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Diff for /loncom/loncnew between versions 1.46 and 1.92

version 1.46, 2004/05/25 15:32:13 version 1.92, 2010/12/21 11:17:03
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.
   
 my $DebugLevel = 0;  my $DebugLevel = 0;
 my $NextDebugLevel= 2; # So Sigint can toggle this.  my $NextDebugLevel= 2; # So Sigint can toggle this.
 my $IdleTimeout= 3600; # Wait an hour before pruning connections.  my $IdleTimeout= 7200; # Wait two hours 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 $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  #   The hash below gives the HTML format for log messages
Line 117  $LogFormats{"WARNING"}  = "<font color=' Line 129  $LogFormats{"WARNING"}  = "<font color='
 $LogFormats{"DEFAULT"}  = " %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  =pod
   
Line 125  $LogFormats{"DEFAULT"}  = " %s "; Line 151  $LogFormats{"DEFAULT"}  = " %s ";
 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'};
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");      my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
       chomp($message);
     print $fh "$now:$message:$local\n";      print $fh "$now:$message:$local\n";
 }  }
   
Line 156  host and the time will be formatted into Line 184  host and the time will be formatted into
 =cut  =cut
   
 sub Log {  sub Log {
     my $severity = shift;  
     my $message  = shift;      my ($severity, $message) = @_;
      
     if(!$LogFormats{$severity}) {      if(!$LogFormats{$severity}) {
  $severity = "DEFAULT";   $severity = "DEFAULT";
     }      }
Line 170  sub Log { Line 198  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 193  Returns the name of the host that a sock Line 221  Returns the name of the host that a sock
 =cut  =cut
   
 sub GetPeername {  sub GetPeername {
     my $connection = shift;  
     my $AdrFamily  = shift;  
       my ($connection, $AdrFamily) = @_;
   
     my $peer       = $connection->peername();      my $peer       = $connection->peername();
     my $peerport;      my $peerport;
     my $peerip;      my $peerip;
Line 217  Invoked to issue a debug message. Line 247  Invoked to issue a debug message.
 =cut  =cut
   
 sub Debug {  sub Debug {
     my $level   = shift;  
     my $message = shift;      my ($level, $message) = @_;
   
     if ($level <= $DebugLevel) {      if ($level <= $DebugLevel) {
  Log("INFO", "-Debug- $message host = $RemoteHost");   Log("INFO", "-Debug- $message host = $RemoteHost");
     }      }
 }  }
   
 sub SocketDump {  sub SocketDump {
     my $level = shift;  
     my $socket= shift;      my ($level, $socket) = @_;
   
     if($level <= $DebugLevel) {      if($level <= $DebugLevel) {
  $socket->Dump();   $socket->Dump(-1); # Ensure it will get dumped.
     }      }
 }  }
   
Line 240  sub SocketDump { Line 272  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 250  sub ShowStatus { Line 283  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");
     Debug(0, " SocketTimeout called: ");      Debug(5, " SocketTimeout called: ");
     $Socket->Dump();      $Socket->Dump(0);
     if(exists($ActiveTransactions{$Socket})) {      if(exists($ActiveTransactions{$Socket})) {
  FailTransaction($ActiveTransactions{$Socket});   FailTransaction($ActiveTransactions{$Socket});
     }      }
Line 269  sub SocketTimeout { Line 303  sub SocketTimeout {
                                 # a connection failure:                                  # a connection failure:
     $ConnectionRetriesLeft--;      $ConnectionRetriesLeft--;
     if($ConnectionRetriesLeft <= 0) {      if($ConnectionRetriesLeft <= 0) {
  Log("CRITICAL", "Host marked dead: ".GetServerHost());   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 ------------------------  #----------------------------- Timer management ------------------------
   
 =pod  =pod
Line 285  Invoked  each timer tick. Line 355  Invoked  each timer tick.
   
   
 sub Tick {  sub Tick {
       my ($Event)       = @_;
       my $clock_watcher = $Event->w;
   
     my $client;      my $client;
     if($ConnectionRetriesLeft > 0) {      UpdateStatus();
  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 370  sub Tick {
  if($IdleSeconds > $IdleTimeout) { # Prune a connection...   if($IdleSeconds > $IdleTimeout) { # Prune a connection...
     my $Socket = $IdleConnections->pop();      my $Socket = $IdleConnections->pop();
     KillSocket($Socket);      KillSocket($Socket);
       $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
       UpdateStatus();
       if(($ConnectionCount == 0)) {
    &child_exit(0);
   
       }
  }   }
     } else {      } else {
  $IdleSeconds = 0; # Reset idle count if not idle.   $IdleSeconds = 0; # Reset idle count if not idle.
Line 319  sub Tick { Line 394  sub 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.
     #      #
           #   Note this code is dead now...
       #
     my $Requests = $WorkQueue->Count();      my $Requests = $WorkQueue->Count();
     if (($ConnectionCount == 0)  && ($Requests > 0)) {       if (($ConnectionCount == 0)  && ($Requests > 0) && (!$LondConnecting)) { 
  if ($ConnectionRetriesLeft > 0) {   if ($ConnectionRetriesLeft > 0) {
     my $Connections = ($Requests <= $MaxConnectionCount) ?      Debug(5,"Work but no connections, Make a new one");
  $Requests : $MaxConnectionCount;      my $success;
     Debug(5,"Work but no connections, start ".$Connections." of them");      $success    = &MakeLondConnection;
     my $successCount = 0;      if($success == 0) { # All connections failed:
     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");   Debug(5,"Work in queue failed to make any connectiouns\n");
  EmptyQueue(); # Fail pending transactions with con_lost.   EmptyQueue(); # Fail pending transactions with con_lost.
  CloseAllLondConnections(); # Should all be closed but....   CloseAllLondConnections(); # Should all be closed but....
     }      }
  } else {   } else {
       $LondConnecting = 0;
     ShowStatus(GetServerHost()." >>> DEAD!!! <<<");      ShowStatus(GetServerHost()." >>> DEAD!!! <<<");
     Debug(5,"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.      EmptyQueue(); # Connections can't be established.
Line 343  sub Tick { Line 416  sub Tick {
  }   }
                 
     }      }
       if ($ConnectionCount == 0) {
    $KeyMode = ""; 
    $clock_watcher->cancel();
       }
       &UpdateStatus();
 }  }
   
 =pod  =pod
Line 363  Trigger disconnections of idle sockets. Line 441  Trigger disconnections of idle sockets.
   
 sub SetupTimer {  sub SetupTimer {
     Debug(6, "SetupTimer");      Debug(6, "SetupTimer");
     Event->timer(interval => 1, cb => \&Tick );      Event->timer(interval => 1, cb => \&Tick,
    hard => 1);
 }  }
   
 =pod  =pod
Line 383  long enough, it will be shut down and re Line 462  long enough, it will be shut down and re
   
 sub ServerToIdle {  sub ServerToIdle {
     my $Socket   = shift; # Get the socket.      my $Socket   = shift; # Get the socket.
       $KeyMode = $Socket->{AuthenticationMode};
     delete($ActiveTransactions{$Socket}); # Server has no transaction      delete($ActiveTransactions{$Socket}); # Server has no transaction
   
     &Debug(5, "Server to idle");      &Debug(5, "Server to idle");
Line 424  the data and Event->w->fd is the socket Line 504  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 462  sub ClientWritable { Line 545  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!!   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;      $Watcher->cancel;
     $Socket->shutdown(2);      $Socket->shutdown(2);
     $Socket->close();      $Socket->close();
Line 487  sub ClientWritable { Line 570  sub ClientWritable {
  }   }
     } else {      } else {
  $Watcher->cancel(); # A delayed request...just cancel.   $Watcher->cancel(); # A delayed request...just cancel.
    return;
     }      }
 }  }
   
Line 515  The transaction that is being completed. Line 599  The transaction that is being completed.
   
 sub CompleteTransaction {  sub CompleteTransaction {
     &Debug(5,"Complete transaction");      &Debug(5,"Complete transaction");
     my $Socket = shift;  
     my $Transaction = shift;      my ($Socket, $Transaction) = @_;
   
     if (!$Transaction->isDeferred()) { # Normal transaction      if (!$Transaction->isDeferred()) { # Normal transaction
  my $data   = $Socket->GetReply(); # Data to send.   my $data   = $Socket->GetReply(); # Data to send.
Line 526  sub CompleteTransaction { Line 610  sub CompleteTransaction {
  StartClientReply($Transaction, $data);   StartClientReply($Transaction, $data);
     } else { # Delete deferred transaction file.      } else { # Delete deferred transaction file.
  Log("SUCCESS", "A delayed transaction was completed");   Log("SUCCESS", "A delayed transaction was completed");
  LogPerm("S:$Transaction->getClient() :".$Transaction->getRequest());   LogPerm("S:".$Transaction->getClient().":".$Transaction->getRequest());
  unlink $Transaction->getFile();   unlink($Transaction->getFile());
     }      }
 }  }
   
Line 550  sub CompleteTransaction { Line 634  sub CompleteTransaction {
 =cut  =cut
   
 sub StartClientReply {  sub StartClientReply {
     my $Transaction   = shift;  
     my $data     = shift;  
   
       my ($Transaction, $data) = @_;
   
     my $Client   = $Transaction->getClient();      my $Client   = $Transaction->getClient();
   
Line 591  Parameters: Line 674  Parameters:
   
 sub FailTransaction {  sub FailTransaction {
     my $transaction = shift;      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.      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 602  sub FailTransaction { Line 691  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 623  sub EmptyQueue { Line 714  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{$Socket})) {
Line 631  sub CloseAllLondConnections { Line 723  sub CloseAllLondConnections {
       KillSocket($Socket);        KillSocket($Socket);
     }      }
 }  }
 =cut  
   
 =pod  =pod
   
Line 653  Parameters: Line 744  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 671  sub KillSocket { Line 762  sub KillSocket {
  delete ($ActiveTransactions{$Socket});   delete ($ActiveTransactions{$Socket});
     }      }
     if(exists($ActiveConnections{$Socket})) {      if(exists($ActiveConnections{$Socket})) {
    $ActiveConnections{$Socket}->cancel;
  delete($ActiveConnections{$Socket});   delete($ActiveConnections{$Socket});
  $ConnectionCount--;   $ConnectionCount--;
  if ($ConnectionCount < 0) { $ConnectionCount = 0; }   if ($ConnectionCount < 0) { $ConnectionCount = 0; }
Line 682  sub KillSocket { Line 774  sub KillSocket {
  EmptyQueue();   EmptyQueue();
  CloseAllLondConnections; # Should all already be closed but...   CloseAllLondConnections; # Should all already be closed but...
     }      }
       UpdateStatus();
 }  }
   
 =pod  =pod
Line 778  sub LondReadable { Line 871  sub LondReadable {
     "Lond connection lost.");      "Lond connection lost.");
  if(exists($ActiveTransactions{$Socket})) {   if(exists($ActiveTransactions{$Socket})) {
     FailTransaction($ActiveTransactions{$Socket});      FailTransaction($ActiveTransactions{$Socket});
    } else {
       #  Socket is connecting and failed... need to mark
       #  no longer connecting.
      
       $LondConnecting = 0;
  }   }
  $Watcher->cancel();   $Watcher->cancel();
  KillSocket($Socket);   KillSocket($Socket);
Line 852  sub LondReadable { Line 950  sub LondReadable {
  .$RemoteHost." now ready for action");   .$RemoteHost." now ready for action");
  }   }
  ServerToIdle($Socket); # Next work unit or idle.   ServerToIdle($Socket); # Next work unit or idle.
   
    #
    $LondConnecting = 0; # Best spot I can think of for this.
    # 
   
     } elsif ($State eq "SendingRequest") {      } elsif ($State eq "SendingRequest") {
  #  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 965  sub LondWritable { Line 1067  sub LondWritable {
     " has been disconnected");      " has been disconnected");
  if(exists($ActiveTransactions{$Socket})) {   if(exists($ActiveTransactions{$Socket})) {
     FailTransaction($ActiveTransactions{$Socket});      FailTransaction($ActiveTransactions{$Socket});
    } else {
       #  In the process of conneting, so need to turn that off.
       
       $LondConnecting = 0;
  }   }
  $Watcher->cancel();   $Watcher->cancel();
  KillSocket($Socket);   KillSocket($Socket);
Line 1051  sub LondWritable { Line 1157  sub LondWritable {
     }      }
           
 }  }
   
 =pod  =pod
           
 =cut  =cut
   
   
 sub QueueDelayed {  sub QueueDelayed {
     Debug(3,"QueueDelayed called");      Debug(3,"QueueDelayed called");
   
Line 1061  sub QueueDelayed { Line 1170  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 1097  sub MakeLondConnection { Line 1206  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) {
  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 {
   
    $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 1112  sub MakeLondConnection { Line 1223  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 1125  sub MakeLondConnection { Line 1236  sub MakeLondConnection {
    data     => $Connection,     data     => $Connection,
    desc => 'Connection to lond server');     desc => 'Connection to lond server');
  $ActiveConnections{$Connection} = $event;   $ActiveConnections{$Connection} = $event;
    if ($ConnectionCount == 0) {
       &SetupTimer; # Need to handle timeouts with connections...
    }
  $ConnectionCount++;   $ConnectionCount++;
  Debug(4, "Connection count = ".$ConnectionCount);   Debug(4, "Connection count = ".$ConnectionCount);
  if($ConnectionCount == 1) { # First Connection:   if($ConnectionCount == 1) { # First Connection:
Line 1164  The text of the request to send. Line 1277  The text of the request to send.
 =cut  =cut
   
 sub StartRequest {  sub StartRequest {
     my $Lond     = shift;  
     my $Request  = shift; # This is a LondTransaction.      my ($Lond, $Request) = @_;
           
     Debug(6, "StartRequest: ".$Request->getRequest());      Debug(6, "StartRequest: ".$Request->getRequest());
   
Line 1216  sub QueueTransaction { Line 1329  sub QueueTransaction {
     if(!defined $LondSocket) { # Need to queue request.      if(!defined $LondSocket) { # Need to queue request.
  Debug(5,"Must queue...");   Debug(5,"Must queue...");
  $WorkQueue->enqueue($requestData);   $WorkQueue->enqueue($requestData);
  if($ConnectionCount < $MaxConnectionCount) {   Debug(5, "Queue Transaction startnew $ConnectionCount $LondConnecting");
    if(($ConnectionCount < $MaxConnectionCount)   && (! $LondConnecting)) {
   
     if($ConnectionRetriesLeft > 0) {      if($ConnectionRetriesLeft > 0) {
  Debug(5,"Starting additional lond connection");   Debug(5,"Starting additional lond connection");
  if(MakeLondConnection() == 0) {   if(&MakeLondConnection() == 0) {
     EmptyQueue(); # Fail transactions, can't make connection.      EmptyQueue(); # Fail transactions, can't make connection.
     CloseAllLondConnections; # Should all be closed but...      CloseAllLondConnections; # Should all be closed but...
  }   }
     } else {      } else {
  ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");   ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");
    $LondConnecting = 0;
  EmptyQueue(); # It's worse than that ... he's dead Jim.   EmptyQueue(); # It's worse than that ... he's dead Jim.
  CloseAllLondConnections; # Should all be closed but..   CloseAllLondConnections; # Should all be closed but..
     }      }
Line 1270  sub ClientRequest { Line 1386  sub ClientRequest {
     $data = $data.$thisread; # Append new data.      $data = $data.$thisread; # Append new data.
     $watcher->data($data);      $watcher->data($data);
     if($data =~ /\n$/) { # Request entirely read.      if($data =~ /\n$/) { # Request entirely read.
  if($data eq "close_connection_exit\n") {   if ($data eq "close_connection_exit\n") {
     Log("CRITICAL",      Log("CRITICAL",
  "Request Close Connection ... exiting");   "Request Close Connection ... exiting");
     CloseAllLondConnections();      CloseAllLondConnections();
     exit;      exit;
    } elsif ($data eq "reset_retries\n") {
       Log("INFO", "Resetting Connection Retries.");
       $ConnectionRetriesLeft = $ConnectionRetries;
       &UpdateStatus();
       my $Transaction = LondTransaction->new($data);
       $Transaction->SetClient($socket);
       StartClientReply($Transaction, "ok\n");
       $watcher->cancel();
       return;
  }   }
  Debug(8, "Complete transaction received: ".$data);   Debug(8, "Complete transaction received: ".$data);
  if($LogTransactions) {   if ($LogTransactions) {
     Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.      Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.
  }   }
  my $Transaction = LondTransaction->new($data);   my $Transaction = LondTransaction->new($data);
Line 1288  sub ClientRequest { Line 1413  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 1306  sub NewClient { Line 1465  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 1330  sub NewClient { Line 1476  sub NewClient {
 Returns the name of the UNIX socket on which to listen for client  Returns the name of the UNIX socket on which to listen for client
 connections.  connections.
   
   =head2 Parameters:
   
       host (optional)  - Name of the host socket to return.. defaults to
                          the return from GetServerHost().
   
 =cut  =cut
   
 sub GetLoncSocketPath {  sub GetLoncSocketPath {
     return $UnixSocketDir."/".GetServerHost();  
       my $host = GetServerHost(); # Default host.
       if (@_) {
    ($host)  = @_; # Override if supplied.
       }
       return $UnixSocketDir."/".$host;
 }  }
   
 =pod  =pod
Line 1350  sub GetServerHost { Line 1506  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 1370  connection.  The event handler establish Line 1538  connection.  The event handler establish
 (creating a communcations channel), that int turn will establish  (creating a communcations channel), that int turn will establish
 another event handler to subess requests.  another event handler to subess requests.
   
   =head2  Parameters:
   
      host (optional)   Name of the host to set up a unix socket to.
   
 =cut  =cut
   
 sub SetupLoncListener {  sub SetupLoncListener {
       my ($host,$SocketName) = @_;
       if (!$host) { $host = &GetServerHost(); }
       if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }
   
   
     my $socket;  
     my $SocketName = GetLoncSocketPath();  
     unlink($SocketName);      unlink($SocketName);
   
       my $socket;
     unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,      unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,
     Listen => 10,       Listen => 250, 
     Type   => SOCK_STREAM)) {      Type   => SOCK_STREAM)) {
  die "Failed to create a lonc listner socket";   if($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 1415  into the status file. Line 1592  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 1423  sub ChildStatus { Line 1601  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();      $Socket->Dump(-1); # Ensure it gets dumped..
     $i++;      $i++;
  }   }
     }      }
       flock(LOG,LOCK_UN);
       close(LOG);
     $ConnectionRetriesLeft = $ConnectionRetries;      $ConnectionRetriesLeft = $ConnectionRetries;
       UpdateStatus();
 }  }
   
 =pod  =pod
Line 1463  sub SignalledToDeath { Line 1646  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 1484  sub ToggleDebug { Line 1669  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 1512  sub ChildProcess { Line 1733  sub ChildProcess {
   cb       => \&ToggleDebug,    cb       => \&ToggleDebug,
   data     => "INT");    data     => "INT");
   
     SetupTimer();      #  Figure out if we got passed a socket or need to open one to listen for
           #  client requests.
     SetupLoncListener();  
       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 ".$RemoteHost);      Debug(9, "Making initial lond connection for ".$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, $hostid) = @_;
   
     my $sigset = POSIX::SigSet->new(SIGINT);      my $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset);      sigprocmask(SIG_BLOCK, $sigset);
     my $host = shift;  
     $RemoteHost = $host;      $RemoteHost = $host;
       ShowStatus('Parent keeping the flock'); # Update time in status message.
     Log("CRITICAL", "Forking server for ".$host);      Log("CRITICAL", "Forking server for ".$host);
     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 1603  ShowStatus("Forking node servers"); Line 2020  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 1661  sub CheckKids { Line 2083  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 1698  sub UpdateKids { Line 2123  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.  
       
     # 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) {      &KillThemAll();
  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 1791  sub Restart { Line 2149  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 1805  SIGHUP.  Responds to sigint and sigterm. Line 2163  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.
  Debug(2, "Killing lonc for $serving pid = $pid");      # but we need to catch their death and cleanup after them in case this is 
  ShowStatus("Killing lonc for $serving pid = $pid");      # a restart set of kills
  Log("CRITICAL", "Killing lonc for $serving pid = $pid");      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;   kill 'QUIT' => $pid;
  delete($ChildHash{$pid});  
     }      }
     my $execdir = $perlvar{'lonDaemons'};      ShowStatus("Finished killing child processes off.");
     unlink("$execdir/logs/lonc.pid");  }
   
   
   #
   #  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  =pod
Line 1828  Terminate the system. Line 2207  Terminate the system.
 =cut  =cut
   
 sub Terminate {  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");      Log("CRITICAL","Master process exiting");
     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
Line 1874  A hash of lond connections that have no Line 2269  A hash of lond connections that have no
 can be closed if they are idle for a long enough time.  can be closed if they are idle for a long enough time.
   
 =cut  =cut
   
   =pod
   
   =head1 Log messages
   
   The following is a list of log messages that can appear in the 
   lonc.log file.  Each log file has a severity and a message.
   
   =over 2
   
   =item Warning  A socket timeout was detected
   
   If there are pending transactions in the socket's queue,
   they are failed (saved if critical).  If the connection
   retry count gets exceeded by this, the
   remote host is marked as dead.
   Called when timeouts occured during the connection and
   connection dialog with a remote host.
   
   =item Critical Host makred DEAD <hostname>   
   
   The numer of retry counts for contacting a host was
   exceeded. The host is marked dead an no 
   further attempts will be made by that child.
   
   =item Info lonc pipe client hung up on us     
   
   Write to the client pipe indicated no data transferred
   Socket to remote host is shut down.  Reply to the client 
   is discarded.  Note: This is commented out in &ClientWriteable
   
   =item Success  Reply from lond: <data>   
   
   Can be enabled for debugging by setting LogTransactions to nonzero.
   Indicates a successful transaction with lond, <data> is the data received
   from the remote lond.
   
   =item Success A delayed transaction was completed  
   
   A transaction that must be reliable was executed and completed
   as lonc restarted.  This is followed by a mesage of the form
   
     S: client-name : request
   
   =item WARNING  Failing transaction <cmd>:<subcmd>  
   
   Transaction failed on a socket, but the failure retry count for the remote
   node has not yet been exhausted (the node is not yet marked dead).
   cmd is the command, subcmd is the subcommand.  This results from a con_lost
   when communicating with lond.
   
   =item WARNING Shutting down a socket     
   
   Called when a socket is being closed to lond.  This is emitted both when 
   idle pruning is being done and when the socket has been disconnected by the remote.
   
   =item WARNING Lond connection lost.
   
   Called when a read from lond's socket failed indicating lond has closed the 
   connection or died.  This should be followed by one or more
   
    "WARNING Failing transaction..." msgs for each in-flight or queued transaction.
   
   =item INFO Connected to lond version:  <version> 
   
   When connection negotiation is complete, the lond version is requested and logged here.
   
   =item SUCCESS Connection n to host now ready for action
   
   Emitted when connection has been completed with lond. n is then number of 
   concurrent connections and host, the host to which the connection has just
   been established.
   
   =item WARNING Connection to host has been disconnected
   
   Write to a lond resulted in failure status.  Connection to lond is dropped.
   
   =item SUCCESS Created connection n to host host 
   
   Initial connection request to host..(before negotiation).
   
   =item CRITICAL Request Close Connection ... exiting
   
   Client has sent "close_connection_exit"   The loncnew server is exiting.
   
   =item INFO Resetting Connection Retries 
   
   Client has sent "reset_retries" The lond connection retries are reset to zero for the
   corresponding lond.
   
   =item SUCCESS Transaction <data>
   
   Only emitted if the global variable $LogTransactions was set to true.
   A client has requested a lond transaction <data> is the contents of the request.
   
   =item SUCCESS Toggled transaction logging <LogTransactions>
                                       
   The state of the $LogTransactions global has been toggled, and its current value
   (after being toggled) is displayed.  When non zero additional logging of transactions
   is enabled for debugging purposes.  Transaction logging is toggled on receipt of a USR2
   signal.
   
   =item CRITICAL Abnormal exit. Child <pid> for <host> died thorugh signal.
   
   QUIT signal received.  lonc child process is exiting.
   
   =item SUCCESS New debugging level for <RemoteHost> now <DebugLevel>
                                       
   Debugging toggled for the host loncnew is talking with.
   Currently debugging is a level based scheme with higher number 
   conveying more information.  The daemon starts out at
   DebugLevel 0 and can toggle back and forth between that and
   DebugLevel 2  These are controlled by
   the global variables $DebugLevel and $NextDebugLevel
   The debug level can go up to 9.
   SIGINT toggles the debug level.  The higher the debug level the 
   more debugging information is spewed.  See the Debug
   sub in loncnew.
   
   =item CRITICAL Forking server for host  
   
   A child is being created to service requests for the specified host.
   
   
   =item WARNING Request for a second child on hostname
                                       
   Somehow loncnew was asked to start a second child on a host that already had a child
   servicing it.  This request is not honored, but themessage is emitted.  This could happen
   due to a race condition.  When a client attempts to contact loncnew for a new host, a child
   is forked off to handle the requests for that server.  The parent then backs off the Unix
   domain socket leaving it for the child to service all requests.  If in the time between
   creating the child, and backing off, a new connection request comes in to the unix domain
   socket, this could trigger (unlikely but remotely possible),.
   
   =item CRITICAL ------ Starting Children ----
   
   This message should probably be changed to "Entering event loop"  as the loncnew only starts
   children as needed.  This message is emitted as new events are established and
   the event processing loop is entered.
   
   =item INFO Updating connections via SIGUSR2
                                       
   SIGUSR2 received. The original code would kill all clients, re-read the host file,
   then restart children for each host.  Now that childrean aree started on demand, this
   just kills all child processes and lets requests start them as needed again.
   
   
   =item CRITICAL Restarting
   
   SigHUP received.  all the children are killed and the script exec's itself to start again.
   
   =item CRITICAL Nicely killing lonc for host pid = <pid>
   
   Attempting to kill the child that is serving the specified host (pid given) cleanly via
   SIGQUIT  The child should handle that, clean up nicely and exit.
   
   =item CRITICAL Nastily killing lonc for host pid = <pid>
   
   The child specified did not die when requested via SIGQUIT.  Therefore it is killed
   via SIGKILL.
   
   =item CRITICAL Asked to kill children.. first be nice..
   
   In the parent's INT handler.  INT kills the child processes.  This inidicate loncnew
   is about to attempt to kill all known children via SIGQUIT.  This message should be followed 
   by one "Nicely killing" message for each extant child.
   
   =item CRITICAL Now kill children nasty 
   
   In the parent's INT handler. remaining children are about to be killed via
   SIGKILL. Should be followed by a Nastily killing... for each lonc child that 
   refused to die.
   
   =item CRITICAL Master process exiting
   
   In the parent's INT handler. just prior to the exit 0 call.
   
   =back
   
   =cut
Removed from v.1.46  
changed lines
  Added in v.1.92

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