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tx_pool.cpp
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tx_pool.cpp
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// Copyright (c) 2014-2023, 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 "blockchain_db/locked_txn.h"
#include "blockchain_db/blockchain_db.h"
#include "int-util.h"
#include "misc_language.h"
#include "warnings.h"
#include "common/perf_timer.h"
#include "crypto/hash.h"
#include "crypto/duration.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
using namespace crypto;
namespace cryptonote
{
namespace
{
/*! The Dandelion++ has formula for calculating the average embargo timeout:
(-k*(k-1)*hop)/(2*log(1-ep))
where k is the number of hops before this node and ep is the probability
that one of the k hops hits their embargo timer, and hop is the average
time taken between hops. So decreasing ep will make it more probable
that "this" node is the first to expire the embargo timer. Increasing k
will increase the number of nodes that will be "hidden" as a prior
recipient of the tx.
As example, k=5 and ep=0.1 means "this" embargo timer has a 90%
probability of being the first to expire amongst 5 nodes that saw the
tx before "this" one. These values are independent to the fluff
probability, but setting a low k with a low p (fluff probability) is
not ideal since a blackhole is more likely to reveal earlier nodes in
the chain.
This value was calculated with k=5, ep=0.10, and hop = 175 ms. A
testrun from a recent Intel laptop took ~80ms to
receive+parse+proces+send transaction. At least 50ms will be added to
the latency if crossing an ocean. So 175ms is the fudge factor for
a single hop with 39s being the embargo timer. */
constexpr const std::chrono::seconds dandelionpp_embargo_average{CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE};
//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.
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;
//! Max DB check interval for relayable txes
constexpr const std::chrono::minutes max_relayable_check{2};
constexpr const std::chrono::seconds forward_delay_average{CRYPTONOTE_FORWARD_DELAY_AVERAGE};
// a kind of increasing backoff within min/max bounds
uint64_t get_relay_delay(time_t last_relay, time_t received)
{
time_t d = (last_relay - 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;
}
uint64_t get_transaction_weight_limit(uint8_t version)
{
// from v8, limit a tx to 50% of the minimum block weight
if (version >= 8)
return get_min_block_weight(version) / 2 - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;
else
return get_min_block_weight(version) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;
}
// external lock must be held for the comparison+set to work properly
void set_if_less(std::atomic<time_t>& next_check, const time_t candidate) noexcept
{
if (candidate < next_check.load(std::memory_order_relaxed))
next_check = candidate;
}
}
//---------------------------------------------------------------------------------
//---------------------------------------------------------------------------------
tx_memory_pool::tx_memory_pool(Blockchain& bchs): m_blockchain(bchs), m_cookie(0), m_txpool_max_weight(DEFAULT_TXPOOL_MAX_WEIGHT), m_txpool_weight(0), m_mine_stem_txes(false), m_next_check(std::time(nullptr))
{
// class code expects unsigned values throughout
if (m_next_check < time_t(0))
throw std::runtime_error{"Unexpected time_t (system clock) value"};
m_added_txs_start_time = (time_t)0;
m_removed_txs_start_time = (time_t)0;
// We don't set these to "now" already here as we don't know how long it takes from construction
// of the pool until it "goes to work". It's safer to set when the first actual txs enter the
// corresponding lists.
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::add_tx(transaction &tx, /*const crypto::hash& tx_prefix_hash,*/ const crypto::hash &id, const cryptonote::blobdata &blob, size_t tx_weight, tx_verification_context& tvc, relay_method tx_relay, bool relayed, uint8_t version)
{
const bool kept_by_block = (tx_relay == relay_method::block);
// this should already be called with that lock, but let's make it explicit for clarity
CRITICAL_REGION_LOCAL(m_transactions_lock);
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 than it has: use " << print_money(outputs_amount) << ", have " << print_money(inputs_amount));
tvc.m_verifivation_failed = true;
tvc.m_overspend = true;
return false;
}
else if(outputs_amount == inputs_amount)
{
LOG_PRINT_L1("transaction fee is zero: outputs_amount == inputs_amount, rejecting.");
tvc.m_verifivation_failed = true;
tvc.m_fee_too_low = true;
return false;
}
fee = inputs_amount - outputs_amount;
}
else
{
fee = tx.rct_signatures.txnFee;
}
if (!kept_by_block && !m_blockchain.check_fee(tx_weight, fee))
{
tvc.m_verifivation_failed = true;
tvc.m_fee_too_low = true;
tvc.m_no_drop_offense = true;
return false;
}
size_t tx_weight_limit = get_transaction_weight_limit(version);
if ((!kept_by_block || version >= HF_VERSION_PER_BYTE_FEE) && tx_weight > tx_weight_limit)
{
LOG_PRINT_L1("transaction is too heavy: " << tx_weight << " bytes, maximum weight: " << tx_weight_limit);
tvc.m_verifivation_failed = true;
tvc.m_too_big = true;
return false;
}
size_t tx_extra_size = tx.extra.size();
if (!kept_by_block && tx_extra_size > MAX_TX_EXTRA_SIZE)
{
LOG_PRINT_L1("transaction tx-extra is too big: " << tx_extra_size << " bytes, the limit is: " << MAX_TX_EXTRA_SIZE);
tvc.m_verifivation_failed = true;
tvc.m_tx_extra_too_big = true;
tvc.m_no_drop_offense = 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, id))
{
mark_double_spend(tx);
LOG_PRINT_L1("Transaction with id= "<< id << " used already spent key images");
tvc.m_verifivation_failed = true;
tvc.m_double_spend = true;
tvc.m_no_drop_offense = 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;
}
// assume failure during verification steps until success is certain
tvc.m_verifivation_failed = true;
time_t receive_time = time(nullptr);
crypto::hash max_used_block_id = null_hash;
uint64_t max_used_block_height = 0;
cryptonote::txpool_tx_meta_t meta{};
bool ch_inp_res = check_tx_inputs([&tx]()->cryptonote::transaction&{ return tx; }, id, max_used_block_height, max_used_block_id, tvc, kept_by_block);
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)
{
meta.weight = tx_weight;
meta.fee = fee;
meta.max_used_block_id = null_hash;
meta.max_used_block_height = 0;
meta.last_failed_height = 0;
meta.last_failed_id = null_hash;
meta.receive_time = receive_time;
meta.last_relayed_time = time(NULL);
meta.relayed = relayed;
meta.set_relay_method(tx_relay);
meta.double_spend_seen = have_tx_keyimges_as_spent(tx, id);
meta.pruned = tx.pruned;
meta.bf_padding = 0;
memset(meta.padding, 0, sizeof(meta.padding));
try
{
if (kept_by_block)
m_parsed_tx_cache.insert(std::make_pair(id, tx));
CRITICAL_REGION_LOCAL1(m_blockchain);
LockedTXN lock(m_blockchain.get_db());
if (!insert_key_images(tx, id, tx_relay))
return false;
m_blockchain.add_txpool_tx(id, blob, meta);
add_tx_to_transient_lists(id, fee / (double)(tx_weight ? tx_weight : 1), receive_time);
lock.commit();
}
catch (const std::exception &e)
{
MERROR("Error adding transaction to txpool: " << e.what());
return false;
}
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;
tvc.m_invalid_input = true;
return false;
}
}else
{
try
{
if (kept_by_block)
m_parsed_tx_cache.insert(std::make_pair(id, tx));
CRITICAL_REGION_LOCAL1(m_blockchain);
LockedTXN lock(m_blockchain.get_db());
const bool existing_tx = m_blockchain.get_txpool_tx_meta(id, meta);
if (existing_tx)
{
/* If Dandelion++ loop. Do not use txes in the `local` state in the
loop detection - txes in that state should be outgoing over i2p/tor
then routed back via public dandelion++ stem. Pretend to be
another stem node in that situation, a loop over the public
network hasn't been hit yet. */
if (tx_relay == relay_method::stem && meta.dandelionpp_stem)
tx_relay = relay_method::fluff;
}
else
meta.set_relay_method(relay_method::none);
if (meta.upgrade_relay_method(tx_relay) || !existing_tx) // synchronize with embargo timer or stem/fluff out-of-order messages
{
using clock = std::chrono::system_clock;
auto last_relayed_time = std::numeric_limits<decltype(meta.last_relayed_time)>::max();
if (tx_relay == relay_method::forward)
{
last_relayed_time = clock::to_time_t(clock::now() + crypto::random_poisson_seconds{forward_delay_average}());
set_if_less(m_next_check, time_t(last_relayed_time));
}
// else the `set_relayed` function will adjust the time accordingly later
//update transactions container
meta.last_relayed_time = last_relayed_time;
meta.receive_time = receive_time;
meta.weight = tx_weight;
meta.fee = fee;
meta.max_used_block_id = max_used_block_id;
meta.max_used_block_height = max_used_block_height;
meta.last_failed_height = 0;
meta.last_failed_id = null_hash;
meta.relayed = relayed;
meta.double_spend_seen = false;
meta.pruned = tx.pruned;
meta.bf_padding = 0;
memset(meta.padding, 0, sizeof(meta.padding));
if (!insert_key_images(tx, id, tx_relay))
return false;
m_blockchain.remove_txpool_tx(id);
m_blockchain.add_txpool_tx(id, blob, meta);
add_tx_to_transient_lists(id, meta.fee / (double)(tx_weight ? tx_weight : 1), receive_time);
}
lock.commit();
}
catch (const std::exception &e)
{
MERROR("internal error: error adding transaction to txpool: " << e.what());
return false;
}
tvc.m_added_to_pool = true;
static_assert(unsigned(relay_method::none) == 0, "expected relay_method::none value to be zero");
if(meta.fee > 0 && tx_relay != relay_method::forward)
tvc.m_relay = tx_relay;
}
tvc.m_verifivation_failed = false;
m_txpool_weight += tx_weight;
++m_cookie;
MINFO("Transaction added to pool: txid " << id << " weight: " << tx_weight << " fee/byte: " << (fee / (double)(tx_weight ? tx_weight : 1)) << ", count: " << m_added_txs_by_id.size());
prune(m_txpool_max_weight);
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::add_tx(transaction &tx, tx_verification_context& tvc, relay_method tx_relay, bool relayed, uint8_t version)
{
crypto::hash h = null_hash;
cryptonote::blobdata bl;
t_serializable_object_to_blob(tx, bl);
if (bl.size() == 0 || !get_transaction_hash(tx, h))
return false;
return add_tx(tx, h, bl, get_transaction_weight(tx, bl.size()), tvc, tx_relay, relayed, version);
}
//---------------------------------------------------------------------------------
size_t tx_memory_pool::get_txpool_weight() const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
return m_txpool_weight;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::set_txpool_max_weight(size_t bytes)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
m_txpool_max_weight = bytes;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::reduce_txpool_weight(size_t weight)
{
if (weight > m_txpool_weight)
{
MERROR("Underflow in txpool weight");
m_txpool_weight = 0;
}
else
{
m_txpool_weight -= weight;
}
}
//---------------------------------------------------------------------------------
void tx_memory_pool::prune(size_t bytes)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
// Nothing to do if already empty
if (m_txs_by_fee_and_receive_time.empty())
return;
if (bytes == 0)
bytes = m_txpool_max_weight;
CRITICAL_REGION_LOCAL1(m_blockchain);
LockedTXN lock(m_blockchain.get_db());
bool changed = false;
// this will never remove the first one, but we don't care
auto it = --m_txs_by_fee_and_receive_time.end();
while (it != m_txs_by_fee_and_receive_time.begin())
{
if (m_txpool_weight <= bytes)
break;
try
{
const crypto::hash &txid = it->second;
txpool_tx_meta_t meta;
if (!m_blockchain.get_txpool_tx_meta(txid, meta))
{
static bool warned = false;
if (!warned)
{
MERROR("Failed to find tx_meta in txpool (will only print once)");
warned = true;
}
--it;
continue;
}
// don't prune the kept_by_block ones, they're likely added because we're adding a block with those
if (meta.kept_by_block)
{
--it;
continue;
}
cryptonote::blobdata txblob = m_blockchain.get_txpool_tx_blob(txid, relay_category::all);
cryptonote::transaction_prefix tx;
if (!parse_and_validate_tx_prefix_from_blob(txblob, tx))
{
MERROR("Failed to parse tx from txpool");
return;
}
// remove first, in case this throws, so key images aren't removed
MINFO("Pruning tx " << txid << " from txpool: weight: " << meta.weight << ", fee/byte: " << it->first.first);
m_blockchain.remove_txpool_tx(txid);
reduce_txpool_weight(meta.weight);
remove_transaction_keyimages(tx, txid);
MINFO("Pruned tx " << txid << " from txpool: weight: " << meta.weight << ", fee/byte: " << it->first.first);
auto it_prev = it;
--it_prev;
remove_tx_from_transient_lists(it, txid, !meta.matches(relay_category::broadcasted));
it = it_prev;
changed = true;
}
catch (const std::exception &e)
{
MERROR("Error while pruning txpool: " << e.what());
return;
}
}
lock.commit();
if (changed)
++m_cookie;
if (m_txpool_weight > bytes)
MINFO("Pool weight after pruning is larger than limit: " << m_txpool_weight << "/" << bytes);
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::insert_key_images(const transaction_prefix &tx, const crypto::hash &id, relay_method tx_relay)
{
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];
// Only allow multiple txes per key-image if kept-by-block. Only allow
// the same txid if going from local/stem->fluff.
if (tx_relay != relay_method::block)
{
const bool one_txid =
(kei_image_set.empty() || (kei_image_set.size() == 1 && *(kei_image_set.cbegin()) == id));
CHECK_AND_ASSERT_MES(one_txid, false, "internal error: tx_relay=" << unsigned(tx_relay)
<< ", kei_image_set.size()=" << kei_image_set.size() << ENDL << "txin.k_image=" << txin.k_image << ENDL
<< "tx_id=" << id);
}
const bool new_or_previously_private =
kei_image_set.insert(id).second ||
!m_blockchain.txpool_tx_matches_category(id, relay_category::legacy);
CHECK_AND_ASSERT_MES(new_or_previously_private, false, "internal error: try to insert duplicate iterator in key_image set");
}
++m_cookie;
return true;
}
//---------------------------------------------------------------------------------
//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_prefix& tx, const crypto::hash &actual_hash)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
// ND: Speedup
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 = " << actual_hash);
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);
}
}
++m_cookie;
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::take_tx(const crypto::hash &id, transaction &tx, cryptonote::blobdata &txblob, size_t& tx_weight, uint64_t& fee, bool &relayed, bool &do_not_relay, bool &double_spend_seen, bool &pruned)
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
bool sensitive = false;
try
{
LockedTXN lock(m_blockchain.get_db());
txpool_tx_meta_t meta;
if (!m_blockchain.get_txpool_tx_meta(id, meta))
{
MERROR("Failed to find tx_meta in txpool");
return false;
}
txblob = m_blockchain.get_txpool_tx_blob(id, relay_category::all);
auto ci = m_parsed_tx_cache.find(id);
if (ci != m_parsed_tx_cache.end())
{
tx = ci->second;
}
else if (!(meta.pruned ? parse_and_validate_tx_base_from_blob(txblob, tx) : parse_and_validate_tx_from_blob(txblob, tx)))
{
MERROR("Failed to parse tx from txpool");
return false;
}
else
{
tx.set_hash(id);
}
tx_weight = meta.weight;
fee = meta.fee;
relayed = meta.relayed;
do_not_relay = meta.do_not_relay;
double_spend_seen = meta.double_spend_seen;
pruned = meta.pruned;
sensitive = !meta.matches(relay_category::broadcasted);
// remove first, in case this throws, so key images aren't removed
m_blockchain.remove_txpool_tx(id);
reduce_txpool_weight(tx_weight);
remove_transaction_keyimages(tx, id);
lock.commit();
}
catch (const std::exception &e)
{
MERROR("Failed to remove tx from txpool: " << e.what());
return false;
}
remove_tx_from_transient_lists(find_tx_in_sorted_container(id), id, sensitive);
++m_cookie;
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::get_transaction_info(const crypto::hash &txid, tx_details &td, bool include_sensitive_data, bool include_blob) const
{
PERF_TIMER(get_transaction_info);
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
try
{
LockedTXN lock(m_blockchain.get_db());
txpool_tx_meta_t meta;
if (!m_blockchain.get_txpool_tx_meta(txid, meta))
{
LOG_PRINT_L2("Failed to find tx in txpool: " << txid);
return false;
}
if (!include_sensitive_data && !meta.matches(relay_category::broadcasted))
{
// We don't want sensitive data && the tx is sensitive, so no need to return it
return false;
}
cryptonote::blobdata txblob = m_blockchain.get_txpool_tx_blob(txid, relay_category::all);
auto ci = m_parsed_tx_cache.find(txid);
if (ci != m_parsed_tx_cache.end())
{
td.tx = ci->second;
}
else if (!(meta.pruned ? parse_and_validate_tx_base_from_blob(txblob, td.tx) : parse_and_validate_tx_from_blob(txblob, td.tx)))
{
MERROR("Failed to parse tx from txpool");
return false;
}
else
{
td.tx.set_hash(txid);
}
td.blob_size = txblob.size();
td.weight = meta.weight;
td.fee = meta.fee;
td.max_used_block_id = meta.max_used_block_id;
td.max_used_block_height = meta.max_used_block_height;
td.kept_by_block = meta.kept_by_block;
td.last_failed_height = meta.last_failed_height;
td.last_failed_id = meta.last_failed_id;
td.receive_time = include_sensitive_data ? meta.receive_time : 0;
td.last_relayed_time = (include_sensitive_data && !meta.dandelionpp_stem) ? meta.last_relayed_time : 0;
td.relayed = meta.relayed;
td.do_not_relay = meta.do_not_relay;
td.double_spend_seen = meta.double_spend_seen;
if (include_blob)
td.tx_blob = std::move(txblob);
}
catch (const std::exception &e)
{
MERROR("Failed to get tx from txpool: " << e.what());
return false;
}
return true;
}
//------------------------------------------------------------------
bool tx_memory_pool::get_transactions_info(const std::vector<crypto::hash>& txids, std::vector<std::pair<crypto::hash, tx_details>>& txs, bool include_sensitive) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
txs.clear();
for (const auto &it: txids)
{
tx_details details;
bool success = get_transaction_info(it, details, include_sensitive, true/*include_blob*/);
if (success)
{
txs.push_back(std::make_pair(it, std::move(details)));
}
}
return true;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::get_complement(const std::vector<crypto::hash> &hashes, std::vector<cryptonote::blobdata> &txes) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
m_blockchain.for_all_txpool_txes([this, &hashes, &txes](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata_ref*) {
const auto tx_relay_method = meta.get_relay_method();
if (tx_relay_method != relay_method::block && tx_relay_method != relay_method::fluff)
return true;
const auto i = std::find(hashes.begin(), hashes.end(), txid);
if (i == hashes.end())
{
cryptonote::blobdata bd;
try
{
if (!m_blockchain.get_txpool_tx_blob(txid, bd, cryptonote::relay_category::broadcasted))
{
MERROR("Failed to get blob for txpool transaction " << txid);
return true;
}
txes.emplace_back(std::move(bd));
}
catch (const std::exception &e)
{
MERROR("Failed to get blob for txpool transaction " << txid << ": " << e.what());
return true;
}
}
return true;
}, false);
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);
CRITICAL_REGION_LOCAL1(m_blockchain);
std::list<std::pair<crypto::hash, uint64_t>> remove;
m_blockchain.for_all_txpool_txes([this, &remove](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata_ref*) {
uint64_t tx_age = time(nullptr) - meta.receive_time;
if((tx_age > CRYPTONOTE_MEMPOOL_TX_LIVETIME && !meta.kept_by_block) ||
(tx_age > CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME && meta.kept_by_block) )
{
LOG_PRINT_L1("Tx " << txid << " removed from tx pool due to outdated, age: " << tx_age );
remove_tx_from_transient_lists(find_tx_in_sorted_container(txid), txid, !meta.matches(relay_category::broadcasted));
m_timed_out_transactions.insert(txid);
remove.push_back(std::make_pair(txid, meta.weight));
}
return true;
}, false, relay_category::all);
if (!remove.empty())
{
LockedTXN lock(m_blockchain.get_db());
for (const std::pair<crypto::hash, uint64_t> &entry: remove)
{
const crypto::hash &txid = entry.first;
try
{
cryptonote::blobdata bd = m_blockchain.get_txpool_tx_blob(txid, relay_category::all);
cryptonote::transaction_prefix tx;
if (!parse_and_validate_tx_prefix_from_blob(bd, tx))
{
MERROR("Failed to parse tx from txpool");
// continue
}
else
{
// remove first, so we only remove key images if the tx removal succeeds
m_blockchain.remove_txpool_tx(txid);
reduce_txpool_weight(entry.second);
remove_transaction_keyimages(tx, txid);
}
}
catch (const std::exception &e)
{
MWARNING("Failed to remove stuck transaction: " << txid);
// ignore error
}
}
lock.commit();
++m_cookie;
}
return true;
}
//---------------------------------------------------------------------------------
//TODO: investigate whether boolean return is appropriate
bool tx_memory_pool::get_relayable_transactions(std::vector<std::tuple<crypto::hash, cryptonote::blobdata, relay_method>> &txs)
{
using clock = std::chrono::system_clock;
const uint64_t now = time(NULL);
if (uint64_t{std::numeric_limits<time_t>::max()} < now || time_t(now) < m_next_check)
return false;
uint64_t next_check = clock::to_time_t(clock::from_time_t(time_t(now)) + max_relayable_check);
std::vector<std::pair<crypto::hash, txpool_tx_meta_t>> change_timestamps;
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
LockedTXN lock(m_blockchain.get_db());
txs.reserve(m_blockchain.get_txpool_tx_count());
m_blockchain.for_all_txpool_txes([this, now, &txs, &change_timestamps, &next_check](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata_ref *){
// 0 fee transactions are never relayed
if(!meta.pruned && meta.fee > 0 && !meta.do_not_relay)
{
const relay_method tx_relay = meta.get_relay_method();
switch (tx_relay)
{
case relay_method::stem:
case relay_method::forward:
if (meta.last_relayed_time > now)
{
next_check = std::min(next_check, meta.last_relayed_time);
return true; // continue to next tx
}
change_timestamps.emplace_back(txid, meta);
break;
default:
case relay_method::none:
return true;
case relay_method::local:
case relay_method::fluff:
case relay_method::block:
if (now - meta.last_relayed_time <= get_relay_delay(meta.last_relayed_time, meta.receive_time))
return true; // continue to next tx
break;
}
// 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
uint64_t max_age = (tx_relay == relay_method::block) ? CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME : CRYPTONOTE_MEMPOOL_TX_LIVETIME;
if (now - meta.receive_time <= max_age / 2)
{
try
{
txs.emplace_back(txid, m_blockchain.get_txpool_tx_blob(txid, relay_category::all), tx_relay);
}
catch (const std::exception &e)
{
MERROR("Failed to get transaction blob from db");
// ignore error
}
}
}
return true;
}, false, relay_category::relayable);
for (auto& elem : change_timestamps)
{
/* These transactions are still in forward or stem state, so the field
represents the next time a relay should be attempted. Will be
overwritten when the state is upgraded to stem, fluff or block. This
function is only called every ~2 minutes, so this resetting should be
unnecessary, but is primarily a precaution against potential changes
to the callback routines. */
elem.second.last_relayed_time = now + get_relay_delay(elem.second.last_relayed_time, elem.second.receive_time);
m_blockchain.update_txpool_tx(elem.first, elem.second);
}
m_next_check = time_t(next_check);
return true;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::set_relayed(const epee::span<const crypto::hash> hashes, const relay_method method, std::vector<bool> &just_broadcasted)
{
just_broadcasted.clear();
crypto::random_poisson_seconds embargo_duration{dandelionpp_embargo_average};
const auto now = std::chrono::system_clock::now();
uint64_t next_relay = uint64_t{std::numeric_limits<time_t>::max()};
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
LockedTXN lock(m_blockchain.get_db());
for (const auto& hash : hashes)
{
bool was_just_broadcasted = false;
try
{
txpool_tx_meta_t meta;
if (m_blockchain.get_txpool_tx_meta(hash, meta))
{
// txes can be received as "stem" or "fluff" in either order
const bool already_broadcasted = meta.matches(relay_category::broadcasted);
meta.upgrade_relay_method(method);
meta.relayed = true;
if (meta.dandelionpp_stem)
{
meta.last_relayed_time = std::chrono::system_clock::to_time_t(now + embargo_duration());
next_relay = std::min(next_relay, meta.last_relayed_time);
}
else
meta.last_relayed_time = std::chrono::system_clock::to_time_t(now);
m_blockchain.update_txpool_tx(hash, meta);
// wait until db update succeeds to ensure tx is visible in the pool
was_just_broadcasted = !already_broadcasted && meta.matches(relay_category::broadcasted);
if (was_just_broadcasted)
// Make sure the tx gets re-added with an updated time
add_tx_to_transient_lists(hash, meta.fee / (double)meta.weight, std::chrono::system_clock::to_time_t(now));
}
}
catch (const std::exception &e)
{
MERROR("Failed to update txpool transaction metadata: " << e.what());
// continue
}
just_broadcasted.emplace_back(was_just_broadcasted);
}
lock.commit();
set_if_less(m_next_check, time_t(next_relay));
}
//---------------------------------------------------------------------------------
size_t tx_memory_pool::get_transactions_count(bool include_sensitive) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
return m_blockchain.get_txpool_tx_count(include_sensitive);
}
//---------------------------------------------------------------------------------
void tx_memory_pool::get_transactions(std::vector<transaction>& txs, bool include_sensitive) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
const relay_category category = include_sensitive ? relay_category::all : relay_category::broadcasted;
txs.reserve(m_blockchain.get_txpool_tx_count(include_sensitive));
m_blockchain.for_all_txpool_txes([&txs](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata_ref *bd){
transaction tx;
if (!(meta.pruned ? parse_and_validate_tx_base_from_blob(*bd, tx) : parse_and_validate_tx_from_blob(*bd, tx)))
{
MERROR("Failed to parse tx from txpool");
// continue
return true;
}
tx.set_hash(txid);
txs.push_back(std::move(tx));
return true;
}, true, category);
}
//------------------------------------------------------------------
void tx_memory_pool::get_transaction_hashes(std::vector<crypto::hash>& txs, bool include_sensitive) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
const relay_category category = include_sensitive ? relay_category::all : relay_category::broadcasted;
txs.reserve(m_blockchain.get_txpool_tx_count(include_sensitive));
m_blockchain.for_all_txpool_txes([&txs](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata_ref *bd){
txs.push_back(txid);
return true;
}, false, category);
}
//------------------------------------------------------------------
bool tx_memory_pool::get_pool_info(time_t start_time, bool include_sensitive, size_t max_tx_count, std::vector<std::pair<crypto::hash, tx_details>>& added_txs, std::vector<crypto::hash>& remaining_added_txids, std::vector<crypto::hash>& removed_txs, bool& incremental) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
incremental = true;
if (start_time == (time_t)0)
{
// Giving no start time means give back whole pool
incremental = false;
}
else if ((m_added_txs_start_time != (time_t)0) && (m_removed_txs_start_time != (time_t)0))
{
if ((start_time <= m_added_txs_start_time) || (start_time <= m_removed_txs_start_time))
{
// If either of the two lists do not go back far enough it's not possible to
// deliver incremental pool info
incremental = false;
}
// The check uses "<=": We cannot be sure to have ALL txs exactly at start_time, only AFTER that time
}
else