dtest84004
2018-02-16 17:18
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Go如何反序列化混合类型的JSON数组

I'm writing a go client for aigaming.com, and when I make an invalid request the response will include some error information. I want to capture this response with a struct, however, I run into trouble when the types begin to mix.

The JSON structure of the error data looks like this:

{  
   "errorMessage":"An error occurred (ValidationException) when calling the Query operation: ExpressionAttributeValues contains invalid value: One or more parameter values were invalid: An AttributeValue may not contain an empty string for key :v0",
   "errorType":"ClientError",
   "stackTrace":[  
      [  
         "/var/task/OfferGame.py",
         612,
         "lambda_handler",
         "game = offerGame.createOffer()"
      ],
      [  
         "/var/task/OfferGame.py",
         586,
         "createOffer",
         "gameRow = self.findSuitableWaitingGame()"
      ],
      [  
         "/var/task/OfferGame.py",
         503,
         "findSuitableWaitingGame",
         "Key('GameStyleId_GameStatus').eq(str(self.gameStyleId) + '_' + self.Game.KEY_GAME_STATUS_WAITING)"
      ]
      // There are more items, but I'll omit them for brevity
   ]
}

This is mostly trivial to capture, however, the trouble comes with the stackTrace items. It is an array, of arrays, of mixed types.

The best results I've had so far are with this struct. It doesn't actually give me any data (all the elements are empty), but it comes back with the correct number of elements and nested elements to have.

type ErrorResponse struct {
    ErrorMessage string          `json:"errorMessage"`
    ErrorType    string          `json:"errorType"`
    StackTrace   [][]interface{} `json:"stackTrace"`
}

Is there a way to parse these items of mixed type? Can I possibly work around this by somehow forcing all the integer elements to be treated as strings instead?

UPDATE: Here is what I mean by "empty". The correct number of things are there, but they do not appear to be initialized. enter image description here

图片转代码服务由CSDN问答提供 功能建议

我正在为 aigaming.com ,当我发出无效请求时,响应将包含一些错误信息。 我想用 struct 捕获此响应,但是,当类型开始混合时,我就遇到了麻烦。

错误数据的JSON结构看起来像 此:

  {
“ errorMessage”:“调用查询操作时发生错误(ValidationException):ExpressionAttributeValues包含无效值:一个或多个参数值无效:An  AttributeValue可能不包含密钥的空字符串:v0“,
” errorType“:” ClientError“,
” stackTrace“:[
 [
” /var/task/OfferGame.py",
 612,  
“ lambda_handler”,
“游戏= offerGame.createOffer()” 
],
 [
“ /var/task/OfferGame.py",
 586,
” createOffer“,
”  gameRow = self.findSuitableWaitingGame()“ 
],
 [
” /var/task/OfferGame.py",
 503,
“ findSuitableWaitingGame”,
“ Key('GameStyleId_GameStatus')。eq(  str(self.gameStyleId)+'_'+ self.Game.KEY_GAME_STATUS_WA  ITING)“ 
] 
 //还有更多项目,为简洁起见,我会省略它们
] 
} 
   
 
 

这通常很简单 但是,麻烦在于 stackTrace 项。 它是混合类型的数组。

到目前为止,我获得的最佳结果是使用此结构。 它实际上并没有提供任何数据(所有元素都是空的),但返回的元素和嵌套元素的数量正确。

 类型ErrorResponse结构 {
 ErrorMessage字符串`json:“ errorMessage”`
 ErrorType字符串`json:“ errorType”`
 StackTrace [] [] interface {}`json:“ stackTrace”`
} 
  <  / pre> 
 
 

是否可以解析这些混合类型的项目? 我可以通过某种方式强制将所有整数元素改为字符串来解决此问题吗?

UPDATE: 这里是“空”的意思。 正确数量的东西在那里,但是它们似乎没有被初始化。 “在此处输入图片描述”

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2条回答 默认 最新

  • doudianhuo1129 2018-02-16 17:26
    已采纳

    You're on the right track, just continue. Whenever you need something from StackTrace, use type assertions and execute code according to the actual type. Do note that type assertions return 2 values, check the second one to see whether the assumed type is correct or not.

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  • doucha5080 2018-02-16 17:40

    Unmarshal json into generic interface

    jsonstr := []byte(`{  
                    "errorMessage":"An error occurred (ValidationException) when calling the Query operation: ExpressionAttributeValues contains invalid value: One or more parameter values were invalid: An AttributeValue may not contain an empty string for key :v0",
                    "errorType":"ClientError",
                    "stackTrace":[  
                        [  
                            "/var/task/OfferGame.py",
                            612,
                            "lambda_handler",
                            "game = offerGame.createOffer()"
                        ],
                        [  
                            "/var/task/OfferGame.py",
                            586,
                            "createOffer",
                            "gameRow = self.findSuitableWaitingGame()"
                        ],
                        [  
                            "/var/task/OfferGame.py",
                            503,
                            "findSuitableWaitingGame",
                            "Key('GameStyleId_GameStatus').eq(str(self.gameStyleId) + '_' + self.Game.KEY_GAME_STATUS_WAITING)"
                        ]
                    ]
                }`)
    
        var dat interface{}
        if err := json.Unmarshal(jsonstr, &dat); err != nil {
            panic(err)
        }
    

    Loop through underlying map[string]interface{}

    for _, value := range dat.(interface{}).(map[string]interface{}){
        switch tt := value.(type){
        case string:
            fmt.Printf("type is string", tt)
        case float64:
            fmt.Printf("type is float64", tt)
        case bool:
            fmt.Printf("type is boolean", tt)
        case interface{}:
            fmt.Printf("type is interface{}", tt)
        default:
            fmt.Printf("type is unknown", tt)
    
        }
    }
    

    Finally using switch you can check the type of value which you can get using type assertion.

    check the code on go playground

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