Function WebsocketCloseSprintf

coderd/httpapi/httpapi.go:278–290

WebsocketCloseSprintf formats a websocket close message and ensures it is truncated to the maximum allowed length.

(format string, vars ...any)

// WebsocketCloseSprintf formats a websocket close message and ensures it is
// truncated to the maximum allowed length.
func WebsocketCloseSprintf(format string, vars ...any) string {
	msg := fmt.Sprintf(format, vars...)

	// Cap msg length at 123 bytes. coder/websocket only allows close messages
	// of this length.
	if len(msg) > websocketCloseMaxLen {
		// Trim the string to 123 bytes. If we accidentally cut in the middle of
		// a UTF-8 character, remove it from the string.
		return strings.ToValidUTF8(msg[:websocketCloseMaxLen], "")
	}

	return msg
}

type EventSender func(rw http.ResponseWriter, r *http.Request) (
	sendEvent func(sse codersdk.ServerSentEvent) error,