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424 lines
12 KiB
C++
424 lines
12 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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#include <algorithm>
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#include <cstdio>
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#include "cryptonote_basic/cryptonote_basic.h"
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#include "blockchain_db/blockchain_db.h"
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#include "hardfork.h"
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "hardfork"
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using namespace cryptonote;
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static uint8_t get_block_vote(const cryptonote::block &b)
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{
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// Pre-hardfork blocks have a minor version hardcoded to 0.
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// For the purposes of voting, we consider 0 to refer to
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// version number 1, which is what all blocks from the genesis
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// block are. It makes things simpler.
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if (b.minor_version == 0)
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return 1;
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return b.minor_version;
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}
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static uint8_t get_block_version(const cryptonote::block &b)
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{
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return b.major_version;
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}
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HardFork::HardFork(cryptonote::BlockchainDB &db, uint8_t original_version, uint64_t original_version_till_height, time_t forked_time, time_t update_time, uint64_t window_size, uint8_t default_threshold_percent):
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db(db),
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forked_time(forked_time),
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update_time(update_time),
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window_size(window_size),
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default_threshold_percent(default_threshold_percent),
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original_version(original_version),
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original_version_till_height(original_version_till_height),
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current_fork_index(0)
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{
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if (window_size == 0)
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throw "window_size needs to be strictly positive";
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if (default_threshold_percent > 100)
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throw "default_threshold_percent needs to be between 0 and 100";
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}
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bool HardFork::add_fork(uint8_t version, uint64_t height, uint8_t threshold, time_t time)
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{
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CRITICAL_REGION_LOCAL(lock);
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// add in order
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if (version == 0)
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return false;
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if (!heights.empty()) {
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if (version <= heights.back().version)
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return false;
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if (height <= heights.back().height)
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return false;
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if (time <= heights.back().time)
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return false;
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}
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if (threshold > 100)
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return false;
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heights.push_back(Params(version, height, threshold, time));
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return true;
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}
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bool HardFork::add_fork(uint8_t version, uint64_t height, time_t time)
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{
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return add_fork(version, height, default_threshold_percent, time);
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}
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uint8_t HardFork::get_effective_version(uint8_t voting_version) const
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{
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if (!heights.empty()) {
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uint8_t max_version = heights.back().version;
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if (voting_version > max_version)
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voting_version = max_version;
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}
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return voting_version;
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}
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bool HardFork::do_check(uint8_t block_version, uint8_t voting_version) const
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{
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return block_version == heights[current_fork_index].version
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&& voting_version >= heights[current_fork_index].version;
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}
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bool HardFork::check(const cryptonote::block &block) const
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{
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CRITICAL_REGION_LOCAL(lock);
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return do_check(::get_block_version(block), ::get_block_vote(block));
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}
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bool HardFork::do_check_for_height(uint8_t block_version, uint8_t voting_version, uint64_t height) const
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{
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int fork_index = get_voted_fork_index(height);
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return block_version == heights[fork_index].version
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&& voting_version >= heights[fork_index].version;
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}
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bool HardFork::check_for_height(const cryptonote::block &block, uint64_t height) const
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{
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CRITICAL_REGION_LOCAL(lock);
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return do_check_for_height(::get_block_version(block), ::get_block_vote(block), height);
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}
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bool HardFork::add(uint8_t block_version, uint8_t voting_version, uint64_t height)
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{
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CRITICAL_REGION_LOCAL(lock);
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if (!do_check(block_version, voting_version))
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return false;
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db.set_hard_fork_version(height, heights[current_fork_index].version);
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voting_version = get_effective_version(voting_version);
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while (versions.size() >= window_size) {
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const uint8_t old_version = versions.front();
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assert(last_versions[old_version] >= 1);
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last_versions[old_version]--;
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versions.pop_front();
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}
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last_versions[voting_version]++;
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versions.push_back(voting_version);
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uint8_t voted = get_voted_fork_index(height + 1);
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if (voted > current_fork_index) {
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current_fork_index = voted;
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}
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return true;
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}
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bool HardFork::add(const cryptonote::block &block, uint64_t height)
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{
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return add(::get_block_version(block), ::get_block_vote(block), height);
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}
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void HardFork::init()
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{
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CRITICAL_REGION_LOCAL(lock);
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// add a placeholder for the default version, to avoid special cases
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if (heights.empty())
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heights.push_back(Params(original_version, 0, 0, 0));
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versions.clear();
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for (size_t n = 0; n < 256; ++n)
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last_versions[n] = 0;
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current_fork_index = 0;
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// restore state from DB
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uint64_t height = db.height();
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if (height > window_size)
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height -= window_size - 1;
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else
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height = 1;
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rescan_from_chain_height(height);
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MDEBUG("init done");
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}
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uint8_t HardFork::get_block_version(uint64_t height) const
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{
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if (height <= original_version_till_height)
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return original_version;
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const cryptonote::block &block = db.get_block_from_height(height);
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return ::get_block_version(block);
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}
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bool HardFork::reorganize_from_block_height(uint64_t height)
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{
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CRITICAL_REGION_LOCAL(lock);
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if (height >= db.height())
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return false;
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bool stop_batch = db.batch_start();
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versions.clear();
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for (size_t n = 0; n < 256; ++n)
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last_versions[n] = 0;
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const uint64_t rescan_height = height >= (window_size - 1) ? height - (window_size -1) : 0;
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const uint8_t start_version = height == 0 ? original_version : db.get_hard_fork_version(height);
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while (current_fork_index > 0 && heights[current_fork_index].version > start_version) {
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--current_fork_index;
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}
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for (uint64_t h = rescan_height; h <= height; ++h) {
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cryptonote::block b = db.get_block_from_height(h);
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const uint8_t v = get_effective_version(get_block_vote(b));
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last_versions[v]++;
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versions.push_back(v);
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}
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uint8_t voted = get_voted_fork_index(height + 1);
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if (voted > current_fork_index) {
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current_fork_index = voted;
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}
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const uint64_t bc_height = db.height();
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for (uint64_t h = height + 1; h < bc_height; ++h) {
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add(db.get_block_from_height(h), h);
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}
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if (stop_batch)
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db.batch_stop();
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return true;
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}
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bool HardFork::reorganize_from_chain_height(uint64_t height)
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{
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if (height == 0)
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return false;
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return reorganize_from_block_height(height - 1);
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}
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bool HardFork::rescan_from_block_height(uint64_t height)
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{
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CRITICAL_REGION_LOCAL(lock);
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db_rtxn_guard rtxn_guard(&db);
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if (height >= db.height())
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return false;
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versions.clear();
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for (size_t n = 0; n < 256; ++n)
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last_versions[n] = 0;
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for (uint64_t h = height; h < db.height(); ++h) {
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cryptonote::block b = db.get_block_from_height(h);
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const uint8_t v = get_effective_version(get_block_vote(b));
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last_versions[v]++;
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versions.push_back(v);
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}
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uint8_t lastv = db.get_hard_fork_version(db.height() - 1);
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current_fork_index = 0;
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while (current_fork_index + 1 < heights.size() && heights[current_fork_index].version != lastv)
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++current_fork_index;
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uint8_t voted = get_voted_fork_index(db.height());
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if (voted > current_fork_index) {
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current_fork_index = voted;
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}
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return true;
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}
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bool HardFork::rescan_from_chain_height(uint64_t height)
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{
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if (height == 0)
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return false;
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return rescan_from_block_height(height - 1);
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}
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void HardFork::on_block_popped(uint64_t nblocks)
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{
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CHECK_AND_ASSERT_THROW_MES(nblocks > 0, "nblocks must be greater than 0");
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CRITICAL_REGION_LOCAL(lock);
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const uint64_t new_chain_height = db.height();
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const uint64_t old_chain_height = new_chain_height + nblocks;
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uint8_t version;
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for (uint64_t height = old_chain_height - 1; height >= new_chain_height; --height)
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{
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version = versions.back();
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last_versions[version]--;
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versions.pop_back();
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version = db.get_hard_fork_version(height);
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versions.push_front(version);
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last_versions[version]++;
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}
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// does not take voting into account
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for (current_fork_index = heights.size() - 1; current_fork_index > 0; --current_fork_index)
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if (new_chain_height >= heights[current_fork_index].height)
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break;
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}
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int HardFork::get_voted_fork_index(uint64_t height) const
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{
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CRITICAL_REGION_LOCAL(lock);
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uint32_t accumulated_votes = 0;
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for (int n = heights.size() - 1; n >= 0; --n) {
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uint8_t v = heights[n].version;
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accumulated_votes += last_versions[v];
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uint32_t threshold = (window_size * heights[n].threshold + 99) / 100;
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if (height >= heights[n].height && accumulated_votes >= threshold) {
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return n;
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}
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}
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return current_fork_index;
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}
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HardFork::State HardFork::get_state(time_t t) const
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{
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CRITICAL_REGION_LOCAL(lock);
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// no hard forks setup yet
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if (heights.size() <= 1)
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return Ready;
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time_t t_last_fork = heights.back().time;
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if (t >= t_last_fork + forked_time)
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return LikelyForked;
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if (t >= t_last_fork + update_time)
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return UpdateNeeded;
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return Ready;
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}
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HardFork::State HardFork::get_state() const
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{
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return get_state(time(NULL));
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}
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uint8_t HardFork::get(uint64_t height) const
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{
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CRITICAL_REGION_LOCAL(lock);
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if (height > db.height()) {
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assert(false);
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return 255;
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}
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if (height == db.height()) {
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return get_current_version();
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}
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return db.get_hard_fork_version(height);
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}
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uint8_t HardFork::get_current_version() const
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{
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CRITICAL_REGION_LOCAL(lock);
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return heights[current_fork_index].version;
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}
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uint8_t HardFork::get_ideal_version() const
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{
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CRITICAL_REGION_LOCAL(lock);
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return heights.back().version;
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}
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uint8_t HardFork::get_ideal_version(uint64_t height) const
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{
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CRITICAL_REGION_LOCAL(lock);
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for (unsigned int n = heights.size() - 1; n > 0; --n) {
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if (height >= heights[n].height) {
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return heights[n].version;
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}
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}
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return original_version;
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}
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uint64_t HardFork::get_earliest_ideal_height_for_version(uint8_t version) const
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{
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uint64_t height = std::numeric_limits<uint64_t>::max();
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for (auto i = heights.rbegin(); i != heights.rend(); ++i) {
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if (i->version >= version) {
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height = i->height;
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} else {
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break;
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}
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}
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return height;
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}
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uint8_t HardFork::get_next_version() const
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{
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CRITICAL_REGION_LOCAL(lock);
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uint64_t height = db.height();
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for (auto i = heights.rbegin(); i != heights.rend(); ++i) {
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if (height >= i->height) {
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return (i == heights.rbegin() ? i : (i - 1))->version;
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}
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}
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return original_version;
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}
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bool HardFork::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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CRITICAL_REGION_LOCAL(lock);
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const uint8_t current_version = heights[current_fork_index].version;
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const bool enabled = current_version >= version;
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window = versions.size();
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votes = 0;
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for (size_t n = version; n < 256; ++n)
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votes += last_versions[n];
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threshold = (window * heights[current_fork_index].threshold + 99) / 100;
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//assert((votes >= threshold) == enabled);
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earliest_height = get_earliest_ideal_height_for_version(version);
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voting = heights.back().version;
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return enabled;
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}
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