/[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 24 - (show annotations)
Sun May 20 14:19:00 2007 UTC (16 years, 10 months ago) by andrew.betts
File MIME type: application/javascript
File size: 11047 byte(s)
typo

1 // Set domain at highest level
2 var domainparts = document.domain.split(".");
3 document.domain = domainparts[domainparts.length-2]+"."+domainparts[domainparts.length-1];
4
5 Function.prototype.bind = function(obj) {
6 var method = this,
7 temp = function() {
8 return method.apply(obj, arguments);
9 };
10 return temp;
11 }
12 Function.prototype.andThen=function(g) {
13 var f=this;
14 var a=this.arguments
15 return function(args) {
16 f(a);g(args);
17 }
18 };
19
20 function Meteor(instID) {
21
22 this.transferDoc = false;
23 this.pingtimer = false;
24 this.updatepollfreqtimer = false;
25 this.lastrequest = 0;
26 this.recvtimes = [];
27 this.MHostId = false;
28 this.callback_process = function() {};
29 this.callback_reset = function() {};
30 this.callback_eof = function() {};
31 this.callback_changemode = function() {};
32 this.callback_statuschanged = function() {};
33 this.persist = true;
34 this.frameloadtimer = false;
35 this.debugmode = false;
36 this.subsurl = false;
37 this.channels = {};
38 this.channelcount = 0;
39 this.streamreq = false;
40 this.byteoffset = 0;
41
42 // Documented public properties
43 this.subdomain = "data";
44 this.dynamicpageaddress = "push";
45 this.smartpoll = true;
46 this.pollfreq = 2000;
47 this.minpollfreq = 2000;
48 this.mode = "poll";
49 this.polltimeout = 30000;
50 this.pingtimeout = 10000;
51 this.maxmessages = 0;
52 this.status = 0;
53
54 /* Statuses: 0 = Uninitialised,
55 1 = Loading stream,
56 2 = Loading controller frame,
57 3 = Controller frame timeout, retrying.
58 4 = Controller frame loaded and ready
59 5 = Receiving data
60 */
61
62 this.instID = (typeof(instID) != "undefined") ? instID : 0;
63 this.MHostId = Math.floor(Math.random()*100000000)+""+this.instID;
64 }
65
66 Meteor.instances = new Array();
67
68 Meteor.create = function(instID) {
69 if (!instID) instID = Meteor.instances.length;
70 Meteor.instances[instID] = new Meteor(instID);
71 return Meteor.instances[instID];
72 }
73
74 Meteor.register = function(ifr) {
75 instid = new String(ifr.window.frameElement.id);
76 instid = instid.replace(/.*_([0-9]*)$/, "$1");
77 ifr.p = this.instances[instid].process.bind(this.instances[instid]);
78 ifr.r = this.instances[instid].reset.bind(this.instances[instid]);
79 ifr.eof = this.instances[instid].eof.bind(this.instances[instid]);
80 ifr.get = this.instances[instid].get.bind(this.instances[instid]);
81 ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]);
82 clearTimeout(this.instances[instid].frameloadtimer);
83 this.instances[instid].setstatus(4);
84 if (this.debugmode) console.log("Frame registered");
85 }
86
87 Meteor.reset = function(ifr) {
88 instid = new String(ifr.window.frameElement.id);
89 instid = instid.replace(/.*_([0-9]*)$/, "$1");
90 this.instances[instid].reset();
91 }
92
93 Meteor.prototype.joinChannel = function(channelname, backtrack) {
94 if (typeof(this.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
95 this.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
96 if (this.debugmode) console.log("Joined channel "+channelname+", channel list follows");
97 if (this.debugmode) console.log(this.channels);
98 if (this.status != 0) this.start();
99 this.channelcount++;
100 }
101
102 Meteor.prototype.leaveChannel = function(channelname) {
103 if (typeof(this.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
104 delete this.channels[channelname];
105 if (this.status != 0) this.start();
106 this.channelcount--;
107 }
108
109 Meteor.prototype.start = function() {
110 this.persist = (this.maxmessages)?1:0;
111 this.smartpoll = (this.smartpoll)?1:0;
112 this.mode = (this.mode=="stream")?"stream":"poll";
113 if (!this.subdomain || !this.channelcount) throw "Channel or Meteor subdomain host not specified";
114 this.stop();
115 var now = new Date();
116 var t = now.getTime();
117 this.setstatus(1);
118 this.updateSubsUrl();
119 if (this.mode=="stream") {
120 if (document.all) {
121 this.createIframe(this.subsurl);
122 } else {
123 this.createIframe("http://"+this.subdomain+"."+location.hostname+"/stream.html");
124 }
125 var f = this.pollmode.bind(this);
126 clearTimeout(this.pingtimer);
127 this.pingtimer = setTimeout(f, this.pingtimeout);
128
129 } else {
130 this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html?nc="+t);
131 this.recvtimes[0] = t;
132 if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
133 this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
134 }
135 this.lastrequest = t;
136 }
137
138 Meteor.prototype.updateSubsUrl = function() {
139 var surl = "http://" + this.subdomain + "." + location.hostname + "/" + this.dynamicpageaddress + "?id=" + this.MHostId;
140 if (this.maxmessages && this.persist && this.mode != "stream") surl += "&maxmessages=" + this.maxmessages;
141 if (this.mode == "poll" && this.maxmessages == 0 && this.persist==1) this.persist=0;
142 surl += "&persist="+this.persist;
143 for (var c in this.channels) {
144 surl += "&channel="+c;
145 if (this.channels[c].lastmsgreceived > 0) {
146 surl += "&restartfrom="+(this.channels[c].lastmsgreceived+1);
147 } else if (this.channels[c].backtrack > 0) {
148 surl += "&backtrack="+this.channels[c].backtrack;
149 } else if (this.channels[c].backtrack < 0 || isNaN(this.channels[c].backtrack)) {
150 surl += "&restartfrom=";
151 }
152 }
153 this.subsurl = surl;
154 }
155
156 Meteor.prototype.createIframe = function(url) {
157 if (document.all) {
158 this.transferDoc = new ActiveXObject("htmlfile");
159 this.transferDoc.open();
160 this.transferDoc.write("<html>");
161 this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
162 this.transferDoc.write("</html>");
163 this.transferDoc.parentWindow.Meteor = Meteor;
164 this.transferDoc.close();
165 var ifrDiv = this.transferDoc.createElement("div");
166 this.transferDoc.appendChild(ifrDiv);
167 ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
168 } else {
169 var ifr = document.createElement("IFRAME");
170 ifr.style.width = "10px";
171 ifr.style.height = "10px";
172 ifr.style.border = "none";
173 ifr.style.position = "absolute";
174 ifr.style.top = "-10px";
175 ifr.style.marginTop = "-10px";
176 ifr.style.zIndex = "-20";
177 ifr.setAttribute("id", "meteorframe_"+this.instID);
178 ifr.Meteor = Meteor;
179 if (document.compatMode=='CSS1Compat') {
180 var innerifr = document.createElement("IFRAME");
181 innerifr.setAttribute("src", url);
182 innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
183 ifr.appendChild(innerifr);
184 document.body.appendChild(ifr);
185 } else {
186 ifr.setAttribute("src", url);
187 document.body.appendChild(ifr);
188 }
189 }
190 if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
191 var f = this.frameloadtimeout.bind(this);
192 this.frameloadtimer = setTimeout(f, 5000);
193 }
194
195 Meteor.prototype.stop = function() {
196 if (typeof(this.transferDoc)=="object") {
197 this.transferDoc = false;
198 }
199 if (document.getElementById("meteorframe_"+this.instID)) {
200 document.getElementById("meteorframe_"+this.instID).src="about:blank";
201 document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
202 }
203 clearTimeout(this.pingtimer);
204 clearTimeout(this.updatepollfreqtimer);
205 clearTimeout(this.frameloadtimer);
206 this.setstatus(0);
207 }
208
209 Meteor.prototype.pollmode = function() {
210 if (this.debugmode) console.log("Ping timeout");
211 this.mode="poll";
212 this.start();
213 this.callback_changemode("poll");
214 this.lastpingtime = false;
215 }
216
217 Meteor.prototype.process = function(id, channel, data) {
218 if (id == -1) {
219 if (this.debugmode) console.log("Ping");
220 this.ping();
221 } else if (typeof(this.channels[channel]) != "undefined" && id > this.channels[channel].lastmsgreceived) {
222 if (this.debugmode) console.log("Message "+id+" received on channel "+channel+" (last id on channel: "+this.channels[channel].lastmsgreceived+")\n"+data);
223 this.callback_process(data);
224 this.channels[channel].lastmsgreceived = id;
225 if (this.mode=="poll") {
226 var now = new Date();
227 var t = now.getTime();
228 this.recvtimes[this.recvtimes.length] = t;
229 while (this.recvtimes.length > 5) this.recvtimes.shift();
230 }
231 }
232 this.updateSubsUrl();
233 this.setstatus(5);
234 }
235
236 Meteor.prototype.ping = function() {
237 if (this.mode=="stream" && this.pingtimer) {
238 clearTimeout(this.pingtimer);
239 var f = this.pollmode.bind(this);
240 this.pingtimer = setTimeout(f, this.pingtimeout);
241 var now = new Date();
242 this.lastpingtime = now.getTime();
243 }
244 this.setstatus(5);
245 }
246
247 Meteor.prototype.reset = function() {
248 if (this.debugmode) console.log("Stream reset");
249 var now = new Date();
250 var t = now.getTime();
251 var x = this.pollfreq - (t-this.lastrequest);
252 if (x < 10) x = 10;
253 this.ping();
254 this.callback_reset();
255 setTimeout(this.start.bind(this), x);
256 }
257
258 Meteor.prototype.eof = function() {
259 this.callback_eof();
260 }
261
262 Meteor.prototype.get = function(varname) {
263 eval("var a = this."+varname+";");
264 if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
265 return a;
266 }
267
268 Meteor.prototype.increasepolldelay = function() {
269 this.pollfreq *= 2;
270 }
271
272 Meteor.prototype.updatepollfreq = function() {
273 if (this.smartpoll) {
274 var now = new Date();
275 var t = now.getTime();
276 var avg = 0;
277 for (var i=1; i<this.recvtimes.length; i++) {
278 var x = (this.recvtimes[i]-this.recvtimes[i-1]);
279 avg += (x>60000)? 60000 : x;
280 }
281 x = (t-this.recvtimes[this.recvtimes.length-1]);
282 avg += (x>180000)? 180000 : x;
283 avg /= this.recvtimes.length;
284 if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
285 if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
286 }
287 }
288
289 Meteor.prototype.registerEventCallback = function(evt, funcRef) {
290 if (evt=="process") {
291 this.callback_process = (this.callback_process).andThen(funcRef);
292 } else if (evt=="reset") {
293 this.callback_reset = (this.callback_reset).andThen(funcRef);
294 } else if (evt=="eof") {
295 this.callback_eof = (this.callback_eof).andThen(funcRef);
296 } else if (evt=="changemode") {
297 this.callback_changemode = (this.callback_changemode).andThen(funcRef);
298 } else if (evt=="changestatus") {
299 this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
300 }
301 }
302
303 Meteor.prototype.frameloadtimeout = function() {
304 if (this.debugmode) console.log("Frame load timeout");
305 if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
306 this.setstatus(3);
307 setTimeout(this.start.bind(this), 5000);
308 }
309 Meteor.prototype.setstatus = function(newstatus) {
310 if (this.status != newstatus) {
311 this.status = newstatus;
312 this.callback_statuschanged(newstatus);
313 }
314 }
315
316
317 Meteor.createCookie = function(name,value,days) {
318 if (days) {
319 var date = new Date();
320 date.setTime(date.getTime()+(days*24*60*60*1000));
321 var expires = "; expires="+date.toGMTString();
322 }
323 else var expires = "";
324 document.cookie = name+"="+value+expires+"; path=/";
325 }
326
327 Meteor.readCookie = function(name) {
328 var nameEQ = name + "=";
329 var ca = document.cookie.split(';');
330 for(var i=0;i < ca.length;i++) {
331 var c = ca[i];
332 while (c.charAt(0)==' ') c = c.substring(1,c.length);
333 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
334 }
335 return null;
336 }
337
338 Meteor.eraseCookie = function(name) {
339 createCookie(name,"",-1);
340 }

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