web/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: 3,
  41     /* NOTE: right watch_timeout value to 100, for devel reasons use 1000 or more */
  42     // FIXME watchdog_timeout:  200,
  43     watchdog_timeout:  200,
  44     watchdog_ct:       0,
  45     watchdog_checktm:  20,
  46     watchable:         false,
  47     restart_n:         0,
  48     comm_match:        /_*@BEGIN@(.*?)@END@/g,
  49     comm_clean:        /_*@BEGIN@(.*?)@END@/,
  50     stream:            "",
  51     the_end:           false,
  52
  53     start: function() { /* public */
  54         if (this.the_end)
  55             return;
  56
  57         createCookie(this.cookiename, sess, 24*365, this.cookiepath);
  58         // alert("start");
  59         this.log("http_streaming:start restart: "+this.restart_n);
  60         this.keepalives_equal = 0;
  61         this.ifra = this.doc.createElement("iframe");
  62         this.ifra.style.visibility = "hidden";
  63         this.doc.body.appendChild(this.ifra);
  64         this.page = url_complete(this.win.location.href, this.page);
  65         // stat, subst, this.gst.st
  66
  67         this.page = url_append_args(this.page, "sess", this.sess, "stat", stat, "subst", subst, "step", this.gst.st, "from", this.from);
  68         // alert(this.page);
  69         this.log(this.page);
  70
  71         // this.log(this.ifra);
  72         this.ifra.contentWindow.location.href = this.page;
  73         // this.ifra.src = this.page;
  74         this.watchdog_ct  = 0;
  75         if (!this.the_end) {
  76             this.watchdog_hdl = setTimeout(function(obj) { obj.log("tout1"); obj.watchdog(); }, this.watchdog_timeout, this);
  77         }
  78     },
  79
  80     stop: function() {
  81         this.the_end = true;
  82         this.abort();
  83     },
  84
  85     hbit_set: function (hbit) {
  86         this.hbit = hbit;
  87     },
  88
  89     watchdog: function () {
  90         // alert("watchdog");
  91         var i, again;
  92         var comm_newpart, comm_len, comm_arr;
  93         var ctx_new_len;
  94
  95         if (this.sandbox != null) {
  96             // 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;
  97             var zug = "WATCHDOG  sess = ["+this.sess+"]  step = "+this.gst.st+" step_loc = "+this.gst.st_loc+" step_loc_new = "+this.gst.st_loc_new;
  98             if (zug != this.sandbox.innerHTML)
  99                 this.sandbox.innerHTML = zug;
 100         }
 101
 102         // WATCHDOGING THE CONNECTION
 103         this.log("hs::watchdog: start, cur equal times: "+this.keepalives_equal);
 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.watchdog_ct = 0;
 122                     this.log("hs::watchdog: watchable = yes");
 123                 }
 124             } while (false);
 125         }
 126         if ( (this.watchdog_ct % this.watchdog_checktm) == 0) {
 127             this.log("hs::watchdog: this.keepalive_old: "+this.keepalive_old+" this.keepalive_new: "+this.keepalive_new);
 128             if (this.keepalive_old == this.keepalive_new) {
 129                 this.keepalives_equal++;
 130             }
 131             else {
 132                 this.keepalive_old = this.keepalive_new;
 133                 this.keepalives_equal = 0;
 134             }
 135
 136             if (this.keepalives_equal > this.keepalives_eq_max) {
 137                 this.log("hs::watchdog: MAX ACHIEVED "+this.keepalives_equal);
 138                 this.reload();
 139                 // alert("watchdog return reload");
 140                 return;
 141             }
 142         }
 143
 144         // PICK COMMANDS FROM STREAM
 145         do {
 146             // alert("do--while begin ["+again+"]");
 147             // CHECK: maybe again here isn't needed
 148             again = 0;
 149             try {
 150                 if (typeof(this.ifra.contentWindow.ctx_new)     == 'undefined' ||
 151                     typeof(this.ifra.contentWindow.ctx_old_len) == 'undefined')
 152                     break;
 153             }
 154             catch(b) {
 155                 break;
 156             }
 157
 158             ctx_new_len = this.ifra.contentWindow.ctx_new.length;
 159             if (ctx_new_len <= this.ifra.contentWindow.ctx_old_len) {
 160                 break;
 161             }
 162             this.log("new: "+ ctx_new_len + "  old: "+this.ifra.contentWindow.ctx_old_len);
 163             this.keepalive_new++;
 164             // alert("pre-loop 1");
 165             for (i = this.ifra.contentWindow.ctx_old_len ; i < ctx_new_len ; i++) {
 166                 if (this.ifra.contentWindow.ctx_new.charAt(i) != '_') {
 167                     // this.log("ctx_new.char(i) != '_' ["+this.ifra.contentWindow.ctx_new.charAt(i)+"]");
 168                     break;
 169                 }
 170                 // else {
 171                 //     this.log("ctx_new.charAt(i) == '_'");
 172                 // }
 173             }
 174             this.ifra.contentWindow.ctx_old_len = i;
 175             if (i == ctx_new_len) {
 176                 this.log("old_len == i");
 177                 break;
 178             }
 179             else {
 180                 this.log("old_len != i: "+i);
 181             }
 182             // alert("do--while middle ["+this.ifra.contentWindow.ctx_old_len+"]");
 183
 184             comm_newpart = this.ifra.contentWindow.ctx_new.substr(this.ifra.contentWindow.ctx_old_len);
 185             this.log("COM_NEWPART: ["+comm_newpart+"]");
 186             comm_len = 0;
 187             comm_arr = comm_newpart.match(this.comm_match);
 188
 189             // alert("do--while middle2 ["+again+"]");
 190             if (comm_arr) {
 191                 var comm_arr_len = comm_arr.length;
 192                 for (i = 0 ; i < comm_arr_len ; i++) {
 193                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 194                     this.gst.comms = this.gst.comms.concat(temp);
 195                     comm_len += comm_arr[i].length;
 196                 }
 197                 again = 1;
 198             }
 199             this.ifra.contentWindow.ctx_old_len += comm_len;
 200             this.ifra.contentWindow.script_clean = this.gst.st;
 201             // alert("do--while end ["+again+"]");
 202         } while (again);
 203
 204         // alert("post while");
 205         // EXECUTION OF STREAM COMMANDS
 206         do {
 207             again = 0;
 208             //MOP ?? xhrrestart = 0;
 209             if (this.gst.st_loc < this.gst.st_loc_new) {
 210                 // there is some slow actions running
 211                 break;
 212             }
 213             else if (this.gst.comms.length > 0) {
 214                 var singlecomm;
 215
 216                 singlecomm = this.gst.comms.shift();
 217                 // alert("EXE"+gugu);
 218                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 219                 //xx this.hbit("+");
 220
 221                 // alert("SINGLE: ["+singlecomm+"]");
 222                 this.cmdproc(singlecomm);
 223                 again = 1;
 224             }
 225         } while (again);
 226         this.watchdog_ct++;
 227         if (!this.the_end) {
 228             this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 229         }
 230         // alert("watchdog return normal");
 231
 232         return;
 233     },
 234
 235     //
 236     // moved to xynt-http-streaming-ifra as push()
 237     //
 238     // keepalive: function (s) {
 239     //     this.log("hs::keepalive");
 240     //     if (s != null) {
 241     //         this.log(s);
 242     //         this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 243     //     }
 244     //     else {
 245     //         this.ifra.contentWindow.ctx_new += "_";
 246     //     }
 247     //     // this.keepalive_new++;
 248     // },
 249
 250     abort: function () { /* public */
 251         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 252
 253         this.gst.abort();
 254         if (this.watchdog_hdl != null) {
 255             clearTimeout(this.watchdog_hdl);
 256             this.watchdog_hdl = null;
 257         }
 258
 259         this.restart_n++;
 260         this.log("hs::reload");
 261         this.watchable = false;
 262         if (this.ifra != null) {
 263             this.doc.body.removeChild(this.ifra);
 264             delete this.ifra;
 265             this.ifra = null;
 266         }
 267     },
 268
 269     reload: function () {
 270         this.abort();
 271         this.start(null);
 272     },
 273
 274     log: function (s) {
 275         if (this.console != null) {
 276             return (this.console.log(s));
 277         }
 278     }
 279 }