multi: extend InvoiceDB methods with a context argument (#8066)

* multi: extend InvoiceDB methods with a context argument

This commit adds a context to InvoiceDB's methods. Along this refactor
we also extend InvoiceRegistry methods with contexts where it makes
sense. This change is essential to be able to provide kvdb and sqldb
implementations for InvoiceDB.

* channeldb: restrict invoice tests to only use an InvoiceDB instance

* docs: update release notes for 0.18.0

invoices/invoiceregistry_test.go

@@ -1,6 +1,7 @@
 package invoices_test
 
 import (
+	"context"
 	"crypto/rand"
 	"math"
 	"testing"
@@ -23,13 +24,14 @@ func TestSettleInvoice(t *testing.T) {
 
 	ctx := newTestContext(t, nil)
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
+	ctxb := context.Background()
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
 	require.Nil(t, err)
 	defer allSubscriptions.Cancel()
 
 	// Subscribe to the not yet existing invoice.
 	subscription, err := ctx.registry.SubscribeSingleInvoice(
-		testInvoicePaymentHash,
+		ctxb, testInvoicePaymentHash,
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -41,7 +43,7 @@ func TestSettleInvoice(t *testing.T) {
 	// Add the invoice.
 	testInvoice := newInvoice(t, false)
 	addIdx, err := ctx.registry.AddInvoice(
-		testInvoice, testInvoicePaymentHash,
+		ctxb, testInvoice, testInvoicePaymentHash,
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -174,7 +176,7 @@ func TestSettleInvoice(t *testing.T) {
 
 	// Check that settled amount is equal to the sum of values of the htlcs
 	// 0 and 1.
-	inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
+	inv, err := ctx.registry.LookupInvoice(ctxb, testInvoicePaymentHash)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -184,7 +186,7 @@ func TestSettleInvoice(t *testing.T) {
 	}
 
 	// Try to cancel.
-	err = ctx.registry.CancelInvoice(testInvoicePaymentHash)
+	err = ctx.registry.CancelInvoice(ctxb, testInvoicePaymentHash)
 	require.ErrorIs(t, err, invpkg.ErrInvoiceAlreadySettled)
 
 	// As this is a direct settle, we expect nothing on the hodl chan.
@@ -205,31 +207,30 @@ func testCancelInvoice(t *testing.T, gc bool) {
 	cfg.GcCanceledInvoicesOnTheFly = gc
 	ctx := newTestContext(t, &cfg)
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
+	ctxb := context.Background()
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
 	require.Nil(t, err)
 	defer allSubscriptions.Cancel()
 
 	// Try to cancel the not yet existing invoice. This should fail.
-	err = ctx.registry.CancelInvoice(testInvoicePaymentHash)
+	err = ctx.registry.CancelInvoice(ctxb, testInvoicePaymentHash)
 	require.ErrorIs(t, err, invpkg.ErrInvoiceNotFound)
 
 	// Subscribe to the not yet existing invoice.
 	subscription, err := ctx.registry.SubscribeSingleInvoice(
-		testInvoicePaymentHash,
+		ctxb, testInvoicePaymentHash,
 	)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	defer subscription.Cancel()
 
 	require.Equal(t, subscription.PayHash(), &testInvoicePaymentHash)
 
 	// Add the invoice.
 	testInvoice := newInvoice(t, false)
-	_, err = ctx.registry.AddInvoice(testInvoice, testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	_, err = ctx.registry.AddInvoice(
+		ctxb, testInvoice, testInvoicePaymentHash,
+	)
+	require.NoError(t, err)
 
 	// We expect the open state to be sent to the single invoice subscriber.
 	select {
@@ -258,10 +259,8 @@ func testCancelInvoice(t *testing.T, gc bool) {
 	}
 
 	// Cancel invoice.
-	err = ctx.registry.CancelInvoice(testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	err = ctx.registry.CancelInvoice(ctxb, testInvoicePaymentHash)
+	require.NoError(t, err)
 
 	// We expect the canceled state to be sent to the single invoice
 	// subscriber.
@@ -280,7 +279,7 @@ func testCancelInvoice(t *testing.T, gc bool) {
 	if gc {
 		// Check that the invoice has been deleted from the db.
 		_, err = ctx.idb.LookupInvoice(
-			invpkg.InvoiceRefByHash(testInvoicePaymentHash),
+			ctxb, invpkg.InvoiceRefByHash(testInvoicePaymentHash),
 		)
 		require.Error(t, err)
 	}
@@ -291,7 +290,7 @@ func testCancelInvoice(t *testing.T, gc bool) {
 	// Try to cancel again. Expect that we report ErrInvoiceNotFound if the
 	// invoice has been garbage collected (since the invoice has been
 	// deleted when it was canceled), and no error otherwise.
-	err = ctx.registry.CancelInvoice(testInvoicePaymentHash)
+	err = ctx.registry.CancelInvoice(ctxb, testInvoicePaymentHash)
 
 	if gc {
 		require.Error(t, err, invpkg.ErrInvoiceNotFound)
@@ -366,32 +365,27 @@ func TestSettleHoldInvoice(t *testing.T) {
 	registry := invpkg.NewRegistry(idb, expiryWatcher, &cfg)
 
 	err = registry.Start()
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	defer registry.Stop()
 
-	allSubscriptions, err := registry.SubscribeNotifications(0, 0)
+	ctxb := context.Background()
+	allSubscriptions, err := registry.SubscribeNotifications(ctxb, 0, 0)
 	require.Nil(t, err)
 	defer allSubscriptions.Cancel()
 
 	// Subscribe to the not yet existing invoice.
 	subscription, err := registry.SubscribeSingleInvoice(
-		testInvoicePaymentHash,
+		ctxb, testInvoicePaymentHash,
 	)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	defer subscription.Cancel()
 
 	require.Equal(t, subscription.PayHash(), &testInvoicePaymentHash)
 
 	// Add the invoice.
 	invoice := newInvoice(t, true)
-	_, err = registry.AddInvoice(invoice, testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	_, err = registry.AddInvoice(ctxb, invoice, testInvoicePaymentHash)
+	require.NoError(t, err)
 
 	// We expect the open state to be sent to the single invoice subscriber.
 	update := <-subscription.Updates
@@ -475,10 +469,8 @@ func TestSettleHoldInvoice(t *testing.T) {
 	}
 
 	// Settling with preimage should succeed.
-	err = registry.SettleHodlInvoice(testInvoicePreimage)
-	if err != nil {
-		t.Fatal("expected set preimage to succeed")
-	}
+	err = registry.SettleHodlInvoice(ctxb, testInvoicePreimage)
+	require.NoError(t, err, "expected set preimage to succeed")
 
 	htlcResolution, _ := (<-hodlChan).(invpkg.HtlcResolution)
 	require.NotNil(t, htlcResolution)
@@ -507,14 +499,14 @@ func TestSettleHoldInvoice(t *testing.T) {
 	}
 
 	// Idempotency.
-	err = registry.SettleHodlInvoice(testInvoicePreimage)
+	err = registry.SettleHodlInvoice(ctxb, testInvoicePreimage)
 	require.ErrorIs(t, err, invpkg.ErrInvoiceAlreadySettled)
 
 	// Try to cancel.
-	err = registry.CancelInvoice(testInvoicePaymentHash)
-	if err == nil {
-		t.Fatal("expected cancellation of a settled invoice to fail")
-	}
+	err = registry.CancelInvoice(ctxb, testInvoicePaymentHash)
+	require.Error(
+		t, err, "expected cancellation of a settled invoice to fail",
+	)
 }
 
 // TestCancelHoldInvoice tests canceling of a hold invoice and related
@@ -545,12 +537,12 @@ func TestCancelHoldInvoice(t *testing.T) {
 		require.NoError(t, registry.Stop())
 	})
 
+	ctxb := context.Background()
+
 	// Add the invoice.
 	invoice := newInvoice(t, true)
-	_, err = registry.AddInvoice(invoice, testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	_, err = registry.AddInvoice(ctxb, invoice, testInvoicePaymentHash)
+	require.NoError(t, err)
 
 	amtPaid := lnwire.MilliSatoshi(100000)
 	hodlChan := make(chan interface{}, 1)
@@ -569,10 +561,8 @@ func TestCancelHoldInvoice(t *testing.T) {
 	}
 
 	// Cancel invoice.
-	err = registry.CancelInvoice(testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal("cancel invoice failed")
-	}
+	err = registry.CancelInvoice(ctxb, testInvoicePaymentHash)
+	require.NoError(t, err, "cancel invoice failed")
 
 	htlcResolution, _ := (<-hodlChan).(invpkg.HtlcResolution)
 	require.NotNil(t, htlcResolution)
@@ -642,8 +632,10 @@ func testKeySend(t *testing.T, keySendEnabled bool) {
 	cfg.AcceptKeySend = keySendEnabled
 	ctx := newTestContext(t, &cfg)
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
-	require.Nil(t, err)
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(
+		context.Background(), 0, 0,
+	)
+	require.NoError(t, err)
 	defer allSubscriptions.Cancel()
 
 	hodlChan := make(chan interface{}, 1)
@@ -772,8 +764,9 @@ func testHoldKeysend(t *testing.T, timeoutKeysend bool) {
 	cfg.KeysendHoldTime = holdDuration
 	ctx := newTestContext(t, &cfg)
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
-	require.Nil(t, err)
+	ctxb := context.Background()
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
+	require.NoError(t, err)
 	defer allSubscriptions.Cancel()
 
 	hodlChan := make(chan interface{}, 1)
@@ -840,8 +833,8 @@ func testHoldKeysend(t *testing.T, timeoutKeysend bool) {
 	}
 
 	// Settle keysend payment manually.
-	require.Nil(t, ctx.registry.SettleHodlInvoice(
-		*newInvoice.Terms.PaymentPreimage,
+	require.NoError(t, ctx.registry.SettleHodlInvoice(
+		ctxb, *newInvoice.Terms.PaymentPreimage,
 	))
 
 	// We expect a settled notification to be sent out.
@@ -857,13 +850,14 @@ func TestMppPayment(t *testing.T) {
 	defer timeout()()
 
 	ctx := newTestContext(t, nil)
+	ctxb := context.Background()
 
 	// Add the invoice.
 	testInvoice := newInvoice(t, false)
-	_, err := ctx.registry.AddInvoice(testInvoice, testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	_, err := ctx.registry.AddInvoice(
+		ctxb, testInvoice, testInvoicePaymentHash,
+	)
+	require.NoError(t, err)
 
 	mppPayload := &mockPayload{
 		mpp: record.NewMPP(testInvoiceAmount, [32]byte{}),
@@ -933,10 +927,8 @@ func TestMppPayment(t *testing.T) {
 
 	// Check that settled amount is equal to the sum of values of the htlcs
 	// 2 and 3.
-	inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
-	if err != nil {
-		t.Fatal(err)
-	}
+	inv, err := ctx.registry.LookupInvoice(ctxb, testInvoicePaymentHash)
+	require.NoError(t, err)
 	if inv.State != invpkg.ContractSettled {
 		t.Fatal("expected invoice to be settled")
 	}
@@ -952,17 +944,16 @@ func TestMppPayment(t *testing.T) {
 func TestMppPaymentWithOverpayment(t *testing.T) {
 	t.Parallel()
 
+	ctxb := context.Background()
 	f := func(overpaymentRand uint64) bool {
 		ctx := newTestContext(t, nil)
 
 		// Add the invoice.
 		testInvoice := newInvoice(t, false)
 		_, err := ctx.registry.AddInvoice(
-			testInvoice, testInvoicePaymentHash,
+			ctxb, testInvoice, testInvoicePaymentHash,
 		)
-		if err != nil {
-			t.Fatal(err)
-		}
+		require.NoError(t, err)
 
 		mppPayload := &mockPayload{
 			mpp: record.NewMPP(testInvoiceAmount, [32]byte{}),
@@ -1009,10 +1000,10 @@ func TestMppPaymentWithOverpayment(t *testing.T) {
 
 		// Check that settled amount is equal to the sum of values of
 		// the htlcs 1 and 2.
-		inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
-		if err != nil {
-			t.Fatal(err)
-		}
+		inv, err := ctx.registry.LookupInvoice(
+			ctxb, testInvoicePaymentHash,
+		)
+		require.NoError(t, err)
 		if inv.State != invpkg.ContractSettled {
 			t.Fatal("expected invoice to be settled")
 		}
@@ -1050,10 +1041,12 @@ func TestInvoiceExpiryWithRegistry(t *testing.T) {
 		t, testTime, 0, numExpired, numPending,
 	)
 
+	ctxb := context.Background()
+
 	var expectedCancellations []lntypes.Hash
 	expiredInvoices := existingInvoices.expiredInvoices
 	for paymentHash, expiredInvoice := range expiredInvoices {
-		_, err := idb.AddInvoice(expiredInvoice, paymentHash)
+		_, err := idb.AddInvoice(ctxb, expiredInvoice, paymentHash)
 		require.NoError(t, err)
 		expectedCancellations = append(
 			expectedCancellations, paymentHash,
@@ -1062,7 +1055,7 @@ func TestInvoiceExpiryWithRegistry(t *testing.T) {
 
 	pendingInvoices := existingInvoices.pendingInvoices
 	for paymentHash, pendingInvoice := range pendingInvoices {
-		_, err := idb.AddInvoice(pendingInvoice, paymentHash)
+		_, err := idb.AddInvoice(ctxb, pendingInvoice, paymentHash)
 		require.NoError(t, err)
 	}
 
@@ -1078,24 +1071,20 @@ func TestInvoiceExpiryWithRegistry(t *testing.T) {
 
 	var invoicesThatWillCancel []lntypes.Hash
 	for paymentHash, pendingInvoice := range newInvoices.pendingInvoices {
-		_, err := registry.AddInvoice(pendingInvoice, paymentHash)
+		_, err := registry.AddInvoice(ctxb, pendingInvoice, paymentHash)
+		require.NoError(t, err)
 		invoicesThatWillCancel = append(
 			invoicesThatWillCancel, paymentHash,
 		)
-		if err != nil {
-			t.Fatal(err)
-		}
 	}
 
 	// Check that they are really not canceled until before the clock is
 	// advanced.
 	for i := range invoicesThatWillCancel {
 		invoice, err := registry.LookupInvoice(
-			invoicesThatWillCancel[i],
+			ctxb, invoicesThatWillCancel[i],
 		)
-		if err != nil {
-			t.Fatalf("cannot find invoice: %v", err)
-		}
+		require.NoError(t, err, "cannot find invoice")
 
 		if invoice.State == invpkg.ContractCanceled {
 			t.Fatalf("expected pending invoice, got canceled")
@@ -1115,7 +1104,7 @@ func TestInvoiceExpiryWithRegistry(t *testing.T) {
 	canceled := func() bool {
 		for i := range expectedCancellations {
 			invoice, err := registry.LookupInvoice(
-				expectedCancellations[i],
+				ctxb, expectedCancellations[i],
 			)
 			require.NoError(t, err)
 
@@ -1162,6 +1151,8 @@ func TestOldInvoiceRemovalOnStart(t *testing.T) {
 		t, testTime, 0, numExpired, numPending,
 	)
 
+	ctxb := context.Background()
+
 	i := 0
 	for paymentHash, invoice := range existingInvoices.expiredInvoices {
 		// Mark half of the invoices as settled, the other half as
@@ -1172,7 +1163,7 @@ func TestOldInvoiceRemovalOnStart(t *testing.T) {
 			invoice.State = invpkg.ContractCanceled
 		}
 
-		_, err := idb.AddInvoice(invoice, paymentHash)
+		_, err := idb.AddInvoice(ctxb, invoice, paymentHash)
 		require.NoError(t, err)
 		i++
 	}
@@ -1186,7 +1177,7 @@ func TestOldInvoiceRemovalOnStart(t *testing.T) {
 		NumMaxInvoices: math.MaxUint64,
 	}
 
-	response, err := idb.QueryInvoices(query)
+	response, err := idb.QueryInvoices(ctxb, query)
 	require.NoError(t, err)
 
 	// Save all settled invoices for our expectation set.
@@ -1202,7 +1193,7 @@ func TestOldInvoiceRemovalOnStart(t *testing.T) {
 	require.NoError(t, err, "cannot start the registry")
 
 	// Perform a scan query to collect all invoices.
-	response, err = idb.QueryInvoices(query)
+	response, err = idb.QueryInvoices(ctxb, query)
 	require.NoError(t, err)
 
 	// Check that we really only kept the settled invoices after the
@@ -1248,7 +1239,10 @@ func testHeightExpiryWithRegistry(t *testing.T, numParts int, settle bool) {
 	testInvoice.HodlInvoice = true
 	testInvoice.PaymentRequest = []byte{1, 2, 3}
 
-	_, err := ctx.registry.AddInvoice(testInvoice, testInvoicePaymentHash)
+	ctxb := context.Background()
+	_, err := ctx.registry.AddInvoice(
+		ctxb, testInvoice, testInvoicePaymentHash,
+	)
 	require.NoError(t, err)
 
 	payLoad := testPayload
@@ -1275,7 +1269,9 @@ func testHeightExpiryWithRegistry(t *testing.T, numParts int, settle bool) {
 	}
 
 	require.Eventually(t, func() bool {
-		inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
+		inv, err := ctx.registry.LookupInvoice(
+			ctxb, testInvoicePaymentHash,
+		)
 		require.NoError(t, err)
 
 		return inv.State == invpkg.ContractAccepted
@@ -1299,7 +1295,7 @@ func testHeightExpiryWithRegistry(t *testing.T, numParts int, settle bool) {
 
 	// If we want to settle our invoice in this test, we do so now.
 	if settle {
-		err = ctx.registry.SettleHodlInvoice(testInvoicePreimage)
+		err = ctx.registry.SettleHodlInvoice(ctxb, testInvoicePreimage)
 		require.NoError(t, err)
 
 		for i := 0; i < numParts; i++ {
@@ -1333,7 +1329,7 @@ func testHeightExpiryWithRegistry(t *testing.T, numParts int, settle bool) {
 
 	// Finally, lookup the invoice and assert that we have the state we
 	// expect.
-	inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
+	inv, err := ctx.registry.LookupInvoice(ctxb, testInvoicePaymentHash)
 	require.NoError(t, err)
 	require.Equal(t, expectedState, inv.State, "expected "+
 		"hold invoice: %v, got: %v", expectedState, inv.State)
@@ -1352,7 +1348,10 @@ func TestMultipleSetHeightExpiry(t *testing.T) {
 	// Add a hold invoice.
 	testInvoice := newInvoice(t, true)
 
-	_, err := ctx.registry.AddInvoice(testInvoice, testInvoicePaymentHash)
+	ctxb := context.Background()
+	_, err := ctx.registry.AddInvoice(
+		ctxb, testInvoice, testInvoicePaymentHash,
+	)
 	require.NoError(t, err)
 
 	mppPayload := &mockPayload{
@@ -1409,7 +1408,7 @@ func TestMultipleSetHeightExpiry(t *testing.T) {
 
 	// Assert that we've reached an accepted state because the invoice has
 	// been paid with a complete set.
-	inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
+	inv, err := ctx.registry.LookupInvoice(ctxb, testInvoicePaymentHash)
 	require.NoError(t, err)
 	require.Equal(t, invpkg.ContractAccepted, inv.State, "expected "+
 		"hold invoice accepted")
@@ -1421,7 +1420,9 @@ func TestMultipleSetHeightExpiry(t *testing.T) {
 	}
 
 	require.Eventuallyf(t, func() bool {
-		inv, err := ctx.registry.LookupInvoice(testInvoicePaymentHash)
+		inv, err := ctx.registry.LookupInvoice(
+			ctxb, testInvoicePaymentHash,
+		)
 		require.NoError(t, err)
 
 		return inv.State == invpkg.ContractCanceled
@@ -1435,14 +1436,15 @@ func TestSettleInvoicePaymentAddrRequired(t *testing.T) {
 	t.Parallel()
 
 	ctx := newTestContext(t, nil)
+	ctxb := context.Background()
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
-	require.Nil(t, err)
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
+	require.NoError(t, err)
 	defer allSubscriptions.Cancel()
 
 	// Subscribe to the not yet existing invoice.
 	subscription, err := ctx.registry.SubscribeSingleInvoice(
-		testInvoicePaymentHash,
+		ctxb, testInvoicePaymentHash,
 	)
 	require.NoError(t, err)
 	defer subscription.Cancel()
@@ -1467,7 +1469,7 @@ func TestSettleInvoicePaymentAddrRequired(t *testing.T) {
 	// Add the invoice, which requires the MPP payload to always be
 	// included due to its set of feature bits.
 	addIdx, err := ctx.registry.AddInvoice(
-		invoice, testInvoicePaymentHash,
+		ctxb, invoice, testInvoicePaymentHash,
 	)
 	require.NoError(t, err)
 	require.Equal(t, int(addIdx), 1)
@@ -1523,14 +1525,15 @@ func TestSettleInvoicePaymentAddrRequiredOptionalGrace(t *testing.T) {
 	t.Parallel()
 
 	ctx := newTestContext(t, nil)
+	ctxb := context.Background()
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
-	require.Nil(t, err)
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
+	require.NoError(t, err)
 	defer allSubscriptions.Cancel()
 
 	// Subscribe to the not yet existing invoice.
 	subscription, err := ctx.registry.SubscribeSingleInvoice(
-		testInvoicePaymentHash,
+		ctxb, testInvoicePaymentHash,
 	)
 	require.NoError(t, err)
 	defer subscription.Cancel()
@@ -1556,7 +1559,7 @@ func TestSettleInvoicePaymentAddrRequiredOptionalGrace(t *testing.T) {
 	// Add the invoice, which does not require the MPP payload to always be
 	// included due to its set of feature bits.
 	addIdx, err := ctx.registry.AddInvoice(
-		invoice, testInvoicePaymentHash,
+		ctxb, invoice, testInvoicePaymentHash,
 	)
 	require.NoError(t, err)
 	require.Equal(t, int(addIdx), 1)
@@ -1725,8 +1728,9 @@ func testSpontaneousAmpPayment(
 	cfg := defaultRegistryConfig()
 	cfg.AcceptAMP = ampEnabled
 	ctx := newTestContext(t, &cfg)
+	ctxb := context.Background()
 
-	allSubscriptions, err := ctx.registry.SubscribeNotifications(0, 0)
+	allSubscriptions, err := ctx.registry.SubscribeNotifications(ctxb, 0, 0)
 	require.Nil(t, err)
 	defer allSubscriptions.Cancel()