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util.js
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util.js
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const amqp = require('amqplib');
const uuid = require('uuid');
const PRIMARY_EXCHANGE ='primary_exchange';
const PRIMARY_QUEUE ='primary_queue';
const DELAY_EXCHANGE ='delay_exchange';
const DEAD_LETTER_EXCHANGE ='dead_letter_exchange';
const DEAD_LETTER_ROUTING ='dead_letter_routing';
const DEAD_LETTER_QUEUE ='dead_letter_queue';
const DELAY_DEFAULT = 1000;
const RETRY_LIMIT = 3
const DEAD_LETTER_DELAY = 3000;
let connection = null;
const rbmqPool = () => {
if(connection) {
return new Promise(resolve => resolve(connection))
}
return amqp.connect('amqp://localhost').then(conn => {
connection = conn;
console.log('rabbitmq connect success');
return connection;
})
}
const createPrimaryExchangeAndQueue = async (channel) => {
await channel.assertExchange(PRIMARY_EXCHANGE,'direct', {durable: true });
await channel.assertQueue(PRIMARY_QUEUE, {
exclusive: false,
durable: true,
deadLetterExchange: DEAD_LETTER_EXCHANGE,
deadLetterRoutingKey: DEAD_LETTER_ROUTING,
});
await channel.bindQueue(PRIMARY_QUEUE, PRIMARY_EXCHANGE);
}
const createDelayExchange = async (channel) => {
await channel.assertExchange(DELAY_EXCHANGE, "x-delayed-message", {
autoDelete: false,
durable: true,
passive: true, //TODO: Check what it does
arguments: {'x-delayed-type': "direct"}
})
await channel.bindQueue(PRIMARY_QUEUE, DELAY_EXCHANGE);
}
const createDeadLetterExchangeAndQueue = async (channel) => {
await channel.assertExchange(DEAD_LETTER_EXCHANGE,'direct', {durable: true });
await channel.assertQueue(DEAD_LETTER_QUEUE, {
exclusive: false,
durable: true
});
await channel.bindQueue(DEAD_LETTER_QUEUE, DEAD_LETTER_EXCHANGE, DEAD_LETTER_ROUTING);
}
const getDelayRetryInterval = (retryCount, defaultDelay) => {
const interval = Math.pow(2, retryCount - 1) * defaultDelay
console.log(`Next message will be retried after ${interval/1000} sec`)
return interval
}
module.exports = {
rbmqPool,
getDelayRetryInterval,
createPrimaryExchangeAndQueue,
createDelayExchange,
createDeadLetterExchangeAndQueue,
PRIMARY_EXCHANGE,
PRIMARY_QUEUE,
DELAY_EXCHANGE,
DEAD_LETTER_QUEUE,
DEAD_LETTER_DELAY,
DELAY_DEFAULT,
RETRY_LIMIT,
}