primer cambio

node_modules/amqplib/examples/tutorials/rpc_client.js

@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+
+const amqp = require('amqplib');
+const { basename } = require('path');
+const { v4: uuid } = require('uuid');
+
+const queue = 'rpc_queue';
+
+const n = parseInt(process.argv[2], 10);
+if (isNaN(n)) {
+  console.warn('Usage: %s number', basename(process.argv[1]));
+  process.exit(1);
+}
+
+(async () => {
+  let connection;
+  try {
+    connection = await amqp.connect('amqp://localhost');
+    const channel = await connection.createChannel();
+    const correlationId = uuid();
+
+    const requestFib = new Promise(async (resolve) => {
+      const { queue: replyTo } = await channel.assertQueue('', { exclusive: true });
+
+      await channel.consume(replyTo, (message) => {
+        if (!message) console.warn(' [x] Consumer cancelled');
+        else if (message.properties.correlationId === correlationId) {
+          resolve(message.content.toString());
+        }
+      }, { noAck: true });
+
+      await channel.assertQueue(queue, { durable: false });
+      console.log(' [x] Requesting fib(%d)', n);
+      channel.sendToQueue(queue, Buffer.from(n.toString()), { 
+        correlationId,
+        replyTo,
+      });
+    });
+
+    const fibN = await requestFib;
+    console.log(' [.] Got %d', fibN);
+  }
+  catch (err) {
+    console.warn(err);
+  }
+  finally {
+    if (connection) await connection.close();
+  };
+})();