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blockchain.cpp
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blockchain.cpp
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// Copyright (c) 2014, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include <algorithm>
#include <cstdio>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/filesystem.hpp>
#include "include_base_utils.h"
#include "cryptonote_basic_impl.h"
#include "tx_pool.h"
#include "blockchain.h"
#include "cryptonote_core/blockchain_db.h"
#include "cryptonote_core/BlockchainDB_impl/db_lmdb.h"
#include "cryptonote_format_utils.h"
#include "cryptonote_boost_serialization.h"
#include "cryptonote_config.h"
#include "miner.h"
#include "misc_language.h"
#include "profile_tools.h"
#include "file_io_utils.h"
#include "common/boost_serialization_helper.h"
#include "warnings.h"
#include "crypto/hash.h"
#include "cryptonote_core/checkpoints_create.h"
//#include "serialization/json_archive.h"
/* TODO:
* Clean up code:
* Possibly change how outputs are referred to/indexed in blockchain and wallets
*
*/
using namespace cryptonote;
using epee::string_tools::pod_to_hex;
DISABLE_VS_WARNINGS(4267)
//------------------------------------------------------------------
// TODO: initialize m_db with a concrete implementation of BlockchainDB
Blockchain::Blockchain(tx_memory_pool& tx_pool):m_db(), m_tx_pool(tx_pool), m_current_block_cumul_sz_limit(0), m_is_in_checkpoint_zone(false), m_is_blockchain_storing(false), m_testnet(false), m_enforce_dns_checkpoints(false)
{
LOG_PRINT_L3("Blockchain::" << __func__);
}
//------------------------------------------------------------------
//TODO: is this still needed? I don't think so - tewinget
template<class archive_t>
void Blockchain::serialize(archive_t & ar, const unsigned int version)
{
LOG_PRINT_L3("Blockchain::" << __func__);
if(version < 11)
return;
CRITICAL_REGION_LOCAL(m_blockchain_lock);
ar & m_blocks;
ar & m_blocks_index;
ar & m_transactions;
ar & m_spent_keys;
ar & m_alternative_chains;
ar & m_outputs;
ar & m_invalid_blocks;
ar & m_current_block_cumul_sz_limit;
/*serialization bug workaround*/
if(version > 11)
{
uint64_t total_check_count = m_db->height() + m_blocks_index.size() + m_transactions.size() + m_spent_keys.size() + m_alternative_chains.size() + m_outputs.size() + m_invalid_blocks.size() + m_current_block_cumul_sz_limit;
if(archive_t::is_saving::value)
{
ar & total_check_count;
}else
{
uint64_t total_check_count_loaded = 0;
ar & total_check_count_loaded;
if(total_check_count != total_check_count_loaded)
{
LOG_ERROR("Blockchain storage data corruption detected. total_count loaded from file = " << total_check_count_loaded << ", expected = " << total_check_count);
LOG_PRINT_L0("Blockchain storage:" << std::endl <<
"m_blocks: " << m_db->height() << std::endl <<
"m_blocks_index: " << m_blocks_index.size() << std::endl <<
"m_transactions: " << m_transactions.size() << std::endl <<
"m_spent_keys: " << m_spent_keys.size() << std::endl <<
"m_alternative_chains: " << m_alternative_chains.size() << std::endl <<
"m_outputs: " << m_outputs.size() << std::endl <<
"m_invalid_blocks: " << m_invalid_blocks.size() << std::endl <<
"m_current_block_cumul_sz_limit: " << m_current_block_cumul_sz_limit);
throw std::runtime_error("Blockchain data corruption");
}
}
}
LOG_PRINT_L3("Blockchain storage:" << std::endl <<
"m_blocks: " << m_db->height() << std::endl <<
"m_blocks_index: " << m_blocks_index.size() << std::endl <<
"m_transactions: " << m_transactions.size() << std::endl <<
"m_spent_keys: " << m_spent_keys.size() << std::endl <<
"m_alternative_chains: " << m_alternative_chains.size() << std::endl <<
"m_outputs: " << m_outputs.size() << std::endl <<
"m_invalid_blocks: " << m_invalid_blocks.size() << std::endl <<
"m_current_block_cumul_sz_limit: " << m_current_block_cumul_sz_limit);
}
//------------------------------------------------------------------
bool Blockchain::have_tx(const crypto::hash &id) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
return m_db->tx_exists(id);
}
//------------------------------------------------------------------
bool Blockchain::have_tx_keyimg_as_spent(const crypto::key_image &key_im) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
return m_db->has_key_image(key_im);
}
//------------------------------------------------------------------
// 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.
template<class visitor_t>
bool Blockchain::scan_outputkeys_for_indexes(const txin_to_key& tx_in_to_key, visitor_t& vis, uint64_t* pmax_related_block_height) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
// verify that the input has key offsets (that it exists properly, really)
if(!tx_in_to_key.key_offsets.size())
return false;
// cryptonote_format_utils uses relative offsets for indexing to the global
// outputs list. that is to say that absolute offset #2 is absolute offset
// #1 plus relative offset #2.
// TODO: Investigate if this is necessary / why this is done.
std::vector<uint64_t> absolute_offsets = relative_output_offsets_to_absolute(tx_in_to_key.key_offsets);
//std::vector<std::pair<crypto::hash, size_t> >& amount_outs_vec = it->second;
size_t count = 0;
for (const uint64_t& i : absolute_offsets)
{
try
{
// get tx hash and output index for output
auto output_index = m_db->get_output_tx_and_index(tx_in_to_key.amount, i);
// get tx that output is from
auto tx = m_db->get_tx(output_index.first);
// make sure output index is within range for the given transaction
if (output_index.second >= tx.vout.size())
{
LOG_PRINT_L0("Output does not exist. tx = " << output_index.first << ", index = " << output_index.second);
return false;
}
// call to the passed boost visitor to grab the public key for the output
if(!vis.handle_output(tx, tx.vout[output_index.second]))
{
LOG_PRINT_L0("Failed to handle_output for output no = " << count << ", with absolute offset " << i);
return false;
}
// if on last output and pmax_related_block_height not null pointer
if(++count == absolute_offsets.size() && pmax_related_block_height)
{
// set *pmax_related_block_height to tx block height for this output
auto h = m_db->get_tx_block_height(output_index.first);
if(*pmax_related_block_height < h)
{
*pmax_related_block_height = h;
}
}
}
catch (const OUTPUT_DNE& e)
{
LOG_PRINT_L0("Output does not exist: " << e.what());
return false;
}
catch (const TX_DNE& e)
{
LOG_PRINT_L0("Transaction does not exist: " << e.what());
return false;
}
}
return true;
}
//------------------------------------------------------------------
uint64_t Blockchain::get_current_blockchain_height() const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
return m_db->height();
}
//------------------------------------------------------------------
//FIXME: possibly move this into the constructor, to avoid accidentally
// dereferencing a null BlockchainDB pointer
bool Blockchain::init(const std::string& config_folder, bool testnet)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
m_db = new BlockchainLMDB();
m_config_folder = config_folder;
m_testnet = testnet;
boost::filesystem::path folder(m_config_folder);
LOG_PRINT_L0("Loading blockchain...");
//FIXME: update filename for BlockchainDB
const std::string filename = folder.string();
try
{
m_db->open(filename);
}
catch (const DB_OPEN_FAILURE& e)
{
LOG_PRINT_L0("No blockchain file found, attempting to create one.");
try
{
m_db->create(filename);
}
catch (const DB_CREATE_FAILURE& db_create_error)
{
LOG_PRINT_L0("Unable to create BlockchainDB! This is not good...");
//TODO: make sure whatever calls this handles the return value properly
return false;
}
}
// if the blockchain is new, add the genesis block
// this feels kinda kludgy to do it this way, but can be looked at later.
// TODO: add function to create and store genesis block,
// taking testnet into account
if(!m_db->height())
{
LOG_PRINT_L0("Blockchain not loaded, generating genesis block.");
block bl = boost::value_initialized<block>();
block_verification_context bvc = boost::value_initialized<block_verification_context>();
if (testnet)
{
generate_genesis_block(bl, config::testnet::GENESIS_TX, config::testnet::GENESIS_NONCE);
}
else
{
generate_genesis_block(bl, config::GENESIS_TX, config::GENESIS_NONCE);
}
add_new_block(bl, bvc);
CHECK_AND_ASSERT_MES(!bvc.m_verifivation_failed, false, "Failed to add genesis block to blockchain");
}
// TODO: if blockchain load successful, verify blockchain against both
// hard-coded and runtime-loaded (and enforced) checkpoints.
else
{
}
// check how far behind we are
uint64_t top_block_timestamp = m_db->get_top_block_timestamp();
uint64_t timestamp_diff = time(NULL) - top_block_timestamp;
// genesis block has no timestamp, could probably change it to have timestamp of 1341378000...
if(!top_block_timestamp)
timestamp_diff = time(NULL) - 1341378000;
LOG_PRINT_GREEN("Blockchain initialized. last block: " << m_db->height() - 1 << ", " << epee::misc_utils::get_time_interval_string(timestamp_diff) << " time ago, current difficulty: " << get_difficulty_for_next_block(), LOG_LEVEL_0);
return true;
}
//------------------------------------------------------------------
bool Blockchain::store_blockchain()
{
LOG_PRINT_L3("Blockchain::" << __func__);
// TODO: make sure if this throws that it is not simply ignored higher
// up the call stack
try
{
m_db->sync();
}
catch (const std::exception& e)
{
LOG_PRINT_L0(std::string("Error syncing blockchain db: ") + e.what() + "-- shutting down now to prevent issues!");
throw;
}
catch (...)
{
LOG_PRINT_L0("There was an issue storing the blockchain, shutting down now to prevent issues!");
throw;
}
LOG_PRINT_L0("Blockchain stored OK.");
return true;
}
//------------------------------------------------------------------
bool Blockchain::deinit()
{
LOG_PRINT_L3("Blockchain::" << __func__);
// as this should be called if handling a SIGSEGV, need to check
// if m_db is a NULL pointer (and thus may have caused the illegal
// memory operation), otherwise we may cause a loop.
if (m_db == NULL)
{
throw new DB_ERROR("The db pointer is null in Blockchain, the blockchain may be corrupt!");
}
try
{
m_db->close();
}
catch (const std::exception& e)
{
LOG_PRINT_L0(std::string("Error closing blockchain db: ") + e.what());
}
catch (...)
{
LOG_PRINT_L0("There was an issue closing/storing the blockchain, shutting down now to prevent issues!");
}
delete m_db;
return true;
}
//------------------------------------------------------------------
// This function tells BlockchainDB to remove the top block from the
// blockchain and then returns all transactions (except the miner tx, of course)
// from it to the tx_pool
block Blockchain::pop_block_from_blockchain()
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
block popped_block;
std::vector<transaction> popped_txs;
try
{
m_db->pop_block(popped_block, popped_txs);
}
// anything that could cause this to throw is likely catastrophic,
// so we re-throw
catch (const std::exception& e)
{
LOG_ERROR("Error popping block from blockchain: " << e.what());
throw;
}
catch (...)
{
LOG_ERROR("Error popping block from blockchain, throwing!");
throw;
}
// return transactions from popped block to the tx_pool
for (transaction& tx : popped_txs)
{
if (!is_coinbase(tx))
{
cryptonote::tx_verification_context tvc = AUTO_VAL_INIT(tvc);
bool r = m_tx_pool.add_tx(tx, tvc, true);
if (!r)
{
LOG_ERROR("Error returning transaction to tx_pool");
}
}
}
return popped_block;
}
//------------------------------------------------------------------
bool Blockchain::reset_and_set_genesis_block(const block& b)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
m_transactions.clear();
m_spent_keys.clear();
m_blocks.clear();
m_blocks_index.clear();
m_alternative_chains.clear();
m_outputs.clear();
m_db->reset();
block_verification_context bvc = boost::value_initialized<block_verification_context>();
add_new_block(b, bvc);
return bvc.m_added_to_main_chain && !bvc.m_verifivation_failed;
}
//------------------------------------------------------------------
//TODO: move to BlockchainDB subclass
bool Blockchain::purge_transaction_keyimages_from_blockchain(const transaction& tx, bool strict_check)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
struct purge_transaction_visitor: public boost::static_visitor<bool>
{
key_images_container& m_spent_keys;
bool m_strict_check;
purge_transaction_visitor(key_images_container& spent_keys, bool strict_check):m_spent_keys(spent_keys), m_strict_check(strict_check){}
bool operator()(const txin_to_key& inp) const
{
//const crypto::key_image& ki = inp.k_image;
auto r = m_spent_keys.find(inp.k_image);
if(r != m_spent_keys.end())
{
m_spent_keys.erase(r);
}else
{
CHECK_AND_ASSERT_MES(!m_strict_check, false, "purge_block_data_from_blockchain: key image in transaction not found");
}
return true;
}
bool operator()(const txin_gen& inp) const
{
return true;
}
bool operator()(const txin_to_script& tx) const
{
return false;
}
bool operator()(const txin_to_scripthash& tx) const
{
return false;
}
};
BOOST_FOREACH(const txin_v& in, tx.vin)
{
bool r = boost::apply_visitor(purge_transaction_visitor(m_spent_keys, strict_check), in);
CHECK_AND_ASSERT_MES(!strict_check || r, false, "failed to process purge_transaction_visitor");
}
return true;
}
//------------------------------------------------------------------
crypto::hash Blockchain::get_tail_id(uint64_t& height) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
height = m_db->height();
return get_tail_id();
}
//------------------------------------------------------------------
crypto::hash Blockchain::get_tail_id() const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
return m_db->top_block_hash();
}
//------------------------------------------------------------------
/*TODO: this function was...poorly written. As such, I'm not entirely
* certain on what it was supposed to be doing. Need to look into this,
* but it doesn't seem terribly important just yet.
*
* 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...
*
*/
bool Blockchain::get_short_chain_history(std::list<crypto::hash>& ids) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
uint64_t i = 0;
uint64_t current_multiplier = 1;
uint64_t sz = m_db->height();
if(!sz)
return true;
bool genesis_included = false;
uint64_t current_back_offset = 1;
while(current_back_offset < sz)
{
ids.push_back(m_db->get_block_hash_from_height(sz - current_back_offset));
if(sz-current_back_offset == 0)
{
genesis_included = true;
}
if(i < 10)
{
++current_back_offset;
}
else
{
current_multiplier *= 2;
current_back_offset += current_multiplier;
}
++i;
}
if (!genesis_included)
{
ids.push_back(m_db->get_block_hash_from_height(0));
}
return true;
}
//------------------------------------------------------------------
crypto::hash Blockchain::get_block_id_by_height(uint64_t height) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
try
{
return m_db->get_block_hash_from_height(height);
}
catch (const BLOCK_DNE& e)
{
}
catch (const std::exception& e)
{
LOG_PRINT_L0(std::string("Something went wrong fetching block hash by height: ") + e.what());
throw;
}
catch (...)
{
LOG_PRINT_L0(std::string("Something went wrong fetching block hash by height"));
throw;
}
return null_hash;
}
//------------------------------------------------------------------
bool Blockchain::get_block_by_hash(const crypto::hash &h, block &blk) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
// try to find block in main chain
try
{
blk = m_db->get_block(h);
return true;
}
// try to find block in alternative chain
catch (const BLOCK_DNE& e)
{
blocks_ext_by_hash::const_iterator it_alt = m_alternative_chains.find(h);
if (m_alternative_chains.end() != it_alt) {
blk = it_alt->second.bl;
return true;
}
}
catch (const std::exception& e)
{
LOG_PRINT_L0(std::string("Something went wrong fetching block by hash: ") + e.what());
throw;
}
catch (...)
{
LOG_PRINT_L0(std::string("Something went wrong fetching block hash by hash"));
throw;
}
return false;
}
//------------------------------------------------------------------
//FIXME: this function does not seem to be called from anywhere, but
// if it ever is, should probably change std::list for std::vector
void Blockchain::get_all_known_block_ids(std::list<crypto::hash> &main, std::list<crypto::hash> &alt, std::list<crypto::hash> &invalid) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
for (auto& a : m_db->get_hashes_range(0, m_db->height() - 1))
{
main.push_back(a);
}
BOOST_FOREACH(const blocks_ext_by_hash::value_type &v, m_alternative_chains)
alt.push_back(v.first);
BOOST_FOREACH(const blocks_ext_by_hash::value_type &v, m_invalid_blocks)
invalid.push_back(v.first);
}
//------------------------------------------------------------------
// This function aggregates the cumulative difficulties and timestamps of the
// last DIFFICULTY_BLOCKS_COUNT blocks and passes them to next_difficulty,
// returning the result of that call. Ignores the genesis block, and can use
// less blocks than desired if there aren't enough.
difficulty_type Blockchain::get_difficulty_for_next_block() const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
std::vector<uint64_t> timestamps;
std::vector<difficulty_type> cumulative_difficulties;
auto h = m_db->height();
size_t offset = h - std::min<size_t>(h, static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT));
if (offset == 0)
{
++offset;
}
for(; offset < h; offset++)
{
timestamps.push_back(m_db->get_block_timestamp(offset));
cumulative_difficulties.push_back(m_db->get_block_cumulative_difficulty(offset));
}
return next_difficulty(timestamps, cumulative_difficulties);
}
//------------------------------------------------------------------
// This function removes blocks from the blockchain until it gets to the
// position where the blockchain switch started and then re-adds the blocks
// that had been removed.
bool Blockchain::rollback_blockchain_switching(std::list<block>& original_chain, uint64_t rollback_height)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
// remove blocks from blockchain until we get back to where we should be.
while (m_db->height() != rollback_height)
{
pop_block_from_blockchain();
}
//return back original chain
for (auto& bl : original_chain)
{
block_verification_context bvc = boost::value_initialized<block_verification_context>();
bool r = handle_block_to_main_chain(bl, bvc);
CHECK_AND_ASSERT_MES(r && bvc.m_added_to_main_chain, false, "PANIC!!! failed to add (again) block while chain switching during the rollback!");
}
LOG_PRINT_L1("Rollback to height " << rollback_height << " was successful.");
if (original_chain.size())
{
LOG_PRINT_L1("Restoration to previous blockchain successful as well.");
}
return true;
}
//------------------------------------------------------------------
// This function attempts to switch to an alternate chain, returning
// boolean based on success therein.
bool Blockchain::switch_to_alternative_blockchain(std::list<blocks_ext_by_hash::iterator>& alt_chain, bool discard_disconnected_chain)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
// if empty alt chain passed (not sure how that could happen), return false
CHECK_AND_ASSERT_MES(alt_chain.size(), false, "switch_to_alternative_blockchain: empty chain passed");
// verify that main chain has front of alt chain's parent block
if (!m_db->block_exists(alt_chain.front()->second.bl.prev_id))
{
LOG_ERROR("Attempting to move to an alternate chain, but it doesn't appear to connect to the main chain!");
return false;
}
// pop blocks from the blockchain until the top block is the parent
// of the front block of the alt chain.
std::list<block> disconnected_chain;
while (m_db->top_block_hash() != alt_chain.front()->second.bl.prev_id)
{
block b = pop_block_from_blockchain();
disconnected_chain.push_front(b);
}
auto split_height = m_db->height();
//connecting new alternative chain
for(auto alt_ch_iter = alt_chain.begin(); alt_ch_iter != alt_chain.end(); alt_ch_iter++)
{
auto ch_ent = *alt_ch_iter;
block_verification_context bvc = boost::value_initialized<block_verification_context>();
// add block to main chain
bool r = handle_block_to_main_chain(ch_ent->second.bl, bvc);
// if adding block to main chain failed, rollback to previous state and
// return false
if(!r || !bvc.m_added_to_main_chain)
{
LOG_PRINT_L0("Failed to switch to alternative blockchain");
// rollback_blockchain_switching should be moved to two different
// functions: rollback and apply_chain, but for now we pretend it is
// just the latter (because the rollback was done above).
rollback_blockchain_switching(disconnected_chain, m_db->height());
// FIXME: Why do we keep invalid blocks around? Possibly in case we hear
// about them again so we can immediately dismiss them, but needs some
// looking into.
add_block_as_invalid(ch_ent->second, get_block_hash(ch_ent->second.bl));
LOG_PRINT_L0("The block was inserted as invalid while connecting new alternative chain, block_id: " << get_block_hash(ch_ent->second.bl));
m_alternative_chains.erase(ch_ent);
for(auto alt_ch_to_orph_iter = ++alt_ch_iter; alt_ch_to_orph_iter != alt_chain.end(); alt_ch_to_orph_iter++)
{
add_block_as_invalid((*alt_ch_iter)->second, (*alt_ch_iter)->first);
m_alternative_chains.erase(*alt_ch_to_orph_iter);
}
return false;
}
}
// if we're to keep the disconnected blocks, add them as alternates
if(!discard_disconnected_chain)
{
//pushing old chain as alternative chain
for (auto& old_ch_ent : disconnected_chain)
{
block_verification_context bvc = boost::value_initialized<block_verification_context>();
bool r = handle_alternative_block(old_ch_ent, get_block_hash(old_ch_ent), bvc);
if(!r)
{
LOG_ERROR("Failed to push ex-main chain blocks to alternative chain ");
// previously this would fail the blockchain switching, but I don't
// think this is bad enough to warrant that.
}
}
}
//removing alt_chain entries from alternative chain
BOOST_FOREACH(auto ch_ent, alt_chain)
{
m_alternative_chains.erase(ch_ent);
}
LOG_PRINT_GREEN("REORGANIZE SUCCESS! on height: " << split_height << ", new blockchain size: " << m_db->height(), LOG_LEVEL_0);
return true;
}
//------------------------------------------------------------------
// This function calculates the difficulty target for the block being added to
// an alternate chain.
difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std::list<blocks_ext_by_hash::iterator>& alt_chain, block_extended_info& bei) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
std::vector<uint64_t> timestamps;
std::vector<difficulty_type> cumulative_difficulties;
// if the alt chain isn't long enough to calculate the difficulty target
// based on its blocks alone, need to get more blocks from the main chain
if(alt_chain.size()< DIFFICULTY_BLOCKS_COUNT)
{
CRITICAL_REGION_LOCAL(m_blockchain_lock);
// Figure out start and stop offsets for main chain blocks
size_t main_chain_stop_offset = alt_chain.size() ? alt_chain.front()->second.height : bei.height;
size_t main_chain_count = DIFFICULTY_BLOCKS_COUNT - std::min(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT), alt_chain.size());
main_chain_count = std::min(main_chain_count, main_chain_stop_offset);
size_t main_chain_start_offset = main_chain_stop_offset - main_chain_count;
if(!main_chain_start_offset)
++main_chain_start_offset; //skip genesis block
// get difficulties and timestamps from relevant main chain blocks
for(; main_chain_start_offset < main_chain_stop_offset; ++main_chain_start_offset)
{
timestamps.push_back(m_db->get_block_timestamp(main_chain_start_offset));
cumulative_difficulties.push_back(m_db->get_block_cumulative_difficulty(main_chain_start_offset));
}
// make sure we haven't accidentally grabbed too many blocks...maybe don't need this check?
CHECK_AND_ASSERT_MES((alt_chain.size() + timestamps.size()) <= DIFFICULTY_BLOCKS_COUNT, false,
"Internal error, alt_chain.size()[" << alt_chain.size()
<< "] + vtimestampsec.size()[" << timestamps.size()
<< "] NOT <= DIFFICULTY_WINDOW[]" << DIFFICULTY_BLOCKS_COUNT
);
for (auto it : alt_chain)
{
timestamps.push_back(it->second.bl.timestamp);
cumulative_difficulties.push_back(it->second.cumulative_difficulty);
}
}
// if the alt chain is long enough for the difficulty calc, grab difficulties
// and timestamps from it alone
else
{
timestamps.resize(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT));
cumulative_difficulties.resize(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT));
size_t count = 0;
size_t max_i = timestamps.size()-1;
// get difficulties and timestamps from most recent blocks in alt chain
BOOST_REVERSE_FOREACH(auto it, alt_chain)
{
timestamps[max_i - count] = it->second.bl.timestamp;
cumulative_difficulties[max_i - count] = it->second.cumulative_difficulty;
count++;
if(count >= DIFFICULTY_BLOCKS_COUNT)
break;
}
}
// calculate the difficulty target for the block and return it
return next_difficulty(timestamps, cumulative_difficulties);
}
//------------------------------------------------------------------
// This function does a sanity check on basic things that all miner
// transactions have in common, such as:
// one input, of type txin_gen, with height set to the block's height
// correct miner tx unlock time
// a non-overflowing tx amount (dubious necessity on this check)
bool Blockchain::prevalidate_miner_transaction(const block& b, uint64_t height)
{
LOG_PRINT_L3("Blockchain::" << __func__);
CHECK_AND_ASSERT_MES(b.miner_tx.vin.size() == 1, false, "coinbase transaction in the block has no inputs");
CHECK_AND_ASSERT_MES(b.miner_tx.vin[0].type() == typeid(txin_gen), false, "coinbase transaction in the block has the wrong type");
if(boost::get<txin_gen>(b.miner_tx.vin[0]).height != height)
{
LOG_PRINT_RED_L1("The miner transaction in block has invalid height: " << boost::get<txin_gen>(b.miner_tx.vin[0]).height << ", expected: " << height);
return false;
}
CHECK_AND_ASSERT_MES(b.miner_tx.unlock_time == height + CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW,
false,
"coinbase transaction transaction have wrong unlock time=" << b.miner_tx.unlock_time << ", expected " << height + CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW);
//check outs overflow
//NOTE: not entirely sure this is necessary, given that this function is
// designed simply to make sure the total amount for a transaction
// does not overflow a uint64_t, and this transaction *is* a uint64_t...
if(!check_outs_overflow(b.miner_tx))
{
LOG_PRINT_RED_L1("miner transaction have money overflow in block " << get_block_hash(b));
return false;
}
return true;
}
//------------------------------------------------------------------
// This function validates the miner transaction reward
bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_block_size, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins)
{
LOG_PRINT_L3("Blockchain::" << __func__);
//validate reward
uint64_t money_in_use = 0;
BOOST_FOREACH(auto& o, b.miner_tx.vout)
money_in_use += o.amount;
std::vector<size_t> last_blocks_sizes;
get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward)) {
LOG_PRINT_L0("block size " << cumulative_block_size << " is bigger than allowed for this blockchain");
return false;
}
if(base_reward + fee < money_in_use)
{
LOG_ERROR("coinbase transaction spend too much money (" << money_in_use << "). Block reward is " << base_reward + fee << "(" << base_reward << "+" << fee << ")");
return false;
}
if(base_reward + fee != money_in_use)
{
LOG_ERROR("coinbase transaction doesn't use full amount of block reward: spent: "
<< money_in_use << ", block reward " << base_reward + fee << "(" << base_reward << "+" << fee << ")");
return false;
}
return true;
}
//------------------------------------------------------------------
// get the block sizes of the last <count> blocks, starting at <from_height>
// and return by reference <sz>.
void Blockchain::get_last_n_blocks_sizes(std::vector<size_t>& sz, size_t count) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
auto h = m_db->height();
// this function is meaningless for an empty blockchain...granted it should never be empty
if(h == 0)
return;
// add size of last <count> blocks to vector <sz> (or less, if blockchain size < count)
size_t start_offset = h - std::min<size_t>(h, count);
for(size_t i = start_offset; i < h; i++)
{
sz.push_back(m_db->get_block_size(i));
}
}
//------------------------------------------------------------------
uint64_t Blockchain::get_current_cumulative_blocksize_limit() const
{
LOG_PRINT_L3("Blockchain::" << __func__);
return m_current_block_cumul_sz_limit;
}
//------------------------------------------------------------------
//TODO: This function only needed minor modification to work with BlockchainDB,
// and *works*. As such, to reduce the number of things that might break
// in moving to BlockchainDB, this function will remain otherwise
// unchanged for the time being.
//
// This function makes a new block for a miner to mine the hash for
//
// FIXME: this codebase references #if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
// in a lot of places. That flag is not referenced in any of the code
// nor any of the makefiles, howeve. Need to look into whether or not it's
// necessary at all.
bool Blockchain::create_block_template(block& b, const account_public_address& miner_address, difficulty_type& diffic, uint64_t& height, const blobdata& ex_nonce) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
size_t median_size;
uint64_t already_generated_coins;
CRITICAL_REGION_BEGIN(m_blockchain_lock);
b.major_version = CURRENT_BLOCK_MAJOR_VERSION;
b.minor_version = CURRENT_BLOCK_MINOR_VERSION;
b.prev_id = get_tail_id();
b.timestamp = time(NULL);
height = m_db->height();
diffic = get_difficulty_for_next_block();
CHECK_AND_ASSERT_MES(diffic, false, "difficulty owverhead.");
median_size = m_current_block_cumul_sz_limit / 2;
already_generated_coins = m_db->get_block_already_generated_coins(height - 1);
CRITICAL_REGION_END();
size_t txs_size;
uint64_t fee;
if (!m_tx_pool.fill_block_template(b, median_size, already_generated_coins, txs_size, fee)) {
return false;
}
#if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
size_t real_txs_size = 0;
uint64_t real_fee = 0;
CRITICAL_REGION_BEGIN(m_tx_pool.m_transactions_lock);
BOOST_FOREACH(crypto::hash &cur_hash, b.tx_hashes) {
auto cur_res = m_tx_pool.m_transactions.find(cur_hash);
if (cur_res == m_tx_pool.m_transactions.end()) {
LOG_ERROR("Creating block template: error: transaction not found");
continue;
}
tx_memory_pool::tx_details &cur_tx = cur_res->second;
real_txs_size += cur_tx.blob_size;
real_fee += cur_tx.fee;
if (cur_tx.blob_size != get_object_blobsize(cur_tx.tx)) {
LOG_ERROR("Creating block template: error: invalid transaction size");
}
uint64_t inputs_amount;
if (!get_inputs_money_amount(cur_tx.tx, inputs_amount)) {
LOG_ERROR("Creating block template: error: cannot get inputs amount");
} else if (cur_tx.fee != inputs_amount - get_outs_money_amount(cur_tx.tx)) {
LOG_ERROR("Creating block template: error: invalid fee");
}
}
if (txs_size != real_txs_size) {
LOG_ERROR("Creating block template: error: wrongly calculated transaction size");
}
if (fee != real_fee) {
LOG_ERROR("Creating block template: error: wrongly calculated fee");
}
CRITICAL_REGION_END();
LOG_PRINT_L1("Creating block template: height " << height <<
", median size " << median_size <<
", already generated coins " << already_generated_coins <<
", transaction size " << txs_size <<
", fee " << fee);
#endif
/*
two-phase miner transaction generation: we don't know exact block size until we prepare block, but we don't know reward until we know
block size, so first miner transaction generated with fake amount of money, and with phase we know think we know expected block size
*/
//make blocks coin-base tx looks close to real coinbase tx to get truthful blob size
bool r = construct_miner_tx(height, median_size, already_generated_coins, txs_size, fee, miner_address, b.miner_tx, ex_nonce, 11);
CHECK_AND_ASSERT_MES(r, false, "Failed to construc miner tx, first chance");
size_t cumulative_size = txs_size + get_object_blobsize(b.miner_tx);
#if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
LOG_PRINT_L1("Creating block template: miner tx size " << get_object_blobsize(b.miner_tx) <<
", cumulative size " << cumulative_size);
#endif
for (size_t try_count = 0; try_count != 10; ++try_count) {
r = construct_miner_tx(height, median_size, already_generated_coins, cumulative_size, fee, miner_address, b.miner_tx, ex_nonce, 11);
CHECK_AND_ASSERT_MES(r, false, "Failed to construc miner tx, second chance");
size_t coinbase_blob_size = get_object_blobsize(b.miner_tx);
if (coinbase_blob_size > cumulative_size - txs_size) {
cumulative_size = txs_size + coinbase_blob_size;