File:
[LON-CAPA] /
loncom /
lonsql
Revision
1.62:
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Tue Jun 8 22:09:44 2004 UTC (20 years, 3 months ago) by
raeburn
Branches:
MAIN
CVS tags:
version_1_1_99_5,
version_1_1_99_4,
version_1_1_99_3,
version_1_1_99_2,
version_1_1_99_1,
HEAD
Changes to support autoenroll calls from a remote server.
lond on the homeserver for the course(s) handles requests from the remote
server for institutional data (e.g., classlists, valid institutional courseIDs,
institutional section numbers for a course code, validation of course owners), by
calling the appropriate functions in the homeserver's localenroll.pm
All replies are made directly with the exception of fetch_enrollment_query, which
is shipped over to lonsql, in case retrieval of institutional classlists is a
protracted process.
lonsql on the homeserver for the course(s) calls localenroll::fetch_enrollment()
and writes XML files of enrollment data to /home/httpd/perl/tmp
Transfer of classlist data occurs later following an autoretrieve call from the
remote server. It is planned to generalize this function and add encryption to the transfer back to the client.
Autoenroll.pl called by cron on a library server, now only carries out updates for
courses in its domain, for which the library server is the course's homeserver. If a domain has multiple library servers Autoenroll.pl will need to be run on each library server.
1: #!/usr/bin/perl
2:
3: # The LearningOnline Network
4: # lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
5: #
6: # $Id: lonsql,v 1.62 2004/06/08 22:09:44 raeburn Exp $
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;
116: use DBI;
117: use File::Find;
118: use localenroll;
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
145:
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
163:
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
178:
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: #
206: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
207: my %perlvar=%{$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");
220:
221: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
222: print SMP 'time='.time.'&mysql=defunct'."\n";
223: close(SMP);
224:
225: exit 1;
226: } else {
227: $dbh->disconnect;
228: }
229:
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: }
240:
241: #
242: # Read hosts file
243: #
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++;
254: }
255: close(CONFIG);
256: #
257: $PREFORK=int($PREFORK/4);
258:
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";
270: }
271:
272: #
273: # Fork once and dissociate
274: #
275: my $fpid=fork;
276: exit if $fpid;
277: die "Couldn't fork: $!" unless defined ($fpid);
278: POSIX::setsid() or die "Can't start new session: $!";
279:
280: #
281: # Write our PID on disk
282: my $execdir=$perlvar{'lonDaemons'};
283: open (PIDSAVE,">$execdir/logs/lonsql.pid");
284: print PIDSAVE "$$\n";
285: close(PIDSAVE);
286: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
287:
288: #
289: # Ignore signals generated during initial startup
290: $SIG{HUP}=$SIG{USR1}='IGNORE';
291: # Now we are on our own
292: # Fork off our children.
293: for (1 .. $PREFORK) {
294: make_new_child();
295: }
296:
297: #
298: # Install signal handlers.
299: $SIG{CHLD} = \&REAPER;
300: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
301: $SIG{HUP} = \&HUPSMAN;
302:
303: #
304: # And maintain the population.
305: while (1) {
306: sleep; # wait for a signal (i.e., child's death)
307: for (my $i = $children; $i < $PREFORK; $i++) {
308: make_new_child(); # top up the child pool
309: }
310: }
311:
312: ########################################################
313: ########################################################
314:
315: =pod
316:
317: =item &make_new_child
318:
319: Inputs: None
320:
321: Returns: None
322:
323: =cut
324:
325: ########################################################
326: ########################################################
327: sub make_new_child {
328: my $pid;
329: my $sigset;
330: #
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";
335: #
336: die "fork: $!" unless defined ($pid = fork);
337: #
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 {
346: # Child can *not* return from this subroutine.
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";
351: #open database handle
352: # making dbh global to avoid garbage collector
353: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
354: $perlvar{'lonSqlAccess'},
355: { RaiseError =>0,PrintError=>0})) {
356: sleep(10+int(rand(20)));
357: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
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
365: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
366: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
367: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
368: my $client = $server->accept() or last;
369: # do something with the connection
370: $run = $run+1;
371: my $userinput = <$client>;
372: chomp($userinput);
373: #
374: my ($conserver,$query,
375: $arg1,$arg2,$arg3)=split(/&/,$userinput);
376: my $query=unescape($query);
377: #
378: #send query id which is pid_unixdatetime_runningcounter
379: my $queryid = $thisserver;
380: $queryid .="_".($$)."_";
381: $queryid .= time."_";
382: $queryid .= $run;
383: print $client "$queryid\n";
384: #
385: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
386: sleep 1;
387: #
388: my $result='';
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: $result='no_such_file';
408: }
409: # end of log query
410: } elsif ($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: }
427: } else {
428: # Do an sql query
429: $result = &do_sql_query($query,$arg1,$arg2);
430: }
431: # result does not need to be escaped because it has already been
432: # escaped.
433: #$result=&escape($result);
434: &reply("queryreply:$queryid:$result",$conserver);
435: }
436: # tidy up gracefully and finish
437: #
438: # close the database handle
439: $dbh->disconnect
440: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
441: " from database $DBI::errstr : $@</font>");
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: }
447: }
448:
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()) {
495: &logthis('<font color="blue">'.
496: 'WARNING: Could not retrieve from database:'.
497: $sth->errstr().'</font>');
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'};
597: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
598: my $now=time;
599: my $local=localtime($now);
600: print $fh "$local ($$): $message\n";
601: }
602:
603: # -------------------------------------------------- Non-critical communication
604:
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: ########################################################
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);
632: $answer="con_lost" if (!$answer);
633: return $answer;
634: }
635:
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: ########################################################
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';
664: $answer=subreply($cmd,$server);
665: }
666: return $answer;
667: }
668:
669: ########################################################
670: ########################################################
671:
672: =pod
673:
674: =item &escape
675:
676: Escape special characters in a string.
677:
678: Inputs: string to escape
679:
680: Returns: The input string with special characters escaped.
681:
682: =cut
683:
684: ########################################################
685: ########################################################
686: sub escape {
687: my $str=shift;
688: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
689: return $str;
690: }
691:
692: ########################################################
693: ########################################################
694:
695: =pod
696:
697: =item &unescape
698:
699: Unescape special characters in a string.
700:
701: Inputs: string to unescape
702:
703: Returns: The input string with special characters unescaped.
704:
705: =cut
706:
707: ########################################################
708: ########################################################
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: }
714:
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: ########################################################
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 $proname) {
739: return 1;
740: } else {
741: return 0;
742: }
743: }
744:
745: ########################################################
746: ########################################################
747:
748: =pod
749:
750: =item &propath
751:
752: Inputs: user name, user domain
753:
754: Returns: The full path to the users directory.
755:
756: =cut
757:
758: ########################################################
759: ########################################################
760: sub propath {
761: my ($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: }
769:
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, $command
849:
850: Returns: unescaped string of values.
851:
852: =cut
853:
854: ########################################################
855: ########################################################
856: sub userlog {
857: my ($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));
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");
929: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
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
940: &logthis("<font color='red'>CRITICAL: Restarting</font>");
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
950: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
951: " $DBI::errstr : $@</font>");
952: exit;
953: }
954:
955:
956: =pod
957:
958: =back
959:
960: =cut
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