1: # The LearningOnline Network with CAPA
2: # Handler for requesting to have slots added to a students record
3: #
4: # $Id: slotrequest.pm,v 1.4 2005/06/04 08:17:06 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 < $max) {
103: return 1
104: }
105: return 0;
106: }
107:
108: sub check_for_reservation {
109: my ($symb)=@_;
110: my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
111: $env{'user.domain'}, $env{'user.name'});
112:
113: my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
114: $env{'user.domain'}, $env{'user.name'});
115: my @slots = (split(/:/,$student), split(/:/, $course));
116:
117: &Apache::lonxml::debug(" slot list is ".join(':',@slots));
118:
119: my ($cnum,$cdom)=&get_course();
120: my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
121:
122: foreach my $slot_name (@slots) {
123: next if (!defined($slots{$slot_name}) ||
124: !ref($slots{$slot_name}));
125: &Apache::lonxml::debug(time." $slot_name ".
126: $slots{$slot_name}->{'starttime'}." -- ".
127: $slots{$slot_name}->{'startreserve'});
128: if ($slots{$slot_name}->{'starttime'} > time &&
129: $slots{$slot_name}->{'startreserve'} < time) {
130: # between start of reservation times and start of slot
131: return($slot_name, $slots{$slot_name});
132: }
133: }
134: return (undef,undef);
135: }
136:
137: # FIXME - depends on the parameter for the resource to be correct
138: # tho prevent multiple reservations
139:
140: sub make_reservation {
141: my ($slot_name,$slot,$symb)=@_;
142:
143: my ($cnum,$cdom)=&get_course();
144:
145: my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
146: $env{'user.domain'},$env{'user.name'});
147: &Apache::lonxml::debug("value is $value<br />");
148: foreach my $other_slot (split(/:/, $value)) {
149: if ($other_slot eq $slot_name) {
150: my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
151: $cnum, "^$slot_name\0");
152:
153: my $me=$env{'user.name'}.'@'.$env{'user.domain'};
154: foreach my $key (keys(%consumed)) {
155: if ($consumed{$key}->{'name'} eq $me) {
156: my $num=(split('\0',$key))[1];
157: return -$num;
158: }
159: }
160: }
161: }
162:
163: my $max=$slot->{'maxspace'};
164: if (!defined($max)) { $max=99999; }
165:
166: my (@ids)=&get_reservation_ids($slot_name);
167:
168: # FIXME we could end up having holes...
169: my $last=0;
170: foreach my $id (@ids) {
171: my $num=(split('\0',$id))[1];
172: if ($num > $last) { $last=$num; }
173: }
174:
175: my $wanted=$last+1;
176: &Apache::lonxml::debug("wanted $wanted<br />");
177: if ($wanted >= $max) {
178: # full up
179: return -1;
180: }
181:
182: my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
183: 'timestamp' => time,
184: 'symb' => $symb);
185:
186: my $success=&Apache::lonnet::newput('slot_reservations',
187: {"$slot_name\0$wanted" =>
188: \%reservation},
189: $cdom, $cnum);
190:
191: if ($success eq 'ok') {
192: #FIXME need to set the parm
193: my $new_value=$slot_name;
194: if ($value) {
195: $new_value=$value.':'.$new_value;
196: }
197: my $result=&Apache::lonparmset::storeparm_by_symb($symb,
198: '0_availablestudent',
199: 1, $new_value, 'string',
200: $env{'user.name'},
201: $env{'user.domain'});
202: &Apache::lonxml::debug("hrrm $result");
203: return $wanted;
204: }
205:
206: # someone else got it
207: return undef;
208: }
209:
210: sub get_slot {
211: my ($r,$symb)=@_;
212:
213: my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
214: my $reserved=&make_reservation($env{'form.slotname'},
215: \%slot,$symb);
216: my $description=&get_description($env{'form.slotname'},\%slot);
217: if ($reserved > -1) {
218: $r->print("<p>Success: $description</p>");
219: $r->print('<p><a href="/adm/flip?postdata=return:">'.
220: &mt('Return to last resource').'</a></p>');
221: return;
222: } elsif ($reserved < 0) {
223: $r->print("<p>Already reserved: $description</p>");
224: $r->print('<p><a href="/adm/flip?postdata=return:">'.
225: &mt('Return to last resource').'</a></p>');
226: return;
227: }
228:
229: my %lt=('request'=>"Request another attempt",
230: 'try' =>'Try again');
231: %lt=&Apache::lonlocal::texthash(%lt);
232:
233: $r->print(<<STUFF);
234: <p> <font color="red">Failed</font> to reserve a spot for $description. </p>
235: <p>
236: <form method="POST" action="/adm/slotrequest">
237: <input type="submit" name="Try Again" value="$lt{'try'}" />
238: <input type="hidden" name="symb" value="$env{'form.symb'}" />
239: <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
240: <input type="hidden" name="command" value="get" />
241: </form>
242: ?
243: </p>
244: <p>
245: or
246: <form method="POST" action="/adm/slotrequest">
247: <input type="hidden" name="symb" value="$env{'form.symb'}" />
248: <input type="submit" name="requestattempt" value="$lt{'request'}" />
249: </form>
250: </p>
251: or
252: STUFF
253: $r->print('<p><a href="/adm/flip?postdata=return:">'.
254: &mt('Return to last resource').'</a></p>');
255: return;
256: }
257:
258: sub allowed_slot {
259: my ($slot_name,$slot,$symb)=@_;
260: #already started
261: if ($slot->{'starttime'} < time) {
262: return 0;
263: }
264:
265: #already ended
266: if ($slot->{'endtime'} < time) {
267: return 0;
268: }
269:
270: # not allowed to pick this one
271: if (defined($slot->{'type'})
272: && $slot->{'type'} ne 'schedulable_student') {
273: return 0;
274: }
275:
276: # not allowed for this resource
277: if (defined($slot->{'symb'})
278: && $slot->{'symb'} ne $symb) {
279: return 0;
280: }
281:
282: return 1;
283: }
284:
285: sub get_description {
286: my ($slot_name,$slot)=@_;
287: my $description=$slot->{'description'};
288: if (!defined($description)) {
289: $description=&mt('[_1] From [_2] to [_3]',$slot_name,
290: &Apache::lonlocal::locallocaltime($slot->{'starttime'}),
291: &Apache::lonlocal::locallocaltime($slot->{'endtime'}));
292: }
293: return $description;
294: }
295:
296: sub show_choices {
297: my ($r,$symb)=@_;
298:
299: my ($cnum,$cdom)=&get_course();
300: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
301: my $available;
302: $r->print('<table border="1">');
303: foreach my $slot (sort
304: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
305: (keys(%slots))) {
306:
307: next if (!&allowed_slot($slot,$slots{$slot}));
308:
309: $available++;
310:
311: my $description=&get_description($slot,$slots{$slot});
312:
313: my $form=&mt('Unavailable');
314: if (&space_available($slot,$slots{$slot},$symb)) {
315: my $escsymb=&Apache::lonnet::escape($symb);
316: $form=<<STUFF;
317: <form method="POST" action="/adm/slotrequest">
318: <input type="submit" name="Select" value="Select" />
319: <input type="hidden" name="symb" value="$escsymb" />
320: <input type="hidden" name="slotname" value="$slot" />
321: <input type="hidden" name="command" value="get" />
322: </form>
323: STUFF
324: }
325: $r->print(<<STUFF);
326: <tr>
327: <td>$form</td>
328: <td>$description</td>
329: </tr>
330: STUFF
331: }
332:
333: if (!$available) {
334: $r->print('<tr><td>No avaliable times. <a href="/adm/flip?postdata=return:">'.
335: &mt('Return to last resource').'</a></td></tr>');
336: }
337: $r->print('</table>');
338: }
339:
340: sub handler {
341: my $r=shift;
342:
343: &start_page($r);
344: my $symb=&Apache::lonnet::unescape($env{'form.symb'});
345: my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
346: if ($res !~ /\.task$/) {
347: &fail($r,'not_valid');
348: return OK;
349: }
350:
351: if ($env{'form.requestattempt'}) {
352: &show_choices($r,$symb);
353: } elsif ($env{'form.command'} eq 'get') {
354: &get_slot($r,$symb);
355: }
356: &end_page($r);
357: return OK;
358: }
359:
360: 1;
361: __END__
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