micro/logger/slog/slog.go

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package slog
import (
"context"
"log/slog"
"os"
"regexp"
"runtime"
"strconv"
"sync"
"go.unistack.org/micro/v3/logger"
"go.unistack.org/micro/v3/semconv"
"go.unistack.org/micro/v3/tracer"
)
const (
badKey = "!BADKEY"
// defaultCallerSkipCount used by logger
defaultCallerSkipCount = 3
)
var reTrace = regexp.MustCompile(`.*/slog/logger\.go.*\n`)
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.opts.SourceKey
case slog.TimeKey:
a.Key = s.opts.TimeKey
case slog.MessageKey:
a.Key = s.opts.MessageKey
case slog.LevelKey:
level := a.Value.Any().(slog.Level)
lvl := slogToLoggerLevel(level)
a.Key = s.opts.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 {
leveler *slog.LevelVar
handler slog.Handler
opts logger.Options
mu sync.RWMutex
}
func (s *slogLogger) Clone(opts ...logger.Option) logger.Logger {
s.mu.RLock()
options := s.opts
s.mu.RUnlock()
for _, o := range opts {
o(&options)
}
l := &slogLogger{
opts: options,
}
l.leveler = new(slog.LevelVar)
handleOpt := &slog.HandlerOptions{
ReplaceAttr: l.renameAttr,
Level: l.leveler,
AddSource: l.opts.AddSource,
}
l.leveler.Set(loggerToSlogLevel(l.opts.Level))
l.handler = slog.New(slog.NewJSONHandler(options.Out, handleOpt)).With(options.Fields...).Handler()
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()
level := s.leveler.Level()
options := s.opts
s.mu.RUnlock()
l := &slogLogger{opts: options}
l.leveler = new(slog.LevelVar)
l.leveler.Set(level)
handleOpt := &slog.HandlerOptions{
ReplaceAttr: l.renameAttr,
Level: l.leveler,
AddSource: l.opts.AddSource,
}
l.handler = slog.New(slog.NewJSONHandler(l.opts.Out, handleOpt)).With(attrs...).Handler()
return l
}
func (s *slogLogger) Init(opts ...logger.Option) error {
s.mu.Lock()
if len(s.opts.ContextAttrFuncs) == 0 {
s.opts.ContextAttrFuncs = logger.DefaultContextAttrFuncs
}
for _, o := range opts {
o(&s.opts)
}
s.leveler = new(slog.LevelVar)
handleOpt := &slog.HandlerOptions{
ReplaceAttr: s.renameAttr,
Level: s.leveler,
AddSource: s.opts.AddSource,
}
s.leveler.Set(loggerToSlogLevel(s.opts.Level))
s.handler = slog.New(slog.NewJSONHandler(s.opts.Out, handleOpt)).With(s.opts.Fields...).Handler()
s.mu.Unlock()
return nil
}
func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
s.printLog(ctx, lvl, msg, attrs...)
}
func (s *slogLogger) Info(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.InfoLevel, msg, attrs...)
}
func (s *slogLogger) Debug(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.DebugLevel, msg, attrs...)
}
func (s *slogLogger) Trace(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.TraceLevel, msg, attrs...)
}
func (s *slogLogger) Error(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.ErrorLevel, msg, attrs...)
}
func (s *slogLogger) Fatal(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.FatalLevel, msg, attrs...)
os.Exit(1)
}
func (s *slogLogger) Warn(ctx context.Context, msg string, attrs ...interface{}) {
s.printLog(ctx, logger.WarnLevel, msg, attrs...)
}
func (s *slogLogger) Name() string {
return s.opts.Name
}
func (s *slogLogger) String() string {
return "slog"
}
func (s *slogLogger) printLog(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
if !s.V(lvl) {
return
}
s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", lvl.String()).Inc()
attrs = prepareAttributes(attrs)
for _, fn := range s.opts.ContextAttrFuncs {
a := prepareAttributes(fn(ctx))
attrs = append(attrs, a...)
}
for _, attr := range attrs {
if ve, hasErr := attr.(error); hasErr && ve != nil {
attrs = append(attrs, slog.String(s.opts.ErrorKey, ve.Error()))
if span, ok := tracer.SpanFromContext(ctx); ok {
span.SetStatus(tracer.SpanStatusError, ve.Error())
}
break
}
}
if s.opts.AddStacktrace && lvl == logger.ErrorLevel {
stackInfo := make([]byte, 1024*1024)
if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
if len(traceLines) != 0 {
attrs = append(attrs, slog.String(s.opts.StacktraceKey, traceLines[len(traceLines)-1]))
}
}
}
var pcs [1]uintptr
runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, printLog, LogLvlMethod]
r := slog.NewRecord(s.opts.TimeFunc(), loggerToSlogLevel(lvl), msg, pcs[0])
r.Add(attrs...)
_ = s.handler.Handle(ctx, r)
}
func NewLogger(opts ...logger.Option) logger.Logger {
s := &slogLogger{
opts: logger.NewOptions(opts...),
}
s.opts.CallerSkipCount = defaultCallerSkipCount
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
}
}
func prepareAttributes(attrs []interface{}) []interface{} {
if len(attrs)%2 == 1 {
attrs = append(attrs, badKey)
attrs[len(attrs)-1], attrs[len(attrs)-2] = attrs[len(attrs)-2], attrs[len(attrs)-1]
}
return attrs
}