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![1 const express = require('express');
2 const bodyParser = require('body-parser');
3
4 const app = express();
5 app.use(bodyParser.json());
6
7 app.listen(3000, () => {
8 console.log(' [x] Awaiting for requests');
9 });
10
11 app.get('/:id', (request, response) => {
12 const id = request.params.id;
13
14 console.log(` [.] ID ${id}`);
15
16 response.status(200).json({
17 data: {
18 name: 'Ada Lovelace',
19 occupation: 'Programmer'
20 }
21 });
22 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-46-320.jpg)
![1 app.listen(3000, () => {
2 console.log(' [x] Awaiting for requests');
3 });
4
5 app.get('/:id', (request, response) => {
6 const id = request.params.id;
7
8 console.log(` [.] ID ${id}`);
9
10 response.status(200).json({
11 data: {
12 name: 'Ada Lovelace',
13 occupation: 'Programmer'
14 }
15 });
16 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-47-320.jpg)
![1 const express = require('express');
2 const request = require('request-promise');
3
4 const id = process.argv.slice(2);
5
6 const app = express();
7
8 app.listen(3005, () => {
9 console.log(` [x] Requesting user ${id}`);
10
11 request(`http://localhost:3000/${id}`)
12 .then((res) => {
13 return console.log(` [.] Got ${res}`)
14 });
15 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-49-320.jpg)
![1 const id = process.argv.slice(2);
2
3 app.listen(3005, () => {
4 console.log(` [x] Requesting user ${id}`);
5
6 request(`http://localhost:3000/${id}`)
7 .then((res) => {
8 return console.log(` [.] Got ${res}`)
9 });
10 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-50-320.jpg)
![1 const amqp = require('amqplib/callback_api');
2
3 amqp.connect('amqp://localhost', (err, conn) => {
4 conn.createChannel((err, ch) => {
5 const q = 'rpc_queue';
6
7 ch.assertQueue(q, { durable: false });
8 ch.prefetch(1);
9
10 console.log(' [x] Awaiting RPC requests');
11
12 ch.consume(q, function reply(msg) {
13 const id = parseInt(msg.content.toString(), 10);
14
15 console.log(` [.] ID ${id}`);
16
17 ch.sendToQueue(msg.properties.replyTo,
18 new Buffer('name: Ada Lovelace, occupation: programmer'),
19 { correlationId: msg.properties.correlationId });
20
21 ch.ack(msg);
22 });
23 });
24 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-65-320.jpg)
![Retrieve message
from rpc_queue
12 ch.consume(q, function reply(msg) {
13 const id = parseInt(msg.content.toString(), 10);
14
15 console.log(` [.] ID ${id}`);](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-67-320.jpg)
![1 const amqp = require('amqplib/callback_api');
2 const uuid = require('uuid');
3
4 const id = process.argv.slice(2);
5
6 amqp.connect('amqp://localhost', (err, conn) => {
7 conn.createChannel((err, ch) => {
8 ch.assertQueue('', { exclusive: true }, (err, q) => {
9
10 const corr = uuid();
11 console.log(` [x] Requesting user ${id}`);
12
13 ch.consume(q.queue, (msg) => {
14 if (msg.properties.correlationId === corr) {
15 console.log(` [.] Got ${msg.content.toString()}`);
16 setTimeout(function() { conn.close(); process.exit(0) }, 500);
17 }
18 }, {noAck: true});
19
20 ch.sendToQueue('rpc_queue',
21 new Buffer(id.toString()),
22 { correlationId: corr, replyTo: q.queue });
23 });
24 });
25 });](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-70-320.jpg)
![Retrieve response
from callback queue
13 ch.consume(q.queue, (msg) => {
14 if (msg.properties.correlationId === corr) {
15 console.log(` [.] Got ${msg.content.toString()}`);
16 setTimeout(function() { conn.close();
process.exit(0) }, 500);
17 }
18 }, {noAck: true});](https://image.slidesharecdn.com/braziljs-170828184953/85/Microservices-using-Node-js-and-RabbitMQ-73-320.jpg)
Uploaded byCarolina Pascale Campos
Microservices using Node.js and RabbitMQ
This document discusses using microservices with Node.js and RabbitMQ. It outlines reasons for adopting a microservices architecture like team structure and scalability. It also describes positives like new technologies and minimum effort/impact. Negatives include the shotgun effect, unstable interfaces, slow integration tests, and user-service dependencies. The document shows examples of using RabbitMQ for messaging between microservices and RPC calls. It concludes that any system's structure will reflect the organization's communication structure.
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- 46. 1 const express= require('express'); 2 const bodyParser = require('body-parser'); 3 4 const app = express(); 5 app.use(bodyParser.json()); 6 7 app.listen(3000, () => { 8 console.log(' [x] Awaiting for requests'); 9 }); 10 11 app.get('/:id', (request, response) => { 12 const id = request.params.id; 13 14 console.log(` [.] ID ${id}`); 15 16 response.status(200).json({ 17 data: { 18 name: 'Ada Lovelace', 19 occupation: 'Programmer' 20 } 21 }); 22 });
- 47. 1 app.listen(3000, ()=> { 2 console.log(' [x] Awaiting for requests'); 3 }); 4 5 app.get('/:id', (request, response) => { 6 const id = request.params.id; 7 8 console.log(` [.] ID ${id}`); 9 10 response.status(200).json({ 11 data: { 12 name: 'Ada Lovelace', 13 occupation: 'Programmer' 14 } 15 }); 16 });
- 48.
- 49. 1 const express= require('express'); 2 const request = require('request-promise'); 3 4 const id = process.argv.slice(2); 5 6 const app = express(); 7 8 app.listen(3005, () => { 9 console.log(` [x] Requesting user ${id}`); 10 11 request(`http://localhost:3000/${id}`) 12 .then((res) => { 13 return console.log(` [.] Got ${res}`) 14 }); 15 });
- 50. 1 const id= process.argv.slice(2); 2 3 app.listen(3005, () => { 4 console.log(` [x] Requesting user ${id}`); 5 6 request(`http://localhost:3000/${id}`) 7 .then((res) => { 8 return console.log(` [.] Got ${res}`) 9 }); 10 });
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- 65. 1 const amqp= require('amqplib/callback_api'); 2 3 amqp.connect('amqp://localhost', (err, conn) => { 4 conn.createChannel((err, ch) => { 5 const q = 'rpc_queue'; 6 7 ch.assertQueue(q, { durable: false }); 8 ch.prefetch(1); 9 10 console.log(' [x] Awaiting RPC requests'); 11 12 ch.consume(q, function reply(msg) { 13 const id = parseInt(msg.content.toString(), 10); 14 15 console.log(` [.] ID ${id}`); 16 17 ch.sendToQueue(msg.properties.replyTo, 18 new Buffer('name: Ada Lovelace, occupation: programmer'), 19 { correlationId: msg.properties.correlationId }); 20 21 ch.ack(msg); 22 }); 23 }); 24 });
- 66. rpc_queue Response Channel 3 amqp.connect('amqp://localhost', (err,conn) => { 4 conn.createChannel((err, ch) => { 5 const q = 'rpc_queue';
- 67. Retrieve message from rpc_queue 12ch.consume(q, function reply(msg) { 13 const id = parseInt(msg.content.toString(), 10); 14 15 console.log(` [.] ID ${id}`);
- 68. Send response to callbackqueue 17 ch.sendToQueue(msg.properties.replyTo, 18 new Buffer('name: Ada Lovelace, occupation: programmer’), 19 { correlationId: msg.properties.correlationId });
- 69.
- 70. 1 const amqp= require('amqplib/callback_api'); 2 const uuid = require('uuid'); 3 4 const id = process.argv.slice(2); 5 6 amqp.connect('amqp://localhost', (err, conn) => { 7 conn.createChannel((err, ch) => { 8 ch.assertQueue('', { exclusive: true }, (err, q) => { 9 10 const corr = uuid(); 11 console.log(` [x] Requesting user ${id}`); 12 13 ch.consume(q.queue, (msg) => { 14 if (msg.properties.correlationId === corr) { 15 console.log(` [.] Got ${msg.content.toString()}`); 16 setTimeout(function() { conn.close(); process.exit(0) }, 500); 17 } 18 }, {noAck: true}); 19 20 ch.sendToQueue('rpc_queue', 21 new Buffer(id.toString()), 22 { correlationId: corr, replyTo: q.queue }); 23 }); 24 }); 25 });
- 71. Callback Queue Request Channel 6 amqp.connect('amqp://localhost',(err, conn) => { 7 conn.createChannel((err, ch) => { 8 ch.assertQueue('', { exclusive: true }, (err, q) => {
- 72. Request to rpc_queue 10const corr = uuid(); 20 ch.sendToQueue('rpc_queue', 21 new Buffer(id.toString()), 22 { correlationId: corr, replyTo: q.queue });
- 73. Retrieve response from callbackqueue 13 ch.consume(q.queue, (msg) => { 14 if (msg.properties.correlationId === corr) { 15 console.log(` [.] Got ${msg.content.toString()}`); 16 setTimeout(function() { conn.close(); process.exit(0) }, 500); 17 } 18 }, {noAck: true});
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- 81. Any organization thatdesigns a system (defined broadly) will produce a design whose structure is a copy of the organization's communication structure. Conway's Law
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- 84. How to solve myteam problems?
- 85. Shotgun effect Unstable interfaces Integrationtests User-service dependency
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- 90. Shotgun effect Unstable interfaces Integrationtests User-service dependency
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