Merge branch 'feature/websocket' of https://bitbucket.org/equilibriumito/gabinete-digital into feature/websocket

src/app/services/chat/websocket.service.ts

@@ -0,0 +1,43 @@
+import { Injectable } from '@angular/core';
+import * as Rx from 'rxjs/Rx';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class WebsocketService {
+
+  constructor() { }
+
+  private subject: Rx.Subject<MessageEvent>;
+
+  public connect(url): Rx.Subject<MessageEvent> {
+    if(!this.subject){
+      this.subject = this.create(url);
+      console.log("Sucessful connect :"+url);
+    }
+    return this.subject;
+  }
+
+  private create(url): Rx.Subject<MessageEvent>{
+    let ws = new WebSocket(url);
+
+    let observable = Rx.Observable.create(
+      (obs: Rx.Observer<MessageEvent>) => {
+        ws.onmessage = obs.next.bind(obs);
+        ws.onerror = obs.error.bind(obs);
+        ws.onclose = obs.complete.bind(obs);
+        return ws.close.bind(ws)
+      })
+
+      let observer = {
+        next: (data: Object) => {
+          if(ws.readyState === WebSocket.OPEN){
+            ws.send(JSON.stringify(data));
+          }
+        }
+      }
+
+    return Rx.Subject.create(observer, observable);
+
+  }
+}