1: # The LearningOnline Network with CAPA
2: # Handler for requesting to have slots added to a students record
3: #
4: # $Id: slotrequest.pm,v 1.6 2005/08/09 15:04:50 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: sub check_for_conflict {
138: my ($symb,$new_slot_name)=@_;
139: my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
140: $env{'user.domain'}, $env{'user.name'});
141: my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
142: $env{'user.domain'}, $env{'user.name'});
143: my @slots = (split(/:/,$student), split(/:/, $course));
144: my ($cnum,$cdom)=&get_course();
145: my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
146: foreach my $slot_name (@slots) {
147: next if (!defined($slots{$slot_name}) ||
148: !ref($slots{$slot_name}));
149:
150: next if (!defined($slots{$slot_name}->{'uniqueperiod'}) ||
151: !ref($slots{$slot_name}->{'uniqueperiod'}));
152: my ($start,$end)=@{$slots{$slot_name}->{'uniqueperiod'}};
153: if ($start<time && time < $end) {
154: return $slot_name;
155: }
156: }
157: return undef;
158:
159: }
160:
161: # FIXME - depends on the parameter for the resource to be correct
162: # to prevent multiple reservations
163:
164: sub make_reservation {
165: my ($slot_name,$slot,$symb)=@_;
166:
167: my ($cnum,$cdom)=&get_course();
168:
169: my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
170: $env{'user.domain'},$env{'user.name'});
171: &Apache::lonxml::debug("value is $value<br />");
172: foreach my $other_slot (split(/:/, $value)) {
173: if ($other_slot eq $slot_name) {
174: my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
175: $cnum, "^$slot_name\0");
176:
177: my $me=$env{'user.name'}.'@'.$env{'user.domain'};
178: foreach my $key (keys(%consumed)) {
179: if ($consumed{$key}->{'name'} eq $me) {
180: my $num=(split('\0',$key))[1];
181: return -$num;
182: }
183: }
184: }
185: }
186:
187: my $max=$slot->{'maxspace'};
188: if (!defined($max)) { $max=99999; }
189:
190: my (@ids)=&get_reservation_ids($slot_name);
191:
192: # FIXME we could end up having holes...
193: my $last=0;
194: foreach my $id (@ids) {
195: my $num=(split('\0',$id))[1];
196: if ($num > $last) { $last=$num; }
197: }
198:
199: my $wanted=$last+1;
200: &Apache::lonxml::debug("wanted $wanted<br />");
201: if ($wanted >= $max) {
202: # full up
203: return -1;
204: }
205:
206: my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
207: 'timestamp' => time,
208: 'symb' => $symb);
209:
210: my $success=&Apache::lonnet::newput('slot_reservations',
211: {"$slot_name\0$wanted" =>
212: \%reservation},
213: $cdom, $cnum);
214:
215: if ($success eq 'ok') {
216: #FIXME need to set the parm
217: my $new_value=$slot_name;
218: if ($value) {
219: $new_value=$value.':'.$new_value;
220: }
221: my $result=&Apache::lonparmset::storeparm_by_symb($symb,
222: '0_availablestudent',
223: 1, $new_value, 'string',
224: $env{'user.name'},
225: $env{'user.domain'});
226: &Apache::lonxml::debug("hrrm $result");
227: return $wanted;
228: }
229:
230: # someone else got it
231: return undef;
232: }
233:
234: sub release_slot {
235: my ($r,$symb,$slot_name,$inhibit_return_link)=@_;
236:
237: if ($slot_name eq '') { $slot_name=$env{'form.slotname'}; }
238: my ($cnum,$cdom)=&get_course();
239:
240: # get parameter string, check for existance, rebuild string with the slot
241:
242: my @slots = split(/:/,&Apache::lonnet::EXT("resource.0.availablestudent",
243: $symb,$env{'user.domain'},
244: $env{'user.name'}));
245: my @new_slots;
246: foreach my $exist_slot (@slots) {
247: if ($exist_slot eq $slot_name) { next; }
248: push(@new_slots,$exist_slot);
249: }
250: my $new_param = join(':',@new_slots);
251:
252: # get slot reservations, check if user has one, if so remove reservation
253: my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
254: "^$slot_name\0");
255: foreach my $entry (keys(%consumed)) {
256: if ( $consumed{$entry}->{'name'} eq
257: ($env{'user.name'}.'@'.$env{'user.domain'}) ) {
258: &Apache::lonnet::del('slot_reservations',[$entry],
259: $cdom,$cnum);
260: }
261: }
262: # store new parameter string
263: my $result=&Apache::lonparmset::storeparm_by_symb($symb,
264: '0_availablestudent',
265: 1, $new_param, 'string',
266: $env{'user.name'},
267: $env{'user.domain'});
268: my %slot=&Apache::lonnet::get_slot($slot_name);
269: my $description=&get_description($env{'form.slotname'},\%slot);
270: $r->print("<p>Released Reservation: $description</p>");
271: if ($inhibit_return_link) {
272: $r->print('<p><a href="/adm/flip?postdata=return:">'.
273: &mt('Return to last resource').'</a></p>');
274: }
275: return 1;
276: }
277:
278: sub get_slot {
279: my ($r,$symb)=@_;
280:
281: my $slot_name=&check_for_conflict($symb,$env{'form.slotname'});
282: if ($slot_name) {
283: my %slot=&Apache::lonnet::get_slot($slot_name);
284: my $description1=&get_description($slot_name,\%slot);
285: %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
286: my $description2=&get_description($env{'form.slotname'},\%slot);
287: $r->print("<p>Already have a reservation: $description1</p>");
288: $r->print(<<STUFF);
289: <form method="POST" action="/adm/slotrequest">
290: <input type="hidden" name="symb" value="$env{'form.symb'}" />
291: <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
292: <input type="hidden" name="releaseslot" value="$slot_name" />
293: <input type="hidden" name="command" value="change" />
294: STUFF
295: $r->print("<p>You can either ");
296: $r->print(<<STUFF);
297: <input type="submit" name="change" value="Change" />
298: STUFF
299: $r->print(' your reservation from <b>'.$description1.'</b> to <b>'.
300: $description2.
301: '</b> <br />or <a href="/adm/flip?postdata=return:">'.
302: &mt('Return to last resource').'</a></p>');
303: $r->print(<<STUFF);
304: </form>
305: STUFF
306: # FIXME add button to free current reservation and get new one
307: return;
308: }
309: my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
310: my $reserved=&make_reservation($env{'form.slotname'},
311: \%slot,$symb);
312: my $description=&get_description($env{'form.slotname'},\%slot);
313: if ($reserved > -1) {
314: $r->print("<p>Success: $description</p>");
315: $r->print('<p><a href="/adm/flip?postdata=return:">'.
316: &mt('Return to last resource').'</a></p>');
317: return;
318: } elsif ($reserved < 0) {
319: $r->print("<p>Already reserved: $description</p>");
320: $r->print('<p><a href="/adm/flip?postdata=return:">'.
321: &mt('Return to last resource').'</a></p>');
322: return;
323: }
324:
325: my %lt=('request'=>"Request another attempt",
326: 'try' =>'Try again');
327: %lt=&Apache::lonlocal::texthash(%lt);
328:
329: $r->print(<<STUFF);
330: <p> <font color="red">Failed</font> to reserve a spot for $description. </p>
331: <p>
332: <form method="POST" action="/adm/slotrequest">
333: <input type="submit" name="Try Again" value="$lt{'try'}" />
334: <input type="hidden" name="symb" value="$env{'form.symb'}" />
335: <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
336: <input type="hidden" name="command" value="get" />
337: </form>
338: ?
339: </p>
340: <p>
341: or
342: <form method="POST" action="/adm/slotrequest">
343: <input type="hidden" name="symb" value="$env{'form.symb'}" />
344: <input type="submit" name="requestattempt" value="$lt{'request'}" />
345: </form>
346: </p>
347: or
348: STUFF
349: $r->print('<p><a href="/adm/flip?postdata=return:">'.
350: &mt('Return to last resource').'</a></p>');
351: return;
352: }
353:
354: sub allowed_slot {
355: my ($slot_name,$slot,$symb)=@_;
356: #already started
357: if ($slot->{'starttime'} < time) {
358: # all open slot to be schedulable
359: #return 0;
360: }
361: &Apache::lonxml::debug("$slot_name starttime good");
362: #already ended
363: if ($slot->{'endtime'} < time) {
364: return 0;
365: }
366: &Apache::lonxml::debug("$slot_name endtime good");
367: # not allowed to pick this one
368: if (defined($slot->{'type'})
369: && $slot->{'type'} ne 'schedulable_student') {
370: return 0;
371: }
372: &Apache::lonxml::debug("$slot_name type good");
373: # not allowed for this resource
374: if (defined($slot->{'symb'})
375: && $slot->{'symb'} ne $symb) {
376: return 0;
377: }
378: &Apache::lonxml::debug("$slot_name symb good");
379: return 1;
380: }
381:
382: sub get_description {
383: my ($slot_name,$slot)=@_;
384: my $description=$slot->{'description'};
385: if (!defined($description)) {
386: $description=&mt('[_1] From [_2] to [_3]',$slot_name,
387: &Apache::lonlocal::locallocaltime($slot->{'starttime'}),
388: &Apache::lonlocal::locallocaltime($slot->{'endtime'}));
389: }
390: return $description;
391: }
392:
393: sub show_choices {
394: my ($r,$symb)=@_;
395:
396: my ($cnum,$cdom)=&get_course();
397: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
398: my $available;
399: $r->print('<table border="1">');
400: &Apache::lonxml::debug("Checking Slots");
401: my ($got_slot)=&check_for_reservation($symb);
402: foreach my $slot (sort
403: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
404: (keys(%slots))) {
405:
406: &Apache::lonxml::debug("Checking Slot $slot");
407: next if (!&allowed_slot($slot,$slots{$slot}));
408:
409: $available++;
410:
411: my $description=&get_description($slot,$slots{$slot});
412:
413: my $form=&mt('Unavailable');
414: if (&space_available($slot,$slots{$slot},$symb)) {
415: my $text=&mt('Select');
416: my $command='get';
417: if ($slot eq $got_slot) {
418: $text=&mt('Free Reservation');
419: $command='release';
420: }
421: my $escsymb=&Apache::lonnet::escape($symb);
422: $form=<<STUFF;
423: <form method="POST" action="/adm/slotrequest">
424: <input type="submit" name="Select" value="$text" />
425: <input type="hidden" name="symb" value="$escsymb" />
426: <input type="hidden" name="slotname" value="$slot" />
427: <input type="hidden" name="command" value="$command" />
428: </form>
429: STUFF
430: }
431: $r->print(<<STUFF);
432: <tr>
433: <td>$form</td>
434: <td>$description</td>
435: </tr>
436: STUFF
437: }
438:
439: if (!$available) {
440: $r->print('<tr><td>No available times. <a href="/adm/flip?postdata=return:">'.
441: &mt('Return to last resource').'</a></td></tr>');
442: }
443: $r->print('</table>');
444: }
445:
446: sub show_table {
447: my ($r,$symb)=@_;
448:
449: my ($cnum,$cdom)=&get_course();
450: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
451: my $available;
452: $r->print('<table border="1">');
453: foreach my $slot (sort
454: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
455: (keys(%slots))) {
456: if (defined($slots{$slot}->{'type'})
457: && $slots{$slot}->{'type'} ne 'schedulable_student') {
458: next;
459: }
460: my $description=&get_description($slot,$slots{$slot});
461: my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
462: "^$slot\0");
463: my $ids;
464: foreach my $entry (sort(keys(%consumed))) {
465: my (undef,$id)=split("\0",$entry);
466: $ids.= $id.'-> '.$consumed{$entry}->{'name'}.'<br />';
467: }
468: my $start=localtime($slots{$slot}->{'starttime'});
469: my $end=localtime($slots{$slot}->{'endtime'});
470: $r->print(<<STUFF);
471: <tr>
472: <td>$slot</td>
473: <td>$description</td>
474: <td>$start</td>
475: <td>$end</td>
476: <td>$slots{$slot}->{'maxspace'}</td>
477: <td>$ids</td>
478: </tr>
479: STUFF
480: }
481: $r->print('</table>');
482: }
483:
484: sub handler {
485: my $r=shift;
486:
487: &start_page($r);
488: my $symb=&Apache::lonnet::unescape($env{'form.symb'});
489: my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
490: if ($res !~ /\.task$/) {
491: &fail($r,'not_valid');
492: return OK;
493: }
494:
495: if ($env{'form.command'} eq 'showslots') {
496: &show_table($r,$symb);
497: } elsif ($env{'form.requestattempt'}) {
498: &show_choices($r,$symb);
499: } elsif ($env{'form.command'} eq 'release') {
500: &release_slot($r,$symb);
501: } elsif ($env{'form.command'} eq 'get') {
502: &get_slot($r,$symb);
503: } elsif ($env{'form.command'} eq 'change') {
504: &release_slot($r,$symb,$env{'form.releaseslot'},1);
505: &get_slot($r,$symb);
506: }
507: &end_page($r);
508: return OK;
509: }
510:
511: 1;
512: __END__
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