web/xynt-streaming.js

   1 // old targetpage == page and moved into start method
   2
   3 //
   4 // CLASS transport_xhr
   5 //
   6 function transport_xhr(doc, xynt_streaming, page)
   7 {
   8     this.doc = doc;
   9     this.xynt_streaming = xynt_streaming;
  10     this.xhr = createXMLHttpRequest();
  11     this.xhr.open('GET', page);
  12
  13     var self = this;
  14     this.xhr.onreadystatechange = function () { self.xhr_cb(); };
  15     this.xhr.send(null);
  16
  17     this.stopped = false;
  18 }
  19
  20 transport_xhr.prototype = {
  21     doc: null,
  22     xynt_streaming: "ready",
  23     xhr: null,
  24     stopped: true,
  25
  26     ctx_old: "",
  27     ctx_old_len: 0,
  28     ctx_new: null,
  29
  30     // script_clean: 0,
  31
  32     destroy: function () { /* public */
  33         if (this.xhr != null) {
  34             this.xhr_abort();
  35         }
  36         delete this.xhr;
  37     },
  38
  39     xhr_cb: function () {
  40         var ret;
  41
  42         if (this.xhr.readyState == 4) {
  43             // console.log("SS: "+safestatus(xhr));
  44
  45             // NOTE: delay management later
  46             // try {
  47             //     if ((ret = safestatus(this.xhr)) == 200) {
  48             //         this.delay = 0;
  49             //         // console.log("del a null "+this.delayed);
  50             //     } else if (ret != -1) {
  51             //         this.delay = 5000;
  52             //         this.hbit('X');
  53             //         // alert('There was a problem with the request.' + ret);
  54             //     }
  55             // } catch(b) {};
  56
  57             // this.delayed = null;
  58             this.stopped = true;
  59         }
  60     },
  61
  62     xhr_abort: function() {
  63         if (this.xhr != null) {
  64             this.xhr.abort();
  65         }
  66     },
  67
  68     xstr_is_init: function () { /* public */
  69         try {
  70             if (this.xhr.responseText != null) {
  71                 this.ctx_new = this.xhr.responseText;
  72             }
  73         }
  74         catch (e) {
  75         }
  76
  77         return (this.ctx_new != null);
  78     },
  79
  80     /* only after a successfull is_initialized call */
  81     xstr_is_ready: function () { /* public */
  82         return (this.xynt_streaming == "ready");
  83     },
  84
  85     xstr_set: function () { /* public */
  86         // already set
  87     },
  88
  89     ctx_new_is_set: function () { /* public */
  90         return (this.ctx_new != null);
  91     },
  92
  93     ctx_new_curlen_get: function () { /* public */
  94         return (this.ctx_new.length);
  95     },
  96
  97     ctx_new_getchar: function(idx) { /* public */
  98         return (this.ctx_new[idx]);
  99     },
 100
 101     ctx_old_len_is_set: function () { /* public */
 102         return (true);
 103     },
 104
 105     ctx_old_len_get: function () { /* public */
 106         return (this.ctx_old_len);
 107     },
 108
 109     ctx_old_len_set: function (len) { /* public */
 110         this.ctx_old_len = len;
 111     },
 112
 113     ctx_old_len_add: function (len) { /* public */
 114         this.ctx_old_len += len;
 115     },
 116
 117     new_part: function () { /* public */
 118         return (this.ctx_new.substr(this.ctx_old_len));
 119     },
 120
 121     scrcls_set: function (step) { /* public */
 122         // this.script_clean = step;
 123     },
 124
 125     postproc: function () {
 126         if (this.stopped && !this.xstr_is_ready()) {
 127             this.xynt_streaming.reload();
 128         }
 129     }
 130 }
 131
 132 //
 133 // CLASS transport_htmlfile
 134 //
 135 function transport_htmlfile(doc, xynt_streaming, page)
 136 {
 137     this.doc = doc;
 138     this.xynt_streaming = xynt_streaming;
 139     this.transfdoc = new ActiveXObject("htmlfile");
 140     this.transfdoc.open();
 141     this.transfdoc.write("<html><body><iframe id='iframe'></iframe></body></html>");
 142     this.transfdoc.close();
 143
 144     this.ifra = this.transfdoc.getElementById("iframe");
 145     this.ifra.contentWindow.location.href = page;
 146     this.stopped = false;
 147 }
 148
 149 transport_htmlfile.prototype = {
 150     doc: null,
 151     xynt_streaming: null,
 152     stopped: true,
 153     ifra: null,
 154     tradoc: null,
 155
 156     destroy: function () { /* public */
 157         if (this.ifra != null) {
 158         //     this.doc.body.removeChild(this.ifra);
 159         //     delete this.ifra;
 160              this.ifra = null;
 161         }
 162
 163         if (this.transfdoc) {
 164             delete this.transfdoc;
 165             this.transfdoc = null;
 166         }
 167     },
 168
 169     xstr_is_init: function () { /* public */
 170         return (typeof(this.ifra.contentWindow.xynt_streaming) != 'undefined');
 171     },
 172
 173     /* only after a successfull is_initialized call */
 174     xstr_is_ready: function () { /* public */
 175         return (this.ifra.contentWindow.xynt_streaming == "ready");
 176     },
 177
 178     /* only after a successfull is_initialized call */
 179     xstr_set: function () { /* public */
 180         if (this.ifra.contentWindow.xynt_streaming == "ready") {
 181             this.ifra.contentWindow.xynt_streaming = this.xynt_streaming;
 182             return (true);
 183         }
 184         else if (this.ifra.contentWindow.xynt_streaming == this.xynt_streaming) {
 185             return (true);
 186         }
 187         else {
 188             return (false);
 189         }
 190     },
 191
 192     ctx_new_is_set: function () { /* public */
 193         return (typeof(this.ifra.contentWindow.ctx_new) != 'undefined');
 194     },
 195
 196     ctx_new_curlen_get: function () { /* public */
 197         return (this.ifra.contentWindow.ctx_new.length);
 198     },
 199
 200     ctx_new_getchar: function(idx) { /* public */
 201     },
 202
 203     ctx_old_len_is_set: function () { /* public */
 204         return (typeof(this.ifra.contentWindow.ctx_old_len) != 'undefined');
 205     },
 206
 207     ctx_old_len_get: function () { /* public */
 208         return (this.ifra.contentWindow.ctx_old_len);
 209     },
 210
 211     ctx_old_len_set: function (len) { /* public */
 212         this.ifra.contentWindow.ctx_old_len = len;
 213     },
 214
 215     ctx_old_len_add: function (len) { /* public */
 216         this.ifra.contentWindow.ctx_old_len += len;
 217     },
 218
 219     new_part: function () { /* public */
 220         return (this.ifra.contentWindow.ctx_new.substr(this.ifra.contentWindow.ctx_old_len));
 221     },
 222
 223     scrcls_set: function (step) { /* public */
 224         this.ifra.contentWindow.script_clean = step;
 225     },
 226
 227     postproc: function () { /* public */
 228         if (this.stopped && !this.xstr_is_ready()) {
 229             this.xynt_streaming.reload();
 230         }
 231     }
 232 }
 233
 234
 235
 236 //
 237 // CLASS transport_iframe
 238 //
 239 function transport_iframe(doc, xynt_streaming, page)
 240 {
 241     this.doc = doc;
 242     this.xynt_streaming = xynt_streaming;
 243     this.ifra = doc.createElement("iframe");
 244     this.ifra.style.visibility = "hidden";
 245     doc.body.appendChild(this.ifra);
 246     this.ifra.contentWindow.location.href = page;
 247     this.stopped = false;
 248 }
 249
 250 transport_iframe.prototype = {
 251     doc: null,
 252     xynt_streaming: null,
 253     stopped: true,
 254     ifra: null,
 255
 256     destroy: function () { /* public */
 257         try {
 258             if (this.ifra != null) {
 259                 // NOTE:  on Opera this remove child crash js if called from
 260                 //        inside of the iframe, on IE on Windows without
 261                 //        it stream abort fails.
 262                 //        the problem is fixed setting into the iframe's onload
 263                 //        function the stopped attribute to true and delegate
 264                 //        postproc() fired by xynt_streaming watchdog()
 265                 this.doc.body.removeChild(this.ifra);
 266                 delete this.ifra;
 267                 this.ifra = null;
 268             }
 269         } catch (b) {
 270             alert("destroy exception catched");
 271         }
 272     },
 273
 274     xstr_is_init: function () { /* public */
 275         return (typeof(this.ifra.contentWindow.xynt_streaming) != 'undefined');
 276     },
 277
 278     /* only after a successfull is_initialized call */
 279     xstr_is_ready: function () { /* public */
 280         return (this.ifra.contentWindow.xynt_streaming == "ready");
 281     },
 282
 283     /* only after a successfull is_initialized call */
 284     xstr_set: function () { /* public */
 285         if (this.ifra.contentWindow.xynt_streaming == "ready") {
 286             this.ifra.contentWindow.xynt_streaming = this.xynt_streaming;
 287             return (true);
 288         }
 289         else if (this.ifra.contentWindow.xynt_streaming == this.xynt_streaming) {
 290             return (true);
 291         }
 292         else {
 293             return (false);
 294         }
 295     },
 296
 297
 298     /* only after a successfull is_ready call to be sure the accessibility of the var */
 299     xstr_set_old: function (xynt_streaming) { /* public */
 300         this.ifra.contentWindow.xynt_streaming = xynt_streaming;
 301     },
 302
 303     ctx_new_is_set: function () { /* public */
 304         return (typeof(this.ifra.contentWindow.ctx_new) != 'undefined');
 305     },
 306
 307     ctx_new_curlen_get: function () { /* public */
 308         return (this.ifra.contentWindow.ctx_new.length);
 309     },
 310
 311     ctx_new_getchar: function(idx) { /* public */
 312     },
 313
 314     ctx_old_len_is_set: function () { /* public */
 315         return (typeof(this.ifra.contentWindow.ctx_old_len) != 'undefined');
 316     },
 317
 318     ctx_old_len_get: function () { /* public */
 319         return (this.ifra.contentWindow.ctx_old_len);
 320     },
 321
 322     ctx_old_len_set: function (len) { /* public */
 323         this.ifra.contentWindow.ctx_old_len = len;
 324     },
 325
 326     ctx_old_len_add: function (len) { /* public */
 327         this.ifra.contentWindow.ctx_old_len += len;
 328     },
 329
 330     new_part: function () { /* public */
 331         return (this.ifra.contentWindow.ctx_new.substr(this.ifra.contentWindow.ctx_old_len));
 332     },
 333
 334     scrcls_set: function (step) { /* public */
 335         this.ifra.contentWindow.script_clean = step;
 336     },
 337
 338     postproc: function () { /* public */
 339         if (this.stopped && !this.xstr_is_ready()) {
 340             this.xynt_streaming.reload();
 341         }
 342     }
 343 }
 344
 345 function xynt_streaming(win, transp_type, console, gst, from, cookiename, sess, sandbox, page, cmdproc)
 346 {
 347     this.win = win;
 348     this.transp_type = transp_type;
 349     this.console = console;
 350     this.gst = gst;
 351     this.from = from;
 352     this.cookiename = cookiename;
 353     this.sess = sess;
 354     this.sandbox = sandbox;
 355     this.page = page;
 356     this.cmdproc = cmdproc;
 357     // this.cmdproc = function(com){/* console.log("COM: "+com); */ eval(com);}
 358     this.doc = win.document;
 359     this.keepalive_old = -1;
 360     this.keepalive_new = -1;
 361 }
 362
 363 xynt_streaming.prototype = {
 364     win:               null,
 365     transp_type:       null,
 366     transp:            null,
 367     console:           null,
 368     gst:               null,
 369     from:              null,
 370     cookiename:        null,
 371     sess:              null,
 372     sandbox:           null,
 373     page:              null,
 374     cmdproc:           null,
 375
 376     start_time:        0,
 377     restart_wait:      5000, // wait restart_wait millisec before begin to check if restart is needed
 378
 379     doc:               null,
 380     cookiepath: "/brisk/",
 381     watchdog_hdl:      null,
 382     hbit:              null,
 383     keepalive_old:    -1,
 384     keepalive_new:    -1,
 385     keepalives_equal:  0,
 386     /* NOTE: right watch_timeout value to 100, for devel reasons use 1000 or more */
 387     /* restart after  4 * 40 * 100 millisec if server ping is missing => 16secs */
 388     keepalives_eq_max: 4,
 389     watchdog_checktm:  40,
 390     watchdog_timeout:  100,
 391     watchdog_ct:       0,
 392     watchable:         false,
 393     restart_n:         0,
 394     comm_match:        /_*@BEGIN@(.*?)@END@/g,
 395     comm_clean:        /_*@BEGIN@(.*?)@END@/,
 396     stream:            "",
 397     the_end:           false,
 398
 399     start: function() { /* public */
 400         if (this.the_end)
 401             return;
 402
 403         createCookie(this.cookiename, sess, 24*365, this.cookiepath);
 404         // alert("start");
 405         this.log("xynt_streaming:start restart: "+this.restart_n);
 406         this.keepalives_equal = 0;
 407
 408         // page arrangement
 409         this.page = url_complete(this.win.location.href, this.page);
 410         // stat, subst, this.gst.st
 411
 412         this.page = url_append_args(this.page, "sess", this.sess, "stat", stat, "subst", subst, "step", this.gst.st, "from", this.from);
 413         this.log(this.page);
 414
 415         // transport instantiation
 416         if (this.transp_type == "xhr") {
 417             this.page = url_append_args(this.page, "transp", "xhr");
 418             this.transp = new transport_xhr(this.doc, this, this.page);
 419         }
 420         else if (this.transp_type == "iframe") {
 421             this.page = url_append_args(this.page, "transp", "iframe");
 422             this.transp = new transport_iframe(this.doc, this, this.page);
 423         }
 424         else if (this.transp_type == "htmlfile") {
 425             this.page = url_append_args(this.page, "transp", "htmlfile");
 426             this.transp = new transport_htmlfile(this.doc, this, this.page);
 427         }
 428         else
 429             return;
 430
 431         // watchdog setting
 432         this.watchdog_ct  = 0;
 433         if (!this.the_end) {
 434             this.watchdog_hdl = setTimeout(function(obj) { obj.log("tout1"); obj.watchdog(); }, this.watchdog_timeout, this);
 435         }
 436
 437         var date = new Date();
 438         this.start_time = date.getTime();
 439     },
 440
 441     stop: function() {
 442         this.the_end = true;
 443         this.abort();
 444     },
 445
 446     hbit_set: function (hbit) {
 447         this.hbit = hbit;
 448     },
 449
 450     watchdog: function () {
 451         // alert("watchdog");
 452         var i, again;
 453         var comm_newpart, comm_len, comm_arr;
 454         var ctx_new_len;
 455
 456         if (this.sandbox != null) {
 457             // 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;
 458             var zug = "WATCHDOG  sess = ["+this.sess+"]  step = "+this.gst.st+" step_loc = "+this.gst.st_loc+" step_loc_new = "+this.gst.st_loc_new;
 459             if (zug != this.sandbox.innerHTML)
 460                 this.sandbox.innerHTML = zug;
 461         }
 462
 463         // WATCHDOGING THE CONNECTION
 464         this.log("hs::watchdog: start, cur equal times: "+this.keepalives_equal);
 465         if (!this.watchable) {
 466             do {
 467                 try{
 468                     // if (typeof(this.ifra.contentWindow.xynt_streaming) == 'undefined')
 469                     if (!this.transp.xstr_is_init()) {
 470                         this.log("hs::watchdog: xstr_is_init = false");
 471                         break;
 472                     }
 473                 }
 474                 catch(b) {
 475                     this.log("hs::watchdog: exception");
 476                     break;
 477                 }
 478
 479                 /*
 480                   on IE7 the the window frame scope is cleaned after the href is set, so we wait
 481                   for a well know variable value before assign this object value to it (OO is a passion)
 482                 */
 483                 // if (this.ifra.contentWindow.xynt_streaming == "ready") {
 484                 if (this.transp.xstr_set()) {
 485                     // this.ifra.contentWindow.xynt_streaming = this;
 486                     this.watchable = true;
 487                     this.watchdog_ct = 0;
 488                     this.log("hs::watchdog: watchable = yes");
 489                 }
 490             } while (false);
 491         }
 492         if ( (this.watchdog_ct % this.watchdog_checktm) == 0) {
 493             this.log("hs::watchdog: this.keepalive_old: "+this.keepalive_old+" this.keepalive_new: "+this.keepalive_new);
 494             if (this.keepalive_old == this.keepalive_new) {
 495                 this.keepalives_equal++;
 496             }
 497             else {
 498                 this.keepalive_old = this.keepalive_new;
 499                 this.keepalives_equal = 0;
 500             }
 501
 502             if (this.keepalives_equal >= this.keepalives_eq_max) {
 503                 this.log("hs::watchdog: MAX ACHIEVED "+this.keepalives_equal);
 504                 this.reload();
 505                 // alert("watchdog return reload");
 506                 return;
 507             }
 508         }
 509
 510         // PICK COMMANDS FROM STREAM
 511         do {
 512             // alert("do--while begin ["+again+"]");
 513             // CHECK: maybe again here isn't needed
 514             again = 0;
 515             try {
 516                 /* if (typeof(this.ifra.contentWindow.ctx_new)     == 'undefined' ||
 517                    typeof(this.ifra.contentWindow.ctx_old_len) == 'undefined') */
 518                 if (!this.transp.ctx_new_is_set() || !this.transp.ctx_old_len_is_set())
 519                     break;
 520             }
 521             catch(b) {
 522                 break;
 523             }
 524
 525             // ctx_new_len = this.ifra.contentWindow.ctx_new.length;
 526             ctx_new_len = this.transp.ctx_new_curlen_get();
 527             // if (ctx_new_len <= this.ifra.contentWindow.ctx_old_len) {
 528             if (ctx_new_len <= this.transp.ctx_old_len_get()) {
 529                 break;
 530             }
 531             this.log("new: "+ ctx_new_len + "  old: "+this.transp.ctx_old_len_get());
 532             this.keepalive_new++;
 533             // alert("pre-loop 1");
 534             for (i = this.transp.ctx_old_len_get() ; i < ctx_new_len ; i++) {
 535                 // if (this.ifra.contentWindow.ctx_new.charAt(i) != '_') {
 536                 if (this.transp.ctx_new_getchar(i) != '_') {
 537                     // this.log("ctx_new.char(i) != '_' ["+this.ifra.contentWindow.ctx_new.charAt(i)+"]");
 538                     break;
 539                 }
 540                 // else {
 541                 //     this.log("ctx_new.charAt(i) == '_'");
 542                 // }
 543             }
 544             // this.ifra.contentWindow.ctx_old_len = i;
 545             this.transp.ctx_old_len_set(i);
 546             if (i == ctx_new_len) {
 547                 this.log("old_len == i");
 548                 break;
 549             }
 550             else {
 551                 this.log("old_len != i: "+i);
 552             }
 553             // alert("do--while middle ["+this.ifra.contentWindow.ctx_old_len+"]");
 554
 555             comm_newpart = this.transp.new_part();
 556             this.log("COM_NEWPART: ["+comm_newpart+"]");
 557             comm_len = 0;
 558             comm_arr = comm_newpart.match(this.comm_match);
 559
 560             // alert("do--while middle2 ["+again+"]");
 561             if (comm_arr) {
 562                 var comm_arr_len = comm_arr.length;
 563                 for (i = 0 ; i < comm_arr_len ; i++) {
 564                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 565                     this.gst.comms = this.gst.comms.concat(temp);
 566                     comm_len += comm_arr[i].length;
 567                 }
 568                 again = 1;
 569             }
 570             // this.ifra.contentWindow.ctx_old_len += comm_len;
 571             this.transp.ctx_old_len_add(comm_len);
 572             // this.ifra.contentWindow.script_clean = this.gst.st;
 573             this.transp.scrcls_set(this.gst.st);
 574             // alert("do--while end ["+again+"]");
 575         } while (again);
 576
 577         // alert("post while");
 578         // EXECUTION OF STREAM COMMANDS
 579         do {
 580             again = 0;
 581             //MOP ?? xhrrestart = 0;
 582             if (this.gst.st_loc < this.gst.st_loc_new) {
 583                 // there is some slow actions running
 584                 break;
 585             }
 586             else if (this.gst.comms.length > 0) {
 587                 var singlecomm;
 588
 589                 singlecomm = this.gst.comms.shift();
 590                 // alert("EXE"+gugu);
 591                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 592                 //xx this.hbit("+");
 593
 594                 // alert("SINGLE: ["+singlecomm+"]");
 595                 this.cmdproc(singlecomm);
 596                 again = 1;
 597             }
 598         } while (again);
 599         this.watchdog_ct++;
 600         if (!this.the_end) {
 601             var date = new Date();
 602             if (date.getTime() > (this.start_time + this.restart_wait)) {
 603                 this.transp.postproc();
 604             }
 605             this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 606         }
 607         // alert("watchdog return normal");
 608
 609         return;
 610     },
 611
 612     //
 613     // moved to xynt-streaming-ifra as push()
 614     //
 615     // keepalive: function (s) {
 616     //     this.log("hs::keepalive");
 617     //     if (s != null) {
 618     //         this.log(s);
 619     //         this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 620     //     }
 621     //     else {
 622     //         this.ifra.contentWindow.ctx_new += "_";
 623     //     }
 624     //     // this.keepalive_new++;
 625     // },
 626
 627     abort: function () { /* public */
 628         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 629
 630         this.gst.abort();
 631         if (this.watchdog_hdl != null) {
 632             clearTimeout(this.watchdog_hdl);
 633             this.watchdog_hdl = null;
 634         }
 635
 636         this.restart_n++;
 637         this.log("hs::reload");
 638         this.watchable = false;
 639         if (this.transp != null) {
 640             this.transp.destroy();
 641             delete this.transp;
 642             this.transp = null;
 643         }
 644     },
 645
 646     reload: function () {
 647         this.abort();
 648         this.start(null);
 649     },
 650
 651     log: function (s) {
 652         if (this.console != null) {
 653             return (this.console.log(s));
 654         }
 655     }
 656 }