func doSecondThing(ctx context.Context) error { if err := doThirdThing(); err != nil { // log the message at the first point where the context is available return log.Error(ctx, "cannot do third thing", log.WithError(err)) } return nil }
func ExampleWithError(ctx context.Context) error { if err := doSomething(); err != nil { return slog.Error(ctx, "doSomething failed", slog.WithError(err)) } // ... more processing and then ... return nil }
func ExampleOption(ctx context.Context, n1, n2 int) error { if err := doSomethingWith(n1, n2); err != nil { return slog.Error(ctx, "cannot doSomething", slog.WithValue("n1", n1), slog.WithValue("n2", n2), slog.WithError(err)) } // .. more processing and then ... return nil }
func ExampleNewContext(ctx context.Context, n1, n2 int) error { ctx = slog.NewContext(ctx, slog.Property{Key: "n1", Value: n1}, slog.Property{Key: "n2", Value: n2}) if err := doSomethingWith(n1, n2); err != nil { return slog.Error(ctx, "doSomethingWith failed", slog.WithError(err)) } slog.Debug(ctx, "did something with") // ... more processing and then ... return nil }
func ExampleNewWriter(ctx context.Context) { // Creates a HTTP server whose error log will write to the // default slog.Logger. Any panics that are recovered will // have the details logged via slog. httpServer := &http.Server{ Addr: ":8080", ErrorLog: log.New(slog.NewWriter(ctx), "http", 0), } slog.Info(ctx, "web server started", slog.WithValue("addr", httpServer.Addr)) if err := httpServer.ListenAndServe(); err != nil { slog.Error(ctx, "web server failed", slog.WithError(err)) } // 2009-11-10T12:34:56.789 info msg="web server started" addr=:8080 // 2009-11-10T12:35:57:987 error msg="http: panic serving 123.1:2.3:36145 runtime error: invalid memory address or nil pointer dereference" }