rat/lonuserstate.pm - view

File: [LON-CAPA] / rat / lonuserstate.pm
Revision 1.121: download - view: text, annotated - select for diffs
Tue Aug 28 01:09:14 2007 UTC (16 years, 8 months ago) by albertel
Branches: MAIN
CVS tags: HEAD

- appears advanced rat can leaving <param> deifitions for deleted resources
  hanging around, ignore any mapalias that are set to apply to resources
  that don't exist

1: # The LearningOnline Network with CAPA 2: # Construct and maintain state and binary representation of course for user 3: # 4: # $Id: lonuserstate.pm,v 1.121 2007/08/28 01:09:14 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: $errtext.=''. 112: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>'). 113: ''; 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: $errtext.=&mt(" Invalid map: <tt>[_1]</tt>",$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_)*randompick$/) { 297: $randompick{$referid}=$token->[2]->{'value'}; 298: } 299: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { 300: $randompickseed{$referid}=$token->[2]->{'value'}; 301: } 302: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) { 303: if ($token->[2]->{'value'}=~/^yes$/i) { 304: $encurl{$referid}=1; 305: } 306: } 307: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) { 308: if ($token->[2]->{'value'}=~/^yes$/i) { 309: $hiddenurl{$referid}=1; 310: } 311: } 312: } 313: 314: } 315: } 316: 317: } else { 318: $errtext.=&mt(' Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn); 319: } 320: 321: my $parser = HTML::TokeParser->new(\$instr); 322: $parser->attr_encoded(1); 323: # last parse out the mapalias params so as to ignore anything 324: # refering to non-existant resources 325: while (my $token = $parser->get_token) { 326: next if ($token->[0] ne 'S'); 327: if ($token->[1] eq 'param') { 328: &parse_mapalias_param($token,$lpc); 329: } 330: } 331: } 332: 333: sub parse_mapalias_param { 334: my ($token,$lpc) = @_; 335: my $referid=$lpc.'.'.$token->[2]->{'to'}; 336: return if (!exists($hash{'src_'.$referid})); 337: 338: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) { 339: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid; 340: } 341: } 342: 343: # --------------------------------------------------------- Simplify expression 344: 345: sub simplify { 346: my $expression=shift; 347: # (0&1) = 1 348: $expression=~s/$0\&([_\.\d]+)$/$1/g; 349: # (8)=8 350: $expression=~s/$([_\.\d]+)$/$1/g; 351: # 8&8=8 352: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g; 353: # 8|8=8 354: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g; 355: # (5&3)&4=5&3&4 356: $expression=~s/$([_\.\d]+)((?:\&[_\.\d]+)+)$\&([_\.\d]+[^_\.\d])/$1$2\&$3/g; 357: # (((5&3)|(4&6)))=((5&3)|(4&6)) 358: $expression=~ 359: s/$(\(\([_\.\d]+(?:\&[_\.\d]+)*$(?:\|$[_\.\d]+(?:\&[_\.\d]+)*$)+\))\)/$1/g; 360: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) 361: $expression=~ 362: s/$(\([_\.\d]+(?:\&[_\.\d]+)*$)((?:\|$[_\.\d]+(?:\&[_\.\d]+)*$)+)\)\|($[_\.\d]+(?:\&[_\.\d]+)*$)/$$1$2\|$3$/g; 363: return $expression; 364: } 365: 366: # -------------------------------------------------------- Build condition hash 367: 368: sub traceroute { 369: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_; 370: my $newsofar=$sofar=simplify($sofar); 371: unless ($beenhere=~/\&\Q$rid\E\&/) { 372: $beenhere.=$rid.'&'; 373: my ($mapid,$resid)=split(/\./,$rid); 374: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid}); 375: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb); 376: 377: if ($hdnflag || lc($hidden) eq 'yes') { 378: $hiddenurl{$rid}=1; 379: } 380: if (!$hdnflag && lc($hidden) eq 'no') { 381: delete($hiddenurl{$rid}); 382: } 383: 384: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb); 385: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; } 386: if (($retfrid eq '') && ($hash{'src_'.$rid}) 387: && ($hash{'src_'.$rid}!~/\.sequence$/)) { 388: $retfrid=$rid; 389: } 390: if (defined($hash{'conditions_'.$rid})) { 391: $hash{'conditions_'.$rid}=simplify( 392: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); 393: } else { 394: $hash{'conditions_'.$rid}=$sofar; 395: } 396: 397: # if the expression is just the 0th condition keep it 398: # otherwise leave a pointer to this condition expression 399: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid; 400: 401: if (defined($hash{'is_map_'.$rid})) { 402: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { 403: $sofar=$newsofar= 404: &traceroute($sofar, 405: $hash{'map_start_'.$hash{'src_'.$rid}},'&', 406: $encflag || $encurl{$rid}, 407: $hdnflag || $hiddenurl{$rid}); 408: } 409: } 410: if (defined($hash{'to_'.$rid})) { 411: foreach my $id (split(/\,/,$hash{'to_'.$rid})) { 412: my $further=$sofar; 413: if ($hash{'undercond_'.$id}) { 414: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) { 415: $further=simplify('('.'_'.$rid.')&('. 416: $hash{'condid_'.$hash{'undercond_'.$id}}.')'); 417: } else { 418: $errtext.=&mt(' Undefined condition ID: [_1]',$hash{'undercond_'.$id}); 419: } 420: } 421: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere, 422: $encflag,$hdnflag); 423: } 424: } 425: } 426: return $newsofar; 427: } 428: 429: # ------------------------------ Cascading conditions, quick access, parameters 430: 431: sub accinit { 432: my ($uri,$short,$fn)=@_; 433: my %acchash=(); 434: my %captured=(); 435: my $condcounter=0; 436: $acchash{'acc.cond.'.$short.'.0'}=0; 437: foreach my $key (keys(%hash)) { 438: if ($key=~/^conditions/) { 439: my $expr=$hash{$key}; 440: # try to find and factor out common sub-expressions 441: foreach my $sub ($expr=~m/($\([_\.\d]+(?:\&[_\.\d]+)+$(?:\|$[_\.\d]+(?:\&[_\.\d]+)+$)+\))/g) { 442: my $orig=$sub; 443: 444: my ($factor) = ($sub=~/$\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+$(?:\|$\1(?:[_\.\d]+\&*)+$)+\)/); 445: next if (!defined($factor)); 446: 447: $sub=~s/\Q$factor\E//g; 448: $sub=~s/^\(/\($factor\(/; 449: $sub.=')'; 450: $sub=simplify($sub); 451: $expr=~s/\Q$orig\E/$sub/; 452: } 453: $hash{$key}=$expr; 454: unless (defined($captured{$expr})) { 455: $condcounter++; 456: $captured{$expr}=$condcounter; 457: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; 458: } 459: } elsif ($key=~/^param_(\d+)\.(\d+)/) { 460: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2, 461: $hash{'src_'.$1.'.'.$2}); 462: foreach my $param (split(/\&/,$hash{$key})) { 463: my ($typename,$value)=split(/\=/,$param); 464: my ($type,$name)=split(/\:/,$typename); 465: $parmhash{$prefix.'.'.&unescape($name)}= 466: &unescape($value); 467: $parmhash{$prefix.'.'.&unescape($name).'.type'}= 468: &unescape($type); 469: } 470: } 471: } 472: foreach my $key (keys(%hash)) { 473: if ($key=~/^ids/) { 474: foreach my $resid (split(/\,/,$hash{$key})) { 475: my $uri=$hash{'src_'.$resid}; 476: my ($uripath,$urifile) = 477: &Apache::lonnet::split_uri_for_cond($uri); 478: if ($uripath) { 479: my $uricond='0'; 480: if (defined($hash{'conditions_'.$resid})) { 481: $uricond=$captured{$hash{'conditions_'.$resid}}; 482: } 483: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) { 484: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~ 485: /(\&\Q$urifile\E\:[^\&]*)/) { 486: my $replace=$1; 487: my $regexp=$replace; 488: #$regexp=~s/\|/\\\|/g; 489: $acchash{'acc.res.'.$short.'.'.$uripath} =~ 490: s/\Q$regexp\E/$replace\|$uricond/; 491: } else { 492: $acchash{'acc.res.'.$short.'.'.$uripath}.= 493: $urifile.':'.$uricond.'&'; 494: } 495: } else { 496: $acchash{'acc.res.'.$short.'.'.$uripath}= 497: '&'.$urifile.':'.$uricond.'&'; 498: } 499: } 500: } 501: } 502: } 503: $acchash{'acc.res.'.$short.'.'}='&:0&'; 504: my $courseuri=$uri; 505: $courseuri=~s/^\/res\///; 506: &Apache::lonnet::delenv('(acc\.|httpref\.)'); 507: &Apache::lonnet::appenv(%acchash); 508: } 509: 510: # ---------------- Selectively delete from randompick maps and hidden url parms 511: 512: sub hiddenurls { 513: my $randomoutentry=''; 514: foreach my $rid (keys %randompick) { 515: my $rndpick=$randompick{$rid}; 516: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}}; 517: # ------------------------------------------- put existing resources into array 518: my @currentrids=(); 519: foreach my $key (sort(keys(%hash))) { 520: if ($key=~/^src_($mpc\.\d+)/) { 521: if ($hash{'src_'.$1}) { push @currentrids, $1; } 522: } 523: } 524: # rids are number.number and we want to numercially sort on 525: # the second number 526: @currentrids=sort { 527: my (undef,$aid)=split(/\./,$a); 528: my (undef,$bid)=split(/\./,$b); 529: $aid <=> $bid; 530: } @currentrids; 531: next if ($#currentrids<$rndpick); 532: # -------------------------------- randomly eliminate the ones that should stay 533: my (undef,$id)=split(/\./,$rid); 534: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; } 535: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb 536: &Apache::lonnet::setup_random_from_rndseed($rndseed); 537: my @whichids=&Math::Random::random_permuted_index($#currentrids+1); 538: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; } 539: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids)); 540: # -------------------------------------------------------- delete the leftovers 541: for (my $k=0; $k<=$#currentrids; $k++) { 542: if ($currentrids[$k]) { 543: $hash{'randomout_'.$currentrids[$k]}=1; 544: my ($mapid,$resid)=split(/\./,$currentrids[$k]); 545: $randomoutentry.='&'. 546: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, 547: $resid, 548: $hash{'src_'.$currentrids[$k]} 549: ).'&'; 550: } 551: } 552: } 553: # ------------------------------ take care of explicitly hidden urls or folders 554: foreach my $rid (keys %hiddenurl) { 555: $hash{'randomout_'.$rid}=1; 556: my ($mapid,$resid)=split(/\./,$rid); 557: $randomoutentry.='&'. 558: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid, 559: $hash{'src_'.$rid}).'&'; 560: } 561: # --------------------------------------- append randomout entry to environment 562: if ($randomoutentry) { 563: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry); 564: } 565: } 566: 567: # ---------------------------------------------------- Read map and all submaps 568: 569: sub readmap { 570: my $short=shift; 571: $short=~s/^\///; 572: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1}); 573: my $fn=$cenv{'fn'}; 574: my $uri; 575: $short=~s/\//\_/g; 576: unless ($uri=$cenv{'url'}) { 577: &Apache::lonnet::logthis("WARNING: ". 578: "Could not load course $short."); 579: return ('',&mt('No course data available.'));; 580: } 581: @cond=('true:normal'); 582: 583: open(LOCKFILE,">$fn.db.lock"); 584: my $lock=0; 585: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) { 586: $lock=1; 587: unlink($fn.'.db'); 588: unlink($fn.'_symb.db'); 589: unlink($fn.'.state'); 590: unlink($fn.'parms.db'); 591: } 592: undef %randompick; 593: undef %hiddenurl; 594: undef %encurl; 595: $retfrid=''; 596: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) && 597: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) { 598: %hash=(); 599: %parmhash=(); 600: $errtext=''; 601: $pc=0; 602: &processversionfile(%cenv); 603: my $furi=&Apache::lonnet::clutter($uri); 604: $hash{'src_0.0'}=&versiontrack($furi); 605: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title'); 606: $hash{'ids_'.$furi}='0.0'; 607: $hash{'is_map_0.0'}=1; 608: loadmap($uri); 609: if (defined($hash{'map_start_'.$uri})) { 610: &Apache::lonnet::appenv("request.course.id" => $short, 611: "request.course.fn" => $fn, 612: "request.course.uri" => $uri); 613: $env{'request.course.id'}=$short; 614: &traceroute('0',$hash{'map_start_'.$uri},'&'); 615: &accinit($uri,$short,$fn); 616: &hiddenurls(); 617: } 618: # ------------------------------------------------------- Put versions into src 619: foreach my $key (keys(%hash)) { 620: if ($key=~/^src_/) { 621: $hash{$key}=&putinversion($hash{$key}); 622: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) { 623: my ($type, $url) = ($1,$2); 624: my $value = $hash{$key}; 625: $hash{$type.&putinversion($url)}=$value; 626: } 627: } 628: # ---------------------------------------------------------------- Encrypt URLs 629: foreach my $id (keys(%encurl)) { 630: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id}); 631: $hash{'encrypted_'.$id}=1; 632: } 633: # ----------------------------------------------- Close hashes to finally store 634: # --------------------------------- Routine must pass this point, no early outs 635: $hash{'first_rid'}=$retfrid; 636: my ($mapid,$resid)=split(/\./,$retfrid); 637: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid}; 638: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid}); 639: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb }); 640: if ($hash{'encrypted_'.$retfrid}) { 641: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F')); 642: } 643: $hash{'first_url'}=$retfurl; 644: unless ((untie(%hash)) && (untie(%parmhash))) { 645: &Apache::lonnet::logthis("WARNING: ". 646: "Could not untie coursemap $fn for $uri."); 647: } 648: # ---------------------------------------------------- Store away initial state 649: { 650: my $cfh; 651: if (open($cfh,">$fn.state")) { 652: print $cfh join("\n",@cond); 653: } else { 654: &Apache::lonnet::logthis("WARNING: ". 655: "Could not write statemap $fn for $uri."); 656: } 657: } 658: flock(LOCKFILE,LOCK_UN); 659: close(LOCKFILE); 660: } else { 661: # if we are here it is likely because we are already trying to 662: # initialize the course in another child, busy wait trying to 663: # tie the hashes for the next 90 seconds, if we succeed forward 664: # them on to navmaps, if we fail, throw up the Could not init 665: # course screen 666: if ($lock) { 667: # Got the lock but not the DB files 668: flock(LOCKFILE,LOCK_UN); 669: } 670: untie(%hash); 671: untie(%parmhash); 672: &Apache::lonnet::logthis("WARNING: ". 673: "Could not tie coursemap $fn for $uri."); 674: my $i=0; 675: while($i<90) { 676: $i++; 677: sleep(1); 678: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) && 679: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) { 680: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) { 681: $retfurl='/adm/navmaps'; 682: &Apache::lonnet::appenv("request.course.id" => $short, 683: "request.course.fn" => $fn, 684: "request.course.uri" => $uri); 685: untie(%hash); 686: untie(%parmhash); 687: last; 688: } 689: } 690: untie(%hash); 691: untie(%parmhash); 692: } 693: flock(LOCKFILE,LOCK_UN); 694: close(LOCKFILE); 695: } 696: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext); 697: # ------------------------------------------------- Check for critical messages 698: 699: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'}, 700: $env{'user.name'}); 701: if ($what[0]) { 702: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { 703: $retfurl='/adm/email?critical=display'; 704: } 705: } 706: return ($retfurl,$errtext); 707: } 708: 709: # ------------------------------------------------------- Evaluate state string 710: 711: sub evalstate { 712: my $fn=$env{'request.course.fn'}.'.state'; 713: my $state=''; 714: if (-e $fn) { 715: my @conditions=(); 716: { 717: open(my $fh,"<$fn"); 718: @conditions=<$fh>; 719: close($fh); 720: } 721: my $safeeval = new Safe; 722: my $safehole = new Safe::Hole; 723: $safeeval->permit("entereval"); 724: $safeeval->permit(":base_math"); 725: $safeeval->deny(":base_io"); 726: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); 727: foreach my $line (@conditions) { 728: chomp($line); 729: my ($condition,$weight)=split(/\:/,$line); 730: if ($safeeval->reval($condition)) { 731: if ($weight eq 'force') { 732: $state.='3'; 733: } else { 734: $state.='2'; 735: } 736: } else { 737: if ($weight eq 'stop') { 738: $state.='0'; 739: } else { 740: $state.='1'; 741: } 742: } 743: } 744: } 745: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state); 746: return $state; 747: } 748: 749: 1; 750: __END__ 751: 752: =head1 NAME 753: 754: Apache::lonuserstate - Construct and maintain state and binary representation 755: of course for user 756: 757: =head1 SYNOPSIS 758: 759: Invoked by lonroles.pm. 760: 761: &Apache::lonuserstate::readmap($cdom.'/'.$cnum); 762: 763: =head1 INTRODUCTION 764: 765: This module constructs and maintains state and binary representation 766: of course for user. 767: 768: This is part of the LearningOnline Network with CAPA project 769: described at http://www.lon-capa.org. 770: 771: =head1 HANDLER SUBROUTINE 772: 773: There is no handler subroutine. 774: 775: =head1 OTHER SUBROUTINES 776: 777: =over 4 778: 779: =item * 780: 781: loadmap() : Loads map from disk 782: 783: =item * 784: 785: simplify() : Simplify expression 786: 787: =item * 788: 789: traceroute() : Build condition hash 790: 791: =item * 792: 793: accinit() : Cascading conditions, quick access, parameters 794: 795: =item * 796: 797: readmap() : Read map and all submaps 798: 799: =item * 800: 801: evalstate() : Evaluate state string 802: 803: =back 804: 805: =cut