File size: 3,415 Bytes
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import (
"context"
"log/slog"
"strings"
"time"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type slogZapHandler struct {
logger *zap.Logger
attrs []slog.Attr
groups []string
}
func newSlogZapHandler(logger *zap.Logger) slog.Handler {
if logger == nil {
logger = zap.NewNop()
}
return &slogZapHandler{
logger: logger,
attrs: make([]slog.Attr, 0, 8),
groups: make([]string, 0, 4),
}
}
func (h *slogZapHandler) Enabled(_ context.Context, level slog.Level) bool {
switch {
case level >= slog.LevelError:
return h.logger.Core().Enabled(LevelError)
case level >= slog.LevelWarn:
return h.logger.Core().Enabled(LevelWarn)
case level <= slog.LevelDebug:
return h.logger.Core().Enabled(LevelDebug)
default:
return h.logger.Core().Enabled(LevelInfo)
}
}
func (h *slogZapHandler) Handle(_ context.Context, record slog.Record) error {
fields := make([]zap.Field, 0, len(h.attrs)+record.NumAttrs()+3)
fields = append(fields, slogAttrsToZapFields(h.groups, h.attrs)...)
record.Attrs(func(attr slog.Attr) bool {
fields = append(fields, slogAttrToZapField(h.groups, attr))
return true
})
switch {
case record.Level >= slog.LevelError:
h.logger.Error(record.Message, fields...)
case record.Level >= slog.LevelWarn:
h.logger.Warn(record.Message, fields...)
case record.Level <= slog.LevelDebug:
h.logger.Debug(record.Message, fields...)
default:
h.logger.Info(record.Message, fields...)
}
return nil
}
func (h *slogZapHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
next := *h
next.attrs = append(append([]slog.Attr{}, h.attrs...), attrs...)
return &next
}
func (h *slogZapHandler) WithGroup(name string) slog.Handler {
name = strings.TrimSpace(name)
if name == "" {
return h
}
next := *h
next.groups = append(append([]string{}, h.groups...), name)
return &next
}
func slogAttrsToZapFields(groups []string, attrs []slog.Attr) []zap.Field {
fields := make([]zap.Field, 0, len(attrs))
for _, attr := range attrs {
fields = append(fields, slogAttrToZapField(groups, attr))
}
return fields
}
func slogAttrToZapField(groups []string, attr slog.Attr) zap.Field {
if len(groups) > 0 {
attr.Key = strings.Join(append(append([]string{}, groups...), attr.Key), ".")
}
value := attr.Value.Resolve()
switch value.Kind() {
case slog.KindBool:
return zap.Bool(attr.Key, value.Bool())
case slog.KindInt64:
return zap.Int64(attr.Key, value.Int64())
case slog.KindUint64:
return zap.Uint64(attr.Key, value.Uint64())
case slog.KindFloat64:
return zap.Float64(attr.Key, value.Float64())
case slog.KindDuration:
return zap.Duration(attr.Key, value.Duration())
case slog.KindTime:
return zap.Time(attr.Key, value.Time())
case slog.KindString:
return zap.String(attr.Key, value.String())
case slog.KindGroup:
groupFields := make([]zap.Field, 0, len(value.Group()))
for _, nested := range value.Group() {
groupFields = append(groupFields, slogAttrToZapField(nil, nested))
}
return zap.Object(attr.Key, zapObjectFields(groupFields))
case slog.KindAny:
if t, ok := value.Any().(time.Time); ok {
return zap.Time(attr.Key, t)
}
return zap.Any(attr.Key, value.Any())
default:
return zap.String(attr.Key, value.String())
}
}
type zapObjectFields []zap.Field
func (z zapObjectFields) MarshalLogObject(enc zapcore.ObjectEncoder) error {
for _, field := range z {
field.AddTo(enc)
}
return nil
}
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