watchtower: rename SessionPrivKey to SessionKeyECDH

watchtower/wtclient/client.go

@@ -362,7 +362,7 @@ func getClientSessions(db DB, keyRing SecretKeyRing, forTower *wtdb.TowerID,
 		if err != nil {
 			return nil, err
 		}
-		s.SessionPrivKey = sessionKey
+		s.SessionKeyECDH = sessionKey
 
 		// If an optional filter was provided, use it to filter out any
 		// undesired sessions.

watchtower/wtclient/session_negotiator.go

@@ -428,7 +428,7 @@ func (n *sessionNegotiator) tryAddress(privKey *btcec.PrivateKey,
 				RewardPkScript: rewardPkScript,
 			},
 			Tower:          tower,
-			SessionPrivKey: privKey,
+			SessionKeyECDH: privKey,
 			ID:             sessionID,
 		}
 

watchtower/wtclient/session_queue.go

@@ -285,7 +285,7 @@ func (q *sessionQueue) sessionManager() {
 // drainBackups attempts to send all pending updates in the queue to the tower.
 func (q *sessionQueue) drainBackups() {
 	// First, check that we are able to dial this session's tower.
-	conn, err := q.cfg.Dial(q.cfg.ClientSession.SessionPrivKey, q.towerAddr)
+	conn, err := q.cfg.Dial(q.cfg.ClientSession.SessionKeyECDH, q.towerAddr)
 	if err != nil {
 		log.Errorf("SessionQueue(%s) unable to dial tower at %v: %v",
 			q.ID(), q.towerAddr, err)

watchtower/wtdb/client_session.go

@@ -60,12 +60,12 @@ type ClientSession struct {
 	// tower with TowerID.
 	Tower *Tower
 
-	// SessionPrivKey is the ephemeral secret key used to connect to the
-	// watchtower.
+	// SessionKeyECDH is the ECDH capable wrapper of the ephemeral secret
+	// key used to connect to the watchtower.
 	//
 	// NOTE: This value is not serialized. It is derived using the KeyIndex
 	// on startup to avoid storing private keys on disk.
-	SessionPrivKey *btcec.PrivateKey
+	SessionKeyECDH *btcec.PrivateKey
 }
 
 // ClientSessionBody represents the primary components of a ClientSession that