RabbitMQ创建死信队列

向Queue_TTL队列里发送消息，10秒后当消息没有被正常消费掉则消息过期被转发至 Queue_DLX死信队列

const amqp = require('amqplib');

async function TTL_production() {
    var conn = await amqp.connect("amqp://localhost:5672");
    var channel = await conn.createChannel();
    var Exchange_TTL = "Exchange_TTL";
    var Queue_TTL = "Queue_TTL";
    var RoutingKey_TTL = "RoutingKey_TTL";
    var Exchange_DLX = 'Exchange_DLX';
    var Queue_DLX = 'Queue_DLX';
    var RoutingKey_DLX = 'RoutingKey_DLX';
    //创建死信队列  这里声明死信队列是为了确保死信队列每次都存在，消息不会丢失
    await channel.assertExchange(Exchange_DLX, 'direct', { autoDelete: true, durable: true });
    await channel.assertQueue(Queue_DLX, {
        exclusive: false,
    });
    await channel.bindQueue(Queue_DLX, Exchange_DLX, RoutingKey_DLX)
    //创建消息队列
    await channel.assertExchange(Exchange_TTL, "direct", { autoDelete: true, durable: true });
    await channel.assertQueue(Queue_TTL, {
        exclusive: false,
        deadLetterExchange: Exchange_DLX,
        deadLetterRoutingKey: RoutingKey_DLX,
    });
    await channel.bindQueue(Queue_TTL, Exchange_TTL, RoutingKey_TTL);
    await channel.publish(Exchange_TTL, RoutingKey_TTL, Buffer.from("发送了一条消息!"), {
        //消息10秒后过期
        expiration: '10000'
    })
    console.log("消息发送成功");
    await channel.close();
    await conn.close();
}

TTL_production();

2. 死信消费者

const amqp = require('amqplib');

async function DLX_comsumer() {
    var conn = await amqp.connect("amqp://localhost:5672");
    var channel = await conn.createChannel();
    var Exchange_DLX = 'Exchange_DLX';
    var Queue_DLX = 'Queue_DLX';
    var RoutingKey_DLX = 'RoutingKey_DLX';
    await channel.assertExchange(Exchange_DLX, 'direct', { autoDelete: true, durable: true });
    await channel.assertQueue(Queue_DLX, {
        exclusive: false,
    });
    await channel.bindQueue(Queue_DLX, Exchange_DLX, RoutingKey_DLX)
    await channel.prefetch(1, false)
    await channel.consume(Queue_DLX, msg => {
        console.log(msg.content.toString())
        channel.ack(msg);
    }, { noAck: false })
    await channel.close();
    await conn.close();
}


DLX_comsumer();

执行生产者向Queue_TTL 发送消息。 

10秒后消息会转发至Queue_DLX