Passing Curiosity: Posts tagged messaging https://passingcuriosity.com/tags/messaging/messaging.xml Thomas Sutton me@thomas-sutton.id.au 2012-08-19T00:00:00Z PyconAU 2012: Message queueing https://passingcuriosity.com/2012/message-queueing/ 2012-08-19T00:00:00Z 2012-08-19T00:00:00Z PyMQ

LOLWUT?

ZeroMQ

Basically a socket; no broker; no persistence.

RabbitMQ

Complete implementation of AMQP, plus extra stuff too. Each exchange is a separate process in RabbitMQ.

AMQP

AMQP is a standard protocol for message queueing. Producers, brokers, consumers; exchanges and queues.

Exchanges

Three types of exchanges:

  1. Direct exchanges transmit a message with a matching routing key into the queue it is bound to.

  2. Topic exchanges transmit messages with a routing key which matches a pattern into the queue it is bound to.

  3. Fanout exchanges transmit a message to all queues it is bound to.

Mark exchange durable. Mark queues durable. Both need to be durable to connect to each other. Also: clients need to ask for durable.

Message persistence: set “deliverymode=2” on the message.

Architecture

Have queues on both sides of the cloud, so if the tubes get clogged messages are stored on either side.

RabbitMQ has a server plugin called Shovel which will forward the messages in a queue to a queue on another RabbitMQ server. This works around the fact that you can’t connect a queue to a queue.

Configuring it is basically writing an Erlang program.

Web Interface

Default credentials: guest / guest

Python

Piku

Kombu

http://www.tcpcatcher.fr

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