--- loncom/lonnet/perl/lonnet.pm	2001/11/17 15:36:06	1.171
+++ loncom/lonnet/perl/lonnet.pm	2001/12/04 15:19:11	1.180
@@ -1,6 +1,30 @@
 # The LearningOnline Network
 # TCP networking package
 #
+# $Id: lonnet.pm,v 1.180 2001/12/04 15:19:11 albertel Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
 # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
 # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
 # 11/8,11/16,11/18,11/22,11/23,12/22,
@@ -35,10 +59,9 @@
 # 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
 # 10/2 Gerd Kortemeyer
 # 10/5,10/10,11/13,11/15 Scott Harrison
+# 11/17,11/20,11/22,11/29 Gerd Kortemeyer
 #
-# $Id: lonnet.pm,v 1.171 2001/11/17 15:36:06 www Exp $
-#
-# 11/17 Gerd Kortemeyer
+# $Id: lonnet.pm,v 1.180 2001/12/04 15:19:11 albertel Exp $
 #
 ###
 
@@ -940,7 +963,7 @@ sub tmpreset {
 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
 	  &GDBM_WRCREAT,0640)) {
     foreach my $key (keys %hash) {
-      if ($key=~ /:$symb:/) {
+      if ($key=~ /:$symb/) {
 	delete($hash{$key});
       }
     }
@@ -1663,7 +1686,6 @@ sub definerole {
 
 sub metadata_query {
     my ($query,$custom,$customshow)=@_;
-    # need to put in a library server loop here and return a hash
     my %rhash;
     for my $server (keys %libserv) {
 	unless ($custom or $customshow) {
@@ -2234,12 +2256,20 @@ sub EXT {
 # ---------------------------------------------------------------- Get metadata
 
 sub metadata {
-    my ($uri,$what,$liburi,$prefix)=@_;
+    my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
 
     $uri=&declutter($uri);
     my $filename=$uri;
     $uri=~s/\.meta$//;
-    unless ($metacache{$uri.':keys'}) {
+#
+# Is the metadata already cached?
+# Look at timestamp of caching
+# Everything is cached by the main uri, libraries are never directly cached
+#
+    unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
+#
+# Is this a recursive call for a library?
+#
         if ($liburi) {
 	    $liburi=&declutter($liburi);
             $filename=$liburi;
@@ -2253,10 +2283,17 @@ sub metadata {
         while ($token=$parser->get_token) {
            if ($token->[0] eq 'S') {
 	     if (defined($token->[2]->{'package'})) {
+#
+# This is a package - get package info
+#
 	      my $package=$token->[2]->{'package'};
 	      my $keyroot='';
-              if (defined($token->[2]->{'part'})) { 
-                 $keyroot.='_'.$token->[2]->{'part'}; 
+              if ($prefix) {
+		  $keyroot.='_'.$prefix;
+              } else {
+                if (defined($token->[2]->{'part'})) { 
+                   $keyroot.='_'.$token->[2]->{'part'}; 
+	        }
 	      }
               if (defined($token->[2]->{'id'})) { 
                  $keyroot.='_'.$token->[2]->{'id'}; 
@@ -2285,14 +2322,42 @@ sub metadata {
                   }
               } keys %packagetab;
              } else {
-	      my $entry=$token->[1];
-              my $unikey=$entry;
-              if (defined($token->[2]->{'part'})) { 
-                 $unikey.='_'.$token->[2]->{'part'}; 
+#
+# This is not a package - some other kind of start tag
+# 
+              my $entry=$token->[1];
+              my $unikey;
+              if ($entry eq 'import') {
+                 $unikey='';
+              } else {
+                 $unikey=$entry;
+	      }
+              if ($prefix) {
+		  $unikey.=$prefix;
+              } else {
+                if (defined($token->[2]->{'part'})) { 
+                   $unikey.='_'.$token->[2]->{'part'}; 
+	        }
 	      }
               if (defined($token->[2]->{'id'})) { 
                  $unikey.='_'.$token->[2]->{'id'}; 
 	      }
+
+             if ($entry eq 'import') {
+#
+# Importing a library here
+#                
+		 if (defined($depthcount)) { $depthcount++; } else 
+                                           { $depthcount=0; }
+                 if ($depthcount<20) {
+		     map {
+                         $metathesekeys{$_}=1;
+		     } split(/\,/,&metadata($uri,'keys',
+                                  $parser->get_text('/import'),$unikey,
+                                  $depthcount));
+		 }
+             } else { 
+
               if (defined($token->[2]->{'name'})) { 
                  $unikey.='_'.$token->[2]->{'name'}; 
 	      }
@@ -2305,10 +2370,16 @@ sub metadata {
 		      ) { $metacache{$uri.':'.$unikey}=
 			      $metacache{$uri.':'.$unikey.'.default'};
 		      }
-	    }
+# end of not-a-package not-a-library import
+	   }
+# end of not-a-package start tag
+	  }
+# the next is the end of "start tag"
 	 }
        }
        $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
+       $metacache{$uri.':cachedtimestamp'}=time;
+# this is the end of "was not already recently cached
     }
     return $metacache{$uri.':'.$what};
 }
@@ -2338,6 +2409,7 @@ sub symblist {
 sub symbread {
     my $thisfn=shift;
     unless ($thisfn) {
+        if ($ENV{'request.symb'}) { return $ENV{'request.symb'}; }
 	$thisfn=$ENV{'request.filename'};
     }
     $thisfn=declutter($thisfn);
@@ -2534,8 +2606,7 @@ sub unescape {
 
 # ================================================================ Main Program
 
-sub BEGIN {
-unless ($readit) {
+BEGIN {
 # ------------------------------------------------------------ Read access.conf
 {
     my $config=Apache::File->new("/etc/httpd/conf/access.conf");
@@ -2635,5 +2706,5 @@ $readit='done';
 &logtouch();
 &logthis('<font color=yellow>INFO: Read configuration</font>');
 }
-}
+
 1;