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Use replaced transactions in compact block reconstruction

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This commit is contained in:
Matt Corallo
2016-12-04 20:44:37 -08:00
parent 1531652e02
commit 93380c5247
4 changed files with 41 additions and 8 deletions
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32
src/blockencodings.cpp
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@@ -47,7 +47,7 @@ uint64_t CBlockHeaderAndShortTxIDs::GetShortID(const uint256& txhash) const {
ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& cmpctblock) {
ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, std::vector<std::pair<uint256, CTransactionRef>>& extra_txn) {
if (cmpctblock.header.IsNull() || (cmpctblock.shorttxids.empty() && cmpctblock.prefilledtxn.empty()))
return READ_STATUS_INVALID;
if (cmpctblock.shorttxids.size() + cmpctblock.prefilledtxn.size() > MAX_BLOCK_BASE_SIZE / MIN_TRANSACTION_BASE_SIZE)
@@ -104,6 +104,7 @@ ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& c
return READ_STATUS_FAILED; // Short ID collision
std::vector<bool> have_txn(txn_available.size());
{
LOCK(pool->cs);
const std::vector<std::pair<uint256, CTxMemPool::txiter> >& vTxHashes = pool->vTxHashes;
for (size_t i = 0; i < vTxHashes.size(); i++) {
@@ -130,6 +131,35 @@ ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& c
if (mempool_count == shorttxids.size())
break;
}
}
for (size_t i = 0; i < extra_txn.size(); i++) {
uint64_t shortid = cmpctblock.GetShortID(extra_txn[i].first);
std::unordered_map<uint64_t, uint16_t>::iterator idit = shorttxids.find(shortid);
if (idit != shorttxids.end()) {
if (!have_txn[idit->second]) {
txn_available[idit->second] = extra_txn[i].second;
have_txn[idit->second] = true;
mempool_count++;
} else {
// If we find two mempool txn that match the short id, just request it.
// This should be rare enough that the extra bandwidth doesn't matter,
// but eating a round-trip due to FillBlock failure would be annoying
// Note that we dont want duplication between extra_txn and mempool to
// trigger this case, so we compare witness hashes first
if (txn_available[idit->second] &&
txn_available[idit->second]->GetWitnessHash() != extra_txn[i].second->GetWitnessHash()) {
txn_available[idit->second].reset();
mempool_count--;
}
}
}
// Though ideally we'd continue scanning for the two-txn-match-shortid case,
// the performance win of an early exit here is too good to pass up and worth
// the extra risk.
if (mempool_count == shorttxids.size())
break;
}
LogPrint("cmpctblock", "Initialized PartiallyDownloadedBlock for block %s using a cmpctblock of size %lu\n", cmpctblock.header.GetHash().ToString(), GetSerializeSize(cmpctblock, SER_NETWORK, PROTOCOL_VERSION));