primer cambio

node_modules/amqplib/examples/tutorials/rpc_server.js

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+const amqp = require('amqplib');
+
+const queue = 'rpc_queue';
+
+(async () => {
+  try {
+    const connection = await amqp.connect('amqp://localhost');
+    const channel = await connection.createChannel();
+
+    process.once('SIGINT', async () => { 
+      await channel.close();
+      await connection.close();
+    });
+
+    await channel.assertQueue(queue, { durable: false });
+
+    channel.prefetch(1);
+    await channel.consume(queue, (message) => {
+      const n = parseInt(message.content.toString(), 10);
+      console.log(' [.] fib(%d)', n);
+      const response = fib(n);
+      channel.sendToQueue(message.properties.replyTo, Buffer.from(response.toString()), {
+        correlationId: message.properties.correlationId
+      });
+      channel.ack(message);
+    });
+
+    console.log(' [x] Awaiting RPC requests. To exit press CTRL+C.');
+  }
+  catch (err) {
+    console.warn(err);
+  }
+})();
+
+function fib(n) {
+  // Do it the ridiculous, but not most ridiculous, way. For better,
+  // see http://nayuki.eigenstate.org/page/fast-fibonacci-algorithms
+  let a = 0, b = 1;
+  for (let i=0; i < n; i++) {
+    let c = a + b;
+    a = b; b = c;
+  }
+  return a;
+}