1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.92 2005/06/08 18:49:38 www 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 HTML::TokeParser;
36: use Apache::lonnet;
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:
45: # ---------------------------------------------------- Globals for this package
46:
47: my $pc; # Package counter
48: my %hash; # The big tied hash
49: my %parmhash;# The hash with the parameters
50: my @cond; # Array with all of the conditions
51: my $errtext; # variable with all errors
52: my $retfurl; # variable with the very first URL in the course
53: my %randompick; # randomly picked resources
54: my %randompickseed; # optional seed for randomly picking resources
55: my %encurl; # URLs in this folder are supposed to be encrypted
56: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
57:
58: # ----------------------------------- Remove version from URL and store in hash
59:
60: sub versiontrack {
61: my $uri=shift;
62: if ($uri=~/\.(\d+)\.\w+$/) {
63: my $version=$1;
64: $uri=~s/\.\d+\.(\w+)$/\.$1/;
65: unless ($hash{'version_'.$uri}) {
66: $hash{'version_'.$uri}=$version;
67: }
68: }
69: return $uri;
70: }
71:
72: # -------------------------------------------------------------- Put in version
73:
74: sub putinversion {
75: my $uri=shift;
76: if ($hash{'version_'.$uri}) {
77: my $version=$hash{'version_'.$uri};
78: if ($version eq 'mostrecent') { return $uri; }
79: if ($version eq &Apache::lonnet::getversion(
80: &Apache::lonnet::filelocation('',$uri)))
81: { return $uri; }
82: $uri=~s/\.(\w+)$/\.$version\.$1/;
83: }
84: return $uri;
85: }
86:
87: # ----------------------------------------- Processing versions file for course
88:
89: sub processversionfile {
90: my %cenv=@_;
91: my %versions=&Apache::lonnet::dump('resourceversions',
92: $cenv{'domain'},
93: $cenv{'num'});
94: foreach (keys %versions) {
95: if ($_=~/^error\:/) { return; }
96: $hash{'version_'.$_}=$versions{$_};
97: }
98: }
99:
100: # --------------------------------------------------------- Loads map from disk
101:
102: sub loadmap {
103: my $uri=shift;
104: if ($hash{'map_pc_'.$uri}) { return OK; }
105:
106: $pc++;
107: my $lpc=$pc;
108: $hash{'map_pc_'.$uri}=$lpc;
109: $hash{'map_id_'.$lpc}=$uri;
110:
111: # Determine and check filename
112: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
113:
114: my $ispage=($fn=~/\.page$/);
115:
116: unless (($fn=~/\.sequence$/) ||
117: ($fn=~/\.page$/)) {
118: $errtext.="Invalid map: $fn\n";
119: return OK;
120: }
121:
122: my $instr=&Apache::lonnet::getfile($fn);
123:
124: unless ($instr eq -1) {
125:
126: # Successfully got file, parse it
127:
128: my $parser = HTML::TokeParser->new(\$instr);
129: my $token;
130:
131: my $linkpc=0;
132:
133: $fn=~/\.(\w+)$/;
134:
135: $hash{'map_type_'.$lpc}=$1;
136:
137: while ($token = $parser->get_token) {
138: if ($token->[0] eq 'S') {
139: if ($token->[1] eq 'resource') {
140: # -------------------------------------------------------------------- Resource
141: if ($token->[2]->{'type'} eq 'zombie') { next; }
142: my $rid=$lpc.'.'.$token->[2]->{'id'};
143:
144: $hash{'kind_'.$rid}='res';
145: $hash{'title_'.$rid}=$token->[2]->{'title'};
146: my $turi=&versiontrack($token->[2]->{'src'});
147: if ($token->[2]->{'version'}) {
148: unless ($hash{'version_'.$turi}) {
149: $hash{'version_'.$turi}=$1;
150: }
151: }
152: my $title=$token->[2]->{'title'};
153: $title=~s/\&colon\;/\:/gs;
154: # my $symb=&Apache::lonnet::encode_symb($uri,
155: # $token->[2]->{'id'},
156: # $turi);
157: # &Apache::lonnet::do_cache_new('title',$symb,$title);
158: unless ($ispage) {
159: $turi=~/\.(\w+)$/;
160: my $embstyle=&Apache::loncommon::fileembstyle($1);
161: if ($token->[2]->{'external'} eq 'true') { # external
162: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
163: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
164: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
165: $turi='/adm/wrapper'.$turi;
166: } elsif ($embstyle eq 'ssi') {
167: #do nothing with these
168: } elsif ($turi!~/\.(sequence|page)$/) {
169: $turi='/adm/coursedocs/showdoc'.$turi;
170: }
171: } elsif ($turi=~/\S/) { # normal non-empty internal resource
172: my $mapdir=$uri;
173: $mapdir=~s/[^\/]+$//;
174: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
175: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
176: $turi='/adm/wrapper'.$turi;
177: }
178: }
179: }
180: # Store reverse lookup, remove query string
181: my $idsuri=$turi;
182: $idsuri=~s/\?.+$//;
183: if (defined($hash{'ids_'.$idsuri})) {
184: $hash{'ids_'.$idsuri}.=','.$rid;
185: } else {
186: $hash{'ids_'.$idsuri}=''.$rid;
187: }
188:
189: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
190: $turi.='?register=1';
191: }
192:
193: $hash{'src_'.$rid}=$turi;
194:
195: if ($token->[2]->{'external'} eq 'true') {
196: $hash{'ext_'.$rid}='true:';
197: } else {
198: $hash{'ext_'.$rid}='false:';
199: }
200: if ($token->[2]->{'type'}) {
201: $hash{'type_'.$rid}=$token->[2]->{'type'};
202: if ($token->[2]->{'type'} eq 'start') {
203: $hash{'map_start_'.$uri}="$rid";
204: }
205: if ($token->[2]->{'type'} eq 'finish') {
206: $hash{'map_finish_'.$uri}="$rid";
207: }
208: } else {
209: $hash{'type_'.$rid}='normal';
210: }
211:
212: if (($turi=~/\.sequence$/) ||
213: ($turi=~/\.page$/)) {
214: $hash{'is_map_'.$rid}=1;
215: &loadmap($turi);
216: }
217:
218: } elsif ($token->[1] eq 'condition') {
219: # ------------------------------------------------------------------- Condition
220:
221: my $rid=$lpc.'.'.$token->[2]->{'id'};
222:
223: $hash{'kind_'.$rid}='cond';
224: $cond[$#cond+1]=$token->[2]->{'value'};
225: $hash{'condid_'.$rid}=$#cond;
226: if ($token->[2]->{'type'}) {
227: $cond[$#cond].=':'.$token->[2]->{'type'};
228: } else {
229: $cond[$#cond].=':normal';
230: }
231:
232: } elsif ($token->[1] eq 'link') {
233: # ----------------------------------------------------------------------- Links
234:
235: $linkpc++;
236: my $linkid=$lpc.'.'.$linkpc;
237:
238: my $goesto=$lpc.'.'.$token->[2]->{'to'};
239: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
240: my $undercond=0;
241:
242: if ($token->[2]->{'condition'}) {
243: $undercond=$lpc.'.'.$token->[2]->{'condition'};
244: }
245:
246: $hash{'goesto_'.$linkid}=$goesto;
247: $hash{'comesfrom_'.$linkid}=$comesfrom;
248: $hash{'undercond_'.$linkid}=$undercond;
249:
250: if (defined($hash{'to_'.$comesfrom})) {
251: $hash{'to_'.$comesfrom}.=','.$linkid;
252: } else {
253: $hash{'to_'.$comesfrom}=''.$linkid;
254: }
255: if (defined($hash{'from_'.$goesto})) {
256: $hash{'from_'.$goesto}.=','.$linkid;
257: } else {
258: $hash{'from_'.$goesto}=''.$linkid;
259: }
260: } elsif ($token->[1] eq 'param') {
261: # ------------------------------------------------------------------- Parameter
262:
263: my $referid=$lpc.'.'.$token->[2]->{'to'};
264: my $name=$token->[2]->{'name'};
265: my $part;
266: if ($name=~/^parameter_(.*)_/) {
267: $part=$1;
268: } else {
269: $part=0;
270: }
271: $name=~s/^.*_([^_]*)$/$1/;
272: my $newparam=
273: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
274: &Apache::lonnet::escape($part.'.'.$name).'='.
275: &Apache::lonnet::escape($token->[2]->{'value'});
276: if (defined($hash{'param_'.$referid})) {
277: $hash{'param_'.$referid}.='&'.$newparam;
278: } else {
279: $hash{'param_'.$referid}=''.$newparam;
280: }
281: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
282: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
283: }
284: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
285: $randompick{$referid}=$token->[2]->{'value'};
286: }
287: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
288: $randompick{$referid}=$token->[2]->{'value'};
289: }
290: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
291: if ($token->[2]->{'value'}=~/^yes$/i) {
292: $encurl{$referid}=1;
293: }
294: }
295: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
296: if ($token->[2]->{'value'}=~/^yes$/i) {
297: $hiddenurl{$referid}=1;
298: }
299: }
300: }
301:
302: }
303: }
304:
305: } else {
306: $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
307: }
308: }
309:
310: # --------------------------------------------------------- Simplify expression
311:
312: sub simplify {
313: my $expression=shift;
314: # (8)=8
315: $expression=~s/\((\d+)\)/$1/g;
316: # 8&8=8
317: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
318: # 8|8=8
319: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
320: # (5&3)&4=5&3&4
321: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
322: # (((5&3)|(4&6)))=((5&3)|(4&6))
323: $expression=~
324: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
325: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
326: $expression=~
327: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
328: return $expression;
329: }
330:
331: # -------------------------------------------------------- Build condition hash
332:
333: sub traceroute {
334: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
335: my $newsofar=$sofar=simplify($sofar);
336: unless ($beenhere=~/\&$rid\&/) {
337: $beenhere.=$rid.'&';
338: my ($mapid,$resid)=split(/\./,$rid);
339: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
340: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
341:
342: if ($hdnflag || lc($hidden) eq 'yes') {
343: $hiddenurl{$rid}=1;
344: }
345: if (!$hdnflag && lc($hidden) eq 'no') {
346: delete($hiddenurl{$rid});
347: }
348:
349: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
350: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
351: if (($retfurl eq '') && ($hash{'src_'.$rid})
352: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
353: $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
354: 'symb='.$symb;
355: }
356: if (defined($hash{'conditions_'.$rid})) {
357: $hash{'conditions_'.$rid}=simplify(
358: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
359: } else {
360: $hash{'conditions_'.$rid}=$sofar;
361: }
362: $newsofar=$hash{'conditions_'.$rid};
363: if (defined($hash{'is_map_'.$rid})) {
364: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
365: $sofar=$newsofar=
366: &traceroute($sofar,
367: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
368: $encflag || $encurl{$rid},
369: $hdnflag || $hiddenurl{$rid});
370: }
371: }
372: if (defined($hash{'to_'.$rid})) {
373: foreach (split(/\,/,$hash{'to_'.$rid})) {
374: my $further=$sofar;
375: if ($hash{'undercond_'.$_}) {
376: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
377: $further=simplify('('.$further.')&('.
378: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
379: } else {
380: $errtext.='Undefined condition ID: '
381: .$hash{'undercond_'.$_}.'. ';
382: }
383: }
384: $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
385: $encflag,$hdnflag);
386: }
387: }
388: }
389: return $newsofar;
390: }
391:
392: # ------------------------------ Cascading conditions, quick access, parameters
393:
394: sub accinit {
395: my ($uri,$short,$fn)=@_;
396: my %acchash=();
397: my %captured=();
398: my $condcounter=0;
399: $acchash{'acc.cond.'.$short.'.0'}=0;
400: foreach (keys %hash) {
401: if ($_=~/^conditions/) {
402: my $expr=$hash{$_};
403: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
404: my $sub=$_;
405: my $orig=$_;
406: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
407: my $factor=$1;
408: $sub=~s/$factor//g;
409: $sub=~s/^\(/\($factor\(/;
410: $sub.=')';
411: $sub=simplify($sub);
412: $orig=~s/(\W)/\\$1/g;
413: $expr=~s/$orig/$sub/;
414: }
415: $hash{$_}=$expr;
416: unless (defined($captured{$expr})) {
417: $condcounter++;
418: $captured{$expr}=$condcounter;
419: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
420: }
421: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
422: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
423: $hash{'src_'.$1.'.'.$2});
424: foreach (split(/\&/,$hash{$_})) {
425: my ($typename,$value)=split(/\=/,$_);
426: my ($type,$name)=split(/\:/,$typename);
427: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
428: &Apache::lonnet::unescape($value);
429: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
430: &Apache::lonnet::unescape($type);
431: }
432: }
433: }
434: foreach (keys %hash) {
435: if ($_=~/^ids/) {
436: foreach (split(/\,/,$hash{$_})) {
437: my $resid=$_;
438: my $uri=$hash{'src_'.$resid};
439: $uri=~s/^\/adm\/wrapper//;
440: $uri=&Apache::lonnet::declutter($uri);
441: my @uriparts=split(/\//,$uri);
442: my $urifile=$uriparts[$#uriparts];
443: $#uriparts--;
444: my $uripath=join('/',@uriparts);
445: if ($uripath) {
446: my $uricond='0';
447: if (defined($hash{'conditions_'.$resid})) {
448: $uricond=$captured{$hash{'conditions_'.$resid}};
449: }
450: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
451: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
452: /(\&\Q$urifile\E\:[^\&]*)/) {
453: my $replace=$1;
454: my $regexp=$replace;
455: #$regexp=~s/\|/\\\|/g;
456: $acchash{'acc.res.'.$short.'.'.$uripath}
457: =~s/\Q$regexp\E/$replace\|$uricond/;
458: } else {
459: $acchash{'acc.res.'.$short.'.'.$uripath}.=
460: $urifile.':'.$uricond.'&';
461: }
462: } else {
463: $acchash{'acc.res.'.$short.'.'.$uripath}=
464: '&'.$urifile.':'.$uricond.'&';
465: }
466: }
467: }
468: }
469: }
470: $acchash{'acc.res.'.$short.'.'}='&:0&';
471: my $courseuri=$uri;
472: $courseuri=~s/^\/res\///;
473: &Apache::lonnet::delenv('(acc\.|httpref\.)');
474: &Apache::lonnet::appenv(%acchash);
475: }
476:
477: # ---------------- Selectively delete from randompick maps and hidden url parms
478:
479: sub hiddenurls {
480: my $randomoutentry='';
481: foreach my $rid (keys %randompick) {
482: my $rndpick=$randompick{$rid};
483: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
484: # ------------------------------------------- put existing resources into array
485: my @currentrids=();
486: foreach (sort(keys(%hash))) {
487: if ($_=~/^src_($mpc\.\d+)/) {
488: if ($hash{'src_'.$1}) { push @currentrids, $1; }
489: }
490: }
491: # rids are number.number and we want to numercially sort on
492: # the second number
493: @currentrids=sort {
494: my (undef,$aid)=split(/\./,$a);
495: my (undef,$bid)=split(/\./,$b);
496: $aid <=> $bid;
497: } @currentrids;
498: next if ($#currentrids<$rndpick);
499: # -------------------------------- randomly eliminate the ones that should stay
500: my (undef,$id)=split(/\./,$rid);
501: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
502: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
503: &Apache::lonnet::setup_random_from_rndseed($rndseed);
504: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
505: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
506: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
507: # -------------------------------------------------------- delete the leftovers
508: for (my $k=0; $k<=$#currentrids; $k++) {
509: if ($currentrids[$k]) {
510: $hash{'randomout_'.$currentrids[$k]}=1;
511: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
512: $randomoutentry.='&'.
513: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
514: $resid,
515: $hash{'src_'.$currentrids[$k]}
516: ).'&';
517: }
518: }
519: }
520: # ------------------------------ take care of explicitly hidden urls or folders
521: foreach my $rid (keys %hiddenurl) {
522: $hash{'randomout_'.$rid}=1;
523: my ($mapid,$resid)=split(/\./,$rid);
524: $randomoutentry.='&'.
525: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
526: $hash{'src_'.$rid}).'&';
527: }
528: # --------------------------------------- append randomout entry to environment
529: if ($randomoutentry) {
530: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
531: }
532: }
533:
534: # ---------------------------------------------------- Read map and all submaps
535:
536: sub readmap {
537: my $short=shift;
538: $short=~s/^\///;
539: my %cenv=&Apache::lonnet::coursedescription($short);
540: my $fn=$cenv{'fn'};
541: my $uri;
542: $short=~s/\//\_/g;
543: unless ($uri=$cenv{'url'}) {
544: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
545: "Could not load course $short.</font>");
546: return 'No course data available.';
547: }
548: @cond=('true:normal');
549: #unlink($fn.'.db');
550: #unlink($fn.'_symb.db');
551: unlink($fn.'.state');
552: unlink($fn.'parms.db');
553: undef %randompick;
554: undef %hiddenurl;
555: undef %encurl;
556: $retfurl='';
557: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
558: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
559: %hash=();
560: %parmhash=();
561: $errtext='';
562: $pc=0;
563: &processversionfile(%cenv);
564: my $furi=&Apache::lonnet::clutter($uri);
565: $hash{'src_0.0'}=&versiontrack($furi);
566: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
567: $hash{'ids_'.$furi}='0.0';
568: $hash{'is_map_0.0'}=1;
569: loadmap($uri);
570: if (defined($hash{'map_start_'.$uri})) {
571: &Apache::lonnet::appenv("request.course.id" => $short,
572: "request.course.fn" => $fn,
573: "request.course.uri" => $uri);
574: &traceroute('0',$hash{'map_start_'.$uri},'&');
575: &accinit($uri,$short,$fn);
576: &hiddenurls();
577: }
578: # ------------------------------------------------------- Put versions into src
579: foreach (keys %hash) {
580: if ($_=~/^src\_/) {
581: $hash{$_}=&putinversion($hash{$_});
582: }
583: }
584: # ---------------------------------------------------------------- Encrypt URLs
585: foreach (keys %encurl) {
586: # $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
587: $hash{'encrypted_'.$_}=1;
588: }
589: # ----------------------------------------------- Close hashes to finally store
590: # --------------------------------- Routine must pass this point, no early outs
591: unless ((untie(%hash)) && (untie(%parmhash))) {
592: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
593: "Could not untie coursemap $fn for $uri.</font>");
594: }
595: # ---------------------------------------------------- Store away initial state
596: {
597: my $cfh;
598: if (open($cfh,">$fn.state")) {
599: print $cfh join("\n",@cond);
600: } else {
601: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
602: "Could not write statemap $fn for $uri.</font>");
603: }
604: }
605: } else {
606: # if we are here it is likely because we are already trying to
607: # initialize the course in another child, busy wait trying to
608: # tie the hashes for the next 90 seconds, if we succeed forward
609: # them on to navmaps, if we fail, throw up the Could not init
610: # course screen
611: untie(%hash);
612: untie(%parmhash);
613: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
614: "Could not tie coursemap $fn for $uri.</font>");
615: my $i=0;
616: while($i<90) {
617: $i++;
618: sleep(1);
619: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
620: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
621: $retfurl='/adm/navmaps';
622: &Apache::lonnet::appenv("request.course.id" => $short,
623: "request.course.fn" => $fn,
624: "request.course.uri" => $uri);
625: untie(%hash);
626: untie(%parmhash);
627: last;
628: }
629: }
630: untie(%hash);
631: untie(%parmhash);
632: }
633: }
634: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
635: # ------------------------------------------------- Check for critical messages
636:
637: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
638: $env{'user.name'});
639: if ($what[0]) {
640: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
641: $retfurl='/adm/email?critical=display';
642: }
643: }
644: return ($retfurl,$errtext);
645: }
646:
647: # ------------------------------------------------------- Evaluate state string
648:
649: sub evalstate {
650: my $fn=$env{'request.course.fn'}.'.state';
651: my $state='';
652: if (-e $fn) {
653: my @conditions=();
654: {
655: my $fh=Apache::File->new($fn);
656: @conditions=<$fh>;
657: }
658: my $safeeval = new Safe;
659: my $safehole = new Safe::Hole;
660: $safeeval->permit("entereval");
661: $safeeval->permit(":base_math");
662: $safeeval->deny(":base_io");
663: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
664: foreach my $line (@conditions) {
665: chomp($line);
666: my ($condition,$weight)=split(/\:/,$line);
667: if ($safeeval->reval($condition)) {
668: if ($weight eq 'force') {
669: $state.='3';
670: } else {
671: $state.='2';
672: }
673: } else {
674: if ($weight eq 'stop') {
675: $state.='0';
676: } else {
677: $state.='1';
678: }
679: }
680: }
681: }
682: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
683: return $state;
684: }
685:
686: 1;
687: __END__
688:
689: =head1 NAME
690:
691: Apache::lonuserstate - Construct and maintain state and binary representation
692: of course for user
693:
694: =head1 SYNOPSIS
695:
696: Invoked by lonroles.pm.
697:
698: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
699:
700: =head1 INTRODUCTION
701:
702: This module constructs and maintains state and binary representation
703: of course for user.
704:
705: This is part of the LearningOnline Network with CAPA project
706: described at http://www.lon-capa.org.
707:
708: =head1 HANDLER SUBROUTINE
709:
710: There is no handler subroutine.
711:
712: =head1 OTHER SUBROUTINES
713:
714: =over 4
715:
716: =item *
717:
718: loadmap() : Loads map from disk
719:
720: =item *
721:
722: simplify() : Simplify expression
723:
724: =item *
725:
726: traceroute() : Build condition hash
727:
728: =item *
729:
730: accinit() : Cascading conditions, quick access, parameters
731:
732: =item *
733:
734: readmap() : Read map and all submaps
735:
736: =item *
737:
738: evalstate() : Evaluate state string
739:
740: =back
741:
742: =cut
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