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Make FillBlock consume txn_available to avoid shared_ptr copies

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sipa committed Nov 11, 2016
1 parent 62607d7 commit 6713f0f142d97b4608c95a3ea03b4b670fceab2b
Showing with 40 additions and 21 deletions.
  1. +10 −4 src/blockencodings.cpp
  2. +1 −1 src/blockencodings.h
  3. +29 −16 src/test/blockencodings_tests.cpp
@@ -142,8 +142,9 @@ bool PartiallyDownloadedBlock::IsTxAvailable(size_t index) const {
return txn_available[index] ? true : false;
}

ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing) const {
ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing) {
assert(!header.IsNull());
uint256 hash = header.GetHash();
block = header;
block.vtx.resize(txn_available.size());

@@ -154,8 +155,13 @@ ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector<
return READ_STATUS_INVALID;
block.vtx[i] = vtx_missing[tx_missing_offset++];
} else
block.vtx[i] = txn_available[i];
block.vtx[i] = std::move(txn_available[i]);
}

// Make sure we can't call FillBlock again.
header.SetNull();
txn_available.clear();

if (vtx_missing.size() != tx_missing_offset)
return READ_STATUS_INVALID;

@@ -170,10 +176,10 @@ ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector<
return READ_STATUS_CHECKBLOCK_FAILED;
}

LogPrint("cmpctblock", "Successfully reconstructed block %s with %lu txn prefilled, %lu txn from mempool and %lu txn requested\n", header.GetHash().ToString(), prefilled_count, mempool_count, vtx_missing.size());
LogPrint("cmpctblock", "Successfully reconstructed block %s with %lu txn prefilled, %lu txn from mempool and %lu txn requested\n", hash.ToString(), prefilled_count, mempool_count, vtx_missing.size());
if (vtx_missing.size() < 5) {
for (const auto& tx : vtx_missing)
LogPrint("cmpctblock", "Reconstructed block %s required tx %s\n", header.GetHash().ToString(), tx->GetHash().ToString());
LogPrint("cmpctblock", "Reconstructed block %s required tx %s\n", hash.ToString(), tx->GetHash().ToString());
}

return READ_STATUS_OK;
@@ -202,7 +202,7 @@ class PartiallyDownloadedBlock {

ReadStatus InitData(const CBlockHeaderAndShortTxIDs& cmpctblock);
bool IsTxAvailable(size_t index) const;
ReadStatus FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing) const;
ReadStatus FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing);
};

#endif
@@ -85,17 +85,23 @@ BOOST_AUTO_TEST_CASE(SimpleRoundTripTest)
BOOST_CHECK_EQUAL(pool.size(), poolSize - 1);

CBlock block2;
std::vector<CTransactionRef> vtx_missing;
BOOST_CHECK(partialBlock.FillBlock(block2, vtx_missing) == READ_STATUS_INVALID); // No transactions
{
PartiallyDownloadedBlock tmp = partialBlock;
BOOST_CHECK(partialBlock.FillBlock(block2, {}) == READ_STATUS_INVALID); // No transactions
partialBlock = tmp;
}

vtx_missing.push_back(block.vtx[2]); // Wrong transaction
partialBlock.FillBlock(block2, vtx_missing); // Current implementation doesn't check txn here, but don't require that
// Wrong transaction
{
PartiallyDownloadedBlock tmp = partialBlock;
partialBlock.FillBlock(block2, {block.vtx[2]}); // Current implementation doesn't check txn here, but don't require that
partialBlock = tmp;
}
bool mutated;
BOOST_CHECK(block.hashMerkleRoot != BlockMerkleRoot(block2, &mutated));

vtx_missing[0] = block.vtx[1];
CBlock block3;
BOOST_CHECK(partialBlock.FillBlock(block3, vtx_missing) == READ_STATUS_OK);
BOOST_CHECK(partialBlock.FillBlock(block3, {block.vtx[1]}) == READ_STATUS_OK);
BOOST_CHECK_EQUAL(block.GetHash().ToString(), block3.GetHash().ToString());
BOOST_CHECK_EQUAL(block.hashMerkleRoot.ToString(), BlockMerkleRoot(block3, &mutated).ToString());
BOOST_CHECK(!mutated);
@@ -181,17 +187,24 @@ BOOST_AUTO_TEST_CASE(NonCoinbasePreforwardRTTest)
BOOST_CHECK_EQUAL(pool.mapTx.find(block.vtx[2]->GetHash())->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1);

CBlock block2;
std::vector<CTransactionRef> vtx_missing;
BOOST_CHECK(partialBlock.FillBlock(block2, vtx_missing) == READ_STATUS_INVALID); // No transactions
{
PartiallyDownloadedBlock tmp = partialBlock;
BOOST_CHECK(partialBlock.FillBlock(block2, {}) == READ_STATUS_INVALID); // No transactions
partialBlock = tmp;
}

vtx_missing.push_back(block.vtx[1]); // Wrong transaction
partialBlock.FillBlock(block2, vtx_missing); // Current implementation doesn't check txn here, but don't require that
// Wrong transaction
{
PartiallyDownloadedBlock tmp = partialBlock;
partialBlock.FillBlock(block2, {block.vtx[1]}); // Current implementation doesn't check txn here, but don't require that
partialBlock = tmp;
}
bool mutated;
BOOST_CHECK(block.hashMerkleRoot != BlockMerkleRoot(block2, &mutated));

vtx_missing[0] = block.vtx[0];
CBlock block3;
BOOST_CHECK(partialBlock.FillBlock(block3, vtx_missing) == READ_STATUS_OK);
PartiallyDownloadedBlock partialBlockCopy = partialBlock;
BOOST_CHECK(partialBlock.FillBlock(block3, {block.vtx[0]}) == READ_STATUS_OK);
BOOST_CHECK_EQUAL(block.GetHash().ToString(), block3.GetHash().ToString());
BOOST_CHECK_EQUAL(block.hashMerkleRoot.ToString(), BlockMerkleRoot(block3, &mutated).ToString());
BOOST_CHECK(!mutated);
@@ -200,7 +213,7 @@ BOOST_AUTO_TEST_CASE(NonCoinbasePreforwardRTTest)
block.vtx.clear();
block2.vtx.clear();
block3.vtx.clear();
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1);
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1); // + 1 because of partialBlockCopy.
}
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 0);
}
@@ -240,8 +253,8 @@ BOOST_AUTO_TEST_CASE(SufficientPreforwardRTTest)
BOOST_CHECK_EQUAL(pool.mapTx.find(block.vtx[1]->GetHash())->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1);

CBlock block2;
std::vector<CTransactionRef> vtx_missing;
BOOST_CHECK(partialBlock.FillBlock(block2, vtx_missing) == READ_STATUS_OK);
PartiallyDownloadedBlock partialBlockCopy = partialBlock;
BOOST_CHECK(partialBlock.FillBlock(block2, {}) == READ_STATUS_OK);
BOOST_CHECK_EQUAL(block.GetHash().ToString(), block2.GetHash().ToString());
bool mutated;
BOOST_CHECK_EQUAL(block.hashMerkleRoot.ToString(), BlockMerkleRoot(block2, &mutated).ToString());
@@ -250,7 +263,7 @@ BOOST_AUTO_TEST_CASE(SufficientPreforwardRTTest)
txhash = block.vtx[1]->GetHash();
block.vtx.clear();
block2.vtx.clear();
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1);
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1); // + 1 because of partialBlockCopy.
}
BOOST_CHECK_EQUAL(pool.mapTx.find(txhash)->GetSharedTx().use_count(), SHARED_TX_OFFSET + 0);
}

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