Handling dynamic JSON schema decoding-CodePudding

I have a Go HTTP client which sends/parses JSON-RPC requests.

HTTP POST Request :

[
   {"id":"1", "method":"action1","params":[]},
   {"id":"2", "method":"action2","params":[]},
   ...
   {"id":"X", "method":"actionX","params":[]}
]

HTTP response :

[
   {"id":"1", "error":null, "result":{...}},
   {"id":"2", "error":null, "result":{...}},
   ...
   {"id":"X", "error":null, "result":{...}}
]

How to handle those payloads where the result key is an object with dynamic schema depending on the value of the key id.

CodePudding user response：

You can instruct the json library not to unmarshal the result field by unmarshaling the result into a json.RawMessage, in this case unmarshal the response into a slice of:

type result struct{
    ID     string          `json:"id"`
    Err    *string         `json:"error"` // maybe a string?
    Result json.RawMessage `json:"result"`
}

Then when you know which ID you are dealing with you can unmarshal result.ID into another struct with the structure you expect.