/[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 61 - (show annotations)
Thu Apr 17 20:03:54 2008 UTC (15 years, 11 months ago) by andrew.betts
File MIME type: application/javascript
File size: 9815 byte(s)
Fixed: disconnect() behaviour
Fixed: Stream.html sometimes threw an error in Firefox after the frame had been rmeoved by the parent

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

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