restore v0.3.0

bench_test.go

@@ -0,0 +1,177 @@
+package log_test
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"testing"
+	"time"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/field"
+)
+
+// nolint: gochecknoglobals
+var (
+	errExample  = errors.New("fail")
+	_messages   = fakeMessages(1000)
+	_tenInts    = []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0}
+	_tenStrings = []string{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j"}
+	_tenTimes   = []time.Time{
+		time.Unix(0, 0),
+		time.Unix(1, 0),
+		time.Unix(2, 0),
+		time.Unix(3, 0),
+		time.Unix(4, 0),
+		time.Unix(5, 0),
+		time.Unix(6, 0),
+		time.Unix(7, 0),
+		time.Unix(8, 0),
+		time.Unix(9, 0),
+	}
+	_oneUser = &user{
+		Name:      "Jane Doe",
+		Email:     "jane@test.com",
+		CreatedAt: time.Date(1980, 1, 1, 12, 0, 0, 0, time.UTC),
+	}
+	_tenUsers = users{
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+		_oneUser,
+	}
+)
+
+type user struct {
+	Name      string    `json:"name"`
+	Email     string    `json:"email"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+type users []*user
+
+func fakeMessages(n int) []string {
+	messages := make([]string, n)
+	for i := range messages {
+		messages[i] = fmt.Sprintf("Test logging, but use a somewhat realistic message length. (#%v)", i)
+	}
+
+	return messages
+}
+
+func getMessage(iter int) string {
+	return _messages[iter%1000]
+}
+
+func fakeFmtArgs() []interface{} {
+	// Need to keep this a function instead of a package-global var so that we
+	// pay the cast-to-interface{} penalty on each call.
+	return []interface{}{
+		_tenInts[0],
+		_tenInts,
+		_tenStrings[0],
+		_tenStrings,
+		_tenTimes[0],
+		_tenTimes,
+		_oneUser,
+		_oneUser,
+		_tenUsers,
+		errExample,
+	}
+}
+
+func fakeFields() []field.Field {
+	return []field.Field{
+		field.Int("int", _tenInts[0]),
+		field.Ints("ints", _tenInts...),
+		field.String("string", _tenStrings[0]),
+		field.Strings("strings", _tenStrings...),
+		field.Time("time", _tenTimes[0]),
+		field.Times("times", _tenTimes...),
+		field.Any("user1", _oneUser),
+		field.Any("user2", _oneUser),
+		field.Any("users", _tenUsers),
+		field.Error("err", errExample),
+	}
+}
+
+func fakeSugarFields() []interface{} {
+	return []interface{}{
+		"int", _tenInts[0],
+		"ints", _tenInts,
+		"string", _tenStrings[0],
+		"strings", _tenStrings,
+		"time", _tenTimes[0],
+		"times", _tenTimes,
+		"user1", _oneUser,
+		"user2", _oneUser,
+		"users", _tenUsers,
+		"error", errExample,
+	}
+}
+
+func NewLogger() log.Logger {
+	return log.New(log.WithWriter(ioutil.Discard))
+}
+
+func BenchmarkDisabledWithoutFields(b *testing.B) {
+	ctx := context.Background()
+	logger := NewLogger()
+
+	b.Run("4devs/log", func(b *testing.B) {
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				logger.Info(ctx, getMessage(0))
+			}
+		})
+	})
+	b.Run("4devs/log.Formatting", func(b *testing.B) {
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				logger.Infof(ctx, "%v %v %v %s %v %v %v %v %v %s\n", fakeFmtArgs()...)
+			}
+		})
+	})
+}
+
+func BenchmarkDisabledAccumulatedContext(b *testing.B) {
+	ctx := context.Background()
+	logger := NewLogger()
+
+	b.Run("4devs/log", func(b *testing.B) {
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				logger.InfoKV(ctx, getMessage(0), fakeFields()...)
+			}
+		})
+	})
+
+	b.Run("4devs/log.Sugar", func(b *testing.B) {
+		b.ResetTimer()
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				logger.InfoKVs(ctx, getMessage(1), fakeSugarFields()...)
+			}
+		})
+	})
+
+	b.Run("4devs/log.Context", func(b *testing.B) {
+		b.ResetTimer()
+		logger := NewLogger().With(log.GoVersion("goversion"))
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				logger.InfoKV(ctx, getMessage(0), fakeFields()...)
+			}
+		})
+	})
+}

entry/caller.go

@@ -0,0 +1,22 @@
+package entry
+
+import (
+	"path/filepath"
+	"runtime"
+	"strconv"
+)
+
+func Caller(depth int, full bool) string {
+	const offset = 4
+	_, file, line, ok := runtime.Caller(depth + offset)
+
+	if !ok {
+		file, line = "???", 0
+	}
+
+	if !full && ok {
+		file = filepath.Base(file)
+	}
+
+	return file + ":" + strconv.Itoa(line)
+}

entry/entry.go

@@ -0,0 +1,132 @@
+package entry
+
+import (
+	"strings"
+
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
+)
+
+const (
+	defaultCap = 5
+)
+
+type Option func(*Entry)
+
+func WithCapacity(cap int) Option {
+	return func(e *Entry) {
+		e.fields = make(field.Fields, 0, cap+1)
+	}
+}
+
+func WithFields(fields ...field.Field) Option {
+	return func(e *Entry) {
+		e.fields = fields
+	}
+}
+
+func WithMessage(msg string) Option {
+	return func(e *Entry) {
+		e.msg = msg
+	}
+}
+
+func WithLevel(lvl level.Level) Option {
+	return func(e *Entry) {
+		e.level = lvl
+	}
+}
+
+func New(opts ...Option) *Entry {
+	e := &Entry{
+		fields: make(field.Fields, 0, defaultCap+1),
+		level:  level.Debug,
+	}
+
+	for _, opt := range opts {
+		opt(e)
+	}
+
+	return e
+}
+
+// Entry slice field.
+type Entry struct {
+	msg    string
+	level  level.Level
+	fields field.Fields
+}
+
+func (e *Entry) Reset() {
+	e.fields = e.fields[:0]
+}
+
+func (e *Entry) Fields() field.Fields {
+	return e.fields
+}
+
+// String implement stringer.
+func (e *Entry) String() string {
+	if e == nil {
+		return ""
+	}
+
+	str := make([]string, len(e.fields)+1)
+	str[0] = e.msg
+
+	for i, field := range e.fields {
+		str[i+1] = field.String()
+	}
+
+	return strings.Join(str, " ")
+}
+
+func (e *Entry) Message() string {
+	return e.msg
+}
+
+func (e *Entry) Level() level.Level {
+	if e == nil {
+		return level.Debug
+	}
+
+	return e.level
+}
+
+func (e *Entry) SetLevel(level level.Level) *Entry {
+	if e == nil {
+		return New().SetLevel(level)
+	}
+
+	e.level = level
+
+	return e
+}
+
+func (e *Entry) SetMessage(msg string) *Entry {
+	if e == nil {
+		return New().SetMessage(msg)
+	}
+
+	e.msg = msg
+
+	return e
+}
+
+func (e *Entry) Add(fields ...field.Field) *Entry {
+	if e == nil {
+		return New(WithFields(fields...))
+	}
+
+	e.fields = e.fields.Append(fields...)
+
+	return e
+}
+
+func (e *Entry) AddAny(key string, value interface{}) *Entry {
+	return e.Add(field.Any(key, value))
+}
+
+func (e *Entry) AddString(key, value string) *Entry {
+	return e.Add(field.String(key, value))
+}

entry/pool.go

@@ -0,0 +1,21 @@
+package entry
+
+import "sync"
+
+// nolint: gochecknoglobals
+var pool = sync.Pool{
+	New: func() interface{} {
+		return New()
+	},
+}
+
+func Get() *Entry {
+	e := pool.Get().(*Entry)
+	e.Reset()
+
+	return e
+}
+
+func Put(e *Entry) {
+	pool.Put(e)
+}

field.go

@@ -1,40 +1,15 @@
 package log
 
 import (
-	"fmt"
-	"strings"
+	"gitoa.ru/go-4devs/log/field"
 )
 
-// Fields slice field.
-type Fields []Field
-
-// String implement stringer.
-func (f Fields) String() string {
-	str := make([]string, len(f))
-	for i, field := range f {
-		str[i] = field.String()
-	}
-
-	return strings.Join(str, " ")
-}
-
-// NewField create field.
-func NewField(key string, value interface{}) Field {
-	return Field{Key: key, Value: value}
-}
-
-// Field struct.
-type Field struct {
-	Key   string
-	Value interface{}
-}
-
-// String implent stringer.
-func (f Field) String() string {
-	return fmt.Sprintf("%s=%+v", f.Key, f.Value)
+// Field create field.
+func Field(key string, value interface{}) field.Field {
+	return field.Any(key, value)
 }
 
 // FieldError new errors field with key error.
-func FieldError(err error) Field {
-	return NewField("error", err)
+func FieldError(err error) field.Field {
+	return field.Error("error", err)
 }

field/encoder.go

@@ -0,0 +1,31 @@
+package field
+
+import "time"
+
+type Encoder interface {
+	// Built-in types.
+	AddArray(key string, value Value)
+	AddAny(key string, value Value)
+	AddNil(key string)
+	AddBool(key string, value bool)
+	AddBinary(key string, value []byte)
+	AddInt(key string, value int)
+	AddInt8(key string, value int8)
+	AddInt16(key string, value int16)
+	AddInt32(key string, value int32)
+	AddInt64(key string, value int64)
+	AddUint(key string, value uint)
+	AddUint8(key string, value uint8)
+	AddUint16(key string, value uint16)
+	AddUint32(key string, value uint32)
+	AddUint64(key string, value uint64)
+	AddUintptr(key string, value uintptr)
+	AddTime(key string, value time.Time)
+	AddDuration(key string, value time.Duration)
+	AddFloat32(key string, value float32)
+	AddFloat64(key string, value float64)
+	AddComplex64(key string, value complex64)
+	AddComplex128(key string, value complex128)
+	AddString(key, value string)
+	AddError(key string, value error)
+}

field/field.go

@@ -0,0 +1,333 @@
+package field
+
+import (
+	"fmt"
+	"time"
+)
+
+func Any(key string, value interface{}) Field {
+	return Key(key).Any(value)
+}
+
+func String(key, value string) Field {
+	return Key(key).String(value)
+}
+
+func Stringp(key string, value *string) Field {
+	return Key(key).Stringp(value)
+}
+
+func Strings(key string, value ...string) Field {
+	return Key(key).Strings(value...)
+}
+
+func Bool(key string, value bool) Field {
+	return Key(key).Bool(value)
+}
+
+func Bools(key string, value ...bool) Field {
+	return Key(key).Bools(value...)
+}
+
+func Boolp(key string, value *bool) Field {
+	return Key(key).Boolp(value)
+}
+
+func Uint(key string, value uint) Field {
+	return Key(key).Uint(value)
+}
+
+func Uints(key string, value ...uint) Field {
+	return Key(key).Uints(value...)
+}
+
+func Uintp(key string, value *uint) Field {
+	return Key(key).Uintp(value)
+}
+
+func Uint8(key string, value uint8) Field {
+	return Key(key).Uint8(value)
+}
+
+func Uint8s(key string, value ...uint8) Field {
+	return Key(key).Uint8s(value...)
+}
+
+func Uint8p(key string, value *uint8) Field {
+	return Key(key).Uint8p(value)
+}
+
+func Uint16(key string, value uint16) Field {
+	return Key(key).Uint16(value)
+}
+
+func Uint16s(key string, value ...uint16) Field {
+	return Key(key).Uint16s(value...)
+}
+
+func Uint16p(key string, value *uint16) Field {
+	return Key(key).Uint16p(value)
+}
+
+func Uint32(key string, value uint32) Field {
+	return Key(key).Uint32(value)
+}
+
+func Uint32s(key string, value ...uint32) Field {
+	return Key(key).Uint32s(value...)
+}
+
+func Uint32p(key string, value *uint32) Field {
+	return Key(key).Uint32p(value)
+}
+
+func Uint64(key string, value uint64) Field {
+	return Key(key).Uint64(value)
+}
+
+func Uint64s(key string, value ...uint64) Field {
+	return Key(key).Uint64s(value...)
+}
+
+func Uint64p(key string, value *uint64) Field {
+	return Key(key).Uint64p(value)
+}
+
+func Int(key string, value int) Field {
+	return Key(key).Int(value)
+}
+
+func Ints(key string, value ...int) Field {
+	return Key(key).Ints(value...)
+}
+
+func Intp(key string, value *int) Field {
+	return Key(key).Intp(value)
+}
+
+func Int8(key string, value int8) Field {
+	return Key(key).Int8(value)
+}
+
+func Int8s(key string, value ...int8) Field {
+	return Key(key).Int8s(value...)
+}
+
+func Int8p(key string, value *int8) Field {
+	return Key(key).Int8p(value)
+}
+
+func Int16(key string, value int16) Field {
+	return Key(key).Int16(value)
+}
+
+func Int16s(key string, value ...int16) Field {
+	return Key(key).Int16s(value...)
+}
+
+func Int16p(key string, value *int16) Field {
+	return Key(key).Int16p(value)
+}
+
+func Int32(key string, value int32) Field {
+	return Key(key).Int32(value)
+}
+
+func Int32s(key string, value ...int32) Field {
+	return Key(key).Int32s(value...)
+}
+
+func Int32p(key string, value *int32) Field {
+	return Key(key).Int32p(value)
+}
+
+func Int64(key string, value int64) Field {
+	return Key(key).Int64(value)
+}
+
+func Int64s(key string, value ...int64) Field {
+	return Key(key).Int64s(value...)
+}
+
+func Int64p(key string, value *int64) Field {
+	return Key(key).Int64p(value)
+}
+
+func Float32(key string, value float32) Field {
+	return Key(key).Float32(value)
+}
+
+func Float32s(key string, value ...float32) Field {
+	return Key(key).Float32s(value...)
+}
+
+func Float32p(key string, value *float32) Field {
+	return Key(key).Float32p(value)
+}
+
+func Float64(key string, value float64) Field {
+	return Key(key).Float64(value)
+}
+
+func Float64s(key string, value ...float64) Field {
+	return Key(key).Float64s(value...)
+}
+
+func Float64p(key string, value *float64) Field {
+	return Key(key).Float64p(value)
+}
+
+func Complex64(key string, value complex64) Field {
+	return Key(key).Complex64(value)
+}
+
+func Complex64s(key string, value ...complex64) Field {
+	return Key(key).Complex64s(value...)
+}
+
+func Complex64p(key string, value *complex64) Field {
+	return Key(key).Complex64p(value)
+}
+
+func Uintptr(key string, value uintptr) Field {
+	return Key(key).Uintptr(value)
+}
+
+func Uintptrs(key string, value ...uintptr) Field {
+	return Key(key).Uintptrs(value...)
+}
+
+func Uintptrp(key string, value *uintptr) Field {
+	return Key(key).Uintptrp(value)
+}
+
+func Bytes(key string, value []byte) Field {
+	return Key(key).Bytes(value)
+}
+
+func Duration(key string, value time.Duration) Field {
+	return Key(key).Dureation(value)
+}
+
+func Durations(key string, value ...time.Duration) Field {
+	return Key(key).Dureations(value)
+}
+
+func Durationp(key string, value *time.Duration) Field {
+	return Key(key).Dureationp(value)
+}
+
+func Time(key string, value time.Time) Field {
+	return Key(key).Time(value)
+}
+
+func Times(key string, value ...time.Time) Field {
+	return Key(key).Times(value...)
+}
+
+func Timep(key string, value *time.Time) Field {
+	return Key(key).Timep(value)
+}
+
+func FormatTime(key, format string, value time.Time) Field {
+	return Key(key).FormatTime(format, value)
+}
+
+func FormatTimes(key, foramt string, value ...time.Time) Field {
+	return Key(key).FormatTimes(foramt, value...)
+}
+
+func FormatTimep(key, foramt string, value *time.Time) Field {
+	return Key(key).FormatTimep(foramt, value)
+}
+
+func Error(key string, value error) Field {
+	return Key(key).Error(value)
+}
+
+func Errors(key string, value ...error) Field {
+	return Key(key).Errors(value...)
+}
+
+// Field struct.
+type Field struct {
+	key   Key
+	value Value
+}
+
+//nolint: gocyclo
+func (f Field) AddTo(enc Encoder) {
+	key := string(f.key)
+
+	switch {
+	case f.value.IsArray():
+		enc.AddAny(key, f.value)
+	case f.value.IsNil():
+		enc.AddNil(key)
+	case f.value.IsBool():
+		enc.AddBool(key, f.value.asBool())
+	case f.value.IsBinary():
+		enc.AddBinary(key, f.value.asBinary())
+	case f.value.IsInt():
+		enc.AddInt(key, f.value.asInt())
+	case f.value.IsInt8():
+		enc.AddInt8(key, f.value.asInt8())
+	case f.value.IsInt16():
+		enc.AddInt16(key, f.value.asInt16())
+	case f.value.IsInt32():
+		enc.AddInt32(key, f.value.asInt32())
+	case f.value.IsInt64():
+		enc.AddInt64(key, f.value.asInt64())
+	case f.value.IsUint():
+		enc.AddUint(key, f.value.asUint())
+	case f.value.IsUint8():
+		enc.AddUint8(key, f.value.asUint8())
+	case f.value.IsUint16():
+		enc.AddUint16(key, f.value.asUint16())
+	case f.value.IsUint32():
+		enc.AddUint32(key, f.value.asUint32())
+	case f.value.IsUint64():
+		enc.AddUint64(key, f.value.asUint64())
+	case f.value.IsUintptr():
+		enc.AddUintptr(key, f.value.asUintptr())
+	case f.value.IsTime():
+		enc.AddTime(key, f.value.asTime())
+	case f.value.IsDuration():
+		enc.AddDuration(key, f.value.asDuration())
+	case f.value.IsFloat32():
+		enc.AddFloat32(key, f.value.asFloat32())
+	case f.value.IsFloat64():
+		enc.AddFloat64(key, f.value.asFloat64())
+	case f.value.IsComplex64():
+		enc.AddComplex64(key, f.value.asComplex64())
+	case f.value.IsComplex128():
+		enc.AddComplex128(key, f.value.asComplex128())
+	case f.value.IsString():
+		enc.AddString(key, f.value.asString())
+	case f.value.IsError():
+		enc.AddError(key, f.value.asError())
+	default:
+		enc.AddAny(key, f.value)
+	}
+}
+
+func (f Field) Type() Type {
+	return f.value.vtype
+}
+
+func (f Field) Key() Key {
+	return f.key
+}
+
+func (f Field) Value() Value {
+	return f.value
+}
+
+func (f Field) AsInterface() interface{} {
+	return f.value.AsInterface()
+}
+
+// String implent stringer.
+func (f Field) String() string {
+	return fmt.Sprintf("%s=%+v", f.key, f.value.AsInterface())
+}

field/fields.go

@@ -0,0 +1,29 @@
+package field
+
+type Fields []Field
+
+type MapField map[Key]Value
+
+func (f Fields) Append(fields ...Field) Fields {
+	f = append(f, fields...)
+
+	return f
+}
+
+func (f Fields) Set(idx int, field Field) {
+	f[idx] = field
+}
+
+func (f Fields) Len() int {
+	return len(f)
+}
+
+func (f Fields) AsMap() MapField {
+	m := make(MapField, len(f))
+
+	for _, field := range f {
+		m[field.Key()] = field.Value()
+	}
+
+	return m
+}

field/key.go

@@ -0,0 +1,568 @@
+package field
+
+import (
+	"time"
+)
+
+type Key string
+
+//nolint: gocyclo, funlen
+func (k Key) Any(value interface{}) Field {
+	switch v := value.(type) {
+	case string:
+		return k.String(v)
+	case *string:
+		return k.Stringp(v)
+	case []string:
+		return k.Strings(v...)
+	case bool:
+		return k.Bool(v)
+	case *bool:
+		return k.Boolp(v)
+	case []bool:
+		return k.Bools(v...)
+	case int8:
+		return k.Int8(v)
+	case []int8:
+		return k.Int8s(v...)
+	case *int8:
+		return k.Int8p(v)
+	case int16:
+		return k.Int16(v)
+	case []int16:
+		return k.Int16s(v...)
+	case *int16:
+		return k.Int16p(v)
+	case int32:
+		return k.Int32(v)
+	case []int32:
+		return k.Int32s(v...)
+	case *int32:
+		return k.Int32p(v)
+	case int64:
+		return k.Int64(v)
+	case []int64:
+		return k.Int64s(v...)
+	case *int64:
+		return k.Int64p(v)
+	case uint:
+		return k.Uint(v)
+	case []uint:
+		return k.Uints(v...)
+	case *uint:
+		return k.Uintp(v)
+	case uint8:
+		return k.Uint8(v)
+	case *uint8:
+		return k.Uint8p(v)
+	case uint16:
+		return k.Uint16(v)
+	case []uint16:
+		return k.Uint16s(v...)
+	case *uint16:
+		return k.Uint16p(v)
+	case uint32:
+		return k.Uint32(v)
+	case []uint32:
+		return k.Uint32s(v...)
+	case *uint32:
+		return k.Uint32p(v)
+	case uint64:
+		return k.Uint64(v)
+	case []uint64:
+		return k.Uint64s(v...)
+	case *uint64:
+		return k.Uint64p(v)
+	case float32:
+		return k.Float32(v)
+	case []float32:
+		return k.Float32s(v...)
+	case *float32:
+		return k.Float32p(v)
+	case float64:
+		return k.Float64(v)
+	case []float64:
+		return k.Float64s(v...)
+	case *float64:
+		return k.Float64p(v)
+	case complex64:
+		return k.Complex64(v)
+	case []complex64:
+		return k.Complex64s(v...)
+	case *complex64:
+		return k.Complex64p(v)
+	case uintptr:
+		return k.Uintptr(v)
+	case []uintptr:
+		return k.Uintptrs(v...)
+	case *uintptr:
+		return k.Uintptrp(v)
+	case []byte:
+		return k.Bytes(v)
+	case time.Duration:
+		return k.Dureation(v)
+	case []time.Duration:
+		return k.Dureations(v)
+	case *time.Duration:
+		return k.Dureationp(v)
+	case time.Time:
+		return k.Time(v)
+	case []time.Time:
+		return k.Times(v...)
+	case *time.Time:
+		return k.Timep(v)
+	case error:
+		return k.Error(v)
+	case []error:
+		return k.Errors(v...)
+	}
+
+	return Field{
+		key: k,
+		value: Value{
+			value: value,
+			vtype: TypeAny,
+		},
+	}
+}
+
+func (k Key) String(value string) Field {
+	return Field{
+		key:   k,
+		value: stringValue(value),
+	}
+}
+
+func (k Key) Strings(value ...string) Field {
+	return Field{
+		key:   k,
+		value: stringsValue(value),
+	}
+}
+
+func (k Key) Stringp(value *string) Field {
+	return Field{
+		key:   k,
+		value: stringpValue(value),
+	}
+}
+
+func (k Key) Bool(value bool) Field {
+	return Field{
+		key:   k,
+		value: boolValue(value),
+	}
+}
+
+func (k Key) Bools(value ...bool) Field {
+	return Field{
+		key:   k,
+		value: boolsValue(value),
+	}
+}
+
+func (k Key) Boolp(value *bool) Field {
+	return Field{
+		key:   k,
+		value: boolpValue(value),
+	}
+}
+
+func (k Key) Int(value int) Field {
+	return Field{
+		key:   k,
+		value: intValue(value),
+	}
+}
+
+func (k Key) Ints(value ...int) Field {
+	return Field{
+		key:   k,
+		value: intsValue(value),
+	}
+}
+
+func (k Key) Intp(value *int) Field {
+	return Field{
+		key:   k,
+		value: intpValue(value),
+	}
+}
+
+func (k Key) Int8(value int8) Field {
+	return Field{
+		key:   k,
+		value: int8Value(value),
+	}
+}
+
+func (k Key) Int8s(value ...int8) Field {
+	return Field{
+		key:   k,
+		value: int8sValue(value),
+	}
+}
+
+func (k Key) Int8p(value *int8) Field {
+	return Field{
+		key:   k,
+		value: int8pValue(value),
+	}
+}
+
+func (k Key) Int16(value int16) Field {
+	return Field{
+		key:   k,
+		value: int16Value(value),
+	}
+}
+
+func (k Key) Int16s(value ...int16) Field {
+	return Field{
+		key:   k,
+		value: int16sValue(value),
+	}
+}
+
+func (k Key) Int16p(value *int16) Field {
+	return Field{
+		key:   k,
+		value: int16pValue(value),
+	}
+}
+
+func (k Key) Int32(value int32) Field {
+	return Field{
+		key:   k,
+		value: int32Value(value),
+	}
+}
+
+func (k Key) Int32s(value ...int32) Field {
+	return Field{
+		key:   k,
+		value: int32sValue(value),
+	}
+}
+
+func (k Key) Int32p(value *int32) Field {
+	return Field{
+		key:   k,
+		value: int32pValue(value),
+	}
+}
+
+func (k Key) Int64(value int64) Field {
+	return Field{
+		key:   k,
+		value: int64Value(value),
+	}
+}
+
+func (k Key) Int64s(value ...int64) Field {
+	return Field{
+		key:   k,
+		value: int64sValue(value),
+	}
+}
+
+func (k Key) Int64p(value *int64) Field {
+	return Field{
+		key:   k,
+		value: int64pValue(value),
+	}
+}
+
+func (k Key) Uint(value uint) Field {
+	return Field{
+		key:   k,
+		value: uintValue(value),
+	}
+}
+
+func (k Key) Uints(value ...uint) Field {
+	return Field{
+		key:   k,
+		value: uintsValue(value),
+	}
+}
+
+func (k Key) Uintp(value *uint) Field {
+	return Field{
+		key:   k,
+		value: uintpValue(value),
+	}
+}
+
+func (k Key) Uint8(value uint8) Field {
+	return Field{
+		key:   k,
+		value: uint8Value(value),
+	}
+}
+
+func (k Key) Uint8s(value ...uint8) Field {
+	return Field{
+		key:   k,
+		value: uint8sValue(value),
+	}
+}
+
+func (k Key) Uint8p(value *uint8) Field {
+	return Field{
+		key:   k,
+		value: uint8pValue(value),
+	}
+}
+
+func (k Key) Uint16(value uint16) Field {
+	return Field{
+		key:   k,
+		value: uint16Value(value),
+	}
+}
+
+func (k Key) Uint16s(value ...uint16) Field {
+	return Field{
+		key:   k,
+		value: uint16sValue(value),
+	}
+}
+
+func (k Key) Uint16p(value *uint16) Field {
+	return Field{
+		key:   k,
+		value: uint16pValue(value),
+	}
+}
+
+func (k Key) Uint32(value uint32) Field {
+	return Field{
+		key:   k,
+		value: uint32Value(value),
+	}
+}
+
+func (k Key) Uint32s(value ...uint32) Field {
+	return Field{
+		key:   k,
+		value: uint32sValue(value),
+	}
+}
+
+func (k Key) Uint32p(value *uint32) Field {
+	return Field{
+		key:   k,
+		value: uint32pValue(value),
+	}
+}
+
+func (k Key) Uint64(value uint64) Field {
+	return Field{
+		key:   k,
+		value: uint64Value(value),
+	}
+}
+
+func (k Key) Uint64s(value ...uint64) Field {
+	return Field{
+		key:   k,
+		value: uint64sValue(value),
+	}
+}
+
+func (k Key) Uint64p(value *uint64) Field {
+	return Field{
+		key:   k,
+		value: uint64pValue(value),
+	}
+}
+
+func (k Key) Float32(value float32) Field {
+	return Field{
+		key:   k,
+		value: float32Value(value),
+	}
+}
+
+func (k Key) Float32s(value ...float32) Field {
+	return Field{
+		key:   k,
+		value: float32sValue(value),
+	}
+}
+
+func (k Key) Float32p(value *float32) Field {
+	return Field{
+		key:   k,
+		value: float32pValue(value),
+	}
+}
+
+func (k Key) Float64(value float64) Field {
+	return Field{
+		key:   k,
+		value: float64Value(value),
+	}
+}
+
+func (k Key) Float64s(value ...float64) Field {
+	return Field{
+		key:   k,
+		value: float64sValue(value),
+	}
+}
+
+func (k Key) Float64p(value *float64) Field {
+	return Field{
+		key:   k,
+		value: float64pValue(value),
+	}
+}
+
+func (k Key) Complex64(value complex64) Field {
+	return Field{
+		key:   k,
+		value: complex64Value(value),
+	}
+}
+
+func (k Key) Complex64s(value ...complex64) Field {
+	return Field{
+		key:   k,
+		value: complex64sValue(value),
+	}
+}
+
+func (k Key) Complex64p(value *complex64) Field {
+	return Field{
+		key:   k,
+		value: complex64pValue(value),
+	}
+}
+
+func (k Key) Complex128(value complex128) Field {
+	return Field{
+		key:   k,
+		value: complex128Value(value),
+	}
+}
+
+func (k Key) Complex128s(value []complex128) Field {
+	return Field{
+		key:   k,
+		value: complex128sValue(value),
+	}
+}
+
+func (k Key) Complex128p(value *complex128) Field {
+	return Field{
+		key:   k,
+		value: complex128pValue(value),
+	}
+}
+
+func (k Key) Uintptr(value uintptr) Field {
+	return Field{
+		key:   k,
+		value: uintptrValue(value),
+	}
+}
+
+func (k Key) Uintptrs(value ...uintptr) Field {
+	return Field{
+		key:   k,
+		value: uintptrsValue(value),
+	}
+}
+
+func (k Key) Uintptrp(value *uintptr) Field {
+	return Field{
+		key:   k,
+		value: uintptrpValue(value),
+	}
+}
+
+func (k Key) Bytes(value []byte) Field {
+	return Field{
+		key:   k,
+		value: bytesValue(value),
+	}
+}
+
+func (k Key) Dureation(value time.Duration) Field {
+	return Field{
+		key:   k,
+		value: durationValue(value),
+	}
+}
+
+func (k Key) Dureations(value []time.Duration) Field {
+	return Field{
+		key:   k,
+		value: durationsValue(value),
+	}
+}
+
+func (k Key) Dureationp(value *time.Duration) Field {
+	return Field{
+		key:   k,
+		value: durationpValue(value),
+	}
+}
+
+func (k Key) Time(value time.Time) Field {
+	return Field{
+		key:   k,
+		value: timeValue(value),
+	}
+}
+
+func (k Key) Times(value ...time.Time) Field {
+	return Field{
+		key:   k,
+		value: timesValue(value),
+	}
+}
+
+func (k Key) Timep(value *time.Time) Field {
+	return Field{
+		key:   k,
+		value: timepValue(value),
+	}
+}
+
+func (k Key) FormatTime(format string, value time.Time) Field {
+	return Field{
+		key:   k,
+		value: formatTimeValue(format, value),
+	}
+}
+
+func (k Key) FormatTimes(format string, value ...time.Time) Field {
+	return Field{
+		key:   k,
+		value: formatTimesValue(format, value),
+	}
+}
+
+func (k Key) FormatTimep(format string, value *time.Time) Field {
+	return Field{
+		key:   k,
+		value: formatTimepValue(format, value),
+	}
+}
+
+func (k Key) Error(value error) Field {
+	return Field{
+		key:   k,
+		value: errorValue(value),
+	}
+}
+
+func (k Key) Errors(value ...error) Field {
+	return Field{
+		key:   k,
+		value: errorsValue(value),
+	}
+}

field/type.go

@@ -0,0 +1,126 @@
+package field
+
+type Type uint32
+
+const (
+	TypeAny        Type = 1 << iota // any
+	TypeArray                       // array
+	TypeNil                         // nil
+	TypeString                      // string
+	TypeBool                        // bool
+	TypeInt                         // int
+	TypeInt8                        // int8
+	TypeInt16                       // int16
+	TypeInt32                       // int32
+	TypeInt64                       // int64
+	TypeUint                        // uint
+	TypeUint8                       // uint8
+	TypeUint16                      // uint16
+	TypeUint32                      // uint32
+	TypeUint64                      // uint64
+	TypeFloat32                     // float32
+	TypeFloat64                     // float64
+	TypeComplex64                   // complex64
+	TypeComplex128                  // complex128
+	TypeUintptr                     // uintptr
+	TypeBinary                      // bytes
+	TypeDuration                    // duration
+	TypeTime                        // time
+	TypeError                       // error
+)
+
+func (t Type) IsAny() bool {
+	return t&TypeAny > 0
+}
+
+func (t Type) IsArray() bool {
+	return t&TypeArray > 0
+}
+
+func (t Type) IsNil() bool {
+	return t&TypeNil > 0
+}
+
+func (t Type) IsBool() bool {
+	return t&TypeBool > 0
+}
+
+func (t Type) IsString() bool {
+	return t&TypeString > 0
+}
+
+func (t Type) IsInt() bool {
+	return t&TypeInt > 0
+}
+
+func (t Type) IsInt8() bool {
+	return t&TypeInt8 > 0
+}
+
+func (t Type) IsInt16() bool {
+	return t&TypeInt16 > 0
+}
+
+func (t Type) IsInt32() bool {
+	return t&TypeInt32 > 0
+}
+
+func (t Type) IsInt64() bool {
+	return t&TypeInt64 > 0
+}
+
+func (t Type) IsUint() bool {
+	return t&TypeUint > 0
+}
+
+func (t Type) IsUint8() bool {
+	return t&TypeUint8 > 0
+}
+
+func (t Type) IsUint16() bool {
+	return t&TypeUint16 > 0
+}
+
+func (t Type) IsUint32() bool {
+	return t&TypeUint32 > 0
+}
+
+func (t Type) IsUint64() bool {
+	return t&TypeUint64 > 0
+}
+
+func (t Type) IsFloat32() bool {
+	return t&TypeFloat32 > 0
+}
+
+func (t Type) IsFloat64() bool {
+	return t&TypeFloat64 > 0
+}
+
+func (t Type) IsComplex64() bool {
+	return t&TypeComplex64 > 0
+}
+
+func (t Type) IsComplex128() bool {
+	return t&TypeComplex128 > 0
+}
+
+func (t Type) IsUintptr() bool {
+	return t&TypeUintptr > 0
+}
+
+func (t Type) IsBinary() bool {
+	return t&TypeBinary > 0
+}
+
+func (t Type) IsDuration() bool {
+	return t&TypeDuration > 0
+}
+
+func (t Type) IsTime() bool {
+	return t&TypeTime > 0
+}
+
+func (t Type) IsError() bool {
+	return t&TypeError > 0
+}

field/value.go

@@ -0,0 +1,755 @@
+package field
+
+import (
+	"encoding/json"
+	"fmt"
+	"math"
+	"strconv"
+	"time"
+)
+
+type Value struct {
+	vtype    Type
+	numeric  uint64
+	stringly string
+	value    interface{}
+}
+
+func (v Value) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.AsInterface())
+}
+
+//nolint: gocyclo
+func (v Value) String() string {
+	switch {
+	case v.vtype.IsArray(), v.vtype.IsAny():
+		return fmt.Sprintf("%+v", v.AsInterface())
+	case v.vtype.IsNil():
+		return "<nil>"
+	case v.vtype.IsString():
+		return v.asString()
+	case v.vtype.IsBool():
+		return strconv.FormatBool(v.asBool())
+	case v.vtype.IsInt(), v.vtype.IsInt8(), v.vtype.IsInt16(), v.vtype.IsInt32():
+		return strconv.Itoa(v.asInt())
+	case v.vtype.IsInt64():
+		return strconv.FormatInt(v.asInt64(), 10)
+	case v.vtype.IsUint(), v.vtype.IsUint8(), v.vtype.IsUint16(), v.vtype.IsUint32(), v.vtype.IsUint64():
+		return strconv.FormatUint(v.asUint64(), 10)
+	case v.vtype.IsFloat64():
+		return strconv.FormatFloat(v.asFloat64(), 'g', -1, 64)
+	case v.vtype.IsFloat32():
+		return strconv.FormatFloat(float64(v.asFloat32()), 'g', -1, 32)
+	case v.vtype.IsComplex128():
+		return strconv.FormatComplex(v.asComplex128(), 'g', -1, 128)
+	case v.vtype.IsComplex64():
+		return strconv.FormatComplex(complex128(v.asComplex64()), 'g', -1, 64)
+	case v.vtype.IsBinary():
+		return string(v.asBinary())
+	case v.vtype.IsDuration():
+		return v.asDuration().String()
+	case v.vtype.IsTime():
+		return v.asTime().Format(v.asString())
+	case v.vtype.IsError():
+		return v.asError().Error()
+	}
+
+	return fmt.Sprintf("%+v", v.AsInterface())
+}
+
+//nolint: gocyclo
+func (v Value) AsInterface() interface{} {
+	switch {
+	case v.vtype.IsArray():
+		return v.value
+	case v.vtype.IsNil():
+		return nil
+	case v.vtype.IsString():
+		return v.asString()
+	case v.vtype.IsBool():
+		return v.asBool()
+	case v.vtype.IsInt():
+		return v.asInt()
+	case v.vtype.IsInt8():
+		return v.asInt8()
+	case v.vtype.IsInt16():
+		return v.asInt16()
+	case v.vtype.IsInt32():
+		return v.asInt32()
+	case v.vtype.IsInt64():
+		return v.asInt64()
+	case v.vtype.IsUint():
+		return v.asUint()
+	case v.vtype.IsUint8():
+		return v.asUint8()
+	case v.vtype.IsUint16():
+		return v.asUint16()
+	case v.vtype.IsUint32():
+		return v.asUint32()
+	case v.vtype.IsUint64():
+		return v.asUint64()
+	case v.vtype.IsFloat32():
+		return v.asFloat32()
+	case v.vtype.IsFloat64():
+		return v.asFloat64()
+	case v.vtype.IsComplex64():
+		return v.asComplex64()
+	case v.vtype.IsComplex128():
+		return v.asComplex128()
+	case v.vtype.IsUintptr():
+		return v.asUintptr()
+	case v.vtype.IsBinary():
+		return v.asBinary()
+	case v.vtype.IsDuration():
+		return v.asDuration()
+	case v.vtype.IsTime():
+		return v.asTime()
+	case v.vtype.IsError():
+		return v.asError()
+	}
+
+	return v.value
+}
+
+func (v Value) IsArray() bool {
+	return v.vtype.IsArray()
+}
+
+func (v Value) IsNil() bool {
+	return v.vtype.IsNil()
+}
+
+func (v Value) IsString() bool {
+	return v.vtype.IsString()
+}
+
+func (v Value) IsBool() bool {
+	return v.vtype.IsBool()
+}
+
+func (v Value) IsInt() bool {
+	return v.vtype.IsInt()
+}
+
+func (v Value) IsInt8() bool {
+	return v.vtype.IsInt8()
+}
+
+func (v Value) IsInt16() bool {
+	return v.vtype.IsInt16()
+}
+
+func (v Value) IsInt32() bool {
+	return v.vtype.IsInt32()
+}
+
+func (v Value) IsInt64() bool {
+	return v.vtype.IsInt64()
+}
+
+func (v Value) IsUint() bool {
+	return v.vtype.IsUint()
+}
+
+func (v Value) IsUint8() bool {
+	return v.vtype.IsUint8()
+}
+
+func (v Value) IsUint16() bool {
+	return v.vtype.IsUint16()
+}
+
+func (v Value) IsUint32() bool {
+	return v.vtype.IsUint32()
+}
+
+func (v Value) IsUint64() bool {
+	return v.vtype.IsUint64()
+}
+
+func (v Value) IsFloat32() bool {
+	return v.vtype.IsFloat32()
+}
+
+func (v Value) IsFloat64() bool {
+	return v.vtype.IsFloat64()
+}
+
+func (v Value) IsComplex64() bool {
+	return v.vtype.IsComplex64()
+}
+
+func (v Value) IsComplex128() bool {
+	return v.vtype.IsComplex128()
+}
+
+func (v Value) IsUintptr() bool {
+	return v.vtype.IsUintptr()
+}
+
+func (v Value) IsBinary() bool {
+	return v.vtype.IsBinary()
+}
+
+func (v Value) IsDuration() bool {
+	return v.vtype.IsDuration()
+}
+
+func (v Value) IsTime() bool {
+	return v.vtype.IsTime()
+}
+
+func (v Value) IsError() bool {
+	return v.vtype.IsError()
+}
+
+func (v Value) asString() string {
+	return v.stringly
+}
+
+func (v Value) asBool() bool {
+	return v.numeric == 1
+}
+
+func (v Value) asInt() int {
+	return int(v.numeric)
+}
+
+func (v Value) asInt8() int8 {
+	return int8(v.numeric)
+}
+
+func (v Value) asInt16() int16 {
+	return int16(v.numeric)
+}
+
+func (v Value) asInt32() int32 {
+	return int32(v.numeric)
+}
+
+func (v Value) asInt64() int64 {
+	return int64(v.numeric)
+}
+
+func (v Value) asUint() uint {
+	return uint(v.numeric)
+}
+
+func (v Value) asUint8() uint8 {
+	return uint8(v.numeric)
+}
+
+func (v Value) asUint16() uint16 {
+	return uint16(v.numeric)
+}
+
+func (v Value) asUint32() uint32 {
+	return uint32(v.numeric)
+}
+
+func (v Value) asUint64() uint64 {
+	return v.numeric
+}
+
+func (v Value) asFloat32() float32 {
+	return math.Float32frombits(uint32(v.numeric))
+}
+
+func (v Value) asFloat64() float64 {
+	return math.Float64frombits(v.numeric)
+}
+
+func (v Value) asComplex64() complex64 {
+	return v.value.(complex64)
+}
+
+func (v Value) asComplex128() complex128 {
+	return v.value.(complex128)
+}
+
+func (v Value) asUintptr() uintptr {
+	return v.value.(uintptr)
+}
+
+func (v Value) asBinary() []byte {
+	return v.value.([]byte)
+}
+
+func (v Value) asDuration() time.Duration {
+	return v.value.(time.Duration)
+}
+
+func (v Value) asTime() time.Time {
+	return v.value.(time.Time)
+}
+
+func (v Value) asError() error {
+	return v.value.(error)
+}
+
+func nilValue(t Type) Value {
+	return Value{vtype: t | TypeNil}
+}
+
+func stringValue(v string) Value {
+	return Value{
+		stringly: v,
+		vtype:    TypeString,
+	}
+}
+
+func stringsValue(v []string) Value {
+	return Value{
+		value: v,
+		vtype: TypeString | TypeArray,
+	}
+}
+
+func stringpValue(v *string) Value {
+	if v != nil {
+		return stringValue(*v)
+	}
+
+	return nilValue(TypeString)
+}
+
+func boolValue(b bool) Value {
+	if b {
+		return Value{
+			numeric: 1,
+			vtype:   TypeBool,
+		}
+	}
+
+	return Value{
+		vtype: TypeBool,
+	}
+}
+
+func boolsValue(b []bool) Value {
+	return Value{
+		value: b,
+		vtype: TypeBool | TypeArray,
+	}
+}
+
+func boolpValue(b *bool) Value {
+	if b != nil {
+		return boolValue(*b)
+	}
+
+	return nilValue(TypeBool)
+}
+
+func intValue(i int) Value {
+	return Value{
+		vtype:   TypeInt,
+		numeric: uint64(i),
+	}
+}
+
+func intsValue(i []int) Value {
+	return Value{
+		value: i,
+		vtype: TypeInt | TypeArray,
+	}
+}
+
+func intpValue(in *int) Value {
+	if in != nil {
+		return intValue(*in)
+	}
+
+	return nilValue(TypeInt)
+}
+
+func int8Value(i int8) Value {
+	return Value{
+		vtype:   TypeInt8,
+		numeric: uint64(i),
+	}
+}
+
+func int8sValue(i []int8) Value {
+	return Value{
+		value: i,
+		vtype: TypeInt8 | TypeArray,
+	}
+}
+
+func int8pValue(in *int8) Value {
+	if in != nil {
+		return int8Value(*in)
+	}
+
+	return nilValue(TypeInt8)
+}
+
+func int16Value(i int16) Value {
+	return Value{
+		vtype:   TypeInt16,
+		numeric: uint64(i),
+	}
+}
+
+func int16sValue(i []int16) Value {
+	return Value{
+		value: i,
+		vtype: TypeInt16 | TypeArray,
+	}
+}
+
+func int16pValue(in *int16) Value {
+	if in != nil {
+		return int16Value(*in)
+	}
+
+	return nilValue(TypeInt16)
+}
+
+func int32Value(i int32) Value {
+	return Value{
+		vtype:   TypeInt32,
+		numeric: uint64(i),
+	}
+}
+
+func int32sValue(i []int32) Value {
+	return Value{
+		value: i,
+		vtype: TypeInt32 | TypeArray,
+	}
+}
+
+func int32pValue(in *int32) Value {
+	if in != nil {
+		return int32Value(*in)
+	}
+
+	return nilValue(TypeInt32)
+}
+
+func int64Value(i int64) Value {
+	return Value{
+		vtype:   TypeInt64,
+		numeric: uint64(i),
+	}
+}
+
+func int64sValue(i []int64) Value {
+	return Value{
+		value: i,
+		vtype: TypeInt64 | TypeArray,
+	}
+}
+
+func int64pValue(in *int64) Value {
+	if in != nil {
+		return int64Value(*in)
+	}
+
+	return nilValue(TypeInt64)
+}
+
+func uintValue(i uint) Value {
+	return Value{
+		vtype:   TypeUint,
+		numeric: uint64(i),
+	}
+}
+
+func uintsValue(i []uint) Value {
+	return Value{
+		value: i,
+		vtype: TypeUint | TypeArray,
+	}
+}
+
+func uintpValue(in *uint) Value {
+	if in != nil {
+		return uintValue(*in)
+	}
+
+	return nilValue(TypeUint)
+}
+
+func uint8Value(i uint8) Value {
+	return Value{
+		vtype:   TypeUint8,
+		numeric: uint64(i),
+	}
+}
+
+func uint8sValue(i []uint8) Value {
+	return Value{
+		value: i,
+		vtype: TypeUint8 | TypeArray,
+	}
+}
+
+func uint8pValue(in *uint8) Value {
+	if in != nil {
+		return uint8Value(*in)
+	}
+
+	return nilValue(TypeUint8)
+}
+
+func uint16Value(i uint16) Value {
+	return Value{
+		vtype:   TypeUint16,
+		numeric: uint64(i),
+	}
+}
+
+func uint16sValue(i []uint16) Value {
+	return Value{
+		value: i,
+		vtype: TypeUint16 | TypeArray,
+	}
+}
+
+func uint16pValue(in *uint16) Value {
+	if in != nil {
+		return uint16Value(*in)
+	}
+
+	return nilValue(TypeUint16)
+}
+
+func uint32Value(i uint32) Value {
+	return Value{
+		vtype:   TypeUint32,
+		numeric: uint64(i),
+	}
+}
+
+func uint32sValue(i []uint32) Value {
+	return Value{
+		value: i,
+		vtype: TypeUint32 | TypeArray,
+	}
+}
+
+func uint32pValue(in *uint32) Value {
+	if in != nil {
+		return uint32Value(*in)
+	}
+
+	return nilValue(TypeUint32)
+}
+
+func uint64Value(i uint64) Value {
+	return Value{
+		vtype:   TypeUint64,
+		numeric: i,
+	}
+}
+
+func uint64sValue(i []uint64) Value {
+	return Value{
+		value: i,
+		vtype: TypeUint64 | TypeArray,
+	}
+}
+
+func uint64pValue(in *uint64) Value {
+	if in != nil {
+		return uint64Value(*in)
+	}
+
+	return nilValue(TypeUint64)
+}
+
+func float32Value(i float32) Value {
+	return Value{
+		vtype:   TypeFloat32,
+		numeric: uint64(math.Float32bits(i)),
+	}
+}
+
+func float32sValue(i []float32) Value {
+	return Value{
+		value: i,
+		vtype: TypeFloat32 | TypeArray,
+	}
+}
+
+func float32pValue(in *float32) Value {
+	if in != nil {
+		return float32Value(*in)
+	}
+
+	return nilValue(TypeFloat32)
+}
+
+func float64Value(i float64) Value {
+	return Value{
+		vtype:   TypeFloat64,
+		numeric: math.Float64bits(i),
+	}
+}
+
+func float64sValue(i []float64) Value {
+	return Value{
+		value: i,
+		vtype: TypeFloat64 | TypeArray,
+	}
+}
+
+func float64pValue(in *float64) Value {
+	if in != nil {
+		return float64Value(*in)
+	}
+
+	return nilValue(TypeFloat64)
+}
+
+func complex64Value(in complex64) Value {
+	return Value{
+		vtype: TypeComplex64,
+		value: in,
+	}
+}
+
+func complex64sValue(in []complex64) Value {
+	return Value{
+		vtype: TypeComplex64 | TypeArray,
+		value: in,
+	}
+}
+
+func complex64pValue(in *complex64) Value {
+	if in != nil {
+		return complex64Value(*in)
+	}
+
+	return nilValue(TypeComplex64)
+}
+
+func complex128Value(in complex128) Value {
+	return Value{
+		vtype: TypeComplex64,
+		value: in,
+	}
+}
+
+func complex128sValue(in []complex128) Value {
+	return Value{
+		vtype: TypeComplex128 | TypeArray,
+		value: in,
+	}
+}
+
+func complex128pValue(in *complex128) Value {
+	if in != nil {
+		return complex128Value(*in)
+	}
+
+	return nilValue(TypeComplex128)
+}
+
+func uintptrValue(in uintptr) Value {
+	return Value{
+		vtype: TypeUintptr,
+		value: in,
+	}
+}
+
+func uintptrsValue(in []uintptr) Value {
+	return Value{
+		vtype: TypeUintptr | TypeArray,
+		value: in,
+	}
+}
+
+func uintptrpValue(in *uintptr) Value {
+	if in != nil {
+		return uintptrValue(*in)
+	}
+
+	return nilValue(TypeUintptr)
+}
+
+func bytesValue(in []byte) Value {
+	return Value{
+		vtype: TypeBinary,
+		value: in,
+	}
+}
+
+func durationValue(in time.Duration) Value {
+	return Value{
+		vtype: TypeDuration,
+		value: in,
+	}
+}
+
+func durationsValue(in []time.Duration) Value {
+	return Value{
+		vtype: TypeDuration | TypeArray,
+		value: in,
+	}
+}
+
+func durationpValue(in *time.Duration) Value {
+	if in != nil {
+		return durationValue(*in)
+	}
+
+	return nilValue(TypeDuration)
+}
+
+func timeValue(in time.Time) Value {
+	return formatTimeValue(time.RFC3339, in)
+}
+
+func timesValue(in []time.Time) Value {
+	return formatTimesValue(time.RFC3339, in)
+}
+
+func timepValue(in *time.Time) Value {
+	return formatTimepValue(time.RFC3339, in)
+}
+
+func formatTimeValue(format string, in time.Time) Value {
+	return Value{
+		vtype:    TypeTime,
+		value:    in,
+		stringly: format,
+	}
+}
+
+func formatTimesValue(format string, in []time.Time) Value {
+	return Value{
+		vtype:    TypeTime | TypeArray,
+		value:    in,
+		stringly: format,
+	}
+}
+
+func formatTimepValue(format string, in *time.Time) Value {
+	if in != nil {
+		return formatTimeValue(format, *in)
+	}
+
+	return nilValue(TypeTime)
+}
+
+func errorValue(in error) Value {
+	if in != nil {
+		return Value{
+			vtype: TypeError,
+			value: in,
+		}
+	}
+
+	return nilValue(TypeError)
+}
+
+func errorsValue(in []error) Value {
+	return Value{
+		vtype: TypeError | TypeArray,
+		value: in,
+	}
+}

global.go

@@ -2,18 +2,27 @@ package log
 
 import (
 	"context"
+	"io"
+
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
 )
 
 //nolint:gochecknoglobals
-var global = With(New(), WithLevel(LevelDebug))
+var global = With(New(),
+	WithCaller("caller", 1, false),
+	WithLevel("level", level.Debug),
+	WithExit(level.Alert),
+	WithPanic(level.Emergency),
+)
 
 // SetLogger sets global used logger. This function is not thread-safe.
 func SetLogger(l Logger) {
 	global = l
 }
 
-// GetLogger return global logger.
-func GetLogger() Logger {
+// Log return global logger.
+func Log() Logger {
 	return global
 }
 
@@ -87,43 +96,83 @@ func Panicln(args ...interface{}) {
 	global.Panicln(args...)
 }
 
-// EmergKV log by emergency level and key-values.
-func EmergKV(ctx context.Context, msg string, args ...interface{}) {
+// EmergKVs sugared log by emergency level and key-values.
+func EmergKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.EmergKVs(ctx, msg, args...)
+}
+
+// AlertKVs sugared log by alert level and key-values.
+func AlertKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.AlertKVs(ctx, msg, args...)
+}
+
+// CritKVs sugared log by critcal level and key-values.
+func CritKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.CritKVs(ctx, msg, args...)
+}
+
+// ErrKVs sugared log by error level and key-values.
+func ErrKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.ErrKVs(ctx, msg, args...)
+}
+
+// WarnKVs sugared log by warning level and key-values.
+func WarnKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.WarnKVs(ctx, msg, args...)
+}
+
+// NoticeKVs sugared log by notice level and key-values.
+func NoticeKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.NoticeKVs(ctx, msg, args...)
+}
+
+// InfoKVs sugared log by info level and key-values.
+func InfoKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.InfoKVs(ctx, msg, args...)
+}
+
+// DebugKVs sugared log by debug level and key-values.
+func DebugKVs(ctx context.Context, msg string, args ...interface{}) {
+	global.DebugKVs(ctx, msg, args...)
+}
+
+// EmergKV  log by emergency level and key-values.
+func EmergKV(ctx context.Context, msg string, args ...field.Field) {
 	global.EmergKV(ctx, msg, args...)
 }
 
 // AlertKV log by alert level and key-values.
-func AlertKV(ctx context.Context, msg string, args ...interface{}) {
+func AlertKV(ctx context.Context, msg string, args ...field.Field) {
 	global.AlertKV(ctx, msg, args...)
 }
 
 // CritKV log by critcal level and key-values.
-func CritKV(ctx context.Context, msg string, args ...interface{}) {
+func CritKV(ctx context.Context, msg string, args ...field.Field) {
 	global.CritKV(ctx, msg, args...)
 }
 
 // ErrKV log by error level and key-values.
-func ErrKV(ctx context.Context, msg string, args ...interface{}) {
+func ErrKV(ctx context.Context, msg string, args ...field.Field) {
 	global.ErrKV(ctx, msg, args...)
 }
 
 // WarnKV log by warning level and key-values.
-func WarnKV(ctx context.Context, msg string, args ...interface{}) {
+func WarnKV(ctx context.Context, msg string, args ...field.Field) {
 	global.WarnKV(ctx, msg, args...)
 }
 
 // NoticeKV log by notice level and key-values.
-func NoticeKV(ctx context.Context, msg string, args ...interface{}) {
+func NoticeKV(ctx context.Context, msg string, args ...field.Field) {
 	global.NoticeKV(ctx, msg, args...)
 }
 
 // InfoKV log by info level and key-values.
-func InfoKV(ctx context.Context, msg string, args ...interface{}) {
+func InfoKV(ctx context.Context, msg string, args ...field.Field) {
 	global.InfoKV(ctx, msg, args...)
 }
 
 // DebugKV log by debug level and key-values.
-func DebugKV(ctx context.Context, msg string, args ...interface{}) {
+func DebugKV(ctx context.Context, msg string, args ...field.Field) {
 	global.DebugKV(ctx, msg, args...)
 }
 
@@ -181,3 +230,7 @@ func Fatalf(format string, args ...interface{}) {
 func Panicf(format string, args ...interface{}) {
 	global.Panicf(format, args...)
 }
+
+func Writer(ctx context.Context, level level.Level) io.Writer {
+	return global.Writer(ctx, level)
+}

go.mod

@@ -1,3 +1,10 @@
 module gitoa.ru/go-4devs/log
 
-go 1.14
+go 1.15
+
+require (
+	github.com/sirupsen/logrus v1.7.0
+	go.opentelemetry.io/otel v0.13.0
+	go.opentelemetry.io/otel/sdk v0.13.0
+	go.uber.org/zap v1.16.0
+)

go.sum

@@ -0,0 +1,76 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DataDog/sketches-go v0.0.1/go.mod h1:Q5DbzQ+3AkgGwymQO7aZFNP7ns2lZKGtvRBzRXfdi60=
+github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
+github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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+github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/sirupsen/logrus v1.7.0 h1:ShrD1U9pZB12TX0cVy0DtePoCH97K8EtX+mg7ZARUtM=
+github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+go.opentelemetry.io/otel v0.13.0 h1:2isEnyzjjJZq6r2EKMsFj4TxiQiexsM04AVhwbR/oBA=
+go.opentelemetry.io/otel v0.13.0/go.mod h1:dlSNewoRYikTkotEnxdmuBHgzT+k/idJSfDv/FxEnOY=
+go.opentelemetry.io/otel/sdk v0.13.0 h1:4VCfpKamZ8GtnepXxMRurSpHpMKkcxhtO33z1S4rGDQ=
+go.opentelemetry.io/otel/sdk v0.13.0/go.mod h1:dKvLH8Uu8LcEPlSAUsfW7kMGaJBhk/1NYvpPZ6wIMbU=
+go.uber.org/atomic v1.6.0 h1:Ezj3JGmsOnG1MoRWQkPBsKLe9DwWD9QeXzTRzzldNVk=
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+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=

handler/logrus/logger.go

@@ -0,0 +1,90 @@
+package logrus
+
+import (
+	"context"
+
+	"github.com/sirupsen/logrus"
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/level"
+)
+
+// Option configure logger.
+type Option func(*logger)
+
+// WithLevel sets callback level to log level.
+func WithLevel(level level.Level, c func(*logrus.Entry, string)) Option {
+	return func(l *logger) {
+		l.levels[level] = c
+	}
+}
+
+// WithLogrus sets logrus logger.
+func WithLogrus(logrus *logrus.Logger) Option {
+	return func(l *logger) {
+		l.logrus = logrus
+	}
+}
+
+// New create new logrus handler.
+func New(opts ...Option) log.Logger {
+	log := logger{
+		logrus: logrus.StandardLogger(),
+		levels: map[level.Level]func(*logrus.Entry, string){
+			level.Emergency: panicLog,
+			level.Alert:     fatalLog,
+			level.Critical:  errorLog,
+			level.Error:     errorLog,
+			level.Warning:   warnLog,
+			level.Notice:    infoLog,
+			level.Info:      infoLog,
+			level.Debug:     debugLog,
+		},
+	}
+
+	for _, o := range opts {
+		o(&log)
+	}
+
+	return log.log
+}
+
+type logger struct {
+	levels map[level.Level]func(l *logrus.Entry, msg string)
+	logrus *logrus.Logger
+}
+
+func (l *logger) log(ctx context.Context, e *entry.Entry) (int, error) {
+	lrgFields := make(logrus.Fields, e.Fields().Len())
+	for _, field := range e.Fields() {
+		lrgFields[string(field.Key())] = field.AsInterface()
+	}
+
+	l.levels[e.Level()](l.logrus.WithFields(lrgFields), e.Message())
+
+	return 0, nil
+}
+
+func panicLog(e *logrus.Entry, msg string) {
+	e.Panic(msg)
+}
+
+func fatalLog(e *logrus.Entry, msg string) {
+	e.Fatal(msg)
+}
+
+func errorLog(e *logrus.Entry, msg string) {
+	e.Error(msg)
+}
+
+func warnLog(e *logrus.Entry, msg string) {
+	e.Warn(msg)
+}
+
+func infoLog(e *logrus.Entry, msg string) {
+	e.Info(msg)
+}
+
+func debugLog(e *logrus.Entry, msg string) {
+	e.Debug(msg)
+}

handler/logrus/logger_test.go

@@ -0,0 +1,36 @@
+package logrus_test
+
+import (
+	"bytes"
+	"context"
+	"strings"
+	"testing"
+
+	lgr "github.com/sirupsen/logrus"
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/handler/logrus"
+	"gitoa.ru/go-4devs/log/level"
+)
+
+func TestNew(t *testing.T) {
+	ctx := context.Background()
+	buf := &bytes.Buffer{}
+
+	lgrus := lgr.New()
+	lgrus.SetLevel(lgr.DebugLevel)
+	lgrus.SetOutput(buf)
+	lgrus.SetFormatter(&lgr.TextFormatter{
+		DisableTimestamp: true,
+	})
+
+	handler := logrus.New(logrus.WithLogrus(lgrus))
+	expect := "level=info msg=\"handle logrus message\"\n"
+
+	if _, err := handler(ctx, entry.New(entry.WithLevel(level.Info), entry.WithMessage("handle logrus message"))); err != nil {
+		t.Error(err)
+	}
+
+	if !strings.HasSuffix(buf.String(), expect) {
+		t.Errorf("invalid suffix\n got: %s\nexpect:%s\n", buf.String(), expect)
+	}
+}

handler/otel/helpers.go

@@ -0,0 +1,56 @@
+package otel
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/level"
+	"go.opentelemetry.io/otel/api/trace"
+	"go.opentelemetry.io/otel/label"
+)
+
+const (
+	fieldSeverityNumber = "SeverityNumber"
+	fieldSeverityText   = "SeverityText"
+	levelFields         = 2
+)
+
+func levels(lvl level.Level) Level {
+	switch lvl {
+	case level.Emergency:
+		return levelError3
+	case level.Alert:
+		return levelFatal
+	case level.Critical:
+		return levelError2
+	case level.Error:
+		return levelError
+	case level.Warning:
+		return levelWarn
+	case level.Notice:
+		return levelInfo2
+	case level.Info:
+		return levelInfo
+	case level.Debug:
+		return levelDebug
+	}
+
+	return 0
+}
+
+func addEvent(ctx context.Context, e *entry.Entry) {
+	span := trace.SpanFromContext(ctx)
+	attrs := make([]label.KeyValue, 0, e.Fields().Len()+levelFields)
+
+	lvl := levels(e.Level())
+	attrs = append(attrs,
+		label.String(fieldSeverityText, lvl.String()),
+		label.Int(fieldSeverityNumber, int(lvl)),
+	)
+
+	for _, field := range e.Fields() {
+		attrs = append(attrs, label.String(string(field.Key()), field.Value().String()))
+	}
+
+	span.AddEvent(ctx, e.Message(), attrs...)
+}

handler/otel/level.go

@@ -0,0 +1,16 @@
+package otel
+
+//go:generate stringer -type=Level -linecomment -output=level_string.go
+
+type Level int
+
+const (
+	levelDebug  Level = 5  // DEBUG
+	levelInfo   Level = 9  // INFO
+	levelInfo2  Level = 10 // INFO2
+	levelWarn   Level = 13 // WARN
+	levelError  Level = 17 // ERROR
+	levelError2 Level = 18 // ERROR2
+	levelError3 Level = 19 // ERROR3
+	levelFatal  Level = 21 // FATAL
+)

handler/otel/level_string.go

@@ -0,0 +1,51 @@
+// Code generated by "stringer -type=Level -linecomment -output=level_string.go"; DO NOT EDIT.
+
+package otel
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[levelDebug-5]
+	_ = x[levelInfo-9]
+	_ = x[levelInfo2-10]
+	_ = x[levelWarn-13]
+	_ = x[levelError-17]
+	_ = x[levelError2-18]
+	_ = x[levelError3-19]
+	_ = x[levelFatal-21]
+}
+
+const (
+	_Level_name_0 = "DEBUG"
+	_Level_name_1 = "INFOINFO2"
+	_Level_name_2 = "WARN"
+	_Level_name_3 = "ERRORERROR2ERROR3"
+	_Level_name_4 = "FATAL"
+)
+
+var (
+	_Level_index_1 = [...]uint8{0, 4, 9}
+	_Level_index_3 = [...]uint8{0, 5, 11, 17}
+)
+
+func (i Level) String() string {
+	switch {
+	case i == 5:
+		return _Level_name_0
+	case 9 <= i && i <= 10:
+		i -= 9
+		return _Level_name_1[_Level_index_1[i]:_Level_index_1[i+1]]
+	case i == 13:
+		return _Level_name_2
+	case 17 <= i && i <= 19:
+		i -= 17
+		return _Level_name_3[_Level_index_3[i]:_Level_index_3[i+1]]
+	case i == 21:
+		return _Level_name_4
+	default:
+		return "Level(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+}

handler/otel/logger.go

@@ -0,0 +1,16 @@
+package otel
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+)
+
+func New() log.Logger {
+	return func(ctx context.Context, e *entry.Entry) (int, error) {
+		addEvent(ctx, e)
+
+		return 0, nil
+	}
+}

handler/otel/middleware.go

@@ -0,0 +1,16 @@
+package otel
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+)
+
+func Middleware() log.Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler log.Logger) (int, error) {
+		addEvent(ctx, e)
+
+		return handler(ctx, e)
+	}
+}

handler/zap/logger.go

@@ -0,0 +1,95 @@
+package zap
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/level"
+	"go.uber.org/zap"
+)
+
+// Option configure logger.
+type Option func(*logger)
+
+// WithLevel sets level logged message.
+func WithLevel(level level.Level, f func(z *zap.Logger, msg string, fields ...zap.Field)) Option {
+	return func(l *logger) {
+		l.levels[level] = f
+	}
+}
+
+// WithZap sets zap logger.
+func WithZap(z *zap.Logger) Option {
+	return func(l *logger) {
+		l.zap = z
+	}
+}
+
+// New create handler by zap logger.
+func New(opts ...Option) log.Logger {
+	z, err := zap.NewDevelopment()
+	if err != nil {
+		panic(err)
+	}
+
+	log := logger{
+		zap: z,
+		levels: map[level.Level]func(z *zap.Logger, msg string, fields ...zap.Field){
+			level.Emergency: fatalLog,
+			level.Alert:     panicLog,
+			level.Critical:  errorLog,
+			level.Error:     errorLog,
+			level.Warning:   warnLog,
+			level.Notice:    infoLog,
+			level.Info:      infoLog,
+			level.Debug:     debugLog,
+		},
+	}
+
+	for _, opt := range opts {
+		opt(&log)
+	}
+
+	return log.log
+}
+
+type logger struct {
+	zap    *zap.Logger
+	levels map[level.Level]func(z *zap.Logger, msg string, fields ...zap.Field)
+}
+
+func (l *logger) log(ctx context.Context, e *entry.Entry) (int, error) {
+	zf := make([]zap.Field, e.Fields().Len())
+	for i, field := range e.Fields() {
+		zf[i] = zap.Any(string(field.Key()), field.AsInterface())
+	}
+
+	l.levels[e.Level()](l.zap, e.Message(), zf...)
+
+	return 0, nil
+}
+
+func panicLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Panic(msg, fields...)
+}
+
+func fatalLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Fatal(msg, fields...)
+}
+
+func errorLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Error(msg, fields...)
+}
+
+func warnLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Warn(msg, fields...)
+}
+
+func infoLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Info(msg, fields...)
+}
+
+func debugLog(z *zap.Logger, msg string, fields ...zap.Field) {
+	z.Debug(msg, fields...)
+}

handler/zap/logger_test.go

@@ -0,0 +1,41 @@
+package zap_test
+
+import (
+	"bytes"
+	"context"
+	"testing"
+
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/field"
+	zlog "gitoa.ru/go-4devs/log/handler/zap"
+	"gitoa.ru/go-4devs/log/level"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func TestNew(t *testing.T) {
+	ctx := context.Background()
+	buf := &bytes.Buffer{}
+	core := zapcore.NewCore(zapcore.NewJSONEncoder(zapcore.EncoderConfig{
+		MessageKey:     "msg",
+		LevelKey:       "level",
+		NameKey:        "logger",
+		EncodeLevel:    zapcore.LowercaseLevelEncoder,
+		EncodeTime:     zapcore.ISO8601TimeEncoder,
+		EncodeDuration: zapcore.StringDurationEncoder,
+	}), zapcore.AddSync(buf), zapcore.DebugLevel)
+	logger := zlog.New(zlog.WithZap(zap.New(core)))
+	expect := `{"level":"info","msg":"handle zap message","env":"test"}` + "\n"
+
+	if _, err := logger(ctx, entry.New(
+		entry.WithFields(field.String("env", "test")),
+		entry.WithLevel(level.Notice),
+		entry.WithMessage("handle zap message"),
+	)); err != nil {
+		t.Error(err)
+	}
+
+	if buf.String() != expect {
+		t.Errorf("invalid message\n got: %s\nexpect:%s\n", buf.String(), expect)
+	}
+}

level.go

@@ -1,22 +0,0 @@
-package log
-
-//go:generate stringer -type=Level -linecomment
-
-// Level log.
-type Level uint8
-
-// awailable log levels.
-const (
-	LevelEmergency Level = iota // emergency
-	LevelAlert                  // alert
-	LevelCritical               // critical
-	LevelError                  // error
-	LevelWarning                // warning
-	LevelNotice                 // notice
-	LevelInfo                   // info
-	LevelDebug                  // debug
-)
-
-func (l Level) MarshalJSON() ([]byte, error) {
-	return []byte("\"" + l.String() + "\""), nil
-}

level/level.go

@@ -0,0 +1,73 @@
+package level
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+//go:generate stringer -type=Level -linecomment
+
+var (
+	_ json.Marshaler   = Level(0)
+	_ json.Unmarshaler = (*Level)(nil)
+)
+
+// Level log.
+type Level uint32
+
+// available log levels.
+const (
+	Emergency Level = iota // emergency
+	Alert                  // alert
+	Critical               // critical
+	Error                  // error
+	Warning                // warning
+	Notice                 // notice
+	Info                   // info
+	Debug                  // debug
+)
+
+func (l Level) MarshalJSON() ([]byte, error) {
+	return json.Marshal(l.String())
+}
+
+func (l Level) Is(level Level) bool {
+	return level == l
+}
+
+func (l Level) Enabled(level Level) bool {
+	return l <= level
+}
+
+func (l *Level) UnmarshalJSON(in []byte) error {
+	var v string
+	if err := json.Unmarshal(in, &v); err != nil {
+		return err
+	}
+
+	lvl := Parse(v)
+	*l = lvl
+
+	return nil
+}
+
+func Parse(lvl string) Level {
+	switch strings.ToLower(lvl) {
+	case "debug", "Debug", "DEBUG":
+		return Debug
+	case "info", "Info", "INFO":
+		return Info
+	case "notice", "Notice", "NOTICE":
+		return Notice
+	case "warning", "Warning", "WARNING":
+		return Warning
+	case "error", "Error", "ERROR":
+		return Error
+	case "critical", "Critical", "CRITICAL":
+		return Critical
+	case "alert", "Alert", "ALERT":
+		return Alert
+	default:
+		return Emergency
+	}
+}

level_string.go → level/level_string.go

@@ -1,6 +1,6 @@
 // Code generated by "stringer -type=Level -linecomment"; DO NOT EDIT.
 
-package log
+package level
 
 import "strconv"
 
@@ -8,14 +8,14 @@ func _() {
 	// An "invalid array index" compiler error signifies that the constant values have changed.
 	// Re-run the stringer command to generate them again.
 	var x [1]struct{}
-	_ = x[LevelEmergency-0]
-	_ = x[LevelAlert-1]
-	_ = x[LevelCritical-2]
-	_ = x[LevelError-3]
-	_ = x[LevelWarning-4]
-	_ = x[LevelNotice-5]
-	_ = x[LevelInfo-6]
-	_ = x[LevelDebug-7]
+	_ = x[Emergency-0]
+	_ = x[Alert-1]
+	_ = x[Critical-2]
+	_ = x[Error-3]
+	_ = x[Warning-4]
+	_ = x[Notice-5]
+	_ = x[Info-6]
+	_ = x[Debug-7]
 }
 
 const _Level_name = "emergencyalertcriticalerrorwarningnoticeinfodebug"

logger.go

@@ -2,39 +2,83 @@ package log
 
 import (
 	"context"
+	"errors"
 	"fmt"
+	"io"
+	"os"
+
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
+)
+
+var _ io.Writer = (Logger)(nil)
+
+var (
+	ErrIgnoredKey    = errors.New("ignored key without a value")
+	ErrNonStringKeys = errors.New("ignored key-value pairs with non-string keys")
 )
 
+func writeOutput(_ int, err error) {
+	if err != nil {
+		fmt.Fprint(os.Stderr, err)
+	}
+}
+
 // Logger logged message.
-type Logger func(ctx context.Context, level Level, msg string, fields Fields)
+type Logger func(ctx context.Context, entry *entry.Entry) (int, error)
 
-func (l Logger) log(ctx context.Context, level Level, args ...interface{}) {
-	l(ctx, level, fmt.Sprint(args...), nil)
+func (l Logger) log(ctx context.Context, level level.Level, args ...interface{}) {
+	writeOutput(l.write(ctx, level, fmt.Sprint(args...)))
 }
 
-func (l Logger) logKV(ctx context.Context, level Level, msg string, args ...interface{}) {
-	l(ctx, level, msg, l.kv(ctx, args...))
+func (l Logger) Write(in []byte) (int, error) {
+	return l.write(context.Background(), level.Info, string(in))
 }
 
-func (l Logger) logf(ctx context.Context, level Level, format string, args ...interface{}) {
-	l(ctx, level, fmt.Sprintf(format, args...), nil)
+func (l Logger) write(ctx context.Context, level level.Level, msg string, fields ...field.Field) (int, error) {
+	e := entry.Get()
+
+	defer func() {
+		entry.Put(e)
+	}()
+
+	return l(ctx, e.SetLevel(level).SetMessage(msg).Add(fields...))
 }
 
-func (l Logger) logln(ctx context.Context, level Level, args ...interface{}) {
-	l(ctx, level, fmt.Sprintln(args...), nil)
+func (l Logger) logKVs(ctx context.Context, level level.Level, msg string, args ...interface{}) {
+	writeOutput(l.write(ctx, level, msg, l.kv(ctx, args...)...))
 }
 
-func (l Logger) kv(ctx context.Context, args ...interface{}) []Field {
-	fields := make([]Field, 0, len(args))
+func (l Logger) logKV(ctx context.Context, level level.Level, msg string, fields ...field.Field) {
+	writeOutput(l.write(ctx, level, msg, fields...))
+}
+
+func (l Logger) logf(ctx context.Context, level level.Level, format string, args ...interface{}) {
+	writeOutput(l.write(ctx, level, fmt.Sprintf(format, args...)))
+}
+
+func (l Logger) logln(ctx context.Context, level level.Level, args ...interface{}) {
+	writeOutput(l.write(ctx, level, fmt.Sprintln(args...)))
+}
+
+func (l Logger) kv(ctx context.Context, args ...interface{}) field.Fields {
+	e := entry.Get()
+
+	defer func() {
+		entry.Put(e)
+	}()
 
 	for i := 0; i < len(args); i++ {
-		if f, ok := args[i].(Field); ok {
-			fields = append(fields, f)
+		if f, ok := args[i].(field.Field); ok {
+			e = e.Add(f)
+
 			continue
 		}
 
 		if i == len(args)-1 {
-			l(ctx, LevelCritical, fmt.Sprint("Ignored key without a value.", args[i]), fields)
+			l.logKV(ctx, level.Critical, fmt.Sprint("Ignored key without a value.", args[i]), e.Fields()...)
+
 			break
 		}
 
@@ -42,14 +86,15 @@ func (l Logger) kv(ctx context.Context, args ...interface{}) []Field {
 
 		key, val := args[i-1], args[i]
 		if keyStr, ok := key.(string); ok {
-			fields = append(fields, Field{Key: keyStr, Value: val})
+			e = e.AddAny(keyStr, val)
+
 			continue
 		}
 
-		l(ctx, LevelCritical, fmt.Sprint("Ignored key-value pairs with non-string keys.", key, val), fields)
+		l.logKV(ctx, level.Critical, fmt.Sprint("Ignored key-value pairs with non-string keys.", key, val), e.Fields()...)
 	}
 
-	return fields
+	return e.Fields()
 }
 
 // With adds middlewares to logger.
@@ -59,165 +104,225 @@ func (l Logger) With(mw ...Middleware) Logger {
 
 // Emerg log by emergency level.
 func (l Logger) Emerg(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelEmergency, args...)
+	l.log(ctx, level.Emergency, args...)
 }
 
 // Alert log by alert level.
 func (l Logger) Alert(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelAlert, args...)
+	l.log(ctx, level.Alert, args...)
 }
 
 // Crit log by critical level.
 func (l Logger) Crit(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelCritical, args...)
+	l.log(ctx, level.Critical, args...)
 }
 
 // Err log by error level.
 func (l Logger) Err(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelError, args...)
+	l.log(ctx, level.Error, args...)
 }
 
 // Warn log by warning level.
 func (l Logger) Warn(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelWarning, args...)
+	l.log(ctx, level.Warning, args...)
 }
 
 // Notice log by notice level.
 func (l Logger) Notice(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelNotice, args...)
+	l.log(ctx, level.Notice, args...)
 }
 
 // Info log by info level.
 func (l Logger) Info(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelInfo, args...)
+	l.log(ctx, level.Info, args...)
 }
 
 // Debug log by debug level.
 func (l Logger) Debug(ctx context.Context, args ...interface{}) {
-	l.log(ctx, LevelDebug, args...)
+	l.log(ctx, level.Debug, args...)
 }
 
 // Print log by info level and arguments.
 func (l Logger) Print(args ...interface{}) {
-	l.log(context.Background(), LevelInfo, args...)
+	l.log(context.Background(), level.Info, args...)
 }
 
 // Fatal log by alert level and arguments.
 func (l Logger) Fatal(args ...interface{}) {
-	l.log(context.Background(), LevelAlert, args...)
+	l.log(context.Background(), level.Alert, args...)
 }
 
 // Panic log by emergency level and arguments.
 func (l Logger) Panic(args ...interface{}) {
-	l.log(context.Background(), LevelEmergency, args...)
+	l.log(context.Background(), level.Emergency, args...)
 }
 
 // Println log by info level and arguments.
 func (l Logger) Println(args ...interface{}) {
-	l.logln(context.Background(), LevelInfo, args...)
+	l.logln(context.Background(), level.Info, args...)
 }
 
 // Fatalln log by alert level and arguments.
 func (l Logger) Fatalln(args ...interface{}) {
-	l.logln(context.Background(), LevelAlert, args...)
+	l.logln(context.Background(), level.Alert, args...)
 }
 
 // Panicln log by emergency level and arguments.
 func (l Logger) Panicln(args ...interface{}) {
-	l.logln(context.Background(), LevelEmergency, args...)
+	l.logln(context.Background(), level.Emergency, args...)
+}
+
+// EmergKVs sugared log by emergency level and key-values.
+func (l Logger) EmergKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Emergency, msg, args...)
+}
+
+// AlertKVs sugared log by alert level and key-values.
+func (l Logger) AlertKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Alert, msg, args...)
+}
+
+// CritKVs sugared log by critcal level and key-values.
+func (l Logger) CritKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Critical, msg, args...)
+}
+
+// ErrKVs sugared log by error level and key-values.
+func (l Logger) ErrKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Error, msg, args...)
+}
+
+// WarnKVs sugared log by warning level and key-values.
+func (l Logger) WarnKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Warning, msg, args...)
+}
+
+// NoticeKVs sugared log by notice level and key-values.
+func (l Logger) NoticeKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Notice, msg, args...)
+}
+
+// InfoKVs sugared log by info level and key-values.
+func (l Logger) InfoKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Info, msg, args...)
+}
+
+// DebugKVs sugared log by debug level and key-values.
+func (l Logger) DebugKVs(ctx context.Context, msg string, args ...interface{}) {
+	l.logKVs(ctx, level.Debug, msg, args...)
 }
 
 // EmergKV log by emergency level and key-values.
-func (l Logger) EmergKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelEmergency, msg, args...)
+func (l Logger) EmergKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Emergency, msg, args...)
 }
 
 // AlertKV log by alert level and key-values.
-func (l Logger) AlertKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelAlert, msg, args...)
+func (l Logger) AlertKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Alert, msg, args...)
 }
 
 // CritKV log by critcal level and key-values.
-func (l Logger) CritKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelCritical, msg, args...)
+func (l Logger) CritKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Critical, msg, args...)
 }
 
 // ErrKV log by error level and key-values.
-func (l Logger) ErrKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelError, msg, args...)
+func (l Logger) ErrKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Error, msg, args...)
 }
 
 // WarnKV log by warning level and key-values.
-func (l Logger) WarnKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelWarning, msg, args...)
+func (l Logger) WarnKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Warning, msg, args...)
 }
 
 // NoticeKV log by notice level and key-values.
-func (l Logger) NoticeKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelNotice, msg, args...)
+func (l Logger) NoticeKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Notice, msg, args...)
 }
 
 // InfoKV log by info level and key-values.
-func (l Logger) InfoKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelInfo, msg, args...)
+func (l Logger) InfoKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Info, msg, args...)
 }
 
 // DebugKV log by debug level and key-values.
-func (l Logger) DebugKV(ctx context.Context, msg string, args ...interface{}) {
-	l.logKV(ctx, LevelDebug, msg, args...)
+func (l Logger) DebugKV(ctx context.Context, msg string, args ...field.Field) {
+	l.logKV(ctx, level.Debug, msg, args...)
 }
 
 // Emergf log by emergency level by format and arguments.
 func (l Logger) Emergf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelEmergency, format, args...)
+	l.logf(ctx, level.Emergency, format, args...)
 }
 
 // Alertf log by alert level by format and arguments.
 func (l Logger) Alertf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelAlert, format, args...)
+	l.logf(ctx, level.Alert, format, args...)
 }
 
 // Critf log by critical level by format and arguments.
 func (l Logger) Critf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelCritical, format, args...)
+	l.logf(ctx, level.Critical, format, args...)
 }
 
 // Errf log by error level by format and arguments.
 func (l Logger) Errf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelError, format, args...)
+	l.logf(ctx, level.Error, format, args...)
 }
 
 // Warnf log by warning level by format and arguments.
 func (l Logger) Warnf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelWarning, format, args...)
+	l.logf(ctx, level.Warning, format, args...)
 }
 
 // Noticef log by notice level by format and arguments.
 func (l Logger) Noticef(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelNotice, format, args...)
+	l.logf(ctx, level.Notice, format, args...)
 }
 
 // Infof log by info level by format and arguments.
 func (l Logger) Infof(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelInfo, format, args...)
+	l.logf(ctx, level.Info, format, args...)
 }
 
 // Debugf log by debug level by format and arguments.
 func (l Logger) Debugf(ctx context.Context, format string, args ...interface{}) {
-	l.logf(ctx, LevelDebug, format, args...)
+	l.logf(ctx, level.Debug, format, args...)
 }
 
 // Printf log by info level by format and arguments without context.
 func (l Logger) Printf(format string, args ...interface{}) {
-	l.logf(context.Background(), LevelInfo, format, args...)
+	l.logf(context.Background(), level.Info, format, args...)
 }
 
 // Fatalf log by alert level by format and arguments without context.
 func (l Logger) Fatalf(format string, args ...interface{}) {
-	l.logf(context.Background(), LevelAlert, format, args...)
+	l.logf(context.Background(), level.Alert, format, args...)
 }
 
 // Panicf log by emergency level and arguments without context.
 func (l Logger) Panicf(format string, args ...interface{}) {
-	l.logf(context.Background(), LevelEmergency, format, args...)
+	l.logf(context.Background(), level.Emergency, format, args...)
+}
+
+func (l Logger) Writer(ctx context.Context, level level.Level, fields ...field.Field) io.Writer {
+	return writer{
+		ctx:    ctx,
+		level:  level,
+		Logger: l,
+		fields: fields,
+	}
+}
+
+type writer struct {
+	ctx    context.Context
+	level  level.Level
+	fields []field.Field
+	Logger
+}
+
+func (w writer) Write(in []byte) (int, error) {
+	return w.write(w.ctx, w.level, string(in), w.fields...)
 }

logger_example_caller_test.go

@@ -0,0 +1,20 @@
+package log_test
+
+import (
+	"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.WithCaller("caller", 2, false),
+	)
+	logger.Err(ctx, "same error message")
+	logger.InfoKVs(ctx, "same info message", "api-version", 0.1)
+
+	// Output:
+	// msg="same error message" level=error caller=logger_example_caller_test.go:14
+	// msg="same info message" api-version=0.1 level=info caller=logger_example_caller_test.go:15
+}

logger_example_logrus_test.go

@@ -0,0 +1,21 @@
+package log_test
+
+import (
+	"io"
+
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/handler/zap"
+	uzap "go.uber.org/zap"
+)
+
+func ExampleNew_zapHandler() {
+	log := zap.New(zap.WithZap(uzap.NewExample()))
+	log.Err(ctx, "log zap")
+	log.ErrKV(ctx, "log zap kv", field.Int("int", 42))
+	log.ErrKVs(ctx, "log zap kv sugar", "err", io.EOF)
+
+	// Output:
+	// {"level":"error","msg":"log zap"}
+	// {"level":"error","msg":"log zap kv","int":42}
+	// {"level":"error","msg":"log zap kv sugar","err":"EOF"}
+}

logger_example_test.go

@@ -3,15 +3,23 @@ package log_test
 import (
 	"context"
 	"fmt"
-	std "log"
 	"os"
+	"sync/atomic"
 
 	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
 )
 
 //nolint:gochecknoglobals
 var ctx = context.Background()
 
+func setStdout() {
+	// set stout for example by default stderror
+	log.SetLogger(log.New(log.WithStdout()).With(log.WithLevel("level", level.Debug)))
+}
+
 func ExampleNew() {
 	logger := log.New(log.WithStdout())
 	logger.Info(ctx, "same message")
@@ -19,16 +27,14 @@ func ExampleNew() {
 }
 
 func ExampleInfo() {
-	std.SetOutput(os.Stdout)
-	std.SetFlags(0)
+	setStdout()
 	log.Info(ctx, "same message")
 	// Output: msg="same message" level=info
 }
 
 func ExampleErrKV() {
-	std.SetOutput(os.Stdout)
-	std.SetFlags(0)
-	log.ErrKV(ctx, "same message", "key", "addition value")
+	setStdout()
+	log.ErrKVs(ctx, "same message", "key", "addition value")
 	// Output: msg="same message" key=addition value level=error
 }
 
@@ -39,13 +45,13 @@ func ExampleNew_errf() {
 }
 
 func ExampleNew_debugKV() {
-	logger := log.New(log.WithStdout()).With(log.WithLevel(log.LevelDebug))
-	logger.DebugKV(ctx, "same message", "error", os.ErrNotExist)
+	logger := log.New(log.WithStdout()).With(log.WithLevel("level", 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(log.LevelError))
+	logger := log.New(log.WithStdout()).With(log.WithLevel("level", level.Error))
 	logger.Info(ctx, "same message")
 	// Output:
 
@@ -56,35 +62,25 @@ func ExampleNew_level() {
 func ExampleNew_jsonFormat() {
 	logger := log.New(log.WithStdout(), log.WithJSONFormat()).
 		With(
-			log.WithCaller(4, true),
-			log.WithLevel(log.LevelDebug),
+			log.WithLevel("level", level.Debug),
 			log.GoVersion("go-version"),
 		)
 	logger.Err(ctx, "same error message")
-	// Output: {"caller":"logger_example_test.go:63","go-version":"go1.14.2","level":"error","msg":"same error message"}
+	// Output: {"go-version":"go1.15.2","level":"error","msg":"same error message"}
 }
 
-func ExampleNew_withLogger() {
-	stdlogger := std.New(os.Stdout, "same prefix ", std.Lshortfile)
+func ExampleNew_textEncoding() {
 	logger := log.With(
-		log.New(
-			log.WithLogger(
-				stdlogger,
-				func(msg string, fields log.Fields) string {
-					return fmt.Sprint("msg=\"", msg, "\" ", fields)
-				},
-			),
-			log.WithCalldepth(9),
-		),
-		log.WithLevel(log.LevelDebug),
+		log.New(log.WithStdout()),
+		log.WithLevel("level", level.Debug),
 		log.GoVersion("go-version"),
 	)
 	logger.Err(ctx, "same error message")
-	logger.InfoKV(ctx, "same info message", "api-version", 0.1)
+	logger.InfoKVs(ctx, "same info message", "api-version", 0.1)
 
 	// Output:
-	// same prefix logger_example_test.go:82: msg="same error message" level=error go-version=go1.14.2
-	// same prefix logger_example_test.go:83: msg="same info message" api-version=0.1 level=info go-version=go1.14.2
+	// msg="same error message" level=error go-version=go1.15.2
+	// msg="same info message" api-version=0.1 level=info go-version=go1.15.2
 }
 
 type ctxKey string
@@ -93,8 +89,8 @@ func (c ctxKey) String() string {
 	return string(c)
 }
 
-func levelInfo(ctx context.Context, level log.Level, msg string, fields log.Fields, handler log.Logger) {
-	handler(ctx, level, msg, append(fields, log.Field{Key: "level", Value: level}))
+func levelInfo(ctx context.Context, entry *entry.Entry, handler log.Logger) (int, error) {
+	return handler(ctx, entry.Add(field.String("level", entry.Level().String())))
 }
 
 func ExampleWith() {
@@ -106,7 +102,7 @@ func ExampleWith() {
 		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=go1.14.2
+	// Output: msg="same message" level=info requestID=6a5fa048-7181-11ea-bc55-0242ac130003 api=0.1.0 go=go1.15.2
 }
 
 func ExampleLogger_Print() {
@@ -115,12 +111,31 @@ func ExampleLogger_Print() {
 		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=go1.14.2
+	// Output: msg="same message" level=info client=http api=0.1.0 go=go1.15.2
 }
 
 func ExamplePrint() {
-	std.SetOutput(os.Stdout)
-	std.SetFlags(0)
+	setStdout()
 	log.Print("same message")
 	// Output: msg="same message" level=info
 }
+
+func ExampleWithClosure() {
+	cnt := int32(0)
+	closure := func() string {
+		d := fmt.Sprintf("additional error data: %d", cnt)
+		atomic.AddInt32(&cnt, 1)
+
+		return d
+	}
+
+	log := log.With(log.New(log.WithStdout()), log.WithLevel("level", level.Info), log.WithClosure)
+
+	log.DebugKVs(ctx, "debug message", "data", closure)
+	log.ErrKVs(ctx, "error message", "err", closure)
+	log.WarnKVs(ctx, "warn message", "warn", closure)
+
+	// Output:
+	// msg="error message" err=additional error data: 0 level=error
+	// msg="warn message" warn=additional error data: 1 level=warning
+}

logger_example_trace_test.go

@@ -0,0 +1,62 @@
+package log_test
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/handler/otel"
+	apitrace "go.opentelemetry.io/otel/api/trace"
+	"go.opentelemetry.io/otel/sdk/export/trace"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+func ExampleNew_withTrace() {
+	logger := log.New(log.WithStdout()).With(otel.Middleware())
+
+	sctx, span := startSpan(ctx)
+
+	logger.Err(sctx, "log logrus")
+	logger.ErrKV(sctx, "log logrus kv", field.Int("int", 42))
+	logger.ErrKVs(sctx, "log logrus kv sugar", "err", io.EOF)
+
+	span.End()
+
+	// Output:
+	// msg="log logrus"
+	// msg="log logrus kv" int=42
+	// msg="log logrus kv sugar" err=EOF
+	// event: log logrus, SeverityText = ERROR, SeverityNumber = 17
+	// event: log logrus kv, SeverityText = ERROR, SeverityNumber = 17, int = 42
+	// event: log logrus kv sugar, SeverityText = ERROR, SeverityNumber = 17, err = EOF
+}
+
+func startSpan(ctx context.Context) (context.Context, apitrace.Span) {
+	tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter{}))
+
+	return tp.Tracer("logger").Start(ctx, "operation")
+}
+
+type exporter struct{}
+
+func (e exporter) Shutdown(_ context.Context) error {
+	return nil
+}
+
+func (e exporter) ExportSpans(ctx context.Context, spanData []*trace.SpanData) error {
+	for _, data := range spanData {
+		for _, events := range data.MessageEvents {
+			fmt.Print("event: ", events.Name)
+
+			for _, attr := range events.Attributes {
+				fmt.Printf(", %v = %v", attr.Key, attr.Value.AsInterface())
+			}
+
+			fmt.Print("\n")
+		}
+	}
+
+	return nil
+}

logger_example_zap_test.go

@@ -0,0 +1,28 @@
+package log_test
+
+import (
+	"io"
+	"os"
+
+	slogrus "github.com/sirupsen/logrus"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/handler/logrus"
+)
+
+func ExampleNew_logrusHandler() {
+	lgrs := slogrus.New()
+	lgrs.SetOutput(os.Stdout)
+	lgrs.SetFormatter(&slogrus.TextFormatter{
+		DisableTimestamp: true,
+	})
+
+	log := logrus.New(logrus.WithLogrus(lgrs))
+	log.Err(ctx, "log logrus")
+	log.ErrKV(ctx, "log logrus kv", field.Int("int", 42))
+	log.ErrKVs(ctx, "log logrus kv sugar", "err", io.EOF)
+
+	// Output:
+	// level=error msg="log logrus"
+	// level=error msg="log logrus kv" int=42
+	// level=error msg="log logrus kv sugar" err=EOF
+}

logger_test.go

@@ -4,28 +4,107 @@ import (
 	"bytes"
 	"context"
 	"os"
+	"sync/atomic"
 	"testing"
 
 	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
 )
 
+//nolint:gochecknoglobals
+var requestID ctxKey = "requestID"
+
 func TestFields(t *testing.T) {
 	type rObj struct {
 		id string
 	}
 
+	var cnt int32
+
 	ctx := context.Background()
 	buf := &bytes.Buffer{}
-	log := log.New(log.WithWriter(buf))
-	success := "msg=\"message\" err=file already exists version=0.1.0 obj={id:uid}\n"
+	log := log.New(log.WithWriter(buf)).
+		With(log.WithLevel("level", level.Info), log.WithClosure)
+	success := "msg=\"message\" err=file already exists version=0.1.0 obj={id:uid} closure=some closure data level=info\n"
 
-	log.InfoKV(ctx, "message",
+	log.InfoKVs(ctx, "message",
 		"err", os.ErrExist,
 		"version", "0.1.0",
 		"obj", rObj{id: "uid"},
+		"closure", func() string {
+			atomic.AddInt32(&cnt, 1)
+
+			return "some closure data"
+		},
 	)
 
+	log.DebugKVs(ctx, "debug message",
+		"closure", func() string {
+			atomic.AddInt32(&cnt, 1)
+
+			return "some debug data"
+		},
+	)
+
+	if success != buf.String() {
+		t.Errorf("invalid value\n got:%s\n exp:%s", buf, success)
+	}
+
+	if cnt != 1 {
+		t.Errorf("invalid cnt value\n got:%d\n exp:1", cnt)
+	}
+}
+
+func TestWriter(t *testing.T) {
+	ctx := context.Background()
+
+	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.Writer(
+		context.WithValue(ctx, requestID, "6a5fa048-7181-11ea-bc55-0242ac1311113"),
+		level.Info,
+		field.Error("err", os.ErrExist),
+	).Write([]byte("info message"))
+
 	if success != buf.String() {
 		t.Errorf("invalid value\n got:%s\n exp:%s", buf, success)
 	}
+
+	buf.Reset()
+
+	_, _ = logger.Writer(ctx, level.Debug).Write([]byte("debug message"))
+
+	if buf.String() != "" {
+		t.Errorf("invalid value\n got:%s\n exp:%s", buf, success)
+	}
+}
+
+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))
+
+	_, err := logger(ctx, nil)
+	if err != nil {
+		t.Fatalf("expected <nil> err, got: %v", err)
+	}
+
+	if buf.String() != "" {
+		t.Errorf("invalid value\n got:%+v\n exp:\"\"", buf)
+	}
+
+	_, err = logger(ctx, entry.New().SetLevel(level.Error))
+	if err != nil {
+		t.Fatalf("expected <nil> err, got: %v", err)
+	}
+
+	success := "msg=\"\" requestID=<nil> level=error\n"
+
+	if buf.String() != success {
+		t.Errorf("invalid value\n got:%+v\n exp:%+v", buf, success)
+	}
 }

middleware.go

@@ -3,13 +3,19 @@ package log
 import (
 	"context"
 	"fmt"
-	"path/filepath"
+	"os"
 	"runtime"
 	"time"
+
+	"gitoa.ru/go-4devs/log/entry"
+	"gitoa.ru/go-4devs/log/field"
+	"gitoa.ru/go-4devs/log/level"
 )
 
+var _ Middleware = WithClosure
+
 // Middleware handle.
-type Middleware func(ctx context.Context, level Level, msg string, fields Fields, handler Logger)
+type Middleware func(ctx context.Context, e *entry.Entry, handler Logger) (int, error)
 
 // With add middleware to logger.
 func With(logger Logger, mw ...Middleware) Logger {
@@ -17,95 +23,129 @@ func With(logger Logger, mw ...Middleware) Logger {
 	case 0:
 		return logger
 	case 1:
-		return func(ctx context.Context, level Level, msg string, fields Fields) {
-			mw[0](ctx, level, msg, fields, logger)
+		return func(ctx context.Context, entry *entry.Entry) (int, error) {
+			return mw[0](ctx, entry, logger)
 		}
 	}
 
 	lastI := len(mw) - 1
 
-	return func(ctx context.Context, level Level, msg string, fields Fields) {
+	return func(ctx context.Context, e *entry.Entry) (int, error) {
 		var (
-			chainHandler func(ctx context.Context, level Level, msg string, fields Fields)
+			chainHandler func(context.Context, *entry.Entry) (int, error)
 			curI         int
 		)
 
-		chainHandler = func(currentCtx context.Context, currentLevel Level, currentMsg string, currentFields Fields) {
+		chainHandler = func(currentCtx context.Context, currentEntry *entry.Entry) (int, error) {
 			if curI == lastI {
-				logger(currentCtx, currentLevel, currentMsg, currentFields)
-				return
+				return logger(currentCtx, currentEntry)
 			}
 			curI++
-			mw[curI](currentCtx, currentLevel, currentMsg, currentFields, chainHandler)
+			n, err := mw[curI](currentCtx, currentEntry, chainHandler)
 			curI--
+
+			return n, err
 		}
 
-		mw[0](ctx, level, msg, fields, chainHandler)
+		return mw[0](ctx, e, chainHandler)
 	}
 }
 
 // WithLevel sets log level.
-func WithLevel(lvl Level) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		if level <= lvl {
-			handler(ctx, level, msg, append(fields, Field{Key: "level", Value: level}))
+func WithLevel(key string, lvl level.Level) Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		if e.Level().Enabled(lvl) {
+			return handler(ctx, e.AddString(key, e.Level().String()))
 		}
+
+		return 0, nil
 	}
 }
 
+func WithClosure(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+	for i, field := range e.Fields() {
+		if field.Type().IsAny() {
+			if f, ok := field.AsInterface().(func() string); ok {
+				e.Fields().Set(i, field.Key().String(f()))
+			}
+		}
+	}
+
+	return handler(ctx, e)
+}
+
 // KeyValue add field by const key value.
 func KeyValue(key string, value interface{}) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		handler(ctx, level, msg, append(fields, Field{Key: key, Value: value}))
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		return handler(ctx, e.AddAny(key, value))
 	}
 }
 
 // GoVersion add field by go version.
 func GoVersion(key string) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		handler(ctx, level, msg, append(fields, Field{Key: key, Value: runtime.Version()}))
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		return handler(ctx, e.AddString(key, runtime.Version()))
 	}
 }
 
 // WithContext add field by context key.
 func WithContextValue(keys ...fmt.Stringer) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		ctxFields := make(Fields, len(keys))
-		for i, key := range keys {
-			ctxFields[i] = Field{Key: key.String(), Value: ctx.Value(key)}
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		for _, key := range keys {
+			e = e.AddAny(key.String(), ctx.Value(key))
 		}
 
-		handler(ctx, level, msg, append(fields, ctxFields...))
+		return handler(ctx, e)
 	}
 }
 
 // WithCaller adds called file.
-func WithCaller(calldepth int, short bool) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		_, file, line, ok := runtime.Caller(calldepth)
-		if !ok {
-			file, line = "???", 0
-		}
-
-		if short && ok {
-			file = filepath.Base(file)
-		}
+func WithCaller(key string, depth int, full bool) Middleware {
+	const offset = 2
 
-		handler(ctx, level, msg, append(fields, NewField("caller", fmt.Sprint(file, ":", line))))
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		return handler(ctx, e.AddString(key, entry.Caller(depth*offset, full)))
 	}
 }
 
 // WithTime adds time.
-func WithTime(format string) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		handler(ctx, level, msg, append(fields, NewField("time", time.Now().Format(format))))
+func WithTime(key, format string) Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		return handler(ctx, e.Add(field.Time(key, time.Now())))
 	}
 }
 
 // WithMetrics adds handle metrics.
-func WithMetrics(metrics func(level Level)) Middleware {
-	return func(ctx context.Context, level Level, msg string, fields Fields, handler Logger) {
-		go metrics(level)
-		handler(ctx, level, msg, fields)
+func WithMetrics(metrics func(level level.Level)) Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		go metrics(e.Level())
+
+		return handler(ctx, e)
+	}
+}
+
+// WithExit exit by level.
+func WithExit(level level.Level) Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		n, err := handler(ctx, e)
+
+		if e.Level().Is(level) {
+			os.Exit(1)
+		}
+
+		return n, err
+	}
+}
+
+// WithPanic panic by level.
+func WithPanic(level level.Level) Middleware {
+	return func(ctx context.Context, e *entry.Entry, handler Logger) (int, error) {
+		n, err := handler(ctx, e)
+
+		if e.Level().Is(level) {
+			panic(e.String())
+		}
+
+		return n, err
 	}
 }

std.go

@@ -1,121 +0,0 @@
-package log
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"log"
-	"os"
-)
-
-const (
-	calldepth = 3
-)
-
-// New creates standart logger.
-func New(opts ...Option) Logger {
-	logger := logger{
-		format:    stringFormat,
-		output:    log.Output,
-		calldepth: calldepth,
-	}
-
-	for _, opt := range opts {
-		opt(&logger)
-	}
-
-	return func(ctx context.Context, level Level, msg string, fields Fields) {
-		_ = logger.output(logger.calldepth, logger.format(msg, fields))
-
-		switch level {
-		case LevelEmergency:
-			panic(msg)
-		case LevelAlert:
-			os.Exit(1)
-		default:
-		}
-	}
-}
-
-// Option configure log.
-type Option func(*logger)
-
-// Format sets formats output message.
-type Format func(msg string, fields Fields) string
-
-type logger struct {
-	output    func(calldepth int, s string) error
-	format    Format
-	calldepth int
-}
-
-// WithWriter sets writer logger.
-func WithWriter(writer io.Writer) Option {
-	return func(l *logger) {
-		l.output = log.New(writer, "", 0).Output
-	}
-}
-
-// WithStdout sets logged to os.Stdout.
-func WithStdout() Option {
-	return func(l *logger) {
-		l.output = log.New(os.Stdout, "", 0).Output
-	}
-}
-
-// WithFormat sets format log.
-func WithFormat(format Format) Option {
-	return func(l *logger) {
-		l.format = format
-	}
-}
-
-// WithStringFormat sets format as simple string.
-func WithStringFormat() Option {
-	return func(l *logger) {
-		l.format = stringFormat
-	}
-}
-
-// WithJSONFormat sets json output format.
-func WithJSONFormat() Option {
-	return func(l *logger) {
-		l.format = jsonFormat
-	}
-}
-
-// WithCalldepth sets depth filename.
-func WithCalldepth(calldepth int) Option {
-	return func(l *logger) {
-		l.calldepth = calldepth
-	}
-}
-
-// WithLogger sets logger anf format.
-func WithLogger(std *log.Logger, format Format) Option {
-	return func(l *logger) {
-		l.output = std.Output
-		l.format = format
-	}
-}
-
-func stringFormat(msg string, fields Fields) string {
-	return fmt.Sprint("msg=\"", msg, "\" ", fields)
-}
-
-func jsonFormat(msg string, fields Fields) string {
-	data := make(map[string]interface{}, len(fields)+1)
-	data["msg"] = msg
-
-	for _, field := range fields {
-		data[field.Key] = field.Value
-	}
-
-	res, err := json.Marshal(data)
-	if err != nil {
-		return stringFormat(msg, append(fields, FieldError(err)))
-	}
-
-	return string(res)
-}

writter.go

@@ -0,0 +1,118 @@
+package log
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"io"
+	"os"
+	"strings"
+	"sync"
+
+	"gitoa.ru/go-4devs/log/entry"
+)
+
+// New creates standart logger.
+func New(opts ...Option) Logger {
+	l := log{e: stringFormat(), w: os.Stderr}
+
+	for _, opt := range opts {
+		opt(&l)
+	}
+
+	return func(_ context.Context, entry *entry.Entry) (int, error) {
+		b, err := l.e(entry)
+		if err != nil {
+			return 0, err
+		}
+
+		return l.w.Write(b)
+	}
+}
+
+// Option configure log.
+type Option func(*log)
+
+// Encode sets formats and encode output message.
+type Encode func(*entry.Entry) ([]byte, error)
+
+type log struct {
+	w io.Writer
+	e Encode
+}
+
+// WithWriter sets writer logger.
+func WithWriter(writer io.Writer) Option {
+	return func(l *log) {
+		l.w = writer
+	}
+}
+
+// WithStdout sets logged to os.Stdout.
+func WithStdout() Option {
+	return func(l *log) {
+		l.w = os.Stdout
+	}
+}
+
+// WithEncode sets format log.
+func WithEncode(e Encode) Option {
+	return func(l *log) {
+		l.e = e
+	}
+}
+
+// WithStringFormat sets format as simple string.
+func WithStringFormat() Option {
+	return func(l *log) {
+		l.e = stringFormat()
+	}
+}
+
+// WithJSONFormat sets json output format.
+func WithJSONFormat() Option {
+	return func(l *log) {
+		l.e = jsonFormat
+	}
+}
+
+func stringFormat() func(entry *entry.Entry) ([]byte, error) {
+	pool := sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+
+	return func(entry *entry.Entry) ([]byte, error) {
+		b := pool.Get().(*bytes.Buffer)
+		b.Reset()
+
+		defer func() {
+			pool.Put(b)
+		}()
+
+		b.WriteString("msg=\"")
+		b.WriteString(strings.TrimSpace(entry.Message()))
+		b.WriteString("\"")
+
+		for _, field := range entry.Fields() {
+			b.WriteString(" ")
+			b.WriteString(string(field.Key()))
+			b.WriteString("=")
+			b.WriteString(field.Value().String())
+		}
+
+		b.WriteString("\n")
+
+		return b.Bytes(), nil
+	}
+}
+
+func jsonFormat(entry *entry.Entry) ([]byte, error) {
+	res, err := json.Marshal(entry.AddString("msg", entry.Message()).Fields().AsMap())
+	if err != nil {
+		return nil, err
+	}
+
+	return append(res, []byte("\n")...), nil
+}