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