net: duplicated code of resolution of hosts in internetAddrList

[AlmogBaku]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

master

What did you do?

Resolver. internetAddrList() trying first to resolve the host as IPv4 then as IPv6 and only then to parse it with Resolver. LookupIPAddr(). Although, that's exactly what Resolver. LookupIPAddr() do anyway.

go/src/net/ipsock.go

Line 253 in d8a7990

if ip := parseIPv4(host); ip != nil {

What did you expect to see?

Resolver. internetAddrList() should reuse the code by resolving the host only by Resolver. LookupIPAddr()

[bradfitz]

/cc @mikioh

[mikioh]

I think it's fine to consolidate the code with the fix for #20790.

[gopherbot]

Change https://golang.org/cl/79935 mentions this issue: net: Parse IPv6 address with zone using DefaultResolver.Lookup{Host,IPAddr}