trunk/public_html/meteor.js

// Set domain at highest level
var domainparts = document.domain.split(".");
document.domain = domainparts[domainparts.length-2]+"."+domainparts[domainparts.length-1];

Function.prototype.bind = function(obj) {
        var method = this,
        temp = function() {
                return method.apply(obj, arguments);
        };
        return temp;
}
Function.prototype.andThen=function(g) {
        var f=this;
        var a=this.arguments
        return function(args) {
                f(a);g(args);
        }
};

function Meteor(instID) {

        this.lastmsgreceived = -1;
        this.transferDoc = false;
        this.pingtimer = false;
        this.updatepollfreqtimer = false;
        this.lastrequest = 0;
        this.recvtimes = new Array();
        this.MHostId = false;
        this.callback_process = function() {};
        this.callback_reset = function() {};
        this.callback_eof = function() {};
        this.callback_changemode = function() {};
        this.callback_statuschanged = function() {};
        this.persist = true;
        this.frameloadtimer = false;
        this.frameurl = false;
        this.debugmode = false;

        // Documented public properties
        this.channel = false;
        this.subdomain = "data";
        this.dynamicpageaddress = "push";
        this.backtrack = 0;
        this.smartpoll = true;
        this.pollfreq = 2000;
        this.minpollfreq = 2000;
        this.mode = "poll";
        this.polltimeout=30000;
        this.maxmessages=0;
        this.pingtimeout = 10000;
        this.status = 0;

        /* Statuses:    0 = Uninitialised,
                                        1 = Loading stream,
                                        2 = Loading controller frame,
                                        3 = Controller frame timeout, retrying.
                                        4 = Controller frame loaded and ready
                                        5 = Receiving data
        */

        this.instID = (typeof(instID) != "undefined") ? instID : 0;
        this.MHostId = Math.floor(Math.random()*100000000)+""+this.instID;
}

Meteor.instances = new Array();

Meteor.create = function(instID) {
        if (!instID) instID = Meteor.instances.length;
        Meteor.instances[instID] = new Meteor(instID);
        return Meteor.instances[instID];
}

Meteor.register = function(ifr) {
        instid = new String(ifr.window.frameElement.id);
        instid = instid.replace(/.*_([0-9]*)$/, "$1");
        ifr.p = this.instances[instid].process.bind(this.instances[instid]);
        ifr.r = this.instances[instid].reset.bind(this.instances[instid]);
        ifr.eof = this.instances[instid].eof.bind(this.instances[instid]);
        ifr.get = this.instances[instid].get.bind(this.instances[instid]);
        ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]);
        clearTimeout(this.instances[instid].frameloadtimer);
        this.instances[instid].setstatus(4);
        if (this.debugmode) console.log("Frame registered");
}

Meteor.prototype.start = function() {
        this.persist = (this.maxmessages)?1:0;
        this.smartpoll = (this.smartpoll)?1:0;
        this.mode = (this.mode=="stream")?"stream":"poll";
        if (!this.subdomain || !this.channel) throw "Channel or Meteor subdomain host not specified";
        this.stop();
        var now = new Date();
        var t = now.getTime();
        this.setstatus(1);
        if (this.mode=="stream") {
                var surl = "http://"+this.subdomain+"."+location.hostname+"/"+this.dynamicpageaddress+"?channel="+this.channel+"&id="+this.MHostId;
                if (this.lastmsgreceived >= 0) {
                        surl += "&restartfrom="+this.lastmsgreceived;
                } else if (this.backtrack > 0) {
                        surl += "&backtrack="+this.backtrack;
                } else if (this.backtrack < 0 || isNaN(this.backtrack)) {
                        surl += "&restartfrom=";
                }
                this.createIframe(surl);
                var f = this.pollmode.bind(this);
                clearTimeout(this.pingtimer);
                this.pingtimer = setTimeout(f, this.pingtimeout);

        } else {
                this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html");
                this.recvtimes[0] = t;
                if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
                this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
        }
        this.lastrequest = t;
}

Meteor.prototype.createIframe = function(url) {
        if (document.all) {
                this.transferDoc = new ActiveXObject("htmlfile");
                this.transferDoc.open();
                this.transferDoc.write("<html>");
                this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
                this.transferDoc.write("</html>");
                var selfref = this;
                this.transferDoc.parentWindow.Meteor = Meteor;
                this.transferDoc.close();
                var ifrDiv = this.transferDoc.createElement("div");
                this.transferDoc.appendChild(ifrDiv);
                ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
        } else {
                var ifr = document.createElement("IFRAME");
                ifr.style.width = "10px";
                ifr.style.height = "10px";
                ifr.style.border = "none";
                ifr.style.position = "absolute";
                ifr.style.top = "-10px";
                ifr.style.marginTop = "-10px";
                ifr.style.zIndex = "-20";
                ifr.setAttribute("id", "meteorframe_"+this.instID);
                ifr.Meteor = Meteor;
                var innerifr = document.createElement("IFRAME");
                innerifr.setAttribute("src", url);
                innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
                ifr.appendChild(innerifr);
                document.body.appendChild(ifr);
        }
        if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
        var f = this.frameloadtimeout.bind(this);
        this.frameloadtimer = setTimeout(f, 5000);
}

Meteor.prototype.stop = function() {
        if (typeof(this.transferDoc)=="object") {
                this.transferDoc = false;
        }
        if (document.getElementById("meteorframe_"+this.instID)) {
                document.getElementById("meteorframe_"+this.instID).src="about:blank";
                document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
        }
        if (!isNaN(this.pingtimer)) clearTimeout(this.pingtimer);
        if (!isNaN(this.updatepollfreqtimer)) clearTimeout(this.updatepollfreqtimer);
        if (!isNaN(this.frameloadtimer)) clearTimeout(this.frameloadtimer);
        this.setstatus(0);
}

Meteor.prototype.pollmode = function() {
        if (this.debugmode) console.log("Ping timeout");
        this.stop();
        this.mode="poll";
        this.start();
        this.callback_changemode("poll");
        this.lastpingtime = false;
}

Meteor.prototype.process = function(id, data, timestamp) {
        if (id > this.lastmsgreceived) {
                this.callback_process(data, timestamp);
                if (id != -1) this.lastmsgreceived = id;
                if (this.mode=="poll") {
                        var now = new Date();
                        var t = now.getTime();
                        this.recvtimes[this.recvtimes.length] = t;
                        while (this.recvtimes.length > 5) this.recvtimes.shift();
                }
        } else if (id == -1) {
                this.ping();
        }
        this.setstatus(5);
}

Meteor.prototype.ping = function() {
        if (this.mode=="stream" && this.pingtimer) {
                clearTimeout(this.pingtimer);
                var f = this.pollmode.bind(this);
                this.pingtimer = setTimeout(f, this.pingtimeout);
                var now = new Date();
                this.lastpingtime = now.getTime();
        }
        this.setstatus(5);
}

Meteor.prototype.reset = function() {
        if (this.debugmode) console.log("Stream reset");
        var now = new Date();
        var t = now.getTime();
        var x = this.pollfreq - (t-this.lastrequest);
        if (x < 10) x = 10;
        this.ping();
        this.callback_reset();
        setTimeout(this.start.bind(this), x);
}

Meteor.prototype.eof = function() {
        this.callback_eof();
}

Meteor.prototype.get = function(varname) {
        eval("var a = this."+varname+";");
        if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
        return a;
}

Meteor.prototype.increasepolldelay = function() {
        this.pollfreq *= 2;
}

Meteor.prototype.updatepollfreq = function() {
        if (this.smartpoll) {
                var now = new Date();
                var t = now.getTime();
                var avg = 0;
                for (var i=1; i<this.recvtimes.length; i++) {
                        var x = (this.recvtimes[i]-this.recvtimes[i-1]);
                        avg += (x>60000)? 60000 : x;
                }
                x = (t-this.recvtimes[this.recvtimes.length-1]);
                avg += (x>180000)? 180000 : x;
                avg /= this.recvtimes.length;
                if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
                if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
        }
}

Meteor.prototype.registerEventCallback = function(evt, funcRef) {
        if (evt=="process") {
                this.callback_process = (this.callback_process).andThen(funcRef);
        } else if (evt=="reset") {
                this.callback_reset = (this.callback_reset).andThen(funcRef);
        } else if (evt=="eof") {
                this.callback_eof = (this.callback_eof).andThen(funcRef);
        } else if (evt=="changemode") {
                this.callback_changemode = (this.callback_changemode).andThen(funcRef);
        } else if (evt=="changestatus") {
                this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
        }
}

Meteor.prototype.frameloadtimeout = function() {
        if (this.debugmode) console.log("Frame load timeout");
        if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
        this.setstatus(3);
        setTimeout(this.start.bind(this), 5000);
}
Meteor.prototype.setstatus = function(newstatus) {
        if (this.status != newstatus) {
                this.status = newstatus;
                this.callback_statuschanged(newstatus);
        }
}

Meteor.createCookie = function(name,value,days) {
        if (days) {
                var date = new Date();
                date.setTime(date.getTime()+(days*24*60*60*1000));
                var expires = "; expires="+date.toGMTString();
        }
        else var expires = "";
        document.cookie = name+"="+value+expires+"; path=/";
}

Meteor.readCookie = function(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for(var i=0;i < ca.length;i++) {
                var c = ca[i];
                while (c.charAt(0)==' ') c = c.substring(1,c.length);
                if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
}

Meteor.eraseCookie = function(name) {
        createCookie(name,"",-1);
}
1	andrew.betts	6	// 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.lastmsgreceived = -1;
23			this.transferDoc = false;
24			this.pingtimer = false;
25			this.updatepollfreqtimer = false;
26			this.lastrequest = 0;
27			this.recvtimes = new Array();
28			this.MHostId = false;
29			this.callback_process = function() {};
30			this.callback_reset = function() {};
31			this.callback_eof = function() {};
32			this.callback_changemode = function() {};
33	andrew.betts	7	this.callback_statuschanged = function() {};
34	andrew.betts	6	this.persist = true;
35	andrew.betts	7	this.frameloadtimer = false;
36			this.frameurl = false;
37	andrew.betts	14	this.debugmode = false;
38	andrew.betts	6
39			// Documented public properties
40			this.channel = false;
41			this.subdomain = "data";
42			this.dynamicpageaddress = "push";
43			this.backtrack = 0;
44			this.smartpoll = true;
45			this.pollfreq = 2000;
46			this.minpollfreq = 2000;
47	andrew.betts	14	this.mode = "poll";
48	andrew.betts	6	this.polltimeout=30000;
49			this.maxmessages=0;
50			this.pingtimeout = 10000;
51	andrew.betts	7	this.status = 0;
52	andrew.betts	6
53	andrew.betts	7	/* Statuses: 0 = Uninitialised,
54			1 = Loading stream,
55			2 = Loading controller frame,
56	andrew.betts	14	3 = Controller frame timeout, retrying.
57	andrew.betts	7	4 = Controller frame loaded and ready
58			5 = Receiving data
59			*/
60
61	andrew.betts	6	this.instID = (typeof(instID) != "undefined") ? instID : 0;
62	andrew.betts	14	this.MHostId = Math.floor(Math.random()*100000000)+""+this.instID;
63	andrew.betts	6	}
64
65			Meteor.instances = new Array();
66
67			Meteor.create = function(instID) {
68	andrew.betts	9	if (!instID) instID = Meteor.instances.length;
69	andrew.betts	6	Meteor.instances[instID] = new Meteor(instID);
70			return Meteor.instances[instID];
71			}
72
73			Meteor.register = function(ifr) {
74			instid = new String(ifr.window.frameElement.id);
75	andrew.betts	14	instid = instid.replace(/._([0-9])$/, "$1");
76	andrew.betts	6	ifr.p = this.instances[instid].process.bind(this.instances[instid]);
77			ifr.r = this.instances[instid].reset.bind(this.instances[instid]);
78			ifr.eof = this.instances[instid].eof.bind(this.instances[instid]);
79			ifr.get = this.instances[instid].get.bind(this.instances[instid]);
80			ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]);
81	andrew.betts	7	clearTimeout(this.instances[instid].frameloadtimer);
82			this.instances[instid].setstatus(4);
83	andrew.betts	14	if (this.debugmode) console.log("Frame registered");
84	andrew.betts	6	}
85
86			Meteor.prototype.start = function() {
87			this.persist = (this.maxmessages)?1:0;
88			this.smartpoll = (this.smartpoll)?1:0;
89			this.mode = (this.mode=="stream")?"stream":"poll";
90			if (!this.subdomain \|\| !this.channel) throw "Channel or Meteor subdomain host not specified";
91	andrew.betts	14	this.stop();
92	andrew.betts	6	var now = new Date();
93			var t = now.getTime();
94	andrew.betts	14	this.setstatus(1);
95	andrew.betts	6	if (this.mode=="stream") {
96	andrew.betts	14	var surl = "http://"+this.subdomain+"."+location.hostname+"/"+this.dynamicpageaddress+"?channel="+this.channel+"&id="+this.MHostId;
97			if (this.lastmsgreceived >= 0) {
98			surl += "&restartfrom="+this.lastmsgreceived;
99			} else if (this.backtrack > 0) {
100			surl += "&backtrack="+this.backtrack;
101			} else if (this.backtrack < 0 \|\| isNaN(this.backtrack)) {
102			surl += "&restartfrom=";
103	andrew.betts	6	}
104	andrew.betts	14	this.createIframe(surl);
105	andrew.betts	6	var f = this.pollmode.bind(this);
106			clearTimeout(this.pingtimer);
107			this.pingtimer = setTimeout(f, this.pingtimeout);
108
109			} else {
110	andrew.betts	14	this.createIframe("http://"+this.subdomain+"."+location.hostname+"/poll.html");
111			this.recvtimes[0] = t;
112			if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer);
113			this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500);
114			}
115			this.lastrequest = t;
116			}
117
118			Meteor.prototype.createIframe = function(url) {
119			if (document.all) {
120			this.transferDoc = new ActiveXObject("htmlfile");
121			this.transferDoc.open();
122			this.transferDoc.write("<html>");
123			this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>");
124			this.transferDoc.write("</html>");
125			var selfref = this;
126			this.transferDoc.parentWindow.Meteor = Meteor;
127			this.transferDoc.close();
128			var ifrDiv = this.transferDoc.createElement("div");
129			this.transferDoc.appendChild(ifrDiv);
130			ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"\" style=\"display: none;\"></iframe>";
131			} else {
132	andrew.betts	6	var ifr = document.createElement("IFRAME");
133			ifr.style.width = "10px";
134			ifr.style.height = "10px";
135			ifr.style.border = "none";
136	andrew.betts	14	ifr.style.position = "absolute";
137			ifr.style.top = "-10px";
138			ifr.style.marginTop = "-10px";
139			ifr.style.zIndex = "-20";
140			ifr.setAttribute("id", "meteorframe_"+this.instID);
141			ifr.Meteor = Meteor;
142			var innerifr = document.createElement("IFRAME");
143			innerifr.setAttribute("src", url);
144			innerifr.setAttribute("id", "meteorinnerframe_"+this.instID);
145			ifr.appendChild(innerifr);
146	andrew.betts	6	document.body.appendChild(ifr);
147			}
148	andrew.betts	14	if (this.debugmode) console.log("Loading URL '"+url+"' into frame...");
149			var f = this.frameloadtimeout.bind(this);
150			this.frameloadtimer = setTimeout(f, 5000);
151	andrew.betts	6	}
152
153	andrew.betts	9	Meteor.prototype.stop = function() {
154			if (typeof(this.transferDoc)=="object") {
155	andrew.betts	14	this.transferDoc = false;
156	andrew.betts	9	}
157			if (document.getElementById("meteorframe_"+this.instID)) {
158			document.getElementById("meteorframe_"+this.instID).src="about:blank";
159			document.body.removeChild(document.getElementById("meteorframe_"+this.instID));
160			}
161			if (!isNaN(this.pingtimer)) clearTimeout(this.pingtimer);
162			if (!isNaN(this.updatepollfreqtimer)) clearTimeout(this.updatepollfreqtimer);
163			if (!isNaN(this.frameloadtimer)) clearTimeout(this.frameloadtimer);
164			this.setstatus(0);
165			}
166
167	andrew.betts	6	Meteor.prototype.pollmode = function() {
168	andrew.betts	14	if (this.debugmode) console.log("Ping timeout");
169			this.stop();
170	andrew.betts	6	this.mode="poll";
171			this.start();
172			this.callback_changemode("poll");
173	andrew.betts	7	this.lastpingtime = false;
174	andrew.betts	6	}
175
176	andrew.betts	14	Meteor.prototype.process = function(id, data, timestamp) {
177	andrew.betts	6	if (id > this.lastmsgreceived) {
178	andrew.betts	14	this.callback_process(data, timestamp);
179	andrew.betts	6	if (id != -1) this.lastmsgreceived = id;
180			if (this.mode=="poll") {
181			var now = new Date();
182			var t = now.getTime();
183			this.recvtimes[this.recvtimes.length] = t;
184			while (this.recvtimes.length > 5) this.recvtimes.shift();
185			}
186			} else if (id == -1) {
187			this.ping();
188			}
189	andrew.betts	7	this.setstatus(5);
190	andrew.betts	6	}
191
192			Meteor.prototype.ping = function() {
193			if (this.mode=="stream" && this.pingtimer) {
194			clearTimeout(this.pingtimer);
195			var f = this.pollmode.bind(this);
196			this.pingtimer = setTimeout(f, this.pingtimeout);
197			var now = new Date();
198			this.lastpingtime = now.getTime();
199			}
200	andrew.betts	7	this.setstatus(5);
201	andrew.betts	6	}
202
203			Meteor.prototype.reset = function() {
204	andrew.betts	14	if (this.debugmode) console.log("Stream reset");
205	andrew.betts	6	var now = new Date();
206			var t = now.getTime();
207			var x = this.pollfreq - (t-this.lastrequest);
208			if (x < 10) x = 10;
209			this.ping();
210			this.callback_reset();
211			setTimeout(this.start.bind(this), x);
212			}
213
214			Meteor.prototype.eof = function() {
215			this.callback_eof();
216			}
217
218			Meteor.prototype.get = function(varname) {
219			eval("var a = this."+varname+";");
220			if (typeof(a) == "undefined") throw "Cannot get value of "+varname;
221			return a;
222			}
223
224			Meteor.prototype.increasepolldelay = function() {
225			this.pollfreq *= 2;
226			}
227
228			Meteor.prototype.updatepollfreq = function() {
229			if (this.smartpoll) {
230			var now = new Date();
231			var t = now.getTime();
232			var avg = 0;
233			for (var i=1; i<this.recvtimes.length; i++) {
234			var x = (this.recvtimes[i]-this.recvtimes[i-1]);
235			avg += (x>60000)? 60000 : x;
236			}
237			x = (t-this.recvtimes[this.recvtimes.length-1]);
238			avg += (x>180000)? 180000 : x;
239			avg /= this.recvtimes.length;
240			if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9);
241			if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05);
242			}
243			}
244
245			Meteor.prototype.registerEventCallback = function(evt, funcRef) {
246			if (evt=="process") {
247			this.callback_process = (this.callback_process).andThen(funcRef);
248			} else if (evt=="reset") {
249			this.callback_reset = (this.callback_reset).andThen(funcRef);
250			} else if (evt=="eof") {
251			this.callback_eof = (this.callback_eof).andThen(funcRef);
252			} else if (evt=="changemode") {
253			this.callback_changemode = (this.callback_changemode).andThen(funcRef);
254	andrew.betts	7	} else if (evt=="changestatus") {
255			this.callback_statuschanged = (this.callback_statuschanged).andThen(funcRef);
256	andrew.betts	6	}
257			}
258
259	andrew.betts	7	Meteor.prototype.frameloadtimeout = function() {
260	andrew.betts	14	if (this.debugmode) console.log("Frame load timeout");
261	andrew.betts	7	if (this.frameloadtimer) clearTimeout(this.frameloadtimer);
262			this.setstatus(3);
263	andrew.betts	14	setTimeout(this.start.bind(this), 5000);
264	andrew.betts	7	}
265			Meteor.prototype.setstatus = function(newstatus) {
266			if (this.status != newstatus) {
267			this.status = newstatus;
268			this.callback_statuschanged(newstatus);
269			}
270			}
271	andrew.betts	6
272			Meteor.createCookie = function(name,value,days) {
273			if (days) {
274			var date = new Date();
275			date.setTime(date.getTime()+(days2460601000));
276			var expires = "; expires="+date.toGMTString();
277			}
278			else var expires = "";
279			document.cookie = name+"="+value+expires+"; path=/";
280			}
281
282			Meteor.readCookie = function(name) {
283			var nameEQ = name + "=";
284			var ca = document.cookie.split(';');
285			for(var i=0;i < ca.length;i++) {
286			var c = ca[i];
287			while (c.charAt(0)==' ') c = c.substring(1,c.length);
288			if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
289			}
290			return null;
291			}
292
293			Meteor.eraseCookie = function(name) {
294			createCookie(name,"",-1);
295	andrew.betts	3	}