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                     if (typeof(this.ifra.contentWindow.http_streaming) == 'undefined')
 105                         break;
 106                     /*
 107                       on IE7 the the window frame scope is cleaned after the href is set, so we wait
 108                       for a well know variable value before assign this object value to it (OO is a passion)
 109                     */
 110                     if (this.ifra.contentWindow.http_streaming == "ready") {
 111                         this.ifra.contentWindow.http_streaming = this;
 112                         this.watchable = true;
 113                         this.log("hs::watchdog: watchable = yes");
 114                     }
 115                 } while (false);
 116             }
 117             this.log("hs::watchdog: this.keepalive_old: "+this.keepalive_old+" this.keepalive_new: "+this.keepalive_new);
 118             if (this.keepalive_old == this.keepalive_new) {
 119                 this.keepalives_equal++;
 120             }
 121             else {
 122                 this.keepalive_old = this.keepalive_new;
 123                 this.keepalives_equal = 0;
 124             }
 125
 126             if (this.keepalives_equal > this.keepalives_eq_max) {
 127                 this.log("hs::watchdog: MAX ACHIEVED "+this.keepalives_equal);
 128                 this.reload();
 129                 // alert("watchdog return reload");
 130                 return;
 131             }
 132         }
 133
 134         // PICK COMMANDS FROM STREAM
 135         do {
 136             // alert("do--while begin ["+again+"]");
 137             // CHECK: maybe again here isn't needed
 138             again = 0;
 139             if (typeof(this.ifra.contentWindow.ctx_new)     == 'undefined' ||
 140                 typeof(this.ifra.contentWindow.ctx_old_len) == 'undefined')
 141                 break;
 142
 143             ctx_new_len = this.ifra.contentWindow.ctx_new.length;
 144             if (ctx_new_len <= this.ifra.contentWindow.ctx_old_len) {
 145                 break;
 146             }
 147             this.log("new: "+ ctx_new_len + "  old: "+this.ifra.contentWindow.ctx_old_len);
 148             this.keepalive_new++;
 149             // alert("pre-loop 1");
 150             for (i = this.ifra.contentWindow.ctx_old_len ; i < ctx_new_len ; i++) {
 151                 if (this.ifra.contentWindow.ctx_new.charAt(i) != '_') {
 152                     // this.log("ctx_new.char(i) != '_' ["+this.ifra.contentWindow.ctx_new.charAt(i)+"]");
 153                     break;
 154                 }
 155                 // else {
 156                 //     this.log("ctx_new.charAt(i) == '_'");
 157                 // }
 158             }
 159             this.ifra.contentWindow.ctx_old_len = i;
 160             if (i == ctx_new_len) {
 161                 this.log("old_len == i");
 162                 break;
 163             }
 164             else {
 165                 this.log("old_len != i: "+i);
 166             }
 167             // alert("do--while middle ["+this.ifra.contentWindow.ctx_old_len+"]");
 168
 169             comm_newpart = this.ifra.contentWindow.ctx_new.substr(this.ifra.contentWindow.ctx_old_len);
 170             this.log("COM_NEWPART: ["+comm_newpart+"]");
 171             comm_len = 0;
 172             comm_arr = comm_newpart.match(this.comm_match);
 173
 174             // alert("do--while middle2 ["+again+"]");
 175             if (comm_arr) {
 176                 var comm_arr_len = comm_arr.length;
 177                 for (i = 0 ; i < comm_arr_len ; i++) {
 178                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 179                     this.gst.comms = this.gst.comms.concat(temp);
 180                     comm_len += comm_arr[i].length;
 181                 }
 182                 again = 1;
 183             }
 184             this.ifra.contentWindow.ctx_old_len += comm_len;
 185             this.ifra.contentWindow.script_clean = this.gst.st;
 186             // alert("do--while end ["+again+"]");
 187         } while (again);
 188
 189         // alert("post while");
 190         // EXECUTION OF STREAM COMMANDS
 191         do {
 192             again = 0;
 193             //MOP ?? xhrrestart = 0;
 194             if (this.gst.st_loc < this.gst.st_loc_new) {
 195                 // there is some slow actions running
 196                 break;
 197             }
 198             else if (this.gst.comms.length > 0) {
 199                 var singlecomm;
 200
 201                 singlecomm = this.gst.comms.shift();
 202                 // alert("EXE"+gugu);
 203                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 204                 //xx this.hbit("+");
 205
 206                 // alert("SINGLE: ["+singlecomm+"]");
 207                 this.cmdproc(singlecomm);
 208                 again = 1;
 209             }
 210         } while (again);
 211         this.watchdog_ct++;
 212         if (!this.the_end) {
 213             this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 214         }
 215         // alert("watchdog return normal");
 216
 217         return;
 218     },
 219
 220     //
 221     // moved to xynt-http-streaming-ifra as push()
 222     //
 223     // keepalive: function (s) {
 224     //     this.log("hs::keepalive");
 225     //     if (s != null) {
 226     //         this.log(s);
 227     //         this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 228     //     }
 229     //     else {
 230     //         this.ifra.contentWindow.ctx_new += "_";
 231     //     }
 232     //     // this.keepalive_new++;
 233     // },
 234
 235     abort: function () { /* public */
 236         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 237
 238         this.gst.abort();
 239         if (this.watchdog_hdl != null) {
 240             clearTimeout(this.watchdog_hdl);
 241             this.watchdog_hdl = null;
 242         }
 243
 244         this.restart_n++;
 245         this.log("hs::reload");
 246         this.watchable = false;
 247         if (this.ifra != null) {
 248             this.doc.body.removeChild(this.ifra);
 249             delete this.ifra;
 250             this.ifra = null;
 251         }
 252     },
 253
 254     reload: function () {
 255         this.abort();
 256         this.start(null);
 257     },
 258
 259     log: function (s) {
 260         if (this.console != null) {
 261             return (this.console.log(s));
 262         }
 263     }
 264 }