如何使用AWS ApiGateway HttpApi调用lambda异步 [英] How to invoke lambda async with AWS ApiGateway HttpApi

问题描述

我正在使用AWS Api Gateway的新HTTP Api(于2019年12月推出).

I'm using the new HTTP Api (The one introduced in December 2019) of AWS Api Gateway.

我曾经使用过REST Api，通过添加X-Amz-Invocation-Type:Event标头，您可以异步触发lambda函数.

I used to work with REST Api, which lets you trigger lambda functions async by adding X-Amz-Invocation-Type:Event header.

新的HTTP Api不允许您指定标头，如何异步调用lambda函数?

The new HTTP Api does not let you specify that header, how can I call lambda functions asynchronously?

预先感谢

推荐答案

仅当集成为 Lambda和HTTP端点的代理集成，因此无法在API网关集成配置中设置X-Amz-Invocation-Type标头.

You can invoke a Lambda function asynchronously via API Gateway only if the integration is non-proxy. By default, HTTP APIs are designed to support only proxy integrations for Lambda and HTTP endpoints so it is not possible to set the X-Amz-Invocation-Type header in the API Gateway integration config.

为了通过HTTP API异步调用Lambda，您可以使用两个Lambda函数，其中一个充当实际函数的代理.

In order to invoke a Lambda asynchronously via HTTP API, you can use two Lambda functions with one acting as proxy to your actual function.

HTTP API->调用Lambda1 同步- ->调用Lambda2 异步

HTTP API --> Invoke Lambda1 synchronously --> Invoke Lambda2 asynchronously

下面是Lambda1异步调用Lambda2的示例NodeJS代码片段-

Below is a sample NodeJS code snippet for Lambda1 to invoke Lambda2 asynchronously -

const params = {
        FunctionName: 'FUNCTION_NAME',
        InvocationType: 'Event',
        Payload: JSON.parse(event.body) // this is the event coming from API Gateway to Lambda1
    };
await lambda.invoke(params).promise(); // await here is only going to wait for the HTTP request to be successful. Once Lambda2 is invoked, it will return immediately

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