web/xynt/xynt-http-streaming.js

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