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Add optional transaction index to databases

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By specifying -txindex when initializing the database, a txid-to-diskpos
index is maintained in the blktree database. This database is used to
help answering getrawtransaction() RPC queries, when enabled.

Changing the -txindex value requires a -reindex; the client will abort
at startup if the database and the specified -txindex mismatch.
This commit is contained in:
Pieter Wuille
2013-01-11 01:47:57 +01:00
committed by Pieter Wuille
parent 2c7847349d
commit 2d1fa42e85
5 changed files with 94 additions and 7 deletions
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44
src/main.cpp
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@@ -45,6 +45,7 @@ int nScriptCheckThreads = 0;
bool fImporting = false;
bool fReindex = false;
bool fBenchmark = false;
bool fTxIndex = false;
unsigned int nCoinCacheSize = 5000;
CMedianFilter<int> cPeerBlockCounts(8, 0); // Amount of blocks that other nodes claim to have
@@ -949,6 +950,25 @@ bool GetTransaction(const uint256 &hash, CTransaction &txOut, uint256 &hashBlock
}
}
if (fTxIndex) {
CDiskTxPos postx;
if (pblocktree->ReadTxIndex(hash, postx)) {
CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
CBlockHeader header;
try {
file >> header;
fseek(file, postx.nTxOffset, SEEK_CUR);
file >> txOut;
} catch (std::exception &e) {
return error("%s() : deserialize or I/O error", __PRETTY_FUNCTION__);
}
hashBlock = header.GetHash();
if (txOut.GetHash() != hash)
return error("%s() : txid mismatch", __PRETTY_FUNCTION__);
return true;
}
}
if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it
int nHeight = -1;
{
@@ -1632,6 +1652,9 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
int64 nFees = 0;
int nInputs = 0;
unsigned int nSigOps = 0;
CDiskTxPos pos(pindex->GetBlockPos(), GetSizeOfCompactSize(vtx.size()));
std::vector<std::pair<uint256, CDiskTxPos> > vPos;
vPos.reserve(vtx.size());
for (unsigned int i=0; i<vtx.size(); i++)
{
@@ -1671,6 +1694,8 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
if (!tx.IsCoinBase())
blockundo.vtxundo.push_back(txundo);
vPos.push_back(std::make_pair(GetTxHash(i), pos));
pos.nTxOffset += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
}
int64 nTime = GetTimeMicros() - nStart;
if (fBenchmark)
@@ -1710,6 +1735,9 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
return error("ConnectBlock() : WriteBlockIndex failed");
}
if (fTxIndex)
pblocktree->WriteTxIndex(vPos);
// add this block to the view's block chain
if (!view.SetBestBlock(pindex))
return false;
@@ -2554,6 +2582,10 @@ bool static LoadBlockIndexDB()
pblocktree->ReadReindexing(fReindexing);
fReindex |= fReindexing;
// Check whether we have a transaction index
pblocktree->ReadFlag("txindex", fTxIndex);
printf("LoadBlockIndex(): transaction index %s\n", fTxIndex ? "enabled" : "disabled");
// Load hashBestChain pointer to end of best chain
pindexBest = pcoinsTip->GetBestBlock();
if (pindexBest == NULL)
@@ -2658,13 +2690,10 @@ bool LoadBlockIndex()
hashGenesisBlock = uint256("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943");
}
if (fReindex)
return true;
//
// Load block index from databases
//
if (!LoadBlockIndexDB())
if (!fReindex && !LoadBlockIndexDB())
return false;
//
@@ -2672,6 +2701,13 @@ bool LoadBlockIndex()
//
if (mapBlockIndex.empty())
{
fTxIndex = GetBoolArg("-txindex", false);
pblocktree->WriteFlag("txindex", fTxIndex);
printf("Initializing databases...\n");
if (fReindex)
return true;
// Genesis Block:
// CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
// CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)