lnwallet: add configurable cache for web fee estimator

Add fee.min-update-timeout and fee.max-update-timeout config options to
allow configuration of the web fee estimator cache.

htlcswitch/link.go

@@ -202,15 +202,15 @@ type ChannelLinkConfig struct {
 	// receiving node is persistent.
 	UnsafeReplay bool
 
-	// MinFeeUpdateTimeout represents the minimum interval in which a link
+	// MinUpdateTimeout represents the minimum interval in which a link
 	// will propose to update its commitment fee rate. A random timeout will
-	// be selected between this and MaxFeeUpdateTimeout.
-	MinFeeUpdateTimeout time.Duration
+	// be selected between this and MaxUpdateTimeout.
+	MinUpdateTimeout time.Duration
 
-	// MaxFeeUpdateTimeout represents the maximum interval in which a link
+	// MaxUpdateTimeout represents the maximum interval in which a link
 	// will propose to update its commitment fee rate. A random timeout will
-	// be selected between this and MinFeeUpdateTimeout.
-	MaxFeeUpdateTimeout time.Duration
+	// be selected between this and MinUpdateTimeout.
+	MaxUpdateTimeout time.Duration
 
 	// OutgoingCltvRejectDelta defines the number of blocks before expiry of
 	// an htlc where we don't offer an htlc anymore. This should be at least
@@ -1558,8 +1558,8 @@ func getResolutionFailure(resolution *invoices.HtlcFailResolution,
 // within the link's configuration that will be used to determine when the link
 // should propose an update to its commitment fee rate.
 func (l *channelLink) randomFeeUpdateTimeout() time.Duration {
-	lower := int64(l.cfg.MinFeeUpdateTimeout)
-	upper := int64(l.cfg.MaxFeeUpdateTimeout)
+	lower := int64(l.cfg.MinUpdateTimeout)
+	upper := int64(l.cfg.MaxUpdateTimeout)
 	return time.Duration(prand.Int63n(upper-lower) + lower)
 }
 

htlcswitch/link_test.go

@@ -2220,11 +2220,11 @@ func newSingleLinkTestHarness(t *testing.T, chanAmt,
 		BatchTicker:          bticker,
 		FwdPkgGCTicker:       ticker.NewForce(15 * time.Second),
 		PendingCommitTicker:  ticker.New(time.Minute),
-		// Make the BatchSize and Min/MaxFeeUpdateTimeout large enough
+		// Make the BatchSize and Min/MaxUpdateTimeout large enough
 		// to not trigger commit updates automatically during tests.
 		BatchSize:               10000,
-		MinFeeUpdateTimeout:     30 * time.Minute,
-		MaxFeeUpdateTimeout:     40 * time.Minute,
+		MinUpdateTimeout:        30 * time.Minute,
+		MaxUpdateTimeout:        40 * time.Minute,
 		MaxOutgoingCltvExpiry:   DefaultMaxOutgoingCltvExpiry,
 		MaxFeeAllocation:        DefaultMaxLinkFeeAllocation,
 		NotifyActiveLink:        func(wire.OutPoint) {},
@@ -4881,11 +4881,11 @@ func (h *persistentLinkHarness) restartLink(
 		BatchTicker:          bticker,
 		FwdPkgGCTicker:       ticker.New(5 * time.Second),
 		PendingCommitTicker:  ticker.New(time.Minute),
-		// Make the BatchSize and Min/MaxFeeUpdateTimeout large enough
+		// Make the BatchSize and Min/MaxUpdateTimeout large enough
 		// to not trigger commit updates automatically during tests.
-		BatchSize:           10000,
-		MinFeeUpdateTimeout: 30 * time.Minute,
-		MaxFeeUpdateTimeout: 40 * time.Minute,
+		BatchSize:        10000,
+		MinUpdateTimeout: 30 * time.Minute,
+		MaxUpdateTimeout: 40 * time.Minute,
 		// Set any hodl flags requested for the new link.
 		HodlMask:                hodl.MaskFromFlags(hodlFlags...),
 		MaxOutgoingCltvExpiry:   DefaultMaxOutgoingCltvExpiry,

htlcswitch/test_utils.go

@@ -1155,8 +1155,8 @@ func (h *hopNetwork) createChannelLink(server, peer *mockServer,
 			BatchTicker:             ticker.NewForce(testBatchTimeout),
 			FwdPkgGCTicker:          ticker.NewForce(fwdPkgTimeout),
 			PendingCommitTicker:     ticker.New(2 * time.Minute),
-			MinFeeUpdateTimeout:     minFeeUpdateTimeout,
-			MaxFeeUpdateTimeout:     maxFeeUpdateTimeout,
+			MinUpdateTimeout:        minFeeUpdateTimeout,
+			MaxUpdateTimeout:        maxFeeUpdateTimeout,
 			OnChannelFailure:        func(lnwire.ChannelID, lnwire.ShortChannelID, LinkFailureError) {},
 			OutgoingCltvRejectDelta: 3,
 			MaxOutgoingCltvExpiry:   DefaultMaxOutgoingCltvExpiry,