On Mon, May 21, 2018 at 12:13 PM, <gopher.nut...@gmail.com> wrote:
> timeout := 1 * time.Millisecond
> select {
> case ch <-f(req):
> case <-time.After(timeout):
> ch <- errors.New("timeout")
> }
The instant 'select' is evaluated, ch is writable. Also time.After()
is called, and returns a channel that will be ready to be read in a
millisecond, i.e. not readable immediately. So it'll write to ch, and
will never timeout.
To do what you described, you need to run the request piece in a
goroutine, and write the result to a channel:
go func() {
_,err:=http.DefaultClient.Do(...)
ch<-err
}()
Then, wait for the error to arrive on ch, or timeout:
select {
case err:=<-ch:
case <-time.After(timeout):
}
> err:= <-ch
> close(ch)
> fmt.Println(err) // outputs <nil>, not timeout
> // Output:
> // timeout
> }
>
>
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