f7980f5252
The functionality is equivalent, but it now uses a separate witness_schedule_object, and the code now lives in db_witness_schedule.cpp.
120 lines
4.8 KiB
C++
120 lines
4.8 KiB
C++
/*
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* Copyright (c) 2015, Cryptonomex, Inc.
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* All rights reserved.
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*
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* This source code is provided for evaluation in private test networks only, until September 8, 2015. After this date, this license expires and
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* the code may not be used, modified or distributed for any purpose. Redistribution and use in source and binary forms, with or without modification,
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* are permitted until September 8, 2015, provided that the following conditions are met:
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*
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* 1. The code and/or derivative works are used only for private test networks consisting of no more than 10 P2P nodes.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <graphene/chain/database.hpp>
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#include <graphene/chain/global_property_object.hpp>
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#include <graphene/chain/witness_object.hpp>
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#include <graphene/chain/witness_schedule_object.hpp>
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namespace graphene { namespace chain {
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using boost::container::flat_set;
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witness_id_type database::get_scheduled_witness( uint32_t slot_num )const
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{
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const dynamic_global_property_object& dpo = get_dynamic_global_properties();
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const witness_schedule_object& wso = witness_schedule_id_type()(*this);
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uint64_t current_aslot = dpo.current_aslot + slot_num;
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return wso.current_shuffled_witnesses[ current_aslot % wso.current_shuffled_witnesses.size() ];
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}
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fc::time_point_sec database::get_slot_time(uint32_t slot_num)const
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{
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if( slot_num == 0 )
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return fc::time_point_sec();
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auto interval = block_interval();
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const dynamic_global_property_object& dpo = get_dynamic_global_properties();
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if( head_block_num() == 0 )
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{
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// n.b. first block is at genesis_time plus one block interval
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fc::time_point_sec genesis_time = dpo.time;
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return genesis_time + slot_num * interval;
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}
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auto head_block_abs_slot = head_block_time().sec_since_epoch() / interval;
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fc::time_point_sec head_slot_time(head_block_abs_slot * interval);
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const global_property_object& gpo = get_global_properties();
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// "slot 0" is head_slot_time
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// "slot 1" is head_slot_time,
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// plus maint interval if head block is a maint block
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// plus block interval if head block is not a maint block
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return head_slot_time
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+ (slot_num +
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(
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(dpo.dynamic_flags & dynamic_global_property_object::maintenance_flag)
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? gpo.parameters.maintenance_skip_slots : 0
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)
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) * interval
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;
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}
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uint32_t database::get_slot_at_time(fc::time_point_sec when)const
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{
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fc::time_point_sec first_slot_time = get_slot_time( 1 );
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if( when < first_slot_time )
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return 0;
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return (when - first_slot_time).to_seconds() / block_interval() + 1;
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}
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uint32_t database::witness_participation_rate()const
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{
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const dynamic_global_property_object& dpo = get_dynamic_global_properties();
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return uint64_t(GRAPHENE_100_PERCENT) * dpo.recent_slots_filled.popcount() / 128;
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}
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void database::update_witness_schedule()
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{
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const witness_schedule_object& wso = witness_schedule_id_type()(*this);
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const global_property_object& gpo = get_global_properties();
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if( head_block_num() % gpo.active_witnesses.size() == 0 )
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{
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modify( wso, [&]( witness_schedule_object& _wso )
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{
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_wso.current_shuffled_witnesses.clear();
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_wso.current_shuffled_witnesses.reserve( gpo.active_witnesses.size() );
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for( const witness_id_type& w : gpo.active_witnesses )
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_wso.current_shuffled_witnesses.push_back( w );
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auto now_hi = uint64_t(head_block_time().sec_since_epoch()) << 32;
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for( uint32_t i = 0; i < _wso.current_shuffled_witnesses.size(); ++i )
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{
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/// High performance random generator
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/// http://xorshift.di.unimi.it/
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uint64_t k = now_hi + uint64_t(i)*2685821657736338717ULL;
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k ^= (k >> 12);
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k ^= (k << 25);
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k ^= (k >> 27);
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k *= 2685821657736338717ULL;
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uint32_t jmax = _wso.current_shuffled_witnesses.size() - i;
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uint32_t j = i + k%jmax;
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std::swap( _wso.current_shuffled_witnesses[i],
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_wso.current_shuffled_witnesses[j] );
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}
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});
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}
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}
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} }
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