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Diff for /loncom/loncnew between versions 1.12 and 1.30

version 1.12, 2003/07/02 01:12:35	version 1.30, 2003/10/27 10:09:21
Line 7	Line 7
# Copyright Michigan State University Board of Trustees	# Copyright Michigan State University Board of Trustees
#	#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).	# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#	## LON-CAPA is free software; you can redistribute it and/or modify
# 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	# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or	# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.	# (at your option) any later version.
Line 27	Line 26
# http://www.lon-capa.org/	# http://www.lon-capa.org/
#	#
#	#
# new lonc handles n requestors spread out bver m connections to londs.	# new lonc handles n request out bver m connections to londs.
# This module is based on the Event class.	# This module is based on the Event class.
# Development iterations:	# Development iterations:
# - Setup basic event loop. (done)	# - Setup basic event loop. (done)
Line 46	Line 45

# Change log:	# Change log:
# $Log$	# $Log$
# Revision 1.12 2003/07/02 01:12:35 foxr	# Revision 1.30 2003/10/27 10:09:21 foxr
# - Add some debugging to killthemall	# Tighten up a few compares to eq and flip a few debug levels around... nothing
# - Add better error handling to LondReadable	# critical
# - Remove tick logging in the timer handler.	#
	# Revision 1.29 2003/10/21 14:24:42 foxr
	# Fix little typo that may explain growth of connections
	#
	# Revision 1.28 2003/10/14 15:36:21 albertel
	# - making it easier to run loncnew,
	# /etc/init.d/loncontrol startnew
	# /etc/init.d/loncontrol restartnew
	# will now start loncnew in place of lonc
	#
	# Revision 1.27 2003/10/07 11:23:03 foxr
	# Installed and tested code to process reinit in parent server.
	#
	# Revision 1.26 2003/09/30 11:11:17 foxr
	# Add book-keeping hashes to support the re-init procedure.
	#
	# Revision 1.25 2003/09/23 11:22:14 foxr
	# Tested ability to receive sigusr2 This is now logged and must be
	# properly implemented as a re-read of hosts and re-init of appropriate
	# children.
	#
	# Revision 1.24 2003/09/16 09:46:42 foxr
	# Added skeletal infrastructure to support SIGUSR2 update hosts request.
	#
	# Revision 1.23 2003/09/15 09:24:49 foxr
	# Add use strict and fix all the fallout from that.
	#
	# Revision 1.22 2003/09/02 10:34:47 foxr
	# - Fix errors in host dead detection logic (too many cases where the
	# retries left were not getting incremented or just not checked).
	# - Added some additional status to the ps axuww display:
	# o Remaining retries on a host.
	# o >>> DEAD <<< indicator if I've given up on a host.
	# - Tested the SIGHUP will reset the retries remaining count (thanks to
	# the above status stuff, and get allow the loncnew to re-try again
	# on the host (thanks to the log).
	#
	# Revision 1.21 2003/08/26 09:19:51 foxr
	# How embarrassing... put in the SocketTimeout function in loncnew and forgot
	# to actually hook it into the LondTransaction. Added this to MakeLondConnection
	# where it belongs... hopefully transactions (not just connection attempts) will
	# timeout more speedily than the socket errors will catch it.
	#
	# Revision 1.20 2003/08/25 18:48:11 albertel
	# - fixing a forgotten ;
	#
	# Revision 1.19 2003/08/19 09:31:46 foxr
	# Get socket directory from configuration rather than the old hard coded test
	# way that I forgot to un-hard code.
	#
	# Revision 1.18 2003/08/06 09:52:29 foxr
	# Also needed to remember to fail in-flight transactions if their sends fail.
	#
	# Revision 1.17 2003/08/03 00:44:31 foxr
	# 1. Correct handling of connection failure: Assume it means the host is
	# unreachable and fail all of the queued transactions. Note that the
	# inflight transactions should fail on their own time due either to timeout
	# or send/receive failures.
	# 2. Correct handling of logs for forced death signals. Pull the signal
	# from the event watcher.
	#
	# Revision 1.16 2003/07/29 02:33:05 foxr
	# Add SIGINT processing to child processes to toggle annoying trace mode
	# on/off.. will try to use this to isolate the compute boud process issue.
	#
	# Revision 1.15 2003/07/15 02:07:05 foxr
	# Added code for lonc/lond transaction timeouts. Who knows if it works right.
	# The intent is for a timeout to fail any transaction in progress and kill
	# off the sockt that timed out.
	#
	# Revision 1.14 2003/07/03 02:10:18 foxr
	# Get all of the signals to work correctly.
	#
	# Revision 1.13 2003/07/02 01:31:55 foxr
	# Added kill -HUP logic (restart).
#	#
# Revision 1.11 2003/06/25 01:54:44 foxr	# Revision 1.11 2003/06/25 01:54:44 foxr
# Fix more problems with transaction failure.	# Fix more problems with transaction failure.
Line 57	Line 130
# Revision 1.10 2003/06/24 02:46:04 foxr	# Revision 1.10 2003/06/24 02:46:04 foxr
# Put a limit on the number of times we'll retry a connection.	# Put a limit on the number of times we'll retry a connection.
# Start getting the signal stuff put in as well...note that need to get signals	# Start getting the signal stuff put in as well...note that need to get signals
# going or else 6the client will permanently give up on dead servers.	# going or else the client will permanently give up on dead servers.
#	#
# Revision 1.9 2003/06/13 02:38:43 foxr	# Revision 1.9 2003/06/13 02:38:43 foxr
# Add logging in 'expected format'	# Add logging in 'expected format'
Line 71	Line 144
# complete coding to support deferred transactions.	# complete coding to support deferred transactions.
#	#
#	#
	use strict;
use lib "/home/httpd/lib/perl/";	use lib "/home/httpd/lib/perl/";
use lib "/home/foxr/newloncapa/types";	use lib "/home/foxr/newloncapa/types";
use Event qw(:DEFAULT );	use Event qw(:DEFAULT );
Line 95 use LONCAPA::HashIterator;	Line 168 use LONCAPA::HashIterator;
#	#
# Disable all signals we might receive from outside for now.	# Disable all signals we might receive from outside for now.
#	#
$SIG{QUIT} = IGNORE;
$SIG{HUP} = IGNORE;
$SIG{USR1} = IGNORE;
$SIG{INT} = IGNORE;
$SIG{CHLD} = IGNORE;
$SIG{__DIE__} = IGNORE;


# Read the httpd configuration file to get perl variables	# Read the httpd configuration file to get perl variables
Line 113 my %perlvar = %{$perlvarref};	Line 180 my %perlvar = %{$perlvarref};
# parent and shared variables.	# parent and shared variables.

my %ChildHash; # by pid -> host.	my %ChildHash; # by pid -> host.
	my %HostToPid; # By host -> pid.
	my %HostHash; # by loncapaname -> IP.


my $MaxConnectionCount = 10; # Will get from config later.	my $MaxConnectionCount = 10; # Will get from config later.
my $ClientConnection = 0; # Uniquifier for client events.	my $ClientConnection = 0; # Uniquifier for client events.

my $DebugLevel = 0;	my $DebugLevel = 0;
	my $NextDebugLevel= 2; # So Sigint can toggle this.
my $IdleTimeout= 3600; # Wait an hour before pruning connections.	my $IdleTimeout= 3600; # Wait an hour before pruning connections.

#	#
# The variables below are only used by the child processes.	# The variables below are only used by the child processes.
#	#
my $RemoteHost; # Name of host child is talking to.	my $RemoteHost; # Name of host child is talking to.
my $UnixSocketDir= "/home/httpd/sockets";	my $UnixSocketDir= $perlvar{'lonSockDir'};
my $IdleConnections = Stack->new(); # Set of idle connections	my $IdleConnections = Stack->new(); # Set of idle connections
my %ActiveConnections; # Connections to the remote lond.	my %ActiveConnections; # Connections to the remote lond.
my %ActiveTransactions; # LondTransactions in flight.	my %ActiveTransactions; # LondTransactions in flight.
Line 134 my $WorkQueue = Queue->new(); # Qu	Line 204 my $WorkQueue = Queue->new(); # Qu
my $ConnectionCount = 0;	my $ConnectionCount = 0;
my $IdleSeconds = 0; # Number of seconds idle.	my $IdleSeconds = 0; # Number of seconds idle.
my $Status = ""; # Current status string.	my $Status = ""; # Current status string.
my $ConnectionRetries=5; # Number of connection retries allowed.	my $RecentLogEntry = "";
my $ConnectionRetriesLeft=5; # Number of connection retries remaining.	my $ConnectionRetries=2; # Number of connection retries allowed.
	my $ConnectionRetriesLeft=2; # Number of connection retries remaining.

#	#
# The hash below gives the HTML format for log messages	# The hash below gives the HTML format for log messages
Line 210 sub Log {	Line 281 sub Log {
my $execdir = $perlvar{'lonDaemons'};	my $execdir = $perlvar{'lonDaemons'};
my $fh = IO::File->new(">>$execdir/logs/lonc.log");	my $fh = IO::File->new(">>$execdir/logs/lonc.log");
my $msg = sprintf($finalformat, $message);	my $msg = sprintf($finalformat, $message);
	$RecentLogEntry = $msg;
print $fh $msg;	print $fh $msg;


Line 232 sub GetPeername {	Line 304 sub GetPeername {
my $peerip;	my $peerip;
if($AdrFamily == AF_INET) {	if($AdrFamily == AF_INET) {
($peerport, $peerip) = sockaddr_in($peer);	($peerport, $peerip) = sockaddr_in($peer);
my $peername = gethostbyaddr($iaddr, $AdrFamily);	my $peername = gethostbyaddr($peerip, $AdrFamily);
return $peername;	return $peername;
} elsif ($AdrFamily == AF_UNIX) {	} elsif ($AdrFamily == AF_UNIX) {
my $peerfile;	my $peerfile;
Line 253 sub Debug {	Line 325 sub Debug {
my $level = shift;	my $level = shift;
my $message = shift;	my $message = shift;
if ($level <= $DebugLevel) {	if ($level <= $DebugLevel) {
print $message." host = ".$RemoteHost."\n";	Log("INFO", "-Debug- $message host = $RemoteHost");
}	}
}	}

Line 283 sub ShowStatus {	Line 355 sub ShowStatus {

=pod	=pod

	=head 2 SocketTimeout

	Called when an action on the socket times out. The socket is
	destroyed and any active transaction is failed.


	=cut
	sub SocketTimeout {
	my $Socket = shift;

	KillSocket($Socket); # A transaction timeout also counts as
	# a connection failure:
	$ConnectionRetriesLeft--;
	}

	=pod

=head2 Tick	=head2 Tick

Invoked each timer tick.	Invoked each timer tick.
Line 292 Invoked each timer tick.	Line 381 Invoked each timer tick.

sub Tick {	sub Tick {
my $client;	my $client;
ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount);	if($ConnectionRetriesLeft > 0) {
	ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount
	." Retries remaining: ".$ConnectionRetriesLeft);
	} else {
	ShowStatus(GetServerHost()." >> DEAD <<");
	}
# Is it time to prune connection count:	# Is it time to prune connection count:


Line 301 sub Tick {	Line 394 sub Tick {
($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?	($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?
$IdleSeconds++;	$IdleSeconds++;
if($IdleSeconds > $IdleTimeout) { # Prune a connection...	if($IdleSeconds > $IdleTimeout) { # Prune a connection...
$Socket = $IdleConnections->pop();	my $Socket = $IdleConnections->pop();
KillSocket($Socket);	KillSocket($Socket);
}	}
} else {	} else {
$IdleSeconds = 0; # Reset idle count if not idle.	$IdleSeconds = 0; # Reset idle count if not idle.
}	}
	#
	# For each inflight transaction, tick down its timeout counter.
	#
	foreach my $item (keys %ActiveTransactions) {
	my $Socket = $ActiveTransactions{$item}->getServer();
	$Socket->Tick();
	}
# Do we have work in the queue, but no connections to service them?	# Do we have work in the queue, but no connections to service them?
# If so, try to make some new connections to get things going again.	# If so, try to make some new connections to get things going again.
#	#
Line 317 sub Tick {	Line 416 sub Tick {
if ($ConnectionRetriesLeft > 0) {	if ($ConnectionRetriesLeft > 0) {
my $Connections = ($Requests <= $MaxConnectionCount) ?	my $Connections = ($Requests <= $MaxConnectionCount) ?
$Requests : $MaxConnectionCount;	$Requests : $MaxConnectionCount;
Debug(1,"Work but no connections, start ".$Connections." of them");	Debug(5,"Work but no connections, start ".$Connections." of them");
for ($i =0; $i < $Connections; $i++) {	my $successCount = 0;
MakeLondConnection();	for (my $i =0; $i < $Connections; $i++) {
	$successCount += MakeLondConnection();
	}
	if($successCount == 0) { # All connections failed:
	Debug(5,"Work in queue failed to make any connectiouns\n");
	EmptyQueue(); # Fail pending transactions with con_lost.
}	}
} else {	} else {
Debug(1,"Work in queue, but gave up on connections..flushing\n");	ShowStatus(GetServerHost()." >>> DEAD!!! <<<");
	Debug(5,"Work in queue, but gave up on connections..flushing\n");
EmptyQueue(); # Connections can't be established.	EmptyQueue(); # Connections can't be established.
}	}

Line 369 sub ServerToIdle {	Line 474 sub ServerToIdle {
my $Socket = shift; # Get the socket.	my $Socket = shift; # Get the socket.
delete($ActiveTransactions{$Socket}); # Server has no transaction	delete($ActiveTransactions{$Socket}); # Server has no transaction

&Debug(6, "Server to idle");	&Debug(5, "Server to idle");

# If there's work to do, start the transaction:	# If there's work to do, start the transaction:

$reqdata = $WorkQueue->dequeue(); # This is a LondTransaction	my $reqdata = $WorkQueue->dequeue(); # This is a LondTransaction
unless($reqdata eq undef) {	if ($reqdata ne undef) {
Debug(9, "Queue gave request data: ".$reqdata->getRequest());	Debug(5, "Queue gave request data: ".$reqdata->getRequest());
&StartRequest($Socket, $reqdata);	&StartRequest($Socket, $reqdata);

} else {	} else {

# There's no work waiting, so push the server to idle list.	# There's no work waiting, so push the server to idle list.
&Debug(8, "No new work requests, server connection going idle");	&Debug(5, "No new work requests, server connection going idle");
$IdleConnections->push($Socket);	$IdleConnections->push($Socket);
}	}
}	}
Line 427 sub ClientWritable {	Line 532 sub ClientWritable {
# request.	# request.

&Debug(9,"Send result is ".$result." Defined: ".defined($result));	&Debug(9,"Send result is ".$result." Defined: ".defined($result));
if(defined($result)) {	if($result ne undef) {
&Debug(9, "send result was defined");	&Debug(9, "send result was defined");
if($result == length($Data)) { # Entire string sent.	if($result == length($Data)) { # Entire string sent.
&Debug(9, "ClientWritable data all written");	&Debug(9, "ClientWritable data all written");
Line 445 sub ClientWritable {	Line 550 sub ClientWritable {

} else { # Partial string sent.	} else { # Partial string sent.
$Watcher->data(substr($Data, $result));	$Watcher->data(substr($Data, $result));
	if($result == 0) { # client hung up on us!!
	Log("INFO", "lonc pipe client hung up on us!");
	$Watcher->cancel;
	$Socket->shutdown(2);
	$Socket->close();
	}
}	}

} else { # Error of some sort...	} else { # Error of some sort...
Line 492 The transaction that is being completed.	Line 603 The transaction that is being completed.
=cut	=cut

sub CompleteTransaction {	sub CompleteTransaction {
&Debug(6,"Complete transaction");	&Debug(5,"Complete transaction");
my $Socket = shift;	my $Socket = shift;
my $Transaction = shift;	my $Transaction = shift;

Line 501 sub CompleteTransaction {	Line 612 sub CompleteTransaction {
StartClientReply($Transaction, $data);	StartClientReply($Transaction, $data);
} else { # Delete deferred transaction file.	} else { # Delete deferred transaction file.
Log("SUCCESS", "A delayed transaction was completed");	Log("SUCCESS", "A delayed transaction was completed");
LogPerm("S:$Client:".$Transaction->getRequest());	LogPerm("S:$Transaction->getClient() :".$Transaction->getRequest());
unlink $Transaction->getFile();	unlink $Transaction->getFile();
}	}
}	}
Line 531 sub StartClientReply {	Line 642 sub StartClientReply {
&Debug(8," Reply was: ".$data);	&Debug(8," Reply was: ".$data);
my $Serial = $ActiveClients{$Client};	my $Serial = $ActiveClients{$Client};
my $desc = sprintf("Connection to lonc client %d",	my $desc = sprintf("Connection to lonc client %d",

$Serial);	$Serial);
Event->io(fd => $Client,	Event->io(fd => $Client,
poll => "w",	poll => "w",
Line 562 Parameters:	Line 672 Parameters:

sub FailTransaction {	sub FailTransaction {
my $transaction = shift;	my $transaction = shift;
	Log("WARNING", "Failing transaction ".$transaction->getRequest());
Debug(1, "Failing transaction: ".$transaction->getRequest());	Debug(1, "Failing transaction: ".$transaction->getRequest());
if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.	if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.
my $client = $transaction->getClient();	my $client = $transaction->getClient();
Debug(1," Replying con_lost to ".$transaction->getRequest());	Debug(1," Replying con_lost to ".$transaction->getRequest());
StartClientReply($transaction, "con_lost\n");	StartClientReply($transaction, "con_lost\n");
}	}
	if($ConnectionRetriesLeft <= 0) {
	Log("CRITICAL", "Host marked dead: ".GetServerHost());
	}

}	}

Line 579 sub FailTransaction {	Line 693 sub FailTransaction {

=cut	=cut
sub EmptyQueue {	sub EmptyQueue {
	$ConnectionRetriesLeft--; # Counts as connection failure too.
while($WorkQueue->Count()) {	while($WorkQueue->Count()) {
my $request = $WorkQueue->dequeue(); # This is a transaction	my $request = $WorkQueue->dequeue(); # This is a transaction
FailTransaction($request);	FailTransaction($request);
Line 593 Close all connections open on lond prior	Line 708 Close all connections open on lond prior

=cut	=cut
sub CloseAllLondConnections {	sub CloseAllLondConnections {
foreach $Socket (keys %ActiveConnections) {	foreach my $Socket (keys %ActiveConnections) {
KillSocket($Socket);	KillSocket($Socket);
}	}
}	}
Line 624 nonzero if we are allowed to create a ne	Line 739 nonzero if we are allowed to create a ne
sub KillSocket {	sub KillSocket {
my $Socket = shift;	my $Socket = shift;

	Log("WARNING", "Shutting down a socket");
$Socket->Shutdown();	$Socket->Shutdown();

# If the socket came from the active connection set,	# If the socket came from the active connection set,
Line 644 sub KillSocket {	Line 760 sub KillSocket {
# work queue, the work all gets failed with con_lost.	# work queue, the work all gets failed with con_lost.
#	#
if($ConnectionCount == 0) {	if($ConnectionCount == 0) {
EmptyQueue;	EmptyQueue();
}	}
}	}

Line 713 sub LondReadable {	Line 829 sub LondReadable {
my $Socket = $Watcher->data;	my $Socket = $Watcher->data;
my $client = undef;	my $client = undef;

&Debug(6,"LondReadable called state = ".$State);	&Debug(6,"LondReadable called state = ".$Socket->GetState());


my $State = $Socket->GetState(); # All action depends on the state.	my $State = $Socket->GetState(); # All action depends on the state.

SocketDump(6, $Socket);	SocketDump(6, $Socket);
my $status = $Socket->Readable();	my $status = $Socket->Readable();

&Debug(2, "Socket->Readable returned: $status");	&Debug(2, "Socket->Readable returned: $status");

if($status != 0) {	if($status != 0) {
# bad return from socket read. Currently this means that	# bad return from socket read. Currently this means that
# The socket has become disconnected. We fail the transaction.	# The socket has become disconnected. We fail the transaction.

	Log("WARNING",
	"Lond connection lost.");
if(exists($ActiveTransactions{$Socket})) {	if(exists($ActiveTransactions{$Socket})) {
Debug(3,"Lond connection lost failing transaction");
FailTransaction($ActiveTransactions{$Socket});	FailTransaction($ActiveTransactions{$Socket});
}	}
$Watcher->cancel();	$Watcher->cancel();
KillSocket($Socket);	KillSocket($Socket);
	$ConnectionRetriesLeft--; # Counts as connection failure
return;	return;
}	}
SocketDump(6,$Socket);	SocketDump(6,$Socket);
Line 765 sub LondReadable {	Line 884 sub LondReadable {
} elsif ($State eq "Idle") {	} elsif ($State eq "Idle") {
# If necessary, complete a transaction and then go into the	# If necessary, complete a transaction and then go into the
# idle queue.	# idle queue.
	# Note that a trasition to idle indicates a live lond
	# on the other end so reset the connection retries.
	#
	$ConnectionRetriesLeft = $ConnectionRetries; # success resets the count
$Watcher->cancel();	$Watcher->cancel();
if(exists($ActiveTransactions{$Socket})) {	if(exists($ActiveTransactions{$Socket})) {
Debug(8,"Completing transaction!!");	Debug(5,"Completing transaction!!");
CompleteTransaction($Socket,	CompleteTransaction($Socket,
$ActiveTransactions{$Socket});	$ActiveTransactions{$Socket});
} else {	} else {
Line 877 sub LondWritable {	Line 1000 sub LondWritable {
# We'll treat this as if the socket got disconnected:	# We'll treat this as if the socket got disconnected:
Log("WARNING", "Connection to ".$RemoteHost.	Log("WARNING", "Connection to ".$RemoteHost.
" has been disconnected");	" has been disconnected");
	FailTransaction($ActiveTransactions{$Socket});
$Watcher->cancel();	$Watcher->cancel();
KillSocket($Socket);	KillSocket($Socket);
return;	return;
Line 976 sub QueueDelayed {	Line 1100 sub QueueDelayed {
Debug(4, "Delayed path: ".$path);	Debug(4, "Delayed path: ".$path);
opendir(DIRHANDLE, $path);	opendir(DIRHANDLE, $path);

@alldelayed = grep /\.$RemoteHost$/, readdir DIRHANDLE;	my @alldelayed = grep /\.$RemoteHost$/, readdir DIRHANDLE;
Debug(4, "Got ".$alldelayed." delayed files");
closedir(DIRHANDLE);	closedir(DIRHANDLE);
my $dfname;	my $dfname;
my $reqfile;	my $reqfile;
Line 1014 sub MakeLondConnection {	Line 1137 sub MakeLondConnection {
my $Connection = LondConnection->new(&GetServerHost(),	my $Connection = LondConnection->new(&GetServerHost(),
&GetServerPort());	&GetServerPort());

if($Connection == undef) { # Needs to be more robust later.	if($Connection eq undef) { # Needs to be more robust later.
Log("CRITICAL","Failed to make a connection with lond.");	Log("CRITICAL","Failed to make a connection with lond.");
$ConnectionRetriesLeft--;	$ConnectionRetriesLeft--;
return 0; # Failure.	return 0; # Failure.
} else {	} else {
$ConnectionRetriesLeft = $ConnectionRetries; # success resets the count
# The connection needs to have writability	# The connection needs to have writability
# monitored in order to send the init sequence	# monitored in order to send the init sequence
# that starts the whole authentication/key	# that starts the whole authentication/key
# exchange underway.	# exchange underway.
#	#
my $Socket = $Connection->GetSocket();	my $Socket = $Connection->GetSocket();
if($Socket == undef) {	if($Socket eq undef) {
die "did not get a socket from the connection";	die "did not get a socket from the connection";
} else {	} else {
&Debug(9,"MakeLondConnection got socket: ".$Socket);	&Debug(9,"MakeLondConnection got socket: ".$Socket);
}	}

	$Connection->SetTimeoutCallback(\&SocketTimeout);
$event = Event->io(fd => $Socket,
	my $event = Event->io(fd => $Socket,
poll => 'w',	poll => 'w',
cb => \&LondWritable,	cb => \&LondWritable,
data => $Connection,	data => $Connection,
Line 1089 sub StartRequest {	Line 1213 sub StartRequest {
$ActiveTransactions{$Lond} = $Request;	$ActiveTransactions{$Lond} = $Request;

$Lond->InitiateTransaction($Request->getRequest());	$Lond->InitiateTransaction($Request->getRequest());
$event = Event->io(fd => $Socket,	my $event = Event->io(fd => $Socket,
poll => "w",	poll => "w",
cb => \&LondWritable,	cb => \&LondWritable,
data => $Lond,	data => $Lond,
Line 1128 sub QueueTransaction {	Line 1252 sub QueueTransaction {

my $LondSocket = $IdleConnections->pop();	my $LondSocket = $IdleConnections->pop();
if(!defined $LondSocket) { # Need to queue request.	if(!defined $LondSocket) { # Need to queue request.
Debug(8,"Must queue...");	Debug(5,"Must queue...");
$WorkQueue->enqueue($requestData);	$WorkQueue->enqueue($requestData);
if($ConnectionCount < $MaxConnectionCount) {	if($ConnectionCount < $MaxConnectionCount) {
Debug(4,"Starting additional lond connection");	if($ConnectionRetriesLeft > 0) {
MakeLondConnection();	Debug(5,"Starting additional lond connection");
	if(MakeLondConnection() == 0) {
	EmptyQueue(); # Fail transactions, can't make connection.
	}
	} else {
	ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");
	EmptyQueue(); # It's worse than that ... he's dead Jim.
	}
}	}
} else { # Can start the request:	} else { # Can start the request:
Debug(8,"Can start...");	Debug(8,"Can start...");
Line 1163 sub ClientRequest {	Line 1294 sub ClientRequest {
my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);	my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
Debug(8, "rcv: data length = ".length($thisread)	Debug(8, "rcv: data length = ".length($thisread)
." read =".$thisread);	." read =".$thisread);
unless (defined $rv && length($thisread)) {	unless (defined $rv && length($thisread)) {
# Likely eof on socket.	# Likely eof on socket.
Debug(5,"Client Socket closed on lonc for ".$RemoteHost);	Debug(5,"Client Socket closed on lonc for ".$RemoteHost);
close($socket);	close($socket);
Line 1290 sub SetupLoncListener {	Line 1421 sub SetupLoncListener {
fd => $socket);	fd => $socket);
}	}

	=pod

	=head2 ChildStatus

	Child USR1 signal handler to report the most recent status
	into the status file.

	We also use this to reset the retries count in order to allow the
	client to retry connections with a previously dead server.
	=cut
	sub ChildStatus {
	my $event = shift;
	my $watcher = $event->w;

	Debug(2, "Reporting child status because : ".$watcher->data);
	my $docdir = $perlvar{'lonDocRoot'};
	my $fh = IO::File->new(">>$docdir/lon-status/loncstatus.txt");
	print $fh $$."\t".$RemoteHost."\t".$Status."\t".
	$RecentLogEntry."\n";
	$ConnectionRetriesLeft = $ConnectionRetries;
	}

=pod	=pod

=head2 SignalledToDeath	=head2 SignalledToDeath
Line 1300 Called in response to a signal that caus	Line 1453 Called in response to a signal that caus


sub SignalledToDeath {	sub SignalledToDeath {
Debug(2,"Signalled to death!");	my $event = shift;
my ($signal) = @_;	my $watcher= $event->w;

	Debug(2,"Signalled to death! via ".$watcher->data);
	my ($signal) = $watcher->data;
chomp($signal);	chomp($signal);
Log("CRITICAL", "Abnormal exit. Child $$ for $RemoteHost "	Log("CRITICAL", "Abnormal exit. Child $$ for $RemoteHost "
."died through "."\"$signal\"");	."died through "."\"$signal\"");
LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "	LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
."\"$signal\"");	."\"$signal\"");
die("Signal abnormal end");
exit 0;	exit 0;

}	}

	=head2 ToggleDebug

	This sub toggles trace debugging on and off.

	=cut

	sub ToggleDebug {
	my $Current = $DebugLevel;
	$DebugLevel = $NextDebugLevel;
	$NextDebugLevel = $Current;

	Log("SUCCESS", "New debugging level for $RemoteHost now $DebugLevel");

	}

=head2 ChildProcess	=head2 ChildProcess

This sub implements a child process for a single lonc daemon.	This sub implements a child process for a single lonc daemon.
Line 1320 This sub implements a child process for	Line 1491 This sub implements a child process for
sub ChildProcess {	sub ChildProcess {


# For now turn off signals.	#
	# Signals must be handled by the Event framework...
$SIG{QUIT} = \&SignalledToDeath;	#
$SIG{HUP} = IGNORE;
$SIG{USR1} = IGNORE;	Event->signal(signal => "QUIT",
$SIG{INT} = DEFAULT;	cb => \&SignalledToDeath,
$SIG{CHLD} = IGNORE;	data => "QUIT");
$SIG{__DIE__} = \&SignalledToDeath;	Event->signal(signal => "HUP",
	cb => \&ChildStatus,
	data => "HUP");
	Event->signal(signal => "USR1",
	cb => \&ChildStatus,
	data => "USR1");
	Event->signal(signal => "INT",
	cb => \&ToggleDebug,
	data => "INT");

SetupTimer();	SetupTimer();

Line 1339 sub ChildProcess {	Line 1518 sub ChildProcess {

# Setup the initial server connection:	# Setup the initial server connection:

# &MakeLondConnection(); // let first work requirest do it.	# &MakeLondConnection(); // let first work requirest do it.


Debug(9,"Entering event loop");	Debug(9,"Entering event loop");
Line 1357 sub CreateChild {	Line 1536 sub CreateChild {
my $host = shift;	my $host = shift;
$RemoteHost = $host;	$RemoteHost = $host;
Log("CRITICAL", "Forking server for ".$host);	Log("CRITICAL", "Forking server for ".$host);
$pid = fork;	my $pid = fork;
if($pid) { # Parent	if($pid) { # Parent
$ChildHash{$pid} = $RemoteHost;	$RemoteHost = "Parent";
	$ChildHash{$pid} = $host;
	$HostToPid{$host}= $pid;
sigprocmask(SIG_UNBLOCK, $sigset);	sigprocmask(SIG_UNBLOCK, $sigset);

} else { # child.	} else { # child.
ShowStatus("Connected to ".$RemoteHost);	ShowStatus("Connected to ".$RemoteHost);
$SIG{INT} = DEFAULT;	$SIG{INT} = 'DEFAULT';
sigprocmask(SIG_UNBLOCK, $sigset);	sigprocmask(SIG_UNBLOCK, $sigset);
ChildProcess; # Does not return.	ChildProcess; # Does not return.
}	}
Line 1401 if ($childpid != 0) {	Line 1582 if ($childpid != 0) {
#	#

ShowStatus("Parent writing pid file:");	ShowStatus("Parent writing pid file:");
$execdir = $perlvar{'lonDaemons'};	my $execdir = $perlvar{'lonDaemons'};
open (PIDSAVE, ">$execdir/logs/lonc.pid");	open (PIDSAVE, ">$execdir/logs/lonc.pid");
print PIDSAVE "$$\n";	print PIDSAVE "$$\n";
close(PIDSAVE);	close(PIDSAVE);



if (POSIX::setsid() < 0) {	if (POSIX::setsid() < 0) {
print "Could not create new session\n";	print "Could not create new session\n";
exit -1;	exit -1;
Line 1418 Log("CRITICAL", "--------------- Startin	Line 1601 Log("CRITICAL", "--------------- Startin
my $HostIterator = LondConnection::GetHostIterator;	my $HostIterator = LondConnection::GetHostIterator;
while (! $HostIterator->end()) {	while (! $HostIterator->end()) {

$hostentryref = $HostIterator->get();	my $hostentryref = $HostIterator->get();
CreateChild($hostentryref->[0]);	CreateChild($hostentryref->[0]);
	$HostHash{$hostentryref->[0]} = $hostentryref->[4];
$HostIterator->next();	$HostIterator->next();
}	}
$RemoteHost = "Parent Server";	$RemoteHost = "Parent Server";
Line 1432 ShowStatus("Parent keeping the flock");	Line 1616 ShowStatus("Parent keeping the flock");
# Set up parent signals:	# Set up parent signals:
#	#

$SIG{INT} = \&KillThemAll;	$SIG{INT} = \&Terminate;
$SIG{TERM} = \&KillThemAll;	$SIG{TERM} = \&Terminate;
	$SIG{HUP} = \&Restart;
	$SIG{USR1} = \&CheckKids;
	$SIG{USR2} = \&UpdateKids; # LonManage update request.

while(1) {	while(1) {
$deadchild = wait();	my $deadchild = wait();
if(exists $ChildHash{$deadchild}) { # need to restart.	if(exists $ChildHash{$deadchild}) { # need to restart.
$deadhost = $ChildHash{$deadchild};	my $deadhost = $ChildHash{$deadchild};
	delete($HostToPid{$deadhost});
delete($ChildHash{$deadchild});	delete($ChildHash{$deadchild});
Log("WARNING","Lost child pid= ".$deadchild.	Log("WARNING","Lost child pid= ".$deadchild.
"Connected to host ".$deadhost);	"Connected to host ".$deadhost);
Line 1448 while(1) {	Line 1635 while(1) {
}	}
}	}



	=pod

	=head1 CheckKids

	Since kids do not die as easily in this implementation
	as the previous one, there is no need to restart the
	dead ones (all dead kids get restarted when they die!!)
	The only thing this function does is to pass USR1 to the
	kids so that they report their status.

	=cut

	sub CheckKids {
	Debug(2, "Checking status of children");
	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";
	foreach my $pid (keys %ChildHash) {
	Debug(2, "Sending USR1 -> $pid");
	kill 'USR1' => $pid; # Tell Child to report status.
	sleep 1; # Wait so file doesn't intermix.
	}
	}

	=pod

	=head1 UpdateKids

	parent's SIGUSR2 handler. This handler:

	=item

	Rereads the hosts file.

	=item

	Kills off (via sigint) children for hosts that have disappeared.

	=item

	QUITs children for hosts that already exist (this just forces a status display
	and resets the connection retry count for that host.

	=item

	Starts new children for hosts that have been added to the hosts.tab file since
	the start of the master program and maintains them.

	=cut

	sub UpdateKids {

	Log("INFO", "Updating connections via SIGUSR2");

	# Just in case we need to kill our own lonc, we wait a few seconds to
	# give it a chance to receive and relay lond's response to the
	# re-init command.
	#

	sleep(2); # Wait a couple of seconds.

	my %hosts; # Indexed by loncapa hostname, value=ip.

	# Need to re-read the host table:


	LondConnection::ReadConfig();
	my $I = LondConnection::GetHostIterator;
	while (! $I->end()) {
	my $item = $I->get();
	$hosts{$item->[0]} = $item->[4];
	$I->next();
	}

	# The logic below is written for clarity not for efficiency.
	# Since I anticipate that this function is only rarely called, that's
	# appropriate. There are certainly ways to combine the loops below,
	# and anyone wishing to obscure the logic is welcome to go for it.
	# Note that we don't re-direct sigchild. Instead we do what's needed
	# to the data structures that keep track of children to ensure that
	# when sigchild is honored, no new child is born.
	#

	# For each existing child; if it's host doesn't exist, kill the child.

	foreach my $child (keys %ChildHash) {
	my $oldhost = $ChildHash{$child};
	if (!(exists $hosts{$oldhost})) {
	Log("CRITICAL", "Killing child for $oldhost host no longer exists");
	delete $ChildHash{$child};
	delete $HostToPid{$oldhost};
	kill 'QUIT' => $child;
	}
	}
	# For each remaining existing child; if it's host's ip has changed,
	# Restart the child on the new IP.

	foreach my $child (keys %ChildHash) {
	my $oldhost = $ChildHash{$child};
	my $oldip = $HostHash{$oldhost};
	if ($hosts{$oldhost} ne $oldip) {

	# kill the old child.

	Log("CRITICAL", "Killing child for $oldhost host ip has changed...");
	delete $ChildHash{$child};
	delete $HostToPid{$oldhost};
	kill 'QUIT' => $child;

	# Do the book-keeping needed to start a new child on the
	# new ip.

	$HostHash{$oldhost} = $hosts{$oldhost};
	CreateChild($oldhost);
	}
	}
	# Finally, for each new host, not in the host hash, create a
	# enter the host and create a new child.
	# Force a status display of any existing process.

	foreach my $host (keys %hosts) {
	if(!(exists $HostHash{$host})) {
	Log("INFO", "New host $host discovered in hosts.tab...");
	$HostHash{$host} = $hosts{$host};
	CreateChild($host);
	} else {
	kill 'HUP' => $HostToPid{$host}; # status display.
	}
	}
	}


	=pod

	=head1 Restart

	Signal handler for HUP... all children are killed and
	we self restart. This is an el-cheapo way to re read
	the config file.

	=cut

	sub Restart {
	&KillThemAll; # First kill all the children.
	Log("CRITICAL", "Restarting");
	my $execdir = $perlvar{'lonDaemons'};
	unlink("$execdir/logs/lonc.pid");
	exec("$execdir/loncnew");
	}

=pod	=pod

=head1 KillThemAll	=head1 KillThemAll

Signal handler that kills all children by sending them a	Signal handler that kills all children by sending them a
SIGINT. Responds to sigint and sigterm.	SIGHUP. Responds to sigint and sigterm.

=cut	=cut

sub KillThemAll {	sub KillThemAll {
Debug(2, "Kill them all!!");	Debug(2, "Kill them all!!");
local($SIG{CHLD}) = 'IGNORE'; # Our children >will< die.	local($SIG{CHLD}) = 'IGNORE'; # Our children >will< die.
foreach $pid (keys %ChildHash) {	foreach my $pid (keys %ChildHash) {
my $serving = $ChildHash{$pid};	my $serving = $ChildHash{$pid};
Debug(2, "Killing lonc for $serving pid = $pid");	Debug(2, "Killing lonc for $serving pid = $pid");
ShowStatus("Killing lonc for $serving pid = $pid");	ShowStatus("Killing lonc for $serving pid = $pid");
Log("CRITICAL", "Killing lonc for $serving pid = $pid");	Log("CRITICAL", "Killing lonc for $serving pid = $pid");
kill('INT', $pid);	kill 'QUIT' => $pid;
	delete($ChildHash{$pid});
}	}
Log("CRITICAL", "Killing the master process.");	my $execdir = $perlvar{'lonDaemons'};
exit	unlink("$execdir/logs/lonc.pid");

}	}

=pod	=pod

	=head1 Terminate

	Terminate the system.

	=cut

	sub Terminate {
	KillThemAll;
	Log("CRITICAL","Master process exiting");
	exit 0;

	}
	=pod

=head1 Theory	=head1 Theory

The event class is used to build this as a single process with an	The event class is used to build this as a single process with an

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

Removed from v.1.12
changed lines
	Added in v.1.30