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Net::Server::Proto(3)                User Contributed Perl Documentation               Net::Server::Proto(3)



NAME
         Net::Server::Proto - adp0 - Net::Server Protocol compatibility layer

SYNOPSIS
         # Net::Server::Proto and its accompianying modules are not
         # intended to be used outside the scope of Net::Server.

         # That being said, here is how you use them.  This is
         # only intended for anybody wishing to extend the
         # protocols to include some other set (ie maybe a
         # database connection protocol)

         use Net::Server::Proto;

         my $sock = Net::Server::Proto->object(
           $default_host,    # host to use if none found in port
           $port,            # port to connect to
           $default_proto,   # proto to use if none found in port
           $server_obj,      # Net::Server object
           );


         ### Net::Server::Proto will attempt to interface with
         ### sub modules named simillar to Net::Server::Proto::TCP
         ### Individual sub modules will be loaded by
         ### Net::Server::Proto as they are needed.

         use Net::Server::Proto::TCP; # can be TCP/UDP/UNIX/etc

         ### Return an object which is a sub class of IO::Socket
         ### At this point the object is not connected.
         ### The method can gather any other information that it
         ### needs from the server object.
         my $sock = Net::Server::Proto::TCP->object(
           $default_host,    # host to use if none found in port
           $port,            # port to connect to
           $server_obj,      # Net::Server object
           );

         ### Log that a connection is about to occur.
         ### Use the facilities of the passed Net::Server object.
         $sock->log_connect( $server );

         ### Actually bind to port or socket file.  This
         ### is typically done by calling the configure method.
         $sock->connect();

         ### Allow for rebinding to an already open fileno.
         ### Typically will just do an fdopen.
         $sock->reconnect();

         ### Return a unique identifying string for this sock that
         ### can be used when reconnecting.
         my $str = $sock->hup_string();

         ### Return the proto that is being used by this module.
         my $proto = $sock->NS_proto();

DESCRIPTION
       Net::Server::Proto is an intermediate module which returns IO::Socket style objects blessed into its
       own set of classes (ie Net::Server::Proto::TCP, Net::Server::Proto::UNIX).

       Only three or four protocols come bundled with Net::Server.  TCP, UDP, UNIX, and eventually SSL.  TCP
       is an implementation of SOCK_STREAM across an INET socket.  UDP is an implementation of SOCK_DGRAM
       across an INET socket.  UNIX uses a unix style socket file and lets the user choose between
       SOCK_STREAM and SOCK_DGRAM (the default is SOCK_STREAM).  SSL is actually just a layer on top of TCP.

       The protocol that is passed to Net::Server can be the name of another module which contains the
       protocol bindings.  If a protocol of MyServer::MyTCP was passed, the socket would be blessed into
       that class.  If Net::Server::Proto::TCP was passed, it would get that class.  If a bareword, such as
       tcp, udp, unix or ssl, is passed, the word is uppercased, and post pended to "Net::Server::Proto::"
       (ie tcp = Net::Server::Proto::TCP).

METHODS
       Protocol names used by the Net::Server::Proto should be sub classes of IO::Socket.  These classes
       should also contain, as a minimum, the following methods:

       object
           Return an object which is a sub class of IO::Socket At this point the object is not connected.
           The method can gather any other information that it needs from the server object.  Arguments are
           default_host, port, and a Net::Server style server object.

       log_connect
           Log that a connection is about to occur.  Use the facilities of the passed Net::Server object.
           This should be an informative string explaining which properties are being used.

       connect
           Actually bind to port or socket file.  This is typically done internally by calling the configure
           method of the IO::Socket super class.

       reconnect
           Allow for rebinding to an already open fileno.  Typically will just do an fdopen using the
           IO::Socket super class.

       hup_string
           Return a unique identifying string for this sock that can be used when reconnecting.  This is
           done to allow information including the file descriptor of the open sockets to be passed via %ENV
           during an exec.  This string should always be the same based upon the configuration parameters.

       NS_proto
           Net::Server protocol.  Return the protocol that is being used by this module.  This does not have
           to be a registered or known protocol.

       show
           Similar to log_connect, but simply shows a listing of which properties were found.  Can be used
           at any time.

PORT
       The port is the most important argument passed to the sub module classes and to Net::Server::Proto
       itself.  For tcp, udp, and ssl style ports, the form is generally host:port/protocol,
       host|port|protocol, host/port, or port.  For unix the form is generally socket_file|type|unix or
       socket_file.

       You can see what Net::Server::Proto parsed out by looking at the logs to see what log_connect said.
       You could also include a post_bind_hook similar to the following to debug what happened:

         sub post_bind_hook {
           my $self = shift;
           foreach my $sock ( @{ $self->{server}->{sock} } ){
             $self->log(2,$sock->show);
           }
         }

       Rather than try to explain further, please look at the following examples:

         # example 1 ###################################

         $port = "20203";
         $def_host  = "default_domain.com";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::TCP
         # NS_host  = default_domain.com
         # NS_port  = 20203
         # NS_proto = TCP

         # example 2 ###################################

         $port = "someother.com:20203";
         $def_host  = "default_domain.com";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::TCP
         # NS_host  = someother.com
         # NS_port  = 20203
         # NS_proto = TCP

         # example 3 ###################################

         $port = "someother.com:20203/udp";
         $def_host  = "default_domain.com";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::UDP
         # NS_host  = someother.com
         # NS_port  = 20203
         # NS_proto = UDP

         # example 4 ###################################

         $port = "someother.com:20203/Net::Server::Proto::UDP";
         $def_host  = "default_domain.com";
         $def_proto = "TCP";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::UDP
         # NS_host  = someother.com
         # NS_port  = 20203
         # NS_proto = UDP

         # example 5 ###################################

         $port = "someother.com:20203/MyObject::TCP";
         $def_host  = "default_domain.com";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = MyObject::TCP
         # NS_host  = someother.com
         # NS_port  = 20203
         # NS_proto = TCP (depends on MyObject::TCP module)

         # example 6 ###################################

         $port = "/tmp/mysock.file|unix";
         $def_host  = "default_domain.com";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::UNIX
         # NS_host  = undef
         # NS_port  = undef
         # NS_unix_path = /tmp/mysock.file
         # NS_unix_type = SOCK_STREAM
         # NS_proto = UNIX

         # example 7 ###################################

         $port = "/tmp/mysock.file|".SOCK_DGRAM."|unix";
         $def_host  = "";
         $def_proto = "tcp";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::UNIX
         # NS_host  = undef
         # NS_port  = undef
         # NS_unix_path = /tmp/mysock.file
         # NS_unix_type = SOCK_DGRAM
         # NS_proto = UNIX

         # example 8 ###################################

         $port = "/tmp/mysock.file|".SOCK_DGRAM."|unix";
         $def_host  = "";
         $def_proto = "UNIX";
         $obj = Net::Server::Proto->object($def_host,$port,$def_proto);

         # ref      = Net::Server::Proto::UNIX
         # NS_host  = undef
         # NS_port  = undef
         # NS_unix_path = /tmp/mysock.file
         # NS_unix_type = SOCK_DGRAM
         # NS_proto = UNIX

LICENCE
       Distributed under the same terms as Net::Server



perl v5.8.8                                      2001-08-15                            Net::Server::Proto(3)