lnwire: introduce new NetAddress struct for p2p node addr+key info

lnwire/netaddress.go

@@ -0,0 +1,33 @@
+package lnwire
+
+import (
+	"net"
+
+	"github.com/roasbeef/btcd/btcec"
+)
+
+// ServiceFlag identifies the services supported by a particular Lightning
+// Network peer.
+type ServiceFlag uint64
+
+// NetAddress represents information pertaining to the identity and network
+// reachability of a peer. Information stored includes the node's identity
+// public key for establishing a confidential+authenticated connection, the
+// service bits it supports, and a TCP address the node is reachable at.
+//
+// TODO(roasbeef): merge with LinkNode in some fashion
+type NetAddress struct {
+	// IdentityKey is the long-term static public key for a node. This node is
+	// used throughout the network as a node's identity key. It is used to
+	// authenticate any data sent to the network on behalf of the node, and
+	// additionally to establish a confidential+authenticated connection with
+	// the node.
+	IdentityKey *btcec.PublicKey
+
+	// Services defines the set of services supported by the node reachable at
+	// the address and identity key defined in the struct.
+	Services ServiceFlag
+
+	// Address is is the IP address and port of the node.
+	Address *net.TCPAddr
+}