Handling "connection error"

[hems]

Currently when the webserver is down for maintenance i get the following error on my Browser console.

socket.js:64 WebSocket connection to 'ws://[...]/websocket' failed: Error during WebSocket handshake: Unexpected response code: 503

Is that a way of gracefully handling connection errors so they don't end up in the Browser Console and the application can deal with them programmatically, for instance showing an UI element.

[Gregivy]

Try to use try {await server.connect()} catch(error) {/*error logic here*/}

[hems]

Still hangs forever on node.js 12.

It never throws.. You can reproduce this way:

import ws from 'isomorphic-ws'
import simpleDDP from 'simpleddp'

const opts = {
  endpoint: 'wss://google.com',
  SocketConstructor: ws,
  reconnectInterval: 500,
};

DDP = new simpleDDP(opts, [simpleDDPLogin]);

;(async () =>{
  try {
    console.log("will hang")
    await DDP.connect()
    console.log("this never gets logged!")
  } catch(error) {
    console.log("this never happens too", error)
  }

  console.log("executed 2")
})()

On the Chrome browser, I get a console.error that comes from socket.js to the console but it doesn't throw / get caught as well:

Does it catch for you?

[hems]

If i set a "maxTimeout" then i get a Error as you can see on the [your source code here](maxTimeout: 1000) but that error has no message, but i can see the socket.js stays retrying anyway, maybe "socket.close" should also be called when the max timeout is reached?

Does the same happen to you?

[Gregivy]

The error happens earlier because by default simpleDDP will try to connect to the endpoint and you are not putting new simpleDDP(opts, [simpleDDPLogin]) in a try block, but you can prevent the default with autoConnect: false:

const opts = {
  endpoint: 'wss://google.com',
  SocketConstructor: ws,
  reconnectInterval: 500,
  autoConnect: false
};

Have a look here about all the constructor parameters https://gregivy.github.io/simpleddp/simpleDDP.html, there is also autoReconnect.

[Gregivy]

Concerning the maxTimeout it is only for method calls.

[Gregivy]

Also don't forget that you have these events:

server.on('connected', () => {
    // do something
});

server.on('disconnected', () => {
    // for example show alert to user
});

server.on('error', (e) => {
    // global errors from server
});