xynt-http-streaming.js

   1 // old targetpage == page and moved into start method
   2
   3 function http_streaming(win, console, gst, from, cookiename, sess, sandbox, page, cmdproc)
   4 {
   5     this.win = win;
   6     this.console = console;
   7     this.gst = gst;
   8     this.from = from;
   9     this.cookiename = cookiename;
  10     this.sess = sess;
  11     this.sandbox = sandbox;
  12     this.page = page;
  13     this.cmdproc = cmdproc;
  14     // this.cmdproc = function(com){/* console.log("COM: "+com); */ eval(com);}
  15
  16     this.doc = win.document;
  17     this.keepalive_old = -1;
  18     this.keepalive_new = -1;
  19 }
  20
  21 http_streaming.prototype = {
  22     win:               null,
  23     console:           null,
  24     gst:               null,
  25     from:              null,
  26     cookiename:        null,
  27     sess:              null,
  28     sandbox:           null,
  29     page:              null,
  30     cmdproc:           null,
  31
  32     doc:               null,
  33     ifra:              null,
  34     cookiepath: "/brisk/",
  35     watchdog_hdl:      null,
  36     hbit:              null,
  37     keepalive_old:    -1,
  38     keepalive_new:    -1,
  39     keepalives_equal:  0,
  40     keepalives_eq_max: 6,
  41     /* NOTE: right watch_timeout value to 100, for devel reasons use 1000 or more */
  42     watchdog_timeout:  200,
  43     watchdog_ct:       0,
  44     watchdog_checktm:  20,
  45     watchable:         false,
  46     restart_n:         0,
  47     comm_match:        /_*@BEGIN@(.*?)@END@/g,
  48     comm_clean:        /_*@BEGIN@(.*?)@END@/,
  49     stream:            "",
  50     the_end:           false,
  51
  52     start: function() { /* public */
  53         if (this.the_end)
  54             return;
  55
  56         createCookie(this.cookiename, sess, 24*365, this.cookiepath);
  57         // alert("start");
  58         this.log("http_streaming:start restart: "+this.restart_n);
  59         this.keepalives_equal = 0;
  60         this.ifra = this.doc.createElement("iframe");
  61         this.ifra.style.visibility = "hidden";
  62         this.doc.body.appendChild(this.ifra);
  63         this.page = url_complete(this.win.location.href, this.page);
  64         // stat, subst, this.gst.st
  65
  66         this.page = url_append_args(this.page, "sess", this.sess, "stat", stat, "subst", subst, "step", this.gst.st, "from", this.from);
  67         // alert(this.page);
  68         this.log(this.page);
  69
  70         // this.log(this.ifra);
  71         this.ifra.contentWindow.location.href = this.page;
  72         // this.ifra.src = this.page;
  73         this.watchdog_ct  = 0;
  74         if (!this.the_end) {
  75             this.watchdog_hdl = setTimeout(function(obj) { obj.log("tout1"); obj.watchdog(); }, 0, this);
  76         }
  77     },
  78
  79     stop: function() {
  80         this.the_end = true;
  81         this.abort();
  82     },
  83
  84     hbit_set: function (hbit) {
  85         this.hbit = hbit;
  86     },
  87
  88     watchdog: function () {
  89         // alert("watchdog");
  90         var i, again;
  91         var comm_newpart, comm_len, comm_arr;
  92         var ctx_new_len;
  93
  94         if (this.sandbox != null) {
  95             // from old: var zug = "POLL sess = "+sess+" stat = "+stat+" subst = "+subst+" step = "+this.gst.st+" step_loc = "+this.gst.st_loc+" step_loc_new = "+this.gst.st_loc_new+" STOP: "+this.stopped;
  96             var zug = "WATCHDOG  sess = ["+this.sess+"]  step = "+this.gst.st+" step_loc = "+this.gst.st_loc+" step_loc_new = "+this.gst.st_loc_new;
  97             if (zug != this.sandbox.innerHTML)
  98                 this.sandbox.innerHTML = zug;
  99         }
 100
 101         // WATCHDOGING THE CONNECTION
 102         this.log("hs::watchdog: start, cur equal times: "+this.keepalives_equal);
 103         if ( (this.watchdog_ct % this.watchdog_checktm) == 0 || !this.watchable) {
 104             if (!this.watchable) {
 105                 do {
 106                     try{
 107                         if (typeof(this.ifra.contentWindow.http_streaming) == 'undefined')
 108                             break;
 109                     }
 110                     catch(b) {
 111                         break;
 112                     }
 113
 114                     /*
 115                       on IE7 the the window frame scope is cleaned after the href is set, so we wait
 116                       for a well know variable value before assign this object value to it (OO is a passion)
 117                     */
 118                     if (this.ifra.contentWindow.http_streaming == "ready") {
 119                         this.ifra.contentWindow.http_streaming = this;
 120                         this.watchable = true;
 121                         this.log("hs::watchdog: watchable = yes");
 122                     }
 123                 } while (false);
 124             }
 125             this.log("hs::watchdog: this.keepalive_old: "+this.keepalive_old+" this.keepalive_new: "+this.keepalive_new);
 126             if (this.keepalive_old == this.keepalive_new) {
 127                 this.keepalives_equal++;
 128             }
 129             else {
 130                 this.keepalive_old = this.keepalive_new;
 131                 this.keepalives_equal = 0;
 132             }
 133
 134             if (this.keepalives_equal > this.keepalives_eq_max) {
 135                 this.log("hs::watchdog: MAX ACHIEVED "+this.keepalives_equal);
 136                 this.reload();
 137                 // alert("watchdog return reload");
 138                 return;
 139             }
 140         }
 141
 142         // PICK COMMANDS FROM STREAM
 143         do {
 144             // alert("do--while begin ["+again+"]");
 145             // CHECK: maybe again here isn't needed
 146             again = 0;
 147             try {
 148                 if (typeof(this.ifra.contentWindow.ctx_new)     == 'undefined' ||
 149                     typeof(this.ifra.contentWindow.ctx_old_len) == 'undefined')
 150                     break;
 151             }
 152             catch(b) {
 153                 break;
 154             }
 155
 156             ctx_new_len = this.ifra.contentWindow.ctx_new.length;
 157             if (ctx_new_len <= this.ifra.contentWindow.ctx_old_len) {
 158                 break;
 159             }
 160             this.log("new: "+ ctx_new_len + "  old: "+this.ifra.contentWindow.ctx_old_len);
 161             this.keepalive_new++;
 162             // alert("pre-loop 1");
 163             for (i = this.ifra.contentWindow.ctx_old_len ; i < ctx_new_len ; i++) {
 164                 if (this.ifra.contentWindow.ctx_new.charAt(i) != '_') {
 165                     // this.log("ctx_new.char(i) != '_' ["+this.ifra.contentWindow.ctx_new.charAt(i)+"]");
 166                     break;
 167                 }
 168                 // else {
 169                 //     this.log("ctx_new.charAt(i) == '_'");
 170                 // }
 171             }
 172             this.ifra.contentWindow.ctx_old_len = i;
 173             if (i == ctx_new_len) {
 174                 this.log("old_len == i");
 175                 break;
 176             }
 177             else {
 178                 this.log("old_len != i: "+i);
 179             }
 180             // alert("do--while middle ["+this.ifra.contentWindow.ctx_old_len+"]");
 181
 182             comm_newpart = this.ifra.contentWindow.ctx_new.substr(this.ifra.contentWindow.ctx_old_len);
 183             this.log("COM_NEWPART: ["+comm_newpart+"]");
 184             comm_len = 0;
 185             comm_arr = comm_newpart.match(this.comm_match);
 186
 187             // alert("do--while middle2 ["+again+"]");
 188             if (comm_arr) {
 189                 var comm_arr_len = comm_arr.length;
 190                 for (i = 0 ; i < comm_arr_len ; i++) {
 191                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 192                     this.gst.comms = this.gst.comms.concat(temp);
 193                     comm_len += comm_arr[i].length;
 194                 }
 195                 again = 1;
 196             }
 197             this.ifra.contentWindow.ctx_old_len += comm_len;
 198             this.ifra.contentWindow.script_clean = this.gst.st;
 199             // alert("do--while end ["+again+"]");
 200         } while (again);
 201
 202         // alert("post while");
 203         // EXECUTION OF STREAM COMMANDS
 204         do {
 205             again = 0;
 206             //MOP ?? xhrrestart = 0;
 207             if (this.gst.st_loc < this.gst.st_loc_new) {
 208                 // there is some slow actions running
 209                 break;
 210             }
 211             else if (this.gst.comms.length > 0) {
 212                 var singlecomm;
 213
 214                 singlecomm = this.gst.comms.shift();
 215                 // alert("EXE"+gugu);
 216                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 217                 //xx this.hbit("+");
 218
 219                 // alert("SINGLE: ["+singlecomm+"]");
 220                 this.cmdproc(singlecomm);
 221                 again = 1;
 222             }
 223         } while (again);
 224         this.watchdog_ct++;
 225         if (!this.the_end) {
 226             this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 227         }
 228         // alert("watchdog return normal");
 229
 230         return;
 231     },
 232
 233     //
 234     // moved to xynt-http-streaming-ifra as push()
 235     //
 236     // keepalive: function (s) {
 237     //     this.log("hs::keepalive");
 238     //     if (s != null) {
 239     //         this.log(s);
 240     //         this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 241     //     }
 242     //     else {
 243     //         this.ifra.contentWindow.ctx_new += "_";
 244     //     }
 245     //     // this.keepalive_new++;
 246     // },
 247
 248     abort: function () { /* public */
 249         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 250
 251         this.gst.abort();
 252         if (this.watchdog_hdl != null) {
 253             clearTimeout(this.watchdog_hdl);
 254             this.watchdog_hdl = null;
 255         }
 256
 257         this.restart_n++;
 258         this.log("hs::reload");
 259         this.watchable = false;
 260         if (this.ifra != null) {
 261             this.doc.body.removeChild(this.ifra);
 262             delete this.ifra;
 263             this.ifra = null;
 264         }
 265     },
 266
 267     reload: function () {
 268         this.abort();
 269         this.start(null);
 270     },
 271
 272     log: function (s) {
 273         if (this.console != null) {
 274             return (this.console.log(s));
 275         }
 276     }
 277 }