--- loncom/Attic/lonc 2001/11/26 22:20:26 1.18
+++ loncom/Attic/lonc 2002/02/06 14:15:37 1.25
@@ -5,6 +5,30 @@
# provides persistent TCP connections to the other servers in the network
# through multiplexed domain sockets
#
+# $Id: lonc,v 1.25 2002/02/06 14:15:37 albertel 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/
+#
# PID in subdir logs/lonc.pid
# kill kills
# HUP restarts
@@ -15,8 +39,10 @@
# 2/8,7/25 Gerd Kortemeyer
# 12/05 Scott Harrison
# 12/05 Gerd Kortemeyer
+# YEAR=2001
# 01/10/01 Scott Harrison
-# 03/14/01,03/15,06/12,11/26 Gerd Kortemeyer
+# 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
+# 12/20 Scott Harrison
#
# based on nonforker from Perl Cookbook
# - server who multiplexes without forking
@@ -119,13 +145,13 @@ sub REAPER { # ta
sub HUNTSMAN { # signal handler for SIGINT
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- map {
+ foreach (keys %children) {
$wasserver=$children{$_};
&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
- } keys %children;
+ }
my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");
&logthis("CRITICAL: Shutting down");
@@ -134,13 +160,13 @@ sub HUNTSMAN { # si
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- map {
+ foreach (keys %children) {
$wasserver=$children{$_};
&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
- } keys %children;
+ }
&logthis("CRITICAL: Restarting");
unlink("$execdir/logs/lonc.pid");
my $execdir=$perlvar{'lonDaemons'};
@@ -151,13 +177,13 @@ sub checkchildren {
&initnewstatus();
&logstatus();
&logthis('Going to check on the children');
- map {
+ foreach (sort keys %children) {
sleep 1;
unless (kill 'USR1' => $_) {
&logthis ('Child '.$_.' is dead');
&logstatus($$.' is dead');
}
- } sort keys %children;
+ }
}
sub USRMAN {
@@ -182,10 +208,20 @@ sub subreply {
Type => SOCK_STREAM,
Timeout => 10)
or return "con_lost";
- print $sclient "$cmd\n";
- my $answer=<$sclient>;
- chomp($answer);
- if (!$answer) { $answer="con_lost"; }
+
+
+ $SIG{ALRM}=sub { die "timeout" };
+ $SIG{__DIE__}='DEFAULT';
+ eval {
+ alarm(10);
+ print $sclient "$cmd\n";
+ $answer=<$sclient>;
+ chomp($answer);
+ alarm(0);
+ };
+ if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; }
+ $SIG{ALRM}='DEFAULT';
+ $SIG{__DIE__}=\&catchexception;
} else { $answer='self_reply'; }
return $answer;
}
@@ -344,15 +380,30 @@ unless (
sleep($st);
exit;
};
-# --------------------------------------- Send a ping to make other end do USR1
+# ----------------------------------------------------------------- Init dialog
&status("Init dialogue: $conserver");
+ $SIG{ALRM}=sub { die "timeout" };
+ $SIG{__DIE__}='DEFAULT';
+ eval {
+ alarm(60);
print $remotesock "init\n";
$answer=<$remotesock>;
print $remotesock "$answer";
$answer=<$remotesock>;
chomp($answer);
+ alarm(0);
+ };
+ $SIG{ALRM}='DEFAULT';
+ $SIG{__DIE__}=\&catchexception;
+
+ if ($@=~/timeout/) {
+ &logthis("Timed out during init: $conserver");
+ exit;
+ }
+
+
&logthis("Init reply for $conserver: >$answer<");
if ($answer ne 'ok') {
my $st=120+int(rand(240));
@@ -398,7 +449,7 @@ if ($cipher=new IDEA $cipherkey) {
@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
closedir(DIRHANDLE);
my $dfname;
- map {
+ foreach (@allbuffered) {
&status("Sending delayed $conserver $_");
$dfname="$path/$_";
&logthis($dfname);
@@ -422,16 +473,24 @@ if ($cipher=new IDEA $cipherkey) {
}
$cmd="enc:$cmdlength:$encrequest\n";
}
-
+ $SIG{ALRM}=sub { die "timeout" };
+ $SIG{__DIE__}='DEFAULT';
+ eval {
+ alarm(60);
print $remotesock "$cmd\n";
$answer=<$remotesock>;
chomp($answer);
- if ($answer ne '') {
+ alarm(0);
+ };
+ $SIG{ALRM}='DEFAULT';
+ $SIG{__DIE__}=\&catchexception;
+
+ if (($answer ne '') && ($@!~/timeout/)) {
unlink("$dfname");
&logthis("Delayed $cmd to $conserver: >$answer<");
&logperm("S:$conserver:$bcmd");
}
- } @allbuffered;
+ }
# ------------------------------------------------------- Listen to UNIX socket
&status("Opening socket $conserver");
@@ -576,11 +635,27 @@ sub handle {
}
$request="enc:$cmdlength:$encrequest\n";
}
+# --------------------------------------------------------------- Main exchange
+ $SIG{ALRM}=sub { die "timeout" };
+ $SIG{__DIE__}='DEFAULT';
+ eval {
+ alarm(300);
&status("Sending $conserver: $request");
print $remotesock "$request";
&status("Waiting for reply from $conserver: $request");
$answer=<$remotesock>;
&status("Received reply: $request");
+ alarm(0);
+ };
+ if ($@=~/timeout/) {
+ $answer='';
+ &logthis(
+ "CRITICAL: Timeout $conserver: $request");
+ }
+ $SIG{ALRM}='DEFAULT';
+ $SIG{__DIE__}=\&catchexception;
+
+
if ($answer) {
if ($answer =~ /^enc/) {
my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);
@@ -620,3 +695,50 @@ sub nonblock {
or die "Can't make socket nonblocking: $!\n";
}
+# ----------------------------------- POD (plain old documentation, CPAN style)
+
+=head1 NAME
+
+lonc - LON TCP-MySQL-Server Daemon for handling database requests.
+
+=head1 SYNOPSIS
+
+Should only be run as user=www. This is a command-line script which
+is invoked by loncron.
+
+=head1 DESCRIPTION
+
+Provides persistent TCP connections to the other servers in the network
+through multiplexed domain sockets
+
+ PID in subdir logs/lonc.pid
+ kill kills
+ HUP restarts
+ USR1 tries to open connections again
+
+=head1 README
+
+Not yet written.
+
+=head1 PREREQUISITES
+
+POSIX
+IO::Socket
+IO::Select
+IO::File
+Socket
+Fcntl
+Tie::RefHash
+Crypt::IDEA
+
+=head1 COREQUISITES
+
+=head1 OSNAMES
+
+linux
+
+=head1 SCRIPT CATEGORIES
+
+Server/Process
+
+=cut