public virtual IEnumerable <ECPoint> GetValidators(IEnumerable <Transaction> others)
{
DataCache <UInt160, AccountState> accounts = GetStates <UInt160, AccountState>();
DataCache <ECPoint, ValidatorState> validators = GetStates <ECPoint, ValidatorState>();
MetaDataCache <ValidatorsCountState> validators_count = GetMetaData <ValidatorsCountState>();
foreach (Transaction tx in others)
{
foreach (TransactionOutput output in tx.Outputs)
{
AccountState account = accounts.GetAndChange(output.ScriptHash, () => new AccountState(output.ScriptHash));
if (account.Balances.ContainsKey(output.AssetId))
{
account.Balances[output.AssetId] += output.Value;
}
else
{
account.Balances[output.AssetId] = output.Value;
}
if (output.AssetId.Equals(GoverningToken.Hash) && account.Votes.Length > 0)
{
foreach (ECPoint pubkey in account.Votes)
{
validators.GetAndChange(pubkey, () => new ValidatorState(pubkey)).Votes += output.Value;
}
validators_count.GetAndChange().Votes[account.Votes.Length - 1] += output.Value;
}
}
foreach (var group in tx.Inputs.GroupBy(p => p.PrevHash))
{
Transaction tx_prev = GetTransaction(group.Key, out int height);
foreach (CoinReference input in group)
{
TransactionOutput out_prev = tx_prev.Outputs[input.PrevIndex];
AccountState account = accounts.GetAndChange(out_prev.ScriptHash);
if (out_prev.AssetId.Equals(GoverningToken.Hash))
{
if (account.Votes.Length > 0)
{
foreach (ECPoint pubkey in account.Votes)
{
ValidatorState validator = validators.GetAndChange(pubkey);
validator.Votes -= out_prev.Value;
if (!validator.Registered && validator.Votes.Equals(Fixed8.Zero))
{
validators.Delete(pubkey);
}
}
validators_count.GetAndChange().Votes[account.Votes.Length - 1] -= out_prev.Value;
}
}
account.Balances[out_prev.AssetId] -= out_prev.Value;
}
}
switch (tx)
{
#pragma warning disable CS0612
case EnrollmentTransaction tx_enrollment:
validators.GetAndChange(tx_enrollment.PublicKey, () => new ValidatorState(tx_enrollment.PublicKey)).Registered = true;
break;
#pragma warning restore CS0612
case StateTransaction tx_state:
foreach (StateDescriptor descriptor in tx_state.Descriptors)
{
switch (descriptor.Type)
{
case StateType.Account:
ProcessAccountStateDescriptor(descriptor, accounts, validators, validators_count);
break;
case StateType.Validator:
ProcessValidatorStateDescriptor(descriptor, validators);
break;
}
}
break;
}
}
int count = (int)validators_count.Get().Votes.Select((p, i) => new
{
Count = i,
Votes = p
}).Where(p => p.Votes > Fixed8.Zero).ToArray().WeightedFilter(0.25, 0.75, p => p.Votes.GetData(), (p, w) => new
{
p.Count,
Weight = w
}).WeightedAverage(p => p.Count, p => p.Weight);
count = Math.Max(count, StandbyValidators.Length);
HashSet <ECPoint> sv = new HashSet <ECPoint>(StandbyValidators);
ECPoint[] pubkeys = validators.Find().Select(p => p.Value).Where(p => (p.Registered && p.Votes > Fixed8.Zero) || sv.Contains(p.PublicKey)).OrderByDescending(p => p.Votes).ThenBy(p => p.PublicKey).Select(p => p.PublicKey).Take(count).ToArray();
IEnumerable <ECPoint> result;
if (pubkeys.Length == count)
{
result = pubkeys;
}
else
{
HashSet <ECPoint> hashSet = new HashSet <ECPoint>(pubkeys);
for (int i = 0; i < StandbyValidators.Length && hashSet.Count < count; i++)
{
hashSet.Add(StandbyValidators[i]);
}
result = hashSet;
}
return(result.OrderBy(p => p));
}