/[meteor]/googlecode.com/svn/trunk/public_html/meteor.js
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Contents of /googlecode.com/svn/trunk/public_html/meteor.js

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Revision 53 - (show annotations)
Wed Feb 27 21:58:56 2008 UTC (16 years, 1 month ago) by andrew.betts
File MIME type: application/javascript
File size: 9142 byte(s)
Updated version number

JS client:
Added channel info handler to JS client, assumes Meteor will send <script>ch('channel', msgid);</script>
Allowed processing of messages prior to current message index
Added disconnect() to eof()
Revert to poll mode if unable to load frame (should fix IE proxy issues)

Server:
Fixed output of channel info to show only subscribed channels (and simplified)
Added logging of IP addresses

1 /*
2 stream: xhrinteractive, iframe, serversent
3 longpoll
4 smartpoll
5 simplepoll
6 */
7
8 Meteor = {
9
10 callbacks: {
11 process: function() {},
12 reset: function() {},
13 eof: function() {},
14 statuschanged: function() {},
15 changemode: function() {}
16 },
17 channelcount: 0,
18 channels: {},
19 debugmode: false,
20 frameref: null,
21 host: null,
22 hostid: null,
23 maxpollfreq: 60000,
24 minpollfreq: 2000,
25 mode: "stream",
26 pingtimeout: 20000,
27 pingtimer: null,
28 pollfreq: 3000,
29 port: 80,
30 polltimeout: 30000,
31 recvtimes: [],
32 status: 0,
33 updatepollfreqtimer: null,
34
35 register: function(ifr) {
36 ifr.p = Meteor.process;
37 ifr.r = Meteor.reset;
38 ifr.eof = Meteor.eof;
39 ifr.ch = Meteor.channelInfo;
40 clearTimeout(Meteor.frameloadtimer);
41 Meteor.setstatus(4);
42 Meteor.log("Frame registered");
43 },
44
45 joinChannel: function(channelname, backtrack) {
46 if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
47 Meteor.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
48 Meteor.log("Joined channel "+channelname);
49 Meteor.channelcount++;
50 if (Meteor.status != 0) Meteor.connect();
51 },
52
53 leaveChannel: function(channelname) {
54 if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
55 delete Meteor.channels[channelname];
56 Meteor.log("Left channel "+channelname);
57 if (Meteor.status != 0) Meteor.connect();
58 Meteor.channelcount--;
59 },
60
61 connect: function() {
62 Meteor.log("Connecting");
63 if (!Meteor.host) throw "Meteor host not specified";
64 if (isNaN(Meteor.port)) throw "Meteor port not specified";
65 if (!Meteor.channelcount) throw "No channels specified";
66 if (Meteor.status) Meteor.disconnect();
67 Meteor.setstatus(1);
68 var now = new Date();
69 var t = now.getTime();
70 if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
71 document.domain = Meteor.extract_xss_domain(document.domain);
72 if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
73 Meteor.log("Selected "+Meteor.mode+" transport");
74 if (Meteor.mode=="xhrinteractive" || Meteor.mode=="iframe" || Meteor.mode=="serversent") {
75 if (Meteor.mode == "iframe") {
76 Meteor.loadFrame(Meteor.getSubsUrl());
77 } else {
78 Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
79 }
80 clearTimeout(Meteor.pingtimer);
81 Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
82
83 } else {
84 Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
85 Meteor.recvtimes[0] = t;
86 if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
87 if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 2500);
88 if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
89 }
90 Meteor.lastrequest = t;
91 },
92
93 disconnect: function() {
94 if (Meteor.status) {
95 clearTimeout(Meteor.pingtimer);
96 clearTimeout(Meteor.updatepollfreqtimer);
97 clearTimeout(Meteor.frameloadtimer);
98 if (typeof CollectGarbage == 'function') CollectGarbage();
99 Meteor.setstatus(0);
100 }
101 },
102
103 selectStreamTransport: function() {
104 try {
105 var test = ActiveXObject;
106 return "iframe";
107 } catch (e) {}
108 if ((typeof window.addEventStream) == "function") return "iframe";
109 return "xhrinteractive";
110 },
111
112 getSubsUrl: function() {
113 var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
114 for (var c in Meteor.channels) {
115 surl += "/"+c;
116 if (Meteor.channels[c].lastmsgreceived > 0) {
117 surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
118 } else if (Meteor.channels[c].backtrack > 0) {
119 surl += ".b"+Meteor.channels[c].backtrack;
120 } else if (Meteor.channels[c].backtrack < 0 || isNaN(Meteor.channels[c].backtrack)) {
121 surl += ".h";
122 }
123 }
124 return surl;
125 },
126
127 loadFrame: function(url) {
128 try {
129 if (!Meteor.frameref) {
130 var transferDoc = new ActiveXObject("htmlfile");
131 Meteor.frameref = transferDoc;
132 }
133 Meteor.frameref.open();
134 Meteor.frameref.write("<html><script>");
135 Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
136 Meteor.frameref.write("</"+"script></html>");
137 Meteor.frameref.parentWindow.Meteor = Meteor;
138 Meteor.frameref.close();
139 var ifrDiv = Meteor.frameref.createElement("div");
140 Meteor.frameref.appendChild(ifrDiv);
141 ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
142 } catch (e) {
143 if (!Meteor.frameref) {
144 var ifr = document.createElement("IFRAME");
145 ifr.style.width = "10px";
146 ifr.style.height = "10px";
147 ifr.style.border = "none";
148 ifr.style.position = "absolute";
149 ifr.style.top = "-10px";
150 ifr.style.marginTop = "-10px";
151 ifr.style.zIndex = "-20";
152 ifr.Meteor = Meteor;
153 document.body.appendChild(ifr);
154 Meteor.frameref = ifr;
155 }
156 Meteor.frameref.setAttribute("src", url);
157 }
158 Meteor.log("Loading URL '"+url+"' into frame...");
159 Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
160 },
161
162 pollmode: function() {
163 Meteor.log("Ping timeout");
164 Meteor.mode="smartpoll";
165 clearTimeout(Meteor.pingtimer);
166 Meteor.callbacks["changemode"]("poll");
167 Meteor.lastpingtime = false;
168 Meteor.connect();
169 },
170
171 process: function(id, channel, data) {
172 if (id == -1) {
173 Meteor.log("Ping");
174 Meteor.ping();
175 } else if (typeof(Meteor.channels[channel]) != "undefined") {
176 Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
177 Meteor.callbacks["process"](data);
178 Meteor.channels[channel].lastmsgreceived = id;
179 if (Meteor.mode=="smartpoll") {
180 var now = new Date();
181 Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
182 while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
183 }
184 }
185 Meteor.setstatus(5);
186 },
187
188 ping: function() {
189 if (Meteor.pingtimer) {
190 clearTimeout(Meteor.pingtimer);
191 Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
192 var now = new Date();
193 Meteor.lastpingtime = now.getTime();
194 }
195 Meteor.setstatus(5);
196 },
197
198 reset: function() {
199 Meteor.log("Stream reset");
200 Meteor.ping();
201 Meteor.callbacks["reset"]();
202 var now = new Date();
203 var t = now.getTime();
204 var x = Meteor.pollfreq - (t-Meteor.lastrequest);
205 if (x < 10) x = 10;
206 setTimeout(Meteor.connect, x);
207 },
208
209 eof: function() {
210 Meteor.callbacks["eof"]();
211 Meteor.disconnect();
212 },
213
214 channelInfo: function(channel, id) {
215 Meteor.channels[channel].lastmsgreceived = id;
216 Meteor.log("Received channel info for channel "+channel+": resume from "+id);
217 },
218
219 updatepollfreq: function() {
220 var now = new Date();
221 var t = now.getTime();
222 var avg = 0;
223 for (var i=1; i<Meteor.recvtimes.length; i++) {
224 avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
225 }
226 avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
227 avg /= Meteor.recvtimes.length;
228 var target = avg/2;
229 if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
230 if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
231 },
232
233 registerEventCallback: function(evt, funcRef) {
234 Function.prototype.andThen=function(g) {
235 var f=this;
236 var a=Meteor.arguments
237 return function(args) {
238 f(a);g(args);
239 }
240 };
241 if (typeof Meteor.callbacks[evt] == "function") {
242 Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
243 } else {
244 Meteor.callbacks[evt] = funcRef;
245 }
246 },
247
248 frameloadtimeout: function() {
249 Meteor.log("Frame load timeout");
250 if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
251 Meteor.setstatus(3);
252 Meteor.pollmode();
253 },
254
255 extract_xss_domain: function(old_domain) {
256 if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
257 domain_pieces = old_domain.split('.');
258 return domain_pieces.slice(-2, domain_pieces.length).join(".");
259 },
260
261 setstatus: function(newstatus) {
262 // Statuses: 0 = Uninitialised,
263 // 1 = Loading stream,
264 // 2 = Loading controller frame,
265 // 3 = Controller frame timeout, retrying.
266 // 4 = Controller frame loaded and ready
267 // 5 = Receiving data
268
269 if (Meteor.status != newstatus) {
270 Meteor.status = newstatus;
271 Meteor.callbacks["statuschanged"](newstatus);
272 }
273 },
274
275 log: function(logstr) {
276 if (Meteor.debugmode) {
277 if (window.console) {
278 window.console.log(logstr);
279 } else if (document.getElementById("meteorlogoutput")) {
280 document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
281 }
282 }
283 }
284 }
285
286 var oldonunload = window.onunload;
287 if (typeof window.onunload != 'function') {
288 window.onunload = Meteor.disconnect;
289 } else {
290 window.onunload = function() {
291 if (oldonunload) oldonunload();
292 Meteor.disconnect();
293 }
294 }

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