/[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 19 - (show annotations)
Wed May 2 11:21:14 2007 UTC (16 years, 11 months ago) by andrew.betts
File MIME type: application/javascript
File size: 10548 byte(s)
updated to take account of multi-channel subscriptions

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

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