├── .gitignore ├── LICENSE ├── Makefile ├── README.adoc ├── bitcoin-websocket-client ├── Makefile ├── README.adoc ├── bitfinex.html ├── bitfinex.js ├── package-lock.json └── package.json ├── chat-websockets.gif ├── index.html ├── load-balancer.pptx ├── package-lock.json ├── package.json ├── public ├── estilo.css └── index.js ├── server.js └── websocket.html /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | .idea 3 | *.iml 4 | .DS_Store 5 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2016 Manoel Campos da Silva Filho 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | linux: 2 | @# Instala o nodejs e o gerenciador de pacotes (bibliotecas) npm 3 | sudo apt install nodejs npm -y 4 | 5 | @# Usa o npm para instalar o nodemon globalmente (e não na pasta atual) para iniciar facilmente a app servidora 6 | sudo npm i -g nodemon 7 | 8 | @# Adiciona o caminho das bibliotecas do node ao path do sistema, assim executáveis como o nodemon serão localizados ao serem digitados no terminal 9 | cat ~/.profile | grep 'PATH:~/node_modules/.bin' > /dev/null || echo 'export PATH=$$PATH:~/node_modules/.bin' >> ~/.profile 10 | 11 | @# O comando ". arquivo_script" é o mesmo que "source arquivo_script", mas funciona em diferentes shells. 12 | . ~/.profile 13 | 14 | macos: 15 | brew -v > /dev/null || (echo "Faça download do gerenciador de pacotes Homebrew em http://brew.sh" && exit -1) 16 | brew install nodejs npm 17 | sudo npm i -g nodemon 18 | cat ~/.profile | grep 'PATH:~/node_modules/.bin' > /dev/null || echo 'export PATH=$$PATH:~/node_modules/.bin' >> ~/.profile 19 | 20 | @# O comando ". arquivo_script" é o mesmo que "source arquivo_script", mas funciona em diferentes shells. 21 | . ~/.profile 22 | 23 | install: 24 | @# Instala as dependências da aplicação servidora (as bibliotecas utilizadas) 25 | npm i 26 | 27 | clean: 28 | rm -rf node_modules 29 | 30 | remove: 31 | @# Caso esteja ocorrendo erro na instalação, tente fazer make remove para desinstalar o nodejs e npm 32 | sudo apt-get remove nodejs npm && sudo apt-get autoremove -------------------------------------------------------------------------------- /README.adoc: -------------------------------------------------------------------------------- 1 | :source-highlighter: highlightjs 2 | :numbered: 3 | :icons: font 4 | 5 | ifdef::env-github[] 6 | :outfilesuffix: .adoc 7 | :caution-caption: :fire: 8 | :important-caption: :exclamation: 9 | :note-caption: :paperclip: 10 | :tip-caption: :bulb: 11 | :warning-caption: :warning: 12 | endif::[] 13 | 14 | = Aplicação de Mensagens Instantâneas utilizando WebSocket com Node.js 15 | 16 | NOTE: Acesse uma Playlist de vídeos mostrando todo o processo de desenvolvimento da aplicação https://www.youtube.com/watch?v=hEPAr4MPQjU&list=PLyo0RUAM69UvnqUq5SFeVahS_YTUVgq4v[aqui]. 17 | 18 | image:chat-websockets.gif[] 19 | 20 | Web chat utilizando http://nodejs.org:[Node.js]. Com Node.js podemos usar JavaScript no lado servidor. A aplicação utiliza http://websocket.org[WebSockets (recurso do HTML5)] com a biblioteca http://socket.io para implementar o chat. 21 | 22 | A biblioteca socket.io apenas facilita o uso do recurso de WebSocket. 23 | WebSocket é um protocolo https://pt.wikipedia.org/wiki/Duplex#Full-duplex[full-duplex] leve para transmissão de dados em aplicações web. 24 | Se tal biblioteca for usada em uma aplicação web em Node.js, quando é feita uma conexão WebSocket ao servidor, todo o extenso cabeçalho e corpo de uma mensagem HTTP é trafegado pela rede. Depois que a conexão é realizada, 25 | ela fica estabelecida com o servidor e, a partir daí, somente os dados enviados pela aplicação 26 | (normalmente digitados pelo usuário) e um pequeno cabeçalho (usualmente de apenas https://tools.ietf.org/html/rfc6455#section-5.2[32 bits]) serão enviados ao servidor. 27 | 28 | Apesar de ser possível abrir uma conexão HTTP e mantê-la aberta para requisições 29 | subsequentes, cada requisição trafega o cabeçalho e corpo das mensagens HTTP, aumentando 30 | o tráfego de rede e tempo para recebimento de respostas. 31 | No Firefox, podemos monitorar o tráfego HTTP e ver a quantidade de dados trafegados 32 | por meio do menu Ferramentas >> Web Developer >> Network (F12). 33 | 34 | No Chrome devemos acessar o botão `...`, depois `More Tools >> Developer Tools >> Network` (F12). 35 | Na mesma aba, na parte inferior, podemos ver os frames WebSocket enviados 36 | e como tais frames são pequenos. 37 | 38 | Para aplicações web de tempo real como jogos, mensagens instantâneas e edição colaborativa de documentos, o uso de conexões leves como WebSockets reduz problemas de escalabilidade geográfica e escalabilidade de tamanho (número de usuários). 39 | 40 | Com WebSockets, diferente de uma aplicação web tradicional usando HTTP, 41 | o servidor pode enviar dados para um cliente conectado, sem que o cliente primeiro requisite tais dados. 42 | Isto faz todo o sentido nas aplicações descritas acima, onde um usuário conectado pode receber dados de outro usuário, mesmo sem ter solicitado tais dados (um usuário pode estar conectado e receber uma mensagem de outro, sem ele ser obrigado à enviar uma requisição ao sevidor para solicitar o recebimento de tais dados). 43 | 44 | Este projeto baseado no exemplo disponível no https://socket.io/get-started/chat/[site do socket.io]. 45 | 46 | == Estrutura do Projeto 47 | 48 | - link:server.js[server.js]: representa a aplicação Node.js que permitirá aos clientes (por meio do navegador) interagirem no chat. 49 | - link:package.json[package.json]: representa o arquivo de configuração da aplicação servidora. Ele foi criando por meio de um assistante, digitando-se `npm init` no terminal. As dependências (bibliotecas utilizadas pela aplicação) foram baixadas e salvas em tal arquivo digitando-se `npm i express socket.io`. No entanto, como o `package.json` já está configurado, não é preciso executar estes dois comandos. 50 | - link:index.html[index.html]: página web que será disponibilizada aos clientes quando eles acessarem o 51 | servidor por meio do navegador. Tal página representa a parte cliente 52 | do chat. Por meio dela os usuários podem interagir entre si, utilizando 53 | o servidor como intermediário. 54 | - link:Makefile[Makefile]: arquivo que pode ser executado com o comando `make` no Linux/macOS para instalar as ferramentas necessárias. Ver seção de instalação abaixo. É interessante abrir tal arquivo para descobrir quais comandos estão sendo executados ao realizar o processo de instalação (como descrito a seguir). 55 | 56 | == Instalação 57 | 58 | O projeto usa o http://nodejs.org:[Node.js] para rodar o servidor e o http://npmjs.com:[npm] para gerenciar pacotes utilizados pela aplicação (como por exemplo, para baixar tais pacotes diretamente pelo terminal). 59 | 60 | Opcionalmente, pode-se usar o https://nodemon.io:[nodemon] para permitir monitorar alterações no código do servidor e reiniciá-lo automaticamente. Isto facilita muito o desenvolvimento pois não temos que parar o servidor manualmente cada vez que fizermos uma alteração no código. 61 | 62 | A seguir é mostrado como instalar tais ferramentas automaticamente no macOS, Linux e Windows. 63 | 64 | === macOS 65 | 66 | Para instalar as ferramentas no macOS, pode-se baixar o gerenciador de pacotes homebrew. 67 | A https://brew.sh[página oficial] mostra logo no topo a única instrução necessária para isto. 68 | Após instalar o homebrew, basta abrir um terminal no diretório raiz do projeto e executar `make macos`. 69 | 70 | === Linux 71 | 72 | Para instalar as ferramentas acima em Linux baseados em Debian (como Ubuntu e derivados), 73 | basta abrir um terminal no diretório raiz do projeto e executar `make linux`. 74 | No entanto, se ao executar o comando ocorrer erro indicando que o programa make não foi encontrado, 75 | execute um `sudo apt-get install make`. 76 | 77 | === Windows 78 | 79 | Os comandos acima são para Linux e macOS. 80 | Se você usa Windows, pode baixar manualmente o http://nodejs.org[Node.js] que os comandos npm descritos anteriormente 81 | possivelmente vão funcionar sem precisar de configurações adicionais. 82 | 83 | Mas se você quiser usar os mesmos comandos Linux da seção anterior 84 | (e ter disponíveis vários outros comandos existentes em Linux), 85 | pode baixar o https://docs.microsoft.com/en-us/windows/wsl/install-win10[Windows Subsystem for Linux]. 86 | Depois disso, basta seguir os passos da seção anterior. 87 | 88 | === Dependências da aplicação servidora 89 | 90 | Os pacotes (dependências) que são utilizados pela aplicação servidora são salvos na pasta `node_modules`. Esta pasta não é incluída e pode ser removida a qualquer momento (uma vez que podemos usar um comando para baixar os pacotes novamente). Assim, para baixar tais pacotes em tal pasta, basta executar `make install`. 91 | 92 | == Executando a Aplicação 93 | 94 | === Servidor 95 | 96 | Para iniciar o servidor, podemos executar: 97 | 98 | [source, bash] 99 | ---- 100 | npm start 101 | ---- 102 | 103 | Porém, utilizando o nodemon, basta fazer `nodemon` que ele vai procurar um arquivo `server.js` e iniciá-lo automaticamente. 104 | 105 | === Cliente 106 | 107 | Após iniciar o servidor, ele vai mostrar no terminal o endereço que a aplicação pode ser acessada pelo navegador (cliente). 108 | O endereço padrão é http://localhost:8000. 109 | Cada aba ou janela do navegador aberta em tal endereço representará um usuário do chat. 110 | 111 | == Aplicação Cliente sem o uso da biblioteca socket.io 112 | 113 | A biblioteca socket.io facilita bastante a criação de aplicações clientes e servidoras que usem o protocolo WebSocket. 114 | No entanto, ao usar tal biblioteca, a interoperabilidade de tais aplicações é prejudicada. 115 | Logo, fazer uma aplicação cliente que não usa socket.io se comunicar com um servidor socket.io é mais complicado. 116 | Isto pode ser percebido ao analisar o código da página link:websocket.html[websocket.html]. 117 | Esta é uma aplicação cliente que pode ser aberta simplesmente dando dois cliques no arquivo. 118 | Ela necessita que o servidor implementado aqui esteja em execução. 119 | Tal aplicação cliente usa os recursos de WebSockets nativos dos navegadores modernos, 120 | sem nenhuma biblioteca externa. 121 | 122 | == Hospedagem da Aplicação em Provedor de Nuvem 123 | 124 | Para podermos testar a aplicação remotamente, ela foi hospedada 125 | no https://render.com, um provedor de nuvem que fornece serviços que chamamos de Platform as a Service (PaaS). Tal provedor fornece gratuitamente uma plataforma para implantação (deploy) de aplicações, de modo que todo o processo de instalação das ferramentas necessárias para a execução da aplicação é automatizado e não temos que nos preocupar com nada disso. 126 | Isto inclui a instalação de: 127 | 128 | - ferramentas de execução (máquinas virtuais para Java, Node.js, Python, PHP, etc); 129 | - servidores web e de aplicação; 130 | - bibliotecas que tais aplicações utilizam. 131 | 132 | O Render é um serviço fantástico por se integrar com o GitHub. 133 | Ele detecta quando enviamos alterações para um repositório no GitHub (com git push), baixa o código e implanta a aplicação. 134 | Se tivermos aplicações em Java e outras linguagens que precisam ser compiladas, ele automatiza todo esse processo. 135 | Obviamente, seu projeto deve estar corretamente configurado, usando ferramentas de gerenciamento de dependências/automação 136 | de build como Maven e npm (este último que estamos usando aqui). 137 | 138 | Como esta aplicação é desenvolvida utilizando Node.js, o Render identifica isso pela existência do arquivo package.json e assim criar todo um ambiente de execução de aplicações Node pra gente. 139 | -------------------------------------------------------------------------------- /bitcoin-websocket-client/Makefile: -------------------------------------------------------------------------------- 1 | linux: 2 | @# Instala o nodejs e o gerenciador de pacotes (bibliotecas) npm 3 | sudo apt install nodejs npm -y 4 | 5 | @# Usa o npm para instalar o nodemon globalmente (e não na pasta atual) para iniciar facilmente a app servidora 6 | sudo npm i -g nodemon 7 | 8 | @# Adiciona o caminho das bibliotecas do node ao path do sistema, assim executáveis como o nodemon serão localizados ao serem digitados no terminal 9 | cat ~/.profile | grep 'PATH:~/node_modules/.bin' > /dev/null || echo 'export PATH=$$PATH:~/node_modules/.bin' >> ~/.profile 10 | 11 | @# O comando ". arquivo_script" é o mesmo que "source arquivo_script", mas funciona em diferentes shells. 12 | . ~/.profile 13 | 14 | macos: 15 | brew -v > /dev/null || (echo "Faça download do gerenciador de pacotes Homebrew em http://brew.sh" && exit -1) 16 | brew install nodejs npm 17 | sudo npm i -g nodemon 18 | cat ~/.profile | grep 'PATH:~/node_modules/.bin' > /dev/null || echo 'export PATH=$$PATH:~/node_modules/.bin' >> ~/.profile 19 | 20 | @# O comando ". arquivo_script" é o mesmo que "source arquivo_script", mas funciona em diferentes shells. 21 | . ~/.profile 22 | 23 | install: 24 | @# Instala as dependências da aplicação servidora (as bibliotecas utilizadas) 25 | npm i 26 | 27 | clean: 28 | rm -rf node_modules 29 | 30 | remove: 31 | @# Caso esteja ocorrendo erro na instalação, tente fazer make remove para desinstalar o nodejs e npm 32 | sudo apt-get remove nodejs npm && sudo apt-get autoremove -------------------------------------------------------------------------------- /bitcoin-websocket-client/README.adoc: -------------------------------------------------------------------------------- 1 | :source-highlighter: highlightjs 2 | :numbered: 3 | 4 | ifdef::env-github[] 5 | :outfilesuffix: .adoc 6 | :caution-caption: :fire: 7 | :important-caption: :exclamation: 8 | :note-caption: :paperclip: 9 | :tip-caption: :bulb: 10 | :warning-caption: :warning: 11 | endif::[] 12 | 13 | = Cotação de Criptomoedas usando WebSockets e API da bitfinex (link:https://kinolien.github.io/gitzip/?download=/manoelcampos/sd-websockets/tree/master/2.3-bitcoin-websocket-api[zip]) 14 | 15 | Aplicação que usa a API do serviço https://docs.bitfinex.com/reference/ws-public-ticker[bitfinex] para obter a cotação do BitCoin (e outroas criptomoedas) 16 | em tempo real. A aplicação envia um requisição para assinar um canal por onde receberá notificações sempre que o preço da criptomoeda solicitada mudar. 17 | 18 | == Estrutura do Projeto 19 | 20 | O projeto é composto de duas aplicações de exemplo independentes, para mostrar como obter a cotação de criptomoedas tanto no lado servidor quanto no lado cliente. Temos então: 21 | 22 | - um backend usando http://nodejs.org:[Node.js] e a biblioteca https://www.npmjs.com/package/ws[ws] para fazer acesso a serviços usando o protocolo WebSockets. 23 | - um frontend que não depende de nenhum backend, utilizando a classe WebSocket nativa do HTML5. 24 | 25 | === Backend 26 | 27 | O backend é composto pelos arquivos: 28 | 29 | - link:bitfinex.js[bitfinex.js]: representa a aplicação Node.js que obterá a cotação de uma criptomoeda e imprimirá no terminal. 30 | - link:package.json[package.json]: representa o arquivo de configuração da aplicação servidora. Ele foi criando por meio de um assistante, digitando-se `npm init` no terminal. As dependências (bibliotecas utilizadas pela aplicação) foram baixadas e salvas em tal arquivo digitando-se `npm install ws`. No entanto, como o `package.json` já está configurado, não é preciso executar estes dois comandos. 31 | - link:Makefile[Makefile]: arquivo que pode ser executado com o comando `make` no Linux/macOS para instalar as ferramentas necessárias. Ver seção de instalação abaixo. É interessante abrir tal arquivo para descobrir quais comandos estão sendo executados ao realizar o processo de instalação (como descrito a seguir). 32 | 33 | === Frontend 34 | 35 | O frontend é composto apenas pelo arquivo link:bitfinex.html[bitfinex.html]. Ele usa a biblioteca JQuery apenas para facilitar a manipulação dos campos HTML e exibir uma pequena animação quando a cotação da moeda é alterada. Basta dar dois cliques em tal arquivo para abrir o frontend. 36 | 37 | Você pode testar o frontend online http://manoelcampos.com/sd-websockets/2.3-bitcoin-websocket-api/bitfinex.html[aqui]. 38 | 39 | === Diferenças dos dois projetos 40 | 41 | Observe que apesar de ser usado JavaScript nos dois projetos, o código é levemente diferente. 42 | A implementação do WebSockets disponível no HTML5 é levemente diferente da implementação da biblioteca https://www.npmjs.com/package/ws[ws] que usamos no Node.js. 43 | 44 | == Servidor 45 | 46 | === Instalação 47 | 48 | O projeto usa o http://nodejs.org:[Node.js] para rodar o servidor e o http://npmjs.com:[npm] para gerenciar pacotes utilizados pela aplicação (como por exemplo, para baixar tais pacotes diretamente pelo terminal). 49 | 50 | Opcionalmente, pode-se usar o https://nodemon.io:[nodemon] para permitir monitorar alterações no código do servidor e reiniciá-lo automaticamente. Isto facilita muito o desenvolvimento pois não temos que parar o servidor manualmente cada vez que fizermos uma alteração no código. 51 | 52 | A seguir é mostrado como instalar tais ferramentas automaticamente no macOS, Linux e Windows. 53 | 54 | ==== macOS 55 | 56 | Para instalar as ferramentas no macOS, pode-se baixar o gerenciador de pacotes homebrew. 57 | A https://brew.sh[página oficial] mostra logo no topo a única instrução necessária para isto. 58 | Após instalar o homebrew, basta abrir um terminal no diretório raiz do projeto e executar `make macos`. 59 | 60 | ==== Linux 61 | 62 | Para instalar as ferramentas acima em Linux baseados em Debian (como Ubuntu e derivados), 63 | basta abrir um terminal no diretório raiz do projeto e executar `make linux`. 64 | No entanto, se ao executar o comando ocorrer erro indicando que o programa make não foi encontrado, 65 | execute um `sudo apt-get install make`. 66 | 67 | ==== Windows 68 | 69 | Os comandos acima são para Linux e macOS. 70 | Se você usa Windows, pode baixar manualmente o http://nodejs.org[Node.js] que os comandos npm descritos anteriormente 71 | possivelmente vão funcionar sem precisar de configurações adicionais. 72 | 73 | Mas se você quiser usar os mesmos comandos Linux da seção anterior 74 | (e ter disponíveis vários outros comandos existentes em Linux), 75 | pode baixar o https://docs.microsoft.com/en-us/windows/wsl/install-win10[Windows Subsystem for Linux]. 76 | Depois disso, basta seguir os passos da seção anterior. 77 | 78 | === Dependências do Servidor 79 | 80 | Os pacotes (dependências) que são utilizados pela aplicação servidora são salvos na pasta `node_modules`. Esta pasta não é incluída e pode ser removida a qualquer momento (uma vez que podemos usar um comando para baixar os pacotes novamente). Assim, para baixar tais pacotes em tal pasta, basta executar `make install`. 81 | 82 | === Executando o Servidor 83 | 84 | Para iniciar o servidor, podemos executar: 85 | 86 | [source, bash] 87 | ---- 88 | npm start 89 | ---- 90 | 91 | Porém, utilizando o nodemon, basta fazer `nodemon` que ele vai procurar um arquivo `index.js` e iniciá-lo automaticamente. 92 | 93 | Como não temos um frontend para tal aplicação, todas as informações são impressas no terminal. 94 | -------------------------------------------------------------------------------- /bitcoin-websocket-client/bitfinex.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Cotação de Criptomoedas 8 | 9 | 10 |

11 | Aplicação cliente que usa a API do serviço bitfinex 12 |

13 | 14 |

Usa a API do bitfinex para obter a cotação do bitcoin (e outras criptomoedas) em tempo real. 15 | Ela envia um requisição para assinar um canal por onde receberá notificações sempre que o preço 16 | da criptomoeda solicitada mudar. 17 | Tal aplicação utiliza apenas os recursos de WebSockets do HTML5 disponibilizados pelo navegador. 18 | Assim, ela não depende de uma aplicação servidora para obter a cotação da moeda. 19 | O projeto Node.js existente é uma aplicação servidora independente, 20 | mostrando como fazer a mesma coisa do lado do servidor e obter 21 | cotação em background. 22 |

23 | 24 |

25 |
26 |

27 | 28 |
29 | 30 | 31 | 32 | 91 | 92 | -------------------------------------------------------------------------------- /bitcoin-websocket-client/bitfinex.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Aplicação backend que usa a API do serviço bitfinex 3 | * para obter a cotação do Bitcoin (e outras criptomoedas) 4 | * em background. 5 | * Basta iniciar o servidor com npm start 6 | * 7 | * Ao iniciar, o backend envia requisição para assinar um canal por onde 8 | * a aplicação receberá notificações sempre que o preço 9 | * da criptomoeda solicitada mudar. 10 | * 11 | * A aplicação não usa o arquivo bitfinex.html, 12 | * que é apenas um exemplo de como fazer o mesmo mas 13 | * do lado do cliente com JavaScript puro. 14 | * 15 | * Referência: https://docs.bitfinex.com/reference/ws-public-ticker 16 | */ 17 | 18 | //Biblioteca cliente de WebSocket 19 | const WebSocket = require('ws') 20 | 21 | //Mensagem pra solicitar assinatura de cotação do valor do BitCoin em dolar. 22 | const subscriptionMsg = { 23 | event: 'subscribe', 24 | channel: 'ticker', 25 | from: 'BTC', 26 | to: 'USD' 27 | } 28 | 29 | //Campo exibido pela API do bitfinex 30 | subscriptionMsg.symbol = 't' + subscriptionMsg.from + subscriptionMsg.to 31 | 32 | //Endereço de acesso ao serviço (API) 33 | const ws = new WebSocket('wss://api-pub.bitfinex.com/ws/2') 34 | 35 | //Id do canal por onde as notificações de preço da criptomoeda serão entregues 36 | let channelId = 0 37 | 38 | /** 39 | * Registra um listener para indicar que, sempre 40 | * que uma mensagem for recebida pela conexão de websocket, 41 | * deve-se verificar o tipo da mensagem e extrair algum 42 | * informação dela. 43 | */ 44 | ws.onmessage = (msg) => { 45 | /* Se o conteúdo da mensagem for String, tal comando converte para JSON, 46 | ou seja, para um objeto javascript que poderemos acessar os campos facilmente. */ 47 | msg.data = JSON.parse(msg.data) 48 | 49 | /* Se o tipo do evento for 'subscribed', que a assinatura no canal para receber 50 | cotação de uma determinada criptomoeda foi aceita*/ 51 | if (msg.data['event'] === 'subscribed'){ 52 | //Obtém o id do canal da nossa assinatura para podermos exibir mensagens recebidas apenas deste canal 53 | channelId = msg.data.chanId 54 | console.log('Registrada assinatura de cotação de ' + subscriptionMsg.from + ' para ' + subscriptionMsg.to) 55 | } else if (msg.data[0] === channelId && msg.data[1][6] !== undefined){ 56 | /* Se a mensagem recebida for do canal ao qual fomos registrados anteriormente, 57 | então imprime os dados da mensagem. 58 | O conteúdo da mensagem é descrito no link no início deste arquivo. */ 59 | console.log(subscriptionMsg.from + ' = ' + subscriptionMsg.to + ' ' + msg.data[1][6]) 60 | } 61 | } 62 | 63 | //Envia solicitação de assinatura para ficar recebendo a cotação de uma criptomoeda em tempo real 64 | ws.onopen = () => ws.send(JSON.stringify(subscriptionMsg)) 65 | -------------------------------------------------------------------------------- /bitcoin-websocket-client/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "bitfinex-websocket-backend", 3 | "version": "1.0.0", 4 | "lockfileVersion": 2, 5 | "requires": true, 6 | "packages": { 7 | "": { 8 | "name": "bitfinex-websocket-backend", 9 | "version": "1.0.0", 10 | "license": "MIT", 11 | "dependencies": { 12 | "ws": "^7.1.2" 13 | } 14 | }, 15 | "node_modules/ws": { 16 | "version": "7.5.9", 17 | "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.9.tgz", 18 | "integrity": "sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==", 19 | "engines": { 20 | "node": ">=8.3.0" 21 | }, 22 | "peerDependencies": { 23 | "bufferutil": "^4.0.1", 24 | "utf-8-validate": "^5.0.2" 25 | }, 26 | "peerDependenciesMeta": { 27 | "bufferutil": { 28 | "optional": true 29 | }, 30 | "utf-8-validate": { 31 | "optional": true 32 | } 33 | } 34 | } 35 | }, 36 | "dependencies": { 37 | "ws": { 38 | "version": "7.5.9", 39 | "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.9.tgz", 40 | "integrity": "sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==", 41 | "requires": {} 42 | } 43 | } 44 | } 45 | -------------------------------------------------------------------------------- /bitcoin-websocket-client/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "bitfinex-websocket-backend", 3 | "version": "1.0.0", 4 | "description": "Acessa cotações de criptomoedas usando a API de WebSockets da bitfinex.com", 5 | "main": "bitfinex.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1", 8 | "start": "node bitfinex.js" 9 | }, 10 | "keywords": [ 11 | "websockets", 12 | "cryptocurrency", 13 | "client", 14 | "bitfinex" 15 | ], 16 | "author": "Manoel Campos da Silva Filho", 17 | 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"chat-nodejs-socket-io", 3 | "version": "1.0.0", 4 | "description": "Web chat utilizando nodejs. Com Node.js podemos usar JavaScript no lado servidor e no cliente. A aplicação utiliza WebSockets com a biblioteca http://socket.io para implementar o chat.", 5 | "main": "server.js", 6 | "dependencies": { 7 | "express": "^4.18.2", 8 | "socket.io": "^4.7.2" 9 | }, 10 | "devDependencies": { 11 | "nodemon": "^3.0.1", 12 | "xmlhttprequest-ssl": ">=1.6.1" 13 | }, 14 | "scripts": { 15 | "dev": "nodemon" 16 | }, 17 | "keywords": [ 18 | "client/server", 19 | "chat", 20 | "nodejs", 21 | "javascript", 22 | "websockets", 23 | "socket.io" 24 | ], 25 | "author": "Manoel Campos da Silva Filho", 26 | "license": "MIT" 27 | } 28 | -------------------------------------------------------------------------------- /public/estilo.css: -------------------------------------------------------------------------------- 1 | /* 2 | CSS Adatado de https://github.com/Roger-Melo/lyrics-search/blob/master/style.css 3 | @author Roger Melo 4 | */ 5 | 6 | * { 7 | box-sizing: border-box; 8 | } 9 | 10 | body { 11 | font-family: Arial, Helvetica, sans-serif; 12 | margin: 0; 13 | background-color: rgb(211, 211, 211); 14 | } 15 | 16 | ul { 17 | list-style: none; 18 | text-indent: -2em; 19 | } 20 | 21 | ul li:before { 22 | content: "\1F63A"; 23 | margin: 0 0.5em; 24 | } 25 | 26 | button { 27 | cursor: pointer; 28 | } 29 | 30 | button:active { 31 | transform: scale(0.95); 32 | } 33 | 34 | input:focus, button:focus { 35 | outline: none; 36 | } 37 | 38 | header { 39 | display: flex; 40 | flex-direction: column; 41 | align-items: center; 42 | justify-content: center; 43 | padding: 10px 0; 44 | position: relative; 45 | } 46 | 47 | header * { 48 | z-index: 1; 49 | } 50 | 51 | header h1 { 52 | margin: 0 0 30px; 53 | } 54 | 55 | form { 56 | position: relative; 57 | width: 500px; 58 | max-width: 100%; 59 | } 60 | 61 | form input { 62 | border: 0; 63 | border-radius: 50px; 64 | font-size: 16px; 65 | padding: 15px 30px; 66 | width: 100%; 67 | } 68 | 69 | form button { 70 | position: absolute; 71 | top: 2px; 72 | right: 1px; 73 | background-color: #10cce0; 74 | border: 0; 75 | border-radius: 50px; 76 | color: #fff; 77 | font-size: 16px; 78 | padding: 13px 30px; 79 | } -------------------------------------------------------------------------------- /public/index.js: -------------------------------------------------------------------------------- 1 | $(function () { 2 | const socket = io() 3 | 4 | socket.nickname = '' 5 | 6 | $('form').submit(() => submeterForm(socket)) 7 | 8 | socket.on('chat msg', exibirMsg) 9 | }) 10 | 11 | function exibirMsg(msg) { 12 | $('#messages').append($('
  • ').text(msg)) 13 | } 14 | 15 | function submeterForm(socket) { 16 | if (socket.nickname === '') { 17 | socket.nickname = $('#msg').val() 18 | socket.emit('login', socket.nickname) 19 | 20 | $('#msg').prop('placeholder', 'Digite uma mensagem'); 21 | $('#button1').html('Enviar'); 22 | 23 | socket.on('status', exibirMsgStatus) 24 | $('#msg').keypress(() => informaUsuariosInicioDigitacao(socket)) 25 | 26 | $('#msg').keyup(() => socket.emit('status', '')) 27 | } else { 28 | socket.emit('chat msg', $('#msg').val()) 29 | } 30 | 31 | $('#msg').val('') 32 | return false 33 | } 34 | 35 | function informaUsuariosInicioDigitacao(socket) { 36 | if (socket.nickname === '') { 37 | return 38 | } 39 | 40 | socket.emit('status', socket.nickname + ' está escrevendo...') 41 | } 42 | 43 | function exibirMsgStatus(msg) { 44 | $('#status').html(msg) 45 | console.log(msg) 46 | } -------------------------------------------------------------------------------- /server.js: -------------------------------------------------------------------------------- 1 | const express = require('express') 2 | 3 | // https://expressjs.com/en/4x/api.html 4 | const app = express() 5 | app.use(express.static("public")) 6 | 7 | // https://nodejs.org/api/http.html 8 | const http = require('http').Server(app) 9 | 10 | // https://socket.io 11 | const serverSocket = require('socket.io')(http) 12 | 13 | const PORTA = process.env.PORT || 8080 14 | 15 | const host = "http://localhost" 16 | 17 | http.listen(PORTA, () => { 18 | const portaStr = PORTA === 80 ? '' : ':' + PORTA 19 | if (process.env.HEROKU_APP_NAME) 20 | console.log('Servidor iniciado. Abra o navegador em ' + host) 21 | else console.log('Servidor iniciado. Abra o navegador em ' + host + portaStr) 22 | }) 23 | 24 | app.get('/', (req, res) => res.sendFile(__dirname + '/index.html')) 25 | 26 | function recebeConexaoUsuario(socket) { 27 | socket.on('login', (nickname) => registraLoginUsuario(socket, nickname)) 28 | socket.on('disconnect', () => console.log('Cliente desconectado: ' + socket.nickname)) 29 | socket.on('chat msg', (msg) => encaminhaMsgsUsuarios(socket, msg)) 30 | socket.on('status', (msg) => encaminhaMsgStatus(socket, msg)) 31 | } 32 | 33 | function encaminhaMsgStatus(socket, msg) { 34 | console.log(msg) 35 | socket.broadcast.emit('status', msg) 36 | } 37 | 38 | function encaminhaMsgsUsuarios(socket, msg) { 39 | serverSocket.emit('chat msg', `${socket.nickname} diz: ${msg}`) 40 | } 41 | 42 | function registraLoginUsuario(socket, nickname) { 43 | socket.nickname = nickname 44 | const msg = nickname + ' conectou' 45 | console.log(msg) 46 | serverSocket.emit('chat msg', msg) 47 | } 48 | 49 | serverSocket.on('connect', recebeConexaoUsuario) 50 | -------------------------------------------------------------------------------- /websocket.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Chat usando WebSocket 8 | 9 | 10 |

    11 | Aplicação de Chat que interopera com o servidor socket.io. Veja as instruções no README.adoc de como instalar e iniciar a aplicação servidora. 12 | Somente depois de iniciada, é que esta página funcionará. 13 |

    14 | 15 |

    Note que esta página é totalmente independente do código do servidor. 16 | Uma vez que o servidor esteja rodando, podendo executar esta página até 17 | mesmo dando dois cliques nela que conseguiremos nos comunicar com o servidor. 18 | Isto mostra como é possível ter uma aplicação servidora independente, 19 | feita por um desenvolvedor, enquanto o cliente pode ser feito por outro 20 | desenvolvedor. 21 |

    22 | 23 |

    Apesar da biblioteca socket.io facilitar o desenvolvimento de aplicações 24 | usando WebSocket, o uso dela no servidor dificulta o desenvolvimento de aplicações clientes que não utilizem 25 | a biblioteca. Isto pode ser percebido ao analisar o código para envio e tratamento de mensagens 26 | recebidas nesta página. 27 | 28 | Desta forma, para facilitar a interoperabilidade entre aplicações WebSocket desenvolvidas 29 | em diferentes linguagens e por diferentes programadores, 30 | o uso da biblioteca socket.io não é aconselhável. 31 |

    32 | 33 |
    34 | 35 | 36 | 37 | 38 | 39 |

    40 |
    41 | 42 | 43 | 44 | 152 | 153 | 154 | --------------------------------------------------------------------------------