renamed check_webservers() to webservers_check()

[brisk.git] / web / index_rd.php

diff --git a/web/index_rd.php b/web/index_rd.php
index d061b0e..2283ec5 100644 (file)
--- a/web/index_rd.php
+++ b/web/index_rd.php
@@ -58,19 +58,18 @@ if (DEBUGGING == "local" && $_SERVER['REMOTE_ADDR'] != '127.0.0.1') {
 
 function shutta()
 {
-  log_rd2("SHUTTA!".connection_status());
+  log_rd2("SHUTTA [".connection_status()."] !");
 }
 
-
 register_shutdown_function(shutta);
 
-function unrecerror()
+function blocking_error($is_unrecoverable)
 {
   GLOBAL $is_page_streaming;
 
   $is_page_streaming = TRUE;
-  log_rd2("UNREC_ERROR:".var_export(debug_backtrace()));
-  return (sprintf('the_end=true; window.onunload = null; window.onbeforeunload = null; document.location.assign("index.php");'));
+  log_rd2("BLOCKING_ERROR UNREC: ".($is_unrecoverable ? "TRUE" : "FALSE"));
+  return (sprintf(($is_unrecoverable ? 'the_end=true; ' : '').'window.onbeforeunload = null; window.onunload = null; document.location.assign("index.php");'));
 }
 
 function page_sync($sess, $page, $table_idx, $table_token)
@@ -109,22 +108,24 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
     //       anche se non ce ne dovrebbe essere mai la necessità
     if (($proxy_step = User::load_step($sess)) == FALSE) {
         log_only2("R");
-        return (FALSE);
+        ignore_user_abort(FALSE);
+        return (blocking_error(TRUE));
     }
     
     // log_rd2("M");
     /* Sync check (read only without modifications */
     ignore_user_abort(TRUE);
     if  ($first_loop == TRUE) {
-        if (($sem = Room::lock_data()) != FALSE) { 
+        if (($sem = Room::lock_data(TRUE)) != FALSE) { 
             // Aggiorna l'expire time lato server
             $S_load_stat['U_first_loop']++;
             if (($user = User::load_data($proxy_step['i'], $sess)) == FALSE) {
-                Room::unlock_data();
+                Room::unlock_data($sem);
                 ignore_user_abort(FALSE);
-                return (unrecerror());
+                return (blocking_error(TRUE));
             }
             $user->lacc = $curtime;
+            // lacc field updated
             User::save_data($user, $user->idx);
             
             if (Room::garbage_time_is_expired($curtime)) {
@@ -132,19 +133,19 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
                 
                 $S_load_stat['R_garbage']++;
                 if (($room = Room::load_data()) == FALSE) {
-                    Room::unlock_data();
+                    Room::unlock_data($sem);
                     ignore_user_abort(FALSE);
-                    return (unrecerror());
+                    return (blocking_error(TRUE));
                 }
                 log_main("pre garbage_manager TRE");
                 $room->garbage_manager(FALSE);
                 Room::save_data($room);
                 unset($room);
             }
-            log_lock("U");
+            log_main("infolock: U");
             Room::unlock_data($sem);
             ignore_user_abort(FALSE);
-        } // if (($sem = Room::lock_data()) != FALSE) { 
+        } // if (($sem = Room::lock_data(TRUE)) != FALSE) { 
         else {
             // wait 20 secs, then restart the xhr 
             ignore_user_abort(FALSE);
@@ -155,7 +156,7 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
     } // if  ($first_loop == TRUE) {
     
     if ($cur_step == $proxy_step['s']) {
-        log_lock("P");
+        log_main("infolock: P");
         return (FALSE);
     }
     else {
@@ -166,10 +167,10 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
     if ($user == FALSE) {
         do {
             ignore_user_abort(TRUE);
-            if (($sem = Room::lock_data()) == FALSE) 
+            if (($sem = Room::lock_data(FALSE)) == FALSE) 
                 break;
             
-            log_lock("P");
+            log_main("infolock: P");
             $S_load_stat['U_heavy']++;
             if (($user = User::load_data($proxy_step['i'], $sess)) == FALSE) {
                 break;
@@ -181,7 +182,7 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
         
         ignore_user_abort(FALSE);
         if ($user == FALSE) {
-            return (unrecerror());
+            return (blocking_error(TRUE));
         }
     }
     
@@ -195,17 +196,23 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
         /*
          *  if $cur_step == -1 load the current state from the main struct
          */
+
+        /* unset the $user var to reload it from main structure */
+        unset($user);
+
         ignore_user_abort(TRUE);
-        $sem = Room::lock_data();
-        $room = Room::load_data();
+        $sem = Room::lock_data(TRUE);
+        if (($room = Room::load_data()) == FALSE) {
+            Room::unlock_data($sem);
+            ignore_user_abort(FALSE);
+            return (blocking_error(TRUE));
+        }
         $S_load_stat['R_minusone']++;
         
-        /* unset the $user var to reload it from main structure */
-        unset($user);
         if (($user = $room->get_user($sess, $idx)) == FALSE) {
             Room::unlock_data($sem);
             ignore_user_abort(FALSE);
-            return (unrecerror());
+            return (blocking_error(TRUE));
         }
         
         if ($user->the_end) { 
@@ -278,14 +285,13 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
         log_rd2("NEWSTAT: ".$user->stat);
     }
     else {
-        // TODO: verify if we can use only $user struct 
         ignore_user_abort(TRUE);
-        $sem = Room::lock_data();
+        $sem = Room::lock_data(FALSE);
         $S_load_stat['U_heavy']++;
         if (($user = User::load_data($proxy_step['i'], $sess)) == FALSE) {
-            Room::unlock_data();
+            Room::unlock_data($sem);
             ignore_user_abort(FALSE);
-            return (unrecerror());
+            return (blocking_error(TRUE));
         }
         
         if ($cur_step < $user->step) {
@@ -315,29 +321,43 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
             log_mop($user->step, 'index_rd.php: after ret set');
             
             if ($user->the_end == TRUE) {
-                log_rd2("LOGOUT BYE BYE!!");
-                log_auth($user->sess, "Explicit logout.");
+                Room::unlock_data($sem);
                 
-                $S_load_stat['R_the_end']++;
-                $room = Room::load_data();
+                /* Switch to exclusive locking */
+                $sem = Room::lock_data(TRUE);
+
                 unset($user);
+
+                $S_load_stat['R_the_end']++;
+                if (($room = Room::load_data()) == FALSE) {
+                    Room::unlock_data($sem);
+                    ignore_user_abort(FALSE);
+                    return (blocking_error(TRUE));
+                }
+
                 if (($user = $room->get_user($sess, $idx)) == FALSE) {
                     Room::unlock_data($sem);
                     ignore_user_abort(FALSE);
-                    return (unrecerror());
+                    return (blocking_error(TRUE));
                 }              
-                $user->reset();
+
+                log_rd2("LOGOUT BYE BYE!!");
+                log_auth($user->sess, "Explicit logout.");
                 
-                if ($user->subst == 'sitdown') {
-                    log_load("ROOM WAKEUP");
-                    $room->room_wakeup($user);
+                if ($user->the_end == TRUE) {
+                    $user->reset();
+                    
+                    if ($user->subst == 'sitdown') {
+                        log_load("ROOM WAKEUP");
+                        $room->room_wakeup($user);
+                    }
+                    else if ($user->subst == 'standup')
+                        $room->room_outstandup($user);
+                    else
+                        log_rd2("LOGOUT FROM WHAT ???");
+                    
+                    Room::save_data($room);
                 }
-                else if ($user->subst == 'standup')
-                    $room->room_outstandup($user);
-                else
-                    log_rd2("LOGOUT FROM WHAT ???");
-                
-                Room::save_data($room);
             }
         }
         
@@ -360,7 +380,7 @@ function maincheck($sess, $cur_stat, $cur_subst, $cur_step, &$new_stat, &$new_su
    step
 */
 
-$is_page_streaming =  (stristr($HTTP_USER_AGENT, "MSIE") || stristr($HTTP_USER_AGENT, "CHROME") ? TRUE : FALSE);
+$is_page_streaming =  (webservers_exceeded() || stristr($HTTP_USER_AGENT, "MSIE") || stristr($HTTP_USER_AGENT, "CHROME") ? TRUE : FALSE);
 
 header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past