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或Getting json body in aws Lambda via API gateway非常相似但是，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event与 Node.js 文档中各处使用的参数等效的参数。这是我的 Lambda 函数：package mainimport (    "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：MyReturn从 API GW 调用时，对象未填充任何值。该行log.Print("Called by ", name)不会将任何内容附加到字符串Called by。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，完全相同的主体仍然有效。身体：{"name":"Bob"}

Answer 1

事实证明，即使我无法在面向用户的网站上找到任何关于此的文档，文档也确实存在。阅读： 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，该log.Print("Request body: ", name)行会记录准确的请求正文。问题解决了。

注意：我也不必APIGWResponse从问题中创建那个对象，这events.APIGatewayProxyResponse是完全一样的东西，已经为你做了。这些对象都在这个类里面： https: //github.com/aws/aws-lambda-go/blob/master/events/apigw.go