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 1.58 2004/05/03 16:20:57 matthew 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:
119: ########################################################
120: ########################################################
121:
122: =pod
123:
124: =item Global Variables
125:
126: =over 4
127:
128: =item dbh
129:
130: =back
131:
132: =cut
133:
134: ########################################################
135: ########################################################
136: my $dbh;
137:
138: ########################################################
139: ########################################################
140:
141: =pod
142:
143: =item Variables required for forking
144:
145: =over 4
146:
147: =item $MAX_CLIENTS_PER_CHILD
148:
149: The number of clients each child should process.
150:
151: =item %children
152:
153: The keys to %children are the current child process IDs
154:
155: =item $children
156:
157: The current number of children
158:
159: =back
160:
161: =cut
162:
163: ########################################################
164: ########################################################
165: my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
166: my %children = (); # keys are current child process IDs
167: my $children = 0; # current number of children
168:
169: ###################################################################
170: ###################################################################
171:
172: =pod
173:
174: =item Main body of code.
175:
176: =over 4
177:
178: =item Read data from loncapa_apache.conf and loncapa.conf.
179:
180: =item Ensure we can access the database.
181:
182: =item Determine if there are other instances of lonsql running.
183:
184: =item Read the hosts file.
185:
186: =item Create a socket for lonsql.
187:
188: =item Fork once and dissociate from parent.
189:
190: =item Write PID to disk.
191:
192: =item Prefork children and maintain the population of children.
193:
194: =back
195:
196: =cut
197:
198: ###################################################################
199: ###################################################################
200: my $childmaxattempts=10;
201: my $run =0; # running counter to generate the query-id
202: #
203: # Read loncapa_apache.conf and loncapa.conf
204: #
205: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
206: my %perlvar=%{$perlvarref};
207: #
208: # Make sure that database can be accessed
209: #
210: my $dbh;
211: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
212: $perlvar{'lonSqlAccess'},
213: { RaiseError =>0,PrintError=>0})) {
214: print "Cannot connect to database!\n";
215: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
216: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
217: system("echo 'Cannot connect to MySQL database!' |".
218: " mailto $emailto -s '$subj' > /dev/null");
219:
220: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
221: print SMP 'time='.time.'&mysql=defunct'."\n";
222: close(SMP);
223:
224: exit 1;
225: } else {
226: $dbh->disconnect;
227: }
228:
229: #
230: # Check if other instance running
231: #
232: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
233: if (-e $pidfile) {
234: my $lfh=IO::File->new("$pidfile");
235: my $pide=<$lfh>;
236: chomp($pide);
237: if (kill 0 => $pide) { die "already running"; }
238: }
239:
240: #
241: # Read hosts file
242: #
243: my %hostip;
244: my $thisserver;
245: my $PREFORK=4; # number of children to maintain, at least four spare
246: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
247: while (my $configline=<CONFIG>) {
248: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
249: chomp($ip);
250: $hostip{$ip}=$id;
251: $thisserver=$name if ($id eq $perlvar{'lonHostID'});
252: $PREFORK++;
253: }
254: close(CONFIG);
255: #
256: $PREFORK=int($PREFORK/4);
257:
258: #
259: # Create a socket to talk to lond
260: #
261: my $unixsock = "mysqlsock";
262: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
263: my $server;
264: unlink ($localfile);
265: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
266: Type => SOCK_STREAM,
267: Listen => 10)) {
268: print "in socket error:$@\n";
269: }
270:
271: #
272: # Fork once and dissociate
273: #
274: my $fpid=fork;
275: exit if $fpid;
276: die "Couldn't fork: $!" unless defined ($fpid);
277: POSIX::setsid() or die "Can't start new session: $!";
278:
279: #
280: # Write our PID on disk
281: my $execdir=$perlvar{'lonDaemons'};
282: open (PIDSAVE,">$execdir/logs/lonsql.pid");
283: print PIDSAVE "$$\n";
284: close(PIDSAVE);
285: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
286:
287: #
288: # Ignore signals generated during initial startup
289: $SIG{HUP}=$SIG{USR1}='IGNORE';
290: # Now we are on our own
291: # Fork off our children.
292: for (1 .. $PREFORK) {
293: make_new_child();
294: }
295:
296: #
297: # Install signal handlers.
298: $SIG{CHLD} = \&REAPER;
299: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
300: $SIG{HUP} = \&HUPSMAN;
301:
302: #
303: # And maintain the population.
304: while (1) {
305: sleep; # wait for a signal (i.e., child's death)
306: for (my $i = $children; $i < $PREFORK; $i++) {
307: make_new_child(); # top up the child pool
308: }
309: }
310:
311: ########################################################
312: ########################################################
313:
314: =pod
315:
316: =item &make_new_child
317:
318: Inputs: None
319:
320: Returns: None
321:
322: =cut
323:
324: ########################################################
325: ########################################################
326: sub make_new_child {
327: my $pid;
328: my $sigset;
329: #
330: # block signal for fork
331: $sigset = POSIX::SigSet->new(SIGINT);
332: sigprocmask(SIG_BLOCK, $sigset)
333: or die "Can't block SIGINT for fork: $!\n";
334: #
335: die "fork: $!" unless defined ($pid = fork);
336: #
337: if ($pid) {
338: # Parent records the child's birth and returns.
339: sigprocmask(SIG_UNBLOCK, $sigset)
340: or die "Can't unblock SIGINT for fork: $!\n";
341: $children{$pid} = 1;
342: $children++;
343: return;
344: } else {
345: # Child can *not* return from this subroutine.
346: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
347: # unblock signals
348: sigprocmask(SIG_UNBLOCK, $sigset)
349: or die "Can't unblock SIGINT for fork: $!\n";
350: #open database handle
351: # making dbh global to avoid garbage collector
352: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
353: $perlvar{'lonSqlAccess'},
354: { RaiseError =>0,PrintError=>0})) {
355: sleep(10+int(rand(20)));
356: &logthis("<font color=blue>WARNING: Couldn't connect to database".
357: ": $@</font>");
358: # "($st secs): $@</font>");
359: print "database handle error\n";
360: exit;
361: }
362: # make sure that a database disconnection occurs with
363: # ending kill signals
364: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
365: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
366: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
367: my $client = $server->accept() or last;
368: # do something with the connection
369: $run = $run+1;
370: my $userinput = <$client>;
371: chomp($userinput);
372: #
373: my ($conserver,$query,
374: $arg1,$arg2,$arg3)=split(/&/,$userinput);
375: my $query=unescape($query);
376: #
377: #send query id which is pid_unixdatetime_runningcounter
378: my $queryid = $thisserver;
379: $queryid .="_".($$)."_";
380: $queryid .= time."_";
381: $queryid .= $run;
382: print $client "$queryid\n";
383: #
384: &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
385: sleep 1;
386: #
387: my $result='';
388: #
389: # At this point, query is received, query-ID assigned and sent
390: # back, $query eq 'logquery' will mean that this is a query
391: # against log-files
392: if (($query eq 'userlog') || ($query eq 'courselog')) {
393: # beginning of log query
394: my $udom = &unescape($arg1);
395: my $uname = &unescape($arg2);
396: my $command = &unescape($arg3);
397: my $path = &propath($udom,$uname);
398: if (-e "$path/activity.log") {
399: if ($query eq 'userlog') {
400: $result=&userlog($path,$command);
401: } else {
402: $result=&courselog($path,$command);
403: }
404: } else {
405: &logthis('Unable to do log query: '.$uname.'@'.$udom);
406: $result='no_such_file';
407: }
408: # end of log query
409: } else {
410: # Do an sql query
411: $result = &do_sql_query($query,$arg1,$arg2);
412: }
413: # result does not need to be escaped because it has already been
414: # escaped.
415: #$result=&escape($result);
416: # reply with result, append \n unless already there
417: $result.="\n" unless ($result=~/\n$/);
418: &reply("queryreply:$queryid:$result",$conserver);
419: }
420: # tidy up gracefully and finish
421: #
422: # close the database handle
423: $dbh->disconnect
424: or &logthis("<font color=blue>WARNING: Couldn't disconnect".
425: " from database $DBI::errstr : $@</font>");
426: # this exit is VERY important, otherwise the child will become
427: # a producer of more and more children, forking yourself into
428: # process death.
429: exit;
430: }
431: }
432:
433: ########################################################
434: ########################################################
435:
436: =pod
437:
438: =item &do_sql_query
439:
440: Runs an sql metadata table query.
441:
442: Inputs: $query, $custom, $customshow
443:
444: Returns: A string containing escaped results.
445:
446: =cut
447:
448: ########################################################
449: ########################################################
450: {
451: my @metalist;
452:
453: sub process_file {
454: if ( -e $_ && # file exists
455: -f $_ && # and is a normal file
456: /\.meta$/ && # ends in meta
457: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
458: ) {
459: push(@metalist,$File::Find::name);
460: }
461: }
462:
463: sub do_sql_query {
464: my ($query,$custom,$customshow) = @_;
465: $custom = &unescape($custom);
466: $customshow = &unescape($customshow);
467: #
468: @metalist = ();
469: #
470: my $result = '';
471: my @results = ();
472: my @files;
473: my $subsetflag=0;
474: #
475: if ($query) {
476: #prepare and execute the query
477: my $sth = $dbh->prepare($query);
478: unless ($sth->execute()) {
479: &logthis('<font color=blue>'.
480: 'WARNING: Could not retrieve from database:'.
481: $sth->errstr().'</font>');
482: } else {
483: my $aref=$sth->fetchall_arrayref;
484: foreach my $row (@$aref) {
485: push @files,@{$row}[3] if ($custom or $customshow);
486: my @b=map { &escape($_); } @$row;
487: push @results,join(",", @b);
488: # Build up the @files array with the LON-CAPA urls
489: # of the resources.
490: }
491: }
492: }
493: # do custom metadata searching here and build into result
494: return join("&",@results) if (! ($custom or $customshow));
495: # Only get here if there is a custom query or custom show request
496: &logthis("Doing custom query for $custom");
497: if ($query) {
498: @metalist=map {
499: $perlvar{'lonDocRoot'}.$_.'.meta';
500: } @files;
501: } else {
502: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
503: @metalist=();
504: opendir(RESOURCES,$dir);
505: my @homeusers=grep {
506: &ishome($dir.'/'.$_);
507: } grep {!/^\.\.?$/} readdir(RESOURCES);
508: closedir RESOURCES;
509: # Define the
510: foreach my $user (@homeusers) {
511: find (\&process_file,$dir.'/'.$user);
512: }
513: }
514: # if file is indicated in sql database and
515: # not part of sql-relevant query, do not pattern match.
516: #
517: # if file is not in sql database, output error.
518: #
519: # if file is indicated in sql database and is
520: # part of query result list, then do the pattern match.
521: my $customresult='';
522: my @results;
523: foreach my $metafile (@metalist) {
524: my $fh=IO::File->new($metafile);
525: my @lines=<$fh>;
526: my $stuff=join('',@lines);
527: if ($stuff=~/$custom/s) {
528: foreach my $f ('abstract','author','copyright',
529: 'creationdate','keywords','language',
530: 'lastrevisiondate','mime','notes',
531: 'owner','subject','title') {
532: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
533: }
534: my $mfile=$metafile;
535: my $docroot=$perlvar{'lonDocRoot'};
536: $mfile=~s/^$docroot//;
537: $mfile=~s/\.meta$//;
538: unless ($query) {
539: my $q2="SELECT * FROM metadata WHERE url ".
540: " LIKE BINARY '?'";
541: my $sth = $dbh->prepare($q2);
542: $sth->execute($mfile);
543: my $aref=$sth->fetchall_arrayref;
544: foreach my $a (@$aref) {
545: my @b=map { &escape($_)} @$a;
546: push @results,join(",", @b);
547: }
548: }
549: # &logthis("found: $stuff");
550: $customresult.='&custom='.&escape($mfile).','.
551: escape($stuff);
552: }
553: }
554: $result=join("&",@results) unless $query;
555: $result.=$customresult;
556: #
557: return $result;
558: } # End of &do_sql_query
559:
560: } # End of scoping curly braces for &process_file and &do_sql_query
561: ########################################################
562: ########################################################
563:
564: =pod
565:
566: =item &logthis
567:
568: Inputs: $message, the message to log
569:
570: Returns: nothing
571:
572: Writes $message to the logfile.
573:
574: =cut
575:
576: ########################################################
577: ########################################################
578: sub logthis {
579: my $message=shift;
580: my $execdir=$perlvar{'lonDaemons'};
581: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
582: my $now=time;
583: my $local=localtime($now);
584: print $fh "$local ($$): $message\n";
585: }
586:
587: # -------------------------------------------------- Non-critical communication
588:
589: ########################################################
590: ########################################################
591:
592: =pod
593:
594: =item &subreply
595:
596: Sends a command to a server. Called only by &reply.
597:
598: Inputs: $cmd,$server
599:
600: Returns: The results of the message or 'con_lost' on error.
601:
602: =cut
603:
604: ########################################################
605: ########################################################
606: sub subreply {
607: my ($cmd,$server)=@_;
608: my $peerfile="$perlvar{'lonSockDir'}/$server";
609: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
610: Type => SOCK_STREAM,
611: Timeout => 10)
612: or return "con_lost";
613: print $sclient "$cmd\n";
614: my $answer=<$sclient>;
615: chomp($answer);
616: $answer="con_lost" if (!$answer);
617: return $answer;
618: }
619:
620: ########################################################
621: ########################################################
622:
623: =pod
624:
625: =item &reply
626:
627: Sends a command to a server.
628:
629: Inputs: $cmd,$server
630:
631: Returns: The results of the message or 'con_lost' on error.
632:
633: =cut
634:
635: ########################################################
636: ########################################################
637: sub reply {
638: my ($cmd,$server)=@_;
639: my $answer;
640: if ($server ne $perlvar{'lonHostID'}) {
641: $answer=subreply($cmd,$server);
642: if ($answer eq 'con_lost') {
643: $answer=subreply("ping",$server);
644: $answer=subreply($cmd,$server);
645: }
646: } else {
647: $answer='self_reply';
648: $answer=subreply($cmd,$server);
649: }
650: return $answer;
651: }
652:
653: ########################################################
654: ########################################################
655:
656: =pod
657:
658: =item &escape
659:
660: Escape special characters in a string.
661:
662: Inputs: string to escape
663:
664: Returns: The input string with special characters escaped.
665:
666: =cut
667:
668: ########################################################
669: ########################################################
670: sub escape {
671: my $str=shift;
672: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
673: return $str;
674: }
675:
676: ########################################################
677: ########################################################
678:
679: =pod
680:
681: =item &unescape
682:
683: Unescape special characters in a string.
684:
685: Inputs: string to unescape
686:
687: Returns: The input string with special characters unescaped.
688:
689: =cut
690:
691: ########################################################
692: ########################################################
693: sub unescape {
694: my $str=shift;
695: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
696: return $str;
697: }
698:
699: ########################################################
700: ########################################################
701:
702: =pod
703:
704: =item &ishome
705:
706: Determine if the current machine is the home server for a user.
707: The determination is made by checking the filesystem for the users information.
708:
709: Inputs: $author
710:
711: Returns: 0 - this is not the authors home server, 1 - this is.
712:
713: =cut
714:
715: ########################################################
716: ########################################################
717: sub ishome {
718: my $author=shift;
719: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
720: my ($udom,$uname)=split(/\//,$author);
721: my $proname=propath($udom,$uname);
722: if (-e $proname) {
723: return 1;
724: } else {
725: return 0;
726: }
727: }
728:
729: ########################################################
730: ########################################################
731:
732: =pod
733:
734: =item &propath
735:
736: Inputs: user name, user domain
737:
738: Returns: The full path to the users directory.
739:
740: =cut
741:
742: ########################################################
743: ########################################################
744: sub propath {
745: my ($udom,$uname)=@_;
746: $udom=~s/\W//g;
747: $uname=~s/\W//g;
748: my $subdir=$uname.'__';
749: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
750: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
751: return $proname;
752: }
753:
754: ########################################################
755: ########################################################
756:
757: =pod
758:
759: =item &courselog
760:
761: Inputs: $path, $command
762:
763: Returns: unescaped string of values.
764:
765: =cut
766:
767: ########################################################
768: ########################################################
769: sub courselog {
770: my ($path,$command)=@_;
771: my %filters=();
772: foreach (split(/\:/,&unescape($command))) {
773: my ($name,$value)=split(/\=/,$_);
774: $filters{$name}=$value;
775: }
776: my @results=();
777: open(IN,$path.'/activity.log') or return ('file_error');
778: while (my $line=<IN>) {
779: chomp($line);
780: my ($timestamp,$host,$log)=split(/\:/,$line);
781: #
782: # $log has the actual log entries; currently still escaped, and
783: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
784: # then additionally
785: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
786: # or
787: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
788: #
789: # get delimiter between timestamped entries to be &&&
790: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
791: # now go over all log entries
792: foreach (split(/\&\&\&/,&unescape($log))) {
793: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
794: my $values=&unescape(join(':',@values));
795: $values=~s/\&/\:/g;
796: $res=&unescape($res);
797: my $include=1;
798: if (($filters{'username'}) && ($uname ne $filters{'username'}))
799: { $include=0; }
800: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
801: { $include=0; }
802: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
803: { $include=0; }
804: if (($filters{'start'}) && ($time<$filters{'start'}))
805: { $include=0; }
806: if (($filters{'end'}) && ($time>$filters{'end'}))
807: { $include=0; }
808: if (($filters{'action'} eq 'view') && ($action))
809: { $include=0; }
810: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
811: { $include=0; }
812: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
813: { $include=0; }
814: if ($include) {
815: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
816: $uname.':'.$udom.':'.
817: $action.':'.$values);
818: }
819: }
820: }
821: close IN;
822: return join('&',sort(@results));
823: }
824:
825: ########################################################
826: ########################################################
827:
828: =pod
829:
830: =item &userlog
831:
832: Inputs: $path, $command
833:
834: Returns: unescaped string of values.
835:
836: =cut
837:
838: ########################################################
839: ########################################################
840: sub userlog {
841: my ($path,$command)=@_;
842: my %filters=();
843: foreach (split(/\:/,&unescape($command))) {
844: my ($name,$value)=split(/\=/,$_);
845: $filters{$name}=$value;
846: }
847: my @results=();
848: open(IN,$path.'/activity.log') or return ('file_error');
849: while (my $line=<IN>) {
850: chomp($line);
851: my ($timestamp,$host,$log)=split(/\:/,$line);
852: $log=&unescape($log);
853: my $include=1;
854: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
855: { $include=0; }
856: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
857: { $include=0; }
858: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
859: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
860: { $include=0; }
861: if ($include) {
862: push(@results,$timestamp.':'.$log);
863: }
864: }
865: close IN;
866: return join('&',sort(@results));
867: }
868:
869: ########################################################
870: ########################################################
871:
872: =pod
873:
874: =item Functions required for forking
875:
876: =over 4
877:
878: =item REAPER
879:
880: REAPER takes care of dead children.
881:
882: =item HUNTSMAN
883:
884: Signal handler for SIGINT.
885:
886: =item HUPSMAN
887:
888: Signal handler for SIGHUP
889:
890: =item DISCONNECT
891:
892: Disconnects from database.
893:
894: =back
895:
896: =cut
897:
898: ########################################################
899: ########################################################
900: sub REAPER { # takes care of dead children
901: $SIG{CHLD} = \&REAPER;
902: my $pid = wait;
903: $children --;
904: &logthis("Child $pid died");
905: delete $children{$pid};
906: }
907:
908: sub HUNTSMAN { # signal handler for SIGINT
909: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
910: kill 'INT' => keys %children;
911: my $execdir=$perlvar{'lonDaemons'};
912: unlink("$execdir/logs/lonsql.pid");
913: &logthis("<font color=red>CRITICAL: Shutting down</font>");
914: $unixsock = "mysqlsock";
915: my $port="$perlvar{'lonSockDir'}/$unixsock";
916: unlink($port);
917: exit; # clean up with dignity
918: }
919:
920: sub HUPSMAN { # signal handler for SIGHUP
921: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
922: kill 'INT' => keys %children;
923: close($server); # free up socket
924: &logthis("<font color=red>CRITICAL: Restarting</font>");
925: my $execdir=$perlvar{'lonDaemons'};
926: $unixsock = "mysqlsock";
927: my $port="$perlvar{'lonSockDir'}/$unixsock";
928: unlink($port);
929: exec("$execdir/lonsql"); # here we go again
930: }
931:
932: sub DISCONNECT {
933: $dbh->disconnect or
934: &logthis("<font color=blue>WARNING: Couldn't disconnect from database ".
935: " $DBI::errstr : $@</font>");
936: exit;
937: }
938:
939:
940: =pod
941:
942: =back
943:
944: =cut
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonsql CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom