1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.120 2007/08/28 01:06:15 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::lonuserstate;
31:
32: # ------------------------------------------------- modules used by this module
33: use strict;
34: use HTML::TokeParser;
35: use Apache::lonnet;
36: use Apache::lonlocal;
37: use Apache::loncommon();
38: use GDBM_File;
39: use Apache::lonmsg;
40: use Safe;
41: use Safe::Hole;
42: use Opcode;
43: use Apache::lonenc;
44: use Fcntl qw(:flock);
45: use LONCAPA;
46:
47:
48: # ---------------------------------------------------- Globals for this package
49:
50: my $pc; # Package counter
51: my %hash; # The big tied hash
52: my %parmhash;# The hash with the parameters
53: my @cond; # Array with all of the conditions
54: my $errtext; # variable with all errors
55: my $retfrid; # variable with the very first RID in the course
56: my $retfurl; # first URL
57: my %randompick; # randomly picked resources
58: my %randompickseed; # optional seed for randomly picking resources
59: my %encurl; # URLs in this folder are supposed to be encrypted
60: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
61:
62: # ----------------------------------- Remove version from URL and store in hash
63:
64: sub versiontrack {
65: my $uri=shift;
66: if ($uri=~/\.(\d+)\.\w+$/) {
67: my $version=$1;
68: $uri=~s/\.\d+\.(\w+)$/\.$1/;
69: unless ($hash{'version_'.$uri}) {
70: $hash{'version_'.$uri}=$version;
71: }
72: }
73: return $uri;
74: }
75:
76: # -------------------------------------------------------------- Put in version
77:
78: sub putinversion {
79: my $uri=shift;
80: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
81: if ($hash{'version_'.$uri}) {
82: my $version=$hash{'version_'.$uri};
83: if ($version eq 'mostrecent') { return $uri; }
84: if ($version eq &Apache::lonnet::getversion(
85: &Apache::lonnet::filelocation('',$uri)))
86: { return $uri; }
87: $uri=~s/\.(\w+)$/\.$version\.$1/;
88: }
89: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
90: return $uri;
91: }
92:
93: # ----------------------------------------- Processing versions file for course
94:
95: sub processversionfile {
96: my %cenv=@_;
97: my %versions=&Apache::lonnet::dump('resourceversions',
98: $cenv{'domain'},
99: $cenv{'num'});
100: foreach my $ver (keys(%versions)) {
101: if ($ver=~/^error\:/) { return; }
102: $hash{'version_'.$ver}=$versions{$ver};
103: }
104: }
105:
106: # --------------------------------------------------------- Loads map from disk
107:
108: sub loadmap {
109: my $uri=shift;
110: if ($hash{'map_pc_'.$uri}) {
111: $errtext.='<p class="LC_error">'.
112: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
113: '</p>';
114: return;
115: }
116: $pc++;
117: my $lpc=$pc;
118: $hash{'map_pc_'.$uri}=$lpc;
119: $hash{'map_id_'.$lpc}=$uri;
120:
121: # Determine and check filename
122: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
123:
124: my $ispage=($fn=~/\.page$/);
125:
126: unless (($fn=~/\.sequence$/) ||
127: ($fn=~/\.page$/)) {
128: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
129: return;
130: }
131:
132: my $instr=&Apache::lonnet::getfile($fn);
133:
134: unless ($instr eq -1) {
135:
136: # Successfully got file, parse it
137:
138: my $parser = HTML::TokeParser->new(\$instr);
139: $parser->attr_encoded(1);
140: my $token;
141:
142: my $linkpc=0;
143:
144: $fn=~/\.(\w+)$/;
145:
146: $hash{'map_type_'.$lpc}=$1;
147:
148: while ($token = $parser->get_token) {
149: if ($token->[0] eq 'S') {
150: if ($token->[1] eq 'resource') {
151: # -------------------------------------------------------------------- Resource
152: if ($token->[2]->{'type'} eq 'zombie') { next; }
153: my $rid=$lpc.'.'.$token->[2]->{'id'};
154:
155: $hash{'kind_'.$rid}='res';
156: $hash{'title_'.$rid}=$token->[2]->{'title'};
157: my $turi=&versiontrack($token->[2]->{'src'});
158: if ($token->[2]->{'version'}) {
159: unless ($hash{'version_'.$turi}) {
160: $hash{'version_'.$turi}=$1;
161: }
162: }
163: my $title=$token->[2]->{'title'};
164: $title=~s/\&colon\;/\:/gs;
165: # my $symb=&Apache::lonnet::encode_symb($uri,
166: # $token->[2]->{'id'},
167: # $turi);
168: # &Apache::lonnet::do_cache_new('title',$symb,$title);
169: unless ($ispage) {
170: $turi=~/\.(\w+)$/;
171: my $embstyle=&Apache::loncommon::fileembstyle($1);
172: if ($token->[2]->{'external'} eq 'true') { # external
173: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
174: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
175: if (($embstyle eq 'img')
176: || ($embstyle eq 'emb')
177: || ($embstyle eq 'wrp')) {
178: $turi='/adm/wrapper'.$turi;
179: } elsif ($embstyle eq 'ssi') {
180: #do nothing with these
181: } elsif ($turi!~/\.(sequence|page)$/) {
182: $turi='/adm/coursedocs/showdoc'.$turi;
183: }
184: } elsif ($turi=~/\S/) { # normal non-empty internal resource
185: my $mapdir=$uri;
186: $mapdir=~s/[^\/]+$//;
187: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
188: if (($embstyle eq 'img')
189: || ($embstyle eq 'emb')
190: || ($embstyle eq 'wrp')) {
191: $turi='/adm/wrapper'.$turi;
192: }
193: }
194: }
195: # Store reverse lookup, remove query string
196: my $idsuri=$turi;
197: $idsuri=~s/\?.+$//;
198: if (defined($hash{'ids_'.$idsuri})) {
199: $hash{'ids_'.$idsuri}.=','.$rid;
200: } else {
201: $hash{'ids_'.$idsuri}=''.$rid;
202: }
203:
204: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
205: $turi.='?register=1';
206: }
207:
208: $hash{'src_'.$rid}=$turi;
209:
210: if ($token->[2]->{'external'} eq 'true') {
211: $hash{'ext_'.$rid}='true:';
212: } else {
213: $hash{'ext_'.$rid}='false:';
214: }
215: if ($token->[2]->{'type'}) {
216: $hash{'type_'.$rid}=$token->[2]->{'type'};
217: if ($token->[2]->{'type'} eq 'start') {
218: $hash{'map_start_'.$uri}="$rid";
219: }
220: if ($token->[2]->{'type'} eq 'finish') {
221: $hash{'map_finish_'.$uri}="$rid";
222: }
223: } else {
224: $hash{'type_'.$rid}='normal';
225: }
226:
227: if (($turi=~/\.sequence$/) ||
228: ($turi=~/\.page$/)) {
229: $hash{'is_map_'.$rid}=1;
230: &loadmap($turi);
231: }
232:
233: } elsif ($token->[1] eq 'condition') {
234: # ------------------------------------------------------------------- Condition
235:
236: my $rid=$lpc.'.'.$token->[2]->{'id'};
237:
238: $hash{'kind_'.$rid}='cond';
239: $cond[$#cond+1]=$token->[2]->{'value'};
240: $hash{'condid_'.$rid}=$#cond;
241: if ($token->[2]->{'type'}) {
242: $cond[$#cond].=':'.$token->[2]->{'type'};
243: } else {
244: $cond[$#cond].=':normal';
245: }
246:
247: } elsif ($token->[1] eq 'link') {
248: # ----------------------------------------------------------------------- Links
249:
250: $linkpc++;
251: my $linkid=$lpc.'.'.$linkpc;
252:
253: my $goesto=$lpc.'.'.$token->[2]->{'to'};
254: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
255: my $undercond=0;
256:
257: if ($token->[2]->{'condition'}) {
258: $undercond=$lpc.'.'.$token->[2]->{'condition'};
259: }
260:
261: $hash{'goesto_'.$linkid}=$goesto;
262: $hash{'comesfrom_'.$linkid}=$comesfrom;
263: $hash{'undercond_'.$linkid}=$undercond;
264:
265: if (defined($hash{'to_'.$comesfrom})) {
266: $hash{'to_'.$comesfrom}.=','.$linkid;
267: } else {
268: $hash{'to_'.$comesfrom}=''.$linkid;
269: }
270: if (defined($hash{'from_'.$goesto})) {
271: $hash{'from_'.$goesto}.=','.$linkid;
272: } else {
273: $hash{'from_'.$goesto}=''.$linkid;
274: }
275: } elsif ($token->[1] eq 'param') {
276: # ------------------------------------------------------------------- Parameter
277:
278: my $referid=$lpc.'.'.$token->[2]->{'to'};
279: my $name=$token->[2]->{'name'};
280: my $part;
281: if ($name=~/^parameter_(.*)_/) {
282: $part=$1;
283: } else {
284: $part=0;
285: }
286: $name=~s/^.*_([^_]*)$/$1/;
287: my $newparam=
288: &escape($token->[2]->{'type'}).':'.
289: &escape($part.'.'.$name).'='.
290: &escape($token->[2]->{'value'});
291: if (defined($hash{'param_'.$referid})) {
292: $hash{'param_'.$referid}.='&'.$newparam;
293: } else {
294: $hash{'param_'.$referid}=''.$newparam;
295: }
296: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
297: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
298: }
299: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
300: $randompick{$referid}=$token->[2]->{'value'};
301: }
302: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
303: $randompickseed{$referid}=$token->[2]->{'value'};
304: }
305: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
306: if ($token->[2]->{'value'}=~/^yes$/i) {
307: $encurl{$referid}=1;
308: }
309: }
310: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
311: if ($token->[2]->{'value'}=~/^yes$/i) {
312: $hiddenurl{$referid}=1;
313: }
314: }
315: }
316:
317: }
318: }
319:
320: } else {
321: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
322: }
323: }
324:
325: # --------------------------------------------------------- Simplify expression
326:
327: sub simplify {
328: my $expression=shift;
329: # (0&1) = 1
330: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
331: # (8)=8
332: $expression=~s/\(([_\.\d]+)\)/$1/g;
333: # 8&8=8
334: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
335: # 8|8=8
336: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
337: # (5&3)&4=5&3&4
338: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
339: # (((5&3)|(4&6)))=((5&3)|(4&6))
340: $expression=~
341: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
342: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
343: $expression=~
344: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
345: return $expression;
346: }
347:
348: # -------------------------------------------------------- Build condition hash
349:
350: sub traceroute {
351: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
352: my $newsofar=$sofar=simplify($sofar);
353: unless ($beenhere=~/\&\Q$rid\E\&/) {
354: $beenhere.=$rid.'&';
355: my ($mapid,$resid)=split(/\./,$rid);
356: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
357: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
358:
359: if ($hdnflag || lc($hidden) eq 'yes') {
360: $hiddenurl{$rid}=1;
361: }
362: if (!$hdnflag && lc($hidden) eq 'no') {
363: delete($hiddenurl{$rid});
364: }
365:
366: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
367: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
368: if (($retfrid eq '') && ($hash{'src_'.$rid})
369: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
370: $retfrid=$rid;
371: }
372: if (defined($hash{'conditions_'.$rid})) {
373: $hash{'conditions_'.$rid}=simplify(
374: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
375: } else {
376: $hash{'conditions_'.$rid}=$sofar;
377: }
378:
379: # if the expression is just the 0th condition keep it
380: # otherwise leave a pointer to this condition expression
381: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
382:
383: if (defined($hash{'is_map_'.$rid})) {
384: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
385: $sofar=$newsofar=
386: &traceroute($sofar,
387: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
388: $encflag || $encurl{$rid},
389: $hdnflag || $hiddenurl{$rid});
390: }
391: }
392: if (defined($hash{'to_'.$rid})) {
393: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
394: my $further=$sofar;
395: if ($hash{'undercond_'.$id}) {
396: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
397: $further=simplify('('.'_'.$rid.')&('.
398: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
399: } else {
400: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
401: }
402: }
403: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
404: $encflag,$hdnflag);
405: }
406: }
407: }
408: return $newsofar;
409: }
410:
411: # ------------------------------ Cascading conditions, quick access, parameters
412:
413: sub accinit {
414: my ($uri,$short,$fn)=@_;
415: my %acchash=();
416: my %captured=();
417: my $condcounter=0;
418: $acchash{'acc.cond.'.$short.'.0'}=0;
419: foreach my $key (keys(%hash)) {
420: if ($key=~/^conditions/) {
421: my $expr=$hash{$key};
422: # try to find and factor out common sub-expressions
423: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
424: my $orig=$sub;
425:
426: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
427: next if (!defined($factor));
428:
429: $sub=~s/\Q$factor\E//g;
430: $sub=~s/^\(/\($factor\(/;
431: $sub.=')';
432: $sub=simplify($sub);
433: $expr=~s/\Q$orig\E/$sub/;
434: }
435: $hash{$key}=$expr;
436: unless (defined($captured{$expr})) {
437: $condcounter++;
438: $captured{$expr}=$condcounter;
439: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
440: }
441: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
442: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
443: $hash{'src_'.$1.'.'.$2});
444: foreach my $param (split(/\&/,$hash{$key})) {
445: my ($typename,$value)=split(/\=/,$param);
446: my ($type,$name)=split(/\:/,$typename);
447: $parmhash{$prefix.'.'.&unescape($name)}=
448: &unescape($value);
449: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
450: &unescape($type);
451: }
452: }
453: }
454: foreach my $key (keys(%hash)) {
455: if ($key=~/^ids/) {
456: foreach my $resid (split(/\,/,$hash{$key})) {
457: my $uri=$hash{'src_'.$resid};
458: my ($uripath,$urifile) =
459: &Apache::lonnet::split_uri_for_cond($uri);
460: if ($uripath) {
461: my $uricond='0';
462: if (defined($hash{'conditions_'.$resid})) {
463: $uricond=$captured{$hash{'conditions_'.$resid}};
464: }
465: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
466: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
467: /(\&\Q$urifile\E\:[^\&]*)/) {
468: my $replace=$1;
469: my $regexp=$replace;
470: #$regexp=~s/\|/\\\|/g;
471: $acchash{'acc.res.'.$short.'.'.$uripath} =~
472: s/\Q$regexp\E/$replace\|$uricond/;
473: } else {
474: $acchash{'acc.res.'.$short.'.'.$uripath}.=
475: $urifile.':'.$uricond.'&';
476: }
477: } else {
478: $acchash{'acc.res.'.$short.'.'.$uripath}=
479: '&'.$urifile.':'.$uricond.'&';
480: }
481: }
482: }
483: }
484: }
485: $acchash{'acc.res.'.$short.'.'}='&:0&';
486: my $courseuri=$uri;
487: $courseuri=~s/^\/res\///;
488: &Apache::lonnet::delenv('(acc\.|httpref\.)');
489: &Apache::lonnet::appenv(%acchash);
490: }
491:
492: # ---------------- Selectively delete from randompick maps and hidden url parms
493:
494: sub hiddenurls {
495: my $randomoutentry='';
496: foreach my $rid (keys %randompick) {
497: my $rndpick=$randompick{$rid};
498: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
499: # ------------------------------------------- put existing resources into array
500: my @currentrids=();
501: foreach my $key (sort(keys(%hash))) {
502: if ($key=~/^src_($mpc\.\d+)/) {
503: if ($hash{'src_'.$1}) { push @currentrids, $1; }
504: }
505: }
506: # rids are number.number and we want to numercially sort on
507: # the second number
508: @currentrids=sort {
509: my (undef,$aid)=split(/\./,$a);
510: my (undef,$bid)=split(/\./,$b);
511: $aid <=> $bid;
512: } @currentrids;
513: next if ($#currentrids<$rndpick);
514: # -------------------------------- randomly eliminate the ones that should stay
515: my (undef,$id)=split(/\./,$rid);
516: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
517: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
518: &Apache::lonnet::setup_random_from_rndseed($rndseed);
519: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
520: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
521: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
522: # -------------------------------------------------------- delete the leftovers
523: for (my $k=0; $k<=$#currentrids; $k++) {
524: if ($currentrids[$k]) {
525: $hash{'randomout_'.$currentrids[$k]}=1;
526: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
527: $randomoutentry.='&'.
528: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
529: $resid,
530: $hash{'src_'.$currentrids[$k]}
531: ).'&';
532: }
533: }
534: }
535: # ------------------------------ take care of explicitly hidden urls or folders
536: foreach my $rid (keys %hiddenurl) {
537: $hash{'randomout_'.$rid}=1;
538: my ($mapid,$resid)=split(/\./,$rid);
539: $randomoutentry.='&'.
540: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
541: $hash{'src_'.$rid}).'&';
542: }
543: # --------------------------------------- append randomout entry to environment
544: if ($randomoutentry) {
545: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
546: }
547: }
548:
549: # ---------------------------------------------------- Read map and all submaps
550:
551: sub readmap {
552: my $short=shift;
553: $short=~s/^\///;
554: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
555: my $fn=$cenv{'fn'};
556: my $uri;
557: $short=~s/\//\_/g;
558: unless ($uri=$cenv{'url'}) {
559: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
560: "Could not load course $short.</font>");
561: return ('',&mt('No course data available.'));;
562: }
563: @cond=('true:normal');
564:
565: open(LOCKFILE,">$fn.db.lock");
566: my $lock=0;
567: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
568: $lock=1;
569: unlink($fn.'.db');
570: unlink($fn.'_symb.db');
571: unlink($fn.'.state');
572: unlink($fn.'parms.db');
573: }
574: undef %randompick;
575: undef %hiddenurl;
576: undef %encurl;
577: $retfrid='';
578: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
579: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
580: %hash=();
581: %parmhash=();
582: $errtext='';
583: $pc=0;
584: &processversionfile(%cenv);
585: my $furi=&Apache::lonnet::clutter($uri);
586: $hash{'src_0.0'}=&versiontrack($furi);
587: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
588: $hash{'ids_'.$furi}='0.0';
589: $hash{'is_map_0.0'}=1;
590: loadmap($uri);
591: if (defined($hash{'map_start_'.$uri})) {
592: &Apache::lonnet::appenv("request.course.id" => $short,
593: "request.course.fn" => $fn,
594: "request.course.uri" => $uri);
595: $env{'request.course.id'}=$short;
596: &traceroute('0',$hash{'map_start_'.$uri},'&');
597: &accinit($uri,$short,$fn);
598: &hiddenurls();
599: }
600: # ------------------------------------------------------- Put versions into src
601: foreach my $key (keys(%hash)) {
602: if ($key=~/^src_/) {
603: $hash{$key}=&putinversion($hash{$key});
604: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
605: my ($type, $url) = ($1,$2);
606: my $value = $hash{$key};
607: $hash{$type.&putinversion($url)}=$value;
608: }
609: }
610: # ---------------------------------------------------------------- Encrypt URLs
611: foreach my $id (keys(%encurl)) {
612: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
613: $hash{'encrypted_'.$id}=1;
614: }
615: # ----------------------------------------------- Close hashes to finally store
616: # --------------------------------- Routine must pass this point, no early outs
617: $hash{'first_rid'}=$retfrid;
618: my ($mapid,$resid)=split(/\./,$retfrid);
619: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
620: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
621: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
622: if ($hash{'encrypted_'.$retfrid}) {
623: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
624: }
625: $hash{'first_url'}=$retfurl;
626: unless ((untie(%hash)) && (untie(%parmhash))) {
627: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
628: "Could not untie coursemap $fn for $uri.</font>");
629: }
630: # ---------------------------------------------------- Store away initial state
631: {
632: my $cfh;
633: if (open($cfh,">$fn.state")) {
634: print $cfh join("\n",@cond);
635: } else {
636: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
637: "Could not write statemap $fn for $uri.</font>");
638: }
639: }
640: flock(LOCKFILE,LOCK_UN);
641: close(LOCKFILE);
642: } else {
643: # if we are here it is likely because we are already trying to
644: # initialize the course in another child, busy wait trying to
645: # tie the hashes for the next 90 seconds, if we succeed forward
646: # them on to navmaps, if we fail, throw up the Could not init
647: # course screen
648: if ($lock) {
649: # Got the lock but not the DB files
650: flock(LOCKFILE,LOCK_UN);
651: }
652: untie(%hash);
653: untie(%parmhash);
654: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
655: "Could not tie coursemap $fn for $uri.</font>");
656: my $i=0;
657: while($i<90) {
658: $i++;
659: sleep(1);
660: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
661: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
662: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
663: $retfurl='/adm/navmaps';
664: &Apache::lonnet::appenv("request.course.id" => $short,
665: "request.course.fn" => $fn,
666: "request.course.uri" => $uri);
667: untie(%hash);
668: untie(%parmhash);
669: last;
670: }
671: }
672: untie(%hash);
673: untie(%parmhash);
674: }
675: flock(LOCKFILE,LOCK_UN);
676: close(LOCKFILE);
677: }
678: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
679: # ------------------------------------------------- Check for critical messages
680:
681: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
682: $env{'user.name'});
683: if ($what[0]) {
684: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
685: $retfurl='/adm/email?critical=display';
686: }
687: }
688: return ($retfurl,$errtext);
689: }
690:
691: # ------------------------------------------------------- Evaluate state string
692:
693: sub evalstate {
694: my $fn=$env{'request.course.fn'}.'.state';
695: my $state='';
696: if (-e $fn) {
697: my @conditions=();
698: {
699: open(my $fh,"<$fn");
700: @conditions=<$fh>;
701: close($fh);
702: }
703: my $safeeval = new Safe;
704: my $safehole = new Safe::Hole;
705: $safeeval->permit("entereval");
706: $safeeval->permit(":base_math");
707: $safeeval->deny(":base_io");
708: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
709: foreach my $line (@conditions) {
710: chomp($line);
711: my ($condition,$weight)=split(/\:/,$line);
712: if ($safeeval->reval($condition)) {
713: if ($weight eq 'force') {
714: $state.='3';
715: } else {
716: $state.='2';
717: }
718: } else {
719: if ($weight eq 'stop') {
720: $state.='0';
721: } else {
722: $state.='1';
723: }
724: }
725: }
726: }
727: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
728: return $state;
729: }
730:
731: 1;
732: __END__
733:
734: =head1 NAME
735:
736: Apache::lonuserstate - Construct and maintain state and binary representation
737: of course for user
738:
739: =head1 SYNOPSIS
740:
741: Invoked by lonroles.pm.
742:
743: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
744:
745: =head1 INTRODUCTION
746:
747: This module constructs and maintains state and binary representation
748: of course for user.
749:
750: This is part of the LearningOnline Network with CAPA project
751: described at http://www.lon-capa.org.
752:
753: =head1 HANDLER SUBROUTINE
754:
755: There is no handler subroutine.
756:
757: =head1 OTHER SUBROUTINES
758:
759: =over 4
760:
761: =item *
762:
763: loadmap() : Loads map from disk
764:
765: =item *
766:
767: simplify() : Simplify expression
768:
769: =item *
770:
771: traceroute() : Build condition hash
772:
773: =item *
774:
775: accinit() : Cascading conditions, quick access, parameters
776:
777: =item *
778:
779: readmap() : Read map and all submaps
780:
781: =item *
782:
783: evalstate() : Evaluate state string
784:
785: =back
786:
787: =cut
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonuserstate.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat