Merge pull request #2097 from karalabe/block-state-checks

core, eth/downloader: ensure state presence in ancestor lookup

2 files changed, 13 insertions, 1 deletions

diff --git a/core/blockchain.go b/core/blockchain.go
index 9d526e352..95ed06d8d 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -587,6 +587,19 @@ func (bc *BlockChain) HasBlock(hash common.Hash) bool {
 	return bc.GetBlock(hash) != nil
 }
 
+// HasBlockAndState checks if a block and associated state trie is fully present
+// in the database or not, caching it if present.
+func (bc *BlockChain) HasBlockAndState(hash common.Hash) bool {
+	// Check first that the block itself is known
+	block := bc.GetBlock(hash)
+	if block == nil {
+		return false
+	}
+	// Ensure the associated state is also present
+	_, err := state.New(block.Root(), bc.chainDb)
+	return err == nil
+}
+
 // GetBlock retrieves a block from the database by hash, caching it if found.
 func (self *BlockChain) GetBlock(hash common.Hash) *types.Block {
 	// Short circuit if the block's already in the cache, retrieve otherwise
diff --git a/core/state/statedb.go b/core/state/statedb.go
index ab93870bf..413321057 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -57,7 +57,6 @@ type StateDB struct {
 func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
 	tr, err := trie.NewSecure(root, db)
 	if err != nil {
-		glog.Errorf("can't create state trie with root %x: %v", root[:], err)
 		return nil, err
 	}
 	return &StateDB{