1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.87 2005/03/15 19:25:30 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 Apache::Constants qw(:common :http);
35: use Apache::File;
36: use HTML::TokeParser;
37: use Apache::lonnet();
38: use Apache::loncommon();
39: use GDBM_File;
40: use Apache::lonmsg;
41: use Safe;
42: use Safe::Hole;
43: use Opcode;
44: use Apache::lonenc;
45:
46: # ---------------------------------------------------- Globals for this package
47:
48: my $pc; # Package counter
49: my %hash; # The big tied hash
50: my %parmhash;# The hash with the parameters
51: my @cond; # Array with all of the conditions
52: my $errtext; # variable with all errors
53: my $retfurl; # variable with the very first URL in the course
54: my %randompick; # randomly picked resources
55: my %randompickseed; # optional seed for randomly picking resources
56: my %encurl; # URLs in this folder are supposed to be encrypted
57: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
58:
59: # ----------------------------------- Remove version from URL and store in hash
60:
61: sub versiontrack {
62: my $uri=shift;
63: if ($uri=~/\.(\d+)\.\w+$/) {
64: my $version=$1;
65: $uri=~s/\.\d+\.(\w+)$/\.$1/;
66: unless ($hash{'version_'.$uri}) {
67: $hash{'version_'.$uri}=$version;
68: }
69: }
70: return $uri;
71: }
72:
73: # -------------------------------------------------------------- Put in version
74:
75: sub putinversion {
76: my $uri=shift;
77: if ($hash{'version_'.$uri}) {
78: my $version=$hash{'version_'.$uri};
79: if ($version eq 'mostrecent') { return $uri; }
80: if ($version eq &Apache::lonnet::getversion(
81: &Apache::lonnet::filelocation('',$uri)))
82: { return $uri; }
83: $uri=~s/\.(\w+)$/\.$version\.$1/;
84: }
85: return $uri;
86: }
87:
88: # ----------------------------------------- Processing versions file for course
89:
90: sub processversionfile {
91: my %cenv=@_;
92: my %versions=&Apache::lonnet::dump('resourceversions',
93: $cenv{'domain'},
94: $cenv{'num'});
95: foreach (keys %versions) {
96: if ($_=~/^error\:/) { return; }
97: $hash{'version_'.$_}=$versions{$_};
98: }
99: }
100:
101: # --------------------------------------------------------- Loads map from disk
102:
103: sub loadmap {
104: my $uri=shift;
105: if ($hash{'map_pc_'.$uri}) { return OK; }
106:
107: $pc++;
108: my $lpc=$pc;
109: $hash{'map_pc_'.$uri}=$lpc;
110: $hash{'map_id_'.$lpc}=$uri;
111:
112: # Determine and check filename
113: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
114:
115: my $ispage=($fn=~/\.page$/);
116:
117: unless (($fn=~/\.sequence$/) ||
118: ($fn=~/\.page$/)) {
119: $errtext.="Invalid map: $fn\n";
120: return OK;
121: }
122:
123: my $instr=&Apache::lonnet::getfile($fn);
124:
125: unless ($instr eq -1) {
126:
127: # Successfully got file, parse it
128:
129: my $parser = HTML::TokeParser->new(\$instr);
130: my $token;
131:
132: my $linkpc=0;
133:
134: $fn=~/\.(\w+)$/;
135:
136: $hash{'map_type_'.$lpc}=$1;
137:
138: while ($token = $parser->get_token) {
139: if ($token->[0] eq 'S') {
140: if ($token->[1] eq 'resource') {
141: # -------------------------------------------------------------------- Resource
142:
143: my $rid=$lpc.'.'.$token->[2]->{'id'};
144:
145: $hash{'kind_'.$rid}='res';
146: $hash{'title_'.$rid}=$token->[2]->{'title'};
147: my $turi=&versiontrack($token->[2]->{'src'});
148: if ($token->[2]->{'version'}) {
149: unless ($hash{'version_'.$turi}) {
150: $hash{'version_'.$turi}=$1;
151: }
152: }
153: my $title=$token->[2]->{'title'};
154: $title=~s/\&colon\;/\:/gs;
155: # my $symb=&Apache::lonnet::encode_symb($uri,
156: # $token->[2]->{'id'},
157: # $turi);
158: # &Apache::lonnet::do_cache_new('title',$symb,$title);
159: unless ($ispage) {
160: $turi=~/\.(\w+)$/;
161: my $embstyle=&Apache::loncommon::fileembstyle($1);
162: if ($token->[2]->{'external'} eq 'true') { # external
163: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
164: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
165: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
166: $turi='/adm/wrapper'.$turi;
167: } elsif ($embstyle eq 'ssi') {
168: #do nothing with these
169: } elsif ($turi!~/\.(sequence|page)$/) {
170: $turi='/adm/coursedocs/showdoc'.$turi;
171: }
172: } elsif ($turi=~/\S/) { # normal non-empty internal resource
173: my $mapdir=$uri;
174: $mapdir=~s/[^\/]+$//;
175: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
176: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
177: $turi='/adm/wrapper'.$turi;
178: }
179: }
180: }
181: # Store reverse lookup, remove query string
182: my $idsuri=$turi;
183: $idsuri=~s/\?.+$//;
184: if (defined($hash{'ids_'.$idsuri})) {
185: $hash{'ids_'.$idsuri}.=','.$rid;
186: } else {
187: $hash{'ids_'.$idsuri}=''.$rid;
188: }
189:
190: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
191: $turi.='?register=1';
192: }
193:
194: $hash{'src_'.$rid}=$turi;
195:
196: if ($token->[2]->{'external'} eq 'true') {
197: $hash{'ext_'.$rid}='true:';
198: } else {
199: $hash{'ext_'.$rid}='false:';
200: }
201: if ($token->[2]->{'type'}) {
202: $hash{'type_'.$rid}=$token->[2]->{'type'};
203: if ($token->[2]->{'type'} eq 'start') {
204: $hash{'map_start_'.$uri}="$rid";
205: }
206: if ($token->[2]->{'type'} eq 'finish') {
207: $hash{'map_finish_'.$uri}="$rid";
208: }
209: } else {
210: $hash{'type_'.$rid}='normal';
211: }
212:
213: if (($turi=~/\.sequence$/) ||
214: ($turi=~/\.page$/)) {
215: $hash{'is_map_'.$rid}=1;
216: &loadmap($turi);
217: }
218:
219: } elsif ($token->[1] eq 'condition') {
220: # ------------------------------------------------------------------- Condition
221:
222: my $rid=$lpc.'.'.$token->[2]->{'id'};
223:
224: $hash{'kind_'.$rid}='cond';
225: $cond[$#cond+1]=$token->[2]->{'value'};
226: $hash{'condid_'.$rid}=$#cond;
227: if ($token->[2]->{'type'}) {
228: $cond[$#cond].=':'.$token->[2]->{'type'};
229: } else {
230: $cond[$#cond].=':normal';
231: }
232:
233: } elsif ($token->[1] eq 'link') {
234: # ----------------------------------------------------------------------- Links
235:
236: $linkpc++;
237: my $linkid=$lpc.'.'.$linkpc;
238:
239: my $goesto=$lpc.'.'.$token->[2]->{'to'};
240: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
241: my $undercond=0;
242:
243: if ($token->[2]->{'condition'}) {
244: $undercond=$lpc.'.'.$token->[2]->{'condition'};
245: }
246:
247: $hash{'goesto_'.$linkid}=$goesto;
248: $hash{'comesfrom_'.$linkid}=$comesfrom;
249: $hash{'undercond_'.$linkid}=$undercond;
250:
251: if (defined($hash{'to_'.$comesfrom})) {
252: $hash{'to_'.$comesfrom}.=','.$linkid;
253: } else {
254: $hash{'to_'.$comesfrom}=''.$linkid;
255: }
256: if (defined($hash{'from_'.$goesto})) {
257: $hash{'from_'.$goesto}.=','.$linkid;
258: } else {
259: $hash{'from_'.$goesto}=''.$linkid;
260: }
261: } elsif ($token->[1] eq 'param') {
262: # ------------------------------------------------------------------- Parameter
263:
264: my $referid=$lpc.'.'.$token->[2]->{'to'};
265: my $name=$token->[2]->{'name'};
266: my $part;
267: if ($name=~/^parameter_(.*)_/) {
268: $part=$1;
269: } else {
270: $part=0;
271: }
272: $name=~s/^.*_([^_]*)$/$1/;
273: my $newparam=
274: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
275: &Apache::lonnet::escape($part.'.'.$name).'='.
276: &Apache::lonnet::escape($token->[2]->{'value'});
277: if (defined($hash{'param_'.$referid})) {
278: $hash{'param_'.$referid}.='&'.$newparam;
279: } else {
280: $hash{'param_'.$referid}=''.$newparam;
281: }
282: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
283: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
284: }
285: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
286: $randompick{$referid}=$token->[2]->{'value'};
287: }
288: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
289: $randompick{$referid}=$token->[2]->{'value'};
290: }
291: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
292: if ($token->[2]->{'value'}=~/^yes$/i) {
293: $encurl{$referid}=1;
294: }
295: }
296: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
297: if ($token->[2]->{'value'}=~/^yes$/i) {
298: $hiddenurl{$referid}=1;
299: }
300: }
301: }
302:
303: }
304: }
305:
306: } else {
307: $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
308: }
309: }
310:
311: # --------------------------------------------------------- Simplify expression
312:
313: sub simplify {
314: my $expression=shift;
315: # (8)=8
316: $expression=~s/\((\d+)\)/$1/g;
317: # 8&8=8
318: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
319: # 8|8=8
320: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
321: # (5&3)&4=5&3&4
322: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
323: # (((5&3)|(4&6)))=((5&3)|(4&6))
324: $expression=~
325: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
326: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
327: $expression=~
328: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
329: return $expression;
330: }
331:
332: # -------------------------------------------------------- Build condition hash
333:
334: sub traceroute {
335: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
336: my $newsofar=$sofar=simplify($sofar);
337: unless ($beenhere=~/\&$rid\&/) {
338: $beenhere.=$rid.'&';
339: my ($mapid,$resid)=split(/\./,$rid);
340: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
341: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
342: if ($hdnflag || lc($hidden) eq 'yes') { $hiddenurl{$rid}=1; }
343: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
344: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
345: if (($retfurl eq '') && ($hash{'src_'.$rid})
346: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
347: $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
348: 'symb='.$symb;
349: }
350: if (defined($hash{'conditions_'.$rid})) {
351: $hash{'conditions_'.$rid}=simplify(
352: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
353: } else {
354: $hash{'conditions_'.$rid}=$sofar;
355: }
356: $newsofar=$hash{'conditions_'.$rid};
357: if (defined($hash{'is_map_'.$rid})) {
358: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
359: $sofar=$newsofar=
360: &traceroute($sofar,
361: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
362: $encflag || $encurl{$rid},
363: $hdnflag || $hiddenurl{$rid});
364: }
365: }
366: if (defined($hash{'to_'.$rid})) {
367: foreach (split(/\,/,$hash{'to_'.$rid})) {
368: my $further=$sofar;
369: if ($hash{'undercond_'.$_}) {
370: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
371: $further=simplify('('.$further.')&('.
372: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
373: } else {
374: $errtext.='Undefined condition ID: '
375: .$hash{'undercond_'.$_}.'. ';
376: }
377: }
378: $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
379: $encflag,$hdnflag);
380: }
381: }
382: }
383: return $newsofar;
384: }
385:
386: # ------------------------------ Cascading conditions, quick access, parameters
387:
388: sub accinit {
389: my ($uri,$short,$fn)=@_;
390: my %acchash=();
391: my %captured=();
392: my $condcounter=0;
393: $acchash{'acc.cond.'.$short.'.0'}=0;
394: foreach (keys %hash) {
395: if ($_=~/^conditions/) {
396: my $expr=$hash{$_};
397: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
398: my $sub=$_;
399: my $orig=$_;
400: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
401: my $factor=$1;
402: $sub=~s/$factor//g;
403: $sub=~s/^\(/\($factor\(/;
404: $sub.=')';
405: $sub=simplify($sub);
406: $orig=~s/(\W)/\\$1/g;
407: $expr=~s/$orig/$sub/;
408: }
409: $hash{$_}=$expr;
410: unless (defined($captured{$expr})) {
411: $condcounter++;
412: $captured{$expr}=$condcounter;
413: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
414: }
415: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
416: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
417: $hash{'src_'.$1.'.'.$2});
418: foreach (split(/\&/,$hash{$_})) {
419: my ($typename,$value)=split(/\=/,$_);
420: my ($type,$name)=split(/\:/,$typename);
421: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
422: &Apache::lonnet::unescape($value);
423: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
424: &Apache::lonnet::unescape($type);
425: }
426: }
427: }
428: foreach (keys %hash) {
429: if ($_=~/^ids/) {
430: foreach (split(/\,/,$hash{$_})) {
431: my $resid=$_;
432: my $uri=$hash{'src_'.$resid};
433: $uri=~s/^\/adm\/wrapper//;
434: $uri=&Apache::lonnet::declutter($uri);
435: my @uriparts=split(/\//,$uri);
436: my $urifile=$uriparts[$#uriparts];
437: $#uriparts--;
438: my $uripath=join('/',@uriparts);
439: if ($uripath) {
440: my $uricond='0';
441: if (defined($hash{'conditions_'.$resid})) {
442: $uricond=$captured{$hash{'conditions_'.$resid}};
443: }
444: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
445: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
446: /(\&\Q$urifile\E\:[^\&]*)/) {
447: my $replace=$1;
448: my $regexp=$replace;
449: #$regexp=~s/\|/\\\|/g;
450: $acchash{'acc.res.'.$short.'.'.$uripath}
451: =~s/\Q$regexp\E/$replace\|$uricond/;
452: } else {
453: $acchash{'acc.res.'.$short.'.'.$uripath}.=
454: $urifile.':'.$uricond.'&';
455: }
456: } else {
457: $acchash{'acc.res.'.$short.'.'.$uripath}=
458: '&'.$urifile.':'.$uricond.'&';
459: }
460: }
461: }
462: }
463: }
464: $acchash{'acc.res.'.$short.'.'}='&:0&';
465: my $courseuri=$uri;
466: $courseuri=~s/^\/res\///;
467: &Apache::lonnet::delenv('(acc\.|httpref\.)');
468: &Apache::lonnet::appenv(%acchash);
469: }
470:
471: # ---------------- Selectively delete from randompick maps and hidden url parms
472:
473: sub hiddenurls {
474: my $randomoutentry='';
475: foreach my $rid (keys %randompick) {
476: my $rndpick=$randompick{$rid};
477: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
478: # ------------------------------------------- put existing resources into array
479: my @currentrids=();
480: foreach (sort(keys(%hash))) {
481: if ($_=~/^src_($mpc\.\d+)/) {
482: if ($hash{'src_'.$1}) { push @currentrids, $1; }
483: }
484: }
485: # rids are number.number and we want to numercially sort on
486: # the second number
487: @currentrids=sort {
488: my (undef,$aid)=split(/\./,$a);
489: my (undef,$bid)=split(/\./,$b);
490: $aid <=> $bid;
491: } @currentrids;
492: next if ($#currentrids<$rndpick);
493: # -------------------------------- randomly eliminate the ones that should stay
494: my (undef,$id)=split(/\./,$rid);
495: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
496: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
497: &Apache::lonnet::setup_random_from_rndseed($rndseed);
498: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
499: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
500: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
501: # -------------------------------------------------------- delete the leftovers
502: for (my $k=0; $k<=$#currentrids; $k++) {
503: if ($currentrids[$k]) {
504: $hash{'randomout_'.$currentrids[$k]}=1;
505: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
506: $randomoutentry.='&'.
507: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
508: $resid,
509: $hash{'src_'.$currentrids[$k]}
510: ).'&';
511: }
512: }
513: }
514: # ------------------------------ take care of explicitly hidden urls or folders
515: foreach my $rid (keys %hiddenurl) {
516: $hash{'randomout_'.$rid}=1;
517: my ($mapid,$resid)=split(/\./,$rid);
518: $randomoutentry.='&'.
519: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
520: $hash{'src_'.$rid}).'&';
521: }
522: # --------------------------------------- append randomout entry to environment
523: if ($randomoutentry) {
524: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
525: }
526: }
527:
528: # ---------------------------------------------------- Read map and all submaps
529:
530: sub readmap {
531: my $short=shift;
532: $short=~s/^\///;
533: my %cenv=&Apache::lonnet::coursedescription($short);
534: my $fn=$cenv{'fn'};
535: my $uri;
536: $short=~s/\//\_/g;
537: unless ($uri=$cenv{'url'}) {
538: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
539: "Could not load course $short.</font>");
540: return 'No course data available.';
541: }
542: @cond=('true:normal');
543: #unlink($fn.'.db');
544: #unlink($fn.'_symb.db');
545: unlink($fn.'.state');
546: unlink($fn.'parms.db');
547: undef %randompick;
548: undef %hiddenurl;
549: undef %encurl;
550: $retfurl='';
551: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
552: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
553: %hash=();
554: %parmhash=();
555: $errtext='';
556: $pc=0;
557: &processversionfile(%cenv);
558: my $furi=&Apache::lonnet::clutter($uri);
559: $hash{'src_0.0'}=&versiontrack($furi);
560: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
561: $hash{'ids_'.$furi}='0.0';
562: $hash{'is_map_0.0'}=1;
563: loadmap($uri);
564: if (defined($hash{'map_start_'.$uri})) {
565: &Apache::lonnet::appenv("request.course.id" => $short,
566: "request.course.fn" => $fn,
567: "request.course.uri" => $uri);
568: &traceroute('0',$hash{'map_start_'.$uri},'&');
569: &accinit($uri,$short,$fn);
570: &hiddenurls();
571: }
572: # ------------------------------------------------------- Put versions into src
573: foreach (keys %hash) {
574: if ($_=~/^src\_/) {
575: $hash{$_}=&putinversion($hash{$_});
576: }
577: }
578: # ---------------------------------------------------------------- Encrypt URLs
579: foreach (keys %encurl) {
580: # $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
581: $hash{'encrypted_'.$_}=1;
582: }
583: # ----------------------------------------------- Close hashes to finally store
584: # --------------------------------- Routine must pass this point, no early outs
585: unless ((untie(%hash)) && (untie(%parmhash))) {
586: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
587: "Could not untie coursemap $fn for $uri.</font>");
588: }
589: # ---------------------------------------------------- Store away initial state
590: {
591: my $cfh;
592: if ($cfh=Apache::File->new(">$fn.state")) {
593: print $cfh join("\n",@cond);
594: } else {
595: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
596: "Could not write statemap $fn for $uri.</font>");
597: }
598: }
599: } else {
600: # if we are here it is likely because we are already trying to
601: # initialize the course in another child, busy wait trying to
602: # tie the hashes for the next 90 seconds, if we succeed forward
603: # them on to navmaps, if we fail, throw up the Could not init
604: # course screen
605: untie(%hash);
606: untie(%parmhash);
607: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
608: "Could not tie coursemap $fn for $uri.</font>");
609: my $i=0;
610: while($i<90) {
611: $i++;
612: sleep(1);
613: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
614: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
615: $retfurl='/adm/navmaps';
616: &Apache::lonnet::appenv("request.course.id" => $short,
617: "request.course.fn" => $fn,
618: "request.course.uri" => $uri);
619: untie(%hash);
620: untie(%parmhash);
621: last;
622: }
623: }
624: untie(%hash);
625: untie(%parmhash);
626: }
627: }
628: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
629: # ------------------------------------------------- Check for critical messages
630:
631: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
632: $ENV{'user.name'});
633: if ($what[0]) {
634: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
635: $retfurl='/adm/email?critical=display';
636: }
637: }
638: return ($retfurl,$errtext);
639: }
640:
641: # ------------------------------------------------------- Evaluate state string
642:
643: sub evalstate {
644: my $fn=$ENV{'request.course.fn'}.'.state';
645: my $state='';
646: if (-e $fn) {
647: my @conditions=();
648: {
649: my $fh=Apache::File->new($fn);
650: @conditions=<$fh>;
651: }
652: my $safeeval = new Safe;
653: my $safehole = new Safe::Hole;
654: $safeeval->permit("entereval");
655: $safeeval->permit(":base_math");
656: $safeeval->deny(":base_io");
657: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
658: foreach my $line (@conditions) {
659: chomp($line);
660: my ($condition,$weight)=split(/\:/,$line);
661: if ($safeeval->reval($condition)) {
662: if ($weight eq 'force') {
663: $state.='3';
664: } else {
665: $state.='2';
666: }
667: } else {
668: if ($weight eq 'stop') {
669: $state.='0';
670: } else {
671: $state.='1';
672: }
673: }
674: }
675: }
676: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
677: return $state;
678: }
679:
680: 1;
681: __END__
682:
683: =head1 NAME
684:
685: Apache::lonuserstate - Construct and maintain state and binary representation
686: of course for user
687:
688: =head1 SYNOPSIS
689:
690: Invoked by lonroles.pm.
691:
692: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
693:
694: =head1 INTRODUCTION
695:
696: This module constructs and maintains state and binary representation
697: of course for user.
698:
699: This is part of the LearningOnline Network with CAPA project
700: described at http://www.lon-capa.org.
701:
702: =head1 HANDLER SUBROUTINE
703:
704: There is no handler subroutine.
705:
706: =head1 OTHER SUBROUTINES
707:
708: =over 4
709:
710: =item *
711:
712: loadmap() : Loads map from disk
713:
714: =item *
715:
716: simplify() : Simplify expression
717:
718: =item *
719:
720: traceroute() : Build condition hash
721:
722: =item *
723:
724: accinit() : Cascading conditions, quick access, parameters
725:
726: =item *
727:
728: readmap() : Read map and all submaps
729:
730: =item *
731:
732: evalstate() : Evaluate state string
733:
734: =back
735:
736: =cut
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