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package Mojo::RabbitMQ::Client::Consumer;
use Mojo::Base 'Mojo::EventEmitter';
use Mojo::Promise;
use Scalar::Util 'weaken';
require Mojo::RabbitMQ::Client;
use constant DEBUG => $ENV{MOJO_RABBITMQ_DEBUG} // 0;
has url => undef;
has client => undef;
has channel => undef;
has queue => undef;
has setup => 0;
has defaults => sub { {} };
sub consume_p {
my $self = shift;
my $promise = Mojo::Promise->new()->resolve();
weaken $self;
unless ($self->client) {
$promise = $promise->then(
sub {
warn "-- spawn new client\n" if DEBUG;
my $client_promise = Mojo::Promise->new();
my $client = Mojo::RabbitMQ::Client->new(url => $self->url);
$self->client($client);
# Catch all client related errors
$self->client->catch(sub { $client_promise->reject($_[1]) });
# When connection is in Open state, open new channel
$client->on(
open => sub {
warn "-- client open\n" if DEBUG;
$client_promise->resolve;
}
);
$client->on('close' => sub { shift; $self->emit('close', @_) });
# Start connection
$client->connect;
return $client_promise;
}
);
}
# Create a new channel with auto-assigned id
unless ($self->channel) {
$promise = $promise->then(
sub {
warn "-- create new channel\n" if DEBUG;
my $channel_promise = Mojo::Promise->new;
my $channel = Mojo::RabbitMQ::Client::Channel->new();
$channel->catch(sub { $channel_promise->reject($_[1]) });
$channel->on(close => sub { warn 'Channel closed: ' . $_[1]->method_frame->reply_text; });
$channel->on(
open => sub {
my ($channel) = @_;
warn "-- channel opened\n" if DEBUG;
$self->channel($channel);
$channel->qos(%{$self->defaults->{qos}})->deliver;
$channel_promise->resolve;
}
);
$self->client->open_channel($channel);
return $channel_promise;
}
);
}
# Start consuming messages
$promise = $promise->then(
sub {
my $consumer_promise = Mojo::Promise->new;
my $consumer = $self->channel->consume(
queue => $self->client->url->query->param('queue'),
%{$self->defaults->{consumer}}
);
$consumer->on(
message => sub {
warn "-- message received\n" if DEBUG;
my ($client, $message) = @_;
$self->emit('message', $message);
}
);
$consumer->on('success' => sub { $consumer_promise->resolve(@_) });
$consumer->deliver;
return $consumer_promise;
}
);
return $promise;
}
sub close {
my $self = shift;
if ($self->client) {
$self->client->close();
}
}
1;
=encoding utf8
=head1 NAME
Mojo::RabbitMQ::Client::Consumer - simple Mojo::RabbitMQ::Client based consumer
=head1 SYNOPSIS
use Mojo::RabbitMQ::Client::Consumer;
my $consumer = Mojo::RabbitMQ::Consumer->new(
url => 'amqp://guest:guest@127.0.0.1:5672/?exchange=mojo&queue=mojo',
defaults => {
qos => {prefetch_count => 1},
queue => {durable => 1},
consumer => {no_ack => 0},
}
);
$consumer->catch(sub { die "Some error caught in Consumer" } );
$consumer->on('success' => sub { say "Consumer ready" });
$consumer->on(
'message' => sub {
my ($consumer, $message) = @_;
$consumer->channel->ack($message)->deliver;
}
);
$consumer->consume_p->wait;
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
=head1 DESCRIPTION
=head1 EVENTS
L<Mojo::RabbitMQ::Client::Consumer> inherits all events from L<Mojo::EventEmitter> and can emit the
following new ones.
=head1 ATTRIBUTES
L<Mojo::RabbitMQ::Client::Consumer> has following attributes.
=head1 METHODS
L<Mojo::RabbitMQ::Client::Consumer> inherits all methods from L<Mojo::EventEmitter> and implements
the following new ones.
=head1 SEE ALSO
L<Mojo::RabbitMQ::Client>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2015-2017, Sebastian Podjasek and others
This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.
=cut
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