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Mercure ou (a inesperada vontade de abandonar websockets)

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Mercure é uma nova proposta de protocolo para atualização em tempo real que resolve as principais dificuldades no desenvolvimento com websockets. Vamos ver na prática seu funcionamento e como você pode utilizá-lo hoje!

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Mercure ou (a inesperada vontade de abandonar websockets)

  1. 1. Mercure Ou (A inesperada vontade de abandonar websockets)
  2. 2. Mercure é um protocolo que permite enviar atualizações de dados para navegadores e outros clientes HTTP de maneira conveniente, rápida, confiável e energeticamente eficiente. É especialmente útil para publicar atualizações em tempo real de recursos servidos por APIs e aplicativos web e mobile.
  3. 3. Funcionalidades ● Suporte nativo (HTTP e SSE) ● Sem conexões persistentes? Não é um problema! ● Restabelecimento de conexão embutido… ● … assim como reconciliação de estado ● Autorização baseada em JWT ● Multiplexação HTTP/2 ● HATEOAS e GraphQL ● Auto-descoberta através de web linking (RFC 5988) ● Encriptação de mensagens ● Suporta até IE7 (😱) usando um polyfill EventSource ● Envio "connection-less" em ambientes controlados
  4. 4. Como? 1 Cliente assina a um tópico
  5. 5. Como? 2 Aplicação publica em um tópico
  6. 6. Como? 3 Hub notifica assinantes
  7. 7. WebSocket API de Alto Nível Autorização Reconxão Reconciliação de Estado HTTP/2 Draft de Standard API Baixo Nível Você deve implementar por si mesmo Idem Idem Sem suporte RFC6455 Mercure
  8. 8. bit.ly/mercure-app
  9. 9. HUB
  10. 10. HUB 0.6.2 ● Kubernetes ○ helm install stable/mercure ● Imagem Docker ○ dunglas/mercure ■ Demo no Azure App Services ● Serviço Gerenciado (beta fechado) ● Binário
  11. 11. HUB 0.6.2 JWT_KEY=a-very-complex-key ACME_HOSTS=hub.mercure.dev,hub2.mercure.dev ADDR=:https # 127.0.0.1:3000 ALLOW_ANONYMOUS=1 CERT_FILE=x.crt KEY_FILE=key.crt COMPRESS=1 CORS_ALLOWED_ORIGINS=* DEBUG=0 DEMO=0 HISTORY_SIZE=100 HISTORY_CLEANUP_FREQUENCY=0.3 PUBLISH_ALLOWED_ORIGINS=my.publisher.com PUBLISHER_JWT_KEY=publisher-specific-key SUBSCRIBER_JWT_KEY=subscriber-specific-key Variáveis de Ambiente
  12. 12. Subscriber
  13. 13. Subscriber export default { data: () => ({ temperature: 23.4, humidity: 42, updatedAt: '2019-09-24 23:12:42' }), methods: { updateWeather: function (payload) { this.temperature = parseFloat(payload.temperature).toFixed(1) this.humidity = parseInt(payload.humidity) this.updatedAt = payload.updatedAt } }, created () { const h = new URL('https://demo.mercure.com/hub') h.searchParams.append('topic', 'http://hub.casimiro.tech/weather') const es = new EventSource(h) es.onmessage = e => this.updateWeather(JSON.parse(e.data)) } Vue.js
  14. 14. Publisher
  15. 15. Publisher use SymfonyComponentMercurePublisher; use SymfonyComponentMercureUpdate; class ReadDht11Command extends Command { protected $publisher; public function __construct(Publisher $publisher) { $this->publisher = $publisher; } protected function execute(InputInterface $input, OutputInterface $output) { while(true){ // a:2:{s:8:"humidity";d:59.0;s:11:"temperature";d:21.8;} $read = unserialize(`/home/pi/read-dht11`); $update = new Update( 'http://hub.casimiro.tech/weather', json_encode([ 'temperature'=> $read['temperature'], 'humidity'=> $read['humidity'], 'updatedAt'=> date('Y-m-d H:i:s') ]) ); $this->publisher->__invoke($update); usleep(100000); } } } Symfony
  16. 16. Verificando os Updates
  17. 17. Considerações
  18. 18. Quer saber mais? https://mercure.rocks
  19. 19. https://duodra.co @duodraco linkedin.com/in/andersoncasimiro Ride the wind of a brand new day High where mountains stand Found my hope, and pride again Rebirth… of a man Time to fly…

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