/[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 22 - (show annotations)
Mon May 14 15:32:03 2007 UTC (16 years, 10 months ago) by andrew.betts
File MIME type: application/javascript
File size: 10795 byte(s)
fixed .stop() bug

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 var surl = "http://" + this.subdomain + "." + location.hostname + "/" + this.dynamicpageaddress + "?id=" + this.MHostId;
119 if (this.maxmessages && !this.persist) surl += "&maxmessages=" + this.maxmessages;
120 for (var c in this.channels) {
121 surl += "&channel="+c;
122 if (this.channels[c].lastmsgreceived > 0) {
123 surl += "&restartfrom="+this.channels[c].lastmsgreceived;
124 } else if (this.channels[c].backtrack > 0) {
125 surl += "&backtrack="+this.channels[c].backtrack;
126 } else if (this.channels[c].backtrack < 0 || isNaN(this.channels[c].backtrack)) {
127 surl += "&restartfrom=";
128 }
129 }
130 this.subsurl = surl;
131 if (this.mode=="stream") {
132 if (document.all) {
133 this.createIframe(this.subsurl);
134 } else {
135 this.createIframe("http://"+this.subdomain+"."+location.hostname+"/stream.html");
136 }
137 var f = this.pollmode.bind(this);
138 clearTimeout(this.pingtimer);
139 this.pingtimer = setTimeout(f, this.pingtimeout);
140
141 } else {
142 this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html");
143 this.recvtimes[0] = t;
144 if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
145 this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
146 }
147 this.lastrequest = t;
148 }
149
150 Meteor.prototype.createIframe = function(url) {
151 if (document.all) {
152 this.transferDoc = new ActiveXObject("htmlfile");
153 this.transferDoc.open();
154 this.transferDoc.write("<html>");
155 this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
156 this.transferDoc.write("</html>");
157 this.transferDoc.parentWindow.Meteor = Meteor;
158 this.transferDoc.close();
159 var ifrDiv = this.transferDoc.createElement("div");
160 this.transferDoc.appendChild(ifrDiv);
161 ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
162 } else {
163 var ifr = document.createElement("IFRAME");
164 ifr.style.width = "10px";
165 ifr.style.height = "10px";
166 ifr.style.border = "none";
167 ifr.style.position = "absolute";
168 ifr.style.top = "-10px";
169 ifr.style.marginTop = "-10px";
170 ifr.style.zIndex = "-20";
171 ifr.setAttribute("id", "meteorframe_"+this.instID);
172 ifr.Meteor = Meteor;
173 if (document.compatMode=='CSS1Compat') {
174 var innerifr = document.createElement("IFRAME");
175 innerifr.setAttribute("src", url);
176 innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
177 ifr.appendChild(innerifr);
178 document.body.appendChild(ifr);
179 } else {
180 ifr.setAttribute("src", url);
181 document.body.appendChild(ifr);
182 }
183 }
184 if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
185 var f = this.frameloadtimeout.bind(this);
186 this.frameloadtimer = setTimeout(f, 5000);
187 }
188
189 Meteor.prototype.stop = function() {
190 if (typeof(this.transferDoc)=="object") {
191 this.transferDoc = false;
192 }
193 if (document.getElementById("meteorframe_"+this.instID)) {
194 document.getElementById("meteorframe_"+this.instID).src="about:blank";
195 document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
196 }
197 clearTimeout(this.pingtimer);
198 clearTimeout(this.updatepollfreqtimer);
199 clearTimeout(this.frameloadtimer);
200 this.setstatus(0);
201 }
202
203 Meteor.prototype.pollmode = function() {
204 if (this.debugmode) console.log("Ping timeout");
205 this.mode="poll";
206 this.start();
207 this.callback_changemode("poll");
208 this.lastpingtime = false;
209 }
210
211 Meteor.prototype.process = function(id, channel, data) {
212 if (id == -1) {
213 if (this.debugmode) console.log("Ping");
214 this.ping();
215 } else if (typeof(this.channels[channel]) != "undefined" && id > this.channels[channel].lastmsgreceived) {
216 if (this.debugmode) console.log("Message "+id+" received on channel "+channel+" (last id on channel: "+this.channels[channel].lastmsgreceived+")\n"+data);
217 this.callback_process(data);
218 this.channels[channel].lastmsgreceived = id;
219 if (this.mode=="poll") {
220 var now = new Date();
221 var t = now.getTime();
222 this.recvtimes[this.recvtimes.length] = t;
223 while (this.recvtimes.length > 5) this.recvtimes.shift();
224 }
225 }
226 this.setstatus(5);
227 }
228
229 Meteor.prototype.ping = function() {
230 if (this.mode=="stream" && this.pingtimer) {
231 clearTimeout(this.pingtimer);
232 var f = this.pollmode.bind(this);
233 this.pingtimer = setTimeout(f, this.pingtimeout);
234 var now = new Date();
235 this.lastpingtime = now.getTime();
236 }
237 this.setstatus(5);
238 }
239
240 Meteor.prototype.reset = function() {
241 if (this.debugmode) console.log("Stream reset");
242 var now = new Date();
243 var t = now.getTime();
244 var x = this.pollfreq - (t-this.lastrequest);
245 if (x < 10) x = 10;
246 this.ping();
247 this.callback_reset();
248 setTimeout(this.start.bind(this), x);
249 }
250
251 Meteor.prototype.eof = function() {
252 this.callback_eof();
253 }
254
255 Meteor.prototype.get = function(varname) {
256 eval("var a = this."+varname+";");
257 if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
258 return a;
259 }
260
261 Meteor.prototype.increasepolldelay = function() {
262 this.pollfreq *= 2;
263 }
264
265 Meteor.prototype.updatepollfreq = function() {
266 if (this.smartpoll) {
267 var now = new Date();
268 var t = now.getTime();
269 var avg = 0;
270 for (var i=1; i<this.recvtimes.length; i++) {
271 var x = (this.recvtimes[i]-this.recvtimes[i-1]);
272 avg += (x>60000)? 60000 : x;
273 }
274 x = (t-this.recvtimes[this.recvtimes.length-1]);
275 avg += (x>180000)? 180000 : x;
276 avg /= this.recvtimes.length;
277 if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
278 if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
279 }
280 }
281
282 Meteor.prototype.registerEventCallback = function(evt, funcRef) {
283 if (evt=="process") {
284 this.callback_process = (this.callback_process).andThen(funcRef);
285 } else if (evt=="reset") {
286 this.callback_reset = (this.callback_reset).andThen(funcRef);
287 } else if (evt=="eof") {
288 this.callback_eof = (this.callback_eof).andThen(funcRef);
289 } else if (evt=="changemode") {
290 this.callback_changemode = (this.callback_changemode).andThen(funcRef);
291 } else if (evt=="changestatus") {
292 this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
293 }
294 }
295
296 Meteor.prototype.frameloadtimeout = function() {
297 if (this.debugmode) console.log("Frame load timeout");
298 if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
299 this.setstatus(3);
300 setTimeout(this.start.bind(this), 5000);
301 }
302 Meteor.prototype.setstatus = function(newstatus) {
303 if (this.status != newstatus) {
304 this.status = newstatus;
305 this.callback_statuschanged(newstatus);
306 }
307 }
308
309
310 Meteor.createCookie = function(name,value,days) {
311 if (days) {
312 var date = new Date();
313 date.setTime(date.getTime()+(days*24*60*60*1000));
314 var expires = "; expires="+date.toGMTString();
315 }
316 else var expires = "";
317 document.cookie = name+"="+value+expires+"; path=/";
318 }
319
320 Meteor.readCookie = function(name) {
321 var nameEQ = name + "=";
322 var ca = document.cookie.split(';');
323 for(var i=0;i < ca.length;i++) {
324 var c = ca[i];
325 while (c.charAt(0)==' ') c = c.substring(1,c.length);
326 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
327 }
328 return null;
329 }
330
331 Meteor.eraseCookie = function(name) {
332 createCookie(name,"",-1);
333 }

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