Annotation of loncom/lonsql, revision 1.71.2.1
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: #
1.71.2.1! albertel 6: # $Id: lonsql,v 1.71 2006/02/07 16:20:39 albertel Exp $
1.41 harris41 7: #
8: # Copyright Michigan State University Board of Trustees
9: #
10: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
11: #
12: # LON-CAPA is free software; you can redistribute it and/or modify
13: # it under the terms of the GNU General Public License as published by
14: # the Free Software Foundation; either version 2 of the License, or
15: # (at your option) any later version.
16: #
17: # LON-CAPA is distributed in the hope that it will be useful,
18: # but WITHOUT ANY WARRANTY; without even the implied warranty of
19: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20: # GNU General Public License for more details.
21: #
22: # You should have received a copy of the GNU General Public License
23: # along with LON-CAPA; if not, write to the Free Software
24: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25: #
26: # /home/httpd/html/adm/gpl.txt
27: #
28: # http://www.lon-capa.org/
29: #
1.51 matthew 30:
31: =pod
32:
33: =head1 NAME
34:
35: lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
36:
37: =head1 SYNOPSIS
38:
39: This script should be run as user=www.
40: Note that a lonsql.pid file contains the pid of the parent process.
41:
1.56 bowersj2 42: =head1 OVERVIEW
1.51 matthew 43:
1.56 bowersj2 44: =head2 Purpose within LON-CAPA
45:
46: LON-CAPA is meant to distribute A LOT of educational content to A LOT
47: of people. It is ineffective to directly rely on contents within the
48: ext2 filesystem to be speedily scanned for on-the-fly searches of
49: content descriptions. (Simply put, it takes a cumbersome amount of
50: time to open, read, analyze, and close thousands of files.)
51:
52: The solution is to index various data fields that are descriptive of
53: the educational resources on a LON-CAPA server machine in a
54: database. Descriptive data fields are referred to as "metadata". The
55: question then arises as to how this metadata is handled in terms of
56: the rest of the LON-CAPA network without burdening client and daemon
57: processes.
58:
59: The obvious solution, using lonc to send a query to a lond process,
60: doesn't work so well in general as you can see in the following
61: example:
62:
63: lonc= loncapa client process A-lonc= a lonc process on Server A
64: lond= loncapa daemon process
65:
66: database command
67: A-lonc --------TCP/IP----------------> B-lond
68:
69: The problem emerges that A-lonc and B-lond are kept waiting for the
70: MySQL server to "do its stuff", or in other words, perform the
71: conceivably sophisticated, data-intensive, time-sucking database
72: transaction. By tying up a lonc and lond process, this significantly
73: cripples the capabilities of LON-CAPA servers.
74:
75: The solution is to offload the work onto another process, and use
76: lonc and lond just for requests and notifications of completed
77: processing:
78:
79: database command
80:
81: A-lonc ---------TCP/IP-----------------> B-lond =====> B-lonsql
82: <---------------------------------/ |
83: "ok, I'll get back to you..." |
84: |
85: /
86: A-lond <------------------------------- B-lonc <======
87: "Guess what? I have the result!"
88:
89: Of course, depending on success or failure, the messages may vary, but
90: the principle remains the same where a separate pool of children
91: processes (lonsql's) handle the MySQL database manipulations.
92:
93: Thus, lonc and lond spend effectively no time waiting on results from
94: the database.
1.51 matthew 95:
96: =head1 Internals
97:
98: =over 4
99:
100: =cut
101:
102: use strict;
1.36 www 103:
1.42 harris41 104: use lib '/home/httpd/lib/perl/';
105: use LONCAPA::Configuration;
1.58 matthew 106: use LONCAPA::lonmetadata();
1.42 harris41 107:
1.2 harris41 108: use IO::Socket;
109: use Symbol;
1.1 harris41 110: use POSIX;
111: use IO::Select;
112: use IO::File;
113: use Socket;
114: use Fcntl;
115: use Tie::RefHash;
116: use DBI;
1.51 matthew 117: use File::Find;
1.62 raeburn 118: use localenroll;
1.51 matthew 119:
120: ########################################################
121: ########################################################
122:
123: =pod
124:
125: =item Global Variables
126:
127: =over 4
128:
129: =item dbh
130:
131: =back
132:
133: =cut
134:
135: ########################################################
136: ########################################################
137: my $dbh;
138:
139: ########################################################
140: ########################################################
141:
142: =pod
143:
144: =item Variables required for forking
1.1 harris41 145:
1.51 matthew 146: =over 4
147:
148: =item $MAX_CLIENTS_PER_CHILD
149:
150: The number of clients each child should process.
151:
152: =item %children
153:
154: The keys to %children are the current child process IDs
155:
156: =item $children
157:
158: The current number of children
159:
160: =back
161:
162: =cut
1.9 harris41 163:
1.51 matthew 164: ########################################################
165: ########################################################
166: my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
167: my %children = (); # keys are current child process IDs
168: my $children = 0; # current number of children
169:
170: ###################################################################
171: ###################################################################
172:
173: =pod
174:
175: =item Main body of code.
176:
177: =over 4
1.45 www 178:
1.51 matthew 179: =item Read data from loncapa_apache.conf and loncapa.conf.
180:
181: =item Ensure we can access the database.
182:
183: =item Determine if there are other instances of lonsql running.
184:
185: =item Read the hosts file.
186:
187: =item Create a socket for lonsql.
188:
189: =item Fork once and dissociate from parent.
190:
191: =item Write PID to disk.
192:
193: =item Prefork children and maintain the population of children.
194:
195: =back
196:
197: =cut
198:
199: ###################################################################
200: ###################################################################
201: my $childmaxattempts=10;
202: my $run =0; # running counter to generate the query-id
203: #
204: # Read loncapa_apache.conf and loncapa.conf
205: #
1.53 harris41 206: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.51 matthew 207: my %perlvar=%{$perlvarref};
208: #
1.63 matthew 209: # Write the /home/www/.my.cnf file
210: my $conf_file = '/home/www/.my.cnf';
211: if (! -e $conf_file) {
212: if (open MYCNF, ">$conf_file") {
213: print MYCNF <<"ENDMYCNF";
214: [client]
215: user=www
216: password=$perlvar{'lonSqlAccess'}
217: ENDMYCNF
218: close MYCNF;
219: } else {
220: warn "Unable to write $conf_file, continuing";
221: }
222: }
223:
224:
225: #
1.51 matthew 226: # Make sure that database can be accessed
227: #
228: my $dbh;
229: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
230: $perlvar{'lonSqlAccess'},
231: { RaiseError =>0,PrintError=>0})) {
232: print "Cannot connect to database!\n";
233: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
234: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
235: system("echo 'Cannot connect to MySQL database!' |".
236: " mailto $emailto -s '$subj' > /dev/null");
1.57 www 237:
238: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
239: print SMP 'time='.time.'&mysql=defunct'."\n";
240: close(SMP);
241:
1.51 matthew 242: exit 1;
243: } else {
1.67 albertel 244: unlink('/home/httpd/html/lon-status/mysql.txt');
1.51 matthew 245: $dbh->disconnect;
246: }
1.52 matthew 247:
1.51 matthew 248: #
249: # Check if other instance running
250: #
251: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
252: if (-e $pidfile) {
253: my $lfh=IO::File->new("$pidfile");
254: my $pide=<$lfh>;
255: chomp($pide);
256: if (kill 0 => $pide) { die "already running"; }
257: }
1.52 matthew 258:
1.49 www 259: #
1.51 matthew 260: # Read hosts file
1.49 www 261: #
1.51 matthew 262: my $thisserver;
263: my $PREFORK=4; # number of children to maintain, at least four spare
264: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
265: while (my $configline=<CONFIG>) {
1.66 albertel 266: my ($id,$domain,$role,$name)=split(/:/,$configline);
267: $name=~s/\s//g;
1.51 matthew 268: $thisserver=$name if ($id eq $perlvar{'lonHostID'});
1.65 albertel 269: #$PREFORK++;
1.45 www 270: }
1.51 matthew 271: close(CONFIG);
272: #
1.65 albertel 273: #$PREFORK=int($PREFORK/4);
1.52 matthew 274:
1.51 matthew 275: #
276: # Create a socket to talk to lond
277: #
278: my $unixsock = "mysqlsock";
279: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
280: my $server;
281: unlink ($localfile);
282: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
283: Type => SOCK_STREAM,
284: Listen => 10)) {
285: print "in socket error:$@\n";
1.45 www 286: }
1.52 matthew 287:
1.51 matthew 288: #
289: # Fork once and dissociate
1.52 matthew 290: #
1.51 matthew 291: my $fpid=fork;
1.1 harris41 292: exit if $fpid;
293: die "Couldn't fork: $!" unless defined ($fpid);
294: POSIX::setsid() or die "Can't start new session: $!";
1.52 matthew 295:
1.51 matthew 296: #
297: # Write our PID on disk
298: my $execdir=$perlvar{'lonDaemons'};
1.1 harris41 299: open (PIDSAVE,">$execdir/logs/lonsql.pid");
300: print PIDSAVE "$$\n";
301: close(PIDSAVE);
1.59 albertel 302: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.52 matthew 303:
1.51 matthew 304: #
305: # Ignore signals generated during initial startup
1.1 harris41 306: $SIG{HUP}=$SIG{USR1}='IGNORE';
1.51 matthew 307: # Now we are on our own
308: # Fork off our children.
1.2 harris41 309: for (1 .. $PREFORK) {
310: make_new_child();
1.1 harris41 311: }
1.52 matthew 312:
1.51 matthew 313: #
1.2 harris41 314: # Install signal handlers.
1.1 harris41 315: $SIG{CHLD} = \&REAPER;
316: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
317: $SIG{HUP} = \&HUPSMAN;
1.52 matthew 318:
1.51 matthew 319: #
1.1 harris41 320: # And maintain the population.
321: while (1) {
322: sleep; # wait for a signal (i.e., child's death)
1.51 matthew 323: for (my $i = $children; $i < $PREFORK; $i++) {
1.2 harris41 324: make_new_child(); # top up the child pool
1.1 harris41 325: }
326: }
327:
1.51 matthew 328: ########################################################
329: ########################################################
330:
331: =pod
332:
333: =item &make_new_child
334:
335: Inputs: None
336:
337: Returns: None
338:
339: =cut
1.2 harris41 340:
1.51 matthew 341: ########################################################
342: ########################################################
1.1 harris41 343: sub make_new_child {
344: my $pid;
345: my $sigset;
1.51 matthew 346: #
1.1 harris41 347: # block signal for fork
348: $sigset = POSIX::SigSet->new(SIGINT);
349: sigprocmask(SIG_BLOCK, $sigset)
350: or die "Can't block SIGINT for fork: $!\n";
1.51 matthew 351: #
1.2 harris41 352: die "fork: $!" unless defined ($pid = fork);
1.51 matthew 353: #
1.1 harris41 354: if ($pid) {
355: # Parent records the child's birth and returns.
356: sigprocmask(SIG_UNBLOCK, $sigset)
357: or die "Can't unblock SIGINT for fork: $!\n";
358: $children{$pid} = 1;
359: $children++;
360: return;
361: } else {
1.2 harris41 362: # Child can *not* return from this subroutine.
1.1 harris41 363: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
364: # unblock signals
365: sigprocmask(SIG_UNBLOCK, $sigset)
366: or die "Can't unblock SIGINT for fork: $!\n";
1.2 harris41 367: #open database handle
368: # making dbh global to avoid garbage collector
1.51 matthew 369: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
370: $perlvar{'lonSqlAccess'},
371: { RaiseError =>0,PrintError=>0})) {
372: sleep(10+int(rand(20)));
1.59 albertel 373: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
1.51 matthew 374: ": $@</font>");
375: # "($st secs): $@</font>");
376: print "database handle error\n";
377: exit;
378: }
379: # make sure that a database disconnection occurs with
380: # ending kill signals
1.2 harris41 381: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
1.1 harris41 382: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
1.51 matthew 383: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
384: my $client = $server->accept() or last;
1.2 harris41 385: # do something with the connection
1.1 harris41 386: $run = $run+1;
1.2 harris41 387: my $userinput = <$client>;
388: chomp($userinput);
1.51 matthew 389: #
1.45 www 390: my ($conserver,$query,
391: $arg1,$arg2,$arg3)=split(/&/,$userinput);
392: my $query=unescape($query);
1.51 matthew 393: #
1.2 harris41 394: #send query id which is pid_unixdatetime_runningcounter
1.51 matthew 395: my $queryid = $thisserver;
1.2 harris41 396: $queryid .="_".($$)."_";
397: $queryid .= time."_";
398: $queryid .= $run;
399: print $client "$queryid\n";
1.51 matthew 400: #
1.61 matthew 401: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
1.25 harris41 402: sleep 1;
1.51 matthew 403: #
1.45 www 404: my $result='';
1.51 matthew 405: #
406: # At this point, query is received, query-ID assigned and sent
407: # back, $query eq 'logquery' will mean that this is a query
408: # against log-files
409: if (($query eq 'userlog') || ($query eq 'courselog')) {
410: # beginning of log query
411: my $udom = &unescape($arg1);
412: my $uname = &unescape($arg2);
413: my $command = &unescape($arg3);
414: my $path = &propath($udom,$uname);
415: if (-e "$path/activity.log") {
416: if ($query eq 'userlog') {
417: $result=&userlog($path,$command);
418: } else {
419: $result=&courselog($path,$command);
420: }
421: } else {
422: &logthis('Unable to do log query: '.$uname.'@'.$udom);
423: $result='no_such_file';
424: }
425: # end of log query
1.70 raeburn 426: } elsif (($query eq 'fetchenrollment') ||
1.71 albertel 427: ($query eq 'institutionalphotos')) {
1.62 raeburn 428: # retrieve institutional class lists
429: my $dom = &unescape($arg1);
430: my %affiliates = ();
431: my %replies = ();
432: my $locresult = '';
433: my $querystr = &unescape($arg3);
434: foreach (split/%%/,$querystr) {
1.68 raeburn 435: if (/^([^=]+)=([^=]+)$/) {
1.62 raeburn 436: @{$affiliates{$1}} = split/,/,$2;
437: }
438: }
1.70 raeburn 439: if ($query eq 'fetchenrollment') {
440: $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
441: } elsif ($query eq 'institutionalphotos') {
442: my $crs = &unescape($arg2);
1.71.2.1! albertel 443: eval {
! 444: local($SIG{__DIE__})='DEFAULT';
! 445: $locresult = &localenroll::institutional_photos($dom,$crs,\%affiliates,\%replies,'update');
! 446: };
! 447: if ($@) {
! 448: $locresult = 'error';
! 449: }
1.70 raeburn 450: }
1.62 raeburn 451: $result = &escape($locresult.':');
452: if ($locresult) {
453: $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
454: }
1.63 matthew 455: } elsif ($query eq 'prepare activity log') {
456: my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
1.64 matthew 457: &logthis('preparing activity log tables for '.$cid);
1.63 matthew 458: my $command =
1.64 matthew 459: qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
1.63 matthew 460: system($command);
1.64 matthew 461: &logthis($command);
1.63 matthew 462: my $returnvalue = $?>>8;
463: if ($returnvalue) {
464: $result = 'error: parse_activity_log.pl returned '.
465: $returnvalue;
466: } else {
467: $result = 'success';
468: }
1.51 matthew 469: } else {
470: # Do an sql query
471: $result = &do_sql_query($query,$arg1,$arg2);
472: }
1.50 matthew 473: # result does not need to be escaped because it has already been
474: # escaped.
475: #$result=&escape($result);
1.17 harris41 476: &reply("queryreply:$queryid:$result",$conserver);
1.1 harris41 477: }
478: # tidy up gracefully and finish
1.51 matthew 479: #
480: # close the database handle
1.2 harris41 481: $dbh->disconnect
1.59 albertel 482: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
1.51 matthew 483: " from database $DBI::errstr : $@</font>");
1.1 harris41 484: # this exit is VERY important, otherwise the child will become
485: # a producer of more and more children, forking yourself into
486: # process death.
487: exit;
488: }
1.2 harris41 489: }
1.1 harris41 490:
1.51 matthew 491: ########################################################
492: ########################################################
493:
494: =pod
495:
496: =item &do_sql_query
497:
498: Runs an sql metadata table query.
499:
500: Inputs: $query, $custom, $customshow
501:
502: Returns: A string containing escaped results.
503:
504: =cut
505:
506: ########################################################
507: ########################################################
508: {
509: my @metalist;
510:
511: sub process_file {
512: if ( -e $_ && # file exists
513: -f $_ && # and is a normal file
514: /\.meta$/ && # ends in meta
515: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
516: ) {
517: push(@metalist,$File::Find::name);
518: }
519: }
520:
521: sub do_sql_query {
522: my ($query,$custom,$customshow) = @_;
1.69 www 523: # &logthis('doing query '.$query);
1.51 matthew 524: $custom = &unescape($custom);
525: $customshow = &unescape($customshow);
526: #
527: @metalist = ();
528: #
529: my $result = '';
530: my @results = ();
531: my @files;
532: my $subsetflag=0;
533: #
534: if ($query) {
535: #prepare and execute the query
536: my $sth = $dbh->prepare($query);
537: unless ($sth->execute()) {
1.59 albertel 538: &logthis('<font color="blue">'.
1.58 matthew 539: 'WARNING: Could not retrieve from database:'.
540: $sth->errstr().'</font>');
1.51 matthew 541: } else {
542: my $aref=$sth->fetchall_arrayref;
543: foreach my $row (@$aref) {
544: push @files,@{$row}[3] if ($custom or $customshow);
545: my @b=map { &escape($_); } @$row;
546: push @results,join(",", @b);
547: # Build up the @files array with the LON-CAPA urls
548: # of the resources.
549: }
550: }
551: }
552: # do custom metadata searching here and build into result
553: return join("&",@results) if (! ($custom or $customshow));
554: # Only get here if there is a custom query or custom show request
555: &logthis("Doing custom query for $custom");
556: if ($query) {
557: @metalist=map {
558: $perlvar{'lonDocRoot'}.$_.'.meta';
559: } @files;
560: } else {
561: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
562: @metalist=();
563: opendir(RESOURCES,$dir);
564: my @homeusers=grep {
565: &ishome($dir.'/'.$_);
566: } grep {!/^\.\.?$/} readdir(RESOURCES);
567: closedir RESOURCES;
568: # Define the
569: foreach my $user (@homeusers) {
570: find (\&process_file,$dir.'/'.$user);
571: }
572: }
573: # if file is indicated in sql database and
574: # not part of sql-relevant query, do not pattern match.
575: #
576: # if file is not in sql database, output error.
577: #
578: # if file is indicated in sql database and is
579: # part of query result list, then do the pattern match.
580: my $customresult='';
581: my @results;
582: foreach my $metafile (@metalist) {
583: my $fh=IO::File->new($metafile);
584: my @lines=<$fh>;
585: my $stuff=join('',@lines);
586: if ($stuff=~/$custom/s) {
587: foreach my $f ('abstract','author','copyright',
588: 'creationdate','keywords','language',
589: 'lastrevisiondate','mime','notes',
590: 'owner','subject','title') {
591: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
592: }
593: my $mfile=$metafile;
594: my $docroot=$perlvar{'lonDocRoot'};
595: $mfile=~s/^$docroot//;
596: $mfile=~s/\.meta$//;
597: unless ($query) {
598: my $q2="SELECT * FROM metadata WHERE url ".
599: " LIKE BINARY '?'";
600: my $sth = $dbh->prepare($q2);
601: $sth->execute($mfile);
602: my $aref=$sth->fetchall_arrayref;
603: foreach my $a (@$aref) {
604: my @b=map { &escape($_)} @$a;
605: push @results,join(",", @b);
606: }
607: }
608: # &logthis("found: $stuff");
609: $customresult.='&custom='.&escape($mfile).','.
610: escape($stuff);
611: }
612: }
613: $result=join("&",@results) unless $query;
614: $result.=$customresult;
615: #
616: return $result;
617: } # End of &do_sql_query
618:
619: } # End of scoping curly braces for &process_file and &do_sql_query
620: ########################################################
621: ########################################################
622:
623: =pod
624:
625: =item &logthis
626:
627: Inputs: $message, the message to log
628:
629: Returns: nothing
630:
631: Writes $message to the logfile.
632:
633: =cut
634:
635: ########################################################
636: ########################################################
637: sub logthis {
638: my $message=shift;
639: my $execdir=$perlvar{'lonDaemons'};
1.52 matthew 640: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
1.51 matthew 641: my $now=time;
642: my $local=localtime($now);
643: print $fh "$local ($$): $message\n";
1.2 harris41 644: }
1.1 harris41 645:
1.2 harris41 646: # -------------------------------------------------- Non-critical communication
1.1 harris41 647:
1.51 matthew 648: ########################################################
649: ########################################################
650:
651: =pod
652:
653: =item &subreply
654:
655: Sends a command to a server. Called only by &reply.
656:
657: Inputs: $cmd,$server
658:
659: Returns: The results of the message or 'con_lost' on error.
660:
661: =cut
662:
663: ########################################################
664: ########################################################
1.2 harris41 665: sub subreply {
666: my ($cmd,$server)=@_;
667: my $peerfile="$perlvar{'lonSockDir'}/$server";
668: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
669: Type => SOCK_STREAM,
670: Timeout => 10)
671: or return "con_lost";
672: print $sclient "$cmd\n";
673: my $answer=<$sclient>;
674: chomp($answer);
1.51 matthew 675: $answer="con_lost" if (!$answer);
1.2 harris41 676: return $answer;
677: }
1.1 harris41 678:
1.51 matthew 679: ########################################################
680: ########################################################
681:
682: =pod
683:
684: =item &reply
685:
686: Sends a command to a server.
687:
688: Inputs: $cmd,$server
689:
690: Returns: The results of the message or 'con_lost' on error.
691:
692: =cut
693:
694: ########################################################
695: ########################################################
1.2 harris41 696: sub reply {
697: my ($cmd,$server)=@_;
698: my $answer;
699: if ($server ne $perlvar{'lonHostID'}) {
700: $answer=subreply($cmd,$server);
701: if ($answer eq 'con_lost') {
702: $answer=subreply("ping",$server);
703: $answer=subreply($cmd,$server);
704: }
705: } else {
706: $answer='self_reply';
1.33 harris41 707: $answer=subreply($cmd,$server);
1.2 harris41 708: }
709: return $answer;
710: }
1.1 harris41 711:
1.51 matthew 712: ########################################################
713: ########################################################
714:
715: =pod
716:
717: =item &escape
718:
719: Escape special characters in a string.
1.3 harris41 720:
1.51 matthew 721: Inputs: string to escape
722:
723: Returns: The input string with special characters escaped.
724:
725: =cut
726:
727: ########################################################
728: ########################################################
1.3 harris41 729: sub escape {
730: my $str=shift;
731: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
732: return $str;
733: }
734:
1.51 matthew 735: ########################################################
736: ########################################################
737:
738: =pod
739:
740: =item &unescape
741:
742: Unescape special characters in a string.
1.3 harris41 743:
1.51 matthew 744: Inputs: string to unescape
745:
746: Returns: The input string with special characters unescaped.
747:
748: =cut
749:
750: ########################################################
751: ########################################################
1.3 harris41 752: sub unescape {
753: my $str=shift;
754: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
755: return $str;
756: }
1.34 harris41 757:
1.51 matthew 758: ########################################################
759: ########################################################
760:
761: =pod
762:
763: =item &ishome
764:
765: Determine if the current machine is the home server for a user.
766: The determination is made by checking the filesystem for the users information.
767:
768: Inputs: $author
769:
770: Returns: 0 - this is not the authors home server, 1 - this is.
771:
772: =cut
773:
774: ########################################################
775: ########################################################
1.34 harris41 776: sub ishome {
777: my $author=shift;
778: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
779: my ($udom,$uname)=split(/\//,$author);
780: my $proname=propath($udom,$uname);
781: if (-e $proname) {
782: return 1;
783: } else {
784: return 0;
785: }
786: }
787:
1.51 matthew 788: ########################################################
789: ########################################################
790:
791: =pod
792:
793: =item &propath
794:
795: Inputs: user name, user domain
796:
797: Returns: The full path to the users directory.
798:
799: =cut
800:
801: ########################################################
802: ########################################################
1.34 harris41 803: sub propath {
804: my ($udom,$uname)=@_;
805: $udom=~s/\W//g;
806: $uname=~s/\W//g;
807: my $subdir=$uname.'__';
808: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
809: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
810: return $proname;
811: }
1.40 harris41 812:
1.51 matthew 813: ########################################################
814: ########################################################
815:
816: =pod
817:
818: =item &courselog
819:
820: Inputs: $path, $command
821:
822: Returns: unescaped string of values.
823:
824: =cut
825:
826: ########################################################
827: ########################################################
828: sub courselog {
829: my ($path,$command)=@_;
830: my %filters=();
831: foreach (split(/\:/,&unescape($command))) {
832: my ($name,$value)=split(/\=/,$_);
833: $filters{$name}=$value;
834: }
835: my @results=();
836: open(IN,$path.'/activity.log') or return ('file_error');
837: while (my $line=<IN>) {
838: chomp($line);
839: my ($timestamp,$host,$log)=split(/\:/,$line);
840: #
841: # $log has the actual log entries; currently still escaped, and
842: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
843: # then additionally
844: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
845: # or
846: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
847: #
848: # get delimiter between timestamped entries to be &&&
849: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
850: # now go over all log entries
851: foreach (split(/\&\&\&/,&unescape($log))) {
852: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
853: my $values=&unescape(join(':',@values));
854: $values=~s/\&/\:/g;
855: $res=&unescape($res);
856: my $include=1;
857: if (($filters{'username'}) && ($uname ne $filters{'username'}))
858: { $include=0; }
859: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
860: { $include=0; }
861: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
862: { $include=0; }
863: if (($filters{'start'}) && ($time<$filters{'start'}))
864: { $include=0; }
865: if (($filters{'end'}) && ($time>$filters{'end'}))
866: { $include=0; }
867: if (($filters{'action'} eq 'view') && ($action))
868: { $include=0; }
869: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
870: { $include=0; }
871: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
872: { $include=0; }
873: if ($include) {
874: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
875: $uname.':'.$udom.':'.
876: $action.':'.$values);
877: }
878: }
879: }
880: close IN;
881: return join('&',sort(@results));
882: }
883:
884: ########################################################
885: ########################################################
886:
887: =pod
888:
889: =item &userlog
890:
891: Inputs: $path, $command
892:
893: Returns: unescaped string of values.
1.40 harris41 894:
1.51 matthew 895: =cut
1.40 harris41 896:
1.51 matthew 897: ########################################################
898: ########################################################
899: sub userlog {
900: my ($path,$command)=@_;
901: my %filters=();
902: foreach (split(/\:/,&unescape($command))) {
903: my ($name,$value)=split(/\=/,$_);
904: $filters{$name}=$value;
905: }
906: my @results=();
907: open(IN,$path.'/activity.log') or return ('file_error');
908: while (my $line=<IN>) {
909: chomp($line);
910: my ($timestamp,$host,$log)=split(/\:/,$line);
911: $log=&unescape($log);
912: my $include=1;
913: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
914: { $include=0; }
915: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
916: { $include=0; }
917: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
918: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
919: { $include=0; }
920: if ($include) {
921: push(@results,$timestamp.':'.$log);
922: }
923: }
924: close IN;
925: return join('&',sort(@results));
1.52 matthew 926: }
927:
928: ########################################################
929: ########################################################
930:
931: =pod
932:
933: =item Functions required for forking
934:
935: =over 4
936:
937: =item REAPER
938:
939: REAPER takes care of dead children.
940:
941: =item HUNTSMAN
942:
943: Signal handler for SIGINT.
944:
945: =item HUPSMAN
946:
947: Signal handler for SIGHUP
948:
949: =item DISCONNECT
950:
951: Disconnects from database.
952:
953: =back
954:
955: =cut
956:
957: ########################################################
958: ########################################################
959: sub REAPER { # takes care of dead children
960: $SIG{CHLD} = \&REAPER;
961: my $pid = wait;
962: $children --;
963: &logthis("Child $pid died");
964: delete $children{$pid};
965: }
966:
967: sub HUNTSMAN { # signal handler for SIGINT
968: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
969: kill 'INT' => keys %children;
970: my $execdir=$perlvar{'lonDaemons'};
971: unlink("$execdir/logs/lonsql.pid");
1.59 albertel 972: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.52 matthew 973: $unixsock = "mysqlsock";
974: my $port="$perlvar{'lonSockDir'}/$unixsock";
975: unlink($port);
976: exit; # clean up with dignity
977: }
978:
979: sub HUPSMAN { # signal handler for SIGHUP
980: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
981: kill 'INT' => keys %children;
982: close($server); # free up socket
1.59 albertel 983: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.52 matthew 984: my $execdir=$perlvar{'lonDaemons'};
985: $unixsock = "mysqlsock";
986: my $port="$perlvar{'lonSockDir'}/$unixsock";
987: unlink($port);
988: exec("$execdir/lonsql"); # here we go again
989: }
990:
991: sub DISCONNECT {
992: $dbh->disconnect or
1.59 albertel 993: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
1.52 matthew 994: " $DBI::errstr : $@</font>");
995: exit;
1.51 matthew 996: }
1.40 harris41 997:
998:
1.51 matthew 999: =pod
1.40 harris41 1000:
1.51 matthew 1001: =back
1.40 harris41 1002:
1003: =cut
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