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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| const EventEmitter = require('events'); | ||
| const amqp = require('amqplib'); | ||
|
|
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| const RABBITMQ_HOST = process.env.RABBITMQ_HOST || 'localhost'; | ||
| const RABBITMQ_PORT = process.env.RABBITMQ_PORT || 5672; | ||
| const RABBITMQ_USER = process.env.RABBITMQ_USER || 'devuser'; | ||
| const RABBITMQ_PASS = process.env.RABBITMQ_PASS || 'devpass'; | ||
| const RABBITMQ_VHOST = process.env.RABBITMQ_VHOST || '/'; | ||
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|
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| /** | ||
| * A BrokkerConnector for RabbitMQ | ||
| * | ||
| * {@see BrokerConnector} | ||
| */ | ||
| class RabbitConnector extends EventEmitter { | ||
| constructor() { | ||
| super(); | ||
| this.conn = null; | ||
| this.onClose = this.onClose.bind(this); | ||
| this.onError = this.onError.bind(this); | ||
| } | ||
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|
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| get connection() { | ||
| return this.conn ? Promise.resolve(this.conn) : this.connect(); | ||
| } | ||
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| async connect() { | ||
| const conn = await amqp.connect({ | ||
| protocol: 'amqp', | ||
| hostname: RABBITMQ_HOST, | ||
| port: Number(RABBITMQ_PORT), | ||
| username: RABBITMQ_USER, | ||
| password: RABBITMQ_PASS, | ||
| vhost: RABBITMQ_VHOST | ||
| }); | ||
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| conn.on('error', this.onError); | ||
| conn.on('close', this.onClose); | ||
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| this.conn = conn; | ||
| this.emit('connect', conn); | ||
|
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| return conn; | ||
| } | ||
|
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| disconnect() { | ||
| return new Promise(resolve => { | ||
| if (!this.conn) { | ||
| resolve(); | ||
| } | ||
| this.conn.off('close', this.onClose); | ||
| this.conn.close().then(() => { | ||
| this.emit('close', this.conn); | ||
| this.conn = null; | ||
| resolve(); | ||
| }); | ||
| }); | ||
| } | ||
|
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| reconnect() { | ||
| this.emit('reconnect'); | ||
| setTimeout(() => this.connect(), 500); | ||
| } | ||
|
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| onClose() { | ||
| this.emit('close', this.conn); | ||
| this.conn = null; | ||
| this.reconnect(); | ||
| } | ||
|
|
||
| onError(err) { | ||
| this.emit('error', err); | ||
| this.conn = null; | ||
| if (err.message !== 'Connection closing') { | ||
| this.reconnect(); | ||
| } | ||
| } | ||
| } | ||
|
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| module.exports = new RabbitConnector(); | ||
|
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| /** | ||
| * A BrokerConnector provides a persistent connection | ||
| * to a message broker with reconnect on failure guarantees. | ||
| * | ||
| * @typedef {Object} BrokerConnector | ||
| * @property {Promise<object>} connection - the connection as an object, will connect first if not already connected | ||
| * @property {function():Promise<object>} connect - create a new connection | ||
| */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* eslint-disable global-require */ | ||
| import logger from 'logger'; | ||
| import CreateOrderCommand from 'domain/orders/create/command'; | ||
|
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| const inputQueue = 'hexagonal.input'; | ||
|
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| class Broker { | ||
| constructor(rabbit, commandBus) { | ||
| this.rabbit = rabbit; | ||
| this.commandBus = commandBus; | ||
| } | ||
|
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| async start() { | ||
| this.conn = await this.rabbit.connection; | ||
| this.channel = await this.conn.createChannel(); | ||
| this.channel.assertQueue(inputQueue, {durable: true}); | ||
| this.channel.consume(inputQueue, this.consumeMessage.bind(this)); | ||
| } | ||
|
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| async consumeMessage(msg) { | ||
| let response; | ||
| let command; | ||
|
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| try { | ||
| const payload = JSON.parse(msg.content.toString()); | ||
| const {commandType, commandBody} = payload; | ||
| switch (commandType) { | ||
| case 'CreateOrder': | ||
| command = CreateOrderCommand.buildFromJSON(commandBody); | ||
| break; | ||
| default: | ||
| throw new Error('Unknown commandType'); | ||
| } | ||
| response = this.commandBus.execute(command); | ||
| } catch (error) { | ||
| logger.error(error.message); | ||
| response = error.message; | ||
| this.channel.nack(msg); | ||
| return; | ||
| } | ||
|
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| if (msg.properties.replyTo) { | ||
| const replyOpts = { | ||
| correlationId: msg.properties.correlationId | ||
| }; | ||
| this.channel.sendToQueue( | ||
| msg.properties.replyTo, | ||
| Buffer.from(JSON.stringify(response)), | ||
| replyOpts | ||
| ); | ||
| } | ||
|
|
||
| this.channel.ack(msg); | ||
| } | ||
| } | ||
|
|
||
| module.exports = Broker; |
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