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danicoin/src/cryptonote_core/tx_pool.cpp

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// Copyright (c) 2014-2016, 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.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include <algorithm>
#include <boost/filesystem.hpp>
#include <unordered_set>
#include <vector>
#include "tx_pool.h"
#include "cryptonote_tx_utils.h"
#include "cryptonote_basic/cryptonote_boost_serialization.h"
#include "cryptonote_config.h"
#include "blockchain.h"
#include "common/boost_serialization_helper.h"
#include "common/int-util.h"
#include "misc_language.h"
#include "warnings.h"
#include "common/perf_timer.h"
#include "crypto/hash.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "txpool"
DISABLE_VS_WARNINGS(4244 4345 4503) //'boost::foreach_detail_::or_' : decorated name length exceeded, name was truncated
namespace cryptonote
{
namespace
{
//TODO: constants such as these should at least be in the header,
// but probably somewhere more accessible to the rest of the
// codebase. As it stands, it is at best nontrivial to test
// whether or not changing these parameters (or adding new)
// will work correctly.
size_t const TRANSACTION_SIZE_LIMIT_V1 = (((CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1 * 125) / 100) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE);
size_t const TRANSACTION_SIZE_LIMIT_V2 = (((CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2 * 125) / 100) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE);
time_t const MIN_RELAY_TIME = (60 * 5); // only start re-relaying transactions after that many seconds
time_t const MAX_RELAY_TIME = (60 * 60 * 4); // at most that many seconds between resends
float const ACCEPT_THRESHOLD = 1.0f;
// a kind of increasing backoff within min/max bounds
time_t get_relay_delay(time_t now, time_t received)
{
time_t d = (now - received + MIN_RELAY_TIME) / MIN_RELAY_TIME * MIN_RELAY_TIME;
if (d > MAX_RELAY_TIME)
d = MAX_RELAY_TIME;
return d;
}
uint64_t template_accept_threshold(uint64_t amount)
{
return amount * ACCEPT_THRESHOLD;
}
}
//---------------------------------------------------------------------------------
//---------------------------------------------------------------------------------
tx_memory_pool::tx_memory_pool(Blockchain& bchs): m_blockchain(bchs)
{
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::add_tx(const transaction &tx, /*const crypto::hash& tx_prefix_hash,*/ const crypto::hash &id, size_t blob_size, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version)
{
PERF_TIMER(add_tx);
if (tx.version == 0)
{
// v0 never accepted
LOG_PRINT_L1("transaction version 0 is invalid");
tvc.m_verifivation_failed = true;
return false;
}
// we do not accept transactions that timed out before, unless they're
// kept_by_block
if (!kept_by_block && m_timed_out_transactions.find(id) != m_timed_out_transactions.end())
{
// not clear if we should set that, since verifivation (sic) did not fail before, since
// the tx was accepted before timing out.
tvc.m_verifivation_failed = true;
return false;
}
if(!check_inputs_types_supported(tx))
{
tvc.m_verifivation_failed = true;
tvc.m_invalid_input = true;
return false;
}
// fee per kilobyte, size rounded up.
uint64_t fee;
if (tx.version == 1)
{
uint64_t inputs_amount = 0;
if(!get_inputs_money_amount(tx, inputs_amount))
{
tvc.m_verifivation_failed = true;
return false;
}
uint64_t outputs_amount = get_outs_money_amount(tx);
if(outputs_amount >= inputs_amount)
{
LOG_PRINT_L1("transaction use more money then it has: use " << print_money(outputs_amount) << ", have " << print_money(inputs_amount));
tvc.m_verifivation_failed = true;
tvc.m_overspend = true;
return false;
}
fee = inputs_amount - outputs_amount;
}
else
{
fee = tx.rct_signatures.txnFee;
}
if (!kept_by_block && !m_blockchain.check_fee(blob_size, fee))
{
tvc.m_verifivation_failed = true;
tvc.m_fee_too_low = true;
return false;
}
size_t tx_size_limit = (version < 2 ? TRANSACTION_SIZE_LIMIT_V1 : TRANSACTION_SIZE_LIMIT_V2);
if (!kept_by_block && blob_size >= tx_size_limit)
{
LOG_PRINT_L1("transaction is too big: " << blob_size << " bytes, maximum size: " << tx_size_limit);
tvc.m_verifivation_failed = true;
tvc.m_too_big = true;
return false;
}
// if the transaction came from a block popped from the chain,
// don't check if we have its key images as spent.
// TODO: Investigate why not?
if(!kept_by_block)
{
if(have_tx_keyimges_as_spent(tx))
{
LOG_PRINT_L1("Transaction with id= "<< id << " used already spent key images");
tvc.m_verifivation_failed = true;
tvc.m_double_spend = true;
return false;
}
}
if (!m_blockchain.check_tx_outputs(tx, tvc))
{
LOG_PRINT_L1("Transaction with id= "<< id << " has at least one invalid output");
tvc.m_verifivation_failed = true;
tvc.m_invalid_output = true;
return false;
}
time_t receive_time = time(nullptr);
crypto::hash max_used_block_id = null_hash;
uint64_t max_used_block_height = 0;
tx_details txd;
txd.tx = tx;
bool ch_inp_res = m_blockchain.check_tx_inputs(txd.tx, max_used_block_height, max_used_block_id, tvc, kept_by_block);
CRITICAL_REGION_LOCAL(m_transactions_lock);
if(!ch_inp_res)
{
// if the transaction was valid before (kept_by_block), then it
// may become valid again, so ignore the failed inputs check.
if(kept_by_block)
{
auto txd_p = m_transactions.insert(transactions_container::value_type(id, txd));
CHECK_AND_ASSERT_MES(txd_p.second, false, "transaction already exists at inserting in memory pool");
txd_p.first->second.blob_size = blob_size;
txd_p.first->second.fee = fee;
txd_p.first->second.max_used_block_id = null_hash;
txd_p.first->second.max_used_block_height = 0;
txd_p.first->second.last_failed_height = 0;
txd_p.first->second.last_failed_id = null_hash;
txd_p.first->second.kept_by_block = kept_by_block;
txd_p.first->second.receive_time = receive_time;
txd_p.first->second.last_relayed_time = time(NULL);
txd_p.first->second.relayed = relayed;
txd_p.first->second.do_not_relay = do_not_relay;
tvc.m_verifivation_impossible = true;
tvc.m_added_to_pool = true;
}else
{
LOG_PRINT_L1("tx used wrong inputs, rejected");
tvc.m_verifivation_failed = true;
return false;
}
}else
{
//update transactions container
auto txd_p = m_transactions.insert(transactions_container::value_type(id, txd));
CHECK_AND_ASSERT_MES(txd_p.second, false, "internal error: transaction already exists at inserting in memorypool");
txd_p.first->second.blob_size = blob_size;
txd_p.first->second.kept_by_block = kept_by_block;
txd_p.first->second.fee = fee;
txd_p.first->second.max_used_block_id = max_used_block_id;
txd_p.first->second.max_used_block_height = max_used_block_height;
txd_p.first->second.last_failed_height = 0;
txd_p.first->second.last_failed_id = null_hash;
txd_p.first->second.receive_time = receive_time;
txd_p.first->second.last_relayed_time = time(NULL);
txd_p.first->second.relayed = relayed;
txd_p.first->second.do_not_relay = do_not_relay;
tvc.m_added_to_pool = true;
if(txd_p.first->second.fee > 0 && !do_not_relay)
tvc.m_should_be_relayed = true;
}
// assume failure during verification steps until success is certain
tvc.m_verifivation_failed = true;
for(const auto& in: tx.vin)
{
CHECKED_GET_SPECIFIC_VARIANT(in, const txin_to_key, txin, false);
std::unordered_set<crypto::hash>& kei_image_set = m_spent_key_images[txin.k_image];
CHECK_AND_ASSERT_MES(kept_by_block || kei_image_set.size() == 0, false, "internal error: kept_by_block=" << kept_by_block
<< ", kei_image_set.size()=" << kei_image_set.size() << ENDL << "txin.k_image=" << txin.k_image << ENDL
<< "tx_id=" << id );
auto ins_res = kei_image_set.insert(id);
CHECK_AND_ASSERT_MES(ins_res.second, false, "internal error: try to insert duplicate iterator in key_image set");
}
tvc.m_verifivation_failed = false;
m_txs_by_fee_and_receive_time.emplace(std::pair<double, std::time_t>(fee / (double)blob_size, receive_time), id);
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::add_tx(const transaction &tx, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay, uint8_t version)
{
crypto::hash h = null_hash;
size_t blob_size = 0;
get_transaction_hash(tx, h, blob_size);
return add_tx(tx, h, blob_size, tvc, keeped_by_block, relayed, do_not_relay, version);
}
//---------------------------------------------------------------------------------
//FIXME: Can return early before removal of all of the key images.
// At the least, need to make sure that a false return here
// is treated properly. Should probably not return early, however.
bool tx_memory_pool::remove_transaction_keyimages(const transaction& tx)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
// ND: Speedup
// 1. Move transaction hash calcuation outside of loop. ._.
crypto::hash actual_hash = get_transaction_hash(tx);
for(const txin_v& vi: tx.vin)
{
CHECKED_GET_SPECIFIC_VARIANT(vi, const txin_to_key, txin, false);
auto it = m_spent_key_images.find(txin.k_image);
CHECK_AND_ASSERT_MES(it != m_spent_key_images.end(), false, "failed to find transaction input in key images. img=" << txin.k_image << ENDL
<< "transaction id = " << get_transaction_hash(tx));
std::unordered_set<crypto::hash>& key_image_set = it->second;
CHECK_AND_ASSERT_MES(key_image_set.size(), false, "empty key_image set, img=" << txin.k_image << ENDL
<< "transaction id = " << actual_hash);
auto it_in_set = key_image_set.find(actual_hash);
CHECK_AND_ASSERT_MES(it_in_set != key_image_set.end(), false, "transaction id not found in key_image set, img=" << txin.k_image << ENDL
<< "transaction id = " << actual_hash);
key_image_set.erase(it_in_set);
if(!key_image_set.size())
{
//it is now empty hash container for this key_image
m_spent_key_images.erase(it);
}
}
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::take_tx(const crypto::hash &id, transaction &tx, size_t& blob_size, uint64_t& fee, bool &relayed, bool &do_not_relay)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
auto it = m_transactions.find(id);
if(it == m_transactions.end())
return false;
auto sorted_it = find_tx_in_sorted_container(id);
if (sorted_it == m_txs_by_fee_and_receive_time.end())
return false;
tx = it->second.tx;
blob_size = it->second.blob_size;
fee = it->second.fee;
relayed = it->second.relayed;
do_not_relay = it->second.do_not_relay;
remove_transaction_keyimages(it->second.tx);
m_transactions.erase(it);
m_txs_by_fee_and_receive_time.erase(sorted_it);
return true;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::on_idle()
{
m_remove_stuck_tx_interval.do_call([this](){return remove_stuck_transactions();});
}
//---------------------------------------------------------------------------------
sorted_tx_container::iterator tx_memory_pool::find_tx_in_sorted_container(const crypto::hash& id) const
{
return std::find_if( m_txs_by_fee_and_receive_time.begin(), m_txs_by_fee_and_receive_time.end()
, [&](const sorted_tx_container::value_type& a){
return a.second == id;
}
);
}
//---------------------------------------------------------------------------------
//TODO: investigate whether boolean return is appropriate
bool tx_memory_pool::remove_stuck_transactions()
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
for(auto it = m_transactions.begin(); it!= m_transactions.end();)
{
uint64_t tx_age = time(nullptr) - it->second.receive_time;
if((tx_age > CRYPTONOTE_MEMPOOL_TX_LIVETIME && !it->second.kept_by_block) ||
(tx_age > CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME && it->second.kept_by_block) )
{
LOG_PRINT_L1("Tx " << it->first << " removed from tx pool due to outdated, age: " << tx_age );
remove_transaction_keyimages(it->second.tx);
auto sorted_it = find_tx_in_sorted_container(it->first);
if (sorted_it == m_txs_by_fee_and_receive_time.end())
{
LOG_PRINT_L1("Removing tx " << it->first << " from tx pool, but it was not found in the sorted txs container!");
}
else
{
m_txs_by_fee_and_receive_time.erase(sorted_it);
}
m_timed_out_transactions.insert(it->first);
auto pit = it++;
m_transactions.erase(pit);
}else
++it;
}
return true;
}
//---------------------------------------------------------------------------------
//TODO: investigate whether boolean return is appropriate
bool tx_memory_pool::get_relayable_transactions(std::list<std::pair<crypto::hash, cryptonote::transaction>> &txs) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
const time_t now = time(NULL);
for(auto it = m_transactions.begin(); it!= m_transactions.end();)
{
// 0 fee transactions are never relayed
if(it->second.fee > 0 && !it->second.do_not_relay && now - it->second.last_relayed_time > get_relay_delay(now, it->second.receive_time))
{
// if the tx is older than half the max lifetime, we don't re-relay it, to avoid a problem
// mentioned by smooth where nodes would flush txes at slightly different times, causing
// flushed txes to be re-added when received from a node which was just about to flush it
time_t max_age = it->second.kept_by_block ? CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME : CRYPTONOTE_MEMPOOL_TX_LIVETIME;
if (now - it->second.receive_time <= max_age / 2)
{
txs.push_back(std::make_pair(it->first, it->second.tx));
}
}
++it;
}
return true;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::set_relayed(const std::list<std::pair<crypto::hash, cryptonote::transaction>> &txs)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
const time_t now = time(NULL);
for (auto it = txs.begin(); it != txs.end(); ++it)
{
auto i = m_transactions.find(it->first);
if (i != m_transactions.end())
{
i->second.relayed = true;
i->second.last_relayed_time = now;
}
}
}
//---------------------------------------------------------------------------------
size_t tx_memory_pool::get_transactions_count() const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
return m_transactions.size();
}
//---------------------------------------------------------------------------------
void tx_memory_pool::get_transactions(std::list<transaction>& txs) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
for(const auto& tx_vt: m_transactions)
txs.push_back(tx_vt.second.tx);
}
//------------------------------------------------------------------
//TODO: investigate whether boolean return is appropriate
bool tx_memory_pool::get_transactions_and_spent_keys_info(std::vector<tx_info>& tx_infos, std::vector<spent_key_image_info>& key_image_infos) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
for (const auto& tx_vt : m_transactions)
{
tx_info txi;
const tx_details& txd = tx_vt.second;
txi.id_hash = epee::string_tools::pod_to_hex(tx_vt.first);
txi.tx_json = obj_to_json_str(*const_cast<transaction*>(&txd.tx));
txi.blob_size = txd.blob_size;
txi.fee = txd.fee;
txi.kept_by_block = txd.kept_by_block;
txi.max_used_block_height = txd.max_used_block_height;
txi.max_used_block_id_hash = epee::string_tools::pod_to_hex(txd.max_used_block_id);
txi.last_failed_height = txd.last_failed_height;
txi.last_failed_id_hash = epee::string_tools::pod_to_hex(txd.last_failed_id);
txi.receive_time = txd.receive_time;
txi.relayed = txd.relayed;
txi.last_relayed_time = txd.last_relayed_time;
txi.do_not_relay = txd.do_not_relay;
tx_infos.push_back(txi);
}
for (const key_images_container::value_type& kee : m_spent_key_images) {
const crypto::key_image& k_image = kee.first;
const std::unordered_set<crypto::hash>& kei_image_set = kee.second;
spent_key_image_info ki;
ki.id_hash = epee::string_tools::pod_to_hex(k_image);
for (const crypto::hash& tx_id_hash : kei_image_set)
{
ki.txs_hashes.push_back(epee::string_tools::pod_to_hex(tx_id_hash));
}
key_image_infos.push_back(ki);
}
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::get_transaction(const crypto::hash& id, transaction& tx) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
auto it = m_transactions.find(id);
if(it == m_transactions.end())
return false;
tx = it->second.tx;
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::on_blockchain_inc(uint64_t new_block_height, const crypto::hash& top_block_id)
{
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::on_blockchain_dec(uint64_t new_block_height, const crypto::hash& top_block_id)
{
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_tx(const crypto::hash &id) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
if(m_transactions.count(id))
return true;
return false;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_tx_keyimges_as_spent(const transaction& tx) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
for(const auto& in: tx.vin)
{
CHECKED_GET_SPECIFIC_VARIANT(in, const txin_to_key, tokey_in, true);//should never fail
if(have_tx_keyimg_as_spent(tokey_in.k_image))
return true;
}
return false;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_tx_keyimg_as_spent(const crypto::key_image& key_im) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
return m_spent_key_images.end() != m_spent_key_images.find(key_im);
}
//---------------------------------------------------------------------------------
void tx_memory_pool::lock() const
{
m_transactions_lock.lock();
}
//---------------------------------------------------------------------------------
void tx_memory_pool::unlock() const
{
m_transactions_lock.unlock();
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::is_transaction_ready_to_go(tx_details& txd) const
{
//not the best implementation at this time, sorry :(
//check is ring_signature already checked ?
if(txd.max_used_block_id == null_hash)
{//not checked, lets try to check
if(txd.last_failed_id != null_hash && m_blockchain.get_current_blockchain_height() > txd.last_failed_height && txd.last_failed_id == m_blockchain.get_block_id_by_height(txd.last_failed_height))
return false;//we already sure that this tx is broken for this height
tx_verification_context tvc;
if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id, tvc))
{
txd.last_failed_height = m_blockchain.get_current_blockchain_height()-1;
txd.last_failed_id = m_blockchain.get_block_id_by_height(txd.last_failed_height);
return false;
}
}else
{
if(txd.max_used_block_height >= m_blockchain.get_current_blockchain_height())
return false;
if(true)
{
//if we already failed on this height and id, skip actual ring signature check
if(txd.last_failed_id == m_blockchain.get_block_id_by_height(txd.last_failed_height))
return false;
//check ring signature again, it is possible (with very small chance) that this transaction become again valid
tx_verification_context tvc;
if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id, tvc))
{
txd.last_failed_height = m_blockchain.get_current_blockchain_height()-1;
txd.last_failed_id = m_blockchain.get_block_id_by_height(txd.last_failed_height);
return false;
}
}
}
//if we here, transaction seems valid, but, anyway, check for key_images collisions with blockchain, just to be sure
if(m_blockchain.have_tx_keyimges_as_spent(txd.tx))
return false;
//transaction is ok.
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_key_images(const std::unordered_set<crypto::key_image>& k_images, const transaction& tx)
{
for(size_t i = 0; i!= tx.vin.size(); i++)
{
CHECKED_GET_SPECIFIC_VARIANT(tx.vin[i], const txin_to_key, itk, false);
if(k_images.count(itk.k_image))
return true;
}
return false;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::append_key_images(std::unordered_set<crypto::key_image>& k_images, const transaction& tx)
{
for(size_t i = 0; i!= tx.vin.size(); i++)
{
CHECKED_GET_SPECIFIC_VARIANT(tx.vin[i], const txin_to_key, itk, false);
auto i_res = k_images.insert(itk.k_image);
CHECK_AND_ASSERT_MES(i_res.second, false, "internal error: key images pool cache - inserted duplicate image in set: " << itk.k_image);
}
return true;
}
//---------------------------------------------------------------------------------
std::string tx_memory_pool::print_pool(bool short_format) const
{
std::stringstream ss;
CRITICAL_REGION_LOCAL(m_transactions_lock);
for (const transactions_container::value_type& txe : m_transactions) {
const tx_details& txd = txe.second;
ss << "id: " << txe.first << std::endl;
if (!short_format) {
ss << obj_to_json_str(*const_cast<transaction*>(&txd.tx)) << std::endl;
}
ss << "blob_size: " << txd.blob_size << std::endl
<< "fee: " << print_money(txd.fee) << std::endl
<< "kept_by_block: " << (txd.kept_by_block ? 'T' : 'F') << std::endl
<< "max_used_block_height: " << txd.max_used_block_height << std::endl
<< "max_used_block_id: " << txd.max_used_block_id << std::endl
<< "last_failed_height: " << txd.last_failed_height << std::endl
<< "last_failed_id: " << txd.last_failed_id << std::endl;
}
return ss.str();
}
//---------------------------------------------------------------------------------
//TODO: investigate whether boolean return is appropriate
bool tx_memory_pool::fill_block_template(block &bl, size_t median_size, uint64_t already_generated_coins, size_t &total_size, uint64_t &fee, uint8_t version)
{
// Warning: This function takes already_generated_
// coins as an argument and appears to do nothing
// with it.
CRITICAL_REGION_LOCAL(m_transactions_lock);
uint64_t best_coinbase = 0;
total_size = 0;
fee = 0;
//baseline empty block
get_block_reward(median_size, total_size, already_generated_coins, best_coinbase, version);
size_t max_total_size = 2 * median_size - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;
std::unordered_set<crypto::key_image> k_images;
LOG_PRINT_L2("Filling block template, median size " << median_size << ", " << m_txs_by_fee_and_receive_time.size() << " txes in the pool");
auto sorted_it = m_txs_by_fee_and_receive_time.begin();
while (sorted_it != m_txs_by_fee_and_receive_time.end())
{
auto tx_it = m_transactions.find(sorted_it->second);
LOG_PRINT_L2("Considering " << tx_it->first << ", size " << tx_it->second.blob_size << ", current block size " << total_size << "/" << max_total_size << ", current coinbase " << print_money(best_coinbase));
// Can not exceed maximum block size
if (max_total_size < total_size + tx_it->second.blob_size)
{
LOG_PRINT_L2(" would exceed maximum block size");
sorted_it++;
continue;
}
// If we're getting lower coinbase tx,
// stop including more tx
uint64_t block_reward;
if(!get_block_reward(median_size, total_size + tx_it->second.blob_size, already_generated_coins, block_reward, version))
{
LOG_PRINT_L2(" would exceed maximum block size");
sorted_it++;
continue;
}
uint64_t coinbase = block_reward + fee + tx_it->second.fee;
if (coinbase < template_accept_threshold(best_coinbase))
{
LOG_PRINT_L2(" would decrease coinbase to " << print_money(coinbase));
sorted_it++;
continue;
}
// Skip transactions that are not ready to be
// included into the blockchain or that are
// missing key images
if (!is_transaction_ready_to_go(tx_it->second) || have_key_images(k_images, tx_it->second.tx))
{
LOG_PRINT_L2(" not ready to go, or key images already seen");
sorted_it++;
continue;
}
bl.tx_hashes.push_back(tx_it->first);
total_size += tx_it->second.blob_size;
fee += tx_it->second.fee;
best_coinbase = coinbase;
append_key_images(k_images, tx_it->second.tx);
sorted_it++;
LOG_PRINT_L2(" added, new block size " << total_size << "/" << max_total_size << ", coinbase " << print_money(best_coinbase));
}
LOG_PRINT_L2("Block template filled with " << bl.tx_hashes.size() << " txes, size "
<< total_size << "/" << max_total_size << ", coinbase " << print_money(best_coinbase)
<< " (including " << print_money(fee) << " in fees)");
return true;
}
//---------------------------------------------------------------------------------
size_t tx_memory_pool::validate(uint8_t version)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
size_t n_removed = 0;
size_t tx_size_limit = (version < 2 ? TRANSACTION_SIZE_LIMIT_V1 : TRANSACTION_SIZE_LIMIT_V2);
for (auto it = m_transactions.begin(); it != m_transactions.end(); ) {
if (it->second.blob_size >= tx_size_limit) {
LOG_PRINT_L1("Transaction " << get_transaction_hash(it->second.tx) << " is too big (" << it->second.blob_size << " bytes), removing it from pool");
remove_transaction_keyimages(it->second.tx);
auto sorted_it = find_tx_in_sorted_container(it->first);
if (sorted_it == m_txs_by_fee_and_receive_time.end())
{
LOG_PRINT_L1("Removing tx " << it->first << " from tx pool, but it was not found in the sorted txs container!");
}
else
{
m_txs_by_fee_and_receive_time.erase(sorted_it);
}
auto pit = it++;
m_transactions.erase(pit);
++n_removed;
continue;
}
it++;
}
return n_removed;
}
//---------------------------------------------------------------------------------
//TODO: investigate whether only ever returning true is correct
bool tx_memory_pool::init(const std::string& config_folder)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
m_config_folder = config_folder;
if (m_config_folder.empty())
return true;
std::string state_file_path = config_folder + "/" + CRYPTONOTE_POOLDATA_FILENAME;
boost::system::error_code ec;
if(!boost::filesystem::exists(state_file_path, ec))
return true;
bool res = tools::unserialize_obj_from_file(*this, state_file_path);
if(!res)
{
LOG_ERROR("Failed to load memory pool from file " << state_file_path);
m_transactions.clear();
m_txs_by_fee_and_receive_time.clear();
m_spent_key_images.clear();
}
// no need to store queue of sorted transactions, as it's easy to generate.
for (const auto& tx : m_transactions)
{
m_txs_by_fee_and_receive_time.emplace(std::pair<double, time_t>(tx.second.fee / (double)tx.second.blob_size, tx.second.receive_time), tx.first);
}
// Ignore deserialization error
return true;
}
//---------------------------------------------------------------------------------
//TODO: investigate whether only ever returning true is correct
bool tx_memory_pool::deinit()
{
LOG_PRINT_L1("Received signal to deactivate memory pool store");
if (m_config_folder.empty())
{
LOG_PRINT_L1("Memory pool store already empty");
return true;
}
if (!tools::create_directories_if_necessary(m_config_folder))
{
LOG_ERROR("Failed to create memory pool data directory: " << m_config_folder);
return false;
}
std::string state_file_path = m_config_folder + "/" + CRYPTONOTE_POOLDATA_FILENAME;
bool res = tools::serialize_obj_to_file(*this, state_file_path);
if(!res)
{
LOG_ERROR("Failed to serialize memory pool to file " << state_file_path);
return false;
}
else
{
LOG_PRINT_L1("Memory pool store deactivated successfully");
return true;
}
}
}
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