{"id":2476,"date":"2017-01-02T15:00:00","date_gmt":"2017-01-02T15:00:00","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2476"},"modified":"2025-06-13T19:56:29","modified_gmt":"2025-06-14T02:56:29","slug":"using-couchbase-server-and-couchbase-mobile-in-the-same-project-with-nodejs","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/using-couchbase-server-and-couchbase-mobile-in-the-same-project-with-nodejs\/","title":{"rendered":"Usando o Couchbase Server e o Couchbase Mobile no mesmo projeto com o Node.js"},"content":{"rendered":"<p>A cria\u00e7\u00e3o de aplicativos da Web e aplicativos m\u00f3veis que compartilham os mesmos dados costuma ser considerada uma tarefa desafiadora. Como voc\u00ea projeta seu aplicativo Web para se adequar ao seu aplicativo m\u00f3vel e vice-versa? O que acontece quando voc\u00ea deseja usar o Couchbase para sincronizar seus dados entre dispositivos m\u00f3veis em tempo real, mas tamb\u00e9m t\u00ea-los dispon\u00edveis em um navegador da Web?<\/p>\n<p>H\u00e1 v\u00e1rias maneiras de realizar essa tarefa com o Couchbase, mas vamos explorar uma das minhas favoritas neste guia espec\u00edfico. Usaremos um SDK do lado do servidor para consultar dados e uma API RESTful para gravar dados.<\/p>\n<h2 id=\"the-requirements\">Os requisitos<\/h2>\n<p>Para este exemplo espec\u00edfico, seremos <a href=\"https:\/\/www.couchbase.com\/blog\/pt\/build-a-rest-api-with-node-js-express-and-couchbase\/\">usando Node.js<\/a>mas, na verdade, n\u00e3o importa qual linguagem voc\u00ea usa, desde que haja um SDK do Couchbase Server dispon\u00edvel. Os requisitos para esse projeto incluem o seguinte:<\/p>\n<ul>\n<li>Servidor Couchbase 4.1+<\/li>\n<li>Gateway de sincroniza\u00e7\u00e3o do Couchbase 1.3+<\/li>\n<li>Node.js 4.0+<\/li>\n<\/ul>\n<p>Do ponto de vista dos componentes, o Couchbase Server abrigar\u00e1 todos os nossos dados. Al\u00e9m disso, ele ser\u00e1 respons\u00e1vel pelo trabalho pesado envolvido na consulta. N\u00e3o escreveremos diretamente no Couchbase Server a partir do SDK do Node.js, mas, em vez disso, usaremos o Couchbase Sync Gateway. O Sync Gateway salvar\u00e1 os dados no Couchbase Server e os transmitir\u00e1 entre os dispositivos m\u00f3veis. O Node.js ser\u00e1 a camada de aplicativo da Web.<\/p>\n<p>N\u00e3o criaremos um aplicativo m\u00f3vel neste exemplo espec\u00edfico, mas um aplicativo m\u00f3vel se comunicaria com o Sync Gateway e seria usado de maneira semelhante. Os aplicativos m\u00f3veis n\u00e3o se comunicam diretamente com o Couchbase Server.<\/p>\n<h2 id=\"configuring-couchbase-server-and-couchbase-sync-gateway\">Configura\u00e7\u00e3o do Couchbase Server e do Couchbase Sync Gateway<\/h2>\n<p>Antes que o aplicativo possa ser desenvolvido, o Couchbase Server e o Couchbase Sync Gateway precisam ser instalados e configurados.<\/p>\n<p><a href=\"https:\/\/www.couchbase.com\/blog\/pt\/\">Download do servidor Couchbase<\/a> para o seu sistema operacional e prossiga com a instala\u00e7\u00e3o, certificando-se de que o servi\u00e7o de consulta (N1QL) esteja ativado. Para este exemplo, usarei um bucket do Couchbase chamado <strong>exemplo<\/strong>mas fique \u00e0 vontade para cham\u00e1-lo do que quiser.<\/p>\n<p>Com o <strong>exemplo<\/strong> criado, um \u00edndice N1QL deve ser adicionado para permitir a consulta dos dados. No Query Workbench ou CBQ, execute o seguinte:<\/p>\n<pre><code>CREATE PRIMARY INDEX ON `example` USING GSI;<\/code><\/pre>\n<p>O Query Workbench est\u00e1 dispon\u00edvel no Couchbase Server Enterprise Edition, mas a ferramenta de linha de comando CBQ est\u00e1 dispon\u00edvel em ambas as adi\u00e7\u00f5es.<\/p>\n<p>Nesse ponto, o Couchbase Server est\u00e1 pronto para funcionar.<\/p>\n<p>Baixe e instale o Couchbase Sync Gateway para o seu sistema operacional. O Sync Gateway em si n\u00e3o ser\u00e1 configurado, mas teremos um arquivo de configura\u00e7\u00e3o de projeto parecido com o seguinte em execu\u00e7\u00e3o:<\/p>\n<pre><code>{\r\n    \"log\":[\"CRUD+\", \"REST+\", \"Changes+\", \"Attach+\"],\r\n    \"databases\": {\r\n        \"example\": {\r\n            \"server\":\"https:\/\/localhost:8091\",\r\n            \"sync\":`\r\n                function (doc) {\r\n                    channel (doc.channels);\r\n                }\r\n            `,\r\n            \"users\": {\r\n                \"GUEST\": {\r\n                    \"disabled\": false,\r\n                    \"admin_channels\": [\"*\"]\r\n                }\r\n            }\r\n        }\r\n    },\r\n    \"CORS\": {\r\n        \"Origin\": [\"https:\/\/localhost:3000\"],\r\n        \"LoginOrigin\": [\"https:\/\/localhost:3000\"],\r\n        \"Headers\": [\"Content-Type\"],\r\n        \"MaxAge\": 17280000\r\n    }\r\n}<\/code><\/pre>\n<p>Chame o arquivo acima <strong>sync-gateway-config.json<\/strong> e armazen\u00e1-lo em seu projeto. Essencialmente, estamos dizendo ao Sync Gateway que queremos nos conectar a um determinado cluster do Couchbase Server e usar o bucket <strong>exemplo<\/strong>. Como usaremos solicita\u00e7\u00f5es RESTful da mesma m\u00e1quina, precisamos permitir CORS na porta 3000.<\/p>\n<p>Para manter as coisas simples, a l\u00f3gica de sincroniza\u00e7\u00e3o permitir\u00e1 que todos os documentos sejam transmitidos sem regras de leitura ou grava\u00e7\u00e3o.<\/p>\n<h2 id=\"creating-the-web-application\">Cria\u00e7\u00e3o do aplicativo Web<\/h2>\n<p>Na verdade, ainda n\u00e3o estamos executando o Sync Gateway, mas tanto o Couchbase Server quanto o Sync Gateway est\u00e3o prontos para uso. Agora podemos nos concentrar na cria\u00e7\u00e3o do nosso projeto Node.js.<\/p>\n<p>O projeto em si ser\u00e1 um exemplo muito simples. Vamos criar uma API RESTful com dois pontos de extremidade, um para criar dados e outro para listar dados. O problema aqui \u00e9 que um ponto de extremidade consultar\u00e1 o Couchbase Server diretamente com o SDK do Node.js e um ponto de extremidade gravar\u00e1 dados no Couchbase Sync Gateway por meio da API RESTful do Sync Gateway.<\/p>\n<p>Antes de nos adiantarmos, vamos come\u00e7ar a criar o projeto.<\/p>\n<h3 id=\"creating-a-new-project-and-bootstrapping-the-code\">Cria\u00e7\u00e3o de um novo projeto e inicializa\u00e7\u00e3o do c\u00f3digo<\/h3>\n<p>Como estamos usando o Node.js, tudo ser\u00e1 realizado no prompt de comando (Windows) ou no Terminal (Mac e Linux). Usando um deles, execute o seguinte:<\/p>\n<pre><code>npm init --y<\/code><\/pre>\n<p>O comando acima criar\u00e1 um novo <strong>package.json<\/strong> para o nosso projeto. Todas as depend\u00eancias do nosso projeto ser\u00e3o armazenadas nesse arquivo.<\/p>\n<p>Em seguida, execute o seguinte para obter todas as depend\u00eancias de que precisamos:<\/p>\n<pre><code>npm install couchbase express body-parser request --save<\/code><\/pre>\n<p>Vamos usar <code>couchbase<\/code> para se comunicar com nosso banco de dados, <code>expresso<\/code> para o Express Framework, <code>analisador de corpo<\/code> para aceitar dados do corpo em solicita\u00e7\u00f5es, e <code>solicita\u00e7\u00e3o<\/code> para fazer solicita\u00e7\u00f5es HTTP de dentro do Node.js, n\u00e3o para o Node.js.<\/p>\n<p>Nesse ponto, podemos come\u00e7ar a inicializar o aplicativo.<\/p>\n<p>Crie um arquivo chamado <strong>index.js<\/strong> dentro do projeto. Vamos us\u00e1-lo para todo o nosso aplicativo. Em aplicativos maiores ou de produ\u00e7\u00e3o, voc\u00ea pode considerar a possibilidade de dividi-lo em arquivos mais precisos para facilitar a manuten\u00e7\u00e3o, mas, neste exemplo, n\u00e3o h\u00e1 problema.<\/p>\n<p>Aberto <strong>index.js<\/strong> e incluem as seguintes importa\u00e7\u00f5es:<\/p>\n<pre><code>var Couchbase = require(\"couchbase\");\r\nvar Express = require(\"express\");\r\nvar BodyParser = require(\"body-parser\");\r\nvar Request = require(\"request\");<\/code><\/pre>\n<p>As depend\u00eancias que baixamos anteriormente foram importadas para o projeto. No entanto, elas n\u00e3o foram inicializadas.<\/p>\n<pre><code>var app = Express();\r\nvar N1qlQuery = Couchbase.N1qlQuery;\r\n\r\napp.use(BodyParser.json());\r\napp.use(BodyParser.urlencoded({ extended: true }));<\/code><\/pre>\n<p>As linhas acima inicializam o Express Framework, preparam o N1QL no aplicativo e permitem a aceita\u00e7\u00e3o de dados codificados em JSON e URL nos corpos das solicita\u00e7\u00f5es.<\/p>\n<p>Embora o N1QL esteja praticamente pronto para funcionar, ainda n\u00e3o nos conectamos ao cluster de servidores nem abrimos nosso bucket. Isso pode ser feito da seguinte forma:<\/p>\n<pre><code>var bucket = (new Couchbase.Cluster(\"couchbase:\/\/localhost\")).openBucket(\"example\");<\/code><\/pre>\n<p>Novamente, estamos usando um bucket que chamei de <strong>exemplo<\/strong> em uma etapa anterior.<\/p>\n<p>Por fim, como a \u00faltima parte da inicializa\u00e7\u00e3o do nosso projeto, podemos come\u00e7ar a servir o aplicativo:<\/p>\n<pre><code>var server = app.listen(3000, function() {\r\n    console.log(\"Listening on port %s...\", server.address().port);\r\n});<\/code><\/pre>\n<p>Quando estiver em execu\u00e7\u00e3o, o aplicativo da Web poder\u00e1 ser acessado em <strong>https:\/\/localhost:3000<\/strong> em um navegador da Web e em outros lugares.<\/p>\n<h3 id=\"adding-the-couchbase-node.js-sdk-and-restful-sync-gateway-logic\">Adi\u00e7\u00e3o do SDK do Couchbase Node.js e da l\u00f3gica do gateway de sincroniza\u00e7\u00e3o RESTful<\/h3>\n<p>Como mencionado anteriormente, este aplicativo permanecer\u00e1 simples para que seja f\u00e1cil de entender. Teremos apenas dois pontos de extremidade, um que usa o SDK do Couchbase Server e outro que usa a API RESTful do Sync Gateway.<\/p>\n<p>Esses dois pontos de extremidade ter\u00e3o a seguinte apar\u00eancia:<\/p>\n<pre><code>GET \/list\r\nPOST \/create<\/code><\/pre>\n<p>Come\u00e7ando com o <strong>\/lista<\/strong> temos o seguinte c\u00f3digo:<\/p>\n<pre><code>app.get(\"\/list\", function(req, res) {\r\n    bucket.query(N1qlQuery.fromString(\"SELECT type, firstname, lastname FROM `\" + bucket._name + \"` WHERE type = 'person'\"), function(error, result) {\r\n        if(error) {\r\n            return res.status(400).send(error);\r\n        }\r\n        res.send(result);\r\n    });\r\n});<\/code><\/pre>\n<p>Quando uma solicita\u00e7\u00e3o GET for feita a esse ponto de extremidade, uma consulta N1QL ser\u00e1 executada no Couchbase Server. Essa consulta obter\u00e1 o <code>tipo<\/code>, <code>primeiro nome<\/code>e <code>sobrenome<\/code> propriedades de todos os documentos no bucket espec\u00edfico, desde que esses documentos tenham um <code>tipo<\/code> propriedade que \u00e9 igual a <code>pessoa<\/code>. Se houver um erro, retorne um erro para o usu\u00e1rio; caso contr\u00e1rio, retorne os dados que foram recuperados.<\/p>\n<p>O pr\u00f3ximo endpoint usa solicita\u00e7\u00f5es HTTP no Node.js. Antes de ir direto para o endpoint, pode fazer sentido criar um m\u00e9todo auxiliar para fazer essas solicita\u00e7\u00f5es:<\/p>\n<pre><code>var makePostRequest = function(url, body, callback) {\r\n    Request.post(url, { json: body },\r\n        function (error, response, body) {\r\n            if (!error &amp;&amp; response.statusCode == 200) {\r\n                callback(null, body);\r\n            } else {\r\n                callback(error, null);\r\n            }\r\n        }\r\n    );\r\n}<\/code><\/pre>\n<p>O m\u00e9todo acima far\u00e1 uma solicita\u00e7\u00e3o POST para um URL espec\u00edfico, passando um objeto JavaScript como corpo. Se for bem-sucedido, a resposta ser\u00e1 retornada; caso contr\u00e1rio, ser\u00e1 exibido um erro.<\/p>\n<p>O <code>makePostRequest<\/code> O m\u00e9todo pode ser visto em a\u00e7\u00e3o no seguinte:<\/p>\n<pre><code>app.post(\"\/create\", function(req, res) {\r\n    if(!req.body.firstname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A firstname is required\"});\r\n    } else if(!req.body.lastname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A lastname is required\"});\r\n    }\r\n    makePostRequest(\"https:\/\/localhost:4984\/\" + bucket._name + \"\/\", {type: \"person\", firstname: req.body.firstname, lastname: req.body.lastname}, function(error, result) {\r\n        if(error) {\r\n            return res.status(400).send(error);\r\n        }\r\n        res.send(req.body);\r\n    });\r\n});<\/code><\/pre>\n<p>No c\u00f3digo acima, quando uma solicita\u00e7\u00e3o POST \u00e9 feita para o <strong>\/criar<\/strong> primeiro verificamos se determinadas propriedades existem no corpo, caso contr\u00e1rio, lan\u00e7amos um erro. Se elas existirem, usaremos a fun\u00e7\u00e3o <code>makePostRequest<\/code> passando o URL do m\u00e9todo <a href=\"https:\/\/developer.couchbase.com\/documentation\/mobile\/current\/references\/sync-gateway\/rest-api\/index.html\">Documenta\u00e7\u00e3o da API RESTful do Sync Gateway<\/a>.<\/p>\n<p>Nesse ponto, se for bem-sucedido, os dados ser\u00e3o salvos do Sync Gateway no Couchbase Server e transmitidos a todos os dispositivos conectados.<\/p>\n<h3 id=\"the-full-application-source-code\">O c\u00f3digo-fonte completo do aplicativo<\/h3>\n<p>Caso queira ver o aplicativo inteiro montado, o c\u00f3digo-fonte pode ser encontrado abaixo:<\/p>\n<pre><code>var Couchbase = require(\"couchbase\");\r\nvar Express = require(\"express\");\r\nvar BodyParser = require(\"body-parser\");\r\nvar Request = require(\"request\");\r\n\r\nvar app = Express();\r\nvar N1qlQuery = Couchbase.N1qlQuery;\r\n\r\napp.use(BodyParser.json());\r\napp.use(BodyParser.urlencoded({ extended: true }));\r\n\r\nvar bucket = (new Couchbase.Cluster(\"couchbase:\/\/localhost\")).openBucket(\"example\");\r\n\r\nvar makePostRequest = function(url, body, callback) {\r\n    Request.post(url, { json: body },\r\n        function (error, response, body) {\r\n            if (!error &amp;&amp; response.statusCode == 200) {\r\n                callback(null, body);\r\n            } else {\r\n                callback(error, null);\r\n            }\r\n        }\r\n    );\r\n}\r\n\r\napp.get(\"\/list\", function(req, res) {\r\n    bucket.query(N1qlQuery.fromString(\"SELECT type, firstname, lastname FROM `\" + bucket._name + \"` WHERE type = 'person'\"), function(error, result) {\r\n        if(error) {\r\n            return res.status(400).send(error);\r\n        }\r\n        res.send(result);\r\n    });\r\n});\r\n\r\napp.post(\"\/create\", function(req, res) {\r\n    if(!req.body.firstname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A firstname is required\"});\r\n    } else if(!req.body.lastname) {\r\n        return res.status(400).send({\"status\": \"error\", \"message\": \"A lastname is required\"});\r\n    }\r\n    makePostRequest(\"https:\/\/localhost:4984\/\" + bucket._name + \"\/\", {type: \"person\", firstname: req.body.firstname, lastname: req.body.lastname}, function(error, result) {\r\n        if(error) {\r\n            return res.status(400).send(error);\r\n        }\r\n        res.send(req.body);\r\n    });\r\n});\r\n\r\nvar server = app.listen(3000, function() {\r\n    console.log(\"Listening on port %s...\", server.address().port);\r\n});<\/code><\/pre>\n<p>Vamos explorar a execu\u00e7\u00e3o desse aplicativo na pr\u00f3xima etapa.<\/p>\n<h2 id=\"running-the-application\">Execu\u00e7\u00e3o do aplicativo<\/h2>\n<p>H\u00e1 muitas pe\u00e7as em movimento neste exemplo espec\u00edfico. Temos um aplicativo Node.js, o Couchbase Server e o Couchbase Sync Gateway. No futuro, voc\u00ea provavelmente tamb\u00e9m ter\u00e1 um aplicativo m\u00f3vel.<\/p>\n<p>A primeira coisa que queremos fazer \u00e9 iniciar o Sync Gateway e fazer com que ele se conecte ao nosso cluster do Couchbase Server j\u00e1 em execu\u00e7\u00e3o. Execute o seguinte em sua linha de comando:<\/p>\n<pre><code>\/path\/to\/sync_gateway \/path\/to\/sync-gateway-config.json<\/code><\/pre>\n<p>Com o Sync Gateway em execu\u00e7\u00e3o, voc\u00ea pode executar o aplicativo Node.js executando:<\/p>\n<pre><code>node index.js<\/code><\/pre>\n<p>O aplicativo agora deve estar acess\u00edvel em <strong>https:\/\/localhost:3000<\/strong> nos caminhos espec\u00edficos do ponto de extremidade.<\/p>\n<h2 id=\"conclusion\">Conclus\u00e3o<\/h2>\n<p>Voc\u00ea acabou de ver uma maneira poss\u00edvel de reunir seus aplicativos Couchbase Mobile e Couchbase Server. Embora n\u00e3o tenhamos realmente criado um aplicativo m\u00f3vel neste guia, usamos todos os componentes que o tornariam poss\u00edvel como uma etapa final. Criamos um aplicativo Node.js que usou o SDK do Couchbase Server Node.js e o Couchbase Sync Gateway.<\/p>","protected":false},"excerpt":{"rendered":"<p>Building web applications and mobile applications that share the same data is often thought of as a challenging task. How do you design your web application to fit with your mobile application and visa-versa? What happens when you want to [&hellip;]<\/p>","protected":false},"author":63,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1815,1810,1816,1822,2366],"tags":[1393,1745],"ppma_author":[9032],"class_list":["post-2476","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practices-and-tutorials","category-couchbase-mobile","category-couchbase-server","category-node-js","category-sync-gateway","tag-api","tag-restful"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Couchbase Server and Couchbase Mobile together with Node.js<\/title>\n<meta name=\"description\" content=\"This post focuses on creation of a Node.js application that used both the Couchbase Server Node.js 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