On Wednesday, February 7, 2018 at 1:26:46 AM UTC-5, Tamás Gulácsi wrote:
>
> backend.FilterIPs should return differentiable error - whether this is a
> transient or a permanent error.
> I'd use github.com/pkg/errors:
>
> var ErrTransient = errors.New("transient error")
>
>
Nice, thanks.. this is along the lines of what i was thinking I needed to
do. There's a slight complication.. Maybe this is a better example:
https://play.golang.org/p/y_zo_RfL5Dr
it creates a gzipped buffer, truncates it slightly so the read fails, and
then tries copying it to dev null. io.Copy returns: "unexpected EOF"
Is there some way to inspect that error to figure out that it was related
to reading from 'gr' and not writing to /dev/null?
In this example I would want errors related to the reader to be wrapped as
transient and errors related to the writer to be fatal, but there's a bit
of a catch-22 in that I don't know how to tell which I have so I can
properly wrap the error.
Checking for exactly ErrUnexpectedEOF could work in this exact case, but
would miss others like gzip.ErrChecksum .
In my head I need something like
if err.(???).ReadWriter() == gr { # error related to the reader,
transient.
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