1: # The LearningOnline Network with CAPA
2: # (Publication Handler
3: #
4: # $Id: loncoursedata.pm,v 1.5 2002/07/25 19:31:32 minaeibi 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: =pod
31:
32: =head1 NAME
33:
34: loncoursedata
35:
36: =head1 SYNOPSIS
37:
38: Set of functions that download and process student information.
39:
40: =head1 PACKAGES USED
41:
42: Apache::Constants qw(:common :http)
43: Apache::lonnet()
44: HTML::TokeParser
45: GDBM_File
46:
47: =cut
48:
49: package Apache::loncoursedata;
50:
51: use strict;
52: use Apache::Constants qw(:common :http);
53: use Apache::lonnet();
54: use HTML::TokeParser;
55: use GDBM_File;
56:
57: =pod
58:
59: =head1 DOWNLOAD INFORMATION
60:
61: This section contains all the files that get data from other servers
62: and/or itself. There is one function that has a call to get remote
63: information but isn't included here which is ProcessTopLevelMap. The
64: usage was small enough to be ignored, but that portion may be moved
65: here in the future.
66:
67: =cut
68:
69: # ----- DOWNLOAD INFORMATION -------------------------------------------
70:
71: =pod
72:
73: =item &DownloadClasslist()
74:
75: Collects lastname, generation, middlename, firstname, PID, and section for each
76: student from their environment database. The list of students is built from
77: collecting a classlist for the course that is to be displayed.
78:
79: =over 4
80:
81: Input: $courseID, $c
82:
83: $courseID: The id of the course
84:
85: $c: The connection class that can determine if the browser has aborted. It
86: is used to short circuit this function so that it doesn't continue to
87: get information when there is no need.
88:
89: Output: \%classlist
90:
91: \%classlist: A pointer to a hash containing the following data:
92:
93: -A list of student name:domain (as keys) (known below as $name)
94:
95: -A hash pointer for each student containing lastname, generation, firstname,
96: middlename, and PID : Key is $name.'studentInformation'
97:
98: -A hash pointer to each students section data : Key is $name.section
99:
100: =back
101:
102: =cut
103:
104: sub DownloadClasslist {
105: my ($courseID, $lastDownloadTime, $c)=@_;
106: my ($courseDomain,$courseNumber)=split(/\_/,$courseID);
107: my %classlist;
108:
109: # my $modifiedTime = &GetFileTimestamp($courseDomain, $courseNumber,
110: # 'classlist.db',
111: # $Apache::lonnet::perlvar{'lonUsersDir'});
112:
113: # if($lastDownloadTime ne 'Not downloaded' &&
114: # $lastDownloadTime >= $modifiedTime && $modifiedTime >= 0) {
115: # $classlist{'lastDownloadTime'}=time;
116: # $classlist{'UpToDate'} = 'true';
117: # return \%classlist;
118: # }
119:
120: %classlist=&Apache::lonnet::dump('classlist',$courseDomain, $courseNumber);
121: my ($checkForError)=keys (%classlist);
122: if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
123: return \%classlist;
124: }
125:
126: foreach my $name (keys(%classlist)) {
127: if($c->aborted()) {
128: $classlist{'error'}='aborted';
129: return \%classlist;
130: }
131:
132: my ($studentName,$studentDomain) = split(/\:/,$name);
133: # Download student environment data, specifically the full name and id.
134: my %studentInformation=&Apache::lonnet::get('environment',
135: ['lastname','generation',
136: 'firstname','middlename',
137: 'id'],
138: $studentDomain,
139: $studentName);
140: $classlist{$name.':studentInformation'}=\%studentInformation;
141:
142: if($c->aborted()) {
143: $classlist{'error'}='aborted';
144: return \%classlist;
145: }
146:
147: #Section
148: my %section=&Apache::lonnet::dump('roles',$studentDomain,$studentName);
149: $classlist{$name.':sections'}=\%section;
150: }
151:
152: $classlist{'UpToDate'} = 'false';
153: $classlist{'lastDownloadTime'}=time;
154:
155: return \%classlist;
156: }
157:
158: =pod
159:
160: =item &DownloadCourseInformation()
161:
162: Dump of all the course information for a single student. There is no
163: pruning of data, it is all stored in a hash and returned. It also
164: checks the timestamp of the students course database file and only downloads
165: if it has been modified since the last download.
166:
167: =over 4
168:
169: Input: $name, $courseID
170:
171: $name: student name:domain
172:
173: $courseID: The id of the course
174:
175: Output: \%courseData
176:
177: \%courseData: A hash pointer to the raw data from the student's course
178: database.
179:
180: =back
181:
182: =cut
183:
184: sub DownloadCourseInformation {
185: my ($namedata,$courseID,$lastDownloadTime)=@_;
186: my %courseData;
187: my ($name,$domain) = split(/\:/,$namedata);
188:
189: # my $modifiedTime = &GetFileTimestamp($domain, $name,
190: # $courseID.'.db',
191: # $Apache::lonnet::perlvar{'lonUsersDir'});
192: # if($lastDownloadTime >= $modifiedTime) {
193: # $courseData{'lastDownloadTime'}=time;
194: # $courseData{'UpToDate'} = 'true';
195: # return \%courseData;
196: # }
197:
198: # Download course data
199: %courseData=&Apache::lonnet::dump($courseID, $domain, $name);
200: $courseData{'UpToDate'} = 'false';
201: $courseData{'lastDownloadTime'}=time;
202: return \%courseData;
203: }
204:
205: # ----- END DOWNLOAD INFORMATION ---------------------------------------
206:
207: =pod
208:
209: =head1 PROCESSING FUNCTIONS
210:
211: These functions process all the data for all the students. Also, they
212: are the only functions that access the cache database for writing. Thus
213: they are the only functions that cache data. The downloading and caching
214: were separated to reduce problems with stopping downloading then can't
215: tie hash to database later.
216:
217: =cut
218:
219: # ----- PROCESSING FUNCTIONS ---------------------------------------
220:
221: =pod
222:
223: =item &ProcessTopResourceMap()
224:
225: Trace through the "big hash" created in rat/lonuserstate.pm::loadmap.
226: Basically, this function organizes a subset of the data and stores it in
227: cached data. The data stored is the problems, sequences, sequence titles,
228: parts of problems, and their ordering. Column width information is also
229: partially handled here on a per sequence basis.
230:
231: =over 4
232:
233: Input: $cache, $c
234:
235: $cache: A pointer to a hash to store the information
236:
237: $c: The connection class used to determine if an abort has been sent to the
238: browser
239:
240: Output: A string that contains an error message or "OK" if everything went
241: smoothly.
242:
243: =back
244:
245: =cut
246:
247: sub ProcessTopResourceMap {
248: my ($cache,$c)=@_;
249: my %hash;
250: my $fn=$ENV{'request.course.fn'};
251: if(-e "$fn.db") {
252: my $tieTries=0;
253: while($tieTries < 3) {
254: if($c->aborted()) {
255: return;
256: }
257: if(tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
258: last;
259: }
260: $tieTries++;
261: sleep 1;
262: }
263: if($tieTries >= 3) {
264: return 'Coursemap undefined.';
265: }
266: } else {
267: return 'Can not open Coursemap.';
268: }
269:
270: # Initialize state machine. Set information pointing to top level map.
271: my (@sequences, @currentResource, @finishResource);
272: my ($currentSequence, $currentResourceID, $lastResourceID);
273:
274: $currentResourceID=$hash{'ids_/res/'.$ENV{'request.course.uri'}};
275: push(@currentResource, $currentResourceID);
276: $lastResourceID=-1;
277: $currentSequence=-1;
278: my $topLevelSequenceNumber = $currentSequence;
279:
280: while(1) {
281: if($c->aborted()) {
282: last;
283: }
284: # HANDLE NEW SEQUENCE!
285: #if page || sequence
286: if(defined($hash{'map_pc_'.$hash{'src_'.$currentResourceID}})) {
287: push(@sequences, $currentSequence);
288: push(@currentResource, $currentResourceID);
289: push(@finishResource, $lastResourceID);
290:
291: $currentSequence=$hash{'map_pc_'.$hash{'src_'.$currentResourceID}};
292:
293: # Mark sequence as containing problems. If it doesn't, then
294: # it will be removed when processing for this sequence is
295: # complete. This allows the problems in a sequence
296: # to be outputed before problems in the subsequences
297: if(!defined($cache->{'orderedSequences'})) {
298: $cache->{'orderedSequences'}=$currentSequence;
299: } else {
300: $cache->{'orderedSequences'}.=':'.$currentSequence;
301: }
302:
303: $lastResourceID=$hash{'map_finish_'.
304: $hash{'src_'.$currentResourceID}};
305: $currentResourceID=$hash{'map_start_'.
306: $hash{'src_'.$currentResourceID}};
307:
308: if(!($currentResourceID) || !($lastResourceID)) {
309: $currentSequence=pop(@sequences);
310: $currentResourceID=pop(@currentResource);
311: $lastResourceID=pop(@finishResource);
312: if($currentSequence eq $topLevelSequenceNumber) {
313: last;
314: }
315: }
316: }
317:
318: # Handle gradable resources: exams, problems, etc
319: $currentResourceID=~/(\d+)\.(\d+)/;
320: my $partA=$1;
321: my $partB=$2;
322: if($hash{'src_'.$currentResourceID}=~
323: /\.(problem|exam|quiz|assess|survey|form)$/ &&
324: $partA eq $currentSequence) {
325: my $Problem = &Apache::lonnet::symbclean(
326: &Apache::lonnet::declutter($hash{'map_id_'.$partA}).
327: '___'.$partB.'___'.
328: &Apache::lonnet::declutter($hash{'src_'.
329: $currentResourceID}));
330:
331: $cache->{$currentResourceID.':problem'}=$Problem;
332: if(!defined($cache->{$currentSequence.':problems'})) {
333: $cache->{$currentSequence.':problems'}=$currentResourceID;
334: } else {
335: $cache->{$currentSequence.':problems'}.=
336: ':'.$currentResourceID;
337: }
338:
339: my $meta=$hash{'src_'.$currentResourceID};
340: # $cache->{$currentResourceID.':title'}=
341: # &Apache::lonnet::metdata($meta,'title');
342: $cache->{$currentResourceID.':title'}=
343: $hash{'title_'.$currentResourceID};
344:
345: # Get Parts for problem
346: foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
347: if($_=~/^stores\_(\d+)\_tries$/) {
348: my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
349: if(!defined($cache->{$currentSequence.':'.
350: $currentResourceID.':parts'})) {
351: $cache->{$currentSequence.':'.$currentResourceID.
352: ':parts'}=$Part;
353: } else {
354: $cache->{$currentSequence.':'.$currentResourceID.
355: ':parts'}.=':'.$Part;
356: }
357: foreach (split(/\,/,
358: &Apache::lonnet::metadata($meta,'packages'))) {
359: if($_=~/^optionresponse\_($Part)\_(\w+)$/) {
360: if(defined($cache->{'OptionResponses'})) {
361: $cache->{'OptionResponses'}.= ':::'.
362: $hash{'src_'.$currentResourceID}.'::'.
363: $hash{'title_'.$currentResourceID}.'::'.
364: $Part.'::'.$Problem;
365: } else {
366: $cache->{'OptionResponses'}=
367: $hash{'src_'.$currentResourceID}.'::'.
368: $hash{'title_'.$currentResourceID}.'::'.
369: $Part.'::'.$Problem;
370: }
371: }
372: }
373: }
374: }
375: }
376:
377: # if resource == finish resource, then it is the end of a sequence/page
378: if($currentResourceID eq $lastResourceID) {
379: # pop off last resource of sequence
380: $currentResourceID=pop(@currentResource);
381: $lastResourceID=pop(@finishResource);
382:
383: if(defined($cache->{$currentSequence.':problems'})) {
384: # Capture sequence information here
385: $cache->{$currentSequence.':title'}=
386: $hash{'title_'.$currentResourceID};
387: $cache->{$currentSequence.':source'}=
388: $hash{'src_'.$currentResourceID};
389:
390: my $totalProblems=0;
391: foreach my $currentProblem (split(/\:/,
392: $cache->{$currentSequence.
393: ':problems'})) {
394: foreach (split(/\:/,$cache->{$currentSequence.':'.
395: $currentProblem.
396: ':parts'})) {
397: $totalProblems++;
398: }
399: }
400: my @titleLength=split(//,$cache->{$currentSequence.
401: ':title'});
402: # $extra is 3 for problems correct and 3 for space
403: # between problems correct and problem output
404: my $extra = 6;
405: if(($totalProblems + $extra) > (scalar @titleLength)) {
406: $cache->{$currentSequence.':columnWidth'}=
407: $totalProblems + $extra;
408: } else {
409: $cache->{$currentSequence.':columnWidth'}=
410: (scalar @titleLength);
411: }
412: } else {
413: # Remove sequence from list, if it contains no problems to
414: # display.
415: $cache->{'orderedSequences'}=~s/$currentSequence//;
416: $cache->{'orderedSequences'}=~s/::/:/g;
417: $cache->{'orderedSequences'}=~s/^:|:$//g;
418: }
419:
420: $currentSequence=pop(@sequences);
421: if($currentSequence eq $topLevelSequenceNumber) {
422: last;
423: }
424: }
425:
426: # MOVE!!!
427: # move to next resource
428: unless(defined($hash{'to_'.$currentResourceID})) {
429: # big problem, need to handle. Next is probably wrong
430: last;
431: }
432: my @nextResources=();
433: foreach (split(/\,/,$hash{'to_'.$currentResourceID})) {
434: push(@nextResources, $hash{'goesto_'.$_});
435: }
436: push(@currentResource, @nextResources);
437: # Set the next resource to be processed
438: $currentResourceID=pop(@currentResource);
439: }
440:
441: unless (untie(%hash)) {
442: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
443: "Could not untie coursemap $fn (browse)".
444: ".</font>");
445: }
446:
447: return 'OK';
448: }
449:
450: =pod
451:
452: =item &ProcessClasslist()
453:
454: Taking the class list dumped from &DownloadClasslist(), all the
455: students and their non-class information is processed using the
456: &ProcessStudentInformation() function. A date stamp is also recorded for
457: when the data was processed.
458:
459: Takes data downloaded for a student and breaks it up into managable pieces and
460: stored in cache data. The username, domain, class related date, PID,
461: full name, and section are all processed here.
462:
463:
464: =over 4
465:
466: Input: $cache, $classlist, $courseID, $ChartDB, $c
467:
468: $cache: A hash pointer to store the data
469:
470: $classlist: The hash of data collected about a student from
471: &DownloadClasslist(). The hash contains a list of students, a pointer
472: to a hash of student information for each student, and each student's section
473: number.
474:
475: $courseID: The course ID
476:
477: $ChartDB: The name of the cache database file.
478:
479: $c: The connection class used to determine if an abort has been sent to the
480: browser
481:
482: Output: @names
483:
484: @names: An array of students whose information has been processed, and are to
485: be considered in an arbitrary order.
486:
487: =back
488:
489: =cut
490:
491: sub ProcessClasslist {
492: my ($cache,$classlist,$courseID,$c)=@_;
493: my @names=();
494:
495: $cache->{'ClasslistTimeStamp'}=$classlist->{'lastDownloadTime'};
496: if($classlist->{'UpToDate'} eq 'true') {
497: return split(/:::/,$cache->{'NamesOfStudents'});;
498: }
499:
500: foreach my $name (keys(%$classlist)) {
501: if($name =~ /\:section/ || $name =~ /\:studentInformation/ ||
502: $name eq '' || $name eq 'UpToDate' || $name eq 'lastDownloadTime') {
503: next;
504: }
505: if($c->aborted()) {
506: return ();
507: }
508: push(@names,$name);
509: my $studentInformation = $classlist->{$name.':studentInformation'},
510: my $sectionData = $classlist->{$name.':sections'},
511: my $date = $classlist->{$name},
512: my ($studentName,$studentDomain) = split(/\:/,$name);
513:
514: $cache->{$name.':username'}=$studentName;
515: $cache->{$name.':domain'}=$studentDomain;
516: if(!defined($cache->{$name.':lastDownloadTime'})) {
517: $cache->{$name.':lastDownloadTime'}='Not downloaded';
518: }
519:
520: my ($checkForError)=keys(%$studentInformation);
521: if($checkForError =~ /^(con_lost|error|no_such_host)/i) {
522: $cache->{$name.':error'}=
523: 'Could not download student environment data.';
524: $cache->{$name.':fullname'}='';
525: $cache->{$name.':id'}='';
526: } else {
527: $cache->{$name.':fullname'}=&ProcessFullName(
528: $studentInformation->{'lastname'},
529: $studentInformation->{'generation'},
530: $studentInformation->{'firstname'},
531: $studentInformation->{'middlename'});
532: $cache->{$name.':id'}=$studentInformation->{'id'};
533: }
534:
535: my ($end, $start)=split(':',$date);
536: $courseID=~s/\_/\//g;
537: $courseID=~s/^(\w)/\/$1/;
538:
539: my $sec='';
540: foreach my $key (keys (%$sectionData)) {
541: my $value = $sectionData->{$key};
542: if ($key=~/^$courseID(?:\/)*(\w+)*\_st$/) {
543: my $tempsection=$1;
544: if($key eq $courseID.'_st') {
545: $tempsection='';
546: }
547: my ($dummy,$roleend,$rolestart)=split(/\_/,$value);
548: if($roleend eq $end && $rolestart eq $start) {
549: $sec = $tempsection;
550: last;
551: }
552: }
553: }
554:
555: my $status='Expired';
556: if(((!$end) || time < $end) && ((!$start) || (time > $start))) {
557: $status='Active';
558: }
559: $cache->{$name.':Status'}=$status;
560: $cache->{$name.':section'}=$sec;
561: }
562:
563: $cache->{'ClasslistTimestamp'}=time;
564: $cache->{'NamesOfStudents'}=join(':::',@names);
565:
566: return @names;
567: }
568:
569: =pod
570:
571: =item &ProcessStudentData()
572:
573: Takes the course data downloaded for a student in
574: &DownloadCourseInformation() and breaks it up into key value pairs
575: to be stored in the cached data. The keys are comprised of the
576: $username:$domain:$keyFromCourseDatabase. The student username:domain is
577: stored away signifying that the student's information has been downloaded and
578: can be reused from cached data.
579:
580: =over 4
581:
582: Input: $cache, $courseData, $name
583:
584: $cache: A hash pointer to store data
585:
586: $courseData: A hash pointer that points to the course data downloaded for a
587: student.
588:
589: $name: username:domain
590:
591: Output: None
592:
593: *NOTE: There is no output, but an error message is stored away in the cache
594: data. This is checked in &FormatStudentData(). The key username:domain:error
595: will only exist if an error occured. The error is an error from
596: &DownloadCourseInformation().
597:
598: =back
599:
600: =cut
601:
602: sub ProcessStudentData {
603: my ($cache,$courseData,$name)=@_;
604:
605: if($courseData->{'UpToDate'} eq 'true') {
606: $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
607: return;
608: }
609:
610: my @courseKeys = keys(%$courseData);
611:
612: foreach (@courseKeys) {
613: if(/^(con_lost|error|no_such_host)/i) {
614: $cache->{$name.':error'}='Could not download course data.';
615: return;
616: }
617: }
618:
619: $cache->{$name.':lastDownloadTime'}=$courseData->{'lastDownloadTime'};
620: foreach (@courseKeys) {
621: $cache->{$name.':'.$_}=$courseData->{$_};
622: }
623:
624: return;
625: }
626:
627: sub LoadDiscussion {
628: my ( $courseID)=@_;
629: my %Discuss=();
630: my %contrib=&Apache::lonnet::dump(
631: $courseID,
632: $ENV{'course.'.$courseID.'.domain'},
633: $ENV{'course.'.$courseID.'.num'});
634:
635: #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
636:
637: foreach my $temp(keys %contrib) {
638: if ($temp=~/^version/) {
639: my $ver=$contrib{$temp};
640: my ($dummy,$prb)=split(':',$temp);
641: for (my $idx=1; $idx<=$ver; $idx++ ) {
642: my $name=$contrib{"$idx:$prb:sendername"};
643: $Discuss{"$name:$prb"}=$idx;
644: }
645: }
646: }
647:
648: return \%Discuss;
649: }
650:
651: # ----- END PROCESSING FUNCTIONS ---------------------------------------
652:
653: =pod
654:
655: =head1 HELPER FUNCTIONS
656:
657: These are just a couple of functions do various odd and end
658: jobs.
659:
660: =cut
661:
662: # ----- HELPER FUNCTIONS -----------------------------------------------
663:
664: =pod
665:
666: =item &ProcessFullName()
667:
668: Takes lastname, generation, firstname, and middlename (or some partial
669: set of this data) and returns the full name version as a string. Format
670: is Lastname generation, firstname middlename or a subset of this.
671:
672: =cut
673:
674: sub ProcessFullName {
675: my ($lastname, $generation, $firstname, $middlename)=@_;
676: my $Str = '';
677:
678: if($lastname ne '') {
679: $Str .= $lastname.' ';
680: if($generation ne '') {
681: $Str .= $generation;
682: } else {
683: chop($Str);
684: }
685: $Str .= ', ';
686: if($firstname ne '') {
687: $Str .= $firstname.' ';
688: }
689: if($middlename ne '') {
690: $Str .= $middlename;
691: } else {
692: chop($Str);
693: if($firstname eq '') {
694: chop($Str);
695: }
696: }
697: } else {
698: if($firstname ne '') {
699: $Str .= $firstname.' ';
700: }
701: if($middlename ne '') {
702: $Str .= $middlename.' ';
703: }
704: if($generation ne '') {
705: $Str .= $generation;
706: } else {
707: chop($Str);
708: }
709: }
710:
711: return $Str;
712: }
713:
714: =pod
715:
716: =item &TestCacheData()
717:
718: Determine if the cache database can be accessed with a tie. It waits up to
719: ten seconds before returning failure. This function exists to help with
720: the problems with stopping the data download. When an abort occurs and the
721: user quickly presses a form button and httpd child is created. This
722: child needs to wait for the other to finish (hopefully within ten seconds).
723:
724: =over 4
725:
726: Input: $ChartDB
727:
728: $ChartDB: The name of the cache database to be opened
729:
730: Output: -1, 0, 1
731:
732: -1: Couldn't tie database
733: 0: Use cached data
734: 1: New cache database created, use that.
735:
736: =back
737:
738: =cut
739:
740: sub TestCacheData {
741: my ($ChartDB,$isRecalculate,$totalDelay)=@_;
742: my $isCached=-1;
743: my %testData;
744: my $tieTries=0;
745:
746: if(!defined($totalDelay)) {
747: $totalDelay = 10;
748: }
749:
750: if ((-e "$ChartDB") && (!$isRecalculate)) {
751: $isCached = 1;
752: } else {
753: $isCached = 0;
754: }
755:
756: while($tieTries < $totalDelay) {
757: my $result=0;
758: if($isCached) {
759: $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_READER,0640);
760: } else {
761: $result=tie(%testData,'GDBM_File',$ChartDB,&GDBM_NEWDB,0640);
762: }
763: if($result) {
764: last;
765: }
766: $tieTries++;
767: sleep 1;
768: }
769: if($tieTries >= $totalDelay) {
770: return -1;
771: }
772:
773: untie(%testData);
774:
775: return $isCached;
776: }
777:
778: sub GetFileTimestamp {
779: my ($studentDomain,$studentName,$filename,$root)=@_;
780: $studentDomain=~s/\W//g;
781: $studentName=~s/\W//g;
782: my $subdir=$studentName.'__';
783: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
784: my $proname="$studentDomain/$subdir/$studentName";
785: $proname .= '/'.$filename;
786: my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
787: $root);
788: my $fileStat = $dir[0];
789: my @stats = split('&', $fileStat);
790: if(@stats) {
791: return $stats[9];
792: } else {
793: return -1;
794: }
795: }
796:
797: # ----- END HELPER FUNCTIONS --------------------------------------------
798:
799: 1;
800: __END__
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