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 ExampleWithValue(ctx context.Context, n1, n2 int) error {
if err := doSomethingWith(n1, n2); err != nil {
return slog.Error(ctx, "doSomethingWith failed",
slog.WithValue("n1", n1),
slog.WithValue("n2", n2))
}
// ... 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"
}