From 1ae802812cd7a4968eacc9d52e3a4fedf31d1350 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Thu, 30 Nov 2023 11:31:04 +0200
Subject: [PATCH 01/18] watchtower: update DeleteCommittedUpdate to delete all

This commit updates the DeleteCommittedUpdate DB method to delete all of
a given session's committed updates instead of just one at a time. The
reason for this is that in an upcoming commit, we will introduce a
"Terminal" session state - once we have deleted a committed update for a
session it should be considered "Terminal" and there is never a case
where we would only want to delete one committed update and not the
rest. So we want these two actions (deleting committed updates of a
session and setting it's status to terminal) to be atomic.
---
 watchtower/wtclient/interface.go     |  6 +--
 watchtower/wtclient/session_queue.go |  9 ++--
 watchtower/wtdb/client_db.go         | 72 +++++++++++++++++-----------
 watchtower/wtdb/client_db_test.go    | 19 ++------
 4 files changed, 55 insertions(+), 51 deletions(-)

diff --git a/watchtower/wtclient/interface.go b/watchtower/wtclient/interface.go
index e69155288..c1d71c0e7 100644
--- a/watchtower/wtclient/interface.go
+++ b/watchtower/wtclient/interface.go
@@ -136,9 +136,9 @@ type DB interface {
 	// space.
 	GetDBQueue(namespace []byte) wtdb.Queue[*wtdb.BackupID]
 
-	// DeleteCommittedUpdate deletes the committed update belonging to the
-	// given session and with the given sequence number from the db.
-	DeleteCommittedUpdate(id *wtdb.SessionID, seqNum uint16) error
+	// DeleteCommittedUpdates deletes all the committed updates belonging to
+	// the given session from the db.
+	DeleteCommittedUpdates(id *wtdb.SessionID) error
 }
 
 // AuthDialer connects to a remote node using an authenticated transport, such
diff --git a/watchtower/wtclient/session_queue.go b/watchtower/wtclient/session_queue.go
index 1bd7a4ddb..3c1126a89 100644
--- a/watchtower/wtclient/session_queue.go
+++ b/watchtower/wtclient/session_queue.go
@@ -211,14 +211,13 @@ func (q *sessionQueue) Stop(final bool) error {
 					update.BackupID, err)
 				continue
 			}
+		}
 
-			err = q.cfg.DB.DeleteCommittedUpdate(
-				q.ID(), update.SeqNum,
-			)
+		if final {
+			err = q.cfg.DB.DeleteCommittedUpdates(q.ID())
 			if err != nil {
 				log.Errorf("could not delete committed "+
-					"update %d for session %s",
-					update.SeqNum, q.ID())
+					"updates for session %s", q.ID())
 			}
 		}
 
diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index 3a8eb6725..46b3e73f5 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -196,9 +196,9 @@ var (
 	// session has updates for channels that are still open.
 	errSessionHasOpenChannels = errors.New("session has open channels")
 
-	// errSessionHasUnackedUpdates is an error used to indicate that a
+	// ErrSessionHasUnackedUpdates is an error used to indicate that a
 	// session has un-acked updates.
-	errSessionHasUnackedUpdates = errors.New("session has un-acked updates")
+	ErrSessionHasUnackedUpdates = errors.New("session has un-acked updates")
 
 	// errChannelHasMoreSessions is an error used to indicate that a channel
 	// has updates in other non-closed sessions.
@@ -1798,22 +1798,21 @@ func isSessionClosable(sessionsBkt, chanDetailsBkt, chanIDIndexBkt kvdb.RBucket,
 		return false, ErrSessionNotFound
 	}
 
+	// Since the DeleteCommittedUpdates method deletes the cSessionCommits
+	// bucket in one go, it is possible for the session to be closable even
+	// if this bucket no longer exists.
 	commitsBkt := sessBkt.NestedReadBucket(cSessionCommits)
-	if commitsBkt == nil {
-		// If the session has no cSessionCommits bucket then we can be
-		// sure that no updates have ever been committed to the session
-		// and so it is not yet exhausted.
-		return false, nil
-	}
-
-	// If the session has any un-acked updates, then it is not yet closable.
-	err := commitsBkt.ForEach(func(_, _ []byte) error {
-		return errSessionHasUnackedUpdates
-	})
-	if errors.Is(err, errSessionHasUnackedUpdates) {
-		return false, nil
-	} else if err != nil {
-		return false, err
+	if commitsBkt != nil {
+		// If the session has any un-acked updates, then it is not yet
+		// closable.
+		err := commitsBkt.ForEach(func(_, _ []byte) error {
+			return ErrSessionHasUnackedUpdates
+		})
+		if errors.Is(err, ErrSessionHasUnackedUpdates) {
+			return false, nil
+		} else if err != nil {
+			return false, err
+		}
 	}
 
 	session, err := getClientSessionBody(sessionsBkt, id[:])
@@ -2215,9 +2214,9 @@ func (c *ClientDB) GetDBQueue(namespace []byte) Queue[*BackupID] {
 	)
 }
 
-// DeleteCommittedUpdate deletes the committed update with the given sequence
-// number from the given session.
-func (c *ClientDB) DeleteCommittedUpdate(id *SessionID, seqNum uint16) error {
+// DeleteCommittedUpdates deletes all the committed updates for the given
+// session.
+func (c *ClientDB) DeleteCommittedUpdates(id *SessionID) error {
 	return kvdb.Update(c.db, func(tx kvdb.RwTx) error {
 		sessions := tx.ReadWriteBucket(cSessionBkt)
 		if sessions == nil {
@@ -2231,23 +2230,40 @@ func (c *ClientDB) DeleteCommittedUpdate(id *SessionID, seqNum uint16) error {
 		}
 
 		// If the commits sub-bucket doesn't exist, there can't possibly
-		// be a corresponding update to remove.
+		// be corresponding updates to remove.
 		sessionCommits := sessionBkt.NestedReadWriteBucket(
 			cSessionCommits,
 		)
 		if sessionCommits == nil {
-			return ErrCommittedUpdateNotFound
+			return nil
 		}
 
-		var seqNumBuf [2]byte
-		byteOrder.PutUint16(seqNumBuf[:], seqNum)
+		// errFoundUpdates is an error we will use to exit early from
+		// the ForEach loop. The return of this error means that at
+		// least one committed update exists.
+		var errFoundUpdates = fmt.Errorf("found committed updates")
+		err := sessionCommits.ForEach(func(k, v []byte) error {
+			return errFoundUpdates
+		})
+		switch {
+		// If the errFoundUpdates signal error was returned then there
+		// are some updates that need to be deleted.
+		case errors.Is(err, errFoundUpdates):
 
-		if sessionCommits.Get(seqNumBuf[:]) == nil {
-			return ErrCommittedUpdateNotFound
+		// If no error is returned then the ForEach call back was never
+		// entered meaning that there are no un-acked committed updates.
+		// So we can exit now as there is nothing left to do.
+		case err == nil:
+			return nil
+
+		// If an expected error is returned, return that error.
+		default:
+			return err
 		}
 
-		// Remove the corresponding committed update.
-		return sessionCommits.Delete(seqNumBuf[:])
+		// Delete all the committed updates in one go by deleting the
+		// session commits bucket.
+		return sessionBkt.DeleteNestedBucket(cSessionCommits)
 	}, func() {})
 }
 
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 9348b845f..475b72837 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -194,12 +194,12 @@ func (h *clientDBHarness) ackUpdate(id *wtdb.SessionID, seqNum uint16,
 	require.ErrorIs(h.t, err, expErr)
 }
 
-func (h *clientDBHarness) deleteCommittedUpdate(id *wtdb.SessionID,
-	seqNum uint16, expErr error) {
+func (h *clientDBHarness) deleteCommittedUpdates(id *wtdb.SessionID,
+	expErr error) {
 
 	h.t.Helper()
 
-	err := h.db.DeleteCommittedUpdate(id, seqNum)
+	err := h.db.DeleteCommittedUpdates(id)
 	require.ErrorIs(h.t, err, expErr)
 }
 
@@ -660,18 +660,7 @@ func testCommitUpdate(h *clientDBHarness) {
 
 	// We will now also test that the DeleteCommittedUpdates method also
 	// works.
-	// First, try to delete a committed update that does not exist.
-	h.deleteCommittedUpdate(
-		&session.ID, update4.SeqNum, wtdb.ErrCommittedUpdateNotFound,
-	)
-
-	// Now delete an existing committed update and ensure that it succeeds.
-	h.deleteCommittedUpdate(&session.ID, update1.SeqNum, nil)
-	h.assertUpdates(session.ID, []wtdb.CommittedUpdate{
-		*update2,
-	}, nil)
-
-	h.deleteCommittedUpdate(&session.ID, update2.SeqNum, nil)
+	h.deleteCommittedUpdates(&session.ID, nil)
 	h.assertUpdates(session.ID, []wtdb.CommittedUpdate{}, nil)
 }
 

From ffd355c6c4e1b81a4e98016d190ef292d635a717 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 24 Nov 2023 12:03:23 +0200
Subject: [PATCH 02/18] wtdb: add TowerStatus to Tower

This is added as a TLV record meaning that all the towers currently on
disk that don't have this new field will be seen as Active.
---
 watchtower/wtdb/codec_test.go |  1 +
 watchtower/wtdb/tower.go      | 66 +++++++++++++++++++++++++++++++++--
 2 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/watchtower/wtdb/codec_test.go b/watchtower/wtdb/codec_test.go
index 228d2a0ec..3f2e59864 100644
--- a/watchtower/wtdb/codec_test.go
+++ b/watchtower/wtdb/codec_test.go
@@ -179,6 +179,7 @@ func TestCodec(tt *testing.T) {
 			obj := wtdb.Tower{
 				IdentityKey: pk,
 				Addresses:   addrs,
+				Status:      wtdb.TowerStatus(r.Uint32()),
 			}
 
 			v[0] = reflect.ValueOf(obj)
diff --git a/watchtower/wtdb/tower.go b/watchtower/wtdb/tower.go
index ca9dbeb28..9a0e052b8 100644
--- a/watchtower/wtdb/tower.go
+++ b/watchtower/wtdb/tower.go
@@ -7,6 +7,26 @@ import (
 	"net"
 
 	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/lightningnetwork/lnd/tlv"
+)
+
+// TowerStatus represents the state of the tower as set by the tower client.
+type TowerStatus uint8
+
+const (
+	// TowerStatusActive is the default state of the tower, and it indicates
+	// that this tower should be used to attempt session creation.
+	TowerStatusActive TowerStatus = 0
+
+	// TowerStatusInactive indicates that the tower should not be used to
+	// attempt session creation.
+	TowerStatusInactive TowerStatus = 1
+)
+
+const (
+	// TowerStatusTLVType is the TLV type number that will be used to store
+	// the tower's status.
+	TowerStatusTLVType = tlv.Type(0)
 )
 
 // TowerID is a unique 64-bit identifier allocated to each unique watchtower.
@@ -41,6 +61,9 @@ type Tower struct {
 
 	// Addresses is a list of possible addresses to reach the tower.
 	Addresses []net.Addr
+
+	// Status is the status of this tower as set by the client.
+	Status TowerStatus
 }
 
 // AddAddress adds the given address to the tower's in-memory list of addresses.
@@ -88,17 +111,56 @@ func (t *Tower) String() string {
 // Encode writes the Tower to the passed io.Writer. The TowerID is not
 // serialized, since it acts as the key.
 func (t *Tower) Encode(w io.Writer) error {
-	return WriteElements(w,
+	err := WriteElements(w,
 		t.IdentityKey,
 		t.Addresses,
 	)
+	if err != nil {
+		return err
+	}
+
+	status := uint8(t.Status)
+	tlvRecords := []tlv.Record{
+		tlv.MakePrimitiveRecord(TowerStatusTLVType, &status),
+	}
+
+	tlvStream, err := tlv.NewStream(tlvRecords...)
+	if err != nil {
+		return err
+	}
+
+	return tlvStream.Encode(w)
 }
 
 // Decode reads a Tower from the passed io.Reader. The TowerID is meant to be
 // decoded from the key.
 func (t *Tower) Decode(r io.Reader) error {
-	return ReadElements(r,
+	err := ReadElements(r,
 		&t.IdentityKey,
 		&t.Addresses,
 	)
+	if err != nil {
+		return err
+	}
+
+	var status uint8
+	tlvRecords := []tlv.Record{
+		tlv.MakePrimitiveRecord(TowerStatusTLVType, &status),
+	}
+
+	tlvStream, err := tlv.NewStream(tlvRecords...)
+	if err != nil {
+		return err
+	}
+
+	typeMap, err := tlvStream.DecodeWithParsedTypes(r)
+	if err != nil {
+		return err
+	}
+
+	if _, ok := typeMap[TowerStatusTLVType]; ok {
+		t.Status = TowerStatus(status)
+	}
+
+	return nil
 }

From 0bb1816fff19ecc505f7177e8e9b10cba6d70df2 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 24 Nov 2023 12:14:04 +0200
Subject: [PATCH 03/18] watchtower: add filter function to ListTowers

And then only load active towers on client start up.
---
 watchtower/wtclient/client.go    |  5 ++++-
 watchtower/wtclient/interface.go |  5 +++--
 watchtower/wtclient/manager.go   |  2 +-
 watchtower/wtdb/client_db.go     | 16 ++++++++++++++--
 4 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/watchtower/wtclient/client.go b/watchtower/wtclient/client.go
index fa76ebd58..a5afb2def 100644
--- a/watchtower/wtclient/client.go
+++ b/watchtower/wtclient/client.go
@@ -261,7 +261,10 @@ func getTowerAndSessionCandidates(db DB, keyRing ECDHKeyRing,
 	opts ...wtdb.ClientSessionListOption) (
 	map[wtdb.SessionID]*ClientSession, error) {
 
-	towers, err := db.ListTowers()
+	// Fetch all active towers from the DB.
+	towers, err := db.ListTowers(func(tower *wtdb.Tower) bool {
+		return tower.Status == wtdb.TowerStatusActive
+	})
 	if err != nil {
 		return nil, err
 	}
diff --git a/watchtower/wtclient/interface.go b/watchtower/wtclient/interface.go
index c1d71c0e7..2ae0c108a 100644
--- a/watchtower/wtclient/interface.go
+++ b/watchtower/wtclient/interface.go
@@ -41,8 +41,9 @@ type DB interface {
 	LoadTowerByID(wtdb.TowerID) (*wtdb.Tower, error)
 
 	// ListTowers retrieves the list of towers available within the
-	// database.
-	ListTowers() ([]*wtdb.Tower, error)
+	// database. The filter function may be set in order to filter out the
+	// towers to be returned.
+	ListTowers(filter wtdb.TowerFilterFn) ([]*wtdb.Tower, error)
 
 	// NextSessionKeyIndex reserves a new session key derivation index for a
 	// particular tower id and blob type. The index is reserved for that
diff --git a/watchtower/wtclient/manager.go b/watchtower/wtclient/manager.go
index 70f2a0542..7ffc60c48 100644
--- a/watchtower/wtclient/manager.go
+++ b/watchtower/wtclient/manager.go
@@ -455,7 +455,7 @@ func (m *Manager) Stats() ClientStats {
 func (m *Manager) RegisteredTowers(opts ...wtdb.ClientSessionListOption) (
 	map[blob.Type][]*RegisteredTower, error) {
 
-	towers, err := m.cfg.DB.ListTowers()
+	towers, err := m.cfg.DB.ListTowers(nil)
 	if err != nil {
 		return nil, err
 	}
diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index 46b3e73f5..e681e6c75 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -632,8 +632,14 @@ func (c *ClientDB) LoadTower(pubKey *btcec.PublicKey) (*Tower, error) {
 	return tower, nil
 }
 
-// ListTowers retrieves the list of towers available within the database.
-func (c *ClientDB) ListTowers() ([]*Tower, error) {
+// TowerFilterFn is the signature of a call-back function that can be used to
+// skip certain towers in the ListTowers method.
+type TowerFilterFn func(*Tower) bool
+
+// ListTowers retrieves the list of towers available within the database that
+// have a status matching the given status. The filter function may be set in
+// order to filter out the towers to be returned.
+func (c *ClientDB) ListTowers(filter TowerFilterFn) ([]*Tower, error) {
 	var towers []*Tower
 	err := kvdb.View(c.db, func(tx kvdb.RTx) error {
 		towerBucket := tx.ReadBucket(cTowerBkt)
@@ -646,7 +652,13 @@ func (c *ClientDB) ListTowers() ([]*Tower, error) {
 			if err != nil {
 				return err
 			}
+
+			if filter != nil && !filter(tower) {
+				return nil
+			}
+
 			towers = append(towers, tower)
+
 			return nil
 		})
 	}, func() {

From 4548e72f79e372d8db12631599b2aae3cd137bf8 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Mon, 27 Nov 2023 13:23:18 +0200
Subject: [PATCH 04/18] wtdb: add a DeactivateTower method

This new method sets the tower's status to inactive so that it is not
loaded at startup as a candidate tower. We also ensure that a tower's
status is set to active if the CreateTower is called when the tower
already exists.
---
 watchtower/wtclient/interface.go  |  5 ++
 watchtower/wtdb/client_db.go      | 71 +++++++++++++++++++++++--
 watchtower/wtdb/client_db_test.go | 88 +++++++++++++++++++++++++++++++
 3 files changed, 159 insertions(+), 5 deletions(-)

diff --git a/watchtower/wtclient/interface.go b/watchtower/wtclient/interface.go
index 2ae0c108a..df5ee8257 100644
--- a/watchtower/wtclient/interface.go
+++ b/watchtower/wtclient/interface.go
@@ -140,6 +140,11 @@ type DB interface {
 	// DeleteCommittedUpdates deletes all the committed updates belonging to
 	// the given session from the db.
 	DeleteCommittedUpdates(id *wtdb.SessionID) error
+
+	// DeactivateTower sets the given tower's status to inactive. This means
+	// that this tower's sessions won't be loaded and used for backups.
+	// CreateTower can be used to reactivate the tower again.
+	DeactivateTower(pubKey *btcec.PublicKey) error
 }
 
 // AuthDialer connects to a remote node using an authenticated transport, such
diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index e681e6c75..5ed986ff6 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -387,6 +387,9 @@ func (c *ClientDB) CreateTower(lnAddr *lnwire.NetAddress) (*Tower, error) {
 				return err
 			}
 
+			// Set its status to active.
+			tower.Status = TowerStatusActive
+
 			// Add the new address to the existing tower. If the
 			// address is a duplicate, this will result in no
 			// change.
@@ -503,14 +506,14 @@ func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
 			return nil
 		}
 
+		tower, err := getTower(towers, towerIDBytes)
+		if err != nil {
+			return err
+		}
+
 		// If an address is provided, then we should _only_ remove the
 		// address record from the database.
 		if addr != nil {
-			tower, err := getTower(towers, towerIDBytes)
-			if err != nil {
-				return err
-			}
-
 			// Towers should always have at least one address saved.
 			tower.RemoveAddress(addr)
 			if len(tower.Addresses) == 0 {
@@ -560,6 +563,13 @@ func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
 			)
 		}
 
+		// Otherwise, we mark the tower as inactive.
+		tower.Status = TowerStatusInactive
+		err = putTower(towers, tower)
+		if err != nil {
+			return err
+		}
+
 		// We'll mark its sessions as inactive as long as they don't
 		// have any pending updates to ensure we don't load them upon
 		// restarts.
@@ -579,6 +589,57 @@ func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
 	}, func() {})
 }
 
+// DeactivateTower sets the given tower's status to inactive. This means that
+// this tower's sessions won't be loaded and used for backups. CreateTower can
+// be used to reactivate the tower again.
+func (c *ClientDB) DeactivateTower(pubKey *btcec.PublicKey) error {
+	return kvdb.Update(c.db, func(tx kvdb.RwTx) error {
+		towers := tx.ReadWriteBucket(cTowerBkt)
+		if towers == nil {
+			return ErrUninitializedDB
+		}
+
+		towerIndex := tx.ReadWriteBucket(cTowerIndexBkt)
+		if towerIndex == nil {
+			return ErrUninitializedDB
+		}
+
+		towersToSessionsIndex := tx.ReadWriteBucket(
+			cTowerToSessionIndexBkt,
+		)
+		if towersToSessionsIndex == nil {
+			return ErrUninitializedDB
+		}
+
+		chanIDIndexBkt := tx.ReadBucket(cChanIDIndexBkt)
+		if chanIDIndexBkt == nil {
+			return ErrUninitializedDB
+		}
+
+		pubKeyBytes := pubKey.SerializeCompressed()
+		towerIDBytes := towerIndex.Get(pubKeyBytes)
+		if towerIDBytes == nil {
+			return ErrTowerNotFound
+		}
+
+		tower, err := getTower(towers, towerIDBytes)
+		if err != nil {
+			return err
+		}
+
+		// If the tower already has the desired status, then we can exit
+		// here.
+		if tower.Status == TowerStatusInactive {
+			return nil
+		}
+
+		// Otherwise, we update the status and re-store the tower.
+		tower.Status = TowerStatusInactive
+
+		return putTower(towers, tower)
+	}, func() {})
+}
+
 // LoadTowerByID retrieves a tower by its tower ID.
 func (c *ClientDB) LoadTowerByID(towerID TowerID) (*Tower, error) {
 	var tower *Tower
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 475b72837..464a6a7d9 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -89,6 +89,26 @@ func (h *clientDBHarness) createTower(lnAddr *lnwire.NetAddress,
 	return tower
 }
 
+func (h *clientDBHarness) deactivateTower(pubKey *btcec.PublicKey,
+	expErr error) {
+
+	h.t.Helper()
+
+	err := h.db.DeactivateTower(pubKey)
+	require.ErrorIs(h.t, err, expErr)
+}
+
+func (h *clientDBHarness) listTowers(filterFn wtdb.TowerFilterFn,
+	expErr error) []*wtdb.Tower {
+
+	h.t.Helper()
+
+	towers, err := h.db.ListTowers(filterFn)
+	require.ErrorIs(h.t, err, expErr)
+
+	return towers
+}
+
 func (h *clientDBHarness) removeTower(pubKey *btcec.PublicKey, addr net.Addr,
 	hasSessions bool, expErr error) {
 
@@ -547,6 +567,70 @@ func testRemoveTower(h *clientDBHarness) {
 	}, nil)
 }
 
+// testTowerStatusChange tests that the Tower status is updated accordingly
+// given a variety of commands.
+func testTowerStatusChange(h *clientDBHarness) {
+	// Create a new tower.
+	pk, err := randPubKey()
+	require.NoError(h.t, err)
+
+	towerAddr := &lnwire.NetAddress{
+		IdentityKey: pk,
+		Address: &net.TCPAddr{
+			IP: []byte{0x01, 0x00, 0x00, 0x00}, Port: 9911,
+		},
+	}
+
+	tower := h.createTower(towerAddr, nil)
+
+	// Add a new session.
+	session := h.randSession(h.t, tower.ID, 100)
+	h.insertSession(session, nil)
+
+	// assertTowerStatus is a helper function that will assert that the
+	// tower's status is as expected.
+	assertTowerStatus := func(status wtdb.TowerStatus) {
+		activeFilter := func(tower *wtdb.Tower) bool {
+			return tower.Status == status
+		}
+
+		towers := h.listTowers(activeFilter, nil)
+		require.Len(h.t, towers, 1)
+		require.EqualValues(h.t, towers[0].Status, status)
+	}
+
+	// assertSessionStatus is a helper that will assert that the session's
+	// status is as expected
+	assertSessionStatus := func(status wtdb.CSessionStatus) {
+		sessions := h.listSessions(&tower.ID)
+		require.Len(h.t, sessions, 1)
+		for _, sess := range sessions {
+			require.EqualValues(h.t, sess.Status, status)
+		}
+	}
+
+	// Initially, the tower and session should be active.
+	assertTowerStatus(wtdb.TowerStatusActive)
+	assertSessionStatus(wtdb.CSessionActive)
+
+	// Removing the tower should change its status and its session status
+	// to inactive.
+	h.removeTower(tower.IdentityKey, nil, true, nil)
+	assertTowerStatus(wtdb.TowerStatusInactive)
+	assertSessionStatus(wtdb.CSessionInactive)
+
+	// Re-adding the tower in some way should re-active it and its session.
+	h.createTower(towerAddr, nil)
+	assertTowerStatus(wtdb.TowerStatusActive)
+	assertSessionStatus(wtdb.CSessionActive)
+
+	// Deactivating the tower should change its status but its session
+	// status should remain active.
+	h.deactivateTower(tower.IdentityKey, nil)
+	assertTowerStatus(wtdb.TowerStatusInactive)
+	assertSessionStatus(wtdb.CSessionActive)
+}
+
 // testChanSummaries tests the process of a registering a channel and its
 // associated sweep pkscript.
 func testChanSummaries(h *clientDBHarness) {
@@ -1142,6 +1226,10 @@ func TestClientDB(t *testing.T) {
 			name: "max commitment heights",
 			run:  testMaxCommitmentHeights,
 		},
+		{
+			name: "test tower status change",
+			run:  testTowerStatusChange,
+		},
 	}
 
 	for _, database := range dbs {

From beb9b2eeb872363574a0277a374ca4ec6529a951 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Tue, 5 Dec 2023 13:01:18 +0200
Subject: [PATCH 05/18] wtclient: add DeactivateTower method

This commit adds the DeactiateTower method to the wtclient.ClientManager
interface along with its implementation. A test is also added for the
new method.
---
 watchtower/wtclient/client.go        | 127 ++++++++++++++++++++++++---
 watchtower/wtclient/client_test.go   |  82 +++++++++++++++++
 watchtower/wtclient/manager.go       |  57 +++++++++++-
 watchtower/wtclient/session_queue.go |   4 +-
 4 files changed, 253 insertions(+), 17 deletions(-)

diff --git a/watchtower/wtclient/client.go b/watchtower/wtclient/client.go
index a5afb2def..04faa1231 100644
--- a/watchtower/wtclient/client.go
+++ b/watchtower/wtclient/client.go
@@ -132,6 +132,22 @@ type staleTowerMsg struct {
 	errChan chan error
 }
 
+// deactivateTowerMsg is an internal message we'll use within the TowerClient
+// to signal that a tower should be marked as inactive.
+type deactivateTowerMsg struct {
+	// id is the unique database identifier for the tower.
+	id wtdb.TowerID
+
+	// pubKey is the identifying public key of the watchtower.
+	pubKey *btcec.PublicKey
+
+	// errChan is the channel through which we'll send a response back to
+	// the caller when handling their request.
+	//
+	// NOTE: This channel must be buffered.
+	errChan chan error
+}
+
 // clientCfg holds the configuration values required by a client.
 type clientCfg struct {
 	*Config
@@ -165,8 +181,9 @@ type client struct {
 	statTicker *time.Ticker
 	stats      *clientStats
 
-	newTowers   chan *newTowerMsg
-	staleTowers chan *staleTowerMsg
+	newTowers        chan *newTowerMsg
+	staleTowers      chan *staleTowerMsg
+	deactivateTowers chan *deactivateTowerMsg
 
 	wg   sync.WaitGroup
 	quit chan struct{}
@@ -192,15 +209,16 @@ func newClient(cfg *clientCfg) (*client, error) {
 	}
 
 	c := &client{
-		cfg:            cfg,
-		log:            plog,
-		pipeline:       queue,
-		activeSessions: newSessionQueueSet(),
-		statTicker:     time.NewTicker(DefaultStatInterval),
-		stats:          new(clientStats),
-		newTowers:      make(chan *newTowerMsg),
-		staleTowers:    make(chan *staleTowerMsg),
-		quit:           make(chan struct{}),
+		cfg:              cfg,
+		log:              plog,
+		pipeline:         queue,
+		activeSessions:   newSessionQueueSet(),
+		statTicker:       time.NewTicker(DefaultStatInterval),
+		stats:            new(clientStats),
+		newTowers:        make(chan *newTowerMsg),
+		staleTowers:      make(chan *staleTowerMsg),
+		deactivateTowers: make(chan *deactivateTowerMsg),
+		quit:             make(chan struct{}),
 	}
 
 	candidateTowers := newTowerListIterator()
@@ -514,8 +532,8 @@ func (c *client) nextSessionQueue() (*sessionQueue, error) {
 
 // stopAndRemoveSession stops the session with the given ID and removes it from
 // the in-memory active sessions set.
-func (c *client) stopAndRemoveSession(id wtdb.SessionID) error {
-	return c.activeSessions.StopAndRemove(id)
+func (c *client) stopAndRemoveSession(id wtdb.SessionID, final bool) error {
+	return c.activeSessions.StopAndRemove(id, final)
 }
 
 // deleteSessionFromTower dials the tower that we created the session with and
@@ -694,6 +712,12 @@ func (c *client) backupDispatcher() {
 			case msg := <-c.staleTowers:
 				msg.errChan <- c.handleStaleTower(msg)
 
+			// A tower has been requested to be de-activated. We'll
+			// only allow this if the tower is not currently being
+			// used for session negotiation.
+			case msg := <-c.deactivateTowers:
+				msg.errChan <- c.handleDeactivateTower(msg)
+
 			case <-c.quit:
 				return
 			}
@@ -779,6 +803,10 @@ func (c *client) backupDispatcher() {
 			case msg := <-c.staleTowers:
 				msg.errChan <- c.handleStaleTower(msg)
 
+			// A tower has been requested to be de-activated.
+			case msg := <-c.deactivateTowers:
+				msg.errChan <- c.handleDeactivateTower(msg)
+
 			case <-c.quit:
 				return
 			}
@@ -1046,6 +1074,77 @@ func (c *client) initActiveQueue(s *ClientSession,
 	return sq
 }
 
+// deactivateTower sends a tower deactivation request to the backupDispatcher
+// where it will be handled synchronously. The request should result in all the
+// sessions that we have with the given tower being shutdown and removed from
+// our in-memory set of active sessions.
+func (c *client) deactivateTower(id wtdb.TowerID,
+	pubKey *btcec.PublicKey) error {
+
+	errChan := make(chan error, 1)
+
+	select {
+	case c.deactivateTowers <- &deactivateTowerMsg{
+		id:      id,
+		pubKey:  pubKey,
+		errChan: errChan,
+	}:
+	case <-c.pipeline.quit:
+		return ErrClientExiting
+	}
+
+	select {
+	case err := <-errChan:
+		return err
+	case <-c.pipeline.quit:
+		return ErrClientExiting
+	}
+}
+
+// handleDeactivateTower handles a request to deactivate a tower. We will remove
+// it from the in-memory candidate set, and we will also stop any active
+// sessions we have with this tower.
+func (c *client) handleDeactivateTower(msg *deactivateTowerMsg) error {
+	// Remove the tower from our in-memory candidate set so that it is not
+	// used for any new session negotiations.
+	err := c.candidateTowers.RemoveCandidate(msg.id, nil)
+	if err != nil {
+		return err
+	}
+
+	pubKey := msg.pubKey.SerializeCompressed()
+	sessions, err := c.cfg.DB.ListClientSessions(&msg.id)
+	if err != nil {
+		return fmt.Errorf("unable to retrieve sessions for tower %x: "+
+			"%v", pubKey, err)
+	}
+
+	// Iterate over all the sessions we have for this tower and remove them
+	// from our candidate set and also from our set of started, active
+	// sessions.
+	for sessionID := range sessions {
+		delete(c.candidateSessions, sessionID)
+
+		err = c.activeSessions.StopAndRemove(sessionID, false)
+		if err != nil {
+			return fmt.Errorf("could not stop session %s: %w",
+				sessionID, err)
+		}
+	}
+
+	// If our active session queue corresponds to the stale tower, we'll
+	// proceed to negotiate a new one.
+	if c.sessionQueue != nil {
+		towerKey := c.sessionQueue.tower.IdentityKey
+
+		if bytes.Equal(pubKey, towerKey.SerializeCompressed()) {
+			c.sessionQueue = nil
+		}
+	}
+
+	return nil
+}
+
 // addTower adds a new watchtower reachable at the given address and considers
 // it for new sessions. If the watchtower already exists, then any new addresses
 // included will be considered when dialing it for session negotiations and
@@ -1152,7 +1251,7 @@ func (c *client) handleStaleTower(msg *staleTowerMsg) error {
 
 		// Shutdown the session so that any pending updates are
 		// replayed back onto the main task pipeline.
-		err = c.activeSessions.StopAndRemove(sessionID)
+		err = c.activeSessions.StopAndRemove(sessionID, true)
 		if err != nil {
 			c.log.Errorf("could not stop session %s: %w", sessionID,
 				err)
diff --git a/watchtower/wtclient/client_test.go b/watchtower/wtclient/client_test.go
index 81674f0c0..0e5352f88 100644
--- a/watchtower/wtclient/client_test.go
+++ b/watchtower/wtclient/client_test.go
@@ -2688,6 +2688,88 @@ var clientTests = []clientTest{
 			require.NoError(h.t, err)
 		},
 	},
+	{
+		name: "de-activate a tower",
+		cfg: harnessCfg{
+			localBalance:  localBalance,
+			remoteBalance: remoteBalance,
+			policy: wtpolicy.Policy{
+				TxPolicy:   defaultTxPolicy,
+				MaxUpdates: 5,
+			},
+		},
+		fn: func(h *testHarness) {
+			const (
+				numUpdates = 10
+				chanIDInt  = 0
+			)
+
+			// Advance the channel with a few updates.
+			hints := h.advanceChannelN(chanIDInt, numUpdates)
+
+			// Backup a few these updates and wait for them to
+			// arrive at the server.
+			h.backupStates(chanIDInt, 0, numUpdates/2, nil)
+			h.server.waitForUpdates(hints[:numUpdates/2], waitTime)
+
+			// Lookup the tower and assert that it currently is
+			// seen as an active session candidate.
+			resp, err := h.clientMgr.LookupTower(
+				h.server.addr.IdentityKey,
+			)
+			require.NoError(h.t, err)
+			tower, ok := resp[blob.TypeAltruistTaprootCommit]
+			require.True(h.t, ok)
+			require.True(h.t, tower.ActiveSessionCandidate)
+
+			// Deactivate the tower.
+			err = h.clientMgr.DeactivateTower(
+				h.server.addr.IdentityKey,
+			)
+			require.NoError(h.t, err)
+
+			// Assert that it is no longer seen as an active
+			// session candidate.
+			resp, err = h.clientMgr.LookupTower(
+				h.server.addr.IdentityKey,
+			)
+			require.NoError(h.t, err)
+			tower, ok = resp[blob.TypeAltruistTaprootCommit]
+			require.True(h.t, ok)
+			require.False(h.t, tower.ActiveSessionCandidate)
+
+			// Add a new tower.
+			server2 := newServerHarness(
+				h.t, h.net, towerAddr2Str, nil,
+			)
+			server2.start()
+			h.addTower(server2.addr)
+
+			// Backup a few more states and assert that they appear
+			// on the second tower server.
+			h.backupStates(
+				chanIDInt, numUpdates/2, numUpdates-1, nil,
+			)
+			server2.waitForUpdates(
+				hints[numUpdates/2:numUpdates-1], waitTime,
+			)
+
+			// Reactivate the first tower.
+			err = h.clientMgr.AddTower(h.server.addr)
+			require.NoError(h.t, err)
+
+			// Deactivate the second tower.
+			err = h.clientMgr.DeactivateTower(
+				server2.addr.IdentityKey,
+			)
+			require.NoError(h.t, err)
+
+			// Backup the last backup and assert that it appears
+			// on the first tower.
+			h.backupStates(chanIDInt, numUpdates-1, numUpdates, nil)
+			h.server.waitForUpdates(hints[numUpdates-1:], waitTime)
+		},
+	},
 }
 
 // TestClient executes the client test suite, asserting the ability to backup
diff --git a/watchtower/wtclient/manager.go b/watchtower/wtclient/manager.go
index 7ffc60c48..17a351c15 100644
--- a/watchtower/wtclient/manager.go
+++ b/watchtower/wtclient/manager.go
@@ -38,6 +38,11 @@ type ClientManager interface {
 	// instead.
 	RemoveTower(*btcec.PublicKey, net.Addr) error
 
+	// DeactivateTower sets the given tower's status to inactive so that it
+	// is not considered for session negotiation. Its sessions will also not
+	// be used while the tower is inactive.
+	DeactivateTower(pubKey *btcec.PublicKey) error
+
 	// Stats returns the in-memory statistics of the client since startup.
 	Stats() ClientStats
 
@@ -431,6 +436,56 @@ func (m *Manager) RemoveTower(key *btcec.PublicKey, addr net.Addr) error {
 	return nil
 }
 
+// DeactivateTower sets the given tower's status to inactive so that it is not
+// considered for session negotiation. Its sessions will also not be used while
+// the tower is inactive.
+func (m *Manager) DeactivateTower(key *btcec.PublicKey) error {
+	// We'll load the tower in order to retrieve its ID within the database.
+	tower, err := m.cfg.DB.LoadTower(key)
+	if err != nil {
+		return err
+	}
+
+	m.clientsMu.Lock()
+	defer m.clientsMu.Unlock()
+
+	for _, client := range m.clients {
+		err := client.deactivateTower(tower.ID, tower.IdentityKey)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Finally, mark the tower as inactive in the DB.
+	err = m.cfg.DB.DeactivateTower(key)
+	if err != nil {
+		log.Errorf("Could not deactivate the tower. Re-activating. %v",
+			err)
+
+		// If the persisted state update fails, re-add the address to
+		// our client's in-memory state.
+		tower, newTowerErr := NewTowerFromDBTower(tower)
+		if newTowerErr != nil {
+			log.Errorf("Could not create new in-memory tower: %v",
+				newTowerErr)
+
+			return err
+		}
+
+		for _, client := range m.clients {
+			addTowerErr := client.addTower(tower)
+			if addTowerErr != nil {
+				log.Errorf("Could not re-add tower: %v",
+					addTowerErr)
+			}
+		}
+
+		return err
+	}
+
+	return nil
+}
+
 // Stats returns the in-memory statistics of the clients managed by the Manager
 // since startup.
 func (m *Manager) Stats() ClientStats {
@@ -850,7 +905,7 @@ func (m *Manager) handleClosableSessions(
 				// Stop the session and remove it from the
 				// in-memory set.
 				err = client.stopAndRemoveSession(
-					item.sessionID,
+					item.sessionID, true,
 				)
 				if err != nil {
 					log.Errorf("could not remove "+
diff --git a/watchtower/wtclient/session_queue.go b/watchtower/wtclient/session_queue.go
index 3c1126a89..786410515 100644
--- a/watchtower/wtclient/session_queue.go
+++ b/watchtower/wtclient/session_queue.go
@@ -765,7 +765,7 @@ func (s *sessionQueueSet) AddAndStart(sessionQueue *sessionQueue) {
 
 // StopAndRemove stops the given session queue and removes it from the
 // sessionQueueSet.
-func (s *sessionQueueSet) StopAndRemove(id wtdb.SessionID) error {
+func (s *sessionQueueSet) StopAndRemove(id wtdb.SessionID, final bool) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
@@ -776,7 +776,7 @@ func (s *sessionQueueSet) StopAndRemove(id wtdb.SessionID) error {
 
 	delete(s.queues, id)
 
-	return queue.Stop(true)
+	return queue.Stop(final)
 }
 
 // Get fetches and returns the sessionQueue with the given ID.

From 26432359ad8b2e108fc8d9aa6aa292353c4236bd Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Tue, 28 Nov 2023 18:21:44 +0200
Subject: [PATCH 06/18] lnrpc+lncli: add DeactivateTower to rpc

---
 cmd/lncli/wtclient.go                         |  39 ++
 lnrpc/wtclientrpc/watchtowerclient.pb.json.go |  25 +
 lnrpc/wtclientrpc/wtclient.go                 |  30 +
 lnrpc/wtclientrpc/wtclient.pb.go              | 548 +++++++++++-------
 lnrpc/wtclientrpc/wtclient.pb.gw.go           |  99 ++++
 lnrpc/wtclientrpc/wtclient.proto              |  18 +
 lnrpc/wtclientrpc/wtclient.swagger.json       |  42 ++
 lnrpc/wtclientrpc/wtclient.yaml               |   2 +
 lnrpc/wtclientrpc/wtclient_grpc.pb.go         |  44 ++
 9 files changed, 641 insertions(+), 206 deletions(-)

diff --git a/cmd/lncli/wtclient.go b/cmd/lncli/wtclient.go
index 068fc3005..488e828b9 100644
--- a/cmd/lncli/wtclient.go
+++ b/cmd/lncli/wtclient.go
@@ -20,6 +20,7 @@ func wtclientCommands() []cli.Command {
 			Subcommands: []cli.Command{
 				addTowerCommand,
 				removeTowerCommand,
+				deactivateTowerCommand,
 				listTowersCommand,
 				getTowerCommand,
 				statsCommand,
@@ -84,6 +85,44 @@ func addTower(ctx *cli.Context) error {
 	return nil
 }
 
+var deactivateTowerCommand = cli.Command{
+	Name: "deactivate",
+	Usage: "Deactivate a watchtower to temporarily prevent its use for " +
+		"sessions/backups.",
+	ArgsUsage: "pubkey",
+	Action:    actionDecorator(deactivateTower),
+}
+
+func deactivateTower(ctx *cli.Context) error {
+	ctxc := getContext()
+
+	// Display the command's help message if the number of arguments/flags
+	// is not what we expect.
+	if ctx.NArg() != 1 || ctx.NumFlags() > 0 {
+		return cli.ShowCommandHelp(ctx, "deactivate")
+	}
+
+	pubKey, err := hex.DecodeString(ctx.Args().First())
+	if err != nil {
+		return fmt.Errorf("invalid public key: %w", err)
+	}
+
+	client, cleanUp := getWtclient(ctx)
+	defer cleanUp()
+
+	req := &wtclientrpc.DeactivateTowerRequest{
+		Pubkey: pubKey,
+	}
+	resp, err := client.DeactivateTower(ctxc, req)
+	if err != nil {
+		return err
+	}
+
+	printRespJSON(resp)
+
+	return nil
+}
+
 var removeTowerCommand = cli.Command{
 	Name: "remove",
 	Usage: "Remove a watchtower to prevent its use for future " +
diff --git a/lnrpc/wtclientrpc/watchtowerclient.pb.json.go b/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
index aed077de5..338c65331 100644
--- a/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
+++ b/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
@@ -71,6 +71,31 @@ func RegisterWatchtowerClientJSONCallbacks(registry map[string]func(ctx context.
 		callback(string(respBytes), nil)
 	}
 
+	registry["wtclientrpc.WatchtowerClient.DeactivateTower"] = func(ctx context.Context,
+		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
+
+		req := &DeactivateTowerRequest{}
+		err := marshaler.Unmarshal([]byte(reqJSON), req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		client := NewWatchtowerClientClient(conn)
+		resp, err := client.DeactivateTower(ctx, req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		respBytes, err := marshaler.Marshal(resp)
+		if err != nil {
+			callback("", err)
+			return
+		}
+		callback(string(respBytes), nil)
+	}
+
 	registry["wtclientrpc.WatchtowerClient.ListTowers"] = func(ctx context.Context,
 		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
 
diff --git a/lnrpc/wtclientrpc/wtclient.go b/lnrpc/wtclientrpc/wtclient.go
index 4a68e22a0..045a01b57 100644
--- a/lnrpc/wtclientrpc/wtclient.go
+++ b/lnrpc/wtclientrpc/wtclient.go
@@ -44,6 +44,10 @@ var (
 			Entity: "offchain",
 			Action: "write",
 		}},
+		"/wtclientrpc.WatchtowerClient/DeactivateTower": {{
+			Entity: "offchain",
+			Action: "write",
+		}},
 		"/wtclientrpc.WatchtowerClient/ListTowers": {{
 			Entity: "offchain",
 			Action: "read",
@@ -251,6 +255,32 @@ func (c *WatchtowerClient) RemoveTower(ctx context.Context,
 	return &RemoveTowerResponse{}, nil
 }
 
+// DeactivateTower sets the given tower's status to inactive so that it is not
+// considered for session negotiation. Its sessions will also not be used while
+// the tower is inactive.
+func (c *WatchtowerClient) DeactivateTower(_ context.Context,
+	req *DeactivateTowerRequest) (*DeactivateTowerResponse, error) {
+
+	if err := c.isActive(); err != nil {
+		return nil, err
+	}
+
+	pubKey, err := btcec.ParsePubKey(req.Pubkey)
+	if err != nil {
+		return nil, err
+	}
+
+	err = c.cfg.ClientMgr.DeactivateTower(pubKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return &DeactivateTowerResponse{
+		Status: fmt.Sprintf("Successful deactivation of tower: %x",
+			req.Pubkey),
+	}, nil
+}
+
 // ListTowers returns the list of watchtowers registered with the client.
 func (c *WatchtowerClient) ListTowers(ctx context.Context,
 	req *ListTowersRequest) (*ListTowersResponse, error) {
diff --git a/lnrpc/wtclientrpc/wtclient.pb.go b/lnrpc/wtclientrpc/wtclient.pb.go
index 063b5f534..32f124fee 100644
--- a/lnrpc/wtclientrpc/wtclient.pb.go
+++ b/lnrpc/wtclientrpc/wtclient.pb.go
@@ -264,6 +264,102 @@ func (*RemoveTowerResponse) Descriptor() ([]byte, []int) {
 	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{3}
 }
 
+type DeactivateTowerRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The identifying public key of the watchtower to deactivate.
+	Pubkey []byte `protobuf:"bytes,1,opt,name=pubkey,proto3" json:"pubkey,omitempty"`
+}
+
+func (x *DeactivateTowerRequest) Reset() {
+	*x = DeactivateTowerRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DeactivateTowerRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DeactivateTowerRequest) ProtoMessage() {}
+
+func (x *DeactivateTowerRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DeactivateTowerRequest.ProtoReflect.Descriptor instead.
+func (*DeactivateTowerRequest) Descriptor() ([]byte, []int) {
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *DeactivateTowerRequest) GetPubkey() []byte {
+	if x != nil {
+		return x.Pubkey
+	}
+	return nil
+}
+
+type DeactivateTowerResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A string describing the action that took place.
+	Status string `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+}
+
+func (x *DeactivateTowerResponse) Reset() {
+	*x = DeactivateTowerResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DeactivateTowerResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DeactivateTowerResponse) ProtoMessage() {}
+
+func (x *DeactivateTowerResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DeactivateTowerResponse.ProtoReflect.Descriptor instead.
+func (*DeactivateTowerResponse) Descriptor() ([]byte, []int) {
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *DeactivateTowerResponse) GetStatus() string {
+	if x != nil {
+		return x.Status
+	}
+	return ""
+}
+
 type GetTowerInfoRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -281,7 +377,7 @@ type GetTowerInfoRequest struct {
 func (x *GetTowerInfoRequest) Reset() {
 	*x = GetTowerInfoRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[4]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -294,7 +390,7 @@ func (x *GetTowerInfoRequest) String() string {
 func (*GetTowerInfoRequest) ProtoMessage() {}
 
 func (x *GetTowerInfoRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[4]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -307,7 +403,7 @@ func (x *GetTowerInfoRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetTowerInfoRequest.ProtoReflect.Descriptor instead.
 func (*GetTowerInfoRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{4}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *GetTowerInfoRequest) GetPubkey() []byte {
@@ -358,7 +454,7 @@ type TowerSession struct {
 func (x *TowerSession) Reset() {
 	*x = TowerSession{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[5]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -371,7 +467,7 @@ func (x *TowerSession) String() string {
 func (*TowerSession) ProtoMessage() {}
 
 func (x *TowerSession) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[5]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -384,7 +480,7 @@ func (x *TowerSession) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TowerSession.ProtoReflect.Descriptor instead.
 func (*TowerSession) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{5}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *TowerSession) GetNumBackups() uint32 {
@@ -457,7 +553,7 @@ type Tower struct {
 func (x *Tower) Reset() {
 	*x = Tower{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -470,7 +566,7 @@ func (x *Tower) String() string {
 func (*Tower) ProtoMessage() {}
 
 func (x *Tower) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -483,7 +579,7 @@ func (x *Tower) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Tower.ProtoReflect.Descriptor instead.
 func (*Tower) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{6}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *Tower) GetPubkey() []byte {
@@ -549,7 +645,7 @@ type TowerSessionInfo struct {
 func (x *TowerSessionInfo) Reset() {
 	*x = TowerSessionInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -562,7 +658,7 @@ func (x *TowerSessionInfo) String() string {
 func (*TowerSessionInfo) ProtoMessage() {}
 
 func (x *TowerSessionInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -575,7 +671,7 @@ func (x *TowerSessionInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TowerSessionInfo.ProtoReflect.Descriptor instead.
 func (*TowerSessionInfo) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{7}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *TowerSessionInfo) GetActiveSessionCandidate() bool {
@@ -621,7 +717,7 @@ type ListTowersRequest struct {
 func (x *ListTowersRequest) Reset() {
 	*x = ListTowersRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -634,7 +730,7 @@ func (x *ListTowersRequest) String() string {
 func (*ListTowersRequest) ProtoMessage() {}
 
 func (x *ListTowersRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -647,7 +743,7 @@ func (x *ListTowersRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListTowersRequest.ProtoReflect.Descriptor instead.
 func (*ListTowersRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{8}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *ListTowersRequest) GetIncludeSessions() bool {
@@ -676,7 +772,7 @@ type ListTowersResponse struct {
 func (x *ListTowersResponse) Reset() {
 	*x = ListTowersResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -689,7 +785,7 @@ func (x *ListTowersResponse) String() string {
 func (*ListTowersResponse) ProtoMessage() {}
 
 func (x *ListTowersResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -702,7 +798,7 @@ func (x *ListTowersResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListTowersResponse.ProtoReflect.Descriptor instead.
 func (*ListTowersResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{9}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *ListTowersResponse) GetTowers() []*Tower {
@@ -721,7 +817,7 @@ type StatsRequest struct {
 func (x *StatsRequest) Reset() {
 	*x = StatsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -734,7 +830,7 @@ func (x *StatsRequest) String() string {
 func (*StatsRequest) ProtoMessage() {}
 
 func (x *StatsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -747,7 +843,7 @@ func (x *StatsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StatsRequest.ProtoReflect.Descriptor instead.
 func (*StatsRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{10}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{12}
 }
 
 type StatsResponse struct {
@@ -773,7 +869,7 @@ type StatsResponse struct {
 func (x *StatsResponse) Reset() {
 	*x = StatsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -786,7 +882,7 @@ func (x *StatsResponse) String() string {
 func (*StatsResponse) ProtoMessage() {}
 
 func (x *StatsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -799,7 +895,7 @@ func (x *StatsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StatsResponse.ProtoReflect.Descriptor instead.
 func (*StatsResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{11}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *StatsResponse) GetNumBackups() uint32 {
@@ -849,7 +945,7 @@ type PolicyRequest struct {
 func (x *PolicyRequest) Reset() {
 	*x = PolicyRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -862,7 +958,7 @@ func (x *PolicyRequest) String() string {
 func (*PolicyRequest) ProtoMessage() {}
 
 func (x *PolicyRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -875,7 +971,7 @@ func (x *PolicyRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PolicyRequest.ProtoReflect.Descriptor instead.
 func (*PolicyRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{12}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *PolicyRequest) GetPolicyType() PolicyType {
@@ -907,7 +1003,7 @@ type PolicyResponse struct {
 func (x *PolicyResponse) Reset() {
 	*x = PolicyResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -920,7 +1016,7 @@ func (x *PolicyResponse) String() string {
 func (*PolicyResponse) ProtoMessage() {}
 
 func (x *PolicyResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -933,7 +1029,7 @@ func (x *PolicyResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PolicyResponse.ProtoReflect.Descriptor instead.
 func (*PolicyResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{13}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *PolicyResponse) GetMaxUpdates() uint32 {
@@ -975,141 +1071,153 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
 	0x12, 0x18, 0x0a, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x02, 0x20, 0x01, 0x28,
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-	0x54, 0x6f, 0x77, 0x65, 0x72, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x44,
-	0x0a, 0x0c, 0x47, 0x65, 0x74, 0x54, 0x6f, 0x77, 0x65, 0x72, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x20,
-	0x2e, 0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x47, 0x65, 0x74,
-	0x54, 0x6f, 0x77, 0x65, 0x72, 0x49, 0x6e, 0x66, 0x6f, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
-	0x1a, 0x12, 0x2e, 0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x54,
-	0x6f, 0x77, 0x65, 0x72, 0x12, 0x3e, 0x0a, 0x05, 0x53, 0x74, 0x61, 0x74, 0x73, 0x12, 0x19, 0x2e,
-	0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x74, 0x61, 0x74,
-	0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1a, 0x2e, 0x77, 0x74, 0x63, 0x6c, 0x69,
-	0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x74, 0x61, 0x74, 0x73, 0x52, 0x65, 0x73, 0x70,
-	0x6f, 0x6e, 0x73, 0x65, 0x12, 0x41, 0x0a, 0x06, 0x50, 0x6f, 0x6c, 0x69, 0x63, 0x79, 0x12, 0x1a,
-	0x2e, 0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x50, 0x6f, 0x6c,
-	0x69, 0x63, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1b, 0x2e, 0x77, 0x74, 0x63,
-	0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x2e, 0x50, 0x6f, 0x6c, 0x69, 0x63, 0x79, 0x52,
-	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x33, 0x5a, 0x31, 0x67, 0x69, 0x74, 0x68, 0x75,
-	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6c, 0x69, 0x67, 0x68, 0x74, 0x6e, 0x69, 0x6e, 0x67, 0x6e,
-	0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x2f, 0x6c, 0x6e, 0x64, 0x2f, 0x6c, 0x6e, 0x72, 0x70, 0x63,
-	0x2f, 0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x33,
+	0x63, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x33, 0x5a, 0x31, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6c, 0x69, 0x67, 0x68, 0x74, 0x6e, 0x69,
+	0x6e, 0x67, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x2f, 0x6c, 0x6e, 0x64, 0x2f, 0x6c, 0x6e,
+	0x72, 0x70, 0x63, 0x2f, 0x77, 0x74, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x72, 0x70, 0x63, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1125,45 +1233,49 @@ func file_wtclientrpc_wtclient_proto_rawDescGZIP() []byte {
 }
 
 var file_wtclientrpc_wtclient_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_wtclientrpc_wtclient_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
+var file_wtclientrpc_wtclient_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_wtclientrpc_wtclient_proto_goTypes = []interface{}{
-	(PolicyType)(0),             // 0: wtclientrpc.PolicyType
-	(*AddTowerRequest)(nil),     // 1: wtclientrpc.AddTowerRequest
-	(*AddTowerResponse)(nil),    // 2: wtclientrpc.AddTowerResponse
-	(*RemoveTowerRequest)(nil),  // 3: wtclientrpc.RemoveTowerRequest
-	(*RemoveTowerResponse)(nil), // 4: wtclientrpc.RemoveTowerResponse
-	(*GetTowerInfoRequest)(nil), // 5: wtclientrpc.GetTowerInfoRequest
-	(*TowerSession)(nil),        // 6: wtclientrpc.TowerSession
-	(*Tower)(nil),               // 7: wtclientrpc.Tower
-	(*TowerSessionInfo)(nil),    // 8: wtclientrpc.TowerSessionInfo
-	(*ListTowersRequest)(nil),   // 9: wtclientrpc.ListTowersRequest
-	(*ListTowersResponse)(nil),  // 10: wtclientrpc.ListTowersResponse
-	(*StatsRequest)(nil),        // 11: wtclientrpc.StatsRequest
-	(*StatsResponse)(nil),       // 12: wtclientrpc.StatsResponse
-	(*PolicyRequest)(nil),       // 13: wtclientrpc.PolicyRequest
-	(*PolicyResponse)(nil),      // 14: wtclientrpc.PolicyResponse
+	(PolicyType)(0),                 // 0: wtclientrpc.PolicyType
+	(*AddTowerRequest)(nil),         // 1: wtclientrpc.AddTowerRequest
+	(*AddTowerResponse)(nil),        // 2: wtclientrpc.AddTowerResponse
+	(*RemoveTowerRequest)(nil),      // 3: wtclientrpc.RemoveTowerRequest
+	(*RemoveTowerResponse)(nil),     // 4: wtclientrpc.RemoveTowerResponse
+	(*DeactivateTowerRequest)(nil),  // 5: wtclientrpc.DeactivateTowerRequest
+	(*DeactivateTowerResponse)(nil), // 6: wtclientrpc.DeactivateTowerResponse
+	(*GetTowerInfoRequest)(nil),     // 7: wtclientrpc.GetTowerInfoRequest
+	(*TowerSession)(nil),            // 8: wtclientrpc.TowerSession
+	(*Tower)(nil),                   // 9: wtclientrpc.Tower
+	(*TowerSessionInfo)(nil),        // 10: wtclientrpc.TowerSessionInfo
+	(*ListTowersRequest)(nil),       // 11: wtclientrpc.ListTowersRequest
+	(*ListTowersResponse)(nil),      // 12: wtclientrpc.ListTowersResponse
+	(*StatsRequest)(nil),            // 13: wtclientrpc.StatsRequest
+	(*StatsResponse)(nil),           // 14: wtclientrpc.StatsResponse
+	(*PolicyRequest)(nil),           // 15: wtclientrpc.PolicyRequest
+	(*PolicyResponse)(nil),          // 16: wtclientrpc.PolicyResponse
 }
 var file_wtclientrpc_wtclient_proto_depIdxs = []int32{
-	6,  // 0: wtclientrpc.Tower.sessions:type_name -> wtclientrpc.TowerSession
-	8,  // 1: wtclientrpc.Tower.session_info:type_name -> wtclientrpc.TowerSessionInfo
-	6,  // 2: wtclientrpc.TowerSessionInfo.sessions:type_name -> wtclientrpc.TowerSession
+	8,  // 0: wtclientrpc.Tower.sessions:type_name -> wtclientrpc.TowerSession
+	10, // 1: wtclientrpc.Tower.session_info:type_name -> wtclientrpc.TowerSessionInfo
+	8,  // 2: wtclientrpc.TowerSessionInfo.sessions:type_name -> wtclientrpc.TowerSession
 	0,  // 3: wtclientrpc.TowerSessionInfo.policy_type:type_name -> wtclientrpc.PolicyType
-	7,  // 4: wtclientrpc.ListTowersResponse.towers:type_name -> wtclientrpc.Tower
+	9,  // 4: wtclientrpc.ListTowersResponse.towers:type_name -> wtclientrpc.Tower
 	0,  // 5: wtclientrpc.PolicyRequest.policy_type:type_name -> wtclientrpc.PolicyType
 	1,  // 6: wtclientrpc.WatchtowerClient.AddTower:input_type -> wtclientrpc.AddTowerRequest
 	3,  // 7: wtclientrpc.WatchtowerClient.RemoveTower:input_type -> wtclientrpc.RemoveTowerRequest
-	9,  // 8: wtclientrpc.WatchtowerClient.ListTowers:input_type -> wtclientrpc.ListTowersRequest
-	5,  // 9: wtclientrpc.WatchtowerClient.GetTowerInfo:input_type -> wtclientrpc.GetTowerInfoRequest
-	11, // 10: wtclientrpc.WatchtowerClient.Stats:input_type -> wtclientrpc.StatsRequest
-	13, // 11: wtclientrpc.WatchtowerClient.Policy:input_type -> wtclientrpc.PolicyRequest
-	2,  // 12: wtclientrpc.WatchtowerClient.AddTower:output_type -> wtclientrpc.AddTowerResponse
-	4,  // 13: wtclientrpc.WatchtowerClient.RemoveTower:output_type -> wtclientrpc.RemoveTowerResponse
-	10, // 14: wtclientrpc.WatchtowerClient.ListTowers:output_type -> wtclientrpc.ListTowersResponse
-	7,  // 15: wtclientrpc.WatchtowerClient.GetTowerInfo:output_type -> wtclientrpc.Tower
-	12, // 16: wtclientrpc.WatchtowerClient.Stats:output_type -> wtclientrpc.StatsResponse
-	14, // 17: wtclientrpc.WatchtowerClient.Policy:output_type -> wtclientrpc.PolicyResponse
-	12, // [12:18] is the sub-list for method output_type
-	6,  // [6:12] is the sub-list for method input_type
+	5,  // 8: wtclientrpc.WatchtowerClient.DeactivateTower:input_type -> wtclientrpc.DeactivateTowerRequest
+	11, // 9: wtclientrpc.WatchtowerClient.ListTowers:input_type -> wtclientrpc.ListTowersRequest
+	7,  // 10: wtclientrpc.WatchtowerClient.GetTowerInfo:input_type -> wtclientrpc.GetTowerInfoRequest
+	13, // 11: wtclientrpc.WatchtowerClient.Stats:input_type -> wtclientrpc.StatsRequest
+	15, // 12: wtclientrpc.WatchtowerClient.Policy:input_type -> wtclientrpc.PolicyRequest
+	2,  // 13: wtclientrpc.WatchtowerClient.AddTower:output_type -> wtclientrpc.AddTowerResponse
+	4,  // 14: wtclientrpc.WatchtowerClient.RemoveTower:output_type -> wtclientrpc.RemoveTowerResponse
+	6,  // 15: wtclientrpc.WatchtowerClient.DeactivateTower:output_type -> wtclientrpc.DeactivateTowerResponse
+	12, // 16: wtclientrpc.WatchtowerClient.ListTowers:output_type -> wtclientrpc.ListTowersResponse
+	9,  // 17: wtclientrpc.WatchtowerClient.GetTowerInfo:output_type -> wtclientrpc.Tower
+	14, // 18: wtclientrpc.WatchtowerClient.Stats:output_type -> wtclientrpc.StatsResponse
+	16, // 19: wtclientrpc.WatchtowerClient.Policy:output_type -> wtclientrpc.PolicyResponse
+	13, // [13:20] is the sub-list for method output_type
+	6,  // [6:13] is the sub-list for method input_type
 	6,  // [6:6] is the sub-list for extension type_name
 	6,  // [6:6] is the sub-list for extension extendee
 	0,  // [0:6] is the sub-list for field type_name
@@ -1224,7 +1336,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetTowerInfoRequest); i {
+			switch v := v.(*DeactivateTowerRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1236,7 +1348,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TowerSession); i {
+			switch v := v.(*DeactivateTowerResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1248,7 +1360,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Tower); i {
+			switch v := v.(*GetTowerInfoRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1260,7 +1372,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TowerSessionInfo); i {
+			switch v := v.(*TowerSession); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1272,7 +1384,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListTowersRequest); i {
+			switch v := v.(*Tower); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1284,7 +1396,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListTowersResponse); i {
+			switch v := v.(*TowerSessionInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1296,7 +1408,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StatsRequest); i {
+			switch v := v.(*ListTowersRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1308,7 +1420,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StatsResponse); i {
+			switch v := v.(*ListTowersResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1320,7 +1432,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PolicyRequest); i {
+			switch v := v.(*StatsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1332,6 +1444,30 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StatsResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_wtclientrpc_wtclient_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PolicyRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_wtclientrpc_wtclient_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*PolicyResponse); i {
 			case 0:
 				return &v.state
@@ -1350,7 +1486,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_wtclientrpc_wtclient_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   14,
+			NumMessages:   16,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/lnrpc/wtclientrpc/wtclient.pb.gw.go b/lnrpc/wtclientrpc/wtclient.pb.gw.go
index 331976431..f3d3e70de 100644
--- a/lnrpc/wtclientrpc/wtclient.pb.gw.go
+++ b/lnrpc/wtclientrpc/wtclient.pb.gw.go
@@ -135,6 +135,58 @@ func local_request_WatchtowerClient_RemoveTower_0(ctx context.Context, marshaler
 
 }
 
+func request_WatchtowerClient_DeactivateTower_0(ctx context.Context, marshaler runtime.Marshaler, client WatchtowerClientClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq DeactivateTowerRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["pubkey"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "pubkey")
+	}
+
+	protoReq.Pubkey, err = runtime.Bytes(val)
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "pubkey", err)
+	}
+
+	msg, err := client.DeactivateTower(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_WatchtowerClient_DeactivateTower_0(ctx context.Context, marshaler runtime.Marshaler, server WatchtowerClientServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq DeactivateTowerRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["pubkey"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "pubkey")
+	}
+
+	protoReq.Pubkey, err = runtime.Bytes(val)
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "pubkey", err)
+	}
+
+	msg, err := server.DeactivateTower(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
 var (
 	filter_WatchtowerClient_ListTowers_0 = &utilities.DoubleArray{Encoding: map[string]int{}, Base: []int(nil), Check: []int(nil)}
 )
@@ -347,6 +399,29 @@ func RegisterWatchtowerClientHandlerServer(ctx context.Context, mux *runtime.Ser
 
 	})
 
+	mux.Handle("POST", pattern_WatchtowerClient_DeactivateTower_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req, "/wtclientrpc.WatchtowerClient/DeactivateTower", runtime.WithHTTPPathPattern("/v2/watchtower/client/tower/deactivate/{pubkey}"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_WatchtowerClient_DeactivateTower_0(rctx, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WatchtowerClient_DeactivateTower_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	mux.Handle("GET", pattern_WatchtowerClient_ListTowers_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
 		ctx, cancel := context.WithCancel(req.Context())
 		defer cancel()
@@ -520,6 +595,26 @@ func RegisterWatchtowerClientHandlerClient(ctx context.Context, mux *runtime.Ser
 
 	})
 
+	mux.Handle("POST", pattern_WatchtowerClient_DeactivateTower_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req, "/wtclientrpc.WatchtowerClient/DeactivateTower", runtime.WithHTTPPathPattern("/v2/watchtower/client/tower/deactivate/{pubkey}"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_WatchtowerClient_DeactivateTower_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WatchtowerClient_DeactivateTower_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	mux.Handle("GET", pattern_WatchtowerClient_ListTowers_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
 		ctx, cancel := context.WithCancel(req.Context())
 		defer cancel()
@@ -608,6 +703,8 @@ var (
 
 	pattern_WatchtowerClient_RemoveTower_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 1, 0, 4, 1, 5, 3}, []string{"v2", "watchtower", "client", "pubkey"}, ""))
 
+	pattern_WatchtowerClient_DeactivateTower_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3, 2, 4, 1, 0, 4, 1, 5, 5}, []string{"v2", "watchtower", "client", "tower", "deactivate", "pubkey"}, ""))
+
 	pattern_WatchtowerClient_ListTowers_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v2", "watchtower", "client"}, ""))
 
 	pattern_WatchtowerClient_GetTowerInfo_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3, 1, 0, 4, 1, 5, 4}, []string{"v2", "watchtower", "client", "info", "pubkey"}, ""))
@@ -622,6 +719,8 @@ var (
 
 	forward_WatchtowerClient_RemoveTower_0 = runtime.ForwardResponseMessage
 
+	forward_WatchtowerClient_DeactivateTower_0 = runtime.ForwardResponseMessage
+
 	forward_WatchtowerClient_ListTowers_0 = runtime.ForwardResponseMessage
 
 	forward_WatchtowerClient_GetTowerInfo_0 = runtime.ForwardResponseMessage
diff --git a/lnrpc/wtclientrpc/wtclient.proto b/lnrpc/wtclientrpc/wtclient.proto
index b236e0158..b0bf53cf0 100644
--- a/lnrpc/wtclientrpc/wtclient.proto
+++ b/lnrpc/wtclientrpc/wtclient.proto
@@ -41,6 +41,14 @@ service WatchtowerClient {
     */
     rpc RemoveTower (RemoveTowerRequest) returns (RemoveTowerResponse);
 
+    /* lncli: `wtclient deactivate`
+    DeactivateTower sets the given tower's status to inactive so that it
+    is not considered for session negotiation. Its sessions will also not
+    be used while the tower is inactive.
+    */
+    rpc DeactivateTower (DeactivateTowerRequest)
+        returns (DeactivateTowerResponse);
+
     /* lncli: `wtclient towers`
     ListTowers returns the list of watchtowers registered with the client.
     */
@@ -88,6 +96,16 @@ message RemoveTowerRequest {
 message RemoveTowerResponse {
 }
 
+message DeactivateTowerRequest {
+    // The identifying public key of the watchtower to deactivate.
+    bytes pubkey = 1;
+}
+
+message DeactivateTowerResponse {
+    // A string describing the action that took place.
+    string status = 1;
+}
+
 message GetTowerInfoRequest {
     // The identifying public key of the watchtower to retrieve information for.
     bytes pubkey = 1;
diff --git a/lnrpc/wtclientrpc/wtclient.swagger.json b/lnrpc/wtclientrpc/wtclient.swagger.json
index 36dc87981..bef43e944 100644
--- a/lnrpc/wtclientrpc/wtclient.swagger.json
+++ b/lnrpc/wtclientrpc/wtclient.swagger.json
@@ -194,6 +194,39 @@
         ]
       }
     },
+    "/v2/watchtower/client/tower/deactivate/{pubkey}": {
+      "post": {
+        "summary": "lncli: `wtclient deactivate`\nDeactivateTower sets the given tower's status to inactive so that it\nis not considered for session negotiation. Its sessions will also not\nbe used while the tower is inactive.",
+        "operationId": "WatchtowerClient_DeactivateTower",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/wtclientrpcDeactivateTowerResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "pubkey",
+            "description": "The identifying public key of the watchtower to deactivate.",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "format": "byte"
+          }
+        ],
+        "tags": [
+          "WatchtowerClient"
+        ]
+      }
+    },
     "/v2/watchtower/client/{pubkey}": {
       "delete": {
         "summary": "lncli: `wtclient remove`\nRemoveTower removes a watchtower from being considered for future session\nnegotiations and from being used for any subsequent backups until it's added\nagain. If an address is provided, then this RPC only serves as a way of\nremoving the address from the watchtower instead.",
@@ -283,6 +316,15 @@
     "wtclientrpcAddTowerResponse": {
       "type": "object"
     },
+    "wtclientrpcDeactivateTowerResponse": {
+      "type": "object",
+      "properties": {
+        "status": {
+          "type": "string",
+          "description": "A string describing the action that took place."
+        }
+      }
+    },
     "wtclientrpcListTowersResponse": {
       "type": "object",
       "properties": {
diff --git a/lnrpc/wtclientrpc/wtclient.yaml b/lnrpc/wtclientrpc/wtclient.yaml
index 011a43ba1..6f02969dd 100644
--- a/lnrpc/wtclientrpc/wtclient.yaml
+++ b/lnrpc/wtclientrpc/wtclient.yaml
@@ -8,6 +8,8 @@ http:
       body: "*"
     - selector: wtclientrpc.WatchtowerClient.RemoveTower
       delete: "/v2/watchtower/client/{pubkey}"
+    - selector: wtclientrpc.WatchtowerClient.DeactivateTower
+      post: "/v2/watchtower/client/tower/deactivate/{pubkey}"
     - selector: wtclientrpc.WatchtowerClient.ListTowers
       get: "/v2/watchtower/client"
     - selector: wtclientrpc.WatchtowerClient.GetTowerInfo
diff --git a/lnrpc/wtclientrpc/wtclient_grpc.pb.go b/lnrpc/wtclientrpc/wtclient_grpc.pb.go
index cbae01fee..86347ebf3 100644
--- a/lnrpc/wtclientrpc/wtclient_grpc.pb.go
+++ b/lnrpc/wtclientrpc/wtclient_grpc.pb.go
@@ -30,6 +30,11 @@ type WatchtowerClientClient interface {
 	// again. If an address is provided, then this RPC only serves as a way of
 	// removing the address from the watchtower instead.
 	RemoveTower(ctx context.Context, in *RemoveTowerRequest, opts ...grpc.CallOption) (*RemoveTowerResponse, error)
+	// lncli: `wtclient deactivate`
+	// DeactivateTower sets the given tower's status to inactive so that it
+	// is not considered for session negotiation. Its sessions will also not
+	// be used while the tower is inactive.
+	DeactivateTower(ctx context.Context, in *DeactivateTowerRequest, opts ...grpc.CallOption) (*DeactivateTowerResponse, error)
 	// lncli: `wtclient towers`
 	// ListTowers returns the list of watchtowers registered with the client.
 	ListTowers(ctx context.Context, in *ListTowersRequest, opts ...grpc.CallOption) (*ListTowersResponse, error)
@@ -70,6 +75,15 @@ func (c *watchtowerClientClient) RemoveTower(ctx context.Context, in *RemoveTowe
 	return out, nil
 }
 
+func (c *watchtowerClientClient) DeactivateTower(ctx context.Context, in *DeactivateTowerRequest, opts ...grpc.CallOption) (*DeactivateTowerResponse, error) {
+	out := new(DeactivateTowerResponse)
+	err := c.cc.Invoke(ctx, "/wtclientrpc.WatchtowerClient/DeactivateTower", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *watchtowerClientClient) ListTowers(ctx context.Context, in *ListTowersRequest, opts ...grpc.CallOption) (*ListTowersResponse, error) {
 	out := new(ListTowersResponse)
 	err := c.cc.Invoke(ctx, "/wtclientrpc.WatchtowerClient/ListTowers", in, out, opts...)
@@ -122,6 +136,11 @@ type WatchtowerClientServer interface {
 	// again. If an address is provided, then this RPC only serves as a way of
 	// removing the address from the watchtower instead.
 	RemoveTower(context.Context, *RemoveTowerRequest) (*RemoveTowerResponse, error)
+	// lncli: `wtclient deactivate`
+	// DeactivateTower sets the given tower's status to inactive so that it
+	// is not considered for session negotiation. Its sessions will also not
+	// be used while the tower is inactive.
+	DeactivateTower(context.Context, *DeactivateTowerRequest) (*DeactivateTowerResponse, error)
 	// lncli: `wtclient towers`
 	// ListTowers returns the list of watchtowers registered with the client.
 	ListTowers(context.Context, *ListTowersRequest) (*ListTowersResponse, error)
@@ -147,6 +166,9 @@ func (UnimplementedWatchtowerClientServer) AddTower(context.Context, *AddTowerRe
 func (UnimplementedWatchtowerClientServer) RemoveTower(context.Context, *RemoveTowerRequest) (*RemoveTowerResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method RemoveTower not implemented")
 }
+func (UnimplementedWatchtowerClientServer) DeactivateTower(context.Context, *DeactivateTowerRequest) (*DeactivateTowerResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method DeactivateTower not implemented")
+}
 func (UnimplementedWatchtowerClientServer) ListTowers(context.Context, *ListTowersRequest) (*ListTowersResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListTowers not implemented")
 }
@@ -208,6 +230,24 @@ func _WatchtowerClient_RemoveTower_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _WatchtowerClient_DeactivateTower_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(DeactivateTowerRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(WatchtowerClientServer).DeactivateTower(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/wtclientrpc.WatchtowerClient/DeactivateTower",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(WatchtowerClientServer).DeactivateTower(ctx, req.(*DeactivateTowerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _WatchtowerClient_ListTowers_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ListTowersRequest)
 	if err := dec(in); err != nil {
@@ -295,6 +335,10 @@ var WatchtowerClient_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "RemoveTower",
 			Handler:    _WatchtowerClient_RemoveTower_Handler,
 		},
+		{
+			MethodName: "DeactivateTower",
+			Handler:    _WatchtowerClient_DeactivateTower_Handler,
+		},
 		{
 			MethodName: "ListTowers",
 			Handler:    _WatchtowerClient_ListTowers_Handler,

From 5cb8c8df7ef2a000dde7d2776bd499d75abc9eae Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Tue, 28 Nov 2023 18:28:52 +0200
Subject: [PATCH 07/18] wtdb: rename CSessionInactive to CSessionTerminal

Since we will now change this to mean that the session should not ever
be activated again.
---
 watchtower/wtdb/client_db.go      | 2 +-
 watchtower/wtdb/client_db_test.go | 6 +++---
 watchtower/wtdb/client_session.go | 6 +++---
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index 5ed986ff6..6ebfd273b 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -578,7 +578,7 @@ func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
 				return ErrTowerUnackedUpdates
 			}
 			err := markSessionStatus(
-				sessions, session, CSessionInactive,
+				sessions, session, CSessionTerminal,
 			)
 			if err != nil {
 				return err
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 464a6a7d9..4619695d0 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -146,10 +146,10 @@ func (h *clientDBHarness) removeTower(pubKey *btcec.PublicKey, addr net.Addr,
 		}
 
 		for _, session := range h.listSessions(&tower.ID) {
-			require.Equal(h.t, wtdb.CSessionInactive,
+			require.Equal(h.t, wtdb.CSessionTerminal,
 				session.Status, "expected status for session "+
 					"%v to be %v, got %v", session.ID,
-				wtdb.CSessionInactive, session.Status)
+				wtdb.CSessionTerminal, session.Status)
 		}
 	}
 }
@@ -617,7 +617,7 @@ func testTowerStatusChange(h *clientDBHarness) {
 	// to inactive.
 	h.removeTower(tower.IdentityKey, nil, true, nil)
 	assertTowerStatus(wtdb.TowerStatusInactive)
-	assertSessionStatus(wtdb.CSessionInactive)
+	assertSessionStatus(wtdb.CSessionTerminal)
 
 	// Re-adding the tower in some way should re-active it and its session.
 	h.createTower(towerAddr, nil)
diff --git a/watchtower/wtdb/client_session.go b/watchtower/wtdb/client_session.go
index e44331094..6b2890333 100644
--- a/watchtower/wtdb/client_session.go
+++ b/watchtower/wtdb/client_session.go
@@ -18,9 +18,9 @@ const (
 	// used for backups.
 	CSessionActive CSessionStatus = 0
 
-	// CSessionInactive indicates that the ClientSession is inactive and
-	// cannot be used for backups.
-	CSessionInactive CSessionStatus = 1
+	// CSessionTerminal indicates that the ClientSession is in a terminal
+	// state and cannot be used for backups.
+	CSessionTerminal CSessionStatus = 1
 )
 
 // ClientSession encapsulates a SessionInfo returned from a successful

From cbf08940ca2ab2b0c8a7a1c4dd75206400d9d5d8 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Mon, 27 Nov 2023 16:30:53 +0200
Subject: [PATCH 08/18] wtdb: let DeleteCommitedUpdates move session to
 terminal

In this commit, we adjust the DeleteCommitmentUpdate method so that it
marks a session as Terminal (if there are updates to delete) since once
we have deleted a commitment update from a session - the session is no
longer useable.
---
 watchtower/wtdb/client_db.go      | 43 ++++++++++++++++++++++++-------
 watchtower/wtdb/client_db_test.go | 38 +++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 10 deletions(-)

diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index 6ebfd273b..850ef5d17 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -1860,9 +1860,10 @@ func (c *ClientDB) MarkChannelClosed(chanID lnwire.ChannelID,
 
 // isSessionClosable returns true if a session is considered closable. A session
 // is considered closable only if all the following points are true:
-// 1) It has no un-acked updates.
-// 2) It is exhausted (ie it can't accept any more updates)
-// 3) All the channels that it has acked updates for are closed.
+//  1. It has no un-acked updates.
+//  2. It is exhausted (ie it can't accept any more updates) OR it has been
+//     marked as terminal.
+//  3. All the channels that it has acked updates for are closed.
 func isSessionClosable(sessionsBkt, chanDetailsBkt, chanIDIndexBkt kvdb.RBucket,
 	id *SessionID) (bool, error) {
 
@@ -1893,10 +1894,14 @@ func isSessionClosable(sessionsBkt, chanDetailsBkt, chanIDIndexBkt kvdb.RBucket,
 		return false, err
 	}
 
+	isTerminal := session.Status == CSessionTerminal
+
 	// We have already checked that the session has no more committed
-	// updates. So now we can check if the session is exhausted.
-	if session.SeqNum < session.Policy.MaxUpdates {
-		// If the session is not yet exhausted, it is not yet closable.
+	// updates. So now we can check if the session is exhausted or has a
+	// terminal state.
+	if !isTerminal && session.SeqNum < session.Policy.MaxUpdates {
+		// If the session is not yet exhausted, and it is not yet in a
+		// terminal state then it is not yet closable.
 		return false, nil
 	}
 
@@ -1916,11 +1921,16 @@ func isSessionClosable(sessionsBkt, chanDetailsBkt, chanIDIndexBkt kvdb.RBucket,
 		}
 	}
 
-	// If the session has no acked-updates, then something is wrong since
-	// the above check ensures that this session has been exhausted meaning
-	// that it should have MaxUpdates acked updates.
 	ackedRangeBkt := sessBkt.NestedReadBucket(cSessionAckRangeIndex)
 	if ackedRangeBkt == nil {
+		if isTerminal {
+			return true, nil
+		}
+
+		// If the session has no acked-updates, and it is not in a
+		// terminal state then something is wrong since the above check
+		// ensures that this session has been exhausted meaning that it
+		// should have MaxUpdates acked updates.
 		return false, fmt.Errorf("no acked-updates found for "+
 			"exhausted session %s", id)
 	}
@@ -2068,7 +2078,6 @@ func (c *ClientDB) CommitUpdate(id *SessionID,
 		lastApplied = session.TowerLastApplied
 
 		return nil
-
 	}, func() {
 		lastApplied = 0
 	})
@@ -2334,6 +2343,20 @@ func (c *ClientDB) DeleteCommittedUpdates(id *SessionID) error {
 			return err
 		}
 
+		session, err := getClientSessionBody(sessions, id[:])
+		if err != nil {
+			return err
+		}
+
+		// Once we delete a committed update from the session, the
+		// SeqNum of the session will be incorrect and so the session
+		// should be marked as terminal.
+		session.Status = CSessionTerminal
+		err = putClientSessionBody(sessionBkt, session)
+		if err != nil {
+			return err
+		}
+
 		// Delete all the committed updates in one go by deleting the
 		// session commits bucket.
 		return sessionBkt.DeleteNestedBucket(cSessionCommits)
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 4619695d0..489c6c016 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -1002,6 +1002,44 @@ func testMarkChannelClosed(h *clientDBHarness) {
 	// Assert that we now can delete the session.
 	h.deleteSession(session1.ID, nil)
 	require.Empty(h.t, h.listClosableSessions(nil))
+
+	// We also want to test that a session can be deleted if it has been
+	// marked as terminal.
+
+	// Create session2 with MaxUpdates set to 5.
+	session2 := h.randSession(h.t, tower.ID, 5)
+	h.insertSession(session2, nil)
+
+	// Create and register channel 7.
+	chanID7 := randChannelID(h.t)
+	h.registerChan(chanID7, nil, nil)
+
+	// Add two updates for channel 7 in session 2. Ack one of them so that
+	// the mapping from this channel to this session is created but don't
+	// ack the other since we want to delete the committed update later.
+	update = randCommittedUpdateForChannel(h.t, chanID7, 1)
+	h.commitUpdate(&session2.ID, update, nil)
+	h.ackUpdate(&session2.ID, 1, 1, nil)
+
+	update = randCommittedUpdateForChannel(h.t, chanID7, 2)
+	h.commitUpdate(&session2.ID, update, nil)
+
+	// Check that attempting to delete the session will fail since it is not
+	// yet considered closable.
+	h.deleteSession(session2.ID, wtdb.ErrSessionNotClosable)
+
+	// Now delete the added committed updates. This should put the
+	// session in the terminal state after which we should be able to
+	// delete the session.
+	h.deleteCommittedUpdates(&session2.ID, nil)
+
+	// Marking channel 7 as closed will now return session 2 since it has
+	// been marked as terminal.
+	sl = h.markChannelClosed(chanID7, 1, nil)
+	require.ElementsMatch(h.t, sl, []wtdb.SessionID{session2.ID})
+
+	// We should now be able to delete the session.
+	h.deleteSession(session2.ID, nil)
 }
 
 // testAckUpdate asserts the behavior of AckUpdate.

From 41582c0b8bfc04337be33a3dad50c0590f43c10c Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Mon, 27 Nov 2023 16:43:32 +0200
Subject: [PATCH 09/18] wtdb: create and remove tower should no longer change
 session status

---
 watchtower/wtclient/interface.go  |  7 ++---
 watchtower/wtdb/client_db.go      | 51 +++++--------------------------
 watchtower/wtdb/client_db_test.go | 26 +++++-----------
 3 files changed, 18 insertions(+), 66 deletions(-)

diff --git a/watchtower/wtclient/interface.go b/watchtower/wtclient/interface.go
index df5ee8257..ffc6ea694 100644
--- a/watchtower/wtclient/interface.go
+++ b/watchtower/wtclient/interface.go
@@ -26,10 +26,9 @@ type DB interface {
 	// RemoveTower modifies a tower's record within the database. If an
 	// address is provided, then _only_ the address record should be removed
 	// from the tower's persisted state. Otherwise, we'll attempt to mark
-	// the tower as inactive by marking all of its sessions inactive. If any
-	// of its sessions has unacked updates, then ErrTowerUnackedUpdates is
-	// returned. If the tower doesn't have any sessions at all, it'll be
-	// completely removed from the database.
+	// the tower as inactive. If any of its sessions have unacked updates,
+	// then ErrTowerUnackedUpdates is returned. If the tower doesn't have
+	// any sessions at all, it'll be completely removed from the database.
 	//
 	// NOTE: An error is not returned if the tower doesn't exist.
 	RemoveTower(*btcec.PublicKey, net.Addr) error
diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index 850ef5d17..a88cd49c4 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -394,37 +394,6 @@ func (c *ClientDB) CreateTower(lnAddr *lnwire.NetAddress) (*Tower, error) {
 			// address is a duplicate, this will result in no
 			// change.
 			tower.AddAddress(lnAddr.Address)
-
-			// If there are any client sessions that correspond to
-			// this tower, we'll mark them as active to ensure we
-			// load them upon restarts.
-			towerSessIndex := towerToSessionIndex.NestedReadBucket(
-				tower.ID.Bytes(),
-			)
-			if towerSessIndex == nil {
-				return ErrTowerNotFound
-			}
-
-			sessions := tx.ReadWriteBucket(cSessionBkt)
-			if sessions == nil {
-				return ErrUninitializedDB
-			}
-
-			err = towerSessIndex.ForEach(func(k, _ []byte) error {
-				session, err := getClientSessionBody(
-					sessions, k,
-				)
-				if err != nil {
-					return err
-				}
-
-				return markSessionStatus(
-					sessions, session, CSessionActive,
-				)
-			})
-			if err != nil {
-				return err
-			}
 		} else {
 			// No such tower exists, create a new tower id for our
 			// new tower. The error is unhandled since NextSequence
@@ -435,6 +404,7 @@ func (c *ClientDB) CreateTower(lnAddr *lnwire.NetAddress) (*Tower, error) {
 				ID:          TowerID(towerID),
 				IdentityKey: lnAddr.IdentityKey,
 				Addresses:   []net.Addr{lnAddr.Address},
+				Status:      TowerStatusActive,
 			}
 
 			towerIDBytes = tower.ID.Bytes()
@@ -468,10 +438,10 @@ func (c *ClientDB) CreateTower(lnAddr *lnwire.NetAddress) (*Tower, error) {
 
 // RemoveTower modifies a tower's record within the database. If an address is
 // provided, then _only_ the address record should be removed from the tower's
-// persisted state. Otherwise, we'll attempt to mark the tower as inactive by
-// marking all of its sessions inactive. If any of its sessions has unacked
-// updates, then ErrTowerUnackedUpdates is returned. If the tower doesn't have
-// any sessions at all, it'll be completely removed from the database.
+// persisted state. Otherwise, we'll attempt to mark the tower as inactive. If
+// any of its sessions has unacked updates, then ErrTowerUnackedUpdates is
+// returned. If the tower doesn't have any sessions at all, it'll be completely
+// removed from the database.
 //
 // NOTE: An error is not returned if the tower doesn't exist.
 func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
@@ -570,19 +540,12 @@ func (c *ClientDB) RemoveTower(pubKey *btcec.PublicKey, addr net.Addr) error {
 			return err
 		}
 
-		// We'll mark its sessions as inactive as long as they don't
-		// have any pending updates to ensure we don't load them upon
-		// restarts.
+		// We'll do a check to ensure that the tower's sessions don't
+		// have any pending back-ups.
 		for _, session := range towerSessions {
 			if committedUpdateCount[session.ID] > 0 {
 				return ErrTowerUnackedUpdates
 			}
-			err := markSessionStatus(
-				sessions, session, CSessionTerminal,
-			)
-			if err != nil {
-				return err
-			}
 		}
 
 		return nil
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 489c6c016..01ea0d8d8 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -145,12 +145,9 @@ func (h *clientDBHarness) removeTower(pubKey *btcec.PublicKey, addr net.Addr,
 			return
 		}
 
-		for _, session := range h.listSessions(&tower.ID) {
-			require.Equal(h.t, wtdb.CSessionTerminal,
-				session.Status, "expected status for session "+
-					"%v to be %v, got %v", session.ID,
-				wtdb.CSessionTerminal, session.Status)
-		}
+		require.EqualValues(
+			h.t, wtdb.TowerStatusInactive, tower.Status,
+		)
 	}
 }
 
@@ -551,20 +548,13 @@ func testRemoveTower(h *clientDBHarness) {
 	h.commitUpdate(&session.ID, update, nil)
 
 	// We should not be able to fully remove it from the database since
-	// there's a session and it has unacked updates.
+	// there's a session, and it has unacked updates.
 	h.removeTower(pk, nil, true, wtdb.ErrTowerUnackedUpdates)
 
 	// Removing the tower after all sessions no longer have unacked updates
-	// should result in the sessions becoming inactive.
+	// should succeed.
 	h.ackUpdate(&session.ID, 1, 1, nil)
 	h.removeTower(pk, nil, true, nil)
-
-	// Creating the tower again should mark all of the sessions active once
-	// again.
-	h.createTower(&lnwire.NetAddress{
-		IdentityKey: pk,
-		Address:     addr1,
-	}, nil)
 }
 
 // testTowerStatusChange tests that the Tower status is updated accordingly
@@ -613,11 +603,11 @@ func testTowerStatusChange(h *clientDBHarness) {
 	assertTowerStatus(wtdb.TowerStatusActive)
 	assertSessionStatus(wtdb.CSessionActive)
 
-	// Removing the tower should change its status and its session status
-	// to inactive.
+	// Removing the tower should change its status but its session
+	// status should remain active.
 	h.removeTower(tower.IdentityKey, nil, true, nil)
 	assertTowerStatus(wtdb.TowerStatusInactive)
-	assertSessionStatus(wtdb.CSessionTerminal)
+	assertSessionStatus(wtdb.CSessionActive)
 
 	// Re-adding the tower in some way should re-active it and its session.
 	h.createTower(towerAddr, nil)

From 05c03400a97c5b81d406b84bcaeb51bb0c88e095 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Wed, 29 Nov 2023 09:14:30 +0200
Subject: [PATCH 10/18] wtdb: add TerminateSession method

---
 watchtower/wtclient/interface.go  |  4 ++
 watchtower/wtdb/client_db.go      | 47 ++++++++++++++++++++
 watchtower/wtdb/client_db_test.go | 71 +++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+)

diff --git a/watchtower/wtclient/interface.go b/watchtower/wtclient/interface.go
index ffc6ea694..1051da0d5 100644
--- a/watchtower/wtclient/interface.go
+++ b/watchtower/wtclient/interface.go
@@ -33,6 +33,10 @@ type DB interface {
 	// NOTE: An error is not returned if the tower doesn't exist.
 	RemoveTower(*btcec.PublicKey, net.Addr) error
 
+	// TerminateSession sets the given session's status to CSessionTerminal
+	// meaning that it will not be usable again.
+	TerminateSession(id wtdb.SessionID) error
+
 	// LoadTower retrieves a tower by its public key.
 	LoadTower(*btcec.PublicKey) (*wtdb.Tower, error)
 
diff --git a/watchtower/wtdb/client_db.go b/watchtower/wtdb/client_db.go
index a88cd49c4..9731dfef8 100644
--- a/watchtower/wtdb/client_db.go
+++ b/watchtower/wtdb/client_db.go
@@ -2259,6 +2259,53 @@ func (c *ClientDB) GetDBQueue(namespace []byte) Queue[*BackupID] {
 	)
 }
 
+// TerminateSession sets the given session's status to CSessionTerminal meaning
+// that it will not be usable again. An error will be returned if the given
+// session still has un-acked updates that should be attended to.
+func (c *ClientDB) TerminateSession(id SessionID) error {
+	return kvdb.Update(c.db, func(tx kvdb.RwTx) error {
+		sessions := tx.ReadWriteBucket(cSessionBkt)
+		if sessions == nil {
+			return ErrUninitializedDB
+		}
+
+		sessionsBkt := tx.ReadBucket(cSessionBkt)
+		if sessionsBkt == nil {
+			return ErrUninitializedDB
+		}
+
+		chanIDIndexBkt := tx.ReadBucket(cChanIDIndexBkt)
+		if chanIDIndexBkt == nil {
+			return ErrUninitializedDB
+		}
+
+		// Collect any un-acked updates for this session.
+		committedUpdateCount := make(map[SessionID]uint16)
+		perCommittedUpdate := func(s *ClientSession,
+			_ *CommittedUpdate) {
+
+			committedUpdateCount[s.ID]++
+		}
+
+		session, err := c.getClientSession(
+			sessionsBkt, chanIDIndexBkt, id[:],
+			WithPerCommittedUpdate(perCommittedUpdate),
+		)
+		if err != nil {
+			return err
+		}
+
+		// If there are any un-acked updates for this session then
+		// we don't allow the change of status as these updates must
+		// first be dealt with somehow.
+		if committedUpdateCount[id] > 0 {
+			return ErrSessionHasUnackedUpdates
+		}
+
+		return markSessionStatus(sessions, session, CSessionTerminal)
+	}, func() {})
+}
+
 // DeleteCommittedUpdates deletes all the committed updates for the given
 // session.
 func (c *ClientDB) DeleteCommittedUpdates(id *SessionID) error {
diff --git a/watchtower/wtdb/client_db_test.go b/watchtower/wtdb/client_db_test.go
index 01ea0d8d8..dd6479b74 100644
--- a/watchtower/wtdb/client_db_test.go
+++ b/watchtower/wtdb/client_db_test.go
@@ -173,6 +173,24 @@ func (h *clientDBHarness) loadTowerByID(id wtdb.TowerID,
 	return tower
 }
 
+func (h *clientDBHarness) terminateSession(id wtdb.SessionID, expErr error) {
+	h.t.Helper()
+
+	err := h.db.TerminateSession(id)
+	require.ErrorIs(h.t, err, expErr)
+}
+
+func (h *clientDBHarness) getClientSession(id wtdb.SessionID,
+	expErr error) *wtdb.ClientSession {
+
+	h.t.Helper()
+
+	session, err := h.db.GetClientSession(id)
+	require.ErrorIs(h.t, err, expErr)
+
+	return session
+}
+
 func (h *clientDBHarness) fetchChanInfos() wtdb.ChannelInfos {
 	h.t.Helper()
 
@@ -557,6 +575,55 @@ func testRemoveTower(h *clientDBHarness) {
 	h.removeTower(pk, nil, true, nil)
 }
 
+func testTerminateSession(h *clientDBHarness) {
+	const blobType = blob.TypeAltruistCommit
+
+	tower := h.newTower()
+
+	// Create a new session that the updates in this will be tied to.
+	session := &wtdb.ClientSession{
+		ClientSessionBody: wtdb.ClientSessionBody{
+			TowerID: tower.ID,
+			Policy: wtpolicy.Policy{
+				TxPolicy: wtpolicy.TxPolicy{
+					BlobType: blobType,
+				},
+				MaxUpdates: 100,
+			},
+			RewardPkScript: []byte{0x01, 0x02, 0x03},
+		},
+		ID: wtdb.SessionID([33]byte{0x03}),
+	}
+
+	// Reserve a session key and insert the client session.
+	session.KeyIndex = h.nextKeyIndex(session.TowerID, blobType, false)
+	h.insertSession(session, nil)
+
+	// Commit to a random update at seqnum 1.
+	update1 := randCommittedUpdate(h.t, 1)
+	h.registerChan(update1.BackupID.ChanID, nil, nil)
+	lastApplied := h.commitUpdate(&session.ID, update1, nil)
+	require.Zero(h.t, lastApplied)
+
+	// Terminating the session now should fail since the session has an
+	// un-acked update.
+	h.terminateSession(session.ID, wtdb.ErrSessionHasUnackedUpdates)
+
+	// Fetch the session and assert that the status is still active.
+	sess := h.getClientSession(session.ID, nil)
+	require.Equal(h.t, wtdb.CSessionActive, sess.Status)
+
+	// Delete the update.
+	h.deleteCommittedUpdates(&session.ID, nil)
+
+	// Terminating the session now should succeed.
+	h.terminateSession(session.ID, nil)
+
+	// Fetch the session again and assert that its status is now Terminal.
+	sess = h.getClientSession(session.ID, nil)
+	require.Equal(h.t, wtdb.CSessionTerminal, sess.Status)
+}
+
 // testTowerStatusChange tests that the Tower status is updated accordingly
 // given a variety of commands.
 func testTowerStatusChange(h *clientDBHarness) {
@@ -1258,6 +1325,10 @@ func TestClientDB(t *testing.T) {
 			name: "test tower status change",
 			run:  testTowerStatusChange,
 		},
+		{
+			name: "terminate session",
+			run:  testTerminateSession,
+		},
 	}
 
 	for _, database := range dbs {

From 24702ede14a2aa2f5066b61c9e242b5403c03b92 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Tue, 5 Dec 2023 13:12:38 +0200
Subject: [PATCH 11/18] wtclient: add TerminateSession method

---
 watchtower/wtclient/client.go      |  96 ++++++++++++++++++---
 watchtower/wtclient/client_test.go | 133 +++++++++++++++++++++++++++--
 watchtower/wtclient/manager.go     |  21 +++++
 3 files changed, 231 insertions(+), 19 deletions(-)

diff --git a/watchtower/wtclient/client.go b/watchtower/wtclient/client.go
index 04faa1231..e8fec5d4a 100644
--- a/watchtower/wtclient/client.go
+++ b/watchtower/wtclient/client.go
@@ -148,6 +148,19 @@ type deactivateTowerMsg struct {
 	errChan chan error
 }
 
+// terminateSessMsg is an internal message we'll use within the TowerClient to
+// signal that a session should be terminated.
+type terminateSessMsg struct {
+	// id is the session identifier.
+	id wtdb.SessionID
+
+	// errChan is the channel through which we'll send a response back to
+	// the caller when handling their request.
+	//
+	// NOTE: This channel must be buffered.
+	errChan chan error
+}
+
 // clientCfg holds the configuration values required by a client.
 type clientCfg struct {
 	*Config
@@ -181,9 +194,10 @@ type client struct {
 	statTicker *time.Ticker
 	stats      *clientStats
 
-	newTowers        chan *newTowerMsg
-	staleTowers      chan *staleTowerMsg
-	deactivateTowers chan *deactivateTowerMsg
+	newTowers         chan *newTowerMsg
+	staleTowers       chan *staleTowerMsg
+	deactivateTowers  chan *deactivateTowerMsg
+	terminateSessions chan *terminateSessMsg
 
 	wg   sync.WaitGroup
 	quit chan struct{}
@@ -209,16 +223,17 @@ func newClient(cfg *clientCfg) (*client, error) {
 	}
 
 	c := &client{
-		cfg:              cfg,
-		log:              plog,
-		pipeline:         queue,
-		activeSessions:   newSessionQueueSet(),
-		statTicker:       time.NewTicker(DefaultStatInterval),
-		stats:            new(clientStats),
-		newTowers:        make(chan *newTowerMsg),
-		staleTowers:      make(chan *staleTowerMsg),
-		deactivateTowers: make(chan *deactivateTowerMsg),
-		quit:             make(chan struct{}),
+		cfg:               cfg,
+		log:               plog,
+		pipeline:          queue,
+		activeSessions:    newSessionQueueSet(),
+		statTicker:        time.NewTicker(DefaultStatInterval),
+		stats:             new(clientStats),
+		newTowers:         make(chan *newTowerMsg),
+		staleTowers:       make(chan *staleTowerMsg),
+		deactivateTowers:  make(chan *deactivateTowerMsg),
+		terminateSessions: make(chan *terminateSessMsg),
+		quit:              make(chan struct{}),
 	}
 
 	candidateTowers := newTowerListIterator()
@@ -718,6 +733,10 @@ func (c *client) backupDispatcher() {
 			case msg := <-c.deactivateTowers:
 				msg.errChan <- c.handleDeactivateTower(msg)
 
+			// A request has come through to terminate a session.
+			case msg := <-c.terminateSessions:
+				msg.errChan <- c.handleTerminateSession(msg)
+
 			case <-c.quit:
 				return
 			}
@@ -807,6 +826,10 @@ func (c *client) backupDispatcher() {
 			case msg := <-c.deactivateTowers:
 				msg.errChan <- c.handleDeactivateTower(msg)
 
+			// A request has come through to terminate a session.
+			case msg := <-c.terminateSessions:
+				msg.errChan <- c.handleTerminateSession(msg)
+
 			case <-c.quit:
 				return
 			}
@@ -1074,6 +1097,53 @@ func (c *client) initActiveQueue(s *ClientSession,
 	return sq
 }
 
+// terminateSession sets the given session's status to CSessionTerminal meaning
+// that it will not be used again.
+func (c *client) terminateSession(id wtdb.SessionID) error {
+	errChan := make(chan error, 1)
+
+	select {
+	case c.terminateSessions <- &terminateSessMsg{
+		id:      id,
+		errChan: errChan,
+	}:
+	case <-c.pipeline.quit:
+		return ErrClientExiting
+	}
+
+	select {
+	case err := <-errChan:
+		return err
+	case <-c.pipeline.quit:
+		return ErrClientExiting
+	}
+}
+
+// handleTerminateSession handles a request to terminate a session. It will
+// first shut down the session if it is part of the active session set, then
+// it will ensure that the active session queue is set reset if it is using the
+// session in question. Finally, the session's status in the DB will be updated.
+func (c *client) handleTerminateSession(msg *terminateSessMsg) error {
+	id := msg.id
+
+	delete(c.candidateSessions, id)
+
+	err := c.activeSessions.StopAndRemove(id, true)
+	if err != nil {
+		return fmt.Errorf("could not stop session %s: %w", id, err)
+	}
+
+	// If our active session queue corresponds to the session being
+	// terminated, then we'll proceed to negotiate a new one.
+	if c.sessionQueue != nil {
+		if bytes.Equal(c.sessionQueue.ID()[:], id[:]) {
+			c.sessionQueue = nil
+		}
+	}
+
+	return nil
+}
+
 // deactivateTower sends a tower deactivation request to the backupDispatcher
 // where it will be handled synchronously. The request should result in all the
 // sessions that we have with the given tower being shutdown and removed from
diff --git a/watchtower/wtclient/client_test.go b/watchtower/wtclient/client_test.go
index 0e5352f88..38d9acd9f 100644
--- a/watchtower/wtclient/client_test.go
+++ b/watchtower/wtclient/client_test.go
@@ -1034,15 +1034,19 @@ func (s *serverHarness) waitForUpdates(hints []blob.BreachHint,
 	// Closure to assert the server's matches are consistent with the hint
 	// set.
 	serverHasHints := func(matches []wtdb.Match) bool {
-		if len(hintSet) != len(matches) {
+		// De-dup the server matches since it might very well have
+		// multiple matches for a hint if that update was backed up on
+		// more than one session.
+		matchHints := make(map[blob.BreachHint]struct{})
+		for _, match := range matches {
+			matchHints[match.Hint] = struct{}{}
+		}
+
+		if len(hintSet) != len(matchHints) {
 			return false
 		}
 
-		for _, match := range matches {
-			_, ok := hintSet[match.Hint]
-			require.Truef(s.t, ok, "match %v in db is not in "+
-				"hint set", match.Hint)
-		}
+		require.EqualValues(s.t, hintSet, matchHints)
 
 		return true
 	}
@@ -2770,6 +2774,123 @@ var clientTests = []clientTest{
 			h.server.waitForUpdates(hints[numUpdates-1:], waitTime)
 		},
 	},
+	{
+		name: "terminate session",
+		cfg: harnessCfg{
+			localBalance:  localBalance,
+			remoteBalance: remoteBalance,
+			policy: wtpolicy.Policy{
+				TxPolicy:   defaultTxPolicy,
+				MaxUpdates: 5,
+			},
+		},
+		fn: func(h *testHarness) {
+			const (
+				numUpdates = 10
+				chanIDInt  = 0
+			)
+
+			// Advance the channel with a few updates.
+			hints := h.advanceChannelN(chanIDInt, numUpdates)
+
+			// Backup one of these updates and wait for it to
+			// arrive at the server.
+			h.backupStates(chanIDInt, 0, 1, nil)
+			h.server.waitForUpdates(hints[:1], waitTime)
+
+			// Now, restart the server in a state where it will not
+			// ack updates. This will allow us to wait for an update
+			// to be un-acked and persisted.
+			h.server.restart(func(cfg *wtserver.Config) {
+				cfg.NoAckUpdates = true
+			})
+
+			// Backup another update. These should remain in the
+			// client as un-acked.
+			h.backupStates(chanIDInt, 1, 2, nil)
+
+			// Wait for the update to be persisted.
+			fetchUnacked := h.clientDB.FetchSessionCommittedUpdates
+			var sessID wtdb.SessionID
+			err := wait.Predicate(func() bool {
+				sessions, err := h.clientDB.ListClientSessions(
+					nil,
+				)
+				require.NoError(h.t, err)
+
+				var updates []wtdb.CommittedUpdate
+				for id := range sessions {
+					sessID = id
+					updates, err = fetchUnacked(&id)
+					require.NoError(h.t, err)
+
+					return len(updates) == 1
+				}
+
+				return false
+			}, waitTime)
+			require.NoError(h.t, err)
+
+			// Now try to terminate the session by directly calling
+			// the DB terminate method. This is expected to fail
+			// since the session still has un-acked updates.
+			err = h.clientDB.TerminateSession(sessID)
+			require.ErrorIs(
+				h.t, err, wtdb.ErrSessionHasUnackedUpdates,
+			)
+
+			// If we try to terminate the session through the client
+			// interface though, it should succeed since the client
+			// will handle the un-acked updates of the session.
+			err = h.clientMgr.TerminateSession(sessID)
+			require.NoError(h.t, err)
+
+			// Fetch the session from the DB and assert that it is
+			// in the terminal state and that it is not exhausted.
+			sess, err := h.clientDB.GetClientSession(sessID)
+			require.NoError(h.t, err)
+
+			require.Equal(h.t, wtdb.CSessionTerminal, sess.Status)
+			require.NotEqual(
+				h.t, sess.Policy.MaxUpdates, sess.SeqNum,
+			)
+
+			// Restart the server and allow it to ack updates again.
+			h.server.restart(func(cfg *wtserver.Config) {
+				cfg.NoAckUpdates = false
+			})
+
+			// Wait for the update from before to appear on the
+			// server. The server will actually have this back-up
+			// stored twice now since it would have stored it for
+			// the first session even though it did not send an ACK
+			// for it.
+			h.server.waitForUpdates(hints[1:2], waitTime)
+
+			// Now we want to assert that this update was definitely
+			// not sent on the terminated session but was instead
+			// sent in a new session.
+			var (
+				updateCounts = make(map[wtdb.SessionID]uint16)
+				totalUpdates uint16
+			)
+			sessions, err := h.clientDB.ListClientSessions(nil,
+				wtdb.WithPerNumAckedUpdates(
+					func(s *wtdb.ClientSession,
+						_ lnwire.ChannelID,
+						num uint16) {
+
+						updateCounts[s.ID] += num
+						totalUpdates += num
+					},
+				),
+			)
+			require.NoError(h.t, err)
+			require.Len(h.t, sessions, 2)
+			require.EqualValues(h.t, 1, updateCounts[sessID])
+			require.EqualValues(h.t, 2, totalUpdates)
+		},
+	},
 }
 
 // TestClient executes the client test suite, asserting the ability to backup
diff --git a/watchtower/wtclient/manager.go b/watchtower/wtclient/manager.go
index 17a351c15..f1cae979f 100644
--- a/watchtower/wtclient/manager.go
+++ b/watchtower/wtclient/manager.go
@@ -43,6 +43,10 @@ type ClientManager interface {
 	// be used while the tower is inactive.
 	DeactivateTower(pubKey *btcec.PublicKey) error
 
+	// TerminateSession sets the given session's status to CSessionTerminal
+	// meaning that it will not be used again.
+	TerminateSession(id wtdb.SessionID) error
+
 	// Stats returns the in-memory statistics of the client since startup.
 	Stats() ClientStats
 
@@ -436,6 +440,23 @@ func (m *Manager) RemoveTower(key *btcec.PublicKey, addr net.Addr) error {
 	return nil
 }
 
+// TerminateSession sets the given session's status to CSessionTerminal meaning
+// that it will not be used again.
+func (m *Manager) TerminateSession(id wtdb.SessionID) error {
+	m.clientsMu.Lock()
+	defer m.clientsMu.Unlock()
+
+	for _, client := range m.clients {
+		err := client.terminateSession(id)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Finally, mark the session as terminated in the DB.
+	return m.cfg.DB.TerminateSession(id)
+}
+
 // DeactivateTower sets the given tower's status to inactive so that it is not
 // considered for session negotiation. Its sessions will also not be used while
 // the tower is inactive.

From 5d16491c13626c5c44c96fe70a9c82b14077a3cd Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Wed, 29 Nov 2023 11:06:07 +0200
Subject: [PATCH 12/18] lnrpc+lncli: add TerminateSession command

---
 cmd/lncli/wtclient.go                         |  48 +-
 lnrpc/wtclientrpc/watchtowerclient.pb.json.go |  25 +
 lnrpc/wtclientrpc/wtclient.go                 |  31 +
 lnrpc/wtclientrpc/wtclient.pb.go              | 567 +++++++++++-------
 lnrpc/wtclientrpc/wtclient.pb.gw.go           |  99 +++
 lnrpc/wtclientrpc/wtclient.proto              |  17 +
 lnrpc/wtclientrpc/wtclient.swagger.json       |  42 ++
 lnrpc/wtclientrpc/wtclient.yaml               |   2 +
 lnrpc/wtclientrpc/wtclient_grpc.pb.go         |  42 ++
 9 files changed, 657 insertions(+), 216 deletions(-)

diff --git a/cmd/lncli/wtclient.go b/cmd/lncli/wtclient.go
index 488e828b9..ac844ef45 100644
--- a/cmd/lncli/wtclient.go
+++ b/cmd/lncli/wtclient.go
@@ -10,7 +10,8 @@ import (
 	"github.com/urfave/cli"
 )
 
-// wtclientCommands will return nil for non-wtclientrpc builds.
+// wtclientCommands is a list of commands that can be used to interact with the
+// watchtower client.
 func wtclientCommands() []cli.Command {
 	return []cli.Command{
 		{
@@ -25,6 +26,7 @@ func wtclientCommands() []cli.Command {
 				getTowerCommand,
 				statsCommand,
 				policyCommand,
+				sessionCommands,
 			},
 		},
 	}
@@ -372,3 +374,47 @@ func policy(ctx *cli.Context) error {
 	printRespJSON(resp)
 	return nil
 }
+
+var sessionCommands = cli.Command{
+	Name: "session",
+	Subcommands: []cli.Command{
+		terminateSessionCommand,
+	},
+}
+
+var terminateSessionCommand = cli.Command{
+	Name:      "terminate",
+	ArgsUsage: "id",
+	Action:    actionDecorator(terminateSession),
+}
+
+func terminateSession(ctx *cli.Context) error {
+	ctxc := getContext()
+
+	// Display the command's help message if the number of arguments/flags
+	// is not what we expect.
+	if ctx.NArg() > 1 || ctx.NumFlags() != 0 {
+		return cli.ShowCommandHelp(ctx, "terminate")
+	}
+
+	client, cleanUp := getWtclient(ctx)
+	defer cleanUp()
+
+	sessionID, err := hex.DecodeString(ctx.Args().First())
+	if err != nil {
+		return fmt.Errorf("invalid session ID: %w", err)
+	}
+
+	resp, err := client.TerminateSession(
+		ctxc, &wtclientrpc.TerminateSessionRequest{
+			SessionId: sessionID,
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	printRespJSON(resp)
+
+	return nil
+}
diff --git a/lnrpc/wtclientrpc/watchtowerclient.pb.json.go b/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
index 338c65331..f9773c5d9 100644
--- a/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
+++ b/lnrpc/wtclientrpc/watchtowerclient.pb.json.go
@@ -96,6 +96,31 @@ func RegisterWatchtowerClientJSONCallbacks(registry map[string]func(ctx context.
 		callback(string(respBytes), nil)
 	}
 
+	registry["wtclientrpc.WatchtowerClient.TerminateSession"] = func(ctx context.Context,
+		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
+
+		req := &TerminateSessionRequest{}
+		err := marshaler.Unmarshal([]byte(reqJSON), req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		client := NewWatchtowerClientClient(conn)
+		resp, err := client.TerminateSession(ctx, req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		respBytes, err := marshaler.Marshal(resp)
+		if err != nil {
+			callback("", err)
+			return
+		}
+		callback(string(respBytes), nil)
+	}
+
 	registry["wtclientrpc.WatchtowerClient.ListTowers"] = func(ctx context.Context,
 		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
 
diff --git a/lnrpc/wtclientrpc/wtclient.go b/lnrpc/wtclientrpc/wtclient.go
index 045a01b57..8e9de23b7 100644
--- a/lnrpc/wtclientrpc/wtclient.go
+++ b/lnrpc/wtclientrpc/wtclient.go
@@ -48,6 +48,10 @@ var (
 			Entity: "offchain",
 			Action: "write",
 		}},
+		"/wtclientrpc.WatchtowerClient/TerminateSession": {{
+			Entity: "offchain",
+			Action: "write",
+		}},
 		"/wtclientrpc.WatchtowerClient/ListTowers": {{
 			Entity: "offchain",
 			Action: "read",
@@ -281,6 +285,33 @@ func (c *WatchtowerClient) DeactivateTower(_ context.Context,
 	}, nil
 }
 
+// TerminateSession terminates the given session and marks it as terminal so
+// that it is never used again.
+func (c *WatchtowerClient) TerminateSession(_ context.Context,
+	req *TerminateSessionRequest) (*TerminateSessionResponse, error) {
+
+	if err := c.isActive(); err != nil {
+		return nil, err
+	}
+
+	pubKey, err := btcec.ParsePubKey(req.SessionId)
+	if err != nil {
+		return nil, err
+	}
+
+	sessionID := wtdb.NewSessionIDFromPubKey(pubKey)
+
+	err = c.cfg.ClientMgr.TerminateSession(sessionID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TerminateSessionResponse{
+		Status: fmt.Sprintf("Successful termination of session: %s",
+			sessionID),
+	}, nil
+}
+
 // ListTowers returns the list of watchtowers registered with the client.
 func (c *WatchtowerClient) ListTowers(ctx context.Context,
 	req *ListTowersRequest) (*ListTowersResponse, error) {
diff --git a/lnrpc/wtclientrpc/wtclient.pb.go b/lnrpc/wtclientrpc/wtclient.pb.go
index 32f124fee..e9bd28610 100644
--- a/lnrpc/wtclientrpc/wtclient.pb.go
+++ b/lnrpc/wtclientrpc/wtclient.pb.go
@@ -360,6 +360,102 @@ func (x *DeactivateTowerResponse) GetStatus() string {
 	return ""
 }
 
+type TerminateSessionRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The ID of the session that should be terminated.
+	SessionId []byte `protobuf:"bytes,1,opt,name=session_id,json=sessionId,proto3" json:"session_id,omitempty"`
+}
+
+func (x *TerminateSessionRequest) Reset() {
+	*x = TerminateSessionRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TerminateSessionRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TerminateSessionRequest) ProtoMessage() {}
+
+func (x *TerminateSessionRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TerminateSessionRequest.ProtoReflect.Descriptor instead.
+func (*TerminateSessionRequest) Descriptor() ([]byte, []int) {
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *TerminateSessionRequest) GetSessionId() []byte {
+	if x != nil {
+		return x.SessionId
+	}
+	return nil
+}
+
+type TerminateSessionResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A string describing the action that took place.
+	Status string `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+}
+
+func (x *TerminateSessionResponse) Reset() {
+	*x = TerminateSessionResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TerminateSessionResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TerminateSessionResponse) ProtoMessage() {}
+
+func (x *TerminateSessionResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TerminateSessionResponse.ProtoReflect.Descriptor instead.
+func (*TerminateSessionResponse) Descriptor() ([]byte, []int) {
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *TerminateSessionResponse) GetStatus() string {
+	if x != nil {
+		return x.Status
+	}
+	return ""
+}
+
 type GetTowerInfoRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -377,7 +473,7 @@ type GetTowerInfoRequest struct {
 func (x *GetTowerInfoRequest) Reset() {
 	*x = GetTowerInfoRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -390,7 +486,7 @@ func (x *GetTowerInfoRequest) String() string {
 func (*GetTowerInfoRequest) ProtoMessage() {}
 
 func (x *GetTowerInfoRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[6]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -403,7 +499,7 @@ func (x *GetTowerInfoRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetTowerInfoRequest.ProtoReflect.Descriptor instead.
 func (*GetTowerInfoRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{6}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *GetTowerInfoRequest) GetPubkey() []byte {
@@ -454,7 +550,7 @@ type TowerSession struct {
 func (x *TowerSession) Reset() {
 	*x = TowerSession{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -467,7 +563,7 @@ func (x *TowerSession) String() string {
 func (*TowerSession) ProtoMessage() {}
 
 func (x *TowerSession) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[7]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -480,7 +576,7 @@ func (x *TowerSession) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TowerSession.ProtoReflect.Descriptor instead.
 func (*TowerSession) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{7}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *TowerSession) GetNumBackups() uint32 {
@@ -553,7 +649,7 @@ type Tower struct {
 func (x *Tower) Reset() {
 	*x = Tower{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -566,7 +662,7 @@ func (x *Tower) String() string {
 func (*Tower) ProtoMessage() {}
 
 func (x *Tower) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[8]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -579,7 +675,7 @@ func (x *Tower) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Tower.ProtoReflect.Descriptor instead.
 func (*Tower) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{8}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *Tower) GetPubkey() []byte {
@@ -645,7 +741,7 @@ type TowerSessionInfo struct {
 func (x *TowerSessionInfo) Reset() {
 	*x = TowerSessionInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -658,7 +754,7 @@ func (x *TowerSessionInfo) String() string {
 func (*TowerSessionInfo) ProtoMessage() {}
 
 func (x *TowerSessionInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[9]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -671,7 +767,7 @@ func (x *TowerSessionInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TowerSessionInfo.ProtoReflect.Descriptor instead.
 func (*TowerSessionInfo) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{9}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *TowerSessionInfo) GetActiveSessionCandidate() bool {
@@ -717,7 +813,7 @@ type ListTowersRequest struct {
 func (x *ListTowersRequest) Reset() {
 	*x = ListTowersRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -730,7 +826,7 @@ func (x *ListTowersRequest) String() string {
 func (*ListTowersRequest) ProtoMessage() {}
 
 func (x *ListTowersRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[10]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -743,7 +839,7 @@ func (x *ListTowersRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListTowersRequest.ProtoReflect.Descriptor instead.
 func (*ListTowersRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{10}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *ListTowersRequest) GetIncludeSessions() bool {
@@ -772,7 +868,7 @@ type ListTowersResponse struct {
 func (x *ListTowersResponse) Reset() {
 	*x = ListTowersResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -785,7 +881,7 @@ func (x *ListTowersResponse) String() string {
 func (*ListTowersResponse) ProtoMessage() {}
 
 func (x *ListTowersResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[11]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -798,7 +894,7 @@ func (x *ListTowersResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListTowersResponse.ProtoReflect.Descriptor instead.
 func (*ListTowersResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{11}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *ListTowersResponse) GetTowers() []*Tower {
@@ -817,7 +913,7 @@ type StatsRequest struct {
 func (x *StatsRequest) Reset() {
 	*x = StatsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -830,7 +926,7 @@ func (x *StatsRequest) String() string {
 func (*StatsRequest) ProtoMessage() {}
 
 func (x *StatsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[12]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -843,7 +939,7 @@ func (x *StatsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StatsRequest.ProtoReflect.Descriptor instead.
 func (*StatsRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{12}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{14}
 }
 
 type StatsResponse struct {
@@ -869,7 +965,7 @@ type StatsResponse struct {
 func (x *StatsResponse) Reset() {
 	*x = StatsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -882,7 +978,7 @@ func (x *StatsResponse) String() string {
 func (*StatsResponse) ProtoMessage() {}
 
 func (x *StatsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[13]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -895,7 +991,7 @@ func (x *StatsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StatsResponse.ProtoReflect.Descriptor instead.
 func (*StatsResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{13}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *StatsResponse) GetNumBackups() uint32 {
@@ -945,7 +1041,7 @@ type PolicyRequest struct {
 func (x *PolicyRequest) Reset() {
 	*x = PolicyRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -958,7 +1054,7 @@ func (x *PolicyRequest) String() string {
 func (*PolicyRequest) ProtoMessage() {}
 
 func (x *PolicyRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[14]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -971,7 +1067,7 @@ func (x *PolicyRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PolicyRequest.ProtoReflect.Descriptor instead.
 func (*PolicyRequest) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{14}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *PolicyRequest) GetPolicyType() PolicyType {
@@ -1003,7 +1099,7 @@ type PolicyResponse struct {
 func (x *PolicyResponse) Reset() {
 	*x = PolicyResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
+		mi := &file_wtclientrpc_wtclient_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1016,7 +1112,7 @@ func (x *PolicyResponse) String() string {
 func (*PolicyResponse) ProtoMessage() {}
 
 func (x *PolicyResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_wtclientrpc_wtclient_proto_msgTypes[15]
+	mi := &file_wtclientrpc_wtclient_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1029,7 +1125,7 @@ func (x *PolicyResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PolicyResponse.ProtoReflect.Descriptor instead.
 func (*PolicyResponse) Descriptor() ([]byte, []int) {
-	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{15}
+	return file_wtclientrpc_wtclient_proto_rawDescGZIP(), []int{17}
 }
 
 func (x *PolicyResponse) GetMaxUpdates() uint32 {
@@ -1077,147 +1173,160 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
 	0x6b, 0x65, 0x79, 0x22, 0x31, 0x0a, 0x17, 0x44, 0x65, 0x61, 0x63, 0x74, 0x69, 0x76, 0x61, 0x74,
 	0x65, 0x54, 0x6f, 0x77, 0x65, 0x72, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x16,
 	0x0a, 0x06, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06,
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-	0x77, 0x65, 0x72, 0x49, 0x6e, 0x66, 0x6f, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x16,
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+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1233,49 +1342,53 @@ func file_wtclientrpc_wtclient_proto_rawDescGZIP() []byte {
 }
 
 var file_wtclientrpc_wtclient_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_wtclientrpc_wtclient_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
+var file_wtclientrpc_wtclient_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
 var file_wtclientrpc_wtclient_proto_goTypes = []interface{}{
-	(PolicyType)(0),                 // 0: wtclientrpc.PolicyType
-	(*AddTowerRequest)(nil),         // 1: wtclientrpc.AddTowerRequest
-	(*AddTowerResponse)(nil),        // 2: wtclientrpc.AddTowerResponse
-	(*RemoveTowerRequest)(nil),      // 3: wtclientrpc.RemoveTowerRequest
-	(*RemoveTowerResponse)(nil),     // 4: wtclientrpc.RemoveTowerResponse
-	(*DeactivateTowerRequest)(nil),  // 5: wtclientrpc.DeactivateTowerRequest
-	(*DeactivateTowerResponse)(nil), // 6: wtclientrpc.DeactivateTowerResponse
-	(*GetTowerInfoRequest)(nil),     // 7: wtclientrpc.GetTowerInfoRequest
-	(*TowerSession)(nil),            // 8: wtclientrpc.TowerSession
-	(*Tower)(nil),                   // 9: wtclientrpc.Tower
-	(*TowerSessionInfo)(nil),        // 10: wtclientrpc.TowerSessionInfo
-	(*ListTowersRequest)(nil),       // 11: wtclientrpc.ListTowersRequest
-	(*ListTowersResponse)(nil),      // 12: wtclientrpc.ListTowersResponse
-	(*StatsRequest)(nil),            // 13: wtclientrpc.StatsRequest
-	(*StatsResponse)(nil),           // 14: wtclientrpc.StatsResponse
-	(*PolicyRequest)(nil),           // 15: wtclientrpc.PolicyRequest
-	(*PolicyResponse)(nil),          // 16: wtclientrpc.PolicyResponse
+	(PolicyType)(0),                  // 0: wtclientrpc.PolicyType
+	(*AddTowerRequest)(nil),          // 1: wtclientrpc.AddTowerRequest
+	(*AddTowerResponse)(nil),         // 2: wtclientrpc.AddTowerResponse
+	(*RemoveTowerRequest)(nil),       // 3: wtclientrpc.RemoveTowerRequest
+	(*RemoveTowerResponse)(nil),      // 4: wtclientrpc.RemoveTowerResponse
+	(*DeactivateTowerRequest)(nil),   // 5: wtclientrpc.DeactivateTowerRequest
+	(*DeactivateTowerResponse)(nil),  // 6: wtclientrpc.DeactivateTowerResponse
+	(*TerminateSessionRequest)(nil),  // 7: wtclientrpc.TerminateSessionRequest
+	(*TerminateSessionResponse)(nil), // 8: wtclientrpc.TerminateSessionResponse
+	(*GetTowerInfoRequest)(nil),      // 9: wtclientrpc.GetTowerInfoRequest
+	(*TowerSession)(nil),             // 10: wtclientrpc.TowerSession
+	(*Tower)(nil),                    // 11: wtclientrpc.Tower
+	(*TowerSessionInfo)(nil),         // 12: wtclientrpc.TowerSessionInfo
+	(*ListTowersRequest)(nil),        // 13: wtclientrpc.ListTowersRequest
+	(*ListTowersResponse)(nil),       // 14: wtclientrpc.ListTowersResponse
+	(*StatsRequest)(nil),             // 15: wtclientrpc.StatsRequest
+	(*StatsResponse)(nil),            // 16: wtclientrpc.StatsResponse
+	(*PolicyRequest)(nil),            // 17: wtclientrpc.PolicyRequest
+	(*PolicyResponse)(nil),           // 18: wtclientrpc.PolicyResponse
 }
 var file_wtclientrpc_wtclient_proto_depIdxs = []int32{
-	8,  // 0: wtclientrpc.Tower.sessions:type_name -> wtclientrpc.TowerSession
-	10, // 1: wtclientrpc.Tower.session_info:type_name -> wtclientrpc.TowerSessionInfo
-	8,  // 2: wtclientrpc.TowerSessionInfo.sessions:type_name -> wtclientrpc.TowerSession
+	10, // 0: wtclientrpc.Tower.sessions:type_name -> wtclientrpc.TowerSession
+	12, // 1: wtclientrpc.Tower.session_info:type_name -> wtclientrpc.TowerSessionInfo
+	10, // 2: wtclientrpc.TowerSessionInfo.sessions:type_name -> wtclientrpc.TowerSession
 	0,  // 3: wtclientrpc.TowerSessionInfo.policy_type:type_name -> wtclientrpc.PolicyType
-	9,  // 4: wtclientrpc.ListTowersResponse.towers:type_name -> wtclientrpc.Tower
+	11, // 4: wtclientrpc.ListTowersResponse.towers:type_name -> wtclientrpc.Tower
 	0,  // 5: wtclientrpc.PolicyRequest.policy_type:type_name -> wtclientrpc.PolicyType
 	1,  // 6: wtclientrpc.WatchtowerClient.AddTower:input_type -> wtclientrpc.AddTowerRequest
 	3,  // 7: wtclientrpc.WatchtowerClient.RemoveTower:input_type -> wtclientrpc.RemoveTowerRequest
 	5,  // 8: wtclientrpc.WatchtowerClient.DeactivateTower:input_type -> wtclientrpc.DeactivateTowerRequest
-	11, // 9: wtclientrpc.WatchtowerClient.ListTowers:input_type -> wtclientrpc.ListTowersRequest
-	7,  // 10: wtclientrpc.WatchtowerClient.GetTowerInfo:input_type -> wtclientrpc.GetTowerInfoRequest
-	13, // 11: wtclientrpc.WatchtowerClient.Stats:input_type -> wtclientrpc.StatsRequest
-	15, // 12: wtclientrpc.WatchtowerClient.Policy:input_type -> wtclientrpc.PolicyRequest
-	2,  // 13: wtclientrpc.WatchtowerClient.AddTower:output_type -> wtclientrpc.AddTowerResponse
-	4,  // 14: wtclientrpc.WatchtowerClient.RemoveTower:output_type -> wtclientrpc.RemoveTowerResponse
-	6,  // 15: wtclientrpc.WatchtowerClient.DeactivateTower:output_type -> wtclientrpc.DeactivateTowerResponse
-	12, // 16: wtclientrpc.WatchtowerClient.ListTowers:output_type -> wtclientrpc.ListTowersResponse
-	9,  // 17: wtclientrpc.WatchtowerClient.GetTowerInfo:output_type -> wtclientrpc.Tower
-	14, // 18: wtclientrpc.WatchtowerClient.Stats:output_type -> wtclientrpc.StatsResponse
-	16, // 19: wtclientrpc.WatchtowerClient.Policy:output_type -> wtclientrpc.PolicyResponse
-	13, // [13:20] is the sub-list for method output_type
-	6,  // [6:13] is the sub-list for method input_type
+	7,  // 9: wtclientrpc.WatchtowerClient.TerminateSession:input_type -> wtclientrpc.TerminateSessionRequest
+	13, // 10: wtclientrpc.WatchtowerClient.ListTowers:input_type -> wtclientrpc.ListTowersRequest
+	9,  // 11: wtclientrpc.WatchtowerClient.GetTowerInfo:input_type -> wtclientrpc.GetTowerInfoRequest
+	15, // 12: wtclientrpc.WatchtowerClient.Stats:input_type -> wtclientrpc.StatsRequest
+	17, // 13: wtclientrpc.WatchtowerClient.Policy:input_type -> wtclientrpc.PolicyRequest
+	2,  // 14: wtclientrpc.WatchtowerClient.AddTower:output_type -> wtclientrpc.AddTowerResponse
+	4,  // 15: wtclientrpc.WatchtowerClient.RemoveTower:output_type -> wtclientrpc.RemoveTowerResponse
+	6,  // 16: wtclientrpc.WatchtowerClient.DeactivateTower:output_type -> wtclientrpc.DeactivateTowerResponse
+	8,  // 17: wtclientrpc.WatchtowerClient.TerminateSession:output_type -> wtclientrpc.TerminateSessionResponse
+	14, // 18: wtclientrpc.WatchtowerClient.ListTowers:output_type -> wtclientrpc.ListTowersResponse
+	11, // 19: wtclientrpc.WatchtowerClient.GetTowerInfo:output_type -> wtclientrpc.Tower
+	16, // 20: wtclientrpc.WatchtowerClient.Stats:output_type -> wtclientrpc.StatsResponse
+	18, // 21: wtclientrpc.WatchtowerClient.Policy:output_type -> wtclientrpc.PolicyResponse
+	14, // [14:22] is the sub-list for method output_type
+	6,  // [6:14] is the sub-list for method input_type
 	6,  // [6:6] is the sub-list for extension type_name
 	6,  // [6:6] is the sub-list for extension extendee
 	0,  // [0:6] is the sub-list for field type_name
@@ -1360,7 +1473,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetTowerInfoRequest); i {
+			switch v := v.(*TerminateSessionRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1372,7 +1485,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TowerSession); i {
+			switch v := v.(*TerminateSessionResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1384,7 +1497,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Tower); i {
+			switch v := v.(*GetTowerInfoRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1396,7 +1509,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TowerSessionInfo); i {
+			switch v := v.(*TowerSession); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1408,7 +1521,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListTowersRequest); i {
+			switch v := v.(*Tower); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1420,7 +1533,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListTowersResponse); i {
+			switch v := v.(*TowerSessionInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1432,7 +1545,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StatsRequest); i {
+			switch v := v.(*ListTowersRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1444,7 +1557,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StatsResponse); i {
+			switch v := v.(*ListTowersResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1456,7 +1569,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PolicyRequest); i {
+			switch v := v.(*StatsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1468,6 +1581,30 @@ func file_wtclientrpc_wtclient_proto_init() {
 			}
 		}
 		file_wtclientrpc_wtclient_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StatsResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_wtclientrpc_wtclient_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PolicyRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_wtclientrpc_wtclient_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*PolicyResponse); i {
 			case 0:
 				return &v.state
@@ -1486,7 +1623,7 @@ func file_wtclientrpc_wtclient_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_wtclientrpc_wtclient_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   16,
+			NumMessages:   18,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/lnrpc/wtclientrpc/wtclient.pb.gw.go b/lnrpc/wtclientrpc/wtclient.pb.gw.go
index f3d3e70de..b441437fa 100644
--- a/lnrpc/wtclientrpc/wtclient.pb.gw.go
+++ b/lnrpc/wtclientrpc/wtclient.pb.gw.go
@@ -187,6 +187,58 @@ func local_request_WatchtowerClient_DeactivateTower_0(ctx context.Context, marsh
 
 }
 
+func request_WatchtowerClient_TerminateSession_0(ctx context.Context, marshaler runtime.Marshaler, client WatchtowerClientClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq TerminateSessionRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["session_id"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "session_id")
+	}
+
+	protoReq.SessionId, err = runtime.Bytes(val)
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "session_id", err)
+	}
+
+	msg, err := client.TerminateSession(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_WatchtowerClient_TerminateSession_0(ctx context.Context, marshaler runtime.Marshaler, server WatchtowerClientServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq TerminateSessionRequest
+	var metadata runtime.ServerMetadata
+
+	var (
+		val string
+		ok  bool
+		err error
+		_   = err
+	)
+
+	val, ok = pathParams["session_id"]
+	if !ok {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "session_id")
+	}
+
+	protoReq.SessionId, err = runtime.Bytes(val)
+	if err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "session_id", err)
+	}
+
+	msg, err := server.TerminateSession(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
 var (
 	filter_WatchtowerClient_ListTowers_0 = &utilities.DoubleArray{Encoding: map[string]int{}, Base: []int(nil), Check: []int(nil)}
 )
@@ -422,6 +474,29 @@ func RegisterWatchtowerClientHandlerServer(ctx context.Context, mux *runtime.Ser
 
 	})
 
+	mux.Handle("POST", pattern_WatchtowerClient_TerminateSession_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req, "/wtclientrpc.WatchtowerClient/TerminateSession", runtime.WithHTTPPathPattern("/v2/watchtower/client/sessions/terminate/{session_id}"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_WatchtowerClient_TerminateSession_0(rctx, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WatchtowerClient_TerminateSession_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	mux.Handle("GET", pattern_WatchtowerClient_ListTowers_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
 		ctx, cancel := context.WithCancel(req.Context())
 		defer cancel()
@@ -615,6 +690,26 @@ func RegisterWatchtowerClientHandlerClient(ctx context.Context, mux *runtime.Ser
 
 	})
 
+	mux.Handle("POST", pattern_WatchtowerClient_TerminateSession_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req, "/wtclientrpc.WatchtowerClient/TerminateSession", runtime.WithHTTPPathPattern("/v2/watchtower/client/sessions/terminate/{session_id}"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_WatchtowerClient_TerminateSession_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_WatchtowerClient_TerminateSession_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	mux.Handle("GET", pattern_WatchtowerClient_ListTowers_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
 		ctx, cancel := context.WithCancel(req.Context())
 		defer cancel()
@@ -705,6 +800,8 @@ var (
 
 	pattern_WatchtowerClient_DeactivateTower_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3, 2, 4, 1, 0, 4, 1, 5, 5}, []string{"v2", "watchtower", "client", "tower", "deactivate", "pubkey"}, ""))
 
+	pattern_WatchtowerClient_TerminateSession_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3, 2, 4, 1, 0, 4, 1, 5, 5}, []string{"v2", "watchtower", "client", "sessions", "terminate", "session_id"}, ""))
+
 	pattern_WatchtowerClient_ListTowers_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v2", "watchtower", "client"}, ""))
 
 	pattern_WatchtowerClient_GetTowerInfo_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3, 1, 0, 4, 1, 5, 4}, []string{"v2", "watchtower", "client", "info", "pubkey"}, ""))
@@ -721,6 +818,8 @@ var (
 
 	forward_WatchtowerClient_DeactivateTower_0 = runtime.ForwardResponseMessage
 
+	forward_WatchtowerClient_TerminateSession_0 = runtime.ForwardResponseMessage
+
 	forward_WatchtowerClient_ListTowers_0 = runtime.ForwardResponseMessage
 
 	forward_WatchtowerClient_GetTowerInfo_0 = runtime.ForwardResponseMessage
diff --git a/lnrpc/wtclientrpc/wtclient.proto b/lnrpc/wtclientrpc/wtclient.proto
index b0bf53cf0..3272d0951 100644
--- a/lnrpc/wtclientrpc/wtclient.proto
+++ b/lnrpc/wtclientrpc/wtclient.proto
@@ -49,6 +49,13 @@ service WatchtowerClient {
     rpc DeactivateTower (DeactivateTowerRequest)
         returns (DeactivateTowerResponse);
 
+    /* lncli: `wtclient session terminate`
+    Terminate terminates the given session and marks it as terminal so that
+    it is not used for backups anymore.
+    */
+    rpc TerminateSession (TerminateSessionRequest)
+        returns (TerminateSessionResponse);
+
     /* lncli: `wtclient towers`
     ListTowers returns the list of watchtowers registered with the client.
     */
@@ -106,6 +113,16 @@ message DeactivateTowerResponse {
     string status = 1;
 }
 
+message TerminateSessionRequest {
+    // The ID of the session that should be terminated.
+    bytes session_id = 1;
+}
+
+message TerminateSessionResponse {
+    // A string describing the action that took place.
+    string status = 1;
+}
+
 message GetTowerInfoRequest {
     // The identifying public key of the watchtower to retrieve information for.
     bytes pubkey = 1;
diff --git a/lnrpc/wtclientrpc/wtclient.swagger.json b/lnrpc/wtclientrpc/wtclient.swagger.json
index bef43e944..676f183bc 100644
--- a/lnrpc/wtclientrpc/wtclient.swagger.json
+++ b/lnrpc/wtclientrpc/wtclient.swagger.json
@@ -171,6 +171,39 @@
         ]
       }
     },
+    "/v2/watchtower/client/sessions/terminate/{session_id}": {
+      "post": {
+        "summary": "lncli: `wtclient session terminate`\nTerminate terminates the given session and marks it as terminal so that\nit is not used for backups anymore.",
+        "operationId": "WatchtowerClient_TerminateSession",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/wtclientrpcTerminateSessionResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "session_id",
+            "description": "The ID of the session that should be terminated.",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "format": "byte"
+          }
+        ],
+        "tags": [
+          "WatchtowerClient"
+        ]
+      }
+    },
     "/v2/watchtower/client/stats": {
       "get": {
         "summary": "lncli: `wtclient stats`\nStats returns the in-memory statistics of the client since startup.",
@@ -400,6 +433,15 @@
         }
       }
     },
+    "wtclientrpcTerminateSessionResponse": {
+      "type": "object",
+      "properties": {
+        "status": {
+          "type": "string",
+          "description": "A string describing the action that took place."
+        }
+      }
+    },
     "wtclientrpcTower": {
       "type": "object",
       "properties": {
diff --git a/lnrpc/wtclientrpc/wtclient.yaml b/lnrpc/wtclientrpc/wtclient.yaml
index 6f02969dd..55850a304 100644
--- a/lnrpc/wtclientrpc/wtclient.yaml
+++ b/lnrpc/wtclientrpc/wtclient.yaml
@@ -10,6 +10,8 @@ http:
       delete: "/v2/watchtower/client/{pubkey}"
     - selector: wtclientrpc.WatchtowerClient.DeactivateTower
       post: "/v2/watchtower/client/tower/deactivate/{pubkey}"
+    - selector: wtclientrpc.WatchtowerClient.TerminateSession
+      post: "/v2/watchtower/client/sessions/terminate/{session_id}"
     - selector: wtclientrpc.WatchtowerClient.ListTowers
       get: "/v2/watchtower/client"
     - selector: wtclientrpc.WatchtowerClient.GetTowerInfo
diff --git a/lnrpc/wtclientrpc/wtclient_grpc.pb.go b/lnrpc/wtclientrpc/wtclient_grpc.pb.go
index 86347ebf3..d22ef01fb 100644
--- a/lnrpc/wtclientrpc/wtclient_grpc.pb.go
+++ b/lnrpc/wtclientrpc/wtclient_grpc.pb.go
@@ -35,6 +35,10 @@ type WatchtowerClientClient interface {
 	// is not considered for session negotiation. Its sessions will also not
 	// be used while the tower is inactive.
 	DeactivateTower(ctx context.Context, in *DeactivateTowerRequest, opts ...grpc.CallOption) (*DeactivateTowerResponse, error)
+	// lncli: `wtclient session terminate`
+	// Terminate terminates the given session and marks it as terminal so that
+	// it is not used for backups anymore.
+	TerminateSession(ctx context.Context, in *TerminateSessionRequest, opts ...grpc.CallOption) (*TerminateSessionResponse, error)
 	// lncli: `wtclient towers`
 	// ListTowers returns the list of watchtowers registered with the client.
 	ListTowers(ctx context.Context, in *ListTowersRequest, opts ...grpc.CallOption) (*ListTowersResponse, error)
@@ -84,6 +88,15 @@ func (c *watchtowerClientClient) DeactivateTower(ctx context.Context, in *Deacti
 	return out, nil
 }
 
+func (c *watchtowerClientClient) TerminateSession(ctx context.Context, in *TerminateSessionRequest, opts ...grpc.CallOption) (*TerminateSessionResponse, error) {
+	out := new(TerminateSessionResponse)
+	err := c.cc.Invoke(ctx, "/wtclientrpc.WatchtowerClient/TerminateSession", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *watchtowerClientClient) ListTowers(ctx context.Context, in *ListTowersRequest, opts ...grpc.CallOption) (*ListTowersResponse, error) {
 	out := new(ListTowersResponse)
 	err := c.cc.Invoke(ctx, "/wtclientrpc.WatchtowerClient/ListTowers", in, out, opts...)
@@ -141,6 +154,10 @@ type WatchtowerClientServer interface {
 	// is not considered for session negotiation. Its sessions will also not
 	// be used while the tower is inactive.
 	DeactivateTower(context.Context, *DeactivateTowerRequest) (*DeactivateTowerResponse, error)
+	// lncli: `wtclient session terminate`
+	// Terminate terminates the given session and marks it as terminal so that
+	// it is not used for backups anymore.
+	TerminateSession(context.Context, *TerminateSessionRequest) (*TerminateSessionResponse, error)
 	// lncli: `wtclient towers`
 	// ListTowers returns the list of watchtowers registered with the client.
 	ListTowers(context.Context, *ListTowersRequest) (*ListTowersResponse, error)
@@ -169,6 +186,9 @@ func (UnimplementedWatchtowerClientServer) RemoveTower(context.Context, *RemoveT
 func (UnimplementedWatchtowerClientServer) DeactivateTower(context.Context, *DeactivateTowerRequest) (*DeactivateTowerResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DeactivateTower not implemented")
 }
+func (UnimplementedWatchtowerClientServer) TerminateSession(context.Context, *TerminateSessionRequest) (*TerminateSessionResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method TerminateSession not implemented")
+}
 func (UnimplementedWatchtowerClientServer) ListTowers(context.Context, *ListTowersRequest) (*ListTowersResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListTowers not implemented")
 }
@@ -248,6 +268,24 @@ func _WatchtowerClient_DeactivateTower_Handler(srv interface{}, ctx context.Cont
 	return interceptor(ctx, in, info, handler)
 }
 
+func _WatchtowerClient_TerminateSession_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(TerminateSessionRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(WatchtowerClientServer).TerminateSession(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/wtclientrpc.WatchtowerClient/TerminateSession",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(WatchtowerClientServer).TerminateSession(ctx, req.(*TerminateSessionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _WatchtowerClient_ListTowers_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ListTowersRequest)
 	if err := dec(in); err != nil {
@@ -339,6 +377,10 @@ var WatchtowerClient_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "DeactivateTower",
 			Handler:    _WatchtowerClient_DeactivateTower_Handler,
 		},
+		{
+			MethodName: "TerminateSession",
+			Handler:    _WatchtowerClient_TerminateSession_Handler,
+		},
 		{
 			MethodName: "ListTowers",
 			Handler:    _WatchtowerClient_ListTowers_Handler,

From a9648cbdd1e7ea749796e9caa413a67da5894c01 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 9 Feb 2024 12:48:11 +0200
Subject: [PATCH 13/18] wtclient: load all active towers into memory

Load an active tower into memory regardless of whether or not it has any
sessions.
---
 watchtower/wtclient/client.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/watchtower/wtclient/client.go b/watchtower/wtclient/client.go
index e8fec5d4a..167a98268 100644
--- a/watchtower/wtclient/client.go
+++ b/watchtower/wtclient/client.go
@@ -324,9 +324,9 @@ func getTowerAndSessionCandidates(db DB, keyRing ECDHKeyRing,
 
 			// Add the session to the set of candidate sessions.
 			candidateSessions[s.ID] = cs
-
-			perActiveTower(tower)
 		}
+
+		perActiveTower(tower)
 	}
 
 	return candidateSessions, nil

From 1c7a7543c7b2b07e6d9b739039e031d9789c420a Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 9 Feb 2024 15:10:32 +0200
Subject: [PATCH 14/18] lnrpc: add session ID to tower session info

This will be used in the itest added in an upcoming commit so that we can
test the TerminateSession command.
---
 lnrpc/wtclientrpc/wtclient.go           |  1 +
 lnrpc/wtclientrpc/wtclient.pb.go        | 12 +++++++++++-
 lnrpc/wtclientrpc/wtclient.proto        |  5 +++++
 lnrpc/wtclientrpc/wtclient.swagger.json |  5 +++++
 4 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/lnrpc/wtclientrpc/wtclient.go b/lnrpc/wtclientrpc/wtclient.go
index 8e9de23b7..459ce3240 100644
--- a/lnrpc/wtclientrpc/wtclient.go
+++ b/lnrpc/wtclientrpc/wtclient.go
@@ -550,6 +550,7 @@ func marshallTower(tower *wtclient.RegisteredTower, policyType PolicyType,
 		for _, session := range sessions {
 			satPerVByte := session.Policy.SweepFeeRate.FeePerVByte()
 			rpcSessions = append(rpcSessions, &TowerSession{
+				Id:                session.ID[:],
 				NumBackups:        uint32(ackCounts[session.ID]),
 				NumPendingBackups: uint32(pendingCounts[session.ID]),
 				MaxBackups:        uint32(session.Policy.MaxUpdates),
diff --git a/lnrpc/wtclientrpc/wtclient.pb.go b/lnrpc/wtclientrpc/wtclient.pb.go
index e9bd28610..828575366 100644
--- a/lnrpc/wtclientrpc/wtclient.pb.go
+++ b/lnrpc/wtclientrpc/wtclient.pb.go
@@ -545,6 +545,8 @@ type TowerSession struct {
 	// The fee rate, in satoshis per vbyte, that will be used by the watchtower for
 	// the justice transaction in the event of a channel breach.
 	SweepSatPerVbyte uint32 `protobuf:"varint,5,opt,name=sweep_sat_per_vbyte,json=sweepSatPerVbyte,proto3" json:"sweep_sat_per_vbyte,omitempty"`
+	// The ID of the session.
+	Id []byte `protobuf:"bytes,6,opt,name=id,proto3" json:"id,omitempty"`
 }
 
 func (x *TowerSession) Reset() {
@@ -615,6 +617,13 @@ func (x *TowerSession) GetSweepSatPerVbyte() uint32 {
 	return 0
 }
 
+func (x *TowerSession) GetId() []byte {
+	if x != nil {
+		return x.Id
+	}
+	return nil
+}
+
 type Tower struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1189,7 +1198,7 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
 	0x3c, 0x0a, 0x1a, 0x65, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x5f, 0x65, 0x78, 0x68, 0x61, 0x75,
 	0x73, 0x74, 0x65, 0x64, 0x5f, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x03, 0x20,
 	0x01, 0x28, 0x08, 0x52, 0x18, 0x65, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x45, 0x78, 0x68, 0x61,
-	0x75, 0x73, 0x74, 0x65, 0x64, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x73, 0x22, 0xe0, 0x01,
+	0x75, 0x73, 0x74, 0x65, 0x64, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x73, 0x22, 0xf0, 0x01,
 	0x0a, 0x0c, 0x54, 0x6f, 0x77, 0x65, 0x72, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x12, 0x1f,
 	0x0a, 0x0b, 0x6e, 0x75, 0x6d, 0x5f, 0x62, 0x61, 0x63, 0x6b, 0x75, 0x70, 0x73, 0x18, 0x01, 0x20,
 	0x01, 0x28, 0x0d, 0x52, 0x0a, 0x6e, 0x75, 0x6d, 0x42, 0x61, 0x63, 0x6b, 0x75, 0x70, 0x73, 0x12,
@@ -1204,6 +1213,7 @@ var file_wtclientrpc_wtclient_proto_rawDesc = []byte{
 	0x65, 0x12, 0x2d, 0x0a, 0x13, 0x73, 0x77, 0x65, 0x65, 0x70, 0x5f, 0x73, 0x61, 0x74, 0x5f, 0x70,
 	0x65, 0x72, 0x5f, 0x76, 0x62, 0x79, 0x74, 0x65, 0x18, 0x05, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x10,
 	0x73, 0x77, 0x65, 0x65, 0x70, 0x53, 0x61, 0x74, 0x50, 0x65, 0x72, 0x56, 0x62, 0x79, 0x74, 0x65,
+	0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x06, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x02, 0x69, 0x64,
 	0x22, 0x9f, 0x02, 0x0a, 0x05, 0x54, 0x6f, 0x77, 0x65, 0x72, 0x12, 0x16, 0x0a, 0x06, 0x70, 0x75,
 	0x62, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x06, 0x70, 0x75, 0x62, 0x6b,
 	0x65, 0x79, 0x12, 0x1c, 0x0a, 0x09, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x65, 0x73, 0x18,
diff --git a/lnrpc/wtclientrpc/wtclient.proto b/lnrpc/wtclientrpc/wtclient.proto
index 3272d0951..edc79b8d1 100644
--- a/lnrpc/wtclientrpc/wtclient.proto
+++ b/lnrpc/wtclientrpc/wtclient.proto
@@ -163,6 +163,11 @@ message TowerSession {
     the justice transaction in the event of a channel breach.
     */
     uint32 sweep_sat_per_vbyte = 5;
+
+    /*
+    The ID of the session.
+    */
+    bytes id = 6;
 }
 
 message Tower {
diff --git a/lnrpc/wtclientrpc/wtclient.swagger.json b/lnrpc/wtclientrpc/wtclient.swagger.json
index 676f183bc..22467258a 100644
--- a/lnrpc/wtclientrpc/wtclient.swagger.json
+++ b/lnrpc/wtclientrpc/wtclient.swagger.json
@@ -509,6 +509,11 @@
           "type": "integer",
           "format": "int64",
           "description": "The fee rate, in satoshis per vbyte, that will be used by the watchtower for\nthe justice transaction in the event of a channel breach."
+        },
+        "id": {
+          "type": "string",
+          "format": "byte",
+          "description": "The ID of the session."
         }
       }
     },

From d4424fbcfaf8107f35199fefd9879d44593824af Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 9 Feb 2024 12:45:36 +0200
Subject: [PATCH 15/18] itest: refactor watchtower related tests

---
 itest/list_on_test.go        |  12 +-
 itest/lnd_revocation_test.go | 303 -----------------------------
 itest/lnd_watchtower_test.go | 357 ++++++++++++++++++++++++++++++++---
 3 files changed, 335 insertions(+), 337 deletions(-)

diff --git a/itest/list_on_test.go b/itest/list_on_test.go
index e8cf80c5f..c7e76a52f 100644
--- a/itest/list_on_test.go
+++ b/itest/list_on_test.go
@@ -519,16 +519,8 @@ var allTestCases = []*lntest.TestCase{
 		TestFunc: testLookupHtlcResolution,
 	},
 	{
-		Name:     "watchtower session management",
-		TestFunc: testWatchtowerSessionManagement,
-	},
-	{
-		// NOTE: this test must be put in the same tranche as
-		// `testWatchtowerSessionManagement` to avoid parallel use of
-		// the default watchtower port.
-		Name: "revoked uncooperative close retribution altruist " +
-			"watchtower",
-		TestFunc: testRevokedCloseRetributionAltruistWatchtower,
+		Name:     "watchtower",
+		TestFunc: testWatchtower,
 	},
 	{
 		Name:     "channel fundmax",
diff --git a/itest/lnd_revocation_test.go b/itest/lnd_revocation_test.go
index d02e60d7e..d94fa7c43 100644
--- a/itest/lnd_revocation_test.go
+++ b/itest/lnd_revocation_test.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"testing"
-	"time"
 
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
@@ -12,7 +11,6 @@ import (
 	"github.com/go-errors/errors"
 	"github.com/lightningnetwork/lnd/funding"
 	"github.com/lightningnetwork/lnd/lnrpc"
-	"github.com/lightningnetwork/lnd/lnrpc/wtclientrpc"
 	"github.com/lightningnetwork/lnd/lntest"
 	"github.com/lightningnetwork/lnd/lntest/wait"
 	"github.com/stretchr/testify/require"
@@ -707,304 +705,3 @@ func testRevokedCloseRetributionRemoteHodl(ht *lntest.HarnessTest) {
 		})
 	}
 }
-
-// testRevokedCloseRetributionAltruistWatchtower establishes a channel between
-// Carol and Dave, where Carol is using a third node Willy as her watchtower.
-// After sending some payments, Dave reverts his state and force closes to
-// trigger a breach. Carol is kept offline throughout the process and the test
-// asserts that Willy responds by broadcasting the justice transaction on
-// Carol's behalf sweeping her funds without a reward.
-func testRevokedCloseRetributionAltruistWatchtower(ht *lntest.HarnessTest) {
-	for _, commitType := range []lnrpc.CommitmentType{
-		lnrpc.CommitmentType_LEGACY,
-		lnrpc.CommitmentType_ANCHORS,
-		lnrpc.CommitmentType_SIMPLE_TAPROOT,
-	} {
-		testName := fmt.Sprintf("%v", commitType.String())
-		ct := commitType
-		testFunc := func(ht *lntest.HarnessTest) {
-			testRevokedCloseRetributionAltruistWatchtowerCase(
-				ht, ct,
-			)
-		}
-
-		success := ht.Run(testName, func(tt *testing.T) {
-			st := ht.Subtest(tt)
-
-			st.RunTestCase(&lntest.TestCase{
-				Name:     testName,
-				TestFunc: testFunc,
-			})
-		})
-
-		if !success {
-			// Log failure time to help relate the lnd logs to the
-			// failure.
-			ht.Logf("Failure time: %v", time.Now().Format(
-				"2006-01-02 15:04:05.000",
-			))
-
-			break
-		}
-	}
-}
-
-func testRevokedCloseRetributionAltruistWatchtowerCase(ht *lntest.HarnessTest,
-	commitType lnrpc.CommitmentType) {
-
-	const (
-		chanAmt     = funding.MaxBtcFundingAmount
-		paymentAmt  = 10000
-		numInvoices = 6
-		externalIP  = "1.2.3.4"
-	)
-
-	// Since we'd like to test some multi-hop failure scenarios, we'll
-	// introduce another node into our test network: Carol.
-	carolArgs := lntest.NodeArgsForCommitType(commitType)
-	carolArgs = append(carolArgs, "--hodl.exit-settle")
-
-	carol := ht.NewNode("Carol", carolArgs)
-
-	// Willy the watchtower will protect Dave from Carol's breach. He will
-	// remain online in order to punish Carol on Dave's behalf, since the
-	// breach will happen while Dave is offline.
-	willy := ht.NewNode(
-		"Willy", []string{
-			"--watchtower.active",
-			"--watchtower.externalip=" + externalIP,
-		},
-	)
-
-	willyInfo := willy.RPC.GetInfoWatchtower()
-
-	// Assert that Willy has one listener and it is 0.0.0.0:9911 or
-	// [::]:9911. Since no listener is explicitly specified, one of these
-	// should be the default depending on whether the host supports IPv6 or
-	// not.
-	require.Len(ht, willyInfo.Listeners, 1, "Willy should have 1 listener")
-	listener := willyInfo.Listeners[0]
-	if listener != "0.0.0.0:9911" && listener != "[::]:9911" {
-		ht.Fatalf("expected listener on 0.0.0.0:9911 or [::]:9911, "+
-			"got %v", listener)
-	}
-
-	// Assert the Willy's URIs properly display the chosen external IP.
-	require.Len(ht, willyInfo.Uris, 1, "Willy should have 1 uri")
-	require.Contains(ht, willyInfo.Uris[0], externalIP)
-
-	// Dave will be the breached party. We set --nolisten to ensure Carol
-	// won't be able to connect to him and trigger the channel data
-	// protection logic automatically.
-	daveArgs := lntest.NodeArgsForCommitType(commitType)
-	daveArgs = append(daveArgs, "--nolisten", "--wtclient.active")
-	dave := ht.NewNode("Dave", daveArgs)
-
-	addTowerReq := &wtclientrpc.AddTowerRequest{
-		Pubkey:  willyInfo.Pubkey,
-		Address: listener,
-	}
-	dave.RPC.AddTower(addTowerReq)
-
-	// We must let Dave have an open channel before she can send a node
-	// announcement, so we open a channel with Carol,
-	ht.ConnectNodes(dave, carol)
-
-	// Before we make a channel, we'll load up Dave with some coins sent
-	// directly from the miner.
-	ht.FundCoins(btcutil.SatoshiPerBitcoin, dave)
-
-	// Send one more UTXOs if this is a neutrino backend.
-	if ht.IsNeutrinoBackend() {
-		ht.FundCoins(btcutil.SatoshiPerBitcoin, dave)
-	}
-
-	// In order to test Dave's response to an uncooperative channel
-	// closure by Carol, we'll first open up a channel between them with a
-	// 0.5 BTC value.
-	params := lntest.OpenChannelParams{
-		Amt:            3 * (chanAmt / 4),
-		PushAmt:        chanAmt / 4,
-		CommitmentType: commitType,
-		Private:        true,
-	}
-	chanPoint := ht.OpenChannel(dave, carol, params)
-
-	// With the channel open, we'll create a few invoices for Carol that
-	// Dave will pay to in order to advance the state of the channel.
-	carolPayReqs, _, _ := ht.CreatePayReqs(carol, paymentAmt, numInvoices)
-
-	// Next query for Carol's channel state, as we sent 0 payments, Carol
-	// should still see her balance as the push amount, which is 1/4 of the
-	// capacity.
-	carolChan := ht.AssertChannelLocalBalance(
-		carol, chanPoint, int64(chanAmt/4),
-	)
-
-	// Grab Carol's current commitment height (update number), we'll later
-	// revert her to this state after additional updates to force him to
-	// broadcast this soon to be revoked state.
-	carolStateNumPreCopy := int(carolChan.NumUpdates)
-
-	// With the temporary file created, copy Carol's current state into the
-	// temporary file we created above. Later after more updates, we'll
-	// restore this state.
-	ht.BackupDB(carol)
-
-	// Reconnect the peers after the restart that was needed for the db
-	// backup.
-	ht.EnsureConnected(dave, carol)
-
-	// Once connected, give Dave some time to enable the channel again.
-	ht.AssertTopologyChannelOpen(dave, chanPoint)
-
-	// Finally, send payments from Dave to Carol, consuming Carol's
-	// remaining payment hashes.
-	ht.CompletePaymentRequestsNoWait(dave, carolPayReqs, chanPoint)
-
-	daveBalResp := dave.RPC.WalletBalance()
-	davePreSweepBalance := daveBalResp.ConfirmedBalance
-
-	// Wait until the backup has been accepted by the watchtower before
-	// shutting down Dave.
-	err := wait.NoError(func() error {
-		bkpStats := dave.RPC.WatchtowerStats()
-		if bkpStats == nil {
-			return errors.New("no active backup sessions")
-		}
-		if bkpStats.NumBackups == 0 {
-			return errors.New("no backups accepted")
-		}
-
-		return nil
-	}, defaultTimeout)
-	require.NoError(ht, err, "unable to verify backup task completed")
-
-	// Shutdown Dave to simulate going offline for an extended period of
-	// time. Once he's not watching, Carol will try to breach the channel.
-	restart := ht.SuspendNode(dave)
-
-	// Now we shutdown Carol, copying over the his temporary database state
-	// which has the *prior* channel state over his current most up to date
-	// state. With this, we essentially force Carol to travel back in time
-	// within the channel's history.
-	ht.RestartNodeAndRestoreDB(carol)
-
-	// Now query for Carol's channel state, it should show that he's at a
-	// state number in the past, not the *latest* state.
-	ht.AssertChannelCommitHeight(carol, chanPoint, carolStateNumPreCopy)
-
-	// Now force Carol to execute a *force* channel closure by unilaterally
-	// broadcasting his current channel state. This is actually the
-	// commitment transaction of a prior *revoked* state, so he'll soon
-	// feel the wrath of Dave's retribution.
-	closeUpdates, closeTxID := ht.CloseChannelAssertPending(
-		carol, chanPoint, true,
-	)
-
-	// Finally, generate a single block, wait for the final close status
-	// update, then ensure that the closing transaction was included in the
-	// block.
-	block := ht.MineBlocksAndAssertNumTxes(1, 1)[0]
-
-	breachTXID := ht.WaitForChannelCloseEvent(closeUpdates)
-	ht.Miner.AssertTxInBlock(block, breachTXID)
-
-	// The breachTXID should match the above closeTxID.
-	require.EqualValues(ht, breachTXID, closeTxID)
-
-	// Query the mempool for Dave's justice transaction, this should be
-	// broadcast as Carol's contract breaching transaction gets confirmed
-	// above.
-	justiceTXID := ht.Miner.AssertNumTxsInMempool(1)[0]
-
-	// Query for the mempool transaction found above. Then assert that all
-	// the inputs of this transaction are spending outputs generated by
-	// Carol's breach transaction above.
-	justiceTx := ht.Miner.GetRawTransaction(justiceTXID)
-	for _, txIn := range justiceTx.MsgTx().TxIn {
-		require.Equal(ht, breachTXID[:], txIn.PreviousOutPoint.Hash[:],
-			"justice tx not spending commitment utxo")
-	}
-
-	willyBalResp := willy.RPC.WalletBalance()
-	require.Zero(ht, willyBalResp.ConfirmedBalance,
-		"willy should have 0 balance before mining justice transaction")
-
-	// Now mine a block, this transaction should include Dave's justice
-	// transaction which was just accepted into the mempool.
-	block = ht.MineBlocksAndAssertNumTxes(1, 1)[0]
-
-	// The block should have exactly *two* transactions, one of which is
-	// the justice transaction.
-	require.Len(ht, block.Transactions, 2, "transaction wasn't mined")
-	justiceSha := block.Transactions[1].TxHash()
-	require.Equal(ht, justiceTx.Hash()[:], justiceSha[:],
-		"justice tx wasn't mined")
-
-	// Ensure that Willy doesn't get any funds, as he is acting as an
-	// altruist watchtower.
-	err = wait.NoError(func() error {
-		willyBalResp := willy.RPC.WalletBalance()
-
-		if willyBalResp.ConfirmedBalance != 0 {
-			return fmt.Errorf("expected Willy to have no funds "+
-				"after justice transaction was mined, found %v",
-				willyBalResp)
-		}
-
-		return nil
-	}, time.Second*5)
-	require.NoError(ht, err, "timeout checking willy's balance")
-
-	// Before restarting Dave, shutdown Carol so Dave won't sync with her.
-	// Otherwise, during the restart, Dave will realize Carol is falling
-	// behind and return `ErrCommitSyncRemoteDataLoss`, thus force closing
-	// the channel. Although this force close tx will be later replaced by
-	// the breach tx, it will create two anchor sweeping txes for neutrino
-	// backend, causing the confirmed wallet balance to be zero later on
-	// because the utxos are used in sweeping.
-	ht.Shutdown(carol)
-
-	// Restart Dave, who will still think his channel with Carol is open.
-	// We should him to detect the breach, but realize that the funds have
-	// then been swept to his wallet by Willy.
-	require.NoError(ht, restart(), "unable to restart dave")
-
-	err = wait.NoError(func() error {
-		daveBalResp := dave.RPC.ChannelBalance()
-		if daveBalResp.LocalBalance.Sat != 0 {
-			return fmt.Errorf("Dave should end up with zero "+
-				"channel balance, instead has %d",
-				daveBalResp.LocalBalance.Sat)
-		}
-
-		return nil
-	}, defaultTimeout)
-	require.NoError(ht, err, "timeout checking dave's channel balance")
-
-	ht.AssertNumPendingForceClose(dave, 0)
-
-	// If this is an anchor channel, Dave would sweep the anchor.
-	if lntest.CommitTypeHasAnchors(commitType) {
-		ht.MineBlocksAndAssertNumTxes(1, 1)
-	}
-
-	// Check that Dave's wallet balance is increased.
-	err = wait.NoError(func() error {
-		daveBalResp := dave.RPC.WalletBalance()
-
-		if daveBalResp.ConfirmedBalance <= davePreSweepBalance {
-			return fmt.Errorf("Dave should have more than %d "+
-				"after sweep, instead has %d",
-				davePreSweepBalance,
-				daveBalResp.ConfirmedBalance)
-		}
-
-		return nil
-	}, defaultTimeout)
-	require.NoError(ht, err, "timeout checking dave's wallet balance")
-
-	// Dave should have no open channels.
-	ht.AssertNodeNumChannels(dave, 0)
-}
diff --git a/itest/lnd_watchtower_test.go b/itest/lnd_watchtower_test.go
index 3432848d8..efd14503b 100644
--- a/itest/lnd_watchtower_test.go
+++ b/itest/lnd_watchtower_test.go
@@ -2,21 +2,38 @@ package itest
 
 import (
 	"fmt"
+	"testing"
+	"time"
 
 	"github.com/btcsuite/btcd/btcutil"
+	"github.com/go-errors/errors"
 	"github.com/lightningnetwork/lnd/funding"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/wtclientrpc"
 	"github.com/lightningnetwork/lnd/lntest"
 	"github.com/lightningnetwork/lnd/lntest/node"
+	"github.com/lightningnetwork/lnd/lntest/rpc"
 	"github.com/lightningnetwork/lnd/lntest/wait"
 	"github.com/stretchr/testify/require"
 )
 
-// testWatchtowerSessionManagement tests that session deletion is done
-// correctly.
-func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
+// testWatchtower tests the behaviour of the watchtower client and server.
+func testWatchtower(ht *lntest.HarnessTest) {
+	ht.Run("revocation", func(t *testing.T) {
+		tt := ht.Subtest(t)
+		testRevokedCloseRetributionAltruistWatchtower(tt)
+	})
+
+	ht.Run("session deletion", func(t *testing.T) {
+		tt := ht.Subtest(t)
+		testTowerClientSessionDeletion(tt)
+	})
+}
+
+// testTowerClientSessionDeletion tests that sessions are correctly deleted
+// when they are deemed closable.
+func testTowerClientSessionDeletion(ht *lntest.HarnessTest) {
 	const (
 		chanAmt           = funding.MaxBtcFundingAmount
 		paymentAmt        = 10_000
@@ -28,24 +45,7 @@ func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
 
 	// Set up Wallis the watchtower who will be used by Dave to watch over
 	// his channel commitment transactions.
-	wallis := ht.NewNode("Wallis", []string{
-		"--watchtower.active",
-		"--watchtower.externalip=" + externalIP,
-	})
-
-	wallisInfo := wallis.RPC.GetInfoWatchtower()
-
-	// Assert that Wallis has one listener and it is 0.0.0.0:9911 or
-	// [::]:9911. Since no listener is explicitly specified, one of these
-	// should be the default depending on whether the host supports IPv6 or
-	// not.
-	require.Len(ht, wallisInfo.Listeners, 1)
-	listener := wallisInfo.Listeners[0]
-	require.True(ht, listener == "0.0.0.0:9911" || listener == "[::]:9911")
-
-	// Assert the Wallis's URIs properly display the chosen external IP.
-	require.Len(ht, wallisInfo.Uris, 1)
-	require.Contains(ht, wallisInfo.Uris[0], externalIP)
+	wallisPk, listener, _ := setUpNewTower(ht, "Wallis", externalIP)
 
 	// Dave will be the tower client.
 	daveArgs := []string{
@@ -58,7 +58,7 @@ func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
 	dave := ht.NewNode("Dave", daveArgs)
 
 	addTowerReq := &wtclientrpc.AddTowerRequest{
-		Pubkey:  wallisInfo.Pubkey,
+		Pubkey:  wallisPk,
 		Address: listener,
 	}
 	dave.RPC.AddTower(addTowerReq)
@@ -66,7 +66,7 @@ func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
 	// Assert that there exists a session between Dave and Wallis.
 	err := wait.NoError(func() error {
 		info := dave.RPC.GetTowerInfo(&wtclientrpc.GetTowerInfoRequest{
-			Pubkey:          wallisInfo.Pubkey,
+			Pubkey:          wallisPk,
 			IncludeSessions: true,
 		})
 
@@ -125,7 +125,7 @@ func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
 		err = wait.NoError(func() error {
 			info := dave.RPC.GetTowerInfo(
 				&wtclientrpc.GetTowerInfoRequest{
-					Pubkey:          wallisInfo.Pubkey,
+					Pubkey:          wallisPk,
 					IncludeSessions: true,
 				},
 			)
@@ -170,3 +170,312 @@ func testWatchtowerSessionManagement(ht *lntest.HarnessTest) {
 	// ensure that the session deleting logic is run.
 	assertNumBackups(0, true)
 }
+
+// testRevokedCloseRetributionAltruistWatchtower establishes a channel between
+// Carol and Dave, where Carol is using a third node Willy as her watchtower.
+// After sending some payments, Dave reverts his state and force closes to
+// trigger a breach. Carol is kept offline throughout the process and the test
+// asserts that Willy responds by broadcasting the justice transaction on
+// Carol's behalf sweeping her funds without a reward.
+func testRevokedCloseRetributionAltruistWatchtower(ht *lntest.HarnessTest) {
+	for _, commitType := range []lnrpc.CommitmentType{
+		lnrpc.CommitmentType_LEGACY,
+		lnrpc.CommitmentType_ANCHORS,
+		lnrpc.CommitmentType_SIMPLE_TAPROOT,
+	} {
+		testName := fmt.Sprintf("%v", commitType.String())
+		ct := commitType
+		testFunc := func(ht *lntest.HarnessTest) {
+			testRevokedCloseRetributionAltruistWatchtowerCase(
+				ht, ct,
+			)
+		}
+
+		success := ht.Run(testName, func(tt *testing.T) {
+			st := ht.Subtest(tt)
+
+			st.RunTestCase(&lntest.TestCase{
+				Name:     testName,
+				TestFunc: testFunc,
+			})
+		})
+
+		if !success {
+			// Log failure time to help relate the lnd logs to the
+			// failure.
+			ht.Logf("Failure time: %v", time.Now().Format(
+				"2006-01-02 15:04:05.000",
+			))
+
+			break
+		}
+	}
+}
+
+func testRevokedCloseRetributionAltruistWatchtowerCase(ht *lntest.HarnessTest,
+	commitType lnrpc.CommitmentType) {
+
+	const (
+		chanAmt     = funding.MaxBtcFundingAmount
+		paymentAmt  = 10000
+		numInvoices = 6
+		externalIP  = "1.2.3.4"
+	)
+
+	// Since we'd like to test some multi-hop failure scenarios, we'll
+	// introduce another node into our test network: Carol.
+	carolArgs := lntest.NodeArgsForCommitType(commitType)
+	carolArgs = append(carolArgs, "--hodl.exit-settle")
+
+	carol := ht.NewNode("Carol", carolArgs)
+
+	// Set up Willy the watchtower who will protect Dave from Carol's
+	// breach. He will remain online in order to punish Carol on Dave's
+	// behalf, since the breach will happen while Dave is offline.
+	willyInfoPk, listener, willy := setUpNewTower(ht, "Willy", externalIP)
+
+	// Dave will be the breached party. We set --nolisten to ensure Carol
+	// won't be able to connect to him and trigger the channel data
+	// protection logic automatically.
+	daveArgs := lntest.NodeArgsForCommitType(commitType)
+	daveArgs = append(daveArgs, "--nolisten", "--wtclient.active")
+	dave := ht.NewNode("Dave", daveArgs)
+
+	addTowerReq := &wtclientrpc.AddTowerRequest{
+		Pubkey:  willyInfoPk,
+		Address: listener,
+	}
+	dave.RPC.AddTower(addTowerReq)
+
+	// We must let Dave have an open channel before she can send a node
+	// announcement, so we open a channel with Carol,
+	ht.ConnectNodes(dave, carol)
+
+	// Before we make a channel, we'll load up Dave with some coins sent
+	// directly from the miner.
+	ht.FundCoins(btcutil.SatoshiPerBitcoin, dave)
+
+	// Send one more UTXOs if this is a neutrino backend.
+	if ht.IsNeutrinoBackend() {
+		ht.FundCoins(btcutil.SatoshiPerBitcoin, dave)
+	}
+
+	// In order to test Dave's response to an uncooperative channel
+	// closure by Carol, we'll first open up a channel between them with a
+	// 0.5 BTC value.
+	params := lntest.OpenChannelParams{
+		Amt:            3 * (chanAmt / 4),
+		PushAmt:        chanAmt / 4,
+		CommitmentType: commitType,
+		Private:        true,
+	}
+	chanPoint := ht.OpenChannel(dave, carol, params)
+
+	// With the channel open, we'll create a few invoices for Carol that
+	// Dave will pay to in order to advance the state of the channel.
+	carolPayReqs, _, _ := ht.CreatePayReqs(carol, paymentAmt, numInvoices)
+
+	// Next query for Carol's channel state, as we sent 0 payments, Carol
+	// should still see her balance as the push amount, which is 1/4 of the
+	// capacity.
+	carolChan := ht.AssertChannelLocalBalance(
+		carol, chanPoint, int64(chanAmt/4),
+	)
+
+	// Grab Carol's current commitment height (update number), we'll later
+	// revert her to this state after additional updates to force him to
+	// broadcast this soon to be revoked state.
+	carolStateNumPreCopy := int(carolChan.NumUpdates)
+
+	// With the temporary file created, copy Carol's current state into the
+	// temporary file we created above. Later after more updates, we'll
+	// restore this state.
+	ht.BackupDB(carol)
+
+	// Reconnect the peers after the restart that was needed for the db
+	// backup.
+	ht.EnsureConnected(dave, carol)
+
+	// Once connected, give Dave some time to enable the channel again.
+	ht.AssertTopologyChannelOpen(dave, chanPoint)
+
+	// Finally, send payments from Dave to Carol, consuming Carol's
+	// remaining payment hashes.
+	ht.CompletePaymentRequestsNoWait(dave, carolPayReqs, chanPoint)
+
+	daveBalResp := dave.RPC.WalletBalance()
+	davePreSweepBalance := daveBalResp.ConfirmedBalance
+
+	// Wait until the backup has been accepted by the watchtower before
+	// shutting down Dave.
+	err := wait.NoError(func() error {
+		bkpStats := dave.RPC.WatchtowerStats()
+		if bkpStats == nil {
+			return errors.New("no active backup sessions")
+		}
+		if bkpStats.NumBackups == 0 {
+			return errors.New("no backups accepted")
+		}
+
+		return nil
+	}, defaultTimeout)
+	require.NoError(ht, err, "unable to verify backup task completed")
+
+	// Shutdown Dave to simulate going offline for an extended period of
+	// time. Once he's not watching, Carol will try to breach the channel.
+	restart := ht.SuspendNode(dave)
+
+	// Now we shutdown Carol, copying over the his temporary database state
+	// which has the *prior* channel state over his current most up to date
+	// state. With this, we essentially force Carol to travel back in time
+	// within the channel's history.
+	ht.RestartNodeAndRestoreDB(carol)
+
+	// Now query for Carol's channel state, it should show that he's at a
+	// state number in the past, not the *latest* state.
+	ht.AssertChannelCommitHeight(carol, chanPoint, carolStateNumPreCopy)
+
+	// Now force Carol to execute a *force* channel closure by unilaterally
+	// broadcasting his current channel state. This is actually the
+	// commitment transaction of a prior *revoked* state, so he'll soon
+	// feel the wrath of Dave's retribution.
+	closeUpdates, closeTxID := ht.CloseChannelAssertPending(
+		carol, chanPoint, true,
+	)
+
+	// Finally, generate a single block, wait for the final close status
+	// update, then ensure that the closing transaction was included in the
+	// block.
+	block := ht.MineBlocksAndAssertNumTxes(1, 1)[0]
+
+	breachTXID := ht.WaitForChannelCloseEvent(closeUpdates)
+	ht.Miner.AssertTxInBlock(block, breachTXID)
+
+	// The breachTXID should match the above closeTxID.
+	require.EqualValues(ht, breachTXID, closeTxID)
+
+	// Query the mempool for Dave's justice transaction, this should be
+	// broadcast as Carol's contract breaching transaction gets confirmed
+	// above.
+	justiceTXID := ht.Miner.AssertNumTxsInMempool(1)[0]
+
+	// Query for the mempool transaction found above. Then assert that all
+	// the inputs of this transaction are spending outputs generated by
+	// Carol's breach transaction above.
+	justiceTx := ht.Miner.GetRawTransaction(justiceTXID)
+	for _, txIn := range justiceTx.MsgTx().TxIn {
+		require.Equal(ht, breachTXID[:], txIn.PreviousOutPoint.Hash[:],
+			"justice tx not spending commitment utxo")
+	}
+
+	willyBalResp := willy.WalletBalance()
+	require.Zero(ht, willyBalResp.ConfirmedBalance,
+		"willy should have 0 balance before mining justice transaction")
+
+	// Now mine a block, this transaction should include Dave's justice
+	// transaction which was just accepted into the mempool.
+	block = ht.MineBlocksAndAssertNumTxes(1, 1)[0]
+
+	// The block should have exactly *two* transactions, one of which is
+	// the justice transaction.
+	require.Len(ht, block.Transactions, 2, "transaction wasn't mined")
+	justiceSha := block.Transactions[1].TxHash()
+	require.Equal(ht, justiceTx.Hash()[:], justiceSha[:],
+		"justice tx wasn't mined")
+
+	// Ensure that Willy doesn't get any funds, as he is acting as an
+	// altruist watchtower.
+	err = wait.NoError(func() error {
+		willyBalResp := willy.WalletBalance()
+
+		if willyBalResp.ConfirmedBalance != 0 {
+			return fmt.Errorf("expected Willy to have no funds "+
+				"after justice transaction was mined, found %v",
+				willyBalResp)
+		}
+
+		return nil
+	}, time.Second*5)
+	require.NoError(ht, err, "timeout checking willy's balance")
+
+	// Before restarting Dave, shutdown Carol so Dave won't sync with her.
+	// Otherwise, during the restart, Dave will realize Carol is falling
+	// behind and return `ErrCommitSyncRemoteDataLoss`, thus force closing
+	// the channel. Although this force close tx will be later replaced by
+	// the breach tx, it will create two anchor sweeping txes for neutrino
+	// backend, causing the confirmed wallet balance to be zero later on
+	// because the utxos are used in sweeping.
+	ht.Shutdown(carol)
+
+	// Restart Dave, who will still think his channel with Carol is open.
+	// We should him to detect the breach, but realize that the funds have
+	// then been swept to his wallet by Willy.
+	require.NoError(ht, restart(), "unable to restart dave")
+
+	err = wait.NoError(func() error {
+		daveBalResp := dave.RPC.ChannelBalance()
+		if daveBalResp.LocalBalance.Sat != 0 {
+			return fmt.Errorf("Dave should end up with zero "+
+				"channel balance, instead has %d",
+				daveBalResp.LocalBalance.Sat)
+		}
+
+		return nil
+	}, defaultTimeout)
+	require.NoError(ht, err, "timeout checking dave's channel balance")
+
+	ht.AssertNumPendingForceClose(dave, 0)
+
+	// If this is an anchor channel, Dave would sweep the anchor.
+	if lntest.CommitTypeHasAnchors(commitType) {
+		ht.MineBlocksAndAssertNumTxes(1, 1)
+	}
+
+	// Check that Dave's wallet balance is increased.
+	err = wait.NoError(func() error {
+		daveBalResp := dave.RPC.WalletBalance()
+
+		if daveBalResp.ConfirmedBalance <= davePreSweepBalance {
+			return fmt.Errorf("Dave should have more than %d "+
+				"after sweep, instead has %d",
+				davePreSweepBalance,
+				daveBalResp.ConfirmedBalance)
+		}
+
+		return nil
+	}, defaultTimeout)
+	require.NoError(ht, err, "timeout checking dave's wallet balance")
+
+	// Dave should have no open channels.
+	ht.AssertNodeNumChannels(dave, 0)
+}
+
+func setUpNewTower(ht *lntest.HarnessTest, name, externalIP string) ([]byte,
+	string, *rpc.HarnessRPC) {
+
+	port := node.NextAvailablePort()
+
+	listenAddr := fmt.Sprintf("0.0.0.0:%d", port)
+
+	// Set up the new watchtower.
+	tower := ht.NewNode(name, []string{
+		"--watchtower.active",
+		"--watchtower.externalip=" + externalIP,
+		"--watchtower.listen=" + listenAddr,
+	})
+
+	towerInfo := tower.RPC.GetInfoWatchtower()
+
+	require.Len(ht, towerInfo.Listeners, 1)
+	listener := towerInfo.Listeners[0]
+	require.True(
+		ht, listener == listenAddr ||
+			listener == fmt.Sprintf("[::]:%d", port),
+	)
+
+	// Assert the Tower's URIs properly display the chosen external IP.
+	require.Len(ht, towerInfo.Uris, 1)
+	require.Contains(ht, towerInfo.Uris[0], externalIP)
+
+	return towerInfo.Pubkey, towerInfo.Listeners[0], tower.RPC
+}

From 59a4bfbc59a235e367b3106879806a6dcae68f11 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 9 Feb 2024 13:24:19 +0200
Subject: [PATCH 16/18] itest+refactor: extract various tower test helpers

---
 itest/lnd_watchtower_test.go | 131 ++++++++++++++++++++---------------
 1 file changed, 76 insertions(+), 55 deletions(-)

diff --git a/itest/lnd_watchtower_test.go b/itest/lnd_watchtower_test.go
index efd14503b..92336c863 100644
--- a/itest/lnd_watchtower_test.go
+++ b/itest/lnd_watchtower_test.go
@@ -36,7 +36,6 @@ func testWatchtower(ht *lntest.HarnessTest) {
 func testTowerClientSessionDeletion(ht *lntest.HarnessTest) {
 	const (
 		chanAmt           = funding.MaxBtcFundingAmount
-		paymentAmt        = 10_000
 		numInvoices       = 5
 		maxUpdates        = numInvoices * 2
 		externalIP        = "1.2.3.4"
@@ -98,61 +97,10 @@ func testTowerClientSessionDeletion(ht *lntest.HarnessTest) {
 	// Since there are 2 updates made for every payment and the maximum
 	// number of updates per session has been set to 10, make 5 payments
 	// between the pair so that the session is exhausted.
-	alicePayReqs, _, _ := ht.CreatePayReqs(
-		ht.Alice, paymentAmt, numInvoices,
-	)
-
-	send := func(node *node.HarnessNode, payReq string) {
-		stream := node.RPC.SendPayment(&routerrpc.SendPaymentRequest{
-			PaymentRequest: payReq,
-			TimeoutSeconds: 60,
-			FeeLimitMsat:   noFeeLimitMsat,
-		})
-
-		ht.AssertPaymentStatusFromStream(
-			stream, lnrpc.Payment_SUCCEEDED,
-		)
-	}
-
-	for i := 0; i < numInvoices; i++ {
-		send(dave, alicePayReqs[i])
-	}
-
-	// assertNumBackups is a closure that asserts that Dave has a certain
-	// number of backups backed up to the tower. If mineOnFail is true,
-	// then a block will be mined each time the assertion fails.
-	assertNumBackups := func(expected int, mineOnFail bool) {
-		err = wait.NoError(func() error {
-			info := dave.RPC.GetTowerInfo(
-				&wtclientrpc.GetTowerInfoRequest{
-					Pubkey:          wallisPk,
-					IncludeSessions: true,
-				},
-			)
-
-			var numBackups uint32
-			for _, sessionType := range info.SessionInfo {
-				for _, session := range sessionType.Sessions {
-					numBackups += session.NumBackups
-				}
-			}
-
-			if numBackups == uint32(expected) {
-				return nil
-			}
-
-			if mineOnFail {
-				ht.Miner.MineBlocksSlow(1)
-			}
-
-			return fmt.Errorf("expected %d backups, got %d",
-				expected, numBackups)
-		}, defaultTimeout)
-		require.NoError(ht, err)
-	}
+	generateBackups(ht, dave, ht.Alice, maxUpdates)
 
 	// Assert that one of the sessions now has 10 backups.
-	assertNumBackups(10, false)
+	assertNumBackups(ht, dave.RPC, wallisPk, 10, false)
 
 	// Now close the channel and wait for the close transaction to appear
 	// in the mempool so that it is included in a block when we mine.
@@ -168,7 +116,7 @@ func testTowerClientSessionDeletion(ht *lntest.HarnessTest) {
 	// would immediately negotiate another session after deleting the
 	// exhausted one. This time we set the "mineOnFail" parameter to true to
 	// ensure that the session deleting logic is run.
-	assertNumBackups(0, true)
+	assertNumBackups(ht, dave.RPC, wallisPk, 0, true)
 }
 
 // testRevokedCloseRetributionAltruistWatchtower establishes a channel between
@@ -479,3 +427,76 @@ func setUpNewTower(ht *lntest.HarnessTest, name, externalIP string) ([]byte,
 
 	return towerInfo.Pubkey, towerInfo.Listeners[0], tower.RPC
 }
+
+// generateBackups is a helper function that can be used to create a number of
+// watchtower back-ups.
+func generateBackups(ht *lntest.HarnessTest, srcNode,
+	dstNode *node.HarnessNode, numBackups int64) {
+
+	const paymentAmt = 10_000
+
+	require.EqualValuesf(ht, numBackups%2, 0, "the number of desired "+
+		"back-ups must be even")
+
+	// Two updates are made for every payment.
+	numPayments := int(numBackups / 2)
+
+	// Create the required number of invoices.
+	alicePayReqs, _, _ := ht.CreatePayReqs(
+		dstNode, paymentAmt, numPayments,
+	)
+
+	send := func(node *node.HarnessNode, payReq string) {
+		stream := node.RPC.SendPayment(
+			&routerrpc.SendPaymentRequest{
+				PaymentRequest: payReq,
+				TimeoutSeconds: 60,
+				FeeLimitMsat:   noFeeLimitMsat,
+			},
+		)
+
+		ht.AssertPaymentStatusFromStream(
+			stream, lnrpc.Payment_SUCCEEDED,
+		)
+	}
+
+	// Pay each invoice.
+	for i := 0; i < numPayments; i++ {
+		send(srcNode, alicePayReqs[i])
+	}
+}
+
+// assertNumBackups is a helper that asserts that the given node has a certain
+// number of backups backed up to the tower. If mineOnFail is true, then a block
+// will be mined each time the assertion fails.
+func assertNumBackups(ht *lntest.HarnessTest, node *rpc.HarnessRPC,
+	towerPk []byte, expectedNumBackups int, mineOnFail bool) {
+
+	err := wait.NoError(func() error {
+		info := node.GetTowerInfo(
+			&wtclientrpc.GetTowerInfoRequest{
+				Pubkey:          towerPk,
+				IncludeSessions: true,
+			},
+		)
+
+		var numBackups uint32
+		for _, sessionType := range info.SessionInfo {
+			for _, session := range sessionType.Sessions {
+				numBackups += session.NumBackups
+			}
+		}
+
+		if numBackups == uint32(expectedNumBackups) {
+			return nil
+		}
+
+		if mineOnFail {
+			ht.Miner.MineBlocksSlow(1)
+		}
+
+		return fmt.Errorf("expected %d backups, got %d",
+			expectedNumBackups, numBackups)
+	}, defaultTimeout)
+	require.NoError(ht, err)
+}

From 4ab17525ce47ba8ec4f3758790afced22a072ae8 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Fri, 9 Feb 2024 12:47:35 +0200
Subject: [PATCH 17/18] itest+lntest: add wtclient session & tower management
 test

---
 itest/lnd_watchtower_test.go | 194 +++++++++++++++++++++++++++++++++++
 lntest/rpc/watchtower.go     |  32 ++++++
 2 files changed, 226 insertions(+)

diff --git a/itest/lnd_watchtower_test.go b/itest/lnd_watchtower_test.go
index 92336c863..bfd1425a5 100644
--- a/itest/lnd_watchtower_test.go
+++ b/itest/lnd_watchtower_test.go
@@ -29,6 +29,200 @@ func testWatchtower(ht *lntest.HarnessTest) {
 		tt := ht.Subtest(t)
 		testTowerClientSessionDeletion(tt)
 	})
+
+	ht.Run("tower and session activation", func(t *testing.T) {
+		tt := ht.Subtest(t)
+		testTowerClientTowerAndSessionManagement(tt)
+	})
+}
+
+// testTowerClientTowerAndSessionManagement tests the various control commands
+// that a user has over the client's set of active towers and sessions.
+func testTowerClientTowerAndSessionManagement(ht *lntest.HarnessTest) {
+	const (
+		chanAmt           = funding.MaxBtcFundingAmount
+		externalIP        = "1.2.3.4"
+		externalIP2       = "1.2.3.5"
+		sessionCloseRange = 1
+	)
+
+	// Set up Wallis the watchtower who will be used by Dave to watch over
+	// his channel commitment transactions.
+	wallisPk, wallisListener, _ := setUpNewTower(ht, "Wallis", externalIP)
+
+	// Dave will be the tower client.
+	daveArgs := []string{
+		"--wtclient.active",
+		fmt.Sprintf(
+			"--wtclient.session-close-range=%d", sessionCloseRange,
+		),
+	}
+	dave := ht.NewNode("Dave", daveArgs)
+
+	addWallisReq := &wtclientrpc.AddTowerRequest{
+		Pubkey:  wallisPk,
+		Address: wallisListener,
+	}
+	dave.RPC.AddTower(addWallisReq)
+
+	assertNumSessions := func(towerPk []byte, expectedNum int) {
+		err := wait.NoError(func() error {
+			info := dave.RPC.GetTowerInfo(
+				&wtclientrpc.GetTowerInfoRequest{
+					Pubkey:          towerPk,
+					IncludeSessions: true,
+				},
+			)
+
+			var numSessions uint32
+			for _, sessionType := range info.SessionInfo {
+				numSessions += sessionType.NumSessions
+			}
+			if numSessions == uint32(expectedNum) {
+				return nil
+			}
+
+			return fmt.Errorf("expected %d sessions, got %d",
+				expectedNum, numSessions)
+		}, defaultTimeout)
+		require.NoError(ht, err)
+	}
+
+	// Assert that there are a few sessions between Dave and Wallis. There
+	// should be one per client. There are currently 3 types of clients, so
+	// we expect 3 sessions.
+	assertNumSessions(wallisPk, 3)
+
+	// Before we make a channel, we'll load up Dave with some coins sent
+	// directly from the miner.
+	ht.FundCoins(btcutil.SatoshiPerBitcoin, dave)
+
+	// Connect Dave and Alice.
+	ht.ConnectNodes(dave, ht.Alice)
+
+	// Open a channel between Dave and Alice.
+	params := lntest.OpenChannelParams{
+		Amt: chanAmt,
+	}
+	chanPoint := ht.OpenChannel(dave, ht.Alice, params)
+
+	// Show that the Wallis tower is currently seen as an active session
+	// candidate.
+	info := dave.RPC.GetTowerInfo(&wtclientrpc.GetTowerInfoRequest{
+		Pubkey: wallisPk,
+	})
+	require.GreaterOrEqual(ht, len(info.SessionInfo), 1)
+	require.True(ht, info.SessionInfo[0].ActiveSessionCandidate)
+
+	// Make some back-ups and assert that they are added to a session with
+	// the tower.
+	generateBackups(ht, dave, ht.Alice, 4)
+
+	// Assert that one of the sessions now has 4 backups.
+	assertNumBackups(ht, dave.RPC, wallisPk, 4, false)
+
+	// Now, deactivate the tower and show that it is no longer considered
+	// an active session candidate.
+	dave.RPC.DeactivateTower(&wtclientrpc.DeactivateTowerRequest{
+		Pubkey: wallisPk,
+	})
+	info = dave.RPC.GetTowerInfo(&wtclientrpc.GetTowerInfoRequest{
+		Pubkey: wallisPk,
+	})
+	require.GreaterOrEqual(ht, len(info.SessionInfo), 1)
+	require.False(ht, info.SessionInfo[0].ActiveSessionCandidate)
+
+	// Back up a few more states.
+	generateBackups(ht, dave, ht.Alice, 4)
+
+	// These should _not_ be on the tower. Therefore, the number of
+	// back-ups on the tower should be the same as before.
+	assertNumBackups(ht, dave.RPC, wallisPk, 4, false)
+
+	// Add new tower and connect Dave to it.
+	wilmaPk, wilmaListener, _ := setUpNewTower(ht, "Wilma", externalIP2)
+	dave.RPC.AddTower(&wtclientrpc.AddTowerRequest{
+		Pubkey:  wilmaPk,
+		Address: wilmaListener,
+	})
+	assertNumSessions(wilmaPk, 3)
+
+	// The updates from before should now appear on the new watchtower.
+	assertNumBackups(ht, dave.RPC, wilmaPk, 4, false)
+
+	// Reactivate the Wallis tower and then deactivate the Wilma one.
+	dave.RPC.AddTower(addWallisReq)
+	dave.RPC.DeactivateTower(&wtclientrpc.DeactivateTowerRequest{
+		Pubkey: wilmaPk,
+	})
+
+	// Generate some more back-ups.
+	generateBackups(ht, dave, ht.Alice, 4)
+
+	// Assert that they get added to the first tower (Wallis) and that the
+	// number of sessions with Wallis has not changed - in other words, the
+	// previously used session was re-used.
+	assertNumBackups(ht, dave.RPC, wallisPk, 8, false)
+	assertNumSessions(wallisPk, 3)
+
+	findSession := func(towerPk []byte, numBackups uint32) []byte {
+		info := dave.RPC.GetTowerInfo(&wtclientrpc.GetTowerInfoRequest{
+			Pubkey:          towerPk,
+			IncludeSessions: true,
+		})
+
+		for _, sessionType := range info.SessionInfo {
+			for _, session := range sessionType.Sessions {
+				if session.NumBackups == numBackups {
+					return session.Id
+				}
+			}
+		}
+		ht.Fatalf("session with %d backups not found", numBackups)
+
+		return nil
+	}
+
+	// Now we will test the termination of a session.
+	// First, we need to figure out the ID of the session that has been used
+	// for back-ups.
+	sessionID := findSession(wallisPk, 8)
+
+	// Now, terminate the session.
+	dave.RPC.TerminateSession(&wtclientrpc.TerminateSessionRequest{
+		SessionId: sessionID,
+	})
+
+	// This should force the client to negotiate a new session. The old
+	// session still remains in our session list since the channel for which
+	// it has updates for is still open.
+	assertNumSessions(wallisPk, 4)
+
+	// Any new back-ups should now be backed up on a different session.
+	generateBackups(ht, dave, ht.Alice, 2)
+	assertNumBackups(ht, dave.RPC, wallisPk, 10, false)
+	findSession(wallisPk, 2)
+
+	// Close the channel.
+	ht.CloseChannelAssertPending(dave, chanPoint, false)
+
+	// Mine enough blocks to surpass the session close range buffer.
+	ht.MineBlocksAndAssertNumTxes(sessionCloseRange+6, 1)
+
+	// The session that was previously terminated now gets deleted since
+	// the channel for which it has updates has now been closed. All the
+	// remaining sessions are not yet closable since they are not yet
+	// exhausted and are all still active.
+	assertNumSessions(wallisPk, 3)
+
+	// For the sake of completion, we call RemoveTower here for both towers
+	// to show that this should never error.
+	dave.RPC.RemoveTower(&wtclientrpc.RemoveTowerRequest{
+		Pubkey: wallisPk,
+	})
+	dave.RPC.RemoveTower(&wtclientrpc.RemoveTowerRequest{
+		Pubkey: wilmaPk,
+	})
 }
 
 // testTowerClientSessionDeletion tests that sessions are correctly deleted
diff --git a/lntest/rpc/watchtower.go b/lntest/rpc/watchtower.go
index d5512e7a4..13913114c 100644
--- a/lntest/rpc/watchtower.go
+++ b/lntest/rpc/watchtower.go
@@ -52,6 +52,38 @@ func (h *HarnessRPC) AddTower(
 	return resp
 }
 
+// DeactivateTower makes an RPC call to the WatchtowerClient of the given node
+// and asserts.
+func (h *HarnessRPC) DeactivateTower(req *wtclientrpc.DeactivateTowerRequest) {
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	_, err := h.WatchtowerClient.DeactivateTower(ctxt, req)
+	h.NoError(err, "DeactivateTower")
+}
+
+// TerminateSession makes an RPC call to the WatchtowerClient of the given node
+// and asserts.
+func (h *HarnessRPC) TerminateSession(
+	req *wtclientrpc.TerminateSessionRequest) {
+
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	_, err := h.WatchtowerClient.TerminateSession(ctxt, req)
+	h.NoError(err, "TerminateSession")
+}
+
+// RemoveTower makes an RPC call to the WatchtowerClient of the given node
+// and asserts.
+func (h *HarnessRPC) RemoveTower(req *wtclientrpc.RemoveTowerRequest) {
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	_, err := h.WatchtowerClient.RemoveTower(ctxt, req)
+	h.NoError(err, "RemoveTower")
+}
+
 // WatchtowerStats makes a RPC call to the WatchtowerClient of the given node
 // and asserts.
 func (h *HarnessRPC) WatchtowerStats() *wtclientrpc.StatsResponse {

From a3ccae9a55709cfd1ae337fba7387d57ea8b1620 Mon Sep 17 00:00:00 2001
From: Elle Mouton <elle.mouton@gmail.com>
Date: Thu, 30 Nov 2023 12:17:08 +0200
Subject: [PATCH 18/18] docs: update release notes

---
 docs/release-notes/release-notes-0.18.0.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/release-notes/release-notes-0.18.0.md b/docs/release-notes/release-notes-0.18.0.md
index 1323c1f0e..5ccc18f3d 100644
--- a/docs/release-notes/release-notes-0.18.0.md
+++ b/docs/release-notes/release-notes-0.18.0.md
@@ -155,6 +155,13 @@
   about the txid and don't want the calling code to block while the channel
   drains the active HTLCs.
 
+* [New watchtower client DeactivateTower and 
+  TerminateSession](https://github.com/lightningnetwork/lnd/pull/8239) commands 
+  have been added. The DeactivateTower command can be used to mark a tower as 
+  inactive so that its sessions are not loaded on startup and so that the tower 
+  is not considered for session negotiation. TerminateSession can be used to 
+  mark a specific session as terminal so that that specific is never used again.
+
 ## lncli Additions
 
 * Deprecate `bumpclosefee` for `bumpforceclosefee` to accommodate for the fact