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net: make cgo resolver work more accurately with network parameter

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Unlike the go resolver, the existing cgo resolver exchanges both DNS A
and AAAA RR queries unconditionally and causes unreasonable connection
setup latencies to applications using the cgo resolver.

This change adds new argument (`network`) in all functions through the
series of calls: from Resolver.internetAddrList to cgoLookupIPCNAME.

Benefit: no redundant DNS calls if certain IP version is used IPv4/IPv6
(no `AAAA` DNS requests if used tcp4, udp4, ip4 network. And vice
versa: no `A` DNS requests if used tcp6, udp6, ip6 network)

Fixes #25947

Change-Id: I39edbd726d82d6133fdada4d06cd90d401e7e669
Reviewed-on: https://go-review.googlesource.com/c/120215
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Eugene Kalinin 2018-06-21 01:23:37 +03:00 • committed by Brad Fitzpatrick
parent fc4f2e5692
commit c659be4dc8
15 changed files with 110 additions and 44 deletions
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4
src/net/dial_test.go
View file

@ -346,7 +346,7 @@ func TestDialParallel(t *testing.T) {
}
}
func lookupSlowFast(ctx context.Context, fn func(context.Context, string) ([]IPAddr, error), host string) ([]IPAddr, error) {
func lookupSlowFast(ctx context.Context, fn func(context.Context, string, string) ([]IPAddr, error), network, host string) ([]IPAddr, error) {
switch host {
case "slow6loopback4":
// Returns a slow IPv6 address, and a local IPv4 address.
@ -355,7 +355,7 @@ func lookupSlowFast(ctx context.Context, fn func(context.Context, string) ([]IPA
{IP: ParseIP("127.0.0.1")},
}, nil
default:
return fn(ctx, host)
return fn(ctx, network, host)
}
}