A talk I held at perl mongers Wellington about RabbitMQ and Net::AMQP. A brief introduction to RabbitMQ and some basic code samples on how to use it from perl.

1. RabbitMQ
for perl mongers

2. __
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3. AMQP
Advanced Message Queuing Protocol

4. message flow in
RabbitMQ

5. RabbitMQ
Exchange
Queue Queue

6. RabbitMQ RabbitMQ
Queue

7. RabbitMQ
Queue

8. AMQP XMPP STOMP HTTP
RabbitMQ
AMQP XMPP STOMP HTTP

9. AMQP XMPP STOMP HTTP
RabbitMQ AMQP XMPP STOMP HTTP
AMQP XMPP STOMP HTTP RabbitMQ
AMQP XMPP STOMP HTTP

11. nice pictures but how
does it look like?

12. Net::AMQP(::Simple)

13. boilerplate

14. my $spec = {
RemoteAddress => '127.0.0.1',
RemotePort => { default => 5672 },
Username => { default => 'guest' },
Password => { default => 'guest' },
VirtualHost => { default => '/' },
Logger => 0,
Debug => { default => {} },
Alias => { default => 'amqp_client' },
AliasTCP => { default => 'tcp_client' },
Callbacks => { default => {} },
channels => { default => {} },
is_started => { default => 0 },
};

15. send a hash

16. # conect to the server
Net::AMQP::Simple::connect($spec);
# push the message
Net::AMQP::Simple::pub( $queue, to_json($hash) );

17. receive a message

18. while ( !$done ) {
check( Net::AMQP::Simple::poll() );
}
sub check {
foreach my $_req (@_) {
my $req = from_json($_req);
print Dumper($req);
$done = 1;
}
}

19. typical messaging flow

20. the “server”

21. Net::AMQP::Simple::connect($spec);
Net::AMQP::Simple::queue("web.domaindb.up");
while (1) {
process( Net::AMQP::Simple::poll() );
}
sub process {
foreach my $_req (@_) {
my $req = from_json( $_req,
{ allow_nonref => 1 } );
...
}

22. the “client”

23. Net::AMQP::Simple::connect($spec);
Net::AMQP::Simple::pub( $queue, to_json($hash) );
Net::AMQP::Simple::queue( $uuid, 'autodelete' );
while ( !$done ) {
check( Net::AMQP::Simple::poll() );
}
sub check {
foreach my $_req (@_) {
my $req = from_json($_req);
print Dumper($req);
$done = 1;
}
}

25. in plain english
• start a service that listens on a queue
• push a message to the service and tell the
service how to reply (if needed)
• listen on a temp queue for the response (if
needed)

26. how to reply?
• use AMQP header fields
• roll your own protocol (JSON, XML, ...)

27. ... roll your own
if you want to use the full power of RabbitMQ

28. AMQP XMPP STOMP HTTP
RabbitMQ
AMQP XMPP STOMP HTTP

29. how to get started?

30. • http://rabbitmq.com (get rabbit here)
• http://github.com/norbu09/
• net_amqp (has the Simple.pm)
• RabbitIntro (some samples)
• Net_RabbitMQ_HTTP

31. or ask me
lenz@ideegeo.com
@norbu09

32. thanks

33. credits
• the RabbitMQ guys for an awesome
product
• iWantMyName for letting me play with all
that stuff
• many guys on the mailing list for helping me
out when i got stuck
• Catalyst IT for the beers

34. more credits
• http://www.ascii-art.com
• http://www.flickr.com/photos/revengingangel/
• http://www.flickr.com/photos/jeff62138/