Retrofit + coroutines

NoteRemoteDataSource.kt

  override suspend fun notesByUser(
        userId: String
    ): OperationResult<List<Note>> {
        return try {
            val response = serviceApi.notesByUser(userId)
            val statusCode = response.code()
            //200 300 400
            if (response.isSuccessful) { //200
                val body: NotesResponse? = response.body()
                OperationResult.Success(body?.data?.map {
                    it.toNote()
                } ?: emptyList())
            } else {
                //response.code()
                val errorBody = response.errorBody()?.string()
                OperationResult.Failure(Exception(errorBody))
            }
        } catch (exception: Exception) {
            //500
            OperationResult.Failure(exception)
        }
    }