serverless 如何調試(三)

在上篇文章中,咱們講解了如何調用咱們的hello-world應用,只須要使用命令:html

serverless invoke -f hello -l

,可是咱們總不可能修改一次代碼,就調用一下這個命令吧,或者說咱們須要調試咱們的代碼的時候,總不能每次都要部署到AWS服務器端吧,那麼這樣的效率很是低。所以咱們須要在本地調式完成後,咱們最後部署到咱們的AWS服務器上便可。node

1. 使用 Terminal調式webpack

咱們只須要在 invoke 後加 local 就能夠了,如命令:serverless invoke local -f hello -l   以下所示:
git

可是如上調式,也不是最好的方案,所以咱們須要使用工具調試就行了。爲了解決這個問題,在serverless中也有相似的工具。github

2. 使用工具調試web

2.1 安裝 serverless-offline 命令以下所示:npm

npm install serverless-offline -D

2.2 修改 serverless.ymlapi

咱們須要打開咱們的根目錄下的 serverless.yml, 添加以下配置信息:瀏覽器

events:
      - http:
          path: hello/{name}
          method: get
plugins:
  - serverless-offline

所以 serverless.yml 全部配置代碼以下:服務器

service: hello-world 
provider:
  name: aws
  runtime: nodejs10.x

functions:
  hello:
    handler: handler.hello
    events:
      - http:
          path: hello/{name}
          method: get
plugins:
  - serverless-offline

2.3 修改handler.js

如今咱們在handler.js 中添加以下代碼:

const {pathParameters = {}} = event;
const {name = 'xxx111'} = pathParameters;
const message = `您好,${ name }.`;

handler.js 的完整的代碼以下所示:

'use strict';

module.exports.hello = async (event, context, callback) => {
  
  console.log(event);
  console.log(context);

  const {pathParameters = {}} = event;
  const {name = 'xxx111'} = pathParameters;
  const message = `您好,${ name }.`;
  const html = `
    <html>
     <style>
      h2 {color:red;}
     </style>
     <body>
       <h1>第一個hello world 應用</h1>
       <h2>${message}</h2>
     </body>
    </html>`;
  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'text/html'
    },
    body: html
  }
};

如上代碼打印,咱們打印 console.log(event); 後,咱們打印的信息以下所示:

{ headers:
   { Host: 'localhost:3000',
     Connection: 'keep-alive',
     Pragma: 'no-cache',
     'Cache-Control': 'no-cache',
     'Upgrade-Insecure-Requests': '1',
     'User-Agent':
      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36',
     Accept:
      'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
     'Accept-Encoding': 'gzip, deflate, br',
     'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8' },
  multiValueHeaders:
   { Host: [ 'localhost:3000' ],
     Connection: [ 'keep-alive' ],
     Pragma: [ 'no-cache' ],
     'Cache-Control': [ 'no-cache' ],
     'Upgrade-Insecure-Requests': [ '1' ],
     'User-Agent':
      [ 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36' ],
     Accept:
      [ 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3' ],
     'Accept-Encoding': [ 'gzip, deflate, br' ],
     'Accept-Language': [ 'zh-CN,zh;q=0.9,en;q=0.8' ] },
  path: '/hello/2',
  pathParameters: { name: '2' },
  requestContext:
   { accountId: 'offlineContext_accountId',
     resourceId: 'offlineContext_resourceId',
     apiId: 'offlineContext_apiId',
     stage: 'dev',
     requestId: 'offlineContext_requestId_03349087551215857',
     identity:
      { cognitoIdentityPoolId: 'offlineContext_cognitoIdentityPoolId',
        accountId: 'offlineContext_accountId',
        cognitoIdentityId: 'offlineContext_cognitoIdentityId',
        caller: 'offlineContext_caller',
        apiKey: 'offlineContext_apiKey',
        sourceIp: '127.0.0.1',
        cognitoAuthenticationType: 'offlineContext_cognitoAuthenticationType',
        cognitoAuthenticationProvider: 'offlineContext_cognitoAuthenticationProvider',
        userArn: 'offlineContext_userArn',
        userAgent:
         'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36',
        user: 'offlineContext_user' },
     authorizer:
      { principalId: 'offlineContext_authorizer_principalId',
        claims: undefined },
     protocol: 'HTTP/1.1',
     resourcePath: '/hello/{name}',
     httpMethod: 'GET',
     requestTimeEpoch: 1561535723603 },
  resource: '/hello/{name}',
  httpMethod: 'GET',
  queryStringParameters: null,
  multiValueQueryStringParameters: null,
  stageVariables: null,
  body: null,
  isOffline: true }

而後咱們打印咱們的 console.log(context); 後,打印的信息以下所示:

{ done: [Function],
  fail: [Function: fail],
  succeed: [Function: succeed],
  getRemainingTimeInMillis: [Function: getRemainingTimeInMillis],
  awsRequestId: 'offline_awsRequestId_7749009079208731',
  clientContext: {},
  functionName: 'hello-world-dev-hello',
  functionVersion: 'offline_functionVersion_for_hello-world-dev-hello',
  identity: {},
  invokedFunctionArn: 'offline_invokedFunctionArn_for_hello-world-dev-hello',
  logGroupName: 'offline_logGroupName_for_hello-world-dev-hello',
  logStreamName: 'offline_logStreamName_for_hello-world-dev-hello',
  memoryLimitInMB: undefined }

2.4 啓動服務

如上配置代碼完成後,咱們能夠經過命令:sls offline 來運行了,若是啓動成功,咱們就會綁定3000端口了,以下所示:

這個時候,咱們在瀏覽器 http://localhost:3000/hello/2 訪問的時候,能夠看到以下信息了;以下所示:

當咱們把上面的地址改下的話,好比 http://localhost:3000/hello/kongzhi, 那麼頁面變成以下了,以下所示:

2.5 修改保存後自動加載代碼

咱們老是想盡一切辦法提高工做、開發效率,好比 webpack 和 nodemon 有 reload 的功能,固然 serverless-offline 也有。運行命令以下:

sls offline --useSeparateProcesses

以下所示:

如今當我修改了下 handler.js 代碼,而後會命令行中會自動打包,可是命令行中不會有任何提示,可是當咱們刷新頁面的時候,發現內容是最新的了以下所示:

github源碼查看

相關文章
相關標籤/搜索