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275 lines
9.9 KiB
C++
275 lines
9.9 KiB
C++
// Copyright (c) 2014-2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include "syncobj.h"
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#include "cryptonote_basic/cryptonote_basic.h"
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namespace cryptonote
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{
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class BlockchainDB;
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class HardFork
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{
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public:
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typedef enum {
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LikelyForked,
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UpdateNeeded,
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Ready,
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} State;
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static const uint64_t DEFAULT_ORIGINAL_VERSION_TILL_HEIGHT = 0; // <= actual height
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static const time_t DEFAULT_FORKED_TIME = 31557600; // a year in seconds
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static const time_t DEFAULT_UPDATE_TIME = 31557600 / 2;
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static const uint64_t DEFAULT_WINDOW_SIZE = 10080; // supermajority window check length - a week
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static const uint8_t DEFAULT_THRESHOLD_PERCENT = 80;
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/**
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* @brief creates a new HardFork object
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*
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* @param original_version the block version for blocks 0 through to the first fork
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* @param forked_time the time in seconds before thinking we're forked
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* @param update_time the time in seconds before thinking we need to update
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* @param window_size the size of the window in blocks to consider for version voting
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* @param default_threshold_percent the size of the majority in percents
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*/
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HardFork(cryptonote::BlockchainDB &db, uint8_t original_version = 1, uint64_t original_version_till_height = DEFAULT_ORIGINAL_VERSION_TILL_HEIGHT, time_t forked_time = DEFAULT_FORKED_TIME, time_t update_time = DEFAULT_UPDATE_TIME, uint64_t window_size = DEFAULT_WINDOW_SIZE, uint8_t default_threshold_percent = DEFAULT_THRESHOLD_PERCENT);
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/**
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* @brief add a new hardfork height
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*
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* returns true if no error, false otherwise
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*
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* @param version the major block version for the fork
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* @param height The height the hardfork takes effect
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* @param threshold The threshold of votes needed for this fork (0-100)
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* @param time Approximate time of the hardfork (seconds since epoch)
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*/
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bool add_fork(uint8_t version, uint64_t height, uint8_t threshold, time_t time);
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/**
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* @brief add a new hardfork height
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*
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* returns true if no error, false otherwise
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*
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* @param version the major block version for the fork
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* @param height The height the hardfork takes effect
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* @param time Approximate time of the hardfork (seconds since epoch)
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*/
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bool add_fork(uint8_t version, uint64_t height, time_t time);
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/**
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* @brief initialize the object
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*
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* Must be done after adding all the required hardforks via add above
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*/
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void init();
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/**
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* @brief check whether a new block would be accepted
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*
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* returns true if the block is accepted, false otherwise
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*
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* @param block the new block
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*
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* This check is made by add. It is exposed publicly to allow
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* the caller to inexpensively check whether a block would be
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* accepted or rejected by its version number. Indeed, if this
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* check could only be done as part of add, the caller would
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* either have to add the block to the blockchain first, then
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* call add, then have to pop the block from the blockchain if
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* its version did not satisfy the hard fork requirements, or
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* call add first, then, if the hard fork requirements are met,
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* add the block to the blockchain, upon which a failure (the
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* block being invalid, double spending, etc) would cause the
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* hardfork object to reorganize.
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*/
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bool check(const cryptonote::block &block) const;
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/**
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* @brief same as check, but for a particular height, rather than the top
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*
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* NOTE: this does not play well with voting, and relies on voting to be
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* disabled (that is, forks happen on the scheduled date, whether or not
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* enough blocks have voted for the fork).
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*
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* returns true if no error, false otherwise
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*
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* @param block the new block
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* @param height which height to check for
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*/
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bool check_for_height(const cryptonote::block &block, uint64_t height) const;
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/**
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* @brief add a new block
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*
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* returns true if no error, false otherwise
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*
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* @param block the new block
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*/
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bool add(const cryptonote::block &block, uint64_t height);
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/**
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* @brief called when the blockchain is reorganized
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*
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* This will rescan the blockchain to determine which hard forks
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* have been triggered
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*
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* returns true if no error, false otherwise
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*
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* @param blockchain the blockchain
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* @param height of the last block kept from the previous blockchain
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*/
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bool reorganize_from_block_height(uint64_t height);
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bool reorganize_from_chain_height(uint64_t height);
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/**
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* @brief called when one or more blocks are popped from the blockchain
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*
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* The current fork will be updated by looking up the db,
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* which is much cheaper than recomputing everything
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*
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* @param new_chain_height the height of the chain after popping
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*/
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void on_block_popped(uint64_t new_chain_height);
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/**
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* @brief returns current state at the given time
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*
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* Based on the approximate time of the last known hard fork,
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* estimate whether we need to update, or if we're way behind
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*
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* @param t the time to consider
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*/
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State get_state(time_t t) const;
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State get_state() const;
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/**
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* @brief returns the hard fork version for the given block height
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*
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* @param height height of the block to check
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*/
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uint8_t get(uint64_t height) const;
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/**
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* @brief returns the latest "ideal" version
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*
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* This is the latest version that's been scheduled
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*/
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uint8_t get_ideal_version() const;
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/**
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* @brief returns the "ideal" version for a given height
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*
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* @param height height of the block to check
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*/
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uint8_t get_ideal_version(uint64_t height) const;
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/**
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* @brief returns the next version
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*
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* This is the version which will we fork to next
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*/
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uint8_t get_next_version() const;
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/**
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* @brief returns the current version
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*
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* This is the latest version that's past its trigger date and had enough votes
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* at one point in the past.
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*/
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uint8_t get_current_version() const;
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/**
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* @brief returns the earliest block a given version may activate
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*/
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uint64_t get_earliest_ideal_height_for_version(uint8_t version) const;
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/**
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* @brief returns information about current voting state
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*
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* returns true if the given version is enabled (ie, the current version
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* is at least the passed version), false otherwise
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*
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* @param version the version to check voting for
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* @param window the number of blocks considered in voting
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* @param votes number of votes for next version
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* @param threshold number of votes needed to switch to next version
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* @param earliest_height earliest height at which the version can take effect
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*/
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bool get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
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/**
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* @brief returns the size of the voting window in blocks
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*/
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uint64_t get_window_size() const { return window_size; }
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struct Params {
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uint8_t version;
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uint8_t threshold;
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uint64_t height;
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time_t time;
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Params(uint8_t version, uint64_t height, uint8_t threshold, time_t time): version(version), threshold(threshold), height(height), time(time) {}
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};
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private:
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uint8_t get_block_version(uint64_t height) const;
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bool do_check(uint8_t block_version, uint8_t voting_version) const;
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bool do_check_for_height(uint8_t block_version, uint8_t voting_version, uint64_t height) const;
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int get_voted_fork_index(uint64_t height) const;
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uint8_t get_effective_version(uint8_t voting_version) const;
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bool add(uint8_t block_version, uint8_t voting_version, uint64_t height);
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bool rescan_from_block_height(uint64_t height);
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bool rescan_from_chain_height(uint64_t height);
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private:
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BlockchainDB &db;
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time_t forked_time;
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time_t update_time;
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uint64_t window_size;
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uint8_t default_threshold_percent;
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uint8_t original_version;
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uint64_t original_version_till_height;
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std::vector<Params> heights;
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std::deque<uint8_t> versions; /* rolling window of the last N blocks' versions */
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unsigned int last_versions[256]; /* count of the block versions in the last N blocks */
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uint32_t current_fork_index;
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mutable epee::critical_section lock;
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};
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} // namespace cryptonote
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