Net::Server::Proto(3) User Contributed Perl DocumentationNet::Server::Proto(3)NAMENet::Server::Proto - 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();
DESCRIPTIONNet::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 fol-
lowing 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 config-
uration 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 proto-
col.
show
Similar to log_connect, but simply shows a listing of which proper-
ties 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 exam-
ples:
# 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 2007-02-03 Net::Server::Proto(3)
