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Sample AWS Lambda function exposing the same business logic using the Amazon API Gateway of the Node.js Express framework.
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| "use strict"; | |
| console.log('Loading function'); | |
| // Your business logic | |
| function greetingsFor(name) { | |
| console.log('name: ', name); | |
| if ((name == undefined) || (name == '')) { | |
| name = 'World'; | |
| } | |
| const greetings = 'Hello ' + name + '!'; | |
| console.log('greetings: ', greetings); | |
| return greetings; | |
| } | |
| // Event wrapper for Amazon API Gateway | |
| exports.handler = async (event, context) => { | |
| function buildResponse(message) { | |
| const responseCode = 200; | |
| const responseBody = { | |
| message: message | |
| }; | |
| const response = { | |
| statusCode: responseCode, | |
| headers: { | |
| 'x-custom-header' : 'my custom header value' | |
| }, | |
| body: JSON.stringify(responseBody) | |
| }; | |
| console.log('response: ' + JSON.stringify(response)) | |
| return response; | |
| } | |
| console.log('request: ' + JSON.stringify(event)); | |
| let name; // default value is undefined | |
| if (event.queryStringParameters != null) { | |
| name = event.queryStringParameters.name; | |
| } | |
| return buildResponse(greetingsFor(name)); | |
| }; | |
| // If not running on AWS Lambda, use Express | |
| if (!(process.env.LAMBDA_TASK_ROOT && process.env.AWS_EXECUTION_ENV)) { | |
| const express = require('express') | |
| const app = express() | |
| app.get('/', function (req, res) { | |
| res.send(greetingsFor(req.query.name)); | |
| }) | |
| app.listen(process.env.PORT || 3000) | |
| } |
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