How to handle erroneous API response to go?

Question

go

How to correctly handle an erroneous response received from the API?
For example, with a correct request, a correct json model is returned, let's call it User, which has a structure in Go:

type User struct {
  Country     string `json:"country"`
  Login       string `json:"login"`
  DisplayName string `json:"display_name"`
  UID         string `json:"uid"`
}

If the request is incorrect, the Error json model is returned, the structure in Go is:

type Error struct {
  Message     string `json:"message"`
  Description string `json:"description"`
  Error       string `json:"error"`
}

There is a function:

func (c *Client) GetUser(login string) (User,error) {
  // ..body
}

Which should return the User structure, but what to return in case of an error. I thought in the Error structure to implement the error interface and pass an erroneous response directly through error.

Answer 1

I thought in the Error structure to implement the error interface and pass an erroneous response directly through error.

Quite right.
So

func(e Error) Error() string{
    return e.Message
}

or so

type Error struct {
  Message     string `json:"message"`
  Description string `json:"description"`
  Error       string `json:"error"`
  error
}

Answer 2

func (c *Client) GetUser(login string) (*User,error) {
  
  // ...
  
  return nil, err
}