/[meteor]/googlecode.com/svn/trunk/public_html/meteor.js
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /googlecode.com/svn/trunk/public_html/meteor.js

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Revision 64 - (show annotations)
Mon Jan 19 11:19:41 2009 UTC (15 years, 2 months ago) by andrew.betts
File MIME type: application/javascript
File size: 11158 byte(s)
Release 1.06.04 as documented in Google Group

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 pollaborted: false,
31 pollhost: null,
32 pollnum: 0,
33 polltimeout: 30000,
34 polltimer: null,
35 recvtimes: [],
36 lastrequest: null,
37 status: 0,
38 updatepollfreqtimer: null,
39
40 isSupportedBrowser: function() {
41 var v;
42 if (v = navigator.userAgent.match(/compatible\; MSIE\ ([0-9\.]+)\;/i)) {
43 if (parseFloat(v[1]) <= 5.5) return false;
44 } else if (v = navigator.userAgent.match(/Gecko\/([0-9]+)/i)) {
45 if (parseInt(v[1]) <= 20051015) return false;
46 } else if (v = navigator.userAgent.match(/WebKit\/([0-9\.]+)/i)) {
47 if (parseFloat(v[1]) < 400) return false;
48 }
49 return true;
50 },
51
52 register: function(ifr) {
53 ifr.p = Meteor.process;
54 ifr.r = Meteor.reset;
55 ifr.eof = Meteor.eof;
56 ifr.ch = Meteor.channelInfo;
57 clearTimeout(Meteor.frameloadtimer);
58 Meteor.setstatus(4);
59 Meteor.log("Frame registered");
60 },
61
62 joinChannel: function(channelname, backtrack) {
63 if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
64 Meteor.channels[channelname] = {backtrack:backtrack};
65 Meteor.log("Joined channel "+channelname);
66 Meteor.channelcount++;
67 if (Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
68 },
69
70 leaveChannel: function(channelname) {
71 if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
72 delete Meteor.channels[channelname];
73 Meteor.log("Left channel "+channelname);
74 Meteor.channelcount--;
75 if (Meteor.channelcount && Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
76 else Meteor.disconnect();
77 },
78
79 connect: function() {
80 if (!Meteor.host) throw "Meteor host not specified";
81 if (isNaN(Meteor.port)) throw "Meteor port not specified";
82 if (!Meteor.channelcount) throw "No channels specified";
83 if (Meteor.status) Meteor.disconnect();
84 Meteor.log("Connecting");
85 Meteor.setstatus(1);
86 if (!Meteor.hostid) Meteor.hostid = Meteor.time()+""+Math.floor(Math.random()*1000000)
87 document.domain = Meteor.extract_xss_domain(document.domain);
88 if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
89 Meteor.log("Selected "+Meteor.mode+" transport");
90 if (Meteor.mode=="xhrinteractive" || Meteor.mode=="iframe" || Meteor.mode=="serversent") {
91 if (Meteor.mode == "iframe") {
92 Meteor.loadFrame(Meteor.getSubsUrl());
93 } else {
94 Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
95 }
96 clearTimeout(Meteor.pingtimer);
97 Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
98
99 } else {
100 Meteor.recvtimes[0] = Meteor.time();
101 if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
102 if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 10000);
103 if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
104 Meteor.poll();
105 }
106 },
107
108 disconnect: function() {
109 if (Meteor.status) {
110 if (Meteor.status != 6) Meteor.setstatus(0);
111 Meteor.clearpoll();
112 clearTimeout(Meteor.pingtimer);
113 clearTimeout(Meteor.updatepollfreqtimer);
114 clearTimeout(Meteor.frameloadtimer);
115 if (typeof CollectGarbage == 'function') CollectGarbage();
116 Meteor.log("Disconnected");
117 try { Meteor.frameref.parentNode.removeChild(Meteor.frameref); delete Meteor.frameref; return true; } catch(e) { }
118 try { Meteor.frameref.open(); Meteor.frameref.close(); return true; } catch(e) {}
119 }
120 },
121
122 selectStreamTransport: function() {
123 try {
124 var test = ActiveXObject;
125 return "iframe";
126 } catch (e) {}
127 if ((typeof window.addEventStream) == "function") return "iframe";
128 return "xhrinteractive";
129 },
130
131 getSubsUrl: function() {
132 var host = ((Meteor.mode=='simplepoll' || Meteor.mode=='smartpoll' || Meteor.mode=='longpoll') && Meteor.pollhost) ? Meteor.pollhost : Meteor.host;
133 var surl = "http://" + host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
134 for (var c in Meteor.channels) {
135 surl += "/"+c;
136 if (typeof Meteor.channels[c].lastmsgreceived != 'undefined') {
137 surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
138 } else if (Meteor.channels[c].backtrack > 0) {
139 surl += ".b"+Meteor.channels[c].backtrack;
140 } else if (Meteor.channels[c].backtrack != undefined) {
141 surl += ".h";
142 }
143 }
144 surl += "?nc="+Meteor.time();
145 return surl;
146 },
147
148 loadFrame: function(url) {
149 try {
150 if (!Meteor.frameref) {
151 var transferDoc = new ActiveXObject("htmlfile");
152 Meteor.frameref = transferDoc;
153 }
154 Meteor.frameref.open();
155 Meteor.frameref.write("<html><script>");
156 Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
157 Meteor.frameref.write("</"+"script></html>");
158 Meteor.frameref.parentWindow.Meteor = Meteor;
159 Meteor.frameref.close();
160 var ifrDiv = Meteor.frameref.createElement("div");
161 Meteor.frameref.appendChild(ifrDiv);
162 ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
163 } catch (e) {
164 if (!Meteor.frameref) {
165 var ifr = document.createElement("IFRAME");
166 ifr.style.width = "10px";
167 ifr.style.height = "10px";
168 ifr.style.border = "none";
169 ifr.style.position = "absolute";
170 ifr.style.top = "-10px";
171 ifr.style.marginTop = "-10px";
172 ifr.style.zIndex = "-20";
173 ifr.Meteor = Meteor;
174 document.body.appendChild(ifr);
175 Meteor.frameref = ifr;
176 }
177 Meteor.frameref.setAttribute("src", url);
178 }
179 Meteor.log("Loading URL '"+url+"' into frame...");
180 Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
181 },
182
183 pollmode: function() {
184 Meteor.log("Ping timeout");
185 if (Meteor.mode != "smartpoll") {
186 Meteor.mode="smartpoll";
187 Meteor.callbacks["changemode"]("poll");
188 clearTimeout(Meteor.pingtimer);
189 Meteor.lastpingtime = false;
190 }
191 Meteor.connect();
192 },
193
194 process: function(id, channel, data) {
195 if (id == -1) {
196 Meteor.log("Ping");
197 Meteor.ping();
198 } else if (typeof(Meteor.channels[channel]) != "undefined") {
199 Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
200 Meteor.callbacks["process"](data);
201 Meteor.channels[channel].lastmsgreceived = id;
202 if (Meteor.mode=="smartpoll") {
203 Meteor.recvtimes[Meteor.recvtimes.length] = Meteor.time();
204 while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
205 }
206 }
207 Meteor.setstatus(5);
208 },
209
210 ping: function() {
211 if (Meteor.pingtimer) {
212 clearTimeout(Meteor.pingtimer);
213 Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
214 Meteor.lastpingtime = Meteor.time();
215 }
216 Meteor.setstatus(5);
217 },
218
219 reset: function() {
220 if (Meteor.status != 6 && Meteor.status != 0) {
221 Meteor.log("Stream reset");
222 Meteor.ping();
223 Meteor.callbacks["reset"]();
224 var x = Meteor.pollfreq - (Meteor.time()-Meteor.lastrequest);
225 if (x < 10) x = 10;
226 setTimeout(Meteor.connect, x);
227 }
228 },
229
230 eof: function() {
231 Meteor.log("Received end of stream, will not reconnect");
232 Meteor.callbacks["eof"]();
233 Meteor.setstatus(6);
234 Meteor.disconnect();
235 },
236
237 channelInfo: function(channel, id) {
238 Meteor.channels[channel].lastmsgreceived = id;
239 Meteor.log("Received channel info for channel "+channel+": resume from "+id);
240 },
241
242 updatepollfreq: function() {
243 var avg = 0;
244 for (var i=1; i<Meteor.recvtimes.length; i++) {
245 avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
246 }
247 avg += (Meteor.time()-Meteor.recvtimes[Meteor.recvtimes.length-1]);
248 avg /= Meteor.recvtimes.length;
249 var target = avg/2;
250 if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
251 if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
252 },
253
254 registerEventCallback: function(evt, funcRef) {
255 Function.prototype.andThen=function(g) {
256 var f=this;
257 var a=Meteor.arguments
258 return function(args) {
259 f(a);g(args);
260 }
261 };
262 if (typeof Meteor.callbacks[evt] == "function") {
263 Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
264 } else {
265 Meteor.callbacks[evt] = funcRef;
266 }
267 },
268
269 frameloadtimeout: function() {
270 Meteor.log("Frame load timeout");
271 if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
272 Meteor.setstatus(3);
273 Meteor.pollmode();
274 },
275
276 extract_xss_domain: function(old_domain) {
277 if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
278 domain_pieces = old_domain.split('.');
279 return domain_pieces.slice(-2, domain_pieces.length).join(".");
280 },
281
282 setstatus: function(newstatus) {
283 // Statuses: 0 = Uninitialised,
284 // 1 = Loading stream,
285 // 2 = Loading controller frame,
286 // 3 = Controller frame timeout, retrying.
287 // 4 = Controller frame loaded and ready
288 // 5 = Receiving data
289 // 6 = End of stream, will not reconnect
290
291 if (Meteor.status != newstatus) {
292 Meteor.status = newstatus;
293 Meteor.callbacks["statuschanged"](newstatus);
294 }
295 },
296
297 log: function(logstr) {
298 if (Meteor.debugmode) {
299 if (window.console) {
300 window.console.log(logstr);
301 } else if (document.getElementById("meteorlogoutput")) {
302 document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
303 }
304 }
305 },
306
307 poll: function() {
308 Meteor.pollaborted = 0;
309 try {
310 clearTimeout(Meteor.polltimer);
311 } catch (e) {};
312 Meteor.lastrequest = Meteor.time();
313 if (Meteor.polltimeout) Meteor.polltimer = setTimeout(Meteor.clearpoll, Meteor.polltimeout);
314 var scripttag = document.createElement("SCRIPT");
315 scripttag.type = "text/javascript";
316 scripttag.src = Meteor.getSubsUrl();
317 scripttag.id = "meteorpoll"+(++Meteor.pollnum);
318 scripttag.className = "meteorpoll";
319 document.getElementsByTagName("HEAD")[0].appendChild(scripttag);
320 },
321
322 clearpoll: function() {
323 if (document.getElementById('meteorpoll'+Meteor.pollnum)) {
324 var s = document.getElementById('meteorpoll'+Meteor.pollnum);
325 s.parentNode.removeChild(s);
326 }
327 if (Meteor.status == 5) {
328 var x = parent.Meteor.pollfreq - (Meteor.time()-Meteor.lastrequest);
329 if (x < 10) x = 10;
330 setTimeout(Meteor.poll, x);
331 }
332 },
333
334 time: function() {
335 var now = new Date();
336 return now.getTime();
337 }
338 }
339
340 var oldonunload = window.onunload;
341 if (typeof window.onunload != 'function') {
342 window.onunload = Meteor.disconnect;
343 } else {
344 window.onunload = function() {
345 if (oldonunload) oldonunload();
346 Meteor.disconnect();
347 }
348 }

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