angel_websocket 1.0.0

WebSocket plugin for Angel

angel_websocket

WebSocket plugin for Angel.

This plugin broadcasts events from hooked services via WebSockets.

In addition, it adds itself to the app's IoC container as AngelWebSocket, so that it can be used in controllers as well.

WebSocket contexts are add to req.properties as 'socket'.

Usage

Server-side

import "package:angel_framework/angel_framework.dart";
import "package:angel_websocket/server.dart";

main() async {
  var app = new Angel();
  await app.configure(new AngelWebSocket("/ws"));
}

Filtering events is easy with services. Just return a bool, whether synchronously or asynchronously.

myService.properties['ws:filter'] = (WebSocketContext socket) async {
  return true;
}

Adding Handlers within a Controller

WebSocketController extends a normal Controller, but also listens to WebSockets.

import 'dart:async';
import "package:angel_framework/angel_framework.dart";
import "package:angel_websocket/server.dart";

@Expose("/")
class MyController extends WebSocketController {
  @override
  void onConnect(WebSocketContext socket) {
    // On connect...
  }
  
  // Dependency injection works, too..
  @ExposeWs("read_message")
  void sendMessage(WebSocketContext socket, Db db) async {
    socket.send("found_message", db.collection("messages").findOne(where.id("...")));
  }

  // Event filtering
  @ExposeWs("foo")
  void foo() {
    broadcast(new WebSocketEvent(...), filter: (socket) async => ...);
  }
}

In the Browser

import "package:angel_websocket/browser.dart";

main() async {
  Angel app = new WebSockets("/ws");
  await app.connect();

  var Cars = app.service("api/cars");

  Cars.onCreated.listen((e) => print("New car: ${e.data}"));

  // Happens asynchronously
  Cars.create({"brand": "Toyota"});

  // Listen for arbitrary events
  app.on['custom_event'].listen((event) {
    // For example, this might be sent by a
    // WebSocketController.
    print('Hi!');
  });
}

CLI Client

import "package:angel_framework/angel_framework" as srv;
import "package:angel_websocket/io.dart";

// You can include these in a shared file and access on both client and server
class Car extends srv.Model {
  int year;
  String brand, make;

  Car({this.year, this.brand, this.make});

  @override String toString() => "$year $brand $make";
}

main() async {
  Angel app = new WebSockets("/ws");

  // Wait for WebSocket connection...
  await app.connect();

  var Cars = app.service("api/cars", type: Car);

  Cars.onCreated.listen((e) {
      // Automatically deserialized into a car :)
      Car car = e.data;

      // I just bought a new 2016 Toyota Camry!
      print("I just bought a new $car!");
  });

  // Happens asynchronously
  Cars.create({"year": 2016, "brand": "Toyota", "make": "Camry"});
}