[Twisted-Python] IPv6 comparison handling

[Glyph]

> On Apr 24, 2016, at 12:21 PM, Maciej Wasilak <wasilak at gmail.com> wrote:
> 
> Hello,
> 
> In my UDP Twisted based library there is a problem with IPv6 addresses
> representation. Addresses are compared as simple strings, and it
> sometimes causes mismatches:
> 
> "fe80::aaaa:bbff:fecc:dddd" should be equal to
> "fe80:0000:0000:0000:aaaa:bbff:fecc:dddd"
> 
> I've noticed that Python 3 has nice new module "ipaddress" exactly for
> this kind of problems, and it has been backported to Python 2.7.
> Before I add it as a new dependency I wanted to ask if maybe Twisted
> has some other suggested solution for this problem?

You should probably use ipaddress.  Twisted's facilities in this area are somewhat primitive, and should be improved; particularly, you _should_ be able to do:

a = IPv6Address("UDP", "fe80::", 0)
b = IPv6Address("UDP", "fe80::00:00", 0)
a == b

but right now that doesn't work.

A patch that fixes it would be much appreciated though!

-glyph