RabbitMQ
for perl mongers

__
/ ` __
| ` /`/
_/` -"-/` /
| | |
(d b) _/
/
,".|.'._/.'.|.",
/ /' _|_ '/
| / '-`"`-' |
| | | |
| / / |
jgs / / /
`"` : /'"`
`""`""`

AMQP
Advanced Message Queuing Protocol

message flow in
RabbitMQ

RabbitMQ
Exchange
Queue Queue

RabbitMQ RabbitMQ
Queue

RabbitMQ
Queue

AMQP XMPP STOMP HTTP
RabbitMQ
AMQP XMPP STOMP HTTP

AMQP XMPP STOMP HTTP
RabbitMQ AMQP XMPP STOMP HTTP
AMQP XMPP STOMP HTTP RabbitMQ
AMQP XMPP STOMP HTTP

nice pictures but how
does it look like?

Net::AMQP(::Simple)

boilerplate

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 },
};

send a hash

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

receive a message

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

typical messaging flow

the “server”

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 } );
...
}

the “client”

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;
}
}

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)

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

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

AMQP XMPP STOMP HTTP
RabbitMQ
AMQP XMPP STOMP HTTP

how to get started?

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

or ask me
lenz@ideegeo.com
@norbu09

thanks

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

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