# The LearningOnline Network with CAPA
# Handler for requesting to have slots added to a students record
#
# $Id: slotrequest.pm,v 1.4 2005/06/04 08:17:06 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 < $max) {
return 1
}
return 0;
}
sub check_for_reservation {
my ($symb)=@_;
my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
$env{'user.domain'}, $env{'user.name'});
my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
$env{'user.domain'}, $env{'user.name'});
my @slots = (split(/:/,$student), split(/:/, $course));
&Apache::lonxml::debug(" slot list is ".join(':',@slots));
my ($cnum,$cdom)=&get_course();
my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
foreach my $slot_name (@slots) {
next if (!defined($slots{$slot_name}) ||
!ref($slots{$slot_name}));
&Apache::lonxml::debug(time." $slot_name ".
$slots{$slot_name}->{'starttime'}." -- ".
$slots{$slot_name}->{'startreserve'});
if ($slots{$slot_name}->{'starttime'} > time &&
$slots{$slot_name}->{'startreserve'} < time) {
# between start of reservation times and start of slot
return($slot_name, $slots{$slot_name});
}
}
return (undef,undef);
}
# FIXME - depends on the parameter for the resource to be correct
# tho prevent multiple reservations
sub make_reservation {
my ($slot_name,$slot,$symb)=@_;
my ($cnum,$cdom)=&get_course();
my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
$env{'user.domain'},$env{'user.name'});
&Apache::lonxml::debug("value is $value<br />");
foreach my $other_slot (split(/:/, $value)) {
if ($other_slot eq $slot_name) {
my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
$cnum, "^$slot_name\0");
my $me=$env{'user.name'}.'@'.$env{'user.domain'};
foreach my $key (keys(%consumed)) {
if ($consumed{$key}->{'name'} eq $me) {
my $num=(split('\0',$key))[1];
return -$num;
}
}
}
}
my $max=$slot->{'maxspace'};
if (!defined($max)) { $max=99999; }
my (@ids)=&get_reservation_ids($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;
&Apache::lonxml::debug("wanted $wanted<br />");
if ($wanted >= $max) {
# full up
return -1;
}
my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
'timestamp' => time,
'symb' => $symb);
my $success=&Apache::lonnet::newput('slot_reservations',
{"$slot_name\0$wanted" =>
\%reservation},
$cdom, $cnum);
if ($success eq 'ok') {
#FIXME need to set the parm
my $new_value=$slot_name;
if ($value) {
$new_value=$value.':'.$new_value;
}
my $result=&Apache::lonparmset::storeparm_by_symb($symb,
'0_availablestudent',
1, $new_value, 'string',
$env{'user.name'},
$env{'user.domain'});
&Apache::lonxml::debug("hrrm $result");
return $wanted;
}
# someone else got it
return undef;
}
sub get_slot {
my ($r,$symb)=@_;
my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
my $reserved=&make_reservation($env{'form.slotname'},
\%slot,$symb);
my $description=&get_description($env{'form.slotname'},\%slot);
if ($reserved > -1) {
$r->print("<p>Success: $description</p>");
$r->print('<p><a href="/adm/flip?postdata=return:">'.
&mt('Return to last resource').'</a></p>');
return;
} elsif ($reserved < 0) {
$r->print("<p>Already reserved: $description</p>");
$r->print('<p><a href="/adm/flip?postdata=return:">'.
&mt('Return to last resource').'</a></p>');
return;
}
my %lt=('request'=>"Request another attempt",
'try' =>'Try again');
%lt=&Apache::lonlocal::texthash(%lt);
$r->print(<<STUFF);
<p> <font color="red">Failed</font> to reserve a spot for $description. </p>
<p>
<form method="POST" action="/adm/slotrequest">
<input type="submit" name="Try Again" value="$lt{'try'}" />
<input type="hidden" name="symb" value="$env{'form.symb'}" />
<input type="hidden" name="slotname" value="$env{'form.slotname'}" />
<input type="hidden" name="command" value="get" />
</form>
?
</p>
<p>
or
<form method="POST" action="/adm/slotrequest">
<input type="hidden" name="symb" value="$env{'form.symb'}" />
<input type="submit" name="requestattempt" value="$lt{'request'}" />
</form>
</p>
or
STUFF
$r->print('<p><a href="/adm/flip?postdata=return:">'.
&mt('Return to last resource').'</a></p>');
return;
}
sub allowed_slot {
my ($slot_name,$slot,$symb)=@_;
#already started
if ($slot->{'starttime'} < time) {
return 0;
}
#already ended
if ($slot->{'endtime'} < time) {
return 0;
}
# not allowed to pick this one
if (defined($slot->{'type'})
&& $slot->{'type'} ne 'schedulable_student') {
return 0;
}
# not allowed for this resource
if (defined($slot->{'symb'})
&& $slot->{'symb'} ne $symb) {
return 0;
}
return 1;
}
sub get_description {
my ($slot_name,$slot)=@_;
my $description=$slot->{'description'};
if (!defined($description)) {
$description=&mt('[_1] From [_2] to [_3]',$slot_name,
&Apache::lonlocal::locallocaltime($slot->{'starttime'}),
&Apache::lonlocal::locallocaltime($slot->{'endtime'}));
}
return $description;
}
sub show_choices {
my ($r,$symb)=@_;
my ($cnum,$cdom)=&get_course();
my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
my $available;
$r->print('<table border="1">');
foreach my $slot (sort
{ return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
(keys(%slots))) {
next if (!&allowed_slot($slot,$slots{$slot}));
$available++;
my $description=&get_description($slot,$slots{$slot});
my $form=&mt('Unavailable');
if (&space_available($slot,$slots{$slot},$symb)) {
my $escsymb=&Apache::lonnet::escape($symb);
$form=<<STUFF;
<form method="POST" action="/adm/slotrequest">
<input type="submit" name="Select" value="Select" />
<input type="hidden" name="symb" value="$escsymb" />
<input type="hidden" name="slotname" value="$slot" />
<input type="hidden" name="command" value="get" />
</form>
STUFF
}
$r->print(<<STUFF);
<tr>
<td>$form</td>
<td>$description</td>
</tr>
STUFF
}
if (!$available) {
$r->print('<tr><td>No avaliable times. <a href="/adm/flip?postdata=return:">'.
&mt('Return to last resource').'</a></td></tr>');
}
$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);
} elsif ($env{'form.command'} eq 'get') {
&get_slot($r,$symb);
}
&end_page($r);
return OK;
}
1;
__END__
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