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Improve block and tx processing efficiency by less repeat hashing

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BlockchainLMDB::add_block()
  BlockchainLMDB::add_transaction_data()

  BlockchainDB::add_transaction()
This commit is contained in:
warptangent 2015-02-11 15:55:53 -08:00
parent 3676ac5841
commit 8909d7d82e
No known key found for this signature in database
GPG key ID: 0E490BEBFBE4E92D
4 changed files with 28 additions and 11 deletions
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7
src/cryptonote_core/BlockchainDB_impl/db_lmdb.cpp
View file

@ -152,12 +152,13 @@ void BlockchainLMDB::add_block( const block& blk
, const size_t& block_size
, const difficulty_type& cumulative_difficulty
, const uint64_t& coins_generated
, const crypto::hash& blk_hash
)
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open();
MDB_val_copy<crypto::hash> val_h(get_block_hash(blk));
MDB_val_copy<crypto::hash> val_h(blk_hash);
MDB_val unused;
if (mdb_get(*m_write_txn, m_block_heights, &val_h, &unused) == 0)
throw1(BLOCK_EXISTS("Attempting to add block that's already in the db"));
@ -243,12 +244,12 @@ void BlockchainLMDB::remove_block()
throw1(DB_ERROR("Failed to add removal of block hash to db transaction"));
}
void BlockchainLMDB::add_transaction_data(const crypto::hash& blk_hash, const transaction& tx)
void BlockchainLMDB::add_transaction_data(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash& tx_hash)
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open();
MDB_val_copy<crypto::hash> val_h(get_transaction_hash(tx));
MDB_val_copy<crypto::hash> val_h(tx_hash);
MDB_val unused;
if (mdb_get(*m_write_txn, m_txs, &val_h, &unused) == 0)
throw1(TX_EXISTS("Attempting to add transaction that's already in the db"));

3
src/cryptonote_core/BlockchainDB_impl/db_lmdb.h
View file

@ -184,11 +184,12 @@ private:
, const size_t& block_size
, const difficulty_type& cumulative_difficulty
, const uint64_t& coins_generated
, const crypto::hash& block_hash
);
virtual void remove_block();
virtual void add_transaction_data(const crypto::hash& blk_hash, const transaction& tx);
virtual void add_transaction_data(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash& tx_hash);
virtual void remove_transaction_data(const crypto::hash& tx_hash, const transaction& tx);

24
src/cryptonote_core/blockchain_db.cpp
View file

@ -42,11 +42,21 @@ void BlockchainDB::pop_block()
pop_block(blk, txs);
}
void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transaction& tx)
void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash* tx_hash_ptr)
{
crypto::hash tx_hash = get_transaction_hash(tx);
crypto::hash tx_hash;
if (!tx_hash_ptr)
{
// should only need to compute hash for miner transactions
tx_hash = get_transaction_hash(tx);
LOG_PRINT_L3("null tx_hash_ptr - needed to compute: " << tx_hash);
}
else
{
tx_hash = *tx_hash_ptr;
}
add_transaction_data(blk_hash, tx);
add_transaction_data(blk_hash, tx, tx_hash);
// iterate tx.vout using indices instead of C++11 foreach syntax because
// we need the index
@ -81,7 +91,7 @@ uint64_t BlockchainDB::add_block( const block& blk
// call out to subclass implementation to add the block & metadata
time1 = epee::misc_utils::get_tick_count();
add_block(blk, block_size, cumulative_difficulty, coins_generated);
add_block(blk, block_size, cumulative_difficulty, coins_generated, blk_hash);
TIME_MEASURE_FINISH(time1);
time_add_block1 += time1;
@ -89,9 +99,13 @@ uint64_t BlockchainDB::add_block( const block& blk
time1 = epee::misc_utils::get_tick_count();
add_transaction(blk_hash, blk.miner_tx);
int tx_i = 0;
crypto::hash tx_hash = null_hash;
for (const transaction& tx : txs)
{
add_transaction(blk_hash, tx);
tx_hash = blk.tx_hashes[tx_i];
add_transaction(blk_hash, tx, &tx_hash);
++tx_i;
}
TIME_MEASURE_FINISH(time1);
time_add_transaction += time1;

5
src/cryptonote_core/blockchain_db.h
View file

@ -265,13 +265,14 @@ private:
, const size_t& block_size
, const difficulty_type& cumulative_difficulty
, const uint64_t& coins_generated
, const crypto::hash& blk_hash
) = 0;
// tells the subclass to remove data about the top block
virtual void remove_block() = 0;
// tells the subclass to store the transaction and its metadata
virtual void add_transaction_data(const crypto::hash& blk_hash, const transaction& tx) = 0;
virtual void add_transaction_data(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash& tx_hash) = 0;
// tells the subclass to remove data about a transaction
virtual void remove_transaction_data(const crypto::hash& tx_hash, const transaction& tx) = 0;
@ -296,7 +297,7 @@ private:
void pop_block();
// helper function for add_transactions, to add each individual tx
void add_transaction(const crypto::hash& blk_hash, const transaction& tx);
void add_transaction(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash* tx_hash_ptr = NULL);
// helper function to remove transaction from blockchain
void remove_transaction(const crypto::hash& tx_hash);