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:           "",
  64     ctx_old_len:       0,
  65     // ctx_new:           "",
  66     ctx_new_len:       0,
  67     stream:            "",
  68
  69     start: function(page) {
  70         this.log("http_streaming:start restart: "+this.restart_n);
  71         this.keepalives_equal = 0;
  72         this.ifra = this.doc.createElement("iframe");
  73         this.ifra.style.visibility = "hidden";
  74         this.doc.body.appendChild(this.ifra);
  75         if (page != null)
  76             this.page = page;
  77         this.page = url_append_args(this.page, "sess", this.sess, "st", this.gst.st);
  78         this.log(this.page);
  79
  80         // this.log(this.ifra);
  81         this.ifra.contentWindow.location.href = this.page;
  82         this.watchdog_ct  = 0;
  83         this.watchdog_hdl = setTimeout(function(obj) { obj.log("tout1"); obj.watchdog(); }, this.watchdog_timeout, this);
  84     },
  85
  86     watchdog: function () {
  87         var i, again;
  88         var comm_newpart, comm_len, comm_arr;
  89
  90         // WATCHDOGING THE CONNECTION
  91         if ( (this.watchdog_ct % this.watchdog_checktm) == 0 || !this.watchable) {
  92             this.log("hs::watchdog: start, cur equal times: "+this.keepalives_equal);
  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             if (this.ifra.contentWindow.ctx_new.length == this.ctx_old_len) {
 131                 // this.ctx_new = this.ctx_old = "";
 132                 // FIXME find a more robust clean method
 133                 break;
 134             }
 135             this.log("new: "+ this.ifra.contentWindow.ctx_new.length + "  old: "+this.ctx_old_len);
 136             this.keepalive_new++;
 137             for (i = this.ctx_old_len ; i < this.ifra.contentWindow.ctx_new.length ; i++) {
 138                 if (this.ifra.contentWindow.ctx_new[i] != '_')
 139                     break;
 140             }
 141             if (i == this.ifra.contentWindow.ctx_new.length) {
 142                 this.ctx_old_len = i;
 143                 break;
 144             }
 145             comm_newpart = this.ifra.contentWindow.ctx_new.substr(this.ctx_old_len);
 146             comm_len = 0;
 147             comm_arr = comm_newpart.match(this.comm_match);
 148
 149             if (comm_arr) {
 150                 for (i = 0 ; i < comm_arr.length ; i++) {
 151                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 152
 153                     this.gst.comms = this.gst.comms.concat(temp);
 154                     // XX alert("COMM_ARR["+i+"]: "+comm_arr[i]+"  LEN:"+comm_arr[i].length);
 155                     comm_len += comm_arr[i].length;
 156                 }
 157                 this.ctx_old += comm_newpart.substr(0,comm_len);
 158                 again = 1;
 159             }
 160             this.ctx_old_len = this.ctx_old.length;
 161         } while (again);
 162
 163
 164
 165         // EXECUTION OF STREAM COMMANDS
 166         do {
 167             again = 0;
 168             //MOP ?? xhrrestart = 0;
 169             if (this.gst.st_loc < this.gst.st_loc_new) {
 170                 // there is some slow actions running
 171                 break;
 172             }
 173             else if (this.gst.comms.length > 0) {
 174                 var singlecomm;
 175
 176                 singlecomm = this.gst.comms.shift();
 177                 // alert("EXE"+gugu);
 178                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 179                 //xx this.hbit("+");
 180
 181                 this.cmdproc(singlecomm);
 182                 again = 1;
 183             }
 184         } while (again);
 185
 186
 187         this.watchdog_ct++;
 188         this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 189         return;
 190     },
 191
 192     keepalive: function (s) {
 193         this.log("hs::keepalive");
 194         if (s != null) {
 195             this.log(s);
 196             this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 197         }
 198         else {
 199             this.ifra.contentWindow.ctx_new += "_";
 200         }
 201         // this.keepalive_new++;
 202     },
 203
 204     abort: function () {
 205         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 206
 207         this.gst.abort();
 208         if (this.watchdog_hdl != null) {
 209             clearTimeout(this.watchdog_hdl);
 210             this.watchdog_hdl = null;
 211         }
 212
 213         this.restart_n++;
 214         this.log("hs::reload");
 215         this.watchable = false;
 216         if (this.ifra != null) {
 217             this.doc.body.removeChild(this.ifra);
 218             delete this.ifra;
 219             this.ifra = null;
 220         }
 221         this.ctx_old = "";
 222         this.ctx_old_len = 0;
 223     },
 224
 225     reload: function () {
 226         this.abort();
 227         this.start(null);
 228     },
 229
 230     log: function (s) {
 231         if (this.console != null) {
 232             return (this.console.log(s));
 233         }
 234     }
 235 }