Annotation of loncom/interface/slotrequest.pm, revision 1.9
1.1 albertel 1: # The LearningOnline Network with CAPA
2: # Handler for requesting to have slots added to a students record
3: #
1.9 ! albertel 4: # $Id: slotrequest.pm,v 1.8 2005/08/15 19:54:26 albertel Exp $
1.1 albertel 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)=@_;
1.2 albertel 40: if ($code eq 'not_valid') {
1.8 albertel 41: $r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>');
1.2 albertel 42:
1.8 albertel 43: } elsif ($code eq 'not_allowed') {
44: $r->print('<p>'.&mt('Not allowed to sign up or change reservations at this time.').'</p>');
45: } else {
46: $r->print('<p>'.&mt('Failed.').'</p>');
1.2 albertel 47: }
1.8 albertel 48:
1.2 albertel 49: $r->print('<p><a href="/adm/flip?postdata=return:">'.
50: &mt('Return to last resource').'</a></p>');
1.1 albertel 51: &end_page($r);
52: }
53:
54: sub start_page {
55: my ($r)=@_;
56: my $html=&Apache::lonxml::xmlbegin();
57: $r->print($html.'<head><title>'.
58: &mt('Request another Worktime').'</title></head>');
59: $r->print(&Apache::loncommon::bodytag('Requesting another Worktime'));
60: }
61:
62: sub end_page {
63: my ($r)=@_;
64: $r->print(&Apache::loncommon::endbodytag().'</html>');
65: }
66:
1.2 albertel 67: =pod
68:
69: slot_reservations db
70: - keys are
71: - slotname\0id -> value is an hashref of
72: name -> user@domain of holder
73: timestamp -> timestamp of reservation
74: symb -> symb of resource that it is reserved for
75:
76: =cut
77:
78: sub get_course {
79: (undef,my $courseid)=&Apache::lonxml::whichuser();
80: my $cdom=$env{'course.'.$courseid.'.domain'};
81: my $cnum=$env{'course.'.$courseid.'.num'};
82: return ($cnum,$cdom);
83: }
84:
85: sub get_reservation_ids {
86: my ($slot_name)=@_;
87:
88: my ($cnum,$cdom)=&get_course();
89:
90: my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
91: "^$slot_name\0");
92:
93: my ($tmp)=%consumed;
94: if ($tmp=~/^error: 2 / ) {
95: return 0;
96: }
97: return keys(%consumed);
98: }
99:
100: sub space_available {
101: my ($slot_name,$slot)=@_;
102: my $max=$slot->{'maxspace'};
103:
104: if (!defined($max)) { return 1; }
105:
106: my $consumed=scalar(&get_reservation_ids($slot_name));
107: if ($consumed < $max) {
108: return 1
109: }
110: return 0;
111: }
1.3 albertel 112:
1.4 albertel 113: sub check_for_reservation {
114: my ($symb)=@_;
115: my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
116: $env{'user.domain'}, $env{'user.name'});
117:
118: my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
119: $env{'user.domain'}, $env{'user.name'});
120: my @slots = (split(/:/,$student), split(/:/, $course));
121:
122: &Apache::lonxml::debug(" slot list is ".join(':',@slots));
123:
124: my ($cnum,$cdom)=&get_course();
125: my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
126:
127: foreach my $slot_name (@slots) {
128: next if (!defined($slots{$slot_name}) ||
129: !ref($slots{$slot_name}));
130: &Apache::lonxml::debug(time." $slot_name ".
131: $slots{$slot_name}->{'starttime'}." -- ".
132: $slots{$slot_name}->{'startreserve'});
1.7 albertel 133: if ($slots{$slot_name}->{'endtime'} > time &&
1.4 albertel 134: $slots{$slot_name}->{'startreserve'} < time) {
1.7 albertel 135: # between start of reservation times and end of slot
1.4 albertel 136: return($slot_name, $slots{$slot_name});
137: }
138: }
139: return (undef,undef);
140: }
141:
1.5 albertel 142: sub check_for_conflict {
143: my ($symb,$new_slot_name)=@_;
144: my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
145: $env{'user.domain'}, $env{'user.name'});
146: my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
147: $env{'user.domain'}, $env{'user.name'});
148: my @slots = (split(/:/,$student), split(/:/, $course));
149: my ($cnum,$cdom)=&get_course();
150: my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
151: foreach my $slot_name (@slots) {
152: next if (!defined($slots{$slot_name}) ||
153: !ref($slots{$slot_name}));
154:
155: next if (!defined($slots{$slot_name}->{'uniqueperiod'}) ||
156: !ref($slots{$slot_name}->{'uniqueperiod'}));
157: my ($start,$end)=@{$slots{$slot_name}->{'uniqueperiod'}};
158: if ($start<time && time < $end) {
159: return $slot_name;
160: }
161: }
162: return undef;
163:
164: }
165:
1.2 albertel 166: sub make_reservation {
167: my ($slot_name,$slot,$symb)=@_;
1.3 albertel 168:
169: my ($cnum,$cdom)=&get_course();
170:
171: my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
172: $env{'user.domain'},$env{'user.name'});
173: &Apache::lonxml::debug("value is $value<br />");
174: foreach my $other_slot (split(/:/, $value)) {
175: if ($other_slot eq $slot_name) {
176: my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
177: $cnum, "^$slot_name\0");
178:
179: my $me=$env{'user.name'}.'@'.$env{'user.domain'};
180: foreach my $key (keys(%consumed)) {
181: if ($consumed{$key}->{'name'} eq $me) {
182: my $num=(split('\0',$key))[1];
183: return -$num;
184: }
185: }
186: }
187: }
188:
1.2 albertel 189: my $max=$slot->{'maxspace'};
1.3 albertel 190: if (!defined($max)) { $max=99999; }
1.2 albertel 191:
192: my (@ids)=&get_reservation_ids($slot_name);
193:
194: my $last=0;
195: foreach my $id (@ids) {
196: my $num=(split('\0',$id))[1];
197: if ($num > $last) { $last=$num; }
198: }
199:
200: my $wanted=$last+1;
1.3 albertel 201: &Apache::lonxml::debug("wanted $wanted<br />");
1.7 albertel 202: if (scalar(@ids) >= $max) {
1.2 albertel 203: # full up
1.7 albertel 204: return undef;
1.2 albertel 205: }
206:
207: my %reservation=('name' => $env{'user.name'}.'@'.$env{'user.domain'},
208: 'timestamp' => time,
209: 'symb' => $symb);
210:
211: my $success=&Apache::lonnet::newput('slot_reservations',
212: {"$slot_name\0$wanted" =>
213: \%reservation},
1.3 albertel 214: $cdom, $cnum);
215:
1.2 albertel 216: if ($success eq 'ok') {
1.3 albertel 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");
1.2 albertel 227: return $wanted;
228: }
1.3 albertel 229:
1.2 albertel 230: # someone else got it
1.3 albertel 231: return undef;
232: }
233:
1.5 albertel 234: sub release_slot {
1.6 albertel 235: my ($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:
1.5 albertel 240: # get parameter string, check for existance, rebuild string with the slot
1.6 albertel 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 $new_param = join(':',@new_slots);
1.5 albertel 251:
252: # get slot reservations, check if user has one, if so remove reservation
1.6 albertel 253: my %consumed=&Apache::lonnet::dump('slot_reservations',$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: }
1.5 albertel 262: # store new parameter string
1.6 albertel 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: $description</p>");
1.7 albertel 271: if (!$inhibit_return_link) {
1.6 albertel 272: $r->print('<p><a href="/adm/flip?postdata=return:">'.
273: &mt('Return to last resource').'</a></p>');
274: }
275: return 1;
1.5 albertel 276: }
277:
1.3 albertel 278: sub get_slot {
279: my ($r,$symb)=@_;
280:
1.5 albertel 281: my $slot_name=&check_for_conflict($symb,$env{'form.slotname'});
282: if ($slot_name) {
283: my %slot=&Apache::lonnet::get_slot($slot_name);
1.6 albertel 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: $description1</p>");
1.7 albertel 288: if ($slot_name ne $env{'form.slotname'}) {
289: $r->print(<<STUFF);
1.6 albertel 290: <form method="POST" action="/adm/slotrequest">
291: <input type="hidden" name="symb" value="$env{'form.symb'}" />
292: <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
293: <input type="hidden" name="releaseslot" value="$slot_name" />
294: <input type="hidden" name="command" value="change" />
295: STUFF
1.7 albertel 296: $r->print("<p>You can either ");
297: $r->print(<<STUFF);
1.6 albertel 298: <input type="submit" name="change" value="Change" />
299: STUFF
1.7 albertel 300: $r->print(' your reservation from <b>'.$description1.'</b> to <b>'.
301: $description2.
302: '</b> <br />or <a href="/adm/flip?postdata=return:">'.
303: &mt('Return to last resource').'</a></p>');
304: $r->print(<<STUFF);
1.6 albertel 305: </form>
306: STUFF
1.7 albertel 307: } else {
308: $r->print('<p><a href="/adm/flip?postdata=return:">'.
309: &mt('Return to last resource').'</a></p>');
310: }
1.5 albertel 311: return;
312: }
1.3 albertel 313: my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
314: my $reserved=&make_reservation($env{'form.slotname'},
315: \%slot,$symb);
316: my $description=&get_description($env{'form.slotname'},\%slot);
1.7 albertel 317: if (defined($reserved)) {
318: if ($reserved > -1) {
319: $r->print("<p>Success: $description</p>");
320: $r->print('<p><a href="/adm/flip?postdata=return:">'.
321: &mt('Return to last resource').'</a></p>');
322: return;
323: } elsif ($reserved < 0) {
324: $r->print("<p>Already reserved: $description</p>");
325: $r->print('<p><a href="/adm/flip?postdata=return:">'.
326: &mt('Return to last resource').'</a></p>');
327: return;
328: }
1.3 albertel 329: }
330:
1.7 albertel 331: my %lt=('request'=>"Availibility list",
1.3 albertel 332: 'try' =>'Try again');
333: %lt=&Apache::lonlocal::texthash(%lt);
334:
335: $r->print(<<STUFF);
336: <p> <font color="red">Failed</font> to reserve a spot for $description. </p>
337: <p>
338: <form method="POST" action="/adm/slotrequest">
339: <input type="submit" name="Try Again" value="$lt{'try'}" />
340: <input type="hidden" name="symb" value="$env{'form.symb'}" />
341: <input type="hidden" name="slotname" value="$env{'form.slotname'}" />
342: <input type="hidden" name="command" value="get" />
343: </form>
344: ?
345: </p>
346: <p>
347: or
348: <form method="POST" action="/adm/slotrequest">
349: <input type="hidden" name="symb" value="$env{'form.symb'}" />
350: <input type="submit" name="requestattempt" value="$lt{'request'}" />
351: </form>
352: </p>
353: or
354: STUFF
355: $r->print('<p><a href="/adm/flip?postdata=return:">'.
356: &mt('Return to last resource').'</a></p>');
357: return;
358: }
359:
360: sub allowed_slot {
361: my ($slot_name,$slot,$symb)=@_;
362: #already started
363: if ($slot->{'starttime'} < time) {
1.5 albertel 364: # all open slot to be schedulable
365: #return 0;
1.3 albertel 366: }
1.5 albertel 367: &Apache::lonxml::debug("$slot_name starttime good");
1.3 albertel 368: #already ended
369: if ($slot->{'endtime'} < time) {
370: return 0;
371: }
1.5 albertel 372: &Apache::lonxml::debug("$slot_name endtime good");
1.3 albertel 373: # not allowed to pick this one
374: if (defined($slot->{'type'})
375: && $slot->{'type'} ne 'schedulable_student') {
376: return 0;
377: }
1.5 albertel 378: &Apache::lonxml::debug("$slot_name type good");
1.3 albertel 379: # not allowed for this resource
380: if (defined($slot->{'symb'})
381: && $slot->{'symb'} ne $symb) {
382: return 0;
383: }
1.5 albertel 384: &Apache::lonxml::debug("$slot_name symb good");
1.3 albertel 385: return 1;
1.2 albertel 386: }
387:
1.3 albertel 388: sub get_description {
389: my ($slot_name,$slot)=@_;
390: my $description=$slot->{'description'};
391: if (!defined($description)) {
1.4 albertel 392: $description=&mt('[_1] From [_2] to [_3]',$slot_name,
1.3 albertel 393: &Apache::lonlocal::locallocaltime($slot->{'starttime'}),
394: &Apache::lonlocal::locallocaltime($slot->{'endtime'}));
395: }
396: return $description;
397: }
1.2 albertel 398:
399: sub show_choices {
400: my ($r,$symb)=@_;
401:
402: my ($cnum,$cdom)=&get_course();
403: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
1.3 albertel 404: my $available;
1.2 albertel 405: $r->print('<table border="1">');
1.5 albertel 406: &Apache::lonxml::debug("Checking Slots");
407: my ($got_slot)=&check_for_reservation($symb);
1.2 albertel 408: foreach my $slot (sort
409: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
410: (keys(%slots))) {
1.5 albertel 411:
412: &Apache::lonxml::debug("Checking Slot $slot");
1.3 albertel 413: next if (!&allowed_slot($slot,$slots{$slot}));
414:
415: $available++;
416:
417: my $description=&get_description($slot,$slots{$slot});
1.2 albertel 418:
419: my $form=&mt('Unavailable');
1.7 albertel 420: if (($slot eq $got_slot) ||
421: &space_available($slot,$slots{$slot},$symb)) {
1.5 albertel 422: my $text=&mt('Select');
423: my $command='get';
424: if ($slot eq $got_slot) {
425: $text=&mt('Free Reservation');
426: $command='release';
427: }
1.3 albertel 428: my $escsymb=&Apache::lonnet::escape($symb);
1.2 albertel 429: $form=<<STUFF;
1.3 albertel 430: <form method="POST" action="/adm/slotrequest">
1.5 albertel 431: <input type="submit" name="Select" value="$text" />
1.3 albertel 432: <input type="hidden" name="symb" value="$escsymb" />
433: <input type="hidden" name="slotname" value="$slot" />
1.5 albertel 434: <input type="hidden" name="command" value="$command" />
1.2 albertel 435: </form>
436: STUFF
437: }
438: $r->print(<<STUFF);
439: <tr>
440: <td>$form</td>
441: <td>$description</td>
442: </tr>
443: STUFF
444: }
1.3 albertel 445:
446: if (!$available) {
1.5 albertel 447: $r->print('<tr><td>No available times. <a href="/adm/flip?postdata=return:">'.
1.3 albertel 448: &mt('Return to last resource').'</a></td></tr>');
449: }
1.2 albertel 450: $r->print('</table>');
451: }
452:
1.5 albertel 453: sub show_table {
454: my ($r,$symb)=@_;
455:
456: my ($cnum,$cdom)=&get_course();
457: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
458: my $available;
459: $r->print('<table border="1">');
460: foreach my $slot (sort
461: { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
462: (keys(%slots))) {
463: if (defined($slots{$slot}->{'type'})
464: && $slots{$slot}->{'type'} ne 'schedulable_student') {
465: next;
466: }
467: my $description=&get_description($slot,$slots{$slot});
468: my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
469: "^$slot\0");
470: my $ids;
471: foreach my $entry (sort(keys(%consumed))) {
472: my (undef,$id)=split("\0",$entry);
473: $ids.= $id.'-> '.$consumed{$entry}->{'name'}.'<br />';
474: }
475: my $start=localtime($slots{$slot}->{'starttime'});
476: my $end=localtime($slots{$slot}->{'endtime'});
477: $r->print(<<STUFF);
478: <tr>
479: <td>$slot</td>
480: <td>$description</td>
481: <td>$start</td>
482: <td>$end</td>
483: <td>$slots{$slot}->{'maxspace'}</td>
484: <td>$ids</td>
485: </tr>
486: STUFF
487: }
488: $r->print('</table>');
489: }
490:
1.1 albertel 491: sub handler {
492: my $r=shift;
493:
1.8 albertel 494: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
1.1 albertel 495: &start_page($r);
1.2 albertel 496: my $symb=&Apache::lonnet::unescape($env{'form.symb'});
1.1 albertel 497: my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
1.2 albertel 498: if ($res !~ /\.task$/) {
1.1 albertel 499: &fail($r,'not_valid');
500: return OK;
501: }
1.8 albertel 502: $env{'request.symb'}=$symb;
503: my ($status) = &Apache::lonhomework::check_task_access('0');
504: if ($status eq 'CAN_ANSWER' ||
505: $status eq 'NEEDS_CHECKIN' ||
506: $status eq 'WAITING_FOR_GRADE') {
507: &fail($r,'not_allowed');
508: return OK;
509: }
510: my $vgr=&Apache::lonnet::allowed('vgr',$env{'request.course.id'});
511: if ($env{'form.command'} eq 'showslots' && $vgr eq 'F') {
1.5 albertel 512: &show_table($r,$symb);
513: } elsif ($env{'form.requestattempt'}) {
1.2 albertel 514: &show_choices($r,$symb);
1.5 albertel 515: } elsif ($env{'form.command'} eq 'release') {
516: &release_slot($r,$symb);
1.3 albertel 517: } elsif ($env{'form.command'} eq 'get') {
518: &get_slot($r,$symb);
1.6 albertel 519: } elsif ($env{'form.command'} eq 'change') {
520: &release_slot($r,$symb,$env{'form.releaseslot'},1);
521: &get_slot($r,$symb);
1.8 albertel 522: } else {
523: $r->print("<p>Unknown command: ".$env{'form.command'}."</p>");
1.2 albertel 524: }
1.1 albertel 525: &end_page($r);
526: return OK;
527: }
1.3 albertel 528:
529: 1;
530: __END__
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