Answer ping in websocket; Prevent multiple registrations

Author: simonwep

src/websocket.js

@@ -10,6 +10,11 @@ module.exports = server => {
 
  ws.on('message', async message => {
 
+ // Answer ping request
+ if (message === '__ping__') {
+ return ws.send('__pong__');
+ }
+
  // Try to parse message
  try {
  message = JSON.parse(message);
@@ -30,6 +35,8 @@ module.exports = server => {
  const userid = user.id;
  if (!(userid in userMap)) {
  userMap[userid] = [];
+ } else if (userMap[userid].includes(ws)) {
+ return;
  }
 
  userMap[userid].push(ws);