# The LearningOnline Network with CAPA
# Handler for requesting to have slots added to a students record
#
# $Id: slotrequest.pm,v 1.2 2005/05/31 21:13:01 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/
#
###
package Apache::slotrequest;
use strict;
use Apache::Constants qw(:common :http :methods);
use Apache::loncommon();
use Apache::lonlocal;
use Apache::lonnet;
sub fail {
my ($r,$code)=@_;
if ($code eq 'not_valid') {
$r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>'.$env{'form.symb'});
}
$r->print('<p><a href="/adm/flip?postdata=return:">'.
&mt('Return to last resource').'</a></p>');
&end_page($r);
}
sub start_page {
my ($r)=@_;
my $html=&Apache::lonxml::xmlbegin();
$r->print($html.'<head><title>'.
&mt('Request another Worktime').'</title></head>');
$r->print(&Apache::loncommon::bodytag('Requesting another Worktime'));
}
sub end_page {
my ($r)=@_;
$r->print(&Apache::loncommon::endbodytag().'</html>');
}
=pod
slot_reservations db
- keys are
- slotname\0id -> value is an hashref of
name -> user@domain of holder
timestamp -> timestamp of reservation
symb -> symb of resource that it is reserved for
=cut
sub get_course {
(undef,my $courseid)=&Apache::lonxml::whichuser();
my $cdom=$env{'course.'.$courseid.'.domain'};
my $cnum=$env{'course.'.$courseid.'.num'};
return ($cnum,$cdom);
}
sub get_reservation_ids {
my ($slot_name)=@_;
my ($cnum,$cdom)=&get_course();
my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
"^$slot_name\0");
my ($tmp)=%consumed;
if ($tmp=~/^error: 2 / ) {
return 0;
}
return keys(%consumed);
}
sub space_available {
my ($slot_name,$slot)=@_;
my $max=$slot->{'maxspace'};
if (!defined($max)) { return 1; }
my $consumed=scalar(&get_reservation_ids($slot_name));
if ($consumed < $max) {
return 1
}
return 0;
}
sub make_reservation {
my ($slot_name,$slot,$symb)=@_;
my $max=$slot->{'maxspace'};
if (!defined($max)) { return 1; }
my (@ids)=&get_reservation_ids($slot_name);
# FIXME we could end up having holes...
my $last=0;
foreach my $id (@ids) {
my $num=(split('\0',$id))[1];
if ($num > $last) { $last=$num; }
}
my $wanted=$last+1;
if ($wanted >= $max) {
# full up
return -1;
}
my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
'timestamp' => time,
'symb' => $symb);
my ($cnum,$cdom)=&get_course();
my $success=&Apache::lonnet::newput('slot_reservations',
{"$slot_name\0$wanted" =>
\%reservation},
$cdom,$cnum);
if ($success eq 'ok') {
return $wanted;
}
# someone else got it
return -1;
}
sub show_choices {
my ($r,$symb)=@_;
my ($cnum,$cdom)=&get_course();
my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
$r->print('<table border="1">');
foreach my $slot (sort
{ return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
(keys(%slots))) {
my $description=$slots{$slot}->{'description'};
if (!defined($description)) {
$description=&mt('[_1] From [_2] to [_3]',$slot,
&Apache::lonlocal::locallocaltime($slots{$slot}->{'starttime'}),
&Apache::lonlocal::locallocaltime($slots{$slot}->{'endtime'}));
}
my $form=&mt('Unavailable');
if (&space_available($slot,$slots{$slot})) {
$form=<<STUFF;
<form>
<input type="submit" name="Select" value="Select" />
<!-- FIXME needs to send data -->
</form>
STUFF
}
$r->print(<<STUFF);
<tr>
<td>$form</td>
<td>$description</td>
</tr>
STUFF
}
$r->print('</table>');
}
sub handler {
my $r=shift;
&start_page($r);
my $symb=&Apache::lonnet::unescape($env{'form.symb'});
my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
if ($res !~ /\.task$/) {
&fail($r,'not_valid');
return OK;
}
if ($env{'form.requestattempt'}) {
&show_choices($r,$symb);
}
&end_page($r);
return OK;
}
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