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Simple one-line status for cluster-wide automated reporting
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 1.57 2003/07/30 16:49:27 www 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: The SQL database in LON-CAPA is used for catalog searches against
45: resource metadata only. The authoritative version of the resource
46: metadata is an XML-file on the normal file system (same file name as
47: resource plus ".meta"). The SQL-database is a cache of these files,
48: and can be reconstructed from the XML files at any time.
49:
50: The current database is implemented assuming a non-adjustable
51: architecture involving these data fields (specific to each version of
52: a resource).
53:
54: =over 4
55:
56: =item * title
57:
58: =item * author
59:
60: =item * subject
61:
62: =item * notes
63:
64: =item * abstract
65:
66: =item * mime
67:
68: =item * language
69:
70: =item * creationdate
71:
72: =item * lastrevisiondate
73:
74: =item * owner
75:
76: =item * copyright
77:
78: =back
79:
80: =head2 Purpose within LON-CAPA
81:
82: LON-CAPA is meant to distribute A LOT of educational content to A LOT
83: of people. It is ineffective to directly rely on contents within the
84: ext2 filesystem to be speedily scanned for on-the-fly searches of
85: content descriptions. (Simply put, it takes a cumbersome amount of
86: time to open, read, analyze, and close thousands of files.)
87:
88: The solution is to index various data fields that are descriptive of
89: the educational resources on a LON-CAPA server machine in a
90: database. Descriptive data fields are referred to as "metadata". The
91: question then arises as to how this metadata is handled in terms of
92: the rest of the LON-CAPA network without burdening client and daemon
93: processes.
94:
95: The obvious solution, using lonc to send a query to a lond process,
96: doesn't work so well in general as you can see in the following
97: example:
98:
99: lonc= loncapa client process A-lonc= a lonc process on Server A
100: lond= loncapa daemon process
101:
102: database command
103: A-lonc --------TCP/IP----------------> B-lond
104:
105: The problem emerges that A-lonc and B-lond are kept waiting for the
106: MySQL server to "do its stuff", or in other words, perform the
107: conceivably sophisticated, data-intensive, time-sucking database
108: transaction. By tying up a lonc and lond process, this significantly
109: cripples the capabilities of LON-CAPA servers.
110:
111: The solution is to offload the work onto another process, and use
112: lonc and lond just for requests and notifications of completed
113: processing:
114:
115: database command
116:
117: A-lonc ---------TCP/IP-----------------> B-lond =====> B-lonsql
118: <---------------------------------/ |
119: "ok, I'll get back to you..." |
120: |
121: /
122: A-lond <------------------------------- B-lonc <======
123: "Guess what? I have the result!"
124:
125: Of course, depending on success or failure, the messages may vary, but
126: the principle remains the same where a separate pool of children
127: processes (lonsql's) handle the MySQL database manipulations.
128:
129: Thus, lonc and lond spend effectively no time waiting on results from
130: the database.
131:
132: =head1 Internals
133:
134: =over 4
135:
136: =cut
137:
138: use strict;
139:
140: use lib '/home/httpd/lib/perl/';
141: use LONCAPA::Configuration;
142:
143: use IO::Socket;
144: use Symbol;
145: use POSIX;
146: use IO::Select;
147: use IO::File;
148: use Socket;
149: use Fcntl;
150: use Tie::RefHash;
151: use DBI;
152: use File::Find;
153:
154: ########################################################
155: ########################################################
156:
157: =pod
158:
159: =item Global Variables
160:
161: =over 4
162:
163: =item dbh
164:
165: =back
166:
167: =cut
168:
169: ########################################################
170: ########################################################
171: my $dbh;
172:
173: ########################################################
174: ########################################################
175:
176: =pod
177:
178: =item Variables required for forking
179:
180: =over 4
181:
182: =item $MAX_CLIENTS_PER_CHILD
183:
184: The number of clients each child should process.
185:
186: =item %children
187:
188: The keys to %children are the current child process IDs
189:
190: =item $children
191:
192: The current number of children
193:
194: =back
195:
196: =cut
197:
198: ########################################################
199: ########################################################
200: my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
201: my %children = (); # keys are current child process IDs
202: my $children = 0; # current number of children
203:
204: ###################################################################
205: ###################################################################
206:
207: =pod
208:
209: =item Main body of code.
210:
211: =over 4
212:
213: =item Read data from loncapa_apache.conf and loncapa.conf.
214:
215: =item Ensure we can access the database.
216:
217: =item Determine if there are other instances of lonsql running.
218:
219: =item Read the hosts file.
220:
221: =item Create a socket for lonsql.
222:
223: =item Fork once and dissociate from parent.
224:
225: =item Write PID to disk.
226:
227: =item Prefork children and maintain the population of children.
228:
229: =back
230:
231: =cut
232:
233: ###################################################################
234: ###################################################################
235: my $childmaxattempts=10;
236: my $run =0; # running counter to generate the query-id
237: #
238: # Read loncapa_apache.conf and loncapa.conf
239: #
240: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
241: my %perlvar=%{$perlvarref};
242: #
243: # Make sure that database can be accessed
244: #
245: my $dbh;
246: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
247: $perlvar{'lonSqlAccess'},
248: { RaiseError =>0,PrintError=>0})) {
249: print "Cannot connect to database!\n";
250: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
251: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
252: system("echo 'Cannot connect to MySQL database!' |".
253: " mailto $emailto -s '$subj' > /dev/null");
254:
255: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
256: print SMP 'time='.time.'&mysql=defunct'."\n";
257: close(SMP);
258:
259: exit 1;
260: } else {
261: $dbh->disconnect;
262: }
263:
264: #
265: # Check if other instance running
266: #
267: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
268: if (-e $pidfile) {
269: my $lfh=IO::File->new("$pidfile");
270: my $pide=<$lfh>;
271: chomp($pide);
272: if (kill 0 => $pide) { die "already running"; }
273: }
274:
275: #
276: # Read hosts file
277: #
278: my %hostip;
279: my $thisserver;
280: my $PREFORK=4; # number of children to maintain, at least four spare
281: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
282: while (my $configline=<CONFIG>) {
283: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
284: chomp($ip);
285: $hostip{$ip}=$id;
286: $thisserver=$name if ($id eq $perlvar{'lonHostID'});
287: $PREFORK++;
288: }
289: close(CONFIG);
290: #
291: $PREFORK=int($PREFORK/4);
292:
293: #
294: # Create a socket to talk to lond
295: #
296: my $unixsock = "mysqlsock";
297: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
298: my $server;
299: unlink ($localfile);
300: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
301: Type => SOCK_STREAM,
302: Listen => 10)) {
303: print "in socket error:$@\n";
304: }
305:
306: #
307: # Fork once and dissociate
308: #
309: my $fpid=fork;
310: exit if $fpid;
311: die "Couldn't fork: $!" unless defined ($fpid);
312: POSIX::setsid() or die "Can't start new session: $!";
313:
314: #
315: # Write our PID on disk
316: my $execdir=$perlvar{'lonDaemons'};
317: open (PIDSAVE,">$execdir/logs/lonsql.pid");
318: print PIDSAVE "$$\n";
319: close(PIDSAVE);
320: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
321:
322: #
323: # Ignore signals generated during initial startup
324: $SIG{HUP}=$SIG{USR1}='IGNORE';
325: # Now we are on our own
326: # Fork off our children.
327: for (1 .. $PREFORK) {
328: make_new_child();
329: }
330:
331: #
332: # Install signal handlers.
333: $SIG{CHLD} = \&REAPER;
334: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
335: $SIG{HUP} = \&HUPSMAN;
336:
337: #
338: # And maintain the population.
339: while (1) {
340: sleep; # wait for a signal (i.e., child's death)
341: for (my $i = $children; $i < $PREFORK; $i++) {
342: make_new_child(); # top up the child pool
343: }
344: }
345:
346: ########################################################
347: ########################################################
348:
349: =pod
350:
351: =item &make_new_child
352:
353: Inputs: None
354:
355: Returns: None
356:
357: =cut
358:
359: ########################################################
360: ########################################################
361: sub make_new_child {
362: my $pid;
363: my $sigset;
364: #
365: # block signal for fork
366: $sigset = POSIX::SigSet->new(SIGINT);
367: sigprocmask(SIG_BLOCK, $sigset)
368: or die "Can't block SIGINT for fork: $!\n";
369: #
370: die "fork: $!" unless defined ($pid = fork);
371: #
372: if ($pid) {
373: # Parent records the child's birth and returns.
374: sigprocmask(SIG_UNBLOCK, $sigset)
375: or die "Can't unblock SIGINT for fork: $!\n";
376: $children{$pid} = 1;
377: $children++;
378: return;
379: } else {
380: # Child can *not* return from this subroutine.
381: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
382: # unblock signals
383: sigprocmask(SIG_UNBLOCK, $sigset)
384: or die "Can't unblock SIGINT for fork: $!\n";
385: #open database handle
386: # making dbh global to avoid garbage collector
387: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
388: $perlvar{'lonSqlAccess'},
389: { RaiseError =>0,PrintError=>0})) {
390: sleep(10+int(rand(20)));
391: &logthis("<font color=blue>WARNING: Couldn't connect to database".
392: ": $@</font>");
393: # "($st secs): $@</font>");
394: print "database handle error\n";
395: exit;
396: }
397: # make sure that a database disconnection occurs with
398: # ending kill signals
399: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
400: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
401: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
402: my $client = $server->accept() or last;
403: # do something with the connection
404: $run = $run+1;
405: my $userinput = <$client>;
406: chomp($userinput);
407: #
408: my ($conserver,$query,
409: $arg1,$arg2,$arg3)=split(/&/,$userinput);
410: my $query=unescape($query);
411: #
412: #send query id which is pid_unixdatetime_runningcounter
413: my $queryid = $thisserver;
414: $queryid .="_".($$)."_";
415: $queryid .= time."_";
416: $queryid .= $run;
417: print $client "$queryid\n";
418: #
419: &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
420: sleep 1;
421: #
422: my $result='';
423: #
424: # At this point, query is received, query-ID assigned and sent
425: # back, $query eq 'logquery' will mean that this is a query
426: # against log-files
427: if (($query eq 'userlog') || ($query eq 'courselog')) {
428: # beginning of log query
429: my $udom = &unescape($arg1);
430: my $uname = &unescape($arg2);
431: my $command = &unescape($arg3);
432: my $path = &propath($udom,$uname);
433: if (-e "$path/activity.log") {
434: if ($query eq 'userlog') {
435: $result=&userlog($path,$command);
436: } else {
437: $result=&courselog($path,$command);
438: }
439: } else {
440: &logthis('Unable to do log query: '.$uname.'@'.$udom);
441: $result='no_such_file';
442: }
443: # end of log query
444: } else {
445: # Do an sql query
446: $result = &do_sql_query($query,$arg1,$arg2);
447: }
448: # result does not need to be escaped because it has already been
449: # escaped.
450: #$result=&escape($result);
451: # reply with result, append \n unless already there
452: $result.="\n" unless ($result=~/\n$/);
453: &reply("queryreply:$queryid:$result",$conserver);
454: }
455: # tidy up gracefully and finish
456: #
457: # close the database handle
458: $dbh->disconnect
459: or &logthis("<font color=blue>WARNING: Couldn't disconnect".
460: " from database $DBI::errstr : $@</font>");
461: # this exit is VERY important, otherwise the child will become
462: # a producer of more and more children, forking yourself into
463: # process death.
464: exit;
465: }
466: }
467:
468: ########################################################
469: ########################################################
470:
471: =pod
472:
473: =item &do_sql_query
474:
475: Runs an sql metadata table query.
476:
477: Inputs: $query, $custom, $customshow
478:
479: Returns: A string containing escaped results.
480:
481: =cut
482:
483: ########################################################
484: ########################################################
485: {
486: my @metalist;
487:
488: sub process_file {
489: if ( -e $_ && # file exists
490: -f $_ && # and is a normal file
491: /\.meta$/ && # ends in meta
492: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
493: ) {
494: push(@metalist,$File::Find::name);
495: }
496: }
497:
498: sub do_sql_query {
499: my ($query,$custom,$customshow) = @_;
500: $custom = &unescape($custom);
501: $customshow = &unescape($customshow);
502: #
503: @metalist = ();
504: #
505: my $result = '';
506: my @results = ();
507: my @files;
508: my $subsetflag=0;
509: #
510: if ($query) {
511: #prepare and execute the query
512: my $sth = $dbh->prepare($query);
513: unless ($sth->execute()) {
514: &logthis("<font color=blue>WARNING: ".
515: "Could not retrieve from database: $@</font>");
516: } else {
517: my $aref=$sth->fetchall_arrayref;
518: foreach my $row (@$aref) {
519: push @files,@{$row}[3] if ($custom or $customshow);
520: my @b=map { &escape($_); } @$row;
521: push @results,join(",", @b);
522: # Build up the @files array with the LON-CAPA urls
523: # of the resources.
524: }
525: }
526: }
527: # do custom metadata searching here and build into result
528: return join("&",@results) if (! ($custom or $customshow));
529: # Only get here if there is a custom query or custom show request
530: &logthis("Doing custom query for $custom");
531: if ($query) {
532: @metalist=map {
533: $perlvar{'lonDocRoot'}.$_.'.meta';
534: } @files;
535: } else {
536: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
537: @metalist=();
538: opendir(RESOURCES,$dir);
539: my @homeusers=grep {
540: &ishome($dir.'/'.$_);
541: } grep {!/^\.\.?$/} readdir(RESOURCES);
542: closedir RESOURCES;
543: # Define the
544: foreach my $user (@homeusers) {
545: find (\&process_file,$dir.'/'.$user);
546: }
547: }
548: # if file is indicated in sql database and
549: # not part of sql-relevant query, do not pattern match.
550: #
551: # if file is not in sql database, output error.
552: #
553: # if file is indicated in sql database and is
554: # part of query result list, then do the pattern match.
555: my $customresult='';
556: my @results;
557: foreach my $metafile (@metalist) {
558: my $fh=IO::File->new($metafile);
559: my @lines=<$fh>;
560: my $stuff=join('',@lines);
561: if ($stuff=~/$custom/s) {
562: foreach my $f ('abstract','author','copyright',
563: 'creationdate','keywords','language',
564: 'lastrevisiondate','mime','notes',
565: 'owner','subject','title') {
566: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
567: }
568: my $mfile=$metafile;
569: my $docroot=$perlvar{'lonDocRoot'};
570: $mfile=~s/^$docroot//;
571: $mfile=~s/\.meta$//;
572: unless ($query) {
573: my $q2="SELECT * FROM metadata WHERE url ".
574: " LIKE BINARY '?'";
575: my $sth = $dbh->prepare($q2);
576: $sth->execute($mfile);
577: my $aref=$sth->fetchall_arrayref;
578: foreach my $a (@$aref) {
579: my @b=map { &escape($_)} @$a;
580: push @results,join(",", @b);
581: }
582: }
583: # &logthis("found: $stuff");
584: $customresult.='&custom='.&escape($mfile).','.
585: escape($stuff);
586: }
587: }
588: $result=join("&",@results) unless $query;
589: $result.=$customresult;
590: #
591: return $result;
592: } # End of &do_sql_query
593:
594: } # End of scoping curly braces for &process_file and &do_sql_query
595: ########################################################
596: ########################################################
597:
598: =pod
599:
600: =item &logthis
601:
602: Inputs: $message, the message to log
603:
604: Returns: nothing
605:
606: Writes $message to the logfile.
607:
608: =cut
609:
610: ########################################################
611: ########################################################
612: sub logthis {
613: my $message=shift;
614: my $execdir=$perlvar{'lonDaemons'};
615: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
616: my $now=time;
617: my $local=localtime($now);
618: print $fh "$local ($$): $message\n";
619: }
620:
621: # -------------------------------------------------- Non-critical communication
622:
623: ########################################################
624: ########################################################
625:
626: =pod
627:
628: =item &subreply
629:
630: Sends a command to a server. Called only by &reply.
631:
632: Inputs: $cmd,$server
633:
634: Returns: The results of the message or 'con_lost' on error.
635:
636: =cut
637:
638: ########################################################
639: ########################################################
640: sub subreply {
641: my ($cmd,$server)=@_;
642: my $peerfile="$perlvar{'lonSockDir'}/$server";
643: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
644: Type => SOCK_STREAM,
645: Timeout => 10)
646: or return "con_lost";
647: print $sclient "$cmd\n";
648: my $answer=<$sclient>;
649: chomp($answer);
650: $answer="con_lost" if (!$answer);
651: return $answer;
652: }
653:
654: ########################################################
655: ########################################################
656:
657: =pod
658:
659: =item &reply
660:
661: Sends a command to a server.
662:
663: Inputs: $cmd,$server
664:
665: Returns: The results of the message or 'con_lost' on error.
666:
667: =cut
668:
669: ########################################################
670: ########################################################
671: sub reply {
672: my ($cmd,$server)=@_;
673: my $answer;
674: if ($server ne $perlvar{'lonHostID'}) {
675: $answer=subreply($cmd,$server);
676: if ($answer eq 'con_lost') {
677: $answer=subreply("ping",$server);
678: $answer=subreply($cmd,$server);
679: }
680: } else {
681: $answer='self_reply';
682: $answer=subreply($cmd,$server);
683: }
684: return $answer;
685: }
686:
687: ########################################################
688: ########################################################
689:
690: =pod
691:
692: =item &escape
693:
694: Escape special characters in a string.
695:
696: Inputs: string to escape
697:
698: Returns: The input string with special characters escaped.
699:
700: =cut
701:
702: ########################################################
703: ########################################################
704: sub escape {
705: my $str=shift;
706: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
707: return $str;
708: }
709:
710: ########################################################
711: ########################################################
712:
713: =pod
714:
715: =item &unescape
716:
717: Unescape special characters in a string.
718:
719: Inputs: string to unescape
720:
721: Returns: The input string with special characters unescaped.
722:
723: =cut
724:
725: ########################################################
726: ########################################################
727: sub unescape {
728: my $str=shift;
729: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
730: return $str;
731: }
732:
733: ########################################################
734: ########################################################
735:
736: =pod
737:
738: =item &ishome
739:
740: Determine if the current machine is the home server for a user.
741: The determination is made by checking the filesystem for the users information.
742:
743: Inputs: $author
744:
745: Returns: 0 - this is not the authors home server, 1 - this is.
746:
747: =cut
748:
749: ########################################################
750: ########################################################
751: sub ishome {
752: my $author=shift;
753: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
754: my ($udom,$uname)=split(/\//,$author);
755: my $proname=propath($udom,$uname);
756: if (-e $proname) {
757: return 1;
758: } else {
759: return 0;
760: }
761: }
762:
763: ########################################################
764: ########################################################
765:
766: =pod
767:
768: =item &propath
769:
770: Inputs: user name, user domain
771:
772: Returns: The full path to the users directory.
773:
774: =cut
775:
776: ########################################################
777: ########################################################
778: sub propath {
779: my ($udom,$uname)=@_;
780: $udom=~s/\W//g;
781: $uname=~s/\W//g;
782: my $subdir=$uname.'__';
783: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
784: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
785: return $proname;
786: }
787:
788: ########################################################
789: ########################################################
790:
791: =pod
792:
793: =item &courselog
794:
795: Inputs: $path, $command
796:
797: Returns: unescaped string of values.
798:
799: =cut
800:
801: ########################################################
802: ########################################################
803: sub courselog {
804: my ($path,$command)=@_;
805: my %filters=();
806: foreach (split(/\:/,&unescape($command))) {
807: my ($name,$value)=split(/\=/,$_);
808: $filters{$name}=$value;
809: }
810: my @results=();
811: open(IN,$path.'/activity.log') or return ('file_error');
812: while (my $line=<IN>) {
813: chomp($line);
814: my ($timestamp,$host,$log)=split(/\:/,$line);
815: #
816: # $log has the actual log entries; currently still escaped, and
817: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
818: # then additionally
819: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
820: # or
821: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
822: #
823: # get delimiter between timestamped entries to be &&&
824: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
825: # now go over all log entries
826: foreach (split(/\&\&\&/,&unescape($log))) {
827: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
828: my $values=&unescape(join(':',@values));
829: $values=~s/\&/\:/g;
830: $res=&unescape($res);
831: my $include=1;
832: if (($filters{'username'}) && ($uname ne $filters{'username'}))
833: { $include=0; }
834: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
835: { $include=0; }
836: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
837: { $include=0; }
838: if (($filters{'start'}) && ($time<$filters{'start'}))
839: { $include=0; }
840: if (($filters{'end'}) && ($time>$filters{'end'}))
841: { $include=0; }
842: if (($filters{'action'} eq 'view') && ($action))
843: { $include=0; }
844: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
845: { $include=0; }
846: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
847: { $include=0; }
848: if ($include) {
849: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
850: $uname.':'.$udom.':'.
851: $action.':'.$values);
852: }
853: }
854: }
855: close IN;
856: return join('&',sort(@results));
857: }
858:
859: ########################################################
860: ########################################################
861:
862: =pod
863:
864: =item &userlog
865:
866: Inputs: $path, $command
867:
868: Returns: unescaped string of values.
869:
870: =cut
871:
872: ########################################################
873: ########################################################
874: sub userlog {
875: my ($path,$command)=@_;
876: my %filters=();
877: foreach (split(/\:/,&unescape($command))) {
878: my ($name,$value)=split(/\=/,$_);
879: $filters{$name}=$value;
880: }
881: my @results=();
882: open(IN,$path.'/activity.log') or return ('file_error');
883: while (my $line=<IN>) {
884: chomp($line);
885: my ($timestamp,$host,$log)=split(/\:/,$line);
886: $log=&unescape($log);
887: my $include=1;
888: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
889: { $include=0; }
890: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
891: { $include=0; }
892: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
893: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
894: { $include=0; }
895: if ($include) {
896: push(@results,$timestamp.':'.$log);
897: }
898: }
899: close IN;
900: return join('&',sort(@results));
901: }
902:
903: ########################################################
904: ########################################################
905:
906: =pod
907:
908: =item Functions required for forking
909:
910: =over 4
911:
912: =item REAPER
913:
914: REAPER takes care of dead children.
915:
916: =item HUNTSMAN
917:
918: Signal handler for SIGINT.
919:
920: =item HUPSMAN
921:
922: Signal handler for SIGHUP
923:
924: =item DISCONNECT
925:
926: Disconnects from database.
927:
928: =back
929:
930: =cut
931:
932: ########################################################
933: ########################################################
934: sub REAPER { # takes care of dead children
935: $SIG{CHLD} = \&REAPER;
936: my $pid = wait;
937: $children --;
938: &logthis("Child $pid died");
939: delete $children{$pid};
940: }
941:
942: sub HUNTSMAN { # signal handler for SIGINT
943: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
944: kill 'INT' => keys %children;
945: my $execdir=$perlvar{'lonDaemons'};
946: unlink("$execdir/logs/lonsql.pid");
947: &logthis("<font color=red>CRITICAL: Shutting down</font>");
948: $unixsock = "mysqlsock";
949: my $port="$perlvar{'lonSockDir'}/$unixsock";
950: unlink($port);
951: exit; # clean up with dignity
952: }
953:
954: sub HUPSMAN { # signal handler for SIGHUP
955: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
956: kill 'INT' => keys %children;
957: close($server); # free up socket
958: &logthis("<font color=red>CRITICAL: Restarting</font>");
959: my $execdir=$perlvar{'lonDaemons'};
960: $unixsock = "mysqlsock";
961: my $port="$perlvar{'lonSockDir'}/$unixsock";
962: unlink($port);
963: exec("$execdir/lonsql"); # here we go again
964: }
965:
966: sub DISCONNECT {
967: $dbh->disconnect or
968: &logthis("<font color=blue>WARNING: Couldn't disconnect from database ".
969: " $DBI::errstr : $@</font>");
970: exit;
971: }
972:
973:
974:
975:
976:
977:
978:
979:
980:
981:
982:
983: # ----------------------------------- POD (plain old documentation, CPAN style)
984:
985: =pod
986:
987: =back
988:
989: =cut
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