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 1.81 2007/04/12 00:00:55 albertel 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;
106: use LONCAPA::Configuration;
107: use LONCAPA::lonmetadata();
108: use Apache::lonnet;
109:
110: use IO::Socket;
111: use Symbol;
112: use POSIX;
113: use IO::Select;
114: use DBI;
115: use File::Find;
116: use localenroll;
117: use GDBM_File;
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 %perlvar=%{&LONCAPA::Configuration::read_conf('loncapa.conf')};
206: #
207: # Write the /home/www/.my.cnf file
208: my $conf_file = '/home/www/.my.cnf';
209: if (! -e $conf_file) {
210: if (open MYCNF, ">$conf_file") {
211: print MYCNF <<"ENDMYCNF";
212: [client]
213: user=www
214: password=$perlvar{'lonSqlAccess'}
215: ENDMYCNF
216: close MYCNF;
217: } else {
218: warn "Unable to write $conf_file, continuing";
219: }
220: }
221:
222:
223: #
224: # Make sure that database can be accessed
225: #
226: my $dbh;
227: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
228: $perlvar{'lonSqlAccess'},
229: { RaiseError =>0,PrintError=>0})) {
230: print "Cannot connect to database!\n";
231: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
232: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
233: system("echo 'Cannot connect to MySQL database!' |".
234: " mailto $emailto -s '$subj' > /dev/null");
235:
236: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
237: print SMP 'time='.time.'&mysql=defunct'."\n";
238: close(SMP);
239:
240: exit 1;
241: } else {
242: unlink('/home/httpd/html/lon-status/mysql.txt');
243: $dbh->disconnect;
244: }
245:
246: #
247: # Check if other instance running
248: #
249: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
250: if (-e $pidfile) {
251: open(my $lfh,"$pidfile");
252: my $pide=<$lfh>;
253: chomp($pide);
254: if (kill 0 => $pide) { die "already running"; }
255: }
256:
257: my $PREFORK=4; # number of children to maintain, at least four spare
258: #
259: #$PREFORK=int($PREFORK/4);
260:
261: #
262: # Create a socket to talk to lond
263: #
264: my $unixsock = "mysqlsock";
265: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
266: my $server;
267: unlink ($localfile);
268: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
269: Type => SOCK_STREAM,
270: Listen => 10)) {
271: print "in socket error:$@\n";
272: }
273:
274: #
275: # Fork once and dissociate
276: #
277: my $fpid=fork;
278: exit if $fpid;
279: die "Couldn't fork: $!" unless defined ($fpid);
280: POSIX::setsid() or die "Can't start new session: $!";
281:
282: #
283: # Write our PID on disk
284: my $execdir=$perlvar{'lonDaemons'};
285: open (PIDSAVE,">$execdir/logs/lonsql.pid");
286: print PIDSAVE "$$\n";
287: close(PIDSAVE);
288: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
289:
290: #
291: # Ignore signals generated during initial startup
292: $SIG{HUP}=$SIG{USR1}='IGNORE';
293: # Now we are on our own
294: # Fork off our children.
295: for (1 .. $PREFORK) {
296: make_new_child();
297: }
298:
299: #
300: # Install signal handlers.
301: $SIG{CHLD} = \&REAPER;
302: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
303: $SIG{HUP} = \&HUPSMAN;
304:
305: #
306: # And maintain the population.
307: while (1) {
308: sleep; # wait for a signal (i.e., child's death)
309: for (my $i = $children; $i < $PREFORK; $i++) {
310: make_new_child(); # top up the child pool
311: }
312: }
313:
314: ########################################################
315: ########################################################
316:
317: =pod
318:
319: =item &make_new_child
320:
321: Inputs: None
322:
323: Returns: None
324:
325: =cut
326:
327: ########################################################
328: ########################################################
329: sub make_new_child {
330: my $pid;
331: my $sigset;
332: #
333: # block signal for fork
334: $sigset = POSIX::SigSet->new(SIGINT);
335: sigprocmask(SIG_BLOCK, $sigset)
336: or die "Can't block SIGINT for fork: $!\n";
337: #
338: die "fork: $!" unless defined ($pid = fork);
339: #
340: if ($pid) {
341: # Parent records the child's birth and returns.
342: sigprocmask(SIG_UNBLOCK, $sigset)
343: or die "Can't unblock SIGINT for fork: $!\n";
344: $children{$pid} = 1;
345: $children++;
346: return;
347: } else {
348: # Child can *not* return from this subroutine.
349: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
350: # unblock signals
351: sigprocmask(SIG_UNBLOCK, $sigset)
352: or die "Can't unblock SIGINT for fork: $!\n";
353: #open database handle
354: # making dbh global to avoid garbage collector
355: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
356: $perlvar{'lonSqlAccess'},
357: { RaiseError =>0,PrintError=>0})) {
358: sleep(10+int(rand(20)));
359: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
360: ": $@</font>");
361: # "($st secs): $@</font>");
362: print "database handle error\n";
363: exit;
364: }
365: # make sure that a database disconnection occurs with
366: # ending kill signals
367: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
368: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
369: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
370: my $client = $server->accept() or last;
371: # do something with the connection
372: $run = $run+1;
373: my $userinput = <$client>;
374: chomp($userinput);
375: $userinput=~s/\:(\w+)$//;
376: my $searchdomain=$1;
377: #
378: my ($conserver,$query,
379: $arg1,$arg2,$arg3)=split(/&/,$userinput);
380: my $query=unescape($query);
381: #
382: #send query id which is pid_unixdatetime_runningcounter
383: my $queryid = &Apache::lonnet::hostname($perlvar{'lonHostID'});
384: $queryid .="_".($$)."_";
385: $queryid .= time."_";
386: $queryid .= $run;
387: print $client "$queryid\n";
388: #
389: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3 - $queryid");
390: sleep 1;
391: #
392: my $result='';
393: #
394: # At this point, query is received, query-ID assigned and sent
395: # back, $query eq 'logquery' will mean that this is a query
396: # against log-files
397: if (($query eq 'userlog') || ($query eq 'courselog')) {
398: # beginning of log query
399: my $udom = &unescape($arg1);
400: my $uname = &unescape($arg2);
401: my $command = &unescape($arg3);
402: my $path = &propath($udom,$uname);
403: if (-e "$path/activity.log") {
404: if ($query eq 'userlog') {
405: $result=&userlog($path,$command);
406: } else {
407: $result=&courselog($path,$command);
408: }
409: $result = &escape($result);
410: } else {
411: &logthis('Unable to do log query: '.$uname.'@'.$udom);
412: $result='no_such_file';
413: }
414: # end of log query
415: } elsif (($query eq 'fetchenrollment') ||
416: ($query eq 'institutionalphotos')) {
417: # retrieve institutional class lists
418: my $dom = &unescape($arg1);
419: my %affiliates = ();
420: my %replies = ();
421: my $locresult = '';
422: my $querystr = &unescape($arg3);
423: foreach (split/%%/,$querystr) {
424: if (/^([^=]+)=([^=]+)$/) {
425: @{$affiliates{$1}} = split/,/,$2;
426: }
427: }
428: if ($query eq 'fetchenrollment') {
429: $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
430: } elsif ($query eq 'institutionalphotos') {
431: my $crs = &unescape($arg2);
432: eval {
433: local($SIG{__DIE__})='DEFAULT';
434: $locresult = &localenroll::institutional_photos($dom,$crs,\%affiliates,\%replies,'update');
435: };
436: if ($@) {
437: $locresult = 'error';
438: }
439: }
440: $result = &escape($locresult.':');
441: if ($locresult) {
442: $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
443: }
444: } elsif ($query eq 'prepare activity log') {
445: my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
446: &logthis('preparing activity log tables for '.$cid);
447: my $command =
448: qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
449: system($command);
450: &logthis($command);
451: my $returnvalue = $?>>8;
452: if ($returnvalue) {
453: $result = 'error: parse_activity_log.pl returned '.
454: $returnvalue;
455: } else {
456: $result = 'success';
457: }
458: } elsif (($query eq 'portfolio_metadata') ||
459: ($query eq 'portfolio_access')) {
460: $result = &portfolio_table_update($query,$arg1,$arg2,
461: $arg3);
462: } else {
463: # Do an sql query
464: $result = &do_sql_query($query,$arg1,$arg2,$searchdomain);
465: }
466: # result does not need to be escaped because it has already been
467: # escaped.
468: #$result=&escape($result);
469: &Apache::lonnet::reply("queryreply:$queryid:$result",$conserver);
470: }
471: # tidy up gracefully and finish
472: #
473: # close the database handle
474: $dbh->disconnect
475: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
476: " from database $DBI::errstr : $@</font>");
477: # this exit is VERY important, otherwise the child will become
478: # a producer of more and more children, forking yourself into
479: # process death.
480: exit;
481: }
482: }
483:
484: ########################################################
485: ########################################################
486:
487: =pod
488:
489: =item &do_sql_query
490:
491: Runs an sql metadata table query.
492:
493: Inputs: $query, $custom, $customshow
494:
495: Returns: A string containing escaped results.
496:
497: =cut
498:
499: ########################################################
500: ########################################################
501: {
502: my @metalist;
503:
504: sub process_file {
505: if ( -e $_ && # file exists
506: -f $_ && # and is a normal file
507: /\.meta$/ && # ends in meta
508: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
509: ) {
510: push(@metalist,$File::Find::name);
511: }
512: }
513:
514: sub do_sql_query {
515: my ($query,$custom,$customshow,$searchdomain) = @_;
516:
517: #
518: # limit to searchdomain if given and table is metadata
519: #
520: if (($searchdomain) && ($query=~/FROM metadata/)) {
521: $query.=' HAVING (domain="'.$searchdomain.'")';
522: }
523: # &logthis('doing query ('.$searchdomain.')'.$query);
524:
525:
526:
527: $custom = &unescape($custom);
528: $customshow = &unescape($customshow);
529: #
530: @metalist = ();
531: #
532: my $result = '';
533: my @results = ();
534: my @files;
535: my $subsetflag=0;
536: #
537: if ($query) {
538: #prepare and execute the query
539: my $sth = $dbh->prepare($query);
540: unless ($sth->execute()) {
541: &logthis('<font color="blue">'.
542: 'WARNING: Could not retrieve from database:'.
543: $sth->errstr().'</font>');
544: } else {
545: my $aref=$sth->fetchall_arrayref;
546: foreach my $row (@$aref) {
547: push @files,@{$row}[3] if ($custom or $customshow);
548: my @b=map { &escape($_); } @$row;
549: push @results,join(",", @b);
550: # Build up the @files array with the LON-CAPA urls
551: # of the resources.
552: }
553: }
554: }
555: # do custom metadata searching here and build into result
556: return join("&",@results) if (! ($custom or $customshow));
557: # Only get here if there is a custom query or custom show request
558: &logthis("Doing custom query for $custom");
559: if ($query) {
560: @metalist=map {
561: $perlvar{'lonDocRoot'}.$_.'.meta';
562: } @files;
563: } else {
564: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
565: @metalist=();
566: opendir(RESOURCES,$dir);
567: my @homeusers=grep {
568: &ishome($dir.'/'.$_);
569: } grep {!/^\.\.?$/} readdir(RESOURCES);
570: closedir RESOURCES;
571: # Define the
572: foreach my $user (@homeusers) {
573: find (\&process_file,$dir.'/'.$user);
574: }
575: }
576: # if file is indicated in sql database and
577: # not part of sql-relevant query, do not pattern match.
578: #
579: # if file is not in sql database, output error.
580: #
581: # if file is indicated in sql database and is
582: # part of query result list, then do the pattern match.
583: my $customresult='';
584: my @results;
585: foreach my $metafile (@metalist) {
586: open(my $fh,$metafile);
587: my @lines=<$fh>;
588: my $stuff=join('',@lines);
589: if ($stuff=~/$custom/s) {
590: foreach my $f ('abstract','author','copyright',
591: 'creationdate','keywords','language',
592: 'lastrevisiondate','mime','notes',
593: 'owner','subject','title') {
594: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
595: }
596: my $mfile=$metafile;
597: my $docroot=$perlvar{'lonDocRoot'};
598: $mfile=~s/^$docroot//;
599: $mfile=~s/\.meta$//;
600: unless ($query) {
601: my $q2="SELECT * FROM metadata WHERE url ".
602: " LIKE BINARY '?'";
603: my $sth = $dbh->prepare($q2);
604: $sth->execute($mfile);
605: my $aref=$sth->fetchall_arrayref;
606: foreach my $a (@$aref) {
607: my @b=map { &escape($_)} @$a;
608: push @results,join(",", @b);
609: }
610: }
611: # &logthis("found: $stuff");
612: $customresult.='&custom='.&escape($mfile).','.
613: escape($stuff);
614: }
615: }
616: $result=join("&",@results) unless $query;
617: $result.=$customresult;
618: #
619: return $result;
620: } # End of &do_sql_query
621:
622: } # End of scoping curly braces for &process_file and &do_sql_query
623:
624: sub portfolio_table_update {
625: my ($query,$arg1,$arg2,$arg3) = @_;
626: my %tablenames = (
627: 'portfolio' => 'portfolio_metadata',
628: 'access' => 'portfolio_access',
629: 'addedfields' => 'portfolio_addedfields',
630: );
631: my $result = 'ok';
632: my $tablechk = &check_table($query);
633: if ($tablechk == 0) {
634: my $request =
635: &LONCAPA::lonmetadata::create_metadata_storage($query,$query);
636: $dbh->do($request);
637: if ($dbh->err) {
638: &logthis("create $query".
639: " ERROR: ".$dbh->errstr);
640: $result = 'error';
641: }
642: }
643: if ($result eq 'ok') {
644: my ($uname,$udom,$group) = split(/:/,&unescape($arg1));
645: my $file_name = &unescape($arg2);
646: my $action = $arg3;
647: my $is_course = 0;
648: if ($group ne '') {
649: $is_course = 1;
650: }
651: my $urlstart = '/uploaded/'.$udom.'/'.$uname;
652: my $pathstart = &propath($udom,$uname).'/userfiles';
653: my ($fullpath,$url);
654: if ($is_course) {
655: $fullpath = $pathstart.'/groups/'.$group.'/portfolio'.
656: $file_name;
657: $url = $urlstart.'/groups/'.$group.'/portfolio'.$file_name;
658: } else {
659: $fullpath = $pathstart.'/portfolio'.$file_name;
660: $url = $urlstart.'/portfolio'.$file_name;
661: }
662: if ($query eq 'portfolio_metadata') {
663: if ($action eq 'delete') {
664: my %loghash = &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,\%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group,'update');
665: } elsif (-e $fullpath.'.meta') {
666: my %loghash = &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,\%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group,'update');
667: if (keys(%loghash) > 0) {
668: &portfolio_logging(%loghash);
669: }
670: }
671: } elsif ($query eq 'portfolio_access') {
672: my %access = &get_access_hash($uname,$udom,$group.$file_name);
673: my %loghash =
674: &LONCAPA::lonmetadata::process_portfolio_access_data($dbh,undef,
675: \%tablenames,$url,$fullpath,\%access,'update');
676: if (keys(%loghash) > 0) {
677: &portfolio_logging(%loghash);
678: } else {
679: my $available = 0;
680: foreach my $key (keys(%access)) {
681: my ($num,$scope,$end,$start) =
682: ($key =~ /^([^:]+):([a-z]+)_(\d*)_?(\d*)$/);
683: if ($scope eq 'public' || $scope eq 'guest') {
684: $available = 1;
685: last;
686: }
687: }
688: if ($available) {
689: # Retrieve current values
690: my $condition = 'url='.$dbh->quote("$url");
691: my ($error,$row) =
692: &LONCAPA::lonmetadata::lookup_metadata($dbh,$condition,undef,
693: 'portfolio_metadata');
694: if (!$error) {
695: if (!(ref($row->[0]) eq 'ARRAY')) {
696: my %loghash =
697: &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,
698: \%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group);
699: if (keys(%loghash) > 0) {
700: &portfolio_logging(%loghash);
701: }
702: }
703: }
704: }
705: }
706: }
707: }
708: return $result;
709: }
710:
711: sub get_access_hash {
712: my ($uname,$udom,$file) = @_;
713: my $hashref = &tie_user_hash($udom,$uname,'file_permissions',
714: &GDBM_READER());
715: my %curr_perms;
716: my %access;
717: if ($hashref) {
718: while (my ($key,$value) = each(%$hashref)) {
719: $key = &unescape($key);
720: next if ($key =~ /^error: 2 /);
721: $curr_perms{$key}=&Apache::lonnet::thaw_unescape($value);
722: }
723: if (!&untie_user_hash($hashref)) {
724: &logthis("error: ".($!+0)." untie (GDBM) Failed");
725: }
726: } else {
727: &logthis("error: ".($!+0)." tie (GDBM) Failed");
728: }
729: if (keys(%curr_perms) > 0) {
730: if (ref($curr_perms{$file."\0".'accesscontrol'}) eq 'HASH') {
731: foreach my $acl (keys(%{$curr_perms{$file."\0".'accesscontrol'}})) {
732: $access{$acl} = $curr_perms{$file."\0".$acl};
733: }
734: }
735: }
736: return %access;
737: }
738:
739: ###########################################
740: sub check_table {
741: my ($table_id) = @_;
742: my $sth=$dbh->prepare('SHOW TABLES');
743: $sth->execute();
744: my $aref = $sth->fetchall_arrayref;
745: $sth->finish();
746: if ($sth->err()) {
747: &logthis("fetchall_arrayref after SHOW TABLES".
748: " ERROR: ".$sth->errstr);
749: return undef;
750: }
751: my $result = 0;
752: foreach my $table (@{$aref}) {
753: if ($table->[0] eq $table_id) {
754: $result = 1;
755: last;
756: }
757: }
758: return $result;
759: }
760:
761: ###########################################
762:
763: sub portfolio_logging {
764: my (%portlog) = @_;
765: foreach my $key (keys(%portlog)) {
766: if (ref($portlog{$key}) eq 'HASH') {
767: foreach my $item (keys(%{$portlog{$key}})) {
768: &logthis($portlog{$key}{$item});
769: }
770: }
771: }
772: }
773:
774:
775: ########################################################
776: ########################################################
777:
778: =pod
779:
780: =item &logthis
781:
782: Inputs: $message, the message to log
783:
784: Returns: nothing
785:
786: Writes $message to the logfile.
787:
788: =cut
789:
790: ########################################################
791: ########################################################
792: sub logthis {
793: my $message=shift;
794: my $execdir=$perlvar{'lonDaemons'};
795: open(my $fh,">>$execdir/logs/lonsql.log");
796: my $now=time;
797: my $local=localtime($now);
798: print $fh "$local ($$): $message\n";
799: }
800:
801: ########################################################
802: ########################################################
803:
804: =pod
805:
806: =item &ishome
807:
808: Determine if the current machine is the home server for a user.
809: The determination is made by checking the filesystem for the users information.
810:
811: Inputs: $author
812:
813: Returns: 0 - this is not the authors home server, 1 - this is.
814:
815: =cut
816:
817: ########################################################
818: ########################################################
819: sub ishome {
820: my $author=shift;
821: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
822: my ($udom,$uname)=split(/\//,$author);
823: my $proname=propath($udom,$uname);
824: if (-e $proname) {
825: return 1;
826: } else {
827: return 0;
828: }
829: }
830:
831: ########################################################
832: ########################################################
833:
834: =pod
835:
836: =item &courselog
837:
838: Inputs: $path, $command
839:
840: Returns: unescaped string of values.
841:
842: =cut
843:
844: ########################################################
845: ########################################################
846: sub courselog {
847: my ($path,$command)=@_;
848: my %filters=();
849: foreach (split(/\:/,&unescape($command))) {
850: my ($name,$value)=split(/\=/,$_);
851: $filters{$name}=$value;
852: }
853: my @results=();
854: open(IN,$path.'/activity.log') or return ('file_error');
855: while (my $line=<IN>) {
856: chomp($line);
857: my ($timestamp,$host,$log)=split(/\:/,$line);
858: #
859: # $log has the actual log entries; currently still escaped, and
860: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
861: # then additionally
862: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
863: # or
864: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
865: #
866: # get delimiter between timestamped entries to be &&&
867: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
868: # now go over all log entries
869: foreach (split(/\&\&\&/,&unescape($log))) {
870: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
871: my $values=&unescape(join(':',@values));
872: $values=~s/\&/\:/g;
873: $res=&unescape($res);
874: my $include=1;
875: if (($filters{'username'}) && ($uname ne $filters{'username'}))
876: { $include=0; }
877: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
878: { $include=0; }
879: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
880: { $include=0; }
881: if (($filters{'start'}) && ($time<$filters{'start'}))
882: { $include=0; }
883: if (($filters{'end'}) && ($time>$filters{'end'}))
884: { $include=0; }
885: if (($filters{'action'} eq 'view') && ($action))
886: { $include=0; }
887: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
888: { $include=0; }
889: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
890: { $include=0; }
891: if ($include) {
892: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
893: $uname.':'.$udom.':'.
894: $action.':'.$values);
895: }
896: }
897: }
898: close IN;
899: return join('&',sort(@results));
900: }
901:
902: ########################################################
903: ########################################################
904:
905: =pod
906:
907: =item &userlog
908:
909: Inputs: $path, $command
910:
911: Returns: unescaped string of values.
912:
913: =cut
914:
915: ########################################################
916: ########################################################
917: sub userlog {
918: my ($path,$command)=@_;
919: my %filters=();
920: foreach (split(/\:/,&unescape($command))) {
921: my ($name,$value)=split(/\=/,$_);
922: $filters{$name}=$value;
923: }
924: my @results=();
925: open(IN,$path.'/activity.log') or return ('file_error');
926: while (my $line=<IN>) {
927: chomp($line);
928: my ($timestamp,$host,$log)=split(/\:/,$line);
929: $log=&unescape($log);
930: my $include=1;
931: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
932: { $include=0; }
933: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
934: { $include=0; }
935: if (($filters{'action'} eq 'Role') && ($log !~/^Role/))
936: { $include=0; }
937: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
938: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
939: { $include=0; }
940: if ($include) {
941: push(@results,$timestamp.':'.$host.':'.&escape($log));
942: }
943: }
944: close IN;
945: return join('&',sort(@results));
946: }
947:
948: ########################################################
949: ########################################################
950:
951: =pod
952:
953: =item Functions required for forking
954:
955: =over 4
956:
957: =item REAPER
958:
959: REAPER takes care of dead children.
960:
961: =item HUNTSMAN
962:
963: Signal handler for SIGINT.
964:
965: =item HUPSMAN
966:
967: Signal handler for SIGHUP
968:
969: =item DISCONNECT
970:
971: Disconnects from database.
972:
973: =back
974:
975: =cut
976:
977: ########################################################
978: ########################################################
979: sub REAPER { # takes care of dead children
980: $SIG{CHLD} = \&REAPER;
981: my $pid = wait;
982: $children --;
983: &logthis("Child $pid died");
984: delete $children{$pid};
985: }
986:
987: sub HUNTSMAN { # signal handler for SIGINT
988: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
989: kill 'INT' => keys %children;
990: my $execdir=$perlvar{'lonDaemons'};
991: unlink("$execdir/logs/lonsql.pid");
992: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
993: $unixsock = "mysqlsock";
994: my $port="$perlvar{'lonSockDir'}/$unixsock";
995: unlink($port);
996: exit; # clean up with dignity
997: }
998:
999: sub HUPSMAN { # signal handler for SIGHUP
1000: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
1001: kill 'INT' => keys %children;
1002: close($server); # free up socket
1003: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1004: my $execdir=$perlvar{'lonDaemons'};
1005: $unixsock = "mysqlsock";
1006: my $port="$perlvar{'lonSockDir'}/$unixsock";
1007: unlink($port);
1008: exec("$execdir/lonsql"); # here we go again
1009: }
1010:
1011: sub DISCONNECT {
1012: $dbh->disconnect or
1013: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
1014: " $DBI::errstr : $@</font>");
1015: exit;
1016: }
1017:
1018:
1019: =pod
1020:
1021: =back
1022:
1023: =cut
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