remove AddressFamily.Either()

common/net/address.go

@@ -35,16 +35,6 @@ const (
 	AddressFamilyDomain = AddressFamily(2)
 )
 
-// Either returns true if current AddressFamily matches any of the AddressFamilies provided.
-func (af AddressFamily) Either(fs ...AddressFamily) bool {
-	for _, f := range fs {
-		if af == f {
-			return true
-		}
-	}
-	return false
-}
-
 // IsIPv4 returns true if current AddressFamily is IPv4.
 func (af AddressFamily) IsIPv4() bool {
 	return af == AddressFamilyIPv4
@@ -55,6 +45,11 @@ func (af AddressFamily) IsIPv6() bool {
 	return af == AddressFamilyIPv6
 }
 
+// IsIP returns true if current AddressFamily is IPv6 or IPv4.
+func (af AddressFamily) IsIP() bool {
+	return af == AddressFamilyIPv4 || af == AddressFamilyIPv6
+}
+
 // IsDomain returns true if current AddressFamily is Domain.
 func (af AddressFamily) IsDomain() bool {
 	return af == AddressFamilyDomain

common/protocol/address.go

@@ -213,7 +213,7 @@ func (p *addressParser) readAddress(b *buf.Buffer, reader io.Reader) (net.Addres
 		domain := string(b.BytesFrom(-domainLength))
 		if maybeIPPrefix(domain[0]) {
 			addr := net.ParseAddress(domain)
-			if addr.Family().IsIPv4() || addr.Family().IsIPv6() {
+			if addr.Family().IsIP() {
 				return addr, nil
 			}
 		}