add error handling in go2cStr

[PiotrLewandowski323]

fixes #50

[coveralls]

Coverage: 74.438% (+0.7%) from 73.784% when pulling 4e3dd9a on PiotrLewandowski323:issue-50 into bce2fcc on roc-streaming:main.

[ortex]

LGTM. But, it would be great to add tests for endpoint, to cover new branches.

For sender and receiver there are separate issues

[gavv]

Minor comment: when we're forwarding error from go2cStr, like this:

	cIP, err := go2cStr(ip)
	if err != nil {
		return err
	}

it'd be nice to wrap the returned error and explain what string was invalid (otherwise it would be hard to guess for user). Like:

return fmt.Errorf("invalid ip: %w", err)

[PiotrLewandowski323]

The linux build in CI uses go 1.12 which doesn't support "%w" to wrap errors, so I had to replace it with "%v".

[gavv]

I think we can bump minimum go to 1.13 (in go mod and .github/workflows). The choice of 1.12 with rather arbitrary (it just was known to work on 1.12). On the other hand, I'd say %w is a very very useful feature for error handling.

[gavv]

Thanks for update! A couple more (I think final) comments.

[PiotrLewandowski323]

I rebased onto main because endpoint tests were refactored and updated the changes according to your comments.

[gavv]

Thanks!!