Diff for /loncom/loncnew between versions 1.77 and 1.89

version 1.77, 2007/03/27 19:38:36 version 1.89, 2010/06/14 13:29:27
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);  use Fcntl qw(:flock);
   
   
Line 73  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  my %listening_to; # Socket->host table for who the parent
                                 # is listening to.                                  # is listening to.
 my %parent_dispatchers;         # host-> listener watcher events.   my %parent_dispatchers;         # host-> listener watcher events. 
Line 87  my $ClientConnection = 0; # Uniquifier f Line 85  my $ClientConnection = 0; # Uniquifier f
   
 my $DebugLevel = 0;  my $DebugLevel = 0;
 my $NextDebugLevel= 2; # So Sigint can toggle this.  my $NextDebugLevel= 2; # So Sigint can toggle this.
 my $IdleTimeout= 600; # Wait 10 minutes 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.  my $executable      = $0; # Get the full path to me.
Line 96  my $executable      = $0; # Get the full Line 94  my $executable      = $0; # Get the full
 #  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 114  my $LondConnecting  = 0;       # True wh Line 114  my $LondConnecting  = 0;       # True wh
   
   
   
 my $DieWhenIdle     = 1; # When true children die when trimmed -> 0.  
 my $hosts_tab       = 1;        # True if we are using a static hosts.tab  
 my $I_am_child      = 0; # True if this is the child process.  my $I_am_child      = 0; # True if this is the child process.
   
 #  #
Line 160  sub LogPerm { Line 158  sub LogPerm {
     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 309  sub SocketTimeout { Line 308  sub SocketTimeout {
     }      }
   
 }  }
   
 #  #
 #   This function should be called by the child in all cases where it must  #   This function should be called by the child in all cases where it must
 #   exit.  If the child process is running with the DieWhenIdle turned on  #   exit.  The child process must create a lock file for the AF_UNIX socket
 #   it must create a lock file for the AF_UNIX socket in order to prevent  #   in order to prevent connection requests from lonnet in the time between
 #   connection requests from lonnet in the time between process exit  #   process exit and the parent picking up the listen again.
 #   and the parent picking up the listen again.  #
 # Parameters:  # Parameters:
 #     exit_code           - Exit status value, however see the next parameter.  #     exit_code           - Exit status value, however see the next parameter.
 #     message             - If this optional parameter is supplied, the exit  #     message             - If this optional parameter is supplied, the exit
Line 325  sub child_exit { Line 325  sub child_exit {
   
     # Regardless of how we exit, we may need to do the lock thing:      # Regardless of how we exit, we may need to do the lock thing:
   
     if($DieWhenIdle) {      #
  #      #  Create a lock file since there will be a time window
  #  Create a lock file since there will be a time window      #  between our exit and the parent's picking up the listen
  #  between our exit and the parent's picking up the listen      #  during which no listens will be done on the
  #  during which no listens will be done on the      #  lonnet client socket.
  #  lonnet client socket.      #
  #      my $lock_file = &GetLoncSocketPath().".lock";
  my $lock_file = &GetLoncSocketPath().".lock";      open(LOCK,">$lock_file");
  open(LOCK,">$lock_file");      print LOCK "Contents not important";
  print LOCK "Contents not important";      close(LOCK);
  close(LOCK);      unlink(&GetLoncSocketPath());
  if ($hosts_tab) {  
     unlink(&GetLoncSocketPath());  
  }  
  exit(0);  
     }  
     #  Now figure out how we exit:  
   
     if($message) {      if ($message) {
  die $message;   die($message);
     } else {      } else {
  exit($exit_code);   exit($exit_code);
     }      }
Line 378  sub Tick { Line 372  sub Tick {
     KillSocket($Socket);      KillSocket($Socket);
     $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.      $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
     UpdateStatus();      UpdateStatus();
     if(($ConnectionCount == 0) && $DieWhenIdle) {      if(($ConnectionCount == 0)) {
  &child_exit(0);   &child_exit(0);
   
     }      }
Line 509  the data and Event->w->fd is the socket Line 503  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 572  sub ClientWritable { Line 569  sub ClientWritable {
  }   }
     } else {      } else {
  $Watcher->cancel(); # A delayed request...just cancel.   $Watcher->cancel(); # A delayed request...just cancel.
    return;
     }      }
 }  }
   
Line 611  sub CompleteTransaction { Line 609  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 1156  sub LondWritable { Line 1154  sub LondWritable {
     }      }
           
 }  }
   
 =pod  =pod
           
 =cut  =cut
   
   
 sub QueueDelayed {  sub QueueDelayed {
     Debug(3,"QueueDelayed called");      Debug(3,"QueueDelayed called");
   
Line 1168  sub QueueDelayed { Line 1168  sub QueueDelayed {
     Debug(4, "Delayed path: ".$path);      Debug(4, "Delayed path: ".$path);
     opendir(DIRHANDLE, $path);      opendir(DIRHANDLE, $path);
   
     my @all_host_ids;      my $host_id_re = '(?:'.join('|',map {quotemeta($_)} (@all_host_ids)).')';
     my $host_iterator =   &LondConnection::GetHostIterator();  
     while (!$host_iterator->end()) {  
  my ($host_id,$host_name) = @{$host_iterator->get()}[0,3];  
  if ($host_name eq $RemoteHost) {  
     push(@all_host_ids, $host_id);  
  }  
  $host_iterator->next();  
     }  
     my $host_id_re = '(?:'.join('|',@all_host_ids).')';  
     my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));      my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));
     closedir(DIRHANDLE);      closedir(DIRHANDLE);
     foreach my $dfname (sort(@alldelayed)) {      foreach my $dfname (sort(@alldelayed)) {
Line 1212  sub MakeLondConnection { Line 1203  sub MakeLondConnection {
   .GetServerPort());    .GetServerPort());
   
     my $Connection = LondConnection->new(&GetServerHost(),      my $Connection = LondConnection->new(&GetServerHost(),
  &GetServerPort());   &GetServerPort(),
    &GetHostId());
   
     if($Connection eq undef) { # Needs to be more robust later.      if($Connection eq undef) { # Needs to be more robust later.
  Log("CRITICAL","Failed to make a connection with lond.");   Log("CRITICAL","Failed to make a connection with lond.");
Line 1220  sub MakeLondConnection { Line 1212  sub MakeLondConnection {
  return 0; # Failure.   return 0; # Failure.
     }  else {      }  else {
   
    $LondConnecting = 1; # Connection in progress.
  # The connection needs to have writability    # The connection needs to have writability 
  # monitored in order to send the init sequence   # monitored in order to send the init sequence
  # that starts the whole authentication/key   # that starts the whole authentication/key
Line 1250  sub MakeLondConnection { Line 1243  sub MakeLondConnection {
  }   }
  Log("SUCESS", "Created connection ".$ConnectionCount   Log("SUCESS", "Created connection ".$ConnectionCount
     ." to host ".GetServerHost());      ." to host ".GetServerHost());
  $LondConnecting = 1; # Connection in progress.  
  return 1; # Return success.   return 1; # Return success.
     }      }
           
Line 1391  sub ClientRequest { Line 1383  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 1413  sub ClientRequest { Line 1414  sub ClientRequest {
 #     Accept a connection request for a client (lonc child) and  #     Accept a connection request for a client (lonc child) and
 #    start up an event watcher to keep an eye on input from that   #    start up an event watcher to keep an eye on input from that 
 #    Event.  This can be called both from NewClient and from  #    Event.  This can be called both from NewClient and from
 #    ChildProcess if we are started in DieWhenIdle mode.  #    ChildProcess.
 # Parameters:  # Parameters:
 #    $socket       - The listener socket.  #    $socket       - The listener socket.
 # Returns:  # Returns:
Line 1502  sub GetServerHost { Line 1503  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 1529  another event handler to subess requests Line 1542  another event handler to subess requests
 =cut  =cut
   
 sub SetupLoncListener {  sub SetupLoncListener {
       my ($host,$SocketName) = @_;
       if (!$host) { $host = &GetServerHost(); }
       if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }
   
     my $host       = GetServerHost(); # Default host.  
     if (@_) {  
  ($host)    = @_ # Override host with parameter.  
     }  
   
     my $socket;  
     my $SocketName = GetLoncSocketPath($host);  
     unlink($SocketName);      unlink($SocketName);
   
       my $socket;
     unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,      unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,
     Listen => 250,       Listen => 250, 
     Type   => SOCK_STREAM)) {      Type   => SOCK_STREAM)) {
Line 1666  Optional parameter: Line 1678  Optional parameter:
 =cut  =cut
   
 sub ChildProcess {  sub ChildProcess {
     #  If we are in DieWhenIdle mode, we've inherited all the      #  We've inherited all the
     #  events of our parent and those have to be cancelled or else      #  events of our parent and those have to be cancelled or else
     #  all holy bloody chaos will result.. trust me, I already made      #  all holy bloody chaos will result.. trust me, I already made
     #  >that< mistake.      #  >that< mistake.
Line 1742  sub ChildProcess { Line 1754  sub ChildProcess {
           
      # &MakeLondConnection(); // let first work request do it.       # &MakeLondConnection(); // let first work request do it.
   
     #  If We are in diwhenidle, need to accept the connection since the      #  need to accept the connection since the event may  not fire.
     #  event may  not fire.  
   
     if ($DieWhenIdle) {      &accept_client($socket);
  &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.
Line 1759  sub ChildProcess { Line 1768  sub ChildProcess {
 #  Create a new child for host passed in:  #  Create a new child for host passed in:
   
 sub CreateChild {  sub CreateChild {
     my ($host, $socket) = @_;      my ($host, $hostid) = @_;
   
     my $sigset = POSIX::SigSet->new(SIGINT);      my $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset);      sigprocmask(SIG_BLOCK, $sigset);
Line 1768  sub CreateChild { Line 1777  sub CreateChild {
     my $pid          = fork;      my $pid          = fork;
     if($pid) { # Parent      if($pid) { # Parent
  $RemoteHost = "Parent";   $RemoteHost = "Parent";
  $ChildHash{$pid} = $host;   $ChildPid{$pid} = $host;
  $HostToPid{$host}= $pid;  
  sigprocmask(SIG_UNBLOCK, $sigset);   sigprocmask(SIG_UNBLOCK, $sigset);
    undef(@all_host_ids);
     } else { # child.      } else { # child.
    $RemoteHostId = $hostid;
  ShowStatus("Connected to ".$RemoteHost);   ShowStatus("Connected to ".$RemoteHost);
  $SIG{INT} = 'DEFAULT';   $SIG{INT} = 'DEFAULT';
  sigprocmask(SIG_UNBLOCK, $sigset);   sigprocmask(SIG_UNBLOCK, $sigset);
  if(defined $socket) {   &ChildProcess(); # Does not return.
     &ChildProcess($socket);  
  } else {  
     ChildProcess; # Does not return.  
  }  
     }      }
 }  }
   
Line 1808  sub parent_client_connection { Line 1813  sub parent_client_connection {
  my ($event)   = @_;   my ($event)   = @_;
  my $watcher   = $event->w;   my $watcher   = $event->w;
  my $socket    = $watcher->fd;   my $socket    = $watcher->fd;
  if ($hosts_tab) {   my $connection = $socket->accept(); # Accept the client connection.
    Event->io(cb      => \&get_remote_hostname,
     # Lookup the host associated with this socket:    poll    => 'r',
     data    => "",
     my $host = $listening_to{$socket};    fd      => $connection);
   
     # Start the child:  
   
   
   
     &Debug(9,"Creating child for $host (parent_client_connection)");  
     &CreateChild($host, $socket);  
       
     # Clean up the listen since now the child takes over until it exits.  
   
     $watcher->cancel(); # Nolonger listening to this event  
     delete($listening_to{$socket});  
     delete($parent_dispatchers{$host});  
     $socket->close();  
   
  } else {  
     my $connection = $socket->accept(); # Accept the client connection.  
     Event->io(cb      => \&get_remote_hostname,  
       poll    => 'r',  
       data    => "",  
       fd      => $connection);  
  }  
     }      }
 }  }
   
 sub get_remote_hostname {  sub get_remote_hostname {
  my ($event)   = @_;      my ($event)   = @_;
  my $watcher   = $event->w;      my $watcher   = $event->w;
  my $socket    = $watcher->fd;      my $socket    = $watcher->fd;
   
  my $thisread;  
  my $rv = $socket->recv($thisread, 1, 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;      my $thisread;
  $watcher->data($data);      my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
  if($data =~ /\n$/) { # Request entirely read.      Debug(8, "rcv:  data length = ".length($thisread)." read =".$thisread);
     chomp($data);      if (!defined($rv) || length($thisread) == 0) {
  } else {   # Likely eof on socket.
     return;   Debug(5,"Client Socket closed on lonc for p_c_c");
  }   close($socket);
    $watcher->cancel();
  &Debug(5,"Creating child for $data (parent_client_connection)");   return;
  &CreateChild($data);      }
   
  # Clean up the listen since now the child takes over until it exits.      my $data    = $watcher->data().$thisread;
  $watcher->cancel(); # Nolonger listening to this event      $watcher->data($data);
  $socket->send("done\n");      if($data =~ /\n$/) { # Request entirely read.
  $socket->close();   chomp($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:  # parent_listen:
Line 1890  sub parent_listen { Line 1878  sub parent_listen {
     my ($loncapa_host) = @_;      my ($loncapa_host) = @_;
     Debug(5, "parent_listen: $loncapa_host");      Debug(5, "parent_listen: $loncapa_host");
   
     my $socket   = &SetupLoncListener($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;      $listening_to{$socket} = $loncapa_host;
     if (!$socket) {      if (!$socket) {
  die "Unable to create a listen socket for $loncapa_host";   die "Unable to create a listen socket for $loncapa_host";
     }      }
           
     my $lock_file = &GetLoncSocketPath($loncapa_host).".lock";      my $lock_file = $file.".lock";
     unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]      unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
   
     my $watcher =       my $watcher = 
Line 1911  sub parent_listen { Line 1907  sub parent_listen {
   
 sub parent_clean_up {  sub parent_clean_up {
     my ($loncapa_host) = @_;      my ($loncapa_host) = @_;
     Debug(5, "parent_clean_up: $loncapa_host");      Debug(1, "parent_clean_up: $loncapa_host");
   
     my $socket_file = &GetLoncSocketPath($loncapa_host);      my $socket_file = &GetLoncSocketPath($loncapa_host);
     unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]      unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]
Line 1920  sub parent_clean_up { Line 1916  sub parent_clean_up {
 }  }
   
   
 # listen_on_all_unix_sockets:  
 #    This sub initiates a listen on all unix domain lonc client sockets.  #    This sub initiates a listen on the common unix domain lonc client socket.
 #    This will be called in the case where we are trimming idle processes.  #    loncnew starts up with no children, and only spawns off children when a
 #    When idle processes are trimmed, loncnew starts up with no children,  #    connection request occurs on the common client unix socket.  The spawned
 #    and only spawns off children when a connection request occurs on the  #    child continues to run until it has been idle a while at which point it
 #    client unix socket.  The spawned child continues to run until it has  #    eventually exits and once more the parent picks up the listen.
 #    been idle a while at which point it eventually exits and once more  
 #    the parent picks up the listen.  
 #  #
 #  Parameters:  #  Parameters:
 #      NONE  #      NONE
Line 1936  sub parent_clean_up { Line 1930  sub parent_clean_up {
 #  Returns:  #  Returns:
 #     NONE  #     NONE
 #  #
 sub listen_on_all_unix_sockets {  
     Debug(5, "listen_on_all_unix_sockets");  
     my $host_iterator      =   &LondConnection::GetHostIterator();  
     while (!$host_iterator->end()) {  
  my $host_entry_ref =   $host_iterator->get();  
  my $host_name      = $host_entry_ref->[3];  
  Debug(9, "Listen for $host_name");  
  &parent_listen($host_name);  
  $host_iterator->next();  
     }  
 }  
   
 sub listen_on_common_socket {  sub listen_on_common_socket {
     Debug(5, "listen_on_common_socket");      Debug(5, "listen_on_common_socket");
     &parent_listen('common');      &parent_listen();
 }  }
   
 #   server_died is called whenever a child process exits.  #   server_died is called whenever a child process exits.
Line 1972  sub server_died { Line 1954  sub server_died {
  }   }
  # need the host to restart:   # need the host to restart:
   
  my $host = $ChildHash{$pid};   my $host = $ChildPid{$pid};
  if($host) { # It's for real...   if($host) { # It's for real...
     &Debug(9, "Caught sigchild for $host");      &Debug(9, "Caught sigchild for $host");
     delete($ChildHash{$pid});      delete($ChildPid{$pid});
     delete($HostToPid{$host});      delete($ChildHost{$host});
     if ($hosts_tab) {      &parent_clean_up($host);
  &parent_listen($host);  
     } else {  
  &parent_clean_up($host);  
     }  
       
  } else {   } else {
     &Debug(5, "Caught sigchild for pid not in hosts hash: $pid");      &Debug(5, "Caught sigchild for pid not in hosts hash: $pid");
  }   }
Line 2038  ShowStatus("Forking node servers"); Line 2016  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;  
   
 if ($DieWhenIdle) {  $RemoteHost = "[parent]";
     $RemoteHost = "[parent]";  &listen_on_common_socket();
     if ($hosts_tab) {  
  &listen_on_all_unix_sockets();  
     } else {  
  &listen_on_common_socket();  
     }  
 } else {  
       
     while (! $HostIterator->end()) {  
   
  my $hostentryref = $HostIterator->get();  
  CreateChild($hostentryref->[0]);  
  $HostHash{$hostentryref->[0]} = $hostentryref->[4];  
  $HostIterator->next();  
     }  
 }  
   
 $RemoteHost = "Parent Server";  $RemoteHost = "Parent Server";
   
Line 2065  $RemoteHost = "Parent Server"; Line 2027  $RemoteHost = "Parent Server";
 ShowStatus("Parent keeping the flock");  ShowStatus("Parent keeping the flock");
   
   
 if ($DieWhenIdle) {  # We need to setup a SIGChild event to handle the exit (natural or otherwise)
     # We need to setup a SIGChild event to handle the exit (natural or otherwise)  # of the children.
     # of the children.  
   
     Event->signal(cb       => \&server_died,  
    desc     => "Child exit handler",  
    signal   => "CHLD");  
   
   
     # Set up all the other signals we set up.  We'll vector them off to the  
     # same subs as we would for DieWhenIdle false and, if necessary, conditionalize  
     # the code there.  
   
     $parent_handlers{INT} = Event->signal(cb       => \&Terminate,  
   desc     => "Parent INT handler",  
   signal   => "INT");  
     $parent_handlers{TERM} = Event->signal(cb       => \&Terminate,  
    desc     => "Parent TERM handler",  
    signal   => "TERM");  
     if ($hosts_tab) {  
  $parent_handlers{HUP}  = Event->signal(cb       => \&Restart,  
        desc     => "Parent HUP handler.",  
        signal   => "HUP");  
     } else {  
  $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";  
   
   
 } else {  
     #  
     #   Set up parent signals:  
     #  
       
     $SIG{INT}  = \&Terminate;  
     $SIG{TERM} = \&Terminate;   
     if ($hosts_tab) {  
  $SIG{HUP}  = \&Restart;  
     } else {  
  $SIG{HUP}  = \&KillThemAll;  
     }  
     $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);  
  }  
     }  
 }  
   
   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 2160  sub CheckKids { Line 2082  sub CheckKids {
     foreach my $host (keys %parent_dispatchers) {      foreach my $host (keys %parent_dispatchers) {
  print $fh "LONC Parent process listening for $host\n";   print $fh "LONC Parent process listening for $host\n";
     }      }
     foreach my $pid (keys %ChildHash) {      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.
     }      }
Line 2204  sub UpdateKids { Line 2126  sub UpdateKids {
     # The down side is transactions that are in flight will get timed out      # The down side is transactions that are in flight will get timed out
     # (lost unless they are critical).      # (lost unless they are critical).
   
     if ($hosts_tab) {      &KillThemAll();
  &Restart();  
     } else {  
  &KillThemAll();  
     }  
 }  }
   
   
Line 2241  SIGHUP.  Responds to sigint and sigterm. Line 2159  SIGHUP.  Responds to sigint and sigterm.
   
 sub KillThemAll {  sub KillThemAll {
     Debug(2, "Kill them all!!");      Debug(2, "Kill them all!!");
     local($SIG{CHLD}) = 'IGNORE';      # Our children >will< die.      
     foreach my $pid (keys %ChildHash) {      #local($SIG{CHLD}) = 'IGNORE';
  my $serving = $ChildHash{$pid};      # Our children >will< die.
       # but we need to catch their death and cleanup after them in case this is 
       # a restart set of kills
       my @allpids = keys(%ChildPid);
       foreach my $pid (@allpids) {
    my $serving = $ChildPid{$pid};
  ShowStatus("Nicely Killing lonc for $serving pid = $pid");   ShowStatus("Nicely Killing lonc for $serving pid = $pid");
  Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");   Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
  kill 'QUIT' => $pid;   kill 'QUIT' => $pid;
     }      }
       ShowStatus("Finished killing child processes off.");
 }  }
   
   
Line 2259  sub really_kill_them_all_dammit Line 2183  sub really_kill_them_all_dammit
 {  {
     Debug(2, "Kill them all Dammit");      Debug(2, "Kill them all Dammit");
     local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.      local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
     foreach my $pid (keys %ChildHash) {      foreach my $pid (keys %ChildPid) {
  my $serving = $ChildHash{$pid};   my $serving = $ChildPid{$pid};
  &ShowStatus("Nastily killing lonc for $serving pid = $pid");   &ShowStatus("Nastily killing lonc for $serving pid = $pid");
  Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");   Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
  kill 'KILL' => $pid;   kill 'KILL' => $pid;
  delete($ChildHash{$pid});   delete($ChildPid{$pid});
  my $execdir = $perlvar{'lonDaemons'};   my $execdir = $perlvar{'lonDaemons'};
  unlink("$execdir/logs/lonc.pid");   unlink("$execdir/logs/lonc.pid");
     }      }
Line 2292  sub Terminate { Line 2216  sub Terminate {
     exit 0;      exit 0;
   
 }  }
   
   sub my_hostname {
       use Sys::Hostname;
       my $name = &hostname();
       &Debug(9,"Name is $name");
       return $name;
   }
   
 =pod  =pod
   
 =head1 Theory  =head1 Theory
Line 2333  A hash of lond connections that have no Line 2265  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.1.77  
changed lines
  Added in v.1.89


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