Read and work with errors

[rafi0101]

Hi. First of all I want to thank you for this project ;-)

I would like to know how to read your error messages and work with them.
The following scenario: I want to acquire a specific IP with AcquireSpecificIP() and it could be possible that this IP is already acquired, but that's ok. So I would like to read the error message like this

_, err = ipam.Ipamer.AcquireSpecificIP(ctx, prefix, ip)
if err != nil {
	if err == goipam.ErrAlreadyAllocated {
		log.Warnln("this is ok")
	} else {
		log.Errorln(err)
		return err
	}
}

But this does not work as expected, since I could see the error message is an assembled string. Can you tell me how to work with Variables and your error messages?

[majst01]

I guess you have to use (untested):

_, err = ipam.Ipamer.AcquireSpecificIP(ctx, prefix, ip)
if err != nil {
	if errors.Is(err, goipam.ErrAlreadyAllocated) {
		log.Warnln("this is ok")
	} else {
		log.Errorln(err)
		return err
	}
}

[rafi0101]

Yes, that is how it works 👍
Thanks for the quick reply