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sharding: notary casts votes

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Former-commit-id: 8c0007eaf2de0d36c69ea346f85234dee6af89ee [formerly c9ed2d6063398edf0734a6d48a6cc88b6afd637b]
Former-commit-id: f508bacaab3632fa4d3d05c26eea3c6b155c2ab1
This commit is contained in:
Terence Tsao 2018-04-30 17:31:44 -07:00
parent 668bbc7478
commit 3b7c5bf64c
1 changed files with 28 additions and 10 deletions
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38
sharding/contracts/sharding_manager.sol
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@ -6,6 +6,7 @@ contract SMC {
event NotaryRegistered(address notary, uint poolIndex);
event NotaryDeregistered(address notary, uint poolIndex, uint deregisteredPeriod);
event NotaryReleased(address notary, uint poolIndex);
event Voted(uint indexed shardId, bytes32 chunkRoot, uint period, address notaryAddress);
struct Notary {
uint deregisteredPeriod;
@ -49,6 +50,9 @@ contract SMC {
uint sampleSizeLastUpdatedPeriod;
// Constant values
uint constant ONE = 1;
uint constant ONES = 255;
uint constant LAST_BYTE = 31;
uint constant PERIOD_LENGTH = 5;
// Number of shards
uint constant SHARD_COUNT = 100;
@ -172,7 +176,8 @@ contract SMC {
collationRecords[_shardId][_period] = CollationRecord({
chunkRoot: _chunkRoot,
proposer: msg.sender
proposer: msg.sender,
isElected: false
});
lastSubmittedCollation[_shardId] = block.number / PERIOD_LENGTH;
@ -181,7 +186,7 @@ contract SMC {
}
/// Sampled notary can call the following funtion to submit vote,
/// a vote log will be emitted which client will monitor
/// a vote log will be emitted for client to monitor
function submitVote(
uint _shardId,
uint _period,
@ -193,6 +198,12 @@ contract SMC {
require(!hasVoted(_shardId, _index));
require(getNotaryInCommittee(_shardId, _index) == msg.sender);
uint8 voteCount = castVote(_shardId, _index);
if (voteCount >= QUORUM_SIZE) {
lastApprovedCollation[_shardId] = _period;
collationRecords[_shardId][_period].isElected = true;
}
emit Voted(_shardId, _chunkRoot, _period, msg.sender);
}
/// To keep track of notary size in between periods, we call updateNotarySampleSize
@ -228,13 +239,20 @@ contract SMC {
return emptySlotsStack[emptySlotsStackTop];
}
/// Check if a bit is set from a given byte, this function is used to check
/// Check if a bit is set, this function is used to check
/// if a notary has casted the vote, return true if voted, false if not
function hasVoted(uint _shardId, uint _index) internal returns (bool) {
uint byteIndex = _index / 8;
uint bitIndex = _index % 8;
byte _byte = currentVote[_shardId][byteIndex];
byte bitPos = byte(2 ** (7 - bitIndex));
return (_byte & bitPos) == bitPos;
}
}
return currentVote[_shardId] & bytes32(ONE << uint(ONES - _index)) == bytes32(ONE << uint(ONES - _index));
}
/// Set a bit to one, notary uses this function to cast it's vote,
/// After the notary casts it's vote, we increase the vote count by 1 (last byte)
/// Returns the total numbers of votes
function castVote(uint _shardId, uint _index) internal returns (uint8) {
currentVote[_shardId] = currentVote[_shardId] | bytes32(ONE << (ONES - _index));
uint8 voteCount = uint8(currentVote[_shardId][LAST_BYTE]) + 1;
bytes32 mask = bytes32(0xff);
currentVote[_shardId] = (currentVote[_shardId] & ~mask) | bytes32(voteCount);
return voteCount;
}
}