Something along the lines of this, not tested, of course.

sub process_request {
    my $self = shift;
    my $fh = $self->{server}->{client};

    my $select = IO::Select->new();
    $select->add($fh);

    my $last = 1;
    while ($last) {
        my $subroutineCall;
        my $command;
        my $completeLine = "";

        # check if anything is ready to be received from client
        my @ready = $select->can_read(.1);
        next unless (@ready);

        # loop while receiving from the client untill a full msg has b
+een received as identified by our flags
        while ( defined( my $line = <$fh> ) ) {
            if ( $line =~ /\*\*\* CLOSE_CONNECTION_CLIENT \*\*\*\n$/ )
+ {
                $logger->info("Client closed connection to the server"
+);
                $last = 0;

                $selSock->remove($fh);
                shutdown( $fh, 2 );
                close $fh;
                last;
            }

            $completeLine .= $line;
            if ( $completeLine
                =~ /(.+) \*\*\* COMMAND_INPUT \*\*\* (.+) \*\*\* COMMA
+ND_INPUT_END \*\*\*\n$/is
                )
            {
                $subroutineCall = $1;
                $command        = $2;
                $logger->info( "Processing message \"" . $command . "\
+"" );

                last;
            }
        }

        if ($last) {

#checking if the subroutine call is defined, if not, it kills that cli
+ent connection (for cases of closing out of a client window and it se
+nding the empty string )
                if ( defined($subroutineCall) )
                {
                    $logger->debug("Calling subroutine '${subroutineCa
+ll}'");

                    my ($string) = executeCommand(
                        subCall => $subroutineCall,
                        command => $command
                    );

                    send( $fh, "$string\n*** ZERO_BYTES_LEFT ***", 0 )
+;
            }
            else {
                    $logger->info(
                        "Undefined subroutine passed, closing client c
+onnection."
                    );
                    $last = 0;

                    $selSock->remove($fh);
                    shutdown( $fh, 2 );
                    close $fh;
                    last;
            }
        }
    }
}
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