1: # The LearningOnline Network with CAPA
2: # Handler for requesting to have slots added to a students record
3: #
4: # $Id: slotrequest.pm,v 1.2 2005/05/31 21:13:01 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::slotrequest;
31:
32: use strict;
33: use Apache::Constants qw(:common :http :methods);
34: use Apache::loncommon();
35: use Apache::lonlocal;
36: use Apache::lonnet;
37:
38: sub fail {
39: my ($r,$code)=@_;
40: if ($code eq 'not_valid') {
41: $r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>'.$env{'form.symb'});
42:
43: }
44: $r->print('<p><a href="/adm/flip?postdata=return:">'.
45: &mt('Return to last resource').'</a></p>');
46: &end_page($r);
47: }
48:
49: sub start_page {
50: my ($r)=@_;
51: my $html=&Apache::lonxml::xmlbegin();
52: $r->print($html.'<head><title>'.
53: &mt('Request another Worktime').'</title></head>');
54: $r->print(&Apache::loncommon::bodytag('Requesting another Worktime'));
55: }
56:
57: sub end_page {
58: my ($r)=@_;
59: $r->print(&Apache::loncommon::endbodytag().'</html>');
60: }
61:
62: =pod
63:
64: slot_reservations db
65: - keys are
66: - slotname\0id -> value is an hashref of
67: name -> user@domain of holder
68: timestamp -> timestamp of reservation
69: symb -> symb of resource that it is reserved for
70:
71: =cut
72:
73: sub get_course {
74: (undef,my $courseid)=&Apache::lonxml::whichuser();
75: my $cdom=$env{'course.'.$courseid.'.domain'};
76: my $cnum=$env{'course.'.$courseid.'.num'};
77: return ($cnum,$cdom);
78: }
79:
80: sub get_reservation_ids {
81: my ($slot_name)=@_;
82:
83: my ($cnum,$cdom)=&get_course();
84:
85: my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
86: "^$slot_name\0");
87:
88: my ($tmp)=%consumed;
89: if ($tmp=~/^error: 2 / ) {
90: return 0;
91: }
92: return keys(%consumed);
93: }
94:
95: sub space_available {
96: my ($slot_name,$slot)=@_;
97: my $max=$slot->{'maxspace'};
98:
99: if (!defined($max)) { return 1; }
100:
101: my $consumed=scalar(&get_reservation_ids($slot_name));
102: if ($consumed < $max) {
103: return 1
104: }
105: return 0;
106: }
107:
108: sub make_reservation {
109: my ($slot_name,$slot,$symb)=@_;
110: my $max=$slot->{'maxspace'};
111:
112: if (!defined($max)) { return 1; }
113:
114: my (@ids)=&get_reservation_ids($slot_name);
115:
116: # FIXME we could end up having holes...
117: my $last=0;
118: foreach my $id (@ids) {
119: my $num=(split('\0',$id))[1];
120: if ($num > $last) { $last=$num; }
121: }
122:
123: my $wanted=$last+1;
124: if ($wanted >= $max) {
125: # full up
126: return -1;
127: }
128:
129: my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
130: 'timestamp' => time,
131: 'symb' => $symb);
132:
133: my ($cnum,$cdom)=&get_course();
134: my $success=&Apache::lonnet::newput('slot_reservations',
135: {"$slot_name\0$wanted" =>
136: \%reservation},
137: $cdom,$cnum);
138: if ($success eq 'ok') {
139: return $wanted;
140: }
141: # someone else got it
142: return -1;
143: }
144:
145:
146: sub show_choices {
147: my ($r,$symb)=@_;
148:
149: my ($cnum,$cdom)=&get_course();
150: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
151: $r->print('<table border="1">');
152: foreach my $slot (sort
153: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
154: (keys(%slots))) {
155: my $description=$slots{$slot}->{'description'};
156: if (!defined($description)) {
157: $description=&mt('[_1] From [_2] to [_3]',$slot,
158: &Apache::lonlocal::locallocaltime($slots{$slot}->{'starttime'}),
159: &Apache::lonlocal::locallocaltime($slots{$slot}->{'endtime'}));
160: }
161:
162: my $form=&mt('Unavailable');
163: if (&space_available($slot,$slots{$slot})) {
164: $form=<<STUFF;
165: <form>
166: <input type="submit" name="Select" value="Select" />
167: <!-- FIXME needs to send data -->
168: </form>
169: STUFF
170: }
171: $r->print(<<STUFF);
172: <tr>
173: <td>$form</td>
174: <td>$description</td>
175: </tr>
176: STUFF
177: }
178: $r->print('</table>');
179: }
180:
181: sub handler {
182: my $r=shift;
183:
184: &start_page($r);
185: my $symb=&Apache::lonnet::unescape($env{'form.symb'});
186: my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
187: if ($res !~ /\.task$/) {
188: &fail($r,'not_valid');
189: return OK;
190: }
191:
192: if ($env{'form.requestattempt'}) {
193: &show_choices($r,$symb);
194: }
195:
196: &end_page($r);
197: return OK;
198: }
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