Rabbit MQ amqplib 错误“没有剩余通道可分配”

Question

在 pub sub 模式中使用 rabbit mq 工人一段时间后，我在创建频道时遇到错误。

Error: No channels left to allocate

Answer 1

The maximum number of channels you can allocate is negotiated with rabbitmp server. In my server, this value is 2047. You can debug you amqplib/lib/connection.js to get this.

Answer 2

If you are using https://www.npmjs.com/package/amqplib , you can use Promise to share a channel while publishing multiple messages

in message-queue.js

const q = 'tasks';

const open = require('amqplib').connect('amqp://localhost');

const channelPromise = open.then((conn) => conn.createChannel());

// Publisher
function publishMessage(message) {
  channelPromise.then((ch) => ch.assertQueue(q)
    .then((ok) => ch.sendToQueue(q, Buffer.from(message))))
    .catch(console.warn);
}

// Consumer
open.then((conn) => conn.createChannel())
  .then((ch) => ch.assertQueue(q).then((ok) => ch.consume(q, (msg) => {
    if (msg !== null) {
      console.log(msg.content.toString());
      ch.ack(msg);
    }
  }))).catch(console.warn);

module.exports = {
  publishMessage,
};

some-where.js

messageQueue.publishMessage('hello world')