[#31] network: Make the address a separate type

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/network/address.go

@@ -6,7 +6,22 @@ import (
 
 // Address represents the NeoFS node
 // network address.
-//
-// It is a type alias of
-// github.com/multiformats/go-multiaddr.Multiaddr.
-type Address = multiaddr.Multiaddr
+type Address struct {
+	ma multiaddr.Multiaddr
+}
+
+func (a Address) String() string {
+	return a.ma.String()
+}
+
+// AddressFromString restores address from a string representation.
+func AddressFromString(s string) (*Address, error) {
+	ma, err := multiaddr.NewMultiaddr(s)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Address{
+		ma: ma,
+	}, nil
+}

pkg/network/listen.go

@@ -3,11 +3,12 @@ package network
 import (
 	"net"
 
+	"github.com/multiformats/go-multiaddr"
 	manet "github.com/multiformats/go-multiaddr-net"
 )
 
 // Listen announces on the local network address.
-func Listen(addr Address) (net.Listener, error) {
+func Listen(addr multiaddr.Multiaddr) (net.Listener, error) {
 	mLis, err := manet.Listen(addr)
 	if err != nil {
 		return nil, err