From fbde9a97c8f1f82078f799c3c71ca2e75a1c7ebd Mon Sep 17 00:00:00 2001
From: Alex <alex@akselrod.org>
Date: Wed, 12 Jul 2017 19:33:45 -0600
Subject: [PATCH] wallet: eliminate some unneeded database transaction
 opens/commits

---
 wallet/chainntfns.go | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/wallet/chainntfns.go b/wallet/chainntfns.go
index 58b61b3..419a2b3 100644
--- a/wallet/chainntfns.go
+++ b/wallet/chainntfns.go
@@ -56,16 +56,21 @@ func (w *Wallet) handleChainNotifications() {
 			notificationName = "recvtx/redeemingtx"
 		case chain.FilteredBlockConnected:
 			// Atomically update for the whole block.
-			err = walletdb.Update(w.db, func(tx walletdb.ReadWriteTx) error {
-				var err error
-				for _, rec := range n.RelevantTxs {
-					err = w.addRelevantTx(tx, rec, n.Block)
-					if err != nil {
-						return err
+			if len(n.RelevantTxs) > 0 {
+				err = walletdb.Update(w.db, func(
+					tx walletdb.ReadWriteTx) error {
+					var err error
+					for _, rec := range n.RelevantTxs {
+						err = w.addRelevantTx(tx, rec,
+							n.Block)
+						if err != nil {
+							return err
+						}
 					}
-				}
-				return nil
-			})
+					return nil
+				})
+			}
+			notificationName = "filteredblockconnected"
 
 		// The following are handled by the wallet's rescan
 		// goroutines, so just pass them there.