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# 🐇 Elixir RabbitMQ Client
`rabbit_mq` is an opinionated RabbitMQ client to help _you_ build balanced and consistent Consumers and Producers.
## Table of contents
- [Installation and Usage](#installation-and-usage)
- [Documentation](#documentation)
- [Balanced performance and reliability](#balanced-performance-and-reliability)
- [Consistency](#consistency)
- [TODO](#todo)
## Installation and Usage
The easiest way to add `rabbit_mq` to your project is by using Mix.
Add `:rabbit_mq` as a dependency to your project's `mix.exs`:
```elixir
defp deps do
[
{:rabbit_mq, "~> 1.0"}
]
end
```
## Documentation
The full documentation is [published on hex](https://hexdocs.pm/rabbit_mq/).
The following modules are provided;
- [`RabbitMQ.Topology`](https://hexdocs.pm/rabbit_mq/RabbitMQ.Topology.html)
- [`RabbitMQ.Consumer`](https://hexdocs.pm/rabbit_mq/RabbitMQ.Consumer.html)
- [`RabbitMQ.Producer`](https://hexdocs.pm/rabbit_mq/RabbitMQ.Producer.html)
## Balanced performance and reliability
The RabbitMQ modules are pre-configured with sensible defaults and follow design principles that improve and delicately balance both performance _and_ reliability.
This has been possible through
- a) extensive experience of working with Elixir and RabbitMQ in production; _and_
- b) meticulous consultation of the below (and more) documents and guides.
⚠️ While most of the heavy-lifting is provided by the library itself, reading through the documents below before running _any_ application in production is thoroughly recommended.
- [Connections](https://www.rabbitmq.com/connections.html)
- [Channels](https://www.rabbitmq.com/channels.html)
- [Reliability Guide](https://www.rabbitmq.com/reliability.html)
- [Publisher Confirms](https://www.rabbitmq.com/confirms.html#publisher-confirms)
- [Consumer Acknowledgements and Publisher Confirms](https://www.rabbitmq.com/confirms.html)
- [Consumer Acknowledgement Modes and Data Safety Considerations](https://www.rabbitmq.com/confirms.html#acknowledgement-modes)
- [Consumer Prefetch](https://www.rabbitmq.com/consumer-prefetch.html)
- [Production Checklist](https://www.rabbitmq.com/production-checklist.html)
- [RabbitMQ Best Practices](https://www.cloudamqp.com/blog/2017-12-29-part1-rabbitmq-best-practice.html)
- [RabbitMQ Best Practice for High Performance (High Throughput)](https://www.cloudamqp.com/blog/2018-01-08-part2-rabbitmq-best-practice-for-high-performance.html)
## Consistency
The RabbitMQ modules are designed to help you build consistent, SDK-like Consumers and Producers.
```elixir
defmodule CustomerProducer do
use RabbitMQ.Producer, exchange: "customer"
@doc """
Publishes an event routed via "customer.created".
"""
def customer_created(customer_id) do
opts = [
content_type: "application/json",
correlation_id: UUID.uuid4(),
mandatory: true
]
payload = Jason.encode!(%{version: "1.0.0", customer_id: customer_id})
publish(payload, "customer.created", opts)
end
@doc """
Publishes an event routed via "customer.created".
"""
def customer_updated(customer_data) do
opts = [
content_type: "application/json",
correlation_id: UUID.uuid4(),
mandatory: true
]
payload = Jason.encode!(%{version: "1.0.0", customer_data: customer_data})
publish(payload, "customer.created", opts)
end
end
```
## TODO
A quick and dirty tech-debt tracker, used in conjunction with Issues.
- [ ] Add support for notifying the parent producer when a publisher `nack` occurs.
