--- loncom/loncron	2019/03/18 00:37:37	1.118
+++ loncom/loncron	2020/01/11 22:37:19	1.121
@@ -2,7 +2,7 @@
 
 # Housekeeping program, started by cron, loncontrol and loncron.pl
 #
-# $Id: loncron,v 1.118 2019/03/18 00:37:37 raeburn Exp $
+# $Id: loncron,v 1.121 2020/01/11 22:37:19 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -567,6 +567,34 @@ sub clean_webDAV_sessionIDs {
     }
 }
 
+# ------------------------------------------------------------ clean out ltiIDs
+
+sub clean_ltiIDs {
+    my ($fh)=@_;
+    &log($fh,'<hr /><a name="ltisessions" /><h2>LTI Session Pointers</h2>');
+    my $cleaned=0;
+    my $active=0;
+    if (-d $perlvar{'ltiIDsDir'}) {
+        while (my $fname=<$perlvar{'ltiIDsDir'}/*>) {
+            my ($dev,$ino,$mode,$nlink,
+                $uid,$gid,$rdev,$size,
+                $atime,$mtime,$ctime,
+                $blksize,$blocks)=stat($fname);
+            my $now=time;
+            my $since=$now-$mtime;
+            if ($since>$perlvar{'lonExpire'}) {
+                $cleaned++;
+                &log($fh,"Unlinking $fname<br />");
+                unlink("$fname");
+            } else {
+                $active++;
+            }
+        }
+    }
+    &log($fh,"<p>Cleaned up ".$cleaned." old LTI session pointers.</p>");
+    &log($fh,"<h3>$active unexpired LTI session pointers</h3>");
+}
+
 # ----------------------------------------------------------- clean out sockets
 sub clean_sockets {
     my ($fh)=@_;
@@ -1068,7 +1096,7 @@ sub write_hostips {
     if (keys(%prevhosts) && keys(%currhosts)) {
         foreach my $key (keys(%prevhosts)) {
             unless ($currhosts{$key} eq $prevhosts{$key}) {
-                $ipchange{$key} = $prevhosts{$key}.'|'.$currhosts{$key};
+                $ipchange{$key} = $prevhosts{$key}.' | '.$currhosts{$key};
             }
         }
         foreach my $key (keys(%currhosts)) {
@@ -1081,10 +1109,10 @@ sub write_hostips {
         if (keys(%ipchange)) {
             if (open(my $fh,'>>',$perlvar{'lonDaemons'}.'/logs/hostip.log')) {
                print $fh "********************\n".localtime(time).' Changes --'."\n".
-                         "Hostname | Previous IP | New IP\n".
-                         "--------------------------------\n";
+                         "| Hostname | Previous IP | New IP |\n".
+                         " --------------------------------- \n";
                foreach my $hostname (sort(keys(%ipchange))) {
-                    print $fh "$hostname | $ipchange{$hostname}\n";
+                    print $fh "| $hostname | $ipchange{$hostname} |\n";
                 }
                 print $fh "\n*******************\n\n";
                 close($fh);
@@ -1099,10 +1127,10 @@ sub write_hostips {
                               "MIME-Version: 1.0\n\n".
                               "Host/IP changes\n".
                               " \n".
-                              "Hostname | Previous IP | New IP\n".
-                              "--------------------------------\n";
+                              "| Hostname | Previous IP | New IP |\n".
+                              " --------------------------------- \n";
                 foreach my $hostname (sort(keys(%ipchange))) {
-                    $chgmail .= "$hostname | $ipchange{$hostname}\n";
+                    $chgmail .= "| $hostname | $ipchange{$hostname} |\n";
                 }
                 $chgmail .= "\n\n";
                 if (open(my $mailh, "|/usr/lib/sendmail -oi -t -odb")) {
@@ -1595,6 +1623,7 @@ sub main () {
 	&clean_lonIDs($fh);
         &clean_balanceIDs($fh);
         &clean_webDAV_sessionIDs($fh);
+        &clean_ltiIDs($fh);
 	&check_httpd_logs($fh);
 	&rotate_lonnet_logs($fh);
 	&rotate_other_logs($fh);