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Merge pull request #1219 from ethereum/sharding/propose-attestations
Sharding/propose attestations
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99 changes: 99 additions & 0 deletions
99
...mj-core/src/main/java/org/ethereum/sharding/processing/consensus/MaximumVotesAsScore.java
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| /* | ||
| * Copyright (c) [2016] [ <ether.camp> ] | ||
| * This file is part of the ethereumJ library. | ||
| * | ||
| * The ethereumJ library is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * The ethereumJ library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public License | ||
| * along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.ethereum.sharding.processing.consensus; | ||
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|
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| import org.ethereum.db.ByteArrayWrapper; | ||
| import org.ethereum.sharding.domain.Beacon; | ||
| import org.ethereum.sharding.processing.db.BeaconStore; | ||
| import org.ethereum.sharding.processing.state.ActiveState; | ||
| import org.ethereum.sharding.processing.state.AttestationRecord; | ||
| import org.ethereum.sharding.processing.state.BeaconState; | ||
| import org.ethereum.sharding.util.Bitfield; | ||
|
|
||
| import java.math.BigInteger; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.stream.Collectors; | ||
|
|
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| /** | ||
| * Score uses IMD GHOST algorithm combined with finality | ||
| * For more info check following pages: | ||
| * - https://ethresear.ch/t/immediate-message-driven-ghost-as-ffg-fork-choice-rule/2561 | ||
| * - https://ethresear.ch/t/beacon-chain-casper-ffg-rpj-mini-spec/2760 | ||
| */ | ||
| public class MaximumVotesAsScore implements ScoreFunction { | ||
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| BeaconStore store; | ||
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| public MaximumVotesAsScore(BeaconStore store) { | ||
| this.store = store; | ||
| } | ||
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| @Override | ||
| public BigInteger apply(Beacon block, BeaconState state) { | ||
| ActiveState activeState = state.getActiveState(); | ||
|
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| // Assumes that data from block is already in active state | ||
| List<AttestationRecord> pendingAttestations = activeState.getPendingAttestations(); | ||
| AttestationRecord first = block.getAttestations().get(0); | ||
| boolean found = false; | ||
| for (int i = pendingAttestations.size() - 1; i >= 0; --i) { | ||
| if (pendingAttestations.get(i).equals(first)) { | ||
| found = true; | ||
| } | ||
| } | ||
| if (!found) { | ||
| throw new RuntimeException("State should already include scored block"); | ||
| } | ||
|
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| long lastJustified = state.getCrystallizedState().getFinality().getLastJustifiedSlot(); | ||
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| // Calculate per block votes | ||
| Map<ByteArrayWrapper, List<AttestationRecord>> perBlockAttestations = new HashMap<>(); | ||
| pendingAttestations.forEach(at -> { | ||
| ByteArrayWrapper blockHash = new ByteArrayWrapper(at.getShardBlockHash()); | ||
| if (perBlockAttestations.containsKey(blockHash)) { | ||
| perBlockAttestations.get(blockHash).add(at); | ||
| } else { | ||
| perBlockAttestations.put(blockHash, new ArrayList<AttestationRecord>(){{add(at);}}); | ||
| } | ||
| }); | ||
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| int maxVotes = 0; | ||
| Beacon current = block; | ||
| while (current.getSlotNumber() != lastJustified) { | ||
| int currentVotes = 0; | ||
| List<AttestationRecord> blockAttestations = perBlockAttestations.get(new ByteArrayWrapper(current.getHash())); | ||
| if (blockAttestations != null && !blockAttestations.isEmpty()) { | ||
| currentVotes = Bitfield.orBitfield( | ||
| blockAttestations.stream() | ||
| .map(at -> at.getAttesterBitfield()) | ||
| .collect(Collectors.toList()) | ||
| ).calcVotes(); | ||
| } | ||
| if (currentVotes > maxVotes) { | ||
| maxVotes = currentVotes; | ||
| } | ||
| current = store.getByHash(current.getParentHash()); | ||
| } | ||
|
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| return BigInteger.valueOf(maxVotes); | ||
| } | ||
| } |
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