--- loncom/lonsql 2001/10/17 02:15:59 1.37
+++ loncom/lonsql 2002/06/17 14:00:09 1.44
@@ -1,9 +1,61 @@
#!/usr/bin/perl
+
+# The LearningOnline Network
+# lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
+#
+# $Id: lonsql,v 1.44 2002/06/17 14:00:09 www Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
+# YEAR=2000
# lonsql-based on the preforker:harsha jagasia:date:5/10/00
# 7/25 Gerd Kortemeyer
# many different dates Scott Harrison
+# YEAR=2001
+# many different dates Scott Harrison
# 03/22/2001 Scott Harrison
# 8/30 Gerd Kortemeyer
+# 10/17,11/28,11/29,12/20 Scott Harrison
+# YEAR=2001
+# 5/11 Scott Harrison
+#
+###
+
+###############################################################################
+## ##
+## ORGANIZATION OF THIS PERL SCRIPT ##
+## 1. Modules used ##
+## 2. Enable find subroutine ##
+## 3. Read httpd config files and get variables ##
+## 4. Make sure that database can be accessed ##
+## 5. Make sure this process is running from user=www ##
+## 6. Check if other instance is running ##
+## 7. POD (plain old documentation, CPAN style) ##
+## ##
+###############################################################################
+
+use lib '/home/httpd/lib/perl/';
+use LONCAPA::Configuration;
use IO::Socket;
use Symbol;
@@ -28,17 +80,10 @@ sub wanted {
$childmaxattempts=10;
$run =0;#running counter to generate the query-id
-# ------------------------------------ Read httpd access.conf and get variables
-open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
-
-while ($configline=<CONFIG>) {
- if ($configline =~ /PerlSetVar/) {
- my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
- chomp($varvalue);
- $perlvar{$varname}=$varvalue;
- }
-}
-close(CONFIG);
+# -------------------------------- Read loncapa_apache.conf and loncapa.conf
+my $perlvarref=LONCAPA::Configuration::read_conf('loncapa_apache.conf',
+ 'loncapa.conf');
+my %perlvar=%{$perlvarref};
# ------------------------------------- Make sure that database can be accessed
{
@@ -47,7 +92,11 @@ close(CONFIG);
$dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})
) {
print "Cannot connect to database!\n";
- exit;
+ $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+ $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
+ system("echo 'Cannot connect to MySQL database!' |\
+ mailto $emailto -s '$subj' > /dev/null");
+ exit 1;
}
else {
$dbh->disconnect;
@@ -241,8 +290,13 @@ sub make_new_child {
print $client "$queryid\n";
&logthis("QUERY: $query");
- &logthis("QUERY: $query");
sleep 1;
+
+# ---------- At this point, query is received, query-ID assigned and sent back
+# $query eq 'logquery' will mean that this is a query against log-files
+
+ unless ($query eq 'logquery') {
+# -------------------------------------------------------- This is an sql query
#prepare and execute the query
my $sth = $dbh->prepare($query);
my $result;
@@ -257,11 +311,11 @@ sub make_new_child {
else {
my $r1=$sth->fetchall_arrayref;
my @r2;
- map {my $a=$_;
+ foreach (@$r1) {my $a=$_;
my @b=map {escape($_)} @$a;
push @files,@{$a}[3];
push @r2,join(",", @b)
- } (@$r1);
+ }
$result=join("&",@r2);
}
}
@@ -309,11 +363,11 @@ sub make_new_child {
my $sth = $dbh->prepare($q2);
$sth->execute();
my $r1=$sth->fetchall_arrayref;
- map {my $a=$_;
+ foreach (@$r1) {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);
@@ -322,8 +376,17 @@ sub make_new_child {
$result=join("&",@r2) unless $query;
$result.=$customresult;
}
- # reply with result
- $result.="\n" if $result;
+# ------------------------------------------------------------ end of sql query
+ } else {
+# ------------------------------------------------------ beginning of log query
+#
+# do log queries here
+#
+ $result='not_yet_implemented';
+# ------------------------------------------------------------ end of log query
+ }
+ # reply with result, append \n unless already there
+ $result.="\n" unless ($result=~/\n$/);
&reply("queryreply:$queryid:$result",$conserver);
}
@@ -420,3 +483,75 @@ sub propath {
my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
return $proname;
}
+
+# ----------------------------------- POD (plain old documentation, CPAN style)
+
+=head1 NAME
+
+lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
+
+=head1 SYNOPSIS
+
+This script should be run as user=www. The following is an example invocation
+from the loncron script. Note that a lonsql.pid file contains the pid of
+the parent process.
+
+ if (-e $lonsqlfile) {
+ my $lfh=IO::File->new("$lonsqlfile");
+ my $lonsqlpid=<$lfh>;
+ chomp($lonsqlpid);
+ if (kill 0 => $lonsqlpid) {
+ print $fh "<h3>lonsql at pid $lonsqlpid responding</h3>";
+ $restartflag=0;
+ } else {
+ $errors++; $errors++;
+ print $fh "<h3>lonsql at pid $lonsqlpid not responding</h3>";
+ $restartflag=1;
+ print $fh
+ "<h3>Decided to clean up stale .pid file and restart lonsql</h3>";
+ }
+ }
+ if ($restartflag==1) {
+ $errors++;
+ print $fh '<br><font color="red">Killall lonsql: '.
+ system('killall lonsql').' - ';
+ sleep 60;
+ print $fh unlink($lonsqlfile).' - '.
+ system('killall -9 lonsql').
+ '</font><br>';
+ print $fh "<h3>lonsql not running, trying to start</h3>";
+ system(
+ "$perlvar{'lonDaemons'}/lonsql 2>>$perlvar{'lonDaemons'}/logs/lonsql_errors");
+ sleep 10;
+
+=head1 DESCRIPTION
+
+Not yet written.
+
+=head1 README
+
+Not yet written.
+
+=head1 PREREQUISITES
+
+IO::Socket
+Symbol
+POSIX
+IO::Select
+IO::File
+Socket
+Fcntl
+Tie::RefHash
+DBI
+
+=head1 COREQUISITES
+
+=head1 OSNAMES
+
+linux
+
+=head1 SCRIPT CATEGORIES
+
+Server/Process
+
+=cut