adonis-queuemq v0.0.6

adonis-rabbitmq

@emmadedayo/adonis-rabbitmq is a RabbitMQ provider for Adonis.

Getting Started

Instal @emmadedayo/adonis-rabbitmq:

yarn add @emmadedayo/adonis-rabbitmq

Then:

node ace invoke @emmadedayo/adonis-rabbitmq

This will create config/rabbit.ts and add the following fields to your .env:

RABBIT_CONNECTION= amqp://localhost

Make sure to set the correct values to the enviroment variables so @emmadedayo/adonis-rabbitmq can connect.

Basic Usage

Sending messages to an queue

import Rabbit from '@ioc:Adonis/Addons/Rabbit'
import Route from '@ioc:Adonis/Core/Route'

Route.get('/', async () => {
  // Ensures the queue exists
  await Rabbit.assertQueue('my_queue')

  // Sends a message to the queue
  await Rabbit.sendToQueue('my_queue', 'This message was sent by @emmadedayo/adonis-rabbitmq')
})

Subscribing

Notice doesn't really makes sense to subscribe to an queue inside a controller, usually this is done through a preload file.

Creating a preload file

1. In the CLI, type: node ace make:prldfile rabbit
2. Select ( ) During HTTP server

This is will create start/rabbit.ts.

Listening to an queue

Inside start/rabbit.ts:

import Rabbit from '@ioc:Adonis/Addons/Rabbit'

async function listen() {
  await Rabbit.assertQueue('my_queue')

  await Rabbit.consumeFrom('my_queue', (message) => {
    console.log(message.content)
  })
}

listen()

This will log every message sent to my queue my_queue.

Documentation

RabbitMQ Manager

Import

import Rabbit from '@ioc:Adonis/Addons/Rabbit'

assertQueue()

await Rabbit.assertQueue('myQueue')

Assert the queue is created.

Parameters:

1. queueName: the name of the queue
2. options?: the queue options

assertExchange()

await Rabbit.assertExchange('myQueue', 'type')

Assert the exchange is created.

Parameters:

1. queueName: the name of the queue
2. type: the type of the exchange
3. options?: the queue options

bindQueue()

await Rabbit.bindQueue('myQueue', 'myExchange', '')

Binds a queue and an exchange .

1. queueName: the name of the queue
2. exchangeName: the name of the exchange
3. pattern?: the pattern (default to '')

sendToQueue()

await Rabbit.sendToQueue('myQueue', 'content')

Parameters:

1. queueName: the name of the queue
2. content: the content to be send to the queue
3. options: the options

Notice that the content parameter don't need to be a Buffer, Adonis RabbitMQ will automatically convert it to a Buffer if it isn't already.

You also don't have to JSON.stringify an object, Adonis RabbitMQ will also do that for you (it'll be transformed to JSON then to Buffer).

sendToExchange()

await Rabbit.sendToExchange('myExchange', 'myRoutingKey', 'content')

Parameters:

1. exchangeName: the name of the exchange
2. routingKey: the routing key
3. content: the content to send to the exchange
4. options: the options

Notice that the content parameter doesn't need to be a Buffer, Adonis RabbitMQ will automatically convert it to a Buffer if it is'nt already.

You also don't have to JSON.stringify an object, Adonis RabbitMQ will also do that for you (it'll be transformed to JSON then to Buffer).

consumeFrom()

await Rabbit.consumeFrom('myQueue', (message) => {
  console.log(message.content)
  message.ack()
})

Consumes a message from a queue.

1. queueName: the name of the queue
2. onMessage the callback which will be executed on the message receive.

The onMessage callback receives a Message instance as parameter.

await ackAll()

await Rabbit.ackAll()

Acknowledges all the messages.

await nackAll()

await Rabbit.nackAll()

Rejects all the messages.

Parameters:

1. requeue? adds the rejected messages to queue again.

getConnection()

Retrieves the amqplib's Connection instance. If there`s not a connection, it'll be created.

await Rabbit.getConnection()

getConnection()

Retrieves the amqplib's Connection instance. If there`s not a connection, it'll be created.

await Rabbit.getConnection()

getChannel()

Retrieves the amqplib's Channel instance. If there's not a connection, it'll be created. If there`s not a channel, it'll be created too.

await Rabbit.getChannel()

closeChannel()

Closes the channel.

closeConnection()

Closes the connection.

Message

When consuming messages through consumeFrom, you'll receive in the callback a Message instance.

This slightly different from amqplib approach. For example:

Rabbit.consumeFrom('queue', (message) => {
  // Acknowledges the message
  message.ack()

  // Rejects the message
  message.reject()

  // The message content
  console.log(message.content)

  // If you're expecting a JSON, this will return the parsed message
  console.log(message.jsonContent)
})

content

message.content

Returns the message content.

jsonContent

message.jsonContent

If the message is expected to be in JSON format, then you can use message.jsonContent to get the message parsed as an object.

fields

message.fields

The message fields.

properties

message.properties

The message properties.

ack()

message.ack()

Acknowledges the message.

1. allUpTo? acknowledges all the messages up to this.

nack()

message.nack()

Rejects the message.

Parameters:

1. allUpTo? rejects all the messages up to this.
2. requeue? adds the rejected messages to Queue again.

reject()

message.nack()

Rejects the message, equivalent to nack, but works in older versions of RabbitMQ where nack does not.

Parameters:

1. requeue? adds the rejected messages to Queue again.

Roadmap

• Tests

adonis-rabbitmq