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sharding: function to check notary in committee

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Former-commit-id: d46016ebd3bacbb50cbc03084054ce21c9ac9d81 [formerly 6a95cdcdc60bb4dc6a359735f618ed765553095a]
Former-commit-id: 3db9a81c0d2995ff474b3c10b3b87f8f3432a495
This commit is contained in:
Terence Tsao 2018-04-18 17:46:41 -07:00
parent ce9a724556
commit 7107f8fa2b
1 changed files with 21 additions and 18 deletions
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39
sharding/contracts/sharding_manager.sol
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@ -73,7 +73,7 @@ contract SMC {
// The top index of the stack in empty_slots_stack
uint empty_slots_stack_top;
// Notary sampling info to keep sample size unchaged through out period
// Notary sample size at current period and next period
uint current_period_notary_sample_size;
uint next_period_notary_sample_size;
uint sample_size_last_updated_period;
@ -116,23 +116,26 @@ contract SMC {
// Uses a block hash as a seed to pseudorandomly select a signer from the notary pool.
// [TODO] Chance of being selected should be proportional to the notary's deposit.
// Should be able to return a value for the current period or any future period up to.
function get_eligible_notary(uint shard_id, uint period) public view returns(address) {
function is_notary_in_committee(uint shard_id, uint period) public view returns(bool) {
uint current_period = block.number / PERIOD_LENGTH;
uint period_to_look = ((period - LOOKAHEAD_LENGTH) * PERIOD_LENGTH);
require(period >= current_period);
require(period <= (current_period + LOOKAHEAD_LENGTH));
require(notary_pool_len > 0);
if (period <= LOOKAHEAD_LENGTH)
period_to_look = period;
require(period_to_look < block.number);
return notary_pool[uint(
keccak256(
block.blockhash(period_to_look),
shard_id
)
) %
notary_pool_len
];
// Determine notary pool length based on notary sample size
uint sample_size;
if (period > sample_size_last_updated_period) {
sample_size = next_period_notary_sample_size;
} else {
sample_size = current_period_notary_sample_size;
}
uint period_to_look = period * PERIOD_LENGTH - 1;
for (uint i = 1; i <= QUORUM_SIZE; i++) {
uint index = uint(keccak256(block.blockhash(period_to_look), index)) % sample_size;
if (notary_pool[index] == msg.sender) {
return true;
}
}
return false;
}
function compute_header_hash(uint256 shard_id,
@ -214,7 +217,7 @@ contract SMC {
return true;
}
function update_notary_sample_size() returns(bool) {
function update_notary_sample_size() private returns(bool) {
uint current_period = block.number / PERIOD_LENGTH;
require(current_period < sample_size_last_updated_period);