rat/lonuserstate.pm - view

File: [LON-CAPA] / rat / lonuserstate.pm
Revision 1.118.2.1: download - view: text, annotated - select for diffs
Fri Jun 8 19:33:06 2007 UTC (16 years, 10 months ago) by albertel
Branches: randomize
Diff to branchpoint 1.118: preferred, unified

- implements the internals for randomizing the order of resources in a map
   - works by ignoring all <link>s in the map, collecting the list
     of resources and then <link>s them in a random order
     it throws all of that away and then makes a random linear map
   - works correctly with 'pick n resources'

   - TODO
      - currently always on and does all maps, needs conversion to using a parm
      - currently different ordering everytime you reinit a course
      - currently affects everyone

1: # The LearningOnline Network with CAPA 2: # Construct and maintain state and binary representation of course for user 3: # 4: # $Id: lonuserstate.pm,v 1.118.2.1 2007/06/08 19:33:06 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: $errtext.=&mt(' Multiple use of sequence/page <tt>[_1]</tt>! The course will not function properly.',$uri); 112: return; 113: } 114: $pc++; 115: my $lpc=$pc; 116: $hash{'map_pc_'.$uri}=$lpc; 117: $hash{'map_id_'.$lpc}=$uri; 118: 119: # Determine and check filename 120: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri)); 121: 122: my $ispage=($fn=~/\.page$/); 123: 124: unless (($fn=~/\.sequence$/) || 125: ($fn=~/\.page$/)) { 126: $errtext.=&mt(" Invalid map: <tt>[_1]</tt>",$fn); 127: return; 128: } 129: 130: my $instr=&Apache::lonnet::getfile($fn); 131: 132: if ($instr eq -1) { 133: $errtext.=&mt(' Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn); 134: return; 135: } 136: 137: # Successfully got file, parse it 138: 139: my $parser = HTML::TokeParser->new(\$instr); 140: $parser->attr_encoded(1); 141: 142: my $linkpc=0; 143: 144: $fn=~/\.(\w+)$/; 145: 146: $hash{'map_type_'.$lpc}=$1; 147: 148: my $randomize=1; 149: my @map_ids; 150: while (my $token = $parser->get_token) { 151: next if ($token->[0] ne 'S'); 152: if ($token->[1] eq 'resource') { 153: push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri)); 154: } elsif ($token->[1] eq 'link' && !$randomize) { 155: # ----------------------------------------------------------------------- Links 156: &make_link(++$linkpc,$lpc,$token->[2]->{'to'}, 157: $token->[2]->{'from'}, 158: $token->[2]->{'condition'}); 159: } elsif ($token->[1] eq 'condition' && !$randomize) { 160: &parse_condition($token,$lpc); 161: } elsif ($token->[1] eq 'param') { 162: &parse_param($token,$lpc); 163: } 164: } 165: 166: if ($randomize) { 167: my @map_ids=&Math::Random::random_permutation(@map_ids); 168: my $from = shift(@map_ids); 169: my $from_rid = $lpc.'.'.$from; 170: $hash{'map_start_'.$uri} = $from_rid; 171: $hash{'type_'.$from_rid}='start'; 172: 173: while (my $to = shift(@map_ids)) { 174: &make_link(++$linkpc,$lpc,$to,$from); 175: my $to_rid = $lpc.'.'.$to; 176: $hash{'type_'.$to_rid}='normal'; 177: $from = $to; 178: $from_rid = $to_rid; 179: } 180: 181: $hash{'map_finish_'.$uri}= $from_rid; 182: $hash{'type_'.$from_rid}='finish'; 183: } 184: } 185: 186: 187: # -------------------------------------------------------------------- Resource 188: sub parse_resource { 189: my ($token,$lpc,$ispage,$uri) = @_; 190: if ($token->[2]->{'type'} eq 'zombie') { next; } 191: my $rid=$lpc.'.'.$token->[2]->{'id'}; 192: 193: $hash{'kind_'.$rid}='res'; 194: $hash{'title_'.$rid}=$token->[2]->{'title'}; 195: my $turi=&versiontrack($token->[2]->{'src'}); 196: if ($token->[2]->{'version'}) { 197: unless ($hash{'version_'.$turi}) { 198: $hash{'version_'.$turi}=$1; 199: } 200: } 201: my $title=$token->[2]->{'title'}; 202: $title=~s/\&colon\;/\:/gs; 203: # my $symb=&Apache::lonnet::encode_symb($uri, 204: # $token->[2]->{'id'}, 205: # $turi); 206: # &Apache::lonnet::do_cache_new('title',$symb,$title); 207: unless ($ispage) { 208: $turi=~/\.(\w+)$/; 209: my $embstyle=&Apache::loncommon::fileembstyle($1); 210: if ($token->[2]->{'external'} eq 'true') { # external 211: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//; 212: } elsif ($turi=~/^\/*uploaded\//) { # uploaded 213: if (($embstyle eq 'img') 214: || ($embstyle eq 'emb') 215: || ($embstyle eq 'wrp')) { 216: $turi='/adm/wrapper'.$turi; 217: } elsif ($embstyle eq 'ssi') { 218: #do nothing with these 219: } elsif ($turi!~/\.(sequence|page)$/) { 220: $turi='/adm/coursedocs/showdoc'.$turi; 221: } 222: } elsif ($turi=~/\S/) { # normal non-empty internal resource 223: my $mapdir=$uri; 224: $mapdir=~s/[^\/]+$//; 225: $turi=&Apache::lonnet::hreflocation($mapdir,$turi); 226: if (($embstyle eq 'img') 227: || ($embstyle eq 'emb') 228: || ($embstyle eq 'wrp')) { 229: $turi='/adm/wrapper'.$turi; 230: } 231: } 232: } 233: # Store reverse lookup, remove query string 234: my $idsuri=$turi; 235: $idsuri=~s/\?.+$//; 236: if (defined($hash{'ids_'.$idsuri})) { 237: $hash{'ids_'.$idsuri}.=','.$rid; 238: } else { 239: $hash{'ids_'.$idsuri}=''.$rid; 240: } 241: 242: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) { 243: $turi.='?register=1'; 244: } 245: 246: $hash{'src_'.$rid}=$turi; 247: 248: if ($token->[2]->{'external'} eq 'true') { 249: $hash{'ext_'.$rid}='true:'; 250: } else { 251: $hash{'ext_'.$rid}='false:'; 252: } 253: if ($token->[2]->{'type'}) { 254: $hash{'type_'.$rid}=$token->[2]->{'type'}; 255: if ($token->[2]->{'type'} eq 'start') { 256: $hash{'map_start_'.$uri}="$rid"; 257: } 258: if ($token->[2]->{'type'} eq 'finish') { 259: $hash{'map_finish_'.$uri}="$rid"; 260: } 261: } else { 262: $hash{'type_'.$rid}='normal'; 263: } 264: 265: if (($turi=~/\.sequence$/) || 266: ($turi=~/\.page$/)) { 267: $hash{'is_map_'.$rid}=1; 268: &loadmap($turi); 269: } 270: return $token->[2]->{'id'}; 271: } 272: 273: sub make_link { 274: my ($linkpc,$lpc,$to,$from,$condition) = @_; 275: 276: my $linkid=$lpc.'.'.$linkpc; 277: my $goesto=$lpc.'.'.$to; 278: my $comesfrom=$lpc.'.'.$from; 279: my $undercond=0; 280: 281: if ($condition) { 282: $undercond=$lpc.'.'.$condition; 283: } 284: 285: $hash{'goesto_'.$linkid}=$goesto; 286: $hash{'comesfrom_'.$linkid}=$comesfrom; 287: $hash{'undercond_'.$linkid}=$undercond; 288: 289: if (defined($hash{'to_'.$comesfrom})) { 290: $hash{'to_'.$comesfrom}.=','.$linkid; 291: } else { 292: $hash{'to_'.$comesfrom}=''.$linkid; 293: } 294: if (defined($hash{'from_'.$goesto})) { 295: $hash{'from_'.$goesto}.=','.$linkid; 296: } else { 297: $hash{'from_'.$goesto}=''.$linkid; 298: } 299: } 300: 301: # ------------------------------------------------------------------- Condition 302: sub parse_condition { 303: my ($token,$lpc) = @_; 304: my $rid=$lpc.'.'.$token->[2]->{'id'}; 305: 306: $hash{'kind_'.$rid}='cond'; 307: $cond[$#cond+1]=$token->[2]->{'value'}; 308: $hash{'condid_'.$rid}=$#cond; 309: if ($token->[2]->{'type'}) { 310: $cond[$#cond].=':'.$token->[2]->{'type'}; 311: } else { 312: $cond[$#cond].=':normal'; 313: } 314: } 315: 316: # ------------------------------------------------------------------- Parameter 317: 318: sub parse_param { 319: my ($token,$lpc) = @_; 320: my $referid=$lpc.'.'.$token->[2]->{'to'}; 321: my $name=$token->[2]->{'name'}; 322: my $part; 323: if ($name=~/^parameter_(.*)_/) { 324: $part=$1; 325: } else { 326: $part=0; 327: } 328: $name=~s/^.*_([^_]*)$/$1/; 329: my $newparam= 330: &escape($token->[2]->{'type'}).':'. 331: &escape($part.'.'.$name).'='. 332: &escape($token->[2]->{'value'}); 333: if (defined($hash{'param_'.$referid})) { 334: $hash{'param_'.$referid}.='&'.$newparam; 335: } else { 336: $hash{'param_'.$referid}=''.$newparam; 337: } 338: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) { 339: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid; 340: } 341: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { 342: $randompick{$referid}=$token->[2]->{'value'}; 343: } 344: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { 345: $randompick{$referid}=$token->[2]->{'value'}; 346: } 347: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) { 348: if ($token->[2]->{'value'}=~/^yes$/i) { 349: $encurl{$referid}=1; 350: } 351: } 352: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) { 353: if ($token->[2]->{'value'}=~/^yes$/i) { 354: $hiddenurl{$referid}=1; 355: } 356: } 357: } 358: 359: # --------------------------------------------------------- Simplify expression 360: 361: sub simplify { 362: my $expression=shift; 363: # (0&1) = 1 364: $expression=~s/$0\&([_\.\d]+)$/$1/g; 365: # (8)=8 366: $expression=~s/$([_\.\d]+)$/$1/g; 367: # 8&8=8 368: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g; 369: # 8|8=8 370: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g; 371: # (5&3)&4=5&3&4 372: $expression=~s/$([_\.\d]+)((?:\&[_\.\d]+)+)$\&([_\.\d]+[^_\.\d])/$1$2\&$3/g; 373: # (((5&3)|(4&6)))=((5&3)|(4&6)) 374: $expression=~ 375: s/$(\(\([_\.\d]+(?:\&[_\.\d]+)*$(?:\|$[_\.\d]+(?:\&[_\.\d]+)*$)+\))\)/$1/g; 376: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) 377: $expression=~ 378: s/$(\([_\.\d]+(?:\&[_\.\d]+)*$)((?:\|$[_\.\d]+(?:\&[_\.\d]+)*$)+)\)\|($[_\.\d]+(?:\&[_\.\d]+)*$)/$$1$2\|$3$/g; 379: return $expression; 380: } 381: 382: # -------------------------------------------------------- Build condition hash 383: 384: sub traceroute { 385: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_; 386: my $newsofar=$sofar=simplify($sofar); 387: unless ($beenhere=~/\&$rid\&/) { 388: $beenhere.=$rid.'&'; 389: my ($mapid,$resid)=split(/\./,$rid); 390: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid}); 391: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb); 392: 393: if ($hdnflag || lc($hidden) eq 'yes') { 394: $hiddenurl{$rid}=1; 395: } 396: if (!$hdnflag && lc($hidden) eq 'no') { 397: delete($hiddenurl{$rid}); 398: } 399: 400: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb); 401: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; } 402: if (($retfrid eq '') && ($hash{'src_'.$rid}) 403: && ($hash{'src_'.$rid}!~/\.sequence$/)) { 404: $retfrid=$rid; 405: } 406: if (defined($hash{'conditions_'.$rid})) { 407: $hash{'conditions_'.$rid}=simplify( 408: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); 409: } else { 410: $hash{'conditions_'.$rid}=$sofar; 411: } 412: 413: # if the expression is just the 0th condition keep it 414: # otherwise leave a pointer to this condition expression 415: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid; 416: 417: if (defined($hash{'is_map_'.$rid})) { 418: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { 419: $sofar=$newsofar= 420: &traceroute($sofar, 421: $hash{'map_start_'.$hash{'src_'.$rid}},'&', 422: $encflag || $encurl{$rid}, 423: $hdnflag || $hiddenurl{$rid}); 424: } 425: } 426: if (defined($hash{'to_'.$rid})) { 427: foreach my $id (split(/\,/,$hash{'to_'.$rid})) { 428: my $further=$sofar; 429: if ($hash{'undercond_'.$id}) { 430: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) { 431: $further=simplify('('.'_'.$rid.')&('. 432: $hash{'condid_'.$hash{'undercond_'.$id}}.')'); 433: } else { 434: $errtext.=&mt(' Undefined condition ID: [_1]',$hash{'undercond_'.$id}); 435: } 436: } 437: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere, 438: $encflag,$hdnflag); 439: } 440: } 441: } 442: return $newsofar; 443: } 444: 445: # ------------------------------ Cascading conditions, quick access, parameters 446: 447: sub accinit { 448: my ($uri,$short,$fn)=@_; 449: my %acchash=(); 450: my %captured=(); 451: my $condcounter=0; 452: $acchash{'acc.cond.'.$short.'.0'}=0; 453: foreach my $key (keys(%hash)) { 454: if ($key=~/^conditions/) { 455: my $expr=$hash{$key}; 456: # try to find and factor out common sub-expressions 457: foreach my $sub ($expr=~m/($\([_\.\d]+(?:\&[_\.\d]+)+$(?:\|$[_\.\d]+(?:\&[_\.\d]+)+$)+\))/g) { 458: my $orig=$sub; 459: 460: my ($factor) = ($sub=~/$\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+$(?:\|$\1(?:[_\.\d]+\&*)+$)+\)/); 461: next if (!defined($factor)); 462: 463: $sub=~s/\Q$factor\E//g; 464: $sub=~s/^\(/\($factor\(/; 465: $sub.=')'; 466: $sub=simplify($sub); 467: $expr=~s/\Q$orig\E/$sub/; 468: } 469: $hash{$key}=$expr; 470: unless (defined($captured{$expr})) { 471: $condcounter++; 472: $captured{$expr}=$condcounter; 473: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; 474: } 475: } elsif ($key=~/^param_(\d+)\.(\d+)/) { 476: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2, 477: $hash{'src_'.$1.'.'.$2}); 478: foreach my $param (split(/\&/,$hash{$key})) { 479: my ($typename,$value)=split(/\=/,$param); 480: my ($type,$name)=split(/\:/,$typename); 481: $parmhash{$prefix.'.'.&unescape($name)}= 482: &unescape($value); 483: $parmhash{$prefix.'.'.&unescape($name).'.type'}= 484: &unescape($type); 485: } 486: } 487: } 488: foreach my $key (keys(%hash)) { 489: if ($key=~/^ids/) { 490: foreach my $resid (split(/\,/,$hash{$key})) { 491: my $uri=$hash{'src_'.$resid}; 492: my ($uripath,$urifile) = 493: &Apache::lonnet::split_uri_for_cond($uri); 494: if ($uripath) { 495: my $uricond='0'; 496: if (defined($hash{'conditions_'.$resid})) { 497: $uricond=$captured{$hash{'conditions_'.$resid}}; 498: } 499: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) { 500: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~ 501: /(\&\Q$urifile\E\:[^\&]*)/) { 502: my $replace=$1; 503: my $regexp=$replace; 504: #$regexp=~s/\|/\\\|/g; 505: $acchash{'acc.res.'.$short.'.'.$uripath} =~ 506: s/\Q$regexp\E/$replace\|$uricond/; 507: } else { 508: $acchash{'acc.res.'.$short.'.'.$uripath}.= 509: $urifile.':'.$uricond.'&'; 510: } 511: } else { 512: $acchash{'acc.res.'.$short.'.'.$uripath}= 513: '&'.$urifile.':'.$uricond.'&'; 514: } 515: } 516: } 517: } 518: } 519: $acchash{'acc.res.'.$short.'.'}='&:0&'; 520: my $courseuri=$uri; 521: $courseuri=~s/^\/res\///; 522: &Apache::lonnet::delenv('(acc\.|httpref\.)'); 523: &Apache::lonnet::appenv(%acchash); 524: } 525: 526: # ---------------- Selectively delete from randompick maps and hidden url parms 527: 528: sub hiddenurls { 529: my $randomoutentry=''; 530: foreach my $rid (keys %randompick) { 531: my $rndpick=$randompick{$rid}; 532: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}}; 533: # ------------------------------------------- put existing resources into array 534: my @currentrids=(); 535: foreach my $key (sort(keys(%hash))) { 536: if ($key=~/^src_($mpc\.\d+)/) { 537: if ($hash{'src_'.$1}) { push @currentrids, $1; } 538: } 539: } 540: # rids are number.number and we want to numercially sort on 541: # the second number 542: @currentrids=sort { 543: my (undef,$aid)=split(/\./,$a); 544: my (undef,$bid)=split(/\./,$b); 545: $aid <=> $bid; 546: } @currentrids; 547: next if ($#currentrids<$rndpick); 548: # -------------------------------- randomly eliminate the ones that should stay 549: my (undef,$id)=split(/\./,$rid); 550: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; } 551: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb 552: &Apache::lonnet::setup_random_from_rndseed($rndseed); 553: my @whichids=&Math::Random::random_permuted_index($#currentrids+1); 554: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; } 555: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids)); 556: # -------------------------------------------------------- delete the leftovers 557: for (my $k=0; $k<=$#currentrids; $k++) { 558: if ($currentrids[$k]) { 559: $hash{'randomout_'.$currentrids[$k]}=1; 560: my ($mapid,$resid)=split(/\./,$currentrids[$k]); 561: $randomoutentry.='&'. 562: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, 563: $resid, 564: $hash{'src_'.$currentrids[$k]} 565: ).'&'; 566: } 567: } 568: } 569: # ------------------------------ take care of explicitly hidden urls or folders 570: foreach my $rid (keys %hiddenurl) { 571: $hash{'randomout_'.$rid}=1; 572: my ($mapid,$resid)=split(/\./,$rid); 573: $randomoutentry.='&'. 574: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid, 575: $hash{'src_'.$rid}).'&'; 576: } 577: # --------------------------------------- append randomout entry to environment 578: if ($randomoutentry) { 579: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry); 580: } 581: } 582: 583: # ---------------------------------------------------- Read map and all submaps 584: 585: sub readmap { 586: my $short=shift; 587: $short=~s/^\///; 588: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1}); 589: my $fn=$cenv{'fn'}; 590: my $uri; 591: $short=~s/\//\_/g; 592: unless ($uri=$cenv{'url'}) { 593: &Apache::lonnet::logthis("WARNING: ". 594: "Could not load course $short."); 595: return ('',&mt('No course data available.'));; 596: } 597: @cond=('true:normal'); 598: 599: open(LOCKFILE,">$fn.db.lock"); 600: my $lock=0; 601: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) { 602: $lock=1; 603: unlink($fn.'.db'); 604: unlink($fn.'_symb.db'); 605: unlink($fn.'.state'); 606: unlink($fn.'parms.db'); 607: } 608: undef %randompick; 609: undef %hiddenurl; 610: undef %encurl; 611: $retfrid=''; 612: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) && 613: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) { 614: %hash=(); 615: %parmhash=(); 616: $errtext=''; 617: $pc=0; 618: &processversionfile(%cenv); 619: my $furi=&Apache::lonnet::clutter($uri); 620: $hash{'src_0.0'}=&versiontrack($furi); 621: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title'); 622: $hash{'ids_'.$furi}='0.0'; 623: $hash{'is_map_0.0'}=1; 624: loadmap($uri); 625: if (defined($hash{'map_start_'.$uri})) { 626: &Apache::lonnet::appenv("request.course.id" => $short, 627: "request.course.fn" => $fn, 628: "request.course.uri" => $uri); 629: $env{'request.course.id'}=$short; 630: &traceroute('0',$hash{'map_start_'.$uri},'&'); 631: &accinit($uri,$short,$fn); 632: &hiddenurls(); 633: } 634: # ------------------------------------------------------- Put versions into src 635: foreach my $key (keys(%hash)) { 636: if ($key=~/^src_/) { 637: $hash{$key}=&putinversion($hash{$key}); 638: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) { 639: my ($type, $url) = ($1,$2); 640: my $value = $hash{$key}; 641: $hash{$type.&putinversion($url)}=$value; 642: } 643: } 644: # ---------------------------------------------------------------- Encrypt URLs 645: foreach my $id (keys(%encurl)) { 646: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id}); 647: $hash{'encrypted_'.$id}=1; 648: } 649: # ----------------------------------------------- Close hashes to finally store 650: # --------------------------------- Routine must pass this point, no early outs 651: $hash{'first_rid'}=$retfrid; 652: my ($mapid,$resid)=split(/\./,$retfrid); 653: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid}; 654: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid}); 655: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb }); 656: if ($hash{'encrypted_'.$retfrid}) { 657: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F')); 658: } 659: $hash{'first_url'}=$retfurl; 660: unless ((untie(%hash)) && (untie(%parmhash))) { 661: &Apache::lonnet::logthis("WARNING: ". 662: "Could not untie coursemap $fn for $uri."); 663: } 664: # ---------------------------------------------------- Store away initial state 665: { 666: my $cfh; 667: if (open($cfh,">$fn.state")) { 668: print $cfh join("\n",@cond); 669: } else { 670: &Apache::lonnet::logthis("WARNING: ". 671: "Could not write statemap $fn for $uri."); 672: } 673: } 674: flock(LOCKFILE,LOCK_UN); 675: close(LOCKFILE); 676: } else { 677: # if we are here it is likely because we are already trying to 678: # initialize the course in another child, busy wait trying to 679: # tie the hashes for the next 90 seconds, if we succeed forward 680: # them on to navmaps, if we fail, throw up the Could not init 681: # course screen 682: if ($lock) { 683: # Got the lock but not the DB files 684: flock(LOCKFILE,LOCK_UN); 685: } 686: untie(%hash); 687: untie(%parmhash); 688: &Apache::lonnet::logthis("WARNING: ". 689: "Could not tie coursemap $fn for $uri."); 690: my $i=0; 691: while($i<90) { 692: $i++; 693: sleep(1); 694: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) && 695: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) { 696: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) { 697: $retfurl='/adm/navmaps'; 698: &Apache::lonnet::appenv("request.course.id" => $short, 699: "request.course.fn" => $fn, 700: "request.course.uri" => $uri); 701: untie(%hash); 702: untie(%parmhash); 703: last; 704: } 705: } 706: untie(%hash); 707: untie(%parmhash); 708: } 709: flock(LOCKFILE,LOCK_UN); 710: close(LOCKFILE); 711: } 712: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext); 713: # ------------------------------------------------- Check for critical messages 714: 715: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'}, 716: $env{'user.name'}); 717: if ($what[0]) { 718: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { 719: $retfurl='/adm/email?critical=display'; 720: } 721: } 722: return ($retfurl,$errtext); 723: } 724: 725: # ------------------------------------------------------- Evaluate state string 726: 727: sub evalstate { 728: my $fn=$env{'request.course.fn'}.'.state'; 729: my $state=''; 730: if (-e $fn) { 731: my @conditions=(); 732: { 733: open(my $fh,"<$fn"); 734: @conditions=<$fh>; 735: close($fh); 736: } 737: my $safeeval = new Safe; 738: my $safehole = new Safe::Hole; 739: $safeeval->permit("entereval"); 740: $safeeval->permit(":base_math"); 741: $safeeval->deny(":base_io"); 742: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); 743: foreach my $line (@conditions) { 744: chomp($line); 745: my ($condition,$weight)=split(/\:/,$line); 746: if ($safeeval->reval($condition)) { 747: if ($weight eq 'force') { 748: $state.='3'; 749: } else { 750: $state.='2'; 751: } 752: } else { 753: if ($weight eq 'stop') { 754: $state.='0'; 755: } else { 756: $state.='1'; 757: } 758: } 759: } 760: } 761: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state); 762: return $state; 763: } 764: 765: 1; 766: __END__ 767: 768: =head1 NAME 769: 770: Apache::lonuserstate - Construct and maintain state and binary representation 771: of course for user 772: 773: =head1 SYNOPSIS 774: 775: Invoked by lonroles.pm. 776: 777: &Apache::lonuserstate::readmap($cdom.'/'.$cnum); 778: 779: =head1 INTRODUCTION 780: 781: This module constructs and maintains state and binary representation 782: of course for user. 783: 784: This is part of the LearningOnline Network with CAPA project 785: described at http://www.lon-capa.org. 786: 787: =head1 HANDLER SUBROUTINE 788: 789: There is no handler subroutine. 790: 791: =head1 OTHER SUBROUTINES 792: 793: =over 4 794: 795: =item * 796: 797: loadmap() : Loads map from disk 798: 799: =item * 800: 801: simplify() : Simplify expression 802: 803: =item * 804: 805: traceroute() : Build condition hash 806: 807: =item * 808: 809: accinit() : Cascading conditions, quick access, parameters 810: 811: =item * 812: 813: readmap() : Read map and all submaps 814: 815: =item * 816: 817: evalstate() : Evaluate state string 818: 819: =back 820: 821: =cut