lntest: refactor handle close channel update

lntest/node.go

@@ -374,7 +374,7 @@ type HarnessNode struct {
 	openChanWatchers map[wire.OutPoint][]chan struct{}
 
 	closedChans       map[wire.OutPoint]struct{}
-	closeClients map[wire.OutPoint][]chan struct{}
+	closeChanWatchers map[wire.OutPoint][]chan struct{}
 
 	quit chan struct{}
 	wg   sync.WaitGroup
@@ -450,7 +450,7 @@ func newNode(cfg NodeConfig) (*HarnessNode, error) {
 		openChanWatchers:  make(map[wire.OutPoint][]chan struct{}),
 
 		closedChans:       make(map[wire.OutPoint]struct{}),
-		closeClients: make(map[wire.OutPoint][]chan struct{}),
+		closeChanWatchers: make(map[wire.OutPoint][]chan struct{}),
 	}, nil
 }
 
@@ -1439,33 +1439,13 @@ func (hn *HarnessNode) lightningNetworkWatcher(subscribed chan error) {
 		// dispatch any requests.
 		case graphUpdate := <-graphUpdates:
 			hn.handleChannelEdgeUpdates(graphUpdate.ChannelUpdates)
-
+			hn.handleClosedChannelUpdate(graphUpdate.ClosedChans)
-			// For each channel closed, we'll mark that we've
+			// TODO(yy): handle node updates too
-			// detected a channel closure while lnd was pruning the
-			// channel graph.
-			for _, closedChan := range graphUpdate.ClosedChans {
-				txidHash, _ := getChanPointFundingTxid(closedChan.ChanPoint)
-				txid, _ := chainhash.NewHash(txidHash)
-				op := wire.OutPoint{
-					Hash:  *txid,
-					Index: closedChan.ChanPoint.OutputIndex,
-				}
-				hn.closedChans[op] = struct{}{}
-
-				// As the channel has been closed, we'll notify
-				// all register clients.
-				for _, eventChan := range hn.closeClients[op] {
-					close(eventChan)
-				}
-				delete(hn.closeClients, op)
-			}
 
 		// A new watch request, has just arrived. We'll either be able
 		// to dispatch immediately, or need to add the client for
 		// processing later.
 		case watchRequest := <-hn.chanWatchRequests:
-			targetChan := watchRequest.chanPoint
-
 			// TODO(roasbeef): add update type also, checks for
 			// multiple of 2
 			if watchRequest.chanOpen {
@@ -1473,20 +1453,7 @@ func (hn *HarnessNode) lightningNetworkWatcher(subscribed chan error) {
 				continue
 			}
 
-			// If this is a close request, then it can be
+			hn.handleCloseChannelWatchRequest(watchRequest)
-			// immediately dispatched if we've already seen a
-			// channel closure for this channel.
-			if _, ok := hn.closedChans[targetChan]; ok {
-				close(watchRequest.eventChan)
-				continue
-			}
-
-			// Otherwise, we'll add this to the list of close watch
-			// clients for this out point.
-			hn.closeClients[targetChan] = append(
-				hn.closeClients[targetChan],
-				watchRequest.eventChan,
-			)
 
 		case <-hn.quit:
 			return
@@ -1529,24 +1496,18 @@ func (hn *HarnessNode) WaitForNetworkChannelOpen(ctx context.Context,
 // closed once a transaction spending the funding outpoint is seen within a
 // confirmed block.
 func (hn *HarnessNode) WaitForNetworkChannelClose(ctx context.Context,
-	op *lnrpc.ChannelPoint) error {
+	chanPoint *lnrpc.ChannelPoint) error {
 
 	eventChan := make(chan struct{})
 
-	txidHash, err := getChanPointFundingTxid(op)
+	op, err := MakeOutpoint(chanPoint)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to create outpoint for %v "+
-	}
+			"got err: %v", chanPoint, err)
-	txid, err := chainhash.NewHash(txidHash)
-	if err != nil {
-		return err
 	}
 
 	hn.chanWatchRequests <- &chanWatchRequest{
-		chanPoint: wire.OutPoint{
+		chanPoint: op,
-			Hash:  *txid,
-			Index: op.OutputIndex,
-		},
 		eventChan: eventChan,
 		chanOpen:  false,
 	}
@@ -1555,7 +1516,8 @@ func (hn *HarnessNode) WaitForNetworkChannelClose(ctx context.Context,
 	case <-eventChan:
 		return nil
 	case <-ctx.Done():
-		return fmt.Errorf("channel not closed before timeout")
+		return fmt.Errorf("channel:%s not closed before timeout: "+
+			"%s", op, hn)
 	}
 }
 
@@ -1702,3 +1664,52 @@ func (hn *HarnessNode) handleOpenChannelWatchRequest(req *chanWatchRequest) {
 		req.eventChan,
 	)
 }
+
+// handleClosedChannelUpdate takes a series of closed channel updates, extracts
+// the outpoints, saves them to harness node's internal state, and notifies all
+// registered clients.
+func (hn *HarnessNode) handleClosedChannelUpdate(
+	updates []*lnrpc.ClosedChannelUpdate) {
+
+	// For each channel closed, we'll mark that we've detected a channel
+	// closure while lnd was pruning the channel graph.
+	for _, closedChan := range updates {
+		op, err := MakeOutpoint(closedChan.ChanPoint)
+		if err != nil {
+			hn.PrintErr("failed to create outpoint for %v "+
+				"got err: %v", closedChan.ChanPoint, err)
+			return
+		}
+
+		hn.closedChans[op] = struct{}{}
+
+		// As the channel has been closed, we'll notify all register
+		// watchers.
+		for _, eventChan := range hn.closeChanWatchers[op] {
+			close(eventChan)
+		}
+		delete(hn.closeChanWatchers, op)
+	}
+}
+
+// handleCloseChannelWatchRequest processes a watch close channel request by
+// checking whether the given channel point can be found in the node's internal
+// state. If not, the request is added to a watch request list than will be
+// handled by handleCloseChannelWatchRequest.
+func (hn *HarnessNode) handleCloseChannelWatchRequest(req *chanWatchRequest) {
+	targetChan := req.chanPoint
+
+	// If this is a close request, then it can be immediately dispatched if
+	// we've already seen a channel closure for this channel.
+	if _, ok := hn.closedChans[targetChan]; ok {
+		close(req.eventChan)
+		return
+	}
+
+	// Otherwise, we'll add this to the list of close channel watchers for
+	// this out point.
+	hn.closeChanWatchers[targetChan] = append(
+		hn.closeChanWatchers[targetChan],
+		req.eventChan,
+	)
+}