Creating A Single Threaded Server with AnyEvent (Perl)
- by David Williams
I'm working on creating a local service to listen on localhost and provide a basic call and response type interface. What I'd like to start with is a baby server that you can connect to over telnet and echoes what it receives.
I've heard AnyEvent is great for this, but the documentation for AnyEvent::Socket does not give a very good example how to do this. I'd like to build this with AnyEvent, AnyEvent::Socket and AnyEvent::Handle.
Right now the little server code looks like this:
#!/usr/bin/env perl
use AnyEvent;
use AnyEvent::Handle;
use AnyEvent::Socket;
my $cv = AnyEvent->condvar;
my $host = '127.0.0.1';
my $port = 44244;
tcp_server($host, $port, sub {
my($fh) = @_;
my $cv = AnyEvent->condvar;
my $handle;
$handle = AnyEvent::Handle->new(
fh => $fh,
poll => "r",
on_read => sub {
my($self) = @_;
print "Received: " . $self->rbuf . "\n";
$cv->send;
}
);
$cv->recv;
});
print "Listening on $host\n";
$cv->wait;
This doesn't work and also if I telnet to localhost:44244 I get this:
EV: error in callback (ignoring): AnyEvent::CondVar:
recursive blocking wait attempted at server.pl line 29.
I think if I understand how to make a mini, single threaded server that simply prints out whatever its given and then waits for more input, I could take it a lot further from there. Any ideas?
