AWS Lambda Go函数在通过API GW调用时未获得请求正文

Question

首先，可以说这个问题非常类似于HTTP请求主体没有通过AWS API网关获得AWS lambda函数，或者通过API网关获得AWS lambda中的json主体

但是，这些问题都没有解决Golang的使用问题，我一直遇到的问题是找到一个与node.js文档中到处使用的event参数相当的参数。

下面是我的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)
}

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

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));
}

车身：

{"name":"Bob"}

Answer 1

结果是，即使我在面向用户的网站上找不到任何关于这方面的文档，文档确实存在。阅读：https://github.com/aws/aws-lambda-go/blob/master/events/readme_apigatewayevent.md

到目前为止，我想出了从API GW接收数据并响应请求的最简单的方法：

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)行将导致记录确切的请求正文。问题解决了。