invoices: add RegistryConfig struct

htlcswitch/mock.go

@@ -790,9 +790,12 @@ func newMockRegistry(minDelta uint32) *mockInvoiceRegistry {
 		panic(err)
 	}
 
-	finalCltvRejectDelta := int32(5)
-
-	registry := invoices.NewRegistry(cdb, finalCltvRejectDelta)
+	registry := invoices.NewRegistry(
+		cdb,
+		&invoices.RegistryConfig{
+			FinalCltvRejectDelta: 5,
+		},
+	)
 	registry.Start()
 
 	return &mockInvoiceRegistry{

invoices/invoiceregistry.go

@@ -41,6 +41,16 @@ type HodlEvent struct {
 	AcceptHeight int32
 }
 
+// RegistryConfig contains the configuration parameters for invoice registry.
+type RegistryConfig struct {
+	// FinalCltvRejectDelta defines the number of blocks before the expiry
+	// of the htlc where we no longer settle it as an exit hop and instead
+	// cancel it back. Normally this value should be lower than the cltv
+	// expiry of any invoice we create and the code effectuating this should
+	// not be hit.
+	FinalCltvRejectDelta int32
+}
+
 // InvoiceRegistry is a central registry of all the outstanding invoices
 // created by the daemon. The registry is a thin wrapper around a map in order
 // to ensure that all updates/reads are thread safe.
@@ -49,6 +59,9 @@ type InvoiceRegistry struct {
 
 	cdb *channeldb.DB
 
+	// cfg contains the registry's configuration parameters.
+	cfg *RegistryConfig
+
 	clientMtx                 sync.Mutex
 	nextClientID              uint32
 	notificationClients       map[uint32]*InvoiceSubscription
@@ -69,13 +82,6 @@ type InvoiceRegistry struct {
 	// subscriber. This is used to unsubscribe from all hashes efficiently.
 	hodlReverseSubscriptions map[chan<- interface{}]map[channeldb.CircuitKey]struct{}
 
-	// finalCltvRejectDelta defines the number of blocks before the expiry
-	// of the htlc where we no longer settle it as an exit hop and instead
-	// cancel it back. Normally this value should be lower than the cltv
-	// expiry of any invoice we create and the code effectuating this should
-	// not be hit.
-	finalCltvRejectDelta int32
-
 	wg   sync.WaitGroup
 	quit chan struct{}
 }
@@ -84,7 +90,7 @@ type InvoiceRegistry struct {
 // wraps the persistent on-disk invoice storage with an additional in-memory
 // layer. The in-memory layer is in place such that debug invoices can be added
 // which are volatile yet available system wide within the daemon.
-func NewRegistry(cdb *channeldb.DB, finalCltvRejectDelta int32) *InvoiceRegistry {
+func NewRegistry(cdb *channeldb.DB, cfg *RegistryConfig) *InvoiceRegistry {
 
 	return &InvoiceRegistry{
 		cdb:                       cdb,
@@ -95,7 +101,7 @@ func NewRegistry(cdb *channeldb.DB, finalCltvRejectDelta int32) *InvoiceRegistry
 		invoiceEvents:             make(chan interface{}, 100),
 		hodlSubscriptions:         make(map[channeldb.CircuitKey]map[chan<- interface{}]struct{}),
 		hodlReverseSubscriptions:  make(map[chan<- interface{}]map[channeldb.CircuitKey]struct{}),
-		finalCltvRejectDelta:      finalCltvRejectDelta,
+		cfg:                       cfg,
 		quit:                      make(chan struct{}),
 	}
 }
@@ -442,7 +448,7 @@ func (i *InvoiceRegistry) NotifyExitHopHtlc(rHash lntypes.Hash,
 		amtPaid:              amtPaid,
 		expiry:               expiry,
 		currentHeight:        currentHeight,
-		finalCltvRejectDelta: i.finalCltvRejectDelta,
+		finalCltvRejectDelta: i.cfg.FinalCltvRejectDelta,
 		customRecords:        payload.CustomRecords(),
 	}
 

invoices/invoiceregistry_test.go

@@ -71,7 +71,10 @@ func newTestContext(t *testing.T) *testContext {
 	}
 
 	// Instantiate and start the invoice ctx.registry.
-	registry := NewRegistry(cdb, testFinalCltvRejectDelta)
+	cfg := RegistryConfig{
+		FinalCltvRejectDelta: testFinalCltvRejectDelta,
+	}
+	registry := NewRegistry(cdb, &cfg)
 
 	err = registry.Start()
 	if err != nil {
@@ -390,7 +393,10 @@ func TestSettleHoldInvoice(t *testing.T) {
 	defer cleanup()
 
 	// Instantiate and start the invoice ctx.registry.
-	registry := NewRegistry(cdb, testFinalCltvRejectDelta)
+	cfg := RegistryConfig{
+		FinalCltvRejectDelta: testFinalCltvRejectDelta,
+	}
+	registry := NewRegistry(cdb, &cfg)
 
 	err = registry.Start()
 	if err != nil {
@@ -558,7 +564,10 @@ func TestCancelHoldInvoice(t *testing.T) {
 	defer cleanup()
 
 	// Instantiate and start the invoice ctx.registry.
-	registry := NewRegistry(cdb, testFinalCltvRejectDelta)
+	cfg := RegistryConfig{
+		FinalCltvRejectDelta: testFinalCltvRejectDelta,
+	}
+	registry := NewRegistry(cdb, &cfg)
 
 	err = registry.Start()
 	if err != nil {

server.go

@@ -378,6 +378,10 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB,
 		return nil, err
 	}
 
+	registryConfig := invoices.RegistryConfig{
+		FinalCltvRejectDelta: defaultFinalCltvRejectDelta,
+	}
+
 	s := &server{
 		chanDB:         chanDB,
 		cc:             cc,
@@ -386,9 +390,7 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB,
 		readPool:       readPool,
 		chansToRestore: chansToRestore,
 
-		invoices: invoices.NewRegistry(
-			chanDB, defaultFinalCltvRejectDelta,
-		),
+		invoices: invoices.NewRegistry(chanDB, &registryConfig),
 
 		channelNotifier: channelnotifier.New(chanDB),