From 941920f2aa651abc6bd72deda09f62d77aeaa2bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Wed, 19 Aug 2015 15:14:26 +0300
Subject: eth: fix an issue with pulling and inserting blocks twice

---
 eth/handler.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'eth')

diff --git a/eth/handler.go b/eth/handler.go
index 2bd369901..5d233dd96 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -413,10 +413,12 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 
 		pm.fetcher.Enqueue(p.id, request.Block)
 
-		// TODO: Schedule a sync to cover potential gaps (this needs proto update)
+		// Update the peers total difficulty if needed, schedule a download if gapped
 		if request.TD.Cmp(p.Td()) > 0 {
 			p.SetTd(request.TD)
-			go pm.synchronise(p)
+			if request.TD.Cmp(new(big.Int).Add(pm.chainman.Td(), request.Block.Difficulty())) > 0 {
+				go pm.synchronise(p)
+			}
 		}
 
 	case TxMsg:
-- 
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