loncom/loncnew - diff

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Diff for /loncom/loncnew between versions 1.58 and 1.85

version 1.58, 2004/09/22 10:34:44	version 1.85, 2007/05/01 01:04:23
Line 60 use LONCAPA::Stack;	Line 60 use LONCAPA::Stack;
use LONCAPA::LondConnection;	use LONCAPA::LondConnection;
use LONCAPA::LondTransaction;	use LONCAPA::LondTransaction;
use LONCAPA::Configuration;	use LONCAPA::Configuration;
use LONCAPA::HashIterator;	use Fcntl qw(:flock);


# Read the httpd configuration file to get perl variables	# Read the httpd configuration file to get perl variables
Line 72 my %perlvar = %{$perlvarref};	Line 72 my %perlvar = %{$perlvarref};
#	#
# parent and shared variables.	# parent and shared variables.

my %ChildHash; # by pid -> host.	my %ChildPid; # by pid -> host.
my %HostToPid; # By host -> pid.	my %ChildHost; # by host.
my %HostHash; # by loncapaname -> IP.	my %listening_to; # Socket->host table for who the parent
	# is listening to.
	my %parent_dispatchers; # host-> listener watcher events.

	my %parent_handlers; # Parent signal handlers...

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.
Line 85 my $NextDebugLevel= 2; # So Sigint can	Line 88 my $NextDebugLevel= 2; # So Sigint can
my $IdleTimeout= 600; # Wait 10 minutes before pruning connections.	my $IdleTimeout= 600; # Wait 10 minutes before pruning connections.

my $LogTransactions = 0; # When True, all transactions/replies get logged.	my $LogTransactions = 0; # When True, all transactions/replies get logged.
	my $executable = $0; # Get the full path to me.

#	#
# 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 $RemoteHostId; # default lonid of host child is talking to.
	my @all_host_ids;
my $UnixSocketDir= $perlvar{'lonSockDir'};	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.
Line 100 my $ConnectionCount = 0;	Line 106 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 $RecentLogEntry = "";	my $RecentLogEntry = "";
my $ConnectionRetries=2; # Number of connection retries allowed.	my $ConnectionRetries=5; # Number of connection retries allowed.
my $ConnectionRetriesLeft=2; # Number of connection retries remaining.	my $ConnectionRetriesLeft=5; # Number of connection retries remaining.
my $LondVersion = "unknown"; # Version of lond we talk with.	my $LondVersion = "unknown"; # Version of lond we talk with.
my $KeyMode = ""; # e.g. ssl, local, insecure from last connect.	my $KeyMode = ""; # e.g. ssl, local, insecure from last connect.
my $LondConnecting = 0; # True when a connection is being built.	my $LondConnecting = 0; # True when a connection is being built.

my $DieWhenIdle = 0; # When true children die when trimmed -> 0.

	my $I_am_child = 0; # True if this is the child process.

#	#
# The hash below gives the HTML format for log messages	# The hash below gives the HTML format for log messages
Line 143 sub UpdateStatus {	Line 151 sub UpdateStatus {
Makes an entry into the permanent log file.	Makes an entry into the permanent log file.

=cut	=cut

sub LogPerm {	sub LogPerm {
my $message=shift;	my $message=shift;
my $execdir=$perlvar{'lonDaemons'};	my $execdir=$perlvar{'lonDaemons'};
Line 188 sub Log {	Line 197 sub Log {
my $now = time;	my $now = time;
my $local = localtime($now);	my $local = localtime($now);
my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";	my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
my $finalformat = $finalformat.$format."\n";	$finalformat = $finalformat.$format."\n";

# open the file and put the result.	# open the file and put the result.

Line 262 sub SocketDump {	Line 271 sub SocketDump {
and as what we return in a SIGUSR1	and as what we return in a SIGUSR1

=cut	=cut

sub ShowStatus {	sub ShowStatus {
my $state = shift;	my $state = shift;
my $now = time;	my $now = time;
Line 272 sub ShowStatus {	Line 282 sub ShowStatus {

=pod	=pod

=head 2 SocketTimeout	=head2 SocketTimeout

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


=cut	=cut

sub SocketTimeout {	sub SocketTimeout {
my $Socket = shift;	my $Socket = shift;
Log("WARNING", "A socket timeout was detected");	Log("WARNING", "A socket timeout was detected");
Line 296 sub SocketTimeout {	Line 307 sub SocketTimeout {
}	}

}	}

	#
	# This function should be called by the child in all cases where it must
	# exit. The child process must create a lock file for the AF_UNIX socket
	# in order to prevent connection requests from lonnet in the time between
	# process exit and the parent picking up the listen again.
	#
	# Parameters:
	# exit_code - Exit status value, however see the next parameter.
	# message - If this optional parameter is supplied, the exit
	# is via a die with this message.
	#
	sub child_exit {
	my ($exit_code, $message) = @_;

	# Regardless of how we exit, we may need to do the lock thing:

	#
	# Create a lock file since there will be a time window
	# between our exit and the parent's picking up the listen
	# during which no listens will be done on the
	# lonnet client socket.
	#
	my $lock_file = &GetLoncSocketPath().".lock";
	open(LOCK,">$lock_file");
	print LOCK "Contents not important";
	close(LOCK);
	unlink(&GetLoncSocketPath());

	if ($message) {
	die($message);
	} else {
	exit($exit_code);
	}
	}
#----------------------------- Timer management ------------------------	#----------------------------- Timer management ------------------------

=pod	=pod
Line 325 sub Tick {	Line 371 sub Tick {
KillSocket($Socket);	KillSocket($Socket);
$IdleSeconds = 0; # Otherwise all connections get trimmed to fast.	$IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
UpdateStatus();	UpdateStatus();
if(($ConnectionCount == 0) && $DieWhenIdle) {	if(($ConnectionCount == 0)) {
#	&child_exit(0);
# Create a lock file since there will be a time window
# between our exit and the parent's picking up the listen
# during which no listens will be done on the
# lonnet client socket.
#
my $lock_file = GetLoncSocketPath().".lock";
open(LOCK,">$lock_file");
print LOCK "Contents not important";
close(LOCK);

exit(0);
}	}
}	}
} else {	} else {
Line 383 sub Tick {	Line 419 sub Tick {
$KeyMode = "";	$KeyMode = "";
$clock_watcher->cancel();	$clock_watcher->cancel();
}	}
	&UpdateStatus();
}	}

=pod	=pod
Line 465 the data and Event->w->fd is the socket	Line 502 the data and Event->w->fd is the socket
sub ClientWritable {	sub ClientWritable {
my $Event = shift;	my $Event = shift;
my $Watcher = $Event->w;	my $Watcher = $Event->w;
	if (!defined($Watcher)) {
	&child_exit(-1,'No watcher for event in ClientWritable');
	}
my $Data = $Watcher->data;	my $Data = $Watcher->data;
my $Socket = $Watcher->fd;	my $Socket = $Watcher->fd;

Line 528 sub ClientWritable {	Line 568 sub ClientWritable {
}	}
} else {	} else {
$Watcher->cancel(); # A delayed request...just cancel.	$Watcher->cancel(); # A delayed request...just cancel.
	return;
}	}
}	}

Line 636 sub FailTransaction {	Line 677 sub FailTransaction {

if ($ConnectionRetriesLeft > 0) {	if ($ConnectionRetriesLeft > 0) {
Log("WARNING", "Failing transaction "	Log("WARNING", "Failing transaction "
.$transaction->getRequest());	.$transaction->getLoggableRequest());
}	}
Debug(1, "Failing transaction: ".$transaction->getRequest());	Debug(1, "Failing transaction: ".$transaction->getLoggableRequest());
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());
Line 648 sub FailTransaction {	Line 689 sub FailTransaction {
}	}

=pod	=pod

=head1 EmptyQueue	=head1 EmptyQueue

Fails all items in the work queue with con_lost.	Fails all items in the work queue with con_lost.
Note that each item in the work queue is a transaction.	Note that each item in the work queue is a transaction.

=cut	=cut

sub EmptyQueue {	sub EmptyQueue {
$ConnectionRetriesLeft--; # Counts as connection failure too.	$ConnectionRetriesLeft--; # Counts as connection failure too.
while($WorkQueue->Count()) {	while($WorkQueue->Count()) {
Line 669 sub EmptyQueue {	Line 712 sub EmptyQueue {
Close all connections open on lond prior to exit e.g.	Close all connections open on lond prior to exit e.g.

=cut	=cut

sub CloseAllLondConnections {	sub CloseAllLondConnections {
foreach my $Socket (keys %ActiveConnections) {	foreach my $Socket (keys %ActiveConnections) {
if(exists($ActiveTransactions{$Socket})) {	if(exists($ActiveTransactions{$Socket})) {
Line 677 sub CloseAllLondConnections {	Line 721 sub CloseAllLondConnections {
KillSocket($Socket);	KillSocket($Socket);
}	}
}	}
=cut

=pod	=pod

Line 699 Parameters:	Line 742 Parameters:

nonzero if we are allowed to create a new connection.	nonzero if we are allowed to create a new connection.


=cut	=cut

sub KillSocket {	sub KillSocket {
my $Socket = shift;	my $Socket = shift;

Line 912 sub LondReadable {	Line 955 sub LondReadable {
# We need to be writable for this and probably don't belong	# We need to be writable for this and probably don't belong
# here inthe first place.	# here inthe first place.

Deubg(6, "SendingRequest state encountered in readable");	Debug(6, "SendingRequest state encountered in readable");
$Watcher->poll("w");	$Watcher->poll("w");
$Watcher->cb(\&LondWritable);	$Watcher->cb(\&LondWritable);

Line 1110 sub LondWritable {	Line 1153 sub LondWritable {
}	}

}	}

=pod	=pod

=cut	=cut


sub QueueDelayed {	sub QueueDelayed {
Debug(3,"QueueDelayed called");	Debug(3,"QueueDelayed called");

Line 1120 sub QueueDelayed {	Line 1166 sub QueueDelayed {

Debug(4, "Delayed path: ".$path);	Debug(4, "Delayed path: ".$path);
opendir(DIRHANDLE, $path);	opendir(DIRHANDLE, $path);

my @alldelayed = grep /\.$RemoteHost$/, readdir DIRHANDLE;	my $host_id_re = '(?:'.join('\|',map {quotemeta($_)} (@all_host_ids)).')';
	my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));
closedir(DIRHANDLE);	closedir(DIRHANDLE);
my $dfname;	foreach my $dfname (sort(@alldelayed)) {
my $reqfile;	my $reqfile = "$path/$dfname";
foreach $dfname (sort @alldelayed) {	my ($host_id) = ($dfname =~ /\.([^.]*)$/);
$reqfile = "$path/$dfname";	Debug(4, "queueing ".$reqfile." for $host_id");
Debug(4, "queueing ".$reqfile);
my $Handle = IO::File->new($reqfile);	my $Handle = IO::File->new($reqfile);
my $cmd = <$Handle>;	my $cmd = <$Handle>;
chomp $cmd; # There may or may not be a newline...	chomp $cmd; # There may or may not be a newline...
$cmd = $cmd."\n"; # now for sure there's exactly one newline.	$cmd = $cmd."\n"; # now for sure there's exactly one newline.
my $Transaction = LondTransaction->new($cmd);	my $Transaction = LondTransaction->new("sethost:$host_id:$cmd");
$Transaction->SetDeferred($reqfile);	$Transaction->SetDeferred($reqfile);
QueueTransaction($Transaction);	QueueTransaction($Transaction);
}	}
Line 1156 sub MakeLondConnection {	Line 1202 sub MakeLondConnection {
.GetServerPort());	.GetServerPort());

my $Connection = LondConnection->new(&GetServerHost(),	my $Connection = LondConnection->new(&GetServerHost(),
&GetServerPort());	&GetServerPort(),
	&GetHostId());

if($Connection eq undef) { # Needs to be more robust later.	if($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.");
Line 1164 sub MakeLondConnection {	Line 1211 sub MakeLondConnection {
return 0; # Failure.	return 0; # Failure.
} else {	} else {

	$LondConnecting = 1; # Connection in progress.
# 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
Line 1171 sub MakeLondConnection {	Line 1219 sub MakeLondConnection {
#	#
my $Socket = $Connection->GetSocket();	my $Socket = $Connection->GetSocket();
if($Socket eq undef) {	if($Socket eq undef) {
die "did not get a socket from the connection";	&child_exit(-1, "did not get a socket from the connection");
} else {	} else {
&Debug(9,"MakeLondConnection got socket: ".$Socket);	&Debug(9,"MakeLondConnection got socket: ".$Socket);
}	}
Line 1194 sub MakeLondConnection {	Line 1242 sub MakeLondConnection {
}	}
Log("SUCESS", "Created connection ".$ConnectionCount	Log("SUCESS", "Created connection ".$ConnectionCount
." to host ".GetServerHost());	." to host ".GetServerHost());
$LondConnecting = 1; # Connection in progress.
return 1; # Return success.	return 1; # Return success.
}	}

Line 1353 sub ClientRequest {	Line 1400 sub ClientRequest {

}	}

	#
	# Accept a connection request for a client (lonc child) and
	# start up an event watcher to keep an eye on input from that
	# Event. This can be called both from NewClient and from
	# ChildProcess.
	# Parameters:
	# $socket - The listener socket.
	# Returns:
	# NONE
	# Side Effects:
	# An event is made to watch the accepted connection.
	# Active clients hash is updated to reflect the new connection.
	# The client connection count is incremented.
	#
	sub accept_client {
	my ($socket) = @_;

	Debug(8, "Entering accept for lonc UNIX socket\n");
	my $connection = $socket->accept(); # Accept the client connection.
	Debug(8,"Connection request accepted from "
	.GetPeername($connection, AF_UNIX));


	my $description = sprintf("Connection to lonc client %d",
	$ClientConnection);
	Debug(9, "Creating event named: ".$description);
	Event->io(cb => \&ClientRequest,
	poll => 'r',
	desc => $description,
	data => "",
	fd => $connection);
	$ActiveClients{$connection} = $ClientConnection;
	$ClientConnection++;
	}

=pod	=pod

Line 1371 sub NewClient {	Line 1452 sub NewClient {
my $event = shift; # Get the event parameters.	my $event = shift; # Get the event parameters.
my $watcher = $event->w;	my $watcher = $event->w;
my $socket = $watcher->fd; # Get the event' socket.	my $socket = $watcher->fd; # Get the event' socket.
my $connection = $socket->accept(); # Accept the client connection.
Debug(8,"Connection request accepted from "
.GetPeername($connection, AF_UNIX));


my $description = sprintf("Connection to lonc client %d",	&accept_client($socket);
$ClientConnection);
Debug(9, "Creating event named: ".$description);
Event->io(cb => \&ClientRequest,
poll => 'r',
desc => $description,
data => "",
fd => $connection);
$ActiveClients{$connection} = $ClientConnection;
$ClientConnection++;
}	}

=pod	=pod
Line 1425 sub GetServerHost {	Line 1493 sub GetServerHost {

=pod	=pod

	=head2 GetServerId

	Returns the hostid whose lond we talk with.

	=cut

	sub GetHostId {
	return $RemoteHostId; # Setup by the fork.
	}

	=pod

=head2 GetServerPort	=head2 GetServerPort

Returns the lond port number.	Returns the lond port number.
Line 1452 another event handler to subess requests	Line 1532 another event handler to subess requests
=cut	=cut

sub SetupLoncListener {	sub SetupLoncListener {
	my ($host,$SocketName) = @_;
	if (!$host) { $host = &GetServerHost(); }
	if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }

my $host = GetServerHost(); # Default host.
if (@_) {
($host) = @_ # Override host with parameter.
}

my $socket;
my $SocketName = GetLoncSocketPath($host);
unlink($SocketName);	unlink($SocketName);

	my $socket;
unless ($socket =IO::Socket::UNIX->new(Local => $SocketName,	unless ($socket =IO::Socket::UNIX->new(Local => $SocketName,
Listen => 250,	Listen => 250,
Type => SOCK_STREAM)) {	Type => SOCK_STREAM)) {
die "Failed to create a lonc listner socket";	if($I_am_child) {
	&child_exit(-1, "Failed to create a lonc listener socket");
	} else {
	die "Failed to create a lonc listner socket";
	}
}	}
Event->io(cb => \&NewClient,	return $socket;
poll => 'r',
desc => 'Lonc listener Unix Socket',
fd => $socket);
}	}

#	#
Line 1499 into the status file.	Line 1579 into the status file.

We also use this to reset the retries count in order to allow the	We also use this to reset the retries count in order to allow the
client to retry connections with a previously dead server.	client to retry connections with a previously dead server.

=cut	=cut

sub ChildStatus {	sub ChildStatus {
Line 1507 sub ChildStatus {	Line 1588 sub ChildStatus {

Debug(2, "Reporting child status because : ".$watcher->data);	Debug(2, "Reporting child status because : ".$watcher->data);
my $docdir = $perlvar{'lonDocRoot'};	my $docdir = $perlvar{'lonDocRoot'};
my $fh = IO::File->new(">>$docdir/lon-status/loncstatus.txt");
print $fh $$."\t".$RemoteHost."\t".$Status."\t".	open(LOG,">>$docdir/lon-status/loncstatus.txt");
	flock(LOG,LOCK_EX);
	print LOG $$."\t".$RemoteHost."\t".$Status."\t".
$RecentLogEntry."\n";	$RecentLogEntry."\n";
#	#
# Write out information about each of the connections:	# Write out information about each of the connections:
#	#
if ($DebugLevel > 2) {	if ($DebugLevel > 2) {
print $fh "Active connection statuses: \n";	print LOG "Active connection statuses: \n";
my $i = 1;	my $i = 1;
print STDERR "================================= Socket Status Dump:\n";	print STDERR "================================= Socket Status Dump:\n";
foreach my $item (keys %ActiveConnections) {	foreach my $item (keys %ActiveConnections) {
my $Socket = $ActiveConnections{$item}->data;	my $Socket = $ActiveConnections{$item}->data;
my $state = $Socket->GetState();	my $state = $Socket->GetState();
print $fh "Connection $i State: $state\n";	print LOG "Connection $i State: $state\n";
print STDERR "---------------------- Connection $i \n";	print STDERR "---------------------- Connection $i \n";
$Socket->Dump(-1); # Ensure it gets dumped..	$Socket->Dump(-1); # Ensure it gets dumped..
$i++;	$i++;
}	}
}	}
	flock(LOG,LOCK_UN);
	close(LOG);
$ConnectionRetriesLeft = $ConnectionRetries;	$ConnectionRetriesLeft = $ConnectionRetries;
	UpdateStatus();
}	}

=pod	=pod
Line 1547 sub SignalledToDeath {	Line 1633 sub SignalledToDeath {
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\"");
exit 0;	exit 0;

}	}

	=pod

=head2 ToggleDebug	=head2 ToggleDebug

This sub toggles trace debugging on and off.	This sub toggles trace debugging on and off.
Line 1568 sub ToggleDebug {	Line 1656 sub ToggleDebug {

}	}

	=pod

=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.
	Optional parameter:
	$socket - if provided, this is a socket already open for listen
	on the client socket. Otherwise, a new listen is set up.

=cut	=cut

sub ChildProcess {	sub ChildProcess {
	# We've inherited all the
	# events of our parent and those have to be cancelled or else
	# all holy bloody chaos will result.. trust me, I already made
	# >that< mistake.

	my $host = GetServerHost();
	foreach my $listener (keys %parent_dispatchers) {
	my $watcher = $parent_dispatchers{$listener};
	my $s = $watcher->fd;
	if ($listener ne $host) { # Close everyone but me.
	Debug(5, "Closing listen socket for $listener");
	$s->close();
	}
	Debug(5, "Killing watcher for $listener");

	$watcher->cancel();
	delete($parent_dispatchers{$listener});

	}

	# kill off the parent's signal handlers too!
	#

	for my $handler (keys %parent_handlers) {
	my $watcher = $parent_handlers{$handler};
	$watcher->cancel();
	delete($parent_handlers{$handler});
	}

	$I_am_child = 1; # Seems like in spite of it all I may still getting
	# parent event dispatches.. flag I'm a child.


#	#
# Signals must be handled by the Event framework...	# Signals must be handled by the Event framework...
#	#

Event->signal(signal => "QUIT",	Event->signal(signal => "QUIT",
cb => \&SignalledToDeath,	cb => \&SignalledToDeath,
Line 1596 sub ChildProcess {	Line 1720 sub ChildProcess {
cb => \&ToggleDebug,	cb => \&ToggleDebug,
data => "INT");	data => "INT");

	# Figure out if we got passed a socket or need to open one to listen for
	# client requests.

	my ($socket) = @_;
	if (!$socket) {

	$socket = SetupLoncListener();
	}
	# Establish an event to listen for client connection requests.


	Event->io(cb => \&NewClient,
	poll => 'r',
	desc => 'Lonc Listener Unix Socket',
	fd => $socket);

SetupLoncListener();	$Event::DebugLevel = $DebugLevel;

$Event::Debuglevel = $DebugLevel;

Debug(9, "Making initial lond connection for ".$RemoteHost);	Debug(9, "Making initial lond connection for ".$RemoteHost);

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

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

	# need to accept the connection since the event may not fire.

	&accept_client($socket);

Debug(9,"Entering event loop");	Debug(9,"Entering event loop");
my $ret = Event::loop(); # Start the main event loop.	my $ret = Event::loop(); # Start the main event loop.


die "Main event loop exited!!!";	&child_exit (-1,"Main event loop exited!!!");
}	}

# Create a new child for host passed in:	# Create a new child for host passed in:

sub CreateChild {	sub CreateChild {
my $host = shift;	my ($host, $hostid) = @_;

my $sigset = POSIX::SigSet->new(SIGINT);	my $sigset = POSIX::SigSet->new(SIGINT);
sigprocmask(SIG_BLOCK, $sigset);	sigprocmask(SIG_BLOCK, $sigset);
Line 1627 sub CreateChild {	Line 1767 sub CreateChild {
my $pid = fork;	my $pid = fork;
if($pid) { # Parent	if($pid) { # Parent
$RemoteHost = "Parent";	$RemoteHost = "Parent";
$ChildHash{$pid} = $host;	$ChildPid{$pid} = $host;
$HostToPid{$host}= $pid;
sigprocmask(SIG_UNBLOCK, $sigset);	sigprocmask(SIG_UNBLOCK, $sigset);
	undef(@all_host_ids);
} else { # child.	} else { # child.
	$RemoteHostId = $hostid;
ShowStatus("Connected to ".$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.
	}
	}

	# parent_client_connection:
	# Event handler that processes client connections for the parent process.
	# This sub is called when the parent is listening on a socket and
	# a connection request arrives. We must:
	# Start a child process to accept the connection request.
	# Kill our listen on the socket.
	# Parameter:
	# event - The event object that was created to monitor this socket.
	# event->w->fd is the socket.
	# Returns:
	# NONE
	#
	sub parent_client_connection {
	if ($I_am_child) {
	# Should not get here, but seem to anyway:
	&Debug(5," Child caught parent client connection event!!");
	my ($event) = @_;
	my $watcher = $event->w;
	$watcher->cancel(); # Try to kill it off again!!
	} else {
	&Debug(9, "parent_client_connection");
	my ($event) = @_;
	my $watcher = $event->w;
	my $socket = $watcher->fd;
	my $connection = $socket->accept(); # Accept the client connection.
	Event->io(cb => \&get_remote_hostname,
	poll => 'r',
	data => "",
	fd => $connection);
	}
	}

	sub get_remote_hostname {
	my ($event) = @_;
	my $watcher = $event->w;
	my $socket = $watcher->fd;

	my $thisread;
	my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
	Debug(8, "rcv: data length = ".length($thisread)." read =".$thisread);
	if (!defined($rv) \|\| length($thisread) == 0) {
	# Likely eof on socket.
	Debug(5,"Client Socket closed on lonc for p_c_c");
	close($socket);
	$watcher->cancel();
	return;
}	}

	my $data = $watcher->data().$thisread;
	$watcher->data($data);
	if($data =~ /\n$/) { # Request entirely read.
	chomp($data);
	} else {
	return;
	}

	&Debug(5,"Creating child for $data (parent_client_connection)");
	(my $hostname,my $lonid,@all_host_ids) = split(':',$data);
	$ChildHost{$hostname}++;
	if ($ChildHost{$hostname} == 1) {
	&CreateChild($hostname,$lonid);
	} else {
	&Log('WARNING',"Request for a second child on $hostname");
	}
	# Clean up the listen since now the child takes over until it exits.
	$watcher->cancel(); # Nolonger listening to this event
	$socket->send("done\n");
	$socket->close();
}	}

	# parent_listen:
	# Opens a socket and starts a listen for the parent process on a client UNIX
	# domain socket.
	#
	# This involves:
	# Creating a socket for listen.
	# Removing any socket lock file
	# Adding an event handler for this socket becoming readable
	# To the parent's event dispatcher.
	# Parameters:
	# loncapa_host - LonCAPA cluster name of the host represented by the client
	# socket.
	# Returns:
	# NONE
	#
	sub parent_listen {
	my ($loncapa_host) = @_;
	Debug(5, "parent_listen: $loncapa_host");

	my ($socket,$file);
	if (!$loncapa_host) {
	$loncapa_host = 'common_parent';
	$file = $perlvar{'lonSockCreate'};
	} else {
	$file = &GetLoncSocketPath($loncapa_host);
	}
	$socket = &SetupLoncListener($loncapa_host,$file);

	$listening_to{$socket} = $loncapa_host;
	if (!$socket) {
	die "Unable to create a listen socket for $loncapa_host";
	}

	my $lock_file = $file.".lock";
	unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]

	my $watcher =
	Event->io(cb => \&parent_client_connection,
	poll => 'r',
	desc => "Parent listener unix socket ($loncapa_host)",
	data => "",
	fd => $socket);
	$parent_dispatchers{$loncapa_host} = $watcher;

	}

	sub parent_clean_up {
	my ($loncapa_host) = @_;
	Debug(-1, "parent_clean_up: $loncapa_host");

	my $socket_file = &GetLoncSocketPath($loncapa_host);
	unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]
	my $lock_file = $socket_file.".lock";
	unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
	}



	# This sub initiates a listen on the common unix domain lonc client socket.
	# loncnew starts up with no children, and only spawns off children when a
	# connection request occurs on the common client unix socket. The spawned
	# child continues to run until it has been idle a while at which point it
	# eventually exits and once more the parent picks up the listen.
	#
	# Parameters:
	# NONE
	# Implicit Inputs:
	# The configuration file that has been read in by LondConnection.
	# Returns:
	# NONE
	#
	sub listen_on_common_socket {
	Debug(5, "listen_on_common_socket");
	&parent_listen();
	}

	# server_died is called whenever a child process exits.
	# Since this is dispatched via a signal, we must process all
	# dead children until there are no more left. The action
	# is to:
	# - Remove the child from the bookeeping hashes
	# - Re-establish a listen on the unix domain socket associated
	# with that host.
	# Parameters:
	# The event, but we don't actually care about it.
	sub server_died {
	&Debug(9, "server_died called...");

	while(1) { # Loop until waitpid nowait fails.
	my $pid = waitpid(-1, WNOHANG);
	if($pid <= 0) {
	return; # Nothing left to wait for.
	}
	# need the host to restart:

	my $host = $ChildPid{$pid};
	if($host) { # It's for real...
	&Debug(9, "Caught sigchild for $host");
	delete($ChildPid{$pid});
	delete($ChildHost{$host});
	&parent_clean_up($host);

	} else {
	&Debug(5, "Caught sigchild for pid not in hosts hash: $pid");
	}
	}

	}

#	#
# Parent process logic pass 1:	# Parent process logic pass 1:
# For each entry in the hosts table, we will	# For each entry in the hosts table, we will
Line 1687 ShowStatus("Forking node servers");	Line 2006 ShowStatus("Forking node servers");
Log("CRITICAL", "--------------- Starting children ---------------");	Log("CRITICAL", "--------------- Starting children ---------------");

LondConnection::ReadConfig; # Read standard config files.	LondConnection::ReadConfig; # Read standard config files.
my $HostIterator = LondConnection::GetHostIterator;
while (! $HostIterator->end()) {

my $hostentryref = $HostIterator->get();	$RemoteHost = "[parent]";
CreateChild($hostentryref->[0]);	&listen_on_common_socket();
$HostHash{$hostentryref->[0]} = $hostentryref->[4];
$HostIterator->next();
}
$RemoteHost = "Parent Server";	$RemoteHost = "Parent Server";

# Maintain the population:	# Maintain the population:

ShowStatus("Parent keeping the flock");	ShowStatus("Parent keeping the flock");

#
# Set up parent signals:
#

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

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

	# We need to setup a SIGChild event to handle the exit (natural or otherwise)
	# of the children.

	Event->signal(cb => \&server_died,
	desc => "Child exit handler",
	signal => "CHLD");


	# Set up all the other signals we set up.

	$parent_handlers{INT} = Event->signal(cb => \&Terminate,
	desc => "Parent INT handler",
	signal => "INT");
	$parent_handlers{TERM} = Event->signal(cb => \&Terminate,
	desc => "Parent TERM handler",
	signal => "TERM");
	$parent_handlers{HUP} = Event->signal(cb => \&KillThemAll,
	desc => "Parent HUP handler.",
	signal => "HUP");
	$parent_handlers{USR1} = Event->signal(cb => \&CheckKids,
	desc => "Parent USR1 handler",
	signal => "USR1");
	$parent_handlers{USR2} = Event->signal(cb => \&UpdateKids,
	desc => "Parent USR2 handler.",
	signal => "USR2");

	# Start procdesing events.

	$Event::DebugLevel = $DebugLevel;
	Debug(9, "Parent entering event loop");
	my $ret = Event::loop();
	die "Main Event loop exited: $ret";

=pod	=pod

Line 1745 sub CheckKids {	Line 2069 sub CheckKids {
my $now=time;	my $now=time;
my $local=localtime($now);	my $local=localtime($now);
print $fh "LONC status $local - parent $$ \n\n";	print $fh "LONC status $local - parent $$ \n\n";
foreach my $pid (keys %ChildHash) {	foreach my $host (keys %parent_dispatchers) {
	print $fh "LONC Parent process listening for $host\n";
	}
	foreach my $pid (keys %ChildPid) {
Debug(2, "Sending USR1 -> $pid");	Debug(2, "Sending USR1 -> $pid");
kill 'USR1' => $pid; # Tell Child to report status.	kill 'USR1' => $pid; # Tell Child to report status.
sleep 1; # Wait so file doesn't intermix.
}	}

}	}

=pod	=pod
Line 1782 sub UpdateKids {	Line 2109 sub UpdateKids {

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

# Just in case we need to kill our own lonc, we wait a few seconds to	# I'm not sure what I was thinking in the first implementation.
# give it a chance to receive and relay lond's response to the	# someone will have to work hard to convince me the effect is any
# re-init command.	# different than Restart, especially now that we don't start up
#	# per host servers automatically, may as well just restart.
	# The down side is transactions that are in flight will get timed out
sleep(2); # Wait a couple of seconds.	# (lost unless they are critical).

my %hosts; # Indexed by loncapa hostname, value=ip.	&KillThemAll();

# 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.
}
}
}	}


Line 1875 sub Restart {	Line 2135 sub Restart {
Log("CRITICAL", "Restarting");	Log("CRITICAL", "Restarting");
my $execdir = $perlvar{'lonDaemons'};	my $execdir = $perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");	unlink("$execdir/logs/lonc.pid");
exec("$execdir/loncnew");	exec("$executable");
}	}

=pod	=pod
Line 1889 SIGHUP. Responds to sigint and sigterm.	Line 2149 SIGHUP. Responds to sigint and sigterm.

sub KillThemAll {	sub KillThemAll {
Debug(2, "Kill them all!!");	Debug(2, "Kill them all!!");
local($SIG{CHLD}) = 'IGNORE'; # Our children >will< die.
foreach my $pid (keys %ChildHash) {	#local($SIG{CHLD}) = 'IGNORE';
my $serving = $ChildHash{$pid};	# Our children >will< die.
	# but we need to catch their death and cleanup after them in case this is
	# a restart set of kills
	my @allpids = keys(%ChildPid);
	foreach my $pid (@allpids) {
	my $serving = $ChildPid{$pid};
ShowStatus("Nicely Killing lonc for $serving pid = $pid");	ShowStatus("Nicely Killing lonc for $serving pid = $pid");
Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");	Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
kill 'QUIT' => $pid;	kill 'QUIT' => $pid;
}	}
	ShowStatus("Finished killing child processes off.");

}	}


Line 1909 sub really_kill_them_all_dammit	Line 2173 sub really_kill_them_all_dammit
{	{
Debug(2, "Kill them all Dammit");	Debug(2, "Kill them all Dammit");
local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.	local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
foreach my $pid (keys %ChildHash) {	foreach my $pid (keys %ChildPid) {
my $serving = $ChildHash{$pid};	my $serving = $ChildPid{$pid};
&ShowStatus("Nastily killing lonc for $serving pid = $pid");	&ShowStatus("Nastily killing lonc for $serving pid = $pid");
Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");	Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
kill 'KILL' => $pid;	kill 'KILL' => $pid;
delete($ChildHash{$pid});	delete($ChildPid{$pid});
my $execdir = $perlvar{'lonDaemons'};	my $execdir = $perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");	unlink("$execdir/logs/lonc.pid");
}	}
}	}

=pod	=pod

=head1 Terminate	=head1 Terminate
Line 1941 sub Terminate {	Line 2206 sub Terminate {
exit 0;	exit 0;

}	}

	sub my_hostname {
	use Sys::Hostname;
	my $name = &hostname();
	&Debug(9,"Name is $name");
	return $name;
	}

=pod	=pod

=head1 Theory	=head1 Theory

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

Removed from v.1.58
changed lines
	Added in v.1.85