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Diff for /loncom/Attic/lonc between versions 1.13 and 1.22

version 1.13, 2001/01/10 17:53:51	version 1.22, 2001/11/29 18:57:46
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
	# 01/10/01 Scott Harrison
	# 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
#	#
# based on nonforker from Perl Cookbook	# based on nonforker from Perl Cookbook
# - server who multiplexes without forking	# - server who multiplexes without forking
Line 28 use Fcntl;	Line 54 use Fcntl;
use Tie::RefHash;	use Tie::RefHash;
use Crypt::IDEA;	use Crypt::IDEA;

	my $status='';
	my $lastlog='';

# grabs exception and records it to log before exiting	# grabs exception and records it to log before exiting
sub catchexception {	sub catchexception {
my ($signal)=@_;	my ($signal)=@_;
Line 39 sub catchexception {	Line 68 sub catchexception {
die($@);	die($@);
}	}

$childmaxattempts=10;	$childmaxattempts=5;

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

Line 64 my $wwwid=getpwnam('www');	Line 93 my $wwwid=getpwnam('www');
if ($wwwid!=$<) {	if ($wwwid!=$<) {
$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";	$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
$subj="LON: $perlvar{'lonHostID'} User ID mismatch";	$subj="LON: $perlvar{'lonHostID'} User ID mismatch";
system("echo 'User ID mismatch. loncron must be run as user www.' \|\	system("echo 'User ID mismatch. lonc must be run as user www.' \|\
mailto $emailto -s '$subj' > /dev/null");	mailto $emailto -s '$subj' > /dev/null");
exit 1;	exit 1;
}	}
Line 114 sub REAPER { # ta	Line 143 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;	map {
	$wasserver=$children{$_};
	&status("Closing $wasserver");
	&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
	&status("Kill PID $_ for $wasserver");
	kill ('INT',$_);
	} keys %children;
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 123 sub HUNTSMAN { # si	Line 158 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;	map {
	$wasserver=$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'};
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');
	map {
	sleep 1;
	unless (kill 'USR1' => $_) {
	&logthis ('Child '.$_.' 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) {	foreach $thisserver (keys %hostip) {
Line 139 sub USRMAN {	Line 193 sub USRMAN {
." >$answer<");	." >$answer<");
}	}
%childatt=();	%childatt=();
	&checkchildren();
}	}

# -------------------------------------------------- Non-critical communication	# -------------------------------------------------- Non-critical communication
Line 151 sub subreply {	Line 206 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 167 sub logthis {	Line 232 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 179 sub logperm {	Line 245 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 202 $SIG{HUP}=$SIG{USR1}='IGNORE';	Line 293 $SIG{HUP}=$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);	make_new_child($thisserver);
}	}
Line 216 $SIG{USR1} = \&USRMAN;	Line 309 $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) {
$childatt{$thisserver}++;	$childatt{$thisserver}++;
&logthis(	&logthis(
"<font color=yellow>INFO: Trying to reconnect for $thisserver "	"<font color=yellow>INFO: Trying to reconnect for $thisserver "
Line 255 sub make_new_child {	Line 350 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 265 sub make_new_child {	Line 361 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 => $perlvar{'londPort'},
Line 278 unless (	Line 378 unless (
sleep($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.$perlvar{'lonHostID'};
Line 313 if ($cipher=new IDEA $cipherkey) {	Line 440 if ($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);
Line 321 if ($cipher=new IDEA $cipherkey) {	Line 448 if ($cipher=new IDEA $cipherkey) {
closedir(DIRHANDLE);	closedir(DIRHANDLE);
my $dfname;	my $dfname;
map {	map {
	&status("Sending delayed $conserver $_");
$dfname="$path/$_";	$dfname="$path/$_";
&logthis($dfname);	&logthis($dfname);
my $wcmd;	my $wcmd;
Line 343 if ($cipher=new IDEA $cipherkey) {	Line 471 if ($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");
Line 355 if ($cipher=new IDEA $cipherkey) {	Line 491 if ($cipher=new IDEA $cipherkey) {
} @allbuffered;	} @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 392 while (1) {	Line 529 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 411 while (1) {	Line 548 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 441 while (1) {	Line 579 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 490 sub handle {	Line 633 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 513 sub handle {	Line 675 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

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>

500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Removed from v.1.13
changed lines
	Added in v.1.22