#####################3 server.pl
use strict;
use warnings;
use diagnostics;
use Time::HiRes qw(time);
use IO::Socket::INET;
use IO::Async::Stream;
use IO::Async::Loop;

my $loop = IO::Async::Loop->new();

my $server_socket = IO::Socket::INET->new(
    Listen    => 5,
    ReuseAddr => 1,
    LocalPort => 8888,
    Proto     => 'tcp',
    Blocking  => 1,     # This line is very important
) or die $!;
$server_socket->autoflush( 1 ) or die $!;

$loop->listen(
    handle =>  $server_socket,

    on_accept => sub {
        my ( $newclient ) = @_;

        $loop->add(
            IO::Async::Stream->new(
                handle => $newclient,

                on_read => sub {
                    my ( $self, $buffref, $closed ) = @_;
#                    $self->write( $$buffref );
                    warn 'READ: ', $$buffref;
                    my $send_start = time;
                    $newclient->send( 'ECHO: ' . $$buffref );
                    warn 'TIME TO SEND TO CLIENT: ', time - $send_start;
                    $$buffref = '';
                    return 0;
                },
            ),
        );
    },

    on_resolve_error => sub { print STDERR "Cannot resolve - $_[0]\n"; },
    on_listen_error  => sub { print STDERR "Cannot listen\n"; },
);

$loop->loop_forever();