[BACK]Return to lonuserstate.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / rat

Diff for /rat/lonuserstate.pm between versions 1.2 and 1.119

version 1.2, 2000/08/02 15:27:10 version 1.119, 2007/06/28 22:16:53
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Construct and maintain state and binary representation of course for user  # Construct and maintain state and binary representation of course for user
 #  #
 # (Server for RAT Maps  # $Id$
 #  #
 # (Edit Handler for RAT Maps  # Copyright Michigan State University Board of Trustees
 # (TeX Content Handler  
 #  #
 # 05/29/00,05/30 Gerd Kortemeyer)  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 # 7/1 Gerd Kortemeyer)  
 # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)  
 #  #
 # 7/15,7/17,7/18,8/1,8/2 Gerd Kortemeyer  # 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/
   #
   ###
   
 package Apache::lonuserstate;  package Apache::lonuserstate;
   
   # ------------------------------------------------- modules used by this module
 use strict;  use strict;
 use Apache::Constants qw(:common :http);  
 use Apache::File;  
 use HTML::TokeParser;  use HTML::TokeParser;
 use Apache::lonnet();  use Apache::lonnet;
   use Apache::lonlocal;
   use Apache::loncommon();
 use GDBM_File;  use GDBM_File;
   use Apache::lonmsg;
   use Safe;
   use Safe::Hole;
   use Opcode;
   use Apache::lonenc;
   use Fcntl qw(:flock);
   use LONCAPA;
    
   
 # ---------------------------------------------------- Globals for this package  # ---------------------------------------------------- Globals for this package
   
 my $pc;      # Package counter  my $pc;      # Package counter
 my %hash;    # The big tied hash  my %hash;    # The big tied hash
   my %parmhash;# The hash with the parameters
 my @cond;    # Array with all of the conditions  my @cond;    # Array with all of the conditions
 my $errtext; # variable with all errors  my $errtext; # variable with all errors
   my $retfrid; # variable with the very first RID in the course
   my $retfurl; # first URL
   my %randompick; # randomly picked resources
   my %randompickseed; # optional seed for randomly picking resources
   my %encurl; # URLs in this folder are supposed to be encrypted
   my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
   
   # ----------------------------------- Remove version from URL and store in hash
   
   sub versiontrack {
       my $uri=shift;
       if ($uri=~/\.(\d+)\.\w+$/) {
    my $version=$1;
    $uri=~s/\.\d+\.(\w+)$/\.$1/;
           unless ($hash{'version_'.$uri}) {
       $hash{'version_'.$uri}=$version;
    }
       }
       return $uri;
   }
   
   # -------------------------------------------------------------- Put in version
   
   sub putinversion {
       my $uri=shift;
       my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
       if ($hash{'version_'.$uri}) {
    my $version=$hash{'version_'.$uri};
    if ($version eq 'mostrecent') { return $uri; }
    if ($version eq &Apache::lonnet::getversion(
    &Apache::lonnet::filelocation('',$uri))) 
                { return $uri; }
    $uri=~s/\.(\w+)$/\.$version\.$1/;
       }
       &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
       return $uri;
   }
   
   # ----------------------------------------- Processing versions file for course
   
   sub processversionfile {
       my %cenv=@_;
       my %versions=&Apache::lonnet::dump('resourceversions',
          $cenv{'domain'},
          $cenv{'num'});
       foreach my $ver (keys(%versions)) {
    if ($ver=~/^error\:/) { return; }
    $hash{'version_'.$ver}=$versions{$ver};
       }
   }
   
 # --------------------------------------------------------- Loads map from disk  # --------------------------------------------------------- Loads map from disk
   
 sub loadmap {   sub loadmap { 
     my $uri=shift;      my $uri=shift;
     if ($hash{'map_pc_'.$uri}) { return OK; }      if ($hash{'map_pc_'.$uri}) { 
    $errtext.=&mt('<br />Multiple use of sequence/page <tt>[_1]</tt>! The course will not function properly.',$uri);
    return; 
       }
     $pc++;      $pc++;
     my $lpc=$pc;      my $lpc=$pc;
     $hash{'map_pc_'.$uri}=$lpc;      $hash{'map_pc_'.$uri}=$lpc;
     $hash{'map_id_'.$lpc}=$uri;      $hash{'map_id_'.$lpc}=$uri;
   
     my $fn='/home/httpd/html'.$uri;  # Determine and check filename
       my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
   
       my $ispage=($fn=~/\.page$/);
   
     unless (($fn=~/\.course$/) ||      unless (($fn=~/\.sequence$/) ||
             ($fn=~/\.sequence$/) ||  
             ($fn=~/\.page$/)) {               ($fn=~/\.page$/)) { 
        $errtext.="Invalid map: $fn\n";   $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
        return OK;    return; 
     }      }
   
     unless (-e $fn) {      my $instr=&Apache::lonnet::getfile($fn);
  my $returned=Apache::lonnet::repcopy($fn);  
         unless ($returned eq OK) {      unless ($instr eq -1) {
            $errtext.="Could not import: $fn - ";  
            if ($returned eq HTTP_SERVICE_UNAVAILABLE) {  # Successfully got file, parse it
       $errtext.="Server unavailable\n";  
            }  
            if ($returned eq HTTP_NOT_FOUND) {  
       $errtext.="File not found\n";  
            }  
            if ($returned eq FORBIDDEN) {  
       $errtext.="Access forbidden\n";  
            }  
            return OK;  
        }  
     }  
   
     if (-e $fn) {  
         my @content;  
         {  
     my $fh=Apache::File->new($fn);  
             @content=<$fh>;  
         }  
         my $instr=join('',@content);  
         my $parser = HTML::TokeParser->new(\$instr);          my $parser = HTML::TokeParser->new(\$instr);
    $parser->attr_encoded(1);
         my $token;          my $token;
   
         my $linkpc=0;          my $linkpc=0;
Line 85  sub loadmap { Line 147  sub loadmap {
     if ($token->[0] eq 'S') {      if ($token->[0] eq 'S') {
                 if ($token->[1] eq 'resource') {                  if ($token->[1] eq 'resource') {
 # -------------------------------------------------------------------- Resource  # -------------------------------------------------------------------- Resource
                       if ($token->[2]->{'type'} eq 'zombie') { next; }
                     my $rid=$lpc.'.'.$token->[2]->{'id'};                      my $rid=$lpc.'.'.$token->[2]->{'id'};
   
                     $hash{'kind_'.$rid}='res';                      $hash{'kind_'.$rid}='res';
                     $hash{'title_'.$rid}=$token->[2]->{'title'};                      $hash{'title_'.$rid}=$token->[2]->{'title'};
                     my $turi=$token->[2]->{'src'};                      my $turi=&versiontrack($token->[2]->{'src'});
                     $hash{'src_'.$rid}=$turi;                      if ($token->[2]->{'version'}) {
    unless ($hash{'version_'.$turi}) {
                     if (defined($hash{'ids_'.$turi})) {      $hash{'version_'.$turi}=$1;
                         $hash{'ids_'.$turi}.=','.$rid;   }
       }
       my $title=$token->[2]->{'title'};
       $title=~s/\&colon\;/\:/gs;
   #    my $symb=&Apache::lonnet::encode_symb($uri,
   #  $token->[2]->{'id'},
   #  $turi);
   #    &Apache::lonnet::do_cache_new('title',$symb,$title);
                       unless ($ispage) {
                           $turi=~/\.(\w+)$/;
                           my $embstyle=&Apache::loncommon::fileembstyle($1);
                           if ($token->[2]->{'external'} eq 'true') { # external
                               $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
                           } elsif ($turi=~/^\/*uploaded\//) { # uploaded
       if (($embstyle eq 'img') 
    || ($embstyle eq 'emb')
    || ($embstyle eq 'wrp')) {
                                   $turi='/adm/wrapper'.$turi;
       } elsif ($embstyle eq 'ssi') {
    #do nothing with these
       } elsif ($turi!~/\.(sequence|page)$/) {
    $turi='/adm/coursedocs/showdoc'.$turi;
                               }
                           } elsif ($turi=~/\S/) { # normal non-empty internal resource
       my $mapdir=$uri;
       $mapdir=~s/[^\/]+$//;
       $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
       if (($embstyle eq 'img') 
    || ($embstyle eq 'emb')
    || ($embstyle eq 'wrp')) {
    $turi='/adm/wrapper'.$turi;
       }
                           }
       }
   # Store reverse lookup, remove query string
       my $idsuri=$turi;
       $idsuri=~s/\?.+$//;
                       if (defined($hash{'ids_'.$idsuri})) {
                           $hash{'ids_'.$idsuri}.=','.$rid;
                     } else {                      } else {
                         $hash{'ids_'.$turi}=''.$rid;                          $hash{'ids_'.$idsuri}=''.$rid;
                     }                      }
                  
                       if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
    $turi.='?register=1';
       }
   
                       $hash{'src_'.$rid}=$turi;
   
                     if ($token->[2]->{'src'}=~/\/\//) {                      if ($token->[2]->{'external'} eq 'true') {
                         $hash{'ext_'.$rid}='true:';                          $hash{'ext_'.$rid}='true:';
                     } else {                      } else {
                         $hash{'ext_'.$rid}='false:';                          $hash{'ext_'.$rid}='false:';
Line 116  sub loadmap { Line 222  sub loadmap {
                         $hash{'type_'.$rid}='normal';                          $hash{'type_'.$rid}='normal';
                     }                      }
   
                     if (($turi=~/\.course$/) ||                      if (($turi=~/\.sequence$/) ||
                         ($turi=~/\.sequence$/) ||  
                         ($turi=~/\.page$/)) {                          ($turi=~/\.page$/)) {
                         $hash{'is_map_'.$rid}=1;                          $hash{'is_map_'.$rid}=1;
                         &loadmap($turi);                          &loadmap($turi);
Line 165  sub loadmap { Line 270  sub loadmap {
                     } else {                      } else {
                         $hash{'from_'.$goesto}=''.$linkid;                          $hash{'from_'.$goesto}=''.$linkid;
                     }                      }
                 }                   } elsif ($token->[1] eq 'param') {
   # ------------------------------------------------------------------- Parameter
   
                       my $referid=$lpc.'.'.$token->[2]->{'to'};
       my $name=$token->[2]->{'name'};
       my $part;
       if ($name=~/^parameter_(.*)_/) {
    $part=$1;
       } else {
    $part=0;
       }
       $name=~s/^.*_([^_]*)$/$1/;
                       my $newparam=
    &escape($token->[2]->{'type'}).':'.
    &escape($part.'.'.$name).'='.
    &escape($token->[2]->{'value'});
                       if (defined($hash{'param_'.$referid})) {
                           $hash{'param_'.$referid}.='&'.$newparam;
                       } else {
                           $hash{'param_'.$referid}=''.$newparam;
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
    $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
    $randompick{$referid}=$token->[2]->{'value'};
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
    $randompickseed{$referid}=$token->[2]->{'value'};
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
    if ($token->[2]->{'value'}=~/^yes$/i) {
       $encurl{$referid}=1;
    }
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
    if ($token->[2]->{'value'}=~/^yes$/i) {
       $hiddenurl{$referid}=1;
    }
                       }
                   } 
   
             }              }
         }          }
   
     } else {      } else {
         $errtext.='Map not loaded: The file does not exist. ';          $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
     }      }
 }  }
   
   # --------------------------------------------------------- Simplify expression
   
   sub simplify {
       my $expression=shift;
   # (0&1) = 1
       $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
   # (8)=8
       $expression=~s/\(([_\.\d]+)\)/$1/g;
   # 8&8=8
       $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
   # 8|8=8
       $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
   # (5&3)&4=5&3&4
       $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
   # (((5&3)|(4&6)))=((5&3)|(4&6))
       $expression=~
    s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
   # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
       $expression=~
    s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
       return $expression;
   }
   
 # -------------------------------------------------------- Build condition hash  # -------------------------------------------------------- Build condition hash
   
 sub traceroute {  sub traceroute {
     my ($sofar,$rid,$beenhere)=shift;      my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
       my $newsofar=$sofar=simplify($sofar);
     unless ($beenhere=~/\&$rid\&/) {      unless ($beenhere=~/\&$rid\&/) {
        $beenhere.=$rid.'&';     $beenhere.=$rid.'&';  
        if (defined($hash{'conditions_'.$rid})) {   my ($mapid,$resid)=split(/\./,$rid);
    $hash{'conditions_'.$rid}=   my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
        '('.$hash{'conditions_'.$rid}.')|('.$sofar.')';   my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
        } else {  
            $hash{'conditions_'.$rid}=$sofar;   if ($hdnflag || lc($hidden) eq 'yes') {
        }      $hiddenurl{$rid}=1;
        if (defined($hash{'is_map_'.$rid})) {   }
            if () {   if (!$hdnflag && lc($hidden) eq 'no') {
        &traceroute($sofar,$startrid,'&');      delete($hiddenurl{$rid});
            }   }
        }  
        if (defined($hash{'to_'.$rid})) {   my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
           map {   if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
    if (($retfrid eq '') && ($hash{'src_'.$rid})
       && ($hash{'src_'.$rid}!~/\.sequence$/)) {
       $retfrid=$rid;
    }
    if (defined($hash{'conditions_'.$rid})) {
       $hash{'conditions_'.$rid}=simplify(
              '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
    } else {
       $hash{'conditions_'.$rid}=$sofar;
    }
   
    # if the expression is just the 0th condition keep it
    # otherwise leave a pointer to this condition expression
    $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
   
    if (defined($hash{'is_map_'.$rid})) {
       if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
    $sofar=$newsofar=
       &traceroute($sofar,
    $hash{'map_start_'.$hash{'src_'.$rid}},'&',
    $encflag || $encurl{$rid},
    $hdnflag || $hiddenurl{$rid});
       }
    }
    if (defined($hash{'to_'.$rid})) {
       foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
  my $further=$sofar;   my $further=$sofar;
                 if ($hash{'undercond_'.$_}) {                  if ($hash{'undercond_'.$id}) {
    if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {      if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
         $further.='&'.$hash{'condid_'.$hash{'undercond_'.$_}};   $further=simplify('('.'_'.$rid.')&('.
    } else {    $hash{'condid_'.$hash{'undercond_'.$id}}.')');
                        $errtext.='Undefined condition ID: '      } else {
                                  .$hash{'undercond_'.$_}.'. ';   $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
                    }      }
                 }                  }
                 &traceroute($further,$hash{'goesto_'.$_},$beenhere);                  $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
           } split(/\,/,$hash{'to_'.$rid});        $encflag,$hdnflag);
        }      }
    }
       }
       return $newsofar;
   }
   
   # ------------------------------ Cascading conditions, quick access, parameters
   
   sub accinit {
       my ($uri,$short,$fn)=@_;
       my %acchash=();
       my %captured=();
       my $condcounter=0;
       $acchash{'acc.cond.'.$short.'.0'}=0;
       foreach my $key (keys(%hash)) {
    if ($key=~/^conditions/) {
       my $expr=$hash{$key};
       # try to find and factor out common sub-expressions
       foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
    my $orig=$sub;
   
    my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
    next if (!defined($factor));
   
    $sub=~s/\Q$factor\E//g;
    $sub=~s/^\(/\($factor\(/;
    $sub.=')';
    $sub=simplify($sub);
    $expr=~s/\Q$orig\E/$sub/;
       }
       $hash{$key}=$expr;
       unless (defined($captured{$expr})) {
    $condcounter++;
    $captured{$expr}=$condcounter;
    $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
       } 
    } elsif ($key=~/^param_(\d+)\.(\d+)/) {
       my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
       $hash{'src_'.$1.'.'.$2});
       foreach my $param (split(/\&/,$hash{$key})) {
    my ($typename,$value)=split(/\=/,$param);
    my ($type,$name)=split(/\:/,$typename);
    $parmhash{$prefix.'.'.&unescape($name)}=
       &unescape($value);
    $parmhash{$prefix.'.'.&unescape($name).'.type'}=
       &unescape($type);
       }
    }
       }
       foreach my $key (keys(%hash)) {
    if ($key=~/^ids/) {
       foreach my $resid (split(/\,/,$hash{$key})) {
    my $uri=$hash{'src_'.$resid};
    my ($uripath,$urifile) =
       &Apache::lonnet::split_uri_for_cond($uri);
    if ($uripath) {
       my $uricond='0';
       if (defined($hash{'conditions_'.$resid})) {
    $uricond=$captured{$hash{'conditions_'.$resid}};
       }
       if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
    if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
       /(\&\Q$urifile\E\:[^\&]*)/) {
       my $replace=$1;
       my $regexp=$replace;
       #$regexp=~s/\|/\\\|/g;
       $acchash{'acc.res.'.$short.'.'.$uripath} =~
    s/\Q$regexp\E/$replace\|$uricond/;
    } else {
       $acchash{'acc.res.'.$short.'.'.$uripath}.=
    $urifile.':'.$uricond.'&';
    }
       } else {
    $acchash{'acc.res.'.$short.'.'.$uripath}=
       '&'.$urifile.':'.$uricond.'&';
       }
    } 
       }
    }
       }
       $acchash{'acc.res.'.$short.'.'}='&:0&';
       my $courseuri=$uri;
       $courseuri=~s/^\/res\///;
       &Apache::lonnet::delenv('(acc\.|httpref\.)');
       &Apache::lonnet::appenv(%acchash);
   }
   
   # ---------------- Selectively delete from randompick maps and hidden url parms
   
   sub hiddenurls {
       my $randomoutentry='';
       foreach my $rid (keys %randompick) {
           my $rndpick=$randompick{$rid};
           my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
   # ------------------------------------------- put existing resources into array
           my @currentrids=();
           foreach my $key (sort(keys(%hash))) {
       if ($key=~/^src_($mpc\.\d+)/) {
    if ($hash{'src_'.$1}) { push @currentrids, $1; }
               }
           }
    # rids are number.number and we want to numercially sort on 
           # the second number
    @currentrids=sort {
       my (undef,$aid)=split(/\./,$a);
       my (undef,$bid)=split(/\./,$b);
       $aid <=> $bid;
    } @currentrids;
           next if ($#currentrids<$rndpick);
   # -------------------------------- randomly eliminate the ones that should stay
    my (undef,$id)=split(/\./,$rid);
           if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
    my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
    &Apache::lonnet::setup_random_from_rndseed($rndseed);
    my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
           for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
    #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
   # -------------------------------------------------------- delete the leftovers
           for (my $k=0; $k<=$#currentrids; $k++) {
               if ($currentrids[$k]) {
    $hash{'randomout_'.$currentrids[$k]}=1;
                   my ($mapid,$resid)=split(/\./,$currentrids[$k]);
                   $randomoutentry.='&'.
       &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
    $resid,
    $hash{'src_'.$currentrids[$k]}
    ).'&';
               }
           }
       }
   # ------------------------------ take care of explicitly hidden urls or folders
       foreach my $rid (keys %hiddenurl) {
    $hash{'randomout_'.$rid}=1;
    my ($mapid,$resid)=split(/\./,$rid);
    $randomoutentry.='&'.
       &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
    $hash{'src_'.$rid}).'&';
       }
   # --------------------------------------- append randomout entry to environment
       if ($randomoutentry) {
    &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
     }      }
 }  }
   
 # ---------------------------------------------------- Read map and all submaps  # ---------------------------------------------------- Read map and all submaps
   
 sub readmap {  sub readmap {
    my $uri=shift;      my $short=shift;
    @cond=();      $short=~s/^\///;
    %hash=();      my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
    $errtext='';      my $fn=$cenv{'fn'};
    $pc=0;      my $uri;
    loadmap($uri);      $short=~s/\//\_/g;
 }      unless ($uri=$cenv{'url'}) { 
    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
 # ---------------------------------------------------------------- Testing only   "Could not load course $short.</font>"); 
    return ('',&mt('No course data available.'));;
 sub handler {      }
     my $r = shift;      @cond=('true:normal');
     $r->content_type('text/html');  
     $r->send_http_header;      open(LOCKFILE,">$fn.db.lock");
     return OK if $r->header_only;      my $lock=0;
     readmap('/res/msu/korte/foo.course');      if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
     $r->print("<html><body>\n");   $lock=1;
     my $hashkey;   unlink($fn.'.db');
     foreach $hashkey (sort keys %hash) {   unlink($fn.'_symb.db');
  $r->print("$hashkey: $hash{$hashkey}<br>\n");   unlink($fn.'.state');
     }   unlink($fn.'parms.db');
     my $i;      }
     $r->print('<hr>');      undef %randompick;
     for ($i=0;$i<=$#cond;$i++) {      undef %hiddenurl;
         $r->print($i.' : '.$cond[$i]."<br>\n");      undef %encurl;
       $retfrid='';
       if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
    (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
    %hash=();
    %parmhash=();
    $errtext='';
    $pc=0;
    &processversionfile(%cenv);
    my $furi=&Apache::lonnet::clutter($uri);
    $hash{'src_0.0'}=&versiontrack($furi);
    $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
    $hash{'ids_'.$furi}='0.0';
    $hash{'is_map_0.0'}=1;
    loadmap($uri);
    if (defined($hash{'map_start_'.$uri})) {
       &Apache::lonnet::appenv("request.course.id"  => $short,
       "request.course.fn"  => $fn,
       "request.course.uri" => $uri);
       $env{'request.course.id'}=$short;
       &traceroute('0',$hash{'map_start_'.$uri},'&');
       &accinit($uri,$short,$fn);
       &hiddenurls();
    }
   # ------------------------------------------------------- Put versions into src
    foreach my $key (keys(%hash)) {
       if ($key=~/^src_/) {
    $hash{$key}=&putinversion($hash{$key});
       } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
    my ($type, $url) = ($1,$2);
    my $value = $hash{$key};
    $hash{$type.&putinversion($url)}=$value;
       }
    }
   # ---------------------------------------------------------------- Encrypt URLs
    foreach my $id (keys(%encurl)) {
   #    $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
       $hash{'encrypted_'.$id}=1;
    }
   # ----------------------------------------------- Close hashes to finally store
   # --------------------------------- Routine must pass this point, no early outs
    $hash{'first_rid'}=$retfrid;
    my ($mapid,$resid)=split(/\./,$retfrid);
    $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
    my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
    $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
    if ($hash{'encrypted_'.$retfrid}) {
       $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
    }
    $hash{'first_url'}=$retfurl;
    unless ((untie(%hash)) && (untie(%parmhash))) {
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".
        "Could not untie coursemap $fn for $uri.</font>"); 
    }
   # ---------------------------------------------------- Store away initial state
    {
       my $cfh;
       if (open($cfh,">$fn.state")) {
    print $cfh join("\n",@cond);
       } else {
    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
    "Could not write statemap $fn for $uri.</font>"); 
       }
    }
    flock(LOCKFILE,LOCK_UN);
    close(LOCKFILE);
       } else {
    # if we are here it is likely because we are already trying to 
    # initialize the course in another child, busy wait trying to 
    # tie the hashes for the next 90 seconds, if we succeed forward 
    # them on to navmaps, if we fail, throw up the Could not init 
    # course screen
    if ($lock) {
       # Got the lock but not the DB files
       flock(LOCKFILE,LOCK_UN);
    }
    untie(%hash);
    untie(%parmhash);
    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
    "Could not tie coursemap $fn for $uri.</font>"); 
    my $i=0;
    while($i<90) {
       $i++;
       sleep(1);
       if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
    (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
    if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
       $retfurl='/adm/navmaps';
       &Apache::lonnet::appenv("request.course.id"  => $short,
       "request.course.fn"  => $fn,
       "request.course.uri" => $uri);
       untie(%hash);
       untie(%parmhash);
       last;
    }
       }
       untie(%hash);
       untie(%parmhash);
    }
    flock(LOCKFILE,LOCK_UN);
    close(LOCKFILE);
     }      }
     $r->print("<h1>$errtext</h1></body></html>\n");      &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
     return OK;  # ------------------------------------------------- Check for critical messages
   
       my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
      $env{'user.name'});
       if ($what[0]) {
    if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
       $retfurl='/adm/email?critical=display';
           }
       }
       return ($retfurl,$errtext);
   }
   
   # ------------------------------------------------------- Evaluate state string
   
   sub evalstate {
       my $fn=$env{'request.course.fn'}.'.state';
       my $state='';
       if (-e $fn) {
    my @conditions=();
    {
       open(my $fh,"<$fn");
       @conditions=<$fh>;
               close($fh);
    }  
    my $safeeval = new Safe;
    my $safehole = new Safe::Hole;
    $safeeval->permit("entereval");
    $safeeval->permit(":base_math");
    $safeeval->deny(":base_io");
    $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
    foreach my $line (@conditions) {
       chomp($line);
       my ($condition,$weight)=split(/\:/,$line);
       if ($safeeval->reval($condition)) {
    if ($weight eq 'force') {
       $state.='3';
    } else {
       $state.='2';
    }
       } else {
    if ($weight eq 'stop') {
       $state.='0';
    } else {
       $state.='1';
    }
       }
    }
       }
       &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
       return $state;
 }  }
   
       
    
 1;  1;
 __END__  __END__
   
   =head1 NAME
   
   Apache::lonuserstate - Construct and maintain state and binary representation
   of course for user
   
   =head1 SYNOPSIS
   
   Invoked by lonroles.pm.
   
   &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
   
   =head1 INTRODUCTION
   
   This module constructs and maintains state and binary representation
   of course for user.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   There is no handler subroutine.
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   loadmap() : Loads map from disk
   
   =item *
   
   simplify() : Simplify expression
   
   =item *
   
   traceroute() : Build condition hash
   
   =item *
   
   accinit() : Cascading conditions, quick access, parameters
   
   =item *
   
   readmap() : Read map and all submaps
   
   =item *
   
   evalstate() : Evaluate state string
   
   =back
   
   =cut
Removed from v.1.2  
changed lines
  Added in v.1.119

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>