invoices: use lntypes.Hash and lntypes.Preimage

Previously chainhash.Hash was used, which converts to/from string in
reversed format. Payment hashes and preimages are supposed to be
non-reversed.

htlcswitch/interfaces.go

@@ -1,9 +1,9 @@
 package htlcswitch
 
 import (
-	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/lnpeer"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
 )
 
@@ -14,11 +14,11 @@ type InvoiceDatabase interface {
 	// byte payment hash. This method should also reutrn the min final CLTV
 	// delta for this invoice. We'll use this to ensure that the HTLC
 	// extended to us gives us enough time to settle as we prescribe.
-	LookupInvoice(chainhash.Hash) (channeldb.Invoice, uint32, error)
+	LookupInvoice(lntypes.Hash) (channeldb.Invoice, uint32, error)
 
 	// SettleInvoice attempts to mark an invoice corresponding to the
 	// passed payment hash as fully settled.
-	SettleInvoice(payHash chainhash.Hash, paidAmount lnwire.MilliSatoshi) error
+	SettleInvoice(payHash lntypes.Hash, paidAmount lnwire.MilliSatoshi) error
 }
 
 // ChannelLink is an interface which represents the subsystem for managing the

htlcswitch/link.go

@@ -9,7 +9,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/davecgh/go-spew/spew"
 	"github.com/go-errors/errors"
 	"github.com/lightningnetwork/lnd/channeldb"
@@ -17,6 +16,7 @@ import (
 	"github.com/lightningnetwork/lnd/htlcswitch/hodl"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnpeer"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/ticker"
@@ -2312,7 +2312,7 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 			// We're the designated payment destination.  Therefore
 			// we attempt to see if we have an invoice locally
 			// which'll allow us to settle this htlc.
-			invoiceHash := chainhash.Hash(pd.RHash)
+			invoiceHash := lntypes.Hash(pd.RHash)
 			invoice, minCltvDelta, err := l.cfg.Registry.LookupInvoice(
 				invoiceHash,
 			)

htlcswitch/mock.go

@@ -17,7 +17,6 @@ import (
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
-	"github.com/btcsuite/fastsha256"
 	"github.com/go-errors/errors"
 	"github.com/lightningnetwork/lightning-onion"
 	"github.com/lightningnetwork/lnd/chainntnfs"
@@ -25,6 +24,7 @@ import (
 	"github.com/lightningnetwork/lnd/contractcourt"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnpeer"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/ticker"
@@ -686,18 +686,18 @@ var _ ChannelLink = (*mockChannelLink)(nil)
 type mockInvoiceRegistry struct {
 	sync.Mutex
 
-	invoices   map[chainhash.Hash]channeldb.Invoice
+	invoices   map[lntypes.Hash]channeldb.Invoice
 	finalDelta uint32
 }
 
 func newMockRegistry(minDelta uint32) *mockInvoiceRegistry {
 	return &mockInvoiceRegistry{
 		finalDelta: minDelta,
-		invoices:   make(map[chainhash.Hash]channeldb.Invoice),
+		invoices:   make(map[lntypes.Hash]channeldb.Invoice),
 	}
 }
 
-func (i *mockInvoiceRegistry) LookupInvoice(rHash chainhash.Hash) (channeldb.Invoice, uint32, error) {
+func (i *mockInvoiceRegistry) LookupInvoice(rHash lntypes.Hash) (channeldb.Invoice, uint32, error) {
 	i.Lock()
 	defer i.Unlock()
 
@@ -710,7 +710,7 @@ func (i *mockInvoiceRegistry) LookupInvoice(rHash chainhash.Hash) (channeldb.Inv
 	return invoice, i.finalDelta, nil
 }
 
-func (i *mockInvoiceRegistry) SettleInvoice(rhash chainhash.Hash,
+func (i *mockInvoiceRegistry) SettleInvoice(rhash lntypes.Hash,
 	amt lnwire.MilliSatoshi) error {
 
 	i.Lock()
@@ -736,8 +736,8 @@ func (i *mockInvoiceRegistry) AddInvoice(invoice channeldb.Invoice) error {
 	i.Lock()
 	defer i.Unlock()
 
-	rhash := fastsha256.Sum256(invoice.Terms.PaymentPreimage[:])
-	i.invoices[chainhash.Hash(rhash)] = invoice
+	rhash := invoice.Terms.PaymentPreimage.Hash()
+	i.invoices[rhash] = invoice
 
 	return nil
 }

htlcswitch/test_utils.go

@@ -27,6 +27,7 @@ import (
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnpeer"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/shachain"
@@ -651,11 +652,11 @@ func generateHops(payAmt lnwire.MilliSatoshi, startingHeight uint32,
 }
 
 type paymentResponse struct {
-	rhash chainhash.Hash
+	rhash lntypes.Hash
 	err   chan error
 }
 
-func (r *paymentResponse) Wait(d time.Duration) (chainhash.Hash, error) {
+func (r *paymentResponse) Wait(d time.Duration) (lntypes.Hash, error) {
 	select {
 	case err := <-r.err:
 		close(r.err)
@@ -680,7 +681,7 @@ func (n *threeHopNetwork) makePayment(sendingPeer, receivingPeer lnpeer.Peer,
 
 	paymentErr := make(chan error, 1)
 
-	var rhash chainhash.Hash
+	var rhash lntypes.Hash
 
 	sender := sendingPeer.(*mockServer)
 	receiver := receivingPeer.(*mockServer)