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slog.go
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slog.go
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package logger
import (
"context"
"fmt"
"io"
"log/slog"
"path/filepath"
"runtime"
"time"
)
// logger.NewLogger(os.Stdout, logger.WithJSON(true))
// slog.Info("init", "logger", "log/slog", "format", "json")
func NewLogger(w io.Writer, options ...Option) *slog.Logger {
opts := LoggerOptions(options...)
var level slog.Level
switch opts.level {
case LevelDebug:
level = slog.LevelDebug
case LevelInfo:
level = slog.LevelInfo
case LevelWarn:
level = slog.LevelWarn
case LevelError:
level = slog.LevelInfo
default:
level = slog.LevelInfo
}
hOpts := &slog.HandlerOptions{
AddSource: false,
Level: level,
ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
if a.Key == slog.SourceKey {
if s, ok := a.Value.Any().(*slog.Source); ok {
if s != nil {
return slog.String("caller", fmt.Sprintf("%s/%s:%d", filepath.Base(filepath.Dir(s.File)), filepath.Base(s.File), s.Line))
}
}
}
if a.Key == slog.TimeKey {
return slog.String("time", time.Now().Format(opts.timeFormat))
}
if a.Key == slog.MessageKey {
if len(a.Value.String()) == 0 {
return slog.Attr{}
}
}
return a
},
}
var h interface{}
if opts.json {
h = slog.NewJSONHandler(w, hOpts)
} else {
h = slog.NewTextHandler(w, hOpts)
}
keys := []any{
sourceKey{},
}
var l *slog.Logger
if opts.json {
enc := h.(*slog.JSONHandler)
h := ContextHandler{enc, keys}
l = slog.New(h)
} else {
enc := h.(*slog.TextHandler)
h := ContextHandler{enc, keys}
l = slog.New(h)
}
slog.SetDefault(l)
return l
}
type ContextHandler struct {
slog.Handler
keys []any
}
func (h ContextHandler) Handle(ctx context.Context, r slog.Record) error {
if ctx.Value(sourceKey{}) == nil {
r.Add(slog.SourceKey, CallerSource(4))
}
r.AddAttrs(h.observe(ctx)...)
return h.Handler.Handle(ctx, r)
}
func (h ContextHandler) observe(ctx context.Context) (as []slog.Attr) {
for _, k := range h.keys {
a, ok := ctx.Value(k).(slog.Attr)
if !ok {
continue
}
a.Value = a.Value.Resolve()
as = append(as, a)
}
return
}
func SourceContext(ctx context.Context, s *slog.Source) context.Context {
return context.WithValue(ctx, sourceKey{}, slog.Any(slog.SourceKey, s))
}
func CallerSource(skip int) *slog.Source {
_, file, line, _ := runtime.Caller(skip)
return &slog.Source{File: file, Line: line}
}
type sourceKey struct{}