{"componentChunkName":"component---src-templates-blog-detail-tsx","path":"/blog/2019-12-17-node-rest-api-with-serverless-scf-and-mongodb","result":{"data":{"currentBlog":{"id":"8d3e0a32-3028-5f67-b38e-9088a83b37ab","frontmatter":{"thumbnail":"https://img.serverlesscloud.cn/2020115/1579078112543-1577769064015-joshua-aragon-FGXqbqbGt5o-unsplash.jpg","authors":["Aceyclee"],"categories":["guides-and-tutorials"],"date":"2019-12-17T00:00:00.000Z","title":"使用 Serverless Framework，结合云函数 SCF、API 网关和云数据库 MySQL 构建 REST API","description":"本文介绍如何创建一个进行自动化面试评估的 Serverless 应用！","authorslink":["https://www.zhihu.com/people/Aceyclee"],"translators":null,"translatorslink":null,"tags":["Node.js","API 网关"],"keywords":"Serverless 自动化面试评估,Serverless 云数据库 MySQL,云函数 SCF","outdated":null},"wordCount":{"words":259,"sentences":62,"paragraphs":62},"fileAbsolutePath":"/opt/build/repo/content/blog/2019-12-17-node-rest-api-with-serverless-scf-and-mongodb.md","fields":{"slug":"/blog/2019-12-17-node-rest-api-with-serverless-scf-and-mongodb/","keywords":["java","nodejs","serverless","无服务器","云函数","candidate","Serverless","serverless","dev","candidateSubmission","service"]},"html":"

Serverless 字面意思是「无服务器」。根据语境的不同，Serverless 可能有不同的解读方\n法：比如它可能意味着使用 Firebase 等第三方托管的服务，也可能是腾讯云等云厂商提供\n的计算服务，或者可能是构建 Serverless 应用中所用到的无服务器框架。具体解读可参考\n：Serverless 基础概念入门

\n

本文将介绍如何使用云函数 SCF、API 网关、云数据库 MySQL 和 Serverless Framework\n构建 REST API。

\n

简单介绍一下：

\n\n

应用：Serverless 编程面试评估器

\n

在我目前团队的面试中，有一项是测验候选人的代码能力。我们会先给候选人布置一个一周\n完成的小作业，然后我们会评估作业的完成情况，来测试候选人是否足够优秀。

\n

我们打算把评估过程自动化，即使没有人干预，也能筛选出不合适的候选人。毕竟，能够自\n动化完成的任务就应该自动化。下面是这个应用的工作流程：

\n
    \n
  1. 团队将候选人的详细信息提交给系统；
    2. \n
  2. 系统根据候选人的技能和经验发送出一封带有标记的作业邮件，作业中包含了 Gradle\n或者 Maven project 等；
    3. \n
  3. 候选人编写代码并交付作业 (eg: gradle submitAssignment)，然后压缩候选人的源\n码并提交到系统；
    4. \n
  4. 收到作业后，系统将构建项目并运行所有的测试用例；
    5. \n
  5. 如果构建失败，候选人状态标记为 failed，并反馈给招聘团队
    6. \n
  6. 如果构建成功，我们将测试代码覆盖率，如果小于某个值，则标记 failed 并通知团队
    7. \n
  7. 如果构建成功并且代码覆盖率达标，那么我们将分析代码并计算代码质量得分，低于某\n个分数则标记 failed。反之则通过代码测试进入终面。
    8. \n
\n

在本教程中，我们将构建一个 REST API 来存储候选者的详细信息，并从头开始构建一个完整的\nServerless 应用。

\n

动手准备

\n

完成本教程之前，首先确保系统包含以下环境：

\n
    \n
  1. 一个可用的 腾讯云账户
    2. \n
  2. Node.js (版本号不低于 8.6，建议使用 10.0 及以上)
    3. \n
  3. Serverless Framework
    4. \n
\n

通过以下命令安装 Serverless Framework：

\n
$ npm install -g serverless
\n

你可以使用命令缩写 sls 来代替 serverless。

\n

Step 1：创建一个 Node.js 无服务器项目

\n

创建目录 coding-round-evaluator 并进入该目录：

\n
$ mkdir coding-round-evaluator && cd coding-round-evaluator
\n

在该目录下，我们开始搭建第一个微服务，它将保存候选人的详细信息，列出候选者并获取\n单个候选者的信息：

\n
$ sls create --template tencent-nodejs --path candidate-service --name candidate
\n

文件 candidate-service 的目录结构如下：

\n
.\n├── index.js\n├── package.json\n└── serverless.yml
\n

我们来看看这三个文件：

\n
    \n
  1. index.js：定义了你的云函数；
    2. \n
  2. package.json：定义了该服务所依赖的其他库；
    3. \n
  3. serverless.yml：定义 Serverless Framework 创建服务所用的资源配置。
    4. \n
\n

Step 2：创建用于提交候选人的 REST 资源

\n

我们先配置 serverless.yml 文件：

\n\n \n 复制代码\n \n \n
service: candidate # 定义服务名称\n\nprovider: # 云厂商相关配置\n  name: tencent\n  runtime: Nodejs8.9 # Nodejs8.9 or Nodejs6.10\n  credentials: ~/credentials\n\nplugins:\n  - serverless-tencent-scf\n\nfunctions: # 定义了 candidateSubmission 的功能\n  candidateSubmission:\n    handler: candidate.submit\n    events:\n      - apigw:\n          name: api\n          parameters:\n            stageName: release\n            serviceId:\n            httpMethod: POST
\n

现在，在 candidate-service 中创建一个新的 api 目录，将 handler.js 移到 api 目录。重命名 index.js 为\ncandidate.js；重命名 handle 为 submit.

\n {\n const response = {\n statusCode: 200,\n body: JSON.stringify({\n message: 'Go Serverless v1.0! Your function executed successfully!',\n input: event,\n }),\n };\n\n callback(null, response);\n};`, `76705782971652370000`)\"\n >\n \n 复制代码\n \n \n
'use strict';\n\nmodule.exports.submit = (event, context, callback) => {\n  const response = {\n    statusCode: 200,\n    body: JSON.stringify({\n      message: 'Go Serverless v1.0! Your function executed successfully!',\n      input: event,\n    }),\n  };\n\n  callback(null, response);\n};
\n

在执行部署前，需要安装 serverless 插件 serverless-tencent-scf：

\n
$ npm i serverless-tencent-scf --save-dev
\n

执行 serverless deploy 命令进行部署：

\n
$ sls deploy --debug
\n
Serverless: Packaging service...\nServerless: Excluding development dependencies...\nServerless: Creating Stack...\nServerless: Checking Stack create progress...\n.....\nServerless: Uploading service package to cos[sls-cloudfunction-ap-guangzhou]. candidate-dev-FahKxK-2019-12-25-16-54-31.zip\nServerless: Uploaded package successful /Users/yugasun/Desktop/Develop/@yugasun/mysql-demo/.serverless/candidate.zip\nServerless: Creating function candidate-dev-candidateSubmission\nServerless: Created function candidate-dev-candidateSubmission\nServerless: Setting tags for function candidate-dev-candidateSubmission\nServerless: Creating trigger for function candidate-dev-candidateSubmission\nServerless: Created apigw trigger candidate-dev-candidateSubmission_apigw for function candidate-dev-candidateSubmission success. service id service-nld6x64o url https://service-nld6x64o-1251556596.gz.apigw.tencentcs.com/release/candidate-dev-candidateSubmission\nServerless: Deployed function candidate-dev-candidateSubmission successful\nServerless: Service Information\nservice: candidate\nstage: dev\nregion: ap-guangzhou\nstack: candidate-dev\nresources: 1\nfunctions:   candidateSubmission: candidate-dev-candidateSubmission\n    POST - https://service-nld6x64o-1251556596.gz.apigw.tencentcs.com/release/candidate-dev-candidateSubmission
\n

现在，POST 操作可用了，您可以使用 cURL 等工具来发出 POST 请求。

\n
$ curl -X POST https://service-nld6x64o-1251556596.gz.apigw.tencentcs.com/release/candidate-dev-candidateSubmission
\n
{"message":"Go Serverless v1.0! Your function executed successfully!", "input":{...}}
\n

Step 3：将数据保存到云数据库 MySQL 上

\n

在开始连接数据库之前，你需要先创建一个 MySQL 实例，然后初始化数据库\nserverless。

\n\n \n 复制代码\n \n \n
provider: # 云厂商相关配置\n  name: tencent\n  region: ap-guangzhou\n  role: QCS_SCFFull # You must add a role who can connect to your clound mysql\n  runtime: Nodejs8.9 # Nodejs8.9 or Nodejs6.10\n  timeout: 60\n  vpcConfig: # you must set vpc config for mysql connnect\n    vpcId: vpc-xxx\n    subnetId: subnet-xxx\n  environment:\n    variables:\n      DB_HOST: 127.0.0.1\n      DB_USER: root\n      DB_PORT: 3306\n      DB_PASSWORD: 123\n      DB_DATABASE: serverless\n\nfunctions: # 定义了 candidateSubmission 的功能\n  candidateSubmission:\n    handler: candidate.submit\n    events:\n      - apigw:\n          name: api\n          parameters:\n            stageName: release\n            serviceId: xxx\n            httpMethod: POST
\n

安装依赖：

\n
$ npm install --save mysql2\n$ npm install --save uuid
\n

更新 api/candidate.js：

\n {\n const requestBody = JSON.parse(event.body);\n const fullname = requestBody.fullname;\n const email = requestBody.email;\n const experience = requestBody.experience;\n\n if (\n typeof fullname !== 'string' ||\n typeof email !== 'string' ||\n typeof experience !== 'number'\n ) {\n console.error('Validation Failed');\n callback(\n new Error("Couldn't submit candidate because of validation errors."),\n );\n return;\n }\n\n const timestamp = new Date().getTime();\n const candidate = {\n id: uuid.v4(),\n fullname: fullname,\n email: email,\n experience: experience,\n submittedAt: timestamp,\n updatedAt: timestamp,\n };\n try {\n console.log('Submitting candidate');\n const [data] = await pool.query('INSERT into candidates SET ?', candidate);\n console.log(data);\n return {\n statusCode: 200,\n body: JSON.stringify({\n message: \\`Sucessfully submitted candidate with email \\${email}\\`,\n candidateId: data.insertedId,\n }),\n };\n } catch (err) {\n console.log(err);\n return {\n statusCode: 500,\n body: JSON.stringify({\n message: \\`Unable to submit candidate with email \\${email}\\`,\n }),\n };\n }\n};`, `42617788855833805000`)\"\n >\n \n 复制代码\n \n \n
'use strict';\n\nconst uuid = require('uuid');\nconst mysql = require('mysql2');\n\n// init mysql connection\nfunction initMysqlPool() {\n  const { DB_HOST, DB_PORT, DB_DATABASE, DB_USER, DB_PASSWORD } = process.env;\n\n  const promisePool = mysql\n    .createPool({\n      host: DB_HOST,\n      user: DB_USER,\n      port: DB_PORT,\n      password: DB_PASSWORD,\n      database: DB_DATABASE,\n      connectionLimit: 1,\n    })\n    .promise();\n  promisePool.query(\n    `CREATE TABLE IF NOT EXISTS candidates (\n    id          VARCHAR(64)        NOT NULL,\n    fullname    TEXT          NOT NULL,\n    email       VARCHAR(64)      NOT NULL,\n    experience  INT UNSIGNED  NOT NULL,\n    submittedAt VARCHAR(64)      NOT NULL,\n    updatedAt   VARCHAR(64)      NOT NULL\n  );`,\n  );\n\n  return promisePool;\n}\n\nconst pool = initMysqlPool();\n\nmodule.exports.submit = async (event, context, callback) => {\n  const requestBody = JSON.parse(event.body);\n  const fullname = requestBody.fullname;\n  const email = requestBody.email;\n  const experience = requestBody.experience;\n\n  if (\n    typeof fullname !== 'string' ||\n    typeof email !== 'string' ||\n    typeof experience !== 'number'\n  ) {\n    console.error('Validation Failed');\n    callback(\n      new Error(\"Couldn't submit candidate because of validation errors.\"),\n    );\n    return;\n  }\n\n  const timestamp = new Date().getTime();\n  const candidate = {\n    id: uuid.v4(),\n    fullname: fullname,\n    email: email,\n    experience: experience,\n    submittedAt: timestamp,\n    updatedAt: timestamp,\n  };\n  try {\n    console.log('Submitting candidate');\n    const [data] = await pool.query('INSERT into candidates SET ?', candidate);\n    console.log(data);\n    return {\n      statusCode: 200,\n      body: JSON.stringify({\n        message: `Sucessfully submitted candidate with email ${email}`,\n        candidateId: data.insertedId,\n      }),\n    };\n  } catch (err) {\n    console.log(err);\n    return {\n      statusCode: 500,\n      body: JSON.stringify({\n        message: `Unable to submit candidate with email ${email}`,\n      }),\n    };\n  }\n};
\n

现在，可以执行部署了：

\n
$ serverless deploy -v
\n

这将创建数据表。

\n

要测试 API，可以再次使用 cURL

\n
$ curl -H "Content-Type: application/json" -X POST -d '{"fullname":"Shekhar Gulati","email": "shekhargulati84@gmail.com", "experience":12}' https://service-6qkg1mbu-1251556596.gz.apigw.tencentcs.com/release/candidate-dev-candidateSubmission
\n

您将从 API 收到如下响应：

\n
{\n  "message": "Sucessfully submitted candidate with email shekhargulati84@gmail.com",\n  "candidateId": "5343f0c0-f773-11e6-84ed-7bf29f824f23"\n}
\n

Step 4：获取所有候选人

\n

在 serverless.yml 里定义一个新函数：

\n\n \n 复制代码\n \n \n
listCandidates:\n  handler: candidate.list\n  description: List all candidates\n  events:\n    - apigw:\n        name: listApi\n        parameters:\n          stageName: release\n          serviceId: service-6qkg1mbu\n          httpMethod: GET
\n

在 api/candidate.js 里创建新功能：

\n {\n console.log('Scanning Candidate table.');\n try {\n const [data] = await pool.query('select * from candidates');\n return {\n statusCode: 200,\n body: JSON.stringify({\n candidates: data,\n }),\n };\n } catch (e) {\n console.log(e);\n return {\n statusCode: 500,\n body: JSON.stringify({\n message: \\`Unable to get candidates\\`,\n }),\n };\n }\n};`, `91685788666803500000`)\"\n >\n \n 复制代码\n \n \n
module.exports.list = async (event, context, callback) => {\n  console.log('Scanning Candidate table.');\n  try {\n    const [data] = await pool.query('select * from candidates');\n    return {\n      statusCode: 200,\n      body: JSON.stringify({\n        candidates: data,\n      }),\n    };\n  } catch (e) {\n    console.log(e);\n    return {\n      statusCode: 500,\n      body: JSON.stringify({\n        message: `Unable to get candidates`,\n      }),\n    };\n  }\n};
\n

再次执行部署操作：

\n
$ sls deploy
\n

部署成功后，您将能够使用 cURL 来测试 API。

\n
curl https://service-6qkg1mbu-1251556596.gz.apigw.tencentcs.com/release/candidate-dev-listCandidates\n{"experience":12,"id":"5343f0c0-f773-11e6-84ed-7bf29f824f23","email":"shekhargulati84@gmail.com","fullname":"Shekhar Gulati","submittedAt":1487598537164,"updatedAt":1487598537164}
\n

Step 5：按照 ID 来获取候选人的详细信息

\n

在 serverless.yml 里定义一个新函数：

\n\n \n 复制代码\n \n \n
  candidateDetails:\n    handler: candidate.get\n    events:\n      - apigw:\n          name: detailApi\n          parameters:\n            stageName: release\n            serviceId:\n            httpMethod: GET
\n

在 api/candidate.js 里定义一个新功能：

\n {\n try {\n const id = event.pathParameters.id;\n const [row] = await pool.query('SELECT * FROM candidates WHERE id = ?', [\n id,\n ]);\n callback(null, row);\n } catch (e) {\n console.log(e);\n callback(null, {\n statusCode: 500,\n body: JSON.stringify({\n message: \\`Unable to get candidate with id \\${id}\\`,\n }),\n });\n }\n};`, `77387407414197780000`)\"\n >\n \n 复制代码\n \n \n
module.exports.get = async (event, context, callback) => {\n  try {\n    const id = event.pathParameters.id;\n    const [row] = await pool.query('SELECT * FROM candidates WHERE id = ?', [\n      id,\n    ]);\n    callback(null, row);\n  } catch (e) {\n    console.log(e);\n    callback(null, {\n      statusCode: 500,\n      body: JSON.stringify({\n        message: `Unable to get candidate with id ${id}`,\n      }),\n    });\n  }\n};
\n

使用 cURL 测试 API：

\n
curl https://05ccffiraa.execute-api.us-east-1.amazonaws.com/dev/candidates/5343f0c0-f773-11e6-84ed-7bf29f824f23\n{"experience":12,"id":"5343f0c0-f773-11e6-84ed-7bf29f824f23","email":"shekhargulati84@gmail.com","fullname":"Shekhar Gulati","submittedAt":1487598537164,"updatedAt":1487598537164}
\n

小结

\n

至此，本文已经完整地展示了如何通过 Serverless Framework 来创建 REST API，源码下载：Serverless With Mysql。

\n
\n

传送门：

\n\n
\n

欢迎访问：Serverless 中文网，您可以在 最佳实践 里体验更多关于 Serverless 应用的开发！

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