doulan8330
2019-06-11 06:46
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在AWS Lambda中使用GoLang解析JSON

As part of an application we are building, one of the process steps is an AWS Lamda that captures a post request does some work with it, and then moves one. It has an API Gateway Request as a trigger and the body of this request would be a JSON String. I am having trouble parsing the JSON String to GoLang Object. Here is what I have:

The function that catches request:

func HandleRequest(ctx context.Context, event events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {

  log.Print(fmt.Sprintf("body:[%s] ", event.Body))

  parseResponseStringToTypedObject(event.Body)

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

Then the parseResponseStringToTypedObject function :

func parseResponseStringToTypedObject(responseString string) {

  b := []byte(responseString)
  var resp SimpleType
  err := json.Unmarshal(b, &resp)

  if err == nil {
      log.Print(fmt.Sprintf("Account Name: [%s]", resp.accountName))
  } else {
      log.Print(fmt.Sprintf("Could not unmarshall JSON string: [%s]", err.Error()))
  }
}

Here is the SimpleType struct:

type SimpleType struct {
  accountName string `json:accountName`
  amount      int    `json:amount`
}

I then, as a test, posted this JSON Body via Postman: enter image description here

I opened up the CloudWatch Logs (where my lamda logs to) and see that the body is present in the event.Body property, and then logging out a field in the unmarshalled object (resp.accountName) I note that the field is blank. Why is this? Here is log output for the request:

enter image description here

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