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-rw-r--r--ethchain/block_chain.go20
1 files changed, 20 insertions, 0 deletions
diff --git a/ethchain/block_chain.go b/ethchain/block_chain.go
index 611735707..3445bbb87 100644
--- a/ethchain/block_chain.go
+++ b/ethchain/block_chain.go
@@ -208,6 +208,26 @@ func (bc *BlockChain) GenesisBlock() *Block {
return bc.genesisBlock
}
+func (self *BlockChain) GetChainHashesFromHash(hash []byte, max uint64) (chain [][]byte) {
+ block := self.GetBlock(hash)
+ if block == nil {
+ return
+ }
+
+ // XXX Could be optimised by using a different database which only holds hashes (i.e., linked list)
+ for i := uint64(0); i < max; i++ {
+ chain = append(chain, block.Hash())
+
+ if block.Number.Cmp(ethutil.Big0) <= 0 {
+ break
+ }
+
+ block = self.GetBlock(block.PrevHash)
+ }
+
+ return
+}
+
// Get chain return blocks from hash up to max in RLP format
func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
var chain []interface{}