v0.0.558 update gojson (rebase onto go1.23.4)

.gitea/workflows/tests.yml

@@ -6,7 +6,12 @@
 name: Build Docker and Deploy
 run-name: Build & Deploy ${{ gitea.ref }} on ${{ gitea.actor }}
 
-on: [push]
+on:
+  push:
+    branches:
+      - '*'
+      - '**'
+
 
 jobs:
   run_tests:
@@ -34,3 +39,17 @@ jobs:
       - name: Run tests
         run: cd "${{ gitea.workspace }}" && make test
 
+      - name: Send failure mail
+        if: failure()
+        uses: dawidd6/action-send-mail@v3
+        with:
+          server_address: smtp.fastmail.com
+          server_port: 465
+          secure: true
+          username: ${{secrets.MAIL_USERNAME}}
+          password: ${{secrets.MAIL_PASSWORD}}
+          subject: Pipeline on '${{ gitea.repository }}' failed
+          to: ${{ steps.commiter_info.outputs.MAIL }}
+          from: Gitea Actions <gitea_actions@blackforestbytes.de>
+          body: "Go to https://gogs.blackforestbytes.com/${{ gitea.repository }}/actions"
+

.idea/.gitignore

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

.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>

README.md

@@ -8,7 +8,7 @@ This should not have any heavy dependencies (gin, mongo, etc) and add missing ba
 Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
 
 
-### Packages:
+## Packages:
 
 | Name        | Maintainer | Description                                                                                                   |
 |-------------|------------|---------------------------------------------------------------------------------------------------------------|
@@ -20,8 +20,9 @@ Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
 | 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                                                                          |
+| mongoext    | Mike       | Utility/Helper functions for mongodb (kinda abandoned)                                                        |
 | cursortoken | Mike       | MongoDB cursortoken implementation                                                                            |
 | pagination  | Mike       | Pagination implementation                                                                                     |
 |             |            |                                                                                                               |
@@ -30,7 +31,7 @@ Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
 | confext     | Mike       | Parses environment configuration into structs                                                                 |
 | cmdext      | Mike       | Runner for external commands/processes                                                                        |
 |             |            |                                                                                                               |
-| sq          | Mike       | Utility functions for sql based databases                                                                     |
+| 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                         |
@@ -40,4 +41,71 @@ Potentially needs `export GOPRIVATE="gogs.mikescher.com"`
 |             |            |                                                                                                               |
 | 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

@@ -2,6 +2,8 @@
 
  - cronext
 
- - rfctime.DateOnly
  - rfctime.HMSTimeOnly
- - rfctime.NanoTimeOnly
+ - rfctime.NanoTimeOnly
+
+ - remove sqlx dependency from sq  (unmaintained, and mostly superseeded by our own stuff?)
+ - Move DBLogger and DBPreprocessor to sq

bfcodegen/csid-generate.go

@@ -26,6 +26,10 @@ type CSIDDef struct {
 	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})].*$`))
@@ -35,7 +39,9 @@ var rexCSIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumCharsetIDGen
 //go:embed csid-generate.template
 var templateCSIDGenerateText string
 
-func GenerateCharsetIDSpecs(sourceDir string, destFile string) error {
+func GenerateCharsetIDSpecs(sourceDir string, destFile string, opt CSIDGenOptions) error {
+
+	debugOutput := langext.Coalesce(opt.DebugOutput, false)
 
 	files, err := os.ReadDir(sourceDir)
 	if err != nil {
@@ -70,9 +76,9 @@ func GenerateCharsetIDSpecs(sourceDir string, destFile string) error {
 	newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
 
 	if newChecksum != oldChecksum {
-		fmt.Printf("[IDGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
+		fmt.Printf("[CSIDGenerate] 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)
+		fmt.Printf("[CSIDGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
 		return nil
 	}
 
@@ -81,13 +87,18 @@ func GenerateCharsetIDSpecs(sourceDir string, destFile string) error {
 	pkgname := ""
 
 	for _, f := range files {
-		fmt.Printf("========= %s =========\n\n", f.Name())
-		fileIDs, pn, err := processCSIDFile(sourceDir, path.Join(sourceDir, f.Name()))
+		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
 		}
 
-		fmt.Printf("\n")
+		if debugOutput {
+			fmt.Printf("\n")
+		}
 
 		allIDs = append(allIDs, fileIDs...)
 
@@ -113,7 +124,7 @@ func GenerateCharsetIDSpecs(sourceDir string, destFile string) error {
 	return nil
 }
 
-func processCSIDFile(basedir string, fn string) ([]CSIDDef, string, error) {
+func processCSIDFile(basedir string, fn string, debugOutput bool) ([]CSIDDef, string, error) {
 	file, err := os.Open(fn)
 	if err != nil {
 		return nil, "", err
@@ -155,7 +166,11 @@ func processCSIDFile(basedir string, fn string) ([]CSIDDef, string, error) {
 				Name:         match.GroupByName("name").Value(),
 				Prefix:       match.GroupByName("prefix").Value(),
 			}
-			fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+
+			if debugOutput {
+				fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+			}
+
 			ids = append(ids, def)
 		}
 	}

bfcodegen/csid-generate_test.go

@@ -12,8 +12,8 @@ import (
 	"time"
 )
 
-//go:embed _test_example.tgz
-var CSIDExampleModels []byte
+//go:embed _test_example_1.tgz
+var CSIDExampleModels1 []byte
 
 func TestGenerateCSIDSpecs(t *testing.T) {
 
@@ -21,7 +21,7 @@ func TestGenerateCSIDSpecs(t *testing.T) {
 
 	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
 
-	err := os.WriteFile(tmpFile, CSIDExampleModels, 0o777)
+	err := os.WriteFile(tmpFile, CSIDExampleModels1, 0o777)
 	tst.AssertNoErr(t, err)
 
 	t.Cleanup(func() { _ = os.Remove(tmpFile) })
@@ -34,10 +34,10 @@ func TestGenerateCSIDSpecs(t *testing.T) {
 	_, 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")
+	err = GenerateCharsetIDSpecs(tmpDir, tmpDir+"/csid_gen.go", CSIDGenOptions{DebugOutput: langext.PTrue})
 	tst.AssertNoErr(t, err)
 
-	err = GenerateCharsetIDSpecs(tmpDir, tmpDir+"/csid_gen.go")
+	err = GenerateCharsetIDSpecs(tmpDir, tmpDir+"/csid_gen.go", CSIDGenOptions{DebugOutput: langext.PTrue})
 	tst.AssertNoErr(t, err)
 
 	fmt.Println()

bfcodegen/enum-generate.go

@@ -3,6 +3,7 @@ package bfcodegen
 import (
 	"bytes"
 	_ "embed"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"go/format"
@@ -14,6 +15,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"reflect"
 	"regexp"
 	"strings"
 	"text/template"
@@ -23,6 +25,8 @@ type EnumDefVal struct {
 	VarName     string
 	Value       string
 	Description *string
+	Data        *map[string]any
+	RawComment  *string
 }
 
 type EnumDef struct {
@@ -33,23 +37,23 @@ type EnumDef struct {
 	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<descr>.*))?.*$`))
+var rexEnumValueDef = rext.W(regexp.MustCompile(`^\s*(?P<name>[A-Za-z0-9_]+)\s+(?P<type>[A-Za-z0-9_]+)\s*=\s*(?P<value>("[A-Za-z0-9_:\s\-.]*"|[0-9]+))\s*(//(?P<comm>.*))?.*$`))
 
 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) error {
-
-	files, err := os.ReadDir(sourceDir)
-	if err != nil {
-		return err
-	}
+func GenerateEnumSpecs(sourceDir string, destFile string, opt EnumGenOptions) error {
 
 	oldChecksum := "N/A"
 	if _, err := os.Stat(destFile); !os.IsNotExist(err) {
@@ -62,6 +66,30 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 		}
 	}
 
+	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") })
@@ -71,7 +99,7 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 	for _, f := range files {
 		content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
 		if err != nil {
-			return err
+			return "", "", false, err
 		}
 		newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
 	}
@@ -82,7 +110,7 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 		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 nil
+		return "", oldChecksum, false, nil
 	}
 
 	allEnums := make([]EnumDef, 0)
@@ -90,13 +118,18 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 	pkgname := ""
 
 	for _, f := range files {
-		fmt.Printf("========= %s =========\n\n", f.Name())
-		fileEnums, pn, err := processEnumFile(sourceDir, path.Join(sourceDir, f.Name()))
-		if err != nil {
-			return err
+		if debugOutput {
+			fmt.Printf("========= %s =========\n\n", f.Name())
 		}
 
-		fmt.Printf("\n")
+		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...)
 
@@ -106,23 +139,24 @@ func GenerateEnumSpecs(sourceDir string, destFile string) error {
 	}
 
 	if pkgname == "" {
-		return errors.New("no package name found in any file")
+		return "", "", false, errors.New("no package name found in any file")
 	}
 
-	fdata, err := format.Source([]byte(fmtEnumOutput(newChecksum, allEnums, pkgname)))
+	rdata := fmtEnumOutput(newChecksum, allEnums, pkgname)
+
+	if !gofmt {
+		return rdata, newChecksum, true, nil
+	}
+
+	fdata, err := format.Source([]byte(rdata))
 	if err != nil {
-		return err
+		return "", "", false, err
 	}
 
-	err = os.WriteFile(destFile, fdata, 0o755)
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return string(fdata), newChecksum, true, nil
 }
 
-func processEnumFile(basedir string, fn string) ([]EnumDef, string, error) {
+func processEnumFile(basedir string, fn string, debugOutput bool) ([]EnumDef, string, error) {
 	file, err := os.Open(fn)
 	if err != nil {
 		return nil, "", err
@@ -166,15 +200,42 @@ func processEnumFile(basedir string, fn string) ([]EnumDef, string, error) {
 				Values:       make([]EnumDefVal, 0),
 			}
 			enums = append(enums, def)
-			fmt.Printf("Found enum definition { '%s' -> '%s' }\n", def.EnumTypeName, def.Type)
+
+			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(),
-				Description: match.GroupByNameOrEmpty("descr").ValueOrNil(),
+				RawComment:  comment,
+				Description: descr,
+				Data:        data,
 			}
 
 			found := false
@@ -182,16 +243,21 @@ func processEnumFile(basedir string, fn string) ([]EnumDef, string, error) {
 				if v.EnumTypeName == typename {
 					enums[i].Values = append(enums[i].Values, def)
 					found = true
-					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)
+
+					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 {
-				fmt.Printf("Found non-enum value [%s] for '%s' ( looks like enum value, but no matching @enum:type )\n", def.Value, def.VarName)
+				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)
+				}
 			}
 		}
 	}
@@ -199,6 +265,41 @@ func processEnumFile(basedir string, fn string) ([]EnumDef, string, error) {
 	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")
@@ -211,6 +312,47 @@ func fmtEnumOutput(cs string, enums []EnumDef, pkgname string) 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))

bfcodegen/enum-generate.template

@@ -7,25 +7,44 @@ import "gogs.mikescher.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}}", {{end}}
+	{{.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}}
 
@@ -64,6 +83,15 @@ func (e {{.EnumTypeName}}) Description() string {
 }
 {{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
@@ -71,10 +99,24 @@ func (e {{.EnumTypeName}}) VarName() string {
 	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}}
+
 func Parse{{.EnumTypeName}}(vv string) ({{.EnumTypeName}}, bool) {
 	for _, ev := range __{{.EnumTypeName}}Values {
 		if string(ev) == vv {
@@ -94,4 +136,20 @@ func {{.EnumTypeName}}ValuesMeta() []enums.EnumMetaValue {
 	}
 }
 
-{{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

@@ -12,8 +12,11 @@ import (
 	"time"
 )
 
-//go:embed _test_example.tgz
-var EnumExampleModels []byte
+//go:embed _test_example_1.tgz
+var EnumExampleModels1 []byte
+
+//go:embed _test_example_2.tgz
+var EnumExampleModels2 []byte
 
 func TestGenerateEnumSpecs(t *testing.T) {
 
@@ -21,7 +24,7 @@ func TestGenerateEnumSpecs(t *testing.T) {
 
 	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
 
-	err := os.WriteFile(tmpFile, EnumExampleModels, 0o777)
+	err := os.WriteFile(tmpFile, EnumExampleModels1, 0o777)
 	tst.AssertNoErr(t, err)
 
 	t.Cleanup(func() { _ = os.Remove(tmpFile) })
@@ -34,17 +37,53 @@ func TestGenerateEnumSpecs(t *testing.T) {
 	_, err = cmdext.Runner("tar").Arg("-xvzf").Arg(tmpFile).Arg("-C").Arg(tmpDir).FailOnExitCode().FailOnTimeout().Timeout(time.Minute).Run()
 	tst.AssertNoErr(t, err)
 
-	err = GenerateEnumSpecs(tmpDir, tmpDir+"/enums_gen.go")
+	s1, cs1, _, err := _generateEnumSpecs(tmpDir, "", "N/A", true, true)
 	tst.AssertNoErr(t, err)
 
-	err = GenerateEnumSpecs(tmpDir, tmpDir+"/enums_gen.go")
+	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(string(tst.Must(os.ReadFile(tmpDir + "/enums_gen.go"))(t)))
+	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()

bfcodegen/id-generate.go

@@ -25,6 +25,10 @@ type IDDef struct {
 	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).*$`))
@@ -34,7 +38,9 @@ var rexIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumIDGenerator =
 //go:embed id-generate.template
 var templateIDGenerateText string
 
-func GenerateIDSpecs(sourceDir string, destFile string) error {
+func GenerateIDSpecs(sourceDir string, destFile string, opt IDGenOptions) error {
+
+	debugOutput := langext.Coalesce(opt.DebugOutput, false)
 
 	files, err := os.ReadDir(sourceDir)
 	if err != nil {
@@ -80,13 +86,18 @@ func GenerateIDSpecs(sourceDir string, destFile string) error {
 	pkgname := ""
 
 	for _, f := range files {
-		fmt.Printf("========= %s =========\n\n", f.Name())
-		fileIDs, pn, err := processIDFile(sourceDir, path.Join(sourceDir, f.Name()))
+		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
 		}
 
-		fmt.Printf("\n")
+		if debugOutput {
+			fmt.Printf("\n")
+		}
 
 		allIDs = append(allIDs, fileIDs...)
 
@@ -112,7 +123,7 @@ func GenerateIDSpecs(sourceDir string, destFile string) error {
 	return nil
 }
 
-func processIDFile(basedir string, fn string) ([]IDDef, string, error) {
+func processIDFile(basedir string, fn string, debugOutput bool) ([]IDDef, string, error) {
 	file, err := os.Open(fn)
 	if err != nil {
 		return nil, "", err
@@ -153,7 +164,11 @@ func processIDFile(basedir string, fn string) ([]IDDef, string, error) {
 				FileRelative: rfp,
 				Name:         match.GroupByName("name").Value(),
 			}
-			fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+
+			if debugOutput {
+				fmt.Printf("Found ID definition { '%s' }\n", def.Name)
+			}
+
 			ids = append(ids, def)
 		}
 	}

bfcodegen/id-generate_test.go

@@ -12,8 +12,8 @@ import (
 	"time"
 )
 
-//go:embed _test_example.tgz
-var IDExampleModels []byte
+//go:embed _test_example_1.tgz
+var IDExampleModels1 []byte
 
 func TestGenerateIDSpecs(t *testing.T) {
 
@@ -21,7 +21,7 @@ func TestGenerateIDSpecs(t *testing.T) {
 
 	tmpDir := filepath.Join(t.TempDir(), langext.MustHexUUID())
 
-	err := os.WriteFile(tmpFile, IDExampleModels, 0o777)
+	err := os.WriteFile(tmpFile, IDExampleModels1, 0o777)
 	tst.AssertNoErr(t, err)
 
 	t.Cleanup(func() { _ = os.Remove(tmpFile) })
@@ -34,10 +34,10 @@ func TestGenerateIDSpecs(t *testing.T) {
 	_, 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")
+	err = GenerateIDSpecs(tmpDir, tmpDir+"/id_gen.go", IDGenOptions{DebugOutput: langext.PTrue})
 	tst.AssertNoErr(t, err)
 
-	err = GenerateIDSpecs(tmpDir, tmpDir+"/id_gen.go")
+	err = GenerateIDSpecs(tmpDir, tmpDir+"/id_gen.go", IDGenOptions{DebugOutput: langext.PTrue})
 	tst.AssertNoErr(t, err)
 
 	fmt.Println()

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

@@ -6,3 +6,13 @@ 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

@@ -1,14 +1,15 @@
 package cursortoken
 
 import (
+	"context"
 	"go.mongodb.org/mongo-driver/mongo"
 )
 
 type RawFilter interface {
-	FilterQuery() mongo.Pipeline
+	FilterQuery(ctx context.Context) mongo.Pipeline
 }
 
 type Filter interface {
-	FilterQuery() mongo.Pipeline
-	Pagination() (string, SortDirection, string, SortDirection)
+	FilterQuery(ctx context.Context) mongo.Pipeline
+	Pagination(ctx context.Context) (string, SortDirection, string, SortDirection)
 }

cursortoken/token.go

@@ -3,12 +3,18 @@ package cursortoken
 import (
 	"encoding/base32"
 	"encoding/json"
-	"errors"
-	"go.mongodb.org/mongo-driver/bson/primitive"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"strconv"
 	"strings"
 	"time"
 )
 
+type CursorToken interface {
+	Token() string
+	IsStart() bool
+	IsEnd() bool
+}
+
 type Mode string
 
 const (
@@ -24,97 +30,6 @@ type Extra struct {
 	PageSize  *int
 }
 
-type CursorToken struct {
-	Mode               Mode
-	ValuePrimary       string
-	ValueSecondary     string
-	Direction          SortDirection
-	DirectionSecondary SortDirection
-	PageSize           int
-	Extra              Extra
-}
-
-type cursorTokenSerialize 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 Start() CursorToken {
-	return CursorToken{
-		Mode:               CTMStart,
-		ValuePrimary:       "",
-		ValueSecondary:     "",
-		Direction:          "",
-		DirectionSecondary: "",
-		PageSize:           0,
-		Extra:              Extra{},
-	}
-}
-
-func End() CursorToken {
-	return CursorToken{
-		Mode:               CTMEnd,
-		ValuePrimary:       "",
-		ValueSecondary:     "",
-		Direction:          "",
-		DirectionSecondary: "",
-		PageSize:           0,
-		Extra:              Extra{},
-	}
-}
-
-func (c *CursorToken) 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 := cursorTokenSerialize{}
-
-	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 Decode(tok string) (CursorToken, error) {
 	if tok == "" {
 		return Start(), nil
@@ -125,60 +40,56 @@ func Decode(tok string) (CursorToken, error) {
 	if strings.ToLower(tok) == "@end" {
 		return End(), nil
 	}
-
-	if !strings.HasPrefix(tok, "tok_") {
-		return CursorToken{}, errors.New("could not decode token, missing prefix")
+	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
 	}
 
-	body, err := base32.StdEncoding.DecodeString(tok[len("tok_"):])
-	if err != nil {
-		return CursorToken{}, err
-	}
+	if strings.HasPrefix(tok, "tok_") {
 
-	var tokenDeserialize cursorTokenSerialize
-	err = json.Unmarshal(body, &tokenDeserialize)
-	if err != nil {
-		return CursorToken{}, err
-	}
+		body, err := base32.StdEncoding.DecodeString(tok[len("tok_"):])
+		if err != nil {
+			return nil, err
+		}
 
-	token := CursorToken{Mode: CTMNormal}
+		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()
+		}
 
-	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 := CTKeySort{Mode: CTMNormal}
 
-	token.Extra.Timestamp = tokenDeserialize.ExtraTimestamp
-	token.Extra.Id = tokenDeserialize.ExtraId
-	token.Extra.Page = tokenDeserialize.ExtraPage
-	token.Extra.PageSize = tokenDeserialize.ExtraPageSize
+		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
+		}
 
-	return token, nil
-}
+		token.Extra.Timestamp = tokenDeserialize.ExtraTimestamp
+		token.Extra.Id = tokenDeserialize.ExtraId
+		token.Extra.Page = tokenDeserialize.ExtraPage
+		token.Extra.PageSize = tokenDeserialize.ExtraPageSize
+
+		return token, nil
 
-func (c *CursorToken) ValuePrimaryObjectId() (primitive.ObjectID, bool) {
-	if oid, err := primitive.ObjectIDFromHex(c.ValuePrimary); err == nil {
-		return oid, true
 	} else {
-		return primitive.ObjectID{}, false
-	}
-}
-
-func (c *CursorToken) ValueSecondaryObjectId() (primitive.ObjectID, bool) {
-	if oid, err := primitive.ObjectIDFromHex(c.ValueSecondary); err == nil {
-		return oid, true
-	} else {
-		return primitive.ObjectID{}, false
+		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/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/optional.go

@@ -0,0 +1,83 @@
+package dataext
+
+import (
+	"encoding/json"
+	"errors"
+	"gogs.mikescher.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/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/syncMap.go

@@ -0,0 +1,167 @@
+package dataext
+
+import "sync"
+
+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{}}
+}
+
+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
+}
+
+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
+}
+
+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
+}
+
+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
+	}
+}
+
+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
+	}
+}
+
+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
+	}
+}
+
+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
+}
+
+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
+}
+
+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
+}
+
+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
+}

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

@@ -7,8 +7,12 @@ 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
+// 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()
@@ -19,9 +23,12 @@ func (s *SyncSet[TData]) Add(value TData) bool {
 	}
 
 	_, existsInPreState := s.data[value]
-	s.data[value] = true
+	if existsInPreState {
+		return false
+	}
 
-	return !existsInPreState
+	s.data[value] = true
+	return true
 }
 
 func (s *SyncSet[TData]) AddAll(values []TData) {
@@ -37,6 +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()
@@ -66,3 +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

@@ -19,6 +19,14 @@ 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 {
@@ -34,6 +42,14 @@ 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 {
@@ -50,6 +66,14 @@ 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 {
@@ -67,6 +91,14 @@ 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 {
@@ -86,6 +118,14 @@ func (t Quintuple[T1, T2, T3, T4, T5]) TupleValues() []any {
 
 }
 
+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 {
@@ -106,6 +146,14 @@ func (t Sextuple[T1, T2, T3, T4, T5, T6]) TupleValues() []any {
 
 }
 
+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 {
@@ -126,6 +174,14 @@ 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 {
@@ -147,6 +203,14 @@ 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 {
@@ -168,3 +232,10 @@ func (t Nonuple[T1, T2, T3, T4, T5, T6, T7, T8, T9]) TupleLength() int {
 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

@@ -5,6 +5,8 @@ type Enum interface {
 	ValuesAny() []any
 	ValuesMeta() []EnumMetaValue
 	VarName() string
+	TypeName() string
+	PackageName() string
 }
 
 type StringEnum interface {
@@ -15,10 +17,17 @@ type StringEnum interface {
 type DescriptionEnum interface {
 	Enum
 	Description() string
+	DescriptionMeta() EnumDescriptionMetaValue
 }
 
 type EnumMetaValue struct {
 	VarName     string  `json:"varName"`
-	Value       any     `json:"value"`
+	Value       Enum    `json:"value"`
 	Description *string `json:"description"`
 }
+
+type EnumDescriptionMetaValue struct {
+	VarName     string `json:"varName"`
+	Value       Enum   `json:"value"`
+	Description string `json:"description"`
+}

exerr/builder.go

@@ -30,6 +30,10 @@ import (
 // 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(..)`
@@ -55,21 +59,12 @@ import (
 //     => Wrap/New + Fatal
 //
 
-var stackSkipLogger zerolog.Logger
-
-func init() {
-	cw := zerolog.ConsoleWriter{
-		Out:        os.Stdout,
-		TimeFormat: "2006-01-02 15:04:05 Z07:00",
-	}
-
-	multi := zerolog.MultiLevelWriter(cw)
-	stackSkipLogger = zerolog.New(multi).With().Timestamp().CallerWithSkipFrameCount(4).Logger()
-}
-
 type Builder struct {
-	errorData       *ExErr
-	containsGinData bool
+	wrappedErr          error
+	errorData           *ExErr
+	containsGinData     bool
+	containsContextData bool
+	noLog               bool
 }
 
 func Get(err error) *Builder {
@@ -85,12 +80,14 @@ func Wrap(err error, msg string) *Builder {
 		return &Builder{errorData: newExErr(CatSystem, TypeInternal, msg)} // prevent NPE if we call Wrap with err==nil
 	}
 
+	v := FromError(err)
+
 	if !pkgconfig.RecursiveErrors {
-		v := FromError(err)
 		v.Message = msg
-		return &Builder{errorData: v}
+		return &Builder{wrappedErr: err, errorData: v}
+	} else {
+		return &Builder{wrappedErr: err, errorData: wrapExErr(v, msg, CatWrap, 1)}
 	}
-	return &Builder{errorData: wrapExErr(FromError(err), msg, CatWrap, 1)}
 }
 
 // ----------------------------------------------------------------------------
@@ -190,6 +187,13 @@ func (b *Builder) System() *Builder {
 
 // ----------------------------------------------------------------------------
 
+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))
 }
@@ -300,27 +304,27 @@ func (b *Builder) Errs(key string, val []error) *Builder {
 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.Time("ctx_startTimestamp", t)
+			b.Time("ctx_endTimestamp", time.Now())
 		}
 	}
-	b.Str("gin.method", req.Method)
-	b.Str("gin.path", g.FullPath())
-	b.Strs("gin.header", extractHeader(g.Request.Header))
+	b.Str("gin_method", req.Method)
+	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())
+		b.Str("gin_url", req.URL.String())
 	}
 	if ctxVal := g.GetString("apiversion"); ctxVal != "" {
-		b.Str("gin.context.apiversion", ctxVal)
+		b.Str("gin_context_apiversion", ctxVal)
 	}
 	if ctxVal := g.GetString("uid"); ctxVal != "" {
-		b.Str("gin.context.uid", ctxVal)
+		b.Str("gin_context_uid", ctxVal)
 	}
 	if ctxVal := g.GetString("fcmId"); ctxVal != "" {
-		b.Str("gin.context.fcmid", ctxVal)
+		b.Str("gin_context_fcmid", ctxVal)
 	}
 	if ctxVal := g.GetString("reqid"); ctxVal != "" {
-		b.Str("gin.context.reqid", ctxVal)
+		b.Str("gin_context_reqid", ctxVal)
 	}
 	if req.Method != "GET" && req.Body != nil {
 
@@ -331,12 +335,12 @@ func (b *Builder) GinReq(ctx context.Context, g *gin.Context, req *http.Request)
 						var prettyJSON bytes.Buffer
 						err = json.Indent(&prettyJSON, bin, "", "  ")
 						if err == nil {
-							b.Str("gin.body", string(prettyJSON.Bytes()))
+							b.Str("gin_body", string(prettyJSON.Bytes()))
 						} else {
-							b.Bytes("gin.body", bin)
+							b.Bytes("gin_body", bin)
 						}
 					} else {
-						b.Str("gin.body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
+						b.Str("gin_body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
 					}
 				}
 			}
@@ -346,9 +350,9 @@ func (b *Builder) GinReq(ctx context.Context, g *gin.Context, req *http.Request)
 			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)
+						b.Bytes("gin_body", bin)
 					} else {
-						b.Str("gin.body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
+						b.Str("gin_body", fmt.Sprintf("[[%v bytes | %s]]", len(bin), req.Header.Get("Content-Type")))
 					}
 				}
 			}
@@ -356,31 +360,18 @@ func (b *Builder) GinReq(ctx context.Context, g *gin.Context, req *http.Request)
 
 	}
 
+	pkgconfig.ExtendGinMeta(ctx, b, g, req)
+
 	b.containsGinData = true
 	return b
 }
 
-func formatHeader(header map[string][]string) string {
-	ml := 1
-	for k, _ := range header {
-		if len(k) > ml {
-			ml = len(k)
-		}
-	}
-	r := ""
-	for k, v := range header {
-		if r != "" {
-			r += "\n"
-		}
-		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 += langext.StrPadRight(k, " ", ml) + " := " + value
-		}
-	}
-	return r
+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 {
@@ -399,18 +390,38 @@ func extractHeader(header map[string][]string) []string {
 
 // ----------------------------------------------------------------------------
 
+// 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
-func (b *Builder) Build() error {
+// Can be gloablly configured with ZeroLogErrTraces and ZeroLogAllTraces
+// Can be locally suppressed with Builder.NoLog()
+func (b *Builder) Build(ctxs ...context.Context) error {
 	warnOnPkgConfigNotInitialized()
 
-	if pkgconfig.ZeroLogErrTraces && (b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal) {
-		b.errorData.ShortLog(stackSkipLogger.Error())
-	} else if pkgconfig.ZeroLogAllTraces {
-		b.errorData.ShortLog(stackSkipLogger.Error())
+	for _, dctx := range ctxs {
+		b.CtxData(MethodBuild, dctx)
 	}
 
-	b.CallListener(MethodBuild)
+	if pkgconfig.DisableErrorWrapping && b.wrappedErr != nil {
+		return b.wrappedErr
+	}
+
+	if pkgconfig.ZeroLogErrTraces && !b.noLog && (b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal) {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Error())
+	} else if pkgconfig.ZeroLogAllTraces && !b.noLog {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Error())
+	}
+
+	b.errorData.CallListener(MethodBuild)
 
 	return b.errorData
 }
@@ -424,27 +435,41 @@ func (b *Builder) Output(ctx context.Context, g *gin.Context) {
 		b.GinReq(ctx, g, g.Request)
 	}
 
+	b.CtxData(MethodOutput, ctx)
+
 	b.errorData.Output(g)
 
-	if b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal {
-		b.errorData.Log(stackSkipLogger.Error())
-	} else if b.errorData.Severity == SevWarn {
-		b.errorData.Log(stackSkipLogger.Warn())
+	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.CallListener(MethodOutput)
+	b.errorData.CallListener(MethodOutput)
 }
 
 // Print prints the error
 // If the error is SevErr we also send it to the error-service
-func (b *Builder) Print() {
-	if b.errorData.Severity == SevErr || b.errorData.Severity == SevFatal {
-		b.errorData.Log(stackSkipLogger.Error())
-	} else if b.errorData.Severity == SevWarn {
-		b.errorData.ShortLog(stackSkipLogger.Warn())
+func (b *Builder) Print(ctxs ...context.Context) Proxy {
+	warnOnPkgConfigNotInitialized()
+
+	for _, dctx := range ctxs {
+		b.CtxData(MethodPrint, dctx)
 	}
 
-	b.CallListener(MethodPrint)
+	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 {
+		b.errorData.ShortLog(pkgconfig.ZeroLogger.Debug())
+	}
+
+	b.errorData.CallListener(MethodPrint)
+
+	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 {
@@ -453,11 +478,17 @@ func (b *Builder) Format(level LogPrintLevel) string {
 
 // 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() {
-	b.errorData.Severity = SevFatal
-	b.errorData.Log(stackSkipLogger.WithLevel(zerolog.FatalLevel))
+func (b *Builder) Fatal(ctxs ...context.Context) {
 
-	b.CallListener(MethodFatal)
+	b.errorData.Severity = SevFatal
+
+	for _, dctx := range ctxs {
+		b.CtxData(MethodFatal, dctx)
+	}
+
+	b.errorData.Log(pkgconfig.ZeroLogger.WithLevel(zerolog.FatalLevel))
+
+	b.errorData.CallListener(MethodFatal)
 
 	os.Exit(1)
 }

exerr/constructor.go

@@ -12,11 +12,78 @@ import (
 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(),
@@ -31,6 +98,7 @@ func FromError(err error) *ExErr {
 		Caller:         "",
 		OriginalError:  nil,
 		Meta:           getForeignMeta(err),
+		Extra:          make(map[string]any),
 	}
 }
 
@@ -48,6 +116,7 @@ func newExErr(cat ErrorCategory, errtype ErrorType, msg string) *ExErr {
 		Caller:         callername(2),
 		OriginalError:  nil,
 		Meta:           make(map[string]MetaValue),
+		Extra:          make(map[string]any),
 	}
 }
 
@@ -56,7 +125,7 @@ func wrapExErr(e *ExErr, msg string, cat ErrorCategory, stacktraceskip int) *ExE
 		UniqueID:       newID(),
 		Category:       cat,
 		Type:           TypeWrap,
-		Severity:       SevErr,
+		Severity:       e.Severity,
 		Timestamp:      time.Now(),
 		StatusCode:     e.StatusCode,
 		Message:        msg,
@@ -65,6 +134,7 @@ func wrapExErr(e *ExErr, msg string, cat ErrorCategory, stacktraceskip int) *ExE
 		Caller:         callername(1 + stacktraceskip),
 		OriginalError:  e,
 		Meta:           make(map[string]MetaValue),
+		Extra:          langext.CopyMap(langext.ForceMap(e.Extra)),
 	}
 }
 
@@ -181,7 +251,7 @@ func getReflectedMetaValues(value interface{}, remainingDepth int) map[string]Me
 
 	jsonval, err := json.Marshal(value)
 	if err != nil {
-		panic(err) // gets recovered later up
+		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)}}

exerr/data.go

@@ -1,81 +1,14 @@
 package exerr
 
-import (
-	"gogs.mikescher.com/BlackForestBytes/goext/dataext"
-	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+type Method string
+
+const (
+	MethodOutput Method = "OUTPUT"
+	MethodPrint  Method = "PRINT"
+	MethodBuild  Method = "BUILD"
+	MethodFatal  Method = "FATAL"
 )
 
-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
-)
-
-//goland:noinspection GoUnusedGlobalVariable
-var AllCategories = []ErrorCategory{CatWrap, CatSystem, CatUser, CatForeign}
-
-type ErrorSeverity struct{ Severity string }
-
-var (
-	SevTrace = ErrorSeverity{"Trace"}
-	SevDebug = ErrorSeverity{"Debug"}
-	SevInfo  = ErrorSeverity{"Info"}
-	SevWarn  = ErrorSeverity{"Warn"}
-	SevErr   = ErrorSeverity{"Err"}
-	SevFatal = ErrorSeverity{"Fatal"}
-)
-
-//goland:noinspection GoUnusedGlobalVariable
-var AllSeverities = []ErrorSeverity{SevTrace, SevDebug, SevInfo, SevWarn, SevErr, SevFatal}
-
-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))
-
-	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))
-
-	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))
-
-	TypeUnauthorized = NewType("UNAUTHORIZED", langext.Ptr(401))
-	TypeAuthFailed   = NewType("AUTH_FAILED", langext.Ptr(401))
-
-	// other values come the used package
-)
-
-var registeredTypes = dataext.SyncSet[string]{}
-
-func NewType(key string, defStatusCode *int) ErrorType {
-	insertOkay := registeredTypes.Add(key)
-	if !insertOkay {
-		panic("Cannot register same ErrType ('" + key + "') more than once")
-	}
-
-	return ErrorType{key, defStatusCode}
-}
-
 type LogPrintLevel string
 
 const (

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 +1,156 @@
+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"
+	"gogs.mikescher.com/BlackForestBytes/goext/dataext"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"reflect"
+)
+
+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))
+
+	// 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"
+	"gogs.mikescher.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

@@ -1,18 +1,29 @@
 package exerr
 
 import (
+	"context"
 	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"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
+	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 {
@@ -23,6 +34,12 @@ type ErrorPackageConfigInit struct {
 	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
@@ -35,6 +52,11 @@ var pkgconfig = ErrorPackageConfig{
 	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
@@ -47,6 +69,8 @@ func Init(cfg ErrorPackageConfigInit) {
 
 	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
@@ -54,6 +78,19 @@ func Init(cfg ErrorPackageConfigInit) {
 	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),
@@ -63,11 +100,32 @@ func Init(cfg ErrorPackageConfigInit) {
 		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(4).Logger()
+}
+
+func Initialized() bool {
+	return initialized
+}
+
 func warnOnPkgConfigNotInitialized() {
 	if !initialized {
 		fmt.Printf("\n")

exerr/exerr.go

@@ -1,6 +1,7 @@
 package exerr
 
 import (
+	"fmt"
 	"github.com/rs/xid"
 	"github.com/rs/zerolog"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
@@ -26,7 +27,8 @@ type ExErr struct {
 
 	OriginalError *ExErr `json:"originalError"`
 
-	Meta MetaMap `json:"meta"`
+	Extra map[string]any `json:"extra"`
+	Meta  MetaMap        `json:"meta"`
 }
 
 func (ee *ExErr) Error() string {
@@ -36,6 +38,13 @@ func (ee *ExErr) Error() string {
 // 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
@@ -81,9 +90,29 @@ func (ee *ExErr) Log(evt *zerolog.Event) {
 }
 
 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", " ") + ")"
 		}
@@ -98,6 +127,10 @@ func (ee *ExErr) FormatLog(lvl LogPrintLevel) string {
 
 		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 += "  "
@@ -119,12 +152,16 @@ func (ee *ExErr) FormatLog(lvl LogPrintLevel) string {
 
 		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 := ee.Type.Key
-			if ee.Type == TypeWrap {
+			etype := curr.Type.Key
+			if curr.Type == TypeWrap {
 				etype = "~"
 			}
 
@@ -168,15 +205,33 @@ func (ee *ExErr) ShortLog(evt *zerolog.Event) {
 }
 
 // RecursiveMessage returns the message to show
-// = first error (top-down) that is not wrapping/foreign/empty
+// = 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 != CatWrap && curr.Category != CatForeign {
+		if curr.Message != "" && curr.Category != CatForeign {
 			return curr.Message
 		}
 	}
 
-	// fallback to self
+	// ==== [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
 }
 
@@ -240,6 +295,89 @@ func (ee *ExErr) Depth() int {
 	}
 }
 
+// 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 := []string{ee.UniqueID}
+	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 {

exerr/exerr_test.go

@@ -2,10 +2,19 @@ package exerr
 
 import (
 	"errors"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"gogs.mikescher.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
 }

exerr/gin.go

@@ -15,10 +15,10 @@ func (ee *ExErr) toJson(depth int, applyExtendListener bool, outputMeta bool) la
 		ginJson["id"] = ee.UniqueID
 	}
 	if ee.Category != CatWrap {
-		ginJson["category"] = ee.Category
+		ginJson["category"] = ee.Category.Category
 	}
 	if ee.Type != TypeWrap {
-		ginJson["type"] = ee.Type
+		ginJson["type"] = ee.Type.Key
 	}
 	if ee.StatusCode != nil {
 		ginJson["statuscode"] = ee.StatusCode
@@ -30,7 +30,7 @@ func (ee *ExErr) toJson(depth int, applyExtendListener bool, outputMeta bool) la
 		ginJson["caller"] = ee.Caller
 	}
 	if ee.Severity != SevErr {
-		ginJson["severity"] = ee.Severity
+		ginJson["severity"] = ee.Severity.Severity
 	}
 	if ee.Timestamp != (time.Time{}) {
 		ginJson["time"] = ee.Timestamp.Format(time.RFC3339)
@@ -48,6 +48,12 @@ func (ee *ExErr) toJson(depth int, applyExtendListener bool, outputMeta bool) la
 			metaJson[metaKey] = metaVal.rawValueForJson()
 		}
 		ginJson["meta"] = metaJson
+
+		extraJson := langext.H{}
+		for extraKey, extraVal := range ee.Extra {
+			extraJson[extraKey] = extraVal
+		}
+		ginJson["extra"] = extraJson
 	}
 
 	if applyExtendListener {
@@ -57,6 +63,19 @@ func (ee *ExErr) toJson(depth int, applyExtendListener bool, outputMeta bool) la
 	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)
 //
@@ -77,6 +96,20 @@ func (ee *ExErr) ToAPIJson(applyExtendListener bool, includeWrappedErrors bool,
 		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)
 	}

exerr/helper.go

@@ -86,3 +86,41 @@ func MessageMatch(e error, matcher func(string) bool) bool {
 
 	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

@@ -4,15 +4,6 @@ import (
 	"sync"
 )
 
-type Method string
-
-const (
-	MethodOutput Method = "OUTPUT"
-	MethodPrint  Method = "PRINT"
-	MethodBuild  Method = "BUILD"
-	MethodFatal  Method = "FATAL"
-)
-
 type Listener = func(method Method, v *ExErr)
 
 var listenerLock = sync.Mutex{}
@@ -25,13 +16,11 @@ func RegisterListener(l Listener) {
 	listener = append(listener, l)
 }
 
-func (b *Builder) CallListener(m Method) {
-	valErr := b.errorData
-
+func (ee *ExErr) CallListener(m Method) {
 	listenerLock.Lock()
 	defer listenerLock.Unlock()
 
 	for _, v := range listener {
-		v(m, valErr)
+		v(m, ee)
 	}
 }

exerr/meta.go

@@ -9,6 +9,7 @@ import (
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -667,6 +668,28 @@ func (v MetaValue) rawValueForJson() any {
 		}
 		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
 }
 

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
+}

ginext/cors.go

@@ -3,13 +3,17 @@ package ginext
 import (
 	"github.com/gin-gonic/gin"
 	"net/http"
+	"strings"
 )
 
-func CorsMiddleware() gin.HandlerFunc {
+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", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
+		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" {

ginext/engine.go

@@ -6,20 +6,30 @@ import (
 	"github.com/rs/zerolog/log"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"gogs.mikescher.com/BlackForestBytes/goext/mathext"
+	"gogs.mikescher.com/BlackForestBytes/goext/rext"
 	"net"
 	"net/http"
+	"net/http/httptest"
+	"regexp"
 	"strings"
 	"time"
 )
 
 type GinWrapper struct {
 	engine          *gin.Engine
-	SuppressGinLogs bool
+	suppressGinLogs bool
 
-	allowCors      bool
-	ginDebug       bool
-	bufferBody     bool
-	requestTimeout time.Duration
+	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
 }
@@ -31,47 +41,65 @@ type ginRouteSpec struct {
 	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
-// Parameters are:
-// - [allowCors]    Add cors handler to allow all CORS requests on the default http methods
-// - [ginDebug]     Set gin.debug to true (adds more logs)
-// - [bufferBody]   Buffers the input body stream, this way the ginext error handler can later include the whole request body
-// - [timeout]      The default handler timeout
-func NewEngine(allowCors bool, ginDebug bool, bufferBody bool, timeout time.Duration) *GinWrapper {
+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,
-		SuppressGinLogs: false,
-		allowCors:       allowCors,
-		ginDebug:        ginDebug,
-		bufferBody:      bufferBody,
-		requestTimeout:  timeout,
+		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 allowCors {
-		engine.Use(CorsMiddleware())
+	if wrapper.allowCors {
+		engine.Use(CorsMiddleware(wrapper.corsAllowHeader, wrapper.corsExposeHeader))
 	}
 
-	// do not debug-print routes
-	gin.DebugPrintRouteFunc = func(_, _, _ string, _ int) {}
-
-	if !ginDebug {
-		gin.SetMode(gin.ReleaseMode)
-
+	if ginDebug && !wrapper.suppressGinLogs {
 		ginlogger := gin.Logger()
-		engine.Use(func(context *gin.Context) {
-			if !wrapper.SuppressGinLogs {
-				ginlogger(context)
-			}
-		})
-	} else {
-		gin.SetMode(gin.DebugMode)
+		engine.Use(func(context *gin.Context) { ginlogger(context) })
 	}
-
 	return wrapper
 }
 
@@ -126,8 +154,8 @@ func (w *GinWrapper) DebugPrintRoutes() {
 		line := [4]string{
 			spec.Method,
 			spec.URL,
-			strings.Join(spec.Middlewares, " -> "),
-			spec.Handler,
+			strings.Join(langext.ArrMap(spec.Middlewares, w.cleanMiddlewareName), " -> "),
+			w.cleanMiddlewareName(spec.Handler),
 		}
 
 		lines = append(lines, line)
@@ -138,12 +166,73 @@ func (w *GinWrapper) DebugPrintRoutes() {
 		pad[3] = mathext.Max(pad[3], len(line[3]))
 	}
 
+	fmt.Printf("Gin-Routes:\n")
+	fmt.Printf("{\n")
 	for _, line := range lines {
 
-		fmt.Printf("Gin-Route: %s  %s  -->  %s  -->  %s\n",
+		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

@@ -14,7 +14,17 @@ func Wrap(w *GinWrapper, fn WHandlerFunc) gin.HandlerFunc {
 
 		reqctx := g.Request.Context()
 
-		wrap, stackTrace, panicObj := callPanicSafe(fn, PreContext{wrapper: w, ginCtx: g})
+		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)
@@ -32,6 +42,17 @@ func Wrap(w *GinWrapper, fn WHandlerFunc) gin.HandlerFunc {
 			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 reqctx.Err() == nil {
 			wrap.Write(g)
 		}

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

@@ -15,15 +15,21 @@ import (
 )
 
 type PreContext struct {
-	ginCtx  *gin.Context
-	wrapper *GinWrapper
-	uri     any
-	query   any
-	body    any
-	rawbody *[]byte
-	form    any
-	header  any
-	timeout *time.Duration
+	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 {
@@ -61,6 +67,16 @@ func (pctx *PreContext) WithTimeout(to time.Duration) *PreContext {
 	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 {
@@ -68,7 +84,7 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 				WithType(exerr.TypeBindFailURI).
 				Str("struct_type", fmt.Sprintf("%T", pctx.uri)).
 				Build()
-			return nil, nil, langext.Ptr(Error(err))
+			return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "URI", err))
 		}
 	}
 
@@ -78,24 +94,37 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 				WithType(exerr.TypeBindFailQuery).
 				Str("struct_type", fmt.Sprintf("%T", pctx.query)).
 				Build()
-			return nil, nil, langext.Ptr(Error(err))
+			return nil, 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 nil, 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 nil, nil, langext.Ptr(Error(err))
+				return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "JSON", err))
 			}
 		} else {
-			err := exerr.New(exerr.TypeBindFailJSON, "missing JSON body").
-				Str("struct_type", fmt.Sprintf("%T", pctx.body)).
-				Build()
-			return nil, nil, langext.Ptr(Error(err))
+			if !pctx.ignoreWrongContentType {
+				err := exerr.New(exerr.TypeBindFailJSON, "missing JSON body").
+					Str("struct_type", fmt.Sprintf("%T", pctx.body)).
+					Build()
+				return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "JSON", err))
+			}
 		}
 	}
 
@@ -103,14 +132,14 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 		if brc, ok := pctx.ginCtx.Request.Body.(dataext.BufferedReadCloser); ok {
 			v, err := brc.BufferedAll()
 			if err != nil {
-				return nil, nil, langext.Ptr(Error(err))
+				return nil, 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 nil, nil, langext.Ptr(Error(err))
+				return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "BODY", err))
 			}
 			*pctx.rawbody = buf.Bytes()
 		}
@@ -123,7 +152,7 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 					WithType(exerr.TypeBindFailFormData).
 					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
 					Build()
-				return nil, nil, langext.Ptr(Error(err))
+				return nil, 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 {
@@ -131,13 +160,15 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 					WithType(exerr.TypeBindFailFormData).
 					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
 					Build()
-				return nil, nil, langext.Ptr(Error(err))
+				return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "FORM", err))
 			}
 		} else {
-			err := exerr.New(exerr.TypeBindFailFormData, "missing form body").
-				Str("struct_type", fmt.Sprintf("%T", pctx.form)).
-				Build()
-			return nil, nil, langext.Ptr(Error(err))
+			if !pctx.ignoreWrongContentType {
+				err := exerr.New(exerr.TypeBindFailFormData, "missing form body").
+					Str("struct_type", fmt.Sprintf("%T", pctx.form)).
+					Build()
+				return nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "FORM", err))
+			}
 		}
 	}
 
@@ -147,13 +178,22 @@ func (pctx PreContext) Start() (*AppContext, *gin.Context, *HTTPResponse) {
 				WithType(exerr.TypeBindFailHeader).
 				Str("struct_type", fmt.Sprintf("%T", pctx.query)).
 				Build()
-			return nil, nil, langext.Ptr(Error(err))
+			return nil, 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 nil, nil, langext.Ptr(pctx.wrapper.buildRequestBindError(pctx.ginCtx, "INIT", err))
+		}
+	}
+
 	return actx, pctx.ginCtx, nil
 }
 

ginext/response.go

@@ -1,12 +1,20 @@
 package ginext
 
 import (
-	"fmt"
 	"github.com/gin-gonic/gin"
 	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
-	json "gogs.mikescher.com/BlackForestBytes/goext/gojson"
 )
 
+type cookieval struct {
+	name     string
+	value    string
+	maxAge   int
+	path     string
+	domain   string
+	secure   bool
+	httpOnly bool
+}
+
 type headerval struct {
 	Key string
 	Val string
@@ -15,204 +23,23 @@ type headerval struct {
 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 jsonHTTPResponse struct {
-	statusCode int
-	data       any
-	headers    []headerval
+type InspectableHTTPResponse interface {
+	HTTPResponse
+
+	Statuscode() int
+	BodyString(g *gin.Context) *string
+	ContentType() string
+	Headers() []string
 }
 
-func (j jsonHTTPResponse) Write(g *gin.Context) {
-	for _, v := range j.headers {
-		g.Header(v.Key, v.Val)
-	}
-	var f *string
-	if jsonfilter := g.GetString("goext.jsonfilter"); jsonfilter != "" {
-		f = &jsonfilter
-	}
-	g.Render(j.statusCode, json.GoJsonRender{Data: j.data, NilSafeSlices: true, NilSafeMaps: true, Filter: f})
-}
+type HTTPErrorResponse interface {
+	HTTPResponse
 
-func (j jsonHTTPResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-type emptyHTTPResponse struct {
-	statusCode int
-	headers    []headerval
-}
-
-func (j emptyHTTPResponse) Write(g *gin.Context) {
-	for _, v := range j.headers {
-		g.Header(v.Key, v.Val)
-	}
-	g.Status(j.statusCode)
-}
-
-func (j emptyHTTPResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-type textHTTPResponse struct {
-	statusCode int
-	data       string
-	headers    []headerval
-}
-
-func (j textHTTPResponse) Write(g *gin.Context) {
-	for _, v := range j.headers {
-		g.Header(v.Key, v.Val)
-	}
-	g.String(j.statusCode, "%s", j.data)
-}
-
-func (j textHTTPResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-type dataHTTPResponse struct {
-	statusCode  int
-	data        []byte
-	contentType string
-	headers     []headerval
-}
-
-func (j dataHTTPResponse) Write(g *gin.Context) {
-	for _, v := range j.headers {
-		g.Header(v.Key, v.Val)
-	}
-	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
-}
-
-type fileHTTPResponse struct {
-	mimetype string
-	filepath string
-	filename *string
-	headers  []headerval
-}
-
-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)
-	}
-	g.File(j.filepath)
-}
-
-func (j fileHTTPResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-type downloadDataHTTPResponse struct {
-	statusCode int
-	mimetype   string
-	data       []byte
-	filename   *string
-	headers    []headerval
-}
-
-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)
-	}
-	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
-}
-
-type redirectHTTPResponse struct {
-	statusCode int
-	url        string
-	headers    []headerval
-}
-
-func (j redirectHTTPResponse) Write(g *gin.Context) {
-	g.Redirect(j.statusCode, j.url)
-}
-
-func (j redirectHTTPResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-type jsonAPIErrResponse struct {
-	err     *exerr.ExErr
-	headers []headerval
-}
-
-func (j jsonAPIErrResponse) Write(g *gin.Context) {
-	j.err.Output(g)
-}
-
-func (j jsonAPIErrResponse) WithHeader(k string, v string) HTTPResponse {
-	j.headers = append(j.headers, headerval{k, v})
-	return j
-}
-
-func Status(sc int) HTTPResponse {
-	return &emptyHTTPResponse{statusCode: sc}
-}
-
-func JSON(sc int, data any) HTTPResponse {
-	return &jsonHTTPResponse{statusCode: sc, data: data}
-}
-
-func Data(sc int, contentType string, data []byte) HTTPResponse {
-	return &dataHTTPResponse{statusCode: sc, contentType: contentType, data: data}
-}
-
-func Text(sc int, data string) HTTPResponse {
-	return &textHTTPResponse{statusCode: sc, data: data}
-}
-
-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}
-}
-
-func DownloadData(status int, mimetype string, filename string, data []byte) HTTPResponse {
-	return &downloadDataHTTPResponse{statusCode: status, mimetype: mimetype, data: data, filename: &filename}
-}
-
-func Redirect(sc int, newURL string) HTTPResponse {
-	return &redirectHTTPResponse{statusCode: sc, url: newURL}
-}
-
-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()),
-	}
+	Error() error
 }
 
 func NotImplemented() HTTPResponse {

ginext/responseData.go

@@ -0,0 +1,58 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"gogs.mikescher.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"
+	"gogs.mikescher.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"
+	"gogs.mikescher.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"
+	"gogs.mikescher.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 "gogs.mikescher.com/BlackForestBytes/goext/gojson"
+	"gogs.mikescher.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"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.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)
+}
+
+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()),
+	}
+}

ginext/responseRedirect.go

@@ -0,0 +1,57 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+)
+
+type redirectHTTPResponse struct {
+	statusCode int
+	url        string
+	headers    []headerval
+	cookies    []cookieval
+}
+
+func (j redirectHTTPResponse) 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.Redirect(j.statusCode, j.url)
+}
+
+func (j redirectHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j redirectHTTPResponse) 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 redirectHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j redirectHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j redirectHTTPResponse) BodyString(*gin.Context) *string {
+	return nil
+}
+
+func (j redirectHTTPResponse) ContentType() string {
+	return ""
+}
+
+func (j redirectHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func Redirect(sc int, newURL string) HTTPResponse {
+	return &redirectHTTPResponse{statusCode: sc, url: newURL}
+}

ginext/responseSeekable.go

@@ -0,0 +1,72 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"io"
+	"net/http"
+	"time"
+)
+
+type seekableResponse struct {
+	data        io.ReadSeeker
+	contentType string
+	filename    string
+	headers     []headerval
+	cookies     []cookieval
+}
+
+func (j seekableResponse) Write(g *gin.Context) {
+	g.Header("Content-Type", j.contentType) // if we don't set it here http.ServeContent does weird sniffing later...
+
+	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)
+	}
+
+	http.ServeContent(g.Writer, g.Request, j.filename, time.Unix(0, 0), j.data)
+
+	if clsr, ok := j.data.(io.ReadSeekCloser); ok {
+		err := clsr.Close()
+		if err != nil {
+			exerr.Wrap(err, "failed to close io.ReadSeerkClose in ginext.Seekable").Str("filename", j.filename).Print()
+		}
+	}
+}
+
+func (j seekableResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j seekableResponse) 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 seekableResponse) IsSuccess() bool {
+	return true
+}
+
+func (j seekableResponse) Statuscode() int {
+	return 200
+}
+
+func (j seekableResponse) BodyString(*gin.Context) *string {
+	return langext.Ptr("(seekable)")
+}
+
+func (j seekableResponse) ContentType() string {
+	return j.contentType
+}
+
+func (j seekableResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func Seekable(filename string, contentType string, data io.ReadSeeker) HTTPResponse {
+	return &seekableResponse{filename: filename, contentType: contentType, data: data}
+}

ginext/responseText.go

@@ -0,0 +1,57 @@
+package ginext
+
+import (
+	"github.com/gin-gonic/gin"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+)
+
+type textHTTPResponse struct {
+	statusCode int
+	data       string
+	headers    []headerval
+	cookies    []cookieval
+}
+
+func (j textHTTPResponse) 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.String(j.statusCode, "%s", j.data)
+}
+
+func (j textHTTPResponse) WithHeader(k string, v string) HTTPResponse {
+	j.headers = append(j.headers, headerval{k, v})
+	return j
+}
+
+func (j textHTTPResponse) 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 textHTTPResponse) IsSuccess() bool {
+	return j.statusCode >= 200 && j.statusCode <= 399
+}
+
+func (j textHTTPResponse) Statuscode() int {
+	return j.statusCode
+}
+
+func (j textHTTPResponse) BodyString(*gin.Context) *string {
+	return langext.Ptr(j.data)
+}
+
+func (j textHTTPResponse) ContentType() string {
+	return "text/plain"
+}
+
+func (j textHTTPResponse) Headers() []string {
+	return langext.ArrMap(j.headers, func(v headerval) string { return v.Key + "=" + v.Val })
+}
+
+func Text(sc int, data string) HTTPResponse {
+	return &textHTTPResponse{statusCode: sc, data: data}
+}

ginext/routes.go

@@ -3,11 +3,9 @@ package ginext
 import (
 	"github.com/gin-gonic/gin"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
-	"gogs.mikescher.com/BlackForestBytes/goext/rext"
 	"net/http"
 	"path"
 	"reflect"
-	"regexp"
 	"runtime"
 	"strings"
 )
@@ -55,15 +53,11 @@ func (w *GinRoutesWrapper) Group(relativePath string) *GinRoutesWrapper {
 func (w *GinRoutesWrapper) Use(middleware ...gin.HandlerFunc) *GinRoutesWrapper {
 	defHandler := langext.ArrCopy(w.defaultHandler)
 	defHandler = append(defHandler, middleware...)
-	return &GinRoutesWrapper{wrapper: w.wrapper, routes: w.routes, defaultHandler: defHandler}
+	return &GinRoutesWrapper{wrapper: w.wrapper, routes: w.routes, defaultHandler: defHandler, absPath: w.absPath}
 }
 
 func (w *GinRoutesWrapper) WithJSONFilter(filter string) *GinRoutesWrapper {
-	defHandler := langext.ArrCopy(w.defaultHandler)
-	defHandler = append(defHandler, func(g *gin.Context) {
-		g.Set("goext.jsonfilter", filter)
-	})
-	return &GinRoutesWrapper{wrapper: w.wrapper, routes: w.routes, defaultHandler: defHandler}
+	return w.Use(func(g *gin.Context) { g.Set(jsonFilterKey, filter) })
 }
 
 func (w *GinRoutesWrapper) GET(relativePath string) *GinRouteBuilder {
@@ -118,10 +112,7 @@ func (w *GinRouteBuilder) Use(middleware ...gin.HandlerFunc) *GinRouteBuilder {
 }
 
 func (w *GinRouteBuilder) WithJSONFilter(filter string) *GinRouteBuilder {
-	w.handlers = append(w.handlers, func(g *gin.Context) {
-		g.Set("goext.jsonfilter", filter)
-	})
-	return w
+	return w.Use(func(g *gin.Context) { g.Set(jsonFilterKey, filter) })
 }
 
 func (w *GinRouteBuilder) Handle(handler WHandlerFunc) {
@@ -196,12 +187,6 @@ func nameOfFunction(f any) string {
 		fname = fname[:len(fname)-len("-fm")]
 	}
 
-	suffix := rext.W(regexp.MustCompile(`\.func[0-9]+(?:\.[0-9]+)*$`))
-
-	if match, ok := suffix.MatchFirst(fname); ok {
-		fname = fname[:len(fname)-match.FullMatch().Length()]
-	}
-
 	return fname
 }
 

ginext/session.go

@@ -0,0 +1,11 @@
+package ginext
+
+import (
+	"context"
+	"github.com/gin-gonic/gin"
+)
+
+type SessionObject interface {
+	Init(g *gin.Context, ctx *AppContext) error
+	Finish(ctx context.Context, resp HTTPResponse) error
+}

go.mod

@@ -1,49 +1,64 @@
 module gogs.mikescher.com/BlackForestBytes/goext
 
-go 1.19
+go 1.23
 
 require (
-	github.com/gin-gonic/gin v1.9.1
-	github.com/jmoiron/sqlx v1.3.5
-	github.com/rs/xid v1.5.0
-	github.com/rs/zerolog v1.31.0
-	go.mongodb.org/mongo-driver v1.13.0
-	golang.org/x/crypto v0.15.0
-	golang.org/x/sys v0.14.0
-	golang.org/x/term v0.14.0
+	github.com/gin-gonic/gin v1.10.0
+	github.com/glebarez/go-sqlite v1.22.0 // only needed for tests -.-
+	github.com/jmoiron/sqlx v1.4.0
+	github.com/rs/xid v1.6.0
+	github.com/rs/zerolog v1.33.0
+	go.mongodb.org/mongo-driver v1.17.2
+	golang.org/x/crypto v0.32.0
+	golang.org/x/sys v0.29.0
+	golang.org/x/term v0.28.0
 )
 
 require (
-	github.com/bytedance/sonic v1.10.2 // indirect
-	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
-	github.com/chenzhuoyu/iasm v0.9.1 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
-	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/disintegration/imaging v1.6.2
+	github.com/jung-kurt/gofpdf v1.16.2
+	golang.org/x/sync v0.10.0
+)
+
+require (
+	github.com/bytedance/sonic v1.12.7 // indirect
+	github.com/bytedance/sonic/loader v0.2.2 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
+	github.com/gin-contrib/sse v1.0.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.16.0 // indirect
-	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/go-playground/validator/v10 v10.23.0 // indirect
+	github.com/goccy/go-json v0.10.4 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/uuid v1.5.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.17.2 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
-	github.com/leodido/go-urn v1.2.4 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/montanaflynn/stats v0.7.1 // indirect
-	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.2.11 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
 	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
 	github.com/xdg-go/scram v1.1.2 // indirect
 	github.com/xdg-go/stringprep v1.0.4 // indirect
-	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a // indirect
-	golang.org/x/arch v0.6.0 // indirect
-	golang.org/x/net v0.18.0 // indirect
-	golang.org/x/sync v0.5.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	golang.org/x/arch v0.13.0 // indirect
+	golang.org/x/image v0.23.0 // indirect
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/protobuf v1.36.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	modernc.org/libc v1.37.6 // indirect
+	modernc.org/mathutil v1.6.0 // indirect
+	modernc.org/memory v1.7.2 // indirect
+	modernc.org/sqlite v1.28.0 // indirect
 )

go.sum

@@ -1,160 +1,211 @@
-github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
-github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
-github.com/bytedance/sonic v1.10.2 h1:GQebETVBxYB7JGWJtLBi07OVzWwt+8dWA00gEVW2ZFE=
-github.com/bytedance/sonic v1.10.2/go.mod h1:iZcSUejdk5aukTND/Eu/ivjQuEL0Cu9/rf50Hi0u/g4=
-github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
-github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d h1:77cEq6EriyTZ0g/qfRdp61a3Uu/AWrgIq2s0ClJV1g0=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d/go.mod h1:8EPpVsBuRksnlj1mLy4AWzRNQYxauNi62uWcE3to6eA=
-github.com/chenzhuoyu/iasm v0.9.0 h1:9fhXjVzq5hUy2gkhhgHl95zG2cEAhw9OSGs8toWWAwo=
-github.com/chenzhuoyu/iasm v0.9.0/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
-github.com/chenzhuoyu/iasm v0.9.1 h1:tUHQJXo3NhBqw6s33wkGn9SP3bvrWLdlVIJ3hQBL7P0=
-github.com/chenzhuoyu/iasm v0.9.1/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
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-github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
-github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
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@@ -162,39 +213,59 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
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-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.1 h1:yBPeRvTftaleIgM3PZ/WBIZ7XM/eEYAaEyCwvyjq/gk=
+google.golang.org/protobuf v1.36.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.2 h1:R8FeyR1/eLmkutZOM5CWghmo5itiG9z0ktFlTVLuTmU=
+google.golang.org/protobuf v1.36.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+modernc.org/libc v1.37.6 h1:orZH3c5wmhIQFTXF+Nt+eeauyd+ZIt2BX6ARe+kD+aw=
+modernc.org/libc v1.37.6/go.mod h1:YAXkAZ8ktnkCKaN9sw/UDeUVkGYJ/YquGO4FTi5nmHE=
+modernc.org/mathutil v1.6.0 h1:fRe9+AmYlaej+64JsEEhoWuAYBkOtQiMEU7n/XgfYi4=
+modernc.org/mathutil v1.6.0/go.mod h1:Ui5Q9q1TR2gFm0AQRqQUaBWFLAhQpCwNcuhBOSedWPo=
+modernc.org/memory v1.7.2 h1:Klh90S215mmH8c9gO98QxQFsY+W451E8AnzjoE2ee1E=
+modernc.org/memory v1.7.2/go.mod h1:NO4NVCQy0N7ln+T9ngWqOQfi7ley4vpwvARR+Hjw95E=
+modernc.org/sqlite v1.28.0 h1:Zx+LyDDmXczNnEQdvPuEfcFVA2ZPyaD7UCZDjef3BHQ=
+modernc.org/sqlite v1.28.0/go.mod h1:Qxpazz0zH8Z1xCFyi5GSL3FzbtZ3fvbjmywNogldEW0=
 nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

goextVersion.go

@@ -1,5 +1,5 @@
 package goext
 
-const GoextVersion = "0.0.311"
+const GoextVersion = "0.0.558"
 
-const GoextVersionTimestamp = "2023-11-09T11:48:45+0100"
+const GoextVersionTimestamp = "2025-01-10T15:36:23+0100"

gojson/LICENSE

@@ -1,27 +0,0 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

gojson/README.md

@@ -4,9 +4,12 @@ JSON serializer which serializes nil-Arrays as `[]` and nil-maps als `{}`.
 
 Idea from: https://github.com/homelight/json
 
-Forked from https://github.com/golang/go/tree/547e8e22fe565d65d1fd4d6e71436a5a855447b0/src/encoding/json ( tag go1.20.2 )
+Forked from https://github.com/golang/go/tree/194de8fbfaf4c3ed54e1a3c1b14fc67a830b8d95/src/encoding/json ( tag go1.23.4 )
+  -> https://github.com/golang/go/tree/go1.23.4/src/encoding/json
 
 Added:
 
  - `MarshalSafeCollections()` method
- - `Encoder.nilSafeSlices` and `Encoder.nilSafeMaps` fields
+ - `Encoder.nilSafeSlices` and `Encoder.nilSafeMaps` fields
+ - `Add 'tagkey' to use different key than json (set on Decoder struct)`
+ - `Add 'jsonfilter' to filter printed fields (set via MarshalSafeCollections)`

gojson/decode.go

@@ -17,14 +17,15 @@ import (
 	"unicode"
 	"unicode/utf16"
 	"unicode/utf8"
+	_ "unsafe" // for linkname
 )
 
 // Unmarshal parses the JSON-encoded data and stores the result
 // in the value pointed to by v. If v is nil or not a pointer,
-// Unmarshal returns an InvalidUnmarshalError.
+// Unmarshal returns an [InvalidUnmarshalError].
 //
 // Unmarshal uses the inverse of the encodings that
-// Marshal uses, allocating maps, slices, and pointers as necessary,
+// [Marshal] uses, allocating maps, slices, and pointers as necessary,
 // with the following additional rules:
 //
 // To unmarshal JSON into a pointer, Unmarshal first handles the case of
@@ -33,28 +34,28 @@ import (
 // the value pointed at by the pointer. If the pointer is nil, Unmarshal
 // allocates a new value for it to point to.
 //
-// To unmarshal JSON into a value implementing the Unmarshaler interface,
-// Unmarshal calls that value's UnmarshalJSON method, including
+// To unmarshal JSON into a value implementing [Unmarshaler],
+// Unmarshal calls that value's [Unmarshaler.UnmarshalJSON] method, including
 // when the input is a JSON null.
-// Otherwise, if the value implements encoding.TextUnmarshaler
-// and the input is a JSON quoted string, Unmarshal calls that value's
-// UnmarshalText method with the unquoted form of the string.
+// Otherwise, if the value implements [encoding.TextUnmarshaler]
+// and the input is a JSON quoted string, Unmarshal calls
+// [encoding.TextUnmarshaler.UnmarshalText] with the unquoted form of the string.
 //
 // To unmarshal JSON into a struct, Unmarshal matches incoming object
-// keys to the keys used by Marshal (either the struct field name or its tag),
+// keys to the keys used by [Marshal] (either the struct field name or its tag),
 // preferring an exact match but also accepting a case-insensitive match. By
 // default, object keys which don't have a corresponding struct field are
-// ignored (see Decoder.DisallowUnknownFields for an alternative).
+// ignored (see [Decoder.DisallowUnknownFields] for an alternative).
 //
 // To unmarshal JSON into an interface value,
 // Unmarshal stores one of these in the interface value:
 //
-//	bool, for JSON booleans
-//	float64, for JSON numbers
-//	string, for JSON strings
-//	[]interface{}, for JSON arrays
-//	map[string]interface{}, for JSON objects
-//	nil for JSON null
+//   - bool, for JSON booleans
+//   - float64, for JSON numbers
+//   - string, for JSON strings
+//   - []interface{}, for JSON arrays
+//   - map[string]interface{}, for JSON objects
+//   - nil for JSON null
 //
 // To unmarshal a JSON array into a slice, Unmarshal resets the slice length
 // to zero and then appends each element to the slice.
@@ -72,16 +73,15 @@ import (
 // use. If the map is nil, Unmarshal allocates a new map. Otherwise Unmarshal
 // reuses the existing map, keeping existing entries. Unmarshal then stores
 // key-value pairs from the JSON object into the map. The map's key type must
-// either be any string type, an integer, implement json.Unmarshaler, or
-// implement encoding.TextUnmarshaler.
+// either be any string type, an integer, or implement [encoding.TextUnmarshaler].
 //
-// If the JSON-encoded data contain a syntax error, Unmarshal returns a SyntaxError.
+// If the JSON-encoded data contain a syntax error, Unmarshal returns a [SyntaxError].
 //
 // If a JSON value is not appropriate for a given target type,
 // or if a JSON number overflows the target type, Unmarshal
 // skips that field and completes the unmarshaling as best it can.
 // If no more serious errors are encountered, Unmarshal returns
-// an UnmarshalTypeError describing the earliest such error. In any
+// an [UnmarshalTypeError] describing the earliest such error. In any
 // case, it's not guaranteed that all the remaining fields following
 // the problematic one will be unmarshaled into the target object.
 //
@@ -114,7 +114,7 @@ func Unmarshal(data []byte, v any) error {
 // a JSON value. UnmarshalJSON must copy the JSON data
 // if it wishes to retain the data after returning.
 //
-// By convention, to approximate the behavior of Unmarshal itself,
+// By convention, to approximate the behavior of [Unmarshal] itself,
 // Unmarshalers implement UnmarshalJSON([]byte("null")) as a no-op.
 type Unmarshaler interface {
 	UnmarshalJSON([]byte) error
@@ -151,8 +151,8 @@ func (e *UnmarshalFieldError) Error() string {
 	return "json: cannot unmarshal object key " + strconv.Quote(e.Key) + " into unexported field " + e.Field.Name + " of type " + e.Type.String()
 }
 
-// An InvalidUnmarshalError describes an invalid argument passed to Unmarshal.
-// (The argument to Unmarshal must be a non-nil pointer.)
+// An InvalidUnmarshalError describes an invalid argument passed to [Unmarshal].
+// (The argument to [Unmarshal] must be a non-nil pointer.)
 type InvalidUnmarshalError struct {
 	Type reflect.Type
 }
@@ -217,6 +217,7 @@ type decodeState struct {
 	savedError            error
 	useNumber             bool
 	disallowUnknownFields bool
+	tagkey                *string
 }
 
 // readIndex returns the position of the last byte read.
@@ -540,17 +541,10 @@ func (d *decodeState) array(v reflect.Value) error {
 			break
 		}
 
-		// Get element of array, growing if necessary.
+		// Expand slice length, growing the slice if necessary.
 		if v.Kind() == reflect.Slice {
-			// Grow slice if necessary
 			if i >= v.Cap() {
-				newcap := v.Cap() + v.Cap()/2
-				if newcap < 4 {
-					newcap = 4
-				}
-				newv := reflect.MakeSlice(v.Type(), v.Len(), newcap)
-				reflect.Copy(newv, v)
-				v.Set(newv)
+				v.Grow(1)
 			}
 			if i >= v.Len() {
 				v.SetLen(i + 1)
@@ -584,13 +578,11 @@ func (d *decodeState) array(v reflect.Value) error {
 
 	if i < v.Len() {
 		if v.Kind() == reflect.Array {
-			// Array. Zero the rest.
-			z := reflect.Zero(v.Type().Elem())
 			for ; i < v.Len(); i++ {
-				v.Index(i).Set(z)
+				v.Index(i).SetZero() // zero remainder of array
 			}
 		} else {
-			v.SetLen(i)
+			v.SetLen(i) // truncate the slice
 		}
 	}
 	if i == 0 && v.Kind() == reflect.Slice {
@@ -600,7 +592,7 @@ func (d *decodeState) array(v reflect.Value) error {
 }
 
 var nullLiteral = []byte("null")
-var textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
+var textUnmarshalerType = reflect.TypeFor[encoding.TextUnmarshaler]()
 
 // object consumes an object from d.data[d.off-1:], decoding into v.
 // The first byte ('{') of the object has been read already.
@@ -652,7 +644,11 @@ func (d *decodeState) object(v reflect.Value) error {
 			v.Set(reflect.MakeMap(t))
 		}
 	case reflect.Struct:
-		fields = cachedTypeFields(t)
+		tagkey := "json"
+		if d.tagkey != nil {
+			tagkey = *d.tagkey
+		}
+		fields = cachedTypeFields(t, tagkey)
 		// ok
 	default:
 		d.saveError(&UnmarshalTypeError{Value: "object", Type: t, Offset: int64(d.off)})
@@ -695,24 +691,13 @@ func (d *decodeState) object(v reflect.Value) error {
 			if !mapElem.IsValid() {
 				mapElem = reflect.New(elemType).Elem()
 			} else {
-				mapElem.Set(reflect.Zero(elemType))
+				mapElem.SetZero()
 			}
 			subv = mapElem
 		} else {
-			var f *field
-			if i, ok := fields.nameIndex[string(key)]; ok {
-				// Found an exact name match.
-				f = &fields.list[i]
-			} else {
-				// Fall back to the expensive case-insensitive
-				// linear search.
-				for i := range fields.list {
-					ff := &fields.list[i]
-					if ff.equalFold(ff.nameBytes, key) {
-						f = ff
-						break
-					}
-				}
+			f := fields.byExactName[string(key)]
+			if f == nil {
+				f = fields.byFoldedName[string(foldName(key))]
 			}
 			if f != nil {
 				subv = v
@@ -782,33 +767,35 @@ func (d *decodeState) object(v reflect.Value) error {
 		if v.Kind() == reflect.Map {
 			kt := t.Key()
 			var kv reflect.Value
-			switch {
-			case reflect.PointerTo(kt).Implements(textUnmarshalerType):
+			if reflect.PointerTo(kt).Implements(textUnmarshalerType) {
 				kv = reflect.New(kt)
 				if err := d.literalStore(item, kv, true); err != nil {
 					return err
 				}
 				kv = kv.Elem()
-			case kt.Kind() == reflect.String:
-				kv = reflect.ValueOf(key).Convert(kt)
-			default:
+			} else {
 				switch kt.Kind() {
+				case reflect.String:
+					kv = reflect.New(kt).Elem()
+					kv.SetString(string(key))
 				case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 					s := string(key)
 					n, err := strconv.ParseInt(s, 10, 64)
-					if err != nil || reflect.Zero(kt).OverflowInt(n) {
+					if err != nil || kt.OverflowInt(n) {
 						d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: kt, Offset: int64(start + 1)})
 						break
 					}
-					kv = reflect.ValueOf(n).Convert(kt)
+					kv = reflect.New(kt).Elem()
+					kv.SetInt(n)
 				case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 					s := string(key)
 					n, err := strconv.ParseUint(s, 10, 64)
-					if err != nil || reflect.Zero(kt).OverflowUint(n) {
+					if err != nil || kt.OverflowUint(n) {
 						d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: kt, Offset: int64(start + 1)})
 						break
 					}
-					kv = reflect.ValueOf(n).Convert(kt)
+					kv = reflect.New(kt).Elem()
+					kv.SetUint(n)
 				default:
 					panic("json: Unexpected key type") // should never occur
 				}
@@ -847,12 +834,12 @@ func (d *decodeState) convertNumber(s string) (any, error) {
 	}
 	f, err := strconv.ParseFloat(s, 64)
 	if err != nil {
-		return nil, &UnmarshalTypeError{Value: "number " + s, Type: reflect.TypeOf(0.0), Offset: int64(d.off)}
+		return nil, &UnmarshalTypeError{Value: "number " + s, Type: reflect.TypeFor[float64](), Offset: int64(d.off)}
 	}
 	return f, nil
 }
 
-var numberType = reflect.TypeOf(Number(""))
+var numberType = reflect.TypeFor[Number]()
 
 // literalStore decodes a literal stored in item into v.
 //
@@ -862,7 +849,7 @@ var numberType = reflect.TypeOf(Number(""))
 func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool) error {
 	// Check for unmarshaler.
 	if len(item) == 0 {
-		//Empty string given
+		// Empty string given.
 		d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
 		return nil
 	}
@@ -909,7 +896,7 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 		}
 		switch v.Kind() {
 		case reflect.Interface, reflect.Pointer, reflect.Map, reflect.Slice:
-			v.Set(reflect.Zero(v.Type()))
+			v.SetZero()
 			// otherwise, ignore null for primitives/string
 		}
 	case 't', 'f': // true, false
@@ -961,10 +948,11 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 			}
 			v.SetBytes(b[:n])
 		case reflect.String:
-			if v.Type() == numberType && !isValidNumber(string(s)) {
+			t := string(s)
+			if v.Type() == numberType && !isValidNumber(t) {
 				return fmt.Errorf("json: invalid number literal, trying to unmarshal %q into Number", item)
 			}
-			v.SetString(string(s))
+			v.SetString(t)
 		case reflect.Interface:
 			if v.NumMethod() == 0 {
 				v.Set(reflect.ValueOf(string(s)))
@@ -980,13 +968,12 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 			}
 			panic(phasePanicMsg)
 		}
-		s := string(item)
 		switch v.Kind() {
 		default:
 			if v.Kind() == reflect.String && v.Type() == numberType {
 				// s must be a valid number, because it's
 				// already been tokenized.
-				v.SetString(s)
+				v.SetString(string(item))
 				break
 			}
 			if fromQuoted {
@@ -994,7 +981,7 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 			}
 			d.saveError(&UnmarshalTypeError{Value: "number", Type: v.Type(), Offset: int64(d.readIndex())})
 		case reflect.Interface:
-			n, err := d.convertNumber(s)
+			n, err := d.convertNumber(string(item))
 			if err != nil {
 				d.saveError(err)
 				break
@@ -1006,25 +993,25 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
 			v.Set(reflect.ValueOf(n))
 
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-			n, err := strconv.ParseInt(s, 10, 64)
+			n, err := strconv.ParseInt(string(item), 10, 64)
 			if err != nil || v.OverflowInt(n) {
-				d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())})
+				d.saveError(&UnmarshalTypeError{Value: "number " + string(item), Type: v.Type(), Offset: int64(d.readIndex())})
 				break
 			}
 			v.SetInt(n)
 
 		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-			n, err := strconv.ParseUint(s, 10, 64)
+			n, err := strconv.ParseUint(string(item), 10, 64)
 			if err != nil || v.OverflowUint(n) {
-				d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())})
+				d.saveError(&UnmarshalTypeError{Value: "number " + string(item), Type: v.Type(), Offset: int64(d.readIndex())})
 				break
 			}
 			v.SetUint(n)
 
 		case reflect.Float32, reflect.Float64:
-			n, err := strconv.ParseFloat(s, v.Type().Bits())
+			n, err := strconv.ParseFloat(string(item), v.Type().Bits())
 			if err != nil || v.OverflowFloat(n) {
-				d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())})
+				d.saveError(&UnmarshalTypeError{Value: "number " + string(item), Type: v.Type(), Offset: int64(d.readIndex())})
 				break
 			}
 			v.SetFloat(n)
@@ -1196,6 +1183,15 @@ func unquote(s []byte) (t string, ok bool) {
 	return
 }
 
+// unquoteBytes should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname unquoteBytes
 func unquoteBytes(s []byte) (t []byte, ok bool) {
 	if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' {
 		return

gojson/fold.go

@@ -5,140 +5,44 @@
 package json
 
 import (
-	"bytes"
+	"unicode"
 	"unicode/utf8"
 )
 
-const (
-	caseMask     = ^byte(0x20) // Mask to ignore case in ASCII.
-	kelvin       = '\u212a'
-	smallLongEss = '\u017f'
-)
-
-// foldFunc returns one of four different case folding equivalence
-// functions, from most general (and slow) to fastest:
-//
-// 1) bytes.EqualFold, if the key s contains any non-ASCII UTF-8
-// 2) equalFoldRight, if s contains special folding ASCII ('k', 'K', 's', 'S')
-// 3) asciiEqualFold, no special, but includes non-letters (including _)
-// 4) simpleLetterEqualFold, no specials, no non-letters.
-//
-// The letters S and K are special because they map to 3 runes, not just 2:
-//   - S maps to s and to U+017F 'ſ' Latin small letter long s
-//   - k maps to K and to U+212A 'K' Kelvin sign
-//
-// See https://play.golang.org/p/tTxjOc0OGo
-//
-// The returned function is specialized for matching against s and
-// should only be given s. It's not curried for performance reasons.
-func foldFunc(s []byte) func(s, t []byte) bool {
-	nonLetter := false
-	special := false // special letter
-	for _, b := range s {
-		if b >= utf8.RuneSelf {
-			return bytes.EqualFold
-		}
-		upper := b & caseMask
-		if upper < 'A' || upper > 'Z' {
-			nonLetter = true
-		} else if upper == 'K' || upper == 'S' {
-			// See above for why these letters are special.
-			special = true
-		}
-	}
-	if special {
-		return equalFoldRight
-	}
-	if nonLetter {
-		return asciiEqualFold
-	}
-	return simpleLetterEqualFold
+// foldName returns a folded string such that foldName(x) == foldName(y)
+// is identical to bytes.EqualFold(x, y).
+func foldName(in []byte) []byte {
+	// This is inlinable to take advantage of "function outlining".
+	var arr [32]byte // large enough for most JSON names
+	return appendFoldedName(arr[:0], in)
 }
 
-// equalFoldRight is a specialization of bytes.EqualFold when s is
-// known to be all ASCII (including punctuation), but contains an 's',
-// 'S', 'k', or 'K', requiring a Unicode fold on the bytes in t.
-// See comments on foldFunc.
-func equalFoldRight(s, t []byte) bool {
-	for _, sb := range s {
-		if len(t) == 0 {
-			return false
-		}
-		tb := t[0]
-		if tb < utf8.RuneSelf {
-			if sb != tb {
-				sbUpper := sb & caseMask
-				if 'A' <= sbUpper && sbUpper <= 'Z' {
-					if sbUpper != tb&caseMask {
-						return false
-					}
-				} else {
-					return false
-				}
+func appendFoldedName(out, in []byte) []byte {
+	for i := 0; i < len(in); {
+		// Handle single-byte ASCII.
+		if c := in[i]; c < utf8.RuneSelf {
+			if 'a' <= c && c <= 'z' {
+				c -= 'a' - 'A'
 			}
-			t = t[1:]
+			out = append(out, c)
+			i++
 			continue
 		}
-		// sb is ASCII and t is not. t must be either kelvin
-		// sign or long s; sb must be s, S, k, or K.
-		tr, size := utf8.DecodeRune(t)
-		switch sb {
-		case 's', 'S':
-			if tr != smallLongEss {
-				return false
-			}
-		case 'k', 'K':
-			if tr != kelvin {
-				return false
-			}
-		default:
-			return false
-		}
-		t = t[size:]
-
+		// Handle multi-byte Unicode.
+		r, n := utf8.DecodeRune(in[i:])
+		out = utf8.AppendRune(out, foldRune(r))
+		i += n
 	}
-	if len(t) > 0 {
-		return false
-	}
-	return true
+	return out
 }
 
-// asciiEqualFold is a specialization of bytes.EqualFold for use when
-// s is all ASCII (but may contain non-letters) and contains no
-// special-folding letters.
-// See comments on foldFunc.
-func asciiEqualFold(s, t []byte) bool {
-	if len(s) != len(t) {
-		return false
-	}
-	for i, sb := range s {
-		tb := t[i]
-		if sb == tb {
-			continue
-		}
-		if ('a' <= sb && sb <= 'z') || ('A' <= sb && sb <= 'Z') {
-			if sb&caseMask != tb&caseMask {
-				return false
-			}
-		} else {
-			return false
+// foldRune is returns the smallest rune for all runes in the same fold set.
+func foldRune(r rune) rune {
+	for {
+		r2 := unicode.SimpleFold(r)
+		if r2 <= r {
+			return r2
 		}
+		r = r2
 	}
-	return true
-}
-
-// simpleLetterEqualFold is a specialization of bytes.EqualFold for
-// use when s is all ASCII letters (no underscores, etc) and also
-// doesn't contain 'k', 'K', 's', or 'S'.
-// See comments on foldFunc.
-func simpleLetterEqualFold(s, t []byte) bool {
-	if len(s) != len(t) {
-		return false
-	}
-	for i, b := range s {
-		if b&caseMask != t[i]&caseMask {
-			return false
-		}
-	}
-	return true
 }

gojson/fold_test.go

@@ -6,111 +6,45 @@ package json
 
 import (
 	"bytes"
-	"strings"
 	"testing"
-	"unicode/utf8"
 )
 
-var foldTests = []struct {
-	fn   func(s, t []byte) bool
-	s, t string
-	want bool
-}{
-	{equalFoldRight, "", "", true},
-	{equalFoldRight, "a", "a", true},
-	{equalFoldRight, "", "a", false},
-	{equalFoldRight, "a", "", false},
-	{equalFoldRight, "a", "A", true},
-	{equalFoldRight, "AB", "ab", true},
-	{equalFoldRight, "AB", "ac", false},
-	{equalFoldRight, "sbkKc", "ſbKKc", true},
-	{equalFoldRight, "SbKkc", "ſbKKc", true},
-	{equalFoldRight, "SbKkc", "ſbKK", false},
-	{equalFoldRight, "e", "é", false},
-	{equalFoldRight, "s", "S", true},
-
-	{simpleLetterEqualFold, "", "", true},
-	{simpleLetterEqualFold, "abc", "abc", true},
-	{simpleLetterEqualFold, "abc", "ABC", true},
-	{simpleLetterEqualFold, "abc", "ABCD", false},
-	{simpleLetterEqualFold, "abc", "xxx", false},
-
-	{asciiEqualFold, "a_B", "A_b", true},
-	{asciiEqualFold, "aa@", "aa`", false}, // verify 0x40 and 0x60 aren't case-equivalent
-}
-
-func TestFold(t *testing.T) {
-	for i, tt := range foldTests {
-		if got := tt.fn([]byte(tt.s), []byte(tt.t)); got != tt.want {
-			t.Errorf("%d. %q, %q = %v; want %v", i, tt.s, tt.t, got, tt.want)
+func FuzzEqualFold(f *testing.F) {
+	for _, ss := range [][2]string{
+		{"", ""},
+		{"123abc", "123ABC"},
+		{"αβδ", "ΑΒΔ"},
+		{"abc", "xyz"},
+		{"abc", "XYZ"},
+		{"1", "2"},
+		{"hello, world!", "hello, world!"},
+		{"hello, world!", "Hello, World!"},
+		{"hello, world!", "HELLO, WORLD!"},
+		{"hello, world!", "jello, world!"},
+		{"γειά, κόσμε!", "γειά, κόσμε!"},
+		{"γειά, κόσμε!", "Γειά, Κόσμε!"},
+		{"γειά, κόσμε!", "ΓΕΙΆ, ΚΌΣΜΕ!"},
+		{"γειά, κόσμε!", "ΛΕΙΆ, ΚΌΣΜΕ!"},
+		{"AESKey", "aesKey"},
+		{"AESKEY", "aes_key"},
+		{"aes_key", "AES_KEY"},
+		{"AES_KEY", "aes-key"},
+		{"aes-key", "AES-KEY"},
+		{"AES-KEY", "aesKey"},
+		{"aesKey", "AesKey"},
+		{"AesKey", "AESKey"},
+		{"AESKey", "aeskey"},
+		{"DESKey", "aeskey"},
+		{"AES Key", "aeskey"},
+	} {
+		f.Add([]byte(ss[0]), []byte(ss[1]))
+	}
+	equalFold := func(x, y []byte) bool { return string(foldName(x)) == string(foldName(y)) }
+	f.Fuzz(func(t *testing.T, x, y []byte) {
+		got := equalFold(x, y)
+		want := bytes.EqualFold(x, y)
+		if got != want {
+			t.Errorf("equalFold(%q, %q) = %v, want %v", x, y, got, want)
 		}
-		truth := strings.EqualFold(tt.s, tt.t)
-		if truth != tt.want {
-			t.Errorf("strings.EqualFold doesn't agree with case %d", i)
-		}
-	}
-}
-
-func TestFoldAgainstUnicode(t *testing.T) {
-	const bufSize = 5
-	buf1 := make([]byte, 0, bufSize)
-	buf2 := make([]byte, 0, bufSize)
-	var runes []rune
-	for i := 0x20; i <= 0x7f; i++ {
-		runes = append(runes, rune(i))
-	}
-	runes = append(runes, kelvin, smallLongEss)
-
-	funcs := []struct {
-		name   string
-		fold   func(s, t []byte) bool
-		letter bool // must be ASCII letter
-		simple bool // must be simple ASCII letter (not 'S' or 'K')
-	}{
-		{
-			name: "equalFoldRight",
-			fold: equalFoldRight,
-		},
-		{
-			name:   "asciiEqualFold",
-			fold:   asciiEqualFold,
-			simple: true,
-		},
-		{
-			name:   "simpleLetterEqualFold",
-			fold:   simpleLetterEqualFold,
-			simple: true,
-			letter: true,
-		},
-	}
-
-	for _, ff := range funcs {
-		for _, r := range runes {
-			if r >= utf8.RuneSelf {
-				continue
-			}
-			if ff.letter && !isASCIILetter(byte(r)) {
-				continue
-			}
-			if ff.simple && (r == 's' || r == 'S' || r == 'k' || r == 'K') {
-				continue
-			}
-			for _, r2 := range runes {
-				buf1 := append(buf1[:0], 'x')
-				buf2 := append(buf2[:0], 'x')
-				buf1 = buf1[:1+utf8.EncodeRune(buf1[1:bufSize], r)]
-				buf2 = buf2[:1+utf8.EncodeRune(buf2[1:bufSize], r2)]
-				buf1 = append(buf1, 'x')
-				buf2 = append(buf2, 'x')
-				want := bytes.EqualFold(buf1, buf2)
-				if got := ff.fold(buf1, buf2); got != want {
-					t.Errorf("%s(%q, %q) = %v; want %v", ff.name, buf1, buf2, got, want)
-				}
-			}
-		}
-	}
-}
-
-func isASCIILetter(b byte) bool {
-	return ('A' <= b && b <= 'Z') || ('a' <= b && b <= 'z')
+	})
 }

gojson/fuzz.go

@@ -1,42 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build gofuzz
-
-package json
-
-import (
-	"fmt"
-)
-
-func Fuzz(data []byte) (score int) {
-	for _, ctor := range []func() any{
-		func() any { return new(any) },
-		func() any { return new(map[string]any) },
-		func() any { return new([]any) },
-	} {
-		v := ctor()
-		err := Unmarshal(data, v)
-		if err != nil {
-			continue
-		}
-		score = 1
-
-		m, err := Marshal(v)
-		if err != nil {
-			fmt.Printf("v=%#v\n", v)
-			panic(err)
-		}
-
-		u := ctor()
-		err = Unmarshal(m, u)
-		if err != nil {
-			fmt.Printf("v=%#v\n", v)
-			fmt.Printf("m=%s\n", m)
-			panic(err)
-		}
-	}
-
-	return
-}

gojson/gionic.go

@@ -25,7 +25,6 @@ func (r GoJsonRender) Render(w http.ResponseWriter) error {
 	if val := header["Content-Type"]; len(val) == 0 {
 		header["Content-Type"] = []string{"application/json; charset=utf-8"}
 	}
-
 	jsonBytes, err := MarshalSafeCollections(r.Data, r.NilSafeSlices, r.NilSafeMaps, r.Indent, r.Filter)
 	if err != nil {
 		panic(err)
@@ -37,6 +36,14 @@ func (r GoJsonRender) Render(w http.ResponseWriter) error {
 	return nil
 }
 
+func (r GoJsonRender) RenderString() (string, error) {
+	jsonBytes, err := MarshalSafeCollections(r.Data, r.NilSafeSlices, r.NilSafeMaps, r.Indent, r.Filter)
+	if err != nil {
+		panic(err)
+	}
+	return string(jsonBytes), nil
+}
+
 func (r GoJsonRender) WriteContentType(w http.ResponseWriter) {
 	header := w.Header()
 	if val := header["Content-Type"]; len(val) == 0 {

gojson/indent.go

@@ -4,38 +4,67 @@
 
 package json
 
-import (
-	"bytes"
-)
+import "bytes"
+
+// HTMLEscape appends to dst the JSON-encoded src with <, >, &, U+2028 and U+2029
+// characters inside string literals changed to \u003c, \u003e, \u0026, \u2028, \u2029
+// so that the JSON will be safe to embed inside HTML <script> tags.
+// For historical reasons, web browsers don't honor standard HTML
+// escaping within <script> tags, so an alternative JSON encoding must be used.
+func HTMLEscape(dst *bytes.Buffer, src []byte) {
+	dst.Grow(len(src))
+	dst.Write(appendHTMLEscape(dst.AvailableBuffer(), src))
+}
+
+func appendHTMLEscape(dst, src []byte) []byte {
+	// The characters can only appear in string literals,
+	// so just scan the string one byte at a time.
+	start := 0
+	for i, c := range src {
+		if c == '<' || c == '>' || c == '&' {
+			dst = append(dst, src[start:i]...)
+			dst = append(dst, '\\', 'u', '0', '0', hex[c>>4], hex[c&0xF])
+			start = i + 1
+		}
+		// Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9).
+		if c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 {
+			dst = append(dst, src[start:i]...)
+			dst = append(dst, '\\', 'u', '2', '0', '2', hex[src[i+2]&0xF])
+			start = i + len("\u2029")
+		}
+	}
+	return append(dst, src[start:]...)
+}
 
 // Compact appends to dst the JSON-encoded src with
 // insignificant space characters elided.
 func Compact(dst *bytes.Buffer, src []byte) error {
-	return compact(dst, src, false)
+	dst.Grow(len(src))
+	b := dst.AvailableBuffer()
+	b, err := appendCompact(b, src, false)
+	dst.Write(b)
+	return err
 }
 
-func compact(dst *bytes.Buffer, src []byte, escape bool) error {
-	origLen := dst.Len()
+func appendCompact(dst, src []byte, escape bool) ([]byte, error) {
+	origLen := len(dst)
 	scan := newScanner()
 	defer freeScanner(scan)
 	start := 0
 	for i, c := range src {
 		if escape && (c == '<' || c == '>' || c == '&') {
 			if start < i {
-				dst.Write(src[start:i])
+				dst = append(dst, src[start:i]...)
 			}
-			dst.WriteString(`\u00`)
-			dst.WriteByte(hex[c>>4])
-			dst.WriteByte(hex[c&0xF])
+			dst = append(dst, '\\', 'u', '0', '0', hex[c>>4], hex[c&0xF])
 			start = i + 1
 		}
 		// Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9).
 		if escape && c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 {
 			if start < i {
-				dst.Write(src[start:i])
+				dst = append(dst, src[start:i]...)
 			}
-			dst.WriteString(`\u202`)
-			dst.WriteByte(hex[src[i+2]&0xF])
+			dst = append(dst, '\\', 'u', '2', '0', '2', hex[src[i+2]&0xF])
 			start = i + 3
 		}
 		v := scan.step(scan, c)
@@ -44,29 +73,37 @@ func compact(dst *bytes.Buffer, src []byte, escape bool) error {
 				break
 			}
 			if start < i {
-				dst.Write(src[start:i])
+				dst = append(dst, src[start:i]...)
 			}
 			start = i + 1
 		}
 	}
 	if scan.eof() == scanError {
-		dst.Truncate(origLen)
-		return scan.err
+		return dst[:origLen], scan.err
 	}
 	if start < len(src) {
-		dst.Write(src[start:])
+		dst = append(dst, src[start:]...)
 	}
-	return nil
+	return dst, nil
 }
 
-func newline(dst *bytes.Buffer, prefix, indent string, depth int) {
-	dst.WriteByte('\n')
-	dst.WriteString(prefix)
+func appendNewline(dst []byte, prefix, indent string, depth int) []byte {
+	dst = append(dst, '\n')
+	dst = append(dst, prefix...)
 	for i := 0; i < depth; i++ {
-		dst.WriteString(indent)
+		dst = append(dst, indent...)
 	}
+	return dst
 }
 
+// indentGrowthFactor specifies the growth factor of indenting JSON input.
+// Empirically, the growth factor was measured to be between 1.4x to 1.8x
+// for some set of compacted JSON with the indent being a single tab.
+// Specify a growth factor slightly larger than what is observed
+// to reduce probability of allocation in appendIndent.
+// A factor no higher than 2 ensures that wasted space never exceeds 50%.
+const indentGrowthFactor = 2
+
 // Indent appends to dst an indented form of the JSON-encoded src.
 // Each element in a JSON object or array begins on a new,
 // indented line beginning with prefix followed by one or more
@@ -79,7 +116,15 @@ func newline(dst *bytes.Buffer, prefix, indent string, depth int) {
 // For example, if src has no trailing spaces, neither will dst;
 // if src ends in a trailing newline, so will dst.
 func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
-	origLen := dst.Len()
+	dst.Grow(indentGrowthFactor * len(src))
+	b := dst.AvailableBuffer()
+	b, err := appendIndent(b, src, prefix, indent)
+	dst.Write(b)
+	return err
+}
+
+func appendIndent(dst, src []byte, prefix, indent string) ([]byte, error) {
+	origLen := len(dst)
 	scan := newScanner()
 	defer freeScanner(scan)
 	needIndent := false
@@ -96,13 +141,13 @@ func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
 		if needIndent && v != scanEndObject && v != scanEndArray {
 			needIndent = false
 			depth++
-			newline(dst, prefix, indent, depth)
+			dst = appendNewline(dst, prefix, indent, depth)
 		}
 
 		// Emit semantically uninteresting bytes
 		// (in particular, punctuation in strings) unmodified.
 		if v == scanContinue {
-			dst.WriteByte(c)
+			dst = append(dst, c)
 			continue
 		}
 
@@ -111,33 +156,27 @@ func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
 		case '{', '[':
 			// delay indent so that empty object and array are formatted as {} and [].
 			needIndent = true
-			dst.WriteByte(c)
-
+			dst = append(dst, c)
 		case ',':
-			dst.WriteByte(c)
-			newline(dst, prefix, indent, depth)
-
+			dst = append(dst, c)
+			dst = appendNewline(dst, prefix, indent, depth)
 		case ':':
-			dst.WriteByte(c)
-			dst.WriteByte(' ')
-
+			dst = append(dst, c, ' ')
 		case '}', ']':
 			if needIndent {
 				// suppress indent in empty object/array
 				needIndent = false
 			} else {
 				depth--
-				newline(dst, prefix, indent, depth)
+				dst = appendNewline(dst, prefix, indent, depth)
 			}
-			dst.WriteByte(c)
-
+			dst = append(dst, c)
 		default:
-			dst.WriteByte(c)
+			dst = append(dst, c)
 		}
 	}
 	if scan.eof() == scanError {
-		dst.Truncate(origLen)
-		return scan.err
+		return dst[:origLen], scan.err
 	}
-	return nil
+	return dst, nil
 }

gojson/number_test.go

@@ -116,18 +116,3 @@ func TestNumberIsValid(t *testing.T) {
 		}
 	}
 }
-
-func BenchmarkNumberIsValid(b *testing.B) {
-	s := "-61657.61667E+61673"
-	for i := 0; i < b.N; i++ {
-		isValidNumber(s)
-	}
-}
-
-func BenchmarkNumberIsValidRegexp(b *testing.B) {
-	var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
-	s := "-61657.61667E+61673"
-	for i := 0; i < b.N; i++ {
-		jsonNumberRegexp.MatchString(s)
-	}
-}

gojson/scanner.go

@@ -43,7 +43,7 @@ func checkValid(data []byte, scan *scanner) error {
 }
 
 // A SyntaxError is a description of a JSON syntax error.
-// Unmarshal will return a SyntaxError if the JSON can't be parsed.
+// [Unmarshal] will return a SyntaxError if the JSON can't be parsed.
 type SyntaxError struct {
 	msg    string // description of error
 	Offset int64  // error occurred after reading Offset bytes
@@ -594,7 +594,7 @@ func (s *scanner) error(c byte, context string) int {
 	return scanError
 }
 
-// quoteChar formats c as a quoted character literal
+// quoteChar formats c as a quoted character literal.
 func quoteChar(c byte) string {
 	// special cases - different from quoted strings
 	if c == '\'' {

gojson/scanner_test.go

@@ -9,51 +9,59 @@ import (
 	"math"
 	"math/rand"
 	"reflect"
+	"strings"
 	"testing"
 )
 
-var validTests = []struct {
-	data string
-	ok   bool
-}{
-	{`foo`, false},
-	{`}{`, false},
-	{`{]`, false},
-	{`{}`, true},
-	{`{"foo":"bar"}`, true},
-	{`{"foo":"bar","bar":{"baz":["qux"]}}`, true},
+func indentNewlines(s string) string {
+	return strings.Join(strings.Split(s, "\n"), "\n\t")
+}
+
+func stripWhitespace(s string) string {
+	return strings.Map(func(r rune) rune {
+		if r == ' ' || r == '\n' || r == '\r' || r == '\t' {
+			return -1
+		}
+		return r
+	}, s)
 }
 
 func TestValid(t *testing.T) {
-	for _, tt := range validTests {
-		if ok := Valid([]byte(tt.data)); ok != tt.ok {
-			t.Errorf("Valid(%#q) = %v, want %v", tt.data, ok, tt.ok)
-		}
+	tests := []struct {
+		CaseName
+		data string
+		ok   bool
+	}{
+		{Name(""), `foo`, false},
+		{Name(""), `}{`, false},
+		{Name(""), `{]`, false},
+		{Name(""), `{}`, true},
+		{Name(""), `{"foo":"bar"}`, true},
+		{Name(""), `{"foo":"bar","bar":{"baz":["qux"]}}`, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			if ok := Valid([]byte(tt.data)); ok != tt.ok {
+				t.Errorf("%s: Valid(`%s`) = %v, want %v", tt.Where, tt.data, ok, tt.ok)
+			}
+		})
 	}
 }
 
-// Tests of simple examples.
-
-type example struct {
-	compact string
-	indent  string
-}
-
-var examples = []example{
-	{`1`, `1`},
-	{`{}`, `{}`},
-	{`[]`, `[]`},
-	{`{"":2}`, "{\n\t\"\": 2\n}"},
-	{`[3]`, "[\n\t3\n]"},
-	{`[1,2,3]`, "[\n\t1,\n\t2,\n\t3\n]"},
-	{`{"x":1}`, "{\n\t\"x\": 1\n}"},
-	{ex1, ex1i},
-	{"{\"\":\"<>&\u2028\u2029\"}", "{\n\t\"\": \"<>&\u2028\u2029\"\n}"}, // See golang.org/issue/34070
-}
-
-var ex1 = `[true,false,null,"x",1,1.5,0,-5e+2]`
-
-var ex1i = `[
+func TestCompactAndIndent(t *testing.T) {
+	tests := []struct {
+		CaseName
+		compact string
+		indent  string
+	}{
+		{Name(""), `1`, `1`},
+		{Name(""), `{}`, `{}`},
+		{Name(""), `[]`, `[]`},
+		{Name(""), `{"":2}`, "{\n\t\"\": 2\n}"},
+		{Name(""), `[3]`, "[\n\t3\n]"},
+		{Name(""), `[1,2,3]`, "[\n\t1,\n\t2,\n\t3\n]"},
+		{Name(""), `{"x":1}`, "{\n\t\"x\": 1\n}"},
+		{Name(""), `[true,false,null,"x",1,1.5,0,-5e+2]`, `[
 	true,
 	false,
 	null,
@@ -62,25 +70,40 @@ var ex1i = `[
 	1.5,
 	0,
 	-5e+2
-]`
-
-func TestCompact(t *testing.T) {
+]`},
+		{Name(""), "{\"\":\"<>&\u2028\u2029\"}", "{\n\t\"\": \"<>&\u2028\u2029\"\n}"}, // See golang.org/issue/34070
+	}
 	var buf bytes.Buffer
-	for _, tt := range examples {
-		buf.Reset()
-		if err := Compact(&buf, []byte(tt.compact)); err != nil {
-			t.Errorf("Compact(%#q): %v", tt.compact, err)
-		} else if s := buf.String(); s != tt.compact {
-			t.Errorf("Compact(%#q) = %#q, want original", tt.compact, s)
-		}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			buf.Reset()
+			if err := Compact(&buf, []byte(tt.compact)); err != nil {
+				t.Errorf("%s: Compact error: %v", tt.Where, err)
+			} else if got := buf.String(); got != tt.compact {
+				t.Errorf("%s: Compact:\n\tgot:  %s\n\twant: %s", tt.Where, indentNewlines(got), indentNewlines(tt.compact))
+			}
 
-		buf.Reset()
-		if err := Compact(&buf, []byte(tt.indent)); err != nil {
-			t.Errorf("Compact(%#q): %v", tt.indent, err)
-			continue
-		} else if s := buf.String(); s != tt.compact {
-			t.Errorf("Compact(%#q) = %#q, want %#q", tt.indent, s, tt.compact)
-		}
+			buf.Reset()
+			if err := Compact(&buf, []byte(tt.indent)); err != nil {
+				t.Errorf("%s: Compact error: %v", tt.Where, err)
+			} else if got := buf.String(); got != tt.compact {
+				t.Errorf("%s: Compact:\n\tgot:  %s\n\twant: %s", tt.Where, indentNewlines(got), indentNewlines(tt.compact))
+			}
+
+			buf.Reset()
+			if err := Indent(&buf, []byte(tt.indent), "", "\t"); err != nil {
+				t.Errorf("%s: Indent error: %v", tt.Where, err)
+			} else if got := buf.String(); got != tt.indent {
+				t.Errorf("%s: Compact:\n\tgot:  %s\n\twant: %s", tt.Where, indentNewlines(got), indentNewlines(tt.indent))
+			}
+
+			buf.Reset()
+			if err := Indent(&buf, []byte(tt.compact), "", "\t"); err != nil {
+				t.Errorf("%s: Indent error: %v", tt.Where, err)
+			} else if got := buf.String(); got != tt.indent {
+				t.Errorf("%s: Compact:\n\tgot:  %s\n\twant: %s", tt.Where, indentNewlines(got), indentNewlines(tt.indent))
+			}
+		})
 	}
 }
 
@@ -88,38 +111,21 @@ func TestCompactSeparators(t *testing.T) {
 	// U+2028 and U+2029 should be escaped inside strings.
 	// They should not appear outside strings.
 	tests := []struct {
+		CaseName
 		in, compact string
 	}{
-		{"{\"\u2028\": 1}", "{\"\u2028\":1}"},
-		{"{\"\u2029\" :2}", "{\"\u2029\":2}"},
+		{Name(""), "{\"\u2028\": 1}", "{\"\u2028\":1}"},
+		{Name(""), "{\"\u2029\" :2}", "{\"\u2029\":2}"},
 	}
 	for _, tt := range tests {
-		var buf bytes.Buffer
-		if err := Compact(&buf, []byte(tt.in)); err != nil {
-			t.Errorf("Compact(%q): %v", tt.in, err)
-		} else if s := buf.String(); s != tt.compact {
-			t.Errorf("Compact(%q) = %q, want %q", tt.in, s, tt.compact)
-		}
-	}
-}
-
-func TestIndent(t *testing.T) {
-	var buf bytes.Buffer
-	for _, tt := range examples {
-		buf.Reset()
-		if err := Indent(&buf, []byte(tt.indent), "", "\t"); err != nil {
-			t.Errorf("Indent(%#q): %v", tt.indent, err)
-		} else if s := buf.String(); s != tt.indent {
-			t.Errorf("Indent(%#q) = %#q, want original", tt.indent, s)
-		}
-
-		buf.Reset()
-		if err := Indent(&buf, []byte(tt.compact), "", "\t"); err != nil {
-			t.Errorf("Indent(%#q): %v", tt.compact, err)
-			continue
-		} else if s := buf.String(); s != tt.indent {
-			t.Errorf("Indent(%#q) = %#q, want %#q", tt.compact, s, tt.indent)
-		}
+		t.Run(tt.Name, func(t *testing.T) {
+			var buf bytes.Buffer
+			if err := Compact(&buf, []byte(tt.in)); err != nil {
+				t.Errorf("%s: Compact error: %v", tt.Where, err)
+			} else if got := buf.String(); got != tt.compact {
+				t.Errorf("%s: Compact:\n\tgot:  %s\n\twant: %s", tt.Where, indentNewlines(got), indentNewlines(tt.compact))
+			}
+		})
 	}
 }
 
@@ -129,11 +135,11 @@ func TestCompactBig(t *testing.T) {
 	initBig()
 	var buf bytes.Buffer
 	if err := Compact(&buf, jsonBig); err != nil {
-		t.Fatalf("Compact: %v", err)
+		t.Fatalf("Compact error: %v", err)
 	}
 	b := buf.Bytes()
 	if !bytes.Equal(b, jsonBig) {
-		t.Error("Compact(jsonBig) != jsonBig")
+		t.Error("Compact:")
 		diff(t, b, jsonBig)
 		return
 	}
@@ -144,23 +150,23 @@ func TestIndentBig(t *testing.T) {
 	initBig()
 	var buf bytes.Buffer
 	if err := Indent(&buf, jsonBig, "", "\t"); err != nil {
-		t.Fatalf("Indent1: %v", err)
+		t.Fatalf("Indent error: %v", err)
 	}
 	b := buf.Bytes()
 	if len(b) == len(jsonBig) {
 		// jsonBig is compact (no unnecessary spaces);
 		// indenting should make it bigger
-		t.Fatalf("Indent(jsonBig) did not get bigger")
+		t.Fatalf("Indent did not expand the input")
 	}
 
 	// should be idempotent
 	var buf1 bytes.Buffer
 	if err := Indent(&buf1, b, "", "\t"); err != nil {
-		t.Fatalf("Indent2: %v", err)
+		t.Fatalf("Indent error: %v", err)
 	}
 	b1 := buf1.Bytes()
 	if !bytes.Equal(b1, b) {
-		t.Error("Indent(Indent(jsonBig)) != Indent(jsonBig)")
+		t.Error("Indent(Indent(jsonBig)) != Indent(jsonBig):")
 		diff(t, b1, b)
 		return
 	}
@@ -168,40 +174,40 @@ func TestIndentBig(t *testing.T) {
 	// should get back to original
 	buf1.Reset()
 	if err := Compact(&buf1, b); err != nil {
-		t.Fatalf("Compact: %v", err)
+		t.Fatalf("Compact error: %v", err)
 	}
 	b1 = buf1.Bytes()
 	if !bytes.Equal(b1, jsonBig) {
-		t.Error("Compact(Indent(jsonBig)) != jsonBig")
+		t.Error("Compact(Indent(jsonBig)) != jsonBig:")
 		diff(t, b1, jsonBig)
 		return
 	}
 }
 
-type indentErrorTest struct {
-	in  string
-	err error
-}
-
-var indentErrorTests = []indentErrorTest{
-	{`{"X": "foo", "Y"}`, &SyntaxError{"invalid character '}' after object key", 17}},
-	{`{"X": "foo" "Y": "bar"}`, &SyntaxError{"invalid character '\"' after object key:value pair", 13}},
-}
-
 func TestIndentErrors(t *testing.T) {
-	for i, tt := range indentErrorTests {
-		slice := make([]uint8, 0)
-		buf := bytes.NewBuffer(slice)
-		if err := Indent(buf, []uint8(tt.in), "", ""); err != nil {
-			if !reflect.DeepEqual(err, tt.err) {
-				t.Errorf("#%d: Indent: %#v", i, err)
-				continue
+	tests := []struct {
+		CaseName
+		in  string
+		err error
+	}{
+		{Name(""), `{"X": "foo", "Y"}`, &SyntaxError{"invalid character '}' after object key", 17}},
+		{Name(""), `{"X": "foo" "Y": "bar"}`, &SyntaxError{"invalid character '\"' after object key:value pair", 13}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			slice := make([]uint8, 0)
+			buf := bytes.NewBuffer(slice)
+			if err := Indent(buf, []uint8(tt.in), "", ""); err != nil {
+				if !reflect.DeepEqual(err, tt.err) {
+					t.Fatalf("%s: Indent error:\n\tgot:  %v\n\twant: %v", tt.Where, err, tt.err)
+				}
 			}
-		}
+		})
 	}
 }
 
 func diff(t *testing.T, a, b []byte) {
+	t.Helper()
 	for i := 0; ; i++ {
 		if i >= len(a) || i >= len(b) || a[i] != b[i] {
 			j := i - 10
@@ -215,10 +221,7 @@ func diff(t *testing.T, a, b []byte) {
 }
 
 func trim(b []byte) []byte {
-	if len(b) > 20 {
-		return b[0:20]
-	}
-	return b
+	return b[:min(len(b), 20)]
 }
 
 // Generate a random JSON object.

gojson/stream.go

@@ -33,7 +33,7 @@ func NewDecoder(r io.Reader) *Decoder {
 }
 
 // UseNumber causes the Decoder to unmarshal a number into an interface{} as a
-// Number instead of as a float64.
+// [Number] instead of as a float64.
 func (dec *Decoder) UseNumber() { dec.d.useNumber = true }
 
 // DisallowUnknownFields causes the Decoder to return an error when the destination
@@ -41,10 +41,13 @@ func (dec *Decoder) UseNumber() { dec.d.useNumber = true }
 // non-ignored, exported fields in the destination.
 func (dec *Decoder) DisallowUnknownFields() { dec.d.disallowUnknownFields = true }
 
+// TagKey sets a different TagKey (instead of "json")
+func (dec *Decoder) TagKey(v string) { dec.d.tagkey = &v }
+
 // Decode reads the next JSON-encoded value from its
 // input and stores it in the value pointed to by v.
 //
-// See the documentation for Unmarshal for details about
+// See the documentation for [Unmarshal] for details about
 // the conversion of JSON into a Go value.
 func (dec *Decoder) Decode(v any) error {
 	if dec.err != nil {
@@ -79,7 +82,7 @@ func (dec *Decoder) Decode(v any) error {
 }
 
 // Buffered returns a reader of the data remaining in the Decoder's
-// buffer. The reader is valid until the next call to Decode.
+// buffer. The reader is valid until the next call to [Decoder.Decode].
 func (dec *Decoder) Buffered() io.Reader {
 	return bytes.NewReader(dec.buf[dec.scanp:])
 }
@@ -183,7 +186,7 @@ type Encoder struct {
 	err        error
 	escapeHTML bool
 
-	indentBuf    *bytes.Buffer
+	indentBuf    []byte
 	indentPrefix string
 	indentValue  string
 }
@@ -194,15 +197,19 @@ func NewEncoder(w io.Writer) *Encoder {
 }
 
 // Encode writes the JSON encoding of v to the stream,
+// with insignificant space characters elided,
 // followed by a newline character.
 //
-// See the documentation for Marshal for details about the
+// See the documentation for [Marshal] for details about the
 // conversion of Go values to JSON.
 func (enc *Encoder) Encode(v any) error {
 	if enc.err != nil {
 		return enc.err
 	}
+
 	e := newEncodeState()
+	defer encodeStatePool.Put(e)
+
 	err := e.marshal(v, encOpts{escapeHTML: enc.escapeHTML})
 	if err != nil {
 		return err
@@ -218,20 +225,15 @@ func (enc *Encoder) Encode(v any) error {
 
 	b := e.Bytes()
 	if enc.indentPrefix != "" || enc.indentValue != "" {
-		if enc.indentBuf == nil {
-			enc.indentBuf = new(bytes.Buffer)
-		}
-		enc.indentBuf.Reset()
-		err = Indent(enc.indentBuf, b, enc.indentPrefix, enc.indentValue)
+		enc.indentBuf, err = appendIndent(enc.indentBuf[:0], b, enc.indentPrefix, enc.indentValue)
 		if err != nil {
 			return err
 		}
-		b = enc.indentBuf.Bytes()
+		b = enc.indentBuf
 	}
 	if _, err = enc.w.Write(b); err != nil {
 		enc.err = err
 	}
-	encodeStatePool.Put(e)
 	return err
 }
 
@@ -255,7 +257,7 @@ func (enc *Encoder) SetEscapeHTML(on bool) {
 }
 
 // RawMessage is a raw encoded JSON value.
-// It implements Marshaler and Unmarshaler and can
+// It implements [Marshaler] and [Unmarshaler] and can
 // be used to delay JSON decoding or precompute a JSON encoding.
 type RawMessage []byte
 
@@ -281,12 +283,12 @@ var _ Unmarshaler = (*RawMessage)(nil)
 
 // A Token holds a value of one of these types:
 //
-//	Delim, for the four JSON delimiters [ ] { }
-//	bool, for JSON booleans
-//	float64, for JSON numbers
-//	Number, for JSON numbers
-//	string, for JSON string literals
-//	nil, for JSON null
+//   - [Delim], for the four JSON delimiters [ ] { }
+//   - bool, for JSON booleans
+//   - float64, for JSON numbers
+//   - [Number], for JSON numbers
+//   - string, for JSON string literals
+//   - nil, for JSON null
 type Token any
 
 const (
@@ -356,14 +358,14 @@ func (d Delim) String() string {
 }
 
 // Token returns the next JSON token in the input stream.
-// At the end of the input stream, Token returns nil, io.EOF.
+// At the end of the input stream, Token returns nil, [io.EOF].
 //
 // Token guarantees that the delimiters [ ] { } it returns are
 // properly nested and matched: if Token encounters an unexpected
 // delimiter in the input, it will return an error.
 //
 // The input stream consists of basic JSON values—bool, string,
-// number, and null—along with delimiters [ ] { } of type Delim
+// number, and null—along with delimiters [ ] { } of type [Delim]
 // to mark the start and end of arrays and objects.
 // Commas and colons are elided.
 func (dec *Decoder) Token() (Token, error) {

gojson/stream_test.go

@@ -6,16 +6,44 @@ package json
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"log"
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"path"
 	"reflect"
+	"runtime"
+	"runtime/debug"
 	"strings"
 	"testing"
 )
 
+// TODO(https://go.dev/issue/52751): Replace with native testing support.
+
+// CaseName is a case name annotated with a file and line.
+type CaseName struct {
+	Name  string
+	Where CasePos
+}
+
+// Name annotates a case name with the file and line of the caller.
+func Name(s string) (c CaseName) {
+	c.Name = s
+	runtime.Callers(2, c.Where.pc[:])
+	return c
+}
+
+// CasePos represents a file and line number.
+type CasePos struct{ pc [1]uintptr }
+
+func (pos CasePos) String() string {
+	frames := runtime.CallersFrames(pos.pc[:])
+	frame, _ := frames.Next()
+	return fmt.Sprintf("%s:%d", path.Base(frame.File), frame.Line)
+}
+
 // Test values for the stream test.
 // One of each JSON kind.
 var streamTest = []any{
@@ -41,24 +69,61 @@ false
 
 func TestEncoder(t *testing.T) {
 	for i := 0; i <= len(streamTest); i++ {
-		var buf bytes.Buffer
+		var buf strings.Builder
 		enc := NewEncoder(&buf)
 		// Check that enc.SetIndent("", "") turns off indentation.
 		enc.SetIndent(">", ".")
 		enc.SetIndent("", "")
 		for j, v := range streamTest[0:i] {
 			if err := enc.Encode(v); err != nil {
-				t.Fatalf("encode #%d: %v", j, err)
+				t.Fatalf("#%d.%d Encode error: %v", i, j, err)
 			}
 		}
 		if have, want := buf.String(), nlines(streamEncoded, i); have != want {
-			t.Errorf("encoding %d items: mismatch", i)
+			t.Errorf("encoding %d items: mismatch:", i)
 			diff(t, []byte(have), []byte(want))
 			break
 		}
 	}
 }
 
+func TestEncoderErrorAndReuseEncodeState(t *testing.T) {
+	// Disable the GC temporarily to prevent encodeState's in Pool being cleaned away during the test.
+	percent := debug.SetGCPercent(-1)
+	defer debug.SetGCPercent(percent)
+
+	// Trigger an error in Marshal with cyclic data.
+	type Dummy struct {
+		Name string
+		Next *Dummy
+	}
+	dummy := Dummy{Name: "Dummy"}
+	dummy.Next = &dummy
+
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	if err := enc.Encode(dummy); err == nil {
+		t.Errorf("Encode(dummy) error: got nil, want non-nil")
+	}
+
+	type Data struct {
+		A string
+		I int
+	}
+	want := Data{A: "a", I: 1}
+	if err := enc.Encode(want); err != nil {
+		t.Errorf("Marshal error: %v", err)
+	}
+
+	var got Data
+	if err := Unmarshal(buf.Bytes(), &got); err != nil {
+		t.Errorf("Unmarshal error: %v", err)
+	}
+	if got != want {
+		t.Errorf("Marshal/Unmarshal roundtrip:\n\tgot:  %v\n\twant: %v", got, want)
+	}
+}
+
 var streamEncodedIndent = `0.1
 "hello"
 null
@@ -77,14 +142,14 @@ false
 `
 
 func TestEncoderIndent(t *testing.T) {
-	var buf bytes.Buffer
+	var buf strings.Builder
 	enc := NewEncoder(&buf)
 	enc.SetIndent(">", ".")
 	for _, v := range streamTest {
 		enc.Encode(v)
 	}
 	if have, want := buf.String(), streamEncodedIndent; have != want {
-		t.Error("indented encoding mismatch")
+		t.Error("Encode mismatch:")
 		diff(t, []byte(have), []byte(want))
 	}
 }
@@ -122,50 +187,51 @@ func TestEncoderSetEscapeHTML(t *testing.T) {
 		Bar string `json:"bar,string"`
 	}{`<html>foobar</html>`}
 
-	for _, tt := range []struct {
-		name       string
+	tests := []struct {
+		CaseName
 		v          any
 		wantEscape string
 		want       string
 	}{
-		{"c", c, `"\u003c\u0026\u003e"`, `"<&>"`},
-		{"ct", ct, `"\"\u003c\u0026\u003e\""`, `"\"<&>\""`},
-		{`"<&>"`, "<&>", `"\u003c\u0026\u003e"`, `"<&>"`},
+		{Name("c"), c, `"\u003c\u0026\u003e"`, `"<&>"`},
+		{Name("ct"), ct, `"\"\u003c\u0026\u003e\""`, `"\"<&>\""`},
+		{Name(`"<&>"`), "<&>", `"\u003c\u0026\u003e"`, `"<&>"`},
 		{
-			"tagStruct", tagStruct,
+			Name("tagStruct"), tagStruct,
 			`{"\u003c\u003e\u0026#! ":0,"Invalid":0}`,
 			`{"<>&#! ":0,"Invalid":0}`,
 		},
 		{
-			`"<str>"`, marshalerStruct,
+			Name(`"<str>"`), marshalerStruct,
 			`{"NonPtr":"\u003cstr\u003e","Ptr":"\u003cstr\u003e"}`,
 			`{"NonPtr":"<str>","Ptr":"<str>"}`,
 		},
 		{
-			"stringOption", stringOption,
+			Name("stringOption"), stringOption,
 			`{"bar":"\"\\u003chtml\\u003efoobar\\u003c/html\\u003e\""}`,
 			`{"bar":"\"<html>foobar</html>\""}`,
 		},
-	} {
-		var buf bytes.Buffer
-		enc := NewEncoder(&buf)
-		if err := enc.Encode(tt.v); err != nil {
-			t.Errorf("Encode(%s): %s", tt.name, err)
-			continue
-		}
-		if got := strings.TrimSpace(buf.String()); got != tt.wantEscape {
-			t.Errorf("Encode(%s) = %#q, want %#q", tt.name, got, tt.wantEscape)
-		}
-		buf.Reset()
-		enc.SetEscapeHTML(false)
-		if err := enc.Encode(tt.v); err != nil {
-			t.Errorf("SetEscapeHTML(false) Encode(%s): %s", tt.name, err)
-			continue
-		}
-		if got := strings.TrimSpace(buf.String()); got != tt.want {
-			t.Errorf("SetEscapeHTML(false) Encode(%s) = %#q, want %#q",
-				tt.name, got, tt.want)
-		}
+	}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			var buf strings.Builder
+			enc := NewEncoder(&buf)
+			if err := enc.Encode(tt.v); err != nil {
+				t.Fatalf("%s: Encode(%s) error: %s", tt.Where, tt.Name, err)
+			}
+			if got := strings.TrimSpace(buf.String()); got != tt.wantEscape {
+				t.Errorf("%s: Encode(%s):\n\tgot:  %s\n\twant: %s", tt.Where, tt.Name, got, tt.wantEscape)
+			}
+			buf.Reset()
+			enc.SetEscapeHTML(false)
+			if err := enc.Encode(tt.v); err != nil {
+				t.Fatalf("%s: SetEscapeHTML(false) Encode(%s) error: %s", tt.Where, tt.Name, err)
+			}
+			if got := strings.TrimSpace(buf.String()); got != tt.want {
+				t.Errorf("%s: SetEscapeHTML(false) Encode(%s):\n\tgot:  %s\n\twant: %s",
+					tt.Where, tt.Name, got, tt.want)
+			}
+		})
 	}
 }
 
@@ -186,14 +252,14 @@ func TestDecoder(t *testing.T) {
 		dec := NewDecoder(&buf)
 		for j := range out {
 			if err := dec.Decode(&out[j]); err != nil {
-				t.Fatalf("decode #%d/%d: %v", j, i, err)
+				t.Fatalf("decode #%d/%d error: %v", j, i, err)
 			}
 		}
 		if !reflect.DeepEqual(out, streamTest[0:i]) {
-			t.Errorf("decoding %d items: mismatch", i)
+			t.Errorf("decoding %d items: mismatch:", i)
 			for j := range out {
 				if !reflect.DeepEqual(out[j], streamTest[j]) {
-					t.Errorf("#%d: have %v want %v", j, out[j], streamTest[j])
+					t.Errorf("#%d:\n\tgot:  %v\n\twant: %v", j, out[j], streamTest[j])
 				}
 			}
 			break
@@ -212,14 +278,14 @@ func TestDecoderBuffered(t *testing.T) {
 		t.Fatal(err)
 	}
 	if m.Name != "Gopher" {
-		t.Errorf("Name = %q; want Gopher", m.Name)
+		t.Errorf("Name = %s, want Gopher", m.Name)
 	}
 	rest, err := io.ReadAll(d.Buffered())
 	if err != nil {
 		t.Fatal(err)
 	}
-	if g, w := string(rest), " extra "; g != w {
-		t.Errorf("Remaining = %q; want %q", g, w)
+	if got, want := string(rest), " extra "; got != want {
+		t.Errorf("Remaining = %s, want %s", got, want)
 	}
 }
 
@@ -244,20 +310,20 @@ func TestRawMessage(t *testing.T) {
 		Y  float32
 	}
 	const raw = `["\u0056",null]`
-	const msg = `{"X":0.1,"Id":["\u0056",null],"Y":0.2}`
-	err := Unmarshal([]byte(msg), &data)
+	const want = `{"X":0.1,"Id":["\u0056",null],"Y":0.2}`
+	err := Unmarshal([]byte(want), &data)
 	if err != nil {
-		t.Fatalf("Unmarshal: %v", err)
+		t.Fatalf("Unmarshal error: %v", err)
 	}
 	if string([]byte(data.Id)) != raw {
-		t.Fatalf("Raw mismatch: have %#q want %#q", []byte(data.Id), raw)
+		t.Fatalf("Unmarshal:\n\tgot:  %s\n\twant: %s", []byte(data.Id), raw)
 	}
-	b, err := Marshal(&data)
+	got, err := Marshal(&data)
 	if err != nil {
-		t.Fatalf("Marshal: %v", err)
+		t.Fatalf("Marshal error: %v", err)
 	}
-	if string(b) != msg {
-		t.Fatalf("Marshal: have %#q want %#q", b, msg)
+	if string(got) != want {
+		t.Fatalf("Marshal:\n\tgot:  %s\n\twant: %s", got, want)
 	}
 }
 
@@ -268,174 +334,156 @@ func TestNullRawMessage(t *testing.T) {
 		IdPtr *RawMessage
 		Y     float32
 	}
-	const msg = `{"X":0.1,"Id":null,"IdPtr":null,"Y":0.2}`
-	err := Unmarshal([]byte(msg), &data)
+	const want = `{"X":0.1,"Id":null,"IdPtr":null,"Y":0.2}`
+	err := Unmarshal([]byte(want), &data)
 	if err != nil {
-		t.Fatalf("Unmarshal: %v", err)
+		t.Fatalf("Unmarshal error: %v", err)
 	}
 	if want, got := "null", string(data.Id); want != got {
-		t.Fatalf("Raw mismatch: have %q, want %q", got, want)
+		t.Fatalf("Unmarshal:\n\tgot:  %s\n\twant: %s", got, want)
 	}
 	if data.IdPtr != nil {
-		t.Fatalf("Raw pointer mismatch: have non-nil, want nil")
+		t.Fatalf("pointer mismatch: got non-nil, want nil")
 	}
-	b, err := Marshal(&data)
+	got, err := Marshal(&data)
 	if err != nil {
-		t.Fatalf("Marshal: %v", err)
+		t.Fatalf("Marshal error: %v", err)
 	}
-	if string(b) != msg {
-		t.Fatalf("Marshal: have %#q want %#q", b, msg)
+	if string(got) != want {
+		t.Fatalf("Marshal:\n\tgot:  %s\n\twant: %s", got, want)
 	}
 }
 
-var blockingTests = []string{
-	`{"x": 1}`,
-	`[1, 2, 3]`,
-}
-
 func TestBlocking(t *testing.T) {
-	for _, enc := range blockingTests {
-		r, w := net.Pipe()
-		go w.Write([]byte(enc))
-		var val any
-
-		// If Decode reads beyond what w.Write writes above,
-		// it will block, and the test will deadlock.
-		if err := NewDecoder(r).Decode(&val); err != nil {
-			t.Errorf("decoding %s: %v", enc, err)
-		}
-		r.Close()
-		w.Close()
+	tests := []struct {
+		CaseName
+		in string
+	}{
+		{Name(""), `{"x": 1}`},
+		{Name(""), `[1, 2, 3]`},
 	}
-}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			r, w := net.Pipe()
+			go w.Write([]byte(tt.in))
+			var val any
 
-func BenchmarkEncoderEncode(b *testing.B) {
-	b.ReportAllocs()
-	type T struct {
-		X, Y string
-	}
-	v := &T{"foo", "bar"}
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			if err := NewEncoder(io.Discard).Encode(v); err != nil {
-				b.Fatal(err)
+			// If Decode reads beyond what w.Write writes above,
+			// it will block, and the test will deadlock.
+			if err := NewDecoder(r).Decode(&val); err != nil {
+				t.Errorf("%s: NewDecoder(%s).Decode error: %v", tt.Where, tt.in, err)
 			}
-		}
-	})
-}
-
-type tokenStreamCase struct {
-	json      string
-	expTokens []any
+			r.Close()
+			w.Close()
+		})
+	}
 }
 
 type decodeThis struct {
 	v any
 }
 
-var tokenStreamCases = []tokenStreamCase{
-	// streaming token cases
-	{json: `10`, expTokens: []any{float64(10)}},
-	{json: ` [10] `, expTokens: []any{
-		Delim('['), float64(10), Delim(']')}},
-	{json: ` [false,10,"b"] `, expTokens: []any{
-		Delim('['), false, float64(10), "b", Delim(']')}},
-	{json: `{ "a": 1 }`, expTokens: []any{
-		Delim('{'), "a", float64(1), Delim('}')}},
-	{json: `{"a": 1, "b":"3"}`, expTokens: []any{
-		Delim('{'), "a", float64(1), "b", "3", Delim('}')}},
-	{json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
-		Delim('['),
-		Delim('{'), "a", float64(1), Delim('}'),
-		Delim('{'), "a", float64(2), Delim('}'),
-		Delim(']')}},
-	{json: `{"obj": {"a": 1}}`, expTokens: []any{
-		Delim('{'), "obj", Delim('{'), "a", float64(1), Delim('}'),
-		Delim('}')}},
-	{json: `{"obj": [{"a": 1}]}`, expTokens: []any{
-		Delim('{'), "obj", Delim('['),
-		Delim('{'), "a", float64(1), Delim('}'),
-		Delim(']'), Delim('}')}},
-
-	// streaming tokens with intermittent Decode()
-	{json: `{ "a": 1 }`, expTokens: []any{
-		Delim('{'), "a",
-		decodeThis{float64(1)},
-		Delim('}')}},
-	{json: ` [ { "a" : 1 } ] `, expTokens: []any{
-		Delim('['),
-		decodeThis{map[string]any{"a": float64(1)}},
-		Delim(']')}},
-	{json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
-		Delim('['),
-		decodeThis{map[string]any{"a": float64(1)}},
-		decodeThis{map[string]any{"a": float64(2)}},
-		Delim(']')}},
-	{json: `{ "obj" : [ { "a" : 1 } ] }`, expTokens: []any{
-		Delim('{'), "obj", Delim('['),
-		decodeThis{map[string]any{"a": float64(1)}},
-		Delim(']'), Delim('}')}},
-
-	{json: `{"obj": {"a": 1}}`, expTokens: []any{
-		Delim('{'), "obj",
-		decodeThis{map[string]any{"a": float64(1)}},
-		Delim('}')}},
-	{json: `{"obj": [{"a": 1}]}`, expTokens: []any{
-		Delim('{'), "obj",
-		decodeThis{[]any{
-			map[string]any{"a": float64(1)},
-		}},
-		Delim('}')}},
-	{json: ` [{"a": 1} {"a": 2}] `, expTokens: []any{
-		Delim('['),
-		decodeThis{map[string]any{"a": float64(1)}},
-		decodeThis{&SyntaxError{"expected comma after array element", 11}},
-	}},
-	{json: `{ "` + strings.Repeat("a", 513) + `" 1 }`, expTokens: []any{
-		Delim('{'), strings.Repeat("a", 513),
-		decodeThis{&SyntaxError{"expected colon after object key", 518}},
-	}},
-	{json: `{ "\a" }`, expTokens: []any{
-		Delim('{'),
-		&SyntaxError{"invalid character 'a' in string escape code", 3},
-	}},
-	{json: ` \a`, expTokens: []any{
-		&SyntaxError{"invalid character '\\\\' looking for beginning of value", 1},
-	}},
-}
-
 func TestDecodeInStream(t *testing.T) {
-	for ci, tcase := range tokenStreamCases {
+	tests := []struct {
+		CaseName
+		json      string
+		expTokens []any
+	}{
+		// streaming token cases
+		{CaseName: Name(""), json: `10`, expTokens: []any{float64(10)}},
+		{CaseName: Name(""), json: ` [10] `, expTokens: []any{
+			Delim('['), float64(10), Delim(']')}},
+		{CaseName: Name(""), json: ` [false,10,"b"] `, expTokens: []any{
+			Delim('['), false, float64(10), "b", Delim(']')}},
+		{CaseName: Name(""), json: `{ "a": 1 }`, expTokens: []any{
+			Delim('{'), "a", float64(1), Delim('}')}},
+		{CaseName: Name(""), json: `{"a": 1, "b":"3"}`, expTokens: []any{
+			Delim('{'), "a", float64(1), "b", "3", Delim('}')}},
+		{CaseName: Name(""), json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
+			Delim('['),
+			Delim('{'), "a", float64(1), Delim('}'),
+			Delim('{'), "a", float64(2), Delim('}'),
+			Delim(']')}},
+		{CaseName: Name(""), json: `{"obj": {"a": 1}}`, expTokens: []any{
+			Delim('{'), "obj", Delim('{'), "a", float64(1), Delim('}'),
+			Delim('}')}},
+		{CaseName: Name(""), json: `{"obj": [{"a": 1}]}`, expTokens: []any{
+			Delim('{'), "obj", Delim('['),
+			Delim('{'), "a", float64(1), Delim('}'),
+			Delim(']'), Delim('}')}},
 
-		dec := NewDecoder(strings.NewReader(tcase.json))
-		for i, etk := range tcase.expTokens {
+		// streaming tokens with intermittent Decode()
+		{CaseName: Name(""), json: `{ "a": 1 }`, expTokens: []any{
+			Delim('{'), "a",
+			decodeThis{float64(1)},
+			Delim('}')}},
+		{CaseName: Name(""), json: ` [ { "a" : 1 } ] `, expTokens: []any{
+			Delim('['),
+			decodeThis{map[string]any{"a": float64(1)}},
+			Delim(']')}},
+		{CaseName: Name(""), json: ` [{"a": 1},{"a": 2}] `, expTokens: []any{
+			Delim('['),
+			decodeThis{map[string]any{"a": float64(1)}},
+			decodeThis{map[string]any{"a": float64(2)}},
+			Delim(']')}},
+		{CaseName: Name(""), json: `{ "obj" : [ { "a" : 1 } ] }`, expTokens: []any{
+			Delim('{'), "obj", Delim('['),
+			decodeThis{map[string]any{"a": float64(1)}},
+			Delim(']'), Delim('}')}},
 
-			var tk any
-			var err error
+		{CaseName: Name(""), json: `{"obj": {"a": 1}}`, expTokens: []any{
+			Delim('{'), "obj",
+			decodeThis{map[string]any{"a": float64(1)}},
+			Delim('}')}},
+		{CaseName: Name(""), json: `{"obj": [{"a": 1}]}`, expTokens: []any{
+			Delim('{'), "obj",
+			decodeThis{[]any{
+				map[string]any{"a": float64(1)},
+			}},
+			Delim('}')}},
+		{CaseName: Name(""), json: ` [{"a": 1} {"a": 2}] `, expTokens: []any{
+			Delim('['),
+			decodeThis{map[string]any{"a": float64(1)}},
+			decodeThis{&SyntaxError{"expected comma after array element", 11}},
+		}},
+		{CaseName: Name(""), json: `{ "` + strings.Repeat("a", 513) + `" 1 }`, expTokens: []any{
+			Delim('{'), strings.Repeat("a", 513),
+			decodeThis{&SyntaxError{"expected colon after object key", 518}},
+		}},
+		{CaseName: Name(""), json: `{ "\a" }`, expTokens: []any{
+			Delim('{'),
+			&SyntaxError{"invalid character 'a' in string escape code", 3},
+		}},
+		{CaseName: Name(""), json: ` \a`, expTokens: []any{
+			&SyntaxError{"invalid character '\\\\' looking for beginning of value", 1},
+		}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			dec := NewDecoder(strings.NewReader(tt.json))
+			for i, want := range tt.expTokens {
+				var got any
+				var err error
 
-			if dt, ok := etk.(decodeThis); ok {
-				etk = dt.v
-				err = dec.Decode(&tk)
-			} else {
-				tk, err = dec.Token()
-			}
-			if experr, ok := etk.(error); ok {
-				if err == nil || !reflect.DeepEqual(err, experr) {
-					t.Errorf("case %v: Expected error %#v in %q, but was %#v", ci, experr, tcase.json, err)
+				if dt, ok := want.(decodeThis); ok {
+					want = dt.v
+					err = dec.Decode(&got)
+				} else {
+					got, err = dec.Token()
+				}
+				if errWant, ok := want.(error); ok {
+					if err == nil || !reflect.DeepEqual(err, errWant) {
+						t.Fatalf("%s:\n\tinput: %s\n\tgot error:  %v\n\twant error: %v", tt.Where, tt.json, err, errWant)
+					}
+					break
+				} else if err != nil {
+					t.Fatalf("%s:\n\tinput: %s\n\tgot error:  %v\n\twant error: nil", tt.Where, tt.json, err)
+				}
+				if !reflect.DeepEqual(got, want) {
+					t.Fatalf("%s: token %d:\n\tinput: %s\n\tgot:  %T(%v)\n\twant: %T(%v)", tt.Where, i, tt.json, got, got, want, want)
 				}
-				break
-			} else if err == io.EOF {
-				t.Errorf("case %v: Unexpected EOF in %q", ci, tcase.json)
-				break
-			} else if err != nil {
-				t.Errorf("case %v: Unexpected error '%#v' in %q", ci, err, tcase.json)
-				break
 			}
-			if !reflect.DeepEqual(tk, etk) {
-				t.Errorf(`case %v: %q @ %v expected %T(%v) was %T(%v)`, ci, tcase.json, i, etk, etk, tk, tk)
-				break
-			}
-		}
+		})
 	}
 }
 
@@ -449,7 +497,7 @@ func TestHTTPDecoding(t *testing.T) {
 	defer ts.Close()
 	res, err := http.Get(ts.URL)
 	if err != nil {
-		log.Fatalf("GET failed: %v", err)
+		log.Fatalf("http.Get error: %v", err)
 	}
 	defer res.Body.Close()
 
@@ -460,15 +508,15 @@ func TestHTTPDecoding(t *testing.T) {
 	d := NewDecoder(res.Body)
 	err = d.Decode(&foo)
 	if err != nil {
-		t.Fatalf("Decode: %v", err)
+		t.Fatalf("Decode error: %v", err)
 	}
 	if foo.Foo != "bar" {
-		t.Errorf("decoded %q; want \"bar\"", foo.Foo)
+		t.Errorf(`Decode: got %q, want "bar"`, foo.Foo)
 	}
 
 	// make sure we get the EOF the second time
 	err = d.Decode(&foo)
 	if err != io.EOF {
-		t.Errorf("err = %v; want io.EOF", err)
+		t.Errorf("Decode error:\n\tgot:  %v\n\twant: io.EOF", err)
 	}
 }

gojson/tagkey_test.go

@@ -72,49 +72,50 @@ type unicodeTag struct {
 	W string `json:"Ελλάδα"`
 }
 
-var structTagObjectKeyTests = []struct {
-	raw   any
-	value string
-	key   string
-}{
-	{basicLatin2xTag{"2x"}, "2x", "$%-/"},
-	{basicLatin3xTag{"3x"}, "3x", "0123456789"},
-	{basicLatin4xTag{"4x"}, "4x", "ABCDEFGHIJKLMO"},
-	{basicLatin5xTag{"5x"}, "5x", "PQRSTUVWXYZ_"},
-	{basicLatin6xTag{"6x"}, "6x", "abcdefghijklmno"},
-	{basicLatin7xTag{"7x"}, "7x", "pqrstuvwxyz"},
-	{miscPlaneTag{"いろはにほへと"}, "いろはにほへと", "色は匂へど"},
-	{dashTag{"foo"}, "foo", "-"},
-	{emptyTag{"Pour Moi"}, "Pour Moi", "W"},
-	{misnamedTag{"Animal Kingdom"}, "Animal Kingdom", "X"},
-	{badFormatTag{"Orfevre"}, "Orfevre", "Y"},
-	{badCodeTag{"Reliable Man"}, "Reliable Man", "Z"},
-	{percentSlashTag{"brut"}, "brut", "text/html%"},
-	{punctuationTag{"Union Rags"}, "Union Rags", "!#$%&()*+-./:;<=>?@[]^_{|}~ "},
-	{spaceTag{"Perreddu"}, "Perreddu", "With space"},
-	{unicodeTag{"Loukanikos"}, "Loukanikos", "Ελλάδα"},
-}
-
 func TestStructTagObjectKey(t *testing.T) {
-	for _, tt := range structTagObjectKeyTests {
-		b, err := Marshal(tt.raw)
-		if err != nil {
-			t.Fatalf("Marshal(%#q) failed: %v", tt.raw, err)
-		}
-		var f any
-		err = Unmarshal(b, &f)
-		if err != nil {
-			t.Fatalf("Unmarshal(%#q) failed: %v", b, err)
-		}
-		for i, v := range f.(map[string]any) {
-			switch i {
-			case tt.key:
-				if s, ok := v.(string); !ok || s != tt.value {
-					t.Fatalf("Unexpected value: %#q, want %v", s, tt.value)
-				}
-			default:
-				t.Fatalf("Unexpected key: %#q, from %#q", i, b)
+	tests := []struct {
+		CaseName
+		raw   any
+		value string
+		key   string
+	}{
+		{Name(""), basicLatin2xTag{"2x"}, "2x", "$%-/"},
+		{Name(""), basicLatin3xTag{"3x"}, "3x", "0123456789"},
+		{Name(""), basicLatin4xTag{"4x"}, "4x", "ABCDEFGHIJKLMO"},
+		{Name(""), basicLatin5xTag{"5x"}, "5x", "PQRSTUVWXYZ_"},
+		{Name(""), basicLatin6xTag{"6x"}, "6x", "abcdefghijklmno"},
+		{Name(""), basicLatin7xTag{"7x"}, "7x", "pqrstuvwxyz"},
+		{Name(""), miscPlaneTag{"いろはにほへと"}, "いろはにほへと", "色は匂へど"},
+		{Name(""), dashTag{"foo"}, "foo", "-"},
+		{Name(""), emptyTag{"Pour Moi"}, "Pour Moi", "W"},
+		{Name(""), misnamedTag{"Animal Kingdom"}, "Animal Kingdom", "X"},
+		{Name(""), badFormatTag{"Orfevre"}, "Orfevre", "Y"},
+		{Name(""), badCodeTag{"Reliable Man"}, "Reliable Man", "Z"},
+		{Name(""), percentSlashTag{"brut"}, "brut", "text/html%"},
+		{Name(""), punctuationTag{"Union Rags"}, "Union Rags", "!#$%&()*+-./:;<=>?@[]^_{|}~ "},
+		{Name(""), spaceTag{"Perreddu"}, "Perreddu", "With space"},
+		{Name(""), unicodeTag{"Loukanikos"}, "Loukanikos", "Ελλάδα"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.Name, func(t *testing.T) {
+			b, err := Marshal(tt.raw)
+			if err != nil {
+				t.Fatalf("%s: Marshal error: %v", tt.Where, err)
 			}
-		}
+			var f any
+			err = Unmarshal(b, &f)
+			if err != nil {
+				t.Fatalf("%s: Unmarshal error: %v", tt.Where, err)
+			}
+			for k, v := range f.(map[string]any) {
+				if k == tt.key {
+					if s, ok := v.(string); !ok || s != tt.value {
+						t.Fatalf("%s: Unmarshal(%#q) value:\n\tgot:  %q\n\twant: %q", tt.Where, b, s, tt.value)
+					}
+				} else {
+					t.Fatalf("%s: Unmarshal(%#q): unexpected key: %q", tt.Where, b, k)
+				}
+			}
+		})
 	}
 }

gojson/tags_test.go

@@ -22,7 +22,7 @@ func TestTagParsing(t *testing.T) {
 		{"bar", false},
 	} {
 		if opts.Contains(tt.opt) != tt.want {
-			t.Errorf("Contains(%q) = %v", tt.opt, !tt.want)
+			t.Errorf("Contains(%q) = %v, want %v", tt.opt, !tt.want, tt.want)
 		}
 	}
 }

googleapi/README.md

@@ -0,0 +1,54 @@
+
+Google OAuth Setup (to send mails)
+==================================
+
+
+ - Login @ https://console.cloud.google.com
+
+ - GMail API akivieren: https://console.cloud.google.com/apis/library/gmail.googleapis.com?
+
+ - Create new Project (aka 'BackendMailAPI') @ https://console.cloud.google.com/projectcreate
+   User Type: Intern
+   Anwendungsname: 'BackendMailAPI'
+   Support-Email: ...
+   Authorisierte Domains: 'heydyno.de' (or project domain)
+   Kontakt-Email: ...
+   
+
+ - Unter "Anmeldedaten" neuer OAuth Client erstellen @ https://console.cloud.google.com/apis/credentials
+   Anwendungstyp: Web
+   Name: 'BackendMailOAuth'
+   Redirect-Uri: 'http://localhost/oauth'
+   Client-ID und Client-Key merken
+
+ - Open in Browser:
+   https://accounts.google.com/o/oauth2/v2/auth?redirect_uri=http://localhost/oauth&prompt=consent&response_type=code&client_id={...}&scope=https://www.googleapis.com/auth/gmail.send&access_type=offline
+   Code aus redirected URI merken
+
+ - Code via request einlösen (und refresh_roken merken):
+
+```
+curl --request POST \
+  --url https://oauth2.googleapis.com/token \
+  --data code={...} \
+  --data redirect_uri=http://localhost/oauth \
+  --data client_id={...} \
+  --data client_secret={...} \
+  --data grant_type=authorization_code \
+  --data scope=https://www.googleapis.com/auth/gmail.send
+```
+
+ - Fertig, mit `client_id`, `client_secret` und `refresh_token` kann das package benutzt werden
+
+
+
+
+
+
+
+
+
+
+
+
+

googleapi/attachment.go

@@ -0,0 +1,46 @@
+package googleapi
+
+import (
+	"encoding/base64"
+	"fmt"
+)
+
+type MailAttachment struct {
+	IsInline    bool
+	ContentType string
+	Filename    string
+	Data        []byte
+}
+
+func (a MailAttachment) dump() []string {
+	res := make([]string, 0, 4)
+
+	if a.ContentType != "" {
+		res = append(res, "Content-Type: "+a.ContentType+"; charset=UTF-8")
+	}
+
+	res = append(res, "Content-Transfer-Encoding: base64")
+
+	if a.IsInline {
+		if a.Filename != "" {
+			res = append(res, fmt.Sprintf("Content-Disposition: inline;filename=\"%s\"", a.Filename))
+		} else {
+			res = append(res, "Content-Disposition: inline")
+		}
+	} else {
+		if a.Filename != "" {
+			res = append(res, fmt.Sprintf("Content-Disposition: attachment;filename=\"%s\"", a.Filename))
+		} else {
+			res = append(res, "Content-Disposition: attachment")
+		}
+	}
+
+	b64 := base64.StdEncoding.EncodeToString(a.Data)
+	for i := 0; i < len(b64); i += 80 {
+		res = append(res, b64[i:min(i+80, len(b64))])
+	}
+
+	res = append(res)
+
+	return res
+}

googleapi/body.go

@@ -0,0 +1,6 @@
+package googleapi
+
+type MailBody struct {
+	Plain string
+	HTML  string
+}

googleapi/mimeMessage.go

@@ -0,0 +1,224 @@
+package googleapi
+
+import (
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"mime"
+	"strings"
+	"time"
+)
+
+// https://datatracker.ietf.org/doc/html/rfc2822
+func encodeMimeMail(from string, recipients []string, cc []string, bcc []string, subject string, body MailBody, attachments []MailAttachment) string {
+
+	data := make([]string, 0, 32)
+
+	data = append(data, "Date: "+time.Now().Format(time.RFC1123Z))
+	data = append(data, "MIME-Version: 1.0")
+	data = append(data, "From: "+mime.QEncoding.Encode("UTF-8", from))
+	data = append(data, "To: "+strings.Join(langext.ArrMap(recipients, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	if len(cc) > 0 {
+		data = append(data, "To: "+strings.Join(langext.ArrMap(cc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	}
+	if len(bcc) > 0 {
+		data = append(data, "Bcc: "+strings.Join(langext.ArrMap(bcc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	}
+	data = append(data, "Subject: "+mime.QEncoding.Encode("UTF-8", subject))
+
+	hasInlineAttachments := langext.ArrAny(attachments, func(v MailAttachment) bool { return v.IsInline })
+	hasNormalAttachments := langext.ArrAny(attachments, func(v MailAttachment) bool { return !v.IsInline })
+	hasPlain := body.Plain != ""
+	hasHTML := body.HTML != ""
+
+	mixedBoundary := langext.MustRawHexUUID()
+	relatedBoundary := langext.MustRawHexUUID()
+	altBoundary := langext.MustRawHexUUID()
+
+	inlineAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return v.IsInline })
+	normalAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return !v.IsInline })
+
+	if hasInlineAttachments && hasNormalAttachments {
+		// "mixed+related"
+
+		data = append(data, "Content-Type: multipart/mixed; boundary="+mixedBoundary)
+		data = append(data, "")
+		data = append(data, "--"+mixedBoundary)
+
+		data = append(data, "Content-Type: multipart/related; boundary="+relatedBoundary)
+		data = append(data, "")
+
+		data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, relatedBoundary, altBoundary)...)
+		data = append(data, "")
+
+		for i, attachment := range inlineAttachments {
+			data = append(data, "--"+relatedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(inlineAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, "--"+relatedBoundary+"--")
+
+		for i, attachment := range normalAttachments {
+			data = append(data, "--"+mixedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(normalAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, "--"+mixedBoundary+"--")
+
+	} else if hasNormalAttachments {
+		// "mixed"
+
+		data = append(data, "Content-Type: multipart/mixed; boundary="+mixedBoundary)
+		data = append(data, "")
+
+		data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, mixedBoundary, altBoundary)...)
+		if hasPlain && hasHTML {
+			data = append(data, "")
+		}
+
+		for i, attachment := range normalAttachments {
+			data = append(data, "--"+mixedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(normalAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, "--"+mixedBoundary+"--")
+
+	} else if hasInlineAttachments {
+		// "related"
+
+		data = append(data, "Content-Type: multipart/related; boundary="+relatedBoundary)
+		data = append(data, "")
+
+		data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, relatedBoundary, altBoundary)...)
+		data = append(data, "")
+
+		for i, attachment := range inlineAttachments {
+			data = append(data, "--"+relatedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(inlineAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, "--"+relatedBoundary+"--")
+
+	} else if hasPlain && hasHTML {
+		// "alternative"
+
+		data = append(data, "Content-Type: multipart/alternative; boundary="+altBoundary)
+		data = append(data, "")
+
+		data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, altBoundary, altBoundary)...)
+		data = append(data, "")
+
+		data = append(data, "--"+altBoundary+"--")
+
+	} else if hasPlain {
+		// "plain"
+
+		data = append(data, "Content-Type: text/plain; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.Plain)
+
+	} else if hasHTML {
+		// "plain"
+
+		data = append(data, "Content-Type: text/html; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.HTML)
+
+	} else {
+		// "empty??"
+
+	}
+
+	return strings.Join(data, "\r\n")
+}
+
+func dumpMailBody(body MailBody, hasInlineAttachments bool, hasNormalAttachments bool, boundary string, boundaryAlt string) []string {
+
+	if body.HTML != "" && body.Plain != "" && !hasInlineAttachments && hasNormalAttachments {
+		data := make([]string, 0, 16)
+		data = append(data, "--"+boundary)
+		data = append(data, "Content-Type: multipart/alternative; boundary="+boundaryAlt)
+		data = append(data, "")
+		data = append(data, "--"+boundaryAlt)
+		data = append(data, "Content-Type: text/plain; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.Plain)
+		data = append(data, "")
+		data = append(data, "--"+boundaryAlt)
+		data = append(data, "Content-Type: text/html; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.HTML)
+		data = append(data, "")
+		data = append(data, "--"+boundaryAlt+"--")
+		return data
+	}
+
+	if body.HTML != "" && body.Plain != "" && hasInlineAttachments {
+		data := make([]string, 0, 2)
+		data = append(data, "--"+boundary)
+		data = append(data, body.HTML)
+		return data
+	}
+
+	if body.HTML != "" && body.Plain != "" {
+		data := make([]string, 0, 8)
+		data = append(data, "--"+boundary)
+		data = append(data, "Content-Type: text/plain; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.Plain)
+		data = append(data, "")
+		data = append(data, "--"+boundary)
+		data = append(data, "Content-Type: text/html; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.HTML)
+		return data
+	}
+
+	if body.HTML != "" {
+		data := make([]string, 0, 2)
+		data = append(data, "--"+boundary)
+		data = append(data, "Content-Type: text/html; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.HTML)
+		return data
+	}
+
+	if body.Plain != "" {
+		data := make([]string, 0, 2)
+		data = append(data, "--"+boundary)
+		data = append(data, "Content-Type: text/plain; charset=UTF-8")
+		data = append(data, "Content-Transfer-Encoding: 7bit")
+		data = append(data, "")
+		data = append(data, body.Plain)
+		return data
+	}
+
+	data := make([]string, 0, 16)
+	data = append(data, "--"+boundary)
+	data = append(data, "Content-Type: text/plain; charset=UTF-8")
+	data = append(data, "Content-Transfer-Encoding: 7bit")
+	data = append(data, "")
+	data = append(data, "") // no content ?!?
+	return data
+}

googleapi/mimeMessage_test.go

@@ -0,0 +1,80 @@
+package googleapi
+
+import (
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
+	"os"
+	"testing"
+)
+
+func TestEncodeMimeMail(t *testing.T) {
+
+	mail := encodeMimeMail(
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail",
+		MailBody{Plain: "Plain Text"},
+		nil)
+
+	verifyMime(mail)
+}
+
+func TestEncodeMimeMail2(t *testing.T) {
+
+	mail := encodeMimeMail(
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (alternative)",
+		MailBody{
+			Plain: "Plain Text",
+			HTML:  "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		nil)
+
+	verifyMime(mail)
+}
+
+func TestEncodeMimeMail3(t *testing.T) {
+
+	mail := encodeMimeMail(
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (alternative)",
+		MailBody{
+			HTML: "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		[]MailAttachment{
+			{Data: []byte("HelloWorld"), Filename: "test.txt", IsInline: false, ContentType: "text/plain"},
+		})
+
+	verifyMime(mail)
+}
+
+func TestEncodeMimeMail4(t *testing.T) {
+
+	b := tst.Must(os.ReadFile("test_placeholder.png"))(t)
+
+	mail := encodeMimeMail(
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (inline)",
+		MailBody{
+			HTML: "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		[]MailAttachment{
+			{Data: b, Filename: "img.png", IsInline: true, ContentType: "image/png"},
+		})
+
+	verifyMime(mail)
+}
+
+func verifyMime(mail string) {
+	//fmt.Printf("%s\n\n", mail)
+}

googleapi/oAuth.go

@@ -0,0 +1,91 @@
+package googleapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+)
+
+type GoogleOAuth interface {
+	AccessToken() (string, error)
+}
+
+type oauth struct {
+	clientID     string
+	clientSecret string
+	refreshToken string
+
+	lock        sync.RWMutex
+	accessToken *string
+	expiryDate  *time.Time
+}
+
+func NewGoogleOAuth(clientid string, clientsecret, refreshtoken string) GoogleOAuth {
+	return &oauth{
+		clientID:     clientid,
+		clientSecret: clientsecret,
+		refreshToken: refreshtoken,
+	}
+}
+
+func (c *oauth) AccessToken() (string, error) {
+	c.lock.RLock()
+	if c.accessToken != nil && c.expiryDate != nil && (*c.expiryDate).After(time.Now()) {
+		c.lock.RUnlock()
+		return *c.accessToken, nil // still valid
+	}
+	c.lock.RUnlock()
+
+	httpclient := http.Client{}
+
+	url := fmt.Sprintf("https://oauth2.googleapis.com/token?client_id=%s&client_secret=%s&grant_type=%s&refresh_token=%s",
+		c.clientID,
+		c.clientSecret,
+		"refresh_token",
+		c.refreshToken)
+
+	req, err := http.NewRequest(http.MethodPost, url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	reqStartTime := time.Now()
+
+	res, err := httpclient.Do(req)
+
+	type response struct {
+		AccessToken string `json:"access_token"`
+		ExpiresIn   int    `json:"expires_in"`
+		Scope       string `json:"scope"`
+		TokenType   string `json:"token_type"`
+	}
+
+	var r response
+
+	data, err := io.ReadAll(res.Body)
+	if err != nil {
+		return "", err
+	}
+
+	err = json.Unmarshal(data, &r)
+	if err != nil {
+		return "", err
+	}
+
+	if r.ExpiresIn == 0 || r.AccessToken == "" {
+		return "", exerr.New(exerr.TypeGoogleResponse, "google oauth returned no response").Str("body", string(data)).Build()
+	}
+
+	c.lock.Lock()
+	c.expiryDate = langext.Ptr(reqStartTime.Add(timeext.FromSeconds(r.ExpiresIn - 10)))
+	c.accessToken = langext.Ptr(r.AccessToken)
+	c.lock.Unlock()
+
+	return r.AccessToken, nil
+}

googleapi/sendMail.go

@@ -0,0 +1,69 @@
+package googleapi
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"io"
+	"net/http"
+)
+
+type MailRef struct {
+	ID       string   `json:"id"`
+	ThreadID string   `json:"threadId"`
+	LabelIDs []string `json:"labelIds"`
+}
+
+func (c *client) SendMail(ctx context.Context, from string, recipients []string, cc []string, bcc []string, subject string, body MailBody, attachments []MailAttachment) (MailRef, error) {
+
+	mm := encodeMimeMail(from, recipients, cc, bcc, subject, body, attachments)
+
+	tok, err := c.oauth.AccessToken()
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Build()
+	}
+
+	url := fmt.Sprintf("https://gmail.googleapis.com/gmail/v1/users/%s/messages/send?alt=json&prettyPrint=false", "me")
+
+	msgbody, err := json.Marshal(langext.H{"raw": base64.URLEncoding.EncodeToString([]byte(mm))})
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Build()
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(msgbody))
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Build()
+	}
+
+	req.Header.Add("Authorization", "Bearer "+tok)
+	req.Header.Add("X-Goog-Api-Client", "blackforestbytes-goext/"+goext.GoextVersion)
+	req.Header.Add("User-Agent", "blackforestbytes-goext/"+goext.GoextVersion)
+	req.Header.Add("Content-Type", "application/json")
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Build()
+	}
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Build()
+	}
+
+	if resp.StatusCode != 200 {
+		return MailRef{}, exerr.New(exerr.TypeGoogleStatuscode, "gmail returned non-200 statuscode").Int("sc", resp.StatusCode).Str("body", string(respBody)).Build()
+	}
+
+	var respObj MailRef
+	err = json.Unmarshal(respBody, &respObj)
+	if err != nil {
+		return MailRef{}, exerr.Wrap(err, "").Str("body", string(respBody)).Build()
+	}
+
+	return respObj, nil
+}

googleapi/sendMail_test.go

@@ -0,0 +1,151 @@
+package googleapi
+
+import (
+	"context"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"gogs.mikescher.com/BlackForestBytes/goext/tst"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	if !exerr.Initialized() {
+		exerr.Init(exerr.ErrorPackageConfigInit{ZeroLogErrTraces: langext.PFalse, ZeroLogAllTraces: langext.PFalse})
+	}
+	os.Exit(m.Run())
+}
+
+func TestSendMail1(t *testing.T) {
+	t.Skip()
+	return
+
+	auth := NewGoogleOAuth(
+		"554617284247-8di0j6s5dcmlk4lmk4hdf9kdn8scss54.apps.googleusercontent.com",
+		"TODO",
+		"TODO")
+
+	ctx := context.Background()
+
+	gclient := NewGoogleClient(auth)
+
+	mail, err := gclient.SendMail(
+		ctx,
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail",
+		MailBody{Plain: "Plain Text"},
+		nil)
+
+	tst.AssertNoErr(t, err)
+
+	fmt.Printf("mail.ID        := %s\n", mail.ID)
+	fmt.Printf("mail.ThreadID  := %s\n", mail.ThreadID)
+	fmt.Printf("mail.LabelIDs  := %v\n", mail.LabelIDs)
+}
+
+func TestSendMail2(t *testing.T) {
+	t.Skip()
+	return
+
+	auth := NewGoogleOAuth(
+		"554617284247-8di0j6s5dcmlk4lmk4hdf9kdn8scss54.apps.googleusercontent.com",
+		"TODO",
+		"TODO")
+
+	ctx := context.Background()
+
+	gclient := NewGoogleClient(auth)
+
+	mail, err := gclient.SendMail(
+		ctx,
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (alternative)",
+		MailBody{
+			Plain: "Plain Text",
+			HTML:  "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		nil)
+
+	tst.AssertNoErr(t, err)
+
+	fmt.Printf("mail.ID        := %s\n", mail.ID)
+	fmt.Printf("mail.ThreadID  := %s\n", mail.ThreadID)
+	fmt.Printf("mail.LabelIDs  := %v\n", mail.LabelIDs)
+}
+
+func TestSendMail3(t *testing.T) {
+	t.Skip()
+	return
+
+	auth := NewGoogleOAuth(
+		"554617284247-8di0j6s5dcmlk4lmk4hdf9kdn8scss54.apps.googleusercontent.com",
+		"TODO",
+		"TODO")
+
+	ctx := context.Background()
+
+	gclient := NewGoogleClient(auth)
+
+	mail, err := gclient.SendMail(
+		ctx,
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (attach)",
+		MailBody{
+			HTML: "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		[]MailAttachment{
+			{Data: []byte("HelloWorld"), Filename: "test.txt", IsInline: false, ContentType: "text/plain"},
+		})
+
+	tst.AssertNoErr(t, err)
+
+	fmt.Printf("mail.ID        := %s\n", mail.ID)
+	fmt.Printf("mail.ThreadID  := %s\n", mail.ThreadID)
+	fmt.Printf("mail.LabelIDs  := %v\n", mail.LabelIDs)
+}
+
+func TestSendMail4(t *testing.T) {
+	t.Skip()
+	return
+
+	auth := NewGoogleOAuth(
+		"554617284247-8di0j6s5dcmlk4lmk4hdf9kdn8scss54.apps.googleusercontent.com",
+		"TODO",
+		"TODO")
+
+	ctx := context.Background()
+
+	gclient := NewGoogleClient(auth)
+
+	b := tst.Must(os.ReadFile("test_placeholder.png"))(t)
+
+	mail, err := gclient.SendMail(
+		ctx,
+		"noreply@heydyno.de",
+		[]string{"trash@mikescher.de"},
+		nil,
+		nil,
+		"Hello Test Mail (inline)",
+		MailBody{
+			HTML: "<html><body><u>Non</u> Pl<i>ai</i>n T<b>ex</b>t</body></html>",
+		},
+		[]MailAttachment{
+			{Data: b, Filename: "img.png", IsInline: true, ContentType: "image/png"},
+		})
+
+	tst.AssertNoErr(t, err)
+
+	fmt.Printf("mail.ID        := %s\n", mail.ID)
+	fmt.Printf("mail.ThreadID  := %s\n", mail.ThreadID)
+	fmt.Printf("mail.LabelIDs  := %v\n", mail.LabelIDs)
+}

googleapi/service.go

@@ -0,0 +1,22 @@
+package googleapi
+
+import (
+	"context"
+	"net/http"
+)
+
+type GoogleClient interface {
+	SendMail(ctx context.Context, from string, recipients []string, cc []string, bcc []string, subject string, body MailBody, attachments []MailAttachment) (MailRef, error)
+}
+
+type client struct {
+	oauth GoogleOAuth
+	http  http.Client
+}
+
+func NewGoogleClient(oauth GoogleOAuth) GoogleClient {
+	return &client{
+		oauth: oauth,
+		http:  http.Client{},
+	}
+}

imageext/enums.go

@@ -0,0 +1,3 @@
+package imageext
+
+//go:generate go run ../_gen/enum-generate.go -- enums_gen.go

imageext/enums_gen.go

@@ -0,0 +1,216 @@
+// Code generated by enum-generate.go DO NOT EDIT.
+
+package imageext
+
+import "gogs.mikescher.com/BlackForestBytes/goext/langext"
+import "gogs.mikescher.com/BlackForestBytes/goext/enums"
+
+const ChecksumEnumGenerator = "1da5383c33ee442fd0b899369053f66bdc85bed2dbf906949d3edfeedfe13340" // GoExtVersion: 0.0.449
+
+// ================================ ImageFit ================================
+//
+// File:       image.go
+// StringEnum: true
+// DescrEnum:  false
+// DataEnum:   false
+//
+
+var __ImageFitValues = []ImageFit{
+	ImageFitStretch,
+	ImageFitCover,
+	ImageFitContainCenter,
+	ImageFitContainTopLeft,
+	ImageFitContainTopRight,
+	ImageFitContainBottomLeft,
+	ImageFitContainBottomRight,
+}
+
+var __ImageFitVarnames = map[ImageFit]string{
+	ImageFitStretch:            "ImageFitStretch",
+	ImageFitCover:              "ImageFitCover",
+	ImageFitContainCenter:      "ImageFitContainCenter",
+	ImageFitContainTopLeft:     "ImageFitContainTopLeft",
+	ImageFitContainTopRight:    "ImageFitContainTopRight",
+	ImageFitContainBottomLeft:  "ImageFitContainBottomLeft",
+	ImageFitContainBottomRight: "ImageFitContainBottomRight",
+}
+
+func (e ImageFit) Valid() bool {
+	return langext.InArray(e, __ImageFitValues)
+}
+
+func (e ImageFit) Values() []ImageFit {
+	return __ImageFitValues
+}
+
+func (e ImageFit) ValuesAny() []any {
+	return langext.ArrCastToAny(__ImageFitValues)
+}
+
+func (e ImageFit) ValuesMeta() []enums.EnumMetaValue {
+	return ImageFitValuesMeta()
+}
+
+func (e ImageFit) String() string {
+	return string(e)
+}
+
+func (e ImageFit) VarName() string {
+	if d, ok := __ImageFitVarnames[e]; ok {
+		return d
+	}
+	return ""
+}
+
+func (e ImageFit) TypeName() string {
+	return "ImageFit"
+}
+
+func (e ImageFit) PackageName() string {
+	return "media"
+}
+
+func (e ImageFit) Meta() enums.EnumMetaValue {
+	return enums.EnumMetaValue{VarName: e.VarName(), Value: e, Description: nil}
+}
+
+func ParseImageFit(vv string) (ImageFit, bool) {
+	for _, ev := range __ImageFitValues {
+		if string(ev) == vv {
+			return ev, true
+		}
+	}
+	return "", false
+}
+
+func ImageFitValues() []ImageFit {
+	return __ImageFitValues
+}
+
+func ImageFitValuesMeta() []enums.EnumMetaValue {
+	return []enums.EnumMetaValue{
+		ImageFitStretch.Meta(),
+		ImageFitCover.Meta(),
+		ImageFitContainCenter.Meta(),
+		ImageFitContainTopLeft.Meta(),
+		ImageFitContainTopRight.Meta(),
+		ImageFitContainBottomLeft.Meta(),
+		ImageFitContainBottomRight.Meta(),
+	}
+}
+
+// ================================ ImageCompresson ================================
+//
+// File:       image.go
+// StringEnum: true
+// DescrEnum:  false
+// DataEnum:   false
+//
+
+var __ImageCompressonValues = []ImageCompresson{
+	CompressionPNGNone,
+	CompressionPNGSpeed,
+	CompressionPNGBest,
+	CompressionJPEG100,
+	CompressionJPEG90,
+	CompressionJPEG80,
+	CompressionJPEG70,
+	CompressionJPEG60,
+	CompressionJPEG50,
+	CompressionJPEG25,
+	CompressionJPEG10,
+	CompressionJPEG1,
+}
+
+var __ImageCompressonVarnames = map[ImageCompresson]string{
+	CompressionPNGNone:  "CompressionPNGNone",
+	CompressionPNGSpeed: "CompressionPNGSpeed",
+	CompressionPNGBest:  "CompressionPNGBest",
+	CompressionJPEG100:  "CompressionJPEG100",
+	CompressionJPEG90:   "CompressionJPEG90",
+	CompressionJPEG80:   "CompressionJPEG80",
+	CompressionJPEG70:   "CompressionJPEG70",
+	CompressionJPEG60:   "CompressionJPEG60",
+	CompressionJPEG50:   "CompressionJPEG50",
+	CompressionJPEG25:   "CompressionJPEG25",
+	CompressionJPEG10:   "CompressionJPEG10",
+	CompressionJPEG1:    "CompressionJPEG1",
+}
+
+func (e ImageCompresson) Valid() bool {
+	return langext.InArray(e, __ImageCompressonValues)
+}
+
+func (e ImageCompresson) Values() []ImageCompresson {
+	return __ImageCompressonValues
+}
+
+func (e ImageCompresson) ValuesAny() []any {
+	return langext.ArrCastToAny(__ImageCompressonValues)
+}
+
+func (e ImageCompresson) ValuesMeta() []enums.EnumMetaValue {
+	return ImageCompressonValuesMeta()
+}
+
+func (e ImageCompresson) String() string {
+	return string(e)
+}
+
+func (e ImageCompresson) VarName() string {
+	if d, ok := __ImageCompressonVarnames[e]; ok {
+		return d
+	}
+	return ""
+}
+
+func (e ImageCompresson) TypeName() string {
+	return "ImageCompresson"
+}
+
+func (e ImageCompresson) PackageName() string {
+	return "media"
+}
+
+func (e ImageCompresson) Meta() enums.EnumMetaValue {
+	return enums.EnumMetaValue{VarName: e.VarName(), Value: e, Description: nil}
+}
+
+func ParseImageCompresson(vv string) (ImageCompresson, bool) {
+	for _, ev := range __ImageCompressonValues {
+		if string(ev) == vv {
+			return ev, true
+		}
+	}
+	return "", false
+}
+
+func ImageCompressonValues() []ImageCompresson {
+	return __ImageCompressonValues
+}
+
+func ImageCompressonValuesMeta() []enums.EnumMetaValue {
+	return []enums.EnumMetaValue{
+		CompressionPNGNone.Meta(),
+		CompressionPNGSpeed.Meta(),
+		CompressionPNGBest.Meta(),
+		CompressionJPEG100.Meta(),
+		CompressionJPEG90.Meta(),
+		CompressionJPEG80.Meta(),
+		CompressionJPEG70.Meta(),
+		CompressionJPEG60.Meta(),
+		CompressionJPEG50.Meta(),
+		CompressionJPEG25.Meta(),
+		CompressionJPEG10.Meta(),
+		CompressionJPEG1.Meta(),
+	}
+}
+
+// ================================ ================= ================================
+
+func AllPackageEnums() []enums.Enum {
+	return []enums.Enum{
+		ImageFitStretch,    // ImageFit
+		CompressionPNGNone, // ImageCompresson
+	}
+}

imageext/image.go

@@ -0,0 +1,321 @@
+package imageext
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/disintegration/imaging"
+	"gogs.mikescher.com/BlackForestBytes/goext/exerr"
+	"gogs.mikescher.com/BlackForestBytes/goext/mathext"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"math"
+)
+
+type ImageFit string //@enum:type
+
+const (
+	ImageFitStretch            ImageFit = "STRETCH"
+	ImageFitCover              ImageFit = "COVER"
+	ImageFitContainCenter      ImageFit = "CONTAIN_CENTER"
+	ImageFitContainTopLeft     ImageFit = "CONTAIN_TOPLEFT"
+	ImageFitContainTopRight    ImageFit = "CONTAIN_TOPRIGHT"
+	ImageFitContainBottomLeft  ImageFit = "CONTAIN_BOTTOMLEFT"
+	ImageFitContainBottomRight ImageFit = "CONTAIN_BOTTOMRIGHT"
+)
+
+type ImageCrop struct { // all crop values are percentages!
+
+	CropX      float64 `bson:"cropX"      json:"cropX"`
+	CropY      float64 `bson:"cropY"      json:"cropY"`
+	CropWidth  float64 `bson:"cropWidth"  json:"cropWidth"`
+	CropHeight float64 `bson:"cropHeight" json:"cropHeight"`
+}
+
+type ImageCompresson string //@enum:type
+
+const (
+	CompressionPNGNone  ImageCompresson = "PNG_NONE"
+	CompressionPNGSpeed ImageCompresson = "PNG_SPEED"
+	CompressionPNGBest  ImageCompresson = "PNG_BEST"
+	CompressionJPEG100  ImageCompresson = "JPEG_100"
+	CompressionJPEG90   ImageCompresson = "JPEG_090"
+	CompressionJPEG80   ImageCompresson = "JPEG_080"
+	CompressionJPEG70   ImageCompresson = "JPEG_070"
+	CompressionJPEG60   ImageCompresson = "JPEG_060"
+	CompressionJPEG50   ImageCompresson = "JPEG_050"
+	CompressionJPEG25   ImageCompresson = "JPEG_025"
+	CompressionJPEG10   ImageCompresson = "JPEG_010"
+	CompressionJPEG1    ImageCompresson = "JPEG_001"
+)
+
+func CropImage(img image.Image, px float64, py float64, pw float64, ph float64) (image.Image, error) {
+
+	type subImager interface {
+		SubImage(r image.Rectangle) image.Image
+	}
+
+	x := int(float64(img.Bounds().Dx()) * px)
+	y := int(float64(img.Bounds().Dy()) * py)
+	w := int(float64(img.Bounds().Dx()) * pw)
+	h := int(float64(img.Bounds().Dy()) * ph)
+
+	if simg, ok := img.(subImager); ok {
+
+		return simg.SubImage(image.Rect(x, y, x+w, y+h)), nil
+
+	} else {
+
+		bfr1 := bytes.Buffer{}
+		err := png.Encode(&bfr1, img)
+		if err != nil {
+			return nil, exerr.Wrap(err, "").Build()
+		}
+		imgPNG, err := png.Decode(&bfr1)
+		if err != nil {
+			return nil, exerr.Wrap(err, "").Build()
+		}
+
+		return imgPNG.(subImager).SubImage(image.Rect(x, y, w+w, y+h)), nil
+	}
+}
+
+func EncodeImage(img image.Image, compression ImageCompresson) (bytes.Buffer, string, error) {
+	var err error
+
+	bfr := bytes.Buffer{}
+
+	switch compression {
+	case CompressionPNGNone:
+		enc := &png.Encoder{CompressionLevel: png.NoCompression}
+		err = enc.Encode(&bfr, img)
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/png", nil
+	case CompressionPNGSpeed:
+		enc := &png.Encoder{CompressionLevel: png.BestSpeed}
+		err = enc.Encode(&bfr, img)
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/png", nil
+	case CompressionPNGBest:
+		enc := &png.Encoder{CompressionLevel: png.BestCompression}
+		err = enc.Encode(&bfr, img)
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/png", nil
+	case CompressionJPEG100:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 100})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG90:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 90})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG80:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 80})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG70:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 70})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG60:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 60})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG50:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 50})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG25:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 25})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG10:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 10})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	case CompressionJPEG1:
+		err = jpeg.Encode(&bfr, img, &jpeg.Options{Quality: 1})
+		if err != nil {
+			return bytes.Buffer{}, "", exerr.Wrap(err, "").Build()
+		}
+		return bfr, "image/jpeg", nil
+	default:
+		return bytes.Buffer{}, "", exerr.New(exerr.TypeInternal, "unknown compression method: "+compression.String()).Build()
+	}
+}
+
+func ObjectFitImage(img image.Image, bbw float64, bbh float64, fit ImageFit, fillColor color.Color) (image.Image, PercentageRectangle, error) {
+
+	iw := img.Bounds().Size().X
+	ih := img.Bounds().Size().Y
+
+	// [iw, ih]   is the size of the image
+	// [bbw, bbh] is the target bounding box,
+	//             - it specifies the target ratio
+	//             - and the maximal target resolution
+
+	facW := float64(iw) / bbw
+	facH := float64(ih) / bbh
+
+	// facW is the ratio between iw and bbw
+	//  - it is the factor by which the bounding box must be multiplied to reach the image size (in the x-axis)
+	//
+	// (same is true for facH, but for the height and y-axis)
+
+	if fit == ImageFitCover {
+
+		// image-fit:cover completely fills the target-bounding-box, it potentially cuts parts of the image away
+
+		// we use the smaller (!) value of facW and facH, because we want to have the smallest possible destination rect (due to file size)
+		// and because the image is made to completely fill the bounding-box, the smaller factor (= teh dimension the image is stretched more) is relevant
+
+		// but we cap `fac` at 1 (can be larger than 1)
+		// a value >1 would mean the final image resolution is biger than the bounding box, which we do not want.
+
+		// if the initial image (iw, ih) is already bigger than the bounding box (bbw, bbh), facW and facH are always >1 and fac will be 1
+		// which means we will simply use the bounding box as destination rect (and scale the image down)
+
+		fac := mathext.Clamp(mathext.Min(facW, facH), 0.0, 1.0)
+
+		// we scale the bounding box by fac (both dimension the same amount, to keep the bounding-box ratio)
+
+		w := int(math.Round(bbw * fac))
+		h := int(math.Round(bbh * fac))
+
+		img = imaging.Fill(img, w, h, imaging.Center, imaging.Lanczos)
+
+		newImg := image.NewRGBA(image.Rect(0, 0, w, h))
+
+		draw.Draw(newImg, newImg.Bounds(), &image.Uniform{C: fillColor}, image.Pt(0, 0), draw.Src)
+		draw.Draw(newImg, newImg.Bounds(), img, image.Pt(0, 0), draw.Over)
+
+		return newImg, PercentageRectangle{0, 0, 1, 1}, nil
+	}
+
+	if fit == ImageFitContainCenter || fit == ImageFitContainTopLeft || fit == ImageFitContainTopRight || fit == ImageFitContainBottomLeft || fit == ImageFitContainBottomRight {
+
+		// image-fit:contain fills the target-bounding-box with the image, there is potentially empty-space, it potentially cuts parts of the image away
+
+		// we use the bigger (!) value of facW and facH,
+		// because the image is made to fit the bounding-box, the bigger factor (= the dimension the image is stretched less) is relevant
+
+		// but we cap `fac` at 1 (can be larger than 1)
+		// a value >1 would mean the final image resolution is biger than the bounding box, which we do not want.
+
+		// if the initial image (iw, ih) is already bigger than the bounding box (bbw, bbh), facW and facH are always >1 and fac will be 1
+		// which means we will simply use the bounding box as destination rect (and scale the image down)
+
+		facOut := mathext.Clamp(mathext.Max(facW, facH), 0.0, 1.0)
+
+		// we scale the bounding box by fac (both dimension the same amount, to keep the bounding-box ratio)
+
+		// [ow|oh] ==> size of output image (same ratio as bounding box [bbw|bbh])
+
+		ow := int(math.Round(bbw * facOut))
+		oh := int(math.Round(bbh * facOut))
+
+		facScale := mathext.Min(float64(ow)/float64(iw), float64(oh)/float64(ih))
+
+		// [dw|dh] ==> size of destination rect (where to draw source in output image) (same ratio as input image [iw|ih])
+
+		dw := int(math.Round(float64(iw) * facScale))
+		dh := int(math.Round(float64(ih) * facScale))
+
+		img = imaging.Resize(img, dw, dh, imaging.Lanczos)
+
+		var destBounds image.Rectangle
+		if fit == ImageFitContainCenter {
+			destBounds = image.Rect((ow-dw)/2, (oh-dh)/2, (ow-dw)/2+dw, (oh-dh)/2+dh)
+		} else if fit == ImageFitContainTopLeft {
+			destBounds = image.Rect(0, 0, dw, dh)
+		} else if fit == ImageFitContainTopRight {
+			destBounds = image.Rect(ow-dw, 0, ow, dh)
+		} else if fit == ImageFitContainBottomLeft {
+			destBounds = image.Rect(0, oh-dh, dw, oh)
+		} else if fit == ImageFitContainBottomRight {
+			destBounds = image.Rect(ow-dw, oh-dh, ow, oh)
+		}
+
+		newImg := image.NewRGBA(image.Rect(0, 0, ow, oh))
+
+		draw.Draw(newImg, newImg.Bounds(), &image.Uniform{C: fillColor}, image.Pt(0, 0), draw.Src)
+		draw.Draw(newImg, destBounds, img, image.Pt(0, 0), draw.Over)
+
+		return newImg, calcRelativeRect(destBounds, newImg.Bounds()), nil
+	}
+
+	if fit == ImageFitStretch {
+
+		// image-fit:stretch simply stretches the image to the bounding box
+
+		// we use the bigger value of [facW;facH], to (potentially) scale the bounding box down before applying it
+		// theoretically we could directly use [bbw, bbh] in the call to imaging.Resize,
+		// but if the image is (a lot) smaller than the bouding box it is useful to scale it down to reduce final pdf filesize
+
+		// we also cap fac at 1, because we never want the final rect to be bigger than the inputted bounding box (see comments at start of method)
+
+		fac := mathext.Clamp(mathext.Max(facW, facH), 0.0, 1.0)
+
+		// we scale the bounding box by fac (both dimension the same amount, to keep the bounding-box ratio)
+
+		w := int(math.Round(bbw * fac))
+		h := int(math.Round(bbh * fac))
+
+		img = imaging.Resize(img, w, h, imaging.Lanczos)
+
+		newImg := image.NewRGBA(image.Rect(0, 0, w, h))
+
+		draw.Draw(newImg, newImg.Bounds(), &image.Uniform{C: fillColor}, image.Pt(0, 0), draw.Src)
+		draw.Draw(newImg, newImg.Bounds(), img, image.Pt(0, 0), draw.Over)
+
+		return newImg, PercentageRectangle{0, 0, 1, 1}, nil
+	}
+
+	return nil, PercentageRectangle{}, exerr.New(exerr.TypeInternal, fmt.Sprintf("unknown image-fit: '%s'", fit)).Build()
+}
+
+func VerifyAndDecodeImage(data io.Reader, mime string) (image.Image, error) {
+
+	if mime == "image/jpeg" {
+		img, err := jpeg.Decode(data)
+		if err != nil {
+			return nil, exerr.Wrap(err, "failed to decode blob as jpeg").WithType(exerr.TypeInvalidImage).Build()
+		}
+		return img, nil
+	}
+
+	if mime == "image/png" {
+		img, err := png.Decode(data)
+		if err != nil {
+			return nil, exerr.Wrap(err, "failed to decode blob as png").WithType(exerr.TypeInvalidImage).Build()
+		}
+		return img, nil
+	}
+
+	return nil, exerr.New(exerr.TypeInvalidMimeType, fmt.Sprintf("unknown/invalid image mimetype: '%s'", mime)).Build()
+}

imageext/types.go

@@ -0,0 +1,35 @@
+package imageext
+
+import "image"
+
+type Rectangle struct {
+	X float64
+	Y float64
+	W float64
+	H float64
+}
+
+type PercentageRectangle struct {
+	X float64 // [0..1]
+	Y float64 // [0..1]
+	W float64 // [0..1]
+	H float64 // [0..1]
+}
+
+func (r PercentageRectangle) Of(ref Rectangle) Rectangle {
+	return Rectangle{
+		X: ref.X + r.X*ref.W,
+		Y: ref.Y + r.Y*ref.H,
+		W: r.W * ref.W,
+		H: r.H * ref.H,
+	}
+}
+
+func calcRelativeRect(inner image.Rectangle, outer image.Rectangle) PercentageRectangle {
+	return PercentageRectangle{
+		X: float64(inner.Min.X-outer.Min.X) / float64(outer.Dx()),
+		Y: float64(inner.Min.Y-outer.Min.Y) / float64(outer.Dy()),
+		W: float64(inner.Dx()) / float64(outer.Dx()),
+		H: float64(inner.Dy()) / float64(outer.Dy()),
+	}
+}

langext/array.go

@@ -59,6 +59,18 @@ func ArrUnique[T comparable](array []T) []T {
 	return result
 }
 
+func ArrUniqueStable[T comparable](array []T) []T {
+	hist := make(map[T]bool, len(array))
+	result := make([]T, 0, len(array))
+	for _, v := range array {
+		if _, ok := hist[v]; !ok {
+			hist[v] = true
+			result = append(result, v)
+		}
+	}
+	return result
+}
+
 func ArrEqualsExact[T comparable](arr1 []T, arr2 []T) bool {
 	if len(arr1) != len(arr2) {
 		return false
@@ -265,6 +277,15 @@ func ArrFirstIndex[T comparable](arr []T, needle T) int {
 	return -1
 }
 
+func ArrFirstIndexFunc[T any](arr []T, comp func(v T) bool) int {
+	for i, v := range arr {
+		if comp(v) {
+			return i
+		}
+	}
+	return -1
+}
+
 func ArrLastIndex[T comparable](arr []T, needle T) int {
 	result := -1
 	for i, v := range arr {
@@ -275,6 +296,16 @@ func ArrLastIndex[T comparable](arr []T, needle T) int {
 	return result
 }
 
+func ArrLastIndexFunc[T any](arr []T, comp func(v T) bool) int {
+	result := -1
+	for i, v := range arr {
+		if comp(v) {
+			result = i
+		}
+	}
+	return result
+}
+
 func AddToSet[T comparable](set []T, add T) []T {
 	for _, v := range set {
 		if v == add {
@@ -292,6 +323,16 @@ func ArrMap[T1 any, T2 any](arr []T1, conv func(v T1) T2) []T2 {
 	return r
 }
 
+func ArrDeRef[T1 any](arr []*T1) []T1 {
+	r := make([]T1, 0, len(arr))
+	for _, v := range arr {
+		if v != nil {
+			r = append(r, *v)
+		}
+	}
+	return r
+}
+
 func MapMap[TK comparable, TV any, TR any](inmap map[TK]TV, conv func(k TK, v TV) TR) []TR {
 	r := make([]TR, 0, len(inmap))
 	for k, v := range inmap {
@@ -360,6 +401,14 @@ func ArrSum[T NumberConstraint](arr []T) T {
 	return r
 }
 
+func ArrMapSum[T1 any, T2 NumberConstraint](arr []T1, conv func(v T1) T2) T2 {
+	var r T2 = 0
+	for _, v := range arr {
+		r += conv(v)
+	}
+	return r
+}
+
 func ArrFlatten[T1 any, T2 any](arr []T1, conv func(v T1) []T2) []T2 {
 	r := make([]T2, 0, len(arr))
 	for _, v1 := range arr {
@@ -434,6 +483,26 @@ func ArrConcat[T any](arr ...[]T) []T {
 	return r
 }
 
+// ArrAppend works similar to append(x, y, z) - but doe snot touch the old array and creates a new one
+func ArrAppend[T any](arr []T, add ...T) []T {
+	r := ArrCopy(arr)
+	for _, v := range add {
+		r = append(r, v)
+	}
+	return r
+}
+
+// ArrPrepend works similar to append(x, y, z) - but doe snot touch the old array and creates a new one
+// Also - in contrast to ArrAppend - the add values are inserted at the start of the resulting array (in reverse order)
+func ArrPrepend[T any](arr []T, add ...T) []T {
+	out := make([]T, len(arr)+len(add))
+	copy(out[len(add):], arr)
+	for i := 0; i < len(add); i++ {
+		out[len(add)-i-1] = add[i]
+	}
+	return out
+}
+
 // ArrCopy does a shallow copy of the 'in' array
 func ArrCopy[T any](in []T) []T {
 	out := make([]T, len(in))
@@ -449,6 +518,10 @@ func ArrRemove[T comparable](arr []T, needle T) []T {
 	return arr
 }
 
+func ArrRemoveAt[T any](arr []T, idx int) []T {
+	return append(arr[:idx], arr[idx+1:]...)
+}
+
 func ArrExcept[T comparable](arr []T, needles ...T) []T {
 	r := make([]T, 0, len(arr))
 	rmlist := ArrToSet(needles)
@@ -479,3 +552,48 @@ func JoinString(arr []string, delimiter string) string {
 
 	return str
 }
+
+// ArrChunk splits the array into buckets of max-size `chunkSize`
+// order is being kept.
+// The last chunk may contain less than length elements.
+//
+// (chunkSize == -1) means no chunking
+//
+// see https://www.php.net/manual/en/function.array-chunk.php
+func ArrChunk[T any](arr []T, chunkSize int) [][]T {
+	if chunkSize == -1 {
+		return [][]T{arr}
+	}
+
+	res := make([][]T, 0, 1+len(arr)/chunkSize)
+
+	i := 0
+	for i < len(arr) {
+
+		right := i + chunkSize
+		if right >= len(arr) {
+			right = len(arr)
+		}
+
+		res = append(res, arr[i:right])
+
+		i = right
+	}
+
+	return res
+}
+
+func ArrGroupBy[T1 any, T2 comparable](arr []T1, groupfunc func(v T1) T2) map[T2][]T1 {
+	r := make(map[T2][]T1)
+
+	for _, v := range arr {
+		key := groupfunc(v)
+		if _, ok := r[key]; ok {
+			r[key] = append(r[key], v)
+		} else {
+			r[key] = []T1{v}
+		}
+	}
+
+	return r
+}