Created
August 26, 2024 19:47
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Go slog, example with context handler
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| package main | |
| import ( | |
| "context" | |
| "log/slog" | |
| "os" | |
| ) | |
| type contextKey string | |
| const transactionIDKey = contextKey("transactionID") | |
| func contextWithTransactionID(ctx context.Context, transactionID string) context.Context { | |
| return context.WithValue(ctx, transactionIDKey, transactionID) | |
| } | |
| type ContextHandler struct { | |
| slog.Handler | |
| } | |
| func (h *ContextHandler) Handle(ctx context.Context, r slog.Record) error { | |
| if transactionID, ok := ctx.Value(transactionIDKey).(string); ok { | |
| r.AddAttrs(slog.String("tx_id", transactionID)) | |
| } | |
| return h.Handler.Handle(ctx, r) | |
| } | |
| func deepProcess(ctx context.Context) { | |
| slog.DebugContext(ctx, "inside the deep process") | |
| } | |
| func main() { | |
| var logLevel = new(slog.LevelVar) | |
| logger := slog.New(&ContextHandler{slog.NewTextHandler( | |
| os.Stdout, &slog.HandlerOptions{Level: logLevel})}) | |
| slog.SetDefault(logger) | |
| slog.Debug("Debug 00 ignored") | |
| slog.Info("Info 00") | |
| logLevel.Set(slog.LevelDebug) | |
| slog.Debug("Debug 01") | |
| slog.Info("Info 01") | |
| ctx := context.Background() | |
| slog.DebugContext(ctx, "debug 02") | |
| // get or create transaction ID or event ID, and add it to the context | |
| ctx = contextWithTransactionID(ctx, "tx_or_event_or_alert_id_12345") | |
| slog.DebugContext(ctx, "debug 03") | |
| deepProcess(ctx) | |
| } |
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