Open a Websocket connection from Meteor.js

Question

How can we open a Websockets connection from Meteor?

Can we do something like:

ws = new WebSocket('ws://localhost/path');
ws.on('open', function() {
    ws.send('something');
});
ws.on('message', function(message) {
    console.log('received: %s', message);
});

Error: ReferenceError: WebSocket is not defined

---

Using socket.io npm package

var io = Meteor.require('socket.io')
var socket = io.connect('http://localhost');

Error: TypeError: Object # has no method 'connect'

---

Using ws npm package

var WebSocket = Meteor.require('ws');
var ws = new WebSocket('ws://localhost');

Error: Error: Cannot find module '../build/default/bufferutil'

Answer 1

I created a new Meteor package joncursi:socket-io-client to solve this problem. Please see https://atmospherejs.com/joncursi/socket-io-client for more detail and example usage. Since I've bundled the NPM binaries into a package for you, you don't have to worry about installing NPM packages, declaring NPM.require() dependencies, etc. And best of all, you can deploy to .meteor.com without a hitch.

Answer 2

There is a package called Meteor Streams , that can let you do something similar, using the existing meteor websocket to connect to the local server:

chatStream = new Meteor.Stream('chat');

if(Meteor.isClient) {
  sendChat = function(message) {
    chatStream.emit('message', message);
    console.log('me: ' + message);
  };

  chatStream.on('message', function(message) {
    console.log('user: ' + message);
  });
}

I'm not sure you wanted to connect to another server or the local one, if its another one you can use the example you have provided. I would recommend using something else like SockJS or socket.io in the case where websockets aren't permitted on the client side (and hence websocket emulation is required).

Answer 3

According to this question's answer which refers to an openshift blog post, you answer is: (question : How to set Meteor WebSocket port for clients? )

I struggled with this for a while now and I tried different things. The solution that worked for me in OpenShift was this:

Set the DDP_DEFAULT_CONNECTION_URL variable

 //for http process.env.DDP_DEFAULT_CONNECTION_URL = 'http://' + process.env.OPENSHIFT_APP_DNS + ':8000' //for ssl process.env.DDP_DEFAULT_CONNECTION_URL = 'https://' + process.env.OPENSHIFT_APP_DNS + ':8443' 

According to this blog post: https://www.openshift.com/blogs/paas-websockets

Answer 4

您可以尝试这里是解决方案： https : //github.com/Akryum/meteor-socket-io