On Sun, Sep 30, 2018 at 3:47 PM Hemant Singh <hemanti...@gmail.com> wrote:
> I have a question. I have changed the open goping.go code to return error
> from functions.
>
> The following function is implemented in a .goping.go file.
>
> func ping(config *Config, address, name string, pattern *regexp.Regexp)
> error { }
>
> Another function shown below, in the same .go file, calls 'go ping()'. As
> one can see above, the ping function returns an error. How do I change the
> 'go ping()' code below to grab the error returned from calling ping()? I
> could also use a URL to where a description exists for using 'go
> function_call' inside a Go program.
>
> func ping_main(address string) error {
> go ping(config, address, "DstIP", LATENCY_PATTERN)
> }
>
In this current form, it is not possible to grab the error because you are
not waiting on the ping() to finish when you call it asynchronously in a
goroutine. If you need the error, the most obvious thing to do is to call
it in a blocking fashion:
func ping_main(address string) error {
return ping(config, address, "DstIP", LATENCY_PATTERN)
}
But if you need to call it in a non-blocking way, then you have to arrange
a way to receive the error value later once the ping is complete. Wrapping
the existing ping() function might be a way to go:
func ping_main(address string) <-chan error {
err := make(chan error, 1)
go func() {
err <- ping(config, address, "DstIP", LATENCY_PATTERN)
}()
return err
}
This means the ping still runs in a non-blocking way, but will report the
return value when it is complete.
>
> Best,
>
> Hemant
>
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