--- loncom/loncnew 2003/10/07 11:23:03 1.27
+++ loncom/loncnew 2007/05/01 01:04:23 1.85
@@ -2,7 +2,7 @@
# The LearningOnline Network with CAPA
# lonc maintains the connections to remote computers
#
-# $Id: loncnew,v 1.27 2003/10/07 11:23:03 foxr Exp $
+# $Id: loncnew,v 1.85 2007/05/01 01:04:23 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -35,105 +35,16 @@
# - Add ability to create/negotiate lond connections (done).
# - Add general logic for dispatching requests and timeouts. (done).
# - Add support for the lonc/lond requests. (done).
-# - Add logging/status monitoring.
-# - Add Signal handling - HUP restarts. USR1 status report.
+# - Add logging/status monitoring. (done)
+# - Add Signal handling - HUP restarts. USR1 status report. (done)
# - Add Configuration file I/O (done).
-# - Add management/status request interface.
+# - Add management/status request interface. (done)
# - Add deferred request capability. (done)
-# - Detect transmission timeouts.
+# - Detect transmission timeouts. (done)
#
-# Change log:
-# $Log: loncnew,v $
-# 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
-# Fix more problems with transaction failure.
-#
-# Revision 1.10 2003/06/24 02:46:04 foxr
-# 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
-# going or else the client will permanently give up on dead servers.
-#
-# Revision 1.9 2003/06/13 02:38:43 foxr
-# Add logging in 'expected format'
-#
-# Revision 1.8 2003/06/11 02:04:35 foxr
-# Support delayed transactions... this is done uniformly by encapsulating
-# transactions in an object ... a LondTransaction that is implemented by
-# LondTransaction.pm
-#
-# Revision 1.7 2003/06/03 01:59:39 foxr
-# complete coding to support deferred transactions.
-#
-#
use strict;
use lib "/home/httpd/lib/perl/";
-use lib "/home/foxr/newloncapa/types";
use Event qw(:DEFAULT );
use POSIX qw(:signal_h);
use POSIX;
@@ -149,12 +60,7 @@ use LONCAPA::Stack;
use LONCAPA::LondConnection;
use LONCAPA::LondTransaction;
use LONCAPA::Configuration;
-use LONCAPA::HashIterator;
-
-
-#
-# Disable all signals we might receive from outside for now.
-#
+use Fcntl qw(:flock);
# Read the httpd configuration file to get perl variables
@@ -166,22 +72,30 @@ my %perlvar = %{$perlvarref};
#
# parent and shared variables.
-my %ChildHash; # by pid -> host.
-my %HostToPid; # By host -> pid.
-my %HostHash; # by loncapaname -> IP.
+my %ChildPid; # by pid -> host.
+my %ChildHost; # by host.
+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 $ClientConnection = 0; # Uniquifier for client events.
my $DebugLevel = 0;
-my $NextDebugLevel= 10; # So Sigint can toggle this.
-my $IdleTimeout= 3600; # Wait an hour before pruning connections.
+my $NextDebugLevel= 2; # So Sigint can toggle this.
+my $IdleTimeout= 600; # Wait 10 minutes before pruning connections.
+
+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.
#
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 $IdleConnections = Stack->new(); # Set of idle connections
my %ActiveConnections; # Connections to the remote lond.
@@ -194,6 +108,13 @@ my $Status = ""; # Current stat
my $RecentLogEntry = "";
my $ConnectionRetries=5; # Number of connection retries allowed.
my $ConnectionRetriesLeft=5; # Number of connection retries remaining.
+my $LondVersion = "unknown"; # Version of lond we talk with.
+my $KeyMode = ""; # e.g. ssl, local, insecure from last connect.
+my $LondConnecting = 0; # True when a connection is being built.
+
+
+
+my $I_am_child = 0; # True if this is the child process.
#
# The hash below gives the HTML format for log messages
@@ -201,13 +122,27 @@ my $ConnectionRetriesLeft=5; # Number of
#
my %LogFormats;
-$LogFormats{"CRITICAL"} = "CRITICAL: %s";
-$LogFormats{"SUCCESS"} = "SUCCESS: %s";
-$LogFormats{"INFO"} = "INFO: %s";
-$LogFormats{"WARNING"} = "WARNING: %s";
+$LogFormats{"CRITICAL"} = "CRITICAL: %s";
+$LogFormats{"SUCCESS"} = "SUCCESS: %s";
+$LogFormats{"INFO"} = "INFO: %s";
+$LogFormats{"WARNING"} = "WARNING: %s";
$LogFormats{"DEFAULT"} = " %s ";
+# UpdateStatus;
+# Update the idle status display to show how many connections
+# are left, retries and other stuff.
+#
+sub UpdateStatus {
+ if ($ConnectionRetriesLeft > 0) {
+ ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount
+ ." Retries remaining: ".$ConnectionRetriesLeft
+ ." ($KeyMode)");
+ } else {
+ ShowStatus(GetServerHost()." >> DEAD <<");
+ }
+}
+
=pod
@@ -216,6 +151,7 @@ $LogFormats{"DEFAULT"} = " %s ";
Makes an entry into the permanent log file.
=cut
+
sub LogPerm {
my $message=shift;
my $execdir=$perlvar{'lonDaemons'};
@@ -247,9 +183,9 @@ host and the time will be formatted into
=cut
sub Log {
- my $severity = shift;
- my $message = shift;
-
+
+ my ($severity, $message) = @_;
+
if(!$LogFormats{$severity}) {
$severity = "DEFAULT";
}
@@ -261,7 +197,7 @@ sub Log {
my $now = time;
my $local = localtime($now);
my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
- my $finalformat = $finalformat.$format."\n";
+ $finalformat = $finalformat.$format."\n";
# open the file and put the result.
@@ -284,8 +220,10 @@ Returns the name of the host that a sock
=cut
sub GetPeername {
- my $connection = shift;
- my $AdrFamily = shift;
+
+
+ my ($connection, $AdrFamily) = @_;
+
my $peer = $connection->peername();
my $peerport;
my $peerip;
@@ -299,7 +237,6 @@ sub GetPeername {
return $peerfile;
}
}
-#----------------------------- Timer management ------------------------
=pod
=head2 Debug
@@ -309,18 +246,20 @@ Invoked to issue a debug message.
=cut
sub Debug {
- my $level = shift;
- my $message = shift;
+
+ my ($level, $message) = @_;
+
if ($level <= $DebugLevel) {
Log("INFO", "-Debug- $message host = $RemoteHost");
}
}
sub SocketDump {
- my $level = shift;
- my $socket= shift;
+
+ my ($level, $socket) = @_;
+
if($level <= $DebugLevel) {
- $socket->Dump();
+ $socket->Dump(-1); # Ensure it will get dumped.
}
}
@@ -332,6 +271,7 @@ sub SocketDump {
and as what we return in a SIGUSR1
=cut
+
sub ShowStatus {
my $state = shift;
my $now = time;
@@ -342,21 +282,68 @@ sub ShowStatus {
=pod
-=head 2 SocketTimeout
+=head2 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;
-
+ Log("WARNING", "A socket timeout was detected");
+ Debug(5, " SocketTimeout called: ");
+ $Socket->Dump(0);
+ if(exists($ActiveTransactions{$Socket})) {
+ FailTransaction($ActiveTransactions{$Socket});
+ }
KillSocket($Socket); # A transaction timeout also counts as
# a connection failure:
$ConnectionRetriesLeft--;
+ if($ConnectionRetriesLeft <= 0) {
+ Log("CRITICAL", "Host marked DEAD: ".GetServerHost());
+ $LondConnecting = 0;
+ }
+
}
+#
+# 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 ------------------------
+
=pod
=head2 Tick
@@ -367,13 +354,12 @@ Invoked each timer tick.
sub Tick {
+ my ($Event) = @_;
+ my $clock_watcher = $Event->w;
+
my $client;
- if($ConnectionRetriesLeft > 0) {
- ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount
- ." Retries remaining: ".$ConnectionRetriesLeft);
- } else {
- ShowStatus(GetServerHost()." >> DEAD <<");
- }
+ UpdateStatus();
+
# Is it time to prune connection count:
@@ -383,6 +369,12 @@ sub Tick {
if($IdleSeconds > $IdleTimeout) { # Prune a connection...
my $Socket = $IdleConnections->pop();
KillSocket($Socket);
+ $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
+ UpdateStatus();
+ if(($ConnectionCount == 0)) {
+ &child_exit(0);
+
+ }
}
} else {
$IdleSeconds = 0; # Reset idle count if not idle.
@@ -390,35 +382,44 @@ sub Tick {
#
# For each inflight transaction, tick down its timeout counter.
#
- foreach my $item (keys %ActiveTransactions) {
- my $Socket = $ActiveTransactions{$item}->getServer();
- $Socket->Tick();
+
+ foreach my $item (keys %ActiveConnections) {
+ my $State = $ActiveConnections{$item}->data->GetState();
+ if ($State ne 'Idle') {
+ Debug(5,"Ticking Socket $State $item");
+ $ActiveConnections{$item}->data->Tick();
+ }
}
# 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.
#
-
+ # Note this code is dead now...
+ #
my $Requests = $WorkQueue->Count();
- if (($ConnectionCount == 0) && ($Requests > 0)) {
+ if (($ConnectionCount == 0) && ($Requests > 0) && (!$LondConnecting)) {
if ($ConnectionRetriesLeft > 0) {
- my $Connections = ($Requests <= $MaxConnectionCount) ?
- $Requests : $MaxConnectionCount;
- Debug(1,"Work but no connections, start ".$Connections." of them");
- my $successCount = 0;
- for (my $i =0; $i < $Connections; $i++) {
- $successCount += MakeLondConnection();
- }
- if($successCount == 0) { # All connections failed:
- Debug(1,"Work in queue failed to make any connectiouns\n");
+ Debug(5,"Work but no connections, Make a new one");
+ my $success;
+ $success = &MakeLondConnection;
+ if($success == 0) { # All connections failed:
+ Debug(5,"Work in queue failed to make any connectiouns\n");
EmptyQueue(); # Fail pending transactions with con_lost.
+ CloseAllLondConnections(); # Should all be closed but....
}
} else {
+ $LondConnecting = 0;
ShowStatus(GetServerHost()." >>> DEAD!!! <<<");
- Debug(1,"Work in queue, but gave up on connections..flushing\n");
+ Debug(5,"Work in queue, but gave up on connections..flushing\n");
EmptyQueue(); # Connections can't be established.
+ CloseAllLondConnections(); # Should all already be closed but...
}
}
+ if ($ConnectionCount == 0) {
+ $KeyMode = "";
+ $clock_watcher->cancel();
+ }
+ &UpdateStatus();
}
=pod
@@ -439,7 +440,7 @@ Trigger disconnections of idle sockets.
sub SetupTimer {
Debug(6, "SetupTimer");
- Event->timer(interval => 1, debug => 1, cb => \&Tick );
+ Event->timer(interval => 1, cb => \&Tick );
}
=pod
@@ -459,21 +460,22 @@ long enough, it will be shut down and re
sub ServerToIdle {
my $Socket = shift; # Get the socket.
+ $KeyMode = $Socket->{AuthenticationMode};
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:
my $reqdata = $WorkQueue->dequeue(); # This is a LondTransaction
- unless($reqdata eq undef) {
- Debug(9, "Queue gave request data: ".$reqdata->getRequest());
+ if ($reqdata ne undef) {
+ Debug(5, "Queue gave request data: ".$reqdata->getRequest());
&StartRequest($Socket, $reqdata);
} else {
# 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);
}
}
@@ -500,6 +502,9 @@ the data and Event->w->fd is the socket
sub ClientWritable {
my $Event = shift;
my $Watcher = $Event->w;
+ if (!defined($Watcher)) {
+ &child_exit(-1,'No watcher for event in ClientWritable');
+ }
my $Data = $Watcher->data;
my $Socket = $Watcher->fd;
@@ -519,7 +524,7 @@ sub ClientWritable {
# request.
&Debug(9,"Send result is ".$result." Defined: ".defined($result));
- if(defined($result)) {
+ if($result ne undef) {
&Debug(9, "send result was defined");
if($result == length($Data)) { # Entire string sent.
&Debug(9, "ClientWritable data all written");
@@ -538,7 +543,7 @@ sub ClientWritable {
} else { # Partial string sent.
$Watcher->data(substr($Data, $result));
if($result == 0) { # client hung up on us!!
- Log("INFO", "lonc pipe client hung up on us!");
+ # Log("INFO", "lonc pipe client hung up on us!");
$Watcher->cancel;
$Socket->shutdown(2);
$Socket->close();
@@ -563,6 +568,7 @@ sub ClientWritable {
}
} else {
$Watcher->cancel(); # A delayed request...just cancel.
+ return;
}
}
@@ -590,12 +596,15 @@ The transaction that is being completed.
=cut
sub CompleteTransaction {
- &Debug(6,"Complete transaction");
- my $Socket = shift;
- my $Transaction = shift;
+ &Debug(5,"Complete transaction");
+
+ my ($Socket, $Transaction) = @_;
if (!$Transaction->isDeferred()) { # Normal transaction
my $data = $Socket->GetReply(); # Data to send.
+ if($LogTransactions) {
+ Log("SUCCESS", "Reply from lond: '$data'");
+ }
StartClientReply($Transaction, $data);
} else { # Delete deferred transaction file.
Log("SUCCESS", "A delayed transaction was completed");
@@ -603,7 +612,9 @@ sub CompleteTransaction {
unlink $Transaction->getFile();
}
}
+
=pod
+
=head1 StartClientReply
Initiates a reply to a client where the reply data is a parameter.
@@ -619,17 +630,16 @@ sub CompleteTransaction {
The data to send to apached client.
=cut
+
sub StartClientReply {
- my $Transaction = shift;
- my $data = shift;
+ my ($Transaction, $data) = @_;
my $Client = $Transaction->getClient();
&Debug(8," Reply was: ".$data);
my $Serial = $ActiveClients{$Client};
my $desc = sprintf("Connection to lonc client %d",
-
$Serial);
Event->io(fd => $Client,
poll => "w",
@@ -637,7 +647,9 @@ sub StartClientReply {
cb => \&ClientWritable,
data => $data);
}
+
=pod
+
=head2 FailTransaction
Finishes a transaction with failure because the associated lond socket
@@ -647,8 +659,7 @@ sub StartClientReply {
- The transaction is 'live' in which case we initiate the sending
of "con_lost" to the client.
-Deleting the transaction means killing it from the
-%ActiveTransactions hash.
+Deleting the transaction means killing it from the %ActiveTransactions hash.
Parameters:
@@ -656,30 +667,36 @@ Parameters:
The LondTransaction we are failing.
+
=cut
sub FailTransaction {
my $transaction = shift;
- Log("WARNING", "Failing transaction ".$transaction->getRequest());
- Debug(1, "Failing transaction: ".$transaction->getRequest());
+
+ # If the socket is dead, that's already logged.
+
+ if ($ConnectionRetriesLeft > 0) {
+ Log("WARNING", "Failing transaction "
+ .$transaction->getLoggableRequest());
+ }
+ Debug(1, "Failing transaction: ".$transaction->getLoggableRequest());
if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.
my $client = $transaction->getClient();
Debug(1," Replying con_lost to ".$transaction->getRequest());
StartClientReply($transaction, "con_lost\n");
}
- if($ConnectionRetriesLeft <= 0) {
- Log("CRITICAL", "Host marked dead: ".GetServerHost());
- }
}
=pod
+
=head1 EmptyQueue
Fails all items in the work queue with con_lost.
Note that each item in the work queue is a transaction.
=cut
+
sub EmptyQueue {
$ConnectionRetriesLeft--; # Counts as connection failure too.
while($WorkQueue->Count()) {
@@ -695,12 +712,15 @@ sub EmptyQueue {
Close all connections open on lond prior to exit e.g.
=cut
+
sub CloseAllLondConnections {
foreach my $Socket (keys %ActiveConnections) {
- KillSocket($Socket);
+ if(exists($ActiveTransactions{$Socket})) {
+ FailTransaction($ActiveTransactions{$Socket});
+ }
+ KillSocket($Socket);
}
}
-=cut
=pod
@@ -722,8 +742,8 @@ Parameters:
nonzero if we are allowed to create a new connection.
-
=cut
+
sub KillSocket {
my $Socket = shift;
@@ -741,14 +761,15 @@ sub KillSocket {
}
if(exists($ActiveConnections{$Socket})) {
delete($ActiveConnections{$Socket});
+ $ConnectionCount--;
+ if ($ConnectionCount < 0) { $ConnectionCount = 0; }
}
- $ConnectionCount--;
-
# If the connection count has gone to zero and there is work in the
# work queue, the work all gets failed with con_lost.
#
if($ConnectionCount == 0) {
EmptyQueue();
+ CloseAllLondConnections; # Should all already be closed but...
}
}
@@ -774,6 +795,17 @@ The connection must echo the challenge b
The challenge has been replied to. The we are receiveing the
'ok' from the partner.
+=head3 State=ReadingVersionString
+
+We have requested the lond version and are reading the
+version back. Upon completion, we'll store the version away
+for future use(?).
+
+=head3 State=HostSet
+
+We have selected the domain name of our peer (multhomed hosts)
+and are getting the reply (presumably ok) back.
+
=head3 State=RequestingKey
The ok has been received and we need to send the request for
@@ -828,13 +860,18 @@ sub LondReadable {
&Debug(2, "Socket->Readable returned: $status");
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.
Log("WARNING",
"Lond connection lost.");
if(exists($ActiveTransactions{$Socket})) {
FailTransaction($ActiveTransactions{$Socket});
+ } else {
+ # Socket is connecting and failed... need to mark
+ # no longer connecting.
+
+ $LondConnecting = 0;
}
$Watcher->cancel();
KillSocket($Socket);
@@ -846,19 +883,34 @@ sub LondReadable {
$State = $Socket->GetState(); # Update in case of transition.
&Debug(6, "After read, state is ".$State);
- if($State eq "Initialized") {
+ if($State eq "Initialized") {
} elsif ($State eq "ChallengeReceived") {
# The challenge must be echoed back; The state machine
# in the connection takes care of setting that up. Just
# need to transition to writable:
-
+
$Watcher->cb(\&LondWritable);
$Watcher->poll("w");
} elsif ($State eq "ChallengeReplied") {
+ } elsif ($State eq "RequestingVersion") {
+ # Need to ask for the version... that is writiability:
+
+ $Watcher->cb(\&LondWritable);
+ $Watcher->poll("w");
+
+ } elsif ($State eq "ReadingVersionString") {
+ # Read the rest of the version string...
+ } elsif ($State eq "SetHost") {
+ # Need to request the actual domain get set...
+
+ $Watcher->cb(\&LondWritable);
+ $Watcher->poll("w");
+ } elsif ($State eq "HostSet") {
+ # Reading the 'ok' from the peer.
} elsif ($State eq "RequestingKey") {
# The ok was received. Now we need to request the key
@@ -870,6 +922,14 @@ sub LondReadable {
} elsif ($State eq "ReceivingKey") {
} elsif ($State eq "Idle") {
+
+ # This is as good a spot as any to get the peer version
+ # string:
+
+ if($LondVersion eq "unknown") {
+ $LondVersion = $Socket->PeerVersion();
+ Log("INFO", "Connected to lond version: $LondVersion");
+ }
# If necessary, complete a transaction and then go into the
# idle queue.
# Note that a trasition to idle indicates a live lond
@@ -878,7 +938,7 @@ sub LondReadable {
$ConnectionRetriesLeft = $ConnectionRetries; # success resets the count
$Watcher->cancel();
if(exists($ActiveTransactions{$Socket})) {
- Debug(8,"Completing transaction!!");
+ Debug(5,"Completing transaction!!");
CompleteTransaction($Socket,
$ActiveTransactions{$Socket});
} else {
@@ -886,12 +946,16 @@ sub LondReadable {
.$RemoteHost." now ready for action");
}
ServerToIdle($Socket); # Next work unit or idle.
+
+ #
+ $LondConnecting = 0; # Best spot I can think of for this.
+ #
} elsif ($State eq "SendingRequest") {
# We need to be writable for this and probably don't belong
# here inthe first place.
- Deubg(6, "SendingRequest state encountered in readable");
+ Debug(6, "SendingRequest state encountered in readable");
$Watcher->poll("w");
$Watcher->cb(\&LondWritable);
@@ -899,7 +963,7 @@ sub LondReadable {
} else {
- # Invalid state.
+ # Invalid state.
Debug(4, "Invalid state in LondReadable");
}
}
@@ -981,21 +1045,40 @@ sub LondWritable {
SocketDump(6,$Socket);
- if ($State eq "Connected") {
-
- if ($Socket->Writable() != 0) {
- # The write resulted in an error.
- # We'll treat this as if the socket got disconnected:
- Log("WARNING", "Connection to ".$RemoteHost.
- " has been disconnected");
+ # If the socket is writable, we must always write.
+ # Only by writing will we undergo state transitions.
+ # Old logic wrote in state specific code below, however
+ # That forces us at least through another invocation of
+ # this function after writability is possible again.
+ # This logic also factors out common code for handling
+ # write failures... in all cases, write failures
+ # Kill the socket.
+ # This logic makes the branches of the >big< if below
+ # so that the writing states are actually NO-OPs.
+
+ if ($Socket->Writable() != 0) {
+ # The write resulted in an error.
+ # We'll treat this as if the socket got disconnected:
+ Log("WARNING", "Connection to ".$RemoteHost.
+ " has been disconnected");
+ if(exists($ActiveTransactions{$Socket})) {
FailTransaction($ActiveTransactions{$Socket});
- $Watcher->cancel();
- KillSocket($Socket);
- return;
+ } else {
+ # In the process of conneting, so need to turn that off.
+
+ $LondConnecting = 0;
}
- # "init" is being sent...
+ $Watcher->cancel();
+ KillSocket($Socket);
+ return;
+ }
-
+
+
+ if ($State eq "Connected") {
+
+ # "init" is being sent...
+
} elsif ($State eq "Initialized") {
# Now that init was sent, we switch
@@ -1003,40 +1086,43 @@ sub LondWritable {
$Watcher->cb(\&LondReadable);
$Watcher->poll("r");
-
+
} elsif ($State eq "ChallengeReceived") {
# We received the challenge, now we
# are echoing it back. This is a no-op,
# we're waiting for the state to change
- if($Socket->Writable() != 0) {
-
- $Watcher->cancel();
- KillSocket($Socket);
- return;
- }
-
} elsif ($State eq "ChallengeReplied") {
# The echo was sent back, so we switch
# to watching readability.
$Watcher->cb(\&LondReadable);
$Watcher->poll("r");
+ } elsif ($State eq "RequestingVersion") {
+ # Sending the peer a version request...
+
+ } elsif ($State eq "ReadingVersionString") {
+ # Transition to read since we have sent the
+ # version command and now just need to read the
+ # version string from the peer:
+
+ $Watcher->cb(\&LondReadable);
+ $Watcher->poll("r");
+
+ } elsif ($State eq "SetHost") {
+ # Setting the remote domain...
+
+ } elsif ($State eq "HostSet") {
+ # Back to readable to get the ok.
+
+ $Watcher->cb(\&LondReadable);
+ $Watcher->poll("r");
+
} elsif ($State eq "RequestingKey") {
# At this time we're requesting the key.
# again, this is essentially a no-op.
- # we'll write the next chunk until the
- # state changes.
-
- if($Socket->Writable() != 0) {
- # Write resulted in an error.
- $Watcher->cancel();
- KillSocket($Socket);
- return;
-
- }
} elsif ($State eq "ReceivingKey") {
# Now we need to wait for the key
# to come back from the peer:
@@ -1045,20 +1131,10 @@ sub LondWritable {
$Watcher->poll("r");
} elsif ($State eq "SendingRequest") {
+
# At this time we are sending a request to the
# peer... write the next chunk:
- if($Socket->Writable() != 0) {
-
- if(exists($ActiveTransactions{$Socket})) {
- Debug(3, "Lond connection lost, failing transactions");
- FailTransaction($ActiveTransactions{$Socket});
- }
- $Watcher->cancel();
- KillSocket($Socket);
- return;
-
- }
} elsif ($State eq "ReceivingReply") {
# The send has completed. Wait for the
@@ -1077,9 +1153,12 @@ sub LondWritable {
}
}
+
=pod
=cut
+
+
sub QueueDelayed {
Debug(3,"QueueDelayed called");
@@ -1087,19 +1166,19 @@ sub QueueDelayed {
Debug(4, "Delayed path: ".$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);
- my $dfname;
- my $reqfile;
- foreach $dfname (sort @alldelayed) {
- $reqfile = "$path/$dfname";
- Debug(4, "queueing ".$reqfile);
+ foreach my $dfname (sort(@alldelayed)) {
+ my $reqfile = "$path/$dfname";
+ my ($host_id) = ($dfname =~ /\.([^.]*)$/);
+ Debug(4, "queueing ".$reqfile." for $host_id");
my $Handle = IO::File->new($reqfile);
my $cmd = <$Handle>;
chomp $cmd; # There may or may not be a 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);
QueueTransaction($Transaction);
}
@@ -1123,22 +1202,24 @@ sub MakeLondConnection {
.GetServerPort());
my $Connection = LondConnection->new(&GetServerHost(),
- &GetServerPort());
+ &GetServerPort(),
+ &GetHostId());
- 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.");
$ConnectionRetriesLeft--;
return 0; # Failure.
} else {
+ $LondConnecting = 1; # Connection in progress.
# The connection needs to have writability
# monitored in order to send the init sequence
# that starts the whole authentication/key
# exchange underway.
#
my $Socket = $Connection->GetSocket();
- if($Socket == undef) {
- die "did not get a socket from the connection";
+ if($Socket eq undef) {
+ &child_exit(-1, "did not get a socket from the connection");
} else {
&Debug(9,"MakeLondConnection got socket: ".$Socket);
}
@@ -1151,7 +1232,9 @@ sub MakeLondConnection {
data => $Connection,
desc => 'Connection to lond server');
$ActiveConnections{$Connection} = $event;
-
+ if ($ConnectionCount == 0) {
+ &SetupTimer; # Need to handle timeouts with connections...
+ }
$ConnectionCount++;
Debug(4, "Connection count = ".$ConnectionCount);
if($ConnectionCount == 1) { # First Connection:
@@ -1190,8 +1273,8 @@ The text of the request to send.
=cut
sub StartRequest {
- my $Lond = shift;
- my $Request = shift; # This is a LondTransaction.
+
+ my ($Lond, $Request) = @_;
Debug(6, "StartRequest: ".$Request->getRequest());
@@ -1240,17 +1323,22 @@ sub QueueTransaction {
my $LondSocket = $IdleConnections->pop();
if(!defined $LondSocket) { # Need to queue request.
- Debug(8,"Must queue...");
+ Debug(5,"Must queue...");
$WorkQueue->enqueue($requestData);
- if($ConnectionCount < $MaxConnectionCount) {
+ Debug(5, "Queue Transaction startnew $ConnectionCount $LondConnecting");
+ if(($ConnectionCount < $MaxConnectionCount) && (! $LondConnecting)) {
+
if($ConnectionRetriesLeft > 0) {
- Debug(4,"Starting additional lond connection");
- if(MakeLondConnection() == 0) {
+ Debug(5,"Starting additional lond connection");
+ if(&MakeLondConnection() == 0) {
EmptyQueue(); # Fail transactions, can't make connection.
+ CloseAllLondConnections; # Should all be closed but...
}
} else {
ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");
+ $LondConnecting = 0;
EmptyQueue(); # It's worse than that ... he's dead Jim.
+ CloseAllLondConnections; # Should all be closed but..
}
}
} else { # Can start the request:
@@ -1282,7 +1370,7 @@ sub ClientRequest {
my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
Debug(8, "rcv: data length = ".length($thisread)
." read =".$thisread);
- unless (defined $rv && length($thisread)) {
+ unless (defined $rv && length($thisread)) {
# Likely eof on socket.
Debug(5,"Client Socket closed on lonc for ".$RemoteHost);
close($socket);
@@ -1293,7 +1381,7 @@ sub ClientRequest {
Debug(8,"Data: ".$data." this read: ".$thisread);
$data = $data.$thisread; # Append new data.
$watcher->data($data);
- if($data =~ /(.*\n)/) { # Request entirely read.
+ if($data =~ /\n$/) { # Request entirely read.
if($data eq "close_connection_exit\n") {
Log("CRITICAL",
"Request Close Connection ... exiting");
@@ -1301,6 +1389,9 @@ sub ClientRequest {
exit;
}
Debug(8, "Complete transaction received: ".$data);
+ if($LogTransactions) {
+ Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.
+ }
my $Transaction = LondTransaction->new($data);
$Transaction->SetClient($socket);
QueueTransaction($Transaction);
@@ -1309,6 +1400,40 @@ 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
@@ -1327,21 +1452,8 @@ sub NewClient {
my $event = shift; # Get the event parameters.
my $watcher = $event->w;
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",
- $ClientConnection);
- Debug(9, "Creating event named: ".$description);
- Event->io(cb => \&ClientRequest,
- poll => 'r',
- desc => $description,
- data => "",
- fd => $connection);
- $ActiveClients{$connection} = $ClientConnection;
- $ClientConnection++;
+ &accept_client($socket);
}
=pod
@@ -1351,10 +1463,20 @@ sub NewClient {
Returns the name of the UNIX socket on which to listen for client
connections.
+=head2 Parameters:
+
+ host (optional) - Name of the host socket to return.. defaults to
+ the return from GetServerHost().
+
=cut
sub GetLoncSocketPath {
- return $UnixSocketDir."/".GetServerHost();
+
+ my $host = GetServerHost(); # Default host.
+ if (@_) {
+ ($host) = @_; # Override if supplied.
+ }
+ return $UnixSocketDir."/".$host;
}
=pod
@@ -1371,6 +1493,18 @@ sub GetServerHost {
=pod
+=head2 GetServerId
+
+Returns the hostid whose lond we talk with.
+
+=cut
+
+sub GetHostId {
+ return $RemoteHostId; # Setup by the fork.
+}
+
+=pod
+
=head2 GetServerPort
Returns the lond port number.
@@ -1391,22 +1525,49 @@ connection. The event handler establish
(creating a communcations channel), that int turn will establish
another event handler to subess requests.
+=head2 Parameters:
+
+ host (optional) Name of the host to set up a unix socket to.
+
=cut
sub SetupLoncListener {
+ my ($host,$SocketName) = @_;
+ if (!$host) { $host = &GetServerHost(); }
+ if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }
+
- my $socket;
- my $SocketName = GetLoncSocketPath();
unlink($SocketName);
+
+ my $socket;
unless ($socket =IO::Socket::UNIX->new(Local => $SocketName,
- Listen => 10,
+ Listen => 250,
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,
- poll => 'r',
- desc => 'Lonc listener Unix Socket',
- fd => $socket);
+ return $socket;
+}
+
+#
+# Toggle transaction logging.
+# Implicit inputs:
+# LogTransactions
+# Implicit Outputs:
+# LogTransactions
+sub ToggleTransactionLogging {
+ print STDERR "Toggle transaction logging...\n";
+ if(!$LogTransactions) {
+ $LogTransactions = 1;
+ } else {
+ $LogTransactions = 0;
+ }
+
+
+ Log("SUCCESS", "Toggled transaction logging: $LogTransactions \n");
}
=pod
@@ -1418,17 +1579,40 @@ 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".
+
+ open(LOG,">>$docdir/lon-status/loncstatus.txt");
+ flock(LOG,LOCK_EX);
+ print LOG $$."\t".$RemoteHost."\t".$Status."\t".
$RecentLogEntry."\n";
+ #
+ # Write out information about each of the connections:
+ #
+ if ($DebugLevel > 2) {
+ print LOG "Active connection statuses: \n";
+ my $i = 1;
+ print STDERR "================================= Socket Status Dump:\n";
+ foreach my $item (keys %ActiveConnections) {
+ my $Socket = $ActiveConnections{$item}->data;
+ my $state = $Socket->GetState();
+ print LOG "Connection $i State: $state\n";
+ print STDERR "---------------------- Connection $i \n";
+ $Socket->Dump(-1); # Ensure it gets dumped..
+ $i++;
+ }
+ }
+ flock(LOG,LOCK_UN);
+ close(LOG);
$ConnectionRetriesLeft = $ConnectionRetries;
+ UpdateStatus();
}
=pod
@@ -1449,12 +1633,14 @@ sub SignalledToDeath {
chomp($signal);
Log("CRITICAL", "Abnormal exit. Child $$ for $RemoteHost "
."died through "."\"$signal\"");
- LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
- ."\"$signal\"");
+ #LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
+# ."\"$signal\"");
exit 0;
}
+=pod
+
=head2 ToggleDebug
This sub toggles trace debugging on and off.
@@ -1470,18 +1656,54 @@ sub ToggleDebug {
}
+=pod
+
=head2 ChildProcess
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
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});
+ }
+
+ $I_am_child = 1; # Seems like in spite of it all I may still getting
+ # parent event dispatches.. flag I'm a child.
#
# Signals must be handled by the Event framework...
-#
+ #
Event->signal(signal => "QUIT",
cb => \&SignalledToDeath,
@@ -1492,53 +1714,250 @@ sub ChildProcess {
Event->signal(signal => "USR1",
cb => \&ChildStatus,
data => "USR1");
+ Event->signal(signal => "USR2",
+ cb => \&ToggleTransactionLogging);
Event->signal(signal => "INT",
cb => \&ToggleDebug,
data => "INT");
- SetupTimer();
-
- SetupLoncListener();
+ # Figure out if we got passed a socket or need to open one to listen for
+ # client requests.
+
+ my ($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);
- $Event::Debuglevel = $DebugLevel;
+ $Event::DebugLevel = $DebugLevel;
Debug(9, "Making initial lond connection for ".$RemoteHost);
# 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");
my $ret = Event::loop(); # Start the main event loop.
- die "Main event loop exited!!!";
+ &child_exit (-1,"Main event loop exited!!!");
}
# Create a new child for host passed in:
sub CreateChild {
+ my ($host, $hostid) = @_;
+
my $sigset = POSIX::SigSet->new(SIGINT);
sigprocmask(SIG_BLOCK, $sigset);
- my $host = shift;
$RemoteHost = $host;
Log("CRITICAL", "Forking server for ".$host);
my $pid = fork;
if($pid) { # Parent
$RemoteHost = "Parent";
- $ChildHash{$pid} = $host;
- $HostToPid{$host}= $pid;
+ $ChildPid{$pid} = $host;
sigprocmask(SIG_UNBLOCK, $sigset);
-
+ undef(@all_host_ids);
} else { # child.
+ $RemoteHostId = $hostid;
ShowStatus("Connected to ".$RemoteHost);
$SIG{INT} = 'DEFAULT';
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:
# For each entry in the hosts table, we will
@@ -1586,44 +2005,50 @@ ShowStatus("Forking node servers");
Log("CRITICAL", "--------------- Starting children ---------------");
-my $HostIterator = LondConnection::GetHostIterator;
-while (! $HostIterator->end()) {
+LondConnection::ReadConfig; # Read standard config files.
+
+$RemoteHost = "[parent]";
+&listen_on_common_socket();
- my $hostentryref = $HostIterator->get();
- CreateChild($hostentryref->[0]);
- $HostHash{$hostentryref->[0]} = $hostentryref->[4];
- $HostIterator->next();
-}
$RemoteHost = "Parent Server";
# Maintain the population:
ShowStatus("Parent keeping the flock");
-#
-# Set up parent signals:
-#
-
-$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
@@ -1644,11 +2069,14 @@ sub CheckKids {
my $now=time;
my $local=localtime($now);
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");
kill 'USR1' => $pid; # Tell Child to report status.
- sleep 1; # Wait so file doesn't intermix.
}
+
}
=pod
@@ -1681,81 +2109,14 @@ 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.
+ # I'm not sure what I was thinking in the first implementation.
+ # someone will have to work hard to convince me the effect is any
+ # 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
+ # (lost unless they are critical).
- $HostHash{$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.
- }
- }
+ &KillThemAll();
}
@@ -1774,7 +2135,7 @@ sub Restart {
Log("CRITICAL", "Restarting");
my $execdir = $perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");
- exec("$execdir/lonc");
+ exec("$executable");
}
=pod
@@ -1788,18 +2149,39 @@ SIGHUP. Responds to sigint and sigterm.
sub KillThemAll {
Debug(2, "Kill them all!!");
- local($SIG{CHLD}) = 'IGNORE'; # Our children >will< die.
- foreach my $pid (keys %ChildHash) {
- my $serving = $ChildHash{$pid};
- Debug(2, "Killing lonc for $serving pid = $pid");
- ShowStatus("Killing lonc for $serving pid = $pid");
- Log("CRITICAL", "Killing lonc for $serving pid = $pid");
+
+ #local($SIG{CHLD}) = 'IGNORE';
+ # 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");
+ Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
kill 'QUIT' => $pid;
- delete($ChildHash{$pid});
}
- my $execdir = $perlvar{'lonDaemons'};
- unlink("$execdir/logs/lonc.pid");
+ ShowStatus("Finished killing child processes off.");
+}
+
+#
+# Kill all children via KILL. Just in case the
+# first shot didn't get them.
+
+sub really_kill_them_all_dammit
+{
+ Debug(2, "Kill them all Dammit");
+ local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
+ foreach my $pid (keys %ChildPid) {
+ my $serving = $ChildPid{$pid};
+ &ShowStatus("Nastily killing lonc for $serving pid = $pid");
+ Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
+ kill 'KILL' => $pid;
+ delete($ChildPid{$pid});
+ my $execdir = $perlvar{'lonDaemons'};
+ unlink("$execdir/logs/lonc.pid");
+ }
}
=pod
@@ -1811,11 +2193,27 @@ Terminate the system.
=cut
sub Terminate {
- KillThemAll;
+ &Log("CRITICAL", "Asked to kill children.. first be nice...");
+ &KillThemAll;
+ #
+ # By now they really should all be dead.. but just in case
+ # send them all SIGKILL's after a bit of waiting:
+
+ sleep(4);
+ &Log("CRITICAL", "Now kill children nasty");
+ &really_kill_them_all_dammit;
Log("CRITICAL","Master process exiting");
exit 0;
}
+
+sub my_hostname {
+ use Sys::Hostname;
+ my $name = &hostname();
+ &Debug(9,"Name is $name");
+ return $name;
+}
+
=pod
=head1 Theory
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.