Merge pull request #9643 from yyforyongyu/fix-startup

lnd: make sure startup flow is not aborted

Author: guggero

docs/release-notes/release-notes-0.19.0.md

@@ -107,6 +107,10 @@
 keysend payment would not fail properly and only resolve after restart. Now
 keysend payment validation is stricter.
 
+* [Make sure](https://github.com/lightningnetwork/lnd/pull/9643) the startup
+  process of the node won't be interrupted if a non-fatal error is returned from
+  the subsystems.
+
 # New Features
 
 * Add support for [archiving channel backup](https://github.com/lightningnetwork/lnd/pull/9232)

server.go

@@ -2195,7 +2195,7 @@ func (c cleaner) add(cleanup func() error) cleaner {
 func (c cleaner) run() {
 	for i := len(c) - 1; i >= 0; i-- {
 		if err := c[i](); err != nil {
-			srvrLog.Infof("Cleanup failed: %v", err)
+			srvrLog.Errorf("Cleanup failed: %v", err)
 		}
 	}
 }
@@ -2498,7 +2498,11 @@ func (s *server) Start() error {
 		// brontide.NewListener() is called in newServer. This means
 		// that we are actually listening and partially accepting
 		// inbound connections even before the connMgr starts.
+		//
+		// TODO(yy): move the log into the connMgr's `Start` method.
+		srvrLog.Info("connMgr starting...")
 		s.connMgr.Start()
+		srvrLog.Debug("connMgr started")
 
 		// If peers are specified as a config option, we'll add those
 		// peers first.
@@ -2540,6 +2544,9 @@ func (s *server) Start() error {
 		// Subscribe to NodeAnnouncements that advertise new addresses
 		// our persistent peers.
 		if err := s.updatePersistentPeerAddrs(); err != nil {
+			srvrLog.Errorf("Failed to update persistent peer "+
+				"addr: %v", err)
+
 			startErr = err
 			return
 		}
@@ -2551,12 +2558,15 @@ func (s *server) Start() error {
 		// to ensure we don't reconnect to any nodes we no longer have
 		// open channels with.
 		if err := s.chanStateDB.PruneLinkNodes(); err != nil {
+			srvrLog.Errorf("Failed to prune link nodes: %v", err)
+
 			startErr = err
 			return
 		}
+
 		if err := s.establishPersistentConnections(); err != nil {
-			startErr = err
-			return
+			srvrLog.Errorf("Failed to establish persistent "+
+				"connections: %v", err)
 		}
 
 		// setSeedList is a helper function that turns multiple DNS seed
@@ -3535,8 +3545,9 @@ func (s *server) establishPersistentConnections() error {
 	// the reconnection port to the default peer port.
 	linkNodes, err := s.chanStateDB.LinkNodeDB().FetchAllLinkNodes()
 	if err != nil && err != channeldb.ErrLinkNodesNotFound {
-		return err
+		return fmt.Errorf("failed to fetch all link nodes: %w", err)
 	}
+
 	for _, node := range linkNodes {
 		pubStr := string(node.IdentityPub.SerializeCompressed())
 		nodeAddrs := &nodeAddresses{
@@ -3551,7 +3562,7 @@ func (s *server) establishPersistentConnections() error {
 	// that have been added via NodeAnnouncement messages.
 	sourceNode, err := s.graphDB.SourceNode()
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to fetch source node: %w", err)
 	}
 
 	// TODO(roasbeef): instead iterate over link nodes and query graph for
@@ -3637,8 +3648,15 @@ func (s *server) establishPersistentConnections() error {
 		nodeAddrsMap[pubStr] = n
 		return nil
 	})
-	if err != nil && !errors.Is(err, graphdb.ErrGraphNoEdgesFound) {
-		return err
+	if err != nil {
+		srvrLog.Errorf("Failed to iterate channels for node %x",
+			sourceNode.PubKeyBytes)
+
+		if !errors.Is(err, graphdb.ErrGraphNoEdgesFound) &&
+			!errors.Is(err, graphdb.ErrEdgeNotFound) {
+
+			return err
+		}
 	}
 
 	srvrLog.Debugf("Establishing %v persistent connections on start",