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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| package logging | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "log/slog" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
| ) | ||
|
|
||
| const ( | ||
| timeFormat = "[15:04:05.000]" | ||
|
|
||
| reset = "\033[0m" | ||
|
|
||
| black = 30 | ||
| red = 31 | ||
| green = 32 | ||
| yellow = 33 | ||
| blue = 34 | ||
| magenta = 35 | ||
| cyan = 36 | ||
| lightGray = 37 | ||
| darkGray = 90 | ||
| lightRed = 91 | ||
| lightGreen = 92 | ||
| lightYellow = 93 | ||
| lightBlue = 94 | ||
| lightMagenta = 95 | ||
| lightCyan = 96 | ||
| white = 97 | ||
| ) | ||
|
|
||
| func colorize(colorCode int, v string) string { | ||
| return fmt.Sprintf("\033[%sm%s%s", strconv.Itoa(colorCode), v, reset) | ||
| } | ||
|
|
||
| type Handler struct { | ||
| h slog.Handler | ||
| r func([]string, slog.Attr) slog.Attr | ||
| b *bytes.Buffer | ||
| m *sync.Mutex | ||
| } | ||
|
|
||
| func (h *Handler) Enabled(ctx context.Context, level slog.Level) bool { | ||
| return h.h.Enabled(ctx, level) | ||
| } | ||
|
|
||
| func (h *Handler) WithAttrs(attrs []slog.Attr) slog.Handler { | ||
| return &Handler{h: h.h.WithAttrs(attrs), b: h.b, r: h.r, m: h.m} | ||
| } | ||
|
|
||
| func (h *Handler) WithGroup(name string) slog.Handler { | ||
| return &Handler{h: h.h.WithGroup(name), b: h.b, r: h.r, m: h.m} | ||
| } | ||
|
|
||
| func (h *Handler) computeAttrs( | ||
| ctx context.Context, | ||
| r slog.Record, | ||
| ) (map[string]any, error) { | ||
| h.m.Lock() | ||
| defer func() { | ||
| h.b.Reset() | ||
| h.m.Unlock() | ||
| }() | ||
| if err := h.h.Handle(ctx, r); err != nil { | ||
| return nil, fmt.Errorf("error when calling inner handler's Handle: %w", err) | ||
| } | ||
|
|
||
| var attrs map[string]any | ||
| err := json.Unmarshal(h.b.Bytes(), &attrs) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error when unmarshaling inner handler's Handle result: %w", err) | ||
| } | ||
| return attrs, nil | ||
| } | ||
|
|
||
| func (h *Handler) Handle(ctx context.Context, r slog.Record) error { | ||
|
|
||
| var level string | ||
| levelAttr := slog.Attr{ | ||
| Key: slog.LevelKey, | ||
| Value: slog.AnyValue(r.Level), | ||
| } | ||
| if h.r != nil { | ||
| levelAttr = h.r([]string{}, levelAttr) | ||
| } | ||
|
|
||
| if !levelAttr.Equal(slog.Attr{}) { | ||
| level = levelAttr.Value.String() + ":" | ||
|
|
||
| if r.Level <= slog.LevelDebug { | ||
| level = colorize(lightGray, level) | ||
| } else if r.Level <= slog.LevelInfo { | ||
| level = colorize(cyan, level) | ||
| } else if r.Level < slog.LevelWarn { | ||
| level = colorize(lightBlue, level) | ||
| } else if r.Level < slog.LevelError { | ||
| level = colorize(lightYellow, level) | ||
| } else if r.Level <= slog.LevelError+1 { | ||
| level = colorize(lightRed, level) | ||
| } else if r.Level > slog.LevelError+1 { | ||
| level = colorize(lightMagenta, level) | ||
| } | ||
| } | ||
|
|
||
| var timestamp string | ||
| timeAttr := slog.Attr{ | ||
| Key: slog.TimeKey, | ||
| Value: slog.StringValue(r.Time.Format(timeFormat)), | ||
| } | ||
| if h.r != nil { | ||
| timeAttr = h.r([]string{}, timeAttr) | ||
| } | ||
| if !timeAttr.Equal(slog.Attr{}) { | ||
| timestamp = colorize(lightGray, timeAttr.Value.String()) | ||
| } | ||
|
|
||
| var msg string | ||
| msgAttr := slog.Attr{ | ||
| Key: slog.MessageKey, | ||
| Value: slog.StringValue(r.Message), | ||
| } | ||
| if h.r != nil { | ||
| msgAttr = h.r([]string{}, msgAttr) | ||
| } | ||
| if !msgAttr.Equal(slog.Attr{}) { | ||
| msg = colorize(white, msgAttr.Value.String()) | ||
| } | ||
|
|
||
| attrs, err := h.computeAttrs(ctx, r) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| bytes, err := json.MarshalIndent(attrs, "", " ") | ||
| if err != nil { | ||
| return fmt.Errorf("error when marshaling attrs: %w", err) | ||
| } | ||
|
|
||
| out := strings.Builder{} | ||
| if len(timestamp) > 0 { | ||
| out.WriteString(timestamp) | ||
| out.WriteString(" ") | ||
| } | ||
| if len(level) > 0 { | ||
| out.WriteString(level) | ||
| out.WriteString(" ") | ||
| } | ||
| if len(msg) > 0 { | ||
| out.WriteString(msg) | ||
| out.WriteString(" ") | ||
| } | ||
| if len(bytes) > 0 { | ||
| out.WriteString(colorize(darkGray, string(bytes))) | ||
| } | ||
| fmt.Println(out.String()) | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func suppressDefaults( | ||
| next func([]string, slog.Attr) slog.Attr, | ||
| ) func([]string, slog.Attr) slog.Attr { | ||
| return func(groups []string, a slog.Attr) slog.Attr { | ||
| if a.Key == slog.TimeKey || | ||
| a.Key == slog.LevelKey || | ||
| a.Key == slog.MessageKey { | ||
| return slog.Attr{} | ||
| } | ||
| if next == nil { | ||
| return a | ||
| } | ||
| return next(groups, a) | ||
| } | ||
| } | ||
|
|
||
| func NewPrettyHandler(opts *slog.HandlerOptions) *Handler { | ||
| if opts == nil { | ||
| opts = &slog.HandlerOptions{} | ||
| } | ||
| b := &bytes.Buffer{} | ||
| return &Handler{ | ||
| b: b, | ||
| h: slog.NewJSONHandler(b, &slog.HandlerOptions{ | ||
| Level: opts.Level, | ||
| AddSource: opts.AddSource, | ||
| ReplaceAttr: suppressDefaults(opts.ReplaceAttr), | ||
| }), | ||
| r: opts.ReplaceAttr, | ||
| m: &sync.Mutex{}, | ||
| } | ||
| } |
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