#!/usr/bin/perl -w

# A simple socket client that uses a two-handle wheel to pipe between
# a socket and the console.  It's hardcoded to talk with wheels.perl's
# rot13 server on localhost port 32100.

use strict;
use lib '../lib';
use POSIX;

BEGIN {
  die "This example uses the console, but $^O doesn't support select() on console handles, sorry." if $^O eq "MSWin32";
}

use POE qw(Wheel::SocketFactory Wheel::ReadWrite Driver::SysRW Filter::Stream);

my $rot13_port = 32100;

#==============================================================================
# A client socket session that pipes between a connected socket and
# the console.  It has two phases of operation: Connect phase, and
# Interact phase.

#------------------------------------------------------------------------------
# Start the session by trying to connect to a server.  Create a
# SocketFactory, then sit back until something occurs.

sub session_start {
  my ($kernel, $heap, $connected_socket) = @_[KERNEL, HEAP, ARG0];

  print "Connecting...\n";

  $heap->{connector} = POE::Wheel::SocketFactory->new(
    RemoteAddress => '127.0.0.1',
    RemotePort    => $rot13_port,
    SuccessEvent  => 'connect_success',
    FailureEvent  => 'connect_failure',
  );
}

#------------------------------------------------------------------------------
# The connection succeeded.  Discard the spent SocketFactory, and
# start two ReadWrite wheels to pipe data back and forth.  NOTE: This
# doesn't do terminal characteristic games, so I/O may be choppy or
# otherwise icky.

sub session_connect_success {
  my ($heap, $kernel, $connected_socket) = @_[HEAP, KERNEL, ARG0];

  delete $heap->{connector};

  $heap->{console_wheel} = POE::Wheel::ReadWrite->new(
    InputHandle  => \*STDIN,
    OutputHandle => \*STDOUT,
    Driver => POE::Driver::SysRW->new,
    Filter => POE::Filter::Stream->new,
    InputEvent => 'console_input',
    ErrorEvent => 'console_error',
  );

  $heap->{socket_wheel} = POE::Wheel::ReadWrite->new(
    Handle => $connected_socket,
    Driver => POE::Driver::SysRW->new,
    Filter => POE::Filter::Stream->new,
    InputEvent => 'socket_input',
    ErrorEvent => 'socket_error',
  );

  $heap->{console_wheel}->put("Begun terminal session.");
}

#------------------------------------------------------------------------------
# The connection failed.  Close down everything so that POE will reap
# the session and exit.

sub session_connect_failure {
  my ($heap, $operation, $errnum, $errstr) = @_[HEAP, ARG0, ARG1, ARG2];
  if ($errnum) {
    print "!!! Connecting: $operation error $errnum: $errstr\n";
  }
  delete $heap->{connector};
  delete $heap->{console_wheel};
  delete $heap->{socket_wheel};
}

#------------------------------------------------------------------------------
# The session has stopped.  Delete the wheels once again, just for
# redundancy's sake.

sub session_stop {
  my $heap = $_[HEAP];
  delete $heap->{connector};
  delete $heap->{console_wheel};
  delete $heap->{socket_wheel};
}

#------------------------------------------------------------------------------
# Console input has arrived.  Send it to the socket.

sub session_console_input {
  $_[HEAP]->{socket_wheel}->put($_[ARG0]);
}

#------------------------------------------------------------------------------
# There has been an error on one of the console filehandles.  Close
# down everything so that POE will reap the session and exit.

sub session_console_error {
  my ($heap, $operation, $errnum, $errstr) = @_[HEAP, ARG0, ARG1, ARG2];
  if ($errnum) {
    print "!!! Console: $operation error $errnum: $errstr\n";
  }
  delete $heap->{console_wheel};
  delete $heap->{socket_wheel};
}

#------------------------------------------------------------------------------
# Socket input has arrived.  Send it to the console.

sub session_socket_input {
  $_[HEAP]->{console_wheel}->put($_[ARG0]);
}

#------------------------------------------------------------------------------
# A socket error has occurred.  Close down everything so that POE will
# reap the session and exit.

sub session_socket_error {
  my ($heap, $operation, $errnum, $errstr) = @_[HEAP, ARG0, ARG1, ARG2];
  if ($errnum) {
    print "!!! Socket: $operation error $errnum: $errstr\n";
  }
  delete $heap->{console_wheel};
  delete $heap->{socket_wheel};
}

#==============================================================================
# Start the Session, which will fire off the _start event and begin
# the connection.

POE::Session->create(
  inline_states => {
    _start => \&session_start,
    _stop  => \&session_stop,

    connect_success => \&session_connect_success,
    connect_failure => \&session_connect_failure,

    console_input   => \&session_console_input,
    console_error   => \&session_console_error,

    socket_input    => \&session_socket_input,
    socket_error    => \&session_socket_error,
  },
);

$poe_kernel->run();

exit;