Abstract en(de)coder assertion code in bsoncodec

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    • Type: Spec Change
    • Resolution: Unresolved
    • Priority: Unknown
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    • Affects Version/s: None
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      There are multiple references to type asserting data in the bsoncodec package. For example:

      m, ok := val.Interface().(ValueUnmarshaler)
if !ok {
    // NB: this error should be unreachable due to the above checks
    return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val}
}

      and

      m, ok := val.Interface().(Unmarshaler)
if !ok {
    // NB: this error should be unreachable due to the above checks
    return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val}
}

      It would be helpful for readability and reuse to create a single function that handles all of this logic, something like the following:

      switch v := val.Interface().(type) {
case ValueUnmarshaler:
    // Handle ValueUnmarshaler case
    return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val}
case Unmarshaler:
    // Handle Unmarshaler case
    return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val}
default:
    // Handle the case when neither interface is implemented
    return vw.WriteNull()
}

            Assignee:
            Unassigned
            Reporter:
            Preston Vasquez
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              Created:
              Updated: