Function From

src/pkg/logger/logger.go:216–235

From takes a context and reads out a *slog.Logger. If From does not find a value it will return a discarding logger similar to log-format "none".

(ctx context.Context)

// From takes a context and reads out a *slog.Logger. If From does not find a value it will return a discarding logger
// similar to log-format "none".
func From(ctx context.Context) *slog.Logger {
	// Check that we have a ctx
	if ctx == nil {
		return newDiscard()
	}
	// Grab value from key
	log := ctx.Value(defaultCtxKey)
	if log == nil {
		return newDiscard()
	}

	// Ensure our value is a *slog.Logger before we cast.
	switch l := log.(type) {
	case *slog.Logger:
		return l
	default:
		// Not reached
		panic(fmt.Sprintf("unexpected value type on context key: %T", log))
	}
}

// newDiscard returns a logger without any settings that goes to io.Discard
func newDiscard() *slog.Logger {