@Nullable
Sha256Hash getHashByHeight(int height) {
Preconditions.checkArgument(height >= 0, "Height mustn't be negative");
final AbstractBlockChain blockChain = linearExtension.getBlockChain();
StoredBlock currentBlock = blockChain.getChainHead();
if (currentBlock == null || currentBlock.getHeight() < height) {
return null;
}
final BlockStore blockStore = blockChain.getBlockStore();
try {
while (currentBlock.getHeight() > height) {
currentBlock = currentBlock.getPrev(blockStore);
if (currentBlock == null) return null;
}
return currentBlock.getHeader().getHash();
} catch (BlockStoreException ex) {
log.error("Error while descending the chain", ex);
return null;
}
}
