peer+rpcserver: use new conf scaling for notifications

peer/brontide.go

@@ -4465,14 +4465,19 @@ func (p *Brontide) finalizeChanClosure(chanCloser *chancloser.ChanCloser) {
 	localOut := chanCloser.LocalCloseOutput()
 	remoteOut := chanCloser.RemoteCloseOutput()
 	auxOut := chanCloser.AuxOutputs()
-	go WaitForChanToClose(
-		chanCloser.NegotiationHeight(), notifier, errChan,
-		&chanPoint, &closingTxid, closingTx.TxOut[0].PkScript, func() {
-			// Respond to the local subsystem which requested the
-			// channel closure.
-			if closeReq != nil {
-				closeReq.Updates <- &ChannelCloseUpdate{
-					ClosingTxid:       closingTxid[:],
+    // Determine the number of confirmations to wait before
+    // signaling a successful cooperative close, scaled by
+    // channel capacity (see CloseConfsForCapacity).
+    numConfs := lnwallet.CloseConfsForCapacity(chanCloser.Channel().Capacity)
+
+    go WaitForChanToClose(
+        chanCloser.NegotiationHeight(), notifier, errChan,
+        &chanPoint, &closingTxid, closingTx.TxOut[0].PkScript, numConfs, func() {
+            // Respond to the local subsystem which requested the
+            // channel closure.
+            if closeReq != nil {
+                closeReq.Updates <- &ChannelCloseUpdate{
+                    ClosingTxid:       closingTxid[:],
 					Success:           true,
 					LocalCloseOutput:  localOut,
 					RemoteCloseOutput: remoteOut,
@@ -4489,16 +4494,15 @@ func (p *Brontide) finalizeChanClosure(chanCloser *chancloser.ChanCloser) {
 // finally the callback will be executed. If any error is encountered within
 // the function, then it will be sent over the errChan.
 func WaitForChanToClose(bestHeight uint32, notifier chainntnfs.ChainNotifier,
-	errChan chan error, chanPoint *wire.OutPoint,
-	closingTxID *chainhash.Hash, closeScript []byte, cb func()) {
+    errChan chan error, chanPoint *wire.OutPoint,
+    closingTxID *chainhash.Hash, closeScript []byte, numConfs uint32, cb func()) {
 
 	peerLog.Infof("Waiting for confirmation of close of ChannelPoint(%v) "+
 		"with txid: %v", chanPoint, closingTxID)
 
-	// TODO(roasbeef): add param for num needed confs
-	confNtfn, err := notifier.RegisterConfirmationsNtfn(
-		closingTxID, closeScript, 1, bestHeight,
-	)
+    confNtfn, err := notifier.RegisterConfirmationsNtfn(
+        closingTxID, closeScript, numConfs, bestHeight,
+    )
 	if err != nil {
 		if errChan != nil {
 			errChan <- err

rpcserver.go

@@ -2845,9 +2845,16 @@ func (r *rpcServer) CloseChannel(in *lnrpc.CloseChannelRequest,
 
 		errChan = make(chan error, 1)
 		notifier := r.server.cc.ChainNotifier
+
+		// For force closes, we notify the RPC client immediately after
+		// 1 confirmation. The actual security-critical confirmation
+		// waiting is handled by the channel arbitrator.
+		numConfs := uint32(1)
+
 		go peer.WaitForChanToClose(
 			uint32(bestHeight), notifier, errChan, chanPoint,
-			&closingTxid, closingTx.TxOut[0].PkScript, func() {
+			&closingTxid, closingTx.TxOut[0].PkScript, numConfs,
+			func() {
 				// Respond to the local subsystem which
 				// requested the channel closure.
 				updateChan <- &peer.ChannelCloseUpdate{