dongliao1949
2018-06-12 07:49
浏览 103
已采纳

在AWS上测试Lambda函数时遇到问题

I have been trying to get my first lambda function in Go running via the Amazon API Gateway.

I have the following package set up in go. The goal is to send a JSON request and log and return the body of that request:

package main

import (
    "net/http"
    "log"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/aws/aws-lambda-go/events"
)

func Handler(request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {

    //These log statements return empty regardless of JSON input.
    log.Print(request.body)

    return events.APIGatewayProxyResponse{
        StatusCode: http.StatusOK,
        Body: request.Body
    }, nil
}

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

I can build and zip this and upload it to the AWS lambda manager. The AWS lambda manager contains an option to use a test event which I can configure with a JSON string

{
  "testint": 1,
  "teststring": "test"
}

However, if I run this test, I get the following result:

{
  "statusCode": 200,
  "headers": null,
  "body": ""
}

I would expect the body to actually contain the json I passed to the function, but clearly something is going wrong.

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我一直试图通过Amazon API Gateway运行Go中的第一个lambda函数。 \ n

我正在安装以下软件包。 目标是发送JSON请求并记录并返回该请求的正文:

 包main 
 
import(
“ net / http” 
“ log  “ 
” github.com/aws/aws-lambda-go/lambda"
“ github.com/aws/aws-lambda-go/events"
)

func Handler(request events.APIGatewayProxyRequest)(  events.APIGatewayProxyResponse,error){
 
 //无论JSON输入如何,这些日志语句都返回空。
 log.Print(request.body)
 
返回事件。APIGatewayProxyResponse{
 StatusCode:http.StatusOK,  
正文:request.Body 
},nil 
} 
 
func main(){
 lambda.Start(Handler)
} 
   
 
 

我可以构建并压缩它,然后将其上传到AWS lambda管理器。 AWS lambda管理器包含一个选项,该选项可以使用测试事件,可以使用JSON字符串对其进行配置

  {
“ testint”:1,
“ teststring”:“ test” 
} 
   
 
 

但是,如果我运行此测试,则会得到 以下结果:

  {
“ statusCode”:200,
“ headers”:null,  
“ body”:“” 
} 
   
 
 

我希望正文实际上包含我传递给函数的json,但显然出了点问题

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1条回答 默认 最新

  • dongyuan1984 2018-06-20 19:23
    已采纳

    There's a few minor things I changed and then it works

    First, log.Print(request.body) doesn't compile for me, but using request.Body is fine

    Second, the type you are using for the request is

    // APIGatewayProxyRequest contains data coming from the API Gateway proxy
    type APIGatewayProxyRequest struct {
        Resource              string                        `json:"resource"` // The resource path defined in API Gateway
        Path                  string                        `json:"path"`     // The url path for the caller
        HTTPMethod            string                        `json:"httpMethod"`
        Headers               map[string]string             `json:"headers"`
        QueryStringParameters map[string]string             `json:"queryStringParameters"`
        PathParameters        map[string]string             `json:"pathParameters"`
        StageVariables        map[string]string             `json:"stageVariables"`
        RequestContext        APIGatewayProxyRequestContext `json:"requestContext"`
        Body                  string                        `json:"body"`
        IsBase64Encoded       bool                          `json:"isBase64Encoded,omitempty"`
    }
    

    and in this Body is a field "body" that's a string. So altering your test data to

    {
      "body": "HELLO"
    
    }
    

    will give some data that passes through

    Lastly, the parameters for the Handler in all the examples seems to include a context object, so I added that

    func Handler(ctx context.Context, request events.APIGatewayProxyRequest) 
    

    Here is a complete version of your program that "worked for me"

    package main
    
    import (
        "context"
        "github.com/aws/aws-lambda-go/events"
        "github.com/aws/aws-lambda-go/lambda"
        "log"
        "net/http"
    )
    
    func Handler(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    
        //These log statements return empty regardless of JSON input.
        log.Print(request.Body)
    
        return events.APIGatewayProxyResponse{
            StatusCode: http.StatusOK,
            Body:       request.Body}, nil
    }
    
    func main() {
        lambda.Start(Handler)
    }
    
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