wtclient+lnrpc: move Stats to Manager

Move the `Stats` method from the `Client` to the `Manager` interface.

lnrpc/wtclientrpc/wtclient.go

@@ -420,19 +420,7 @@ func (c *WatchtowerClient) Stats(_ context.Context,
 		return nil, err
 	}
 
-	clientStats := []wtclient.ClientStats{
-		c.cfg.Client.Stats(),
-		c.cfg.AnchorClient.Stats(),
-	}
-
-	var stats wtclient.ClientStats
-	for _, stat := range clientStats {
-		stats.NumTasksAccepted += stat.NumTasksAccepted
-		stats.NumTasksIneligible += stat.NumTasksIneligible
-		stats.NumTasksPending += stat.NumTasksPending
-		stats.NumSessionsAcquired += stat.NumSessionsAcquired
-		stats.NumSessionsExhausted += stat.NumSessionsExhausted
-	}
+	stats := c.cfg.ClientMgr.Stats()
 
 	return &StatsResponse{
 		NumBackups:           uint32(stats.NumTasksAccepted),

watchtower/wtclient/client.go

@@ -104,9 +104,6 @@ type Client interface {
 	LookupTower(*btcec.PublicKey,
 		...wtdb.ClientSessionListOption) (*RegisteredTower, error)
 
-	// Stats returns the in-memory statistics of the client since startup.
-	Stats() ClientStats
-
 	// Policy returns the active client policy configuration.
 	Policy() wtpolicy.Policy
 
@@ -1635,8 +1632,8 @@ func (c *TowerClient) LookupTower(pubKey *btcec.PublicKey,
 	}, nil
 }
 
-// Stats returns the in-memory statistics of the client since startup.
-func (c *TowerClient) Stats() ClientStats {
+// getStats returns the in-memory statistics of the client since startup.
+func (c *TowerClient) getStats() ClientStats {
 	return c.stats.getStatsCopy()
 }
 

watchtower/wtclient/manager.go

@@ -33,6 +33,9 @@ type TowerClientManager interface {
 	// only serves as a way of removing the address from the watchtower
 	// instead.
 	RemoveTower(*btcec.PublicKey, net.Addr) error
+
+	// Stats returns the in-memory statistics of the client since startup.
+	Stats() ClientStats
 }
 
 // Config provides the TowerClient with access to the resources it requires to
@@ -299,3 +302,22 @@ func (m *Manager) RemoveTower(key *btcec.PublicKey, addr net.Addr) error {
 
 	return nil
 }
+
+// Stats returns the in-memory statistics of the clients managed by the Manager
+// since startup.
+func (m *Manager) Stats() ClientStats {
+	m.clientsMu.Lock()
+	defer m.clientsMu.Unlock()
+
+	var resp ClientStats
+	for _, client := range m.clients {
+		stats := client.getStats()
+		resp.NumTasksAccepted += stats.NumTasksAccepted
+		resp.NumTasksIneligible += stats.NumTasksIneligible
+		resp.NumTasksPending += stats.NumTasksPending
+		resp.NumSessionsAcquired += stats.NumSessionsAcquired
+		resp.NumSessionsExhausted += stats.NumSessionsExhausted
+	}
+
+	return resp
+}