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  1. +1 −0 .gitignore
  2. +127 −0 README.md
  3. +11 −0 bndry/auth.js
  4. +338 −0 bndry/data-source.js
  5. +103 −0 example-volume-graph.js
  6. +82 −0 index.html
  7. +4 −0 lib/jquery-1.6.4.min.js
  8. +20 −0 lib/jquery.cometd-timesync.js
  9. +121 −0 lib/jquery.cometd.js
  10. +2,840 −0 lib/org/cometd.js
  11. +197 −0 lib/org/cometd/TimeSyncExtension.js
1 .gitignore
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+.DS_Store
127 README.md
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+# Boundary JavaScript API
+
+### October Preview
+
+---
+
+Note: This documentation represents the current status of the Boundary JavaScript API as of October 12, 2012. While we will make a best effort to maintain compatibility and provide advance notice of API changes, all APIs and output formats described below are subject to change.
+
+## Overview
+
+The Boundary JavaScript API encapsulates the functionality required to authenticate and manage CometD subscriptions to the Boundary Streaming API service. The JavaScript API allows you to retrieve streaming JSON data from various Boundary endpoints, or "data sources," and associate that incoming data with any JavaScript object that implements an "update" method. One common use of this functionality would be to create browser-based visualizations of the data being reported for your organization.
+
+## External Requirements
+
+The following files, supplied in the repository, are required to run the JavaScript API:
+
+* **/lib/jquery-1.6.4.min.js** - jQuery (any recent version will do)
+* **/lib/org/cometd.js** - CometD
+* **/lib/org/cometd/TimeSyncExtension.j**s - TimeSyncExtension for CometD
+* **/lib/jquery.cometd.js** and **lib/jquery.cometd-timesync.js** - jQuery CometD bindings
+
+## API Files
+
+The Boundary JavaScript API itself is comprised of two files:
+
+* **/bndry/auth.js** - stores credentials for subscribing to the Boundary Streaming service
+* **/bndry/data-source.js** - defines the bndry.dataSource object, which is used to create query-specific data sources, which can be subscribed to by other objects
+
+**NOTE: You will need to edit the auth.js file with your Boundary account information in order to use the JavaScript API.** You can find this information at [https://boundary.com/account](https://boundary.com/account).
+
+## The Bndry Namespace
+
+The Boundary JavaScript API defines a base object called **bndry** in the global namespace. It has two child objects:
+
+* **bndry.auth** - object representing the credentials necessary for subscribing to data from the Streaming API
+* **bndry.dataSource** - a method for creating dataSources.
+
+## Authentication
+
+In order for the Boundary JavaScript API to function, the bndry.auth object must be defined.
+
+ bndry = bndry || {};
+ bndry.auth = {
+ cometd: "https://api.boundary.com/streaming",
+ user: [user email],
+ org_id: [org_id string],
+ apikey: [api key]
+ };
+
+In the repo, this is defined in **/bndry/auth.js**. You will need to replace the information in that file with your own account credentials, which may be retrieved from [https://boundary.com/account](https://boundary.com/account).
+
+## Data Sources
+
+Once the auth object is defined, you must include the **/bndry/data-source.js** file, which will create the **bndry.dataSource** method. Calling this method will return a new dataSource instance, which other objects may subscribe to:
+
+ bndry.dataSource(query, [update_interval])
+
+An optional update interval value may be passed to the dataSource method to force the dataSource to return updates at regular intervals, instead of waiting for updates from the server. This is most useful at the 1 second time resolution, to smooth out updates.
+
+An example:
+
+ var source = bndry.dataSource('volume_1s', 1000);
+
+## Subscribing to a dataSource
+
+Once a dataSource instance has been created, any number of arbitrary objects that define an "update" method may subscribe to it. A dataSource defines the following methods.
+
+### addSubscriber
+
+ datasource.addSubscriber(object) -> subscription_id
+
+Registers an object that defines an update method to start recieving data from the Streaming service. It returns a subscription object, which may be used to unsubscribe the object from that dataSource. Speaking of which…
+
+### removeSubscriber
+
+ datasource.removeSubscriber(subscription_id)
+
+Deregisters an object from recieving updates from a dataSource.
+
+#### Example
+
+Subscribing to a total volume per second stream, with an optional forced update interval of one second:
+
+ var source = bndry.dataSource('volume_1s', 1000);
+ var logger = {
+ update: function (data) {
+ console.log(data);
+ }
+ };
+ var subscription = source.addSubscriber(logger);
+
+## dataSource subscribers
+
+Once an object has subscribed to updates from a dataSource, it will begin recieving data objects via it's own update method. Note that a subscriber object **must** implement an update method, and may also implement an optional dataProcessor method.
+
+### dataProcessor(data, callback)
+
+If defined, the dataSource will call this method to process the raw subscription data into a different format. It must be returned via the supplied callback before it can be handed off to the object's update method.
+
+An example:
+
+ var source = bndry.dataSource('volume_1s', 1000);
+ var logger = {
+ dataProcessor: function (data, callback) {
+ var ingressOctets = [];
+ for (s in data.state) {
+ ingressOctets.push(data.state[s].ingressOctetTotalCount);
+ }
+ },
+ update: function (octetList) {
+ console.log(octetList);
+ }
+ };
+ var subscription = source.addSubscriber(logger);
+
+
+### update(data)
+
+This required method recieves updates from the dataSource. If a dataProcessor method was not defined, then the format of this object is described below. Otherwise, the format of will be defined by the dataProcessor method.
+
+## The data object
+
+Updates from the Streaming API are processed by the dataSource and delivered to subscribers in the following format:
+
+* **state** - list of all currently tracked samples, categorized by a unique field named \_\_key\_\_
+* **added** - list of samples added to the state set since the last update
+* **removed** - list of samples removed from the state set since the last update
11 bndry/auth.js
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+/* Visit https://boundary.com/account to get your account credentials for this file */
+var bndry = bndry || {};
+
+(function (bndry, undefined) {
+ bndry.auth = {
+ cometd: "https://api.boundary.com/streaming",
+ user: <account email>,
+ org_id: <account org id>,
+ apikey: <account api key>
+ };
+})(bndry);
338 bndry/data-source.js
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+var bndry = bndry || {};
+if (!console) { var console = { log: function () {} }; }
+
+(function (bndry, $, undefined) {
+ var uid = 0;
+
+ if (!bndry.auth) {
+ throw new Error('Auth credentials not defined');
+ return;
+ }
+
+ var struct = {
+ pack: function (objects) {
+ var schema = [], // holds the schema to include in the compressed output
+ data = [], // holds a list of all compressed data elements encoded using schema
+ key,
+ object,
+ element,
+ o, oLen, // iterators
+ s, sLen;
+
+ if (objects.length > 0) {
+ for (key in objects[0]) {
+ if (objects[0].hasOwnProperty(key)) {
+ schema.push(key);
+ }
+ }
+
+ for (o = 0, oLen = objects.length; o < oLen; o++) {
+ object = objects[o];
+ element = [];
+
+ for (s = 0, sLen = schema.length; s < sLen; s++) {
+ // get the name of this schema element
+ key = schema[s];
+ element[s] = object[key];
+ }
+
+ data.push(element);
+ }
+ }
+
+ return {
+ schema: schema,
+ data: data
+ };
+
+ },
+
+ unpack: function (payload) {
+ var schema,
+ keys,
+ data,
+ objects,
+ object,
+ element,
+ key,
+ d, dLen,
+ s, sLen,
+ tmp;
+
+ if (payload.constructor == Array) {
+ // nothing to do here
+ return payload;
+ }
+
+ schema = payload.schema;
+ keys = payload.keys ? payload.keys : [];
+ data = payload.data;
+ objects = [];
+
+ // cache schema length for use in inner loop
+ sLen = schema.length;
+
+ for (d = 0, dLen = data.length; d < dLen; d++) {
+ element = data[d];
+ object = {};
+ object.__key__ = null; // pre-allocate this so it is ordered first
+
+ for (s = 0; s < sLen; s++) {
+ key = schema[s];
+ object[key] = element[s];
+ }
+
+ tmp = [];
+ for (key in keys) {
+ tmp.push(object[keys[key]]);
+ }
+
+ object.__key__ = tmp.join(":");
+ objects.push(object);
+ }
+
+ return objects;
+ }
+ };
+
+ var streakerClient = (function () {
+ var auth = bndry.auth,
+ cometdEndpoint = auth.cometd,
+ org_id = auth.org_id,
+ user = auth.user,
+ apikey = auth.apikey,
+
+ started = false;
+
+ $.cometd.configure(cometdEndpoint);
+
+ $.cometd.addListener("/meta/subscribe", function (message) {
+ console.log("subscribed");
+ });
+
+ $.cometd.addListener("/meta/handshake", function (message) {
+ if (message.successful) {
+ console.log("handshake - " + message.clientId);
+ started = true;
+ }
+ });
+
+ $.cometd.handshake({
+ ext: {
+ authentication: {
+ user: user,
+ token: apikey
+ }
+ }
+ });
+
+ $.cometd.onListenerException = function(msg, query) {
+ throw msg;
+ };
+
+ return {
+ servertime: function () {
+ return $.cometd.timesync.getServerTime();
+ },
+ subscribe: function (query, handler, options) {
+ query = options.subscriber == 'opaque' ? "/opaque/" + org_id + "/" + query : "/query/" + org_id + "/" + query;
+ return $.cometd.subscribe(query, handler);
+ },
+ unsubscribe: function (subscription) {
+ $.cometd.unsubscribe(subscription);
+ },
+ isStarted: function () {
+ return started;
+ }
+ };
+ })();
+
+ var dataSource = function (query, updateInterval, options) {
+ var subscribers = {},
+ subscriberCount = 0,
+ streakerID = null,
+ lastData = null;
+
+ // constants
+ var WAITING = -1;
+
+ var state = (function () {
+ var current = {};
+
+ return {
+ get: function () { return current; },
+
+ update: function (added, removed) {
+ var i, len;
+
+ for (i = 0, len = removed ? removed.length : 0; i < len; ++i) {
+ delete current[removed[i].__key__];
+ }
+
+ for (i = 0, len = added ? added.length : 0; i < len; ++i) {
+ current[added[i].__key__] = added[i];
+ };
+
+ return current;
+ }
+ };
+ })();
+
+ var expandData = (function () {
+ var schema, // holds a mapping of array offsets to field names; use this to expand compressed objects before emitting to consumers
+ keys; // list of field names that make up unique key
+
+ function expand(source) {
+ var out = [];
+
+ out = struct.unpack({
+ schema: schema,
+ keys: keys,
+ data: source
+ });
+
+ return out;
+ };
+
+ return function (msg) {
+ var data = msg.data,
+ added = null,
+ removed = null;
+
+ if (data.schema) {
+ schema = data.schema;
+ }
+
+ if (data.keys) {
+ keys = data.keys;
+ }
+
+ if (schema) {
+ if (data.insert) {
+ added = expand(data.insert);
+ }
+
+ if (data.remove) {
+ removed = expand(data.remove);
+ }
+ }
+
+ return {
+ added: added,
+ removed: removed
+ };
+ };
+ })();
+
+ function update(data) {
+ var subscriber, s;
+
+ function postUpdate(s) {
+ return function (data) {
+ s.update(data);
+ };
+ }
+
+ if (updateInterval || data.added || data.removed) {
+ data.state = state.update(data.added, data.removed);
+
+ for (s in subscribers) {
+ subscriber = subscribers[s];
+
+ // see if this subscriber requested the data be processed in a specific way
+ if (subscriber.dataProcessor && typeof subscriber.dataProcessor === 'function') {
+ subscriber.dataProcessor(data, postUpdate(subscriber));
+ } else {
+ postUpdate(subscriber)(data);
+ }
+ }
+
+ lastData = data;
+ }
+ }
+
+ function streakerUpdate(msg) {
+ var data = expandData(msg);
+
+ update(data);
+ }
+
+ var intervalUpdate = (function () {
+ var timer,
+ updates = {};
+
+ return function (msg) {
+ var data = expandData(msg),
+ d;
+
+ for (d in data) {
+ if (!updates[d]) {
+ updates[d] = data[d];
+ } else if (data[d]) {
+ updates[d] = updates[d].concat(data[d]);
+ }
+ }
+
+ if (!timer) {
+ timer = window.setInterval(function () {
+ update(updates);
+ updates = {};
+ }, updateInterval);
+ }
+ };
+ })();
+
+ function connect() {
+ if (!streakerID || streakerID === WAITING) {
+ if (streakerClient.isStarted()) {
+ streakerID = streakerClient.subscribe(query, updateInterval ? intervalUpdate : streakerUpdate, options || {});
+ } else {
+ streakerID = WAITING;
+ window.setTimeout(connect, 100);
+ }
+ }
+ }
+
+ function disconnect() {
+ if (streakerID) {
+ if (streakerID === WAITING) {
+ window.setTimeout(disconnect, 100);
+ } else {
+ streakerClient.unsubscribe(streakerID);
+ streakerID = null;
+ }
+ }
+ }
+
+ return {
+ addSubscriber: function (subscriber) {
+ if (!streakerID) {
+ connect();
+ }
+
+ subscribers[++uid] = subscriber;
+ subscriberCount++;
+
+ return uid;
+ },
+
+ removeSubscriber: function (id) {
+ delete subscribers[id];
+ --subscriberCount;
+
+ if (subscriberCount === 0) {
+ disconnect();
+ }
+ },
+
+ lastUpdate: function () {
+ return lastData || {};
+ }
+ };
+ };
+
+ // expose public-facing functionality
+ bndry.dataSource = dataSource;
+ bndry.dataSource.create = dataSource;
+
+})(bndry, jQuery);
103 example-volume-graph.js
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+window.onload = function () {
+ var subscribeBtn = document.getElementById('subscribe'),
+ unsubscribeBtn = document.getElementById('unsubscribe'),
+ canvas = document.getElementById('graph');
+
+ var volumeData = bndry.dataSource('volume_1s', 1000),
+ subscription = null;
+
+ function subscribe() {
+ subscription = volumeData.addSubscriber(graph);
+ subscribeBtn.disabled = true;
+ unsubscribeBtn.disabled = false;
+ }
+
+ function unsubscribe() {
+ volumeData.removeSubscriber(subscription);
+ subscription = null;
+ subscribeBtn.disabled = false;
+ unsubscribeBtn.disabled = true;
+ }
+
+ subscribeBtn.onclick = subscribe;
+ unsubscribeBtn.onclick = unsubscribe;
+
+ /*
+ The graph object will subscribe to a dataSource. A dataSource subscriber has one required field, update.
+ An optional method, dataProcessor, may be defined to transform the data to be recieved by update before
+ update is called.
+ */
+ var graph = {
+ /*
+ Processes the state field into a more useful form for drawing a bar graph over a time interval.
+ For the volume_1s query, the state key is the timestamp of the sample.
+
+ The callback will return the data to the dataSource for handoff to the update method.
+ */
+ dataProcessor: function (data, callback) {
+ var maxIngressValue = 0,
+ sortedIngressValues = [],
+ sampleRange = 600,
+ currentTime = Math.floor((new Date()).getTime() / 1000) * 1000,
+ timestamp;
+
+ // step over each second backwards, and see if there is an ingress octet value to store
+ for (timestamp = currentTime - (1000 * sampleRange); timestamp < currentTime; timestamp += 1000) {
+ if (data.state[timestamp]) {
+ sortedIngressValues.push(data.state[timestamp].ingressOctetTotalCount);
+ maxIngressValue = Math.max(data.state[timestamp].ingressOctetTotalCount, maxIngressValue);
+ } else {
+ sortedIngressValues.push(0);
+ }
+ }
+
+ // return the processed data to dataSource for handoff to update
+ data = {
+ maxIngressValue: maxIngressValue,
+ times: sortedIngressValues
+ };
+
+ callback(data);
+ },
+
+ /*
+ Called by the dataSource to refresh the graph; note that if we did not define a dataProcessor method to
+ customize our data, data would consist of three fields:
+
+ data.added: items that have been added to the data set since the last update, stored by key; undefined if none
+ data.removed: items that have been removed from the data set since the last update, stored by key; undefined if none
+ data.state: all items currently being reported, stored by key
+
+ Since we have defined a dataProcessor method to smooth out and order our data per second, we have the
+ following fields available:
+
+ data.times: an array of octet values arranged in ascending order, starting with the current second
+ data.maxIngressValue: the maximal ingress octect value in data.items
+ */
+ update: function (data) {
+ var width = canvas.width,
+ height = canvas.height,
+ context = canvas.getContext('2d'),
+ max = data.maxIngressValue,
+ i = 0,
+ samples = data.times.length,
+ lineWidth = width / samples,
+ val;
+
+ context.clearRect(0, 0, width, height);
+ context.fillStyle = '#555';
+
+ // loop over the samples and render them to scale in the graph
+ for (; i < samples; ++i) {
+ val = data.times[i];
+ context.fillRect(width - (i + 1) * lineWidth,
+ height - val * height / max,
+ lineWidth,
+ val * height / max);
+ }
+ }
+ };
+
+ // kick everything off by subscribing the graph to the datasource
+ subscribe();
+};
82 index.html
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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+ <meta http-equiv="Content-type" content="text/html; charset=utf-8">
+ <title>Boundary Data-source Example</title>
+
+ <!-- required third-party libraries -->
+ <script src="lib/jquery-1.6.4.min.js" type="text/javascript"></script>
+ <script src="lib/org/cometd.js" type="text/javascript"></script>
+ <script src="lib/org/cometd/TimeSyncExtension.js" type="text/javascript"></script>
+ <script src="lib/jquery.cometd.js" type="text/javascript"></script>
+ <script src="lib/jquery.cometd-timesync.js" type="text/javascript"></script>
+
+ <!-- Boundary JavaScript API files -->
+ <!-- Don't forget to update the auth.js file with your account info! -->
+ <script src="bndry/auth.js" type="text/javascript"></script>
+ <script src="bndry/data-source.js" type="text/javascript"></script>
+
+ <!-- example code -->
+ <script src="example-volume-graph.js" type="text/javascript"></script>
+
+ <style type="text/css">
+ #container {
+ margin: 20px auto;
+ position: relative;
+ width: 960px;
+ }
+ #container h1 {
+ margin: 0 0 1em;
+ }
+ #container p {
+ margin: 0 0 1.5em;
+ }
+
+ #controls {
+ margin: 1.5em 0;
+ }
+
+ #graph {
+ background: #eee;
+ margin: 0 0 1.5em;
+ }
+ #graph canvas {
+ display: block;
+ }
+ </style>
+</head>
+
+<body>
+ <div id="container">
+ <div id="example">
+ <h1>Volume of Ingress Octets per Second</h1>
+
+ <div id="controls">
+ <button id="subscribe" disabled>Subscribe to data-source</button>
+ <button id="unsubscribe" disabled>Unsubscribe from data-source</button>
+ </div>
+
+ <canvas id="graph" width="960" height="40">You must use a browser that <a href="http://www.google.com/chrome">supports the canvas tag</a> to view this example.</canvas>
+ </div>
+
+ <div id="explaination">
+ <p>
+ This is a demonstration of how a Boundary dataSource interacts with a custom visualization. In this example,
+ we are displaying the amount of ingress octets measured per second for the last 600 seconds across all meters
+ in an organization.
+ </p>
+
+ <p>
+ Activating the "unsubscribe" button will cause the graph object to stop recieving updates from it's dataSource.
+ Note that when a dataSource has no subscribers, it will become idle. Activating the "subscribe" button will cause
+ the graph object to start recieving updates again.
+ </p>
+
+ <p>
+ See the <a href="example-volume-graph.js">example-volume-graph.js</a> file for implementations details.
+ </p>
+ </div>
+ </div>
+</body>
+</html>
4 lib/jquery-1.6.4.min.js
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20 lib/jquery.cometd-timesync.js
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2010 the original author or authors.
+ *
+ * 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.
+ */
+
+(function($)
+{
+ $.cometd.registerExtension('timesync', new org.cometd.TimeSyncExtension());
+})(jQuery);
121 lib/jquery.cometd.js
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2010 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+(function($)
+{
+ // Remap cometd JSON functions to jquery JSON functions
+ org.cometd.JSON.toJSON = JSON.stringify;
+ org.cometd.JSON.fromJSON = JSON.parse;
+
+ function _setHeaders(xhr, headers)
+ {
+ if (headers)
+ {
+ for (var headerName in headers)
+ {
+ if (headerName.toLowerCase() === 'content-type')
+ {
+ continue;
+ }
+ xhr.setRequestHeader(headerName, headers[headerName]);
+ }
+ }
+ }
+
+ // Remap toolkit-specific transport calls
+ function LongPollingTransport()
+ {
+ var _super = new org.cometd.LongPollingTransport();
+ var that = org.cometd.Transport.derive(_super);
+
+ that.xhrSend = function(packet)
+ {
+ return $.ajax({
+ url: packet.url,
+ async: packet.sync !== true,
+ type: 'POST',
+ contentType: 'application/json;charset=UTF-8',
+ data: packet.body,
+ xhrFields: {
+ // Has no effect if the request is not cross domain
+ // but if it is, allows cookies to be sent to the server
+ // withCredentials: true
+ },
+ beforeSend: function(xhr)
+ {
+ _setHeaders(xhr, packet.headers);
+ // Returning false will abort the XHR send
+ return true;
+ },
+ success: packet.onSuccess,
+ error: function(xhr, reason, exception)
+ {
+ packet.onError(reason, exception);
+ }
+ });
+ };
+
+ return that;
+ }
+
+ function CallbackPollingTransport()
+ {
+ var _super = new org.cometd.CallbackPollingTransport();
+ var that = org.cometd.Transport.derive(_super);
+
+ that.jsonpSend = function(packet)
+ {
+ $.ajax({
+ url: packet.url,
+ async: packet.sync !== true,
+ type: 'GET',
+ dataType: 'jsonp',
+ jsonp: 'jsonp',
+ data: {
+ // In callback-polling, the content must be sent via the 'message' parameter
+ message: packet.body
+ },
+ beforeSend: function(xhr)
+ {
+ _setHeaders(xhr, packet.headers);
+ // Returning false will abort the XHR send
+ return true;
+ },
+ success: packet.onSuccess,
+ error: function(xhr, reason, exception)
+ {
+ packet.onError(reason, exception);
+ }
+ });
+ };
+
+ return that;
+ }
+
+ $.Cometd = function(name)
+ {
+ var cometd = new org.cometd.Cometd(name);
+
+ cometd.registerTransport('long-polling', new LongPollingTransport());
+ cometd.registerTransport('callback-polling', new CallbackPollingTransport());
+
+ return cometd;
+ };
+
+ // The default cometd instance
+ $.cometd = new $.Cometd();
+
+})(jQuery);
2,840 lib/org/cometd.js
2,840 additions, 0 deletions not shown because the diff is too large. Please use a local Git client to view these changes.
197 lib/org/cometd/TimeSyncExtension.js
@@ -0,0 +1,197 @@
+/**
+ * Dual licensed under the Apache License 2.0 and the MIT license.
+ * $Revision: 1586 $ $Date: 2010-12-22 15:36:07 +0100 (Wed, 22 Dec 2010) $
+ */
+
+if (typeof dojo != "undefined")
+{
+ dojo.provide("org.cometd.TimeSyncExtension");
+}
+
+/**
+ *
+ * With each handshake or connect, the extension sends timestamps within the
+ * ext field like: <code>{ext:{timesync:{tc:12345567890,l:23,o:4567},...},...}</code>
+ * where:<ul>
+ * <li>tc is the client timestamp in ms since 1970 of when the message was sent.
+ * <li>l is the network lag that the client has calculated.
+ * <li>o is the clock offset that the client has calculated.
+ * </ul>
+ *
+ * <p>
+ * A cometd server that supports timesync, can respond with an ext
+ * field like: <code>{ext:{timesync:{tc:12345567890,ts:1234567900,p:123,a:3},...},...}</code>
+ * where:<ul>
+ * <li>tc is the client timestamp of when the message was sent,
+ * <li>ts is the server timestamp of when the message was received
+ * <li>p is the poll duration in ms - ie the time the server took before sending the response.
+ * <li>a is the measured accuracy of the calculated offset and lag sent by the client
+ * </ul>
+ *
+ * <p>
+ * The relationship between tc, ts & l is given by <code>ts=tc+o+l</code> (the
+ * time the server received the messsage is the client time plus the offset plus the
+ * network lag). Thus the accuracy of the o and l settings can be determined with
+ * <code>a=(tc+o+l)-ts</code>.
+ * </p>
+ * <p>
+ * When the client has received the response, it can make a more accurate estimate
+ * of the lag as <code>l2=(now-tc-p)/2</code> (assuming symmetric lag).
+ * A new offset can then be calculated with the relationship on the client
+ * that <code>ts=tc+o2+l2</code>, thus <code>o2=ts-tc-l2</code>.
+ * </p>
+ * <p>
+ * Since the client also receives the a value calculated on the server, it
+ * should be possible to analyse this and compensate for some asymmetry
+ * in the lag. But the current client does not do this.
+ * </p>
+ *
+ * @param configuration
+ */
+
+org.cometd.TimeSyncExtension = function(configuration)
+{
+ var _cometd;
+ var _maxSamples = configuration && configuration.maxSamples || 10;
+ var _lags = [];
+ var _offsets = [];
+ var _lag = 0;
+ var _offset = 0;
+
+ function _debug(text, args)
+ {
+ _cometd._debug(text, args);
+ }
+
+ this.registered = function(name, cometd)
+ {
+ _cometd = cometd;
+ _debug('TimeSyncExtension: executing registration callback');
+ };
+
+ this.unregistered = function()
+ {
+ _debug('TimeSyncExtension: executing unregistration callback');
+ _cometd = null;
+ _lags = [];
+ _offsets = [];
+ };
+
+ this.incoming = function(message)
+ {
+ var channel = message.channel;
+ if (channel && channel.indexOf('/meta/') === 0)
+ {
+ if (message.ext && message.ext.timesync)
+ {
+ var timesync = message.ext.timesync;
+ _debug('TimeSyncExtension: server sent timesync', timesync);
+
+ var now = new Date().getTime();
+ var l2 = (now - timesync.tc - timesync.p) / 2;
+ var o2 = timesync.ts - timesync.tc - l2;
+
+ _lags.push(l2);
+ _offsets.push(o2);
+ if (_offsets.length > _maxSamples)
+ {
+ _offsets.shift();
+ _lags.shift();
+ }
+
+ var samples = _offsets.length;
+ var lagsSum = 0;
+ var offsetsSum = 0;
+ for (var i = 0; i < samples; ++i)
+ {
+ lagsSum += _lags[i];
+ offsetsSum += _offsets[i];
+ }
+ _lag = parseInt((lagsSum / samples).toFixed());
+ _offset = parseInt((offsetsSum / samples).toFixed());
+ _debug('TimeSyncExtension: network lag', _lag, 'ms, time offset with server', _offset, 'ms', _lag, _offset);
+ }
+ }
+ return message;
+ };
+
+ this.outgoing = function(message)
+ {
+ var channel = message.channel;
+ if (channel && channel.indexOf('/meta/') === 0)
+ {
+ if (!message.ext)
+ {
+ message.ext = {};
+ }
+ message.ext.timesync = {
+ tc: new Date().getTime(),
+ l: _lag,
+ o: _offset
+ };
+ _debug('TimeSyncExtension: client sending timesync', org.cometd.JSON.toJSON(message.ext.timesync));
+ }
+ return message;
+ };
+
+ /**
+ * Get the estimated offset in ms from the clients clock to the
+ * servers clock. The server time is the client time plus the offset.
+ */
+ this.getTimeOffset = function()
+ {
+ return _offset;
+ };
+
+ /**
+ * Get an array of multiple offset samples used to calculate
+ * the offset.
+ */
+ this.getTimeOffsetSamples = function()
+ {
+ return _offsets;
+ };
+
+ /**
+ * Get the estimated network lag in ms from the client to the server.
+ */
+ this.getNetworkLag = function()
+ {
+ return _lag;
+ };
+
+ /**
+ * Get the estimated server time in ms since the epoch.
+ */
+ this.getServerTime = function()
+ {
+ return new Date().getTime() + _offset;
+ };
+
+ /**
+ *
+ * Get the estimated server time as a Date object
+ */
+ this.getServerDate = function()
+ {
+ return new Date(this.getServerTime());
+ };
+
+ /**
+ * Set a timeout to expire at given time on the server.
+ * @param callback The function to call when the timer expires
+ * @param atServerTimeOrDate a js Time or Date object representing the
+ * server time at which the timeout should expire
+ */
+ this.setTimeout = function(callback, atServerTimeOrDate)
+ {
+ var ts = (atServerTimeOrDate instanceof Date) ? atServerTimeOrDate.getTime() : (0 + atServerTimeOrDate);
+ var tc = ts - _offset;
+ var interval = tc - new Date().getTime();
+ if (interval <= 0)
+ {
+ interval = 1;
+ }
+ return org.cometd.Utils.setTimeout(_cometd, callback, interval);
+ };
+};

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