/[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 39 - (show annotations)
Sat Feb 2 16:49:20 2008 UTC (16 years, 1 month ago) by andrew.betts
File MIME type: application/javascript
File size: 8974 byte(s)
Fixed poll mode problems, frame duplication, removed null byte chars

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

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