multi: add new method ChainArbitrator.RedispatchBlockbeat

This commit adds a new method to enable us resending the blockbeat in
`ChainArbitrator`, which is needed for the channel restore as the chain
watcher and channel arbitrator are added after the start of the chain
arbitrator.

chanrestore.go

@@ -8,6 +8,7 @@ import (
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
+	"github.com/btcsuite/btcd/wire"
 	"github.com/lightningnetwork/lnd/chanbackup"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/contractcourt"
@@ -286,6 +287,9 @@ func (c *chanDBRestorer) RestoreChansFromSingles(backups ...chanbackup.Single) e
 
 	ltndLog.Infof("Informing chain watchers of new restored channels")
 
+	// Create a slice of channel points.
+	chanPoints := make([]wire.OutPoint, 0, len(channelShells))
+
 	// Finally, we'll need to inform the chain arbitrator of these new
 	// channels so we'll properly watch for their ultimate closure on chain
 	// and sweep them via the DLP.
@@ -294,8 +298,15 @@ func (c *chanDBRestorer) RestoreChansFromSingles(backups ...chanbackup.Single) e
 		if err != nil {
 			return err
 		}
+
+		chanPoints = append(
+			chanPoints, restoredChannel.Chan.FundingOutpoint,
+		)
 	}
 
+	// With all the channels restored, we'll now re-send the blockbeat.
+	c.chainArb.RedispatchBlockbeat(chanPoints)
+
 	return nil
 }
 
@@ -314,7 +325,7 @@ func (s *server) ConnectPeer(nodePub *btcec.PublicKey, addrs []net.Addr) error {
 	// to ensure the new connection is created after this new link/channel
 	// is known.
 	if err := s.DisconnectPeer(nodePub); err != nil {
-		ltndLog.Infof("Peer(%v) is already connected, proceeding "+
+		ltndLog.Infof("Peer(%x) is already connected, proceeding "+
 			"with chan restore", nodePub.SerializeCompressed())
 	}