Function httpHandlerFunc

engine/server/session.go:2278–2306

httpHandlerFunc lets you write an http handler that just returns an error, which will be turned into a 500 http response if non-nil, or a specific code if the error is of type httpError. It also accepts a generic extra argument that will be passed to the handler function to support providing any ext

(fn func(http.ResponseWriter, *http.Request, T) error, t T)

// It also accepts a generic extra argument that will be passed to the handler function to support
// providing any extra already initialized state.
func httpHandlerFunc[T any](fn func(http.ResponseWriter, *http.Request, T) error, t T) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		err := fn(w, r, t)
		if err == nil {
			return
		}

		bklog.G(r.Context()).
			WithField("method", r.Method).
			WithField("path", r.URL.Path).
			WithError(err).Error("failed to serve request")

		// check whether this is a hijacked connection, if so we can't write any http errors to it
		if _, testErr := w.Write(nil); testErr == http.ErrHijacked {
			return
		}

		var httpErr httpError
		var gqlErr gqlError
		switch {
		case errors.As(err, &httpErr):
			httpErr.WriteTo(w)
		case errors.As(err, &gqlErr):
			gqlErr.WriteTo(w)
		default:
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	}
}