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Diff for /loncom/Attic/lonc between versions 1.6 and 1.26

version 1.6, 2000/02/10 23:20:13	version 1.26, 2002/02/19 21:12:22
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 12	Line 36

# 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,	# 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,
# 10/8,10/9,10/15,11/18,12/22,	# 10/8,10/9,10/15,11/18,12/22,
# 2/8 Gerd Kortemeyer	# 2/8,7/25 Gerd Kortemeyer
	# 12/05 Scott Harrison
	# 12/05 Gerd Kortemeyer
	# YEAR=2001
	# 01/10/01 Scott Harrison
	# 03/14/01,03/15,06/12,11/26,11/27,11/28 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 24 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 $lastlog='';

	# grabs exception and records it to log before exiting
	sub catchexception {
	my ($signal)=@_;
	$SIG{'QUIT'}='DEFAULT';
	$SIG{__DIE__}='DEFAULT';
	&logthis("<font color=red>CRITICAL: "
	."ABNORMAL EXIT. Child $$ for server $wasserver died through "
	."\"$signal\" with this parameter->[$@]</font>");
	die($@);
	}

$childmaxattempts=10;	$childmaxattempts=5;

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

	sub online {
	my $host=shift;
	my $p=Net::Ping->new("tcp",10);
	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

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

# ------------------------------------ Read httpd access.conf and get variables	# ------------------------------------ Read httpd access.conf and get variables

Line 40 while ($configline=<CONFIG>) {	Line 132 while ($configline=<CONFIG>) {
}	}
close(CONFIG);	close(CONFIG);

	# ----------------------------- Make sure this process is running from user=www
	my $wwwid=getpwnam('www');
	if ($wwwid!=$<) {
	$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
	$subj="LON: $perlvar{'lonHostID'} User ID mismatch";
	system("echo 'User ID mismatch. lonc must be run as user www.' \|\
	mailto $emailto -s '$subj' > /dev/null");
	exit 1;
	}

	# --------------------------------------------- Check if other instance running

	my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid";

	if (-e $pidfile) {
	my $lfh=IO::File->new("$pidfile");
	my $pide=<$lfh>;
	chomp($pide);
	if (kill 0 => $pide) { die "already running"; }
	}

# ------------------------------------------------------------- Read hosts file	# ------------------------------------------------------------- Read hosts file

open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") \|\| die "Can't read host file";	open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") \|\| die "Can't read host file";
Line 74 sub REAPER { # ta	Line 187 sub REAPER { # ta

sub HUNTSMAN { # signal handler for SIGINT	sub HUNTSMAN { # signal handler for SIGINT
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children	local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
kill 'INT' => keys %children;	foreach (keys %children) {
	$wasserver=$children{$_};
	&status("Closing $wasserver");
	&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
	&status("Kill PID $_ for $wasserver");
	kill ('INT',$_);
	}
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 83 sub HUNTSMAN { # si	Line 202 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
kill 'INT' => keys %children;	foreach (keys %children) {
	$wasserver=$children{$_};
	&status("Closing $wasserver");
	&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
	&status("Kill PID $_ for $wasserver");
	kill ('INT',$_);
	}
&logthis("<font color=red>CRITICAL: Restarting</font>");	&logthis("<font color=red>CRITICAL: Restarting</font>");
	unlink("$execdir/logs/lonc.pid");
my $execdir=$perlvar{'lonDaemons'};	my $execdir=$perlvar{'lonDaemons'};
exec("$execdir/lonc"); # here we go again	exec("$execdir/lonc"); # here we go again
}	}

	sub checkchildren {
	&initnewstatus();
	&logstatus();
	&logthis('Going to check on the children');
	foreach (sort keys %children) {
	sleep 1;
	unless (kill 'USR1' => $_) {
	&logthis ('Child '.$_.' is dead');
	&logstatus($$.' is dead');
	}
	}
	}

sub USRMAN {	sub USRMAN {
&logthis("USR1: Trying to establish connections again");	&logthis("USR1: Trying to establish connections again");
foreach $thisserver (keys %hostip) {	foreach $thisserver (keys %hostip) {
Line 98 sub USRMAN {	Line 237 sub USRMAN {
." >$answer<");	." >$answer<");
}	}
%childatt=();	%childatt=();
	&checkchildren();
}	}

# -------------------------------------------------- Non-critical communication	# -------------------------------------------------- Non-critical communication
Line 110 sub subreply {	Line 250 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 126 sub logthis {	Line 276 sub logthis {
my $fh=IO::File->new(">>$execdir/logs/lonc.log");	my $fh=IO::File->new(">>$execdir/logs/lonc.log");
my $now=time;	my $now=time;
my $local=localtime($now);	my $local=localtime($now);
	$lastlog=$local.': '.$message;
print $fh "$local ($$): $message\n";	print $fh "$local ($$): $message\n";
}	}

Line 138 sub logperm {	Line 289 sub logperm {
my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");	my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
print $fh "$now:$message:$local\n";	print $fh "$now:$message:$local\n";
}	}
	# ------------------------------------------------------------------ Log status

	sub logstatus {
	my $docdir=$perlvar{'lonDocRoot'};
	my $fh=IO::File->new(">>$docdir/lon-status/loncstatus.txt");
	print $fh $$."\t".$status."\t".$lastlog."\n";
	}

	sub initnewstatus {
	my $docdir=$perlvar{'lonDocRoot'};
	my $fh=IO::File->new(">$docdir/lon-status/loncstatus.txt");
	my $now=time;
	my $local=localtime($now);
	print $fh "LONC status $local - parent $$\n\n";
	}

	# -------------------------------------------------------------- Status setting

	sub status {
	my $what=shift;
	my $now=time;
	my $local=localtime($now);
	$status=$local.': '.$what;
	}


# ---------------------------------------------------- Fork once and dissociate	# ---------------------------------------------------- Fork once and dissociate

Line 161 $SIG{HUP}=$SIG{USR1}='IGNORE';	Line 337 $SIG{HUP}=$SIG{USR1}='IGNORE';

# Fork off our children, one for every server	# Fork off our children, one for every server

	&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 175 $SIG{USR1} = \&USRMAN;	Line 355 $SIG{USR1} = \&USRMAN;

# And maintain the population.	# And maintain the population.
while (1) {	while (1) {
	&status("Sleeping");
sleep; # wait for a signal (i.e., child's death)	sleep; # wait for a signal (i.e., child's death)
# See who died and start new one	# See who died and start new one
	&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 214 sub make_new_child {	Line 402 sub make_new_child {
} 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
	$SIG{USR1}= \&logstatus;

# 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";
Line 224 sub make_new_child {	Line 413 sub make_new_child {
$port = "$perlvar{'lonSockDir'}/$conserver";	$port = "$perlvar{'lonSockDir'}/$conserver";

unlink($port);	unlink($port);

# ---------------------------------------------------- Client to network server	# ---------------------------------------------------- Client to network server

	&status("Opening TCP: $conserver");

unless (	unless (
$remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},	$remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},
PeerPort => $perlvar{'londPort'},	PeerPort => $perlvar{'londPort'},
Line 237 unless (	Line 430 unless (
sleep($st);	sleep($st);
exit;	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";	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') {
	my $st=120+int(rand(240));
	&logthis(
	"<font color=blue>WARNING: Init failed $conserver ($st secs)</font>");
	sleep($st);
	exit;
	}
sleep 5;	sleep 5;
	&status("Ponging $conserver");
print $remotesock "pong\n";	print $remotesock "pong\n";
$answer=<$remotesock>;	$answer=<$remotesock>;
chomp($answer);	chomp($answer);
&logthis("Pong reply for $conserver: >$answer<");	&logthis("Pong reply for $conserver: >$answer<");
# ----------------------------------------------------------- Initialize cipher	# ----------------------------------------------------------- Initialize cipher

	&status("Initialize cipher: $conserver");
print $remotesock "ekey\n";	print $remotesock "ekey\n";
my $buildkey=<$remotesock>;	my $buildkey=<$remotesock>;
my $key=$conserver.$perlvar{'lonHostID'};	my $key=$conserver.$perlvar{'lonHostID'};
Line 261 $key=$key.$buildkey.$key.$buildkey.$key.	Line 481 $key=$key.$buildkey.$key.$buildkey.$key.
$key=substr($key,0,32);	$key=substr($key,0,32);
my $cipherkey=pack("H32",$key);	my $cipherkey=pack("H32",$key);
if ($cipher=new IDEA $cipherkey) {	if ($cipher=new IDEA $cipherkey) {
&logthis("Secure connection inititalized: $conserver");	&logthis("Secure connection initialized: $conserver");
} else {	} else {
my $st=120+int(rand(240));	my $st=120+int(rand(240));
&logthis(	&logthis(
Line 272 if ($cipher=new IDEA $cipherkey) {	Line 492 if ($cipher=new IDEA $cipherkey) {
}	}

# ----------------------------------------- We're online, send delayed messages	# ----------------------------------------- We're online, send delayed messages
	&status("Checking for delayed messages");
my @allbuffered;	my @allbuffered;
my $path="$perlvar{'lonSockDir'}/delayed";	my $path="$perlvar{'lonSockDir'}/delayed";
opendir(DIRHANDLE,$path);	opendir(DIRHANDLE,$path);
@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 $_");
$dfname="$path/$_";	$dfname="$path/$_";
&logthis($dfname);	&logthis($dfname);
my $wcmd;	my $wcmd;
Line 302 if ($cipher=new IDEA $cipherkey) {	Line 523 if ($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");
unless (	unless (
$server = IO::Socket::UNIX->new(Local => $port,	$server = IO::Socket::UNIX->new(Local => $port,
Type => SOCK_STREAM,	Type => SOCK_STREAM,
Line 351 while (1) {	Line 581 while (1) {
# check for new information on the connections we have	# check for new information on the connections we have

# anything to read or accept?	# anything to read or accept?
foreach $client ($select->can_read(1)) {	foreach $client ($select->can_read(0.1)) {

if ($client == $server) {	if ($client == $server) {
# accept a new connection	# accept a new connection
	&status("Accept new connection: $conserver");
$client = $server->accept();	$client = $server->accept();
$select->add($client);	$select->add($client);
nonblock($client);	nonblock($client);
Line 370 while (1) {	Line 600 while (1) {
delete $outbuffer{$client};	delete $outbuffer{$client};
delete $ready{$client};	delete $ready{$client};

	&status("Idle $conserver");
$select->remove($client);	$select->remove($client);
close $client;	close $client;
next;	next;
Line 400 while (1) {	Line 631 while (1) {
$rv = $client->send($outbuffer{$client}, 0);	$rv = $client->send($outbuffer{$client}, 0);
unless (defined $rv) {	unless (defined $rv) {
# Whine, but move on.	# Whine, but move on.
warn "I was told I could write, but I can't.\n";	&logthis("I was told I could write, but I can't.\n");
next;	next;
}	}
	$errno=$!;
if (($rv == length $outbuffer{$client}) \|\|	if (($rv == length $outbuffer{$client}) \|\|
($! == POSIX::EWOULDBLOCK)) {	($errno == POSIX::EWOULDBLOCK) \|\| ($errno == 0)) {
substr($outbuffer{$client}, 0, $rv) = '';	substr($outbuffer{$client}, 0, $rv) = '';
delete $outbuffer{$client} unless length $outbuffer{$client};	delete $outbuffer{$client} unless length $outbuffer{$client};
} else {	} else {
# Couldn't write all the data, and it wasn't because	# Couldn't write all the data, and it wasn't because
# it would have blocked. Shutdown and move on.	# it would have blocked. Shutdown and move on.

	&logthis("Dropping data with ".$errno.": ".
	length($outbuffer{$client}).", $rv");

delete $inbuffer{$client};	delete $inbuffer{$client};
delete $outbuffer{$client};	delete $outbuffer{$client};
delete $ready{$client};	delete $ready{$client};
Line 449 sub handle {	Line 685 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");
print $remotesock "$request";	print $remotesock "$request";
	&status("Waiting for reply from $conserver: $request");
$answer=<$remotesock>;	$answer=<$remotesock>;
	&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 472 sub handle {	Line 727 sub handle {
# ===================================================== Done processing request	# ===================================================== Done processing request
}	}
delete $ready{$client};	delete $ready{$client};
	&status("Completed $conserver: $request");
# -------------------------------------------------------------- End non-forker	# -------------------------------------------------------------- End non-forker
}	}
# ---------------------------------------------------------- End make_new_child	# ---------------------------------------------------------- End make_new_child
Line 489 sub nonblock {	Line 745 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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	Added in v.1.26