Hello Monks, I'm back again requesting assistance. I've been trying to tweak this POE Cookbook example but when I try to increment a variable within a subroutine is does not increment.

#!/usr/bin/perl
use strict;
use warnings;
use POE qw(Component::Server::TCP Component::Client::TCP);

# Spawn the forwarder server on port 8020. When new connections
# arrive, spawn clients to connect them to their destination.

my $sequence_number = '00001';
my $format_sequence_number = sprintf("%s", $sequence_number);
POE::Component::Server::TCP->new(
    Port => 8000,
    ClientConnected => sub {
        my ($heap, $session) = @_[HEAP, SESSION];
        logevent('server got connection', $session);
        spawn_client_side();
    },
    ClientInput => sub {
        my ($kernel, $session, $heap, $input) = 
                @_[KERNEL, SESSION, HEAP, ARG0];
        logevent('server got input', $session, $input);
        $kernel->post($heap->{client_id} => send_stuff => $input);
    },
    ClientDisconnected => sub {
        my ($kernel, $session, $heap) = @_[KERNEL, SESSION, HEAP];
        logevent('server got disconnect', $session);
        $kernel->post($heap->{client_id} => "shutdown");
    },
    InlineStates => {
        send_stuff => sub {
            my ($heap, $stuff) = @_[HEAP, ARG0];
            logevent("sending to server", $_[SESSION]);
            $heap->{client}->put($stuff);
        },
        _child => sub {
            my ($heap, $child_op, $child) = @_[HEAP, ARG0, ARG1];
            if ($child_op eq "create") {
                $heap->{client_id} = $child->ID;
            }
        },
    },
);

sub spawn_client_side {
    POE::Component::Client::TCP->new(
        RemoteAddress => 'localhost',
        RemotePort    => 8001,
        Started          => sub {
            $_[HEAP]->{server_id} = $_[SENDER]->ID;
        },
        Connected => sub {
            my ($heap, $session) = @_[HEAP, SESSION];
            logevent('client connected', $session);
        },
        ServerInput => sub {
            my ($kernel, $heap, $session, $input) = 
                        @_[KERNEL, HEAP, SESSION, ARG0];
            logevent('client got input', $session, $input);
            $kernel->post($heap->{server_id} = send_stuff => $input);
        },
        Disconnected => sub {
            my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION];
            logevent('client disconnected', $session);
            $kernel->post($heap->{server_id} => 'shutdown');
        },
        InlineStates => {
            send_stuff => sub {
                my ($heap, $stuff) = @_[HEAP, ARG0];
                logevent('sending to client', $_[SESSION]);
                if ($stuff =~ /READ/) {
                  $stuff = $format_sequence_number . 'READ' . '00000';
                  $heap->{server}->put($stuff);
                  $sequence_number += 1;
                }
            },
        },
    );
}

sub logevent {
    my ($state, $session, $arg) = @_;
    my $id = $session->ID();
    print "session $id $state ";
    print ": $arg" if (defined $arg);
    print "\n";
}
warn 'running';
$poe_kernel->run();
exit 0;

[download]

I have 2 main goals with this code:

  1. have it auto-increment for each typed message sent by the client from "00001" until it reaches "99999" then have it reset to "00001" with each new client connection (hence the attempted sprintf function)
  2. have 4 unique counters for client-side InlineStates (will add more if/else matching patterns under /READ/)

In reply to POE - can't increment within sub by ljamison

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