go - 通过 API GW 调用时，AWS Lambda Go 函数未获取请求正文

Question

首先，有人可能会说这个问题与HTTP request body not getting to AWS lambda function via AWS API Gateway 非常相似。或 Getting json body in aws Lambda via API gateway

但是，这些问题都没有解决使用 Golang 的问题，我一直遇到的问题是找到 Node.js 文档中随处使用的 event 参数的等效项。

这是我的 Lambda 函数:

package main

import (
    "context"
    "encoding/json"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/aws/aws-lambda-go/events"
    "log"
)

type MyReturn struct {
    Response string `json:"response"`
}

type APIGWResponse struct {
    IsBase64Encoded bool              `json:"isBase64Encoded"`
    StatusCode      int               `json:"statusCode"`
    Headers         map[string]string `json:"headers"`
    Body            string            `json:"body"`
}

func handle(ctx context.Context, name MyReturn) (APIGWResponse, error) {
    log.Print("Called by ", name)
    log.Print("context ", ctx)
    headers := map[string]string{"Access-Control-Allow-Origin": "*", "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"}

    code := 200
    response, error := json.Marshal(myReturn{Response:"Hello, " + name.Body})
    if error != nil {
        log.Println(error)
        response = []byte("Internal Server Error")
        code = 500
    }

    return APIGWResponse{true, code, headers, string(response)}, nil
}

func main() {
    lambda.Start(handle)
}

问题:从 API GW 调用时，MyReturn 对象未填充任何值。 log.Print("Called by ", name) 行不会将任何内容附加到 Called by 字符串。

请求 API GW:

 POST -> body: '{"name":"Bob"}', headers: {'Content-Type': 'application/json'}

这是在纯 JS 中执行的，如下所示:

const BASE_URL = "https://my_api_id.execute-api.us-east-1.amazonaws.com/prod/";
const TRIGGER_URL = "my_lambda_function";

function toGW() {
    fetch(BASE_URL + TRIGGER_URL, {
        method: 'POST',
        body: '{"name":"Bimesh"}',
        headers:{
            'Content-Type': 'application/json'
        }
    })
    .then(data => data.json())
    .then(json => console.log(json))
    .catch(error => console.log(error));
}

然而，当从 AWS Lambda 控制台对其进行测试时，完全相同的主体可以正常工作。

正文:

{"name":"Bob"}

Answer 1

事实证明，即使我无法在面向用户的网站上找到关于此的任何文档，文档也确实存在。读这个:https://github.com/aws/aws-lambda-go/blob/master/events/README_ApiGatewayEvent.md

这是迄今为止我想出的从 API GW 接收数据和响应请求的最简单方法:

package main

import (
    "context"
    "encoding/json"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/aws/aws-lambda-go/events"
    "log"
)

type myReturn struct {
    Response string `json:"response"`
}

func handle(ctx context.Context, name events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    log.Print("Request body: ", name)
    log.Print("context ", ctx)
    headers := map[string]string{"Access-Control-Allow-Origin": "*", "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"}

    code := 200
    response, error := json.Marshal(myReturn{Response:"Hello, " + name.Body})
    if error != nil {
        log.Println(error)
        response = []byte("Internal Server Error")
        code = 500
    }

    return events.APIGatewayProxyResponse {code, headers, string(response), false}, nil
}

func main() {
    lambda.Start(handle)
}

在这种情况下，log.Print("Request body: ", name) 行导致记录准确的请求主体。问题解决了。

注意:此外，我不必根据问题创建 APIGWResponse 对象，events.APIGatewayProxyResponse 是完全相同的东西，已经为您准备好了。这些对象都在这个类中:https://github.com/aws/aws-lambda-go/blob/master/events/apigw.go