version 1.38, 2001/11/28 21:49:27
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version 1.62, 2004/06/08 22:09:44
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#!/usr/bin/perl |
#!/usr/bin/perl |
# lonsql-based on the preforker:harsha jagasia:date:5/10/00 |
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# 7/25 Gerd Kortemeyer |
# The LearningOnline Network |
# many different dates Scott Harrison |
# lonsql - LON TCP-MySQL-Server Daemon for handling database requests. |
# 03/22/2001 Scott Harrison |
# |
# 8/30 Gerd Kortemeyer |
# $Id$ |
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# |
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# Copyright Michigan State University Board of Trustees |
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# |
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# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
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# |
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# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
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# |
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=pod |
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=head1 NAME |
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lonsql - LON TCP-MySQL-Server Daemon for handling database requests. |
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=head1 SYNOPSIS |
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This script should be run as user=www. |
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Note that a lonsql.pid file contains the pid of the parent process. |
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=head1 OVERVIEW |
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=head2 Purpose within LON-CAPA |
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LON-CAPA is meant to distribute A LOT of educational content to A LOT |
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of people. It is ineffective to directly rely on contents within the |
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ext2 filesystem to be speedily scanned for on-the-fly searches of |
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content descriptions. (Simply put, it takes a cumbersome amount of |
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time to open, read, analyze, and close thousands of files.) |
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The solution is to index various data fields that are descriptive of |
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the educational resources on a LON-CAPA server machine in a |
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database. Descriptive data fields are referred to as "metadata". The |
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question then arises as to how this metadata is handled in terms of |
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the rest of the LON-CAPA network without burdening client and daemon |
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processes. |
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The obvious solution, using lonc to send a query to a lond process, |
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doesn't work so well in general as you can see in the following |
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example: |
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lonc= loncapa client process A-lonc= a lonc process on Server A |
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lond= loncapa daemon process |
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database command |
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A-lonc --------TCP/IP----------------> B-lond |
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The problem emerges that A-lonc and B-lond are kept waiting for the |
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MySQL server to "do its stuff", or in other words, perform the |
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conceivably sophisticated, data-intensive, time-sucking database |
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transaction. By tying up a lonc and lond process, this significantly |
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cripples the capabilities of LON-CAPA servers. |
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The solution is to offload the work onto another process, and use |
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lonc and lond just for requests and notifications of completed |
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processing: |
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database command |
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A-lonc ---------TCP/IP-----------------> B-lond =====> B-lonsql |
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<---------------------------------/ | |
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"ok, I'll get back to you..." | |
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/ |
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A-lond <------------------------------- B-lonc <====== |
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"Guess what? I have the result!" |
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Of course, depending on success or failure, the messages may vary, but |
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the principle remains the same where a separate pool of children |
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processes (lonsql's) handle the MySQL database manipulations. |
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Thus, lonc and lond spend effectively no time waiting on results from |
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the database. |
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=head1 Internals |
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=over 4 |
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=cut |
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use strict; |
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use lib '/home/httpd/lib/perl/'; |
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use LONCAPA::Configuration; |
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use LONCAPA::lonmetadata(); |
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use IO::Socket; |
use IO::Socket; |
use Symbol; |
use Symbol; |
Line 14 use Socket;
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Line 114 use Socket;
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use Fcntl; |
use Fcntl; |
use Tie::RefHash; |
use Tie::RefHash; |
use DBI; |
use DBI; |
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use File::Find; |
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use localenroll; |
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my @metalist; |
######################################################## |
# ----------------- Code to enable 'find' subroutine listing of the .meta files |
######################################################## |
require "find.pl"; |
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sub wanted { |
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(($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) && |
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-f _ && |
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/^.*\.meta$/ && !/^.+\.\d+\.[^\.]+\.meta$/ && |
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push(@metalist,"$dir/$_"); |
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} |
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$childmaxattempts=10; |
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$run =0;#running counter to generate the query-id |
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# ------------------------------------ Read httpd access.conf and get variables |
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open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf"; |
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while ($configline=<CONFIG>) { |
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if ($configline =~ /PerlSetVar/) { |
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my ($dummy,$varname,$varvalue)=split(/\s+/,$configline); |
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chomp($varvalue); |
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$perlvar{$varname}=$varvalue; |
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} |
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} |
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close(CONFIG); |
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# ------------------------------------- Make sure that database can be accessed |
=pod |
{ |
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my $dbh; |
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unless ( |
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$dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0}) |
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) { |
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print "Cannot connect to database!\n"; |
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$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; |
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$subj="LON: $perlvar{'lonHostID'} Cannot connect to database!"; |
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system("echo 'Cannot connect to MySQL database!' |\ |
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mailto $emailto -s '$subj' > /dev/null"); |
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exit 1; |
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} |
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else { |
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$dbh->disconnect; |
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} |
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} |
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# --------------------------------------------- Check if other instance running |
=item Global Variables |
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my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid"; |
=over 4 |
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=item dbh |
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=back |
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=cut |
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######################################################## |
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######################################################## |
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my $dbh; |
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######################################################## |
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######################################################## |
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=pod |
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=item Variables required for forking |
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=over 4 |
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=item $MAX_CLIENTS_PER_CHILD |
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The number of clients each child should process. |
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=item %children |
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The keys to %children are the current child process IDs |
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=item $children |
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The current number of children |
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=back |
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=cut |
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######################################################## |
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######################################################## |
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my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process |
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my %children = (); # keys are current child process IDs |
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my $children = 0; # current number of children |
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################################################################### |
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################################################################### |
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=pod |
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=item Main body of code. |
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=over 4 |
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=item Read data from loncapa_apache.conf and loncapa.conf. |
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=item Ensure we can access the database. |
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=item Determine if there are other instances of lonsql running. |
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=item Read the hosts file. |
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=item Create a socket for lonsql. |
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=item Fork once and dissociate from parent. |
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=item Write PID to disk. |
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=item Prefork children and maintain the population of children. |
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=back |
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=cut |
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################################################################### |
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################################################################### |
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my $childmaxattempts=10; |
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my $run =0; # running counter to generate the query-id |
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# |
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# Read loncapa_apache.conf and loncapa.conf |
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# |
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my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); |
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my %perlvar=%{$perlvarref}; |
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# |
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# Make sure that database can be accessed |
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# |
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my $dbh; |
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unless ($dbh = DBI->connect("DBI:mysql:loncapa","www", |
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$perlvar{'lonSqlAccess'}, |
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{ RaiseError =>0,PrintError=>0})) { |
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print "Cannot connect to database!\n"; |
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my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; |
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my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!"; |
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system("echo 'Cannot connect to MySQL database!' |". |
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" mailto $emailto -s '$subj' > /dev/null"); |
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open(SMP,'>/home/httpd/html/lon-status/mysql.txt'); |
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print SMP 'time='.time.'&mysql=defunct'."\n"; |
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close(SMP); |
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exit 1; |
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} else { |
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$dbh->disconnect; |
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} |
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# |
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# Check if other instance running |
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# |
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my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid"; |
if (-e $pidfile) { |
if (-e $pidfile) { |
my $lfh=IO::File->new("$pidfile"); |
my $lfh=IO::File->new("$pidfile"); |
my $pide=<$lfh>; |
my $pide=<$lfh>; |
Line 69 if (-e $pidfile) {
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Line 238 if (-e $pidfile) {
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if (kill 0 => $pide) { die "already running"; } |
if (kill 0 => $pide) { die "already running"; } |
} |
} |
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# ------------------------------------------------------------- Read hosts file |
# |
$PREFORK=4; # number of children to maintain, at least four spare |
# Read hosts file |
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# |
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my %hostip; |
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my $thisserver; |
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my $PREFORK=4; # number of children to maintain, at least four spare |
open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; |
open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; |
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while (my $configline=<CONFIG>) { |
while ($configline=<CONFIG>) { |
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my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); |
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); |
chomp($ip); |
chomp($ip); |
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$hostip{$ip}=$id; |
$hostip{$ip}=$id; |
if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } |
$thisserver=$name if ($id eq $perlvar{'lonHostID'}); |
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$PREFORK++; |
$PREFORK++; |
} |
} |
close(CONFIG); |
close(CONFIG); |
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# |
$PREFORK=int($PREFORK/4); |
$PREFORK=int($PREFORK/4); |
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$unixsock = "mysqlsock"; |
# |
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# Create a socket to talk to lond |
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# |
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my $unixsock = "mysqlsock"; |
my $localfile="$perlvar{'lonSockDir'}/$unixsock"; |
my $localfile="$perlvar{'lonSockDir'}/$unixsock"; |
my $server; |
my $server; |
unlink ($localfile); |
unlink ($localfile); |
unless ($server=IO::Socket::UNIX->new(Local =>"$localfile", |
unless ($server=IO::Socket::UNIX->new(Local =>"$localfile", |
Type => SOCK_STREAM, |
Type => SOCK_STREAM, |
Listen => 10)) |
Listen => 10)) { |
{ |
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print "in socket error:$@\n"; |
print "in socket error:$@\n"; |
} |
} |
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# -------------------------------------------------------- Routines for forking |
# |
# global variables |
# Fork once and dissociate |
$MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process |
# |
%children = (); # keys are current child process IDs |
my $fpid=fork; |
$children = 0; # current number of children |
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sub REAPER { # takes care of dead children |
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$SIG{CHLD} = \&REAPER; |
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my $pid = wait; |
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$children --; |
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&logthis("Child $pid died"); |
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delete $children{$pid}; |
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} |
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sub HUNTSMAN { # signal handler for SIGINT |
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local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
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kill 'INT' => keys %children; |
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my $execdir=$perlvar{'lonDaemons'}; |
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unlink("$execdir/logs/lonsql.pid"); |
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&logthis("<font color=red>CRITICAL: Shutting down</font>"); |
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$unixsock = "mysqlsock"; |
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my $port="$perlvar{'lonSockDir'}/$unixsock"; |
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unlink(port); |
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exit; # clean up with dignity |
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} |
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sub HUPSMAN { # signal handler for SIGHUP |
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local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
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kill 'INT' => keys %children; |
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close($server); # free up socket |
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&logthis("<font color=red>CRITICAL: Restarting</font>"); |
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my $execdir=$perlvar{'lonDaemons'}; |
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$unixsock = "mysqlsock"; |
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my $port="$perlvar{'lonSockDir'}/$unixsock"; |
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unlink(port); |
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exec("$execdir/lonsql"); # here we go again |
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} |
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sub logthis { |
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my $message=shift; |
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my $execdir=$perlvar{'lonDaemons'}; |
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my $fh=IO::File->new(">>$execdir/logs/lonsqlfinal.log"); |
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my $now=time; |
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my $local=localtime($now); |
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print $fh "$local ($$): $message\n"; |
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} |
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# ---------------------------------------------------- Fork once and dissociate |
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$fpid=fork; |
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exit if $fpid; |
exit if $fpid; |
die "Couldn't fork: $!" unless defined ($fpid); |
die "Couldn't fork: $!" unless defined ($fpid); |
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POSIX::setsid() or die "Can't start new session: $!"; |
POSIX::setsid() or die "Can't start new session: $!"; |
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# ------------------------------------------------------- Write our PID on disk |
# |
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# Write our PID on disk |
$execdir=$perlvar{'lonDaemons'}; |
my $execdir=$perlvar{'lonDaemons'}; |
open (PIDSAVE,">$execdir/logs/lonsql.pid"); |
open (PIDSAVE,">$execdir/logs/lonsql.pid"); |
print PIDSAVE "$$\n"; |
print PIDSAVE "$$\n"; |
close(PIDSAVE); |
close(PIDSAVE); |
&logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>"); |
&logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>"); |
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# ----------------------------- Ignore signals generated during initial startup |
# |
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# Ignore signals generated during initial startup |
$SIG{HUP}=$SIG{USR1}='IGNORE'; |
$SIG{HUP}=$SIG{USR1}='IGNORE'; |
# ------------------------------------------------------- Now we are on our own |
# Now we are on our own |
# Fork off our children. |
# Fork off our children. |
for (1 .. $PREFORK) { |
for (1 .. $PREFORK) { |
make_new_child(); |
make_new_child(); |
} |
} |
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# |
# Install signal handlers. |
# Install signal handlers. |
$SIG{CHLD} = \&REAPER; |
$SIG{CHLD} = \&REAPER; |
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; |
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; |
$SIG{HUP} = \&HUPSMAN; |
$SIG{HUP} = \&HUPSMAN; |
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# |
# And maintain the population. |
# And maintain the population. |
while (1) { |
while (1) { |
sleep; # wait for a signal (i.e., child's death) |
sleep; # wait for a signal (i.e., child's death) |
for ($i = $children; $i < $PREFORK; $i++) { |
for (my $i = $children; $i < $PREFORK; $i++) { |
make_new_child(); # top up the child pool |
make_new_child(); # top up the child pool |
} |
} |
} |
} |
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######################################################## |
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######################################################## |
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=pod |
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=item &make_new_child |
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Inputs: None |
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Returns: None |
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=cut |
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######################################################## |
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######################################################## |
sub make_new_child { |
sub make_new_child { |
my $pid; |
my $pid; |
my $sigset; |
my $sigset; |
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# |
# block signal for fork |
# block signal for fork |
$sigset = POSIX::SigSet->new(SIGINT); |
$sigset = POSIX::SigSet->new(SIGINT); |
sigprocmask(SIG_BLOCK, $sigset) |
sigprocmask(SIG_BLOCK, $sigset) |
or die "Can't block SIGINT for fork: $!\n"; |
or die "Can't block SIGINT for fork: $!\n"; |
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# |
die "fork: $!" unless defined ($pid = fork); |
die "fork: $!" unless defined ($pid = fork); |
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# |
if ($pid) { |
if ($pid) { |
# Parent records the child's birth and returns. |
# Parent records the child's birth and returns. |
sigprocmask(SIG_UNBLOCK, $sigset) |
sigprocmask(SIG_UNBLOCK, $sigset) |
Line 202 sub make_new_child {
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Line 345 sub make_new_child {
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} else { |
} else { |
# Child can *not* return from this subroutine. |
# Child can *not* return from this subroutine. |
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before |
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before |
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# unblock signals |
# unblock signals |
sigprocmask(SIG_UNBLOCK, $sigset) |
sigprocmask(SIG_UNBLOCK, $sigset) |
or die "Can't unblock SIGINT for fork: $!\n"; |
or die "Can't unblock SIGINT for fork: $!\n"; |
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#open database handle |
#open database handle |
# making dbh global to avoid garbage collector |
# making dbh global to avoid garbage collector |
unless ( |
unless ($dbh = DBI->connect("DBI:mysql:loncapa","www", |
$dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0}) |
$perlvar{'lonSqlAccess'}, |
) { |
{ RaiseError =>0,PrintError=>0})) { |
sleep(10+int(rand(20))); |
sleep(10+int(rand(20))); |
&logthis("<font color=blue>WARNING: Couldn't connect to database ($st secs): $@</font>"); |
&logthis("<font color='blue'>WARNING: Couldn't connect to database". |
print "database handle error\n"; |
": $@</font>"); |
exit; |
# "($st secs): $@</font>"); |
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print "database handle error\n"; |
}; |
exit; |
# make sure that a database disconnection occurs with ending kill signals |
} |
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# make sure that a database disconnection occurs with |
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# ending kill signals |
$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT; |
$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT; |
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# handle connections until we've reached $MAX_CLIENTS_PER_CHILD |
# handle connections until we've reached $MAX_CLIENTS_PER_CHILD |
for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) { |
for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) { |
$client = $server->accept() or last; |
my $client = $server->accept() or last; |
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# do something with the connection |
# do something with the connection |
$run = $run+1; |
$run = $run+1; |
my $userinput = <$client>; |
my $userinput = <$client>; |
chomp($userinput); |
chomp($userinput); |
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# |
my ($conserver,$querytmp, |
my ($conserver,$query, |
$customtmp,$customshowtmp)=split(/&/,$userinput); |
$arg1,$arg2,$arg3)=split(/&/,$userinput); |
my $query=unescape($querytmp); |
my $query=unescape($query); |
my $custom=unescape($customtmp); |
# |
my $customshow=unescape($customshowtmp); |
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#send query id which is pid_unixdatetime_runningcounter |
#send query id which is pid_unixdatetime_runningcounter |
$queryid = $thisserver; |
my $queryid = $thisserver; |
$queryid .="_".($$)."_"; |
$queryid .="_".($$)."_"; |
$queryid .= time."_"; |
$queryid .= time."_"; |
$queryid .= $run; |
$queryid .= $run; |
print $client "$queryid\n"; |
print $client "$queryid\n"; |
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# |
&logthis("QUERY: $query"); |
# &logthis("QUERY: $query - $arg1 - $arg2 - $arg3"); |
&logthis("QUERY: $query"); |
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sleep 1; |
sleep 1; |
#prepare and execute the query |
# |
my $sth = $dbh->prepare($query); |
my $result=''; |
my $result; |
# |
my @files; |
# At this point, query is received, query-ID assigned and sent |
my $subsetflag=0; |
# back, $query eq 'logquery' will mean that this is a query |
if ($query) { |
# against log-files |
unless ($sth->execute()) |
if (($query eq 'userlog') || ($query eq 'courselog')) { |
{ |
# beginning of log query |
&logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>"); |
my $udom = &unescape($arg1); |
$result=""; |
my $uname = &unescape($arg2); |
} |
my $command = &unescape($arg3); |
else { |
my $path = &propath($udom,$uname); |
my $r1=$sth->fetchall_arrayref; |
if (-e "$path/activity.log") { |
my @r2; |
if ($query eq 'userlog') { |
map {my $a=$_; |
$result=&userlog($path,$command); |
my @b=map {escape($_)} @$a; |
} else { |
push @files,@{$a}[3]; |
$result=&courselog($path,$command); |
push @r2,join(",", @b) |
} |
} (@$r1); |
} else { |
$result=join("&",@r2); |
&logthis('Unable to do log query: '.$uname.'@'.$udom); |
} |
$result='no_such_file'; |
} |
} |
# do custom metadata searching here and build into result |
# end of log query |
if ($custom or $customshow) { |
} elsif ($query eq 'fetchenrollment') { |
&logthis("am going to do custom query for $custom"); |
# retrieve institutional class lists |
if ($query) { |
my $dom = &unescape($arg1); |
@metalist=map {$perlvar{'lonDocRoot'}.$_.'.meta'} @files; |
my %affiliates = (); |
} |
my %replies = (); |
else { |
my $locresult = ''; |
@metalist=(); pop @metalist; |
my $querystr = &unescape($arg3); |
opendir(RESOURCES,"$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}"); |
foreach (split/%%/,$querystr) { |
my @homeusers=grep |
if (/^(\w+)=([^=]+)$/) { |
{&ishome("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$_")} |
@{$affiliates{$1}} = split/,/,$2; |
grep {!/^\.\.?$/} readdir(RESOURCES); |
} |
closedir RESOURCES; |
} |
foreach my $user (@homeusers) { |
$locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies); |
&find("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$user"); |
$result = &escape($locresult.':'); |
} |
if ($locresult) { |
} |
$result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies)); |
# &logthis("FILELIST:" . join(":::",@metalist)); |
} |
# if file is indicated in sql database and |
} else { |
# not part of sql-relevant query, do not pattern match. |
# Do an sql query |
# if file is not in sql database, output error. |
$result = &do_sql_query($query,$arg1,$arg2); |
# if file is indicated in sql database and is |
} |
# part of query result list, then do the pattern match. |
# result does not need to be escaped because it has already been |
my $customresult=''; |
# escaped. |
my @r2; |
#$result=&escape($result); |
foreach my $m (@metalist) { |
|
my $fh=IO::File->new($m); |
|
my @lines=<$fh>; |
|
my $stuff=join('',@lines); |
|
if ($stuff=~/$custom/s) { |
|
foreach my $f ('abstract','author','copyright', |
|
'creationdate','keywords','language', |
|
'lastrevisiondate','mime','notes', |
|
'owner','subject','title') { |
|
$stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s; |
|
} |
|
my $m2=$m; my $docroot=$perlvar{'lonDocRoot'}; |
|
$m2=~s/^$docroot//; |
|
$m2=~s/\.meta$//; |
|
unless ($query) { |
|
my $q2="select * from metadata where url like binary '$m2'"; |
|
my $sth = $dbh->prepare($q2); |
|
$sth->execute(); |
|
my $r1=$sth->fetchall_arrayref; |
|
map {my $a=$_; |
|
my @b=map {escape($_)} @$a; |
|
push @files,@{$a}[3]; |
|
push @r2,join(",", @b) |
|
} (@$r1); |
|
} |
|
# &logthis("found: $stuff"); |
|
$customresult.='&custom='.escape($m2).','.escape($stuff); |
|
} |
|
} |
|
$result=join("&",@r2) unless $query; |
|
$result.=$customresult; |
|
} |
|
# reply with result |
|
$result.="\n" if $result; |
|
&reply("queryreply:$queryid:$result",$conserver); |
&reply("queryreply:$queryid:$result",$conserver); |
|
|
} |
} |
|
|
# tidy up gracefully and finish |
# tidy up gracefully and finish |
|
# |
#close the database handle |
# close the database handle |
$dbh->disconnect |
$dbh->disconnect |
or &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>"); |
or &logthis("<font color='blue'>WARNING: Couldn't disconnect". |
|
" from database $DBI::errstr : $@</font>"); |
# this exit is VERY important, otherwise the child will become |
# this exit is VERY important, otherwise the child will become |
# a producer of more and more children, forking yourself into |
# a producer of more and more children, forking yourself into |
# process death. |
# process death. |
Line 345 sub make_new_child {
|
Line 446 sub make_new_child {
|
} |
} |
} |
} |
|
|
sub DISCONNECT { |
######################################################## |
$dbh->disconnect or |
######################################################## |
&logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>"); |
|
exit; |
=pod |
|
|
|
=item &do_sql_query |
|
|
|
Runs an sql metadata table query. |
|
|
|
Inputs: $query, $custom, $customshow |
|
|
|
Returns: A string containing escaped results. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
|
{ |
|
my @metalist; |
|
|
|
sub process_file { |
|
if ( -e $_ && # file exists |
|
-f $_ && # and is a normal file |
|
/\.meta$/ && # ends in meta |
|
! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version |
|
) { |
|
push(@metalist,$File::Find::name); |
|
} |
|
} |
|
|
|
sub do_sql_query { |
|
my ($query,$custom,$customshow) = @_; |
|
$custom = &unescape($custom); |
|
$customshow = &unescape($customshow); |
|
# |
|
@metalist = (); |
|
# |
|
my $result = ''; |
|
my @results = (); |
|
my @files; |
|
my $subsetflag=0; |
|
# |
|
if ($query) { |
|
#prepare and execute the query |
|
my $sth = $dbh->prepare($query); |
|
unless ($sth->execute()) { |
|
&logthis('<font color="blue">'. |
|
'WARNING: Could not retrieve from database:'. |
|
$sth->errstr().'</font>'); |
|
} else { |
|
my $aref=$sth->fetchall_arrayref; |
|
foreach my $row (@$aref) { |
|
push @files,@{$row}[3] if ($custom or $customshow); |
|
my @b=map { &escape($_); } @$row; |
|
push @results,join(",", @b); |
|
# Build up the @files array with the LON-CAPA urls |
|
# of the resources. |
|
} |
|
} |
|
} |
|
# do custom metadata searching here and build into result |
|
return join("&",@results) if (! ($custom or $customshow)); |
|
# Only get here if there is a custom query or custom show request |
|
&logthis("Doing custom query for $custom"); |
|
if ($query) { |
|
@metalist=map { |
|
$perlvar{'lonDocRoot'}.$_.'.meta'; |
|
} @files; |
|
} else { |
|
my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}"; |
|
@metalist=(); |
|
opendir(RESOURCES,$dir); |
|
my @homeusers=grep { |
|
&ishome($dir.'/'.$_); |
|
} grep {!/^\.\.?$/} readdir(RESOURCES); |
|
closedir RESOURCES; |
|
# Define the |
|
foreach my $user (@homeusers) { |
|
find (\&process_file,$dir.'/'.$user); |
|
} |
|
} |
|
# if file is indicated in sql database and |
|
# not part of sql-relevant query, do not pattern match. |
|
# |
|
# if file is not in sql database, output error. |
|
# |
|
# if file is indicated in sql database and is |
|
# part of query result list, then do the pattern match. |
|
my $customresult=''; |
|
my @results; |
|
foreach my $metafile (@metalist) { |
|
my $fh=IO::File->new($metafile); |
|
my @lines=<$fh>; |
|
my $stuff=join('',@lines); |
|
if ($stuff=~/$custom/s) { |
|
foreach my $f ('abstract','author','copyright', |
|
'creationdate','keywords','language', |
|
'lastrevisiondate','mime','notes', |
|
'owner','subject','title') { |
|
$stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s; |
|
} |
|
my $mfile=$metafile; |
|
my $docroot=$perlvar{'lonDocRoot'}; |
|
$mfile=~s/^$docroot//; |
|
$mfile=~s/\.meta$//; |
|
unless ($query) { |
|
my $q2="SELECT * FROM metadata WHERE url ". |
|
" LIKE BINARY '?'"; |
|
my $sth = $dbh->prepare($q2); |
|
$sth->execute($mfile); |
|
my $aref=$sth->fetchall_arrayref; |
|
foreach my $a (@$aref) { |
|
my @b=map { &escape($_)} @$a; |
|
push @results,join(",", @b); |
|
} |
|
} |
|
# &logthis("found: $stuff"); |
|
$customresult.='&custom='.&escape($mfile).','. |
|
escape($stuff); |
|
} |
|
} |
|
$result=join("&",@results) unless $query; |
|
$result.=$customresult; |
|
# |
|
return $result; |
|
} # End of &do_sql_query |
|
|
|
} # End of scoping curly braces for &process_file and &do_sql_query |
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &logthis |
|
|
|
Inputs: $message, the message to log |
|
|
|
Returns: nothing |
|
|
|
Writes $message to the logfile. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
|
sub logthis { |
|
my $message=shift; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
my $fh=IO::File->new(">>$execdir/logs/lonsql.log"); |
|
my $now=time; |
|
my $local=localtime($now); |
|
print $fh "$local ($$): $message\n"; |
} |
} |
|
|
# -------------------------------------------------- Non-critical communication |
# -------------------------------------------------- Non-critical communication |
|
|
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &subreply |
|
|
|
Sends a command to a server. Called only by &reply. |
|
|
|
Inputs: $cmd,$server |
|
|
|
Returns: The results of the message or 'con_lost' on error. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub subreply { |
sub subreply { |
my ($cmd,$server)=@_; |
my ($cmd,$server)=@_; |
my $peerfile="$perlvar{'lonSockDir'}/$server"; |
my $peerfile="$perlvar{'lonSockDir'}/$server"; |
Line 363 sub subreply {
|
Line 629 sub subreply {
|
print $sclient "$cmd\n"; |
print $sclient "$cmd\n"; |
my $answer=<$sclient>; |
my $answer=<$sclient>; |
chomp($answer); |
chomp($answer); |
if (!$answer) { $answer="con_lost"; } |
$answer="con_lost" if (!$answer); |
return $answer; |
return $answer; |
} |
} |
|
|
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &reply |
|
|
|
Sends a command to a server. |
|
|
|
Inputs: $cmd,$server |
|
|
|
Returns: The results of the message or 'con_lost' on error. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub reply { |
sub reply { |
my ($cmd,$server)=@_; |
my ($cmd,$server)=@_; |
my $answer; |
my $answer; |
Line 383 sub reply {
|
Line 666 sub reply {
|
return $answer; |
return $answer; |
} |
} |
|
|
# -------------------------------------------------------- Escape Special Chars |
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &escape |
|
|
|
Escape special characters in a string. |
|
|
|
Inputs: string to escape |
|
|
|
Returns: The input string with special characters escaped. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub escape { |
sub escape { |
my $str=shift; |
my $str=shift; |
$str =~ s/(\W)/"%".unpack('H2',$1)/eg; |
$str =~ s/(\W)/"%".unpack('H2',$1)/eg; |
return $str; |
return $str; |
} |
} |
|
|
# ----------------------------------------------------- Un-Escape Special Chars |
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &unescape |
|
|
|
Unescape special characters in a string. |
|
|
|
Inputs: string to unescape |
|
|
|
Returns: The input string with special characters unescaped. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub unescape { |
sub unescape { |
my $str=shift; |
my $str=shift; |
$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; |
$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; |
return $str; |
return $str; |
} |
} |
|
|
# --------------------------------------- Is this the home server of an author? |
######################################################## |
# (copied from lond, modification of the return value) |
######################################################## |
|
|
|
=pod |
|
|
|
=item &ishome |
|
|
|
Determine if the current machine is the home server for a user. |
|
The determination is made by checking the filesystem for the users information. |
|
|
|
Inputs: $author |
|
|
|
Returns: 0 - this is not the authors home server, 1 - this is. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub ishome { |
sub ishome { |
my $author=shift; |
my $author=shift; |
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; |
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; |
Line 413 sub ishome {
|
Line 742 sub ishome {
|
} |
} |
} |
} |
|
|
# -------------------------------------------- Return path to profile directory |
######################################################## |
# (copied from lond) |
######################################################## |
|
|
|
=pod |
|
|
|
=item &propath |
|
|
|
Inputs: user name, user domain |
|
|
|
Returns: The full path to the users directory. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
sub propath { |
sub propath { |
my ($udom,$uname)=@_; |
my ($udom,$uname)=@_; |
$udom=~s/\W//g; |
$udom=~s/\W//g; |
Line 424 sub propath {
|
Line 766 sub propath {
|
my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; |
my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; |
return $proname; |
return $proname; |
} |
} |
|
|
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &courselog |
|
|
|
Inputs: $path, $command |
|
|
|
Returns: unescaped string of values. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
|
sub courselog { |
|
my ($path,$command)=@_; |
|
my %filters=(); |
|
foreach (split(/\:/,&unescape($command))) { |
|
my ($name,$value)=split(/\=/,$_); |
|
$filters{$name}=$value; |
|
} |
|
my @results=(); |
|
open(IN,$path.'/activity.log') or return ('file_error'); |
|
while (my $line=<IN>) { |
|
chomp($line); |
|
my ($timestamp,$host,$log)=split(/\:/,$line); |
|
# |
|
# $log has the actual log entries; currently still escaped, and |
|
# %26(timestamp)%3a(url)%3a(user)%3a(domain) |
|
# then additionally |
|
# %3aPOST%3a(name)%3d(value)%3a(name)%3d(value) |
|
# or |
|
# %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value) |
|
# |
|
# get delimiter between timestamped entries to be &&& |
|
$log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g; |
|
# now go over all log entries |
|
foreach (split(/\&\&\&/,&unescape($log))) { |
|
my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_); |
|
my $values=&unescape(join(':',@values)); |
|
$values=~s/\&/\:/g; |
|
$res=&unescape($res); |
|
my $include=1; |
|
if (($filters{'username'}) && ($uname ne $filters{'username'})) |
|
{ $include=0; } |
|
if (($filters{'domain'}) && ($udom ne $filters{'domain'})) |
|
{ $include=0; } |
|
if (($filters{'url'}) && ($res!~/$filters{'url'}/)) |
|
{ $include=0; } |
|
if (($filters{'start'}) && ($time<$filters{'start'})) |
|
{ $include=0; } |
|
if (($filters{'end'}) && ($time>$filters{'end'})) |
|
{ $include=0; } |
|
if (($filters{'action'} eq 'view') && ($action)) |
|
{ $include=0; } |
|
if (($filters{'action'} eq 'submit') && ($action ne 'POST')) |
|
{ $include=0; } |
|
if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE')) |
|
{ $include=0; } |
|
if ($include) { |
|
push(@results,($time<1000000000?'0':'').$time.':'.$res.':'. |
|
$uname.':'.$udom.':'. |
|
$action.':'.$values); |
|
} |
|
} |
|
} |
|
close IN; |
|
return join('&',sort(@results)); |
|
} |
|
|
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item &userlog |
|
|
|
Inputs: $path, $command |
|
|
|
Returns: unescaped string of values. |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
|
sub userlog { |
|
my ($path,$command)=@_; |
|
my %filters=(); |
|
foreach (split(/\:/,&unescape($command))) { |
|
my ($name,$value)=split(/\=/,$_); |
|
$filters{$name}=$value; |
|
} |
|
my @results=(); |
|
open(IN,$path.'/activity.log') or return ('file_error'); |
|
while (my $line=<IN>) { |
|
chomp($line); |
|
my ($timestamp,$host,$log)=split(/\:/,$line); |
|
$log=&unescape($log); |
|
my $include=1; |
|
if (($filters{'start'}) && ($timestamp<$filters{'start'})) |
|
{ $include=0; } |
|
if (($filters{'end'}) && ($timestamp>$filters{'end'})) |
|
{ $include=0; } |
|
if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; } |
|
if (($filters{'action'} eq 'check') && ($log!~/^Check/)) |
|
{ $include=0; } |
|
if ($include) { |
|
push(@results,$timestamp.':'.$log); |
|
} |
|
} |
|
close IN; |
|
return join('&',sort(@results)); |
|
} |
|
|
|
######################################################## |
|
######################################################## |
|
|
|
=pod |
|
|
|
=item Functions required for forking |
|
|
|
=over 4 |
|
|
|
=item REAPER |
|
|
|
REAPER takes care of dead children. |
|
|
|
=item HUNTSMAN |
|
|
|
Signal handler for SIGINT. |
|
|
|
=item HUPSMAN |
|
|
|
Signal handler for SIGHUP |
|
|
|
=item DISCONNECT |
|
|
|
Disconnects from database. |
|
|
|
=back |
|
|
|
=cut |
|
|
|
######################################################## |
|
######################################################## |
|
sub REAPER { # takes care of dead children |
|
$SIG{CHLD} = \&REAPER; |
|
my $pid = wait; |
|
$children --; |
|
&logthis("Child $pid died"); |
|
delete $children{$pid}; |
|
} |
|
|
|
sub HUNTSMAN { # signal handler for SIGINT |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
kill 'INT' => keys %children; |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
unlink("$execdir/logs/lonsql.pid"); |
|
&logthis("<font color='red'>CRITICAL: Shutting down</font>"); |
|
$unixsock = "mysqlsock"; |
|
my $port="$perlvar{'lonSockDir'}/$unixsock"; |
|
unlink($port); |
|
exit; # clean up with dignity |
|
} |
|
|
|
sub HUPSMAN { # signal handler for SIGHUP |
|
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children |
|
kill 'INT' => keys %children; |
|
close($server); # free up socket |
|
&logthis("<font color='red'>CRITICAL: Restarting</font>"); |
|
my $execdir=$perlvar{'lonDaemons'}; |
|
$unixsock = "mysqlsock"; |
|
my $port="$perlvar{'lonSockDir'}/$unixsock"; |
|
unlink($port); |
|
exec("$execdir/lonsql"); # here we go again |
|
} |
|
|
|
sub DISCONNECT { |
|
$dbh->disconnect or |
|
&logthis("<font color='blue'>WARNING: Couldn't disconnect from database ". |
|
" $DBI::errstr : $@</font>"); |
|
exit; |
|
} |
|
|
|
|
|
=pod |
|
|
|
=back |
|
|
|
=cut |