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Matthew Sackman
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node_modules | ||
*~ |
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module.exports = require('./lib/sockjs-client'); |
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(function (parent) { | ||
'use strict'; | ||
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var url = require('url'), | ||
http = require('http'), | ||
https = require('https'), | ||
uuid = require('node-uuid'), | ||
events = require('events'), | ||
util; | ||
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function InvalidURL (parsedURL) { | ||
this.parsedURL = parsedURL; | ||
} | ||
InvalidURL.prototype = { | ||
prototype: Error.prototype, | ||
toString: function () { return "Invalid URL: " + this.parsedURL.href; } | ||
}; | ||
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function InvalidState (extra) { | ||
this.extra = extra; | ||
} | ||
InvalidState.prototype = { | ||
prototype: Error.prototype, | ||
toString: function () { return "Invalid State " + this.extra; } | ||
}; | ||
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util = (function () { | ||
var empty = {}; | ||
return { | ||
hasOwnProperty: function (obj, field) { | ||
return empty.hasOwnProperty.call(obj, field); | ||
}, | ||
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shallowCopy: function (src, dest) { | ||
var keys = Object.keys(src), | ||
i; | ||
for (i = 0; i < keys.length; i += 1) { | ||
dest[keys[i]] = src[keys[i]]; | ||
} | ||
}, | ||
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liftFunctions: function (src, dest, fields) { | ||
var i, field; | ||
for (i = 0; i < fields.length; i += 1) { | ||
field = fields[i]; | ||
if (undefined !== src[field] && | ||
undefined !== src[field].call) { | ||
dest[field] = src[field].bind(src); | ||
} | ||
} | ||
} | ||
}; | ||
}()); | ||
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function SockJSClient (server) { | ||
var parsed, pathname, serverId, sessionId; | ||
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parsed = url.parse(server); | ||
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if ('http:' === parsed.protocol) { | ||
this.client = http; | ||
} else if ('https:' === parsed.protocol) { | ||
this.client = https; | ||
} else { | ||
throw new InvalidURL(parsed); | ||
} | ||
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pathname = parsed.pathname; | ||
while (undefined !== pathname && | ||
'/' === pathname.charAt(pathname.length - 1)) { | ||
pathname = pathname.slice(0, pathname.length - 1); | ||
} | ||
parsed.pathname = pathname; | ||
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serverId = Math.round(Math.random() * 999); | ||
sessionId = uuid(); | ||
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this.server = url.parse( | ||
parsed.protocol + "//" + parsed.host + parsed.pathname + | ||
"/" + serverId + "/" + sessionId); | ||
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this.error = Object.getPrototypeOf(this).error.bind(this); | ||
this.connection = Object.getPrototypeOf(this).connection.bind(this); | ||
this.closed = Object.getPrototypeOf(this).closed.bind(this); | ||
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this.emitter = new events.EventEmitter(); | ||
util.liftFunctions( | ||
this.emitter, this, | ||
['on', 'once', 'removeListener', 'removeAllListeners', 'emit']); | ||
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this.writeBuffer = []; | ||
} | ||
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SockJSClient.prototype = { | ||
isReady: false, | ||
isClosing: false, | ||
isClosed: false, | ||
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connect: function () { | ||
if (this.isReady || this.isClosing || this.isClosed) { | ||
return; | ||
} | ||
var transport = new XHRStreaming(this); | ||
transport.on('error', this.error); | ||
transport.on('connection', this.connection); | ||
transport.on('close', this.closed); | ||
(new StateMachine(transport)).invoke(); | ||
}, | ||
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connection: function (transport) { | ||
if (this.isClosing) { | ||
transport.close(); | ||
} else if (! (this.isReady || this.isClosed)) { | ||
this.isReady = true; | ||
this.transport = transport; | ||
this.emit('connection'); | ||
if (0 !== this.writeBuffer.length) { | ||
transport.write(this.writeBuffer); | ||
this.writeBuffer = []; | ||
} | ||
} | ||
}, | ||
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error: function () { | ||
this.isReady = false; | ||
var args = Array.prototype.slice.call(arguments, 0); | ||
args.unshift('error'); | ||
this.emit.apply(this, args); | ||
if (this.isClosing) { | ||
this.closed(); | ||
} | ||
}, | ||
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write: function (message) { | ||
if (this.isClosed || this.isClosing) { | ||
return; | ||
} else if (this.isReady) { | ||
return this.transport.write([message]); | ||
} else { | ||
this.writeBuffer.push(message); | ||
} | ||
}, | ||
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close: function () { | ||
if (! (this.isClosing || this.isClosed)) { | ||
this.isClosing = true; | ||
if (this.isReady) { | ||
this.isReady = false; | ||
this.transport.close(); | ||
} | ||
} | ||
}, | ||
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closed: function () { | ||
if (! this.isClosed) { | ||
var args = Array.prototype.slice.call(arguments, 0); | ||
args.unshift('close'); | ||
this.emit.apply(this, args); | ||
} | ||
this.isClosed = true; | ||
this.isClosing = false; | ||
this.isReady = false; | ||
} | ||
}; | ||
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function XHRStreaming (sjs) { | ||
this.sjs = sjs; | ||
this.emitter = new events.EventEmitter(); | ||
util.liftFunctions( | ||
this.emitter, this, | ||
['on', 'once', 'removeListener', 'removeAllListeners', 'emit']); | ||
this.error = Object.getPrototypeOf(this).error.bind(this); | ||
this.initialPayloadRemaining = this.initialPayloadLength; | ||
this.partialChunk = ""; | ||
} | ||
XHRStreaming.prototype = { | ||
fsm: {'start': 'connected', | ||
'connected': 'dataInitial', | ||
'dataInitial': 'dataOpen', | ||
'dataOpen': 'running', | ||
'running': 'running', | ||
'errored': 'errored' | ||
}, | ||
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initialPayloadLength: 2049, | ||
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start: function (sm) { | ||
var request = {method: 'POST'}, | ||
clientRequest; | ||
util.shallowCopy(this.sjs.server, request); | ||
request.path += '/xhr_streaming'; | ||
clientRequest = this.sjs.client.request(request, sm.stepper()); | ||
clientRequest.on('error', this.error.bind(this, sm)); | ||
clientRequest.end(); | ||
}, | ||
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write: function (message) { | ||
var request = {method: 'POST'}, | ||
clientRequest; | ||
util.shallowCopy(this.sjs.server, request); | ||
request.path += '/xhr_send'; | ||
clientRequest = this.sjs.client.request(request); | ||
clientRequest.write(JSON.stringify(message)); | ||
clientRequest.end(); | ||
}, | ||
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close: function () { | ||
if (undefined !== this.response) { | ||
this.response.removeAllListeners(); | ||
this.response.destroy(); | ||
} | ||
this.emit('close'); | ||
}, | ||
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connected: function (sm, result) { | ||
this.response = result; | ||
if (200 !== result.statusCode) { | ||
this.error(sm, result.statusCode); | ||
} else { | ||
result.setEncoding('utf8'); | ||
result.on('data', sm.stepper()); | ||
result.on('end', this.reopen.bind(this, sm)); | ||
} | ||
}, | ||
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dataInitial: function (sm, chunk) { | ||
var remaining = this.initialPayloadRemaining - chunk.length; | ||
if (0 < remaining) { | ||
this.initialPayloadRemaining = remaining; | ||
sm.switchTo('dataInitial'); | ||
} else { | ||
this.initialPayloadRemaining = this.initialPayloadLength; | ||
if (0 > remaining) { | ||
(sm.stepper())(sm, chunk.slice(this.initialPayloadRemaining)); | ||
} | ||
} | ||
}, | ||
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dataOpen: function (sm, chunk) { | ||
var fsm; | ||
chunk = this.partialChunk.concat(chunk); | ||
if (2 > chunk.length) { | ||
this.partialChunk = chunk; | ||
sm.switchTo('dataOpen'); | ||
} else { | ||
this.partialChunk = ""; | ||
if ('o\n' === chunk.slice(0, 2)) { | ||
fsm = {}; | ||
util.shallowCopy(this.fsm, fsm); | ||
this.fsm = fsm; | ||
fsm['dataInitial'] = 'running'; // from here on, another 'o\n' is an error | ||
this.emit('connection', this); | ||
if (2 < chunk.length) { | ||
(sm.stepper())(sm, chunk.slice(2)); | ||
} | ||
} else { | ||
this.error(sm, chunk); | ||
} | ||
} | ||
}, | ||
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running: function (sm, chunk) { | ||
var type; | ||
chunk = this.partialChunk.concat(chunk); | ||
if (1 < chunk.length) { | ||
type = chunk.charAt(0); | ||
switch (type) { | ||
case 'h': // heartbeat | ||
this.partialChunk = chunk.slice(2); | ||
console.log("thud"); | ||
break; | ||
case 'a': // data | ||
this.emitData(chunk, this.partialChunk.length); | ||
break; | ||
case 'c': // close frame | ||
this.partialChunk = chunk.slice(2); | ||
break; | ||
default: | ||
this.error(sm, "Unexpected frame type", type, chunk); | ||
} | ||
} | ||
}, | ||
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emitData: function (chunk, searchStart) { | ||
var index = chunk.indexOf('\n', searchStart), | ||
array, i; | ||
if (-1 === index) { | ||
this.partialChunk = chunk; | ||
} else { | ||
index += 1; | ||
if (index === chunk.length) { | ||
this.partialChunk = ""; | ||
} else { | ||
this.partialChunk = chunk.slice(index); | ||
} | ||
array = JSON.parse(chunk.slice(1, index)); | ||
for (i = 0; i < array.length; i += 1) { | ||
this.sjs.emit('data', array[i]); | ||
} | ||
} | ||
}, | ||
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reopen: function (sm) { | ||
(sm.stepper('start'))(); | ||
}, | ||
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error: function () { | ||
if (undefined !== this.response) { | ||
this.response.removeAllListeners(); | ||
this.response.destroy(); | ||
} | ||
var args = Array.prototype.slice.call(arguments, 0), | ||
sm; | ||
sm = args.shift(); | ||
sm.switchTo('errored'); | ||
this.emit('error', args); | ||
}, | ||
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errored: function () {} | ||
} | ||
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function StateMachine (callbacks) { | ||
this.callbacks = callbacks; | ||
this.stepper = Object.getPrototypeOf(this).stepper.bind(this); | ||
this.fun = this.stepper(); | ||
} | ||
StateMachine.prototype = { | ||
invoke: function () { | ||
if (undefined === this.fun) { | ||
throw new InvalidState(this); | ||
} | ||
var args = Array.prototype.slice.call(arguments, 0); | ||
args.unshift(this); | ||
return this.fun.apply(this.callbacks, args); | ||
}, | ||
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nextStateName: function () { | ||
if (util.hasOwnProperty(this, 'switchedTo')) { | ||
return this.switchedTo; | ||
} else if (util.hasOwnProperty(this, 'stateName')) { | ||
return this.callbacks.fsm[this.stateName]; | ||
} else { | ||
return 'start'; | ||
} | ||
}, | ||
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switchTo: function (name) { | ||
if (undefined === name) { | ||
delete this.switchedTo; | ||
} else { | ||
this.switchedTo = name; | ||
} | ||
}, | ||
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stepper: function (name) { | ||
return (function () { | ||
if (undefined !== name) { | ||
this.switchTo(name); | ||
} | ||
this.stateName = this.nextStateName(); | ||
this.switchTo(); | ||
this.fun = this.callbacks[this.stateName]; | ||
this.invoke.apply(this, arguments); | ||
}).bind(this); | ||
} | ||
}; | ||
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exports.create = function (url) { | ||
var sjsc = new SockJSClient(url); | ||
sjsc.connect(); | ||
return sjsc; | ||
}; | ||
exports.InvalidURL = InvalidURL; | ||
exports.InvalidState = InvalidState; | ||
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}(this)); |
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{ | ||
"name": "sockjs-client", | ||
"author": "Matthew Sackman", | ||
"version": "0.1", | ||
"repository": { | ||
"type": "git", | ||
"url": "git://github.com/sockjs/sockjs-client-node.git" | ||
}, | ||
"main": "index", | ||
"description": "Client library for SockJS", | ||
"dependencies": { | ||
"node-uuid": "1.3.3" | ||
} | ||
} |