func Example() {
// everything logged needs a context
ctx := context.Background()
log.Info(ctx, "program started")
if err := doFirstThing(ctx, 5, 4); err != nil {
// ... error processing here ...
}
// YYYY-MM-DDTHH:MM:SS.FFFFFF info msg="program started"
// YYYY-MM-DDTHH:MM:SS.FFFFFF error msg="cannot do third thing" error="error message goes here" a=5 b=4
}
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"
}