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wownero/src/cryptonote_core/blockchain.h
Jeffrey Ryan c59e0096b6 verRctNonSemanticsSimpleCached: fix fragility
2023-03-17 18:46:34 -05:00

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// Copyright (c) 2014-2022, 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 <boost/asio/io_service.hpp>
#include <boost/function/function_fwd.hpp>
#if BOOST_VERSION >= 107400
#include <boost/serialization/library_version_type.hpp>
#endif
#include <boost/serialization/serialization.hpp>
#include <boost/serialization/version.hpp>
#include <boost/serialization/list.hpp>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/global_fun.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/member.hpp>
#include <atomic>
#include <functional>
#include <unordered_map>
#include <unordered_set>
#include "span.h"
#include "syncobj.h"
#include "string_tools.h"
#include "rolling_median.h"
#include "cryptonote_basic/cryptonote_basic.h"
#include "common/powerof.h"
#include "common/util.h"
#include "cryptonote_protocol/cryptonote_protocol_defs.h"
#include "rpc/core_rpc_server_commands_defs.h"
#include "cryptonote_basic/difficulty.h"
#include "cryptonote_tx_utils.h"
#include "tx_verification_utils.h"
#include "cryptonote_basic/verification_context.h"
#include "crypto/hash.h"
#include "checkpoints/checkpoints.h"
#include "cryptonote_basic/hardfork.h"
#include "blockchain_db/blockchain_db.h"
namespace tools { class Notify; }
namespace cryptonote
{
class tx_memory_pool;
struct test_options;
/** Declares ways in which the BlockchainDB backend should be told to sync
*
*/
enum blockchain_db_sync_mode
{
db_defaultsync, //!< user didn't specify, use db_async
db_sync, //!< handle syncing calls instead of the backing db, synchronously
db_async, //!< handle syncing calls instead of the backing db, asynchronously
db_nosync //!< Leave syncing up to the backing db (safest, but slowest because of disk I/O)
};
/**
* @brief Callback routine that returns checkpoints data for specific network type
*
* @param network network type
*
* @return checkpoints data, empty span if there ain't any checkpoints for specific network type
*/
typedef std::function<const epee::span<const unsigned char>(cryptonote::network_type network)> GetCheckpointsCallback;
typedef boost::function<void(uint64_t /* height */, epee::span<const block> /* blocks */)> BlockNotifyCallback;
typedef boost::function<void(uint8_t /* major_version */, uint64_t /* height */, const crypto::hash& /* prev_id */, const crypto::hash& /* seed_hash */, difficulty_type /* diff */, uint64_t /* median_weight */, uint64_t /* already_generated_coins */, const std::vector<tx_block_template_backlog_entry>& /* tx_backlog */)> MinerNotifyCallback;
/************************************************************************/
/* */
/************************************************************************/
class Blockchain
{
public:
/**
* @brief container for passing a block and metadata about it on the blockchain
*/
struct block_extended_info
{
block bl; //!< the block
uint64_t height; //!< the height of the block in the blockchain
uint64_t block_cumulative_weight; //!< the weight of the block
difficulty_type cumulative_difficulty; //!< the accumulated difficulty after that block
uint64_t already_generated_coins; //!< the total coins minted after that block
};
/**
* @brief Blockchain constructor
*
* @param tx_pool a reference to the transaction pool to be kept by the Blockchain
*/
Blockchain(tx_memory_pool& tx_pool);
/**
* @brief Blockchain destructor
*/
~Blockchain();
/**
* @brief Initialize the Blockchain state
*
* @param db a pointer to the backing store to use for the blockchain
* @param nettype network type
* @param offline true if running offline, else false
* @param test_options test parameters
* @param fixed_difficulty fixed difficulty for testing purposes; 0 means disabled
* @param get_checkpoints if set, will be called to get checkpoints data
*
* @return true on success, false if any initialization steps fail
*/
bool init(BlockchainDB* db, const network_type nettype = MAINNET, bool offline = false, const cryptonote::test_options *test_options = NULL, difficulty_type fixed_difficulty = 0, const GetCheckpointsCallback& get_checkpoints = nullptr);
/**
* @brief Initialize the Blockchain state
*
* @param db a pointer to the backing store to use for the blockchain
* @param hf a structure containing hardfork information
* @param nettype network type
* @param offline true if running offline, else false
*
* @return true on success, false if any initialization steps fail
*/
bool init(BlockchainDB* db, HardFork*& hf, const network_type nettype = MAINNET, bool offline = false);
/**
* @brief Uninitializes the blockchain state
*
* Saves to disk any state that needs to be maintained
*
* @return true on success, false if any uninitialization steps fail
*/
bool deinit();
/**
* @brief get a set of blockchain checkpoint hashes
*
* @return set of blockchain checkpoint hashes
*/
const checkpoints& get_checkpoints() const { return m_checkpoints; }
/**
* @brief assign a set of blockchain checkpoint hashes
*
* @param chk_pts the set of checkpoints to assign
*/
void set_checkpoints(checkpoints&& chk_pts) { m_checkpoints = chk_pts; }
/**
* @brief get blocks and transactions from blocks based on start height and count
*
* @param start_offset the height on the blockchain to start at
* @param count the number of blocks to get, if there are as many after start_offset
* @param blocks return-by-reference container to put result blocks in
* @param txs return-by-reference container to put result transactions in
*
* @return false if start_offset > blockchain height, else true
*/
bool get_blocks(uint64_t start_offset, size_t count, std::vector<std::pair<cryptonote::blobdata,block>>& blocks, std::vector<cryptonote::blobdata>& txs) const;
/**
* @brief get blocks from blocks based on start height and count
*
* @param start_offset the height on the blockchain to start at
* @param count the number of blocks to get, if there are as many after start_offset
* @param blocks return-by-reference container to put result blocks in
*
* @return false if start_offset > blockchain height, else true
*/
bool get_blocks(uint64_t start_offset, size_t count, std::vector<std::pair<cryptonote::blobdata,block>>& blocks) const;
/**
* @brief compiles a list of all blocks stored as alternative chains
*
* @param blocks return-by-reference container to put result blocks in
*
* @return true
*/
bool get_alternative_blocks(std::vector<block>& blocks) const;
/**
* @brief returns the number of alternative blocks stored
*
* @return the number of alternative blocks stored
*/
size_t get_alternative_blocks_count() const;
/**
* @brief gets a block's hash given a height
*
* @param height the height of the block
*
* @return the hash of the block at the requested height, or a zeroed hash if there is no such block
*/
crypto::hash get_block_id_by_height(uint64_t height) const;
/**
* @brief gets a block's hash given a height
*
* Used only by prepare_handle_incoming_blocks. Will look in the list of incoming blocks
* if the height is contained there.
*
* @param height the height of the block
*
* @return the hash of the block at the requested height, or a zeroed hash if there is no such block
*/
crypto::hash get_pending_block_id_by_height(uint64_t height) const;
/**
* @brief gets the block with a given hash
*
* @param h the hash to look for
* @param blk return-by-reference variable to put result block in
* @param orphan if non-NULL, will be set to true if not in the main chain, false otherwise
*
* @return true if the block was found, else false
*/
bool get_block_by_hash(const crypto::hash &h, block &blk, bool *orphan = NULL) const;
/**
* @brief performs some preprocessing on a group of incoming blocks to speed up verification
*
* @param blocks_entry a list of incoming blocks
* @param blocks the parsed blocks
*
* @return false on erroneous blocks, else true
*/
bool prepare_handle_incoming_blocks(const std::vector<block_complete_entry> &blocks_entry, std::vector<block> &blocks);
/**
* @brief incoming blocks post-processing, cleanup, and disk sync
*
* @param force_sync if true, and Blockchain is handling syncing to disk, always sync
*
* @return true
*/
bool cleanup_handle_incoming_blocks(bool force_sync = false);
/**
* @brief search the blockchain for a transaction by hash
*
* @param id the hash to search for
*
* @return true if the tx exists, else false
*/
bool have_tx(const crypto::hash &id) const;
/**
* @brief check if any key image in a transaction has already been spent
*
* @param tx the transaction to check
*
* @return true if any key image is already spent in the blockchain, else false
*/
bool have_tx_keyimges_as_spent(const transaction &tx) const;
/**
* @brief check if a key image is already spent on the blockchain
*
* Whenever a transaction output is used as an input for another transaction
* (a true input, not just one of a mixing set), a key image is generated
* and stored in the transaction in order to prevent double spending. If
* this key image is seen again, the transaction using it is rejected.
*
* @param key_im the key image to search for
*
* @return true if the key image is already spent in the blockchain, else false
*/
bool have_tx_keyimg_as_spent(const crypto::key_image &key_im) const;
/**
* @brief get the current height of the blockchain
*
* @return the height
*/
uint64_t get_current_blockchain_height() const;
/**
* @brief get the hash of the most recent block on the blockchain
*
* @return the hash
*/
crypto::hash get_tail_id() const;
/**
* @brief get the height and hash of the most recent block on the blockchain
*
* @param height return-by-reference variable to store the height in
*
* @return the hash
*/
crypto::hash get_tail_id(uint64_t& height) const;
/**
* @brief returns the difficulty target the next block to be added must meet
*
* @return the target
*/
difficulty_type get_difficulty_for_next_block();
/**
* @brief check currently stored difficulties against difficulty checkpoints
*
* @return {flag, height} flag: true if all difficulty checkpoints pass, height: the last checkpoint height before the difficulty drift bug starts
*/
std::pair<bool, uint64_t> check_difficulty_checkpoints() const;
/**
* @brief recalculate difficulties for blocks after the last difficulty checkpoints to circumvent the annoying 'difficulty drift' bug
*
* @param start_height: if omitted, starts recalculation from the last difficulty checkpoint
*
* @return number of blocks whose difficulties got corrected
*/
size_t recalculate_difficulties(boost::optional<uint64_t> start_height = boost::none);
/**
* @brief adds a block to the blockchain
*
* Adds a new block to the blockchain. If the block's parent is not the
* current top of the blockchain, the block may be added to an alternate
* chain. If the block does not belong, is already in the blockchain
* or an alternate chain, or is invalid, return false.
*
* @param bl_ the block to be added
* @param bvc metadata about the block addition's success/failure
*
* @return true on successful addition to the blockchain, else false
*/
bool add_new_block(const block& bl_, block_verification_context& bvc);
/**
* @brief clears the blockchain and starts a new one
*
* @param b the first block in the new chain (the genesis block)
*
* @return true on success, else false
*/
bool reset_and_set_genesis_block(const block& b);
/**
* @brief creates a new block to mine against
*
* @param b return-by-reference block to be filled in
* @param from_block optional block hash to start mining from (main chain tip if NULL)
* @param miner_address address new coins for the block will go to
* @param di return-by-reference tells the miner what the difficulty target is
* @param height return-by-reference tells the miner what height it's mining against
* @param expected_reward return-by-reference the total reward awarded to the miner finding this block, including transaction fees
* @param ex_nonce extra data to be added to the miner transaction's extra
*
* @return true if block template filled in successfully, else false
*/
bool create_block_template(block& b, const account_public_address& miner_address, difficulty_type& di, uint64_t& height, uint64_t& expected_reward, const blobdata& ex_nonce, uint64_t &seed_height, crypto::hash &seed_hash);
bool create_block_template(block& b, const crypto::hash *from_block, const account_public_address& miner_address, difficulty_type& di, uint64_t& height, uint64_t& expected_reward, const blobdata& ex_nonce, uint64_t &seed_height, crypto::hash &seed_hash);
/**
* @brief gets data required to create a block template and start mining on it
*
* @param major_version current hardfork version
* @param height current blockchain height
* @param prev_id hash of the top block
* @param seed_hash seed hash used for RandomX initialization
* @param difficulty current mining difficulty
* @param median_weight current median block weight
* @param already_generated_coins current emission
* @param tx_backlog transactions in mempool ready to be mined
*
* @return true if block template filled in successfully, else false
*/
bool get_miner_data(uint8_t& major_version, uint64_t& height, crypto::hash& prev_id, crypto::hash& seed_hash, difficulty_type& difficulty, uint64_t& median_weight, uint64_t& already_generated_coins, std::vector<tx_block_template_backlog_entry>& tx_backlog);
/**
* @brief checks if a block is known about with a given hash
*
* This function checks the main chain, alternate chains, and invalid blocks
* for a block with the given hash
*
* @param id the hash to search for
* @param where the type of block, if non NULL
*
* @return true if the block is known, else false
*/
bool have_block_unlocked(const crypto::hash& id, int *where = NULL) const;
bool have_block(const crypto::hash& id, int *where = NULL) const;
/**
* @brief gets the total number of transactions on the main chain
*
* @return the number of transactions on the main chain
*/
size_t get_total_transactions() const;
/**
* @brief gets the hashes for a subset of the blockchain
*
* puts into list <ids> a list of hashes representing certain blocks
* from the blockchain in reverse chronological order
*
* the blocks chosen, at the time of this writing, are:
* the most recent 11
* powers of 2 less recent from there, so 13, 17, 25, etc...
*
* @param ids return-by-reference list to put the resulting hashes in
*
* @return true
*/
bool get_short_chain_history(std::list<crypto::hash>& ids) const;
/**
* @brief get recent block hashes for a foreign chain
*
* Find the split point between us and foreign blockchain and return
* (by reference) the most recent common block hash along with up to
* BLOCKS_IDS_SYNCHRONIZING_DEFAULT_COUNT additional (more recent) hashes.
*
* @param qblock_ids the foreign chain's "short history" (see get_short_chain_history)
* @param hashes the hashes to be returned, return-by-reference
* @param weights the block weights to be returned, return-by-reference
* @param start_height the start height, return-by-reference
* @param current_height the current blockchain height, return-by-reference
* @param clip_pruned whether to constrain results to unpruned data
*
* @return true if a block found in common, else false
*/
bool find_blockchain_supplement(const std::list<crypto::hash>& qblock_ids, std::vector<crypto::hash>& hashes, std::vector<uint64_t>* weights, uint64_t& start_height, uint64_t& current_height, bool clip_pruned) const;
/**
* @brief get recent block hashes for a foreign chain
*
* Find the split point between us and foreign blockchain and return
* (by reference) the most recent common block hash along with up to
* BLOCKS_IDS_SYNCHRONIZING_DEFAULT_COUNT additional (more recent) hashes.
*
* @param qblock_ids the foreign chain's "short history" (see get_short_chain_history)
* @param clip_pruned clip pruned blocks if true, include them otherwise
* @param resp return-by-reference the split height and subsequent blocks' hashes
*
* @return true if a block found in common, else false
*/
bool find_blockchain_supplement(const std::list<crypto::hash>& qblock_ids, bool clip_pruned, NOTIFY_RESPONSE_CHAIN_ENTRY::request& resp) const;
/**
* @brief find the most recent common point between ours and a foreign chain
*
* This function takes a list of block hashes from another node
* on the network to find where the split point is between us and them.
* This is used to see what to send another node that needs to sync.
*
* @param qblock_ids the foreign chain's "short history" (see get_short_chain_history)
* @param starter_offset return-by-reference the most recent common block's height
*
* @return true if a block found in common, else false
*/
bool find_blockchain_supplement(const std::list<crypto::hash>& qblock_ids, uint64_t& starter_offset) const;
/**
* @brief get recent blocks for a foreign chain
*
* This function gets recent blocks relative to a foreign chain, starting either at
* a requested height or whatever height is the most recent ours and the foreign
* chain have in common.
*
* @param req_start_block if non-zero, specifies a start point (otherwise find most recent commonality)
* @param qblock_ids the foreign chain's "short history" (see get_short_chain_history)
* @param blocks return-by-reference the blocks and their transactions
* @param total_height return-by-reference our current blockchain height
* @param start_height return-by-reference the height of the first block returned
* @param pruned whether to return full or pruned tx blobs
* @param max_block_count the max number of blocks to get
* @param max_tx_count the max number of txes to get (it can get overshot by the last block's number of txes minus 1)
*
* @return true if a block found in common or req_start_block specified, else false
*/
bool find_blockchain_supplement(const uint64_t req_start_block, const std::list<crypto::hash>& qblock_ids, std::vector<std::pair<std::pair<cryptonote::blobdata, crypto::hash>, std::vector<std::pair<crypto::hash, cryptonote::blobdata> > > >& blocks, uint64_t& total_height, uint64_t& start_height, bool pruned, bool get_miner_tx_hash, size_t max_block_count, size_t max_tx_count) const;
/**
* @brief retrieves a set of blocks and their transactions, and possibly other transactions
*
* the request object encapsulates a list of block hashes and a (possibly empty) list of
* transaction hashes. for each block hash, the block is fetched along with all of that
* block's transactions. Any transactions requested separately are fetched afterwards.
*
* @param arg the request
* @param rsp return-by-reference the response to fill in
*
* @return true unless any blocks or transactions are missing
*/
bool handle_get_objects(NOTIFY_REQUEST_GET_OBJECTS::request& arg, NOTIFY_RESPONSE_GET_OBJECTS::request& rsp);
/**
* @brief get number of outputs of an amount past the minimum spendable age
*
* @param amount the output amount
*
* @return the number of mature outputs
*/
uint64_t get_num_mature_outputs(uint64_t amount) const;
/**
* @brief get the public key for an output
*
* @param amount the output amount
* @param global_index the output amount-global index
*
* @return the public key
*/
crypto::public_key get_output_key(uint64_t amount, uint64_t global_index) const;
/**
* @brief gets specific outputs to mix with
*
* This function takes an RPC request for outputs to mix with
* and creates an RPC response with the resultant output indices.
*
* Outputs to mix with are specified in the request.
*
* @param req the outputs to return
* @param res return-by-reference the resultant output indices and keys
*
* @return true
*/
bool get_outs(const COMMAND_RPC_GET_OUTPUTS_BIN::request& req, COMMAND_RPC_GET_OUTPUTS_BIN::response& res) const;
/**
* @brief gets an output's key and unlocked state
*
* @param amount in - the output amount
* @param index in - the output global amount index
* @param mask out - the output's RingCT mask
* @param key out - the output's key
* @param unlocked out - the output's unlocked state
*/
void get_output_key_mask_unlocked(const uint64_t& amount, const uint64_t& index, crypto::public_key& key, rct::key& mask, bool& unlocked) const;
/**
* @brief gets per block distribution of outputs of a given amount
*
* @param amount the amount to get a ditribution for
* @param from_height the height before which we do not care about the data
* @param to_height the height after which we do not care about the data
* @param return-by-reference start_height the height of the first rct output
* @param return-by-reference distribution the start offset of the first rct output in this block (same as previous if none)
* @param return-by-reference base how many outputs of that amount are before the stated distribution
*/
bool get_output_distribution(uint64_t amount, uint64_t from_height, uint64_t to_height, uint64_t &start_height, std::vector<uint64_t> &distribution, uint64_t &base) const;
/**
* @brief gets the global indices for outputs from a given transaction
*
* This function gets the global indices for all outputs belonging
* to a specific transaction.
*
* @param tx_id the hash of the transaction to fetch indices for
* @param indexs return-by-reference the global indices for the transaction's outputs
* @param n_txes how many txes in a row to get results for
*
* @return false if the transaction does not exist, or if no indices are found, otherwise true
*/
bool get_tx_outputs_gindexs(const crypto::hash& tx_id, std::vector<uint64_t>& indexs) const;
bool get_tx_outputs_gindexs(const crypto::hash& tx_id, size_t n_txes, std::vector<std::vector<uint64_t>>& indexs) const;
/**
* @brief stores the blockchain
*
* If Blockchain is handling storing of the blockchain (rather than BlockchainDB),
* this initiates a blockchain save.
*
* @return true unless saving the blockchain fails
*/
bool store_blockchain();
/**
* @brief expands v2 transaction data from blockchain
*
* RingCT transactions do not transmit some of their data if it
* can be reconstituted by the receiver. This function expands
* that implicit data.
*/
static bool expand_transaction_2(transaction &tx, const crypto::hash &tx_prefix_hash, const std::vector<std::vector<rct::ctkey>> &pubkeys);
/**
* @brief validates a transaction's inputs
*
* validates a transaction's inputs as correctly used and not previously
* spent. also returns the hash and height of the most recent block
* which contains an output that was used as an input to the transaction.
* The transaction's rct signatures, if any, are expanded.
*
* @param tx the transaction to validate
* @param pmax_used_block_height return-by-reference block height of most recent input
* @param max_used_block_id return-by-reference block hash of most recent input
* @param tvc returned information about tx verification
* @param kept_by_block whether or not the transaction is from a previously-verified block
*
* @return false if any input is invalid, otherwise true
*/
bool check_tx_inputs(transaction& tx, uint64_t& pmax_used_block_height, crypto::hash& max_used_block_id, tx_verification_context &tvc, bool kept_by_block = false) const;
/**
* @brief get fee quantization mask
*
* The dynamic fee may be quantized, to mask out the last decimal places
*
* @return the fee quantized mask
*/
static uint64_t get_fee_quantization_mask()
{
return tools::PowerOf<10, CRYPTONOTE_DISPLAY_DECIMAL_POINT - PER_KB_FEE_QUANTIZATION_DECIMALS>::Value;
}
/**
* @brief get dynamic per kB or byte fee for a given block weight
*
* The dynamic fee is based on the block weight in a past window, and
* the current block reward. It is expressed by kB before v8, and
* per byte from v8.
*
* @param block_reward the current block reward
* @param median_block_weight the median block weight in the past window
* @param version hard fork version for rules and constants to use
*
* @return the fee
*/
static uint64_t get_dynamic_base_fee(uint64_t block_reward, size_t median_block_weight, uint8_t version);
/**
* @brief get dynamic per kB or byte fee estimate for the next few blocks
*
* The dynamic fee is based on the block weight in a past window, and
* the current block reward. It is expressed by kB before v8, and
* per byte from v8.
* This function calculates an estimate for a dynamic fee which will be
* valid for the next grace_blocks
*
* @param grace_blocks number of blocks we want the fee to be valid for
*
* @return the fee estimate
*/
uint64_t get_dynamic_base_fee_estimate(uint64_t grace_blocks) const;
void get_dynamic_base_fee_estimate_2021_scaling(uint64_t grace_blocks, uint64_t base_reward, uint64_t Mnw, uint64_t Mlw, std::vector<uint64_t> &fees) const;
/**
* @brief get four levels of dynamic per byte fee estimate for the next few blocks
*
* The dynamic fee is based on the block weight in a past window, and
* the current block reward. It is expressed per byte, and is based on
* https://github.com/ArticMine/Monero-Documents/blob/master/MoneroScaling2021-02.pdf
* This function calculates an estimate for a dynamic fee which will be
* valid for the next grace_blocks
*
* @param grace_blocks number of blocks we want the fee to be valid for
*
* @return the fee estimates (4 of them)
*/
void get_dynamic_base_fee_estimate_2021_scaling(uint64_t grace_blocks, std::vector<uint64_t> &fees) const;
/**
* @brief validate a transaction's fee
*
* This function validates the fee is enough for the transaction.
* This is based on the weight of the transaction, and, after a
* height threshold, on the average weight of transaction in a past window
*
* @param tx_weight the transaction weight
* @param fee the fee
*
* @return true if the fee is enough, false otherwise
*/
bool check_fee(size_t tx_weight, uint64_t fee) const;
/**
* @brief check that a transaction's outputs conform to current standards
*
* This function checks, for example at the time of this writing, that
* each output is of the form a * 10^b (phrased differently, that if
* written out would have only one non-zero digit in base 10).
*
* @param tx the transaction to check the outputs of
* @param tvc returned info about tx verification
*
* @return false if any outputs do not conform, otherwise true
*/
bool check_tx_outputs(const transaction& tx, tx_verification_context &tvc) const;
/**
* @brief gets the block weight limit based on recent blocks
*
* @return the limit
*/
uint64_t get_current_cumulative_block_weight_limit() const;
/**
* @brief gets the long term block weight for a new block
*
* @return the long term block weight
*/
uint64_t get_next_long_term_block_weight(uint64_t block_weight) const;
/**
* @brief gets the block weight median based on recent blocks (same window as for the limit)
*
* @return the median
*/
uint64_t get_current_cumulative_block_weight_median() const;
/**
* @brief gets the difficulty of the block with a given height
*
* @param i the height
*
* @return the difficulty
*/
difficulty_type block_difficulty(uint64_t i) const;
/**
* @brief gets blocks based on a list of block hashes
*
* @tparam t_ids_container a standard-iterable container
* @tparam t_blocks_container a standard-iterable container
* @tparam t_missed_container a standard-iterable container
* @param block_ids a container of block hashes for which to get the corresponding blocks
* @param blocks return-by-reference a container to store result blocks in
* @param missed_bs return-by-reference a container to store missed blocks in
*
* @return false if an unexpected exception occurs, else true
*/
template<class t_ids_container, class t_blocks_container, class t_missed_container>
bool get_blocks(const t_ids_container& block_ids, t_blocks_container& blocks, t_missed_container& missed_bs) const;
/**
* @brief gets transactions based on a list of transaction hashes
*
* @tparam t_ids_container a standard-iterable container
* @tparam t_tx_container a standard-iterable container
* @tparam t_missed_container a standard-iterable container
* @param txs_ids a container of hashes for which to get the corresponding transactions
* @param txs return-by-reference a container to store result transactions in
* @param missed_txs return-by-reference a container to store missed transactions in
* @param pruned whether to return full or pruned blobs
*
* @return false if an unexpected exception occurs, else true
*/
bool get_transactions_blobs(const std::vector<crypto::hash>& txs_ids, std::vector<cryptonote::blobdata>& txs, std::vector<crypto::hash>& missed_txs, bool pruned = false) const;
bool get_transactions_blobs(const std::vector<crypto::hash>& txs_ids, std::vector<tx_blob_entry>& txs, std::vector<crypto::hash>& missed_txs, bool pruned = false) const;
template<class t_ids_container, class t_tx_container, class t_missed_container>
bool get_split_transactions_blobs(const t_ids_container& txs_ids, t_tx_container& txs, t_missed_container& missed_txs) const;
template<class t_ids_container, class t_tx_container, class t_missed_container>
bool get_transactions(const t_ids_container& txs_ids, t_tx_container& txs, t_missed_container& missed_txs, bool pruned = false) const;
//debug functions
/**
* @brief check the blockchain against a set of checkpoints
*
* If a block fails a checkpoint and enforce is enabled, the blockchain
* will be rolled back to two blocks prior to that block. If enforce
* is disabled, as is currently the default case with DNS-based checkpoints,
* an error will be printed to the user but no other action will be taken.
*
* @param points the checkpoints to check against
* @param enforce whether or not to take action on failure
*/
void check_against_checkpoints(const checkpoints& points, bool enforce);
/**
* @brief configure whether or not to enforce DNS-based checkpoints
*
* @param enforce the new enforcement setting
*/
void set_enforce_dns_checkpoints(bool enforce);
/**
* @brief loads new checkpoints from a file and optionally from DNS
*
* @param file_path the path of the file to look for and load checkpoints from
* @param check_dns whether or not to check for new DNS-based checkpoints
*
* @return false if any enforced checkpoint type fails to load, otherwise true
*/
bool update_checkpoints(const std::string& file_path, bool check_dns);
// user options, must be called before calling init()
/**
* @brief sets various performance options
*
* @param maxthreads max number of threads when preparing blocks for addition
* @param sync_on_blocks whether to sync based on blocks or bytes
* @param sync_threshold number of blocks/bytes to cache before syncing to database
* @param sync_mode the ::blockchain_db_sync_mode to use
* @param fast_sync sync using built-in block hashes as trusted
*/
void set_user_options(uint64_t maxthreads, bool sync_on_blocks, uint64_t sync_threshold,
blockchain_db_sync_mode sync_mode, bool fast_sync);
/**
* @brief sets a block notify object to call for every new block
*
* @param notify the notify object to call at every new block
*/
void add_block_notify(BlockNotifyCallback&& notify);
/**
* @brief sets a miner notify object to call for every new block
*
* @param notify the notify object to call at every new block
*/
void add_miner_notify(MinerNotifyCallback&& notify);
/**
* @brief sets a reorg notify object to call for every reorg
*
* @param notify the notify object to call at every reorg
*/
void set_reorg_notify(const std::shared_ptr<tools::Notify> &notify) { m_reorg_notify = notify; }
/**
* @brief Put DB in safe sync mode
*/
void safesyncmode(const bool onoff);
/**
* @brief set whether or not to show/print time statistics
*
* @param stats the new time stats setting
*/
void set_show_time_stats(bool stats) { m_show_time_stats = stats; }
/**
* @brief gets the hardfork voting state object
*
* @return the HardFork object
*/
HardFork::State get_hard_fork_state() const;
/**
* @brief gets the current hardfork version in use/voted for
*
* @return the version
*/
uint8_t get_current_hard_fork_version() const { return m_hardfork->get_current_version(); }
/**
* @brief returns the newest hardfork version known to the blockchain
*
* @return the version
*/
uint8_t get_ideal_hard_fork_version() const { return m_hardfork->get_ideal_version(); }
/**
* @brief returns the next hardfork version
*
* @return the version
*/
uint8_t get_next_hard_fork_version() const { return m_hardfork->get_next_version(); }
/**
* @brief returns the newest hardfork version voted to be enabled
* as of a certain height
*
* @param height the height for which to check version info
*
* @return the version
*/
uint8_t get_ideal_hard_fork_version(uint64_t height) const { return m_hardfork->get_ideal_version(height); }
/**
* @brief returns the actual hardfork version for a given block height
*
* @param height the height for which to check version info
*
* @return the version
*/
uint8_t get_hard_fork_version(uint64_t height) const { return m_hardfork->get(height); }
/**
* @brief returns the earliest block a given version may activate
*
* @return the height
*/
uint64_t get_earliest_ideal_height_for_version(uint8_t version) const { return m_hardfork->get_earliest_ideal_height_for_version(version); }
/**
* @brief returns info for all known hard forks
*
* @return the hardforks
*/
const std::vector<hardfork_t>& get_hardforks() const { return m_hardfork->get_hardforks(); }
/**
* @brief get information about hardfork voting for a version
*
* @param version the version in question
* @param window the size of the voting window
* @param votes the number of votes to enable <version>
* @param threshold the number of votes required to enable <version>
* @param earliest_height the earliest height at which <version> is allowed
* @param voting which version this node is voting for/using
*
* @return whether the version queried is enabled
*/
bool get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
/**
* @brief get difficulty target based on chain and hardfork version
*
* @return difficulty target
*/
uint64_t get_difficulty_target() const;
/**
* @brief remove transactions from the transaction pool (if present)
*
* @param txids a list of hashes of transactions to be removed
*
* @return false if any removals fail, otherwise true
*/
bool flush_txes_from_pool(const std::vector<crypto::hash> &txids);
/**
* @brief return a histogram of outputs on the blockchain
*
* @param amounts optional set of amounts to lookup
* @param unlocked whether to restrict instances to unlocked ones
* @param recent_cutoff timestamp to consider outputs as recent
* @param min_count return only amounts with at least that many instances
*
* @return a set of amount/instances
*/
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count = 0) const;
/**
* @brief perform a check on all key images in the blockchain
*
* @param std::function the check to perform, pass/fail
*
* @return false if any key image fails the check, otherwise true
*/
bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const;
/**
* @brief perform a check on all blocks in the blockchain in the given range
*
* @param h1 the start height
* @param h2 the end height
* @param std::function the check to perform, pass/fail
*
* @return false if any block fails the check, otherwise true
*/
bool for_blocks_range(const uint64_t& h1, const uint64_t& h2, std::function<bool(uint64_t, const crypto::hash&, const block&)>) const;
/**
* @brief perform a check on all transactions in the blockchain
*
* @param std::function the check to perform, pass/fail
* @param bool pruned whether to return pruned txes only
*
* @return false if any transaction fails the check, otherwise true
*/
bool for_all_transactions(std::function<bool(const crypto::hash&, const cryptonote::transaction&)>, bool pruned) const;
/**
* @brief perform a check on all outputs in the blockchain
*
* @param std::function the check to perform, pass/fail
*
* @return false if any output fails the check, otherwise true
*/
bool for_all_outputs(std::function<bool(uint64_t amount, const crypto::hash &tx_hash, uint64_t height, size_t tx_idx)>) const;
/**
* @brief perform a check on all outputs of a given amount in the blockchain
*
* @param amount the amount to iterate through
* @param std::function the check to perform, pass/fail
*
* @return false if any output fails the check, otherwise true
*/
bool for_all_outputs(uint64_t amount, std::function<bool(uint64_t height)>) const;
/**
* @brief get a reference to the BlockchainDB in use by Blockchain
*
* @return a reference to the BlockchainDB instance
*/
const BlockchainDB& get_db() const
{
return *m_db;
}
/**
* @brief get a reference to the BlockchainDB in use by Blockchain
*
* @return a reference to the BlockchainDB instance
*/
BlockchainDB& get_db()
{
return *m_db;
}
/**
* @brief get a number of outputs of a specific amount
*
* @param amount the amount
* @param offsets the indices (indexed to the amount) of the outputs
* @param outputs return-by-reference the outputs collected
*/
void output_scan_worker(const uint64_t amount,const std::vector<uint64_t> &offsets,
std::vector<output_data_t> &outputs) const;
/**
* @brief computes the "short" and "long" hashes for a set of blocks
*
* @param height the height of the first block
* @param blocks the blocks to be hashed
* @param map return-by-reference the hashes for each block
*/
void block_longhash_worker(uint64_t height, const epee::span<const block> &blocks,
std::unordered_map<crypto::hash, crypto::hash> &map) const;
/**
* @brief returns a set of known alternate chains
*
* @return a vector of chains
*/
std::vector<std::pair<block_extended_info,std::vector<crypto::hash>>> get_alternative_chains() const;
void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const txpool_tx_meta_t &meta);
void update_txpool_tx(const crypto::hash &txid, const txpool_tx_meta_t &meta);
void remove_txpool_tx(const crypto::hash &txid);
uint64_t get_txpool_tx_count(bool include_sensitive = false) const;
bool get_txpool_tx_meta(const crypto::hash& txid, txpool_tx_meta_t &meta) const;
bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd, relay_category tx_category) const;
cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid, relay_category tx_category) const;
bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const txpool_tx_meta_t&, const cryptonote::blobdata_ref*)>, bool include_blob = false, relay_category tx_category = relay_category::broadcasted) const;
bool txpool_tx_matches_category(const crypto::hash& tx_hash, relay_category category);
bool is_within_compiled_block_hash_area() const { return is_within_compiled_block_hash_area(m_db->height()); }
uint64_t prevalidate_block_hashes(uint64_t height, const std::vector<crypto::hash> &hashes, const std::vector<uint64_t> &weights);
uint32_t get_blockchain_pruning_seed() const { return m_db->get_blockchain_pruning_seed(); }
bool prune_blockchain(uint32_t pruning_seed = 0);
bool update_blockchain_pruning();
bool check_blockchain_pruning();
void lock();
void unlock();
void cancel();
/**
* @brief called when we see a tx originating from a block
*
* Used for handling txes from historical blocks in a fast way
*/
void on_new_tx_from_block(const cryptonote::transaction &tx);
/**
* @brief returns the timestamps of the last N blocks
*/
std::vector<time_t> get_last_block_timestamps(unsigned int blocks) const;
/**
* @brief removes blocks from the top of the blockchain
*
* @param nblocks number of blocks to be removed
*/
void pop_blocks(uint64_t nblocks);
/**
* @brief checks whether a given block height is included in the precompiled block hash area
*
* @param height the height to check for
*/
bool is_within_compiled_block_hash_area(uint64_t height) const;
/**
* @brief checks whether we have known weights for the given block heights
*
* @param height the start height to check for
* @param nblocks how many blocks to check from that height
*/
bool has_block_weights(uint64_t height, uint64_t nblocks) const;
/**
* @brief flush the invalid blocks set
*/
void flush_invalid_blocks();
/**
* @brief get the "adjusted time"
*
* Computes the median timestamp of the previous 60 blocks, projects it
* onto the current block to get an 'adjusted median time' which approximates
* what the current block's timestamp should be. Also projects the previous
* block's timestamp to estimate the current block's timestamp.
*
* Returns the minimum of the two projections, or the current local time on
* the machine if less than 60 blocks are available.
*
* @return current time approximated from chain data
*/
uint64_t get_adjusted_time(uint64_t height) const;
#ifndef IN_UNIT_TESTS
private:
#endif
// TODO: evaluate whether or not each of these typedefs are left over from blockchain_storage
typedef std::unordered_set<crypto::key_image> key_images_container;
typedef std::vector<block_extended_info> blocks_container;
typedef std::unordered_map<crypto::hash, block_extended_info> blocks_ext_by_hash;
BlockchainDB* m_db;
tx_memory_pool& m_tx_pool;
mutable epee::critical_section m_blockchain_lock; // TODO: add here reader/writer lock
// main chain
size_t m_current_block_cumul_weight_limit;
size_t m_current_block_cumul_weight_median;
// metadata containers
std::unordered_map<crypto::hash, std::unordered_map<crypto::key_image, std::vector<output_data_t>>> m_scan_table;
std::unordered_map<crypto::hash, crypto::hash> m_blocks_longhash_table;
// Keccak hashes for each block and for fast pow checking
std::vector<std::pair<crypto::hash, crypto::hash>> m_blocks_hash_of_hashes;
std::vector<std::pair<crypto::hash, uint64_t>> m_blocks_hash_check;
std::vector<crypto::hash> m_blocks_txs_check;
blockchain_db_sync_mode m_db_sync_mode;
bool m_fast_sync;
bool m_show_time_stats;
bool m_db_default_sync;
bool m_db_sync_on_blocks;
uint64_t m_db_sync_threshold;
uint64_t m_max_prepare_blocks_threads;
uint64_t m_fake_pow_calc_time;
uint64_t m_fake_scan_time;
uint64_t m_sync_counter;
uint64_t m_bytes_to_sync;
std::vector<uint64_t> m_timestamps;
std::vector<difficulty_type> m_difficulties;
uint64_t m_timestamps_and_difficulties_height;
bool m_reset_timestamps_and_difficulties_height;
uint64_t m_long_term_block_weights_window;
uint64_t m_long_term_effective_median_block_weight;
mutable crypto::hash m_long_term_block_weights_cache_tip_hash;
mutable epee::misc_utils::rolling_median_t<uint64_t> m_long_term_block_weights_cache_rolling_median;
epee::critical_section m_difficulty_lock;
crypto::hash m_difficulty_for_next_block_top_hash;
difficulty_type m_difficulty_for_next_block;
boost::asio::io_service m_async_service;
boost::thread_group m_async_pool;
std::unique_ptr<boost::asio::io_service::work> m_async_work_idle;
// some invalid blocks
blocks_ext_by_hash m_invalid_blocks; // crypto::hash -> block_extended_info
checkpoints m_checkpoints;
bool m_enforce_dns_checkpoints;
HardFork *m_hardfork;
network_type m_nettype;
bool m_offline;
difficulty_type m_fixed_difficulty;
std::atomic<bool> m_cancel;
// block template cache
block m_btc;
account_public_address m_btc_address;
blobdata m_btc_nonce;
difficulty_type m_btc_difficulty;
uint64_t m_btc_height;
uint64_t m_btc_pool_cookie;
uint64_t m_btc_expected_reward;
crypto::hash m_btc_seed_hash;
uint64_t m_btc_seed_height;
bool m_btc_valid;
bool m_batch_success;
/* `boost::function` is used because the implementation never allocates if
the callable object has a single `std::shared_ptr` or `std::weap_ptr`
internally. Whereas, the libstdc++ `std::function` will allocate. */
std::vector<BlockNotifyCallback> m_block_notifiers;
std::vector<MinerNotifyCallback> m_miner_notifiers;
std::shared_ptr<tools::Notify> m_reorg_notify;
// for prepare_handle_incoming_blocks
uint64_t m_prepare_height;
uint64_t m_prepare_nblocks;
std::vector<block> *m_prepare_blocks;
// cache for verifying transaction RCT non semantics
mutable rct_ver_cache_t m_rct_ver_cache;
/**
* @brief collects the keys for all outputs being "spent" as an input
*
* This function makes sure that each "input" in an input (mixins) exists
* and collects the public key for each from the transaction it was included in
* via the visitor passed to it.
*
* If pmax_related_block_height is not NULL, its value is set to the height
* of the most recent block which contains an output used in the input set
*
* @tparam visitor_t a class encapsulating tx is unlocked and collect tx key
* @param tx_in_to_key a transaction input instance
* @param vis an instance of the visitor to use
* @param tx_prefix_hash the hash of the associated transaction_prefix
* @param pmax_related_block_height return-by-pointer the height of the most recent block in the input set
* @param tx_version version of the tx, if > 1 we also get commitments
*
* @return false if any keys are not found or any inputs are not unlocked, otherwise true
*/
template<class visitor_t>
inline bool scan_outputkeys_for_indexes(size_t tx_version, const txin_to_key& tx_in_to_key, visitor_t &vis, const crypto::hash &tx_prefix_hash, uint64_t* pmax_related_block_height = NULL) const;
/**
* @brief collect output public keys of a transaction input set
*
* This function locates all outputs associated with a given input set (mixins)
* and validates that they exist and are usable
* (unlocked, unspent is checked elsewhere).
*
* If pmax_related_block_height is not NULL, its value is set to the height
* of the most recent block which contains an output used in the input set
*
* @param tx_version the transaction version
* @param txin the transaction input
* @param tx_prefix_hash the transaction prefix hash, for caching organization
* @param sig the input signature
* @param output_keys return-by-reference the public keys of the outputs in the input set
* @param rct_signatures the ringCT signatures, which are only valid if tx version > 1
* @param pmax_related_block_height return-by-pointer the height of the most recent block in the input set
* @param hf_version the consensus rules version to use
*
* @return false if any output is not yet unlocked, or is missing, otherwise true
*/
bool check_tx_input(size_t tx_version,const txin_to_key& txin, const crypto::hash& tx_prefix_hash, const std::vector<crypto::signature>& sig, const rct::rctSig &rct_signatures, std::vector<rct::ctkey> &output_keys, uint64_t* pmax_related_block_height, uint8_t hf_version) const;
/**
* @brief validate a transaction's inputs and their keys
*
* This function validates transaction inputs and their keys. Previously
* it also performed double spend checking, but that has been moved to its
* own function.
* The transaction's rct signatures, if any, are expanded.
*
* If pmax_related_block_height is not NULL, its value is set to the height
* of the most recent block which contains an output used in any input set
*
* Currently this function calls ring signature validation for each
* transaction.
*
* @param tx the transaction to validate
* @param tvc returned information about tx verification
* @param pmax_related_block_height return-by-pointer the height of the most recent block in the input set
*
* @return false if any validation step fails, otherwise true
*/
bool check_tx_inputs(transaction& tx, tx_verification_context &tvc, uint64_t* pmax_used_block_height = NULL) const;
/**
* @brief performs a blockchain reorganization according to the longest chain rule
*
* This function aggregates all the actions necessary to switch to a
* newly-longer chain. If any step in the reorganization process fails,
* the blockchain is reverted to its previous state.
*
* @param alt_chain the chain to switch to
* @param discard_disconnected_chain whether or not to keep the old chain as an alternate
*
* @return false if the reorganization fails, otherwise true
*/
bool switch_to_alternative_blockchain(std::list<block_extended_info>& alt_chain, bool discard_disconnected_chain);
/**
* @brief removes the most recent block from the blockchain
*
* @return the block removed
*/
block pop_block_from_blockchain();
/**
* @brief validate and add a new block to the end of the blockchain
*
* This function is merely a convenience wrapper around the other
* of the same name. This one passes the block's hash to the other
* as well as the block and verification context.
*
* @param bl the block to be added
* @param bvc metadata concerning the block's validity
* @param notify if set to true, sends new block notification on success
*
* @return true if the block was added successfully, otherwise false
*/
bool handle_block_to_main_chain(const block& bl, block_verification_context& bvc, bool notify = true);
/**
* @brief validate and add a new block to the end of the blockchain
*
* When a block is given to Blockchain to be added to the blockchain, it
* is passed here if it is determined to belong at the end of the current
* chain.
*
* @param bl the block to be added
* @param id the hash of the block
* @param bvc metadata concerning the block's validity
* @param notify if set to true, sends new block notification on success
*
* @return true if the block was added successfully, otherwise false
*/
bool handle_block_to_main_chain(const block& bl, const crypto::hash& id, block_verification_context& bvc, bool notify = true);
/**
* @brief validate and add a new block to an alternate blockchain
*
* If a block to be added does not belong to the main chain, but there
* is an alternate chain to which it should be added, that is handled
* here.
*
* @param b the block to be added
* @param id the hash of the block
* @param bvc metadata concerning the block's validity
*
* @return true if the block was added successfully, otherwise false
*/
bool handle_alternative_block(const block& b, const crypto::hash& id, block_verification_context& bvc);
/**
* @brief builds a list of blocks connecting a block to the main chain
*
* @param prev_id the block hash of the tip of the alt chain
* @param alt_chain the chain to be added to
* @param timestamps returns the timestamps of previous blocks
* @param bvc the block verification context for error return
*
* @return true on success, false otherwise
*/
bool build_alt_chain(const crypto::hash &prev_id, std::list<block_extended_info>& alt_chain, std::vector<uint64_t> &timestamps, block_verification_context& bvc) const;
/**
* @brief gets the difficulty requirement for a new block on an alternate chain
*
* @param alt_chain the chain to be added to
* @param bei the block being added (and metadata, see ::block_extended_info)
*
* @return the difficulty requirement
*/
difficulty_type get_next_difficulty_for_alternative_chain(const std::list<block_extended_info>& alt_chain, block_extended_info& bei) const;
/**
* @brief sanity checks a miner transaction before validating an entire block
*
* This function merely checks basic things like the structure of the miner
* transaction, the unlock time, and that the amount doesn't overflow.
*
* @param b the block containing the miner transaction
* @param height the height at which the block will be added
* @param hf_version the consensus rules to apply
*
* @return false if anything is found wrong with the miner transaction, otherwise true
*/
bool prevalidate_miner_transaction(const block& b, uint64_t height, uint8_t hf_version);
/**
* @brief validates a miner (coinbase) transaction
*
* This function makes sure that the miner calculated his reward correctly
* and that his miner transaction totals reward + fee.
*
* @param b the block containing the miner transaction to be validated
* @param cumulative_block_weight the block's weight
* @param fee the total fees collected in the block
* @param base_reward return-by-reference the new block's generated coins
* @param already_generated_coins the amount of currency generated prior to this block
* @param partial_block_reward return-by-reference true if miner accepted only partial reward
* @param version hard fork version for that transaction
*
* @return false if anything is found wrong with the miner transaction, otherwise true
*/
bool validate_miner_transaction(const block& b, size_t cumulative_block_weight, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins, bool &partial_block_reward, uint8_t version);
/**
* @brief reverts the blockchain to its previous state following a failed switch
*
* If Blockchain fails to switch to an alternate chain when it means
* to do so, this function reverts the blockchain to how it was before
* the attempted switch.
*
* @param original_chain the chain to switch back to
* @param rollback_height the height to revert to before appending the original chain
*
* @return false if something goes wrong with reverting (very bad), otherwise true
*/
bool rollback_blockchain_switching(std::list<block>& original_chain, uint64_t rollback_height);
/**
* @brief gets recent block weights for median calculation
*
* get the block weights of the last <count> blocks, and return by reference <weights>.
*
* @param weights return-by-reference the list of weights
* @param count the number of blocks to get weights for
*/
void get_last_n_blocks_weights(std::vector<uint64_t>& weights, size_t count) const;
/**
* @brief gets block long term weight median
*
* get the block long term weight median of <count> blocks starting at <start_height>
*
* @param start_height the block height of the first block to query
* @param count the number of blocks to get weights for
*
* @return the long term median block weight
*/
uint64_t get_long_term_block_weight_median(uint64_t start_height, size_t count) const;
/**
* @brief checks if a transaction is unlocked (its outputs spendable)
*
* This function checks to see if a transaction is unlocked.
* unlock_time is either a block index or a unix time.
*
* @param unlock_time the unlock parameter (height or time)
* @param hf_version the consensus rules version to use
*
* @return true if spendable, otherwise false
*/
bool is_tx_spendtime_unlocked(uint64_t unlock_time, uint8_t hf_version) const;
/**
* @brief stores an invalid block in a separate container
*
* Storing invalid blocks allows quick dismissal of the same block
* if it is seen again.
*
* @param bl the invalid block
* @param h the block's hash
*
* @return false if the block cannot be stored for some reason, otherwise true
*/
bool add_block_as_invalid(const block& bl, const crypto::hash& h);
/**
* @brief stores an invalid block in a separate container
*
* Storing invalid blocks allows quick dismissal of the same block
* if it is seen again.
*
* @param bei the invalid block (see ::block_extended_info)
* @param h the block's hash
*
* @return false if the block cannot be stored for some reason, otherwise true
*/
bool add_block_as_invalid(const block_extended_info& bei, const crypto::hash& h);
/**
* @brief checks a block's timestamp
*
* This function grabs the timestamps from the most recent <n> blocks,
* where n = BLOCKCHAIN_TIMESTAMP_CHECK_WINDOW. If there are not those many
* blocks in the blockchain, the timestap is assumed to be valid. If there
* are, this function returns:
* true if the block's timestamp is not less than the timestamp of the
* median of the selected blocks
* false otherwise
*
* @param b the block to be checked
* @param median_ts return-by-reference the median of timestamps
*
* @return true if the block's timestamp is valid, otherwise false
*/
bool check_block_timestamp(const block& b, uint64_t& median_ts) const;
bool check_block_timestamp(const block& b) const { uint64_t median_ts; return check_block_timestamp(b, median_ts); }
/**
* @brief checks a block's timestamp
*
* If the block is not more recent than the median of the recent
* timestamps passed here, it is considered invalid.
*
* @param timestamps a list of the most recent timestamps to check against
* @param b the block to be checked
*
* @return true if the block's timestamp is valid, otherwise false
*/
bool check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b, uint64_t& median_ts) const;
bool check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b) const { uint64_t median_ts; return check_block_timestamp(timestamps, b, median_ts); }
/**
* @brief finish an alternate chain's timestamp window from the main chain
*
* for an alternate chain, get the timestamps from the main chain to complete
* the needed number of timestamps for the BLOCKCHAIN_TIMESTAMP_CHECK_WINDOW.
*
* @param start_height the alternate chain's attachment height to the main chain
* @param timestamps return-by-value the timestamps set to be populated
*
* @return true unless start_height is greater than the current blockchain height
*/
bool complete_timestamps_vector(uint64_t start_height, std::vector<uint64_t>& timestamps) const;
/**
* @brief calculate the block weight limit for the next block to be added
*
* @param long_term_effective_median_block_weight optionally return that value
*
* @return true
*/
bool update_next_cumulative_weight_limit(uint64_t *long_term_effective_median_block_weight = NULL);
void return_tx_to_pool(std::vector<std::pair<transaction, blobdata>> &txs);
/**
* @brief make sure a transaction isn't attempting a double-spend
*
* @param tx the transaction to check
* @param keys_this_block a cumulative list of spent keys for the current block
*
* @return false if a double spend was detected, otherwise true
*/
bool check_for_double_spend(const transaction& tx, key_images_container& keys_this_block) const;
/**
* @brief validates a transaction input's ring signature
*
* @param tx_prefix_hash the transaction prefix' hash
* @param key_image the key image generated from the true input
* @param pubkeys the public keys for each input in the ring signature
* @param sig the signature generated for each input in the ring signature
* @param result false if the ring signature is invalid, otherwise true
*/
void check_ring_signature(const crypto::hash &tx_prefix_hash, const crypto::key_image &key_image,
const std::vector<rct::ctkey> &pubkeys, const std::vector<crypto::signature> &sig, uint64_t &result) const;
/**
* @brief loads block hashes from compiled-in data set
*
* A (possibly empty) set of block hashes can be compiled into the
* monero daemon binary. This function loads those hashes into
* a useful state.
*
* @param get_checkpoints if set, will be called to get checkpoints data
*/
void load_compiled_in_block_hashes(const GetCheckpointsCallback& get_checkpoints);
/**
* @brief invalidates any cached block template
*/
void invalidate_block_template_cache();
/**
* @brief stores a new cached block template
*
* At some point, may be used to push an update to miners
*/
void cache_block_template(const block &b, const cryptonote::account_public_address &address, const blobdata &nonce, const difficulty_type &diff, uint64_t height, uint64_t expected_reward, uint64_t seed_height, const crypto::hash &seed_hash, uint64_t pool_cookie);
/**
* @brief sends new block notifications to ZMQ `miner_data` subscribers
*
* @param height current blockchain height
* @param seed_hash seed hash to use for mining
* @param prev_id hash of new blockchain tip
* @param already_generated_coins total coins mined by the network so far
*/
void send_miner_notifications(uint64_t height, const crypto::hash &seed_hash, const crypto::hash &prev_id, uint64_t already_generated_coins);
};
} // namespace cryptonote
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