.golangci.yml

@@ -70,3 +70,6 @@ issues:
       linters:
         - lll
         - goerr113
+    - path: example/*
+      linters:
+        - gomnd

entry/entry.go

@@ -161,3 +161,24 @@ func (e *Entry) AddAny(key string, value interface{}) *Entry {
 func (e *Entry) AddString(key, value string) *Entry {
 	return e.Add(field.String(key, value))
 }
+
+func (e *Entry) Replace(key string, value field.Value) *Entry {
+	has := false
+
+	e.fields.Fields(func(f field.Field) bool {
+		if f.Key == key {
+			f.Value = value
+			has = true
+
+			return false
+		}
+
+		return true
+	})
+
+	if !has {
+		e.AddAny(key, value)
+	}
+
+	return e
+}

example/log.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/field"
+)
+
+func main() {
+	ctx := context.Background()
+
+	log.DebugKV(ctx, "debug message")
+	log.ErrKV(ctx, "error message")
+	log.Errf(ctx, "format error message:%v", 42)
+	log.Err(ctx, "error message", 42)
+	service(ctx, log.Log())
+
+	logger := log.New(log.WithJSONFormat()).With(log.WithSource(10, log.TrimPath))
+	logger.AlertKV(ctx, "alert message new logger", field.String("string", "value"))
+	service(ctx, logger)
+}
+
+func service(ctx context.Context, logger log.Logger) {
+	logger = logger.With(log.WithName("service"))
+	logger.WarnKV(ctx, "warn service message")
+	otherService(ctx, logger)
+}
+
+func otherService(ctx context.Context, logger log.Logger) {
+	logger = logger.With(log.WithName("other_service"))
+	logger.WarnKV(ctx, "warn other service message")
+}

global.go

@@ -8,9 +8,9 @@ import (
 	"gitoa.ru/go-4devs/log/level"
 )
 
-//nolint:gochecknoglobals
+//nolint:gochecknoglobals,gomnd
 var global = With(New(),
-	WithSource(2),
+	WithSource(2, TrimPath),
 	WithLevel(KeyLevel, level.Debug),
 	WithExit(level.Alert),
 	WithPanic(level.Emergency),

global_example_test.go

@@ -2,14 +2,15 @@ package log_test
 
 import (
 	"context"
+	"path/filepath"
 
 	"gitoa.ru/go-4devs/log"
 	"gitoa.ru/go-4devs/log/level"
 )
 
 func ExampleDebug() {
-	logger := log.With(log.New(log.WithStdout()),
-		log.WithSource(2),
+	logger := log.New(log.WithStdout()).With(
+		log.WithSource(2, filepath.Base),
 		log.WithLevel(log.KeyLevel, level.Debug),
 		log.WithExit(level.Alert),
 		log.WithPanic(level.Emergency),
@@ -20,5 +21,5 @@ func ExampleDebug() {
 	ctx := context.Background()
 	log.Debug(ctx, "debug message")
 	// Output:
-	// msg="debug message" source=global_example_test.go:21 level=debug
+	// msg="debug message" source=global_example_test.go:22 level=debug
 }

logger_example_caller_test.go

@@ -1,22 +1,23 @@
 package log_test
 
 import (
+	"path/filepath"
+
 	"gitoa.ru/go-4devs/log"
 	"gitoa.ru/go-4devs/log/level"
 )
 
 func ExampleNew_withCaller() {
-	logger := log.With(
-		log.New(log.WithStdout()),
-		log.WithLevel("level", level.Debug),
-		log.WithSource(3),
+	logger := log.New(log.WithStdout()).With(
+		log.WithLevel(log.KeyLevel, level.Debug),
+		log.WithSource(3, filepath.Base),
 	)
 	logger.Err(ctx, "same error message")
 	logger.InfoKVs(ctx, "same info message", "api-version", 0.1)
 	_, _ = logger.Write([]byte("same write message"))
 
 	// Output:
-	// msg="same error message" level=error source=logger_example_caller_test.go:14
-	// msg="same info message" api-version=0.1 level=info source=logger_example_caller_test.go:15
-	// msg="same write message" level=info source=logger_example_caller_test.go:16
+	// msg="same error message" level=error source=logger_example_caller_test.go:15
+	// msg="same info message" api-version=0.1 level=info source=logger_example_caller_test.go:16
+	// msg="same write message" level=info source=logger_example_caller_test.go:17
 }

logger_example_test.go

@@ -47,19 +47,19 @@ func ExampleNew_errf() {
 }
 
 func ExampleNew_debugKV() {
-	logger := log.New(log.WithStdout()).With(log.WithLevel("level", level.Debug))
+	logger := log.New(log.WithStdout()).With(log.WithLevel(log.KeyLevel, level.Debug))
 	logger.DebugKVs(ctx, "same message", "error", os.ErrNotExist)
 	// Output: msg="same message" error="file does not exist" level=debug
 }
 
 func ExampleNew_level() {
-	logger := log.New(log.WithStdout()).With(log.WithLevel("level", level.Error))
+	logger := log.New(log.WithStdout()).With(log.WithLevel(log.KeyLevel, level.Error))
 	logger.Err(ctx, "same error message")
 	// Output: msg="same error message" level=error
 }
 
 func ExampleNew_level_info() {
-	logger := log.New(log.WithStdout()).With(log.WithLevel("level", level.Error))
+	logger := log.New(log.WithStdout()).With(log.WithLevel(log.KeyLevel, level.Error))
 	logger.Info(ctx, "same message")
 	// Output:
 }
@@ -218,8 +218,8 @@ func ExampleNew_jsonFormat() {
 }
 
 func ExampleNew_textEncoding() {
-	logger := log.With(
-		log.New(log.WithStdout()),
+	logger := log.New(log.WithStdout()).
+		With(
 			log.WithLevel(log.KeyLevel, level.Debug),
 			log.GoVersion("go-version"),
 		)
@@ -238,25 +238,29 @@ func (c ctxKey) String() string {
 }
 
 func levelInfo(ctx context.Context, entry *entry.Entry, handler log.Logger) (int, error) {
-	return handler(ctx, entry.Add(field.String("level", entry.Level().String())))
+	return handler(ctx, entry.Add(field.String(log.KeyLevel, entry.Level().String())))
 }
 
 func ExampleWith() {
 	var requestID ctxKey = "requestID"
 	vctx := context.WithValue(ctx, requestID, "6a5fa048-7181-11ea-bc55-0242ac130003")
 
-	logger := log.With(
-		log.New(log.WithStdout()),
-		levelInfo, log.WithContextValue(requestID), log.KeyValue("api", "0.1.0"), log.GoVersion("go"),
+	logger := log.New(log.WithStdout()).With(
+		levelInfo,
+		log.WithContextValue(requestID),
+		log.KeyValue("api", "0.1.0"),
+		log.GoVersion("go"),
 	)
 	logger.Info(vctx, "same message")
 	// Output: msg="same message" level=info requestID=6a5fa048-7181-11ea-bc55-0242ac130003 api=0.1.0 go=go1.21.5
 }
 
 func ExampleLogger_Print() {
-	logger := log.With(
-		log.New(log.WithStdout()),
-		levelInfo, log.KeyValue("client", "http"), log.KeyValue("api", "0.1.0"), log.GoVersion("go"),
+	logger := log.New(log.WithStdout()).With(
+		levelInfo,
+		log.KeyValue("client", "http"),
+		log.KeyValue("api", "0.1.0"),
+		log.GoVersion("go"),
 	)
 	logger.Print("same message")
 	// Output: msg="same message" level=info client=http api=0.1.0 go=go1.21.5
@@ -277,7 +281,7 @@ func Example_fieldClosureFn() {
 		return d
 	})
 
-	log := log.With(log.New(log.WithStdout()), log.WithLevel("level", level.Info))
+	log := log.New(log.WithStdout()).With(log.WithLevel(log.KeyLevel, level.Info))
 
 	log.DebugKVs(ctx, "debug message", "data", closure)
 	log.ErrKVs(ctx, "error message", "err", closure)
@@ -289,7 +293,9 @@ func Example_fieldClosureFn() {
 }
 
 func Example_withGroup() {
-	log := log.With(log.New(log.WithStdout()), log.WithLevel(log.KeyLevel, level.Info))
+	log := log.New(log.WithStdout()).With(
+		log.WithLevel(log.KeyLevel, level.Info),
+	)
 
 	log.ErrKVs(ctx, "error message",
 		field.Groups("grous_field",

logger_test.go

@@ -27,7 +27,7 @@ func TestFields(t *testing.T) {
 	ctx := context.Background()
 	buf := &bytes.Buffer{}
 	log := log.New(log.WithWriter(buf)).
-		With(log.WithLevel("level", level.Info))
+		With(log.WithLevel(log.KeyLevel, level.Info))
 	success := "msg=message err=\"file already exists\" version=0.1.0 obj={id:uid} closure=\"some closure data\" level=info\n"
 
 	log.InfoKVs(ctx, "message",
@@ -65,7 +65,7 @@ func TestWriter(t *testing.T) {
 
 	success := "msg=\"info message\" err=\"file already exists\" requestID=6a5fa048-7181-11ea-bc55-0242ac1311113 level=info\n"
 	buf := &bytes.Buffer{}
-	logger := log.New(log.WithWriter(buf)).With(log.WithContextValue(requestID), log.WithLevel("level", level.Info))
+	logger := log.New(log.WithWriter(buf)).With(log.WithContextValue(requestID), log.WithLevel(log.KeyLevel, level.Info))
 
 	_, _ = logger.Writer(
 		context.WithValue(ctx, requestID, "6a5fa048-7181-11ea-bc55-0242ac1311113"),
@@ -91,7 +91,7 @@ func TestLogger(t *testing.T) {
 
 	ctx := context.Background()
 	buf := &bytes.Buffer{}
-	logger := log.New(log.WithWriter(buf)).With(log.WithContextValue(requestID), log.WithLevel("level", level.Info))
+	logger := log.New(log.WithWriter(buf)).With(log.WithContextValue(requestID), log.WithLevel(log.KeyLevel, level.Info))
 
 	_, err := logger(ctx, nil)
 	if err != nil {

middleware.go

@@ -85,6 +85,12 @@ func WithContextValue(keys ...fmt.Stringer) Middleware {
 	}
 }
 
+func WithName(name string) Middleware {
+	return func(ctx context.Context, data *entry.Entry, handler Logger) (int, error) {
+		return handler(ctx, data.Replace(KeyName, field.StringValue(name)))
+	}
+}
+
 // WithCaller adds called file.
 // Deprecated: use WithSource.
 func WithCaller(key string, depth int, full bool) Middleware {

source.go

@@ -5,28 +5,73 @@ import (
 	"fmt"
 	"path/filepath"
 	"runtime"
+	"strings"
 
 	"gitoa.ru/go-4devs/log/entry"
 	"gitoa.ru/go-4devs/log/field"
 )
 
-func WithSource(depth int) Middleware {
-	const offset = 3
+func WithSource(items int, trimPath func(string) string) Middleware {
+	const (
+		skip       = 4
+		funcPrefix = "gitoa.ru/go-4devs/log.Logger"
+		skipHelper = "gitoa.ru/go-4devs/log."
+	)
+
+	items += skip
 
 	return func(ctx context.Context, data *entry.Entry, handler Logger) (int, error) {
-		pc, file, line, has := runtime.Caller(depth + offset)
-		if !has {
-			return handler(ctx, data.AddAny(KeyLevel, field.NilValue()))
+		pc := make([]uintptr, items)
+		n := runtime.Callers(skip, pc)
+
+		if n == 0 {
+			return handler(ctx, data.Add(errSourceField(skip, items)))
 		}
 
-		fnc := runtime.FuncForPC(pc)
+		pc = pc[:n] // pass only valid pcs to runtime.CallersFrames
+		frames := runtime.CallersFrames(pc)
+		prew := false
+
+		for {
+			frame, more := frames.Next()
+
+			has := strings.HasPrefix(frame.Function, funcPrefix)
+			if !has && prew {
+				if strings.HasPrefix(frame.Function, skipHelper) {
+					continue
+				}
 
 				return handler(ctx, data.AddAny(KeySource, Source{
-			Func: filepath.Base(fnc.Name()),
-			File: filepath.Base(file),
-			Line: line,
+					Func: filepath.Base(frame.Function),
+					Line: frame.Line,
+					File: trimPath(frame.File),
 				}))
 			}
+
+			prew = has
+
+			if !more {
+				break
+			}
+		}
+
+		return handler(ctx, data.Add(errSourceField(skip, items)))
+	}
+}
+
+func TrimPath(file string) string {
+	idx := strings.LastIndexByte(file, '/')
+	if idx == -1 {
+		return filepath.Base(file)
+	}
+
+	// Find the penultimate separator.
+	idx = strings.LastIndexByte(file[:idx], '/')
+	if idx == -1 {
+		return filepath.Base(file)
+	}
+
+	return file[idx+1:]
 }
 
 // Source describes the location of a line of source code.
@@ -43,3 +88,7 @@ func (l Source) MarshalText() ([]byte, error) {
 func (l Source) MarshalJSON() ([]byte, error) {
 	return fmt.Appendf([]byte{}, `{"file":"%s","line":%d,"func":"%s"}`, l.File, l.Line, l.Func), nil
 }
+
+func errSourceField(skip, max int) field.Field {
+	return field.String(KeySource, fmt.Sprintf("source not found by frames[%d:%d]", skip, max))
+}

source_example_test.go

@@ -2,24 +2,25 @@ package log_test
 
 import (
 	"context"
+	"path/filepath"
 
 	"gitoa.ru/go-4devs/log"
 )
 
 func ExampleWithSource() {
 	ctx := context.Background()
-	logger := log.New(log.WithStdout()).With(log.WithSource(1))
+	logger := log.New(log.WithStdout()).With(log.WithSource(1, filepath.Base))
 
 	logger.Debug(ctx, "debug message")
 	// Output:
-	// msg="debug message" source=source_example_test.go:13
+	// msg="debug message" source=source_example_test.go:14
 }
 
 func ExampleWithSource_json() {
 	ctx := context.Background()
-	logger := log.New(log.WithStdout(), log.WithJSONFormat()).With(log.WithSource(1))
+	logger := log.New(log.WithStdout(), log.WithJSONFormat()).With(log.WithSource(2, filepath.Base))
 
 	logger.Debug(ctx, "debug message")
 	// Output:
-	// {"msg":"debug message","source":{"file":"source_example_test.go","line":22,"func":"log_test.ExampleWithSource_json"}}
+	// {"msg":"debug message","source":{"file":"source_example_test.go","line":23,"func":"log_test.ExampleWithSource_json"}}
 }

writter.go

@@ -25,6 +25,8 @@ const (
 	// SourceKey is the key used by the built-in handlers for the source file
 	// and line of the log call. The associated value is a string.
 	KeySource = "source"
+	// KeyName logger name.
+	KeyName = "name"
 )
 
 func WithWriter(w io.Writer) func(*option) {