Annotation of loncom/lonsql, revision 1.61
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: #
1.61 ! matthew 6: # $Id: lonsql,v 1.60 2004/05/11 21:08:20 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;
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
1.1 harris41 144:
1.51 matthew 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
1.9 harris41 162:
1.51 matthew 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
1.45 www 177:
1.51 matthew 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: #
1.53 harris41 205: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.51 matthew 206: my %perlvar=%{$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");
1.57 www 219:
220: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
221: print SMP 'time='.time.'&mysql=defunct'."\n";
222: close(SMP);
223:
1.51 matthew 224: exit 1;
225: } else {
226: $dbh->disconnect;
227: }
1.52 matthew 228:
1.51 matthew 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: }
1.52 matthew 239:
1.49 www 240: #
1.51 matthew 241: # Read hosts file
1.49 www 242: #
1.51 matthew 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++;
1.45 www 253: }
1.51 matthew 254: close(CONFIG);
255: #
256: $PREFORK=int($PREFORK/4);
1.52 matthew 257:
1.51 matthew 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";
1.45 www 269: }
1.52 matthew 270:
1.51 matthew 271: #
272: # Fork once and dissociate
1.52 matthew 273: #
1.51 matthew 274: my $fpid=fork;
1.1 harris41 275: exit if $fpid;
276: die "Couldn't fork: $!" unless defined ($fpid);
277: POSIX::setsid() or die "Can't start new session: $!";
1.52 matthew 278:
1.51 matthew 279: #
280: # Write our PID on disk
281: my $execdir=$perlvar{'lonDaemons'};
1.1 harris41 282: open (PIDSAVE,">$execdir/logs/lonsql.pid");
283: print PIDSAVE "$$\n";
284: close(PIDSAVE);
1.59 albertel 285: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.52 matthew 286:
1.51 matthew 287: #
288: # Ignore signals generated during initial startup
1.1 harris41 289: $SIG{HUP}=$SIG{USR1}='IGNORE';
1.51 matthew 290: # Now we are on our own
291: # Fork off our children.
1.2 harris41 292: for (1 .. $PREFORK) {
293: make_new_child();
1.1 harris41 294: }
1.52 matthew 295:
1.51 matthew 296: #
1.2 harris41 297: # Install signal handlers.
1.1 harris41 298: $SIG{CHLD} = \&REAPER;
299: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
300: $SIG{HUP} = \&HUPSMAN;
1.52 matthew 301:
1.51 matthew 302: #
1.1 harris41 303: # And maintain the population.
304: while (1) {
305: sleep; # wait for a signal (i.e., child's death)
1.51 matthew 306: for (my $i = $children; $i < $PREFORK; $i++) {
1.2 harris41 307: make_new_child(); # top up the child pool
1.1 harris41 308: }
309: }
310:
1.51 matthew 311: ########################################################
312: ########################################################
313:
314: =pod
315:
316: =item &make_new_child
317:
318: Inputs: None
319:
320: Returns: None
321:
322: =cut
1.2 harris41 323:
1.51 matthew 324: ########################################################
325: ########################################################
1.1 harris41 326: sub make_new_child {
327: my $pid;
328: my $sigset;
1.51 matthew 329: #
1.1 harris41 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";
1.51 matthew 334: #
1.2 harris41 335: die "fork: $!" unless defined ($pid = fork);
1.51 matthew 336: #
1.1 harris41 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 {
1.2 harris41 345: # Child can *not* return from this subroutine.
1.1 harris41 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";
1.2 harris41 350: #open database handle
351: # making dbh global to avoid garbage collector
1.51 matthew 352: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
353: $perlvar{'lonSqlAccess'},
354: { RaiseError =>0,PrintError=>0})) {
355: sleep(10+int(rand(20)));
1.59 albertel 356: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
1.51 matthew 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
1.2 harris41 364: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
1.1 harris41 365: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
1.51 matthew 366: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
367: my $client = $server->accept() or last;
1.2 harris41 368: # do something with the connection
1.1 harris41 369: $run = $run+1;
1.2 harris41 370: my $userinput = <$client>;
371: chomp($userinput);
1.51 matthew 372: #
1.45 www 373: my ($conserver,$query,
374: $arg1,$arg2,$arg3)=split(/&/,$userinput);
375: my $query=unescape($query);
1.51 matthew 376: #
1.2 harris41 377: #send query id which is pid_unixdatetime_runningcounter
1.51 matthew 378: my $queryid = $thisserver;
1.2 harris41 379: $queryid .="_".($$)."_";
380: $queryid .= time."_";
381: $queryid .= $run;
382: print $client "$queryid\n";
1.51 matthew 383: #
1.61 ! matthew 384: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
1.25 harris41 385: sleep 1;
1.51 matthew 386: #
1.45 www 387: my $result='';
1.51 matthew 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: }
1.50 matthew 413: # result does not need to be escaped because it has already been
414: # escaped.
415: #$result=&escape($result);
1.17 harris41 416: &reply("queryreply:$queryid:$result",$conserver);
1.1 harris41 417: }
418: # tidy up gracefully and finish
1.51 matthew 419: #
420: # close the database handle
1.2 harris41 421: $dbh->disconnect
1.59 albertel 422: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
1.51 matthew 423: " from database $DBI::errstr : $@</font>");
1.1 harris41 424: # this exit is VERY important, otherwise the child will become
425: # a producer of more and more children, forking yourself into
426: # process death.
427: exit;
428: }
1.2 harris41 429: }
1.1 harris41 430:
1.51 matthew 431: ########################################################
432: ########################################################
433:
434: =pod
435:
436: =item &do_sql_query
437:
438: Runs an sql metadata table query.
439:
440: Inputs: $query, $custom, $customshow
441:
442: Returns: A string containing escaped results.
443:
444: =cut
445:
446: ########################################################
447: ########################################################
448: {
449: my @metalist;
450:
451: sub process_file {
452: if ( -e $_ && # file exists
453: -f $_ && # and is a normal file
454: /\.meta$/ && # ends in meta
455: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
456: ) {
457: push(@metalist,$File::Find::name);
458: }
459: }
460:
461: sub do_sql_query {
462: my ($query,$custom,$customshow) = @_;
463: $custom = &unescape($custom);
464: $customshow = &unescape($customshow);
465: #
466: @metalist = ();
467: #
468: my $result = '';
469: my @results = ();
470: my @files;
471: my $subsetflag=0;
472: #
473: if ($query) {
474: #prepare and execute the query
475: my $sth = $dbh->prepare($query);
476: unless ($sth->execute()) {
1.59 albertel 477: &logthis('<font color="blue">'.
1.58 matthew 478: 'WARNING: Could not retrieve from database:'.
479: $sth->errstr().'</font>');
1.51 matthew 480: } else {
481: my $aref=$sth->fetchall_arrayref;
482: foreach my $row (@$aref) {
483: push @files,@{$row}[3] if ($custom or $customshow);
484: my @b=map { &escape($_); } @$row;
485: push @results,join(",", @b);
486: # Build up the @files array with the LON-CAPA urls
487: # of the resources.
488: }
489: }
490: }
491: # do custom metadata searching here and build into result
492: return join("&",@results) if (! ($custom or $customshow));
493: # Only get here if there is a custom query or custom show request
494: &logthis("Doing custom query for $custom");
495: if ($query) {
496: @metalist=map {
497: $perlvar{'lonDocRoot'}.$_.'.meta';
498: } @files;
499: } else {
500: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
501: @metalist=();
502: opendir(RESOURCES,$dir);
503: my @homeusers=grep {
504: &ishome($dir.'/'.$_);
505: } grep {!/^\.\.?$/} readdir(RESOURCES);
506: closedir RESOURCES;
507: # Define the
508: foreach my $user (@homeusers) {
509: find (\&process_file,$dir.'/'.$user);
510: }
511: }
512: # if file is indicated in sql database and
513: # not part of sql-relevant query, do not pattern match.
514: #
515: # if file is not in sql database, output error.
516: #
517: # if file is indicated in sql database and is
518: # part of query result list, then do the pattern match.
519: my $customresult='';
520: my @results;
521: foreach my $metafile (@metalist) {
522: my $fh=IO::File->new($metafile);
523: my @lines=<$fh>;
524: my $stuff=join('',@lines);
525: if ($stuff=~/$custom/s) {
526: foreach my $f ('abstract','author','copyright',
527: 'creationdate','keywords','language',
528: 'lastrevisiondate','mime','notes',
529: 'owner','subject','title') {
530: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
531: }
532: my $mfile=$metafile;
533: my $docroot=$perlvar{'lonDocRoot'};
534: $mfile=~s/^$docroot//;
535: $mfile=~s/\.meta$//;
536: unless ($query) {
537: my $q2="SELECT * FROM metadata WHERE url ".
538: " LIKE BINARY '?'";
539: my $sth = $dbh->prepare($q2);
540: $sth->execute($mfile);
541: my $aref=$sth->fetchall_arrayref;
542: foreach my $a (@$aref) {
543: my @b=map { &escape($_)} @$a;
544: push @results,join(",", @b);
545: }
546: }
547: # &logthis("found: $stuff");
548: $customresult.='&custom='.&escape($mfile).','.
549: escape($stuff);
550: }
551: }
552: $result=join("&",@results) unless $query;
553: $result.=$customresult;
554: #
555: return $result;
556: } # End of &do_sql_query
557:
558: } # End of scoping curly braces for &process_file and &do_sql_query
559: ########################################################
560: ########################################################
561:
562: =pod
563:
564: =item &logthis
565:
566: Inputs: $message, the message to log
567:
568: Returns: nothing
569:
570: Writes $message to the logfile.
571:
572: =cut
573:
574: ########################################################
575: ########################################################
576: sub logthis {
577: my $message=shift;
578: my $execdir=$perlvar{'lonDaemons'};
1.52 matthew 579: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
1.51 matthew 580: my $now=time;
581: my $local=localtime($now);
582: print $fh "$local ($$): $message\n";
1.2 harris41 583: }
1.1 harris41 584:
1.2 harris41 585: # -------------------------------------------------- Non-critical communication
1.1 harris41 586:
1.51 matthew 587: ########################################################
588: ########################################################
589:
590: =pod
591:
592: =item &subreply
593:
594: Sends a command to a server. Called only by &reply.
595:
596: Inputs: $cmd,$server
597:
598: Returns: The results of the message or 'con_lost' on error.
599:
600: =cut
601:
602: ########################################################
603: ########################################################
1.2 harris41 604: sub subreply {
605: my ($cmd,$server)=@_;
606: my $peerfile="$perlvar{'lonSockDir'}/$server";
607: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
608: Type => SOCK_STREAM,
609: Timeout => 10)
610: or return "con_lost";
611: print $sclient "$cmd\n";
612: my $answer=<$sclient>;
613: chomp($answer);
1.51 matthew 614: $answer="con_lost" if (!$answer);
1.2 harris41 615: return $answer;
616: }
1.1 harris41 617:
1.51 matthew 618: ########################################################
619: ########################################################
620:
621: =pod
622:
623: =item &reply
624:
625: Sends a command to a server.
626:
627: Inputs: $cmd,$server
628:
629: Returns: The results of the message or 'con_lost' on error.
630:
631: =cut
632:
633: ########################################################
634: ########################################################
1.2 harris41 635: sub reply {
636: my ($cmd,$server)=@_;
637: my $answer;
638: if ($server ne $perlvar{'lonHostID'}) {
639: $answer=subreply($cmd,$server);
640: if ($answer eq 'con_lost') {
641: $answer=subreply("ping",$server);
642: $answer=subreply($cmd,$server);
643: }
644: } else {
645: $answer='self_reply';
1.33 harris41 646: $answer=subreply($cmd,$server);
1.2 harris41 647: }
648: return $answer;
649: }
1.1 harris41 650:
1.51 matthew 651: ########################################################
652: ########################################################
653:
654: =pod
655:
656: =item &escape
657:
658: Escape special characters in a string.
1.3 harris41 659:
1.51 matthew 660: Inputs: string to escape
661:
662: Returns: The input string with special characters escaped.
663:
664: =cut
665:
666: ########################################################
667: ########################################################
1.3 harris41 668: sub escape {
669: my $str=shift;
670: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
671: return $str;
672: }
673:
1.51 matthew 674: ########################################################
675: ########################################################
676:
677: =pod
678:
679: =item &unescape
680:
681: Unescape special characters in a string.
1.3 harris41 682:
1.51 matthew 683: Inputs: string to unescape
684:
685: Returns: The input string with special characters unescaped.
686:
687: =cut
688:
689: ########################################################
690: ########################################################
1.3 harris41 691: sub unescape {
692: my $str=shift;
693: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
694: return $str;
695: }
1.34 harris41 696:
1.51 matthew 697: ########################################################
698: ########################################################
699:
700: =pod
701:
702: =item &ishome
703:
704: Determine if the current machine is the home server for a user.
705: The determination is made by checking the filesystem for the users information.
706:
707: Inputs: $author
708:
709: Returns: 0 - this is not the authors home server, 1 - this is.
710:
711: =cut
712:
713: ########################################################
714: ########################################################
1.34 harris41 715: sub ishome {
716: my $author=shift;
717: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
718: my ($udom,$uname)=split(/\//,$author);
719: my $proname=propath($udom,$uname);
720: if (-e $proname) {
721: return 1;
722: } else {
723: return 0;
724: }
725: }
726:
1.51 matthew 727: ########################################################
728: ########################################################
729:
730: =pod
731:
732: =item &propath
733:
734: Inputs: user name, user domain
735:
736: Returns: The full path to the users directory.
737:
738: =cut
739:
740: ########################################################
741: ########################################################
1.34 harris41 742: sub propath {
743: my ($udom,$uname)=@_;
744: $udom=~s/\W//g;
745: $uname=~s/\W//g;
746: my $subdir=$uname.'__';
747: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
748: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
749: return $proname;
750: }
1.40 harris41 751:
1.51 matthew 752: ########################################################
753: ########################################################
754:
755: =pod
756:
757: =item &courselog
758:
759: Inputs: $path, $command
760:
761: Returns: unescaped string of values.
762:
763: =cut
764:
765: ########################################################
766: ########################################################
767: sub courselog {
768: my ($path,$command)=@_;
769: my %filters=();
770: foreach (split(/\:/,&unescape($command))) {
771: my ($name,$value)=split(/\=/,$_);
772: $filters{$name}=$value;
773: }
774: my @results=();
775: open(IN,$path.'/activity.log') or return ('file_error');
776: while (my $line=<IN>) {
777: chomp($line);
778: my ($timestamp,$host,$log)=split(/\:/,$line);
779: #
780: # $log has the actual log entries; currently still escaped, and
781: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
782: # then additionally
783: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
784: # or
785: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
786: #
787: # get delimiter between timestamped entries to be &&&
788: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
789: # now go over all log entries
790: foreach (split(/\&\&\&/,&unescape($log))) {
791: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
792: my $values=&unescape(join(':',@values));
793: $values=~s/\&/\:/g;
794: $res=&unescape($res);
795: my $include=1;
796: if (($filters{'username'}) && ($uname ne $filters{'username'}))
797: { $include=0; }
798: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
799: { $include=0; }
800: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
801: { $include=0; }
802: if (($filters{'start'}) && ($time<$filters{'start'}))
803: { $include=0; }
804: if (($filters{'end'}) && ($time>$filters{'end'}))
805: { $include=0; }
806: if (($filters{'action'} eq 'view') && ($action))
807: { $include=0; }
808: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
809: { $include=0; }
810: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
811: { $include=0; }
812: if ($include) {
813: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
814: $uname.':'.$udom.':'.
815: $action.':'.$values);
816: }
817: }
818: }
819: close IN;
820: return join('&',sort(@results));
821: }
822:
823: ########################################################
824: ########################################################
825:
826: =pod
827:
828: =item &userlog
829:
830: Inputs: $path, $command
831:
832: Returns: unescaped string of values.
1.40 harris41 833:
1.51 matthew 834: =cut
1.40 harris41 835:
1.51 matthew 836: ########################################################
837: ########################################################
838: sub userlog {
839: my ($path,$command)=@_;
840: my %filters=();
841: foreach (split(/\:/,&unescape($command))) {
842: my ($name,$value)=split(/\=/,$_);
843: $filters{$name}=$value;
844: }
845: my @results=();
846: open(IN,$path.'/activity.log') or return ('file_error');
847: while (my $line=<IN>) {
848: chomp($line);
849: my ($timestamp,$host,$log)=split(/\:/,$line);
850: $log=&unescape($log);
851: my $include=1;
852: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
853: { $include=0; }
854: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
855: { $include=0; }
856: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
857: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
858: { $include=0; }
859: if ($include) {
860: push(@results,$timestamp.':'.$log);
861: }
862: }
863: close IN;
864: return join('&',sort(@results));
1.52 matthew 865: }
866:
867: ########################################################
868: ########################################################
869:
870: =pod
871:
872: =item Functions required for forking
873:
874: =over 4
875:
876: =item REAPER
877:
878: REAPER takes care of dead children.
879:
880: =item HUNTSMAN
881:
882: Signal handler for SIGINT.
883:
884: =item HUPSMAN
885:
886: Signal handler for SIGHUP
887:
888: =item DISCONNECT
889:
890: Disconnects from database.
891:
892: =back
893:
894: =cut
895:
896: ########################################################
897: ########################################################
898: sub REAPER { # takes care of dead children
899: $SIG{CHLD} = \&REAPER;
900: my $pid = wait;
901: $children --;
902: &logthis("Child $pid died");
903: delete $children{$pid};
904: }
905:
906: sub HUNTSMAN { # signal handler for SIGINT
907: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
908: kill 'INT' => keys %children;
909: my $execdir=$perlvar{'lonDaemons'};
910: unlink("$execdir/logs/lonsql.pid");
1.59 albertel 911: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.52 matthew 912: $unixsock = "mysqlsock";
913: my $port="$perlvar{'lonSockDir'}/$unixsock";
914: unlink($port);
915: exit; # clean up with dignity
916: }
917:
918: sub HUPSMAN { # signal handler for SIGHUP
919: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
920: kill 'INT' => keys %children;
921: close($server); # free up socket
1.59 albertel 922: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.52 matthew 923: my $execdir=$perlvar{'lonDaemons'};
924: $unixsock = "mysqlsock";
925: my $port="$perlvar{'lonSockDir'}/$unixsock";
926: unlink($port);
927: exec("$execdir/lonsql"); # here we go again
928: }
929:
930: sub DISCONNECT {
931: $dbh->disconnect or
1.59 albertel 932: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
1.52 matthew 933: " $DBI::errstr : $@</font>");
934: exit;
1.51 matthew 935: }
1.40 harris41 936:
937:
1.51 matthew 938: =pod
1.40 harris41 939:
1.51 matthew 940: =back
1.40 harris41 941:
942: =cut
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