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add new checkpointing behavior to Blockchain class

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This commit is contained in:
Thomas Winget 2014-11-01 19:03:37 -04:00 committed by warptangent
parent 767aac274b
commit 26a7db38eb
2 changed files with 78 additions and 3 deletions
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75
src/cryptonote_core/blockchain.cpp
View file

@ -50,6 +50,7 @@
#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:
@ -65,7 +66,7 @@ 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)
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__);
}
@ -2271,3 +2272,75 @@ bool Blockchain::add_new_block(const block& bl_, block_verification_context& bvc
return handle_block_to_main_chain(bl, id, bvc);
}
//------------------------------------------------------------------
void Blockchain::check_against_checkpoints(checkpoints& points, bool enforce)
{
const auto& pts = points.get_points();
for (const auto& pt : pts)
{
// if the checkpoint is for a block we don't have yet, move on
if (pt.first >= m_db->height())
{
continue;
}
if (!points.check_block(pt.first, m_db->get_block_hash_from_height(pt.first)))
{
// if asked to enforce checkpoints, roll back to a couple of blocks before the checkpoint
if (enforce)
{
LOG_ERROR("Local blockchain failed to pass a checkpoint, rolling back!");
std::list<block> empty;
rollback_blockchain_switching(empty, pt.first - 2);
}
else
{
LOG_ERROR("WARNING: local blockchain failed to pass a MoneroPulse checkpoint, and you could be on a fork. You should either sync up from scratch, OR download a fresh blockchain bootstrap, OR enable checkpoint enforcing with the --enforce-dns-checkpointing command-line option");
}
}
}
}
//------------------------------------------------------------------
// returns false if any of the checkpoints loading returns false.
// That should happen only if a checkpoint is added that conflicts
// with an existing checkpoint.
bool Blockchain::update_checkpoints(const std::string& file_path, bool check_dns)
{
if (!cryptonote::load_checkpoints_from_json(m_checkpoints, file_path))
{
return false;
}
// if we're checking both dns and json, load checkpoints from dns.
// if we're not hard-enforcing dns checkpoints, handle accordingly
if (m_enforce_dns_checkpoints && check_dns)
{
if (!cryptonote::load_checkpoints_from_dns(m_checkpoints))
{
return false;
}
}
else if (check_dns)
{
checkpoints dns_points;
cryptonote::load_checkpoints_from_dns(dns_points);
if (m_checkpoints.check_for_conflicts(dns_points))
{
check_against_checkpoints(dns_points, false);
}
else
{
LOG_PRINT_L0("One or more checkpoints fetched from DNS conflicted with existing checkpoints!");
}
}
check_against_checkpoints(m_checkpoints, true);
return true;
}
//------------------------------------------------------------------
void Blockchain::set_enforce_dns_checkpoints(bool enforce_checkpoints)
{
m_enforce_dns_checkpoints = enforce_checkpoints;
}

6
src/cryptonote_core/blockchain.h
View file

@ -141,8 +141,9 @@ namespace cryptonote
void print_blockchain_index();
void print_blockchain_outs(const std::string& file);
void set_enforce_dns_checkpoints(bool enforce) { }
bool update_checkpoints(const std::string& path, bool dns) { return true; }
void check_against_checkpoints(checkpoints& points, bool enforce);
void set_enforce_dns_checkpoints(bool enforce);
bool update_checkpoints(const std::string& file_path, bool check_dns);
private:
typedef std::unordered_map<crypto::hash, size_t> blocks_by_id_index;
@ -179,6 +180,7 @@ namespace cryptonote
std::atomic<bool> m_is_in_checkpoint_zone;
std::atomic<bool> m_is_blockchain_storing;
bool m_testnet;
bool m_enforce_dns_checkpoints;
bool switch_to_alternative_blockchain(std::list<blocks_ext_by_hash::iterator>& alt_chain, bool discard_disconnected_chain);
block pop_block_from_blockchain();