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    Neste tutorial, criaremos nosso aplicativo Dapp do zero. Este exercício demonstrará como estamos usando create-react-app e pollyfills para criar as decências de nó necessárias para o cliente pioneer. ![](https://hackmd.io/_uploads/ryDz48hq3.png) Direto para o código: https://github.com/BitHighlander/dapp-template Tecnologias usadas: - GitHub: GitHub é um sistema de controle de versão de código aberto para rastrear alterações no código-fonte. Ele é usado por milhões de desenvolvedores e empresas para armazenar e compartilhar seu código, gerenciar projetos e colaborar com outros desenvolvedores. - Create React App: Create React App é uma cadeia de ferramentas do Facebook que ajuda os desenvolvedores a criar rapidamente aplicativos React sem nenhuma configuração de compilação. Ele fornece uma configuração de compilação moderna sem configuração e ajuda os desenvolvedores a se concentrarem na escrita do código.chakra UX framework - Chakra UI Framework: Chakra UI é uma biblioteca de componentes para React que facilita a criação de interfaces de usuário acessíveis e combináveis. Ele foi desenvolvido pensando na acessibilidade e na usabilidade, permitindo que os desenvolvedores criem aplicativos acessíveis a todos os usuários. - KeepKey SDK: KeepKey SDK é um kit de desenvolvimento de software de código aberto para construir com a carteira de hardware KeepKey. - Pioneer API/SDK: O Pioneer API/SDK é um kit de ferramentas para criar aplicativos e serviços de blockchain. Ele fornece ferramentas para os desenvolvedores criarem aplicativos blockchain de maneira rápida e fácil, como carteiras, trocas e dapps. ## Resumo do que este guia cobre - Criar um aplicativo da Web de react básico. - Usar o KeepKey SDK para integrar com o KeepKey Desktop. - Usar Pioneer-SDK para consultar informações de blockchain. ## Primeiro importamos o Pioneer-sdk, e configuramos ``` const configPioneer = { queryKey:'sdk:test-tutorial-medium', username:"dash-dapp", spec:"https://pioneers.dev/spec/swagger.json" } let pioneer = new Client(configPioneer.spec,configPioneer) pioneer = await pioneer.init() ``` Estamos definindo a queryKey, nome de usuário e especificação > Os documentos da Pioneer API podem ser encontrados [aqui](https://pioneers.dev/docs) Em seguida, usamos o cliente API para consultar as entradas não gastas de um xpub. > Um xpub é uma chave pública usada em um sistema de carteira determinístico hierárquico, e mais informações podem ser encontradas nesta postagem do blog: https://www.swanbitcoin.com/whats-in-an-xpub/ ``` //get balance DASH let data = await pioneer.ListUnspent({network:'DASH',xpub:responsePubkey.xpub}) data = data.data console.log("txData: ",data) ``` E, finalmente, iteramos sobre essas entradas para calcular um saldo ``` let balance = 0 for(let i = 0; i < data.length; i++){ balance += parseInt(data[i].value) } console.log("balance: ",balance) let balanceNative = balance setBalance(balanceNative) ``` (NOTA) Você pode verificar [“checkpoint-2”](https://github.com/BitHighlander/dash-dapp/tree/checkpoint-1) para continuar o tutorial a partir deste ponto ## Webpack Wizard Agora, para um pouco de magia! Ao contrário do KeepKey-Desktop, que possui uma API principalmente estática e bem definida e é gerada estaticamente, o servidor Pioneer está mudando rapidamente e usa um módulo que se adapta dinamicamente quando as especificações do OpenAPI mudam. Ele usa um pacote chamado OpenAPI-Generator para gerar um cliente. Isso permite que os desenvolvedores não precisem atualizar o cliente npm local quando as especificações da API mudarem. ``` openapi-client-axios ``` O que na verdade, por baixo dos panos, usa um pacote chamado ``` json-schema-ref-parser ``` Para baixar e analisar dinamicamente novos arquivos swagger.json sempre que o cliente for executado. Isso permite que o cliente atualize e altere sem que os desenvolvedores precisem atualizar seus pacotes de cliente. Infelizmente, esses pacotes são construídos para node.js e exigirão que usemos alguma mágica do webpack e tragamos polyfills para suportá-los. Passo 1. traga o arquivo config-overrides.js ``` const webpack = require('webpack'); ``` ``` module.exports = function override(config) { const fallback = config.resolve.fallback || {}; Object.assign(fallback, { "crypto": require.resolve("crypto-browserify"), "stream": require.resolve("stream-browserify"), "assert": require.resolve("assert"), "http": require.resolve("stream-http"), "https": require.resolve("https-browserify"), "os": require.resolve("os-browserify"), "url": require.resolve("url"), "net": require.resolve("net"), // "zlib": require.resolve("zlib"), "zlib": require.resolve("browserify-zlib"), "path": require.resolve("path"), "tls": require.resolve("tls"), //@jsdevtools fs: false }) config.resolve.fallback = fallback; config.plugins = (config.plugins || []).concat([ new webpack.ProvidePlugin({ process: 'process/browser', Buffer: ['buffer', 'Buffer'] }) ]) return config; } ``` Modifique o próprio Webpack para jogar bem com framer-motion um pacote de UI de chakra webpack.config.js ``` module.exports = { rules: [ { test: /\.m?js/, resolve: { fullySpecified: false }, } ], node: { fs: "empty" } }; ``` Passo 2. instalar react-app-rewired ``` yarn add react-app-rewired ``` reconfigurar nossos scripts de execução ``` "scripts": { "start": "GENERATE_SOURCEMAP=false react-app-rewired start", "build": "react-app-rewired build", "test": "react-app-rewired test", "eject": "react-scripts eject" }, ``` Execute seu projeto! ``` yarn start ``` Veja sua página ao vivo ``` http://localhost:3000/ ``` Uma transmissão ao vivo da demonstração https://dapp-template-nine.vercel.app/

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