| 1 | package scribe |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "log/slog" |
| 7 | ) |
| 8 | |
| 9 | // MultiHandler fans out log records to multiple handlers. |
| 10 | type MultiHandler struct { |
| 11 | handlers []slog.Handler |
| 12 | } |
| 13 | |
| 14 | // NewMultiHandler creates a handler that writes to all given handlers. |
| 15 | func NewMultiHandler(handlers ...slog.Handler) *MultiHandler { |
| 16 | return &MultiHandler{handlers: handlers} |
| 17 | } |
| 18 | |
| 19 | // Enabled implements slog.Handler. |
| 20 | // Returns true if any inner handler is enabled for the level. |
| 21 | func (h *MultiHandler) Enabled(ctx context.Context, level slog.Level) bool { |
| 22 | for _, handler := range h.handlers { |
| 23 | if handler.Enabled(ctx, level) { |
| 24 | return true |
| 25 | } |
| 26 | } |
| 27 | return false |
| 28 | } |
| 29 | |
| 30 | // Handle implements slog.Handler. |
| 31 | // Writes to all enabled handlers, collecting any errors. |
| 32 | func (h *MultiHandler) Handle(ctx context.Context, r slog.Record) error { |
| 33 | var errs []error |
| 34 | for _, handler := range h.handlers { |
| 35 | if handler.Enabled(ctx, r.Level) { |
| 36 | if err := handler.Handle(ctx, r); err != nil { |
| 37 | errs = append(errs, err) |
| 38 | } |
| 39 | } |
| 40 | } |
| 41 | return errors.Join(errs...) |
| 42 | } |
| 43 | |
| 44 | // WithAttrs implements slog.Handler. |
| 45 | func (h *MultiHandler) WithAttrs(attrs []slog.Attr) slog.Handler { |
| 46 | handlers := make([]slog.Handler, len(h.handlers)) |
| 47 | for i, handler := range h.handlers { |
| 48 | handlers[i] = handler.WithAttrs(attrs) |
| 49 | } |
| 50 | return &MultiHandler{handlers: handlers} |
| 51 | } |
| 52 | |
| 53 | // WithGroup implements slog.Handler. |
| 54 | func (h *MultiHandler) WithGroup(name string) slog.Handler { |
| 55 | if name == "" { |
| 56 | return h |
| 57 | } |
| 58 | handlers := make([]slog.Handler, len(h.handlers)) |
| 59 | for i, handler := range h.handlers { |
| 60 | handlers[i] = handler.WithGroup(name) |
| 61 | } |
| 62 | return &MultiHandler{handlers: handlers} |
| 63 | } |
| 64 | |