Aws 上的 Nestjs（无服务器框架）|如何访问事件参数？

Question

我正在AWS Lambda上托管一个Nestjs应用程序（使用无服务器框架）。请注意，实现在AWS API网关之后。

问题：如何访问Nest控制器中的事件参数？

这是我如何引导NestJS服务器的：

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;
};

以下是一个控制器中的功能:

@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< code>event参数，该参数在“普通”node 12.x Lambda函数中很容易访问:

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

解决方案：

在引导期间将 AwsExpress无服务器软件添加到您的设置中：

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

注意:< code>app.use应该在< code>app.init()之前

现在可以访问事件和上下文对象：

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

学分： SO上的这个答案