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Optimize JSON-RPC getblockhash

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- If the height is in the first half, start at the genesis block and go up, rather than at the top
- Cache the last lookup and use it as a reference point if it's close to the next request, to make linear lookups always fast
This commit is contained in:
Luke Dashjr
2012-07-19 20:06:20 +00:00
parent 4060d64fc9
commit 1be064190e
3 changed files with 21 additions and 4 deletions
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5
src/bitcoinrpc.cpp
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@@ -2023,10 +2023,7 @@ Value getblockhash(const Array& params, bool fHelp)
if (nHeight < 0 || nHeight > nBestHeight)
throw runtime_error("Block number out of range.");
CBlock block;
CBlockIndex* pblockindex = mapBlockIndex[hashBestChain];
while (pblockindex->nHeight > nHeight)
pblockindex = pblockindex->pprev;
CBlockIndex* pblockindex = FindBlockByHeight(nHeight);
return pblockindex->phashBlock->GetHex();
}