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RABBITMQ Message queuing that works

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Gabriele Santomaggio

gabriele.santomaggio@erlang-solutions.comwww.erlang-solutions.com

▸ Working at Erlang Solutions▸ RabbitMQ contributor▸ Co-author of RabbitMQ Cookbook▸ @gsantomaggio

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What is RabbitMQ ?

▸ Multi-protocol Messaging broker ▸ Written in Erlang

Producer

Consumer

Exchange

Queue

Server

Virtual host

Binding

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Protocols

▸ AMQP 0-9-1▸ MQTT ▸ STOMP ▸ AMQP 1.0 ▸ HTTP

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RabbitMQ CLIENTS

▸ Java▸ .NET/C# Client▸ Python▸ PHP▸ Erlang▸ Node.js▸ iPhone (Dev in progress)▸ Others…

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1. Create team ("my_company")

2. Create different rooms ("tech.programming", "tech.networking","marketing")

3. Send message to the room4. Send private messages5. Store messages6. Clustering / HA

Messaging - example

GOALS

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What we need

my_company

App. client 1

App. client 2

Db - service 1

App 1

App 2

Db - service 2Exchange

Persistent Queue

Temporary Queues

Db - service n

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R1: Create team

exchange_declare(exchange="my_company", exchange_type="topic")

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R2: Room subscribe

queue_declare(exclusive=True, auto_delete=True)

queue_bind(exchange="my_company", queue=queue,

routing_key="tech.programming")

basic_consume(on_message, queue=queue, no_ack=True)

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headers = { 'sender_user':my_user_name, 'sent': datetime.datetime.now(), 'is_private': False}properties = pika.BasicProperties( headers=headers)

channel.publish(exchange="my_company", routing_key="tech.programming" properties=properties, body="I love Erlang!")

R3: Send message to the room

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headers = { 'sender_user':my_user_name, 'sent': datetime.datetime.now(), 'is_private': True}properties = pika.BasicProperties( headers=headers)

channel.publish(exchange="my_company", routing_key="gabriele",

properties=properties, body="how are you? :)!")

R4: Send private message

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R5: Store messages

channel.queueDeclare("store.messages", true, false, false, null);

channel.queueBind("store.messages", "my_company", "#");

channel.basicQos(1);// round robin channel.basicConsume("store.messages", new DefaultConsumer()...

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Oh no… seems so complex!!

R6: Distributed RabbitMQ

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▸ rabbitmqctl stop_app▸ rabbitmqctl reset▸ rabbitmqctl join_cluster rabbit@server

▸ rabbitmqctl start_app

Clustering!

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High Availability

Healthy Cluster

One Node Down

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R6: Done!

We finished the app

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What about WAN configuration?

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Federation/Shovel - Plugin

▸ Loose coupling ▸ WAN-friendly ▸ Tolerant to network failures

Node 1 Node 2AMQP client

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Cloud scaling...

Db - Service Db - Service Db - Service

store.messages - HA

Client 1 Client 2 Client..n

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Exchange messages

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Store Messages

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Full example

▸ Full description(soon...I hope:)) https://www.erlang-solutions.com/blog.html

▸ Source code (other languages)https://github.com/Gsantomaggio/rabbitmqexample

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THANK YOU!

Any questions?

gabriele.santomaggio@erlang-solutions.comwww.erlang-solutions.com @gsantomaggio