A simple (but effective) implementation of a pull-stream Source and Sink that is compatible both with native browser WebSockets and ws created clients.

turn a websocket into a duplex pull stream. If provided, opts is passed to pws.sink(socket, opts).

Websockets do not support half open mode. see allowHalfOpen option in net module

If you have a protocol that assumes halfOpen connections, but are using a networking protocol like websockets that does not support it, I suggest using pull-goodbye with your protocol.

The duplex stream will also contain a copy of the properties from the http request that became the websocket. they are method, url, headers and upgrade.

Create a pull-stream Sink that will write data to the socket. opts may be {closeOnEnd: true, onClose: onClose}. onClose will be called when the sink ends. If closeOnEnd=false the stream will not close, it will just stop emitting data. (by default closeOnEnd is true)

If opts is a function, then onClose = opts; opts.closeOnEnd = true.

var pull = require('pull-stream');
var ws = require('pull-ws');

// connect to the echo endpoint for test/server.js
var socket = new WebSocket('wss://echo.websocket.org');

// write values to the socket
pull(
  pull.infinite(function() {
    return 'hello @ ' + Date.now()
  }),
  // throttle so it doesn't go nuts
  pull.asyncMap(function(value, cb) {
    setTimeout(function() {
      cb(null, value);
    }, 100);
  }),
  ws.sink(socket)
);

socket.addEventListener('message', function(evt) {
  console.log('received: ' + evt.data);
});

Create a pull-stream Source that will read data from the socket.

var pull = require('pull-stream');

// we just need the source, so cherrypick
var ws = require('pull-ws/source');

pull(
  // connect to the test/server.js endpoint
  ws(new WebSocket('ws://localhost:3000/read')),
  pull.log()
);

Copyright (c) 2014, Damon Oehlman [email protected]

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.