subscribers
+	select {
+	case msg := <-ch1:
+		if msg != "hello" {
+			t.Fatalf("Expected ch1 to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message on ch1")
+	}
+
+	select {
+	case msg := <-ch2:
+		if msg != "hello" {
+			t.Fatalf("Expected ch2 to receive 'hello', got '%s'", msg)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Timed out waiting for message on ch2")
+	}
+
+	// Wait for the callback
+	wg.Wait()
+
+	if received != "hello" {
+		t.Fatalf("Expected callback to receive 'hello', got '%s'", received)
+	}
+}

dataext/ringBuffer.go

@@ -0,0 +1,144 @@
+package dataext
+
+import "iter"
+
+type RingBuffer[T any] struct {
+	items    []T //
+	capacity int // max number of items the buffer can hold
+	size     int // how many items are in the buffer
+	head     int // ptr to next item
+}
+
+func NewRingBuffer[T any](capacity int) *RingBuffer[T] {
+	return &RingBuffer[T]{
+		items:    make([]T, capacity),
+		capacity: capacity,
+		size:     0,
+		head:     0,
+	}
+}
+
+func (rb *RingBuffer[T]) Push(item T) {
+	if rb.size < rb.capacity {
+		rb.size++
+	}
+	rb.items[rb.head] = item
+	rb.head = (rb.head + 1) % rb.capacity
+}
+
+func (rb *RingBuffer[T]) PushPop(item T) *T {
+	if rb.size < rb.capacity {
+		rb.size++
+		rb.items[rb.head] = item
+		rb.head = (rb.head + 1) % rb.capacity
+		return nil
+	} else {
+		prev := rb.items[rb.head]
+		rb.items[rb.head] = item
+		rb.head = (rb.head + 1) % rb.capacity
+		return &prev
+	}
+}
+
+func (rb *RingBuffer[T]) Peek() (T, bool) {
+	if rb.size == 0 {
+		return *new(T), false
+	}
+	return rb.items[(rb.head-1+rb.capacity)%rb.capacity], true
+}
+
+func (rb *RingBuffer[T]) Items() []T {
+	if rb.size < rb.capacity {
+		return rb.items[:rb.size]
+	}
+	return append(rb.items[rb.head:], rb.items[:rb.head]...)
+}
+
+func (rb *RingBuffer[T]) Size() int {
+	return rb.size
+}
+
+func (rb *RingBuffer[T]) Capacity() int {
+	return rb.capacity
+}
+
+func (rb *RingBuffer[T]) Clear() {
+	rb.size = 0
+	rb.head = 0
+}
+
+func (rb *RingBuffer[T]) IsFull() bool {
+	return rb.size == rb.capacity
+}
+
+func (rb *RingBuffer[T]) At(i int) T {
+	if i < 0 || i >= rb.size {
+		panic("Index out of bounds")
+	}
+	if rb.size < rb.capacity {
+		return rb.items[i]
+	}
+	return rb.items[(rb.head+i)%rb.capacity]
+}
+
+func (rb *RingBuffer[T]) Get(i int) (T, bool) {
+	if i < 0 || i >= rb.size {
+		return *new(T), false
+	}
+	if rb.size < rb.capacity {
+		return rb.items[i], true
+	}
+	return rb.items[(rb.head+i)%rb.capacity], true
+}
+
+func (rb *RingBuffer[T]) Iter() iter.Seq[T] {
+	return func(yield func(T) bool) {
+		for i := 0; i < rb.size; i++ {
+			if !yield(rb.At(i)) {
+				return
+			}
+		}
+	}
+}
+
+func (rb *RingBuffer[T]) Iter2() iter.Seq2[int, T] {
+	return func(yield func(int, T) bool) {
+		for i := 0; i < rb.size; i++ {
+			if !yield(i, rb.At(i)) {
+				return
+			}
+		}
+	}
+}
+
+func (rb *RingBuffer[T]) Remove(fnEqual func(v T) bool) int {
+	// Mike [2024-11-13]: I *really* tried to write an in-place algorithm to remove elements
+	//                    But after carful consideration, I left that as an exercise for future readers
+	//                    It is, suprisingly, non-trivial, especially because the head-ptr must be weirdly updated
+	//                    And out At() method does not work correctly with {head<>0 && size<capacity}
+
+	dc := 0
+	b := make([]T, rb.capacity)
+	bsize := 0
+
+	for i := 0; i < rb.size; i++ {
+		comp := rb.At(i)
+		if fnEqual(comp) {
+			dc++
+		} else {
+			b[bsize] = comp
+			bsize++
+		}
+	}
+
+	if dc == 0 {
+		return 0
+	}
+
+	rb.items = b
+	rb.size = bsize
+	rb.head = bsize % rb.capacity
+
+	return dc
+
+}

dataext/ringBuffer_test.go

@@ -0,0 +1,447 @@
+package dataext
+
+import "testing"
+
+func TestRingBufferPushAddsItem(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	if rb.Size() != 1 {
+		t.Errorf("Expected size 1, got %d", rb.Size())
+	}
+	if item, _ := rb.Peek(); item != 1 {
+		t.Errorf("Expected item 1, got %d", item)
+	}
+}
+
+func TestRingBufferPushPopReturnsOldestItem(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	if item := rb.PushPop(4); item == nil || *item != 1 {
+		t.Errorf("Expected item 1, got %v", item)
+	}
+}
+
+func TestRingBufferPeekReturnsLastPushedItem(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	if item, _ := rb.Peek(); item != 2 {
+		t.Errorf("Expected item 2, got %d", item)
+	}
+}
+
+func TestRingBufferOverflow1(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1) // overriden
+	rb.Push(2) // overriden
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	rb.Push(5)
+	rb.Push(7)
+	if rb.Size() != 5 {
+		t.Errorf("Expected size 4, got %d", rb.Size())
+	}
+	expected := []int{3, 9, 4, 5, 7}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferItemsReturnsAllItems(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	items := rb.Items()
+	expected := []int{1, 2, 3}
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferClearEmptiesBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Clear()
+	if rb.Size() != 0 {
+		t.Errorf("Expected size 0, got %d", rb.Size())
+	}
+}
+
+func TestRingBufferIsFullReturnsTrueWhenFull(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	if !rb.IsFull() {
+		t.Errorf("Expected buffer to be full")
+	}
+}
+
+func TestRingBufferAtReturnsCorrectItem(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	if item := rb.At(1); item != 2 {
+		t.Errorf("Expected item 2, got %d", item)
+	}
+}
+
+func TestRingBufferGetReturnsCorrectItem(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	if item, ok := rb.Get(1); !ok || item != 2 {
+		t.Errorf("Expected item 2, got %d", item)
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	rb.Push(2)
+	rb.Push(4)
+	removed := rb.Remove(func(v int) bool { return v == 2 })
+	if removed != 2 {
+		t.Errorf("Expected 2 items removed, got %d", removed)
+	}
+	if rb.Size() != 3 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+	expected := []int{1, 3, 4}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems2(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	rb.Push(2)
+	rb.Push(4)
+	removed := rb.Remove(func(v int) bool { return v == 3 })
+	if removed != 1 {
+		t.Errorf("Expected 2 items removed, got %d", removed)
+	}
+	if rb.Size() != 4 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+	expected := []int{1, 2, 2, 4}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems3(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	removed := rb.Remove(func(v int) bool { return v == 3 })
+	if removed != 1 {
+		t.Errorf("Expected 2 items removed, got %d", removed)
+	}
+	if rb.Size() != 4 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+	expected := []int{1, 2, 9, 4}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems4(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1) // overriden
+	rb.Push(2) // overriden
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	rb.Push(5)
+	rb.Push(7)
+	removed := rb.Remove(func(v int) bool { return v == 7 })
+	if removed != 1 {
+		t.Errorf("Expected 1 items removed, got %d", removed)
+	}
+	if rb.Size() != 4 {
+		t.Errorf("Expected size 4, got %d", rb.Size())
+	}
+	expected := []int{3, 9, 4, 5}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems5(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1) // overriden
+	rb.Push(2) // overriden
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	rb.Push(5)
+	rb.Push(7)
+	removed := rb.Remove(func(v int) bool { return v == 3 })
+	if removed != 1 {
+		t.Errorf("Expected 1 items removed, got %d", removed)
+	}
+	if rb.Size() != 4 {
+		t.Errorf("Expected size 4, got %d", rb.Size())
+	}
+	expected := []int{9, 4, 5, 7}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems6(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1) // overriden
+	rb.Push(2) // overriden
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	rb.Push(5)
+	rb.Push(7)
+	removed := rb.Remove(func(v int) bool { return v == 1 })
+	if removed != 0 {
+		t.Errorf("Expected 0 items removed, got %d", removed)
+	}
+	if rb.Size() != 5 {
+		t.Errorf("Expected size 5, got %d", rb.Size())
+	}
+	expected := []int{3, 9, 4, 5, 7}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+	if !rb.IsFull() {
+		t.Errorf("Expected buffer to not be full")
+	}
+}
+
+func TestRingBufferRemoveDeletesMatchingItems7(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1) // overriden
+	rb.Push(2) // overriden
+	rb.Push(3)
+	rb.Push(9)
+	rb.Push(4)
+	rb.Push(5)
+	rb.Push(7)
+	removed := rb.Remove(func(v int) bool { return v == 9 })
+	if removed != 1 {
+		t.Errorf("Expected 1 items removed, got %d", removed)
+	}
+	if rb.Size() != 4 {
+		t.Errorf("Expected size 4, got %d", rb.Size())
+	}
+	expected := []int{3, 4, 5, 7}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+	if rb.IsFull() {
+		t.Errorf("Expected buffer to not be full")
+	}
+}
+
+func TestRingBufferAddItemsToFullRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	rb.Push(4)
+	if rb.Size() != 3 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+	expected := []int{2, 3, 4}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferAddItemsToNonFullRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	if rb.Size() != 2 {
+		t.Errorf("Expected size 2, got %d", rb.Size())
+	}
+	expected := []int{1, 2}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveItemsFromNonFullRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	removed := rb.Remove(func(v int) bool { return v == 1 })
+	if removed != 1 {
+		t.Errorf("Expected 1 item removed, got %d", removed)
+	}
+	if rb.Size() != 1 {
+		t.Errorf("Expected size 1, got %d", rb.Size())
+	}
+	expected := []int{2}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveItemsFromFullRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	removed := rb.Remove(func(v int) bool { return v == 2 })
+	if removed != 1 {
+		t.Errorf("Expected 1 item removed, got %d", removed)
+	}
+	if rb.Size() != 2 {
+		t.Errorf("Expected size 2, got %d", rb.Size())
+	}
+	expected := []int{1, 3}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveMultipleItemsFromRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](5)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	rb.Push(2)
+	rb.Push(4)
+	removed := rb.Remove(func(v int) bool { return v == 2 })
+	if removed != 2 {
+		t.Errorf("Expected 2 items removed, got %d", removed)
+	}
+	if rb.Size() != 3 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+	expected := []int{1, 3, 4}
+	items := rb.Items()
+	for i, item := range items {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+	}
+}
+
+func TestRingBufferRemoveAllItemsFromRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	removed := rb.Remove(func(v int) bool { return true })
+	if removed != 3 {
+		t.Errorf("Expected 3 items removed, got %d", removed)
+	}
+	if rb.Size() != 0 {
+		t.Errorf("Expected size 0, got %d", rb.Size())
+	}
+}
+
+func TestRingBufferRemoveNoItemsFromRingBuffer(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	removed := rb.Remove(func(v int) bool { return false })
+	if removed != 0 {
+		t.Errorf("Expected 0 items removed, got %d", removed)
+	}
+	if rb.Size() != 3 {
+		t.Errorf("Expected size 3, got %d", rb.Size())
+	}
+}
+
+func TestRingBufferIteratesOverAllItems(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	expected := []int{1, 2, 3}
+	i := 0
+	for item := range rb.Iter() {
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+		i++
+	}
+	if i != len(expected) {
+		t.Errorf("Expected to iterate over %d items, but iterated over %d", len(expected), i)
+	}
+}
+
+func TestRingBufferIter2IteratesOverAllItemsWithIndices(t *testing.T) {
+	rb := NewRingBuffer[int](3)
+	rb.Push(1)
+	rb.Push(2)
+	rb.Push(3)
+	expected := []int{1, 2, 3}
+	i := 0
+	for index, item := range rb.Iter2() {
+		if index != i {
+			t.Errorf("Expected index %d, got %d", i, index)
+		}
+		if item != expected[i] {
+			t.Errorf("Expected item %d, got %d", expected[i], item)
+		}
+		i++
+	}
+	if i != len(expected) {
+		t.Errorf("Expected to iterate over %d items, but iterated over %d", len(expected), i)
+	}
+}

dataext/stack.go

@@ -2,7 +2,7 @@ package dataext
 
 import (
 	"errors"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
 	"sync"
 )
 

dataext/structHash.go

@@ -6,7 +6,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
 	"hash"
 	"io"
 	"reflect"

dataext/structHash_test.go

@@ -1,8 +1,8 @@
 package dataext
 
 import (
-	"encoding/hex"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
 	"testing"
 )
 
@@ -18,14 +18,14 @@ func noErrStructHash(t *testing.T, dat any, opt ...StructHashOptions) []byte {
 
 func TestStructHashSimple(t *testing.T) {
 
-	assertEqual(t, "209bf774af36cc3a045c152d9f1269ef3684ad819c1359ee73ff0283a308fefa", noErrStructHash(t, "Hello"))
+	tst.AssertHexEqual(t, "209bf774af36cc3a045c152d9f1269ef3684ad819c1359ee73ff0283a308fefa", noErrStructHash(t, "Hello"))
-	assertEqual(t, "c32f3626b981ae2997db656f3acad3f1dc9d30ef6b6d14296c023e391b25f71a", noErrStructHash(t, 0))
+	tst.AssertHexEqual(t, "c32f3626b981ae2997db656f3acad3f1dc9d30ef6b6d14296c023e391b25f71a", noErrStructHash(t, 0))
-	assertEqual(t, "01b781b03e9586b257d387057dfc70d9f06051e7d3c1e709a57e13cc8daf3e35", noErrStructHash(t, []byte{}))
+	tst.AssertHexEqual(t, "01b781b03e9586b257d387057dfc70d9f06051e7d3c1e709a57e13cc8daf3e35", noErrStructHash(t, []byte{}))
-	assertEqual(t, "93e1dcd45c732fe0079b0fb3204c7c803f0921835f6bfee2e6ff263e73eed53c", noErrStructHash(t, []int{}))
+	tst.AssertHexEqual(t, "93e1dcd45c732fe0079b0fb3204c7c803f0921835f6bfee2e6ff263e73eed53c", noErrStructHash(t, []int{}))
-	assertEqual(t, "54f637a376aad55b3160d98ebbcae8099b70d91b9400df23fb3709855d59800a", noErrStructHash(t, []int{1, 2, 3}))
+	tst.AssertHexEqual(t, "54f637a376aad55b3160d98ebbcae8099b70d91b9400df23fb3709855d59800a", noErrStructHash(t, []int{1, 2, 3}))
-	assertEqual(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", noErrStructHash(t, nil))
+	tst.AssertHexEqual(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", noErrStructHash(t, nil))
-	assertEqual(t, "349a7db91aa78fd30bbaa7c7f9c7bfb2fcfe72869b4861162a96713a852f60d3", noErrStructHash(t, []any{1, "", nil}))
+	tst.AssertHexEqual(t, "349a7db91aa78fd30bbaa7c7f9c7bfb2fcfe72869b4861162a96713a852f60d3", noErrStructHash(t, []any{1, "", nil}))
-	assertEqual(t, "ca51aab87808bf0062a4a024de6aac0c2bad54275cc857a4944569f89fd245ad", noErrStructHash(t, struct{}{}))
+	tst.AssertHexEqual(t, "ca51aab87808bf0062a4a024de6aac0c2bad54275cc857a4944569f89fd245ad", noErrStructHash(t, struct{}{}))
 
 }
 
@@ -37,13 +37,13 @@ func TestStructHashSimpleStruct(t *testing.T) {
 		F3 *int
 	}
 
-	assertEqual(t, "a90bff751c70c738bb5cfc9b108e783fa9c19c0bc9273458e0aaee6e74aa1b92", noErrStructHash(t, t0{
+	tst.AssertHexEqual(t, "a90bff751c70c738bb5cfc9b108e783fa9c19c0bc9273458e0aaee6e74aa1b92", noErrStructHash(t, t0{
 		F1: 10,
 		F2: []string{"1", "2", "3"},
 		F3: nil,
 	}))
 
-	assertEqual(t, "5d09090dc34ac59dd645f197a255f653387723de3afa1b614721ea5a081c675f", noErrStructHash(t, t0{
+	tst.AssertHexEqual(t, "5d09090dc34ac59dd645f197a255f653387723de3afa1b614721ea5a081c675f", noErrStructHash(t, t0{
 		F1: 10,
 		F2: []string{"1", "2", "3"},
 		F3: langext.Ptr(99),
@@ -64,7 +64,7 @@ func TestStructHashLayeredStruct(t *testing.T) {
 		SV3 t1_1
 	}
 
-	assertEqual(t, "fd4ca071fb40a288fee4b7a3dfdaab577b30cb8f80f81ec511e7afd72dc3b469", noErrStructHash(t, t1_2{
+	tst.AssertHexEqual(t, "fd4ca071fb40a288fee4b7a3dfdaab577b30cb8f80f81ec511e7afd72dc3b469", noErrStructHash(t, t1_2{
 		SV1: nil,
 		SV2: nil,
 		SV3: t1_1{
@@ -73,7 +73,7 @@ func TestStructHashLayeredStruct(t *testing.T) {
 			F15: false,
 		},
 	}))
-	assertEqual(t, "3fbf7c67d8121deda075cc86319a4e32d71744feb2cebf89b43bc682f072a029", noErrStructHash(t, t1_2{
+	tst.AssertHexEqual(t, "3fbf7c67d8121deda075cc86319a4e32d71744feb2cebf89b43bc682f072a029", noErrStructHash(t, t1_2{
 		SV1: nil,
 		SV2: &t1_1{},
 		SV3: t1_1{
@@ -82,7 +82,7 @@ func TestStructHashLayeredStruct(t *testing.T) {
 			F15: true,
 		},
 	}))
-	assertEqual(t, "b1791ccd1b346c3ede5bbffda85555adcd8216b93ffca23f14fe175ec47c5104", noErrStructHash(t, t1_2{
+	tst.AssertHexEqual(t, "b1791ccd1b346c3ede5bbffda85555adcd8216b93ffca23f14fe175ec47c5104", noErrStructHash(t, t1_2{
 		SV1: &t1_1{},
 		SV2: &t1_1{},
 		SV3: t1_1{
@@ -101,7 +101,7 @@ func TestStructHashMap(t *testing.T) {
 		F2 map[string]int
 	}
 
-	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+	tst.AssertHexEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
 		F1: 10,
 		F2: map[string]int{
 			"x": 1,
@@ -110,7 +110,7 @@ func TestStructHashMap(t *testing.T) {
 		},
 	}))
 
-	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+	tst.AssertHexEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
 		F1: 10,
 		F2: map[string]int{
 			"a": 99,
@@ -128,16 +128,9 @@ func TestStructHashMap(t *testing.T) {
 	m3["x"] = 1
 	m3["a"] = 2
 
-	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+	tst.AssertHexEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
 		F1: 10,
 		F2: m3,
 	}))
 
 }
-
-func assertEqual(t *testing.T, expected string, actual []byte) {
-	actualStr := hex.EncodeToString(actual)
-	if actualStr != expected {
-		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actualStr, expected)
-	}
-}

dataext/syncMap.go

@@ -0,0 +1,256 @@
+package dataext
+
+import "sync"
+
+// SyncMap is a thread-safe map implementation for generic key-value pairs.
+// All functions aresafe to be called in parallel.
+type SyncMap[TKey comparable, TData any] struct {
+	data map[TKey]TData
+	lock sync.Mutex
+}
+
+func NewSyncMap[TKey comparable, TData any]() *SyncMap[TKey, TData] {
+	return &SyncMap[TKey, TData]{data: make(map[TKey]TData), lock: sync.Mutex{}}
+}
+
+// Set sets the value for the provided key
+func (s *SyncMap[TKey, TData]) Set(key TKey, data TData) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	s.data[key] = data
+}
+
+// SetIfNotContains sets the value for the provided key if it does not already exist
+func (s *SyncMap[TKey, TData]) SetIfNotContains(key TKey, data TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if _, existsInPreState := s.data[key]; existsInPreState {
+		return false
+	}
+
+	s.data[key] = data
+
+	return true
+}
+
+// SetIfNotContainsFunc sets the value for the provided key using the provided function
+func (s *SyncMap[TKey, TData]) SetIfNotContainsFunc(key TKey, data func() TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if _, existsInPreState := s.data[key]; existsInPreState {
+		return false
+	}
+
+	s.data[key] = data()
+
+	return true
+}
+
+// Get retrieves the value for the provided key
+func (s *SyncMap[TKey, TData]) Get(key TKey) (TData, bool) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		return v, true
+	} else {
+		return *new(TData), false
+	}
+}
+
+// GetAndSetIfNotContains returns the existing value if the key exists.
+// Otherwise, it sets the provided value and returns it.
+func (s *SyncMap[TKey, TData]) GetAndSetIfNotContains(key TKey, data TData) TData {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		return v
+	} else {
+		s.data[key] = data
+		return data
+	}
+}
+
+// GetAndSetIfNotContainsFunc returns the existing value if the key exists.
+// Otherwise, it calls the provided function to generate the value, sets it, and returns it.
+func (s *SyncMap[TKey, TData]) GetAndSetIfNotContainsFunc(key TKey, data func() TData) TData {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		return v
+	} else {
+		dataObj := data()
+		s.data[key] = dataObj
+		return dataObj
+	}
+}
+
+// Delete removes the entry with the provided key and returns true if the key existed before.
+func (s *SyncMap[TKey, TData]) Delete(key TKey) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	_, ok := s.data[key]
+
+	delete(s.data, key)
+
+	return ok
+}
+
+// DeleteIf deletes all entries that match the provided function and returns the number of removed entries.
+func (s *SyncMap[TKey, TData]) DeleteIf(fn func(key TKey, data TData) bool) int {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	rm := 0
+	for k, v := range s.data {
+		if fn(k, v) {
+			delete(s.data, k)
+			rm++
+		}
+	}
+
+	return rm
+}
+
+// UpdateIfExists updates the value if the key exists, otherwise it does nothing.
+func (s *SyncMap[TKey, TData]) UpdateIfExists(key TKey, fn func(data TData) TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		s.data[key] = fn(v)
+		return true
+	} else {
+		return false
+	}
+}
+
+// UpdateOrInsert updates the value if the key exists, otherwise it inserts the provided `insertValue`.
+func (s *SyncMap[TKey, TData]) UpdateOrInsert(key TKey, fn func(data TData) TData, insertValue TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		s.data[key] = fn(v)
+		return true
+	} else {
+		s.data[key] = insertValue
+		return false
+	}
+}
+
+// Clear removes all entries from the map.
+func (s *SyncMap[TKey, TData]) Clear() {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.data = make(map[TKey]TData)
+}
+
+// Contains checks if the map contains the provided key.
+func (s *SyncMap[TKey, TData]) Contains(key TKey) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	_, ok := s.data[key]
+
+	return ok
+}
+
+// GetAllKeys returns a copy (!) of all keys in the map.
+func (s *SyncMap[TKey, TData]) GetAllKeys() []TKey {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	r := make([]TKey, 0, len(s.data))
+
+	for k := range s.data {
+		r = append(r, k)
+	}
+
+	return r
+}
+
+// GetAllValues returns a copy (!) of all values in the map.
+func (s *SyncMap[TKey, TData]) GetAllValues() []TData {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	r := make([]TData, 0, len(s.data))
+
+	for _, v := range s.data {
+		r = append(r, v)
+	}
+
+	return r
+}
+
+// Count returns the number of entries in the map.
+func (s *SyncMap[TKey, TData]) Count() int {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	return len(s.data)
+}

dataext/syncRingSet.go

@@ -0,0 +1,143 @@
+package dataext
+
+import "sync"
+
+type SyncRingSet[TData comparable] struct {
+	data map[TData]bool
+	lock sync.Mutex
+	ring *RingBuffer[TData]
+}
+
+func NewSyncRingSet[TData comparable](capacity int) *SyncRingSet[TData] {
+	return &SyncRingSet[TData]{
+		data: make(map[TData]bool, capacity+1),
+		lock: sync.Mutex{},
+		ring: NewRingBuffer[TData](capacity),
+	}
+}
+
+// Add adds `value` to the set
+// returns true  if the value was actually inserted (value did not exist beforehand)
+// returns false if the value already existed
+func (s *SyncRingSet[TData]) Add(value TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	_, existsInPreState := s.data[value]
+	if existsInPreState {
+		return false
+	}
+
+	prev := s.ring.PushPop(value)
+
+	s.data[value] = true
+	if prev != nil {
+		delete(s.data, *prev)
+	}
+
+	return true
+}
+
+func (s *SyncRingSet[TData]) AddAll(values []TData) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	for _, value := range values {
+		_, existsInPreState := s.data[value]
+		if existsInPreState {
+			continue
+		}
+
+		prev := s.ring.PushPop(value)
+
+		s.data[value] = true
+		if prev != nil {
+			delete(s.data, *prev)
+		}
+	}
+}
+
+func (s *SyncRingSet[TData]) Remove(value TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	_, existsInPreState := s.data[value]
+	if !existsInPreState {
+		return false
+	}
+
+	delete(s.data, value)
+	s.ring.Remove(func(v TData) bool { return value == v })
+
+	return true
+}
+
+func (s *SyncRingSet[TData]) RemoveAll(values []TData) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	for _, value := range values {
+		delete(s.data, value)
+		s.ring.Remove(func(v TData) bool { return value == v })
+	}
+}
+
+func (s *SyncRingSet[TData]) Contains(value TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	_, ok := s.data[value]
+
+	return ok
+}
+
+func (s *SyncRingSet[TData]) Get() []TData {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	r := make([]TData, 0, len(s.data))
+
+	for k := range s.data {
+		r = append(r, k)
+	}
+
+	return r
+}
+
+// AddIfNotContains
+// returns true  if the value was actually added (value did not exist beforehand)
+// returns false if the value already existed
+func (s *SyncRingSet[TData]) AddIfNotContains(key TData) bool {
+	return s.Add(key)
+}
+
+// RemoveIfContains
+// returns true  if the value was actually removed (value did exist beforehand)
+// returns false if the value did not exist in the set
+func (s *SyncRingSet[TData]) RemoveIfContains(key TData) bool {
+	return s.Remove(key)
+}

dataext/syncSet.go

@@ -7,6 +7,13 @@ type SyncSet[TData comparable] struct {
 	lock sync.Mutex
 }
 
+func NewSyncSet[TData comparable]() *SyncSet[TData] {
+	return &SyncSet[TData]{data: make(map[TData]bool), lock: sync.Mutex{}}
+}
+
+// Add adds `value` to the set
+// returns true  if the value was actually inserted (value did not exist beforehand)
+// returns false if the value already existed
 func (s *SyncSet[TData]) Add(value TData) bool {
 	s.lock.Lock()
 	defer s.lock.Unlock()
@@ -15,10 +22,13 @@ func (s *SyncSet[TData]) Add(value TData) bool {
 		s.data = make(map[TData]bool)
 	}
 
-	_, ok := s.data[value]
+	_, existsInPreState := s.data[value]
-	s.data[value] = true
+	if existsInPreState {
+		return false
+	}
 
-	return !ok
+	s.data[value] = true
+	return true
 }
 
 func (s *SyncSet[TData]) AddAll(values []TData) {
@@ -34,6 +44,36 @@ func (s *SyncSet[TData]) AddAll(values []TData) {
 	}
 }
 
+func (s *SyncSet[TData]) Remove(value TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	_, existsInPreState := s.data[value]
+	if !existsInPreState {
+		return false
+	}
+
+	delete(s.data, value)
+	return true
+}
+
+func (s *SyncSet[TData]) RemoveAll(values []TData) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TData]bool)
+	}
+
+	for _, value := range values {
+		delete(s.data, value)
+	}
+}
+
 func (s *SyncSet[TData]) Contains(value TData) bool {
 	s.lock.Lock()
 	defer s.lock.Unlock()
@@ -63,3 +103,17 @@ func (s *SyncSet[TData]) Get() []TData {
 
 	return r
 }
+
+// AddIfNotContains
+// returns true  if the value was actually added (value did not exist beforehand)
+// returns false if the value already existed
+func (s *SyncSet[TData]) AddIfNotContains(key TData) bool {
+	return s.Add(key)
+}
+
+// RemoveIfContains
+// returns true  if the value was actually removed (value did exist beforehand)
+// returns false if the value did not exist in the set
+func (s *SyncSet[TData]) RemoveIfContains(key TData) bool {
+	return s.Remove(key)
+}

dataext/tuple.go

@@ -0,0 +1,241 @@
+package dataext
+
+type ValueGroup interface {
+	TupleLength() int
+	TupleValues() []any
+}
+
+// ----------------------------------------------------------------------------
+
+type Single[T1 any] struct {
+	V1 T1
+}
+
+func (s Single[T1]) TupleLength() int {
+	return 1
+}
+
+func (s Single[T1]) TupleValues() []any {
+	return []any{s.V1}
+}
+
+func NewSingle[T1 any](v1 T1) Single[T1] {
+	return Single[T1]{V1: v1}
+}
+
+func NewTuple1[T1 any](v1 T1) Single[T1] {
+	return Single[T1]{V1: v1}
+}
+
+// ----------------------------------------------------------------------------
+
+type Tuple[T1 any, T2 any] struct {
+	V1 T1
+	V2 T2
+}
+
+func (t Tuple[T1, T2]) TupleLength() int {
+	return 2
+}
+
+func (t Tuple[T1, T2]) TupleValues() []any {
+	return []any{t.V1, t.V2}
+}
+
+func NewTuple[T1 any, T2 any](v1 T1, v2 T2) Tuple[T1, T2] {
+	return Tuple[T1, T2]{V1: v1, V2: v2}
+}
+
+func NewTuple2[T1 any, T2 any](v1 T1, v2 T2) Tuple[T1, T2] {
+	return Tuple[T1, T2]{V1: v1, V2: v2}
+}
+
+// ----------------------------------------------------------------------------
+
+type Triple[T1 any, T2 any, T3 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+}
+
+func (t Triple[T1, T2, T3]) TupleLength() int {
+	return 3
+}
+
+func (t Triple[T1, T2, T3]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3}
+}
+
+func NewTriple[T1 any, T2 any, T3 any](v1 T1, v2 T2, v3 T3) Triple[T1, T2, T3] {
+	return Triple[T1, T2, T3]{V1: v1, V2: v2, V3: v3}
+}
+
+func NewTuple3[T1 any, T2 any, T3 any](v1 T1, v2 T2, v3 T3) Triple[T1, T2, T3] {
+	return Triple[T1, T2, T3]{V1: v1, V2: v2, V3: v3}
+}
+
+// ----------------------------------------------------------------------------
+
+type Quadruple[T1 any, T2 any, T3 any, T4 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+}
+
+func (t Quadruple[T1, T2, T3, T4]) TupleLength() int {
+	return 4
+}
+
+func (t Quadruple[T1, T2, T3, T4]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4}
+}
+
+func NewQuadruple[T1 any, T2 any, T3 any, T4 any](v1 T1, v2 T2, v3 T3, v4 T4) Quadruple[T1, T2, T3, T4] {
+	return Quadruple[T1, T2, T3, T4]{V1: v1, V2: v2, V3: v3, V4: v4}
+}
+
+func NewTuple4[T1 any, T2 any, T3 any, T4 any](v1 T1, v2 T2, v3 T3, v4 T4) Quadruple[T1, T2, T3, T4] {
+	return Quadruple[T1, T2, T3, T4]{V1: v1, V2: v2, V3: v3, V4: v4}
+}
+
+// ----------------------------------------------------------------------------
+
+type Quintuple[T1 any, T2 any, T3 any, T4 any, T5 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+	V5 T5
+}
+
+func (t Quintuple[T1, T2, T3, T4, T5]) TupleLength() int {
+	return 5
+}
+
+func (t Quintuple[T1, T2, T3, T4, T5]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4, t.V5}
+
+}
+
+func NewQuintuple[T1 any, T2 any, T3 any, T4 any, T5 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5) Quintuple[T1, T2, T3, T4, T5] {
+	return Quintuple[T1, T2, T3, T4, T5]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5}
+}
+
+func NewTuple5[T1 any, T2 any, T3 any, T4 any, T5 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5) Quintuple[T1, T2, T3, T4, T5] {
+	return Quintuple[T1, T2, T3, T4, T5]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5}
+}
+
+// ----------------------------------------------------------------------------
+
+type Sextuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+	V5 T5
+	V6 T6
+}
+
+func (t Sextuple[T1, T2, T3, T4, T5, T6]) TupleLength() int {
+	return 6
+}
+
+func (t Sextuple[T1, T2, T3, T4, T5, T6]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4, t.V5, t.V6}
+
+}
+
+func NewSextuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6) Sextuple[T1, T2, T3, T4, T5, T6] {
+	return Sextuple[T1, T2, T3, T4, T5, T6]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6}
+}
+
+func NewTuple6[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6) Sextuple[T1, T2, T3, T4, T5, T6] {
+	return Sextuple[T1, T2, T3, T4, T5, T6]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6}
+}
+
+// ----------------------------------------------------------------------------
+
+type Septuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+	V5 T5
+	V6 T6
+	V7 T7
+}
+
+func (t Septuple[T1, T2, T3, T4, T5, T6, T7]) TupleLength() int {
+	return 7
+}
+
+func (t Septuple[T1, T2, T3, T4, T5, T6, T7]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4, t.V5, t.V6, t.V7}
+}
+
+func NewSeptuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7) Septuple[T1, T2, T3, T4, T5, T6, T7] {
+	return Septuple[T1, T2, T3, T4, T5, T6, T7]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7}
+}
+
+func NewTuple7[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7) Septuple[T1, T2, T3, T4, T5, T6, T7] {
+	return Septuple[T1, T2, T3, T4, T5, T6, T7]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7}
+}
+
+// ----------------------------------------------------------------------------
+
+type Octuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+	V5 T5
+	V6 T6
+	V7 T7
+	V8 T8
+}
+
+func (t Octuple[T1, T2, T3, T4, T5, T6, T7, T8]) TupleLength() int {
+	return 8
+}
+
+func (t Octuple[T1, T2, T3, T4, T5, T6, T7, T8]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4, t.V5, t.V6, t.V7, t.V8}
+}
+
+func NewOctuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7, v8 T8) Octuple[T1, T2, T3, T4, T5, T6, T7, T8] {
+	return Octuple[T1, T2, T3, T4, T5, T6, T7, T8]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7, V8: v8}
+}
+
+func NewTuple8[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7, v8 T8) Octuple[T1, T2, T3, T4, T5, T6, T7, T8] {
+	return Octuple[T1, T2, T3, T4, T5, T6, T7, T8]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7, V8: v8}
+}
+
+// ----------------------------------------------------------------------------
+
+type Nonuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any, T9 any] struct {
+	V1 T1
+	V2 T2
+	V3 T3
+	V4 T4
+	V5 T5
+	V6 T6
+	V7 T7
+	V8 T8
+	V9 T9
+}
+
+func (t Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9]) TupleLength() int {
+	return 9
+}
+
+func (t Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9]) TupleValues() []any {
+	return []any{t.V1, t.V2, t.V3, t.V4, t.V5, t.V6, t.V7, t.V8, t.V9}
+}
+
+func NewNonuple[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any, T9 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7, v8 T8, v9 T9) Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9] {
+	return Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7, V8: v8, V9: v9}
+}
+func NewTuple9[T1 any, T2 any, T3 any, T4 any, T5 any, T6 any, T7 any, T8 any, T9 any](v1 T1, v2 T2, v3 T3, v4 T4, v5 T5, v6 T6, v7 T7, v8 T8, v9 T9) Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9] {
+	return Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9]{V1: v1, V2: v2, V3: v3, V4: v4, V5: v5, V6: v6, V7: v7, V8: v8, V9: v9}
+}

enums/enum.go

@@ -0,0 +1,57 @@
+package enums
+
+import "encoding/json"
+
+type Enum interface {
+	Valid() bool
+	ValuesAny() []any
+	ValuesMeta() []EnumMetaValue
+	VarName() string
+	TypeName() string
+	PackageName() string
+}
+
+type StringEnum interface {
+	Enum
+	String() string
+}
+
+type DescriptionEnum interface {
+	Enum
+	Description() string
+	DescriptionMeta() EnumDescriptionMetaValue
+}
+
+type EnumMetaValue struct {
+	VarName     string  `json:"varName"`
+	Value       Enum    `json:"value"`
+	Description *string `json:"description"`
+}
+
+type EnumDescriptionMetaValue struct {
+	VarName     string `json:"varName"`
+	Value       Enum   `json:"value"`
+	Description string `json:"description"`
+}
+
+type EnumDataMetaValue struct {
+	VarName     string  `json:"varName"`
+	Value       Enum    `json:"value"`
+	Description *string `json:"description"`
+
+	Data map[string]any `json:"-"` //handled by MarshalJSON
+}
+
+func (v EnumDataMetaValue) MarshalJSON() ([]byte, error) {
+	m := make(map[string]any, 8)
+
+	for k, dv := range v.Data {
+		m[k] = dv
+	}
+
+	m["varName"] = v.VarName
+	m["value"] = v.Value
+	m["description"] = v.Description
+
+	return json.Marshal(m)
+}

excelext/mapper.go

@@ -0,0 +1,300 @@
+package excelext
+
+import (
+	"reflect"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/dataext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	excelize360 "github.com/360EntSecGroup-Skylar/excelize"
+	"github.com/xuri/excelize/v2"
+)
+
+type excelMapperColDefinition[T any] struct {
+	style  *int
+	header string
+	width  *float64
+	fn     func(T) (any, error)
+}
+
+type ExcelMapper[T any] struct {
+	StyleDate       *int
+	StyleDatetime   *int
+	StyleEUR        *int
+	StylePercentage *int
+	StyleHeader     *int
+	StyleWSHeader   *int
+
+	SkipColumnHeader bool
+
+	sheetName      string
+	wsHeader       []dataext.Tuple[string, *int]
+	colDefinitions []excelMapperColDefinition[T]
+	colFilter      []func(v T) bool
+}
+
+func NewExcelMapper[T any]() (*ExcelMapper[T], error) {
+
+	em := &ExcelMapper[T]{
+		StyleDate:       nil,
+		StyleDatetime:   nil,
+		StyleEUR:        nil,
+		StylePercentage: nil,
+		StyleHeader:     nil,
+		StyleWSHeader:   nil,
+		sheetName:       "",
+
+		SkipColumnHeader: false,
+
+		wsHeader:       make([]dataext.Tuple[string, *int], 0),
+		colDefinitions: make([]excelMapperColDefinition[T], 0),
+	}
+
+	return em, nil
+}
+
+func (em *ExcelMapper[T]) InitNewFile(sheetName string) (*excelize.File, error) {
+	f := excelize.NewFile()
+
+	defSheet := f.GetSheetList()[0]
+
+	sheet1 := sheetName
+
+	sheetIdx, err := f.NewSheet(sheet1)
+	if err != nil {
+		return nil, err
+	}
+
+	f.SetActiveSheet(sheetIdx)
+	err = f.DeleteSheet(defSheet)
+
+	err = em.InitStyles(f)
+	if err != nil {
+		return nil, err
+	}
+
+	return f, nil
+}
+
+func (em *ExcelMapper[T]) InitStyles(f *excelize.File) error {
+	styleDate, err := f.NewStyle(&excelize.Style{
+		CustomNumFmt: langext.Ptr("dd.mm.yyyy"),
+	})
+	if err != nil {
+		return err
+	}
+
+	styleDatetime, err := f.NewStyle(&excelize.Style{
+		NumFmt: 22,
+	})
+	if err != nil {
+		return err
+	}
+
+	styleEUR, err := f.NewStyle(&excelize.Style{
+		NumFmt: 218,
+	})
+	if err != nil {
+		return err
+	}
+
+	stylePercentage, err := f.NewStyle(&excelize.Style{
+		NumFmt: 10,
+	})
+	if err != nil {
+		return err
+	}
+
+	styleHeader, err := f.NewStyle(&excelize.Style{
+		Font: &excelize.Font{Bold: true, Size: 11},
+	})
+	if err != nil {
+		return err
+	}
+
+	styleWSHeader, err := f.NewStyle(&excelize.Style{
+		Font: &excelize.Font{Bold: true, Size: 24},
+	})
+	if err != nil {
+		return err
+	}
+
+	em.StyleDate = &styleDate
+	em.StyleDatetime = &styleDatetime
+	em.StyleEUR = &styleEUR
+	em.StylePercentage = &stylePercentage
+	em.StyleHeader = &styleHeader
+	em.StyleWSHeader = &styleWSHeader
+
+	return nil
+}
+
+func (em *ExcelMapper[T]) AddWorksheetHeader(header string, style *int) {
+	em.wsHeader = append(em.wsHeader, dataext.NewTuple(header, style))
+}
+
+func (em *ExcelMapper[T]) AddColumn(header string, style *int, width *float64, fn func(T) any) {
+	em.colDefinitions = append(em.colDefinitions, excelMapperColDefinition[T]{
+		style:  style,
+		header: header,
+		width:  width,
+		fn:     func(t T) (any, error) { return fn(t), nil },
+	})
+}
+
+func (em *ExcelMapper[T]) AddColumnErr(header string, style *int, width *float64, fn func(T) (any, error)) {
+	em.colDefinitions = append(em.colDefinitions, excelMapperColDefinition[T]{
+		style:  style,
+		header: header,
+		width:  width,
+		fn:     fn,
+	})
+}
+
+func (em *ExcelMapper[T]) Build(sheetName string, data []T) ([]byte, error) {
+	f, err := em.InitNewFile(sheetName)
+	if err != nil {
+		return nil, exerr.Wrap(err, "failed to init new file").Build()
+	}
+
+	err = em.BuildSingleSheet(f, sheetName, data)
+	if err != nil {
+		return nil, exerr.Wrap(err, "").Build()
+	}
+
+	buffer, err := f.WriteToBuffer()
+	if err != nil {
+		return nil, exerr.Wrap(err, "failed to build xls").Build()
+	}
+
+	return buffer.Bytes(), nil
+}
+
+func (em *ExcelMapper[T]) BuildSingleSheet(f *excelize.File, sheetName string, data []T) error {
+	if em.StyleHeader == nil || em.StyleDate == nil || em.StyleDatetime == nil || em.StyleEUR == nil || em.StylePercentage == nil || em.StyleWSHeader == nil {
+		err := em.InitStyles(f)
+		if err != nil {
+			return exerr.Wrap(err, "failed to init styles").Build()
+		}
+	}
+
+	rowOffset := 0
+
+	if len(em.wsHeader) > 0 {
+		for range em.wsHeader {
+			rowOffset += 1
+		}
+		rowOffset += 1
+	}
+
+	if !em.SkipColumnHeader {
+		for i, col := range em.colDefinitions {
+			err := f.SetCellValue(sheetName, c(rowOffset+1, i), col.header)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	for i, col := range em.colDefinitions {
+		if col.style != nil {
+			err := f.SetColStyle(sheetName, excelize360.ToAlphaString(i), *col.style)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	for i, col := range em.colDefinitions {
+		if col.width != nil {
+			err := f.SetColWidth(sheetName, excelize360.ToAlphaString(i), excelize360.ToAlphaString(i), *col.width)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	err := f.SetRowStyle(sheetName, rowOffset+1, rowOffset+1, *em.StyleHeader)
+	if err != nil {
+		return err
+	}
+
+	if len(em.wsHeader) > 0 {
+		for i, hdr := range em.wsHeader {
+			style := *langext.CoalesceOpt(hdr.V2, em.StyleWSHeader)
+
+			err = f.SetCellValue(sheetName, c(i+1, 0), hdr.V1)
+			if err != nil {
+				return err
+			}
+
+			err = f.MergeCell(sheetName, c(i+1, 0), c(i+1, len(em.colDefinitions)-1))
+			if err != nil {
+				return err
+			}
+
+			err = f.SetRowStyle(sheetName, 1, 1, style)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	iRow := rowOffset + 1
+	if !em.SkipColumnHeader {
+		iRow += 1
+	}
+
+	for _, dat := range data {
+
+		skip := false
+		for _, filter := range em.colFilter {
+			if !filter(dat) {
+				skip = true
+				break
+			}
+		}
+		if skip {
+			continue
+		}
+
+		for iCol, col := range em.colDefinitions {
+
+			cellVal, err := col.fn(dat)
+			if err != nil {
+				return err
+			}
+
+			for reflect.ValueOf(cellVal).Kind() == reflect.Pointer && !reflect.ValueOf(cellVal).IsNil() {
+				cellVal = reflect.ValueOf(cellVal).Elem().Interface()
+			}
+
+			if langext.IsNil(cellVal) {
+				err = f.SetCellValue(sheetName, c(iRow, iCol), "")
+				if err != nil {
+					return err
+				}
+			} else {
+				err = f.SetCellValue(sheetName, c(iRow, iCol), cellVal)
+				if err != nil {
+					return err
+				}
+			}
+
+		}
+
+		iRow++
+	}
+
+	//for i, col := range em.colDefinitions {
+	//	if col.width == nil {
+	//		//TODO https://github.com/qax-os/excelize/pull/1386
+	//	}
+	//}
+
+	return nil
+}
+
+func (em *ExcelMapper[T]) AddFilter(f func(v T) bool) {
+	em.colFilter = append(em.colFilter, f)
+}

excelext/utils.go

@@ -0,0 +1,26 @@
+package excelext
+
+import (
+	"strconv"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/rfctime"
+	"github.com/360EntSecGroup-Skylar/excelize"
+)
+
+func c(row int, col int) string {
+	return excelize.ToAlphaString(col) + strconv.Itoa(row)
+}
+
+func excelizeOptTime(t *rfctime.RFC3339NanoTime) any {
+	if t == nil {
+		return ""
+	}
+	return t.Time()
+}
+
+func excelizeOptDate(t *rfctime.Date) any {
+	if t == nil {
+		return ""
+	}
+	return t.TimeUTC()
+}

exerr/builder.go

@@ -0,0 +1,572 @@
+package exerr
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"runtime/debug"
+	"strings"
+	"time"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/dataext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/enums"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+//
+// ==== USAGE =====
+//
+// If some method returns an error _always wrap it into an exerror:
+//     value, err := do_something(..)
+//     if err != nil {
+//         return nil, exerror.Wrap(err, "do something failed").Build()
+//     }
+//
+// If possible add metadata to the error (eg the id that was not found, ...), the methods are the same as in zerolog
+//     return nil, exerror.Wrap(err, "do something failed").Str("someid", id).Int("count", in.Count).Build()
+//
+// You can also add extra-data to an error with Extra(..)
+// in contrast to metadata is extradata always printed in the resulting error and is more intended for additional (programmatically readable) data in addition to the errortype
+// (metadata is more internal debug info/help)
+//
+// You can change the errortype with `.User()` and `.System()` (User-errors are 400 and System-errors 500)
+// You can also manually set the statuscode with `.WithStatuscode(http.NotFound)`
+// You can set the type with `WithType(..)`
+//
+// New Errors (that don't wrap an existing err object) are created with New
+//     return nil, exerror.New(exerror.TypeInternal, "womethign wen horrible wrong").Build()
+// You can eitehr use an existing ErrorType, the "catch-all" ErrInternal, or add you own ErrType in consts.go
+//
+// All errors should be handled one of the following four ways:
+//   - return the error to the caller and let him handle it:
+//     (also auto-prints the error to the log)
+//     => Wrap/New + Build
+//   - Print the error
+//     (also auto-sends it to the error-service)
+//     This is useful for errors that happen asynchron or are non-fatal for the current request
+//     => Wrap/New + Print
+//   - Return the error to the Rest-API caller
+//     (also auto-prints the error to the log)
+//     (also auto-sends it to the error-service)
+//     => Wrap/New + Output
+//   - Print and stop the service
+//     (also auto-sends it to the error-service)
+//     => Wrap/New + Fatal
+//
+
+type Builder struct {
+	wrappedErr          error
+	errorData           *ExErr
+	containsGinData     bool
+	containsContextData bool
+	noLog               bool
+}
+
+func Get(err error) *Builder {
+	return &Builder{errorData: FromError(err)}
+}
+
+func New(t ErrorType, msg string) *Builder {
+	return &Builder{errorData: newExErr(CatSystem, t, msg)}
+}
+
+func Wrap(err error, msg string) *Builder {
+	if err == nil {
+		return &Builder{errorData: newExErr(CatSystem, TypeInternal, msg)} // prevent NPE if we call Wrap with err==nil
+	}
+
+	v := FromError(err)
+
+	if !pkgconfig.RecursiveErrors {
+		v.Message = msg
+		return &Builder{wrappedErr: err, errorData: v}
+	} else {
+		return &Builder{wrappedErr: err, errorData: wrapExErr(v, msg, CatWrap, 1)}
+	}
+}
+
+// ----------------------------------------------------------------------------
+
+func (b *Builder) WithType(t ErrorType) *Builder {
+	b.errorData.Type = t
+	return b
+}
+
+func (b *Builder) WithStatuscode(status int) *Builder {
+	b.errorData.StatusCode = &status
+	return b
+}
+
+func (b *Builder) WithMessage(msg string) *Builder {
+	b.errorData.Message = msg
+	return b
+}
+
+func (b *Builder) WithSeverity(v ErrorSeverity) *Builder {
+	b.errorData.Severity = v
+	return b
+}
+
+func (b *Builder) WithCategory(v ErrorCategory) *Builder {
+	b.errorData.Category = v
+	return b
+}
+
+// ----------------------------------------------------------------------------
+
+// Err changes the Severity to ERROR (default)
+// The error will be:
+//
+//   - On Build():
+//
+//   - Short-Logged as Err
+//
+//   - On Print():
+//
+//   - Logged as Err
+//
+//   - Send to the error-service
+//
+//   - On Output():
+//
+//   - Logged as Err
+//
+//   - Send to the error-service
+func (b *Builder) Err() *Builder {
+	b.errorData.Severity = SevErr
+	return b
+}
+
+// Warn changes the Severity to WARN
+// The error will be:
+//
+//   - On Build():
+//
+//   - -(nothing)-
+//
+//   - On Print():
+//
+//   - Short-Logged as Warn
+//
+//   - On Output():
+//
+//   - Logged as Warn
+func (b *Builder) Warn() *Builder {
+	b.errorData.Severity = SevWarn
+	return b
+}
+
+// Info changes the Severity to INFO
+// The error will be:
+//
+//   - On Build():
+//
+//   - -(nothing)-
+//
+//   - On Print():
+//
+//   - -(nothing)-
+//
+//   - On Output():
+//
+//   - -(nothing)-
+func (b *Builder) Info() *Builder {
+	b.errorData.Severity = SevInfo
+	return b
+}
+
+// ----------------------------------------------------------------------------
+
+// User sets the Category to CatUser
+//
+// Errors with category
+func (b *Builder) User() *Builder {
+	b.errorData.Category = CatUser
+	return b
+}
+
+func (b *Builder) System() *Builder {
+	b.errorData.Category = CatSystem
+	return b
+}
+
+// ----------------------------------------------------------------------------
+
+func (b *Builder) NoLog() *Builder {
+	b.noLog = true
+	return b
+}
+
+// ----------------------------------------------------------------------------
+
+func (b *Builder) Id(key string, val fmt.Stringer) *Builder {
+	return b.addMeta(key, MDTID, newIDWrap(val))
+}
+
+func (b *Builder) StrPtr(key string, val *string) *Builder {
+	return b.addMeta(key, MDTStringPtr, val)
+}
+
+func (b *Builder) Str(key string, val string) *Builder {
+	return b.addMeta(key, MDTString, val)
+}
+
+func (b *Builder) Int(key string, val int) *Builder {
+	return b.addMeta(key, MDTInt, val)
+}
+
+func (b *Builder) Int8(key string, val int8) *Builder {
+	return b.addMeta(key, MDTInt8, val)
+}
+
+func (b *Builder) Int16(key string, val int16) *Builder {
+	return b.addMeta(key, MDTInt16, val)
+}
+
+func (b *Builder) Int32(key string, val int32) *Builder {
+	return b.addMeta(key, MDTInt32, val)
+}
+
+func (b *Builder) Int64(key string, val int64) *Builder {
+	return b.addMeta(key, MDTInt64, val)
+}
+
+func (b *Builder) Float32(key string, val float32) *Builder {
+	return b.addMeta(key, MDTFloat32, val)
+}
+
+func (b *Builder) Float64(key string, val float64) *Builder {
+	return b.addMeta(key, MDTFloat64, val)
+}
+
+func (b *Builder) Bool(key string, val bool) *Builder {
+	return b.addMeta(key, MDTBool, val)
+}
+
+func (b *Builder) Bytes(key string, val []byte) *Builder {
+	return b.addMeta(key, MDTBytes, val)
+}
+
+func (b *Builder) ObjectID(key string, val primitive.ObjectID) *Builder {
+	return b.addMeta(key, MDTObjectID, val)
+}
+
+func (b *Builder) Time(key string, val time.Time) *Builder {
+	return b.addMeta(key, MDTTime, val)
+}
+
+func (b *Builder) Dur(key string, val time.Duration) *Builder {
+	return b.addMeta(key, MDTDuration, val)
+}
+
+func (b *Builder) Strs(key string, val []string) *Builder {
+	return b.addMeta(key, MDTStringArray, val)
+}
+
+func (b *Builder) Ints(key string, val []int) *Builder {
+	return b.addMeta(key, MDTIntArray, val)
+}
+
+func (b *Builder) Ints32(key string, val []int32) *Builder {
+	return b.addMeta(key, MDTInt32Array, val)
+}
+
+func (b *Builder) Type(key string, cls interface{}) *Builder {
+	return b.addMeta(key, MDTString, fmt.Sprintf("%T", cls))
+}
+
+func (b *Builder) Interface(key string, val interface{}) *Builder {
+	return b.addMeta(key, MDTAny, newAnyWrap(val))
+}
+
+func (b *Builder) Any(key string, val any) *Builder {
+	return b.addMeta(key, MDTAny, newAnyWrap(val))
+}
+
+func (b *Builder) Stringer(key string, val fmt.Stringer) *Builder {
+	if langext.IsNil(val) {
+		return b.addMeta(key, MDTString, "(!nil)")
+	} else {
+		return b.addMeta(key, MDTString, val.String())
+	}
+}
+
+func (b *Builder) Enum(key string, val enums.Enum) *Builder {
+	return b.addMeta(key, MDTEnum, newEnumWrap(val))
+}
+
+func (b *Builder) Stack() *Builder {
+	return b.addMeta("@Stack", MDTString, string(debug.Stack()))
+}
+
+func (b *Builder) Errs(key string, val []error) *Builder {
+	for i, valerr := range val {
+		b.addMeta(fmt.Sprintf("%v[%v]", key, i), MDTString, Get(valerr).errorData.FormatLog(LogPrintFull))
+	}
+	return b
+}
+
+func (b *Builder) GinReq(ctx context.Context, g *gin.Context, req *http.Request) *Builder {
+	if v := ctx.Value("start_timestamp"); v != nil {
+		if t, ok := v.(time.Time); ok {
+			b.Time("ctx_startTimestamp", t)
+			b.Time("ctx_endTimestamp", time.Now())
+		}
+	}
+	b.Str("gin_method", req.Method)
+	b.Str("gin_host", req.Host)
+	b.Str("gin_path", g.FullPath())
+	b.Strs("gin_header", extractHeader(g.Request.Header))
+	if req.URL != nil {
+		b.Str("gin_url", req.URL.String())
+	}
+	if ctxVal := g.GetString("apiversion"); ctxVal != "" {
+		b.Str("gin_context_apiversion", ctxVal)
+	}
+	if ctxVal := g.GetString("uid"); ctxVal != "" {
+		b.Str("gin_context_uid", ctxVal)
+	}
+	if ctxVal := g.GetString("fcmId"); ctxVal != "" {
+		b.Str("gin_context_fcmid", ctxVal)
+	}
+	if ctxVal := g.GetString("reqid"); ctxVal != "" {
+		b.Str("gin_context_reqid", ctxVal)
+	}
+	if req.Method != "GET" && req.Body != nil {
+
+		if req.Header.Get("Content-Type") == "application/json" {
+			if brc, ok := req.Body.(dataext.BufferedReadCloser); ok {
+				if bin, err := brc.BufferedAll(); err == nil {
+					if len(bin) < 16*1024 {
+						var prettyJSON bytes.Buffer
+						err = json.Indent(&prettyJSON, bin, "", "  ")
+						if err == nil {
+							b.Str("gin_body", string(prettyJSON.Bytes()))
+						} else {
+							b.Bytes("gin_body", bin)
+						}
+					} else {
+						b.Str("gin_body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
+					}
+				}
+			}
+		}
+
+		if req.Header.Get("Content-Type") == "multipart/form-data" || req.Header.Get("Content-Type") == "x-www-form-urlencoded" {
+			if brc, ok := req.Body.(dataext.BufferedReadCloser); ok {
+				if bin, err := brc.BufferedAll(); err == nil {
+					if len(bin) < 16*1024 {
+						b.Bytes("gin_body", bin)
+					} else {
+						b.Str("gin_body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
+					}
+				}
+			}
+		}
+
+	}
+
+	pkgconfig.ExtendGinMeta(ctx, b, g, req)
+
+	b.containsGinData = true
+	return b
+}
+
+func (b *Builder) CtxData(method Method, ctx context.Context) *Builder {
+	pkgconfig.ExtendContextMeta(b, method, ctx)
+
+	b.containsContextData = true
+
+	return b
+}
+
+func extractHeader(header map[string][]string) []string {
+	r := make([]string, 0, len(header))
+	for k, v := range header {
+		for _, hval := range v {
+			value := hval
+			value = strings.ReplaceAll(value, "\n", "\\n")
+			value = strings.ReplaceAll(value, "\r", "\\r")
+			value = strings.ReplaceAll(value, "\t", "\\t")
+			r = append(r, k+": "+value)
+		}
+	}
+	return r
+}
+
+// ----------------------------------------------------------------------------
+
+// Extra adds additional data to the error
+// this is not like the other metadata (like Id(), Str(), etc)
+// this data is public and will be printed/outputted
+func (b *Builder) Extra(key string, val any) *Builder {
+	b.errorData.Extra[key] = val
+	return b
+}
+
+// ----------------------------------------------------------------------------
+
+// Build creates a new error, ready to pass up the stack
+// If the errors is not SevWarn or SevInfo it gets also logged (in short form, without stacktrace) onto stdout
+// Can be gloablly configured with ZeroLogErrTraces and ZeroLogAllTraces
+// Can be locally suppressed with Builder.NoLog()
+func (b *Builder) Build(ctxs ...context.Context) error {
+	return b.BuildAsExerr(ctxs...)
+}
+
+func (b *Builder) BuildAsExerr(ctxs ...context.Context) *ExErr {
+	warnOnPkgConfigNotInitialized()
+
+	for _, dctx := range ctxs {
+		b.CtxData(MethodBuild, dctx)
+	}
+
+	if pkgconfig.DisableErrorWrapping && b.wrappedErr != nil {
+		return FromError(b.wrappedErr)
+	}
+
+	if pkgconfig.ZeroLogErrTraces && !b.noLog {
+		if b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Error())
+		} else if b.errorData.Severity == SevWarn {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Warn())
+		} else if b.errorData.Severity == SevInfo {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Info())
+		} else if b.errorData.Severity == SevDebug {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Debug())
+		} else if b.errorData.Severity == SevTrace {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Trace())
+		} else {
+			b.errorData.ShortLog(pkgconfig.ZeroLogger.Error()) // ?!? unknown severity
+		}
+
+	}
+	b.errorData.CallListener(MethodBuild, ListenerOpt{NoLog: b.noLog})
+
+	return b.errorData
+}
+
+// Output prints the error onto the gin stdout.
+// The error also gets printed to stdout/stderr
+// If the error is SevErr|SevFatal we also send it to the error-service
+func (b *Builder) Output(ctx context.Context, g *gin.Context) {
+	warnOnPkgConfigNotInitialized()
+
+	if !b.containsGinData && g.Request != nil {
+		// Auto-Add gin metadata if the caller hasn't already done it
+		b.GinReq(ctx, g, g.Request)
+	}
+
+	b.CtxData(MethodOutput, ctx)
+
+	// this is only here to add one level to the trace
+	// so that .Build() and .Output() and .Print() have the same depth and our stack-skip logger can have the same skip-count
+	b.doGinOutput(ctx, g)
+}
+
+// OutputRaw works teh same as Output() - but does not depend on gin and works with a raw http.ResponseWriter
+func (b *Builder) OutputRaw(w http.ResponseWriter) {
+	warnOnPkgConfigNotInitialized()
+
+	// this is only here to add one level to the trace
+	// so that .Build() and .Output() and .Print() have the same depth and our stack-skip logger can have the same skip-count
+	b.doRawOutput(w)
+}
+
+func (b *Builder) doGinOutput(ctx context.Context, g *gin.Context) {
+	b.errorData.Output(g)
+
+	if (b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal) && (pkgconfig.ZeroLogErrGinOutput || pkgconfig.ZeroLogAllGinOutput) {
+		b.errorData.Log(pkgconfig.ZeroLogger.Error())
+	} else if (b.errorData.Severity == SevWarn) && (pkgconfig.ZeroLogAllGinOutput) {
+		b.errorData.Log(pkgconfig.ZeroLogger.Warn())
+	}
+
+	b.errorData.CallListener(MethodOutput, ListenerOpt{NoLog: b.noLog})
+}
+
+func (b *Builder) doRawOutput(w http.ResponseWriter) {
+	b.errorData.OutputRaw(w)
+
+	if (b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal) && (pkgconfig.ZeroLogErrGinOutput || pkgconfig.ZeroLogAllGinOutput) {
+		b.errorData.Log(pkgconfig.ZeroLogger.Error())
+	} else if (b.errorData.Severity == SevWarn) && (pkgconfig.ZeroLogAllGinOutput) {
+		b.errorData.Log(pkgconfig.ZeroLogger.Warn())
+	}
+
+	b.errorData.CallListener(MethodOutput, ListenerOpt{NoLog: b.noLog})
+}
+
+// Print prints the error
+// If the error is SevErr we also send it to the error-service
+func (b *Builder) Print(ctxs ...context.Context) Proxy {
+	warnOnPkgConfigNotInitialized()
+
+	for _, dctx := range ctxs {
+		b.CtxData(MethodPrint, dctx)
+	}
+
+	// this is only here to add one level to the trace
+	// so that .Build() and .Output() and .Print() have the same depth and our stack-skip logger can have the same skip-count
+	return b.doPrint()
+}
+
+func (b *Builder) doPrint() Proxy {
+	if b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal {
+		b.errorData.Log(pkgconfig.ZeroLogger.Error())
+	} else if b.errorData.Severity == SevWarn {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Warn())
+	} else if b.errorData.Severity == SevInfo {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Info())
+	} else if b.errorData.Severity == SevDebug {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Debug())
+	} else if b.errorData.Severity == SevTrace {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Trace())
+	} else {
+		b.errorData.Log(pkgconfig.ZeroLogger.Error()) // ?!? unknown severity
+	}
+
+	b.errorData.CallListener(MethodPrint, ListenerOpt{NoLog: b.noLog})
+
+	return Proxy{v: *b.errorData} // we return Proxy<Exerr> here instead of Exerr to prevent warnings on ignored err-returns
+}
+
+func (b *Builder) Format(level LogPrintLevel) string {
+	return b.errorData.FormatLog(level)
+}
+
+// Fatal prints the error and terminates the program
+// If the error is SevErr we also send it to the error-service
+func (b *Builder) Fatal(ctxs ...context.Context) {
+
+	b.errorData.Severity = SevFatal
+
+	for _, dctx := range ctxs {
+		b.CtxData(MethodFatal, dctx)
+	}
+
+	// this is only here to add one level to the trace
+	// so that .Build() and .Output() and .Print() have the same depth and our stack-skip logger can have the same skip-count
+	b.doLogFatal()
+
+	b.errorData.CallListener(MethodFatal, ListenerOpt{NoLog: b.noLog})
+
+	os.Exit(1)
+}
+
+func (b *Builder) doLogFatal() {
+	b.errorData.Log(pkgconfig.ZeroLogger.WithLevel(zerolog.FatalLevel))
+}
+
+// ----------------------------------------------------------------------------
+
+func (b *Builder) addMeta(key string, mdtype metaDataType, val interface{}) *Builder {
+	b.errorData.Meta.add(key, mdtype, val)
+	return b
+}

exerr/constructor.go

@@ -0,0 +1,274 @@
+package exerr
+
+import (
+	"encoding/json"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"reflect"
+	"time"
+)
+
+var reflectTypeStr = reflect.TypeOf("")
+
+func FromError(err error) *ExErr {
+
+	if err == nil {
+		// prevent NPE if we call FromError with err==nil
+		return &ExErr{
+			UniqueID:       newID(),
+			Category:       CatForeign,
+			Type:           TypeInternal,
+			Severity:       SevErr,
+			Timestamp:      time.Time{},
+			StatusCode:     nil,
+			Message:        "",
+			WrappedErrType: "nil",
+			WrappedErr:     err,
+			Caller:         "",
+			OriginalError:  nil,
+			Meta:           make(MetaMap),
+			Extra:          make(map[string]any),
+		}
+	}
+
+	//goland:noinspection GoTypeAssertionOnErrors
+	if verr, ok := err.(*ExErr); ok {
+		// A simple ExErr
+		return verr
+	}
+
+	//goland:noinspection GoTypeAssertionOnErrors
+	if verr, ok := err.(langext.PanicWrappedErr); ok {
+		return &ExErr{
+			UniqueID:       newID(),
+			Category:       CatForeign,
+			Type:           TypePanic,
+			Severity:       SevErr,
+			Timestamp:      time.Time{},
+			StatusCode:     nil,
+			Message:        "A panic occured",
+			WrappedErrType: fmt.Sprintf("%T", verr),
+			WrappedErr:     err,
+			Caller:         "",
+			OriginalError:  nil,
+			Meta: MetaMap{
+				"panic_object": {DataType: MDTString, Value: fmt.Sprintf("%+v", verr.RecoveredObj())},
+				"panic_type":   {DataType: MDTString, Value: fmt.Sprintf("%T", verr.RecoveredObj())},
+				"stack":        {DataType: MDTString, Value: verr.Stack},
+			},
+			Extra: make(map[string]any),
+		}
+	}
+
+	//goland:noinspection GoTypeAssertionOnErrors
+	if verr, ok := err.(*langext.PanicWrappedErr); ok && verr != nil {
+		return &ExErr{
+			UniqueID:       newID(),
+			Category:       CatForeign,
+			Type:           TypePanic,
+			Severity:       SevErr,
+			Timestamp:      time.Time{},
+			StatusCode:     nil,
+			Message:        "A panic occured",
+			WrappedErrType: fmt.Sprintf("%T", verr),
+			WrappedErr:     err,
+			Caller:         "",
+			OriginalError:  nil,
+			Meta: MetaMap{
+				"panic_object": {DataType: MDTString, Value: fmt.Sprintf("%+v", verr.RecoveredObj())},
+				"panic_type":   {DataType: MDTString, Value: fmt.Sprintf("%T", verr.RecoveredObj())},
+				"stack":        {DataType: MDTString, Value: verr.Stack},
+			},
+			Extra: make(map[string]any),
+		}
+	}
+
+	// A foreign error (eg a MongoDB exception)
+	return &ExErr{
+		UniqueID:       newID(),
+		Category:       CatForeign,
+		Type:           TypeInternal,
+		Severity:       SevErr,
+		Timestamp:      time.Time{},
+		StatusCode:     nil,
+		Message:        err.Error(),
+		WrappedErrType: fmt.Sprintf("%T", err),
+		WrappedErr:     err,
+		Caller:         "",
+		OriginalError:  nil,
+		Meta:           getForeignMeta(err),
+		Extra:          make(map[string]any),
+	}
+}
+
+func newExErr(cat ErrorCategory, errtype ErrorType, msg string) *ExErr {
+	return &ExErr{
+		UniqueID:       newID(),
+		Category:       cat,
+		Type:           errtype,
+		Severity:       SevErr,
+		Timestamp:      time.Now(),
+		StatusCode:     nil,
+		Message:        msg,
+		WrappedErrType: "",
+		WrappedErr:     nil,
+		Caller:         callername(2),
+		OriginalError:  nil,
+		Meta:           make(map[string]MetaValue),
+		Extra:          make(map[string]any),
+	}
+}
+
+func wrapExErr(e *ExErr, msg string, cat ErrorCategory, stacktraceskip int) *ExErr {
+	return &ExErr{
+		UniqueID:       newID(),
+		Category:       cat,
+		Type:           TypeWrap,
+		Severity:       e.Severity,
+		Timestamp:      time.Now(),
+		StatusCode:     e.StatusCode,
+		Message:        msg,
+		WrappedErrType: "",
+		WrappedErr:     nil,
+		Caller:         callername(1 + stacktraceskip),
+		OriginalError:  e,
+		Meta:           make(map[string]MetaValue),
+		Extra:          langext.CopyMap(langext.ForceMap(e.Extra)),
+	}
+}
+
+func getForeignMeta(err error) (mm MetaMap) {
+	mm = make(map[string]MetaValue)
+
+	defer func() {
+		if panicerr := recover(); panicerr != nil {
+			New(TypePanic, "Panic while trying to get foreign meta").
+				Str("source", err.Error()).
+				Interface("panic-object", panicerr).
+				Stack().
+				Print()
+		}
+	}()
+
+	rval := reflect.ValueOf(err)
+	if rval.Kind() == reflect.Interface || rval.Kind() == reflect.Ptr {
+		rval = reflect.ValueOf(err).Elem()
+	}
+
+	mm.add("foreign.errortype", MDTString, rval.Type().String())
+
+	for k, v := range addMetaPrefix("foreign", getReflectedMetaValues(err, 8)) {
+		mm[k] = v
+	}
+
+	return mm
+}
+
+func getReflectedMetaValues(value interface{}, remainingDepth int) map[string]MetaValue {
+
+	if remainingDepth <= 0 {
+		return map[string]MetaValue{}
+	}
+
+	if langext.IsNil(value) {
+		return map[string]MetaValue{"": {DataType: MDTNil, Value: nil}}
+	}
+
+	rval := reflect.ValueOf(value)
+
+	if rval.Type().Kind() == reflect.Ptr {
+
+		if rval.IsNil() {
+			return map[string]MetaValue{"*": {DataType: MDTNil, Value: nil}}
+		}
+
+		elem := rval.Elem()
+
+		return addMetaPrefix("*", getReflectedMetaValues(elem.Interface(), remainingDepth-1))
+	}
+
+	if !rval.CanInterface() {
+		return map[string]MetaValue{"": {DataType: MDTString, Value: "<<no-interface>>"}}
+	}
+
+	raw := rval.Interface()
+
+	switch ifraw := raw.(type) {
+	case time.Time:
+		return map[string]MetaValue{"": {DataType: MDTTime, Value: ifraw}}
+	case time.Duration:
+		return map[string]MetaValue{"": {DataType: MDTDuration, Value: ifraw}}
+	case int:
+		return map[string]MetaValue{"": {DataType: MDTInt, Value: ifraw}}
+	case int8:
+		return map[string]MetaValue{"": {DataType: MDTInt8, Value: ifraw}}
+	case int16:
+		return map[string]MetaValue{"": {DataType: MDTInt16, Value: ifraw}}
+	case int32:
+		return map[string]MetaValue{"": {DataType: MDTInt32, Value: ifraw}}
+	case int64:
+		return map[string]MetaValue{"": {DataType: MDTInt64, Value: ifraw}}
+	case string:
+		return map[string]MetaValue{"": {DataType: MDTString, Value: ifraw}}
+	case bool:
+		return map[string]MetaValue{"": {DataType: MDTBool, Value: ifraw}}
+	case []byte:
+		return map[string]MetaValue{"": {DataType: MDTBytes, Value: ifraw}}
+	case float32:
+		return map[string]MetaValue{"": {DataType: MDTFloat32, Value: ifraw}}
+	case float64:
+		return map[string]MetaValue{"": {DataType: MDTFloat64, Value: ifraw}}
+	case []int:
+		return map[string]MetaValue{"": {DataType: MDTIntArray, Value: ifraw}}
+	case []int32:
+		return map[string]MetaValue{"": {DataType: MDTInt32Array, Value: ifraw}}
+	case primitive.ObjectID:
+		return map[string]MetaValue{"": {DataType: MDTObjectID, Value: ifraw}}
+	case []string:
+		return map[string]MetaValue{"": {DataType: MDTStringArray, Value: ifraw}}
+	}
+
+	if rval.Type().Kind() == reflect.Struct {
+		m := make(map[string]MetaValue)
+		for i := 0; i < rval.NumField(); i++ {
+			fieldtype := rval.Type().Field(i)
+
+			fieldname := fieldtype.Name
+
+			if fieldtype.IsExported() {
+				for k, v := range addMetaPrefix(fieldname, getReflectedMetaValues(rval.Field(i).Interface(), remainingDepth-1)) {
+					m[k] = v
+				}
+			}
+		}
+		return m
+	}
+
+	if rval.Type().ConvertibleTo(reflectTypeStr) {
+		return map[string]MetaValue{"": {DataType: MDTString, Value: rval.Convert(reflectTypeStr).String()}}
+	}
+
+	jsonval, err := json.Marshal(value)
+	if err != nil {
+		return map[string]MetaValue{"": {DataType: MDTString, Value: fmt.Sprintf("Failed to Marshal %T:\n%+v", value, value)}}
+	}
+
+	return map[string]MetaValue{"": {DataType: MDTString, Value: string(jsonval)}}
+}
+
+func addMetaPrefix(prefix string, m map[string]MetaValue) map[string]MetaValue {
+	if len(m) == 1 {
+		for k, v := range m {
+			if k == "" {
+				return map[string]MetaValue{prefix: v}
+			}
+		}
+	}
+
+	r := make(map[string]MetaValue, len(m))
+	for k, v := range m {
+		r[prefix+"."+k] = v
+	}
+	return r
+}

exerr/data.go

@@ -0,0 +1,18 @@
+package exerr
+
+type Method string
+
+const (
+	MethodOutput Method = "OUTPUT"
+	MethodPrint  Method = "PRINT"
+	MethodBuild  Method = "BUILD"
+	MethodFatal  Method = "FATAL"
+)
+
+type LogPrintLevel string
+
+const (
+	LogPrintFull     LogPrintLevel = "Full"
+	LogPrintOverview LogPrintLevel = "Overview"
+	LogPrintShort    LogPrintLevel = "Short"
+)

exerr/dataCategory.go

@@ -0,0 +1,89 @@
+package exerr
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"reflect"
+)
+
+type ErrorCategory struct{ Category string }
+
+var (
+	CatWrap    = ErrorCategory{"Wrap"}    // The error is simply wrapping another error (e.g. when a grpc call returns an error)
+	CatSystem  = ErrorCategory{"System"}  // An internal system error (e.g. connection to db failed)
+	CatUser    = ErrorCategory{"User"}    // The user (the API caller) did something wrong (e.g. he has no permissions to do this)
+	CatForeign = ErrorCategory{"Foreign"} // A foreign error that some component threw (e.g. an unknown mongodb error), happens if we call Wrap(..) on an non-bmerror value
+)
+
+func (e *ErrorCategory) UnmarshalJSON(bytes []byte) error {
+	return json.Unmarshal(bytes, &e.Category)
+}
+
+func (e ErrorCategory) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.Category)
+}
+
+func (e *ErrorCategory) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
+	if bt == bson.TypeNull {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
+		*e = ErrorCategory{}
+		return nil
+	}
+	if bt != bson.TypeString {
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into String", bt))
+	}
+	var tt string
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
+	if err != nil {
+		return err
+	}
+	*e = ErrorCategory{tt}
+	return nil
+}
+
+func (e ErrorCategory) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	return bson.MarshalValue(e.Category)
+}
+
+func (e ErrorCategory) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = e.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&e))
+	} else {
+		val.Set(reflect.ValueOf(e))
+	}
+
+	return nil
+}
+
+//goland:noinspection GoUnusedGlobalVariable
+var AllCategories = []ErrorCategory{CatWrap, CatSystem, CatUser, CatForeign}

exerr/dataSeverity.go

@@ -0,0 +1,91 @@
+package exerr
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"reflect"
+)
+
+type ErrorSeverity struct{ Severity string }
+
+var (
+	SevTrace = ErrorSeverity{"Trace"}
+	SevDebug = ErrorSeverity{"Debug"}
+	SevInfo  = ErrorSeverity{"Info"}
+	SevWarn  = ErrorSeverity{"Warn"}
+	SevErr   = ErrorSeverity{"Err"}
+	SevFatal = ErrorSeverity{"Fatal"}
+)
+
+func (e *ErrorSeverity) UnmarshalJSON(bytes []byte) error {
+	return json.Unmarshal(bytes, &e.Severity)
+}
+
+func (e ErrorSeverity) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.Severity)
+}
+
+func (e *ErrorSeverity) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
+	if bt == bson.TypeNull {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
+		*e = ErrorSeverity{}
+		return nil
+	}
+	if bt != bson.TypeString {
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into String", bt))
+	}
+	var tt string
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
+	if err != nil {
+		return err
+	}
+	*e = ErrorSeverity{tt}
+	return nil
+}
+
+func (e ErrorSeverity) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	return bson.MarshalValue(e.Severity)
+}
+
+func (e ErrorSeverity) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = e.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&e))
+	} else {
+		val.Set(reflect.ValueOf(e))
+	}
+
+	return nil
+}
+
+//goland:noinspection GoUnusedGlobalVariable
+var AllSeverities = []ErrorSeverity{SevTrace, SevDebug, SevInfo, SevWarn, SevErr, SevFatal}

exerr/dataType.go

@@ -0,0 +1,159 @@
+package exerr
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/dataext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+)
+
+type ErrorType struct {
+	Key               string
+	DefaultStatusCode *int
+}
+
+//goland:noinspection GoUnusedGlobalVariable
+var (
+	TypeInternal       = NewType("INTERNAL_ERROR", langext.Ptr(500))
+	TypePanic          = NewType("PANIC", langext.Ptr(500))
+	TypeNotImplemented = NewType("NOT_IMPLEMENTED", langext.Ptr(500))
+	TypeAssert         = NewType("ASSERT", langext.Ptr(500))
+
+	TypeMongoQuery        = NewType("MONGO_QUERY", langext.Ptr(500))
+	TypeCursorTokenDecode = NewType("CURSOR_TOKEN_DECODE", langext.Ptr(500))
+	TypeMongoFilter       = NewType("MONGO_FILTER", langext.Ptr(500))
+	TypeMongoReflection   = NewType("MONGO_REFLECTION", langext.Ptr(500))
+	TypeMongoInvalidOpt   = NewType("MONGO_INVALIDOPT", langext.Ptr(500))
+
+	TypeSQLQuery  = NewType("SQL_QUERY", langext.Ptr(500))
+	TypeSQLBuild  = NewType("SQL_BUILD", langext.Ptr(500))
+	TypeSQLDecode = NewType("SQL_DECODE", langext.Ptr(500))
+
+	TypeWrap = NewType("Wrap", nil)
+
+	TypeBindFailURI      = NewType("BINDFAIL_URI", langext.Ptr(400))
+	TypeBindFailQuery    = NewType("BINDFAIL_QUERY", langext.Ptr(400))
+	TypeBindFailJSON     = NewType("BINDFAIL_JSON", langext.Ptr(400))
+	TypeBindFailFormData = NewType("BINDFAIL_FORMDATA", langext.Ptr(400))
+	TypeBindFailHeader   = NewType("BINDFAIL_HEADER", langext.Ptr(400))
+
+	TypeMarshalEntityID = NewType("MARSHAL_ENTITY_ID", langext.Ptr(400))
+	TypeInvalidCSID     = NewType("INVALID_CSID", langext.Ptr(400))
+
+	TypeGoogleStatuscode = NewType("GOOGLE_STATUSCODE", langext.Ptr(400))
+	TypeGoogleResponse   = NewType("GOOGLE_RESPONSE", langext.Ptr(400))
+
+	TypeUnauthorized = NewType("UNAUTHORIZED", langext.Ptr(401))
+	TypeAuthFailed   = NewType("AUTH_FAILED", langext.Ptr(401))
+
+	TypeInvalidImage    = NewType("IMAGEEXT_INVALID_IMAGE", langext.Ptr(400))
+	TypeInvalidMimeType = NewType("IMAGEEXT_INVALID_MIMETYPE", langext.Ptr(400))
+
+	TypeWebsocket = NewType("WEBSOCKET", langext.Ptr(500))
+
+	// other values come from the downstream application that uses goext
+)
+
+func (e *ErrorType) UnmarshalJSON(bytes []byte) error {
+	var k string
+	err := json.Unmarshal(bytes, &k)
+	if err != nil {
+		return err
+	}
+
+	if d, ok := registeredTypes.Get(k); ok {
+		*e = d
+		return nil
+	} else {
+		*e = ErrorType{k, nil}
+		return nil
+	}
+}
+
+func (e ErrorType) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.Key)
+}
+
+func (e *ErrorType) UnmarshalBSONValue(bt bsontype.Type, data []byte) error {
+	if bt == bson.TypeNull {
+		// we can't set nil in UnmarshalBSONValue (so we use default(struct))
+		// Use mongoext.CreateGoExtBsonRegistry if you need to unmarsh pointer values
+		// https://stackoverflow.com/questions/75167597
+		// https://jira.mongodb.org/browse/GODRIVER-2252
+		*e = ErrorType{}
+		return nil
+	}
+	if bt != bson.TypeString {
+		return errors.New(fmt.Sprintf("cannot unmarshal %v into String", bt))
+	}
+	var tt string
+	err := bson.RawValue{Type: bt, Value: data}.Unmarshal(&tt)
+	if err != nil {
+		return err
+	}
+
+	if d, ok := registeredTypes.Get(tt); ok {
+		*e = d
+		return nil
+	} else {
+		*e = ErrorType{tt, nil}
+		return nil
+	}
+}
+
+func (e ErrorType) MarshalBSONValue() (bsontype.Type, []byte, error) {
+	return bson.MarshalValue(e.Key)
+}
+
+func (e ErrorType) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		if !val.CanSet() {
+			return errors.New("ValueUnmarshalerDecodeValue")
+		}
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+
+	tp, src, err := bsonrw.Copier{}.CopyValueToBytes(vr)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr && len(src) == 0 {
+		val.Set(reflect.Zero(val.Type()))
+		return nil
+	}
+
+	err = e.UnmarshalBSONValue(tp, src)
+	if err != nil {
+		return err
+	}
+
+	if val.Kind() == reflect.Ptr {
+		val.Set(reflect.ValueOf(&e))
+	} else {
+		val.Set(reflect.ValueOf(e))
+	}
+
+	return nil
+}
+
+var registeredTypes = dataext.SyncMap[string, ErrorType]{}
+
+func NewType(key string, defStatusCode *int) ErrorType {
+	et := ErrorType{key, defStatusCode}
+
+	registeredTypes.Set(key, et)
+
+	return et
+}
+
+func ListRegisteredTypes() []ErrorType {
+	return registeredTypes.GetAllValues()
+}

exerr/data_test.go

@@ -0,0 +1,153 @@
+package exerr
+
+import (
+	"context"
+	"encoding/json"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"testing"
+	"time"
+)
+
+func TestJSONMarshalErrorCategory(t *testing.T) {
+
+	c1 := CatSystem
+
+	jsonbin := tst.Must(json.Marshal(c1))(t)
+
+	var c2 ErrorCategory
+	tst.AssertNoErr(t, json.Unmarshal(jsonbin, &c2))
+
+	tst.AssertEqual(t, c1, c2)
+
+	tst.AssertEqual(t, string(jsonbin), "\"System\"")
+}
+
+func TestJSONMarshalErrorSeverity(t *testing.T) {
+
+	c1 := SevErr
+
+	jsonbin := tst.Must(json.Marshal(c1))(t)
+
+	var c2 ErrorSeverity
+	tst.AssertNoErr(t, json.Unmarshal(jsonbin, &c2))
+
+	tst.AssertEqual(t, c1, c2)
+
+	tst.AssertEqual(t, string(jsonbin), "\"Err\"")
+}
+
+func TestJSONMarshalErrorType(t *testing.T) {
+
+	c1 := TypeNotImplemented
+
+	jsonbin := tst.Must(json.Marshal(c1))(t)
+
+	var c2 ErrorType
+	tst.AssertNoErr(t, json.Unmarshal(jsonbin, &c2))
+
+	tst.AssertEqual(t, c1, c2)
+
+	tst.AssertEqual(t, string(jsonbin), "\"NOT_IMPLEMENTED\"")
+}
+
+func TestBSONMarshalErrorCategory(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 350*time.Millisecond)
+	defer cancel()
+
+	client, err := mongo.Connect(ctx)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+	err = client.Ping(ctx, nil)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+
+	primimd := primitive.NewObjectID()
+
+	_, err = client.Database("_test").Collection("goext-cicd").InsertOne(ctx, bson.M{"_id": primimd, "val": CatSystem})
+	tst.AssertNoErr(t, err)
+
+	cursor := client.Database("_test").Collection("goext-cicd").FindOne(ctx, bson.M{"_id": primimd, "val": bson.M{"$type": "string"}})
+
+	var c1 struct {
+		ID  primitive.ObjectID `bson:"_id"`
+		Val ErrorCategory      `bson:"val"`
+	}
+
+	err = cursor.Decode(&c1)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertEqual(t, c1.Val, CatSystem)
+}
+
+func TestBSONMarshalErrorSeverity(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 350*time.Millisecond)
+	defer cancel()
+
+	client, err := mongo.Connect(ctx)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+	err = client.Ping(ctx, nil)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+
+	primimd := primitive.NewObjectID()
+
+	_, err = client.Database("_test").Collection("goext-cicd").InsertOne(ctx, bson.M{"_id": primimd, "val": SevErr})
+	tst.AssertNoErr(t, err)
+
+	cursor := client.Database("_test").Collection("goext-cicd").FindOne(ctx, bson.M{"_id": primimd, "val": bson.M{"$type": "string"}})
+
+	var c1 struct {
+		ID  primitive.ObjectID `bson:"_id"`
+		Val ErrorSeverity      `bson:"val"`
+	}
+
+	err = cursor.Decode(&c1)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertEqual(t, c1.Val, SevErr)
+}
+
+func TestBSONMarshalErrorType(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 350*time.Millisecond)
+	defer cancel()
+
+	client, err := mongo.Connect(ctx)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+	err = client.Ping(ctx, nil)
+	if err != nil {
+		t.Skip("Skip test - no local mongo found")
+		return
+	}
+
+	primimd := primitive.NewObjectID()
+
+	_, err = client.Database("_test").Collection("goext-cicd").InsertOne(ctx, bson.M{"_id": primimd, "val": TypeNotImplemented})
+	tst.AssertNoErr(t, err)
+
+	cursor := client.Database("_test").Collection("goext-cicd").FindOne(ctx, bson.M{"_id": primimd, "val": bson.M{"$type": "string"}})
+
+	var c1 struct {
+		ID  primitive.ObjectID `bson:"_id"`
+		Val ErrorType          `bson:"val"`
+	}
+
+	err = cursor.Decode(&c1)
+	tst.AssertNoErr(t, err)
+
+	tst.AssertEqual(t, c1.Val, TypeNotImplemented)
+}

exerr/errinit.go

@@ -0,0 +1,138 @@
+package exerr
+
+import (
+	"context"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog"
+	"net/http"
+	"os"
+)
+
+type ErrorPackageConfig struct {
+	ZeroLogErrTraces       bool                                                                     // autom print zerolog logs on .Build()  (for SevErr and SevFatal)
+	ZeroLogAllTraces       bool                                                                     // autom print zerolog logs on .Build()  (for all Severities)
+	RecursiveErrors        bool                                                                     // errors contains their Origin-Error
+	ExtendedGinOutput      bool                                                                     // Log extended data (trace, meta, ...) to gin in err.Output()
+	IncludeMetaInGinOutput bool                                                                     // Log meta fields ( from e.g. `.Str(key, val).Build()` ) to gin in err.Output()
+	ExtendGinOutput        func(err *ExErr, json map[string]any)                                    // (Optionally) extend the gin output with more fields
+	ExtendGinDataOutput    func(err *ExErr, depth int, json map[string]any)                         // (Optionally) extend the gin `__data` output with more fields
+	DisableErrorWrapping   bool                                                                     // Disables the exerr.Wrap()...Build() function - will always return the original error
+	ZeroLogErrGinOutput    bool                                                                     // autom print zerolog logs on ginext.Error() / .Output(gin)  (for SevErr and SevFatal)
+	ZeroLogAllGinOutput    bool                                                                     // autom print zerolog logs on ginext.Error() / .Output(gin)  (for all Severities)
+	ExtendGinMeta          func(ctx context.Context, b *Builder, g *gin.Context, req *http.Request) // (Optionally) extend the final error meta values with additional data from the gin context (a few are automatically added, here more can be included)
+	ExtendContextMeta      func(b *Builder, method Method, dctx context.Context)                    // (Optionally) extend the final error meta values with additional data from the context (a few are automatically added, here more can be included)
+	ZeroLogger             zerolog.Logger                                                           // The logger used to print exerr log messages
+}
+
+type ErrorPackageConfigInit struct {
+	ZeroLogErrTraces       *bool
+	ZeroLogAllTraces       *bool
+	RecursiveErrors        *bool
+	ExtendedGinOutput      *bool
+	IncludeMetaInGinOutput *bool
+	ExtendGinOutput        func(err *ExErr, json map[string]any)
+	ExtendGinDataOutput    func(err *ExErr, depth int, json map[string]any)
+	DisableErrorWrapping   *bool
+	ZeroLogErrGinOutput    *bool
+	ZeroLogAllGinOutput    *bool
+	ExtendGinMeta          func(ctx context.Context, b *Builder, g *gin.Context, req *http.Request)
+	ExtendContextMeta      func(b *Builder, method Method, dctx context.Context)
+	ZeroLogger             *zerolog.Logger
+}
+
+var initialized = false
+
+var pkgconfig = ErrorPackageConfig{
+	ZeroLogErrTraces:       true,
+	ZeroLogAllTraces:       false,
+	RecursiveErrors:        true,
+	ExtendedGinOutput:      false,
+	IncludeMetaInGinOutput: true,
+	ExtendGinOutput:        func(err *ExErr, json map[string]any) {},
+	ExtendGinDataOutput:    func(err *ExErr, depth int, json map[string]any) {},
+	DisableErrorWrapping:   false,
+	ZeroLogErrGinOutput:    true,
+	ZeroLogAllGinOutput:    false,
+	ExtendGinMeta:          func(ctx context.Context, b *Builder, g *gin.Context, req *http.Request) {},
+	ExtendContextMeta:      func(b *Builder, method Method, dctx context.Context) {},
+}
+
+// Init initializes the exerr packages
+// Must be called at the program start, before (!) any errors
+// Is not thread-safe
+func Init(cfg ErrorPackageConfigInit) {
+	if initialized {
+		panic("Cannot re-init error package")
+	}
+
+	ego := func(err *ExErr, json map[string]any) {}
+	egdo := func(err *ExErr, depth int, json map[string]any) {}
+	egm := func(ctx context.Context, b *Builder, g *gin.Context, req *http.Request) {}
+	egcm := func(b *Builder, method Method, dctx context.Context) {}
+
+	if cfg.ExtendGinOutput != nil {
+		ego = cfg.ExtendGinOutput
+	}
+	if cfg.ExtendGinDataOutput != nil {
+		egdo = cfg.ExtendGinDataOutput
+	}
+	if cfg.ExtendGinMeta != nil {
+		egm = cfg.ExtendGinMeta
+	}
+	if cfg.ExtendContextMeta != nil {
+		egcm = cfg.ExtendContextMeta
+	}
+
+	var logger zerolog.Logger
+	if cfg.ZeroLogger != nil {
+		logger = *cfg.ZeroLogger
+	} else {
+		logger = newDefaultLogger()
+	}
+
+	pkgconfig = ErrorPackageConfig{
+		ZeroLogErrTraces:       langext.Coalesce(cfg.ZeroLogErrTraces, pkgconfig.ZeroLogErrTraces),
+		ZeroLogAllTraces:       langext.Coalesce(cfg.ZeroLogAllTraces, pkgconfig.ZeroLogAllTraces),
+		RecursiveErrors:        langext.Coalesce(cfg.RecursiveErrors, pkgconfig.RecursiveErrors),
+		ExtendedGinOutput:      langext.Coalesce(cfg.ExtendedGinOutput, pkgconfig.ExtendedGinOutput),
+		IncludeMetaInGinOutput: langext.Coalesce(cfg.IncludeMetaInGinOutput, pkgconfig.IncludeMetaInGinOutput),
+		ExtendGinOutput:        ego,
+		ExtendGinDataOutput:    egdo,
+		DisableErrorWrapping:   langext.Coalesce(cfg.DisableErrorWrapping, pkgconfig.DisableErrorWrapping),
+		ZeroLogAllGinOutput:    langext.Coalesce(cfg.ZeroLogAllGinOutput, pkgconfig.ZeroLogAllGinOutput),
+		ZeroLogErrGinOutput:    langext.Coalesce(cfg.ZeroLogErrGinOutput, pkgconfig.ZeroLogErrGinOutput),
+		ExtendGinMeta:          egm,
+		ExtendContextMeta:      egcm,
+		ZeroLogger:             logger,
+	}
+
+	initialized = true
+}
+
+func newDefaultLogger() zerolog.Logger {
+	cw := zerolog.ConsoleWriter{
+		Out:        os.Stdout,
+		TimeFormat: "2006-01-02 15:04:05 Z07:00",
+	}
+
+	multi := zerolog.MultiLevelWriter(cw)
+
+	return zerolog.New(multi).With().Timestamp().CallerWithSkipFrameCount(5).Logger()
+}
+
+func Initialized() bool {
+	return initialized
+}
+
+func warnOnPkgConfigNotInitialized() {
+	if !initialized {
+		fmt.Printf("\n")
+		fmt.Printf("%s\n", langext.StrRepeat("=", 80))
+		fmt.Printf("%s\n", "[WARNING] exerr package used without initializiation")
+		fmt.Printf("%s\n", "          call exerr.Init() in your main() function")
+		fmt.Printf("%s\n", langext.StrRepeat("=", 80))
+		fmt.Printf("\n")
+	}
+}

exerr/exerr.go

@@ -0,0 +1,436 @@
+package exerr
+
+import (
+	"fmt"
+	"github.com/rs/xid"
+	"github.com/rs/zerolog"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"reflect"
+	"strings"
+	"time"
+)
+
+type ExErr struct {
+	UniqueID string `json:"uniqueID"`
+
+	Timestamp time.Time     `json:"timestamp"`
+	Category  ErrorCategory `json:"category"`
+	Severity  ErrorSeverity `json:"severity"`
+	Type      ErrorType     `json:"type"`
+
+	StatusCode *int `json:"statusCode"`
+
+	Message        string `json:"message"`
+	WrappedErrType string `json:"wrappedErrType"`
+	WrappedErr     any    `json:"-"`
+	Caller         string `json:"caller"`
+
+	OriginalError *ExErr `json:"originalError"`
+
+	Extra map[string]any `json:"extra"`
+	Meta  MetaMap        `json:"meta"`
+}
+
+func (ee *ExErr) Error() string {
+	return ee.RecursiveMessage()
+}
+
+// Unwrap must be implemented so that some error.XXX methods work
+func (ee *ExErr) Unwrap() error {
+	if ee.OriginalError == nil {
+
+		if ee.WrappedErr != nil {
+			if werr, ok := ee.WrappedErr.(error); ok {
+				return werr
+			}
+		}
+
+		return nil // this is neccessary - otherwise we return a wrapped nil and the `x == nil` comparison fails (= panic in errors.Is and other failures)
+	}
+	return ee.OriginalError
+}
+
+// Is must be implemented so that error.Is(x) works
+func (ee *ExErr) Is(e error) bool {
+	return IsFrom(ee, e)
+}
+
+// As must be implemented so that error.As(x) works
+//
+//goland:noinspection GoTypeAssertionOnErrors
+func (ee *ExErr) As(target any) bool {
+	if dstErr, ok := target.(*ExErr); ok {
+
+		if dst0, ok := ee.contains(dstErr); ok {
+			dstErr = dst0
+			return true
+		} else {
+			return false
+		}
+
+	} else {
+
+		val := reflect.ValueOf(target)
+
+		typStr := val.Type().Elem().String()
+
+		for curr := ee; curr != nil; curr = curr.OriginalError {
+			if curr.Category == CatForeign && curr.WrappedErrType == typStr && curr.WrappedErr != nil {
+				val.Elem().Set(reflect.ValueOf(curr.WrappedErr))
+				return true
+			}
+		}
+
+		return false
+	}
+}
+
+func (ee *ExErr) Log(evt *zerolog.Event) {
+	evt.Msg(ee.FormatLog(LogPrintFull))
+}
+
+func (ee *ExErr) FormatLog(lvl LogPrintLevel) string {
+
+	// [LogPrintShort]
+	//
+	// - Only print message and type
+	// - Used e.g. for logging to the console when Build is called
+	// - also used in Print() if level == Warn/Info
+	//
+	// [LogPrintOverview]
+	//
+	// - print message, extra and errortrace
+	//
+	// [LogPrintFull]
+	//
+	// - print full error, with meta and extra, and trace, etc
+	// - Used in Output() and Print()
+	//
+
+	if lvl == LogPrintShort {
+
+		msg := ee.Message
+		if msg == "" {
+			msg = ee.RecursiveMessage()
+		}
+		if ee.OriginalError != nil && ee.OriginalError.Category == CatForeign {
+			msg = msg + " (" + strings.ReplaceAll(ee.OriginalError.Message, "\n", " ") + ")"
+		}
+
+		if ee.Type != TypeWrap {
+			return "[" + ee.Type.Key + "] " + msg
+		} else {
+			return msg
+		}
+
+	} else if lvl == LogPrintOverview {
+
+		str := "[" + ee.RecursiveType().Key + "] <" + ee.UniqueID + "> " + strings.ReplaceAll(ee.RecursiveMessage(), "\n", " ") + "\n"
+
+		for exk, exv := range ee.Extra {
+			str += fmt.Sprintf(" # [[[ %s ==> %v ]]]\n", exk, exv)
+		}
+
+		indent := ""
+		for curr := ee; curr != nil; curr = curr.OriginalError {
+			indent += "  "
+
+			str += indent
+			str += "-> "
+			strmsg := strings.Trim(curr.Message, " \r\n\t")
+			if lbidx := strings.Index(curr.Message, "\n"); lbidx >= 0 {
+				strmsg = strmsg[0:lbidx]
+			}
+			strmsg = langext.StrLimit(strmsg, 61, "...")
+			str += strmsg
+			str += "\n"
+
+		}
+		return str
+
+	} else if lvl == LogPrintFull {
+
+		str := "[" + ee.RecursiveType().Key + "] <" + ee.UniqueID + "> " + strings.ReplaceAll(ee.RecursiveMessage(), "\n", " ") + "\n"
+
+		for exk, exv := range ee.Extra {
+			str += fmt.Sprintf(" # [[[ %s ==> %v ]]]\n", exk, exv)
+		}
+
+		indent := ""
+		for curr := ee; curr != nil; curr = curr.OriginalError {
+			indent += "  "
+
+			etype := curr.Type.Key
+			if curr.Type == TypeWrap {
+				etype = "~"
+			}
+
+			str += indent
+			str += "-> ["
+			str += etype
+			if curr.Category == CatForeign {
+				str += "|Foreign"
+			}
+			str += "] "
+			str += strings.ReplaceAll(curr.Message, "\n", " ")
+			if curr.Caller != "" {
+				str += " (@ "
+				str += curr.Caller
+				str += ")"
+			}
+			str += "\n"
+
+			if curr.Meta.Any() {
+				meta := indent + "   {" + curr.Meta.FormatOneLine(240) + "}"
+				if len(meta) < 200 {
+					str += meta
+					str += "\n"
+				} else {
+					str += curr.Meta.FormatMultiLine(indent+"   ", "  ", 1024)
+					str += "\n"
+				}
+			}
+		}
+		return str
+
+	} else {
+
+		return "[?[" + ee.UniqueID + "]?]"
+
+	}
+}
+
+func (ee *ExErr) ShortLog(evt *zerolog.Event) {
+	ee.Meta.Apply(evt, langext.Ptr(240)).Msg(ee.FormatLog(LogPrintShort))
+}
+
+// RecursiveMessage returns the message to show
+// = first error (top-down) that is not foreign/empty
+// = lowest level error (that is not empty)
+// = fallback to self.message
+func (ee *ExErr) RecursiveMessage() string {
+
+	// ==== [1] ==== first error (top-down) that is not wrapping/foreign/empty
+
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.Message != "" && curr.Category != CatForeign {
+			return curr.Message
+		}
+	}
+
+	// ==== [2] ==== lowest level error (that is not empty)
+
+	deepestMsg := ""
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.Message != "" {
+			deepestMsg = curr.Message
+		}
+	}
+	if deepestMsg != "" {
+		return deepestMsg
+	}
+
+	// ==== [3] ==== fallback to self.message
+
+	return ee.Message
+}
+
+// RecursiveType returns the statuscode to use
+// = first error (top-down) that is not wrapping/empty
+func (ee *ExErr) RecursiveType() ErrorType {
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.Type != TypeWrap {
+			return curr.Type
+		}
+
+	}
+
+	// fallback to self
+	return ee.Type
+}
+
+// RecursiveStatuscode returns the HTTP Statuscode to use
+// = first error (top-down) that has a statuscode set
+func (ee *ExErr) RecursiveStatuscode() *int {
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.StatusCode != nil {
+			return langext.Ptr(*curr.StatusCode)
+		}
+	}
+
+	return nil
+}
+
+// RecursiveCategory returns the ErrorCategory to use
+// = first error (top-down) that has a statuscode set
+func (ee *ExErr) RecursiveCategory() ErrorCategory {
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.Category != CatWrap {
+			return curr.Category
+		}
+	}
+
+	// fallback to <empty>
+	return ee.Category
+}
+
+// RecursiveMeta searches (top-down) for teh first error that has a meta value with teh specified key
+// and returns its value (or nil)
+func (ee *ExErr) RecursiveMeta(key string) *MetaValue {
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if metaval, ok := curr.Meta[key]; ok {
+			return langext.Ptr(metaval)
+		}
+	}
+
+	return nil
+}
+
+// Depth returns the depth of recursively contained errors
+func (ee *ExErr) Depth() int {
+	if ee.OriginalError == nil {
+		return 1
+	} else {
+		return ee.OriginalError.Depth() + 1
+	}
+}
+
+// GetMeta returns the meta value with the specified key
+// this method recurses through all wrapped errors and returns the first matching meta value
+func (ee *ExErr) GetMeta(key string) (any, bool) {
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if v, ok := curr.Meta[key]; ok {
+			return v.Value, true
+		}
+	}
+
+	return nil, false
+}
+
+// GetMetaString functions the same as GetMeta, but returns false if the type does not match
+func (ee *ExErr) GetMetaString(key string) (string, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(string); ok {
+			return v2, true
+		}
+	}
+	return "", false
+}
+
+func (ee *ExErr) GetMetaBool(key string) (bool, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(bool); ok {
+			return v2, true
+		}
+	}
+	return false, false
+}
+
+func (ee *ExErr) GetMetaInt(key string) (int, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(int); ok {
+			return v2, true
+		}
+	}
+	return 0, false
+}
+
+func (ee *ExErr) GetMetaFloat32(key string) (float32, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(float32); ok {
+			return v2, true
+		}
+	}
+	return 0, false
+}
+
+func (ee *ExErr) GetMetaFloat64(key string) (float64, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(float64); ok {
+			return v2, true
+		}
+	}
+	return 0, false
+}
+
+func (ee *ExErr) GetMetaTime(key string) (time.Time, bool) {
+	if v1, ok := ee.GetMeta(key); ok {
+		if v2, ok := v1.(time.Time); ok {
+			return v2, true
+		}
+	}
+	return time.Time{}, false
+}
+
+func (ee *ExErr) GetExtra(key string) (any, bool) {
+	if v, ok := ee.Extra[key]; ok {
+		return v, true
+	}
+
+	return nil, false
+}
+
+func (ee *ExErr) UniqueIDs() []string {
+	ids := make([]string, 0, 1)
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		ids = append(ids, curr.UniqueID)
+	}
+	return ids
+}
+
+// contains test if the supplied error is contained in this error (anywhere in the chain)
+func (ee *ExErr) contains(original *ExErr) (*ExErr, bool) {
+	if original == nil {
+		return nil, false
+	}
+
+	if ee == original {
+		return ee, true
+	}
+
+	for curr := ee; curr != nil; curr = curr.OriginalError {
+		if curr.equalsDirectProperties(curr) {
+			return curr, true
+		}
+	}
+
+	return nil, false
+}
+
+// equalsDirectProperties tests if ee and other are equals, but only looks at primary properties (not `OriginalError` or `Meta`)
+func (ee *ExErr) equalsDirectProperties(other *ExErr) bool {
+
+	if ee.UniqueID != other.UniqueID {
+		return false
+	}
+	if ee.Timestamp != other.Timestamp {
+		return false
+	}
+	if ee.Category != other.Category {
+		return false
+	}
+	if ee.Severity != other.Severity {
+		return false
+	}
+	if ee.Type != other.Type {
+		return false
+	}
+	if ee.StatusCode != other.StatusCode {
+		return false
+	}
+	if ee.Message != other.Message {
+		return false
+	}
+	if ee.WrappedErrType != other.WrappedErrType {
+		return false
+	}
+	if ee.Caller != other.Caller {
+		return false
+	}
+
+	return true
+}
+
+func newID() string {
+	return xid.New().String()
+}

exerr/exerr_test.go

@@ -0,0 +1,102 @@
+package exerr
+
+import (
+	"errors"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	if !Initialized() {
+		Init(ErrorPackageConfigInit{ZeroLogErrTraces: langext.PFalse, ZeroLogAllTraces: langext.PFalse})
+	}
+	os.Exit(m.Run())
+}
+
+type golangErr struct {
+	Message string
+}
+
+func (g golangErr) Error() string {
+	return g.Message
+}
+
+type golangErr2 struct {
+	Message string
+}
+
+func (g golangErr2) Error() string {
+	return g.Message
+}
+
+type simpleError struct {
+}
+
+func (g simpleError) Error() string {
+	return "Something simple went wroong"
+}
+
+type simpleError2 struct {
+}
+
+func (g simpleError2) Error() string {
+	return "Something simple went wroong"
+}
+
+func TestExErrIs1(t *testing.T) {
+	e0 := simpleError{}
+
+	wrap := Wrap(e0, "something went wrong").Str("test", "123").Build()
+
+	tst.AssertTrue(t, errors.Is(wrap, simpleError{}))
+	tst.AssertFalse(t, errors.Is(wrap, golangErr{}))
+	tst.AssertFalse(t, errors.Is(wrap, golangErr{"error1"}))
+}
+
+func TestExErrIs2(t *testing.T) {
+	e0 := golangErr{"error1"}
+
+	wrap := Wrap(e0, "something went wrong").Str("test", "123").Build()
+
+	tst.AssertTrue(t, errors.Is(wrap, e0))
+	tst.AssertTrue(t, errors.Is(wrap, golangErr{"error1"}))
+	tst.AssertFalse(t, errors.Is(wrap, golangErr{"error2"}))
+	tst.AssertFalse(t, errors.Is(wrap, simpleError{}))
+}
+
+func TestExErrAs(t *testing.T) {
+
+	e0 := golangErr{"error1"}
+
+	w0 := Wrap(e0, "something went wrong").Str("test", "123").Build()
+
+	{
+		out := golangErr{}
+		ok := errors.As(w0, &out)
+		tst.AssertTrue(t, ok)
+		tst.AssertEqual(t, out.Message, "error1")
+	}
+
+	w1 := Wrap(w0, "outher error").Build()
+
+	{
+		out := golangErr{}
+		ok := errors.As(w1, &out)
+		tst.AssertTrue(t, ok)
+		tst.AssertEqual(t, out.Message, "error1")
+	}
+
+	{
+		out := golangErr2{}
+		ok := errors.As(w1, &out)
+		tst.AssertFalse(t, ok)
+	}
+
+	{
+		out := simpleError2{}
+		ok := errors.As(w1, &out)
+		tst.AssertFalse(t, ok)
+	}
+}

exerr/gin.go

@@ -0,0 +1,175 @@
+package exerr
+
+import (
+	json "git.blackforestbytes.com/BlackForestBytes/goext/gojson"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"time"
+)
+
+func (ee *ExErr) toJson(depth int, applyExtendListener bool, outputMeta bool) langext.H {
+	ginJson := langext.H{}
+
+	if ee.UniqueID != "" {
+		ginJson["id"] = ee.UniqueID
+	}
+	if ee.Category != CatWrap {
+		ginJson["category"] = ee.Category.Category
+	}
+	if ee.Type != TypeWrap {
+		ginJson["type"] = ee.Type.Key
+	}
+	if ee.StatusCode != nil {
+		ginJson["statuscode"] = ee.StatusCode
+	}
+	if ee.Message != "" {
+		ginJson["message"] = ee.Message
+	}
+	if ee.Caller != "" {
+		ginJson["caller"] = ee.Caller
+	}
+	if ee.Severity != SevErr {
+		ginJson["severity"] = ee.Severity.Severity
+	}
+	if ee.Timestamp != (time.Time{}) {
+		ginJson["time"] = ee.Timestamp.Format(time.RFC3339)
+	}
+	if ee.WrappedErrType != "" {
+		ginJson["wrappedErrType"] = ee.WrappedErrType
+	}
+	if ee.OriginalError != nil {
+		ginJson["original"] = ee.OriginalError.toJson(depth+1, applyExtendListener, outputMeta)
+	}
+
+	if outputMeta {
+		metaJson := langext.H{}
+		for metaKey, metaVal := range ee.Meta {
+			metaJson[metaKey] = metaVal.rawValueForJson()
+		}
+		ginJson["meta"] = metaJson
+
+		extraJson := langext.H{}
+		for extraKey, extraVal := range ee.Extra {
+			extraJson[extraKey] = extraVal
+		}
+		ginJson["extra"] = extraJson
+	}
+
+	if applyExtendListener {
+		pkgconfig.ExtendGinDataOutput(ee, depth, ginJson)
+	}
+
+	return ginJson
+}
+
+func (ee *ExErr) ToDefaultAPIJson() (string, error) {
+
+	gjr := json.GoJsonRender{Data: ee.ToAPIJson(true, pkgconfig.ExtendedGinOutput, pkgconfig.IncludeMetaInGinOutput), NilSafeSlices: true, NilSafeMaps: true}
+
+	r, err := gjr.RenderString()
+	if err != nil {
+		return "", err
+	}
+
+	return r, nil
+}
+
+// ToAPIJson converts the ExError to a json object
+// (the same object as used in the Output(gin) method)
+//
+// Parameters:
+//   - [applyExtendListener]:  if false the pkgconfig.ExtendGinOutput / pkgconfig.ExtendGinDataOutput will not be applied
+//   - [includeWrappedErrors]: if false we do not include the recursive/wrapped errors in `__data`
+//   - [includeMetaFields]:    if true  we also include meta-values (aka from `.Str(key, value).Build()`), needs includeWrappedErrors=true
+func (ee *ExErr) ToAPIJson(applyExtendListener bool, includeWrappedErrors bool, includeMetaFields bool) langext.H {
+
+	apiOutput := langext.H{
+		"errorid":   ee.UniqueID,
+		"message":   ee.RecursiveMessage(),
+		"errorcode": ee.RecursiveType().Key,
+		"category":  ee.RecursiveCategory().Category,
+	}
+
+	if includeWrappedErrors {
+		apiOutput["__data"] = ee.toJson(0, applyExtendListener, includeMetaFields)
+	}
+
+	for exkey, exval := range ee.Extra {
+
+		// ensure we do not override existing values
+		for {
+			if _, ok := apiOutput[exkey]; ok {
+				exkey = "_" + exkey
+			} else {
+				break
+			}
+		}
+
+		apiOutput[exkey] = exval
+	}
+
+	if applyExtendListener {
+		pkgconfig.ExtendGinOutput(ee, apiOutput)
+	}
+
+	return apiOutput
+}
+
+func (ee *ExErr) Output(g *gin.Context) {
+
+	warnOnPkgConfigNotInitialized()
+
+	var statuscode = http.StatusInternalServerError
+
+	var baseCat = ee.RecursiveCategory()
+	var baseType = ee.RecursiveType()
+	var baseStatuscode = ee.RecursiveStatuscode()
+
+	if baseCat == CatUser {
+		statuscode = http.StatusBadRequest
+	} else if baseCat == CatSystem {
+		statuscode = http.StatusInternalServerError
+	}
+
+	if baseStatuscode != nil {
+		statuscode = *ee.StatusCode
+	} else if baseType.DefaultStatusCode != nil {
+		statuscode = *baseType.DefaultStatusCode
+	}
+
+	ginOutput := ee.ToAPIJson(true, pkgconfig.ExtendedGinOutput, pkgconfig.IncludeMetaInGinOutput)
+
+	g.Render(statuscode, json.GoJsonRender{Data: ginOutput, NilSafeSlices: true, NilSafeMaps: true})
+}
+
+func (ee *ExErr) OutputRaw(w http.ResponseWriter) {
+
+	warnOnPkgConfigNotInitialized()
+
+	var statuscode = http.StatusInternalServerError
+
+	var baseCat = ee.RecursiveCategory()
+	var baseType = ee.RecursiveType()
+	var baseStatuscode = ee.RecursiveStatuscode()
+
+	if baseCat == CatUser {
+		statuscode = http.StatusBadRequest
+	} else if baseCat == CatSystem {
+		statuscode = http.StatusInternalServerError
+	}
+
+	if baseStatuscode != nil {
+		statuscode = *ee.StatusCode
+	} else if baseType.DefaultStatusCode != nil {
+		statuscode = *baseType.DefaultStatusCode
+	}
+
+	ginOutput, err := ee.ToDefaultAPIJson()
+	if err != nil {
+		panic(err) // cannot happen
+	}
+
+	w.WriteHeader(statuscode)
+	_, _ = w.Write([]byte(ginOutput))
+}

exerr/helper.go

@@ -0,0 +1,126 @@
+package exerr
+
+import "fmt"
+
+// IsType test if the supplied error is of the specified ErrorType.
+func IsType(err error, errType ErrorType) bool {
+	if err == nil {
+		return false
+	}
+
+	bmerr := FromError(err)
+	for bmerr != nil {
+		if bmerr.Type == errType {
+			return true
+		}
+		bmerr = bmerr.OriginalError
+	}
+
+	return false
+}
+
+// IsFrom test if the supplied error stems originally from original
+func IsFrom(e error, original error) bool {
+	if e == nil {
+		return false
+	}
+
+	//goland:noinspection GoDirectComparisonOfErrors
+	if e == original {
+		return true
+	}
+
+	bmerr := FromError(e)
+	for bmerr == nil {
+		return false
+	}
+
+	for curr := bmerr; curr != nil; curr = curr.OriginalError {
+		if curr.Category == CatForeign && curr.Message == original.Error() && curr.WrappedErrType == fmt.Sprintf("%T", original) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// HasSourceMessage tests if the supplied error stems originally from an error with the message msg
+func HasSourceMessage(e error, msg string) bool {
+	if e == nil {
+		return false
+	}
+
+	bmerr := FromError(e)
+	for bmerr == nil {
+		return false
+	}
+
+	for curr := bmerr; curr != nil; curr = curr.OriginalError {
+		if curr.OriginalError == nil && curr.Message == msg {
+			return true
+		}
+	}
+
+	return false
+}
+
+func MessageMatch(e error, matcher func(string) bool) bool {
+	if e == nil {
+		return false
+	}
+
+	if matcher(e.Error()) {
+		return true
+	}
+
+	bmerr := FromError(e)
+	for bmerr == nil {
+		return false
+	}
+
+	for curr := bmerr; curr != nil; curr = curr.OriginalError {
+		if matcher(curr.Message) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// OriginalError returns the lowest level error, probably the original/external error that was originally wrapped
+func OriginalError(e error) error {
+	if e == nil {
+		return nil
+	}
+
+	//goland:noinspection GoTypeAssertionOnErrors
+	bmerr, ok := e.(*ExErr)
+	for !ok {
+		return e
+	}
+
+	for bmerr.OriginalError != nil {
+		bmerr = bmerr.OriginalError
+	}
+
+	if bmerr.WrappedErr != nil {
+		if werr, ok := bmerr.WrappedErr.(error); ok {
+			return werr
+		}
+	}
+
+	return bmerr
+}
+
+func UniqueID(v error) *string {
+	if v == nil {
+		return nil
+	}
+
+	//goland:noinspection GoTypeAssertionOnErrors
+	if verr, ok := v.(*ExErr); ok {
+		return &verr.UniqueID
+	}
+
+	return nil
+}

exerr/listener.go

@@ -0,0 +1,30 @@
+package exerr
+
+import (
+	"sync"
+)
+
+type ListenerOpt struct {
+	NoLog bool
+}
+
+type Listener = func(method Method, v *ExErr, opt ListenerOpt)
+
+var listenerLock = sync.Mutex{}
+var listener = make([]Listener, 0)
+
+func RegisterListener(l Listener) {
+	listenerLock.Lock()
+	defer listenerLock.Unlock()
+
+	listener = append(listener, l)
+}
+
+func (ee *ExErr) CallListener(m Method, opt ListenerOpt) {
+	listenerLock.Lock()
+	defer listenerLock.Unlock()
+
+	for _, v := range listener {
+		v(m, ee, opt)
+	}
+}

exerr/meta.go

@@ -0,0 +1,762 @@
+package exerr
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"github.com/rs/zerolog"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// This is a buffed up map[string]any
+// we also save type information of the map-values
+// which allows us to deserialize them back into te correct types later
+
+type MetaMap map[string]MetaValue
+
+type metaDataType string
+
+const (
+	MDTString      metaDataType = "String"
+	MDTStringPtr   metaDataType = "StringPtr"
+	MDTInt         metaDataType = "Int"
+	MDTInt8        metaDataType = "Int8"
+	MDTInt16       metaDataType = "Int16"
+	MDTInt32       metaDataType = "Int32"
+	MDTInt64       metaDataType = "Int64"
+	MDTFloat32     metaDataType = "Float32"
+	MDTFloat64     metaDataType = "Float64"
+	MDTBool        metaDataType = "Bool"
+	MDTBytes       metaDataType = "Bytes"
+	MDTObjectID    metaDataType = "ObjectID"
+	MDTTime        metaDataType = "Time"
+	MDTDuration    metaDataType = "Duration"
+	MDTStringArray metaDataType = "StringArr"
+	MDTIntArray    metaDataType = "IntArr"
+	MDTInt32Array  metaDataType = "Int32Arr"
+	MDTID          metaDataType = "ID"
+	MDTAny         metaDataType = "Interface"
+	MDTNil         metaDataType = "Nil"
+	MDTEnum        metaDataType = "Enum"
+)
+
+type MetaValue struct {
+	DataType metaDataType `json:"dataType"`
+	Value    interface{}  `json:"value"`
+}
+
+type metaValueSerialization struct {
+	DataType metaDataType `bson:"dataType"`
+	Value    string       `bson:"value"`
+	Raw      interface{}  `bson:"raw"`
+}
+
+func (v MetaValue) SerializeValue() (string, error) {
+	switch v.DataType {
+	case MDTString:
+		return v.Value.(string), nil
+	case MDTID:
+		return v.Value.(IDWrap).Serialize(), nil
+	case MDTAny:
+		return v.Value.(AnyWrap).Serialize(), nil
+	case MDTStringPtr:
+		if langext.IsNil(v.Value) {
+			return "#", nil
+		}
+		r := v.Value.(*string)
+		if r != nil {
+			return "*" + *r, nil
+		} else {
+			return "#", nil
+		}
+	case MDTInt:
+		return strconv.Itoa(v.Value.(int)), nil
+	case MDTInt8:
+		return strconv.FormatInt(int64(v.Value.(int8)), 10), nil
+	case MDTInt16:
+		return strconv.FormatInt(int64(v.Value.(int16)), 10), nil
+	case MDTInt32:
+		return strconv.FormatInt(int64(v.Value.(int32)), 10), nil
+	case MDTInt64:
+		return strconv.FormatInt(v.Value.(int64), 10), nil
+	case MDTFloat32:
+		return strconv.FormatFloat(float64(v.Value.(float32)), 'X', -1, 32), nil
+	case MDTFloat64:
+		return strconv.FormatFloat(v.Value.(float64), 'X', -1, 64), nil
+	case MDTBool:
+		if v.Value.(bool) {
+			return "true", nil
+		} else {
+			return "false", nil
+		}
+	case MDTBytes:
+		return hex.EncodeToString(v.Value.([]byte)), nil
+	case MDTObjectID:
+		return v.Value.(primitive.ObjectID).Hex(), nil
+	case MDTTime:
+		return strconv.FormatInt(v.Value.(time.Time).Unix(), 10) + "|" + strconv.FormatInt(int64(v.Value.(time.Time).Nanosecond()), 10), nil
+	case MDTDuration:
+		return v.Value.(time.Duration).String(), nil
+	case MDTStringArray:
+		if langext.IsNil(v.Value) {
+			return "#", nil
+		}
+		r, err := json.Marshal(v.Value.([]string))
+		if err != nil {
+			return "", err
+		}
+		return string(r), nil
+	case MDTIntArray:
+		if langext.IsNil(v.Value) {
+			return "#", nil
+		}
+		r, err := json.Marshal(v.Value.([]int))
+		if err != nil {
+			return "", err
+		}
+		return string(r), nil
+	case MDTInt32Array:
+		if langext.IsNil(v.Value) {
+			return "#", nil
+		}
+		r, err := json.Marshal(v.Value.([]int32))
+		if err != nil {
+			return "", err
+		}
+		return string(r), nil
+	case MDTNil:
+		return "", nil
+	case MDTEnum:
+		return v.Value.(EnumWrap).Serialize(), nil
+	}
+	return "", errors.New("Unknown type: " + string(v.DataType))
+}
+
+func (v MetaValue) ShortString(lim int) string {
+	switch v.DataType {
+	case MDTString:
+		r := strings.ReplaceAll(v.Value.(string), "\r", "")
+		r = strings.ReplaceAll(r, "\n", "\\n")
+		r = strings.ReplaceAll(r, "\t", "\\t")
+		return langext.StrLimit(r, lim, "...")
+	case MDTID:
+		return v.Value.(IDWrap).String()
+	case MDTAny:
+		return v.Value.(AnyWrap).String()
+	case MDTStringPtr:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r := langext.CoalesceString(v.Value.(*string), "<<null>>")
+		r = strings.ReplaceAll(r, "\r", "")
+		r = strings.ReplaceAll(r, "\n", "\\n")
+		r = strings.ReplaceAll(r, "\t", "\\t")
+		return langext.StrLimit(r, lim, "...")
+	case MDTInt:
+		return strconv.Itoa(v.Value.(int))
+	case MDTInt8:
+		return strconv.FormatInt(int64(v.Value.(int8)), 10)
+	case MDTInt16:
+		return strconv.FormatInt(int64(v.Value.(int16)), 10)
+	case MDTInt32:
+		return strconv.FormatInt(int64(v.Value.(int32)), 10)
+	case MDTInt64:
+		return strconv.FormatInt(v.Value.(int64), 10)
+	case MDTFloat32:
+		return strconv.FormatFloat(float64(v.Value.(float32)), 'g', 4, 32)
+	case MDTFloat64:
+		return strconv.FormatFloat(v.Value.(float64), 'g', 4, 64)
+	case MDTBool:
+		return fmt.Sprintf("%v", v.Value.(bool))
+	case MDTBytes:
+		return langext.StrLimit(hex.EncodeToString(v.Value.([]byte)), lim, "...")
+	case MDTObjectID:
+		return v.Value.(primitive.ObjectID).Hex()
+	case MDTTime:
+		return v.Value.(time.Time).Format(time.RFC3339)
+	case MDTDuration:
+		return v.Value.(time.Duration).String()
+	case MDTStringArray:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.Marshal(v.Value.([]string))
+		if err != nil {
+			return "(err)"
+		}
+		return langext.StrLimit(string(r), lim, "...")
+	case MDTIntArray:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.Marshal(v.Value.([]int))
+		if err != nil {
+			return "(err)"
+		}
+		return langext.StrLimit(string(r), lim, "...")
+	case MDTInt32Array:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.Marshal(v.Value.([]int32))
+		if err != nil {
+			return "(err)"
+		}
+		return langext.StrLimit(string(r), lim, "...")
+	case MDTNil:
+		return "<<null>>"
+	case MDTEnum:
+		return v.Value.(EnumWrap).String()
+	}
+	return "(err)"
+}
+
+func (v MetaValue) Apply(key string, evt *zerolog.Event, limitLen *int) *zerolog.Event {
+	switch v.DataType {
+	case MDTString:
+		if limitLen == nil {
+			return evt.Str(key, v.Value.(string))
+		} else {
+			return evt.Str(key, langext.StrLimit(v.Value.(string), *limitLen, "..."))
+		}
+	case MDTID:
+		return evt.Str(key, v.Value.(IDWrap).Value)
+	case MDTAny:
+		if v.Value.(AnyWrap).IsError {
+			return evt.Str(key, "(err)")
+		} else {
+			if limitLen == nil {
+				return evt.Str(key, v.Value.(AnyWrap).Json)
+			} else {
+				return evt.Str(key, langext.StrLimit(v.Value.(AnyWrap).Json, *limitLen, "..."))
+			}
+		}
+	case MDTStringPtr:
+		if langext.IsNil(v.Value) {
+			return evt.Str(key, "<<null>>")
+		}
+		if limitLen == nil {
+			return evt.Str(key, langext.CoalesceString(v.Value.(*string), "<<null>>"))
+		} else {
+			return evt.Str(key, langext.StrLimit(langext.CoalesceString(v.Value.(*string), "<<null>>"), *limitLen, "..."))
+		}
+	case MDTInt:
+		return evt.Int(key, v.Value.(int))
+	case MDTInt8:
+		return evt.Int8(key, v.Value.(int8))
+	case MDTInt16:
+		return evt.Int16(key, v.Value.(int16))
+	case MDTInt32:
+		return evt.Int32(key, v.Value.(int32))
+	case MDTInt64:
+		return evt.Int64(key, v.Value.(int64))
+	case MDTFloat32:
+		return evt.Float32(key, v.Value.(float32))
+	case MDTFloat64:
+		return evt.Float64(key, v.Value.(float64))
+	case MDTBool:
+		return evt.Bool(key, v.Value.(bool))
+	case MDTBytes:
+		return evt.Bytes(key, v.Value.([]byte))
+	case MDTObjectID:
+		return evt.Str(key, v.Value.(primitive.ObjectID).Hex())
+	case MDTTime:
+		return evt.Time(key, v.Value.(time.Time))
+	case MDTDuration:
+		return evt.Dur(key, v.Value.(time.Duration))
+	case MDTStringArray:
+		if langext.IsNil(v.Value) {
+			return evt.Strs(key, nil)
+		}
+		return evt.Strs(key, v.Value.([]string))
+	case MDTIntArray:
+		if langext.IsNil(v.Value) {
+			return evt.Ints(key, nil)
+		}
+		return evt.Ints(key, v.Value.([]int))
+	case MDTInt32Array:
+		if langext.IsNil(v.Value) {
+			return evt.Ints32(key, nil)
+		}
+		return evt.Ints32(key, v.Value.([]int32))
+	case MDTNil:
+		return evt.Str(key, "<<null>>")
+	case MDTEnum:
+		if v.Value.(EnumWrap).IsNil {
+			return evt.Any(key, nil)
+		} else if v.Value.(EnumWrap).ValueRaw != nil {
+			return evt.Any(key, v.Value.(EnumWrap).ValueRaw)
+		} else {
+			return evt.Str(key, v.Value.(EnumWrap).ValueString)
+		}
+	}
+	return evt.Str(key, "(err)")
+}
+
+func (v MetaValue) MarshalJSON() ([]byte, error) {
+	str, err := v.SerializeValue()
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(string(v.DataType) + ":" + str)
+}
+
+func (v *MetaValue) UnmarshalJSON(data []byte) error {
+	var str = ""
+	err := json.Unmarshal(data, &str)
+	if err != nil {
+		return err
+	}
+
+	split := strings.SplitN(str, ":", 2)
+	if len(split) != 2 {
+		return errors.New("failed to decode MetaValue: '" + str + "'")
+	}
+
+	return v.Deserialize(split[1], metaDataType(split[0]))
+}
+
+func (v MetaValue) MarshalBSON() ([]byte, error) {
+	serval, err := v.SerializeValue()
+	if err != nil {
+		return nil, Wrap(err, "failed to bson-marshal MetaValue (serialize)").Build()
+	}
+
+	// this is an kinda ugly hack - but serialization to mongodb and back can loose the correct type information....
+	bin, err := bson.Marshal(metaValueSerialization{
+		DataType: v.DataType,
+		Value:    serval,
+		Raw:      v.Value,
+	})
+	if err != nil {
+		return nil, Wrap(err, "failed to bson-marshal MetaValue (marshal)").Build()
+	}
+
+	return bin, nil
+}
+
+func (v *MetaValue) UnmarshalBSON(bytes []byte) error {
+	var serval metaValueSerialization
+	err := bson.Unmarshal(bytes, &serval)
+	if err != nil {
+		return Wrap(err, "failed to bson-unmarshal MetaValue (unmarshal)").Build()
+	}
+
+	err = v.Deserialize(serval.Value, serval.DataType)
+	if err != nil {
+		return Wrap(err, "failed to deserialize MetaValue from bson").Str("raw", serval.Value).Build()
+	}
+
+	return nil
+}
+
+func (v *MetaValue) Deserialize(value string, datatype metaDataType) error {
+	switch datatype {
+	case MDTString:
+		v.Value = value
+		v.DataType = datatype
+		return nil
+	case MDTID:
+		v.Value = deserializeIDWrap(value)
+		v.DataType = datatype
+		return nil
+	case MDTAny:
+		v.Value = deserializeAnyWrap(value)
+		v.DataType = datatype
+		return nil
+	case MDTStringPtr:
+		if len(value) <= 0 || (value[0] != '*' && value[0] != '#') {
+			return errors.New("Invalid StringPtr: " + value)
+		} else if value == "#" {
+			v.Value = nil
+			v.DataType = datatype
+			return nil
+		} else {
+			v.Value = langext.Ptr(value[1:])
+			v.DataType = datatype
+			return nil
+		}
+	case MDTInt:
+		pv, err := strconv.ParseInt(value, 10, 0)
+		if err != nil {
+			return err
+		}
+		v.Value = int(pv)
+		v.DataType = datatype
+		return nil
+	case MDTInt8:
+		pv, err := strconv.ParseInt(value, 10, 8)
+		if err != nil {
+			return err
+		}
+		v.Value = int8(pv)
+		v.DataType = datatype
+		return nil
+	case MDTInt16:
+		pv, err := strconv.ParseInt(value, 10, 16)
+		if err != nil {
+			return err
+		}
+		v.Value = int16(pv)
+		v.DataType = datatype
+		return nil
+	case MDTInt32:
+		pv, err := strconv.ParseInt(value, 10, 32)
+		if err != nil {
+			return err
+		}
+		v.Value = int32(pv)
+		v.DataType = datatype
+		return nil
+	case MDTInt64:
+		pv, err := strconv.ParseInt(value, 10, 64)
+		if err != nil {
+			return err
+		}
+		v.Value = pv
+		v.DataType = datatype
+		return nil
+	case MDTFloat32:
+		pv, err := strconv.ParseFloat(value, 64)
+		if err != nil {
+			return err
+		}
+		v.Value = float32(pv)
+		v.DataType = datatype
+		return nil
+	case MDTFloat64:
+		pv, err := strconv.ParseFloat(value, 64)
+		if err != nil {
+			return err
+		}
+		v.Value = pv
+		v.DataType = datatype
+		return nil
+	case MDTBool:
+		if value == "true" {
+			v.Value = true
+			v.DataType = datatype
+			return nil
+		}
+		if value == "false" {
+			v.Value = false
+			v.DataType = datatype
+			return nil
+		}
+		return errors.New("invalid bool value: " + value)
+	case MDTBytes:
+		r, err := hex.DecodeString(value)
+		if err != nil {
+			return err
+		}
+		v.Value = r
+		v.DataType = datatype
+		return nil
+	case MDTObjectID:
+		r, err := primitive.ObjectIDFromHex(value)
+		if err != nil {
+			return err
+		}
+		v.Value = r
+		v.DataType = datatype
+		return nil
+	case MDTTime:
+		ps := strings.Split(value, "|")
+		if len(ps) != 2 {
+			return errors.New("invalid time.time: " + value)
+		}
+		p1, err := strconv.ParseInt(ps[0], 10, 64)
+		if err != nil {
+			return err
+		}
+		p2, err := strconv.ParseInt(ps[1], 10, 32)
+		if err != nil {
+			return err
+		}
+		v.Value = time.Unix(p1, p2)
+		v.DataType = datatype
+		return nil
+	case MDTDuration:
+		r, err := time.ParseDuration(value)
+		if err != nil {
+			return err
+		}
+		v.Value = r
+		v.DataType = datatype
+		return nil
+	case MDTStringArray:
+		if value == "#" {
+			v.Value = nil
+			v.DataType = datatype
+			return nil
+		}
+		pj := make([]string, 0)
+		err := json.Unmarshal([]byte(value), &pj)
+		if err != nil {
+			return err
+		}
+		v.Value = pj
+		v.DataType = datatype
+		return nil
+	case MDTIntArray:
+		if value == "#" {
+			v.Value = nil
+			v.DataType = datatype
+			return nil
+		}
+		pj := make([]int, 0)
+		err := json.Unmarshal([]byte(value), &pj)
+		if err != nil {
+			return err
+		}
+		v.Value = pj
+		v.DataType = datatype
+		return nil
+	case MDTInt32Array:
+		if value == "#" {
+			v.Value = nil
+			v.DataType = datatype
+			return nil
+		}
+		pj := make([]int32, 0)
+		err := json.Unmarshal([]byte(value), &pj)
+		if err != nil {
+			return err
+		}
+		v.Value = pj
+		v.DataType = datatype
+		return nil
+	case MDTNil:
+		v.Value = nil
+		v.DataType = datatype
+		return nil
+	case MDTEnum:
+		v.Value = deserializeEnumWrap(value)
+		v.DataType = datatype
+		return nil
+	}
+	return errors.New("Unknown type: " + string(datatype))
+}
+
+func (v MetaValue) ValueString() string {
+	switch v.DataType {
+	case MDTString:
+		return v.Value.(string)
+	case MDTID:
+		return v.Value.(IDWrap).String()
+	case MDTAny:
+		return v.Value.(AnyWrap).String()
+	case MDTStringPtr:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		return langext.CoalesceString(v.Value.(*string), "<<null>>")
+	case MDTInt:
+		return strconv.Itoa(v.Value.(int))
+	case MDTInt8:
+		return strconv.FormatInt(int64(v.Value.(int8)), 10)
+	case MDTInt16:
+		return strconv.FormatInt(int64(v.Value.(int16)), 10)
+	case MDTInt32:
+		return strconv.FormatInt(int64(v.Value.(int32)), 10)
+	case MDTInt64:
+		return strconv.FormatInt(v.Value.(int64), 10)
+	case MDTFloat32:
+		return strconv.FormatFloat(float64(v.Value.(float32)), 'g', 4, 32)
+	case MDTFloat64:
+		return strconv.FormatFloat(v.Value.(float64), 'g', 4, 64)
+	case MDTBool:
+		return fmt.Sprintf("%v", v.Value.(bool))
+	case MDTBytes:
+		return hex.EncodeToString(v.Value.([]byte))
+	case MDTObjectID:
+		return v.Value.(primitive.ObjectID).Hex()
+	case MDTTime:
+		return v.Value.(time.Time).Format(time.RFC3339Nano)
+	case MDTDuration:
+		return v.Value.(time.Duration).String()
+	case MDTStringArray:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.MarshalIndent(v.Value.([]string), "", "  ")
+		if err != nil {
+			return "(err)"
+		}
+		return string(r)
+	case MDTIntArray:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.MarshalIndent(v.Value.([]int), "", "  ")
+		if err != nil {
+			return "(err)"
+		}
+		return string(r)
+	case MDTInt32Array:
+		if langext.IsNil(v.Value) {
+			return "<<null>>"
+		}
+		r, err := json.MarshalIndent(v.Value.([]int32), "", "  ")
+		if err != nil {
+			return "(err)"
+		}
+		return string(r)
+	case MDTNil:
+		return "<<null>>"
+	case MDTEnum:
+		return v.Value.(EnumWrap).String()
+	}
+	return "(err)"
+}
+
+// rawValueForJson returns most-of-the-time the `Value` field
+// but for some datatyes we do special processing
+// all, so we can pluck the output value in json.Marshal without any suprises
+func (v MetaValue) rawValueForJson() any {
+	if v.DataType == MDTAny {
+		if v.Value.(AnyWrap).IsNil {
+			return nil
+		}
+		if v.Value.(AnyWrap).IsError {
+			return bson.M{"@error": true}
+		}
+		jsonobj := primitive.M{}
+		jsonarr := primitive.A{}
+		if err := json.Unmarshal([]byte(v.Value.(AnyWrap).Json), &jsonobj); err == nil {
+			return jsonobj
+		} else if err := json.Unmarshal([]byte(v.Value.(AnyWrap).Json), &jsonarr); err == nil {
+			return jsonarr
+		} else {
+			return bson.M{"type": v.Value.(AnyWrap).Type, "data": v.Value.(AnyWrap).Json}
+		}
+	}
+	if v.DataType == MDTID {
+		if v.Value.(IDWrap).IsNil {
+			return nil
+		}
+		return v.Value.(IDWrap).Value
+	}
+	if v.DataType == MDTBytes {
+		return hex.EncodeToString(v.Value.([]byte))
+	}
+	if v.DataType == MDTDuration {
+		return v.Value.(time.Duration).String()
+	}
+	if v.DataType == MDTTime {
+		return v.Value.(time.Time).Format(time.RFC3339Nano)
+	}
+	if v.DataType == MDTObjectID {
+		return v.Value.(primitive.ObjectID).Hex()
+	}
+	if v.DataType == MDTNil {
+		return nil
+	}
+	if v.DataType == MDTEnum {
+		if v.Value.(EnumWrap).IsNil {
+			return nil
+		}
+		if v.Value.(EnumWrap).ValueRaw != nil {
+			return v.Value.(EnumWrap).ValueRaw
+		}
+		return v.Value.(EnumWrap).ValueString
+	}
+	if v.DataType == MDTFloat32 {
+		if math.IsNaN(float64(v.Value.(float32))) {
+			return "float64::NaN"
+		} else if math.IsInf(float64(v.Value.(float32)), +1) {
+			return "float64::+inf"
+		} else if math.IsInf(float64(v.Value.(float32)), -1) {
+			return "float64::-inf"
+		} else {
+			return v.Value
+		}
+	}
+	if v.DataType == MDTFloat64 {
+		if math.IsNaN(v.Value.(float64)) {
+			return "float64::NaN"
+		} else if math.IsInf(v.Value.(float64), +1) {
+			return "float64::+inf"
+		} else if math.IsInf(v.Value.(float64), -1) {
+			return "float64::-inf"
+		} else {
+			return v.Value
+		}
+	}
+	return v.Value
+}
+
+func (mm MetaMap) FormatOneLine(singleMaxLen int) string {
+	r := ""
+
+	i := 0
+	for key, val := range mm {
+		if i > 0 {
+			r += ", "
+		}
+
+		r += "\"" + key + "\""
+		r += ": "
+		r += "\"" + val.ShortString(singleMaxLen) + "\""
+
+		i++
+	}
+
+	return r
+}
+
+func (mm MetaMap) FormatMultiLine(indentFront string, indentKeys string, maxLenValue int) string {
+	r := ""
+
+	r += indentFront + "{" + "\n"
+	for key, val := range mm {
+		if key == "gin.body" {
+			continue
+		}
+		if key == "gin_body" {
+			continue
+		}
+
+		r += indentFront
+		r += indentKeys
+		r += "\"" + key + "\""
+		r += ": "
+		r += "\"" + val.ShortString(maxLenValue) + "\""
+		r += ",\n"
+	}
+	r += indentFront + "}"
+
+	return r
+}
+
+func (mm MetaMap) Any() bool {
+	return len(mm) > 0
+}
+
+func (mm MetaMap) Apply(evt *zerolog.Event, limitLen *int) *zerolog.Event {
+	for key, val := range mm {
+		evt = val.Apply(key, evt, limitLen)
+	}
+	return evt
+}
+
+func (mm MetaMap) add(key string, mdtype metaDataType, val interface{}) {
+	if _, ok := mm[key]; !ok {
+		mm[key] = MetaValue{DataType: mdtype, Value: val}
+		return
+	}
+	for i := 2; ; i++ {
+		realkey := key + "-" + strconv.Itoa(i)
+		if _, ok := mm[realkey]; !ok {
+			mm[realkey] = MetaValue{DataType: mdtype, Value: val}
+			return
+		}
+	}
+}

exerr/proxy.go

@@ -0,0 +1,13 @@
+package exerr
+
+type Proxy struct {
+	v ExErr
+}
+
+func (p *Proxy) UniqueID() string {
+	return p.v.UniqueID
+}
+
+func (p *Proxy) Get() ExErr {
+	return p.v
+}

exerr/stacktrace.go

@@ -0,0 +1,14 @@
+package exerr
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func callername(skip int) string {
+	pc := make([]uintptr, 15)
+	n := runtime.Callers(skip+2, pc)
+	frames := runtime.CallersFrames(pc[:n])
+	frame, _ := frames.Next()
+	return fmt.Sprintf("%s:%d %s", frame.File, frame.Line, frame.Function)
+}

exerr/typeWrapper.go

@@ -0,0 +1,189 @@
+package exerr
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/rs/zerolog/log"
+	"git.blackforestbytes.com/BlackForestBytes/goext/enums"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"strings"
+)
+
+//
+// These are wrapper objects, because for some metadata-types we need to serialize a bit more complex data
+// (eg thy actual type for ID objects, or the json representation for any types)
+//
+
+type IDWrap struct {
+	Type  string
+	Value string
+	IsNil bool
+}
+
+func newIDWrap(val fmt.Stringer) IDWrap {
+	t := fmt.Sprintf("%T", val)
+	arr := strings.Split(t, ".")
+	if len(arr) > 0 {
+		t = arr[len(arr)-1]
+	}
+
+	if langext.IsNil(val) {
+		return IDWrap{Type: t, Value: "", IsNil: true}
+	}
+
+	v := val.String()
+	return IDWrap{Type: t, Value: v, IsNil: false}
+}
+
+func (w IDWrap) Serialize() string {
+	if w.IsNil {
+		return "!nil" + ":" + w.Type
+	}
+	return w.Type + ":" + w.Value
+}
+
+func (w IDWrap) String() string {
+	if w.IsNil {
+		return w.Type + "<<nil>>"
+	}
+	return w.Type + "(" + w.Value + ")"
+}
+
+func deserializeIDWrap(v string) IDWrap {
+	r := strings.SplitN(v, ":", 2)
+
+	if len(r) == 2 && r[0] == "!nil" {
+		return IDWrap{Type: r[1], Value: v, IsNil: true}
+	}
+
+	if len(r) == 0 {
+		return IDWrap{}
+	} else if len(r) == 1 {
+		return IDWrap{Type: "", Value: v, IsNil: false}
+	} else {
+		return IDWrap{Type: r[0], Value: r[1], IsNil: false}
+	}
+}
+
+type AnyWrap struct {
+	Type    string
+	Json    string
+	IsError bool
+	IsNil   bool
+}
+
+func newAnyWrap(val any) (result AnyWrap) {
+	result = AnyWrap{Type: "", Json: "", IsError: true, IsNil: false} // ensure a return in case of recover()
+
+	defer func() {
+		if err := recover(); err != nil {
+			// send error should never crash our program
+			log.Error().Interface("err", err).Msg("Panic while trying to marshal anywrap ( bmerror.Interface )")
+		}
+	}()
+
+	t := fmt.Sprintf("%T", val)
+
+	if langext.IsNil(val) {
+		return AnyWrap{Type: t, Json: "", IsError: false, IsNil: true}
+	}
+
+	j, err := json.Marshal(val)
+	if err == nil {
+		return AnyWrap{Type: t, Json: string(j), IsError: false, IsNil: false}
+	} else {
+		return AnyWrap{Type: t, Json: "", IsError: true, IsNil: false}
+	}
+}
+
+func (w AnyWrap) Serialize() string {
+	if w.IsError {
+		return "ERR" + ":" + w.Type + ":" + w.Json
+	} else if w.IsNil {
+		return "NIL" + ":" + w.Type + ":" + w.Json
+	} else {
+		return "OK" + ":" + w.Type + ":" + w.Json
+	}
+}
+
+func (w AnyWrap) String() string {
+	if w.IsError {
+		return "(error)"
+	} else if w.IsNil {
+		return "(nil)"
+	} else {
+		return w.Json
+	}
+}
+
+func deserializeAnyWrap(v string) AnyWrap {
+	r := strings.SplitN(v, ":", 3)
+	if len(r) != 3 {
+		return AnyWrap{IsError: true, Type: "", Json: "", IsNil: false}
+	} else {
+		if r[0] == "OK" {
+			return AnyWrap{IsError: false, Type: r[1], Json: r[2], IsNil: false}
+		} else if r[0] == "ERR" {
+			return AnyWrap{IsError: true, Type: r[1], Json: r[2], IsNil: false}
+		} else if r[0] == "NIL" {
+			return AnyWrap{IsError: false, Type: r[1], Json: "", IsNil: true}
+		} else {
+			return AnyWrap{IsError: true, Type: "", Json: "", IsNil: false}
+		}
+	}
+}
+
+type EnumWrap struct {
+	Type        string
+	ValueString string
+	ValueRaw    enums.Enum // `ValueRaw` is lost during serialization roundtrip
+	IsNil       bool
+}
+
+func newEnumWrap(val enums.Enum) EnumWrap {
+	t := fmt.Sprintf("%T", val)
+	arr := strings.Split(t, ".")
+	if len(arr) > 0 {
+		t = arr[len(arr)-1]
+	}
+
+	if langext.IsNil(val) {
+		return EnumWrap{Type: t, ValueString: "", ValueRaw: val, IsNil: true}
+	}
+
+	if enumstr, ok := val.(enums.StringEnum); ok {
+		return EnumWrap{Type: t, ValueString: enumstr.String(), ValueRaw: val, IsNil: false}
+	}
+
+	return EnumWrap{Type: t, ValueString: fmt.Sprintf("%v", val), ValueRaw: val, IsNil: false}
+}
+
+func (w EnumWrap) Serialize() string {
+	if w.IsNil {
+		return "!nil" + ":" + w.Type
+	}
+	return w.Type + ":" + w.ValueString
+}
+
+func (w EnumWrap) String() string {
+	if w.IsNil {
+		return w.Type + "<<nil>>"
+	}
+	return "[" + w.Type + "] " + w.ValueString
+}
+
+func deserializeEnumWrap(v string) EnumWrap {
+	r := strings.SplitN(v, ":", 2)
+
+	if len(r) == 2 && r[0] == "!nil" {
+		return EnumWrap{Type: r[1], ValueString: v, ValueRaw: nil, IsNil: true}
+	}
+
+	if len(r) == 0 {
+		return EnumWrap{}
+	} else if len(r) == 1 {
+		return EnumWrap{Type: "", ValueString: v, ValueRaw: nil, IsNil: false}
+	} else {
+		return EnumWrap{Type: r[0], ValueString: r[1], ValueRaw: nil, IsNil: false}
+	}
+}

fsext/exists.go

@@ -0,0 +1,36 @@
+package fsext
+
+import "os"
+
+func PathExists(fp string) (bool, error) {
+	_, err := os.Stat(fp)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}
+
+func FileExists(fp string) (bool, error) {
+	stat, err := os.Stat(fp)
+	if err == nil {
+		return !stat.IsDir(), nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}
+
+func DirectoryExists(fp string) (bool, error) {
+	stat, err := os.Stat(fp)
+	if err == nil {
+		return stat.IsDir(), nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}

ginext/appContext.go

@@ -0,0 +1,68 @@
+package ginext
+
+import (
+	"context"
+	"github.com/gin-gonic/gin"
+	"time"
+)
+
+type AppContext struct {
+	inner      context.Context
+	cancelFunc context.CancelFunc
+	cancelled  bool
+	GinContext *gin.Context
+}
+
+func CreateAppContext(g *gin.Context, innerCtx context.Context, cancelFn context.CancelFunc) *AppContext {
+	for key, value := range g.Keys {
+		innerCtx = context.WithValue(innerCtx, key, value)
+	}
+	return &AppContext{
+		inner:      innerCtx,
+		cancelFunc: cancelFn,
+		cancelled:  false,
+		GinContext: g,
+	}
+}
+
+func CreateBackgroundAppContext() *AppContext {
+	return &AppContext{
+		inner:      context.Background(),
+		cancelFunc: nil,
+		cancelled:  false,
+		GinContext: nil,
+	}
+}
+
+func (ac *AppContext) Deadline() (deadline time.Time, ok bool) {
+	return ac.inner.Deadline()
+}
+
+func (ac *AppContext) Done() <-chan struct{} {
+	return ac.inner.Done()
+}
+
+func (ac *AppContext) Err() error {
+	return ac.inner.Err()
+}
+
+func (ac *AppContext) Value(key any) any {
+	return ac.inner.Value(key)
+}
+
+func (ac *AppContext) Set(key, value any) {
+	ac.inner = context.WithValue(ac.inner, key, value)
+}
+
+func (ac *AppContext) Cancel() {
+	ac.cancelled = true
+	ac.cancelFunc()
+}
+
+func (ac *AppContext) RequestURI() string {
+	if ac.GinContext != nil && ac.GinContext.Request != nil {
+		return ac.GinContext.Request.Method + " :: " + ac.GinContext.Request.RequestURI
+	} else {
+		return ""
+	}
+}

ginext/commonHandler.go

@@ -0,0 +1,23 @@
+package ginext
+
+import (
+	"net/http"
+)
+
+func RedirectFound(newuri string) WHandlerFunc {
+	return func(pctx PreContext) HTTPResponse {
+		return Redirect(http.StatusFound, newuri)
+	}
+}
+
+func RedirectTemporary(newuri string) WHandlerFunc {
+	return func(pctx PreContext) HTTPResponse {
+		return Redirect(http.StatusTemporaryRedirect, newuri)
+	}
+}
+
+func RedirectPermanent(newuri string) WHandlerFunc {
+	return func(pctx PreContext) HTTPResponse {
+		return Redirect(http.StatusPermanentRedirect, newuri)
+	}
+}

ginext/commonMiddlewares.go

@@ -0,0 +1,12 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/dataext"
+)
+
+func BodyBuffer(g *gin.Context) {
+	if g.Request.Body != nil {
+		g.Request.Body = dataext.NewBufferedReadCloser(g.Request.Body)
+	}
+}

ginext/cors.go

@@ -0,0 +1,25 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"strings"
+)
+
+func CorsMiddleware(allowheader []string, exposeheader []string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
+		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
+		c.Writer.Header().Set("Access-Control-Allow-Headers", strings.Join(allowheader, ", "))
+		if len(exposeheader) > 0 {
+			c.Writer.Header().Set("Access-Control-Expose-Headers", strings.Join(exposeheader, ", "))
+		}
+		c.Writer.Header().Set("Access-Control-Allow-Methods", "OPTIONS, GET, POST, PUT, PATCH, DELETE, COUNT")
+
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(http.StatusOK)
+		} else {
+			c.Next()
+		}
+	}
+}

ginext/engine.go

@@ -0,0 +1,238 @@
+package ginext
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog/log"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/mathext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/rext"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"regexp"
+	"strings"
+	"time"
+)
+
+type GinWrapper struct {
+	engine          *gin.Engine
+	suppressGinLogs bool
+
+	opt                   Options
+	allowCors             bool
+	corsAllowHeader       []string
+	corsExposeHeader      []string
+	ginDebug              bool
+	bufferBody            bool
+	requestTimeout        time.Duration
+	listenerBeforeRequest []func(g *gin.Context)
+	listenerAfterRequest  []func(g *gin.Context, resp HTTPResponse)
+
+	buildRequestBindError func(g *gin.Context, fieldtype string, err error) HTTPResponse
+
+	routeSpecs []ginRouteSpec
+}
+
+type ginRouteSpec struct {
+	Method      string
+	URL         string
+	Middlewares []string
+	Handler     string
+}
+
+type Options struct {
+	AllowCors                *bool                                                          // Add cors handler to allow all CORS requests on the default http methods
+	CorsAllowHeader          *[]string                                                      // override the default values of Access-Control-Allow-Headers (AllowCors must be true)
+	CorsExposeHeader         *[]string                                                      // return Access-Control-Expose-Headers (AllowCors must be true)
+	GinDebug                 *bool                                                          // Set gin.debug to true (adds more logs)
+	SuppressGinLogs          *bool                                                          // Suppress our custom gin logs (even if GinDebug == true)
+	BufferBody               *bool                                                          // Buffers the input body stream, this way the ginext error handler can later include the whole request body
+	Timeout                  *time.Duration                                                 // The default handler timeout
+	ListenerBeforeRequest    []func(g *gin.Context)                                         // Register listener that are called before the handler method
+	ListenerAfterRequest     []func(g *gin.Context, resp HTTPResponse)                      // Register listener that are called after the handler method
+	DebugTrimHandlerPrefixes []string                                                       // Trim these prefixes from the handler names in the debug print
+	DebugReplaceHandlerNames map[string]string                                              // Replace handler names in debug output
+	BuildRequestBindError    func(g *gin.Context, fieldtype string, err error) HTTPResponse // Override function which generates the HTTPResponse errors that are returned by the preContext..Start() methids
+}
+
+// NewEngine creates a new (wrapped) ginEngine
+func NewEngine(opt Options) *GinWrapper {
+	ginDebug := langext.Coalesce(opt.GinDebug, true)
+	if ginDebug {
+		gin.SetMode(gin.DebugMode)
+
+		// do not debug-print routes
+		gin.DebugPrintRouteFunc = func(_, _, _ string, _ int) {}
+
+	} else {
+		gin.SetMode(gin.ReleaseMode)
+
+		// do not debug-print routes
+		gin.DebugPrintRouteFunc = func(_, _, _ string, _ int) {}
+	}
+
+	engine := gin.New()
+
+	wrapper := &GinWrapper{
+		engine:                engine,
+		opt:                   opt,
+		suppressGinLogs:       langext.Coalesce(opt.SuppressGinLogs, false),
+		allowCors:             langext.Coalesce(opt.AllowCors, false),
+		corsAllowHeader:       langext.Coalesce(opt.CorsAllowHeader, []string{"Content-Type", "Content-Length", "Accept-Encoding", "X-CSRF-Token", "Authorization", "accept", "origin", "Cache-Control", "X-Requested-With"}),
+		corsExposeHeader:      langext.Coalesce(opt.CorsExposeHeader, []string{}),
+		ginDebug:              ginDebug,
+		bufferBody:            langext.Coalesce(opt.BufferBody, false),
+		requestTimeout:        langext.Coalesce(opt.Timeout, 24*time.Hour),
+		listenerBeforeRequest: opt.ListenerBeforeRequest,
+		listenerAfterRequest:  opt.ListenerAfterRequest,
+		buildRequestBindError: langext.Conditional(opt.BuildRequestBindError == nil, defaultBuildRequestBindError, opt.BuildRequestBindError),
+	}
+
+	engine.RedirectFixedPath = false
+	engine.RedirectTrailingSlash = false
+
+	if wrapper.allowCors {
+		engine.Use(CorsMiddleware(wrapper.corsAllowHeader, wrapper.corsExposeHeader))
+	}
+
+	if ginDebug && !wrapper.suppressGinLogs {
+		ginlogger := gin.Logger()
+		engine.Use(func(context *gin.Context) { ginlogger(context) })
+	}
+	return wrapper
+}
+
+func (w *GinWrapper) ListenAndServeHTTP(addr string, postInit func(port string)) (chan error, *http.Server) {
+
+	w.DebugPrintRoutes()
+
+	httpserver := &http.Server{
+		Addr:    addr,
+		Handler: w.engine,
+	}
+
+	errChan := make(chan error)
+
+	go func() {
+
+		ln, err := net.Listen("tcp", httpserver.Addr)
+		if err != nil {
+			errChan <- err
+			return
+		}
+
+		_, port, err := net.SplitHostPort(ln.Addr().String())
+		if err != nil {
+			errChan <- err
+			return
+		}
+
+		log.Info().Str("address", httpserver.Addr).Msg("HTTP-Server started on http://localhost:" + port)
+
+		if postInit != nil {
+			postInit(port) // the net.Listener a few lines above is at this point actually already buffering requests
+		}
+
+		errChan <- httpserver.Serve(ln)
+	}()
+
+	return errChan, httpserver
+}
+
+func (w *GinWrapper) DebugPrintRoutes() {
+	if !w.ginDebug {
+		return
+	}
+
+	lines := make([][4]string, 0)
+
+	pad := [4]int{0, 0, 0, 0}
+
+	for _, spec := range w.routeSpecs {
+
+		line := [4]string{
+			spec.Method,
+			spec.URL,
+			strings.Join(langext.ArrMap(spec.Middlewares, w.cleanMiddlewareName), " -> "),
+			w.cleanMiddlewareName(spec.Handler),
+		}
+
+		lines = append(lines, line)
+
+		pad[0] = mathext.Max(pad[0], len(line[0]))
+		pad[1] = mathext.Max(pad[1], len(line[1]))
+		pad[2] = mathext.Max(pad[2], len(line[2]))
+		pad[3] = mathext.Max(pad[3], len(line[3]))
+	}
+
+	fmt.Printf("Gin-Routes:\n")
+	fmt.Printf("{\n")
+	for _, line := range lines {
+
+		fmt.Printf(" %s  %s  -->  %s  -->  %s\n",
+			langext.StrPadRight("["+line[0]+"]", " ", pad[0]+2),
+			langext.StrPadRight(line[1], " ", pad[1]),
+			langext.StrPadRight(line[2], " ", pad[2]),
+			langext.StrPadRight(line[3], " ", pad[3]))
+	}
+	fmt.Printf("}\n")
+}
+
+func (w *GinWrapper) cleanMiddlewareName(fname string) string {
+
+	funcSuffix := rext.W(regexp.MustCompile(`\.func[0-9]+(?:\.[0-9]+)*$`))
+	if match, ok := funcSuffix.MatchFirst(fname); ok {
+		fname = fname[:len(fname)-match.FullMatch().Length()]
+	}
+
+	if strings.HasSuffix(fname, ".(*GinRoutesWrapper).WithJSONFilter") {
+		fname = "[JSONFilter]"
+	}
+
+	if fname == "ginext.BodyBuffer" {
+		fname = "[BodyBuffer]"
+	}
+
+	skipPrefixes := []string{"api.(*Handler).", "api.", "ginext.", "handler.", "admin-app.", "employee-app.", "employer-app."}
+	for _, pfx := range skipPrefixes {
+		if strings.HasPrefix(fname, pfx) {
+			fname = fname[len(pfx):]
+		}
+	}
+
+	for _, pfx := range w.opt.DebugTrimHandlerPrefixes {
+		if strings.HasPrefix(fname, pfx) {
+			fname = fname[len(pfx):]
+		}
+	}
+
+	for k, v := range langext.ForceMap(w.opt.DebugReplaceHandlerNames) {
+		if strings.EqualFold(fname, k) {
+			fname = v
+		}
+	}
+
+	return fname
+}
+
+// ServeHTTP only used for unit tests
+func (w *GinWrapper) ServeHTTP(req *http.Request) *httptest.ResponseRecorder {
+	respRec := httptest.NewRecorder()
+	w.engine.ServeHTTP(respRec, req)
+	return respRec
+}
+
+// ForwardRequest manually inserts a request into this router
+// = behaves as if the request came from the outside (and writes the response to `writer`)
+func (w *GinWrapper) ForwardRequest(writer http.ResponseWriter, req *http.Request) {
+	w.engine.ServeHTTP(writer, req)
+}
+
+func (w *GinWrapper) ListRoutes() []gin.RouteInfo {
+	return w.engine.Routes()
+}
+
+func defaultBuildRequestBindError(g *gin.Context, fieldtype string, err error) HTTPResponse {
+	return Error(err)
+}

ginext/funcWrapper.go

@@ -0,0 +1,120 @@
+package ginext
+
+import (
+	"fmt"
+	"net/http"
+
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+	"github.com/gin-gonic/gin"
+)
+
+type WHandlerFunc func(PreContext) HTTPResponse
+
+func Wrap(w *GinWrapper, fn WHandlerFunc) gin.HandlerFunc {
+
+	return func(g *gin.Context) {
+
+		reqctx := g.Request.Context()
+
+		pctx := PreContext{
+			wrapper:        w,
+			ginCtx:         g,
+			persistantData: &preContextData{},
+		}
+
+		for _, lstr := range w.listenerBeforeRequest {
+			lstr(g)
+		}
+
+		wrap, stackTrace, panicObj := callPanicSafe(fn, pctx)
+		if panicObj != nil {
+
+			fmt.Printf("\n======== ======== STACKTRACE ======== ========\n%s\n======== ======== ======== ========\n\n", stackTrace)
+
+			err := exerr.
+				New(exerr.TypePanic, "Panic occured (in gin handler)").
+				Any("panicObj", panicObj).
+				Str("trace", stackTrace).
+				Build()
+
+			wrap = Error(err)
+		}
+
+		if g.Writer.Written() {
+			// (!) This panic is not preoperly cached - it will kill the whole process
+			//     but that only means you should NOT write in WrapperFunc...
+			panic("Writing in WrapperFunc is not supported")
+		}
+
+		if pctx.persistantData.sessionObj != nil {
+			err := pctx.persistantData.sessionObj.Finish(reqctx, wrap)
+			if err != nil {
+				wrap = Error(exerr.Wrap(err, "Failed to finish session").Any("originalResponse", wrap).Build())
+			}
+		}
+
+		for _, lstr := range w.listenerAfterRequest {
+			lstr(g, wrap)
+		}
+
+		if g.IsAborted() {
+			return
+		}
+
+		if reqctx.Err() == nil {
+			wrap.Write(g)
+			if g.IsAborted() {
+				// can happen if we try to marshal an invalid json object (e.g. containing Inf)
+				exerr.
+					New(exerr.TypePanic, "Failed to write response to renderer").
+					Strs("errors", g.Errors.Errors()).
+					Stack().
+					Print(g)
+
+				g.Status(500)
+			}
+		}
+	}
+}
+
+func WrapHTTPHandler(w *GinWrapper, fn http.Handler) gin.HandlerFunc {
+	return func(g *gin.Context) {
+		for _, lstr := range w.listenerBeforeRequest {
+			lstr(g)
+		}
+
+		fn.ServeHTTP(g.Writer, g.Request)
+
+		for _, lstr := range w.listenerAfterRequest {
+			lstr(g, nil)
+		}
+	}
+}
+
+func WrapHTTPHandlerFunc(w *GinWrapper, fn http.HandlerFunc) gin.HandlerFunc {
+	return func(g *gin.Context) {
+		for _, lstr := range w.listenerBeforeRequest {
+			lstr(g)
+		}
+
+		fn(g.Writer, g.Request)
+
+		for _, lstr := range w.listenerAfterRequest {
+			lstr(g, nil)
+		}
+	}
+}
+
+func WrapExtHTTPHandlerFunc(w *GinWrapper, fn func(*gin.Context, http.ResponseWriter, *http.Request)) gin.HandlerFunc {
+	return func(g *gin.Context) {
+		for _, lstr := range w.listenerBeforeRequest {
+			lstr(g)
+		}
+
+		fn(g, g.Writer, g.Request)
+
+		for _, lstr := range w.listenerAfterRequest {
+			lstr(g, nil)
+		}
+	}
+}

ginext/jsonFilter.go

@@ -0,0 +1,9 @@
+package ginext
+
+import "github.com/gin-gonic/gin"
+
+var jsonFilterKey = "goext.jsonfilter"
+
+func SetJSONFilter(g *gin.Context, filter string) {
+	g.Set(jsonFilterKey, filter)
+}

ginext/preContext.go

@@ -0,0 +1,211 @@
+package ginext
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/gin-gonic/gin/binding"
+	"git.blackforestbytes.com/BlackForestBytes/goext/dataext"
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"io"
+	"runtime/debug"
+	"time"
+)
+
+type PreContext struct {
+	ginCtx                 *gin.Context
+	wrapper                *GinWrapper
+	uri                    any
+	query                  any
+	body                   any
+	rawbody                *[]byte
+	form                   any
+	header                 any
+	timeout                *time.Duration
+	persistantData         *preContextData // must be a ptr, so that we can get the values back in out Wrap func
+	ignoreWrongContentType bool
+}
+
+type preContextData struct {
+	sessionObj SessionObject
+}
+
+func (pctx *PreContext) URI(uri any) *PreContext {
+	pctx.uri = uri
+	return pctx
+}
+
+func (pctx *PreContext) Query(query any) *PreContext {
+	pctx.query = query
+	return pctx
+}
+
+func (pctx *PreContext) Body(body any) *PreContext {
+	pctx.body = body
+	return pctx
+}
+
+func (pctx *PreContext) RawBody(rawbody *[]byte) *PreContext {
+	pctx.rawbody = rawbody
+	return pctx
+}
+
+func (pctx *PreContext) Form(form any) *PreContext {
+	pctx.form = form
+	return pctx
+}
+
+func (pctx *PreContext) Header(header any) *PreContext {
+	pctx.header = header
+	return pctx
+}
+
+func (pctx *PreContext) WithTimeout(to time.Duration) *PreContext {
+	pctx.timeout = &to
+	return pctx
+}
+
+func (pctx *PreContext) WithSession(sessionObj SessionObject) *PreContext {
+	pctx.persistantData.sessionObj = sessionObj
+	return pctx
+}
+
+func (pctx *PreContext) IgnoreWrongContentType() *PreContext {
+	pctx.ignoreWrongContentType = true
+	return pctx
+}
+
+func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
+	if pctx.uri != nil {
+		if err := pctx.ginCtx.ShouldBindUri(pctx.uri); err != nil {
+			err = exerr.Wrap(err, "Failed to read uri").
+				WithType(exerr.TypeBindFailURI).
+				Str("struct_type", fmt.Sprintf("%T", pctx.uri)).
+				Build()
+			return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "URI", err))
+		}
+	}
+
+	if pctx.query != nil {
+		if err := pctx.ginCtx.ShouldBindQuery(pctx.query); err != nil {
+			err = exerr.Wrap(err, "Failed to read query").
+				WithType(exerr.TypeBindFailQuery).
+				Str("struct_type", fmt.Sprintf("%T", pctx.query)).
+				Build()
+			return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "QUERY", err))
+		}
+	}
+
+	if pctx.body != nil {
+		if pctx.ginCtx.ContentType() == "application/json" {
+			if brc, ok := pctx.body.(dataext.BufferedReadCloser); ok {
+				// Ensures a fully reset (offset=0) buffer before parsing
+				err := brc.Reset()
+				if err != nil {
+					err = exerr.Wrap(err, "Failed to read (brc.reset) json-body").
+						WithType(exerr.TypeBindFailJSON).
+						Str("struct_type", fmt.Sprintf("%T", pctx.body)).
+						Build()
+					return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "JSON", err))
+				}
+			}
+			if err := pctx.ginCtx.ShouldBindJSON(pctx.body); err != nil {
+				err = exerr.Wrap(err, "Failed to read json-body").
+					WithType(exerr.TypeBindFailJSON).
+					Str("struct_type", fmt.Sprintf("%T", pctx.body)).
+					Build()
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "JSON", err))
+			}
+		} else {
+			if !pctx.ignoreWrongContentType {
+				err := exerr.New(exerr.TypeBindFailJSON, "missing JSON body").
+					Str("struct_type", fmt.Sprintf("%T", pctx.body)).
+					Build()
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "JSON", err))
+			}
+		}
+	}
+
+	if pctx.rawbody != nil {
+		if brc, ok := pctx.ginCtx.Request.Body.(dataext.BufferedReadCloser); ok {
+			v, err := brc.BufferedAll()
+			if err != nil {
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "BODY", err))
+			}
+			*pctx.rawbody = v
+		} else {
+			buf := &bytes.Buffer{}
+			_, err := io.Copy(buf, pctx.ginCtx.Request.Body)
+			if err != nil {
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "BODY", err))
+			}
+			*pctx.rawbody = buf.Bytes()
+		}
+	}
+
+	if pctx.form != nil {
+		if pctx.ginCtx.ContentType() == "multipart/form-data" {
+			if err := pctx.ginCtx.ShouldBindWith(pctx.form, binding.Form); err != nil {
+				err = exerr.Wrap(err, "Failed to read multipart-form").
+					WithType(exerr.TypeBindFailFormData).
+					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
+					Build()
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "FORM", err))
+			}
+		} else if pctx.ginCtx.ContentType() == "application/x-www-form-urlencoded" {
+			if err := pctx.ginCtx.ShouldBindWith(pctx.form, binding.Form); err != nil {
+				err = exerr.Wrap(err, "Failed to read urlencoded-form").
+					WithType(exerr.TypeBindFailFormData).
+					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
+					Build()
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "FORM", err))
+			}
+		} else {
+			if !pctx.ignoreWrongContentType {
+				err := exerr.New(exerr.TypeBindFailFormData, "missing form body").
+					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
+					Build()
+				return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "FORM", err))
+			}
+		}
+	}
+
+	if pctx.header != nil {
+		if err := pctx.ginCtx.ShouldBindHeader(pctx.header); err != nil {
+			err = exerr.Wrap(err, "Failed to read header").
+				WithType(exerr.TypeBindFailHeader).
+				Str("struct_type", fmt.Sprintf("%T", pctx.query)).
+				Build()
+			return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "HEADER", err))
+		}
+	}
+
+	ictx, cancel := context.WithTimeout(context.Background(), langext.Coalesce(pctx.timeout, pctx.wrapper.requestTimeout))
+
+	actx := CreateAppContext(pctx.ginCtx, ictx, cancel)
+
+	if pctx.persistantData.sessionObj != nil {
+		err := pctx.persistantData.sessionObj.Init(pctx.ginCtx, actx)
+		if err != nil {
+			actx.Cancel()
+			return CreateBackgroundAppContext(), nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "INIT", err))
+		}
+	}
+
+	return actx, pctx.ginCtx, nil
+}
+
+func callPanicSafe(fn WHandlerFunc, pctx PreContext) (res HTTPResponse, stackTrace string, panicObj any) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			res = nil
+			stackTrace = string(debug.Stack())
+			panicObj = rec
+		}
+	}()
+
+	res = fn(pctx)
+	return res, "", nil
+}

ginext/response.go

@@ -0,0 +1,47 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+)
+
+type cookieval struct {
+	name     string
+	value    string
+	maxAge   int
+	path     string
+	domain   string
+	secure   bool
+	httpOnly bool
+}
+
+type headerval struct {
+	Key string
+	Val string
+}
+
+type HTTPResponse interface {
+	Write(g *gin.Context)
+	WithHeader(k string, v string) HTTPResponse
+	WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse
+	IsSuccess() bool
+}
+
+type InspectableHTTPResponse interface {
+	HTTPResponse
+
+	Statuscode() int
+	BodyString(g *gin.Context) *string
+	ContentType() string
+	Headers() []string
+}
+
+type HTTPErrorResponse interface {
+	HTTPResponse
+
+	Error() error
+}
+
+func NotImplemented() HTTPResponse {
+	return Error(exerr.New(exerr.TypeNotImplemented, "").Build())
+}

ginext/responseData.go

@@ -0,0 +1,58 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type dataHTTPResponse struct {
+	statusCode  int
+	data        []byte
+	contentType string
+	headers     []headerval
+	cookies     []cookieval
+}
+
+func (j dataHTTPResponse) Write(g *gin.Context) {
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+	g.Data(j.statusCode, j.contentType, j.data)
+}
+
+func (j dataHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j dataHTTPResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j dataHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j dataHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j dataHTTPResponse) BodyString(*gin.Context) *string {
+	return langext.Ptr(string(j.data))
+}
+
+func (j dataHTTPResponse) ContentType() string {
+	return j.contentType
+}
+
+func (j dataHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func Data(sc int, contentType string, data []byte) HTTPResponse {
+	return &dataHTTPResponse{statusCode: sc, contentType: contentType, data: data}
+}

ginext/responseDownload.go

@@ -0,0 +1,64 @@
+package ginext
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type downloadDataHTTPResponse struct {
+	statusCode int
+	mimetype   string
+	data       []byte
+	filename   *string
+	headers    []headerval
+	cookies    []cookieval
+}
+
+func (j downloadDataHTTPResponse) Write(g *gin.Context) {
+	g.Header("Content-Type", j.mimetype) // if we don't set it here gin does weird file-sniffing later...
+	if j.filename != nil {
+		g.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", *j.filename))
+	}
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+	g.Data(j.statusCode, j.mimetype, j.data)
+}
+
+func (j downloadDataHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j downloadDataHTTPResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j downloadDataHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j downloadDataHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j downloadDataHTTPResponse) BodyString(*gin.Context) *string {
+	return langext.Ptr(string(j.data))
+}
+
+func (j downloadDataHTTPResponse) ContentType() string {
+	return j.mimetype
+}
+
+func (j downloadDataHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func DownloadData(status int, mimetype string, filename string, data []byte) HTTPResponse {
+	return &downloadDataHTTPResponse{statusCode: status, mimetype: mimetype, data: data, filename: &filename}
+}

ginext/responseEmpty.go

@@ -0,0 +1,56 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type emptyHTTPResponse struct {
+	statusCode int
+	headers    []headerval
+	cookies    []cookieval
+}
+
+func (j emptyHTTPResponse) Write(g *gin.Context) {
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+	g.Status(j.statusCode)
+}
+
+func (j emptyHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j emptyHTTPResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j emptyHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j emptyHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j emptyHTTPResponse) BodyString(*gin.Context) *string {
+	return nil
+}
+
+func (j emptyHTTPResponse) ContentType() string {
+	return ""
+}
+
+func (j emptyHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func Status(sc int) HTTPResponse {
+	return &emptyHTTPResponse{statusCode: sc}
+}

ginext/responseFile.go

@@ -0,0 +1,73 @@
+package ginext
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+	"os"
+)
+
+type fileHTTPResponse struct {
+	mimetype string
+	filepath string
+	filename *string
+	headers  []headerval
+	cookies  []cookieval
+}
+
+func (j fileHTTPResponse) Write(g *gin.Context) {
+	g.Header("Content-Type", j.mimetype) // if we don't set it here gin does weird file-sniffing later...
+	if j.filename != nil {
+		g.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", *j.filename))
+
+	}
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+	g.File(j.filepath)
+}
+
+func (j fileHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j fileHTTPResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j fileHTTPResponse) IsSuccess() bool {
+	return true
+}
+
+func (j fileHTTPResponse) Statuscode() int {
+	return 200
+}
+
+func (j fileHTTPResponse) BodyString(*gin.Context) *string {
+	data, err := os.ReadFile(j.filepath)
+	if err != nil {
+		return nil
+	}
+	return langext.Ptr(string(data))
+}
+
+func (j fileHTTPResponse) ContentType() string {
+	return j.mimetype
+}
+
+func (j fileHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func File(mimetype string, filepath string) HTTPResponse {
+	return &fileHTTPResponse{mimetype: mimetype, filepath: filepath}
+}
+
+func Download(mimetype string, filepath string, filename string) HTTPResponse {
+	return &fileHTTPResponse{mimetype: mimetype, filepath: filepath, filename: &filename}
+}

ginext/responseJson.go

@@ -0,0 +1,78 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	json "git.blackforestbytes.com/BlackForestBytes/goext/gojson"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type jsonHTTPResponse struct {
+	statusCode     int
+	data           any
+	headers        []headerval
+	cookies        []cookieval
+	filterOverride *string
+}
+
+func (j jsonHTTPResponse) jsonRenderer(g *gin.Context) json.GoJsonRender {
+	var f *string
+	if jsonfilter := g.GetString(jsonFilterKey); jsonfilter != "" {
+		f = &jsonfilter
+	}
+	if j.filterOverride != nil {
+		f = j.filterOverride
+	}
+	return json.GoJsonRender{Data: j.data, NilSafeSlices: true, NilSafeMaps: true, Filter: f}
+}
+
+func (j jsonHTTPResponse) Write(g *gin.Context) {
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+	g.Render(j.statusCode, j.jsonRenderer(g))
+}
+
+func (j jsonHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j jsonHTTPResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j jsonHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j jsonHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j jsonHTTPResponse) BodyString(g *gin.Context) *string {
+	if str, err := j.jsonRenderer(g).RenderString(); err == nil {
+		return &str
+	} else {
+		return nil
+	}
+}
+
+func (j jsonHTTPResponse) ContentType() string {
+	return "application/json"
+}
+
+func (j jsonHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func JSON(sc int, data any) HTTPResponse {
+	return &jsonHTTPResponse{statusCode: sc, data: data}
+}
+
+func JSONWithFilter(sc int, data any, f string) HTTPResponse {
+	return &jsonHTTPResponse{statusCode: sc, data: data, filterOverride: &f}
+}

ginext/responseJsonAPI.go

@@ -0,0 +1,81 @@
+package ginext
+
+import (
+	"context"
+	"github.com/gin-gonic/gin"
+	"git.blackforestbytes.com/BlackForestBytes/goext/exerr"
+	"git.blackforestbytes.com/BlackForestBytes/goext/langext"
+)
+
+type jsonAPIErrResponse struct {
+	err     *exerr.ExErr
+	headers []headerval
+	cookies []cookieval
+}
+
+func (j jsonAPIErrResponse) Error() error {
+	return j.err
+}
+
+func (j jsonAPIErrResponse) Write(g *gin.Context) {
+	for _, v := range j.headers {
+		g.Header(v.Key, v.Val)
+	}
+	for _, v := range j.cookies {
+		g.SetCookie(v.name, v.value, v.maxAge, v.path, v.domain, v.secure, v.httpOnly)
+	}
+
+	exerr.Get(j.err).Output(context.Background(), g)
+
+	j.err.CallListener(exerr.MethodOutput, exerr.ListenerOpt{NoLog: false})
+}
+
+func (j jsonAPIErrResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j jsonAPIErrResponse) WithCookie(name string, value string, maxAge int, path string, domain string, secure bool, httpOnly bool) HTTPResponse {
+	j.cookies = append(j.cookies, cookieval{name, value, maxAge, path, domain, secure, httpOnly})
+	return j
+}
+
+func (j jsonAPIErrResponse) IsSuccess() bool {
+	return false
+}
+
+func (j jsonAPIErrResponse) Statuscode() int {
+	return langext.Coalesce(j.err.RecursiveStatuscode(), 0)
+}
+
+func (j jsonAPIErrResponse) BodyString(*gin.Context) *string {
+	if str, err := j.err.ToDefaultAPIJson(); err == nil {
+		return &str
+	} else {
+		return nil
+	}
+}
+
+func (j jsonAPIErrResponse) ContentType() string {
+	return "application/json"
+}
+
+func (j jsonAPIErrResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func (j jsonAPIErrResponse) Unwrap() error {
+	return j.err
+}
+
+func Error(e error) HTTPResponse {
+	return &jsonAPIErrResponse{
+		err: exerr.FromError(e),
+	}
+}
+
+func ErrWrap(e error, errorType exerr.ErrorType, msg string) HTTPResponse {
+	return &jsonAPIErrResponse{
+		err: exerr.FromError(exerr.Wrap(e, msg).WithType(errorType).Build()),
+	}
+}