Backend, app e internet das coisas com NodeJS no Google Cloud Platform
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The document provides an overview of building backend applications and IoT solutions using Node.js and Google Cloud Platform. It discusses the advantages of Google Cloud, scalability options, and includes a case study on a book notifier application that uses various technologies including React Native, Firebase, and Alexa. It covers key components like backend setup, APIs for book fetching, and integration with push notifications and Alexa skills.
![Serviço de Livros - Salvando
const Datastore = require('@google-cloud/datastore');
// Instantiates a client
const datastore = Datastore({
projectId: config.projectId
});
const kind = 'Book';
class BookService {
/* Codigo omitido */
async save(book) {
let slug = this.getSlug(book);
book.slug = slug;
const bookKey = datastore.key([kind, slug]);
let bookEntity = {
key: bookKey,
data: book
};
return datastore.save(bookEntity);
}
}
56](https://image.slidesharecdn.com/backendappeinternetdascoisasconnodejsnogcp-170326212409/85/Backend-app-e-internet-das-coisas-com-NodeJS-no-Google-Cloud-Platform-56-320.jpg)
![Serviço de Livros - Consulta
// The kind for the new entity
const kind = 'Book';
class BookService {
/* Codigo omitido */
async all() {
const query = datastore.createQuery(kind)
.order('date', { descending: true });
let results = await datastore.runQuery(query);
return results[0];
}
}
57](https://image.slidesharecdn.com/backendappeinternetdascoisasconnodejsnogcp-170326212409/85/Backend-app-e-internet-das-coisas-com-NodeJS-no-Google-Cloud-Platform-57-320.jpg)
Backend, app e internet das coisas com NodeJS no Google Cloud Platform
- 1. Backend, App e Internet das Coisas com NodeJS e Google Cloud Platform Alvaro Viebrantz aviebrantz.com.br @alvaroviebrantz medium.com/iot-bootcamp 1
- 2. Alvaro Viebrantz DevMT e GDGCuiabá Fullstack developer aviebrantz.com.br // @alvaroviebrantz medium.com/iot-bootcamp 2
- 3. Agenda • O que é computação em nuvem. • Google Cloud Platform Overview. • NodeJS • Estudo de Caso - PacktPub Notifier • Backend - Google App Engine • App - React Native + Firebase • IoT - Alexa Custom Skill 3
- 4. 4
- 5. 38anos Computadores Primitivos Computadores Pessoais 5
- 7. 12anos Internet Smartphones / Nuvem / Mobile 7
- 8. “The more advanced we become the faster we become at advancing” "Marco Annunziata: Welcome to the Age of the Industrial Internet"8
- 9. 9
- 10. 10
- 11. 4.7 bilhões de página A Web é gigante hoje Era do Zetabyte* * 1000 Exabytes 36.000 anos de video em hd Últimos 20anos http://www.livescience.com/54094-how-big-is-the-internet.html 11
- 12. Nossa noção de sucesso mudou… 12
- 13. 13
- 14. 14
- 16. 16
- 17. Como isso é possível ? 17
- 18. 18
- 19. 19
- 22. 22
- 23. Porque Google Cloud Platform ? 23
- 24. O Google Cloud Platform é construído na mesma infraestrutura que os serviços do google rodam • Rede Global • Redundância • Infraestrutura inovadora 24
- 25. 25
- 26. Regiões 26
- 27. Vantagens Preço (Cobrança por minuto) Maquinas Customizáveis (até GPU) Facilmente Escalável Developer Experience ❤ 27
- 28. 28
- 29. 29
- 31. Estudo de Caso PacktPub Notifier Backend App IoT 31
- 32. 32
- 33. Node.js • Engine V8 do Google Chrome • Rápido e escalável • Orientado a eventos e não bloqueante • Muito leve • Perfeito para aplicações real-time 33
- 34. É apenas Javascript • Navegador • Server side • Desktop - Electron e NW • Mobile - Cordova, Ionic, React Native, etc. • Embarcado - Mongoose OS e Espruino • Geladeira, torradeira, etc 34
- 35. Ecossistema rico • Muitas ferramentas feitas com Node • Webpack ❤ • Gerenciadores de pacotes • NPM e Yarn • Editores • Visual Studio Code, Atom, Webstorm • Mais de 450 mil pacotes no npmjs.com 35
- 36. Web Frameworks • Express.js • Hapi.js • Koa 36
- 37. Stack escolhido • Hapi.js no Backend • Aplicativos iOS e Android nativos com React Native • Vários serviços do GCP • Database, Cron, Tasks, HTTPS, etc 37
- 38. PacktPub Notifier v0.1 iOS e Android Packt Publishing Website Backend 38
- 39. Hello World com HapiJS const Hapi = require('hapi'); const server = new Hapi.Server(); server.connection({ host: '0.0.0.0', port: process.env.PORT || 8080 }); server.route({ method: 'GET', path: '/api/tasks/fetch-books', config: { handler: (request, reply) => { reply({ message: 'Hello World'}) } } }); server.start((err) => { if (err) { throw err; } }); 39
- 40. Web Scrapping 'use strict'; const cheerio = require('cheerio'); const fetch = require('node-fetch'); const urlFreeLearning = 'http://www.packtpub.com/packt/offers/free-learning/'; class PackPubCrawler { /* Código omitido */ async fetchBooksFromPacktPub() { let body = await this.fetchPageBody(); let documentSelector = cheerio.load(body); let currentBook = this.scrapeCurrentBook(documentSelector); return { currentBook }; } } module.exports = PackPubCrawler; 40
- 41. Api de Livros 'use strict'; const Boom = require('boom'); const PackPubCrawler = require('../PacktPubCrawler'); module.exports = { method: 'GET', path: '/api/books', config: { handler: async (request, reply) => { try { const crawler = new PackPubCrawler(); let books = await crawler.fetchBooksFromPacktPub(); console.log('Success Fetching Books'); reply({ books }); } catch (e) { console.log('Error Fetching Books', e); reply(Boom.badGateway('Xablau', e)) } } } } 41
- 42. Api de Livros 42
- 43. 43
- 44. Nuvem IaaS Infrastructre as a Service CaaS Container/Cluster as a Service PaaS Platform as a Service SaaS Software as a Service GoogleVocê 44
- 45. Nuvem IaaS Infrastructre as a Service On Premise PaaS Platform as a Service SaaS Software as a Service • Aplicação • Dados • Runtime • Middleware • SO • Virtualização • Servidores • Storage • Redes • Aplicação • Dados • Runtime • Middleware • SO • Virtualização • Servidores • Storage • Redes • Aplicação • Dados • Runtime • Middleware • SO • Virtualização • Servidores • Storage • Redes • Aplicação • Dados • Runtime • Middleware • SO • Virtualização • Servidores • Storage • Redes Gerenciado por você Gerenciado magicamente45
- 46. Google App Engine - Standard vs Flexible 46
- 47. 47
- 48. 48
- 50. 1. Instale o Cloud SDK (cli) 2. Configure o app.yaml 3. cloud app deploy https://cloud.google.com/sdk/ runtime: nodejs env: flex skip_files: - ^node_modules$ resources: cpu: .5 memory_gb: .6 disk_size_gb: 10 manual_scaling: instances: 1 #automatic_scaling: # min_num_instances: 1 # max_num_instances: 1 # cool_down_period_sec: 120 # cpu_utilization: # target_utilization: 0.8 50
- 51. PacktPub Notifier v0.1 - Fail 51
- 52. Really slow rest api 52
- 53. PacktPub Notifier v0.2 iOS e Android Packt Publishing Website Storage Database 53
- 54. We need a database 54
- 55. NoSQL escolhido - Flexibilidade 55
- 56. Serviço de Livros - Salvando const Datastore = require('@google-cloud/datastore'); // Instantiates a client const datastore = Datastore({ projectId: config.projectId }); const kind = 'Book'; class BookService { /* Codigo omitido */ async save(book) { let slug = this.getSlug(book); book.slug = slug; const bookKey = datastore.key([kind, slug]); let bookEntity = { key: bookKey, data: book }; return datastore.save(bookEntity); } } 56
- 57. Serviço de Livros - Consulta // The kind for the new entity const kind = 'Book'; class BookService { /* Codigo omitido */ async all() { const query = datastore.createQuery(kind) .order('date', { descending: true }); let results = await datastore.runQuery(query); return results[0]; } } 57
- 58. API de tarefa de busca e armazenamento de livros module.exports = { method: 'GET', path: '/api/tasks/fetch-books', config: { handler: async (request, reply) => { const crawler = new PackPubCrawler(); let books = await crawler.fetchBooksFromPacktPub(); const service = new BooksService(); let slug = service.getSlug(books.currentBook); let exists = await service.exists(slug); if (!exists) { // Save new book await service.save(books.currentBook); //TODO: Notify clients that subscribed to this } reply({ books }); } } } 58
- 59. API de Livros const BooksService = require('../BooksService'); module.exports = { method: 'GET', path: '/api/books', config: { handler: async (request, reply) => { let service = new BooksService(); let books = await service.all(); reply({ books }); } } } 59
- 60. API de Livros 60
- 62. PacktPub Notifier v0.2 iOS e Android Packt Publishing Website 62
- 63. Agendamento de tarefas Como fazer em ambiente distribuido ? 63
- 65. Agendamento de tarefas - Gambiarra 65
- 66. 1. Sintaxe do unix cron ou mais natural 2. Configure um cron.yaml 3. cloud app deploy cron.yaml Google App Engine - cron.yaml cron: - description: fetch book every 30 mins url: /api/tasks/fetch-books schedule: every 30 mins target: default 66
- 67. Google App Engine - cron.yaml 67
- 68. Google App Engine - Logs, monitoramento e trace 1. Pacote @google/cloud-trace 2. Just works if (process.env.NODE_ENV === 'production') { require('@google/cloud-trace').start(); } 68
- 69. Google App Engine - Logs, monitoramento e trace 69
- 70. Google App Engine - Logs, monitoramento e trace 70
- 71. PacktPub Notifier v0.5 iOS e Android Packt Publishing Website 71
- 72. Push Notifications 72% Abrem o app quando recebe uma notificação 72
- 73. Fluxo Push Notifications Android iOS Backend GCM APNS Device Token 73
- 74. 74
- 75. 75
- 76. const admin = require("firebase-admin"); let credential = admin.credential.applicationDefault(); admin.initializeApp({ credential, databaseURL: "https://iot-bootcamp-158521.firebaseio.com" }); const messaging = admin.messaging(); const TOPIC_NAME = 'receive_book_notification'; class BookNotificationService { async notifyAllClients(book) { var payload = { notification: { title: `${book.title} is free today!`, body: `Open the app to claim this book.` } }; return messaging.sendToTopic(TOPIC_NAME, payload); } } Firebase Admin SDK 76
- 77. Client Side - React Native import Firestack from 'react-native-firestack'; import FCM from 'react-native-fcm'; const TOPIC_NAME = 'receive_book_notification'; async subscribe() { let { wantsToReceiveNotifications } = this.state; if (!wantsToReceiveNotifications) { FCM.requestPermissions(); FCM.subscribeToTopic(TOPIC_NAME); firestack.analytics.logEventWithName('subscribe', {}); } else { FCM.unsubscribeFromTopic(TOPIC_NAME); firestack.analytics.logEventWithName('unsubscribe', {}); } this.setState({ wantsToReceiveNotifications: ! wantsToReceiveNotifications }) } 77
- 78. Firebase Analytics e Push 78
- 79. iOS e Android PacktPub Notifier v0.8 Packt Publishing Website 79
- 80. 80
- 81. Fluxo Alexa Custom Skill Backend Usuário Alexa, Ask Packt Publishing Fan what’s the book of the day The free book of the day is title Learning Raspberry Pi Alexa Skill HTTPS 81
- 82. Api de integração com a Alexa const BooksService = require('../BooksService'); module.exports = { method: 'POST', path: '/api/alexa', config: { handler: async (request, reply) => { let service = new BooksService(); let book = await service.getLastBook(); let message = `The free book of the day is titled $ {book.title}`; reply({ "version": "1.0", "sessionAttributes": {}, "response": { "shouldEndSession": true, "outputSpeech": { "type": "SSML", "ssml": `<speak>${message}</speak>` }, } }); } } } 82
- 83. PacktPub Notifier - Final iOS e Android Amazon Echo Alexa Custom Skill Packt Publishing Website 83
- 84. Futuro ? 84
- 85. • Funções escritas em NodeJS • Escalabilidade automatica • Serverless • Podem ser chamadas por eventos • Mudanças de arquivo, banco, http, etc. 85
- 86. Serverless 86
- 88. Links úteis • https://cloud.google.com/sdk/ • https://developers.google.com • https://cloud.google.com/products/ • https://firebase.google.com • https://nodejs.org/en/ • https://developer.amazon.com • https://facebook.github.io/react-native/ 88
- 89. Referência • https://pt.slideshare.net/FrancescoMarchitelli1/google-cloud-platform-47074110 • https://www.infoq.com/br/presentations/plataforma-digital-com-google-cloud- platform • https://cloud.google.com/icons/ 89