Annotation of nsdl/lonsql, revision 1.2

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: #
1.2     ! www         6: # $Id: lonsql,v 1.68 2005/11/07 15:43:03 raeburn 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;
1.2     ! www       116: 
1.1       www       117: use File::Find;
                    118: use localenroll;
                    119: 
                    120: ########################################################
                    121: ########################################################
                    122: 
                    123: =pod 
                    124: 
                    125: =item Variables required for forking
                    126: 
                    127: =over 4
                    128: 
                    129: =item $MAX_CLIENTS_PER_CHILD
                    130: 
                    131: The number of clients each child should process.
                    132: 
                    133: =item %children 
                    134: 
                    135: The keys to %children  are the current child process IDs
                    136: 
                    137: =item $children
                    138: 
                    139: The current number of children
                    140: 
                    141: =back
                    142: 
                    143: =cut 
                    144: 
                    145: ########################################################
                    146: ########################################################
                    147: my $MAX_CLIENTS_PER_CHILD  = 5;   # number of clients each child should process
                    148: my %children               = ();  # keys are current child process IDs
                    149: my $children               = 0;   # current number of children
                    150:                                
                    151: ###################################################################
                    152: ###################################################################
                    153: 
                    154: =pod
                    155: 
                    156: =item Main body of code.
                    157: 
                    158: =over 4
                    159: 
                    160: =item Read data from loncapa_apache.conf and loncapa.conf.
                    161: 
                    162: =item Ensure we can access the database.
                    163: 
                    164: =item Determine if there are other instances of lonsql running.
                    165: 
                    166: =item Read the hosts file.
                    167: 
                    168: =item Create a socket for lonsql.
                    169: 
                    170: =item Fork once and dissociate from parent.
                    171: 
                    172: =item Write PID to disk.
                    173: 
                    174: =item Prefork children and maintain the population of children.
                    175: 
                    176: =back
                    177: 
                    178: =cut
                    179: 
                    180: ###################################################################
                    181: ###################################################################
                    182: my $childmaxattempts=10;
                    183: my $run =0;              # running counter to generate the query-id
                    184: #
                    185: # Read loncapa_apache.conf and loncapa.conf
                    186: #
                    187: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
                    188: my %perlvar=%{$perlvarref};
                    189: #
                    190: # Write the /home/www/.my.cnf file 
                    191: my $conf_file = '/home/www/.my.cnf';
                    192: if (! -e $conf_file) {
                    193:     if (open MYCNF, ">$conf_file") {
                    194:         print MYCNF <<"ENDMYCNF";
                    195: [client]
                    196: user=www
                    197: password=$perlvar{'lonSqlAccess'}
                    198: ENDMYCNF
                    199:         close MYCNF;
                    200:     } else {
                    201:         warn "Unable to write $conf_file, continuing";
                    202:     }
                    203: }
                    204: 
                    205: 
                    206: #
                    207: # Check if other instance running
                    208: #
                    209: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
                    210: if (-e $pidfile) {
                    211:    my $lfh=IO::File->new("$pidfile");
                    212:    my $pide=<$lfh>;
                    213:    chomp($pide);
                    214:    if (kill 0 => $pide) { die "already running"; }
                    215: }
                    216: 
                    217: #
                    218: # Read hosts file
                    219: #
                    220: my $thisserver;
                    221: my $PREFORK=4; # number of children to maintain, at least four spare
                    222: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                    223: while (my $configline=<CONFIG>) {
                    224:     my ($id,$domain,$role,$name)=split(/:/,$configline);
                    225:     $name=~s/\s//g;
                    226:     $thisserver=$name if ($id eq $perlvar{'lonHostID'});
                    227:     #$PREFORK++;
                    228: }
                    229: close(CONFIG);
                    230: #
                    231: #$PREFORK=int($PREFORK/4);
                    232: 
                    233: #
                    234: # Create a socket to talk to lond
                    235: #
                    236: my $unixsock = "mysqlsock";
                    237: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
                    238: my $server;
                    239: unlink ($localfile);
                    240: unless ($server=IO::Socket::UNIX->new(Local    =>"$localfile",
                    241:                                       Type    => SOCK_STREAM,
                    242:                                       Listen => 10)) {
                    243:     print "in socket error:$@\n";
                    244: }
                    245: 
                    246: #
                    247: # Fork once and dissociate
                    248: #
                    249: my $fpid=fork;
                    250: exit if $fpid;
                    251: die "Couldn't fork: $!" unless defined ($fpid);
                    252: POSIX::setsid() or die "Can't start new session: $!";
                    253: 
                    254: #
                    255: # Write our PID on disk
                    256: my $execdir=$perlvar{'lonDaemons'};
                    257: open (PIDSAVE,">$execdir/logs/lonsql.pid");
                    258: print PIDSAVE "$$\n";
                    259: close(PIDSAVE);
                    260: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
                    261: 
                    262: #
                    263: # Ignore signals generated during initial startup
                    264: $SIG{HUP}=$SIG{USR1}='IGNORE';
                    265: # Now we are on our own    
                    266: #    Fork off our children.
                    267: for (1 .. $PREFORK) {
                    268:     make_new_child();
                    269: }
                    270: 
                    271: #
                    272: # Install signal handlers.
                    273: $SIG{CHLD} = \&REAPER;
                    274: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                    275: $SIG{HUP}  = \&HUPSMAN;
                    276: 
                    277: #
                    278: # And maintain the population.
                    279: while (1) {
                    280:     sleep;                          # wait for a signal (i.e., child's death)
                    281:     for (my $i = $children; $i < $PREFORK; $i++) {
                    282:         make_new_child();           # top up the child pool
                    283:     }
                    284: }
                    285: 
                    286: ########################################################
                    287: ########################################################
                    288: 
                    289: =pod
                    290: 
                    291: =item &make_new_child
                    292: 
                    293: Inputs: None
                    294: 
                    295: Returns: None
                    296: 
                    297: =cut
                    298: 
                    299: ########################################################
                    300: ########################################################
                    301: sub make_new_child {
                    302:     my $pid;
                    303:     my $sigset;
                    304:     #
                    305:     # block signal for fork
                    306:     $sigset = POSIX::SigSet->new(SIGINT);
                    307:     sigprocmask(SIG_BLOCK, $sigset)
                    308:         or die "Can't block SIGINT for fork: $!\n";
                    309:     #
                    310:     die "fork: $!" unless defined ($pid = fork);
                    311:     #
                    312:     if ($pid) {
                    313:         # Parent records the child's birth and returns.
                    314:         sigprocmask(SIG_UNBLOCK, $sigset)
                    315:             or die "Can't unblock SIGINT for fork: $!\n";
                    316:         $children{$pid} = 1;
                    317:         $children++;
                    318:         return;
                    319:     } else {
                    320:         # Child can *not* return from this subroutine.
                    321:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
                    322:         # unblock signals
                    323:         sigprocmask(SIG_UNBLOCK, $sigset)
                    324:             or die "Can't unblock SIGINT for fork: $!\n";
1.2     ! www       325: 
1.1       www       326: 	$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
                    327:         # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
                    328:         for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
                    329:             my $client = $server->accept() or last;
                    330:             # do something with the connection
                    331: 	    $run = $run+1;
                    332: 	    my $userinput = <$client>;
                    333: 	    chomp($userinput);
                    334:             #
                    335: 	    my ($conserver,$query,
                    336: 		$arg1,$arg2,$arg3)=split(/&/,$userinput);
                    337: 	    my $query=unescape($query);
                    338:             #
                    339:             #send query id which is pid_unixdatetime_runningcounter
                    340: 	    my $queryid = $thisserver;
                    341: 	    $queryid .="_".($$)."_";
                    342: 	    $queryid .= time."_";
                    343: 	    $queryid .= $run;
                    344: 	    print $client "$queryid\n";
                    345: 	    #
                    346: 	    # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
                    347: 	    sleep 1;
                    348:             #
                    349:             my $result='';
                    350:             #
                    351:             # At this point, query is received, query-ID assigned and sent 
                    352:             # back, $query eq 'logquery' will mean that this is a query 
                    353:             # against log-files
                    354:             if (($query eq 'userlog') || ($query eq 'courselog')) {
                    355:                 # beginning of log query
                    356:                 my $udom    = &unescape($arg1);
                    357:                 my $uname   = &unescape($arg2);
                    358:                 my $command = &unescape($arg3);
                    359:                 my $path    = &propath($udom,$uname);
                    360:                 if (-e "$path/activity.log") {
                    361:                     if ($query eq 'userlog') {
                    362:                         $result=&userlog($path,$command);
                    363:                     } else {
                    364:                         $result=&courselog($path,$command);
                    365:                     }
                    366:                 } else {
                    367:                     &logthis('Unable to do log query: '.$uname.'@'.$udom);
                    368:                     $result='no_such_file';
                    369:                 }
                    370:                 # end of log query
                    371:             } elsif ($query eq 'fetchenrollment') {
                    372:                 # retrieve institutional class lists
                    373:                 my $dom = &unescape($arg1);
                    374:                 my %affiliates = ();
                    375:                 my %replies = ();
                    376:                 my $locresult = '';
                    377:                 my $querystr = &unescape($arg3);
                    378:                 foreach (split/%%/,$querystr) {
1.2     ! www       379:                     if (/^([^=]+)=([^=]+)$/) {
1.1       www       380:                         @{$affiliates{$1}} = split/,/,$2;
                    381:                     }
                    382:                 }
                    383:                 $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
                    384:                 $result = &escape($locresult.':');
                    385:                 if ($locresult) {
                    386:                     $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
                    387:                 }
                    388:             } elsif ($query eq 'prepare activity log') {
                    389:                 my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
                    390:                 &logthis('preparing activity log tables for '.$cid);
                    391:                 my $command = 
                    392:                     qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
                    393:                 system($command);
                    394:                 &logthis($command);
                    395:                 my $returnvalue = $?>>8;
                    396:                 if ($returnvalue) {
                    397:                     $result = 'error: parse_activity_log.pl returned '.
                    398:                         $returnvalue;
                    399:                 } else {
                    400:                     $result = 'success';
                    401:                 }
                    402:             } else {
                    403:                 # Do an sql query
                    404:                 $result = &do_sql_query($query,$arg1,$arg2);
                    405:             }
                    406:             # result does not need to be escaped because it has already been
                    407:             # escaped.
                    408:             #$result=&escape($result);
                    409:             &reply("queryreply:$queryid:$result",$conserver);
                    410:         }
                    411:         # tidy up gracefully and finish
                    412:         #
1.2     ! www       413: 
1.1       www       414:         # this exit is VERY important, otherwise the child will become
                    415:         # a producer of more and more children, forking yourself into
                    416:         # process death.
                    417:         exit;
                    418:     }
                    419: }
                    420: 
                    421: ########################################################
                    422: ########################################################
                    423: 
                    424: =pod
                    425: 
                    426: =item &do_sql_query
                    427: 
                    428: Runs an sql metadata table query.
                    429: 
                    430: Inputs: $query, $custom, $customshow
                    431: 
                    432: Returns: A string containing escaped results.
                    433: 
                    434: =cut
                    435: 
                    436: ########################################################
                    437: ########################################################
                    438: {
                    439:     my @metalist;
                    440: 
                    441: sub process_file {
                    442:     if ( -e $_ &&  # file exists
                    443:          -f $_ &&  # and is a normal file
                    444:          /\.meta$/ &&  # ends in meta
                    445:          ! /^.+\.\d+\.[^\.]+\.meta$/  # is not a previous version
                    446:          ) {
                    447:         push(@metalist,$File::Find::name);
                    448:     }
                    449: }
                    450: 
                    451: sub do_sql_query {
1.2     ! www       452:     my ($query) = @_;
1.1       www       453:     &logthis('doing query '.$query);
1.2     ! www       454:  
1.1       www       455:     my @results = ();
1.2     ! www       456:  
1.1       www       457:     #
                    458:     if ($query) {
                    459:         #prepare and execute the query
1.2     ! www       460: 	my $aref=&nsdl_query($query);
        !           461: 	foreach my $row (@$aref) {
        !           462: 	    my @b=map { &escape($_); } @$row;
        !           463: 	    push @results,join(",", @b);
        !           464: 	}
        !           465:         
1.1       www       466:     }
1.2     ! www       467:     return join("&",@results);
1.1       www       468: } # End of &do_sql_query
                    469: 
                    470: } # End of scoping curly braces for &process_file and &do_sql_query
                    471: ########################################################
                    472: ########################################################
                    473: 
                    474: =pod
                    475: 
                    476: =item &logthis
                    477: 
                    478: Inputs: $message, the message to log
                    479: 
                    480: Returns: nothing
                    481: 
                    482: Writes $message to the logfile.
                    483: 
                    484: =cut
                    485: 
                    486: ########################################################
                    487: ########################################################
                    488: sub logthis {
                    489:     my $message=shift;
                    490:     my $execdir=$perlvar{'lonDaemons'};
                    491:     my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
                    492:     my $now=time;
                    493:     my $local=localtime($now);
                    494:     print $fh "$local ($$): $message\n";
                    495: }
                    496: 
                    497: # -------------------------------------------------- Non-critical communication
                    498: 
                    499: ########################################################
                    500: ########################################################
                    501: 
                    502: =pod
                    503: 
                    504: =item &subreply
                    505: 
                    506: Sends a command to a server.  Called only by &reply.
                    507: 
                    508: Inputs: $cmd,$server
                    509: 
                    510: Returns: The results of the message or 'con_lost' on error.
                    511: 
                    512: =cut
                    513: 
                    514: ########################################################
                    515: ########################################################
                    516: sub subreply {
                    517:     my ($cmd,$server)=@_;
                    518:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                    519:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                    520:                                       Type    => SOCK_STREAM,
                    521:                                       Timeout => 10)
                    522:        or return "con_lost";
                    523:     print $sclient "$cmd\n";
                    524:     my $answer=<$sclient>;
                    525:     chomp($answer);
                    526:     $answer="con_lost" if (!$answer);
                    527:     return $answer;
                    528: }
                    529: 
                    530: ########################################################
                    531: ########################################################
                    532: 
                    533: =pod
                    534: 
                    535: =item &reply
                    536: 
                    537: Sends a command to a server.
                    538: 
                    539: Inputs: $cmd,$server
                    540: 
                    541: Returns: The results of the message or 'con_lost' on error.
                    542: 
                    543: =cut
                    544: 
                    545: ########################################################
                    546: ########################################################
                    547: sub reply {
                    548:   my ($cmd,$server)=@_;
                    549:   my $answer;
                    550:   if ($server ne $perlvar{'lonHostID'}) { 
                    551:     $answer=subreply($cmd,$server);
                    552:     if ($answer eq 'con_lost') {
                    553: 	$answer=subreply("ping",$server);
                    554:         $answer=subreply($cmd,$server);
                    555:     }
                    556:   } else {
                    557:     $answer='self_reply';
                    558:     $answer=subreply($cmd,$server);
                    559:   } 
                    560:   return $answer;
                    561: }
                    562: 
                    563: ########################################################
                    564: ########################################################
                    565: 
                    566: =pod
                    567: 
                    568: =item &escape
                    569: 
                    570: Escape special characters in a string.
                    571: 
                    572: Inputs: string to escape
                    573: 
                    574: Returns: The input string with special characters escaped.
                    575: 
                    576: =cut
                    577: 
                    578: ########################################################
                    579: ########################################################
                    580: sub escape {
                    581:     my $str=shift;
                    582:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                    583:     return $str;
                    584: }
                    585: 
                    586: ########################################################
                    587: ########################################################
                    588: 
                    589: =pod
                    590: 
                    591: =item &unescape
                    592: 
                    593: Unescape special characters in a string.
                    594: 
                    595: Inputs: string to unescape
                    596: 
                    597: Returns: The input string with special characters unescaped.
                    598: 
                    599: =cut
                    600: 
                    601: ########################################################
                    602: ########################################################
                    603: sub unescape {
                    604:     my $str=shift;
                    605:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                    606:     return $str;
                    607: }
                    608: 
                    609: ########################################################
                    610: ########################################################
                    611: 
                    612: =pod
                    613: 
                    614: =item &ishome
                    615: 
                    616: Determine if the current machine is the home server for a user.
                    617: The determination is made by checking the filesystem for the users information.
                    618: 
                    619: Inputs: $author
                    620: 
                    621: Returns: 0 - this is not the authors home server, 1 - this is.
                    622: 
                    623: =cut
                    624: 
                    625: ########################################################
                    626: ########################################################
                    627: sub ishome {
                    628:     my $author=shift;
                    629:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                    630:     my ($udom,$uname)=split(/\//,$author);
                    631:     my $proname=propath($udom,$uname);
                    632:     if (-e $proname) {
                    633: 	return 1;
                    634:     } else {
                    635:         return 0;
                    636:     }
                    637: }
                    638: 
                    639: ########################################################
                    640: ########################################################
                    641: 
                    642: =pod
                    643: 
                    644: =item &propath
                    645: 
                    646: Inputs: user name, user domain
                    647: 
                    648: Returns: The full path to the users directory.
                    649: 
                    650: =cut
                    651: 
                    652: ########################################################
                    653: ########################################################
                    654: sub propath {
                    655:     my ($udom,$uname)=@_;
                    656:     $udom=~s/\W//g;
                    657:     $uname=~s/\W//g;
                    658:     my $subdir=$uname.'__';
                    659:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                    660:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                    661:     return $proname;
                    662: } 
                    663: 
                    664: ########################################################
                    665: ########################################################
                    666: 
                    667: =pod
                    668: 
                    669: =item &courselog
                    670: 
                    671: Inputs: $path, $command
                    672: 
                    673: Returns: unescaped string of values.
                    674: 
                    675: =cut
                    676: 
                    677: ########################################################
                    678: ########################################################
                    679: sub courselog {
                    680:     my ($path,$command)=@_;
                    681:     my %filters=();
                    682:     foreach (split(/\:/,&unescape($command))) {
                    683: 	my ($name,$value)=split(/\=/,$_);
                    684:         $filters{$name}=$value;
                    685:     }
                    686:     my @results=();
                    687:     open(IN,$path.'/activity.log') or return ('file_error');
                    688:     while (my $line=<IN>) {
                    689:         chomp($line);
                    690:         my ($timestamp,$host,$log)=split(/\:/,$line);
                    691: #
                    692: # $log has the actual log entries; currently still escaped, and
                    693: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
                    694: # then additionally
                    695: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
                    696: # or
                    697: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
                    698: #
                    699: # get delimiter between timestamped entries to be &&&
                    700:         $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
                    701: # now go over all log entries 
                    702:         foreach (split(/\&\&\&/,&unescape($log))) {
                    703: 	    my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
                    704:             my $values=&unescape(join(':',@values));
                    705:             $values=~s/\&/\:/g;
                    706:             $res=&unescape($res);
                    707:             my $include=1;
                    708:             if (($filters{'username'}) && ($uname ne $filters{'username'})) 
                    709:                                                                { $include=0; }
                    710:             if (($filters{'domain'}) && ($udom ne $filters{'domain'})) 
                    711:                                                                { $include=0; }
                    712:             if (($filters{'url'}) && ($res!~/$filters{'url'}/)) 
                    713:                                                                { $include=0; }
                    714:             if (($filters{'start'}) && ($time<$filters{'start'})) 
                    715:                                                                { $include=0; }
                    716:             if (($filters{'end'}) && ($time>$filters{'end'})) 
                    717:                                                                { $include=0; }
                    718:             if (($filters{'action'} eq 'view') && ($action)) 
                    719:                                                                { $include=0; }
                    720:             if (($filters{'action'} eq 'submit') && ($action ne 'POST')) 
                    721:                                                                { $include=0; }
                    722:             if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE')) 
                    723:                                                                { $include=0; }
                    724:             if ($include) {
                    725: 	       push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
                    726:                                             $uname.':'.$udom.':'.
                    727:                                             $action.':'.$values);
                    728:             }
                    729:        }
                    730:     }
                    731:     close IN;
                    732:     return join('&',sort(@results));
                    733: }
                    734: 
                    735: ########################################################
                    736: ########################################################
                    737: 
                    738: =pod
                    739: 
                    740: =item &userlog
                    741: 
                    742: Inputs: $path, $command
                    743: 
                    744: Returns: unescaped string of values.
                    745: 
                    746: =cut
                    747: 
                    748: ########################################################
                    749: ########################################################
                    750: sub userlog {
                    751:     my ($path,$command)=@_;
                    752:     my %filters=();
                    753:     foreach (split(/\:/,&unescape($command))) {
                    754: 	my ($name,$value)=split(/\=/,$_);
                    755:         $filters{$name}=$value;
                    756:     }
                    757:     my @results=();
                    758:     open(IN,$path.'/activity.log') or return ('file_error');
                    759:     while (my $line=<IN>) {
                    760:         chomp($line);
                    761:         my ($timestamp,$host,$log)=split(/\:/,$line);
                    762:         $log=&unescape($log);
                    763:         my $include=1;
                    764:         if (($filters{'start'}) && ($timestamp<$filters{'start'})) 
                    765:                                                              { $include=0; }
                    766:         if (($filters{'end'}) && ($timestamp>$filters{'end'})) 
                    767:                                                              { $include=0; }
                    768:         if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
                    769:         if (($filters{'action'} eq 'check') && ($log!~/^Check/)) 
                    770:                                                              { $include=0; }
                    771:         if ($include) {
                    772: 	   push(@results,$timestamp.':'.$log);
                    773:         }
                    774:     }
                    775:     close IN;
                    776:     return join('&',sort(@results));
                    777: }
                    778: 
                    779: ########################################################
                    780: ########################################################
                    781: 
                    782: =pod
                    783: 
                    784: =item Functions required for forking
                    785: 
                    786: =over 4
                    787: 
                    788: =item REAPER
                    789: 
                    790: REAPER takes care of dead children.
                    791: 
                    792: =item HUNTSMAN
                    793: 
                    794: Signal handler for SIGINT.
                    795: 
                    796: =item HUPSMAN
                    797: 
                    798: Signal handler for SIGHUP
                    799: 
                    800: =item DISCONNECT
                    801: 
                    802: Disconnects from database.
                    803: 
                    804: =back
                    805: 
                    806: =cut
                    807: 
                    808: ########################################################
                    809: ########################################################
                    810: sub REAPER {                   # takes care of dead children
                    811:     $SIG{CHLD} = \&REAPER;
                    812:     my $pid = wait;
                    813:     $children --;
                    814:     &logthis("Child $pid died");
                    815:     delete $children{$pid};
                    816: }
                    817: 
                    818: sub HUNTSMAN {                      # signal handler for SIGINT
                    819:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                    820:     kill 'INT' => keys %children;
                    821:     my $execdir=$perlvar{'lonDaemons'};
                    822:     unlink("$execdir/logs/lonsql.pid");
                    823:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
                    824:     $unixsock = "mysqlsock";
                    825:     my $port="$perlvar{'lonSockDir'}/$unixsock";
                    826:     unlink($port);
                    827:     exit;                           # clean up with dignity
                    828: }
                    829: 
                    830: sub HUPSMAN {                      # signal handler for SIGHUP
                    831:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
                    832:     kill 'INT' => keys %children;
                    833:     close($server);                # free up socket
                    834:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
                    835:     my $execdir=$perlvar{'lonDaemons'};
                    836:     $unixsock = "mysqlsock";
                    837:     my $port="$perlvar{'lonSockDir'}/$unixsock";
                    838:     unlink($port);
                    839:     exec("$execdir/lonsql");         # here we go again
                    840: }
                    841: 
1.2     ! www       842: #
        !           843: # Takes SQL query
        !           844: # sends it to NSDL
        !           845: # has to return array reference
        !           846: #
1.1       www       847: 
1.2     ! www       848: sub nsdl_query {
        !           849:     my $query=shift;
        !           850: } 
1.1       www       851: 
                    852: =pod
                    853: 
                    854: =back
                    855: 
                    856: =cut

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>