micro/logger/slog/slog.go

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package slog
import (
"context"
"fmt"
"log/slog"
"os"
"runtime"
"strconv"
"sync"
"time"
"go.unistack.org/micro/v3/logger"
"go.unistack.org/micro/v3/tracer"
)
var (
DefaultSourceKey string = slog.SourceKey
DefaultTimeKey string = slog.TimeKey
DefaultMessageKey string = slog.MessageKey
DefaultLevelKey string = slog.LevelKey
)
var (
traceValue = slog.StringValue("trace")
debugValue = slog.StringValue("debug")
infoValue = slog.StringValue("info")
warnValue = slog.StringValue("warn")
errorValue = slog.StringValue("error")
fatalValue = slog.StringValue("fatal")
)
func (s *slogLogger) renameAttr(_ []string, a slog.Attr) slog.Attr {
switch a.Key {
case slog.SourceKey:
source := a.Value.Any().(*slog.Source)
a.Value = slog.StringValue(source.File + ":" + strconv.Itoa(source.Line))
a.Key = s.sourceKey
case slog.TimeKey:
a.Key = s.timeKey
case slog.MessageKey:
a.Key = s.messageKey
case slog.LevelKey:
level := a.Value.Any().(slog.Level)
lvl := slogToLoggerLevel(level)
a.Key = s.levelKey
switch {
case lvl < logger.DebugLevel:
a.Value = traceValue
case lvl < logger.InfoLevel:
a.Value = debugValue
case lvl < logger.WarnLevel:
a.Value = infoValue
case lvl < logger.ErrorLevel:
a.Value = warnValue
case lvl < logger.FatalLevel:
a.Value = errorValue
case lvl >= logger.FatalLevel:
a.Value = fatalValue
default:
a.Value = infoValue
}
}
return a
}
type slogLogger struct {
slog *slog.Logger
leveler *slog.LevelVar
levelKey string
messageKey string
sourceKey string
timeKey string
opts logger.Options
mu sync.RWMutex
}
func (s *slogLogger) Clone(opts ...logger.Option) logger.Logger {
s.mu.RLock()
options := s.opts
for _, o := range opts {
o(&options)
}
l := &slogLogger{
opts: options,
levelKey: s.levelKey,
messageKey: s.messageKey,
sourceKey: s.sourceKey,
timeKey: s.timeKey,
}
if v, ok := l.opts.Context.Value(levelKey{}).(string); ok && v != "" {
l.levelKey = v
}
if v, ok := l.opts.Context.Value(messageKey{}).(string); ok && v != "" {
l.messageKey = v
}
if v, ok := l.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
l.sourceKey = v
}
if v, ok := l.opts.Context.Value(timeKey{}).(string); ok && v != "" {
l.timeKey = v
}
l.leveler = new(slog.LevelVar)
handleOpt := &slog.HandlerOptions{
ReplaceAttr: s.renameAttr,
Level: l.leveler,
AddSource: true,
}
l.leveler.Set(loggerToSlogLevel(l.opts.Level))
handler := slog.NewJSONHandler(options.Out, handleOpt)
l.slog = slog.New(handler).With(options.Fields...)
s.mu.RUnlock()
return l
}
func (s *slogLogger) V(level logger.Level) bool {
return s.opts.Level.Enabled(level)
}
func (s *slogLogger) Level(level logger.Level) {
s.leveler.Set(loggerToSlogLevel(level))
}
func (s *slogLogger) Options() logger.Options {
return s.opts
}
func (s *slogLogger) Fields(attrs ...interface{}) logger.Logger {
s.mu.RLock()
nl := &slogLogger{
opts: s.opts,
levelKey: s.levelKey,
messageKey: s.messageKey,
sourceKey: s.sourceKey,
timeKey: s.timeKey,
}
nl.leveler = new(slog.LevelVar)
nl.leveler.Set(s.leveler.Level())
handleOpt := &slog.HandlerOptions{
ReplaceAttr: nl.renameAttr,
Level: nl.leveler,
AddSource: true,
}
handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
nl.slog = slog.New(handler).With(attrs...)
s.mu.RUnlock()
return nl
}
func (s *slogLogger) Init(opts ...logger.Option) error {
s.mu.Lock()
for _, o := range opts {
o(&s.opts)
}
if v, ok := s.opts.Context.Value(levelKey{}).(string); ok && v != "" {
s.levelKey = v
}
if v, ok := s.opts.Context.Value(messageKey{}).(string); ok && v != "" {
s.messageKey = v
}
if v, ok := s.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
s.sourceKey = v
}
if v, ok := s.opts.Context.Value(timeKey{}).(string); ok && v != "" {
s.timeKey = v
}
s.leveler = new(slog.LevelVar)
handleOpt := &slog.HandlerOptions{
ReplaceAttr: s.renameAttr,
Level: s.leveler,
AddSource: true,
}
s.leveler.Set(loggerToSlogLevel(s.opts.Level))
handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
s.slog = slog.New(handler).With(s.opts.Fields...)
slog.SetDefault(s.slog)
s.mu.Unlock()
return nil
}
func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, attrs ...interface{}) {
if !s.V(lvl) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), loggerToSlogLevel(lvl), fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Logf(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
if !s.V(lvl) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), loggerToSlogLevel(lvl), fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Info(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.InfoLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelInfo, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Infof(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.InfoLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelInfo, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Debug(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.DebugLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelDebug, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Debugf(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.DebugLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelDebug, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Trace(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.TraceLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelDebug-1, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Tracef(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.TraceLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelDebug-1, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Error(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.ErrorLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelError, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
r.Attrs(func(a slog.Attr) bool {
if a.Key == "error" {
if span, ok := tracer.SpanFromContext(ctx); ok {
span.SetStatus(tracer.SpanStatusError, a.Value.String())
return false
}
}
return true
})
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Errorf(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.ErrorLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelError, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
r.Attrs(func(a slog.Attr) bool {
if a.Key == "error" {
if span, ok := tracer.SpanFromContext(ctx); ok {
span.SetStatus(tracer.SpanStatusError, a.Value.String())
return false
}
}
return true
})
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Fatal(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.FatalLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelError+1, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
os.Exit(1)
}
func (s *slogLogger) Fatalf(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.FatalLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelError+1, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
os.Exit(1)
}
func (s *slogLogger) Warn(ctx context.Context, attrs ...interface{}) {
if !s.V(logger.WarnLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelWarn, fmt.Sprintf("%s", attrs[0]), pcs[0])
// r.Add(attrs[1:]...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) Warnf(ctx context.Context, msg string, attrs ...interface{}) {
if !s.V(logger.WarnLevel) {
return
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelWarn, fmt.Sprintf(msg, attrs...), pcs[0])
// r.Add(attrs...)
_ = s.slog.Handler().Handle(ctx, r)
}
func (s *slogLogger) String() string {
return "slog"
}
func NewLogger(opts ...logger.Option) logger.Logger {
s := &slogLogger{
opts: logger.NewOptions(opts...),
sourceKey: DefaultSourceKey,
timeKey: DefaultTimeKey,
messageKey: DefaultMessageKey,
levelKey: DefaultLevelKey,
}
if v, ok := s.opts.Context.Value(levelKey{}).(string); ok && v != "" {
s.levelKey = v
}
if v, ok := s.opts.Context.Value(messageKey{}).(string); ok && v != "" {
s.messageKey = v
}
if v, ok := s.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
s.sourceKey = v
}
if v, ok := s.opts.Context.Value(timeKey{}).(string); ok && v != "" {
s.timeKey = v
}
return s
}
func loggerToSlogLevel(level logger.Level) slog.Level {
switch level {
case logger.DebugLevel:
return slog.LevelDebug
case logger.WarnLevel:
return slog.LevelWarn
case logger.ErrorLevel:
return slog.LevelError
case logger.TraceLevel:
return slog.LevelDebug - 1
case logger.FatalLevel:
return slog.LevelError + 1
default:
return slog.LevelInfo
}
}
func slogToLoggerLevel(level slog.Level) logger.Level {
switch level {
case slog.LevelDebug:
return logger.DebugLevel
case slog.LevelWarn:
return logger.WarnLevel
case slog.LevelError:
return logger.ErrorLevel
case slog.LevelDebug - 1:
return logger.TraceLevel
case slog.LevelError + 1:
return logger.FatalLevel
default:
return logger.InfoLevel
}
}