Don't throw runtime exception if WebSocket is already closed

Summary: Refer #3364
Closes https://github.com/facebook/react-native/pull/3706

Reviewed By: svcscm

Differential Revision: D2585455

Pulled By: mkonicek

fb-gh-sync-id: fecd5e46c59a79a109aad97a49c9ea016e82d669

Libraries/WebSocket/WebSocket.js

@@ -104,7 +104,7 @@ class WebSocket extends WebSocketBase {
         this.onclose && this.onclose(event);
         this.dispatchEvent(event);
         this._unregisterEvents();
-        this._closeWebSocket(id);
+        this.close();
       }),
       RCTDeviceEventEmitter.addListener('websocketFailed', ev => {
         if (ev.id !== id) {
@@ -115,7 +115,7 @@ class WebSocket extends WebSocketBase {
         this.onerror && this.onerror(event);
         this.dispatchEvent(event);
         this._unregisterEvents();
-        this.readyState === this.OPEN && this._closeWebSocket(id);
+        this.close();
       })
     ];
   }

Libraries/WebSocket/WebSocketBase.js

@@ -44,6 +44,7 @@ class WebSocketBase extends EventTarget {
       protocols = [];
     }
 
+    this.readyState = WebSocketBase.CONNECTING;
     this.connectToSocketImpl(url);
   }
 
@@ -57,6 +58,7 @@ class WebSocketBase extends EventTarget {
       this.cancelConnectionImpl();
     }
 
+    this.readyState = WebSocketBase.CLOSING;
     this.closeConnectionImpl();
   }
 

ReactAndroid/src/main/java/com/facebook/react/modules/websocket/WebSocketModule.java

@@ -131,8 +131,13 @@ public class WebSocketModule extends ReactContextBaseJavaModule {
   public void close(int code, String reason, int id) {
     WebSocket client = mWebSocketConnections.get(id);
     if (client == null) {
-      // This is a programmer error
-      throw new RuntimeException("Cannot close WebSocket. Unknown WebSocket id " + id);
+      // WebSocket is already closed
+      // Don't do anything, mirror the behaviour on web
+      FLog.w(
+        ReactConstants.TAG,
+        "Cannot close WebSocket. Unknown WebSocket id " + id);
+
+      return;
     }
     try {
       client.close(code, reason);