├── .gitignore ├── README.md ├── package-lock.json ├── package.json ├── processor-service └── processor-service.js ├── rabbit_mq_setup.js └── web-service └── web-service.js /.gitignore: -------------------------------------------------------------------------------- 1 | .idea 2 | .vscode 3 | node_modules 4 | 5 | .env -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Asynchronous Microservices with RabbitMQ and Node.js 2 | 3 | ## Setup 4 | After Provisioning RabbitMQ, run 5 | ```` 6 | npm install 7 | node rabbit_mq_setup.js 8 | cd web-service 9 | node web-service.js 10 | // in a different terminal 11 | cd processor-service 12 | node processor-service.js 13 | ```` 14 | 15 | In a third terminal, send a request to test the processing: 16 | ```` 17 | curl --header "Content-Type: application/json" \ 18 | --request POST \ 19 | --data '{"data":"my-data"}' \ 20 | http://localhost:3000/api/v1/processData 21 | ```` 22 | 23 | You should see the results in the web service terminal after a few seconds: 24 | ```` 25 | Results saved 26 | requestId: x , resultsData: my-data-processed 27 | 28 | ```` 29 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "async-microservices-demo", 3 | "requires": true, 4 | "lockfileVersion": 1, 5 | "dependencies": { 6 | "accepts": { 7 | "version": "1.3.5", 8 | "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz", 9 | "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=", 10 | "requires": { 11 | "mime-types": "~2.1.18", 12 | "negotiator": "0.6.1" 13 | } 14 | }, 15 | "amqplib": { 16 | "version": "0.5.3", 17 | "resolved": "https://registry.npmjs.org/amqplib/-/amqplib-0.5.3.tgz", 18 | "integrity": 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process.env.CLOUDAMQP_URL; 8 | 9 | async function listenForMessages() { 10 | // connect to Rabbit MQ 11 | let connection = await amqp.connect(messageQueueConnectionString); 12 | 13 | // create a channel and prefetch 1 message at a time 14 | let channel = await connection.createChannel(); 15 | await channel.prefetch(1); 16 | 17 | // create a second channel to send back the results 18 | let resultsChannel = await connection.createConfirmChannel(); 19 | 20 | // start consuming messages 21 | await consume({ connection, channel, resultsChannel }); 22 | } 23 | 24 | // utility function to publish messages to a channel 25 | function publishToChannel(channel, { routingKey, exchangeName, data }) { 26 | return new Promise((resolve, reject) => { 27 | channel.publish(exchangeName, routingKey, Buffer.from(JSON.stringify(data), 'utf-8'), { persistent: true }, function (err, ok) { 28 | if (err) { 29 | return reject(err); 30 | } 31 | 32 | resolve(); 33 | }) 34 | }); 35 | } 36 | 37 | // consume messages from RabbitMQ 38 | function consume({ connection, channel, resultsChannel }) { 39 | return new Promise((resolve, reject) => { 40 | channel.consume("processing.requests", async function (msg) { 41 | // parse message 42 | let msgBody = msg.content.toString(); 43 | let data = JSON.parse(msgBody); 44 | let requestId = data.requestId; 45 | let requestData = data.requestData; 46 | console.log("Received a request message, requestId:", requestId); 47 | 48 | // process data 49 | let processingResults = await processMessage(requestData); 50 | 51 | // publish results to channel 52 | await publishToChannel(resultsChannel, { 53 | exchangeName: "processing", 54 | routingKey: "result", 55 | data: { requestId, processingResults } 56 | }); 57 | console.log("Published results for requestId:", requestId); 58 | 59 | // acknowledge message as processed successfully 60 | await channel.ack(msg); 61 | }); 62 | 63 | // handle connection closed 64 | connection.on("close", (err) => { 65 | return reject(err); 66 | }); 67 | 68 | // handle errors 69 | connection.on("error", (err) => { 70 | return reject(err); 71 | }); 72 | }); 73 | } 74 | 75 | // simulate data processing that takes 5 seconds 76 | function processMessage(requestData) { 77 | return new Promise((resolve, reject) => { 78 | setTimeout(() => { 79 | resolve(requestData + "-processed") 80 | }, 5000); 81 | }); 82 | } 83 | 84 | listenForMessages(); -------------------------------------------------------------------------------- /rabbit_mq_setup.js: -------------------------------------------------------------------------------- 1 | require('dotenv').config(); 2 | 3 | const amqp = require('amqplib'); 4 | 5 | // RabbitMQ connection string 6 | const messageQueueConnectionString = process.env.CLOUDAMQP_URL; 7 | 8 | async function setup() { 9 | console.log("Setting up RabbitMQ Exchanges/Queues"); 10 | // connect to RabbitMQ Instance 11 | let connection = await amqp.connect(messageQueueConnectionString); 12 | 13 | // create a channel 14 | let channel = await connection.createChannel(); 15 | 16 | // create exchange 17 | await channel.assertExchange("processing", "direct", { durable: true }); 18 | 19 | // create queues 20 | await channel.assertQueue("processing.requests", { durable: true }); 21 | await channel.assertQueue("processing.results", { durable: true }); 22 | 23 | // bind queues 24 | await channel.bindQueue("processing.requests","processing", "request"); 25 | await channel.bindQueue("processing.results","processing", "result"); 26 | 27 | console.log("Setup DONE"); 28 | process.exit(); 29 | } 30 | 31 | setup(); -------------------------------------------------------------------------------- /web-service/web-service.js: -------------------------------------------------------------------------------- 1 | const path = require('path'); 2 | require('dotenv').config({path: path.resolve(process.cwd(), '../.env')}); 3 | 4 | const express = require('express'); 5 | const app = express(); 6 | const http = require('http'); 7 | const bodyParser = require('body-parser'); 8 | const amqp = require('amqplib'); 9 | 10 | // Middleware 11 | app.use(bodyParser.json()); 12 | 13 | // simulate request ids 14 | let lastRequestId = 1; 15 | 16 | // RabbitMQ connection string 17 | const messageQueueConnectionString = process.env.CLOUDAMQP_URL; 18 | 19 | // handle the request 20 | app.post('/api/v1/processData', async function (req, res) { 21 | // save request id and increment 22 | let requestId = lastRequestId; 23 | lastRequestId++; 24 | 25 | // connect to Rabbit MQ and create a channel 26 | let connection = await amqp.connect(messageQueueConnectionString); 27 | let channel = await connection.createConfirmChannel(); 28 | 29 | // publish the data to Rabbit MQ 30 | let requestData = req.body.data; 31 | console.log("Published a request message, requestId:", requestId); 32 | await publishToChannel(channel, { routingKey: "request", exchangeName: "processing", data: { requestId, requestData } }); 33 | 34 | // send the request id in the response 35 | res.send({ requestId }) 36 | }); 37 | 38 | // utility function to publish messages to a channel 39 | function publishToChannel(channel, { routingKey, exchangeName, data }) { 40 | return new Promise((resolve, reject) => { 41 | channel.publish(exchangeName, routingKey, Buffer.from(JSON.stringify(data), 'utf-8'), { persistent: true }, function (err, ok) { 42 | if (err) { 43 | return reject(err); 44 | } 45 | 46 | resolve(); 47 | }) 48 | }); 49 | } 50 | 51 | 52 | async function listenForResults() { 53 | // connect to Rabbit MQ 54 | let connection = await amqp.connect(messageQueueConnectionString); 55 | 56 | // create a channel and prefetch 1 message at a time 57 | let channel = await connection.createChannel(); 58 | await channel.prefetch(1); 59 | 60 | // start consuming messages 61 | await consume({ connection, channel }); 62 | } 63 | 64 | 65 | // consume messages from RabbitMQ 66 | function consume({ connection, channel, resultsChannel }) { 67 | return new Promise((resolve, reject) => { 68 | channel.consume("processing.results", async function (msg) { 69 | // parse message 70 | let msgBody = msg.content.toString(); 71 | let data = JSON.parse(msgBody); 72 | let requestId = data.requestId; 73 | let processingResults = data.processingResults; 74 | console.log("Received a result message, requestId:", requestId, "processingResults:", processingResults); 75 | 76 | // acknowledge message as received 77 | await channel.ack(msg); 78 | }); 79 | 80 | // handle connection closed 81 | connection.on("close", (err) => { 82 | return reject(err); 83 | }); 84 | 85 | // handle errors 86 | connection.on("error", (err) => { 87 | return reject(err); 88 | }); 89 | }); 90 | } 91 | 92 | // Start the server 93 | const PORT = 3000; 94 | server = http.createServer(app); 95 | server.listen(PORT, "localhost", function (err) { 96 | if (err) { 97 | console.error(err); 98 | } else { 99 | console.info("Listening on port %s.", PORT); 100 | } 101 | }); 102 | 103 | // listen for results on RabbitMQ 104 | listenForResults(); --------------------------------------------------------------------------------