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                sub {
                    if ($_[1]) {
                        $_[0]->_fail($_, $_[1]) for @$queue;
                        $stream->close();
                        return;
                    }
                    $self->_write_sentence($stream, $_) for @$queue;
                }
            );
        }
    );

    return $r->{tag};
}

sub _enqueue {
    my ($self, $r) = @_;
    return $self->_connect($r) unless my $queue = $self->{queues}{$r->{loop}};
    push @$queue, $r;
    return $r->{tag};
}

sub _fail_all {
    $_[0]->_fail($_, $_[2])
        for grep { $_->{loop} eq $_[1] } values %{$_[0]->{requests}};
}

sub _finish {
    my ($self, $r, $err) = @_;
    delete $self->{requests}{$r->{tag}};
    if (my $timer = $r->{timeout}) { $r->{loop}->remove($timer) }
    $r->{cb}->($self, ($self->{error} = $err // ''), $r->{data});
}

sub _login {
    my ($self, $loop, $cb) = @_;
    warn "-- trying to log in\n" if DEBUG;

    $loop->delay(
        sub {
            $self->_command($loop, '/login', {}, undef, $_[0]->begin());
        },
        sub {
            my ($delay, $err, $res) = @_;
            return $self->$cb($err) if $err;
            my $secret
                = md5_sum("\x00", $self->password, pack 'H*', $res->[0]{ret});
            $self->_command($loop, '/login',
                {name => $self->user, response => "00$secret"},
                undef, $delay->begin());
        },
        sub {
            $self->$cb($_[1]);
        },
    );
}

sub _read {
    my ($self, $loop, $bytes) = @_;

    warn "-- read bytes from socket: " . (length $bytes) . "\n" if DEBUG;

    my $response = $self->{responses}{$loop} ||= API::MikroTik::Response->new();
    my $data = $response->parse(\$bytes);

    for (@$data) {
        next unless my $r = $self->{requests}{delete $_->{'.tag'}};
        my $type = delete $_->{'.type'};
        push @{$r->{data} ||= Mojo::Collection->new()}, $_
            if %$_ && !$r->{subscription};

        if ($type eq '!re' && $r->{subscription}) {
            $r->{cb}->($self, '', $_);

        }
        elsif ($type eq '!done') {
            $r->{data} ||= Mojo::Collection->new();
            $self->_finish($r);

        }
        elsif ($type eq '!trap' || $type eq '!fatal') {
            $self->_fail($r, $_->{message});
        }
    }
}

sub _send_request {
    my ($self, $r) = @_;
    return $self->_enqueue($r) unless my $stream = $self->{handles}{$r->{loop}};
    return $self->_write_sentence($stream, $r);
}

sub _write_sentence {
    my ($self, $stream, $r) = @_;
    warn "-- writing sentence for tag: $r->{tag}\n" if DEBUG;

    $stream->write($r->{sentence});

    return $r->{tag} if $r->{subscription};

    weaken $self;
    $r->{timeout} = $r->{loop}
        ->timer($self->timeout => sub { $self->_fail($r, 'response timeout') });

    return $r->{tag};
}

1;


=encoding utf8

=head1 NAME

API::MikroTik - Non-blocking interface to MikroTik API

=head1 SYNOPSIS

  my $api = API::MikroTik->new();

  # Blocking