eth/downloader: don't require state for ancestor lookups

1 files changed, 6 insertions, 5 deletions

diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 3870f10b9..7ede530a9 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -173,8 +173,8 @@ type LightChain interface {
 type BlockChain interface {
 	LightChain
 
-	// HasBlockAndState verifies block and associated states' presence in the local chain.
-	HasBlockAndState(common.Hash, uint64) bool
+	// HasBlock verifies a block's presence in the local chain.
+	HasBlock(common.Hash, uint64) bool
 
 	// GetBlockByHash retrieves a block from the local chain.
 	GetBlockByHash(common.Hash) *types.Block
@@ -582,7 +582,6 @@ func (d *Downloader) findAncestor(p *peerConnection, height uint64) (uint64, err
 	// Figure out the valid ancestor range to prevent rewrite attacks
 	floor, ceil := int64(-1), d.lightchain.CurrentHeader().Number.Uint64()
 
-	p.log.Debug("Looking for common ancestor", "local", ceil, "remote", height)
 	if d.mode == FullSync {
 		ceil = d.blockchain.CurrentBlock().NumberU64()
 	} else if d.mode == FastSync {
@@ -591,6 +590,8 @@ func (d *Downloader) findAncestor(p *peerConnection, height uint64) (uint64, err
 	if ceil >= MaxForkAncestry {
 		floor = int64(ceil - MaxForkAncestry)
 	}
+	p.log.Debug("Looking for common ancestor", "local", ceil, "remote", height)
+
 	// Request the topmost blocks to short circuit binary ancestor lookup
 	head := ceil
 	if head > height {
@@ -646,7 +647,7 @@ func (d *Downloader) findAncestor(p *peerConnection, height uint64) (uint64, err
 					continue
 				}
 				// Otherwise check if we already know the header or not
-				if (d.mode == FullSync && d.blockchain.HasBlockAndState(headers[i].Hash(), headers[i].Number.Uint64())) || (d.mode != FullSync && d.lightchain.HasHeader(headers[i].Hash(), headers[i].Number.Uint64())) {
+				if (d.mode == FullSync && d.blockchain.HasBlock(headers[i].Hash(), headers[i].Number.Uint64())) || (d.mode != FullSync && d.lightchain.HasHeader(headers[i].Hash(), headers[i].Number.Uint64())) {
 					number, hash = headers[i].Number.Uint64(), headers[i].Hash()
 
 					// If every header is known, even future ones, the peer straight out lied about its head
@@ -711,7 +712,7 @@ func (d *Downloader) findAncestor(p *peerConnection, height uint64) (uint64, err
 				arrived = true
 
 				// Modify the search interval based on the response
-				if (d.mode == FullSync && !d.blockchain.HasBlockAndState(headers[0].Hash(), headers[0].Number.Uint64())) || (d.mode != FullSync && !d.lightchain.HasHeader(headers[0].Hash(), headers[0].Number.Uint64())) {
+				if (d.mode == FullSync && !d.blockchain.HasBlock(headers[0].Hash(), headers[0].Number.Uint64())) || (d.mode != FullSync && !d.lightchain.HasHeader(headers[0].Hash(), headers[0].Number.Uint64())) {
 					end = check
 					break
 				}