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        },
        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
  my $list = $api->command(
      '/interface/print',
      {'.proplist' => '.id,name,type'},
      {type        => ['ipip-tunnel', 'gre-tunnel'], running => 'true'}
  );
  if (my $err = $api->error) { die "$err\n" }
  printf "%s: %s\n", $_->{name}, $_->{type} for @$list;


  # Non-blocking
  my $tag = $api->command(
      '/system/resource/print',
      {'.proplist' => 'board-name,version,uptime'} => sub {
          my ($api, $err, $list) = @_;
          ...;
      }
  );
  Mojo::IOLoop->start();

  # Subscribe
  $tag = $api->subscribe(
      '/interface/listen' => sub {
          my ($api, $err, $el) = @_;
          ...;
      }
  );
  Mojo::IOLoop->timer(3 => sub { $api->cancel($tag) });
  Mojo::IOLoop->start();

  # Errors handling
  $api->command(
      '/random/command' => sub {
          my ($api, $err, $list) = @_;

          if ($err) {
              warn "Error: $err, category: " . $list->[0]{category};
              return;
          }

          ...;
      }
  );
  Mojo::IOLoop->start();

  # Promises
  $api->cmd_p('/interface/print')
      ->then(sub { my $res = shift }, sub { my ($err, $attr) = @_ })
      ->finally(sub { Mojo::IOLoop->stop() });
  Mojo::IOLoop->start();