I am building a Typescript package around amqplib's Promise API to make it simpler for me to send messages between two RabbitMQ queues.
This is a method inside a class of said package that is responsible for sending a message to RabbitMQ. It's not actually sending messages, because I can't see them from CloudAMQP.
class PostOffice {
connection: any;
constructor(connection: any) {
this.connection = connection;
}
//...
// TMQMessage is an object that can be trivially serialized to JSON
// The Writer class holds the channel because I'm having trouble
// making Typescript class member updates stick after a method returns.
async send(writer: Writer, message: TMQMessage) {
//...RabbitMQ code begins here
let channel = writer.stageConsume[0]; // This channel is created elsewhere
// Queue is created here and I can see it in CloudAMQP.
await channel.assertQueue(message.to + "/stage/1", {
durable: true,
}); // `message.to` is a string indicating destination, e.g. 'test/hello'
// According to docs, the content should be converted to Buffer
await channel.sendToQueue(message.to + "/stage/1", Buffer.from(JSON.stringify(message)));
channel.close()
}
}
This is a class I made that creates connections and channels, which is being used here:
import { Writer } from "./Writer";
export class ConnectionFactory {
url: string;
amqp: any;
constructor(url: string) {
this.url = url;
this.amqp = require('amqplib');
}
async connect(timeout: number = 2000) {
let connection = await this.amqp.connect(this.url, {
// timeout for a message acknowledge.
timeout, // Make the timeout 2s per now
})
return connection;
}
async createChannels(connection: any, writer: Writer) {
//... relevant code starts here
let stageChannels = [];
stageChannels.push(await connection.createChannel())
writer.stageConsume = stageChannels;
return writer;
}
}
}
My connection factory seems to be working properly, because I can see the connections from CloudAMQP's dashboard. Also I can see the Queues that have been created (asserted in my code) from the dashboard too. However, I am unable to get amqplib to send a message out to CloudAMQP.
Here's the (async) code I'm using to call my package:
let Cf = new ConnectionFactory(url)
let connection = await Cf.connect()
let writer = new Writer();
let message: TMQMessage = {
//... message content in JSON
}
writer = await Cf.createChannels(connection, writer)
let po = new PostOffice(connection)
await po.send(writer, message)
What seems to be wrong?
