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chain_database.cpp
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chain_database.cpp
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//#define DEFAULT_LOGGER "blockchain"
#include <bts/blockchain/chain_database.hpp>
#include <bts/blockchain/genesis_config.hpp>
#include <bts/blockchain/genesis_json.hpp>
#include <bts/blockchain/operation_factory.hpp>
#include <bts/blockchain/market_records.hpp>
#include <bts/blockchain/time.hpp>
#include <bts/blockchain/fork_blocks.hpp>
#include <bts/db/level_map.hpp>
#include <bts/db/cached_level_map.hpp>
#include <bts/blockchain/config.hpp>
#include <bts/blockchain/checkpoints.hpp>
#include <fc/thread/mutex.hpp>
#include <fc/thread/unique_lock.hpp>
#include <fc/thread/non_preemptable_scope_check.hpp>
#include <fc/io/fstream.hpp>
#include <fc/io/json.hpp>
#include <fc/io/raw_variant.hpp>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <iomanip>
#include <deque>
using namespace bts::blockchain;
struct vote_del
{
vote_del( int64_t v = 0, account_id_type del = 0 )
:votes(v),delegate_id(del){}
int64_t votes;
account_id_type delegate_id;
friend bool operator == ( const vote_del& a, const vote_del& b )
{
return a.votes == b.votes && a.delegate_id == b.delegate_id;
}
friend bool operator < ( const vote_del& a, const vote_del& b )
{
if( a.votes != b.votes ) return a.votes > b.votes; /* Reverse so maps sort in descending order */
return a.delegate_id < b.delegate_id; /* Lowest id wins in ties */
}
};
struct fee_index
{
fee_index( share_type fees = 0, transaction_id_type trx = transaction_id_type() )
:_fees(fees),_trx(trx){}
share_type _fees;
transaction_id_type _trx;
friend bool operator == ( const fee_index& a, const fee_index& b )
{
return a._fees == b._fees && a._trx == b._trx;
}
friend bool operator < ( const fee_index& a, const fee_index& b )
{
if( a._fees == b._fees ) return a._trx < b._trx; /* Lowest id wins in ties */
return a._fees > b._fees; /* Reverse so that highest fee is placed first in sorted maps */
}
};
namespace bts { namespace blockchain {
// register exceptions here so it doesn't get optimized out by the linker
FC_REGISTER_EXCEPTIONS( (blockchain_exception)
(invalid_pts_address)
(addition_overflow)
(subtraction_overflow)
(asset_type_mismatch)
(unsupported_chain_operation) )
namespace detail
{
class chain_database_impl
{
public:
chain_database_impl():self(nullptr){}
#include "market_engine_v1.cpp"
#include "market_engine_v2.cpp"
#include "market_engine.cpp"
digest_type initialize_genesis( const optional<path>& genesis_file, bool chain_id_only = false );
std::pair<block_id_type, block_fork_data> store_and_index( const block_id_type& id, const full_block& blk );
void clear_pending( const full_block& blk );
void switch_to_fork( const block_id_type& block_id );
void extend_chain( const full_block& blk );
vector<block_id_type> get_fork_history( const block_id_type& id );
void pop_block();
void mark_invalid( const block_id_type& id, const fc::exception& reason );
void mark_included( const block_id_type& id, bool state );
void verify_header( const full_block&, const public_key_type& block_signee );
void apply_transactions( const full_block& block,
const pending_chain_state_ptr& );
void pay_delegate( const block_id_type& block_id,
const pending_chain_state_ptr&,
const public_key_type& block_signee );
void save_undo_state( const block_id_type& id,
const pending_chain_state_ptr& );
void update_head_block( const full_block& blk );
std::vector<block_id_type> fetch_blocks_at_number( uint32_t block_num );
std::pair<block_id_type, block_fork_data> recursive_mark_as_linked( const std::unordered_set<block_id_type>& ids );
void recursive_mark_as_invalid( const std::unordered_set<block_id_type>& ids, const fc::exception& reason );
void execute_markets(const fc::time_point_sec& timestamp, const pending_chain_state_ptr& pending_state );
void update_random_seed( const secret_hash_type& new_secret,
const pending_chain_state_ptr& pending_state );
void update_active_delegate_list(const full_block& block_data,
const pending_chain_state_ptr& pending_state );
void update_delegate_production_info( const full_block& block_data,
const pending_chain_state_ptr& pending_state,
const public_key_type& block_signee );
void revalidate_pending()
{
_pending_fee_index.clear();
vector<transaction_id_type> trx_to_discard;
_pending_trx_state = std::make_shared<pending_chain_state>( self->shared_from_this() );
auto itr = _pending_transaction_db.begin();
while( itr.valid() )
{
auto trx = itr.value();
auto trx_id = trx.id();
try {
auto eval_state = self->evaluate_transaction( trx, _relay_fee );
share_type fees = eval_state->get_fees();
_pending_fee_index[ fee_index( fees, trx_id ) ] = eval_state;
_pending_transaction_db.store( trx_id, trx );
}
catch ( const fc::canceled_exception& )
{
throw;
}
catch ( const fc::exception& e )
{
trx_to_discard.push_back(trx_id);
wlog( "discarding invalid transaction: ${id} ${e}",
("id",trx_id)("e",e.to_detail_string()) );
}
++itr;
}
for( const auto& item : trx_to_discard )
_pending_transaction_db.remove( item );
}
fc::future<void> _revalidate_pending;
fc::mutex _push_block_mutex;
/**
* Used to track the cumulative effect of all pending transactions that are known,
* new incomming transactions are evaluated relative to this state.
*
* After a new block is pushed this state is recalculated based upon what ever
* pending transactions remain.
*/
pending_chain_state_ptr _pending_trx_state;
chain_database* self;
unordered_set<chain_observer*> _observers;
digest_type _chain_id;
bool _skip_signature_verification;
share_type _relay_fee;
bts::db::level_map<uint32_t, std::vector<market_transaction> > _market_transactions_db;
bts::db::level_map<slate_id_type, delegate_slate > _slate_db;
bts::db::level_map<uint32_t, std::vector<block_id_type> > _fork_number_db;
bts::db::level_map<block_id_type,block_fork_data> _fork_db;
bts::db::level_map<uint32_t, fc::variant > _property_db;
#if 0
bts::db::level_map<proposal_id_type, proposal_record > _proposal_db;
bts::db::level_map<proposal_vote_id_type, proposal_vote > _proposal_vote_db;
#endif
/** the data required to 'undo' the changes a block made to the database */
bts::db::level_map<block_id_type,pending_chain_state> _undo_state_db;
// blocks in the current 'official' chain.
bts::db::level_map<uint32_t,block_id_type > _block_num_to_id_db;
// all blocks from any fork..
//bts::db::level_map<block_id_type,full_block> _block_id_to_block_db;
bts::db::level_map<block_id_type,block_record > _block_id_to_block_record_db;
bts::db::level_map<block_id_type,full_block> _block_id_to_block_data_db;
std::unordered_set<transaction_id_type> _known_transactions;
bts::db::level_map<transaction_id_type,transaction_record> _id_to_transaction_record_db;
// used to revert block state in the event of a fork
// bts::db::level_map<uint32_t,undo_data> _block_num_to_undo_data_db;
signed_block_header _head_block_header;
block_id_type _head_block_id;
bts::db::level_map< transaction_id_type, signed_transaction> _pending_transaction_db;
std::map< fee_index, transaction_evaluation_state_ptr > _pending_fee_index;
bts::db::level_map< asset_id_type, asset_record > _asset_db;
bts::db::level_map< balance_id_type, balance_record> _balance_db;
bts::db::level_map< account_id_type, account_record> _account_db;
bts::db::level_map< address, account_id_type > _address_to_account_db;
bts::db::level_map< string, account_id_type > _account_index_db;
bts::db::level_map< string, asset_id_type > _symbol_index_db;
bts::db::cached_level_map< vote_del, int > _delegate_vote_index_db;
bts::db::level_map< time_point_sec, slot_record > _slot_record_db;
bts::db::level_map< market_index_key, order_record > _ask_db;
bts::db::level_map< market_index_key, order_record > _bid_db;
bts::db::level_map< market_index_key, order_record > _short_db;
bts::db::level_map< market_index_key, collateral_record > _collateral_db;
bts::db::level_map< feed_index, feed_record> _feed_db;
bts::db::level_map< std::pair<asset_id_type,asset_id_type>, market_status> _market_status_db;
bts::db::level_map< market_history_key, market_history_record> _market_history_db;
/** used to prevent duplicate processing */
// bts::db::level_pod_map< transaction_id_type, transaction_location > _processed_transaction_id_db;
std::map<operation_type_enum, std::deque<operation>> _recent_operations;
void open_database(const fc::path& data_dir );
};
void chain_database_impl::open_database( const fc::path& data_dir )
{ try {
bool rebuild_index = false;
if( !fc::exists(data_dir / "index" ) )
{
ilog("Rebuilding database index...");
fc::create_directories( data_dir / "index" );
rebuild_index = true;
}
_property_db.open( data_dir / "index/property_db" );
auto database_version = _property_db.fetch_optional( chain_property_enum::database_version );
if( !database_version || database_version->as_int64() < BTS_BLOCKCHAIN_DATABASE_VERSION )
{
if ( !rebuild_index )
{
wlog( "old database version, upgrade and re-sync" );
_property_db.close();
fc::remove_all( data_dir / "index" );
fc::create_directories( data_dir / "index" );
_property_db.open( data_dir / "index/property_db" );
rebuild_index = true;
}
self->set_property( chain_property_enum::database_version, BTS_BLOCKCHAIN_DATABASE_VERSION );
self->set_property( chain_property_enum::accumulated_fees, 0 );
self->set_property( chain_property_enum::dirty_markets, variant( map<asset_id_type,asset_id_type>() ) );
}
else if( database_version && !database_version->is_null() && database_version->as_int64() > BTS_BLOCKCHAIN_DATABASE_VERSION )
{
FC_CAPTURE_AND_THROW( new_database_version, (database_version)(BTS_BLOCKCHAIN_DATABASE_VERSION) );
}
_market_transactions_db.open( data_dir / "index/market_transactions_db" );
_fork_number_db.open( data_dir / "index/fork_number_db" );
_fork_db.open( data_dir / "index/fork_db" );
_slate_db.open( data_dir / "index/slate_db" );
#if 0
_proposal_db.open( data_dir / "index/proposal_db" );
_proposal_vote_db.open( data_dir / "index/proposal_vote_db" );
#endif
_undo_state_db.open( data_dir / "index/undo_state_db" );
_block_id_to_block_record_db.open( data_dir / "index/block_id_to_block_record_db" );
_block_num_to_id_db.open( data_dir / "raw_chain/block_num_to_id_db" );
_block_id_to_block_data_db.open( data_dir / "raw_chain/block_id_to_block_data_db" );
_id_to_transaction_record_db.open( data_dir / "index/id_to_transaction_record_db" );
for( auto itr = _id_to_transaction_record_db.begin(); itr.valid(); ++itr )
_known_transactions.insert( itr.key() );
_pending_transaction_db.open( data_dir / "index/pending_transaction_db" );
_asset_db.open( data_dir / "index/asset_db" );
_balance_db.open( data_dir / "index/balance_db" );
_account_db.open( data_dir / "index/account_db" );
_address_to_account_db.open( data_dir / "index/address_to_account_db" );
_account_index_db.open( data_dir / "index/account_index_db" );
_symbol_index_db.open( data_dir / "index/symbol_index_db" );
_delegate_vote_index_db.open( data_dir / "index/delegate_vote_index_db" );
_slot_record_db.open( data_dir / "index/slot_record_db" );
_ask_db.open( data_dir / "index/ask_db" );
_bid_db.open( data_dir / "index/bid_db" );
_short_db.open( data_dir / "index/short_db" );
_collateral_db.open( data_dir / "index/collateral_db" );
_feed_db.open( data_dir / "index/feed_db" );
_market_status_db.open( data_dir / "index/market_status_db" );
_market_history_db.open( data_dir / "index/market_history_db" );
_pending_trx_state = std::make_shared<pending_chain_state>( self->shared_from_this() );
} FC_CAPTURE_AND_RETHROW( (data_dir) ) }
std::vector<block_id_type> chain_database_impl::fetch_blocks_at_number( uint32_t block_num )
{
std::vector<block_id_type> current_blocks;
auto itr = _fork_number_db.find( block_num );
if( itr.valid() ) return itr.value();
return current_blocks;
}
void chain_database_impl::clear_pending( const full_block& blk )
{
std::unordered_set<transaction_id_type> confirmed_trx_ids;
for( const auto& trx : blk.user_transactions )
{
auto id = trx.id();
confirmed_trx_ids.insert( id );
_pending_transaction_db.remove( id );
}
_pending_fee_index.clear();
// this schedules the revalidate-pending-transactions task to execute in this thread
// as soon as this current task (probably pushing a block) gets around to yielding.
// This was changed from waiting on the old _revalidate_pending to prevent yielding
// during the middle of pushing a block. If that happens, the database is in an
// inconsistent state and it confuses the p2p network code.
// We skip this step if we are dealing with blocks prior to the last checkpointed block
uint32_t last_checkpoint_block_num = 0;
if( !CHECKPOINT_BLOCKS.empty() )
last_checkpoint_block_num = (--(CHECKPOINT_BLOCKS.end()))->first;
if( (!_revalidate_pending.valid() || _revalidate_pending.ready()) && _head_block_header.block_num >= last_checkpoint_block_num )
_revalidate_pending = fc::async( [=](){ revalidate_pending(); }, "revalidate_pending" );
_pending_trx_state = std::make_shared<pending_chain_state>( self->shared_from_this() );
}
std::pair<block_id_type, block_fork_data> chain_database_impl::recursive_mark_as_linked( const std::unordered_set<block_id_type>& ids )
{
block_fork_data longest_fork;
uint32_t highest_block_num = 0;
block_id_type last_block_id;
std::unordered_set<block_id_type> next_ids = ids;
while( next_ids.size() )
{
std::unordered_set<block_id_type> pending;
for( const auto& item : next_ids )
{
block_fork_data record = _fork_db.fetch( item );
record.is_linked = true;
pending.insert( record.next_blocks.begin(), record.next_blocks.end() );
//ilog( "store: ${id} => ${data}", ("id",item)("data",record) );
_fork_db.store( item, record );
auto block_record = _block_id_to_block_record_db.fetch(item);
if( block_record.block_num > highest_block_num )
{
highest_block_num = block_record.block_num;
last_block_id = item;
longest_fork = record;
}
}
next_ids = pending;
}
return std::make_pair(last_block_id, longest_fork);
}
void chain_database_impl::recursive_mark_as_invalid(const std::unordered_set<block_id_type>& ids , const fc::exception& reason)
{
std::unordered_set<block_id_type> next_ids = ids;
while( next_ids.size() )
{
std::unordered_set<block_id_type> pending;
for( const auto& item : next_ids )
{
block_fork_data record = _fork_db.fetch( item );
record.is_valid = false;
record.invalid_reason = reason;
pending.insert( record.next_blocks.begin(), record.next_blocks.end() );
//ilog( "store: ${id} => ${data}", ("id",item)("data",record) );
_fork_db.store( item, record );
}
next_ids = pending;
}
}
/**
* Place the block in the block tree, the block tree contains all blocks
* and tracks whether they are valid, linked, and current.
*
* There are several options for this block:
*
* 1) It extends an existing block
* - a valid chain
* - an invalid chain
* - an unlinked chain
* 2) It is free floating and doesn't link to anything we have
* - create two entries into the database
* - one for this block
* - placeholder for previous
* - mark both as unlinked
* 3) It provides the missing link between the genesis block and an existing chain
* - all next blocks need to be updated to change state to 'linked'
*
* Returns the pair of the block id and block_fork_data of the block with the highest block number
* in the fork which contains the new block, in all of the above cases where the new block is linked;
* otherwise, returns the block id and fork data of the new block
*/
std::pair<block_id_type, block_fork_data> chain_database_impl::store_and_index( const block_id_type& block_id,
const full_block& block_data )
{ try {
auto now = blockchain::now();
//ilog( "block_number: ${n} id: ${id} prev: ${prev}",
// ("n",block_data.block_num)("id",block_id)("prev",block_data.previous) );
// first of all store this block at the given block number
_block_id_to_block_data_db.store( block_id, block_data );
if( !self->get_block_record( block_id ).valid() ) /* Only insert with latency if not already present */
{
auto latency = now - block_data.timestamp;
block_record record( block_data, self->get_current_random_seed(), block_data.block_size(), latency );
_block_id_to_block_record_db.store( block_id, record );
}
// update the parallel block list
vector<block_id_type> parallel_blocks = fetch_blocks_at_number( block_data.block_num );
if (std::find( parallel_blocks.begin(), parallel_blocks.end(), block_id ) == parallel_blocks.end())
{
// don't add the block to the list if it's already there.
// TODO: do we need to execute any of the rest of this function (or, for that matter, its caller) if the block is already there
parallel_blocks.push_back( block_id );
_fork_number_db.store( block_data.block_num, parallel_blocks );
}
// now find how it links in.
block_fork_data prev_fork_data;
auto prev_itr = _fork_db.find( block_data.previous );
if( prev_itr.valid() ) // we already know about its previous
{
ilog( " we already know about its previous: ${p}", ("p",block_data.previous) );
prev_fork_data = prev_itr.value();
prev_fork_data.next_blocks.insert(block_id);
//ilog( " ${id} = ${record}", ("id",prev_itr.key())("record",prev_fork_data) );
_fork_db.store( prev_itr.key(), prev_fork_data );
}
else
{
elog( " we don't know about its previous: ${p}", ("p",block_data.previous) );
// create it... we do not know about the previous block so
// we must create it and assume it is not linked...
prev_fork_data.next_blocks.insert(block_id);
prev_fork_data.is_linked = block_data.previous == block_id_type(); //false;
//ilog( " ${id} = ${record}", ("id",block_data.previous)("record",prev_fork_data) );
_fork_db.store( block_data.previous, prev_fork_data );
}
block_fork_data current_fork;
auto cur_itr = _fork_db.find( block_id );
current_fork.is_known = true;
if( cur_itr.valid() )
{
current_fork = cur_itr.value();
ilog( " current_fork: ${fork}", ("fork",current_fork) );
ilog( " prev_fork: ${prev_fork}", ("prev_fork",prev_fork_data) );
if( !current_fork.is_linked && prev_fork_data.is_linked )
{
// we found the missing link
current_fork.is_linked = true;
auto longest_fork = recursive_mark_as_linked( current_fork.next_blocks );
_fork_db.store( block_id, current_fork );
return longest_fork;
}
}
else
{
current_fork.is_linked = prev_fork_data.is_linked;
//ilog( " current_fork: ${id} = ${fork}", ("id",block_id)("fork",current_fork) );
}
_fork_db.store( block_id, current_fork );
return std::make_pair(block_id, current_fork);
} FC_CAPTURE_AND_RETHROW( (block_id) ) }
void chain_database_impl::mark_invalid(const block_id_type& block_id , const fc::exception& reason)
{
// fetch the fork data for block_id, mark it as invalid and
// then mark every item after it as invalid as well.
auto fork_data = _fork_db.fetch( block_id );
fork_data.is_valid = false;
fork_data.invalid_reason = reason;
_fork_db.store( block_id, fork_data );
recursive_mark_as_invalid( fork_data.next_blocks, reason );
}
void chain_database_impl::mark_included( const block_id_type& block_id, bool included )
{ try {
//ilog( "included: ${block_id} = ${state}", ("block_id",block_id)("state",included) );
auto fork_data = _fork_db.fetch( block_id );
//if( fork_data.is_included != included )
{
fork_data.is_included = included;
if( included )
{
fork_data.is_valid = true;
}
//ilog( "store: ${id} => ${data}", ("id",block_id)("data",fork_data) );
_fork_db.store( block_id, fork_data );
}
// fetch the fork data for block_id, mark it as included and
} FC_RETHROW_EXCEPTIONS( warn, "", ("block_id",block_id)("included",included) ) }
void chain_database_impl::switch_to_fork( const block_id_type& block_id )
{ try {
ilog( "switch from fork ${id} to ${to_id}", ("id",_head_block_id)("to_id",block_id) );
vector<block_id_type> history = get_fork_history( block_id );
FC_ASSERT( history.size() > 0 );
while( history.back() != _head_block_id )
{
ilog( " pop ${id}", ("id",_head_block_id) );
pop_block();
}
for( int32_t i = history.size()-2; i >= 0 ; --i )
{
ilog( " extend ${i}", ("i",history[i]) );
extend_chain( self->get_block( history[i] ) );
}
} FC_CAPTURE_AND_RETHROW( (block_id) ) }
void chain_database_impl::apply_transactions( const full_block& block,
const pending_chain_state_ptr& pending_state )
{
//ilog( "apply transactions from block: ${block_num} ${trxs}", ("block_num",block.block_num)("trxs",user_transactions) );
ilog( "Applying transactions from block: ${n}", ("n",block.block_num) );
uint32_t trx_num = 0;
try {
share_type total_fees = 0;
// apply changes from each transaction
for( const auto& trx : block.user_transactions )
{
//ilog( "applying ${trx}", ("trx",trx) );
transaction_evaluation_state_ptr trx_eval_state =
std::make_shared<transaction_evaluation_state>(pending_state,_chain_id);
trx_eval_state->evaluate( trx, _skip_signature_verification );
//ilog( "evaluation: ${e}", ("e",*trx_eval_state) );
// TODO: capture the evaluation state with a callback for wallets...
// summary.transaction_states.emplace_back( std::move(trx_eval_state) );
transaction_location trx_loc( block.block_num, trx_num );
//ilog( "store trx location: ${loc}", ("loc",trx_loc) );
transaction_record record( trx_loc, *trx_eval_state);
pending_state->store_transaction( trx.id(), record );
++trx_num;
total_fees += record.get_fees();
}
/* Collect fees in block record */
auto block_id = block.id();
auto block_record = self->get_block_record( block_id );
FC_ASSERT( block_record.valid() );
block_record->total_fees += total_fees;
_block_id_to_block_record_db.store( block_id, *block_record );
auto prev_accumulated_fees = pending_state->get_accumulated_fees();
pending_state->set_accumulated_fees( prev_accumulated_fees + total_fees );
} FC_RETHROW_EXCEPTIONS( warn, "", ("trx_num",trx_num) ) }
void chain_database_impl::pay_delegate( const block_id_type& block_id,
const pending_chain_state_ptr& pending_state,
const public_key_type& block_signee )
{ try {
auto delegate_record = pending_state->get_account_record( self->get_delegate_record_for_signee( block_signee ).id );
FC_ASSERT( delegate_record.valid() && delegate_record->is_delegate() );
const auto pay_percent = delegate_record->delegate_info->pay_rate;
FC_ASSERT( pay_percent <= 100 );
const auto pending_pay = pending_state->get_delegate_pay_rate();
const auto pay = ( pay_percent * pending_pay ) / 100;
const auto prev_accumulated_fees = pending_state->get_accumulated_fees();
pending_state->set_accumulated_fees( prev_accumulated_fees - pay );
//pending_state->set_accumulated_fees( prev_accumulated_fees - pending_pay );
delegate_record->delegate_info->pay_balance += pay;
delegate_record->delegate_info->votes_for += pay;
pending_state->store_account_record( *delegate_record );
auto base_asset_record = pending_state->get_asset_record( asset_id_type(0) );
FC_ASSERT( base_asset_record.valid() );
base_asset_record->current_share_supply -= (pending_pay - pay);
pending_state->store_asset_record( *base_asset_record );
} FC_RETHROW_EXCEPTIONS( warn, "", ("block_id",block_id) ) }
void chain_database_impl::save_undo_state( const block_id_type& block_id,
const pending_chain_state_ptr& pending_state )
{ try {
uint32_t last_checkpoint_block_num = 0;
if( !CHECKPOINT_BLOCKS.empty() )
last_checkpoint_block_num = (--(CHECKPOINT_BLOCKS.end()))->first;
if( _head_block_header.block_num < last_checkpoint_block_num )
return; // don't bother saving it...
pending_chain_state_ptr undo_state = std::make_shared<pending_chain_state>(nullptr);
pending_state->get_undo_state( undo_state );
_undo_state_db.store( block_id, *undo_state );
auto block_num = self->get_head_block_num();
if( int32_t(block_num - BTS_BLOCKCHAIN_MAX_UNDO_HISTORY) > 0 )
{
auto old_id = self->get_block_id( block_num - BTS_BLOCKCHAIN_MAX_UNDO_HISTORY );
try {
_undo_state_db.remove( old_id );
}
catch( const fc::key_not_found_exception& )
{
// ignore this...
}
}
} FC_RETHROW_EXCEPTIONS( warn, "", ("block_id",block_id) ) }
void chain_database_impl::verify_header( const full_block& block_data, const public_key_type& block_signee )
{ try {
// validate preliminaries:
if( block_data.block_num > 1 && block_data.block_num != _head_block_header.block_num + 1 )
FC_CAPTURE_AND_THROW( block_numbers_not_sequential, (block_data)(_head_block_header) );
if( block_data.previous != _head_block_id )
FC_CAPTURE_AND_THROW( invalid_previous_block_id, (block_data)(_head_block_id) );
if( block_data.timestamp.sec_since_epoch() % BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC != 0 )
FC_CAPTURE_AND_THROW( invalid_block_time );
if( block_data.block_num > 1 && block_data.timestamp <= _head_block_header.timestamp )
FC_CAPTURE_AND_THROW( time_in_past, (block_data.timestamp)(_head_block_header.timestamp) );
fc::time_point_sec now = bts::blockchain::now();
auto delta_seconds = (block_data.timestamp - now).to_seconds();
if( block_data.timestamp > (now + BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC*2) )
FC_CAPTURE_AND_THROW( time_in_future, (block_data.timestamp)(now)(delta_seconds) );
digest_block digest_data(block_data);
if( NOT digest_data.validate_digest() )
FC_CAPTURE_AND_THROW( invalid_block_digest );
FC_ASSERT( digest_data.validate_unique() );
// signing delegate:
auto expected_delegate = self->get_slot_signee( block_data.timestamp, self->get_active_delegates() );
if( block_signee != expected_delegate.active_key() )
FC_CAPTURE_AND_THROW( invalid_delegate_signee, (expected_delegate.id) );
} FC_CAPTURE_AND_RETHROW( (block_data) ) }
void chain_database_impl::update_head_block( const full_block& block_data )
{
_head_block_header = block_data;
_head_block_id = block_data.id();
}
/**
* A block should be produced every BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC. If we do not have a
* block for any multiple of this interval between produced_block and the current head block
* then we need to lookup the delegates that should have produced a block during that interval
* and increment their blocks_missed.
*
* We also need to increment the blocks_produced for the delegate that actually produced the
* block.
*
* Note that produced_block has already been verified by the caller and that updates are
* applied to pending_state.
*/
void chain_database_impl::update_delegate_production_info( const full_block& produced_block,
const pending_chain_state_ptr& pending_state,
const public_key_type& block_signee )
{
/* Update production info for signing delegate */
auto delegate_id = self->get_delegate_record_for_signee( block_signee ).id;
auto delegate_record = pending_state->get_account_record( delegate_id );
FC_ASSERT( delegate_record.valid() && delegate_record->is_delegate() );
/* Validate secret */
if( delegate_record->delegate_info->blocks_produced > 0 )
{
auto hash_of_previous_secret = fc::ripemd160::hash( produced_block.previous_secret );
FC_ASSERT( hash_of_previous_secret == delegate_record->delegate_info->next_secret_hash,
"",
("previous_secret",produced_block.previous_secret)
("hash_of_previous_secret",hash_of_previous_secret)
("delegate_record",delegate_record) );
}
delegate_record->delegate_info->blocks_produced += 1;
delegate_record->delegate_info->next_secret_hash = produced_block.next_secret_hash;
delegate_record->delegate_info->last_block_num_produced = produced_block.block_num;
pending_state->store_account_record( *delegate_record );
auto slot = slot_record( produced_block.timestamp, delegate_id, true, produced_block.id() );
pending_state->store_slot_record( slot );
/* Update production info for missing delegates */
auto required_confirmations = pending_state->get_property( confirmation_requirement ).as_int64();
time_point_sec block_timestamp;
auto head_block = self->get_head_block();
if( head_block.block_num > 0 ) block_timestamp = head_block.timestamp + BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC;
else block_timestamp = produced_block.timestamp;
const auto& active_delegates = self->get_active_delegates();
for( ; block_timestamp < produced_block.timestamp;
block_timestamp += BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC,
required_confirmations += 2 )
{
/* Note: Active delegate list has not been updated yet so we can use the timestamp */
delegate_id = self->get_slot_signee( block_timestamp, active_delegates ).id;
delegate_record = pending_state->get_account_record( delegate_id );
FC_ASSERT( delegate_record.valid() && delegate_record->is_delegate() );
delegate_record->delegate_info->blocks_missed += 1;
pending_state->store_account_record( *delegate_record );
pending_state->store_slot_record( slot_record( block_timestamp, delegate_id ) );
}
/* Update required confirmation count */
required_confirmations -= 1;
if( required_confirmations < 1 ) required_confirmations = 1;
if( required_confirmations > BTS_BLOCKCHAIN_NUM_DELEGATES*3 )
required_confirmations = 3*BTS_BLOCKCHAIN_NUM_DELEGATES;
pending_state->set_property( confirmation_requirement, required_confirmations );
}
void chain_database_impl::update_random_seed( const secret_hash_type& new_secret,
const pending_chain_state_ptr& pending_state )
{
auto current_seed = pending_state->get_current_random_seed();
fc::sha512::encoder enc;
fc::raw::pack( enc, new_secret );
fc::raw::pack( enc, current_seed );
pending_state->set_property( last_random_seed_id,
fc::variant(fc::ripemd160::hash( enc.result() )) );
}
void chain_database_impl::update_active_delegate_list( const full_block& block_data,
const pending_chain_state_ptr& pending_state )
{
if( block_data.block_num % BTS_BLOCKCHAIN_NUM_DELEGATES == 0 )
{
// perform a random shuffle of the sorted delegate list.
auto active_del = self->next_round_active_delegates();
auto rand_seed = fc::sha256::hash(self->get_current_random_seed());
size_t num_del = active_del.size();
for( uint32_t i = 0; i < num_del; ++i )
{
for( uint32_t x = 0; x < 4 && i < num_del; ++x, ++i )
std::swap( active_del[i], active_del[rand_seed._hash[x]%num_del] );
rand_seed = fc::sha256::hash(rand_seed);
}
pending_state->set_property( chain_property_enum::active_delegate_list_id, fc::variant(active_del) );
}
}
void chain_database_impl::execute_markets( const fc::time_point_sec& timestamp, const pending_chain_state_ptr& pending_state )
{ try {
const auto pending_block_num = pending_state->get_head_block_num();
//dlog( "execute markets ${e}", ("e", pending_state->get_dirty_markets()) );
map<asset_id_type,share_type> collected_fees;
// TODO: grab market transactions generated by fee payments from pending state...
vector<market_transaction> market_transactions; // = pending_state.market_transactions;
for( const auto& market_pair : pending_state->get_dirty_markets() )
{
FC_ASSERT( market_pair.first > market_pair.second );
if( pending_block_num >= BTSX_MARKET_FORK_6_BLOCK_NUM )
{
market_engine engine( pending_state, *this );
engine.execute( market_pair.first, market_pair.second, timestamp );
market_transactions.insert( market_transactions.end(), engine._market_transactions.begin(), engine._market_transactions.end() );
}
else if( pending_block_num >= BTSX_MARKET_FORK_1_BLOCK_NUM )
{
market_engine_v2 engine( pending_state, *this );
engine.execute( market_pair.first, market_pair.second, timestamp );
market_transactions.insert( market_transactions.end(), engine._market_transactions.begin(), engine._market_transactions.end() );
}
else
{
market_engine_v1 engine( pending_state, *this );
engine.execute( market_pair.first, market_pair.second, timestamp );
market_transactions.insert( market_transactions.end(), engine._market_transactions.begin(), engine._market_transactions.end() );
}
}
//ilog( "market trxs: ${trx}", ("trx", fc::json::to_pretty_string( market_transactions ) ) );
if( pending_block_num < BTSX_MARKET_FORK_2_BLOCK_NUM )
pending_state->set_dirty_markets( pending_state->_dirty_markets );
pending_state->set_market_transactions( std::move( market_transactions ) );
} FC_CAPTURE_AND_RETHROW() }
/**
* Performs all of the block validation steps and throws if error.
*/
void chain_database_impl::extend_chain( const full_block& block_data )
{ try {
auto block_id = block_data.id();
block_summary summary;
try
{
public_key_type block_signee;
if( CHECKPOINT_BLOCKS.size() > 0 && (--CHECKPOINT_BLOCKS.end())->first > block_data.block_num )
//Skip signature validation
block_signee = self->get_slot_signee( block_data.timestamp, self->get_active_delegates() ).active_key();
else
/* We need the block_signee's key in several places and computing it is expensive, so compute it here and pass it down */
block_signee = block_data.signee();
auto checkpoint_itr = CHECKPOINT_BLOCKS.find(block_data.block_num);
if( checkpoint_itr != CHECKPOINT_BLOCKS.end() && checkpoint_itr->second != block_id )
FC_CAPTURE_AND_THROW( failed_checkpoint_verification, (block_id)(checkpoint_itr->second) );
/* Note: Secret is validated later in update_delegate_production_info() */
verify_header( block_data, block_signee );
summary.block_data = block_data;
/* Create a pending state to track changes that would apply as we evaluate the block */
pending_chain_state_ptr pending_state = std::make_shared<pending_chain_state>( self->shared_from_this() );
summary.applied_changes = pending_state;
/** Increment the blocks produced or missed for all delegates. This must be done
* before applying transactions because it depends upon the current active delegate order.
**/
update_delegate_production_info( block_data, pending_state, block_signee );
// apply any deterministic operations such as market operations before we perturb indexes
//apply_deterministic_updates(pending_state);
pay_delegate( block_id, pending_state, block_signee );
if( block_data.block_num < BTSX_MARKET_FORK_2_BLOCK_NUM )
apply_transactions( block_data, pending_state );
execute_markets( block_data.timestamp, pending_state );
if( block_data.block_num >= BTSX_MARKET_FORK_2_BLOCK_NUM )
apply_transactions( block_data, pending_state );
update_active_delegate_list( block_data, pending_state );
update_random_seed( block_data.previous_secret, pending_state );
save_undo_state( block_id, pending_state );
// TODO: verify that apply changes can be called any number of
// times without changing the database other than the first
// attempt.
pending_state->apply_changes();
mark_included( block_id, true );
update_head_block( block_data );
clear_pending( block_data );
_block_num_to_id_db.store( block_data.block_num, block_id );
// self->sanity_check();
}
catch ( const fc::exception& e )
{
wlog( "error applying block: ${e}", ("e",e.to_detail_string() ));
mark_invalid( block_id, e );
throw;
}
//Schedule the observer notifications for later; the chain is in a
//non-premptable state right now, and observers may yield.
if( (now() - block_data.timestamp).to_seconds() < BTS_BLOCKCHAIN_BLOCK_INTERVAL_SEC )
for( chain_observer* o : _observers )
fc::async([o,summary]{o->block_applied( summary );}, "call_block_applied_observer");
} FC_RETHROW_EXCEPTIONS( warn, "", ("block",block_data) ) }
/**
* Traverse the previous links of all blocks in fork until we find one that is_included
*
* The last item in the result will be the only block id that is already included in
* the blockchain.
*/
std::vector<block_id_type> chain_database_impl::get_fork_history( const block_id_type& id )
{ try {
ilog( "" );
std::vector<block_id_type> history;
history.push_back( id );
block_id_type next_id = id;
while( true )
{
auto header = self->get_block_header( next_id );
//ilog( "header: ${h}", ("h",header) );
history.push_back( header.previous );
if( header.previous == block_id_type() )
{
ilog( "return: ${h}", ("h",history) );
return history;
}
auto prev_fork_data = _fork_db.fetch( header.previous );
/// this shouldn't happen if the database invariants are properly maintained
FC_ASSERT( prev_fork_data.is_linked, "we hit a dead end, this fork isn't really linked!" );
if( prev_fork_data.is_included )
{
ilog( "return: ${h}", ("h",history) );
return history;
}
next_id = header.previous;
}
ilog( "${h}", ("h",history) );
return history;
} FC_RETHROW_EXCEPTIONS( warn, "", ("block_id",id) ) }
void chain_database_impl::pop_block()
{ try {
if( _head_block_header.block_num == 0 )
{
wlog( "attempting to pop block 0" );
return;
}
// update the is_included flag on the fork data
mark_included( _head_block_id, false );
// update the block_num_to_block_id index
_block_num_to_id_db.remove( _head_block_header.block_num );
auto previous_block_id = _head_block_header.previous;
bts::blockchain::pending_chain_state_ptr undo_state = std::make_shared<bts::blockchain::pending_chain_state>(_undo_state_db.fetch( _head_block_id ));
undo_state->set_prev_state( self->shared_from_this() );
undo_state->apply_changes();
_head_block_id = previous_block_id;
_head_block_header = self->get_block_header( _head_block_id );
//Schedule the observer notifications for later; the chain is in a
//non-premptable state right now, and observers may yield.
for( chain_observer* o : _observers )
fc::async([o,undo_state]{ o->state_changed( undo_state ); }, "call_state_changed_observer");
} FC_RETHROW_EXCEPTIONS( warn, "" ) }
} // namespace detail
chain_database::chain_database()
:my( new detail::chain_database_impl() )
{
my->self = this;
my->_skip_signature_verification = true;
my->_relay_fee = BTS_BLOCKCHAIN_DEFAULT_RELAY_FEE;
}
chain_database::~chain_database()
{
try
{
close();
}
catch ( const fc::exception& e )
{
wlog( "unexpected exception closing database\n ${e}", ("e",e.to_detail_string() ) );
}
catch ( ... )
{
wlog( "unexpected exception closing database\n" );
}
}
std::vector<account_id_type> chain_database::next_round_active_delegates()const
{
return get_delegates_by_vote( 0, BTS_BLOCKCHAIN_NUM_DELEGATES );
}
/**
* @return the top BTS_BLOCKCHAIN_NUM_DELEGATES by vote
*/
std::vector<account_id_type> chain_database::get_delegates_by_vote(uint32_t first, uint32_t count )const
{ try {
auto del_vote_itr = my->_delegate_vote_index_db.begin();
std::vector<account_id_type> sorted_delegates;
uint32_t pos = 0;
while( sorted_delegates.size() < count && del_vote_itr.valid() )
{