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Merge pull request #1612 from luke-jr/opti_getblkhash

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Optimize JSON-RPC getblockhash
This commit is contained in:
Gregory Maxwell 2012-08-01 11:49:26 -07:00
commit 8ce7915aad
3 changed files with 21 additions and 4 deletions
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5
src/bitcoinrpc.cpp
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@ -2047,10 +2047,7 @@ 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();
}

19
src/main.cpp
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@ -811,6 +811,24 @@ bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock)
// CBlock and CBlockIndex
//
static CBlockIndex* pblockindexFBBHLast;
CBlockIndex* FindBlockByHeight(int nHeight)
{
CBlockIndex *pblockindex;
if (nHeight < nBestHeight / 2)
pblockindex = pindexGenesisBlock;
else
pblockindex = pindexBest;
if (pblockindexFBBHLast && abs(nHeight - pblockindex->nHeight) > abs(nHeight - pblockindexFBBHLast->nHeight))
pblockindex = pblockindexFBBHLast;
while (pblockindex->nHeight > nHeight)
pblockindex = pblockindex->pprev;
while (pblockindex->nHeight < nHeight)
pblockindex = pblockindex->pnext;
pblockindexFBBHLast = pblockindex;
return pblockindex;
}
bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
{
if (!fReadTransactions)
@ -1634,6 +1652,7 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
// New best block
hashBestChain = hash;
pindexBest = pindexNew;
pblockindexFBBHLast = NULL;
nBestHeight = pindexBest->nHeight;
bnBestChainWork = pindexNew->bnChainWork;
nTimeBestReceived = GetTime();

1
src/main.h
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@ -88,6 +88,7 @@ FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszM
FILE* AppendBlockFile(unsigned int& nFileRet);
bool LoadBlockIndex(bool fAllowNew=true);
void PrintBlockTree();
CBlockIndex* FindBlockByHeight(int nHeight);
bool ProcessMessages(CNode* pfrom);
bool SendMessages(CNode* pto, bool fSendTrickle);
bool LoadExternalBlockFile(FILE* fileIn);