1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.94 2005/07/14 21:30:24 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 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: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
77: if ($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\.$1/;
84: }
85: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
86: return $uri;
87: }
88:
89: # ----------------------------------------- Processing versions file for course
90:
91: sub processversionfile {
92: my %cenv=@_;
93: my %versions=&Apache::lonnet::dump('resourceversions',
94: $cenv{'domain'},
95: $cenv{'num'});
96: foreach (keys %versions) {
97: if ($_=~/^error\:/) { return; }
98: $hash{'version_'.$_}=$versions{$_};
99: }
100: }
101:
102: # --------------------------------------------------------- Loads map from disk
103:
104: sub loadmap {
105: my $uri=shift;
106: if ($hash{'map_pc_'.$uri}) { return OK; }
107:
108: $pc++;
109: my $lpc=$pc;
110: $hash{'map_pc_'.$uri}=$lpc;
111: $hash{'map_id_'.$lpc}=$uri;
112:
113: # Determine and check filename
114: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
115:
116: my $ispage=($fn=~/\.page$/);
117:
118: unless (($fn=~/\.sequence$/) ||
119: ($fn=~/\.page$/)) {
120: $errtext.="Invalid map: $fn\n";
121: return OK;
122: }
123:
124: my $instr=&Apache::lonnet::getfile($fn);
125:
126: unless ($instr eq -1) {
127:
128: # Successfully got file, parse it
129:
130: my $parser = HTML::TokeParser->new(\$instr);
131: #$parser->attr_encoded(1);
132: my $token;
133:
134: my $linkpc=0;
135:
136: $fn=~/\.(\w+)$/;
137:
138: $hash{'map_type_'.$lpc}=$1;
139:
140: while ($token = $parser->get_token) {
141: if ($token->[0] eq 'S') {
142: if ($token->[1] eq 'resource') {
143: # -------------------------------------------------------------------- Resource
144: if ($token->[2]->{'type'} eq 'zombie') { next; }
145: my $rid=$lpc.'.'.$token->[2]->{'id'};
146:
147: $hash{'kind_'.$rid}='res';
148: $hash{'title_'.$rid}=$token->[2]->{'title'};
149: my $turi=&versiontrack($token->[2]->{'src'});
150: if ($token->[2]->{'version'}) {
151: unless ($hash{'version_'.$turi}) {
152: $hash{'version_'.$turi}=$1;
153: }
154: }
155: my $title=$token->[2]->{'title'};
156: $title=~s/\&colon\;/\:/gs;
157: # my $symb=&Apache::lonnet::encode_symb($uri,
158: # $token->[2]->{'id'},
159: # $turi);
160: # &Apache::lonnet::do_cache_new('title',$symb,$title);
161: unless ($ispage) {
162: $turi=~/\.(\w+)$/;
163: my $embstyle=&Apache::loncommon::fileembstyle($1);
164: if ($token->[2]->{'external'} eq 'true') { # external
165: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
166: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
167: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
168: $turi='/adm/wrapper'.$turi;
169: } elsif ($embstyle eq 'ssi') {
170: #do nothing with these
171: } elsif ($turi!~/\.(sequence|page)$/) {
172: $turi='/adm/coursedocs/showdoc'.$turi;
173: }
174: } elsif ($turi=~/\S/) { # normal non-empty internal resource
175: my $mapdir=$uri;
176: $mapdir=~s/[^\/]+$//;
177: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
178: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
179: $turi='/adm/wrapper'.$turi;
180: }
181: }
182: }
183: # Store reverse lookup, remove query string
184: my $idsuri=$turi;
185: $idsuri=~s/\?.+$//;
186: if (defined($hash{'ids_'.$idsuri})) {
187: $hash{'ids_'.$idsuri}.=','.$rid;
188: } else {
189: $hash{'ids_'.$idsuri}=''.$rid;
190: }
191:
192: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
193: $turi.='?register=1';
194: }
195:
196: $hash{'src_'.$rid}=$turi;
197:
198: if ($token->[2]->{'external'} eq 'true') {
199: $hash{'ext_'.$rid}='true:';
200: } else {
201: $hash{'ext_'.$rid}='false:';
202: }
203: if ($token->[2]->{'type'}) {
204: $hash{'type_'.$rid}=$token->[2]->{'type'};
205: if ($token->[2]->{'type'} eq 'start') {
206: $hash{'map_start_'.$uri}="$rid";
207: }
208: if ($token->[2]->{'type'} eq 'finish') {
209: $hash{'map_finish_'.$uri}="$rid";
210: }
211: } else {
212: $hash{'type_'.$rid}='normal';
213: }
214:
215: if (($turi=~/\.sequence$/) ||
216: ($turi=~/\.page$/)) {
217: $hash{'is_map_'.$rid}=1;
218: &loadmap($turi);
219: }
220:
221: } elsif ($token->[1] eq 'condition') {
222: # ------------------------------------------------------------------- Condition
223:
224: my $rid=$lpc.'.'.$token->[2]->{'id'};
225:
226: $hash{'kind_'.$rid}='cond';
227: $cond[$#cond+1]=$token->[2]->{'value'};
228: $hash{'condid_'.$rid}=$#cond;
229: if ($token->[2]->{'type'}) {
230: $cond[$#cond].=':'.$token->[2]->{'type'};
231: } else {
232: $cond[$#cond].=':normal';
233: }
234:
235: } elsif ($token->[1] eq 'link') {
236: # ----------------------------------------------------------------------- Links
237:
238: $linkpc++;
239: my $linkid=$lpc.'.'.$linkpc;
240:
241: my $goesto=$lpc.'.'.$token->[2]->{'to'};
242: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
243: my $undercond=0;
244:
245: if ($token->[2]->{'condition'}) {
246: $undercond=$lpc.'.'.$token->[2]->{'condition'};
247: }
248:
249: $hash{'goesto_'.$linkid}=$goesto;
250: $hash{'comesfrom_'.$linkid}=$comesfrom;
251: $hash{'undercond_'.$linkid}=$undercond;
252:
253: if (defined($hash{'to_'.$comesfrom})) {
254: $hash{'to_'.$comesfrom}.=','.$linkid;
255: } else {
256: $hash{'to_'.$comesfrom}=''.$linkid;
257: }
258: if (defined($hash{'from_'.$goesto})) {
259: $hash{'from_'.$goesto}.=','.$linkid;
260: } else {
261: $hash{'from_'.$goesto}=''.$linkid;
262: }
263: } elsif ($token->[1] eq 'param') {
264: # ------------------------------------------------------------------- Parameter
265:
266: my $referid=$lpc.'.'.$token->[2]->{'to'};
267: my $name=$token->[2]->{'name'};
268: my $part;
269: if ($name=~/^parameter_(.*)_/) {
270: $part=$1;
271: } else {
272: $part=0;
273: }
274: $name=~s/^.*_([^_]*)$/$1/;
275: my $newparam=
276: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
277: &Apache::lonnet::escape($part.'.'.$name).'='.
278: &Apache::lonnet::escape($token->[2]->{'value'});
279: if (defined($hash{'param_'.$referid})) {
280: $hash{'param_'.$referid}.='&'.$newparam;
281: } else {
282: $hash{'param_'.$referid}=''.$newparam;
283: }
284: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
285: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
286: }
287: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
288: $randompick{$referid}=$token->[2]->{'value'};
289: }
290: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
291: $randompick{$referid}=$token->[2]->{'value'};
292: }
293: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
294: if ($token->[2]->{'value'}=~/^yes$/i) {
295: $encurl{$referid}=1;
296: }
297: }
298: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
299: if ($token->[2]->{'value'}=~/^yes$/i) {
300: $hiddenurl{$referid}=1;
301: }
302: }
303: }
304:
305: }
306: }
307:
308: } else {
309: $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
310: }
311: }
312:
313: # --------------------------------------------------------- Simplify expression
314:
315: sub simplify {
316: my $expression=shift;
317: # (8)=8
318: $expression=~s/\((\d+)\)/$1/g;
319: # 8&8=8
320: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
321: # 8|8=8
322: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
323: # (5&3)&4=5&3&4
324: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
325: # (((5&3)|(4&6)))=((5&3)|(4&6))
326: $expression=~
327: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
328: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
329: $expression=~
330: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
331: return $expression;
332: }
333:
334: # -------------------------------------------------------- Build condition hash
335:
336: sub traceroute {
337: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
338: my $newsofar=$sofar=simplify($sofar);
339: unless ($beenhere=~/\&$rid\&/) {
340: $beenhere.=$rid.'&';
341: my ($mapid,$resid)=split(/\./,$rid);
342: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
343: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
344:
345: if ($hdnflag || lc($hidden) eq 'yes') {
346: $hiddenurl{$rid}=1;
347: }
348: if (!$hdnflag && lc($hidden) eq 'no') {
349: delete($hiddenurl{$rid});
350: }
351:
352: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
353: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
354: if (($retfurl eq '') && ($hash{'src_'.$rid})
355: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
356: $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
357: 'symb='.$symb;
358: }
359: if (defined($hash{'conditions_'.$rid})) {
360: $hash{'conditions_'.$rid}=simplify(
361: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
362: } else {
363: $hash{'conditions_'.$rid}=$sofar;
364: }
365: $newsofar=$hash{'conditions_'.$rid};
366: if (defined($hash{'is_map_'.$rid})) {
367: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
368: $sofar=$newsofar=
369: &traceroute($sofar,
370: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
371: $encflag || $encurl{$rid},
372: $hdnflag || $hiddenurl{$rid});
373: }
374: }
375: if (defined($hash{'to_'.$rid})) {
376: foreach (split(/\,/,$hash{'to_'.$rid})) {
377: my $further=$sofar;
378: if ($hash{'undercond_'.$_}) {
379: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
380: $further=simplify('('.$further.')&('.
381: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
382: } else {
383: $errtext.='Undefined condition ID: '
384: .$hash{'undercond_'.$_}.'. ';
385: }
386: }
387: $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
388: $encflag,$hdnflag);
389: }
390: }
391: }
392: return $newsofar;
393: }
394:
395: # ------------------------------ Cascading conditions, quick access, parameters
396:
397: sub accinit {
398: my ($uri,$short,$fn)=@_;
399: my %acchash=();
400: my %captured=();
401: my $condcounter=0;
402: $acchash{'acc.cond.'.$short.'.0'}=0;
403: foreach (keys %hash) {
404: if ($_=~/^conditions/) {
405: my $expr=$hash{$_};
406: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
407: my $sub=$_;
408: my $orig=$_;
409: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
410: my $factor=$1;
411: $sub=~s/$factor//g;
412: $sub=~s/^\(/\($factor\(/;
413: $sub.=')';
414: $sub=simplify($sub);
415: $orig=~s/(\W)/\\$1/g;
416: $expr=~s/$orig/$sub/;
417: }
418: $hash{$_}=$expr;
419: unless (defined($captured{$expr})) {
420: $condcounter++;
421: $captured{$expr}=$condcounter;
422: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
423: }
424: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
425: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
426: $hash{'src_'.$1.'.'.$2});
427: foreach (split(/\&/,$hash{$_})) {
428: my ($typename,$value)=split(/\=/,$_);
429: my ($type,$name)=split(/\:/,$typename);
430: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
431: &Apache::lonnet::unescape($value);
432: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
433: &Apache::lonnet::unescape($type);
434: }
435: }
436: }
437: foreach (keys %hash) {
438: if ($_=~/^ids/) {
439: foreach (split(/\,/,$hash{$_})) {
440: my $resid=$_;
441: my $uri=$hash{'src_'.$resid};
442: $uri=~s/^\/adm\/wrapper//;
443: $uri=&Apache::lonnet::declutter($uri);
444: my @uriparts=split(/\//,$uri);
445: my $urifile=$uriparts[$#uriparts];
446: $#uriparts--;
447: my $uripath=join('/',@uriparts);
448: if ($uripath) {
449: my $uricond='0';
450: if (defined($hash{'conditions_'.$resid})) {
451: $uricond=$captured{$hash{'conditions_'.$resid}};
452: }
453: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
454: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
455: /(\&\Q$urifile\E\:[^\&]*)/) {
456: my $replace=$1;
457: my $regexp=$replace;
458: #$regexp=~s/\|/\\\|/g;
459: $acchash{'acc.res.'.$short.'.'.$uripath}
460: =~s/\Q$regexp\E/$replace\|$uricond/;
461: } else {
462: $acchash{'acc.res.'.$short.'.'.$uripath}.=
463: $urifile.':'.$uricond.'&';
464: }
465: } else {
466: $acchash{'acc.res.'.$short.'.'.$uripath}=
467: '&'.$urifile.':'.$uricond.'&';
468: }
469: }
470: }
471: }
472: }
473: $acchash{'acc.res.'.$short.'.'}='&:0&';
474: my $courseuri=$uri;
475: $courseuri=~s/^\/res\///;
476: &Apache::lonnet::delenv('(acc\.|httpref\.)');
477: &Apache::lonnet::appenv(%acchash);
478: }
479:
480: # ---------------- Selectively delete from randompick maps and hidden url parms
481:
482: sub hiddenurls {
483: my $randomoutentry='';
484: foreach my $rid (keys %randompick) {
485: my $rndpick=$randompick{$rid};
486: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
487: # ------------------------------------------- put existing resources into array
488: my @currentrids=();
489: foreach (sort(keys(%hash))) {
490: if ($_=~/^src_($mpc\.\d+)/) {
491: if ($hash{'src_'.$1}) { push @currentrids, $1; }
492: }
493: }
494: # rids are number.number and we want to numercially sort on
495: # the second number
496: @currentrids=sort {
497: my (undef,$aid)=split(/\./,$a);
498: my (undef,$bid)=split(/\./,$b);
499: $aid <=> $bid;
500: } @currentrids;
501: next if ($#currentrids<$rndpick);
502: # -------------------------------- randomly eliminate the ones that should stay
503: my (undef,$id)=split(/\./,$rid);
504: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
505: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
506: &Apache::lonnet::setup_random_from_rndseed($rndseed);
507: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
508: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
509: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
510: # -------------------------------------------------------- delete the leftovers
511: for (my $k=0; $k<=$#currentrids; $k++) {
512: if ($currentrids[$k]) {
513: $hash{'randomout_'.$currentrids[$k]}=1;
514: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
515: $randomoutentry.='&'.
516: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
517: $resid,
518: $hash{'src_'.$currentrids[$k]}
519: ).'&';
520: }
521: }
522: }
523: # ------------------------------ take care of explicitly hidden urls or folders
524: foreach my $rid (keys %hiddenurl) {
525: $hash{'randomout_'.$rid}=1;
526: my ($mapid,$resid)=split(/\./,$rid);
527: $randomoutentry.='&'.
528: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
529: $hash{'src_'.$rid}).'&';
530: }
531: # --------------------------------------- append randomout entry to environment
532: if ($randomoutentry) {
533: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
534: }
535: }
536:
537: # ---------------------------------------------------- Read map and all submaps
538:
539: sub readmap {
540: my $short=shift;
541: $short=~s/^\///;
542: my %cenv=&Apache::lonnet::coursedescription($short);
543: my $fn=$cenv{'fn'};
544: my $uri;
545: $short=~s/\//\_/g;
546: unless ($uri=$cenv{'url'}) {
547: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
548: "Could not load course $short.</font>");
549: return 'No course data available.';
550: }
551: @cond=('true:normal');
552: #unlink($fn.'.db');
553: #unlink($fn.'_symb.db');
554: unlink($fn.'.state');
555: unlink($fn.'parms.db');
556: undef %randompick;
557: undef %hiddenurl;
558: undef %encurl;
559: $retfurl='';
560: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
561: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
562: %hash=();
563: %parmhash=();
564: $errtext='';
565: $pc=0;
566: &processversionfile(%cenv);
567: my $furi=&Apache::lonnet::clutter($uri);
568: $hash{'src_0.0'}=&versiontrack($furi);
569: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
570: $hash{'ids_'.$furi}='0.0';
571: $hash{'is_map_0.0'}=1;
572: loadmap($uri);
573: if (defined($hash{'map_start_'.$uri})) {
574: &Apache::lonnet::appenv("request.course.id" => $short,
575: "request.course.fn" => $fn,
576: "request.course.uri" => $uri);
577: &traceroute('0',$hash{'map_start_'.$uri},'&');
578: &accinit($uri,$short,$fn);
579: &hiddenurls();
580: }
581: # ------------------------------------------------------- Put versions into src
582: foreach (keys %hash) {
583: if ($_=~/^src\_/) {
584: $hash{$_}=&putinversion($hash{$_});
585: }
586: }
587: # ---------------------------------------------------------------- Encrypt URLs
588: foreach (keys %encurl) {
589: # $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
590: $hash{'encrypted_'.$_}=1;
591: }
592: # ----------------------------------------------- Close hashes to finally store
593: # --------------------------------- Routine must pass this point, no early outs
594: $hash{'first_url'}=$retfurl;
595: unless ((untie(%hash)) && (untie(%parmhash))) {
596: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
597: "Could not untie coursemap $fn for $uri.</font>");
598: }
599: # ---------------------------------------------------- Store away initial state
600: {
601: my $cfh;
602: if (open($cfh,">$fn.state")) {
603: print $cfh join("\n",@cond);
604: } else {
605: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
606: "Could not write statemap $fn for $uri.</font>");
607: }
608: }
609: } else {
610: # if we are here it is likely because we are already trying to
611: # initialize the course in another child, busy wait trying to
612: # tie the hashes for the next 90 seconds, if we succeed forward
613: # them on to navmaps, if we fail, throw up the Could not init
614: # course screen
615: untie(%hash);
616: untie(%parmhash);
617: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
618: "Could not tie coursemap $fn for $uri.</font>");
619: my $i=0;
620: while($i<90) {
621: $i++;
622: sleep(1);
623: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
624: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
625: $retfurl='/adm/navmaps';
626: &Apache::lonnet::appenv("request.course.id" => $short,
627: "request.course.fn" => $fn,
628: "request.course.uri" => $uri);
629: untie(%hash);
630: untie(%parmhash);
631: last;
632: }
633: }
634: untie(%hash);
635: untie(%parmhash);
636: }
637: }
638: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
639: # ------------------------------------------------- Check for critical messages
640:
641: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
642: $env{'user.name'});
643: if ($what[0]) {
644: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
645: $retfurl='/adm/email?critical=display';
646: }
647: }
648: return ($retfurl,$errtext);
649: }
650:
651: # ------------------------------------------------------- Evaluate state string
652:
653: sub evalstate {
654: my $fn=$env{'request.course.fn'}.'.state';
655: my $state='';
656: if (-e $fn) {
657: my @conditions=();
658: {
659: my $fh=Apache::File->new($fn);
660: @conditions=<$fh>;
661: }
662: my $safeeval = new Safe;
663: my $safehole = new Safe::Hole;
664: $safeeval->permit("entereval");
665: $safeeval->permit(":base_math");
666: $safeeval->deny(":base_io");
667: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
668: foreach my $line (@conditions) {
669: chomp($line);
670: my ($condition,$weight)=split(/\:/,$line);
671: if ($safeeval->reval($condition)) {
672: if ($weight eq 'force') {
673: $state.='3';
674: } else {
675: $state.='2';
676: }
677: } else {
678: if ($weight eq 'stop') {
679: $state.='0';
680: } else {
681: $state.='1';
682: }
683: }
684: }
685: }
686: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
687: return $state;
688: }
689:
690: 1;
691: __END__
692:
693: =head1 NAME
694:
695: Apache::lonuserstate - Construct and maintain state and binary representation
696: of course for user
697:
698: =head1 SYNOPSIS
699:
700: Invoked by lonroles.pm.
701:
702: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
703:
704: =head1 INTRODUCTION
705:
706: This module constructs and maintains state and binary representation
707: of course for user.
708:
709: This is part of the LearningOnline Network with CAPA project
710: described at http://www.lon-capa.org.
711:
712: =head1 HANDLER SUBROUTINE
713:
714: There is no handler subroutine.
715:
716: =head1 OTHER SUBROUTINES
717:
718: =over 4
719:
720: =item *
721:
722: loadmap() : Loads map from disk
723:
724: =item *
725:
726: simplify() : Simplify expression
727:
728: =item *
729:
730: traceroute() : Build condition hash
731:
732: =item *
733:
734: accinit() : Cascading conditions, quick access, parameters
735:
736: =item *
737:
738: readmap() : Read map and all submaps
739:
740: =item *
741:
742: evalstate() : Evaluate state string
743:
744: =back
745:
746: =cut
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