Running the following server and client scripts:

Server (updated):

#!/usr/bin/perl

use strict;
use warnings;
use feature 'say' ;
use AnyEvent ;
use AnyEvent::Socket ;
use AnyEvent::Handle ;

tcp_server 'unix/', '/tmp/.mysocket', sub {
    my ( $fh, @args ) = @_ ;
    say "Received request" ;
    my $hdl = AnyEvent::Handle->new( fh => $fh ) ; 
    $hdl->push_read(
        line =>  sub {
            my ( $hdl, $line ) = @_ ;
            say "Received $line" ;
        }
    ) ;
}, sub {
    my ( $fh, @sock ) = @_ ;
    say "Bound to @sock" ;
} ;

AnyEvent->condvar->recv ;

exit ;  

Client (updated):

#!/usr/bin/perl

use strict;
use warnings;
use feature 'say' ;
use AnyEvent ;
use AnyEvent::Socket ;
use AnyEvent::Handle ;

my $done = AnyEvent->condvar ;
tcp_connect "unix/", "/tmp/.mysocket", sub {
    my ( $fh ) = @_ or die "unable to connect: $!" ;
    say "Connected" ;
    my $hdl = AnyEvent::Handle->new( fh => $fh ) ;
    $hdl->push_write( "Hello world!\n" ) ;
    $done->send ;
}  ;

$done->recv ;
say $! ;

exit ;

the server receives and accepts the connection request but the client gets an "Illegal seek" error, skips the callback defined in tcp_connect and exits without sending the "Hello world" message to the server.

What am I doing wrong?

Update

Ok.. I figured out that due to the async nature of the AnyEvent module the client gets the "Illegal seek" because the script ends. Adding a condvar variable I solved that (non)problem, but the server still doesn't receives the message sent by client.

CodePudding user response：

I am not sure what causes the "illegal seek error" yet, but I found something that at least works for now. The client needs to use a condition variable in the connection callback:

my $client_done = AnyEvent->condvar;
tcp_connect "unix/", "/tmp/.mysocket", sub {
    my ( $fh ) = @_ or die "unable to connect: $!" ;
    say "Connected" ;
    my $hdl = AnyEvent::Handle->new( fh => $fh ) ;
    $hdl->push_write( "Hello world!\n" ) ;
    $client_done->send;
};
$client_done->recv;
say "Done";

In addition, the server should not use a on_read callback but instead use push_read() method:

my $server_done = AnyEvent->condvar;
tcp_server 'unix/', '/tmp/.mysocket', sub {
    my ( $fh, @args ) = @_ ;
    say "Received request" ;
    my $hdl ;
    $hdl = AnyEvent::Handle->new(
        fh      => $fh,
        on_eof   => sub {
            say "server_eof";
            $server_done->send;
            undef $hdl;
        }
    );
    $hdl->push_read (
        line => sub {
            say "server got line <$_[1]>";
        }
    );
}, sub {
    my ( $fh, @sock ) = @_ ;
    say "Bound to @sock" ;
};
say "Waiting for server done..";
$server_done->recv;