Hi all,
I thought now was the time to go public. The automatic error propagation is
possible with the help of a simple Go package, and it has been about three
years now:
func CopyFile(src, dst string) (err error) {
defer err2.Returnf(&err, "copy %s %s", src, dst)
r := try.To1(os.Open(src))
defer r.Close()
w := try.To1(os.Create(dst))
defer err2.Handle(&err, func() {
_ = os.Remove(dst)
})
defer w.Close()
try.To1(io.Copy(w, r))
return nil
}
The playground <https://go.dev/play/p/bUGX8yDAeoL>.
A couple of blog posts about the subject:
- Error Propagation
<https://hackernoon.com/golang-more-error-handling-with-less-checking-eeh31go>
- Errors as Discriminated Unions
<https://hackernoon.com/billion-dollar-mistake-in-go-ll1s3tkc>
I'm the author of those posts and the err2 package
<https://github.com/lainio/err2>. Additional sources for original ideas are
mentioned in the blogs and the package documentation. And, of course, pure
error values are needed when transporting errors through channels.
I hope that any gopher who tries the err2 package finds it as valuable and
productive
as we have. Indeed, Go is one of the most pragmatic and refactor-friendly
native languages.
Best regards,
-Harri
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