private bool CheckValidators(ApplicationEngine engine)
{
UInt256 prev_hash = engine.Snapshot.PersistingBlock.PrevHash;
TrimmedBlock prev_block = engine.Snapshot.Blocks[prev_hash];
return(InteropService.CheckWitness(engine, prev_block.NextConsensus));
}
private StackItem Vote(ApplicationEngine engine, VMArray args)
{
UInt160 account = new UInt160(args[0].GetByteArray());
ECPoint[] pubkeys = ((VMArray)args[1]).Select(p => p.GetByteArray().AsSerializable <ECPoint>()).ToArray();
if (!InteropService.CheckWitness(engine, account))
{
return(false);
}
StorageKey key_account = CreateAccountKey(account);
if (engine.Snapshot.Storages.TryGet(key_account) is null)
{
return(false);
}
StorageItem storage_account = engine.Snapshot.Storages.GetAndChange(key_account);
AccountState state_account = new AccountState(storage_account.Value);
foreach (ECPoint pubkey in state_account.Votes)
{
StorageItem storage_validator = engine.Snapshot.Storages.GetAndChange(CreateStorageKey(Prefix_Validator, pubkey.ToArray()));
ValidatorState state_validator = ValidatorState.FromByteArray(storage_validator.Value);
state_validator.Votes -= state_account.Balance;
storage_validator.Value = state_validator.ToByteArray();
}
pubkeys = pubkeys.Distinct().Where(p => engine.Snapshot.Storages.TryGet(CreateStorageKey(Prefix_Validator, p.ToArray())) != null).ToArray();
if (pubkeys.Length != state_account.Votes.Length)
{
StorageItem storage_count = engine.Snapshot.Storages.GetAndChange(CreateStorageKey(Prefix_ValidatorsCount), () => new StorageItem
{
Value = new ValidatorsCountState().ToByteArray()
});
ValidatorsCountState state_count = ValidatorsCountState.FromByteArray(storage_count.Value);
if (state_account.Votes.Length > 0)
{
state_count.Votes[state_account.Votes.Length - 1] -= state_account.Balance;
}
if (pubkeys.Length > 0)
{
state_count.Votes[pubkeys.Length - 1] += state_account.Balance;
}
storage_count.Value = state_count.ToByteArray();
}
state_account.Votes = pubkeys;
storage_account.Value = state_account.ToByteArray();
foreach (ECPoint pubkey in state_account.Votes)
{
StorageItem storage_validator = engine.Snapshot.Storages.GetAndChange(CreateStorageKey(Prefix_Validator, pubkey.ToArray()));
ValidatorState state_validator = ValidatorState.FromByteArray(storage_validator.Value);
state_validator.Votes += state_account.Balance;
storage_validator.Value = state_validator.ToByteArray();
}
return(true);
}
protected virtual bool Transfer(ApplicationEngine engine, UInt160 from, UInt160 to, BigInteger amount)
{
if (amount.Sign < 0)
{
throw new ArgumentOutOfRangeException(nameof(amount));
}
if (!from.Equals(engine.CallingScriptHash) && !InteropService.CheckWitness(engine, from))
{
return(false);
}
ContractState contract_to = engine.Snapshot.Contracts.TryGet(to);
if (contract_to?.Payable == false)
{
return(false);
}
StorageKey key_from = CreateAccountKey(from);
StorageItem storage_from = engine.Snapshot.Storages.TryGet(key_from);
if (amount.IsZero)
{
if (storage_from != null)
{
TState state_from = new TState();
state_from.FromByteArray(storage_from.Value);
OnBalanceChanging(engine, from, state_from, amount);
}
}
else
{
if (storage_from is null)
{
return(false);
}
TState state_from = new TState();
state_from.FromByteArray(storage_from.Value);
if (state_from.Balance < amount)
{
return(false);
}
if (from.Equals(to))
{
OnBalanceChanging(engine, from, state_from, BigInteger.Zero);
}
else
{
OnBalanceChanging(engine, from, state_from, -amount);
if (state_from.Balance == amount)
{
engine.Snapshot.Storages.Delete(key_from);
}
else
{
state_from.Balance -= amount;
storage_from = engine.Snapshot.Storages.GetAndChange(key_from);
storage_from.Value = state_from.ToByteArray();
}
StorageKey key_to = CreateAccountKey(to);
StorageItem storage_to = engine.Snapshot.Storages.GetAndChange(key_to, () => new StorageItem
{
Value = new TState().ToByteArray()
});
TState state_to = new TState();
state_to.FromByteArray(storage_to.Value);
OnBalanceChanging(engine, to, state_to, amount);
state_to.Balance += amount;
storage_to.Value = state_to.ToByteArray();
}
}
engine.SendNotification(Hash, new Array(engine.ReferenceCounter, new StackItem[] { "Transfer", from.ToArray(), to.ToArray(), amount }));
return(true);
}
