public async Task <IUpdateUserResult> Handle(UpdateUser request, CancellationToken cancellationToken)
{
var existingUser = await _mediator.Send(new GetUserById(request.UserId), cancellationToken);
return(existingUser switch
{
UserNotFound _ => UserNotFound.Instance,
UserFound userFound when IsNotMatchingETags(userFound.Etag, request.Etag) => new NewerVersionOfUserRecordFound(userFound.Etag),
UserFound userFound => await UpdateUser(request, userFound, cancellationToken),
_ => throw new ArgumentOutOfRangeException(nameof(existingUser))
});
public async Task <IActionResult> GetUser(Guid userId, [FromHeader(Name = "If-None-Match")] string etag)
{
var userResult = await _mediator.Send(new GetUserById(userId, etag));
var response = userResult switch
{
UserFound userFound => GetUserFoundResult(userFound),
UserNotModified _ => new StatusCodeResult((int)HttpStatusCode.NotModified),
UserNotFound _ => NotFound(),
_ => throw new ArgumentOutOfRangeException(nameof(userResult))
};
return(response);
IActionResult GetUserFoundResult(UserFound userFound)
{
var(errorMessage, userDto) = _mapper.MapTo <UserDto>(userFound.User);
if (!string.IsNullOrWhiteSpace(errorMessage))
{
throw new Exception(errorMessage);
}
return(new ObjectResult(ForExistingUser(userDto, userFound.Etag)));
}
}
