Annotation of loncom/lonsql, revision 1.62
1.1 harris41 1: #!/usr/bin/perl
1.39 harris41 2:
3: # The LearningOnline Network
1.40 harris41 4: # lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
1.39 harris41 5: #
1.62 ! raeburn 6: # $Id: lonsql,v 1.61 2004/05/20 14:15:29 matthew Exp $
1.41 harris41 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: #
1.51 matthew 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:
1.56 bowersj2 42: =head1 OVERVIEW
1.51 matthew 43:
1.56 bowersj2 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.
1.51 matthew 95:
96: =head1 Internals
97:
98: =over 4
99:
100: =cut
101:
102: use strict;
1.36 www 103:
1.42 harris41 104: use lib '/home/httpd/lib/perl/';
105: use LONCAPA::Configuration;
1.58 matthew 106: use LONCAPA::lonmetadata();
1.42 harris41 107:
1.2 harris41 108: use IO::Socket;
109: use Symbol;
1.1 harris41 110: use POSIX;
111: use IO::Select;
112: use IO::File;
113: use Socket;
114: use Fcntl;
115: use Tie::RefHash;
116: use DBI;
1.51 matthew 117: use File::Find;
1.62 ! raeburn 118: use localenroll;
1.51 matthew 119:
120: ########################################################
121: ########################################################
122:
123: =pod
124:
125: =item Global Variables
126:
127: =over 4
128:
129: =item dbh
130:
131: =back
132:
133: =cut
134:
135: ########################################################
136: ########################################################
137: my $dbh;
138:
139: ########################################################
140: ########################################################
141:
142: =pod
143:
144: =item Variables required for forking
1.1 harris41 145:
1.51 matthew 146: =over 4
147:
148: =item $MAX_CLIENTS_PER_CHILD
149:
150: The number of clients each child should process.
151:
152: =item %children
153:
154: The keys to %children are the current child process IDs
155:
156: =item $children
157:
158: The current number of children
159:
160: =back
161:
162: =cut
1.9 harris41 163:
1.51 matthew 164: ########################################################
165: ########################################################
166: my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
167: my %children = (); # keys are current child process IDs
168: my $children = 0; # current number of children
169:
170: ###################################################################
171: ###################################################################
172:
173: =pod
174:
175: =item Main body of code.
176:
177: =over 4
1.45 www 178:
1.51 matthew 179: =item Read data from loncapa_apache.conf and loncapa.conf.
180:
181: =item Ensure we can access the database.
182:
183: =item Determine if there are other instances of lonsql running.
184:
185: =item Read the hosts file.
186:
187: =item Create a socket for lonsql.
188:
189: =item Fork once and dissociate from parent.
190:
191: =item Write PID to disk.
192:
193: =item Prefork children and maintain the population of children.
194:
195: =back
196:
197: =cut
198:
199: ###################################################################
200: ###################################################################
201: my $childmaxattempts=10;
202: my $run =0; # running counter to generate the query-id
203: #
204: # Read loncapa_apache.conf and loncapa.conf
205: #
1.53 harris41 206: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.51 matthew 207: my %perlvar=%{$perlvarref};
208: #
209: # Make sure that database can be accessed
210: #
211: my $dbh;
212: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
213: $perlvar{'lonSqlAccess'},
214: { RaiseError =>0,PrintError=>0})) {
215: print "Cannot connect to database!\n";
216: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
217: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
218: system("echo 'Cannot connect to MySQL database!' |".
219: " mailto $emailto -s '$subj' > /dev/null");
1.57 www 220:
221: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
222: print SMP 'time='.time.'&mysql=defunct'."\n";
223: close(SMP);
224:
1.51 matthew 225: exit 1;
226: } else {
227: $dbh->disconnect;
228: }
1.52 matthew 229:
1.51 matthew 230: #
231: # Check if other instance running
232: #
233: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
234: if (-e $pidfile) {
235: my $lfh=IO::File->new("$pidfile");
236: my $pide=<$lfh>;
237: chomp($pide);
238: if (kill 0 => $pide) { die "already running"; }
239: }
1.52 matthew 240:
1.49 www 241: #
1.51 matthew 242: # Read hosts file
1.49 www 243: #
1.51 matthew 244: my %hostip;
245: my $thisserver;
246: my $PREFORK=4; # number of children to maintain, at least four spare
247: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
248: while (my $configline=<CONFIG>) {
249: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
250: chomp($ip);
251: $hostip{$ip}=$id;
252: $thisserver=$name if ($id eq $perlvar{'lonHostID'});
253: $PREFORK++;
1.45 www 254: }
1.51 matthew 255: close(CONFIG);
256: #
257: $PREFORK=int($PREFORK/4);
1.52 matthew 258:
1.51 matthew 259: #
260: # Create a socket to talk to lond
261: #
262: my $unixsock = "mysqlsock";
263: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
264: my $server;
265: unlink ($localfile);
266: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
267: Type => SOCK_STREAM,
268: Listen => 10)) {
269: print "in socket error:$@\n";
1.45 www 270: }
1.52 matthew 271:
1.51 matthew 272: #
273: # Fork once and dissociate
1.52 matthew 274: #
1.51 matthew 275: my $fpid=fork;
1.1 harris41 276: exit if $fpid;
277: die "Couldn't fork: $!" unless defined ($fpid);
278: POSIX::setsid() or die "Can't start new session: $!";
1.52 matthew 279:
1.51 matthew 280: #
281: # Write our PID on disk
282: my $execdir=$perlvar{'lonDaemons'};
1.1 harris41 283: open (PIDSAVE,">$execdir/logs/lonsql.pid");
284: print PIDSAVE "$$\n";
285: close(PIDSAVE);
1.59 albertel 286: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.52 matthew 287:
1.51 matthew 288: #
289: # Ignore signals generated during initial startup
1.1 harris41 290: $SIG{HUP}=$SIG{USR1}='IGNORE';
1.51 matthew 291: # Now we are on our own
292: # Fork off our children.
1.2 harris41 293: for (1 .. $PREFORK) {
294: make_new_child();
1.1 harris41 295: }
1.52 matthew 296:
1.51 matthew 297: #
1.2 harris41 298: # Install signal handlers.
1.1 harris41 299: $SIG{CHLD} = \&REAPER;
300: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
301: $SIG{HUP} = \&HUPSMAN;
1.52 matthew 302:
1.51 matthew 303: #
1.1 harris41 304: # And maintain the population.
305: while (1) {
306: sleep; # wait for a signal (i.e., child's death)
1.51 matthew 307: for (my $i = $children; $i < $PREFORK; $i++) {
1.2 harris41 308: make_new_child(); # top up the child pool
1.1 harris41 309: }
310: }
311:
1.51 matthew 312: ########################################################
313: ########################################################
314:
315: =pod
316:
317: =item &make_new_child
318:
319: Inputs: None
320:
321: Returns: None
322:
323: =cut
1.2 harris41 324:
1.51 matthew 325: ########################################################
326: ########################################################
1.1 harris41 327: sub make_new_child {
328: my $pid;
329: my $sigset;
1.51 matthew 330: #
1.1 harris41 331: # block signal for fork
332: $sigset = POSIX::SigSet->new(SIGINT);
333: sigprocmask(SIG_BLOCK, $sigset)
334: or die "Can't block SIGINT for fork: $!\n";
1.51 matthew 335: #
1.2 harris41 336: die "fork: $!" unless defined ($pid = fork);
1.51 matthew 337: #
1.1 harris41 338: if ($pid) {
339: # Parent records the child's birth and returns.
340: sigprocmask(SIG_UNBLOCK, $sigset)
341: or die "Can't unblock SIGINT for fork: $!\n";
342: $children{$pid} = 1;
343: $children++;
344: return;
345: } else {
1.2 harris41 346: # Child can *not* return from this subroutine.
1.1 harris41 347: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
348: # unblock signals
349: sigprocmask(SIG_UNBLOCK, $sigset)
350: or die "Can't unblock SIGINT for fork: $!\n";
1.2 harris41 351: #open database handle
352: # making dbh global to avoid garbage collector
1.51 matthew 353: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
354: $perlvar{'lonSqlAccess'},
355: { RaiseError =>0,PrintError=>0})) {
356: sleep(10+int(rand(20)));
1.59 albertel 357: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
1.51 matthew 358: ": $@</font>");
359: # "($st secs): $@</font>");
360: print "database handle error\n";
361: exit;
362: }
363: # make sure that a database disconnection occurs with
364: # ending kill signals
1.2 harris41 365: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
1.1 harris41 366: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
1.51 matthew 367: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
368: my $client = $server->accept() or last;
1.2 harris41 369: # do something with the connection
1.1 harris41 370: $run = $run+1;
1.2 harris41 371: my $userinput = <$client>;
372: chomp($userinput);
1.51 matthew 373: #
1.45 www 374: my ($conserver,$query,
375: $arg1,$arg2,$arg3)=split(/&/,$userinput);
376: my $query=unescape($query);
1.51 matthew 377: #
1.2 harris41 378: #send query id which is pid_unixdatetime_runningcounter
1.51 matthew 379: my $queryid = $thisserver;
1.2 harris41 380: $queryid .="_".($$)."_";
381: $queryid .= time."_";
382: $queryid .= $run;
383: print $client "$queryid\n";
1.51 matthew 384: #
1.61 matthew 385: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
1.25 harris41 386: sleep 1;
1.51 matthew 387: #
1.45 www 388: my $result='';
1.51 matthew 389: #
390: # At this point, query is received, query-ID assigned and sent
391: # back, $query eq 'logquery' will mean that this is a query
392: # against log-files
393: if (($query eq 'userlog') || ($query eq 'courselog')) {
394: # beginning of log query
395: my $udom = &unescape($arg1);
396: my $uname = &unescape($arg2);
397: my $command = &unescape($arg3);
398: my $path = &propath($udom,$uname);
399: if (-e "$path/activity.log") {
400: if ($query eq 'userlog') {
401: $result=&userlog($path,$command);
402: } else {
403: $result=&courselog($path,$command);
404: }
405: } else {
406: &logthis('Unable to do log query: '.$uname.'@'.$udom);
407: $result='no_such_file';
408: }
409: # end of log query
1.62 ! raeburn 410: } elsif ($query eq 'fetchenrollment') {
! 411: # retrieve institutional class lists
! 412: my $dom = &unescape($arg1);
! 413: my %affiliates = ();
! 414: my %replies = ();
! 415: my $locresult = '';
! 416: my $querystr = &unescape($arg3);
! 417: foreach (split/%%/,$querystr) {
! 418: if (/^(\w+)=([^=]+)$/) {
! 419: @{$affiliates{$1}} = split/,/,$2;
! 420: }
! 421: }
! 422: $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
! 423: $result = &escape($locresult.':');
! 424: if ($locresult) {
! 425: $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
! 426: }
1.51 matthew 427: } else {
428: # Do an sql query
429: $result = &do_sql_query($query,$arg1,$arg2);
430: }
1.50 matthew 431: # result does not need to be escaped because it has already been
432: # escaped.
433: #$result=&escape($result);
1.17 harris41 434: &reply("queryreply:$queryid:$result",$conserver);
1.1 harris41 435: }
436: # tidy up gracefully and finish
1.51 matthew 437: #
438: # close the database handle
1.2 harris41 439: $dbh->disconnect
1.59 albertel 440: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
1.51 matthew 441: " from database $DBI::errstr : $@</font>");
1.1 harris41 442: # this exit is VERY important, otherwise the child will become
443: # a producer of more and more children, forking yourself into
444: # process death.
445: exit;
446: }
1.2 harris41 447: }
1.1 harris41 448:
1.51 matthew 449: ########################################################
450: ########################################################
451:
452: =pod
453:
454: =item &do_sql_query
455:
456: Runs an sql metadata table query.
457:
458: Inputs: $query, $custom, $customshow
459:
460: Returns: A string containing escaped results.
461:
462: =cut
463:
464: ########################################################
465: ########################################################
466: {
467: my @metalist;
468:
469: sub process_file {
470: if ( -e $_ && # file exists
471: -f $_ && # and is a normal file
472: /\.meta$/ && # ends in meta
473: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
474: ) {
475: push(@metalist,$File::Find::name);
476: }
477: }
478:
479: sub do_sql_query {
480: my ($query,$custom,$customshow) = @_;
481: $custom = &unescape($custom);
482: $customshow = &unescape($customshow);
483: #
484: @metalist = ();
485: #
486: my $result = '';
487: my @results = ();
488: my @files;
489: my $subsetflag=0;
490: #
491: if ($query) {
492: #prepare and execute the query
493: my $sth = $dbh->prepare($query);
494: unless ($sth->execute()) {
1.59 albertel 495: &logthis('<font color="blue">'.
1.58 matthew 496: 'WARNING: Could not retrieve from database:'.
497: $sth->errstr().'</font>');
1.51 matthew 498: } else {
499: my $aref=$sth->fetchall_arrayref;
500: foreach my $row (@$aref) {
501: push @files,@{$row}[3] if ($custom or $customshow);
502: my @b=map { &escape($_); } @$row;
503: push @results,join(",", @b);
504: # Build up the @files array with the LON-CAPA urls
505: # of the resources.
506: }
507: }
508: }
509: # do custom metadata searching here and build into result
510: return join("&",@results) if (! ($custom or $customshow));
511: # Only get here if there is a custom query or custom show request
512: &logthis("Doing custom query for $custom");
513: if ($query) {
514: @metalist=map {
515: $perlvar{'lonDocRoot'}.$_.'.meta';
516: } @files;
517: } else {
518: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
519: @metalist=();
520: opendir(RESOURCES,$dir);
521: my @homeusers=grep {
522: &ishome($dir.'/'.$_);
523: } grep {!/^\.\.?$/} readdir(RESOURCES);
524: closedir RESOURCES;
525: # Define the
526: foreach my $user (@homeusers) {
527: find (\&process_file,$dir.'/'.$user);
528: }
529: }
530: # if file is indicated in sql database and
531: # not part of sql-relevant query, do not pattern match.
532: #
533: # if file is not in sql database, output error.
534: #
535: # if file is indicated in sql database and is
536: # part of query result list, then do the pattern match.
537: my $customresult='';
538: my @results;
539: foreach my $metafile (@metalist) {
540: my $fh=IO::File->new($metafile);
541: my @lines=<$fh>;
542: my $stuff=join('',@lines);
543: if ($stuff=~/$custom/s) {
544: foreach my $f ('abstract','author','copyright',
545: 'creationdate','keywords','language',
546: 'lastrevisiondate','mime','notes',
547: 'owner','subject','title') {
548: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
549: }
550: my $mfile=$metafile;
551: my $docroot=$perlvar{'lonDocRoot'};
552: $mfile=~s/^$docroot//;
553: $mfile=~s/\.meta$//;
554: unless ($query) {
555: my $q2="SELECT * FROM metadata WHERE url ".
556: " LIKE BINARY '?'";
557: my $sth = $dbh->prepare($q2);
558: $sth->execute($mfile);
559: my $aref=$sth->fetchall_arrayref;
560: foreach my $a (@$aref) {
561: my @b=map { &escape($_)} @$a;
562: push @results,join(",", @b);
563: }
564: }
565: # &logthis("found: $stuff");
566: $customresult.='&custom='.&escape($mfile).','.
567: escape($stuff);
568: }
569: }
570: $result=join("&",@results) unless $query;
571: $result.=$customresult;
572: #
573: return $result;
574: } # End of &do_sql_query
575:
576: } # End of scoping curly braces for &process_file and &do_sql_query
577: ########################################################
578: ########################################################
579:
580: =pod
581:
582: =item &logthis
583:
584: Inputs: $message, the message to log
585:
586: Returns: nothing
587:
588: Writes $message to the logfile.
589:
590: =cut
591:
592: ########################################################
593: ########################################################
594: sub logthis {
595: my $message=shift;
596: my $execdir=$perlvar{'lonDaemons'};
1.52 matthew 597: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
1.51 matthew 598: my $now=time;
599: my $local=localtime($now);
600: print $fh "$local ($$): $message\n";
1.2 harris41 601: }
1.1 harris41 602:
1.2 harris41 603: # -------------------------------------------------- Non-critical communication
1.1 harris41 604:
1.51 matthew 605: ########################################################
606: ########################################################
607:
608: =pod
609:
610: =item &subreply
611:
612: Sends a command to a server. Called only by &reply.
613:
614: Inputs: $cmd,$server
615:
616: Returns: The results of the message or 'con_lost' on error.
617:
618: =cut
619:
620: ########################################################
621: ########################################################
1.2 harris41 622: sub subreply {
623: my ($cmd,$server)=@_;
624: my $peerfile="$perlvar{'lonSockDir'}/$server";
625: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
626: Type => SOCK_STREAM,
627: Timeout => 10)
628: or return "con_lost";
629: print $sclient "$cmd\n";
630: my $answer=<$sclient>;
631: chomp($answer);
1.51 matthew 632: $answer="con_lost" if (!$answer);
1.2 harris41 633: return $answer;
634: }
1.1 harris41 635:
1.51 matthew 636: ########################################################
637: ########################################################
638:
639: =pod
640:
641: =item &reply
642:
643: Sends a command to a server.
644:
645: Inputs: $cmd,$server
646:
647: Returns: The results of the message or 'con_lost' on error.
648:
649: =cut
650:
651: ########################################################
652: ########################################################
1.2 harris41 653: sub reply {
654: my ($cmd,$server)=@_;
655: my $answer;
656: if ($server ne $perlvar{'lonHostID'}) {
657: $answer=subreply($cmd,$server);
658: if ($answer eq 'con_lost') {
659: $answer=subreply("ping",$server);
660: $answer=subreply($cmd,$server);
661: }
662: } else {
663: $answer='self_reply';
1.33 harris41 664: $answer=subreply($cmd,$server);
1.2 harris41 665: }
666: return $answer;
667: }
1.1 harris41 668:
1.51 matthew 669: ########################################################
670: ########################################################
671:
672: =pod
673:
674: =item &escape
675:
676: Escape special characters in a string.
1.3 harris41 677:
1.51 matthew 678: Inputs: string to escape
679:
680: Returns: The input string with special characters escaped.
681:
682: =cut
683:
684: ########################################################
685: ########################################################
1.3 harris41 686: sub escape {
687: my $str=shift;
688: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
689: return $str;
690: }
691:
1.51 matthew 692: ########################################################
693: ########################################################
694:
695: =pod
696:
697: =item &unescape
698:
699: Unescape special characters in a string.
1.3 harris41 700:
1.51 matthew 701: Inputs: string to unescape
702:
703: Returns: The input string with special characters unescaped.
704:
705: =cut
706:
707: ########################################################
708: ########################################################
1.3 harris41 709: sub unescape {
710: my $str=shift;
711: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
712: return $str;
713: }
1.34 harris41 714:
1.51 matthew 715: ########################################################
716: ########################################################
717:
718: =pod
719:
720: =item &ishome
721:
722: Determine if the current machine is the home server for a user.
723: The determination is made by checking the filesystem for the users information.
724:
725: Inputs: $author
726:
727: Returns: 0 - this is not the authors home server, 1 - this is.
728:
729: =cut
730:
731: ########################################################
732: ########################################################
1.34 harris41 733: sub ishome {
734: my $author=shift;
735: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
736: my ($udom,$uname)=split(/\//,$author);
737: my $proname=propath($udom,$uname);
738: if (-e $proname) {
739: return 1;
740: } else {
741: return 0;
742: }
743: }
744:
1.51 matthew 745: ########################################################
746: ########################################################
747:
748: =pod
749:
750: =item &propath
751:
752: Inputs: user name, user domain
753:
754: Returns: The full path to the users directory.
755:
756: =cut
757:
758: ########################################################
759: ########################################################
1.34 harris41 760: sub propath {
761: my ($udom,$uname)=@_;
762: $udom=~s/\W//g;
763: $uname=~s/\W//g;
764: my $subdir=$uname.'__';
765: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
766: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
767: return $proname;
768: }
1.40 harris41 769:
1.51 matthew 770: ########################################################
771: ########################################################
772:
773: =pod
774:
775: =item &courselog
776:
777: Inputs: $path, $command
778:
779: Returns: unescaped string of values.
780:
781: =cut
782:
783: ########################################################
784: ########################################################
785: sub courselog {
786: my ($path,$command)=@_;
787: my %filters=();
788: foreach (split(/\:/,&unescape($command))) {
789: my ($name,$value)=split(/\=/,$_);
790: $filters{$name}=$value;
791: }
792: my @results=();
793: open(IN,$path.'/activity.log') or return ('file_error');
794: while (my $line=<IN>) {
795: chomp($line);
796: my ($timestamp,$host,$log)=split(/\:/,$line);
797: #
798: # $log has the actual log entries; currently still escaped, and
799: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
800: # then additionally
801: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
802: # or
803: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
804: #
805: # get delimiter between timestamped entries to be &&&
806: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
807: # now go over all log entries
808: foreach (split(/\&\&\&/,&unescape($log))) {
809: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
810: my $values=&unescape(join(':',@values));
811: $values=~s/\&/\:/g;
812: $res=&unescape($res);
813: my $include=1;
814: if (($filters{'username'}) && ($uname ne $filters{'username'}))
815: { $include=0; }
816: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
817: { $include=0; }
818: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
819: { $include=0; }
820: if (($filters{'start'}) && ($time<$filters{'start'}))
821: { $include=0; }
822: if (($filters{'end'}) && ($time>$filters{'end'}))
823: { $include=0; }
824: if (($filters{'action'} eq 'view') && ($action))
825: { $include=0; }
826: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
827: { $include=0; }
828: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
829: { $include=0; }
830: if ($include) {
831: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
832: $uname.':'.$udom.':'.
833: $action.':'.$values);
834: }
835: }
836: }
837: close IN;
838: return join('&',sort(@results));
839: }
840:
841: ########################################################
842: ########################################################
843:
844: =pod
845:
846: =item &userlog
847:
848: Inputs: $path, $command
849:
850: Returns: unescaped string of values.
1.40 harris41 851:
1.51 matthew 852: =cut
1.40 harris41 853:
1.51 matthew 854: ########################################################
855: ########################################################
856: sub userlog {
857: my ($path,$command)=@_;
858: my %filters=();
859: foreach (split(/\:/,&unescape($command))) {
860: my ($name,$value)=split(/\=/,$_);
861: $filters{$name}=$value;
862: }
863: my @results=();
864: open(IN,$path.'/activity.log') or return ('file_error');
865: while (my $line=<IN>) {
866: chomp($line);
867: my ($timestamp,$host,$log)=split(/\:/,$line);
868: $log=&unescape($log);
869: my $include=1;
870: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
871: { $include=0; }
872: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
873: { $include=0; }
874: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
875: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
876: { $include=0; }
877: if ($include) {
878: push(@results,$timestamp.':'.$log);
879: }
880: }
881: close IN;
882: return join('&',sort(@results));
1.52 matthew 883: }
884:
885: ########################################################
886: ########################################################
887:
888: =pod
889:
890: =item Functions required for forking
891:
892: =over 4
893:
894: =item REAPER
895:
896: REAPER takes care of dead children.
897:
898: =item HUNTSMAN
899:
900: Signal handler for SIGINT.
901:
902: =item HUPSMAN
903:
904: Signal handler for SIGHUP
905:
906: =item DISCONNECT
907:
908: Disconnects from database.
909:
910: =back
911:
912: =cut
913:
914: ########################################################
915: ########################################################
916: sub REAPER { # takes care of dead children
917: $SIG{CHLD} = \&REAPER;
918: my $pid = wait;
919: $children --;
920: &logthis("Child $pid died");
921: delete $children{$pid};
922: }
923:
924: sub HUNTSMAN { # signal handler for SIGINT
925: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
926: kill 'INT' => keys %children;
927: my $execdir=$perlvar{'lonDaemons'};
928: unlink("$execdir/logs/lonsql.pid");
1.59 albertel 929: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.52 matthew 930: $unixsock = "mysqlsock";
931: my $port="$perlvar{'lonSockDir'}/$unixsock";
932: unlink($port);
933: exit; # clean up with dignity
934: }
935:
936: sub HUPSMAN { # signal handler for SIGHUP
937: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
938: kill 'INT' => keys %children;
939: close($server); # free up socket
1.59 albertel 940: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.52 matthew 941: my $execdir=$perlvar{'lonDaemons'};
942: $unixsock = "mysqlsock";
943: my $port="$perlvar{'lonSockDir'}/$unixsock";
944: unlink($port);
945: exec("$execdir/lonsql"); # here we go again
946: }
947:
948: sub DISCONNECT {
949: $dbh->disconnect or
1.59 albertel 950: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
1.52 matthew 951: " $DBI::errstr : $@</font>");
952: exit;
1.51 matthew 953: }
1.40 harris41 954:
955:
1.51 matthew 956: =pod
1.40 harris41 957:
1.51 matthew 958: =back
1.40 harris41 959:
960: =cut
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