redstone_web_socket 0.1.0

Redstone WebSocket #

Build Status

redstone_web_socket is a web socket plugin for Redstone.dart. It uses the shelf_web_socket package to create web socket handlers.

Using @WebSocketHandler with functions #

If a function is annotated with @WebSocketHandler, it'll be invoked with a WebSocketChannel object for every new established connection:

onConnection(WebSocketChannel channel) { {
    channel.sink.add("echo $message");

Using @WebSocketHandler with classes #

If a class is annotated with @WebSocketHandler, the plugin will install a event listener for every method annotated with @OnOpen, @OnMessage, @OnError and @OnClose:

class ServerEndPoint {

  void onOpen(WebSocketSession session) {
    print("connection established");

  void onMessage(String message, WebSocketSession session) {
    print("message received: $message");
    session.connection.add("echo $message");

  void onError(error, WebSocketSession session) {
    print("error: $error");

  void onClose(WebSocketSession session) {
    print("connection closed");


Like redstone groups, the class will be instantiated only once, and it can request injectable objects with a constructor (see dependency injection).

Installing handlers #

To install web socket handlers, you just have to import redstone_web_socket.dart and call getWebSocketPlugin():

import 'package:redstone/server.dart' as app;
import 'package:redstone_web_socket/redstone_web_socket.dart';

void main() {

  //install web socket handlers


Unit Tests #

This package also provides a simple mock client, which can be used in unit tests:

import 'package:redstone/server.dart' as app;
import 'package:redstone_web_socket/redstone_web_socket.dart';
import 'package:unittest/unittest.dart';

main() {

  test("Test echo service", () {

    var completer = new Completer();
    var socket = new MockWebSocket();

    socket.listen((message) {

      expect(message, equals("echo message"));


    openMockConnection("/ws", socket);


    return completer.future;



Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  redstone_web_socket: ^0.1.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:redstone_web_socket/redstone_web_socket.dart';
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The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.13.0 <2.0.0