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Re: [Xen-devel] [PATCH 6/9] golang/xenlight: Errors are negative


  • To: Nick Rosbrook <rosbrookn@xxxxxxxxx>
  • From: George Dunlap <george.dunlap@xxxxxxxxxx>
  • Date: Thu, 16 Jan 2020 16:59:46 +0000
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  • Cc: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 16 Jan 2020 17:00:03 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 1/4/20 7:27 PM, Nick Rosbrook wrote:
> On Fri, Dec 27, 2019 at 11:33 AM George Dunlap <george.dunlap@xxxxxxxxxx> 
> wrote:
>>
>> Commit 871e51d2d4 changed the sign on the xenlight error types (making
>> the values negative, same as the C-generated constants), but failed to
>> flip the sign in the Error() string function.  The result is that
>> ErrorNonspecific.String() prints "libxl error: 1" rather than the
>> human-readable error message.
> 
> Since we're here, what would you think about re-defining libxlErrors
> as a map[Error]string? That way, Error() can just be:
> 
> func (e Error) Error() string {
>         if s, ok := libxlErrors[e]; ok {
>                 return s
>         }
> 
>         return fmt.Sprintf("libxl error: %d", e)
> }
> 
> I think it's less error-prone and easier to read. Thoughts?

Yes, that sounds better.  Done.

 -George

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