v0.0.35

dataext/structHash.go

@@ -0,0 +1,254 @@
+package dataext
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"hash"
+	"io"
+	"reflect"
+	"sort"
+)
+
+type StructHashOptions struct {
+	HashAlgo    hash.Hash
+	Tag         *string
+	SkipChannel bool
+	SkipFunc    bool
+}
+
+func StructHash(dat any, opt ...StructHashOptions) (r []byte, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			r = nil
+			err = errors.New(fmt.Sprintf("recovered panic: %v", rec))
+		}
+	}()
+
+	shopt := StructHashOptions{}
+	if len(opt) > 1 {
+		return nil, errors.New("multiple options supplied")
+	} else if len(opt) == 1 {
+		shopt = opt[0]
+	}
+
+	if shopt.HashAlgo == nil {
+		shopt.HashAlgo = sha256.New()
+	}
+
+	writer := new(bytes.Buffer)
+
+	if langext.IsNil(dat) {
+		shopt.HashAlgo.Reset()
+		shopt.HashAlgo.Write(writer.Bytes())
+		res := shopt.HashAlgo.Sum(nil)
+		return res, nil
+	}
+
+	err = binarize(writer, reflect.ValueOf(dat), shopt)
+	if err != nil {
+		return nil, err
+	}
+
+	shopt.HashAlgo.Reset()
+	shopt.HashAlgo.Write(writer.Bytes())
+	res := shopt.HashAlgo.Sum(nil)
+
+	return res, nil
+}
+
+func writeBinarized(writer io.Writer, dat any) error {
+	tmp := bytes.Buffer{}
+	err := binary.Write(&tmp, binary.LittleEndian, dat)
+	if err != nil {
+		return err
+	}
+	err = binary.Write(writer, binary.LittleEndian, uint64(tmp.Len()))
+	if err != nil {
+		return err
+	}
+	_, err = writer.Write(tmp.Bytes())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func binarize(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	var err error
+
+	err = binary.Write(writer, binary.LittleEndian, uint8(dat.Kind()))
+	switch dat.Kind() {
+	case reflect.Ptr, reflect.Map, reflect.Array, reflect.Chan, reflect.Slice, reflect.Interface:
+		if dat.IsNil() {
+			err = binary.Write(writer, binary.LittleEndian, uint64(0))
+			if err != nil {
+				return err
+			}
+			return nil
+		}
+	}
+
+	err = binary.Write(writer, binary.LittleEndian, uint64(len(dat.Type().String())))
+	if err != nil {
+		return err
+	}
+	_, err = writer.Write([]byte(dat.Type().String()))
+	if err != nil {
+		return err
+	}
+
+	switch dat.Type().Kind() {
+	case reflect.Invalid:
+		return errors.New("cannot binarize value of kind <Invalid>")
+	case reflect.Bool:
+		return writeBinarized(writer, dat.Bool())
+	case reflect.Int:
+		return writeBinarized(writer, int64(dat.Int()))
+	case reflect.Int8:
+		fallthrough
+	case reflect.Int16:
+		fallthrough
+	case reflect.Int32:
+		fallthrough
+	case reflect.Int64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Uint:
+		return writeBinarized(writer, uint64(dat.Int()))
+	case reflect.Uint8:
+		fallthrough
+	case reflect.Uint16:
+		fallthrough
+	case reflect.Uint32:
+		fallthrough
+	case reflect.Uint64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Uintptr:
+		return errors.New("cannot binarize value of kind <Uintptr>")
+	case reflect.Float32:
+		fallthrough
+	case reflect.Float64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Complex64:
+		return errors.New("cannot binarize value of kind <Complex64>")
+	case reflect.Complex128:
+		return errors.New("cannot binarize value of kind <Complex128>")
+	case reflect.Slice:
+		fallthrough
+	case reflect.Array:
+		return binarizeArrayOrSlice(writer, dat, opt)
+	case reflect.Chan:
+		if opt.SkipChannel {
+			return nil
+		}
+		return errors.New("cannot binarize value of kind <Chan>")
+	case reflect.Func:
+		if opt.SkipFunc {
+			return nil
+		}
+		return errors.New("cannot binarize value of kind <Func>")
+	case reflect.Interface:
+		return binarize(writer, dat.Elem(), opt)
+	case reflect.Map:
+		return binarizeMap(writer, dat, opt)
+	case reflect.Pointer:
+		return binarize(writer, dat.Elem(), opt)
+	case reflect.String:
+		v := dat.String()
+		err = binary.Write(writer, binary.LittleEndian, uint64(len(v)))
+		if err != nil {
+			return err
+		}
+		_, err = writer.Write([]byte(v))
+		if err != nil {
+			return err
+		}
+		return nil
+	case reflect.Struct:
+		return binarizeStruct(writer, dat, opt)
+	case reflect.UnsafePointer:
+		return errors.New("cannot binarize value of kind <UnsafePointer>")
+	default:
+		return errors.New("cannot binarize value of unknown kind <" + dat.Type().Kind().String() + ">")
+	}
+}
+
+func binarizeStruct(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.NumField()))
+	if err != nil {
+		return err
+	}
+
+	for i := 0; i < dat.NumField(); i++ {
+
+		if opt.Tag != nil {
+			if _, ok := dat.Type().Field(i).Tag.Lookup(*opt.Tag); !ok {
+				continue
+			}
+		}
+
+		err = binary.Write(writer, binary.LittleEndian, uint64(len(dat.Type().Field(i).Name)))
+		if err != nil {
+			return err
+		}
+		_, err = writer.Write([]byte(dat.Type().Field(i).Name))
+		if err != nil {
+			return err
+		}
+
+		err = binarize(writer, dat.Field(i), opt)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func binarizeArrayOrSlice(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.Len()))
+	if err != nil {
+		return err
+	}
+
+	for i := 0; i < dat.Len(); i++ {
+		err := binarize(writer, dat.Index(i), opt)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func binarizeMap(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.Len()))
+	if err != nil {
+		return err
+	}
+
+	sub := make([][]byte, 0, dat.Len())
+
+	for _, k := range dat.MapKeys() {
+		tmp := bytes.Buffer{}
+		err = binarize(&tmp, dat.MapIndex(k), opt)
+		if err != nil {
+			return err
+		}
+		sub = append(sub, tmp.Bytes())
+	}
+
+	sort.Slice(sub, func(i1, i2 int) bool { return bytes.Compare(sub[i1], sub[i2]) < 0 })
+
+	for _, v := range sub {
+		_, err = writer.Write(v)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

dataext/structHash_test.go

@@ -0,0 +1,143 @@
+package dataext
+
+import (
+	"encoding/hex"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"testing"
+)
+
+func noErrStructHash(t *testing.T, dat any, opt ...StructHashOptions) []byte {
+	res, err := StructHash(dat, opt...)
+	if err != nil {
+		t.Error(err)
+		t.FailNow()
+		return nil
+	}
+	return res
+}
+
+func TestStructHashSimple(t *testing.T) {
+
+	assertEqual(t, "209bf774af36cc3a045c152d9f1269ef3684ad819c1359ee73ff0283a308fefa", noErrStructHash(t, "Hello"))
+	assertEqual(t, "c32f3626b981ae2997db656f3acad3f1dc9d30ef6b6d14296c023e391b25f71a", noErrStructHash(t, 0))
+	assertEqual(t, "01b781b03e9586b257d387057dfc70d9f06051e7d3c1e709a57e13cc8daf3e35", noErrStructHash(t, []byte{}))
+	assertEqual(t, "93e1dcd45c732fe0079b0fb3204c7c803f0921835f6bfee2e6ff263e73eed53c", noErrStructHash(t, []int{}))
+	assertEqual(t, "54f637a376aad55b3160d98ebbcae8099b70d91b9400df23fb3709855d59800a", noErrStructHash(t, []int{1, 2, 3}))
+	assertEqual(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", noErrStructHash(t, nil))
+	assertEqual(t, "349a7db91aa78fd30bbaa7c7f9c7bfb2fcfe72869b4861162a96713a852f60d3", noErrStructHash(t, []any{1, "", nil}))
+	assertEqual(t, "ca51aab87808bf0062a4a024de6aac0c2bad54275cc857a4944569f89fd245ad", noErrStructHash(t, struct{}{}))
+
+}
+
+func TestStructHashSimpleStruct(t *testing.T) {
+
+	type t0 struct {
+		F1 int
+		F2 []string
+		F3 *int
+	}
+
+	assertEqual(t, "a90bff751c70c738bb5cfc9b108e783fa9c19c0bc9273458e0aaee6e74aa1b92", noErrStructHash(t, t0{
+		F1: 10,
+		F2: []string{"1", "2", "3"},
+		F3: nil,
+	}))
+
+	assertEqual(t, "5d09090dc34ac59dd645f197a255f653387723de3afa1b614721ea5a081c675f", noErrStructHash(t, t0{
+		F1: 10,
+		F2: []string{"1", "2", "3"},
+		F3: langext.Ptr(99),
+	}))
+
+}
+
+func TestStructHashLayeredStruct(t *testing.T) {
+
+	type t1_1 struct {
+		F10 float32
+		F12 float64
+		F15 bool
+	}
+	type t1_2 struct {
+		SV1 *t1_1
+		SV2 *t1_1
+		SV3 t1_1
+	}
+
+	assertEqual(t, "fd4ca071fb40a288fee4b7a3dfdaab577b30cb8f80f81ec511e7afd72dc3b469", noErrStructHash(t, t1_2{
+		SV1: nil,
+		SV2: nil,
+		SV3: t1_1{
+			F10: 1,
+			F12: 2,
+			F15: false,
+		},
+	}))
+	assertEqual(t, "3fbf7c67d8121deda075cc86319a4e32d71744feb2cebf89b43bc682f072a029", noErrStructHash(t, t1_2{
+		SV1: nil,
+		SV2: &t1_1{},
+		SV3: t1_1{
+			F10: 3,
+			F12: 4,
+			F15: true,
+		},
+	}))
+	assertEqual(t, "b1791ccd1b346c3ede5bbffda85555adcd8216b93ffca23f14fe175ec47c5104", noErrStructHash(t, t1_2{
+		SV1: &t1_1{},
+		SV2: &t1_1{},
+		SV3: t1_1{
+			F10: 5,
+			F12: 6,
+			F15: false,
+		},
+	}))
+
+}
+
+func TestStructHashMap(t *testing.T) {
+
+	type t0 struct {
+		F1 int
+		F2 map[string]int
+	}
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: map[string]int{
+			"x": 1,
+			"0": 2,
+			"a": 99,
+		},
+	}))
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: map[string]int{
+			"a": 99,
+			"x": 1,
+			"0": 2,
+		},
+	}))
+
+	m3 := make(map[string]int, 99)
+	m3["a"] = 0
+	m3["x"] = 0
+	m3["0"] = 0
+
+	m3["0"] = 99
+	m3["x"] = 1
+	m3["a"] = 2
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: m3,
+	}))
+
+}
+
+func assertEqual(t *testing.T, expected string, actual []byte) {
+	actualStr := hex.EncodeToString(actual)
+	if actualStr != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actualStr, expected)
+	}
+}

go.mod

@@ -6,3 +6,5 @@ require (
 	golang.org/x/sys v0.1.0
 	golang.org/x/term v0.1.0
 )
+
+require github.com/jmoiron/sqlx v1.3.5 // indirect

go.sum

@@ -1,3 +1,8 @@
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jmoiron/sqlx v1.3.5 h1:vFFPA71p1o5gAeqtEAwLU4dnX2napprKtHr7PYIcN3g=
+github.com/jmoiron/sqlx v1.3.5/go.mod h1:nRVWtLre0KfCLJvgxzCsLVMogSvQ1zNJtpYr2Ccp0mQ=
+github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=

langext/array.go

@@ -70,7 +70,73 @@ func ArrEqualsExact[T comparable](arr1 []T, arr2 []T) bool {
 	return true
 }
 
-func ArrAll(arr interface{}, fn func(int) bool) bool {
+func ArrAll[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if !fn(av) {
+			return false
+		}
+	}
+	return true
+}
+
+func ArrAllErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if !v {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func ArrNone[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if fn(av) {
+			return false
+		}
+	}
+	return true
+}
+
+func ArrNoneErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if v {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func ArrAny[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if fn(av) {
+			return true
+		}
+	}
+	return false
+}
+
+func ArrAnyErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if v {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func ArrIdxAll(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if !fn(i) {
@@ -80,7 +146,7 @@ func ArrAll(arr interface{}, fn func(int) bool) bool {
 	return true
 }
 
-func ArrAllErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxAllErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -94,7 +160,7 @@ func ArrAllErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return true, nil
 }
 
-func ArrNone(arr interface{}, fn func(int) bool) bool {
+func ArrIdxNone(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if fn(i) {
@@ -104,7 +170,7 @@ func ArrNone(arr interface{}, fn func(int) bool) bool {
 	return true
 }
 
-func ArrNoneErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxNoneErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -118,7 +184,7 @@ func ArrNoneErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return true, nil
 }
 
-func ArrAny(arr interface{}, fn func(int) bool) bool {
+func ArrIdxAny(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if fn(i) {
@@ -128,7 +194,7 @@ func ArrAny(arr interface{}, fn func(int) bool) bool {
 	return false
 }
 
-func ArrAnyErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxAnyErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -142,7 +208,7 @@ func ArrAnyErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return false, nil
 }
 
-func ArrFirst[T comparable](arr []T, comp func(v T) bool) (T, bool) {
+func ArrFirst[T any](arr []T, comp func(v T) bool) (T, bool) {
 	for _, v := range arr {
 		if comp(v) {
 			return v, true
@@ -151,7 +217,7 @@ func ArrFirst[T comparable](arr []T, comp func(v T) bool) (T, bool) {
 	return *new(T), false
 }
 
-func ArrLast[T comparable](arr []T, comp func(v T) bool) (T, bool) {
+func ArrLast[T any](arr []T, comp func(v T) bool) (T, bool) {
 	found := false
 	result := *new(T)
 	for _, v := range arr {

langext/string.go

@@ -107,3 +107,11 @@ func NumToStringOpt[V IntConstraint](v *V, fallback string) string {
 		return fmt.Sprintf("%d", v)
 	}
 }
+
+func StrRepeat(val string, count int) string {
+	r := ""
+	for i := 0; i < count; i++ {
+		r += val
+	}
+	return r
+}

sq/database.go

@@ -0,0 +1,89 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+	"sync"
+)
+
+type DB interface {
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+	Ping(ctx context.Context) error
+	BeginTransaction(ctx context.Context, iso sql.IsolationLevel) (Tx, error)
+	SetListener(listener Listener)
+}
+
+type database struct {
+	db    *sqlx.DB
+	txctr uint16
+	lock  sync.Mutex
+	lstr  Listener
+}
+
+func NewDB(db *sqlx.DB) DB {
+	return &database{
+		db:    db,
+		txctr: 0,
+		lock:  sync.Mutex{},
+	}
+}
+
+func (db *database) SetListener(listener Listener) {
+	db.lstr = listener
+}
+
+func (db *database) Exec(ctx context.Context, sql string, prep PP) (sql.Result, error) {
+	if db.lstr != nil {
+		db.lstr.OnExec(nil, sql, &prep)
+	}
+
+	res, err := db.db.NamedExecContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+func (db *database) Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error) {
+	if db.lstr != nil {
+		db.lstr.OnQuery(nil, sql, &prep)
+	}
+
+	rows, err := db.db.NamedQueryContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return rows, nil
+}
+
+func (db *database) Ping(ctx context.Context) error {
+	if db.lstr != nil {
+		db.lstr.OnPing()
+	}
+
+	err := db.db.PingContext(ctx)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (db *database) BeginTransaction(ctx context.Context, iso sql.IsolationLevel) (Tx, error) {
+	db.lock.Lock()
+	txid := db.txctr
+	db.txctr += 1 // with overflow !
+	db.lock.Unlock()
+
+	if db.lstr != nil {
+		db.lstr.OnTxBegin(txid)
+	}
+
+	xtx, err := db.db.BeginTxx(ctx, &sql.TxOptions{Isolation: iso})
+	if err != nil {
+		return nil, err
+	}
+
+	return NewTransaction(xtx, txid, db.lstr), nil
+}

sq/listener.go

@@ -0,0 +1,10 @@
+package sq
+
+type Listener interface {
+	OnQuery(txID *uint16, sql string, params *PP)
+	OnExec(txID *uint16, sql string, params *PP)
+	OnPing()
+	OnTxBegin(txid uint16)
+	OnTxCommit(txid uint16)
+	OnTxRollback(txid uint16)
+}

sq/params.go

@@ -0,0 +1,3 @@
+package sq
+
+type PP map[string]any

sq/queryable.go

@@ -0,0 +1,12 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+)
+
+type Queryable interface {
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+}

sq/scanner.go

@@ -0,0 +1,52 @@
+package sq
+
+import (
+	"database/sql"
+	"errors"
+	"github.com/jmoiron/sqlx"
+)
+
+func ScanSingle[TData any](rows *sqlx.Rows, close bool) (TData, error) {
+	if rows.Next() {
+		var data TData
+		err := rows.StructScan(&data)
+		if err != nil {
+			return *new(TData), err
+		}
+		if rows.Next() {
+			_ = rows.Close()
+			return *new(TData), errors.New("sql returned more than onw row")
+		}
+		if close {
+			err = rows.Close()
+			if err != nil {
+				return *new(TData), err
+			}
+		}
+		return data, nil
+	} else {
+		if close {
+			_ = rows.Close()
+		}
+		return *new(TData), sql.ErrNoRows
+	}
+}
+
+func ScanAll[TData any](rows *sqlx.Rows, close bool) ([]TData, error) {
+	res := make([]TData, 0)
+	for rows.Next() {
+		var data TData
+		err := rows.StructScan(&data)
+		if err != nil {
+			return nil, err
+		}
+		res = append(res, data)
+	}
+	if close {
+		err := rows.Close()
+		if err != nil {
+			return nil, err
+		}
+	}
+	return res, nil
+}

sq/transaction.go

@@ -0,0 +1,69 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+)
+
+type Tx interface {
+	Rollback() error
+	Commit() error
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+}
+
+type transaction struct {
+	tx   *sqlx.Tx
+	id   uint16
+	lstr Listener
+}
+
+func NewTransaction(xtx *sqlx.Tx, txid uint16, lstr Listener) Tx {
+	return &transaction{
+		tx:   xtx,
+		id:   txid,
+		lstr: lstr,
+	}
+}
+
+func (tx *transaction) Rollback() error {
+	if tx.lstr != nil {
+		tx.lstr.OnTxRollback(tx.id)
+	}
+
+	return tx.tx.Rollback()
+}
+
+func (tx *transaction) Commit() error {
+	if tx.lstr != nil {
+		tx.lstr.OnTxCommit(tx.id)
+	}
+
+	return tx.tx.Commit()
+}
+
+func (tx *transaction) Exec(ctx context.Context, sql string, prep PP) (sql.Result, error) {
+	if tx.lstr != nil {
+		tx.lstr.OnExec(langext.Ptr(tx.id), sql, &prep)
+	}
+
+	res, err := tx.tx.NamedExecContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+func (tx *transaction) Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error) {
+	if tx.lstr != nil {
+		tx.lstr.OnQuery(langext.Ptr(tx.id), sql, &prep)
+	}
+
+	rows, err := sqlx.NamedQueryContext(ctx, tx.tx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return rows, nil
+}

syncext/atomic.go

@@ -0,0 +1,104 @@
+package syncext
+
+import (
+	"context"
+	"sync/atomic"
+	"time"
+)
+
+type AtomicBool struct {
+	v      int32
+	waiter chan bool // unbuffered
+}
+
+func NewAtomicBool(value bool) *AtomicBool {
+	if value {
+		return &AtomicBool{v: 1, waiter: make(chan bool)}
+	} else {
+		return &AtomicBool{v: 0, waiter: make(chan bool)}
+	}
+}
+
+func (a *AtomicBool) Get() bool {
+	return atomic.LoadInt32(&a.v) == 1
+}
+
+func (a *AtomicBool) Set(value bool) {
+	if value {
+		atomic.StoreInt32(&a.v, 1)
+	} else {
+		atomic.StoreInt32(&a.v, 0)
+	}
+
+	select {
+	case a.waiter <- value:
+		// message sent
+	default:
+		// no receiver on channel
+	}
+}
+
+func (a *AtomicBool) Wait(waitFor bool) {
+	if a.Get() == waitFor {
+		return
+	}
+
+	for {
+		if v, ok := ReadChannelWithTimeout(a.waiter, 128*time.Millisecond); ok {
+			if v == waitFor {
+				return
+			}
+		} else {
+			if a.Get() == waitFor {
+				return
+			}
+		}
+	}
+}
+
+func (a *AtomicBool) WaitWithTimeout(timeout time.Duration, waitFor bool) error {
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	return a.WaitWithContext(ctx, waitFor)
+}
+
+func (a *AtomicBool) WaitWithContext(ctx context.Context, waitFor bool) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	if a.Get() == waitFor {
+		return nil
+	}
+
+	for {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+
+		timeOut := 128 * time.Millisecond
+
+		if dl, ok := ctx.Deadline(); ok {
+			timeOutMax := dl.Sub(time.Now())
+			if timeOutMax <= 0 {
+				timeOut = 0
+			} else if 0 < timeOutMax && timeOutMax < timeOut {
+				timeOut = timeOutMax
+			}
+		}
+
+		if v, ok := ReadChannelWithTimeout(a.waiter, timeOut); ok {
+			if v == waitFor {
+				return nil
+			}
+		} else {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+
+			if a.Get() == waitFor {
+				return nil
+			}
+		}
+	}
+}

syncext/channel.go

@@ -0,0 +1,45 @@
+package syncext
+
+import (
+	"time"
+)
+
+// https://gobyexample.com/non-blocking-channel-operations
+// https://gobyexample.com/timeouts
+// https://groups.google.com/g/golang-nuts/c/Oth9CmJPoqo
+
+func ReadChannelWithTimeout[T any](c chan T, timeout time.Duration) (T, bool) {
+	select {
+	case msg := <-c:
+		return msg, true
+	case <-time.After(timeout):
+		return *new(T), false
+	}
+}
+
+func WriteChannelWithTimeout[T any](c chan T, msg T, timeout time.Duration) bool {
+	select {
+	case c <- msg:
+		return true
+	case <-time.After(timeout):
+		return false
+	}
+}
+
+func ReadNonBlocking[T any](c chan T) (T, bool) {
+	select {
+	case msg := <-c:
+		return msg, true
+	default:
+		return *new(T), false
+	}
+}
+
+func WriteNonBlocking[T any](c chan T, msg T) bool {
+	select {
+	case c <- msg:
+		return true
+	default:
+		return false
+	}
+}

syncext/channel_test.go

@@ -0,0 +1,121 @@
+package syncext
+
+import (
+	"testing"
+	"time"
+)
+
+func TestTimeoutReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestTimeoutReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestTimeoutReadUnbuffered(t *testing.T) {
+	c := make(chan int)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestNoTimeoutAfterStartReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutAfterStartReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutAfterStartReadUnbuffered(t *testing.T) {
+	c := make(chan int)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+
+}
+
+func TestNoTimeoutBeforeStartReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	c <- 112
+
+	_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutBeforeStartReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	c <- 112
+
+	_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}

timeext/duration.go

@@ -2,59 +2,36 @@ package timeext
 
 import (
 	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"time"
 )
 
-func FromSeconds(v int) time.Duration {
+func FromNanoseconds[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v) * int64(time.Second))
+	return time.Duration(int64(float64(v) * float64(time.Nanosecond)))
 }
 
-func FromSecondsInt32(v int32) time.Duration {
+func FromMicroseconds[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v) * int64(time.Second))
+	return time.Duration(int64(float64(v) * float64(time.Microsecond)))
 }
 
-func FromSecondsInt64(v int64) time.Duration {
+func FromMilliseconds[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(v * int64(time.Second))
+	return time.Duration(int64(float64(v) * float64(time.Millisecond)))
 }
 
-func FromSecondsFloat32(v float32) time.Duration {
+func FromSeconds[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v * float32(time.Second)))
+	return time.Duration(int64(float64(v) * float64(time.Second)))
 }
 
-func FromSecondsFloat64(v float64) time.Duration {
+func FromMinutes[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v * float64(time.Second)))
+	return time.Duration(int64(float64(v) * float64(time.Minute)))
 }
 
-func FromSecondsFloat(v float64) time.Duration {
+func FromHours[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v * float64(time.Second)))
+	return time.Duration(int64(float64(v) * float64(time.Hour)))
 }
 
-func FromMinutes(v int) time.Duration {
+func FromDays[T langext.NumberConstraint](v T) time.Duration {
-	return time.Duration(int64(v) * int64(time.Minute))
+	return time.Duration(int64(float64(v) * float64(24) * float64(time.Hour)))
-}
-
-func FromMinutesFloat(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Minute)))
-}
-
-func FromMinutesFloat64(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Minute)))
-}
-
-func FromHoursFloat64(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Hour)))
-}
-
-func FromDays(v int) time.Duration {
-	return time.Duration(int64(v) * int64(24) * int64(time.Hour))
-}
-
-func FromMilliseconds(v int) time.Duration {
-	return time.Duration(int64(v) * int64(time.Millisecond))
-}
-
-func FromMillisecondsFloat(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Millisecond)))
 }
 
 func FormatNaturalDurationEnglish(iv time.Duration) string {

timeext/parser.go

@@ -0,0 +1,152 @@
+package timeext
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var durationShortStringMap = map[string]time.Duration{
+	"ns":          time.Nanosecond,
+	"nanosecond":  time.Nanosecond,
+	"nanoseconds": time.Nanosecond,
+
+	"us":           time.Microsecond,
+	"microsecond":  time.Microsecond,
+	"microseconds": time.Microsecond,
+
+	"ms":           time.Millisecond,
+	"millisecond":  time.Millisecond,
+	"milliseconds": time.Millisecond,
+
+	"s":       time.Second,
+	"sec":     time.Second,
+	"second":  time.Second,
+	"seconds": time.Second,
+
+	"m":       time.Minute,
+	"min":     time.Minute,
+	"minute":  time.Minute,
+	"minutes": time.Minute,
+
+	"h":     time.Hour,
+	"hour":  time.Hour,
+	"hours": time.Hour,
+
+	"d":    24 * time.Hour,
+	"day":  24 * time.Hour,
+	"days": 24 * time.Hour,
+
+	"w":     7 * 24 * time.Hour,
+	"wk":    7 * 24 * time.Hour,
+	"week":  7 * 24 * time.Hour,
+	"weeks": 7 * 24 * time.Hour,
+}
+
+// ParseDurationShortString parses a duration in string format to a time.Duration
+// Examples for allowed formats:
+//   - '10m'
+//   - '10min'
+//   - '1minute'
+//   - '10minutes'
+//   - '10.5minutes'
+//   - '50s'
+//   - '50sec'
+//   - '1second'
+//   - '50seconds'
+//   - '100ms'
+//   - '100millisseconds'
+//   - '1h'
+//   - '1hour'
+//   - '2hours'
+//   - '1d'
+//   - '1day'
+//   - '10days'
+//   - '1d10m'
+//   - '1d10m200sec'
+//   - '1d:10m'
+//   - '1d 10m'
+//   - '1d,10m'
+func ParseDurationShortString(s string) (time.Duration, error) {
+	s = strings.ToLower(s)
+
+	segments := make([]string, 0)
+	collector := ""
+
+	prevWasNum := true
+	for _, chr := range s {
+		if chr >= '0' && chr <= '9' || chr == '.' {
+			if prevWasNum {
+				collector += string(chr)
+			} else {
+				segments = append(segments, collector)
+				prevWasNum = true
+				collector = string(chr)
+			}
+		} else if chr == ' ' || chr == ':' || chr == ',' {
+			continue
+		} else if chr >= 'a' && chr <= 'z' {
+			prevWasNum = false
+			collector += string(chr)
+		} else {
+			return 0, errors.New("unexpected character: " + string(chr))
+		}
+	}
+	if !prevWasNum {
+		segments = append(segments, collector)
+	}
+
+	result := time.Duration(0)
+	for _, seg := range segments {
+		segDur, err := parseDurationShortStringSegment(seg)
+		if err != nil {
+			return 0, err
+		}
+		result += segDur
+	}
+	return result, nil
+}
+
+func parseDurationShortStringSegment(segment string) (time.Duration, error) {
+	num := ""
+	unit := ""
+
+	part0 := true
+	for _, chr := range segment {
+		if part0 {
+
+			if chr >= 'a' && chr <= 'z' {
+				part0 = false
+				unit += string(chr)
+			} else if chr >= '0' && chr <= '9' || chr == '.' {
+				num += string(chr)
+			} else {
+				return 0, errors.New(fmt.Sprintf("Unexpected character '%s' in segment [%s]", string(chr), segment))
+			}
+
+		} else {
+
+			if chr >= 'a' && chr <= 'z' {
+				unit += string(chr)
+			} else if chr >= '0' && chr <= '9' || chr == '.' {
+				return 0, errors.New(fmt.Sprintf("Unexpected number '%s' in segment [%s]", string(chr), segment))
+			} else {
+				return 0, errors.New(fmt.Sprintf("Unexpected character '%s' in segment [%s]", string(chr), segment))
+			}
+
+		}
+	}
+
+	fpnum, err := strconv.ParseFloat(num, 64)
+	if err != nil {
+		return 0, errors.New(fmt.Sprintf("Failed to parse floating-point number '%s' in segment [%s]", num, segment))
+	}
+
+	if mult, ok := durationShortStringMap[unit]; ok {
+		return time.Duration(int64(fpnum * float64(mult))), nil
+	} else {
+		return 0, errors.New(fmt.Sprintf("Unknown unit '%s' in segment [%s]", unit, segment))
+	}
+}

timeext/parser_test.go

@@ -0,0 +1,70 @@
+package timeext
+
+import (
+	"testing"
+	"time"
+)
+
+func TestParseDurationShortString(t *testing.T) {
+
+	assertPDSSEqual(t, FromSeconds(1), "1s")
+	assertPDSSEqual(t, FromSeconds(1), "1sec")
+	assertPDSSEqual(t, FromSeconds(1), "1second")
+	assertPDSSEqual(t, FromSeconds(1), "1seconds")
+	assertPDSSEqual(t, FromSeconds(100), "100second")
+	assertPDSSEqual(t, FromSeconds(100), "100seconds")
+	assertPDSSEqual(t, FromSeconds(1883639.77), "1883639.77second")
+	assertPDSSEqual(t, FromSeconds(1883639.77), "1883639.77seconds")
+	assertPDSSEqual(t, FromSeconds(50), "50s")
+	assertPDSSEqual(t, FromSeconds(50), "50sec")
+	assertPDSSEqual(t, FromSeconds(1), "1second")
+	assertPDSSEqual(t, FromSeconds(50), "50seconds")
+
+	assertPDSSEqual(t, FromMinutes(10), "10m")
+	assertPDSSEqual(t, FromMinutes(10), "10min")
+	assertPDSSEqual(t, FromMinutes(1), "1minute")
+	assertPDSSEqual(t, FromMinutes(10), "10minutes")
+	assertPDSSEqual(t, FromMinutes(10.5), "10.5minutes")
+
+	assertPDSSEqual(t, FromMilliseconds(100), "100ms")
+	assertPDSSEqual(t, FromMilliseconds(100), "100milliseconds")
+	assertPDSSEqual(t, FromMilliseconds(100), "100millisecond")
+
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235ns")
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235nanoseconds")
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235nanosecond")
+
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235us")
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235microseconds")
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235microsecond")
+
+	assertPDSSEqual(t, FromHours(1), "1h")
+	assertPDSSEqual(t, FromHours(1), "1hour")
+	assertPDSSEqual(t, FromHours(2), "2hours")
+
+	assertPDSSEqual(t, FromDays(1), "1d")
+	assertPDSSEqual(t, FromDays(1), "1day")
+	assertPDSSEqual(t, FromDays(10), "10days")
+	assertPDSSEqual(t, FromDays(1), "1days")
+	assertPDSSEqual(t, FromDays(10), "10day")
+
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10)+FromSeconds(200), "1d10m200sec")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d:10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d 10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d,10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d, 10m")
+	assertPDSSEqual(t, FromDays(1)+FromSeconds(1000), "1d   1000seconds")
+
+	assertPDSSEqual(t, FromDays(1), "86400s")
+}
+
+func assertPDSSEqual(t *testing.T, expected time.Duration, fmt string) {
+	actual, err := ParseDurationShortString(fmt)
+	if err != nil {
+		t.Errorf("ParseDurationShortString('%s') failed with %v", fmt, err)
+	}
+	if actual != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual.String(), expected.String())
+	}
+}