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", gst.st);
  78         this.log(this.page);
  79         this.ifra.contentWindow.location.href = this.page;
  80         this.watchdog_ct  = 0;
  81         this.watchdog_hdl = setTimeout(function(obj) { obj.log("tout1"); obj.watchdog(); }, this.watchdog_timeout, this);
  82     },
  83
  84     watchdog: function () {
  85         var i, again;
  86         var comm_newpart, comm_len, comm_arr;
  87
  88         // WATCHDOGING THE CONNECTION
  89         if ( (this.watchdog_ct % this.watchdog_checktm) == 0 || !this.watchable) {
  90             this.log("hs::watchdog: start, cur equal times: "+this.keepalives_equal);
  91             if (!this.watchable) {
  92                 do {
  93                     if (typeof(this.ifra.contentWindow.http_streaming) == 'undefined')
  94                         break;
  95                     /*
  96                       on IE7 the the window frame scope is cleaned after the href is set, so we wait
  97                       for a well know variable value before assign this object value to it (OO is a passion)
  98                     */
  99                     if (this.ifra.contentWindow.http_streaming == "ready") {
 100                         this.ifra.contentWindow.http_streaming = this;
 101                         this.watchable = true;
 102                         this.log("hs::watchdog: watchable = yes");
 103                     }
 104                 } while (false);
 105             }
 106             this.log("hs::watchdog: this.keepalive_old: "+this.keepalive_old+" this.keepalive_new: "+this.keepalive_new);
 107             if (this.keepalive_old == this.keepalive_new) {
 108                 this.keepalives_equal++;
 109             }
 110             else {
 111                 this.keepalive_old = this.keepalive_new;
 112                 this.keepalives_equal = 0;
 113             }
 114
 115             if (this.keepalives_equal > this.keepalives_eq_max) {
 116                 this.log("hs::watchdog: MAX ACHIEVED "+this.keepalives_equal);
 117                 this.reload();
 118                 return;
 119             }
 120         }
 121
 122         // PICK COMMANDS FROM STREAM
 123         do {
 124             // CHECK: maybe again here isn't needed
 125             again = 0;
 126             if (typeof(this.ifra.contentWindow.ctx_new) == 'undefined')
 127                 break;
 128             if (this.ifra.contentWindow.ctx_new.length == this.ctx_old_len) {
 129                 // this.ctx_new = this.ctx_old = "";
 130                 // FIXME find a more robust clean method
 131                 break;
 132             }
 133             this.log("new: "+ this.ifra.contentWindow.ctx_new.length + "  old: "+this.ctx_old_len);
 134             this.keepalive_new++;
 135             for (i = this.ctx_old_len ; i < this.ifra.contentWindow.ctx_new.length ; i++) {
 136                 if (this.ifra.contentWindow.ctx_new[i] != '_')
 137                     break;
 138             }
 139             if (i == this.ifra.contentWindow.ctx_new.length) {
 140                 this.ctx_old_len = i;
 141                 break;
 142             }
 143             comm_newpart = this.ifra.contentWindow.ctx_new.substr(this.ctx_old_len);
 144             comm_len = 0;
 145             comm_arr = comm_newpart.match(this.comm_match);
 146
 147             if (comm_arr) {
 148                 for (i = 0 ; i < comm_arr.length ; i++) {
 149                     var temp = comm_arr[i].replace(this.comm_clean,"$1").split("|");
 150
 151                     this.gst.comms = this.gst.comms.concat(temp);
 152                     // XX alert("COMM_ARR["+i+"]: "+comm_arr[i]+"  LEN:"+comm_arr[i].length);
 153                     comm_len += comm_arr[i].length;
 154                 }
 155                 this.ctx_old += comm_newpart.substr(0,comm_len);
 156                 again = 1;
 157             }
 158             this.ctx_old_len = this.ctx_old.length;
 159         } while (again);
 160
 161
 162
 163         // EXECUTION OF STREAM COMMANDS
 164         do {
 165             again = 0;
 166             //MOP ?? xhrrestart = 0;
 167             if (this.gst.st_loc < this.gst.st_loc_new) {
 168                 // there is some slow actions running
 169                 break;
 170             }
 171             else if (this.gst.comms.length > 0) {
 172                 var singlecomm;
 173
 174                 singlecomm = this.gst.comms.shift();
 175                 // alert("EXE"+gugu);
 176                 // $("xhrdeltalog").innerHTML = "EVALL: "+singlecomm.replace("<", "&lt;", "g"); +"<br>";
 177                 //xx this.hbit("+");
 178
 179                 this.cmdproc(singlecomm);
 180                 again = 1;
 181             }
 182         } while (again);
 183
 184
 185         this.watchdog_ct++;
 186         this.watchdog_hdl = setTimeout(function(obj) { /* obj.log("tout2"); */ obj.watchdog(); }, this.watchdog_timeout, this);
 187         return;
 188     },
 189
 190     keepalive: function (s) {
 191         this.log("hs::keepalive");
 192         if (s != null) {
 193             this.log(s);
 194             this.ifra.contentWindow.ctx_new += "@BEGIN@"+s+"@END@";
 195         }
 196         else {
 197             this.ifra.contentWindow.ctx_new += "_";
 198         }
 199         // this.keepalive_new++;
 200     },
 201
 202     abort: function () {
 203         // this.log("PATH: "+this.ifra.contentWindow.location.protocol + "://" + this.ifra.contentWindow.location.host + "/" + this.ifra.contentWindow.location.pathname);
 204
 205         this.gst.abort();
 206         if (this.watchdog_hdl != null) {
 207             clearTimeout(this.watchdog_hdl);
 208             this.watchdog_hdl = null;
 209         }
 210
 211         this.restart_n++;
 212         this.log("hs::reload");
 213         this.watchable = false;
 214         if (this.ifra != null) {
 215             this.doc.body.removeChild(this.ifra);
 216             delete this.ifra;
 217             this.ifra = null;
 218         }
 219         this.ctx_old = "";
 220         this.ctx_old_len = 0;
 221     },
 222
 223     reload: function () {
 224         this.abort();
 225         this.start(null);
 226     },
 227
 228     log: function (s) {
 229         if (this.console != null) {
 230             return (this.console.log(s));
 231         }
 232     }
 233 }