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lib/AnyEvent/RabbitMQ/PubSub/Consumer.pm  view on Meta::CPAN

=cut

has channel => (
    is => 'ro', isa => 'AnyEvent::RabbitMQ::Channel', required => 1
);
has exchange => (
    is => 'ro', isa => 'HashRef', required => 1
);
has queue => (
    is => 'ro', isa => 'HashRef', required => 1
);
has routing_key => (
    is => 'ro', isa => 'Str', default => '#'
);
has prefetch_count => (
    is => 'ro', isa => 'Int', default => 5,
);

=head1 METHODS

=head2 init()

set prefetch_count

declare exchange and queue

=cut

sub init {
    my ($self) = @_;

    $self->channel->qos(prefetch_count => $self->prefetch_count);

    my $cv = AnyEvent->condvar;

    $self->declare_exchange_and_queue()
        ->then( sub { $self->bind_queue() })
        ->then( sub { $cv->send() })
        ->catch(sub { $cv->croak(@_) });

    $cv->recv();
    return
}

=head2 consume($cv, $on_consume)

run consume C<$on_consume> code on channel

return L<Promise>

    my $cv = AnyEvent->condvar();
    $self->consume(
        $cv,
        sub {
            my ($consumer, $msg) = @_;

            ...
        }
    )->then(sub {
        say 'Consumer was started...';
    });


=cut

sub consume {
    my ($self, $cv, $on_consume) = @_;

    my $d = deferred();

    $self->channel->consume(
        queue      => $self->queue->{queue},
        no_ack     => 0,
        on_success => sub { $d->resolve() },
        on_cancel  => sub {AnyEvent::RabbitMQ::PubSub::_report_error($cv, @_)},
        on_failure => sub {AnyEvent::RabbitMQ::PubSub::_report_error($cv, @_)},
        on_consume => sub { $on_consume->($self, @_) },
    );

    return $d->promise
}

=head2 reject_and_republish($msg)

reject (drop) message

and after 10ms (to avoid 100% CPU)

republish message back (to end of queue)

=cut

sub reject_and_republish {
    my ($self, $msg) = @_;

    usleep 10_000; # wait 10 ms before republish to avoid 100 % CPU
    $self->reject($msg);

    $msg->{header}{headers}{trials}++;
    $self->channel->publish(
        body        => $msg->{body}->{payload},
        header      => $msg->{header},
        exchange    => "",
        routing_key => $self->queue->{queue},
    );
}

=head2 reject($msg)

reject (drop) message

=cut

sub reject {
    my ($self, $msg) = @_;

    warn "Message to reject not specified" if !defined $msg;

    my $delivery_tag = $msg->{deliver}{method_frame}{delivery_tag};
    $self->channel->reject(delivery_tag => $delivery_tag);