core, eth: receipt chain reconstruction

1 files changed, 23 insertions, 1 deletions

diff --git a/core/chain_util.go b/core/chain_util.go
index 42b6a5be2..907e6668c 100644
--- a/core/chain_util.go
+++ b/core/chain_util.go
@@ -34,6 +34,7 @@ import (
 var (
 	headHeaderKey = []byte("LastHeader")
 	headBlockKey  = []byte("LastBlock")
+	headFastKey   = []byte("LastFast")
 
 	blockPrefix    = []byte("block-")
 	blockNumPrefix = []byte("block-num-")
@@ -129,7 +130,7 @@ func GetCanonicalHash(db ethdb.Database, number uint64) common.Hash {
 // header. The difference between this and GetHeadBlockHash is that whereas the
 // last block hash is only updated upon a full block import, the last header
 // hash is updated already at header import, allowing head tracking for the
-// fast synchronization mechanism.
+// light synchronization mechanism.
 func GetHeadHeaderHash(db ethdb.Database) common.Hash {
 	data, _ := db.Get(headHeaderKey)
 	if len(data) == 0 {
@@ -147,6 +148,18 @@ func GetHeadBlockHash(db ethdb.Database) common.Hash {
 	return common.BytesToHash(data)
 }
 
+// GetHeadFastBlockHash retrieves the hash of the current canonical head block during
+// fast synchronization. The difference between this and GetHeadBlockHash is that
+// whereas the last block hash is only updated upon a full block import, the last
+// fast hash is updated when importing pre-processed blocks.
+func GetHeadFastBlockHash(db ethdb.Database) common.Hash {
+	data, _ := db.Get(headFastKey)
+	if len(data) == 0 {
+		return common.Hash{}
+	}
+	return common.BytesToHash(data)
+}
+
 // GetHeaderRLP retrieves a block header in its raw RLP database encoding, or nil
 // if the header's not found.
 func GetHeaderRLP(db ethdb.Database, hash common.Hash) rlp.RawValue {
@@ -249,6 +262,15 @@ func WriteHeadBlockHash(db ethdb.Database, hash common.Hash) error {
 	return nil
 }
 
+// WriteHeadFastBlockHash stores the fast head block's hash.
+func WriteHeadFastBlockHash(db ethdb.Database, hash common.Hash) error {
+	if err := db.Put(headFastKey, hash.Bytes()); err != nil {
+		glog.Fatalf("failed to store last fast block's hash into database: %v", err)
+		return err
+	}
+	return nil
+}
+
 // WriteHeader serializes a block header into the database.
 func WriteHeader(db ethdb.Database, header *types.Header) error {
 	data, err := rlp.EncodeToBytes(header)