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Posts Tagged ‘Net::Server’

A Simple Perl Server

Posted in Programming, tagged , , , on May 7, 2009| 4 Comments »

So much for good intentions. I get myself all geared up to
the problem I need to solve today? Well, I want to find out about how emacs networking works.

So first, I need a simple server to play with. Now normally when I think server I automatically think Apache but this time I want something a bit more basic. And if I was thinking enterprise1 I might reach for C++/ACE. However, for something basic, Perl is ideal.

I’ve just upgraded to Ubuntu 9.04 on this box and Perl is unused so let’s see if it has what I need.

06.52 Ubuntu finishes booting

I waste a few minutes on the internet.

06.57 I start Emacs

and remind myself just how gorgeous emacs-23 looks.

06.59 I check for the Net::Server package

$ perldoc Net::Server
You need to install the perl-doc package to use this program.
$ sudo apt-get install perl-doc

$ perldoc Net::Server
No documentation found for "Net::Server".

It is not installed. I could install it using apt (it is called libnet-server-perl) but I’ve got in the habit of using Perl’s CPAN module which provides package management facilities too. The advantage is that it is somewhat consistent across platforms.

$ sudo perl -MCPAN -e shell

cpan[1]> install YAML
cpan[2]> install CPAN
cpan[3]> reload CPAN
cpan[4]> install Bundle::CPAN

The CPAN bundle installs quite a bit so I go for breakfast.

07.15 Back from breakfast

cpan[5]> install Net::Server

I took this code pretty much straight from perldoc Net::Server.

#!/usr/bin/perl

use strict;
use warnings;

package SimpleServer;

use base qw(Net::Server);

sub process_request
{
    while (<STDIN>) {
        s/\r?\n$//;
        print STDERR "Received [$_]\n";
        last if /quit/i;
    }
}

SimpleServer->run(port => 8080);

I tested it using telnet localhost 8080 to confirm it does what I need.

07.20 All done

Presumably Python and Ruby have similar incantations that will get a server up and running quickly.

And unfortunately at this point I have to go to work. But later on, I can begin experimenting with emacs networking.

1. i.e. some thing that grows humongous over a period of two years and then no-one wants to work with it anymore.

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