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jquery.atmosphere.js
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jquery.atmosphere.js
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/*
* Copyright 2014 Jeanfrancois Arcand
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Atmosphere.js
* https://github.com/Atmosphere/atmosphere-javascript
*
* Requires
* - jQuery 2.0.3 http://jquery.com/
*
* API reference
* https://github.com/Atmosphere/atmosphere/wiki/jQuery.atmosphere.js-API
*
* Highly inspired by
* - Portal by Donghwan Kim http://flowersinthesand.github.io/portal/
*/
(function(factory) {
if (typeof define === 'function' && define.amd) {
// AMD
define(['jquery'], factory);
} else {
// Browser globals, Window
factory(jQuery);
}
}(function(jQuery) {
jQuery(window).bind("unload.atmosphere", function () {
jQuery.atmosphere.unsubscribe();
});
jQuery(window).bind("offline", function () {
jQuery.atmosphere.unsubscribe();
});
// Prevent ESC to kill the connection from Firefox.
jQuery(window).keypress(function (e) {
if (e.keyCode === 27) {
e.preventDefault();
}
});
var parseHeaders = function (headerString) {
var match, rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, headers = {};
while (match = rheaders.exec(headerString)) {
headers[match[1]] = match[2];
}
return headers;
};
jQuery.atmosphere = {
version: "2.1.6-jquery",
uuid : 0,
requests: [],
callbacks: [],
onError: function (response) {
},
onClose: function (response) {
},
onOpen: function (response) {
},
onMessage: function (response) {
},
onReconnect: function (request, response) {
},
onMessagePublished: function (response) {
},
onTransportFailure: function (errorMessage, _request) {
},
onLocalMessage: function (response) {
},
onClientTimeout: function(request){
},
onFailureToReconnect: function (request, response) {
},
AtmosphereRequest: function (options) {
/**
* {Object} Request parameters.
*
* @private
*/
var _request = {
timeout: 300000,
method: 'GET',
headers: {},
contentType: '',
callback: null,
url: '',
data: '',
suspend: true,
maxRequest: -1,
reconnect: true,
maxStreamingLength: 10000000,
lastIndex: 0,
logLevel: 'info',
requestCount: 0,
fallbackMethod: 'GET',
fallbackTransport: 'streaming',
transport: 'long-polling',
webSocketImpl: null,
webSocketBinaryType: null,
dispatchUrl: null,
webSocketPathDelimiter: "@@",
enableXDR: false,
rewriteURL: false,
attachHeadersAsQueryString: true,
executeCallbackBeforeReconnect: false,
readyState: 0,
lastTimestamp: 0,
withCredentials: false,
trackMessageLength: false,
messageDelimiter: '|',
connectTimeout: -1,
reconnectInterval: 0,
dropHeaders: true,
uuid: 0,
shared: false,
readResponsesHeaders: false,
maxReconnectOnClose: 5,
enableProtocol: true,
pollingInterval : 0,
onError: function (response) {
},
onClose: function (response) {
},
onOpen: function (response) {
},
onMessage: function (response) {
},
onReopen: function (request, response) {
},
onReconnect: function (request, response) {
},
onMessagePublished: function (response) {
},
onTransportFailure: function (reason, request) {
},
onLocalMessage: function (request) {
},
onFailureToReconnect: function (request, response) {
},
onClientTimeout: function(request){
}
};
/**
* {Object} Request's last response.
*
* @private
*/
var _response = {
status: 200,
reasonPhrase: "OK",
responseBody: '',
messages: [],
headers: [],
state: "messageReceived",
transport: "polling",
error: null,
request: null,
partialMessage: "",
errorHandled: false,
closedByClientTimeout: false
};
/**
* {websocket} Opened web socket.
*
* @private
*/
var _websocket = null;
/**
* {SSE} Opened SSE.
*
* @private
*/
var _sse = null;
/**
* {XMLHttpRequest, ActiveXObject} Opened ajax request (in case of http-streaming or long-polling)
*
* @private
*/
var _activeRequest = null;
/**
* {Object} Object use for streaming with IE.
*
* @private
*/
var _ieStream = null;
/**
* {Object} Object use for jsonp transport.
*
* @private
*/
var _jqxhr = null;
/**
* {boolean} If request has been subscribed or not.
*
* @private
*/
var _subscribed = true;
/**
* {number} Number of test reconnection.
*
* @private
*/
var _requestCount = 0;
/**
* {boolean} If request is currently aborded.
*
* @private
*/
var _abordingConnection = false;
/**
* A local "channel' of communication.
*
* @private
*/
var _localSocketF = null;
/**
* The storage used.
*
* @private
*/
var _storageService;
/**
* Local communication
*
* @private
*/
var _localStorageService = null;
/**
* A Unique ID
*
* @private
*/
var guid = jQuery.now();
/** Trace time */
var _traceTimer;
/** Key for connection sharing */
var _sharingKey;
// Automatic call to subscribe
_subscribe(options);
/**
* Initialize atmosphere request object.
*
* @private
*/
function _init() {
_subscribed = true;
_abordingConnection = false;
_requestCount = 0;
_websocket = null;
_sse = null;
_activeRequest = null;
_ieStream = null;
}
/**
* Re-initialize atmosphere object.
*
* @private
*/
function _reinit() {
_clearState();
_init();
}
/**
* Subscribe request using request transport. <br>
* If request is currently opened, this one will be closed.
*
* @param {Object} Request parameters.
* @private
*/
function _subscribe(options) {
_reinit();
_request = jQuery.extend(_request, options);
// Allow at least 1 request
_request.mrequest = _request.reconnect;
if (!_request.reconnect) {
_request.reconnect = true;
}
}
/**
* Check if web socket is supported (check for custom implementation provided by request object or browser implementation).
*
* @returns {boolean} True if web socket is supported, false otherwise.
* @private
*/
function _supportWebsocket() {
return _request.webSocketImpl != null || window.WebSocket || window.MozWebSocket;
}
/**
* Check if server side events (SSE) is supported (check for custom implementation provided by request object or browser implementation).
*
* @returns {boolean} True if web socket is supported, false otherwise.
* @private
*/
function _supportSSE() {
return window.EventSource;
}
/**
* Open request using request transport. <br>
* If request transport is 'websocket' but websocket can't be opened, request will automatically reconnect using fallback transport.
*
* @private
*/
function _execute() {
// Shared across multiple tabs/windows.
if (_request.shared) {
_localStorageService = _local(_request);
if (_localStorageService != null) {
if (_request.logLevel === 'debug') {
jQuery.atmosphere.debug("Storage service available. All communication will be local");
}
if (_localStorageService.open(_request)) {
// Local connection.
return;
}
}
if (_request.logLevel === 'debug') {
jQuery.atmosphere.debug("No Storage service available.");
}
// Wasn't local or an error occurred
_localStorageService = null;
}
// Protocol
_request.firstMessage = jQuery.atmosphere.uuid == 0 ? true : false;
_request.isOpen = false;
_request.ctime = jQuery.now();
// We carry any UUID set by the user or from a previous connection.
if (_request.uuid === 0) {
_request.uuid = jQuery.atmosphere.uuid;
}
_request.closedByClientTimeout = false;
if (_request.transport !== 'websocket' && _request.transport !== 'sse') {
_executeRequest(_request);
} else if (_request.transport === 'websocket') {
if (!_supportWebsocket()) {
_reconnectWithFallbackTransport("Websocket is not supported, using request.fallbackTransport (" + _request.fallbackTransport
+ ")");
} else {
_executeWebSocket(false);
}
} else if (_request.transport === 'sse') {
if (!_supportSSE()) {
_reconnectWithFallbackTransport("Server Side Events(SSE) is not supported, using request.fallbackTransport ("
+ _request.fallbackTransport + ")");
} else {
_executeSSE(false);
}
}
}
function _local(request) {
var trace, connector, orphan, name = "atmosphere-" + request.url, connectors = {
storage: function () {
if (!jQuery.atmosphere.supportStorage()) {
return;
}
var storage = window.localStorage, get = function (key) {
return jQuery.parseJSON(storage.getItem(name + "-" + key));
}, set = function (key, value) {
storage.setItem(name + "-" + key, jQuery.stringifyJSON(value));
};
return {
init: function () {
set("children", get("children").concat([guid]));
jQuery(window).on("storage.socket", function (event) {
event = event.originalEvent;
if (event.key === name && event.newValue) {
listener(event.newValue);
}
});
return get("opened");
},
signal: function (type, data) {
storage.setItem(name, jQuery.stringifyJSON({
target: "p",
type: type,
data: data
}));
},
close: function () {
var index, children = get("children");
jQuery(window).off("storage.socket");
if (children) {
index = jQuery.inArray(request.id, children);
if (index > -1) {
children.splice(index, 1);
set("children", children);
}
}
}
};
},
windowref: function () {
var win = window.open("", name.replace(/\W/g, ""));
if (!win || win.closed || !win.callbacks) {
return;
}
return {
init: function () {
win.callbacks.push(listener);
win.children.push(guid);
return win.opened;
},
signal: function (type, data) {
if (!win.closed && win.fire) {
win.fire(jQuery.stringifyJSON({
target: "p",
type: type,
data: data
}));
}
},
close: function () {
function remove(array, e) {
var index = jQuery.inArray(e, array);
if (index > -1) {
array.splice(index, 1);
}
}
// Removes traces only if the parent is alive
if (!orphan) {
remove(win.callbacks, listener);
remove(win.children, guid);
}
}
};
}
};
// Receives open, close and message command from the parent
function listener(string) {
var command = jQuery.parseJSON(string), data = command.data;
if (command.target === "c") {
switch (command.type) {
case "open":
_open("opening", 'local', _request);
break;
case "close":
if (!orphan) {
orphan = true;
if (data.reason === "aborted") {
_close();
} else {
// Gives the heir some time to reconnect
if (data.heir === guid) {
_execute();
} else {
setTimeout(function () {
_execute();
}, 100);
}
}
}
break;
case "message":
_prepareCallback(data, "messageReceived", 200, request.transport);
break;
case "localMessage":
_localMessage(data);
break;
}
}
}
function findTrace() {
var matcher = new RegExp("(?:^|; )(" + encodeURIComponent(name) + ")=([^;]*)").exec(document.cookie);
if (matcher) {
return jQuery.parseJSON(decodeURIComponent(matcher[2]));
}
}
// Finds and validates the parent socket's trace from the cookie
trace = findTrace();
if (!trace || jQuery.now() - trace.ts > 1000) {
return;
}
// Chooses a connector
connector = connectors.storage() || connectors.windowref();
if (!connector) {
return;
}
return {
open: function () {
var parentOpened;
// Checks the shared one is alive
_traceTimer = setInterval(function () {
var oldTrace = trace;
trace = findTrace();
if (!trace || oldTrace.ts === trace.ts) {
// Simulates a close signal
listener(jQuery.stringifyJSON({
target: "c",
type: "close",
data: {
reason: "error",
heir: oldTrace.heir
}
}));
}
}, 1000);
parentOpened = connector.init();
if (parentOpened) {
// Firing the open event without delay robs the user of the opportunity to bind connecting event handlers
setTimeout(function () {
_open("opening", 'local', request);
}, 50);
}
return parentOpened;
},
send: function (event) {
connector.signal("send", event);
},
localSend: function (event) {
connector.signal("localSend", jQuery.stringifyJSON({
id: guid,
event: event
}));
},
close: function () {
// Do not signal the parent if this method is executed by the unload event handler
if (!_abordingConnection) {
clearInterval(_traceTimer);
connector.signal("close");
connector.close();
}
}
};
}
function share() {
var storageService, name = "atmosphere-" + _request.url, servers = {
// Powered by the storage event and the localStorage
// http://www.w3.org/TR/webstorage/#event-storage
storage: function () {
if (!jQuery.atmosphere.supportStorage()) {
return;
}
var storage = window.localStorage;
return {
init: function () {
// Handles the storage event
jQuery(window).on("storage.socket", function (event) {
event = event.originalEvent;
// When a deletion, newValue initialized to null
if (event.key === name && event.newValue) {
listener(event.newValue);
}
});
},
signal: function (type, data) {
storage.setItem(name, jQuery.stringifyJSON({
target: "c",
type: type,
data: data
}));
},
get: function (key) {
return jQuery.parseJSON(storage.getItem(name + "-" + key));
},
set: function (key, value) {
storage.setItem(name + "-" + key, jQuery.stringifyJSON(value));
},
close: function () {
jQuery(window).off("storage.socket");
storage.removeItem(name);
storage.removeItem(name + "-opened");
storage.removeItem(name + "-children");
}
};
},
// Powered by the window.open method
// https://developer.mozilla.org/en/DOM/window.open
windowref: function () {
// Internet Explorer raises an invalid argument error
// when calling the window.open method with the name containing non-word characters
var neim = name.replace(/\W/g, ""), win = (jQuery('iframe[name="' + neim + '"]')[0] || jQuery(
'<iframe name="' + neim + '" />').hide().appendTo("body")[0]).contentWindow;
return {
init: function () {
// Callbacks from different windows
win.callbacks = [listener];
// In IE 8 and less, only string argument can be safely passed to the function in other window
win.fire = function (string) {
var i;
for (i = 0; i < win.callbacks.length; i++) {
win.callbacks[i](string);
}
};
},
signal: function (type, data) {
if (!win.closed && win.fire) {
win.fire(jQuery.stringifyJSON({
target: "c",
type: type,
data: data
}));
}
},
get: function (key) {
return !win.closed ? win[key] : null;
},
set: function (key, value) {
if (!win.closed) {
win[key] = value;
}
},
close: function () {
}
};
}
};
// Receives send and close command from the children
function listener(string) {
var command = jQuery.parseJSON(string), data = command.data;
if (command.target === "p") {
switch (command.type) {
case "send":
_push(data);
break;
case "localSend":
_localMessage(data);
break;
case "close":
_close();
break;
}
}
}
_localSocketF = function propagateMessageEvent(context) {
storageService.signal("message", context);
};
function leaveTrace() {
document.cookie = _sharingKey + "=" +
// Opera's JSON implementation ignores a number whose a last digit of 0 strangely
// but has no problem with a number whose a last digit of 9 + 1
encodeURIComponent(jQuery.stringifyJSON({
ts: jQuery.now() + 1,
heir: (storageService.get("children") || [])[0]
})) + "; path=/";
}
// Chooses a storageService
storageService = servers.storage() || servers.windowref();
storageService.init();
if (_request.logLevel === 'debug') {
jQuery.atmosphere.debug("Installed StorageService " + storageService);
}
// List of children sockets
storageService.set("children", []);
if (storageService.get("opened") != null && !storageService.get("opened")) {
// Flag indicating the parent socket is opened
storageService.set("opened", false);
}
// Leaves traces
_sharingKey = encodeURIComponent(name);
leaveTrace();
_traceTimer = setInterval(leaveTrace, 1000);
_storageService = storageService;
}
/**
* @private
*/
function _open(state, transport, request) {
if (_request.shared && transport !== 'local') {
share();
}
if (_storageService != null) {
_storageService.set("opened", true);
}
request.close = function () {
_close();
};
if (_requestCount > 0 && state === 're-connecting') {
request.isReopen = true;
_tryingToReconnect(_response);
} else if (_response.error == null) {
_response.request = request;
var prevState = _response.state;
_response.state = state;
var prevTransport = _response.transport;
_response.transport = transport;
var _body = _response.responseBody;
_invokeCallback();
_response.responseBody = _body;
_response.state = prevState;
_response.transport = prevTransport;
}
}
/**
* Execute request using jsonp transport.
*
* @param request {Object} request Request parameters, if undefined _request object will be used.
* @private
*/
function _jsonp(request) {
// When CORS is enabled, make sure we force the proper transport.
request.transport = "jsonp";
var rq = _request;
if ((request != null) && (typeof (request) !== 'undefined')) {
rq = request;
}
var url = rq.url;
if (rq.dispatchUrl != null) {
url += rq.dispatchUrl;
}
var data = rq.data;
if (rq.attachHeadersAsQueryString) {
url = _attachHeaders(rq);
if (data !== '') {
url += "&X-Atmosphere-Post-Body=" + encodeURIComponent(data);
}
data = '';
}
_jqxhr = jQuery.ajax({
url: url,
type: rq.method,
dataType: "jsonp",
error: function (jqXHR, textStatus, errorThrown) {
_response.error = true;
if (rq.openId) {
clearTimeout(rq.openId);
}
if (rq.reconnect && _requestCount++ < rq.maxReconnectOnClose) {
_open('re-connecting', rq.transport, rq);
_reconnect(_jqxhr, rq, rq.reconnectInterval);
rq.openId = setTimeout(function() {
_triggerOpen(rq);
}, rq.reconnectInterval + 1000);
} else {
_onError(jqXHR.status, errorThrown);
}
},
jsonp: "jsonpTransport",
success: function (json) {
if (rq.reconnect) {
if (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest) {
_readHeaders(_jqxhr, rq);
if (!rq.executeCallbackBeforeReconnect) {
_reconnect(_jqxhr, rq, rq.pollingInterval);
}
var msg = json.message;
if (msg != null && typeof msg !== 'string') {
try {
msg = jQuery.stringifyJSON(msg);
} catch (err) {
// The message was partial
}
}
var skipCallbackInvocation = _trackMessageSize(msg, rq, _response);
if (!skipCallbackInvocation) {
_prepareCallback(_response.responseBody, "messageReceived", 200, rq.transport);
}
if (rq.executeCallbackBeforeReconnect) {
_reconnect(_jqxhr, rq, rq.pollingInterval);
}
} else {
jQuery.atmosphere.log(_request.logLevel, ["JSONP reconnect maximum try reached " + _request.requestCount]);
_onError(0, "maxRequest reached");
}
}
},
data: rq.data,
beforeSend: function (jqXHR) {
_doRequest(jqXHR, rq, false);
}
});
}
/**
* Execute request using ajax transport.
*
* @param request {Object} request Request parameters, if undefined _request object will be used.
* @private
*/
function _ajax(request) {
var rq = _request;
if ((request != null) && (typeof (request) !== 'undefined')) {
rq = request;
}
var url = rq.url;
if (rq.dispatchUrl != null) {
url += rq.dispatchUrl;
}
var data = rq.data;
if (rq.attachHeadersAsQueryString) {
url = _attachHeaders(rq);
if (data !== '') {
url += "&X-Atmosphere-Post-Body=" + encodeURIComponent(data);
}
data = '';
}
var async = typeof (rq.async) !== 'undefined' ? rq.async : true;
_jqxhr = jQuery.ajax({
url: url,
type: rq.method,
error: function (jqXHR, textStatus, errorThrown) {
_response.error = true;
if (jqXHR.status < 300) {
_reconnect(_jqxhr, rq);
} else {
_onError(jqXHR.status, errorThrown);
}
},
success: function (data, textStatus, jqXHR) {
if (rq.reconnect) {
if (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest) {
if (!rq.executeCallbackBeforeReconnect) {
_reconnect(_jqxhr, rq, rq.pollingInterval);
}
var skipCallbackInvocation = _trackMessageSize(data, rq, _response);
if (!skipCallbackInvocation) {
_prepareCallback(_response.responseBody, "messageReceived", 200, rq.transport);
}
if (rq.executeCallbackBeforeReconnect) {
_reconnect(_jqxhr, rq, rq.pollingInterval);
}
} else {
jQuery.atmosphere.log(_request.logLevel, ["AJAX reconnect maximum try reached " + _request.requestCount]);
_onError(0, "maxRequest reached");
}
}
},
beforeSend: function (jqXHR) {
_doRequest(jqXHR, rq, false);
},
crossDomain: rq.enableXDR,
async: async
});
}
/**
* Build websocket object.
*
* @param location {string} Web socket url.
* @returns {websocket} Web socket object.
* @private
*/
function _getWebSocket(location) {
if (_request.webSocketImpl != null) {
return _request.webSocketImpl;
} else {
if (window.WebSocket) {
return new WebSocket(location);
} else {
return new MozWebSocket(location);
}
}
}
/**
* Build web socket url from request url.
*
* @return {string} Web socket url (start with "ws" or "wss" for secure web socket).
* @private
*/
function _buildWebSocketUrl() {
var url = _attachHeaders(_request);
return decodeURI(jQuery('<a href="' + url + '"/>')[0].href.replace(/^http/, "ws"));
}
/**
* Build SSE url from request url.
*
* @return a url with Atmosphere's headers
* @private
*/
function _buildSSEUrl() {
var url = _attachHeaders(_request);
return url;
}
/**
* Open SSE. <br>
* Automatically use fallback transport if SSE can't be opened.
*
* @private
*/
function _executeSSE(sseOpened) {
_response.transport = "sse";
var location = _buildSSEUrl(_request.url);
if (_request.logLevel === 'debug') {
jQuery.atmosphere.debug("Invoking executeSSE");
jQuery.atmosphere.debug("Using URL: " + location);
}
if (_request.enableProtocol && sseOpened) {
var time = jQuery.now() - _request.ctime;
_request.lastTimestamp = Number(_request.stime) + Number(time);
}
if (sseOpened && !_request.reconnect) {
if (_sse != null) {
_clearState();
}
return;
}
try {
_sse = new EventSource(location, {
withCredentials: _request.withCredentials
});
} catch (e) {
_onError(0, e);
_reconnectWithFallbackTransport("SSE failed. Downgrading to fallback transport and resending");