Hi Justin,
Got it - thanks much!
Hemant
On Saturday, September 29, 2018 at 11:58:30 PM UTC-4, Justin Israel wrote:
>
>
>
> On Sun, Sep 30, 2018 at 3:47 PM Hemant Singh <heman...@gmail.com
> <javascript:>> 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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