Annotation of loncom/lonsql, revision 1.77
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: #
1.77 ! albertel 6: # $Id: lonsql,v 1.76 2006/02/10 09:51:27 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/';
1.77 ! albertel 105: use LONCAPA;
1.42 harris41 106: use LONCAPA::Configuration;
1.58 matthew 107: use LONCAPA::lonmetadata();
1.42 harris41 108:
1.2 harris41 109: use IO::Socket;
110: use Symbol;
1.1 harris41 111: use POSIX;
112: use IO::Select;
113: use IO::File;
114: use Socket;
115: use Fcntl;
116: use Tie::RefHash;
117: use DBI;
1.51 matthew 118: use File::Find;
1.62 raeburn 119: use localenroll;
1.51 matthew 120:
121: ########################################################
122: ########################################################
123:
124: =pod
125:
126: =item Global Variables
127:
128: =over 4
129:
130: =item dbh
131:
132: =back
133:
134: =cut
135:
136: ########################################################
137: ########################################################
138: my $dbh;
139:
140: ########################################################
141: ########################################################
142:
143: =pod
144:
145: =item Variables required for forking
1.1 harris41 146:
1.51 matthew 147: =over 4
148:
149: =item $MAX_CLIENTS_PER_CHILD
150:
151: The number of clients each child should process.
152:
153: =item %children
154:
155: The keys to %children are the current child process IDs
156:
157: =item $children
158:
159: The current number of children
160:
161: =back
162:
163: =cut
1.9 harris41 164:
1.51 matthew 165: ########################################################
166: ########################################################
167: my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
168: my %children = (); # keys are current child process IDs
169: my $children = 0; # current number of children
170:
171: ###################################################################
172: ###################################################################
173:
174: =pod
175:
176: =item Main body of code.
177:
178: =over 4
1.45 www 179:
1.51 matthew 180: =item Read data from loncapa_apache.conf and loncapa.conf.
181:
182: =item Ensure we can access the database.
183:
184: =item Determine if there are other instances of lonsql running.
185:
186: =item Read the hosts file.
187:
188: =item Create a socket for lonsql.
189:
190: =item Fork once and dissociate from parent.
191:
192: =item Write PID to disk.
193:
194: =item Prefork children and maintain the population of children.
195:
196: =back
197:
198: =cut
199:
200: ###################################################################
201: ###################################################################
202: my $childmaxattempts=10;
203: my $run =0; # running counter to generate the query-id
204: #
205: # Read loncapa_apache.conf and loncapa.conf
206: #
1.53 harris41 207: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.51 matthew 208: my %perlvar=%{$perlvarref};
209: #
1.63 matthew 210: # Write the /home/www/.my.cnf file
211: my $conf_file = '/home/www/.my.cnf';
212: if (! -e $conf_file) {
213: if (open MYCNF, ">$conf_file") {
214: print MYCNF <<"ENDMYCNF";
215: [client]
216: user=www
217: password=$perlvar{'lonSqlAccess'}
218: ENDMYCNF
219: close MYCNF;
220: } else {
221: warn "Unable to write $conf_file, continuing";
222: }
223: }
224:
225:
226: #
1.51 matthew 227: # Make sure that database can be accessed
228: #
229: my $dbh;
230: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
231: $perlvar{'lonSqlAccess'},
232: { RaiseError =>0,PrintError=>0})) {
233: print "Cannot connect to database!\n";
234: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
235: my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
236: system("echo 'Cannot connect to MySQL database!' |".
237: " mailto $emailto -s '$subj' > /dev/null");
1.57 www 238:
239: open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
240: print SMP 'time='.time.'&mysql=defunct'."\n";
241: close(SMP);
242:
1.51 matthew 243: exit 1;
244: } else {
1.67 albertel 245: unlink('/home/httpd/html/lon-status/mysql.txt');
1.51 matthew 246: $dbh->disconnect;
247: }
1.52 matthew 248:
1.51 matthew 249: #
250: # Check if other instance running
251: #
252: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
253: if (-e $pidfile) {
254: my $lfh=IO::File->new("$pidfile");
255: my $pide=<$lfh>;
256: chomp($pide);
257: if (kill 0 => $pide) { die "already running"; }
258: }
1.52 matthew 259:
1.49 www 260: #
1.51 matthew 261: # Read hosts file
1.49 www 262: #
1.51 matthew 263: my $thisserver;
1.72 albertel 264: my %hostname;
1.51 matthew 265: my $PREFORK=4; # number of children to maintain, at least four spare
266: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
267: while (my $configline=<CONFIG>) {
1.66 albertel 268: my ($id,$domain,$role,$name)=split(/:/,$configline);
269: $name=~s/\s//g;
1.51 matthew 270: $thisserver=$name if ($id eq $perlvar{'lonHostID'});
1.72 albertel 271: $hostname{$id}=$name;
1.65 albertel 272: #$PREFORK++;
1.45 www 273: }
1.51 matthew 274: close(CONFIG);
275: #
1.65 albertel 276: #$PREFORK=int($PREFORK/4);
1.52 matthew 277:
1.51 matthew 278: #
279: # Create a socket to talk to lond
280: #
281: my $unixsock = "mysqlsock";
282: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
283: my $server;
284: unlink ($localfile);
285: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
286: Type => SOCK_STREAM,
287: Listen => 10)) {
288: print "in socket error:$@\n";
1.45 www 289: }
1.52 matthew 290:
1.51 matthew 291: #
292: # Fork once and dissociate
1.52 matthew 293: #
1.51 matthew 294: my $fpid=fork;
1.1 harris41 295: exit if $fpid;
296: die "Couldn't fork: $!" unless defined ($fpid);
297: POSIX::setsid() or die "Can't start new session: $!";
1.52 matthew 298:
1.51 matthew 299: #
300: # Write our PID on disk
301: my $execdir=$perlvar{'lonDaemons'};
1.1 harris41 302: open (PIDSAVE,">$execdir/logs/lonsql.pid");
303: print PIDSAVE "$$\n";
304: close(PIDSAVE);
1.59 albertel 305: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.52 matthew 306:
1.51 matthew 307: #
308: # Ignore signals generated during initial startup
1.1 harris41 309: $SIG{HUP}=$SIG{USR1}='IGNORE';
1.51 matthew 310: # Now we are on our own
311: # Fork off our children.
1.2 harris41 312: for (1 .. $PREFORK) {
313: make_new_child();
1.1 harris41 314: }
1.52 matthew 315:
1.51 matthew 316: #
1.2 harris41 317: # Install signal handlers.
1.1 harris41 318: $SIG{CHLD} = \&REAPER;
319: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
320: $SIG{HUP} = \&HUPSMAN;
1.52 matthew 321:
1.51 matthew 322: #
1.1 harris41 323: # And maintain the population.
324: while (1) {
325: sleep; # wait for a signal (i.e., child's death)
1.51 matthew 326: for (my $i = $children; $i < $PREFORK; $i++) {
1.2 harris41 327: make_new_child(); # top up the child pool
1.1 harris41 328: }
329: }
330:
1.51 matthew 331: ########################################################
332: ########################################################
333:
334: =pod
335:
336: =item &make_new_child
337:
338: Inputs: None
339:
340: Returns: None
341:
342: =cut
1.2 harris41 343:
1.51 matthew 344: ########################################################
345: ########################################################
1.1 harris41 346: sub make_new_child {
347: my $pid;
348: my $sigset;
1.51 matthew 349: #
1.1 harris41 350: # block signal for fork
351: $sigset = POSIX::SigSet->new(SIGINT);
352: sigprocmask(SIG_BLOCK, $sigset)
353: or die "Can't block SIGINT for fork: $!\n";
1.51 matthew 354: #
1.2 harris41 355: die "fork: $!" unless defined ($pid = fork);
1.51 matthew 356: #
1.1 harris41 357: if ($pid) {
358: # Parent records the child's birth and returns.
359: sigprocmask(SIG_UNBLOCK, $sigset)
360: or die "Can't unblock SIGINT for fork: $!\n";
361: $children{$pid} = 1;
362: $children++;
363: return;
364: } else {
1.2 harris41 365: # Child can *not* return from this subroutine.
1.1 harris41 366: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
367: # unblock signals
368: sigprocmask(SIG_UNBLOCK, $sigset)
369: or die "Can't unblock SIGINT for fork: $!\n";
1.2 harris41 370: #open database handle
371: # making dbh global to avoid garbage collector
1.51 matthew 372: unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
373: $perlvar{'lonSqlAccess'},
374: { RaiseError =>0,PrintError=>0})) {
375: sleep(10+int(rand(20)));
1.59 albertel 376: &logthis("<font color='blue'>WARNING: Couldn't connect to database".
1.51 matthew 377: ": $@</font>");
378: # "($st secs): $@</font>");
379: print "database handle error\n";
380: exit;
381: }
382: # make sure that a database disconnection occurs with
383: # ending kill signals
1.2 harris41 384: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
1.1 harris41 385: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
1.51 matthew 386: for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
387: my $client = $server->accept() or last;
1.2 harris41 388: # do something with the connection
1.1 harris41 389: $run = $run+1;
1.2 harris41 390: my $userinput = <$client>;
391: chomp($userinput);
1.73 www 392: $userinput=~s/\:(\w+)$//;
393: my $searchdomain=$1;
1.51 matthew 394: #
1.45 www 395: my ($conserver,$query,
396: $arg1,$arg2,$arg3)=split(/&/,$userinput);
397: my $query=unescape($query);
1.51 matthew 398: #
1.2 harris41 399: #send query id which is pid_unixdatetime_runningcounter
1.51 matthew 400: my $queryid = $thisserver;
1.2 harris41 401: $queryid .="_".($$)."_";
402: $queryid .= time."_";
403: $queryid .= $run;
404: print $client "$queryid\n";
1.51 matthew 405: #
1.61 matthew 406: # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
1.25 harris41 407: sleep 1;
1.51 matthew 408: #
1.45 www 409: my $result='';
1.51 matthew 410: #
411: # At this point, query is received, query-ID assigned and sent
412: # back, $query eq 'logquery' will mean that this is a query
413: # against log-files
414: if (($query eq 'userlog') || ($query eq 'courselog')) {
415: # beginning of log query
416: my $udom = &unescape($arg1);
417: my $uname = &unescape($arg2);
418: my $command = &unescape($arg3);
419: my $path = &propath($udom,$uname);
420: if (-e "$path/activity.log") {
421: if ($query eq 'userlog') {
422: $result=&userlog($path,$command);
423: } else {
424: $result=&courselog($path,$command);
425: }
426: } else {
427: &logthis('Unable to do log query: '.$uname.'@'.$udom);
428: $result='no_such_file';
429: }
430: # end of log query
1.70 raeburn 431: } elsif (($query eq 'fetchenrollment') ||
1.71 albertel 432: ($query eq 'institutionalphotos')) {
1.62 raeburn 433: # retrieve institutional class lists
434: my $dom = &unescape($arg1);
435: my %affiliates = ();
436: my %replies = ();
437: my $locresult = '';
438: my $querystr = &unescape($arg3);
439: foreach (split/%%/,$querystr) {
1.68 raeburn 440: if (/^([^=]+)=([^=]+)$/) {
1.62 raeburn 441: @{$affiliates{$1}} = split/,/,$2;
442: }
443: }
1.70 raeburn 444: if ($query eq 'fetchenrollment') {
445: $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
446: } elsif ($query eq 'institutionalphotos') {
447: my $crs = &unescape($arg2);
1.75 albertel 448: eval {
449: local($SIG{__DIE__})='DEFAULT';
450: $locresult = &localenroll::institutional_photos($dom,$crs,\%affiliates,\%replies,'update');
451: };
452: if ($@) {
453: $locresult = 'error';
454: }
1.70 raeburn 455: }
1.62 raeburn 456: $result = &escape($locresult.':');
457: if ($locresult) {
458: $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
459: }
1.63 matthew 460: } elsif ($query eq 'prepare activity log') {
461: my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
1.64 matthew 462: &logthis('preparing activity log tables for '.$cid);
1.63 matthew 463: my $command =
1.64 matthew 464: qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
1.63 matthew 465: system($command);
1.64 matthew 466: &logthis($command);
1.63 matthew 467: my $returnvalue = $?>>8;
468: if ($returnvalue) {
469: $result = 'error: parse_activity_log.pl returned '.
470: $returnvalue;
471: } else {
472: $result = 'success';
473: }
1.51 matthew 474: } else {
475: # Do an sql query
1.74 www 476: $result = &do_sql_query($query,$arg1,$arg2,$searchdomain);
1.51 matthew 477: }
1.50 matthew 478: # result does not need to be escaped because it has already been
479: # escaped.
480: #$result=&escape($result);
1.17 harris41 481: &reply("queryreply:$queryid:$result",$conserver);
1.1 harris41 482: }
483: # tidy up gracefully and finish
1.51 matthew 484: #
485: # close the database handle
1.2 harris41 486: $dbh->disconnect
1.59 albertel 487: or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
1.51 matthew 488: " from database $DBI::errstr : $@</font>");
1.1 harris41 489: # this exit is VERY important, otherwise the child will become
490: # a producer of more and more children, forking yourself into
491: # process death.
492: exit;
493: }
1.2 harris41 494: }
1.1 harris41 495:
1.51 matthew 496: ########################################################
497: ########################################################
498:
499: =pod
500:
501: =item &do_sql_query
502:
503: Runs an sql metadata table query.
504:
505: Inputs: $query, $custom, $customshow
506:
507: Returns: A string containing escaped results.
508:
509: =cut
510:
511: ########################################################
512: ########################################################
513: {
514: my @metalist;
515:
516: sub process_file {
517: if ( -e $_ && # file exists
518: -f $_ && # and is a normal file
519: /\.meta$/ && # ends in meta
520: ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
521: ) {
522: push(@metalist,$File::Find::name);
523: }
524: }
525:
526: sub do_sql_query {
1.74 www 527: my ($query,$custom,$customshow,$searchdomain) = @_;
528:
529: #
530: # limit to searchdomain if given and table is metadata
531: #
532: if (($searchdomain) && ($query=~/FROM metadata/)) {
533: $query.=' HAVING (domain="'.$searchdomain.'")';
534: }
535: # &logthis('doing query ('.$searchdomain.')'.$query);
536:
537:
538:
1.51 matthew 539: $custom = &unescape($custom);
540: $customshow = &unescape($customshow);
541: #
542: @metalist = ();
543: #
544: my $result = '';
545: my @results = ();
546: my @files;
547: my $subsetflag=0;
548: #
549: if ($query) {
550: #prepare and execute the query
551: my $sth = $dbh->prepare($query);
552: unless ($sth->execute()) {
1.59 albertel 553: &logthis('<font color="blue">'.
1.58 matthew 554: 'WARNING: Could not retrieve from database:'.
555: $sth->errstr().'</font>');
1.51 matthew 556: } else {
557: my $aref=$sth->fetchall_arrayref;
558: foreach my $row (@$aref) {
559: push @files,@{$row}[3] if ($custom or $customshow);
560: my @b=map { &escape($_); } @$row;
561: push @results,join(",", @b);
562: # Build up the @files array with the LON-CAPA urls
563: # of the resources.
564: }
565: }
566: }
567: # do custom metadata searching here and build into result
568: return join("&",@results) if (! ($custom or $customshow));
569: # Only get here if there is a custom query or custom show request
570: &logthis("Doing custom query for $custom");
571: if ($query) {
572: @metalist=map {
573: $perlvar{'lonDocRoot'}.$_.'.meta';
574: } @files;
575: } else {
576: my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
577: @metalist=();
578: opendir(RESOURCES,$dir);
579: my @homeusers=grep {
580: &ishome($dir.'/'.$_);
581: } grep {!/^\.\.?$/} readdir(RESOURCES);
582: closedir RESOURCES;
583: # Define the
584: foreach my $user (@homeusers) {
585: find (\&process_file,$dir.'/'.$user);
586: }
587: }
588: # if file is indicated in sql database and
589: # not part of sql-relevant query, do not pattern match.
590: #
591: # if file is not in sql database, output error.
592: #
593: # if file is indicated in sql database and is
594: # part of query result list, then do the pattern match.
595: my $customresult='';
596: my @results;
597: foreach my $metafile (@metalist) {
598: my $fh=IO::File->new($metafile);
599: my @lines=<$fh>;
600: my $stuff=join('',@lines);
601: if ($stuff=~/$custom/s) {
602: foreach my $f ('abstract','author','copyright',
603: 'creationdate','keywords','language',
604: 'lastrevisiondate','mime','notes',
605: 'owner','subject','title') {
606: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
607: }
608: my $mfile=$metafile;
609: my $docroot=$perlvar{'lonDocRoot'};
610: $mfile=~s/^$docroot//;
611: $mfile=~s/\.meta$//;
612: unless ($query) {
613: my $q2="SELECT * FROM metadata WHERE url ".
614: " LIKE BINARY '?'";
615: my $sth = $dbh->prepare($q2);
616: $sth->execute($mfile);
617: my $aref=$sth->fetchall_arrayref;
618: foreach my $a (@$aref) {
619: my @b=map { &escape($_)} @$a;
620: push @results,join(",", @b);
621: }
622: }
623: # &logthis("found: $stuff");
624: $customresult.='&custom='.&escape($mfile).','.
625: escape($stuff);
626: }
627: }
628: $result=join("&",@results) unless $query;
629: $result.=$customresult;
630: #
631: return $result;
632: } # End of &do_sql_query
633:
634: } # End of scoping curly braces for &process_file and &do_sql_query
635: ########################################################
636: ########################################################
637:
638: =pod
639:
640: =item &logthis
641:
642: Inputs: $message, the message to log
643:
644: Returns: nothing
645:
646: Writes $message to the logfile.
647:
648: =cut
649:
650: ########################################################
651: ########################################################
652: sub logthis {
653: my $message=shift;
654: my $execdir=$perlvar{'lonDaemons'};
1.52 matthew 655: my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
1.51 matthew 656: my $now=time;
657: my $local=localtime($now);
658: print $fh "$local ($$): $message\n";
1.2 harris41 659: }
1.1 harris41 660:
1.2 harris41 661: # -------------------------------------------------- Non-critical communication
1.1 harris41 662:
1.51 matthew 663: ########################################################
664: ########################################################
665:
666: =pod
667:
668: =item &subreply
669:
670: Sends a command to a server. Called only by &reply.
671:
672: Inputs: $cmd,$server
673:
674: Returns: The results of the message or 'con_lost' on error.
675:
676: =cut
677:
678: ########################################################
679: ########################################################
1.2 harris41 680: sub subreply {
681: my ($cmd,$server)=@_;
1.72 albertel 682: my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
1.2 harris41 683: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
684: Type => SOCK_STREAM,
685: Timeout => 10)
686: or return "con_lost";
1.72 albertel 687: print $sclient "sethost:$server:$cmd\n";
1.2 harris41 688: my $answer=<$sclient>;
689: chomp($answer);
1.51 matthew 690: $answer="con_lost" if (!$answer);
1.2 harris41 691: return $answer;
692: }
1.1 harris41 693:
1.51 matthew 694: ########################################################
695: ########################################################
696:
697: =pod
698:
699: =item &reply
700:
701: Sends a command to a server.
702:
703: Inputs: $cmd,$server
704:
705: Returns: The results of the message or 'con_lost' on error.
706:
707: =cut
708:
709: ########################################################
710: ########################################################
1.2 harris41 711: sub reply {
712: my ($cmd,$server)=@_;
713: my $answer;
714: if ($server ne $perlvar{'lonHostID'}) {
715: $answer=subreply($cmd,$server);
716: if ($answer eq 'con_lost') {
717: $answer=subreply("ping",$server);
718: $answer=subreply($cmd,$server);
719: }
720: } else {
721: $answer='self_reply';
1.33 harris41 722: $answer=subreply($cmd,$server);
1.2 harris41 723: }
724: return $answer;
725: }
1.1 harris41 726:
1.51 matthew 727: ########################################################
728: ########################################################
729:
730: =pod
731:
732: =item &ishome
733:
734: Determine if the current machine is the home server for a user.
735: The determination is made by checking the filesystem for the users information.
736:
737: Inputs: $author
738:
739: Returns: 0 - this is not the authors home server, 1 - this is.
740:
741: =cut
742:
743: ########################################################
744: ########################################################
1.34 harris41 745: sub ishome {
746: my $author=shift;
747: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
748: my ($udom,$uname)=split(/\//,$author);
749: my $proname=propath($udom,$uname);
750: if (-e $proname) {
751: return 1;
752: } else {
753: return 0;
754: }
755: }
756:
1.51 matthew 757: ########################################################
758: ########################################################
759:
760: =pod
761:
762: =item &propath
763:
764: Inputs: user name, user domain
765:
766: Returns: The full path to the users directory.
767:
768: =cut
769:
770: ########################################################
771: ########################################################
1.34 harris41 772: sub propath {
773: my ($udom,$uname)=@_;
774: $udom=~s/\W//g;
775: $uname=~s/\W//g;
776: my $subdir=$uname.'__';
777: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
778: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
779: return $proname;
780: }
1.40 harris41 781:
1.51 matthew 782: ########################################################
783: ########################################################
784:
785: =pod
786:
787: =item &courselog
788:
789: Inputs: $path, $command
790:
791: Returns: unescaped string of values.
792:
793: =cut
794:
795: ########################################################
796: ########################################################
797: sub courselog {
798: my ($path,$command)=@_;
799: my %filters=();
800: foreach (split(/\:/,&unescape($command))) {
801: my ($name,$value)=split(/\=/,$_);
802: $filters{$name}=$value;
803: }
804: my @results=();
805: open(IN,$path.'/activity.log') or return ('file_error');
806: while (my $line=<IN>) {
807: chomp($line);
808: my ($timestamp,$host,$log)=split(/\:/,$line);
809: #
810: # $log has the actual log entries; currently still escaped, and
811: # %26(timestamp)%3a(url)%3a(user)%3a(domain)
812: # then additionally
813: # %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
814: # or
815: # %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
816: #
817: # get delimiter between timestamped entries to be &&&
818: $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
819: # now go over all log entries
820: foreach (split(/\&\&\&/,&unescape($log))) {
821: my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
822: my $values=&unescape(join(':',@values));
823: $values=~s/\&/\:/g;
824: $res=&unescape($res);
825: my $include=1;
826: if (($filters{'username'}) && ($uname ne $filters{'username'}))
827: { $include=0; }
828: if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
829: { $include=0; }
830: if (($filters{'url'}) && ($res!~/$filters{'url'}/))
831: { $include=0; }
832: if (($filters{'start'}) && ($time<$filters{'start'}))
833: { $include=0; }
834: if (($filters{'end'}) && ($time>$filters{'end'}))
835: { $include=0; }
836: if (($filters{'action'} eq 'view') && ($action))
837: { $include=0; }
838: if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
839: { $include=0; }
840: if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
841: { $include=0; }
842: if ($include) {
843: push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
844: $uname.':'.$udom.':'.
845: $action.':'.$values);
846: }
847: }
848: }
849: close IN;
850: return join('&',sort(@results));
851: }
852:
853: ########################################################
854: ########################################################
855:
856: =pod
857:
858: =item &userlog
859:
860: Inputs: $path, $command
861:
862: Returns: unescaped string of values.
1.40 harris41 863:
1.51 matthew 864: =cut
1.40 harris41 865:
1.51 matthew 866: ########################################################
867: ########################################################
868: sub userlog {
869: my ($path,$command)=@_;
870: my %filters=();
871: foreach (split(/\:/,&unescape($command))) {
872: my ($name,$value)=split(/\=/,$_);
873: $filters{$name}=$value;
874: }
875: my @results=();
876: open(IN,$path.'/activity.log') or return ('file_error');
877: while (my $line=<IN>) {
878: chomp($line);
879: my ($timestamp,$host,$log)=split(/\:/,$line);
880: $log=&unescape($log);
881: my $include=1;
882: if (($filters{'start'}) && ($timestamp<$filters{'start'}))
883: { $include=0; }
884: if (($filters{'end'}) && ($timestamp>$filters{'end'}))
885: { $include=0; }
886: if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
887: if (($filters{'action'} eq 'check') && ($log!~/^Check/))
888: { $include=0; }
889: if ($include) {
890: push(@results,$timestamp.':'.$log);
891: }
892: }
893: close IN;
894: return join('&',sort(@results));
1.52 matthew 895: }
896:
897: ########################################################
898: ########################################################
899:
900: =pod
901:
902: =item Functions required for forking
903:
904: =over 4
905:
906: =item REAPER
907:
908: REAPER takes care of dead children.
909:
910: =item HUNTSMAN
911:
912: Signal handler for SIGINT.
913:
914: =item HUPSMAN
915:
916: Signal handler for SIGHUP
917:
918: =item DISCONNECT
919:
920: Disconnects from database.
921:
922: =back
923:
924: =cut
925:
926: ########################################################
927: ########################################################
928: sub REAPER { # takes care of dead children
929: $SIG{CHLD} = \&REAPER;
930: my $pid = wait;
931: $children --;
932: &logthis("Child $pid died");
933: delete $children{$pid};
934: }
935:
936: sub HUNTSMAN { # signal handler for SIGINT
937: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
938: kill 'INT' => keys %children;
939: my $execdir=$perlvar{'lonDaemons'};
940: unlink("$execdir/logs/lonsql.pid");
1.59 albertel 941: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.52 matthew 942: $unixsock = "mysqlsock";
943: my $port="$perlvar{'lonSockDir'}/$unixsock";
944: unlink($port);
945: exit; # clean up with dignity
946: }
947:
948: sub HUPSMAN { # signal handler for SIGHUP
949: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
950: kill 'INT' => keys %children;
951: close($server); # free up socket
1.59 albertel 952: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.52 matthew 953: my $execdir=$perlvar{'lonDaemons'};
954: $unixsock = "mysqlsock";
955: my $port="$perlvar{'lonSockDir'}/$unixsock";
956: unlink($port);
957: exec("$execdir/lonsql"); # here we go again
958: }
959:
960: sub DISCONNECT {
961: $dbh->disconnect or
1.59 albertel 962: &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
1.52 matthew 963: " $DBI::errstr : $@</font>");
964: exit;
1.51 matthew 965: }
1.40 harris41 966:
967:
1.51 matthew 968: =pod
1.40 harris41 969:
1.51 matthew 970: =back
1.40 harris41 971:
972: =cut
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