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slog.go
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slog.go
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package logging
import (
"context"
"errors"
"log/slog"
"os"
"runtime"
"time"
)
// SlogLogger is a Logger implementation that uses slog.
type SlogLogger struct {
logger *slog.Logger
}
var _ Logger = (*SlogLogger)(nil)
func NewSlogLogger(handler string, addSource bool, level slog.Leveler) (*SlogLogger, error) {
options := &slog.HandlerOptions{
AddSource: addSource,
Level: level,
}
if handler == "text" {
slog.SetDefault(slog.New(&wrappedSlogHandler{
innerHandler: slog.NewTextHandler(os.Stderr, options),
extractAttrs: []func(context.Context) []slog.Attr{extractTracingAttrs},
}))
} else if handler == "json" {
slog.SetDefault(slog.New(&wrappedSlogHandler{
innerHandler: slog.NewJSONHandler(os.Stderr, options),
extractAttrs: []func(context.Context) []slog.Attr{extractTracingAttrs},
}))
} else {
return nil, errors.New("unknown logging handler")
}
return &SlogLogger{logger: slog.Default()}, nil
}
func (l *SlogLogger) With(args ...any) Logger {
return &SlogLogger{logger: l.logger.With(args...)}
}
func (l *SlogLogger) log(ctx context.Context, level Level, message string, args ...any) {
if !l.logger.Enabled(ctx, slog.Level(level)) {
return
}
var pc uintptr
var pcs [1]uintptr
runtime.Callers(3, pcs[:])
pc = pcs[0]
r := slog.NewRecord(time.Now(), slog.Level(level), message, pc)
r.Add(args...)
if ctx == nil {
ctx = context.Background()
}
_ = l.logger.Handler().Handle(ctx, r)
}
func (l *SlogLogger) Log(ctx context.Context, level Level, message string, args ...any) {
l.log(ctx, level, message, args...)
}
func (l *SlogLogger) Debug(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelDebug, message, args...)
}
func (l *SlogLogger) Info(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelInfo, message, args...)
}
func (l *SlogLogger) Warn(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelWarn, message, args...)
}
func (l *SlogLogger) Error(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelError, message, args...)
}
func (l *SlogLogger) Panic(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelPanic, message, args...)
panic(message)
}
func (l *SlogLogger) Fatal(ctx context.Context, message string, args ...any) {
l.log(ctx, LevelFatal, message, args...)
os.Exit(1)
}
type wrappedSlogHandler struct {
innerHandler slog.Handler
extractAttrs []func(context.Context) []slog.Attr
}
var _ slog.Handler = (*wrappedSlogHandler)(nil)
func (h *wrappedSlogHandler) Enabled(ctx context.Context, level slog.Level) bool {
return h.innerHandler.Enabled(ctx, level)
}
func (h *wrappedSlogHandler) Handle(ctx context.Context, record slog.Record) error {
for _, extract := range h.extractAttrs {
if attrs := extract(ctx); attrs != nil {
record.AddAttrs(attrs...)
}
}
return h.innerHandler.Handle(ctx, record)
}
func (h *wrappedSlogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
return &wrappedSlogHandler{innerHandler: h.innerHandler.WithAttrs(attrs)}
}
func (h *wrappedSlogHandler) WithGroup(name string) slog.Handler {
return &wrappedSlogHandler{innerHandler: h.innerHandler.WithGroup(name)}
}