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// Copyright (c) 2014-2019, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <db_cxx.h>
#include "blockchain_db/blockchain_db.h"
#include "cryptonote_basic/blobdatatype.h" // for type blobdata
#include <unordered_map>
#include <condition_variable>
// ND: Enables multi-threaded bulk reads for when getting indices.
// TODO: Disabled for now, as it doesn't seem to provide noticeable improvements (??. Reason: TBD.
// #define BDB_BULK_CAN_THREAD
namespace cryptonote
{
struct bdb_txn_safe
{
bdb_txn_safe() : m_txn(NULL) { }
~bdb_txn_safe()
{
LOG_PRINT_L3("bdb_txn_safe: destructor");
if (m_txn != NULL)
abort();
}
void commit(std::string message = "")
{
if (message.size() == 0)
{
message = "Failed to commit a transaction to the db";
}
if (m_txn->commit(0))
{
m_txn = NULL;
LOG_PRINT_L0(message);
throw DB_ERROR(message.c_str());
}
m_txn = NULL;
}
void abort()
{
LOG_PRINT_L3("bdb_txn_safe: abort()");
if(m_txn != NULL)
{
m_txn->abort();
m_txn = NULL;
}
else
{
LOG_PRINT_L0("WARNING: bdb_txn_safe: abort() called, but m_txn is NULL");
}
}
operator DbTxn*()
{
return m_txn;
}
operator DbTxn**()
{
return &m_txn;
}
private:
DbTxn* m_txn;
};
// ND: Class to handle buffer management when doing bulk queries
// (DB_MULTIPLE). Allocates buffers then handles thread queuing
// so a fixed set of buffers can be used (instead of allocating
// every time a bulk query is needed).
template <typename T>
class bdb_safe_buffer
{
// limit the number of buffers to 8
const size_t MaxAllowedBuffers = 8;
public:
bdb_safe_buffer(size_t num_buffers, size_t count)
{
if(num_buffers > MaxAllowedBuffers)
num_buffers = MaxAllowedBuffers;
set_count(num_buffers);
for (size_t i = 0; i < num_buffers; i++)
m_buffers.push_back((T) malloc(sizeof(T) * count));
m_buffer_count = count;
}
~bdb_safe_buffer()
{
for (size_t i = 0; i < m_buffers.size(); i++)
{
if (m_buffers[i])
{
free(m_buffers[i]);
m_buffers[i] = nullptr;
}
}
m_buffers.resize(0);
}
T acquire_buffer()
{
boost::unique_lock<boost::mutex> lock(m_lock);
m_cv.wait(lock, [&]{ return m_count > 0; });
--m_count;
size_t index = -1;
for (size_t i = 0; i < m_open_slot.size(); i++)
{
if (m_open_slot[i])
{
m_open_slot[i] = false;
index = i;
break;
}
}
assert(index >= 0);
T buffer = m_buffers[index];
m_buffer_map.emplace(buffer, index);
return buffer;
}
void release_buffer(T buffer)
{
boost::unique_lock<boost::mutex> lock(m_lock);
assert(buffer != nullptr);
auto it = m_buffer_map.find(buffer);
if (it != m_buffer_map.end())
{
auto index = it->second;
assert(index < m_open_slot.size());
assert(m_open_slot[index] == false);
assert(m_count < m_open_slot.size());
++m_count;
m_open_slot[index] = true;
m_buffer_map.erase(it);
m_cv.notify_one();
}
}
size_t get_buffer_size() const
{
return m_buffer_count * sizeof(T);
}
size_t get_buffer_count() const
{
return m_buffer_count;
}
typedef T type;
private:
void set_count(size_t count)
{
assert(count > 0);
m_open_slot.resize(count, true);
m_count = count;
}
std::vector<T> m_buffers;
std::unordered_map<T, size_t> m_buffer_map;
boost::condition_variable m_cv;
std::vector<bool> m_open_slot;
size_t m_count;
boost::mutex m_lock;
size_t m_buffer_count;
};
template <typename T>
class bdb_safe_buffer_autolock
{
public:
bdb_safe_buffer_autolock(T &safe_buffer, typename T::type &buffer) :
m_safe_buffer(safe_buffer), m_buffer(nullptr)
{
m_buffer = m_safe_buffer.acquire_buffer();
buffer = m_buffer;
}
~bdb_safe_buffer_autolock()
{
if (m_buffer != nullptr)
{
m_safe_buffer.release_buffer(m_buffer);
m_buffer = nullptr;
}
}
private:
T &m_safe_buffer;
typename T::type m_buffer;
};
class BlockchainBDB : public BlockchainDB
{
public:
BlockchainBDB(bool batch_transactions=false);
~BlockchainBDB();
virtual void open(const std::string& filename, const int db_flags);
virtual void close();
virtual void sync();
virtual void reset();
virtual std::vector<std::string> get_filenames() const;
virtual bool remove_data_file(const std::string& folder);
virtual std::string get_db_name() const;
virtual bool lock();
virtual void unlock();
virtual bool block_exists(const crypto::hash& h, uint64_t *height = NULL) const;
virtual block get_block(const crypto::hash& h) const;
virtual uint64_t get_block_height(const crypto::hash& h) const;
virtual block_header get_block_header(const crypto::hash& h) const;
virtual block get_block_from_height(const uint64_t& height) const;
virtual uint64_t get_block_timestamp(const uint64_t& height) const;
virtual uint64_t get_top_block_timestamp() const;
virtual size_t get_block_weight(const uint64_t& height) const;
virtual difficulty_type get_block_cumulative_difficulty(const uint64_t& height) const;
virtual difficulty_type get_block_difficulty(const uint64_t& height) const;
virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const;
virtual crypto::hash get_block_hash_from_height(const uint64_t& height) const;
virtual std::vector<block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const;
virtual std::vector<crypto::hash> get_hashes_range(const uint64_t& h1, const uint64_t& h2) const;
virtual crypto::hash top_block_hash() const;
virtual block get_top_block() const;
virtual uint64_t height() const;
virtual bool tx_exists(const crypto::hash& h) const;
virtual uint64_t get_tx_unlock_time(const crypto::hash& h) const;
virtual transaction get_tx(const crypto::hash& h) const;
virtual uint64_t get_tx_count() const;
virtual std::vector<transaction> get_tx_list(const std::vector<crypto::hash>& hlist) const;
virtual uint64_t get_tx_block_height(const crypto::hash& h) const;
virtual uint64_t get_num_outputs(const uint64_t& amount) const;
virtual uint64_t get_indexing_base() const { return 1; }
virtual output_data_t get_output_key(const uint64_t& amount, const uint64_t& index);
virtual void get_output_key(const uint64_t &amount, const std::vector<uint64_t> &offsets, std::vector<output_data_t> &outputs);
virtual tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const;
virtual void get_output_tx_and_index_from_global(const std::vector<uint64_t> &global_indices,
std::vector<tx_out_index> &tx_out_indices) const;
virtual tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index);
virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<tx_out_index> &indices);
virtual std::vector<uint64_t> get_tx_output_indices(const crypto::hash& h) const;
virtual std::vector<uint64_t> get_tx_amount_output_indices(const crypto::hash& h) const;
virtual bool has_key_image(const crypto::key_image& img) const;
virtual uint64_t add_block( const block& blk
, size_t block_weight
, const difficulty_type& cumulative_difficulty
, const uint64_t& coins_generated
, const std::vector<transaction>& txs
);
virtual void set_batch_transactions(bool batch_transactions);
virtual bool batch_start(uint64_t batch_num_blocks=0);
virtual void batch_commit();
virtual void batch_stop();
virtual void batch_abort();
virtual void block_txn_start(bool readonly);
virtual void block_txn_stop();
virtual void block_txn_abort();
virtual void pop_block(block& blk, std::vector<transaction>& txs);
#if defined(BDB_BULK_CAN_THREAD)
virtual bool can_thread_bulk_indices() const { return true; }
#else
virtual bool can_thread_bulk_indices() const { return false; }
#endif
/**
* @brief return a histogram of outputs on the blockchain
*
* @param amounts optional set of amounts to lookup
*
* @return a set of amount/instances
*/
std::map<uint64_t, uint64_t> get_output_histogram(const std::vector<uint64_t> &amounts) const;
private:
virtual void add_block( const block& blk
, size_t block_weight
, 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, const crypto::hash& tx_hash, const crypto::hash& tx_prunable_hash);
virtual void remove_transaction_data(const crypto::hash& tx_hash, const transaction& tx);
virtual void add_output(const crypto::hash& tx_hash, const tx_out& tx_output, const uint64_t& local_index, const uint64_t unlock_time, const rct::key *commitment);
virtual void remove_output(const tx_out& tx_output);
void remove_tx_outputs(const crypto::hash& tx_hash, const transaction& tx);
void remove_output(const uint64_t& out_index, const uint64_t amount);
void remove_amount_output_index(const uint64_t amount, const uint64_t global_output_index);
virtual void add_spent_key(const crypto::key_image& k_image);
virtual void remove_spent_key(const crypto::key_image& k_image);
void get_output_global_indices(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<uint64_t> &global_indices);
virtual bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const;
virtual bool for_all_blocks(std::function<bool(uint64_t, const crypto::hash&, const cryptonote::block&)>) const;
virtual bool for_all_transactions(std::function<bool(const crypto::hash&, const cryptonote::transaction&)>, bool pruned) const;
virtual bool for_all_outputs(std::function<bool(uint64_t amount, const crypto::hash &tx_hash, size_t tx_idx)> f) const;
// Hard fork related storage
virtual void set_hard_fork_version(uint64_t height, uint8_t version);
virtual uint8_t get_hard_fork_version(uint64_t height) const;
virtual void check_hard_fork_info();
virtual void drop_hard_fork_info();
/**
* @brief get the global index of the index-th output of the given amount
*
* @param amount the output amount
* @param index the index into the set of outputs of that amount
*
* @return the global index of the desired output
*/
uint64_t get_output_global_index(const uint64_t& amount, const uint64_t& index);
output_data_t get_output_key(const uint64_t& global_index) const;
void checkpoint_worker() const;
void check_open() const;
virtual bool is_read_only() const;
//
// fix up anything that may be wrong due to past bugs
virtual void fixup();
bool m_run_checkpoint;
std::unique_ptr<boost::thread> m_checkpoint_thread;
typedef bdb_safe_buffer<void *> bdb_safe_buffer_t;
bdb_safe_buffer_t m_buffer;
DbEnv* m_env;
Db* m_blocks;
Db* m_block_heights;
Db* m_block_hashes;
Db* m_block_timestamps;
Db* m_block_sizes;
Db* m_block_diffs;
Db* m_block_coins;
Db* m_txs;
Db* m_tx_unlocks;
Db* m_tx_heights;
Db* m_tx_outputs;
Db* m_output_txs;
Db* m_output_indices;
Db* m_output_amounts;
Db* m_output_keys;
Db* m_spent_keys;
Db* m_hf_starting_heights;
Db* m_hf_versions;
Db* m_properties;
uint64_t m_height;
uint64_t m_num_outputs;
std::string m_folder;
bdb_txn_safe *m_write_txn;
bool m_batch_transactions; // support for batch transactions
};
} // namespace cryptonote
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