Annotation of nsdl/lonsql, revision 1.5

1.1       www         1: #!/usr/bin/perl
                      2: 
                      3: # The LearningOnline Network
1.2       www         4: # lonsql - LON TCP-NSDL Query Handler.
1.1       www         5: #
1.5     ! www         6: # $Id: lonsql,v 1.4 2005/11/17 22:51:59 www Exp $
1.1       www         7: #
                      8: # Copyright Michigan State University Board of Trustees
                      9: #
                     10: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     11: #
                     12: # LON-CAPA is free software; you can redistribute it and/or modify
                     13: # it under the terms of the GNU General Public License as published by
                     14: # the Free Software Foundation; either version 2 of the License, or
                     15: # (at your option) any later version.
                     16: #
                     17: # LON-CAPA is distributed in the hope that it will be useful,
                     18: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     19: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     20: # GNU General Public License for more details.
                     21: #
                     22: # You should have received a copy of the GNU General Public License
                     23: # along with LON-CAPA; if not, write to the Free Software
                     24: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     25: #
                     26: # /home/httpd/html/adm/gpl.txt
                     27: #
                     28: # http://www.lon-capa.org/
                     29: #
                     30: 
                     31: =pod
                     32: 
                     33: =head1 NAME
                     34: 
                     35: lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
                     36: 
                     37: =head1 SYNOPSIS
                     38: 
                     39: This script should be run as user=www.  
                     40: Note that a lonsql.pid file contains the pid of the parent process.
                     41: 
                     42: =head1 OVERVIEW
                     43: 
                     44: =head2 Purpose within LON-CAPA
                     45: 
                     46: LON-CAPA is meant to distribute A LOT of educational content to A LOT
                     47: of people. It is ineffective to directly rely on contents within the
                     48: ext2 filesystem to be speedily scanned for on-the-fly searches of
                     49: content descriptions. (Simply put, it takes a cumbersome amount of
                     50: time to open, read, analyze, and close thousands of files.)
                     51: 
                     52: The solution is to index various data fields that are descriptive of
                     53: the educational resources on a LON-CAPA server machine in a
                     54: database. Descriptive data fields are referred to as "metadata". The
                     55: question then arises as to how this metadata is handled in terms of
                     56: the rest of the LON-CAPA network without burdening client and daemon
                     57: processes.
                     58: 
                     59: The obvious solution, using lonc to send a query to a lond process,
                     60: doesn't work so well in general as you can see in the following
                     61: example:
                     62: 
                     63:     lonc= loncapa client process    A-lonc= a lonc process on Server A
                     64:     lond= loncapa daemon process
                     65: 
                     66:                  database command
                     67:     A-lonc  --------TCP/IP----------------> B-lond
                     68: 
                     69: The problem emerges that A-lonc and B-lond are kept waiting for the
                     70: MySQL server to "do its stuff", or in other words, perform the
                     71: conceivably sophisticated, data-intensive, time-sucking database
                     72: transaction.  By tying up a lonc and lond process, this significantly
                     73: cripples the capabilities of LON-CAPA servers.
                     74: 
                     75: The solution is to offload the work onto another process, and use
                     76: lonc and lond just for requests and notifications of completed
                     77: processing:
                     78: 
                     79:                 database command
                     80: 
                     81:   A-lonc  ---------TCP/IP-----------------> B-lond =====> B-lonsql
                     82:          <---------------------------------/                |
                     83:            "ok, I'll get back to you..."                    |
                     84:                                                             |
                     85:                                                             /
                     86:   A-lond  <-------------------------------  B-lonc   <======
                     87:            "Guess what? I have the result!"
                     88: 
                     89: Of course, depending on success or failure, the messages may vary, but
                     90: the principle remains the same where a separate pool of children
                     91: processes (lonsql's) handle the MySQL database manipulations.
                     92: 
                     93: Thus, lonc and lond spend effectively no time waiting on results from
                     94: the database.
                     95: 
                     96: =head1 Internals
                     97: 
                     98: =over 4
                     99: 
                    100: =cut
                    101: 
                    102: use strict;
                    103: 
                    104: use lib '/home/httpd/lib/perl/';
                    105: use LONCAPA::Configuration;
                    106: use LONCAPA::lonmetadata();
                    107: 
                    108: use IO::Socket;
                    109: use Symbol;
                    110: use POSIX;
                    111: use IO::Select;
                    112: use IO::File;
                    113: use Socket;
                    114: use Fcntl;
                    115: use Tie::RefHash;
1.3       www       116: use HTML::LCParser();
                    117: use LWP::UserAgent();
                    118: use HTTP::Headers;
                    119: use HTTP::Date;
1.1       www       120: use File::Find;
                    121: use localenroll;
                    122: 
                    123: ########################################################
                    124: ########################################################
                    125: 
                    126: =pod 
                    127: 
                    128: =item Variables required for forking
                    129: 
                    130: =over 4
                    131: 
                    132: =item $MAX_CLIENTS_PER_CHILD
                    133: 
                    134: The number of clients each child should process.
                    135: 
                    136: =item %children 
                    137: 
                    138: The keys to %children  are the current child process IDs
                    139: 
                    140: =item $children
                    141: 
                    142: The current number of children
                    143: 
                    144: =back
                    145: 
                    146: =cut 
                    147: 
                    148: ########################################################
                    149: ########################################################
                    150: my $MAX_CLIENTS_PER_CHILD  = 5;   # number of clients each child should process
                    151: my %children               = ();  # keys are current child process IDs
                    152: my $children               = 0;   # current number of children
                    153:                                
                    154: ###################################################################
                    155: ###################################################################
                    156: 
                    157: =pod
                    158: 
                    159: =item Main body of code.
                    160: 
                    161: =over 4
                    162: 
                    163: =item Read data from loncapa_apache.conf and loncapa.conf.
                    164: 
                    165: =item Ensure we can access the database.
                    166: 
                    167: =item Determine if there are other instances of lonsql running.
                    168: 
                    169: =item Read the hosts file.
                    170: 
                    171: =item Create a socket for lonsql.
                    172: 
                    173: =item Fork once and dissociate from parent.
                    174: 
                    175: =item Write PID to disk.
                    176: 
                    177: =item Prefork children and maintain the population of children.
                    178: 
                    179: =back
                    180: 
                    181: =cut
                    182: 
                    183: ###################################################################
                    184: ###################################################################
                    185: my $childmaxattempts=10;
                    186: my $run =0;              # running counter to generate the query-id
                    187: #
                    188: # Read loncapa_apache.conf and loncapa.conf
                    189: #
                    190: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
                    191: my %perlvar=%{$perlvarref};
                    192: #
                    193: # Write the /home/www/.my.cnf file 
                    194: my $conf_file = '/home/www/.my.cnf';
                    195: if (! -e $conf_file) {
                    196:     if (open MYCNF, ">$conf_file") {
                    197:         print MYCNF <<"ENDMYCNF";
                    198: [client]
                    199: user=www
                    200: password=$perlvar{'lonSqlAccess'}
                    201: ENDMYCNF
                    202:         close MYCNF;
                    203:     } else {
                    204:         warn "Unable to write $conf_file, continuing";
                    205:     }
                    206: }
                    207: 
                    208: 
                    209: #
                    210: # Check if other instance running
                    211: #
                    212: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
                    213: if (-e $pidfile) {
                    214:    my $lfh=IO::File->new("$pidfile");
                    215:    my $pide=<$lfh>;
                    216:    chomp($pide);
                    217:    if (kill 0 => $pide) { die "already running"; }
                    218: }
                    219: 
                    220: #
                    221: # Read hosts file
                    222: #
                    223: my $thisserver;
                    224: my $PREFORK=4; # number of children to maintain, at least four spare
                    225: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                    226: while (my $configline=<CONFIG>) {
                    227:     my ($id,$domain,$role,$name)=split(/:/,$configline);
                    228:     $name=~s/\s//g;
                    229:     $thisserver=$name if ($id eq $perlvar{'lonHostID'});
                    230:     #$PREFORK++;
                    231: }
                    232: close(CONFIG);
                    233: #
                    234: #$PREFORK=int($PREFORK/4);
                    235: 
                    236: #
                    237: # Create a socket to talk to lond
                    238: #
                    239: my $unixsock = "mysqlsock";
                    240: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
                    241: my $server;
                    242: unlink ($localfile);
                    243: unless ($server=IO::Socket::UNIX->new(Local    =>"$localfile",
                    244:                                       Type    => SOCK_STREAM,
                    245:                                       Listen => 10)) {
                    246:     print "in socket error:$@\n";
                    247: }
                    248: 
                    249: #
                    250: # Fork once and dissociate
                    251: #
                    252: my $fpid=fork;
                    253: exit if $fpid;
                    254: die "Couldn't fork: $!" unless defined ($fpid);
                    255: POSIX::setsid() or die "Can't start new session: $!";
                    256: 
                    257: #
                    258: # Write our PID on disk
                    259: my $execdir=$perlvar{'lonDaemons'};
                    260: open (PIDSAVE,">$execdir/logs/lonsql.pid");
                    261: print PIDSAVE "$$\n";
                    262: close(PIDSAVE);
                    263: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
                    264: 
                    265: #
                    266: # Ignore signals generated during initial startup
                    267: $SIG{HUP}=$SIG{USR1}='IGNORE';
                    268: # Now we are on our own    
                    269: #    Fork off our children.
                    270: for (1 .. $PREFORK) {
                    271:     make_new_child();
                    272: }
                    273: 
                    274: #
                    275: # Install signal handlers.
                    276: $SIG{CHLD} = \&REAPER;
                    277: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                    278: $SIG{HUP}  = \&HUPSMAN;
                    279: 
                    280: #
                    281: # And maintain the population.
                    282: while (1) {
                    283:     sleep;                          # wait for a signal (i.e., child's death)
                    284:     for (my $i = $children; $i < $PREFORK; $i++) {
                    285:         make_new_child();           # top up the child pool
                    286:     }
                    287: }
                    288: 
                    289: ########################################################
                    290: ########################################################
                    291: 
                    292: =pod
                    293: 
                    294: =item &make_new_child
                    295: 
                    296: Inputs: None
                    297: 
                    298: Returns: None
                    299: 
                    300: =cut
                    301: 
                    302: ########################################################
                    303: ########################################################
                    304: sub make_new_child {
                    305:     my $pid;
                    306:     my $sigset;
                    307:     #
                    308:     # block signal for fork
                    309:     $sigset = POSIX::SigSet->new(SIGINT);
                    310:     sigprocmask(SIG_BLOCK, $sigset)
                    311:         or die "Can't block SIGINT for fork: $!\n";
                    312:     #
                    313:     die "fork: $!" unless defined ($pid = fork);
                    314:     #
                    315:     if ($pid) {
                    316:         # Parent records the child's birth and returns.
                    317:         sigprocmask(SIG_UNBLOCK, $sigset)
                    318:             or die "Can't unblock SIGINT for fork: $!\n";
                    319:         $children{$pid} = 1;
                    320:         $children++;
                    321:         return;
                    322:     } else {
                    323:         # Child can *not* return from this subroutine.
                    324:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
                    325:         # unblock signals
                    326:         sigprocmask(SIG_UNBLOCK, $sigset)
                    327:             or die "Can't unblock SIGINT for fork: $!\n";
1.2       www       328: 
1.1       www       329: 	$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
                    330:         # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
                    331:         for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
                    332:             my $client = $server->accept() or last;
                    333:             # do something with the connection
                    334: 	    $run = $run+1;
                    335: 	    my $userinput = <$client>;
                    336: 	    chomp($userinput);
                    337:             #
                    338: 	    my ($conserver,$query,
                    339: 		$arg1,$arg2,$arg3)=split(/&/,$userinput);
                    340: 	    my $query=unescape($query);
                    341:             #
                    342:             #send query id which is pid_unixdatetime_runningcounter
                    343: 	    my $queryid = $thisserver;
                    344: 	    $queryid .="_".($$)."_";
                    345: 	    $queryid .= time."_";
                    346: 	    $queryid .= $run;
                    347: 	    print $client "$queryid\n";
                    348: 	    #
                    349: 	    # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
                    350: 	    sleep 1;
                    351:             #
                    352:             my $result='';
                    353:             #
                    354:             # At this point, query is received, query-ID assigned and sent 
                    355:             # back, $query eq 'logquery' will mean that this is a query 
                    356:             # against log-files
                    357:             if (($query eq 'userlog') || ($query eq 'courselog')) {
                    358:                 # beginning of log query
                    359:                 my $udom    = &unescape($arg1);
                    360:                 my $uname   = &unescape($arg2);
                    361:                 my $command = &unescape($arg3);
                    362:                 my $path    = &propath($udom,$uname);
                    363:                 if (-e "$path/activity.log") {
                    364:                     if ($query eq 'userlog') {
                    365:                         $result=&userlog($path,$command);
                    366:                     } else {
                    367:                         $result=&courselog($path,$command);
                    368:                     }
                    369:                 } else {
                    370:                     &logthis('Unable to do log query: '.$uname.'@'.$udom);
                    371:                     $result='no_such_file';
                    372:                 }
                    373:                 # end of log query
                    374:             } elsif ($query eq 'fetchenrollment') {
                    375:                 # retrieve institutional class lists
                    376:                 my $dom = &unescape($arg1);
                    377:                 my %affiliates = ();
                    378:                 my %replies = ();
                    379:                 my $locresult = '';
                    380:                 my $querystr = &unescape($arg3);
                    381:                 foreach (split/%%/,$querystr) {
1.2       www       382:                     if (/^([^=]+)=([^=]+)$/) {
1.1       www       383:                         @{$affiliates{$1}} = split/,/,$2;
                    384:                     }
                    385:                 }
                    386:                 $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
                    387:                 $result = &escape($locresult.':');
                    388:                 if ($locresult) {
                    389:                     $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
                    390:                 }
                    391:             } elsif ($query eq 'prepare activity log') {
                    392:                 my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
                    393:                 &logthis('preparing activity log tables for '.$cid);
                    394:                 my $command = 
                    395:                     qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
                    396:                 system($command);
                    397:                 &logthis($command);
                    398:                 my $returnvalue = $?>>8;
                    399:                 if ($returnvalue) {
                    400:                     $result = 'error: parse_activity_log.pl returned '.
                    401:                         $returnvalue;
                    402:                 } else {
                    403:                     $result = 'success';
                    404:                 }
                    405:             } else {
                    406:                 # Do an sql query
                    407:                 $result = &do_sql_query($query,$arg1,$arg2);
                    408:             }
                    409:             # result does not need to be escaped because it has already been
                    410:             # escaped.
                    411:             #$result=&escape($result);
                    412:             &reply("queryreply:$queryid:$result",$conserver);
                    413:         }
                    414:         # tidy up gracefully and finish
                    415:         #
1.2       www       416: 
1.1       www       417:         # this exit is VERY important, otherwise the child will become
                    418:         # a producer of more and more children, forking yourself into
                    419:         # process death.
                    420:         exit;
                    421:     }
                    422: }
                    423: 
                    424: ########################################################
                    425: ########################################################
                    426: 
                    427: =pod
                    428: 
                    429: =item &do_sql_query
                    430: 
                    431: Runs an sql metadata table query.
                    432: 
                    433: Inputs: $query, $custom, $customshow
                    434: 
                    435: Returns: A string containing escaped results.
                    436: 
                    437: =cut
                    438: 
                    439: ########################################################
                    440: ########################################################
                    441: {
                    442:     my @metalist;
                    443: 
                    444: sub process_file {
                    445:     if ( -e $_ &&  # file exists
                    446:          -f $_ &&  # and is a normal file
                    447:          /\.meta$/ &&  # ends in meta
                    448:          ! /^.+\.\d+\.[^\.]+\.meta$/  # is not a previous version
                    449:          ) {
                    450:         push(@metalist,$File::Find::name);
                    451:     }
                    452: }
                    453: 
                    454: sub do_sql_query {
1.2       www       455:     my ($query) = @_;
1.1       www       456:     &logthis('doing query '.$query);
1.2       www       457:  
1.1       www       458:     my @results = ();
1.2       www       459:  
1.1       www       460:     #
                    461:     if ($query) {
                    462:         #prepare and execute the query
1.2       www       463: 	my $aref=&nsdl_query($query);
                    464: 	foreach my $row (@$aref) {
                    465: 	    my @b=map { &escape($_); } @$row;
                    466: 	    push @results,join(",", @b);
                    467: 	}
                    468:         
1.1       www       469:     }
1.2       www       470:     return join("&",@results);
1.1       www       471: } # End of &do_sql_query
                    472: 
                    473: } # End of scoping curly braces for &process_file and &do_sql_query
                    474: ########################################################
                    475: ########################################################
                    476: 
                    477: =pod
                    478: 
                    479: =item &logthis
                    480: 
                    481: Inputs: $message, the message to log
                    482: 
                    483: Returns: nothing
                    484: 
                    485: Writes $message to the logfile.
                    486: 
                    487: =cut
                    488: 
                    489: ########################################################
                    490: ########################################################
                    491: sub logthis {
                    492:     my $message=shift;
                    493:     my $execdir=$perlvar{'lonDaemons'};
                    494:     my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
                    495:     my $now=time;
                    496:     my $local=localtime($now);
                    497:     print $fh "$local ($$): $message\n";
                    498: }
                    499: 
                    500: # -------------------------------------------------- Non-critical communication
                    501: 
                    502: ########################################################
                    503: ########################################################
                    504: 
                    505: =pod
                    506: 
                    507: =item &subreply
                    508: 
                    509: Sends a command to a server.  Called only by &reply.
                    510: 
                    511: Inputs: $cmd,$server
                    512: 
                    513: Returns: The results of the message or 'con_lost' on error.
                    514: 
                    515: =cut
                    516: 
                    517: ########################################################
                    518: ########################################################
                    519: sub subreply {
                    520:     my ($cmd,$server)=@_;
                    521:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                    522:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                    523:                                       Type    => SOCK_STREAM,
                    524:                                       Timeout => 10)
                    525:        or return "con_lost";
                    526:     print $sclient "$cmd\n";
                    527:     my $answer=<$sclient>;
                    528:     chomp($answer);
                    529:     $answer="con_lost" if (!$answer);
                    530:     return $answer;
                    531: }
                    532: 
                    533: ########################################################
                    534: ########################################################
                    535: 
                    536: =pod
                    537: 
                    538: =item &reply
                    539: 
                    540: Sends a command to a server.
                    541: 
                    542: Inputs: $cmd,$server
                    543: 
                    544: Returns: The results of the message or 'con_lost' on error.
                    545: 
                    546: =cut
                    547: 
                    548: ########################################################
                    549: ########################################################
                    550: sub reply {
                    551:   my ($cmd,$server)=@_;
                    552:   my $answer;
                    553:   if ($server ne $perlvar{'lonHostID'}) { 
                    554:     $answer=subreply($cmd,$server);
                    555:     if ($answer eq 'con_lost') {
                    556: 	$answer=subreply("ping",$server);
                    557:         $answer=subreply($cmd,$server);
                    558:     }
                    559:   } else {
                    560:     $answer='self_reply';
                    561:     $answer=subreply($cmd,$server);
                    562:   } 
                    563:   return $answer;
                    564: }
                    565: 
                    566: ########################################################
                    567: ########################################################
                    568: 
                    569: =pod
                    570: 
                    571: =item &escape
                    572: 
                    573: Escape special characters in a string.
                    574: 
                    575: Inputs: string to escape
                    576: 
                    577: Returns: The input string with special characters escaped.
                    578: 
                    579: =cut
                    580: 
                    581: ########################################################
                    582: ########################################################
                    583: sub escape {
                    584:     my $str=shift;
                    585:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                    586:     return $str;
                    587: }
                    588: 
                    589: ########################################################
                    590: ########################################################
                    591: 
                    592: =pod
                    593: 
                    594: =item &unescape
                    595: 
                    596: Unescape special characters in a string.
                    597: 
                    598: Inputs: string to unescape
                    599: 
                    600: Returns: The input string with special characters unescaped.
                    601: 
                    602: =cut
                    603: 
                    604: ########################################################
                    605: ########################################################
                    606: sub unescape {
                    607:     my $str=shift;
                    608:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                    609:     return $str;
                    610: }
                    611: 
                    612: ########################################################
                    613: ########################################################
                    614: 
                    615: =pod
                    616: 
                    617: =item &ishome
                    618: 
                    619: Determine if the current machine is the home server for a user.
                    620: The determination is made by checking the filesystem for the users information.
                    621: 
                    622: Inputs: $author
                    623: 
                    624: Returns: 0 - this is not the authors home server, 1 - this is.
                    625: 
                    626: =cut
                    627: 
                    628: ########################################################
                    629: ########################################################
                    630: sub ishome {
                    631:     my $author=shift;
                    632:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                    633:     my ($udom,$uname)=split(/\//,$author);
                    634:     my $proname=propath($udom,$uname);
                    635:     if (-e $proname) {
                    636: 	return 1;
                    637:     } else {
                    638:         return 0;
                    639:     }
                    640: }
                    641: 
                    642: ########################################################
                    643: ########################################################
                    644: 
                    645: =pod
                    646: 
                    647: =item &propath
                    648: 
                    649: Inputs: user name, user domain
                    650: 
                    651: Returns: The full path to the users directory.
                    652: 
                    653: =cut
                    654: 
                    655: ########################################################
                    656: ########################################################
                    657: sub propath {
                    658:     my ($udom,$uname)=@_;
                    659:     $udom=~s/\W//g;
                    660:     $uname=~s/\W//g;
                    661:     my $subdir=$uname.'__';
                    662:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                    663:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                    664:     return $proname;
                    665: } 
                    666: 
                    667: ########################################################
                    668: ########################################################
                    669: 
                    670: =pod
                    671: 
                    672: =item &courselog
                    673: 
                    674: Inputs: $path, $command
                    675: 
                    676: Returns: unescaped string of values.
                    677: 
                    678: =cut
                    679: 
                    680: ########################################################
                    681: ########################################################
                    682: sub courselog {
                    683:     my ($path,$command)=@_;
                    684:     my %filters=();
                    685:     foreach (split(/\:/,&unescape($command))) {
                    686: 	my ($name,$value)=split(/\=/,$_);
                    687:         $filters{$name}=$value;
                    688:     }
                    689:     my @results=();
                    690:     open(IN,$path.'/activity.log') or return ('file_error');
                    691:     while (my $line=<IN>) {
                    692:         chomp($line);
                    693:         my ($timestamp,$host,$log)=split(/\:/,$line);
                    694: #
                    695: # $log has the actual log entries; currently still escaped, and
                    696: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
                    697: # then additionally
                    698: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
                    699: # or
                    700: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
                    701: #
                    702: # get delimiter between timestamped entries to be &&&
                    703:         $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
                    704: # now go over all log entries 
                    705:         foreach (split(/\&\&\&/,&unescape($log))) {
                    706: 	    my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
                    707:             my $values=&unescape(join(':',@values));
                    708:             $values=~s/\&/\:/g;
                    709:             $res=&unescape($res);
                    710:             my $include=1;
                    711:             if (($filters{'username'}) && ($uname ne $filters{'username'})) 
                    712:                                                                { $include=0; }
                    713:             if (($filters{'domain'}) && ($udom ne $filters{'domain'})) 
                    714:                                                                { $include=0; }
                    715:             if (($filters{'url'}) && ($res!~/$filters{'url'}/)) 
                    716:                                                                { $include=0; }
                    717:             if (($filters{'start'}) && ($time<$filters{'start'})) 
                    718:                                                                { $include=0; }
                    719:             if (($filters{'end'}) && ($time>$filters{'end'})) 
                    720:                                                                { $include=0; }
                    721:             if (($filters{'action'} eq 'view') && ($action)) 
                    722:                                                                { $include=0; }
                    723:             if (($filters{'action'} eq 'submit') && ($action ne 'POST')) 
                    724:                                                                { $include=0; }
                    725:             if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE')) 
                    726:                                                                { $include=0; }
                    727:             if ($include) {
                    728: 	       push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
                    729:                                             $uname.':'.$udom.':'.
                    730:                                             $action.':'.$values);
                    731:             }
                    732:        }
                    733:     }
                    734:     close IN;
                    735:     return join('&',sort(@results));
                    736: }
                    737: 
                    738: ########################################################
                    739: ########################################################
                    740: 
                    741: =pod
                    742: 
                    743: =item &userlog
                    744: 
                    745: Inputs: $path, $command
                    746: 
                    747: Returns: unescaped string of values.
                    748: 
                    749: =cut
                    750: 
                    751: ########################################################
                    752: ########################################################
                    753: sub userlog {
                    754:     my ($path,$command)=@_;
                    755:     my %filters=();
                    756:     foreach (split(/\:/,&unescape($command))) {
                    757: 	my ($name,$value)=split(/\=/,$_);
                    758:         $filters{$name}=$value;
                    759:     }
                    760:     my @results=();
                    761:     open(IN,$path.'/activity.log') or return ('file_error');
                    762:     while (my $line=<IN>) {
                    763:         chomp($line);
                    764:         my ($timestamp,$host,$log)=split(/\:/,$line);
                    765:         $log=&unescape($log);
                    766:         my $include=1;
                    767:         if (($filters{'start'}) && ($timestamp<$filters{'start'})) 
                    768:                                                              { $include=0; }
                    769:         if (($filters{'end'}) && ($timestamp>$filters{'end'})) 
                    770:                                                              { $include=0; }
                    771:         if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
                    772:         if (($filters{'action'} eq 'check') && ($log!~/^Check/)) 
                    773:                                                              { $include=0; }
                    774:         if ($include) {
                    775: 	   push(@results,$timestamp.':'.$log);
                    776:         }
                    777:     }
                    778:     close IN;
                    779:     return join('&',sort(@results));
                    780: }
                    781: 
                    782: ########################################################
                    783: ########################################################
                    784: 
                    785: =pod
                    786: 
                    787: =item Functions required for forking
                    788: 
                    789: =over 4
                    790: 
                    791: =item REAPER
                    792: 
                    793: REAPER takes care of dead children.
                    794: 
                    795: =item HUNTSMAN
                    796: 
                    797: Signal handler for SIGINT.
                    798: 
                    799: =item HUPSMAN
                    800: 
                    801: Signal handler for SIGHUP
                    802: 
                    803: =item DISCONNECT
                    804: 
                    805: Disconnects from database.
                    806: 
                    807: =back
                    808: 
                    809: =cut
                    810: 
                    811: ########################################################
                    812: ########################################################
                    813: sub REAPER {                   # takes care of dead children
                    814:     $SIG{CHLD} = \&REAPER;
                    815:     my $pid = wait;
                    816:     $children --;
                    817:     &logthis("Child $pid died");
                    818:     delete $children{$pid};
                    819: }
                    820: 
                    821: sub HUNTSMAN {                      # signal handler for SIGINT
                    822:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                    823:     kill 'INT' => keys %children;
                    824:     my $execdir=$perlvar{'lonDaemons'};
                    825:     unlink("$execdir/logs/lonsql.pid");
                    826:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
                    827:     $unixsock = "mysqlsock";
                    828:     my $port="$perlvar{'lonSockDir'}/$unixsock";
                    829:     unlink($port);
                    830:     exit;                           # clean up with dignity
                    831: }
                    832: 
                    833: sub HUPSMAN {                      # signal handler for SIGHUP
                    834:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
                    835:     kill 'INT' => keys %children;
                    836:     close($server);                # free up socket
                    837:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
                    838:     my $execdir=$perlvar{'lonDaemons'};
                    839:     $unixsock = "mysqlsock";
                    840:     my $port="$perlvar{'lonSockDir'}/$unixsock";
                    841:     unlink($port);
                    842:     exec("$execdir/lonsql");         # here we go again
                    843: }
                    844: 
1.2       www       845: #
                    846: # Takes SQL query
                    847: # sends it to NSDL
                    848: # has to return array reference
                    849: #
1.1       www       850: 
1.2       www       851: sub nsdl_query {
                    852:     my $query=shift;
1.3       www       853:     my ($keyword)=($query=~/\"\%([^\%]+)\%\"/);
                    854:     $keyword=&escape($keyword);
                    855:     &logthis('Doing '.$keyword);
                    856:     my $url='http://search.nsdl.org?verb=Search&s=0&n=500&q='.$keyword;
                    857:     my $ua=new LWP::UserAgent;
                    858:     my $response=$ua->get($url);
1.4       www       859:     my $parser=HTML::LCParser->new(\$response->content);
                    860:     my %result=();
                    861:     my $is=();
                    862:     my $cont='';
                    863:     my $array=[];
                    864:     my $token;
                    865:     while ($token=$parser->get_token) {
                    866: 	if ($token->[0] eq 'T') {
                    867: 	    $cont.=$token->[1];
                    868: 	} elsif ($token->[0] eq 'S') {
                    869: 	    if ($token->[1] eq 'record') {
                    870: 		%result=();
1.5     ! www       871: 	    } elsif ($token->[1]=~/^dc\:/) {
1.4       www       872: 		$is=$token->[1];
                    873: 		$cont='';
                    874: 	    }
                    875: 	} elsif ($token->[0] eq 'E') {
                    876: 	    if ($token->[1] eq 'record') {
                    877: #
                    878: # Now store it away
                    879: #
1.5     ! www       880: 	    } elsif ($token->[1]=~/^dc\:/) {
1.4       www       881: 		$result{$is}=$cont;
                    882: 	    }
                    883: 	}
                    884:     }
                    885:     return $array;
1.3       www       886: }
1.1       www       887: 
                    888: =pod
                    889: 
                    890: =back
                    891: 
                    892: =cut

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