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Diff for /loncom/Attic/lonc between versions 1.18 and 1.28

version 1.18, 2001/11/26 22:20:26	version 1.28, 2002/02/19 22:51:13
Line 5	Line 5
# provides persistent TCP connections to the other servers in the network	# provides persistent TCP connections to the other servers in the network
# through multiplexed domain sockets	# through multiplexed domain sockets
#	#
	# $Id$
	#
	# 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	# PID in subdir logs/lonc.pid
# kill kills	# kill kills
# HUP restarts	# HUP restarts
Line 15	Line 39
# 2/8,7/25 Gerd Kortemeyer	# 2/8,7/25 Gerd Kortemeyer
# 12/05 Scott Harrison	# 12/05 Scott Harrison
# 12/05 Gerd Kortemeyer	# 12/05 Gerd Kortemeyer
	# YEAR=2001
# 01/10/01 Scott Harrison	# 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
	# YEAR=2002
	# 2/19/02
#	#
# based on nonforker from Perl Cookbook	# based on nonforker from Perl Cookbook
# - server who multiplexes without forking	# - server who multiplexes without forking
Line 29 use Socket;	Line 57 use Socket;
use Fcntl;	use Fcntl;
use Tie::RefHash;	use Tie::RefHash;
use Crypt::IDEA;	use Crypt::IDEA;
	use Net::Ping;
	use LWP::UserAgent();

my $status='';	my $status='';
my $lastlog='';	my $lastlog='';
Line 46 sub catchexception {	Line 76 sub catchexception {

$childmaxattempts=5;	$childmaxattempts=5;

	# -------------------------------------- Routines to see if other box available

	sub online {
	my $host=shift;
	my $p=Net::Ping->new("tcp",20);
	my $online=$p->ping("$host");
	$p->close();
	undef ($p);
	return $online;
	}

	sub connected {
	my ($local,$remote)=@_;
	$local=~s/\W//g;
	$remote=~s/\W//g;

	unless ($hostname{$local}) { return 'local_unknown'; }
	unless ($hostname{$remote}) { return 'remote_unknown'; }

	unless (&online($hostname{$local})) { return 'local_offline'; }

	my $ua=new LWP::UserAgent;

	my $request=new HTTP::Request('GET',
	"http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote);

	my $response=$ua->request($request);

	unless ($response->is_success) { return 'local_error'; }

	my $reply=$response->content;
	$reply=(split("\n",$reply))[0];
	$reply=~s/\W//g;
	if ($reply ne $remote) { return $reply; }
	return 'ok';
	}


# -------------------------------- Set signal handlers to record abnormal exits	# -------------------------------- Set signal handlers to record abnormal exits

$SIG{'QUIT'}=\&catchexception;	$SIG{QUIT}=\&catchexception;
$SIG{__DIE__}=\&catchexception;	$SIG{__DIE__}=\&catchexception;

# ------------------------------------ Read httpd access.conf and get variables	# ------------------------------------ Read httpd access.conf and get variables
Line 92 open (CONFIG,"$perlvar{'lonTabDir'}/host	Line 160 open (CONFIG,"$perlvar{'lonTabDir'}/host
while ($configline=<CONFIG>) {	while ($configline=<CONFIG>) {
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
chomp($ip);	chomp($ip);
$hostip{$id}=$ip;	if ($ip) {
	$hostip{$id}=$ip;
	$hostname{$id}=$name;
	}
}	}

close(CONFIG);	close(CONFIG);

# -------------------------------------------------------- Routines for forking	# -------------------------------------------------------- Routines for forking
Line 117 sub REAPER { # ta	Line 189 sub REAPER { # ta
unlink($port);	unlink($port);
}	}

sub HUNTSMAN { # signal handler for SIGINT	sub hangup {
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children	foreach (keys %children) {
map {
$wasserver=$children{$_};	$wasserver=$children{$_};
&status("Closing $wasserver");	&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));	&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");	&status("Kill PID $_ for $wasserver");
kill ('INT',$_);	kill ('INT',$_);
} keys %children;	}
	}

	sub HUNTSMAN { # signal handler for SIGINT
	local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
	&hangup();
my $execdir=$perlvar{'lonDaemons'};	my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");	unlink("$execdir/logs/lonc.pid");
&logthis("<font color=red>CRITICAL: Shutting down</font>");	&logthis("<font color=red>CRITICAL: Shutting down</font>");
Line 134 sub HUNTSMAN { # si	Line 210 sub HUNTSMAN { # si

sub HUPSMAN { # signal handler for SIGHUP	sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children	local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
map {	&hangup();
$wasserver=$children{$_};
&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
} keys %children;
&logthis("<font color=red>CRITICAL: Restarting</font>");	&logthis("<font color=red>CRITICAL: Restarting</font>");
unlink("$execdir/logs/lonc.pid");	unlink("$execdir/logs/lonc.pid");
my $execdir=$perlvar{'lonDaemons'};	my $execdir=$perlvar{'lonDaemons'};
Line 151 sub checkchildren {	Line 221 sub checkchildren {
&initnewstatus();	&initnewstatus();
&logstatus();	&logstatus();
&logthis('Going to check on the children');	&logthis('Going to check on the children');
map {	foreach (sort keys %children) {
sleep 1;	sleep 1;
unless (kill 'USR1' => $_) {	unless (kill 'USR1' => $_) {
&logthis ('Child '.$_.' is dead');	&logthis ('Child '.$_.' is dead');
&logstatus($$.' is dead');	&logstatus($$.' is dead');
}	}
} sort keys %children;	}
}	}

sub USRMAN {	sub USRMAN {
&logthis("USR1: Trying to establish connections again");	&logthis("USR1: Trying to establish connections again");
foreach $thisserver (keys %hostip) {
$answer=subreply("ping",$thisserver);
&logthis("USR1: Ping $thisserver "
."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): "
." >$answer<");
}
%childatt=();	%childatt=();
&checkchildren();	&checkchildren();
}	}
Line 182 sub subreply {	Line 246 sub subreply {
Type => SOCK_STREAM,	Type => SOCK_STREAM,
Timeout => 10)	Timeout => 10)
or return "con_lost";	or return "con_lost";
print $sclient "$cmd\n";
my $answer=<$sclient>;
chomp($answer);	$SIG{ALRM}=sub { die "timeout" };
if (!$answer) { $answer="con_lost"; }	$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'; }	} else { $answer='self_reply'; }
return $answer;	return $answer;
}	}
Line 262 $SIG{HUP}=$SIG{USR1}='IGNORE';	Line 336 $SIG{HUP}=$SIG{USR1}='IGNORE';
&status("Forking ...");	&status("Forking ...");

foreach $thisserver (keys %hostip) {	foreach $thisserver (keys %hostip) {
make_new_child($thisserver);	if (&online($hostname{$thisserver})) {
	make_new_child($thisserver);
	}
}	}

&logthis("Done starting initial servers");	&logthis("Done starting initial servers");
Line 281 while (1) {	Line 357 while (1) {
&status("Woke up");	&status("Woke up");
foreach $thisserver (keys %hostip) {	foreach $thisserver (keys %hostip) {
if (!$childpid{$thisserver}) {	if (!$childpid{$thisserver}) {
if ($childatt{$thisserver}<$childmaxattempts) {	if (($childatt{$thisserver}<$childmaxattempts) &&
	(&online($hostname{$thisserver}))) {
$childatt{$thisserver}++;	$childatt{$thisserver}++;
&logthis(	&logthis(
"<font color=yellow>INFO: Trying to reconnect for $thisserver "	"<font color=yellow>INFO: Trying to reconnect for $thisserver "
."($childatt{$thisserver} of $childmaxattempts attempts)</font>");	."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
make_new_child($thisserver);	make_new_child($thisserver);
}	} else {
	&logthis(
	"<font color=yellow>INFO: Skipping $thisserver "
	."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
	}

}	}
}	}
}	}
Line 344 unless (	Line 426 unless (
sleep($st);	sleep($st);
exit;	exit;
};	};
# --------------------------------------- Send a ping to make other end do USR1	# ----------------------------------------------------------------- Init dialog

&status("Init dialogue: $conserver");	&status("Init dialogue: $conserver");

	$SIG{ALRM}=sub { die "timeout" };
	$SIG{__DIE__}='DEFAULT';
	eval {
	alarm(60);
print $remotesock "init\n";	print $remotesock "init\n";
$answer=<$remotesock>;	$answer=<$remotesock>;
print $remotesock "$answer";	print $remotesock "$answer";
$answer=<$remotesock>;	$answer=<$remotesock>;
chomp($answer);	chomp($answer);
	alarm(0);
	};
	$SIG{ALRM}='DEFAULT';
	$SIG{__DIE__}=\&catchexception;

	if ($@=~/timeout/) {
	&logthis("Timed out during init: $conserver");
	exit;
	}


&logthis("Init reply for $conserver: >$answer<");	&logthis("Init reply for $conserver: >$answer<");
if ($answer ne 'ok') {	if ($answer ne 'ok') {
my $st=120+int(rand(240));	my $st=120+int(rand(240));
Line 398 if ($cipher=new IDEA $cipherkey) {	Line 495 if ($cipher=new IDEA $cipherkey) {
@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;	@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
closedir(DIRHANDLE);	closedir(DIRHANDLE);
my $dfname;	my $dfname;
map {	foreach (@allbuffered) {
&status("Sending delayed $conserver $_");	&status("Sending delayed $conserver $_");
$dfname="$path/$_";	$dfname="$path/$_";
&logthis($dfname);	&logthis($dfname);
Line 422 if ($cipher=new IDEA $cipherkey) {	Line 519 if ($cipher=new IDEA $cipherkey) {
}	}
$cmd="enc:$cmdlength:$encrequest\n";	$cmd="enc:$cmdlength:$encrequest\n";
}	}
	$SIG{ALRM}=sub { die "timeout" };
	$SIG{__DIE__}='DEFAULT';
	eval {
	alarm(60);
print $remotesock "$cmd\n";	print $remotesock "$cmd\n";
$answer=<$remotesock>;	$answer=<$remotesock>;
chomp($answer);	chomp($answer);
if ($answer ne '') {	alarm(0);
	};
	$SIG{ALRM}='DEFAULT';
	$SIG{__DIE__}=\&catchexception;

	if (($answer ne '') && ($@!~/timeout/)) {
unlink("$dfname");	unlink("$dfname");
&logthis("Delayed $cmd to $conserver: >$answer<");	&logthis("Delayed $cmd to $conserver: >$answer<");
&logperm("S:$conserver:$bcmd");	&logperm("S:$conserver:$bcmd");
}	}
} @allbuffered;	}

# ------------------------------------------------------- Listen to UNIX socket	# ------------------------------------------------------- Listen to UNIX socket
&status("Opening socket $conserver");	&status("Opening socket $conserver");
Line 576 sub handle {	Line 681 sub handle {
}	}
$request="enc:$cmdlength:$encrequest\n";	$request="enc:$cmdlength:$encrequest\n";
}	}
	# --------------------------------------------------------------- Main exchange
	$SIG{ALRM}=sub { die "timeout" };
	$SIG{__DIE__}='DEFAULT';
	eval {
	alarm(300);
&status("Sending $conserver: $request");	&status("Sending $conserver: $request");
print $remotesock "$request";	print $remotesock "$request";
&status("Waiting for reply from $conserver: $request");	&status("Waiting for reply from $conserver: $request");
$answer=<$remotesock>;	$answer=<$remotesock>;
&status("Received reply: $request");	&status("Received reply: $request");
	alarm(0);
	};
	if ($@=~/timeout/) {
	$answer='';
	&logthis(
	"<font color=red>CRITICAL: Timeout $conserver: $request</font>");
	}
	$SIG{ALRM}='DEFAULT';
	$SIG{__DIE__}=\&catchexception;


if ($answer) {	if ($answer) {
if ($answer =~ /^enc/) {	if ($answer =~ /^enc/) {
my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);	my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);
Line 620 sub nonblock {	Line 741 sub nonblock {
or die "Can't make socket nonblocking: $!\n";	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

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Removed from v.1.18
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	Added in v.1.28