channeldb: refresh channel state within RefreshShortChanID

Refresh channel memory state whenever the short channel id is refreshed.
This is to make the in-memory channel consistent with the disk data.

Fixes #3765.

channeldb/channel.go

@@ -594,13 +594,15 @@ func (c *OpenChannel) hasChanStatus(status ChannelStatus) bool {
 	return c.chanStatus&status == status
 }
 
-// RefreshShortChanID updates the in-memory short channel ID using the latest
+// RefreshShortChanID updates the in-memory channel state using the latest
 // value observed on disk.
+// TODO: the name of this function should be changed to reflect the fact that
+// it is not only refreshing the short channel id but all the channel state.
+// maybe Refresh/Reload?
 func (c *OpenChannel) RefreshShortChanID() error {
 	c.Lock()
 	defer c.Unlock()
 
-	var sid lnwire.ShortChannelID
 	err := c.Db.View(func(tx *bbolt.Tx) error {
 		chanBucket, err := fetchChanBucket(
 			tx, c.IdentityPub, &c.FundingOutpoint, c.ChainHash,
@@ -609,22 +611,17 @@ func (c *OpenChannel) RefreshShortChanID() error {
 			return err
 		}
 
-		channel, err := fetchOpenChannel(chanBucket, &c.FundingOutpoint)
-		if err != nil {
-			return err
+		// populating the in-memory channel with the info fetched from disk.
+		if err := fetchChanInfo(chanBucket, c); err != nil {
+			return fmt.Errorf("unable to fetch chan info: %v", err)
 		}
 
-		sid = channel.ShortChannelID
-
 		return nil
 	})
 	if err != nil {
 		return err
 	}
 
-	c.ShortChannelID = sid
-	c.Packager = NewChannelPackager(sid)
-
 	return nil
 }
 

channeldb/channel_test.go

@@ -939,8 +939,8 @@ func TestFetchWaitingCloseChannels(t *testing.T) {
 }
 
 // TestRefreshShortChanID asserts that RefreshShortChanID updates the in-memory
-// short channel ID of another OpenChannel to reflect a preceding call to
-// MarkOpen on a different OpenChannel.
+// state of another OpenChannel to reflect a preceding call to MarkOpen on a
+// different OpenChannel.
 func TestRefreshShortChanID(t *testing.T) {
 	t.Parallel()
 
@@ -1038,4 +1038,10 @@ func TestRefreshShortChanID(t *testing.T) {
 			"got %v", chanOpenLoc,
 			pendingChannel.Packager.(*ChannelPackager).source)
 	}
+
+	// Check to ensure that this channel is no longer pending and this field
+	// is up to date.
+	if pendingChannel.IsPending {
+		t.Fatalf("channel pending state wasn't updated: want false got true")
+	}
 }

lntest/itest/lnd_test.go

@@ -1219,6 +1219,90 @@ func testUnconfirmedChannelFunding(net *lntest.NetworkHarness, t *harnessTest) {
 	closeChannelAndAssert(ctxt, t, net, carol, chanPoint, false)
 }
 
+// testPaymentFollowingChannelOpen tests that the channel transition from
+// 'pending' to 'open' state does not cause any inconsistencies within other
+// subsystems trying to udpate the channel state in the db. We follow
+// this transition with a payment that updates the commitment state and
+// verify that the pending state is up to date.
+func testPaymentFollowingChannelOpen(net *lntest.NetworkHarness, t *harnessTest) {
+	ctxb := context.Background()
+
+	// We first establish a channel between Alice and Bob.
+	const paymentAmt = btcutil.Amount(100)
+	ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout)
+	channelCapacity := btcutil.Amount(paymentAmt * 1000)
+	pendingUpdate, err := net.OpenPendingChannel(ctxt, net.Alice, net.Bob,
+		channelCapacity, 0)
+	if err != nil {
+		t.Fatalf("unable to open channel: %v", err)
+	}
+
+	// At this point, the channel's funding transaction will have
+	// been broadcast, but not confirmed. Alice and Bob's nodes
+	// should reflect this when queried via RPC.
+	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
+	assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 1)
+
+	// We are restarting Bob's node to let the link be created for the pending
+	// channel.
+	if err := net.RestartNode(net.Bob, nil); err != nil {
+		t.Fatalf("Bob restart failed: %v", err)
+	}
+
+	// We ensure that Bob reconnets to Alice.
+	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
+	if err := net.EnsureConnected(ctxt, net.Bob, net.Alice); err != nil {
+		t.Fatalf("peers unable to reconnect after restart: %v", err)
+	}
+
+	// We mine one block for the channel to be confirmed.
+	_ = mineBlocks(t, net, 6, 1)[0]
+
+	// We verify that the chanel is open from both nodes point of view.
+	time.Sleep(time.Millisecond * 300)
+	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
+	assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 0)
+
+	// With the channel open, we'll create invoices for Bob that Alice
+	// will pay to in order to advance the state of the channel.
+	bobPayReqs, _, _, err := createPayReqs(
+		net.Bob, paymentAmt, 1,
+	)
+	if err != nil {
+		t.Fatalf("unable to create pay reqs: %v", err)
+	}
+
+	// Send payment to Bob so there a chanel update to disk will be executed.
+	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
+	_, err = net.Alice.SendPaymentSync(ctxt,
+		&lnrpc.SendRequest{PaymentRequest: bobPayReqs[0]})
+	if err != nil {
+		t.Fatalf("unable to create payment stream for alice: %v", err)
+	}
+
+	// At this point we want to make sure the channel is opened and not pending.
+	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
+	res, err := net.Bob.ListChannels(ctxt, &lnrpc.ListChannelsRequest{})
+	if err != nil {
+		t.Fatalf("unable to list bob channels: %v", err)
+	}
+	if len(res.Channels) == 0 {
+		t.Fatalf("bob list of channels is empty")
+	}
+
+	// Finally, immediately close the channel. This function will also
+	// block until the channel is closed and will additionally assert the
+	// relevant channel closing post conditions.
+	chanPoint := &lnrpc.ChannelPoint{
+		FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{
+			FundingTxidBytes: pendingUpdate.Txid,
+		},
+		OutputIndex: pendingUpdate.OutputIndex,
+	}
+	ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout)
+	closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false)
+}
+
 // txStr returns the string representation of the channel's funding transaction.
 func txStr(chanPoint *lnrpc.ChannelPoint) string {
 	fundingTxID, err := lnd.GetChanPointFundingTxid(chanPoint)
@@ -14955,6 +15039,10 @@ var testsCases = []*testCase{
 		name: "macaroon authentication",
 		test: testMacaroonAuthentication,
 	},
+	{
+		name: "immediate payment after channel opened",
+		test: testPaymentFollowingChannelOpen,
+	},
 }
 
 // TestLightningNetworkDaemon performs a series of integration tests amongst a