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monero/src/cryptonote_core/tx_pool.h

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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
#pragma once
#include "include_base_utils.h"
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <queue>
#include <boost/serialization/version.hpp>
#include <boost/utility.hpp>
#include "string_tools.h"
#include "syncobj.h"
#include "math_helper.h"
#include "cryptonote_basic/cryptonote_basic_impl.h"
#include "cryptonote_basic/verification_context.h"
#include "crypto/hash.h"
#include "rpc/core_rpc_server_commands_defs.h"
namespace cryptonote
{
class Blockchain;
/************************************************************************/
/* */
/************************************************************************/
//! pair of <transaction fee, transaction hash> for organization
typedef std::pair<std::pair<double, std::time_t>, crypto::hash> tx_by_fee_and_receive_time_entry;
class txCompare
{
public:
bool operator()(const tx_by_fee_and_receive_time_entry& a, const tx_by_fee_and_receive_time_entry& b)
{
// sort by greatest first, not least
if (a.first.first > b.first.first) return true;
else if (a.first.first < b.first.first) return false;
else if (a.first.second < b.first.second) return true;
else if (a.first.second > b.first.second) return false;
else if (a.second != b.second) return true;
else return false;
}
};
//! container for sorting transactions by fee per unit size
typedef std::set<tx_by_fee_and_receive_time_entry, txCompare> sorted_tx_container;
/**
* @brief Transaction pool, handles transactions which are not part of a block
*
* This class handles all transactions which have been received, but not as
* part of a block.
*
* This handling includes:
* storing the transactions
* organizing the transactions by fee per size
* taking/giving transactions to and from various other components
* saving the transactions to disk on shutdown
* helping create a new block template by choosing transactions for it
*
*/
class tx_memory_pool: boost::noncopyable
{
public:
/**
* @brief Constructor
*
* @param bchs a Blockchain class instance, for getting chain info
*/
tx_memory_pool(Blockchain& bchs);
/**
* @copydoc add_tx(const transaction&, tx_verification_context&, bool, bool, uint8_t)
*
* @param id the transaction's hash
* @param blob_size the transaction's size
*/
bool add_tx(const transaction &tx, 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);
/**
* @brief add a transaction to the transaction pool
*
* Most likely the transaction will come from the network, but it is
* also possible for transactions to come from popped blocks during
* a reorg, or from local clients creating a transaction and
* submitting it to the network
*
* @param tx the transaction to be added
* @param tvc return-by-reference status about the transaction verification
* @param kept_by_block has this transaction been in a block?
* @param relayed was this transaction from the network or a local client?
* @param do_not_relay to avoid relaying the transaction to the network
* @param version the version used to create the transaction
*
* @return true if the transaction passes validations, otherwise false
*/
bool add_tx(const transaction &tx, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version);
/**
* @brief takes a transaction with the given hash from the pool
*
* @param id the hash of the transaction
* @param tx return-by-reference the transaction taken
* @param blob_size return-by-reference the transaction's size
* @param fee the transaction fee
* @param relayed return-by-reference was transaction relayed to us by the network?
* @param do_not_relay return-by-reference is transaction not to be relayed to the network?
*
* @return true unless the transaction cannot be found in the pool
*/
bool take_tx(const crypto::hash &id, transaction &tx, size_t& blob_size, uint64_t& fee, bool &relayed, bool &do_not_relay);
/**
* @brief checks if the pool has a transaction with the given hash
*
* @param id the hash to look for
*
* @return true if the transaction is in the pool, otherwise false
*/
bool have_tx(const crypto::hash &id) const;
/**
* @brief action to take when notified of a block added to the blockchain
*
* Currently does nothing
*
* @param new_block_height the height of the blockchain after the change
* @param top_block_id the hash of the new top block
*
* @return true
*/
bool on_blockchain_inc(uint64_t new_block_height, const crypto::hash& top_block_id);
/**
* @brief action to take when notified of a block removed from the blockchain
*
* Currently does nothing
*
* @param new_block_height the height of the blockchain after the change
* @param top_block_id the hash of the new top block
*
* @return true
*/
bool on_blockchain_dec(uint64_t new_block_height, const crypto::hash& top_block_id);
/**
* @brief action to take periodically
*
* Currently checks transaction pool for stale ("stuck") transactions
*/
void on_idle();
/**
* @brief locks the transaction pool
*/
void lock() const;
/**
* @brief unlocks the transaction pool
*/
void unlock() const;
// load/store operations
/**
* @brief loads pool state (if any) from disk, and initializes pool
*
* @param config_folder folder name where pool state will be
*
* @return true
*/
bool init(const std::string& config_folder);
/**
* @brief attempts to save the transaction pool state to disk
*
* Currently fails (returns false) if the data directory from init()
* does not exist and cannot be created, but returns true even if
* saving to disk is unsuccessful.
*
* @return true in most cases (see above)
*/
bool deinit();
/**
* @brief Chooses transactions for a block to include
*
* @param bl return-by-reference the block to fill in with transactions
* @param median_size the current median block size
* @param already_generated_coins the current total number of coins "minted"
* @param total_size return-by-reference the total size of the new block
* @param fee return-by-reference the total of fees from the included transactions
* @param version hard fork version to use for consensus rules
*
* @return true
*/
bool fill_block_template(block &bl, size_t median_size, uint64_t already_generated_coins, size_t &total_size, uint64_t &fee, uint8_t version);
/**
* @brief get a list of all transactions in the pool
*
* @param txs return-by-reference the list of transactions
*/
void get_transactions(std::list<transaction>& txs) const;
/**
* @brief get information about all transactions and key images in the pool
*
* see documentation on tx_info and spent_key_image_info for more details
*
* @param tx_infos return-by-reference the transactions' information
* @param key_image_infos return-by-reference the spent key images' information
*
* @return true
*/
bool get_transactions_and_spent_keys_info(std::vector<tx_info>& tx_infos, std::vector<spent_key_image_info>& key_image_infos) const;
/**
* @brief get a specific transaction from the pool
*
* @param h the hash of the transaction to get
* @param tx return-by-reference the transaction requested
*
* @return true if the transaction is found, otherwise false
*/
bool get_transaction(const crypto::hash& h, transaction& tx) const;
/**
* @brief get a list of all relayable transactions and their hashes
*
* "relayable" in this case means:
* nonzero fee
* hasn't been relayed too recently
* isn't old enough that relaying it is considered harmful
*
* @param txs return-by-reference the transactions and their hashes
*
* @return true
*/
bool get_relayable_transactions(std::list<std::pair<crypto::hash, cryptonote::transaction>>& txs) const;
/**
* @brief tell the pool that certain transactions were just relayed
*
* @param txs the list of transactions (and their hashes)
*/
void set_relayed(const std::list<std::pair<crypto::hash, cryptonote::transaction>>& txs);
/**
* @brief get the total number of transactions in the pool
*
* @return the number of transactions in the pool
*/
size_t get_transactions_count() const;
/**
* @brief get a string containing human-readable pool information
*
* @param short_format whether to use a shortened format for the info
*
* @return the string
*/
std::string print_pool(bool short_format) const;
/**
* @brief remove transactions from the pool which are no longer valid
*
* With new versions of the currency, what conditions render a transaction
* invalid may change. This function clears those which were received
* before a version change and no longer conform to requirements.
*
* @param version the version the transactions must conform to
*
* @return the number of transactions removed
*/
size_t validate(uint8_t version);
#define CURRENT_MEMPOOL_ARCHIVE_VER 11
#define CURRENT_MEMPOOL_TX_DETAILS_ARCHIVE_VER 12
/**
* @brief serialize the transaction pool to/from disk
*
* If the archive version passed is older than the version compiled
* in, this function does nothing, as it cannot deserialize after a
* format change.
*
* @tparam archive_t the archive class
* @param a the archive to serialize to/from
* @param version the archive version
*/
template<class archive_t>
void serialize(archive_t & a, const unsigned int version)
{
if(version < CURRENT_MEMPOOL_ARCHIVE_VER )
return;
CRITICAL_REGION_LOCAL(m_transactions_lock);
a & m_transactions;
a & m_spent_key_images;
a & m_timed_out_transactions;
}
/**
* @brief information about a single transaction
*/
struct tx_details
{
transaction tx; //!< the transaction
size_t blob_size; //!< the transaction's size
uint64_t fee; //!< the transaction's fee amount
crypto::hash max_used_block_id; //!< the hash of the highest block referenced by an input
uint64_t max_used_block_height; //!< the height of the highest block referenced by an input
//! whether or not the transaction has been in a block before
/*! if the transaction was returned to the pool from the blockchain
* due to a reorg, then this will be true
*/
bool kept_by_block;
//! the highest block the transaction referenced when last checking it failed
/*! if verifying a transaction's inputs fails, it's possible this is due
* to a reorg since it was created (if it used recently created outputs
* as inputs).
*/
uint64_t last_failed_height;
//! the hash of the highest block the transaction referenced when last checking it failed
/*! if verifying a transaction's inputs fails, it's possible this is due
* to a reorg since it was created (if it used recently created outputs
* as inputs).
*/
crypto::hash last_failed_id;
time_t receive_time; //!< the time when the transaction entered the pool
time_t last_relayed_time; //!< the last time the transaction was relayed to the network
bool relayed; //!< whether or not the transaction has been relayed to the network
bool do_not_relay; //!< to avoid relay this transaction to the network
};
private:
/**
* @brief remove old transactions from the pool
*
* After a certain time, it is assumed that a transaction which has not
* yet been mined will likely not be mined. These transactions are removed
* from the pool to avoid buildup.
*
* @return true
*/
bool remove_stuck_transactions();
/**
* @brief check if a transaction in the pool has a given spent key image
*
* @param key_im the spent key image to look for
*
* @return true if the spent key image is present, otherwise false
*/
bool have_tx_keyimg_as_spent(const crypto::key_image& key_im) const;
/**
* @brief check if any spent key image in a transaction is in the pool
*
* Checks if any of the spent key images in a given transaction are present
* in any of the transactions in the transaction pool.
*
* @note see tx_pool::have_tx_keyimg_as_spent
*
* @param tx the transaction to check spent key images of
*
* @return true if any spent key images are present in the pool, otherwise false
*/
bool have_tx_keyimges_as_spent(const transaction& tx) const;
/**
* @brief forget a transaction's spent key images
*
* Spent key images are stored separately from transactions for
* convenience/speed, so this is part of the process of removing
* a transaction from the pool.
*
* @param tx the transaction
*
* @return false if any key images to be removed cannot be found, otherwise true
*/
bool remove_transaction_keyimages(const transaction& tx);
/**
* @brief check if any of a transaction's spent key images are present in a given set
*
* @param kic the set of key images to check against
* @param tx the transaction to check
*
* @return true if any key images present in the set, otherwise false
*/
static bool have_key_images(const std::unordered_set<crypto::key_image>& kic, const transaction& tx);
/**
* @brief append the key images from a transaction to the given set
*
* @param kic the set of key images to append to
* @param tx the transaction
*
* @return false if any append fails, otherwise true
*/
static bool append_key_images(std::unordered_set<crypto::key_image>& kic, const transaction& tx);
/**
* @brief check if a transaction is a valid candidate for inclusion in a block
*
* @param txd the transaction to check (and info about it)
*
* @return true if the transaction is good to go, otherwise false
*/
bool is_transaction_ready_to_go(tx_details& txd) const;
//! map transactions (and related info) by their hashes
typedef std::unordered_map<crypto::hash, tx_details > transactions_container;
//TODO: confirm the below comments and investigate whether or not this
// is the desired behavior
//! map key images to transactions which spent them
/*! this seems odd, but it seems that multiple transactions can exist
* in the pool which both have the same spent key. This would happen
* in the event of a reorg where someone creates a new/different
* transaction on the assumption that the original will not be in a
* block again.
*/
typedef std::unordered_map<crypto::key_image, std::unordered_set<crypto::hash> > key_images_container;
#if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
public:
#endif
mutable epee::critical_section m_transactions_lock; //!< lock for the pool
transactions_container m_transactions; //!< container for transactions in the pool
#if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
private:
#endif
//! container for spent key images from the transactions in the pool
key_images_container m_spent_key_images;
//TODO: this time should be a named constant somewhere, not hard-coded
//! interval on which to check for stale/"stuck" transactions
epee::math_helper::once_a_time_seconds<30> m_remove_stuck_tx_interval;
//TODO: look into doing this better
//!< container for transactions organized by fee per size and receive time
sorted_tx_container m_txs_by_fee_and_receive_time;
/**
* @brief get an iterator to a transaction in the sorted container
*
* @param id the hash of the transaction to look for
*
* @return an iterator, possibly to the end of the container if not found
*/
sorted_tx_container::iterator find_tx_in_sorted_container(const crypto::hash& id) const;
//! transactions which are unlikely to be included in blocks
/*! These transactions are kept in RAM in case they *are* included
* in a block eventually, but this container is not saved to disk.
*/
std::unordered_set<crypto::hash> m_timed_out_transactions;
std::string m_config_folder; //!< the folder to save state to
Blockchain& m_blockchain; //!< reference to the Blockchain object
};
}
namespace boost
{
namespace serialization
{
template<class archive_t>
void serialize(archive_t & ar, cryptonote::tx_memory_pool::tx_details& td, const unsigned int version)
{
ar & td.blob_size;
ar & td.fee;
ar & td.tx;
ar & td.max_used_block_height;
ar & td.max_used_block_id;
ar & td.last_failed_height;
ar & td.last_failed_id;
ar & td.receive_time;
ar & td.last_relayed_time;
ar & td.relayed;
if (version < 11)
return;
ar & td.kept_by_block;
if (version < 12)
return;
ar & td.do_not_relay;
}
}
}
BOOST_CLASS_VERSION(cryptonote::tx_memory_pool, CURRENT_MEMPOOL_ARCHIVE_VER)
BOOST_CLASS_VERSION(cryptonote::tx_memory_pool::tx_details, CURRENT_MEMPOOL_TX_DETAILS_ARCHIVE_VER)
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