diff --git a/pkg/log/config.go b/pkg/log/config.go
index c79ca54..769deb5 100644
--- a/pkg/log/config.go
+++ b/pkg/log/config.go
@@ -23,6 +23,7 @@ var (
 	loggerFileMapMutex sync.Mutex
 )
 
+// Cfg is the log config
 type Cfg struct {
 	Level   string `yaml:"level"`
 	File    string `yaml:"file"`
@@ -44,6 +45,7 @@ func init() {
 	Config(v)
 }
 
+// Config for log configuration
 func Config(v *viper.Viper) {
 	if err := v.UnmarshalKey("log", &cfg); err != nil {
 		Fatal("parse log config", zap.Error(err))
@@ -66,6 +68,7 @@ func Config(v *viper.Viper) {
 	logger = newLogger(zaplogger)
 }
 
+// NewLoggerFile create a new logger with file and use the global log configuration
 func NewLogger(file string) (Logger, error) {
 	c := cfg
 	if c.File == file {
diff --git a/pkg/log/echo_logger.go b/pkg/log/echo_logger.go
index 9688777..2032b27 100644
--- a/pkg/log/echo_logger.go
+++ b/pkg/log/echo_logger.go
@@ -10,131 +10,163 @@ import (
 	"github.com/labstack/gommon/log"
 )
 
+// EchoLogger echo logger
+// see echo.Logger
 type EchoLogger struct {
 	prefix string
 	logger Logger
 }
 
+// NewEchoLogger crate new echo log instance
 func NewEchoLogger() *EchoLogger {
 	return &EchoLogger{
 		logger: Named(""),
 	}
 }
 
+// For with context.Context
 func (t *EchoLogger) For(ctx context.Context) *EchoLogger {
 	return &EchoLogger{prefix: t.prefix, logger: t.logger.For(ctx)}
 }
 
+// Output get output
 func (t *EchoLogger) Output() io.Writer {
 	return nil
 }
 
+// SetOutput not implemented, ignored
 func (t *EchoLogger) SetOutput(w io.Writer) {}
 
+// Prefix get prefix
 func (t *EchoLogger) Prefix() string {
 	return t.prefix
 }
 
+// SetOutput set output prefix
 func (t *EchoLogger) SetPrefix(p string) {
 	t.prefix = p
 	t.logger = Named(p)
 }
 
+// Level get log level
 func (t *EchoLogger) Level() log.Lvl {
 	return log.INFO
 }
 
+// SetLvl set log level
 func (t *EchoLogger) SetLevel(v log.Lvl) {}
 
+// SetHeader set header, not implemented
 func (t *EchoLogger) SetHeader(h string) {}
 
+// Print log
 func (t *EchoLogger) Print(i ...interface{}) {
 	t.logger.Info(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Printf log formatted
 func (t *EchoLogger) Printf(format string, args ...interface{}) {
 	t.logger.Info(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Printj log json formatted
 func (t *EchoLogger) Printj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Info(strings.TrimSpace(string(b)))
 }
 
+// Debug log debug message
 func (t *EchoLogger) Debug(i ...interface{}) {
 	t.logger.Debug(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Debugf log debug formatted message
 func (t *EchoLogger) Debugf(format string, args ...interface{}) {
 	t.logger.Debug(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Debugj log json formatted
 func (t *EchoLogger) Debugj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Debug(strings.TrimSpace(string(b)))
 }
 
+// Info log
 func (t *EchoLogger) Info(i ...interface{}) {
 	t.logger.Info(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Infof log formatted
 func (t *EchoLogger) Infof(format string, args ...interface{}) {
 	t.logger.Info(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Infoj log json
 func (t *EchoLogger) Infoj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Info(strings.TrimSpace(string(b)))
 }
 
+// Warn log warn message
 func (t *EchoLogger) Warn(i ...interface{}) {
 	t.logger.Warn(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Warnf log warn formatted message
 func (t *EchoLogger) Warnf(format string, args ...interface{}) {
 	t.logger.Warn(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Warnj log warn json
 func (t *EchoLogger) Warnj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Warn(strings.TrimSpace(string(b)))
 }
 
+// Error log error message
 func (t *EchoLogger) Error(i ...interface{}) {
 	t.logger.Error(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Errorf log error formatted message
 func (t *EchoLogger) Errorf(format string, args ...interface{}) {
 	t.logger.Error(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Errorj log error json
 func (t *EchoLogger) Errorj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Error(strings.TrimSpace(string(b)))
 }
 
+// Fatal log fatal message
 func (t *EchoLogger) Fatal(i ...interface{}) {
 	t.logger.Error(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Fatalj log fatal json message
 func (t *EchoLogger) Fatalj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Error(strings.TrimSpace(string(b)))
 }
 
+// Fatalf log formatted message
 func (t *EchoLogger) Fatalf(format string, args ...interface{}) {
 	t.logger.Error(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
 
+// Panic log panic message, which will cause panic
 func (t *EchoLogger) Panic(i ...interface{}) {
 	t.logger.Fatal(strings.TrimSpace(fmt.Sprintln(i...)))
 }
 
+// Panicj log panic json message, which will cause panic
 func (t *EchoLogger) Panicj(j log.JSON) {
 	b, _ := json.Marshal(j)
 	t.logger.Fatal(strings.TrimSpace(string(b)))
 }
 
+// Panicf log formatted message, which will cause panic
 func (t *EchoLogger) Panicf(format string, args ...interface{}) {
 	t.logger.Fatal(strings.TrimSpace(fmt.Sprintf(format, args...)))
 }
diff --git a/pkg/log/log.go b/pkg/log/log.go
index c935c69..6b12063 100644
--- a/pkg/log/log.go
+++ b/pkg/log/log.go
@@ -6,38 +6,48 @@ import (
 	"go.uber.org/zap"
 )
 
+// Named name log
+// see zap log named
 func Named(name string) Logger {
 	return logger.Named(name)
 }
 
+// Debug log message
 func Debug(msg string, fields ...zap.Field) {
 	logger.Debug(msg, fields...)
 }
 
+// Info log message
 func Info(msg string, fields ...zap.Field) {
 	logger.Info(msg, fields...)
 }
 
+// Warn log message
 func Warn(msg string, fields ...zap.Field) {
 	logger.Warn(msg, fields...)
 }
 
+// Error log message
 func Error(msg string, fields ...zap.Field) {
 	logger.Error(msg, fields...)
 }
 
+// Fatal log message
 func Fatal(msg string, fields ...zap.Field) {
 	logger.Fatal(msg, fields...)
 }
 
+// With log message
 func With(fields ...zap.Field) Logger {
 	return logger.With(fields...)
 }
 
+// For log with context.Context, which will log trace_id and span_id if opentracing enabled
 func For(ctx context.Context) Logger {
 	return logger.For(ctx)
 }
 
+// Get get zap log instance (global instance only)
 func Get() *zap.Logger {
 	return zaplogger
 }
diff --git a/pkg/log/logger.go b/pkg/log/logger.go
index dbbf2de..1120019 100644
--- a/pkg/log/logger.go
+++ b/pkg/log/logger.go
@@ -9,24 +9,44 @@ import (
 	"go.uber.org/zap/zapcore"
 )
 
+// Logger log interface definition
 type Logger interface {
+	// Named see zap Named
 	Named(name string) Logger
+
+	// Debug log message
 	Debug(msg string, fields ...zapcore.Field)
+
+	// Info log message
 	Info(msg string, fields ...zapcore.Field)
+
+	// Warn log message
 	Warn(msg string, fields ...zapcore.Field)
+
+	// Error log message
 	Error(msg string, fields ...zapcore.Field)
+
+	// Fatal log message
 	Fatal(msg string, fields ...zapcore.Field)
+
+	// With add zap fields
 	With(fields ...zapcore.Field) Logger
+
+	// For log with context.Context, which will log trace_id and span_id if opentracing enabled
 	For(ctx context.Context) Logger
+
+	// CallerSkip skip caller for adjust caller
 	CallerSkip(int) Logger
 }
 
+// default logger implementation
 type defaultLogger struct {
 	logger           *zap.Logger
 	additionalFields []zapcore.Field
 	skiped           bool
 }
 
+// newLogger new logger instance
 func newLogger(l *zap.Logger) Logger {
 	return &defaultLogger{
 		logger:           l,
@@ -34,31 +54,38 @@ func newLogger(l *zap.Logger) Logger {
 	}
 }
 
+// Named see zap Named
 func (t defaultLogger) Named(name string) Logger {
 	t.logger = t.logger.Named(name)
 	return t
 }
 
+// Debug log message
 func (t defaultLogger) Debug(msg string, fields ...zapcore.Field) {
 	t.logger.Debug(msg, fields...)
 }
 
+// Info log message
 func (t defaultLogger) Info(msg string, fields ...zapcore.Field) {
 	t.logger.Info(msg, fields...)
 }
 
+// Warn log message
 func (t defaultLogger) Warn(msg string, fields ...zapcore.Field) {
 	t.logger.Warn(msg, fields...)
 }
 
+// Error log message
 func (t defaultLogger) Error(msg string, fields ...zapcore.Field) {
 	t.logger.Error(msg, fields...)
 }
 
+// Fatal log message
 func (t defaultLogger) Fatal(msg string, fields ...zapcore.Field) {
 	t.logger.Fatal(msg, fields...)
 }
 
+// With add zap fields
 func (t defaultLogger) With(fields ...zapcore.Field) Logger {
 	return defaultLogger{
 		logger:           t.logger.WithOptions(zap.AddCallerSkip(t.skip())).With(fields...),
@@ -67,6 +94,7 @@ func (t defaultLogger) With(fields ...zapcore.Field) Logger {
 	}
 }
 
+// For log with context.Context, which will log trace_id and span_id if opentracing enabled
 func (t defaultLogger) For(ctx context.Context) Logger {
 	if span := opentracing.SpanFromContext(ctx); span != nil {
 		l := spanLogger{span: span, logger: t.logger.WithOptions(zap.AddCallerSkip(t.skip())), additionalFields: t.additionalFields}
@@ -84,6 +112,7 @@ func (t defaultLogger) For(ctx context.Context) Logger {
 	return defaultLogger{logger: t.logger.WithOptions(zap.AddCallerSkip(-1))}
 }
 
+// CallerSkip skip caller for adjust caller
 func (t defaultLogger) CallerSkip(skip int) Logger {
 	t.logger = t.logger.WithOptions(zap.AddCallerSkip(skip))
 	return t
diff --git a/pkg/log/spanlogger.go b/pkg/log/spanlogger.go
index ddb2dc1..6d93bfb 100644
--- a/pkg/log/spanlogger.go
+++ b/pkg/log/spanlogger.go
@@ -20,11 +20,14 @@ type spanLogger struct {
 	additionalFields []zapcore.Field
 }
 
+// Named name log
+// see zap log named
 func (t spanLogger) Named(name string) Logger {
 	t.logger = t.logger.Named(name)
 	return t
 }
 
+// Debug log message
 func (t spanLogger) Debug(msg string, fields ...zapcore.Field) {
 	if t.logger.Core().Enabled(zap.DebugLevel) {
 		t.logToSpan("debug", msg, append(t.additionalFields, fields...)...)
@@ -32,6 +35,7 @@ func (t spanLogger) Debug(msg string, fields ...zapcore.Field) {
 	t.logger.Debug(msg, append(t.spanFields, fields...)...)
 }
 
+// Info log message
 func (t spanLogger) Info(msg string, fields ...zapcore.Field) {
 	if t.logger.Core().Enabled(zap.InfoLevel) {
 		t.logToSpan("info", msg, append(t.additionalFields, fields...)...)
@@ -39,23 +43,27 @@ func (t spanLogger) Info(msg string, fields ...zapcore.Field) {
 	t.logger.Info(msg, append(t.spanFields, fields...)...)
 }
 
+// Warn log message
 func (t spanLogger) Warn(msg string, fields ...zapcore.Field) {
 	t.logToSpan("warn", msg, append(t.additionalFields, fields...)...)
 	t.logger.Warn(msg, append(t.spanFields, fields...)...)
 }
 
+// Error log message
 func (t spanLogger) Error(msg string, fields ...zapcore.Field) {
 	t.logToSpan("error", msg, fields...)
 	ext.Error.Set(t.span, true)
 	t.logger.Error(msg, append(t.spanFields, fields...)...)
 }
 
+// Fatal log message
 func (t spanLogger) Fatal(msg string, fields ...zapcore.Field) {
 	t.logToSpan("fatal", msg, append(t.additionalFields, fields...)...)
 	ext.Error.Set(t.span, true)
 	t.logger.Fatal(msg, append(t.spanFields, fields...)...)
 }
 
+// With add zap fields
 func (t spanLogger) With(fields ...zapcore.Field) Logger {
 	return spanLogger{
 		logger:           t.logger.With(fields...),
@@ -65,10 +73,12 @@ func (t spanLogger) With(fields ...zapcore.Field) Logger {
 	}
 }
 
+// For log with context.Context, which will log trace_id and span_id if opentracing enabled
 func (t spanLogger) For(context.Context) Logger {
 	return t
 }
 
+// CallerSkip skip caller for adjust caller
 func (t spanLogger) CallerSkip(skip int) Logger {
 	t.logger = t.logger.WithOptions(zap.AddCallerSkip(skip))
 	return t