NAME

Mojo::RabbitMQ::Client - Mojo::IOLoop based RabbitMQ client

SYNOPSIS

  use Mojo::RabbitMQ::Client;

  # Supply URL according to (https://www.rabbitmq.com/uri-spec.html)
  my $client = Mojo::RabbitMQ::Client->new(
    url => 'amqp://guest:guest@127.0.0.1:5672/');

  # Catch all client related errors
  $client->catch(sub { warn "Some error caught in client"; });

  # When connection is in Open state, open new channel
  $client->on(
    open => sub {
      my ($client) = @_;

      # Create a new channel with auto-assigned id
      my $channel = Mojo::RabbitMQ::Client::Channel->new();

      $channel->catch(sub { warn "Error on channel received"; });

      $channel->on(
        open => sub {
          my ($channel) = @_;
          $channel->qos(prefetch_count => 1)->deliver;

          # Publish some example message to test_queue
          my $publish = $channel->publish(
            exchange    => 'test',
            routing_key => 'test_queue',
            body        => 'Test message',
            mandatory   => 0,
            immediate   => 0,
            header      => {}
          );
          # Deliver this message to server
          $publish->deliver;

          # Start consuming messages from test_queue
          my $consumer = $channel->consume(queue => 'test_queue');
          $consumer->on(message => sub { say "Got a message" });
          $consumer->deliver;
        }
      );
      $channel->on(close => sub { $log->error('Channel closed') });

      $client->open_channel($channel);
    }
  );

  # Start connection
  $client->connect();

  # Start Mojo::IOLoop if not running already
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

CONSUMER

  use Mojo::RabbitMQ::Client;
  my $consumer = Mojo::RabbitMQ::Client->consumer(
    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->start();

  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

PUBLISHER

  use Mojo::RabbitMQ::Client;
  my $publisher = Mojo::RabbitMQ::Client->publisher(
    url => 'amqp://guest:guest@127.0.0.1:5672/?exchange=mojo&routing_key=mojo'
  );

  $publisher->publish('plain text');

  $publisher->publish(
    {encode => { to => 'json'}},
    routing_key => 'mojo_mq'
  )->then(sub {
    say "Message published";
  })->catch(sub {
    die "Publishing failed"
  })->wait;

DESCRIPTION

Mojo::RabbitMQ::Client is a rewrite of AnyEvent::RabbitMQ to work on top of Mojo::IOLoop.

EVENTS

Mojo::RabbitMQ::Client inherits all events from Mojo::EventEmitter and can emit the following new ones.

connect

  $client->on(connect => sub {
    my ($client, $stream) = @_;
    ...
  });

Emitted when TCP/IP connection with RabbitMQ server is established.

open

  $client->on(open => sub {
    my ($client) = @_;
    ...
  });

Emitted AMQP protocol Connection.Open-Ok method is received.

close

  $client->on(close => sub {
    my ($client) = @_;
    ...
  });

Emitted on reception of Connection.Close-Ok method.

disconnect

  $client->on(close => sub {
    my ($client) = @_;
    ...
  });

Emitted when TCP/IP connection gets disconnected.

ATTRIBUTES

Mojo::RabbitMQ::Client has following attributes.

tls

  my $tls = $client->tls;
  $client = $client->tls(1)

Force secure connection. Default is disabled (0).

user

  my $user = $client->user;
  $client  = $client->user('guest')

Sets username for authorization, by default it's not defined.

pass

  my $pass = $client->pass;
  $client  = $client->pass('secret')

Sets user password for authorization, by default it's not defined.

host

  my $host = $client->host;
  $client  = $client->host('localhost')

Hostname or IP address of RabbitMQ server. Defaults to "localhost".

port

  my $port = $client->port;
  $client  = $client->port(1234)

Port on which RabbitMQ server listens for new connections. Defaults to 5672, which is standard RabbitMQ server listen port.

vhost

  my $vhost = $client->vhost;
  $client  = $client->vhost('/')

RabbitMQ virtual server to user. Default is "/".

params

  my $params = $client->params;
  $client  = $client->params(Mojo::Parameters->new('verify=1'))

Sets additional parameters for connection. Default is not defined.

For list of supported parameters see "SUPPORTED QUERY PARAMETERS".

url

  my $url = $client->url;
  $client = $client->url('amqp://...');

Sets all connection parameters in one string, according to specification from <https://www.rabbitmq.com/uri-spec.html>.

  amqp_URI       = "amqp[s]://" amqp_authority [ "/" vhost ] [ "?" query ]

  amqp_authority = [ amqp_userinfo "@" ] host [ ":" port ]

  amqp_userinfo  = username [ ":" password ]

  username       = *( unreserved / pct-encoded / sub-delims )

  password       = *( unreserved / pct-encoded / sub-delims )

  vhost          = segment

heartbeat_timeout

  my $timeout = $client->heartbeat_timeout;
  $client     = $client->heartbeat_timeout(180);

Heartbeats are use to monitor peer reachability in AMQP. Default value is 60 seconds, if set to 0 no heartbeats will be sent.

connect_timeout

  my $timeout = $client->connect_timeout;
  $client     = $client->connect_timeout(5);

Connection timeout used by Mojo::IOLoop::Client. Defaults to environment variable "MOJO_CONNECT_TIMEOUT" or 10 seconds if nothing else is set.

max_channels

  my $max_channels = $client->max_channels;
  $client          = $client->max_channels(10);

Maximum number of channels allowed to be active. Defaults to 0 which means no implicit limit.

When you try to call "add_channel" over limit an "error" will be emitted on channel saying that: Maximum number of channels reached.

STATIC METHODS

consumer

  my $client = Mojo::RabbitMQ::Client->consumer(...)

Shortcut for creating Mojo::RabbitMQ::Client::Consumer.

publisher

  my $client = Mojo::RabbitMQ::Client->publisher(...)

Shortcut for creating Mojo::RabbitMQ::Client::Publisher.

METHODS

Mojo::RabbitMQ::Client inherits all methods from Mojo::EventEmitter and implements the following new ones.

connect

  $client->connect();

Tries to connect to RabbitMQ server and negotiate AMQP protocol.

close

  $client->close();

param

  my $param = $client->param('name');
  $client   = $client->param(name => 'value');

add_channel

  my $channel = Mojo::RabbitMQ::Client::Channel->new();
  ...
  $channel    = $client->add_channel($channel);
  $channel->open;

open_channel

  my $channel = Mojo::RabbitMQ::Client::Channel->new();
  ...
  $client->open_channel($channel);

delete_channel

  my $removed = $client->delete_channel($channel->id);

SUPPORTED QUERY PARAMETERS

There's no formal specification, nevertheless a list of common parameters recognized by officially supported RabbitMQ clients is maintained here: <https://www.rabbitmq.com/uri-query-parameters.html>.

Some shortcuts are also supported, you'll find them in parenthesis.

Aliases are less significant, so when both are specified only primary value will be used.

cacertfile (ca)

Path to Certificate Authority file for TLS.

certfile (cert)

Path to the client certificate file for TLS.

keyfile (key)

Path to the client certificate private key file for TLS.

fail_if_no_peer_cert (verify)

TLS verification mode, defaults to 0x01 on the client-side if a certificate authority file has been provided, or 0x00 otherwise.

Sets the AMQP authentication mechanism. Defaults to AMQPLAIN. AMQPLAIN and EXTERNAL are supported; EXTERNAL will only work if Mojo::RabbitMQ::Client does not need to do anything beyond passing along a username and password if specified.

heartbeat

Sets requested heartbeat timeout, just like "heartbeat_timeout" attribute.

connection_timeout (timeout)

Sets connection timeout - see connection_timeout attribute.

channel_max

Sets maximum number of channels - see max_channels attribute.

COPYRIGHT AND LICENSE

This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.

Contains AMQP specification (shared/amqp0-9-1.stripped.extended.xml) licensed under BSD-style license.