wtclient+lnrpc: move Policy to Manager

lnrpc/wtclientrpc/wtclient.go

@@ -16,9 +16,9 @@ import (
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/watchtower"
+	"github.com/lightningnetwork/lnd/watchtower/blob"
 	"github.com/lightningnetwork/lnd/watchtower/wtclient"
 	"github.com/lightningnetwork/lnd/watchtower/wtdb"
-	"github.com/lightningnetwork/lnd/watchtower/wtpolicy"
 	"google.golang.org/grpc"
 	"gopkg.in/macaroon-bakery.v2/bakery"
 )
@@ -437,17 +437,22 @@ func (c *WatchtowerClient) Policy(ctx context.Context,
 		return nil, err
 	}
 
-	var policy wtpolicy.Policy
+	var blobType blob.Type
 	switch req.PolicyType {
 	case PolicyType_LEGACY:
-		policy = c.cfg.Client.Policy()
+		blobType = blob.TypeAltruistCommit
 	case PolicyType_ANCHOR:
-		policy = c.cfg.AnchorClient.Policy()
+		blobType = blob.TypeAltruistAnchorCommit
 	default:
 		return nil, fmt.Errorf("unknown policy type: %v",
 			req.PolicyType)
 	}
 
+	policy, err := c.cfg.ClientMgr.Policy(blobType)
+	if err != nil {
+		return nil, err
+	}
+
 	return &PolicyResponse{
 		MaxUpdates:       uint32(policy.MaxUpdates),
 		SweepSatPerVbyte: uint32(policy.SweepFeeRate.FeePerVByte()),

watchtower/wtclient/client.go

@@ -95,9 +95,6 @@ type RegisteredTower struct {
 // Client is the primary interface used by the daemon to control a client's
 // lifecycle and backup revoked states.
 type Client interface {
-	// Policy returns the active client policy configuration.
-	Policy() wtpolicy.Policy
-
 	// RegisterChannel persistently initializes any channel-dependent
 	// parameters within the client. This should be called during link
 	// startup to ensure that the client is able to support the link during
@@ -1620,8 +1617,8 @@ func (c *TowerClient) getStats() ClientStats {
 	return c.stats.getStatsCopy()
 }
 
-// Policy returns the active client policy configuration.
-func (c *TowerClient) Policy() wtpolicy.Policy {
+// policy returns the active client policy configuration.
+func (c *TowerClient) policy() wtpolicy.Policy {
 	return c.cfg.Policy
 }
 

watchtower/wtclient/manager.go

@@ -38,6 +38,9 @@ type TowerClientManager interface {
 	// Stats returns the in-memory statistics of the client since startup.
 	Stats() ClientStats
 
+	// Policy returns the active client policy configuration.
+	Policy(blob.Type) (wtpolicy.Policy, error)
+
 	// RegisteredTowers retrieves the list of watchtowers registered with
 	// the client. It returns a set of registered towers per client policy
 	// type.
@@ -353,7 +356,7 @@ func (m *Manager) RegisteredTowers(opts ...wtdb.ClientSessionListOption) (
 			return nil, err
 		}
 
-		resp[client.Policy().BlobType] = towers
+		resp[client.policy().BlobType] = towers
 	}
 
 	return resp, nil
@@ -379,8 +382,23 @@ func (m *Manager) LookupTower(key *btcec.PublicKey,
 			return nil, err
 		}
 
-		resp[client.Policy().BlobType] = tower
+		resp[client.policy().BlobType] = tower
 	}
 
 	return resp, nil
 }
+
+// Policy returns the active client policy configuration for the client using
+// the given blob type.
+func (m *Manager) Policy(blobType blob.Type) (wtpolicy.Policy, error) {
+	m.clientsMu.Lock()
+	defer m.clientsMu.Unlock()
+
+	var policy wtpolicy.Policy
+	client, ok := m.clients[blobType]
+	if !ok {
+		return policy, fmt.Errorf("no client for the given blob type")
+	}
+
+	return client.policy(), nil
+}