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| [](http://travis-ci.org/einaros/ws) | ||
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| # ws: a node.js websocket library # | ||
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| `ws` is a simple to use websocket implementation, up-to-date against RFC-6455, and [probably the fastest WebSocket library for node.js](http://hobbycoding.posterous.com/the-fastest-websocket-module-for-nodejs). | ||
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| Passes the quite extensible Autobahn test suite. See http://einaros.github.com/ws for the full reports. | ||
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| Comes with a command line utility, `wscat`, which can either act as a server (--listen), or client (--connect); Use it to debug simple websocket services. | ||
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| ## Protocol support ## | ||
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| * **Hixie draft 76** (Old and deprecated, but still in use by Safari and Opera. Added to ws version 0.4.2, but server only. Can be disabled by setting the `disableHixie` option to true.) | ||
| * **HyBi drafts 07-12** (Use the option `protocolVersion: 8`, or argument `-p 8` for wscat) | ||
| * **HyBi drafts 13-17** (Current default, alternatively option `protocolVersion: 13`, or argument `-p 13` for wscat) | ||
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| _See the echo.websocket.org example below for how to use the `protocolVersion` option._ | ||
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| ## Usage ## | ||
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| ### Installing ### | ||
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| `npm install ws` | ||
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| ### Sending and receiving text data ### | ||
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| ```js | ||
| var WebSocket = require('ws'); | ||
| var ws = new WebSocket('ws://www.host.com/path'); | ||
| ws.on('open', function() { | ||
| ws.send('something'); | ||
| }); | ||
| ws.on('message', function(data, flags) { | ||
| // flags.binary will be set if a binary data is received | ||
| // flags.masked will be set if the data was masked | ||
| }); | ||
| ``` | ||
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| ### Sending binary data ### | ||
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| ```js | ||
| var WebSocket = require('ws'); | ||
| var ws = new WebSocket('ws://www.host.com/path'); | ||
| ws.on('open', function() { | ||
| var array = new Float32Array(5); | ||
| for (var i = 0; i < array.length; ++i) array[i] = i / 2; | ||
| ws.send(array, {binary: true, mask: true}); | ||
| }); | ||
| ``` | ||
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| Setting `mask`, as done for the send options above, will cause the data to be masked according to the websocket protocol. The same option applies for text data. | ||
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| ### Server example ### | ||
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| ```js | ||
| var WebSocketServer = require('ws').Server | ||
| , wss = new WebSocketServer({port: 8080}); | ||
| wss.on('connection', function(ws) { | ||
| ws.on('message', function(message) { | ||
| console.log('received: %s', message); | ||
| }); | ||
| ws.send('something'); | ||
| }); | ||
| ``` | ||
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| ### Error handling best practices ### | ||
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| ```js | ||
| // If the WebSocket is closed before the following send is attempted | ||
| ws.send('something'); | ||
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| // Errors (both immediate and async write errors) can be detected in an optional callback. | ||
| // The callback is also the only way of being notified that data has actually been sent. | ||
| ws.send('something', function(error) { | ||
| // if error is null, the send has been completed, | ||
| // otherwise the error object will indicate what failed. | ||
| }); | ||
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| // Immediate errors can also be handled with try/catch-blocks, but **note** | ||
| // that since sends are inherently asynchronous, socket write failures will *not* | ||
| // be captured when this technique is used. | ||
| try { | ||
| ws.send('something'); | ||
| } | ||
| catch (e) { | ||
| // handle error | ||
| } | ||
| ``` | ||
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| ### echo.websocket.org demo ### | ||
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| ```js | ||
| var WebSocket = require('ws'); | ||
| var ws = new WebSocket('ws://echo.websocket.org/', {protocolVersion: 8, origin: 'http://websocket.org'}); | ||
| ws.on('open', function() { | ||
| console.log('connected'); | ||
| ws.send(Date.now().toString(), {mask: true}); | ||
| }); | ||
| ws.on('close', function() { | ||
| console.log('disconnected'); | ||
| }); | ||
| ws.on('message', function(data, flags) { | ||
| console.log('Roundtrip time: ' + (Date.now() - parseInt(data)) + 'ms', flags); | ||
| setTimeout(function() { | ||
| ws.send(Date.now().toString(), {mask: true}); | ||
| }, 500); | ||
| }); | ||
| ``` | ||
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| ### wscat against echo.websocket.org ### | ||
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| $ npm install -g ws | ||
| $ wscat -c ws://echo.websocket.org -p 8 | ||
| connected (press CTRL+C to quit) | ||
| > hi there | ||
| < hi there | ||
| > are you a happy parrot? | ||
| < are you a happy parrot? | ||
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| ### Other examples ### | ||
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| For a full example with a browser client communicating with a ws server, see the examples folder. | ||
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| Note that the usage together with Express 3.0 is quite different from Express 2.x. The difference is expressed in the two different serverstats-examples. | ||
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| Otherwise, see the test cases. | ||
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| ### Running the tests ### | ||
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| `make test` | ||
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| ## API Docs ## | ||
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| See the doc/ directory for Node.js-like docs for the ws classes. | ||
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| ## License ## | ||
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| (The MIT License) | ||
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| Copyright (c) 2011 Einar Otto Stangvik <einaros@gmail.com> | ||
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| Permission is hereby granted, free of charge, to any person obtaining | ||
| a copy of this software and associated documentation files (the | ||
| 'Software'), to deal in the Software without restriction, including | ||
| without limitation the rights to use, copy, modify, merge, publish, | ||
| distribute, sublicense, and/or sell copies of the Software, and to | ||
| permit persons to whom the Software is furnished to do so, subject to | ||
| the following conditions: | ||
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| The above copyright notice and this permission notice shall be | ||
| included in all copies or substantial portions of the Software. | ||
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| THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, | ||
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | ||
| CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | ||
| TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | ||
| SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| Fork of `ws` for better streaming |
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you should pull req this!