AWS Lambda 上的 Nestjs（无服务器框架）|如何访问事件参数？

Question

我在 AWS Lambda 上托管一个 Nestjs 应用程序（使用无服务器框架）。请注意，实施在 AWS API 网关之后。

问题：如何访问 Nest controller 中的 event 参数？

这就是我 bootstrap NestJS 服务器的方式：

import { APIGatewayProxyHandler } from 'aws-lambda';
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { Server } from 'http';
import { ExpressAdapter } from '@nestjs/platform-express';
import * as awsServerlessExpress from 'aws-serverless-express';
import * as express from 'express';

let cachedServer: Server;

const bootstrapServer = async (): Promise<Server> => {
    const expressApp = express();
    const adapter = new ExpressAdapter(expressApp);
    const app = await NestFactory.create(AppModule, adapter);
    app.enableCors();
    await app.init();
    return awsServerlessExpress.createServer(expressApp);
}

export const handler: APIGatewayProxyHandler = async (event, context) => {
    if (!cachedServer) {
        cachedServer = await bootstrapServer()
    }
    return awsServerlessExpress.proxy(cachedServer, event, context, 'PROMISE')
        .promise;
};

这是一个控制器中的函数：

@Get()
getUsers(event) { // <-- HOW TO ACCESS event HERE?? This event is undefined.
    return {
        statusCode: 200,
        body: "This function works and returns this JSON as expected."
    }

我很难理解如何访问 event 参数，它在“正常”节点中很容易访问 12.x Lambda 函数：

module.exports.hello = async (event) => {
    return {
        statusCode: 200,
        body: 'In a normal Lambda, the event is easily accessible, but in NestJS its (apparently) not.'
    };
};

Answer 1

解法：

在 bootstrap 期间将 AwsExpressServerlessMiddleware 添加到您的设置中：

const awsServerlessExpressMiddleware = require('aws-serverless-express/middleware')
app.use(awsServerlessExpressMiddleware.eventContext())

注：app.use应该在之前app.init()

现在可以访问 event 和 context 对象：

var event = req.apiGateway.event;
var context = req.apiGateway.context;

制作人员：

AWS Lambda 上的 Nestjs（无服务器框架）|如何访问事件参数？

Nestjs on AWS Lambda (Serverless Framework) | How to access the event parameter?

amazon-web-services

node.js

serverless-framework

nestjs