• [AWS Lambda] Convert a Express node.js app to serverless


    Install new dependencies

    In a folder with the serverless project run the following commands to add new dependencies:

    npm install --save aws-serverless-express
    npm install --save express
    

    express - is a very popular Node.js web framework that we will use in this lesson aws-serverless-express - is a library that allows using express with AWS Lambda

    Import new dependencies

    In the getGroups.ts you need to import the following dependencies:

    import * as express from 'express'
    import * as awsServerlessExpress from 'aws-serverless-express'
    

    Create an Express instance

    Once the dependencies are imported you need to create an Express application:

    const app = express()
    

    Add a handler for a GET method

    To define how to process an incoming GET request, we need to use the app.get method and pass a function that will be called to process a request:

    app.get('/groups', async (_req, res) => {
      // TODO: get all groups as before
      const groups = ...
    
      // Return a list of groups
      res.json({
        items: groups
      })
    })
    

    You can read more about how to use Express here.

    To return a JSON response we use the .json() method on the response object.

    Export a Lambda handler

    Now the last thing that we need to do is to create a Lambda handler. To do this you can use the following code snippet:

    // Create Express server
    const server = awsServerlessExpress.createServer(app)
    // Pass API Gateway events to the Express server
    exports.handler = (event, context) => { awsServerlessExpress.proxy(server, event, context) }
    

     

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  • 原文地址:https://www.cnblogs.com/Answer1215/p/14922673.html
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