50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
#!/usr/bin/env node
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const amqp = require('amqplib');
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const { basename } = require('path');
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const { v4: uuid } = require('uuid');
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const queue = 'rpc_queue';
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const n = parseInt(process.argv[2], 10);
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if (isNaN(n)) {
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console.warn('Usage: %s number', basename(process.argv[1]));
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process.exit(1);
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}
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(async () => {
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let connection;
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try {
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connection = await amqp.connect('amqp://localhost');
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const channel = await connection.createChannel();
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const correlationId = uuid();
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const requestFib = new Promise(async (resolve) => {
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const { queue: replyTo } = await channel.assertQueue('', { exclusive: true });
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await channel.consume(replyTo, (message) => {
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if (!message) console.warn(' [x] Consumer cancelled');
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else if (message.properties.correlationId === correlationId) {
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resolve(message.content.toString());
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}
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}, { noAck: true });
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await channel.assertQueue(queue, { durable: false });
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console.log(' [x] Requesting fib(%d)', n);
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channel.sendToQueue(queue, Buffer.from(n.toString()), {
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correlationId,
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replyTo,
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});
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});
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const fibN = await requestFib;
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console.log(' [.] Got %d', fibN);
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}
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catch (err) {
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console.warn(err);
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}
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finally {
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if (connection) await connection.close();
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};
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})();
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