public static bool Transfer(this NativeContract contract, Persistence.Snapshot snapshot, byte[] from, byte[] to, BigInteger amount, bool signFrom)
{
var engine = new ApplicationEngine(TriggerType.Application,
new ManualWitness(signFrom ? new[] { new UInt160(from) } : null), snapshot, 0, true);
engine.LoadScript(contract.Script);
var script = new ScriptBuilder();
script.EmitPush(amount);
script.EmitPush(to);
script.EmitPush(from);
script.EmitPush(3);
script.Emit(OpCode.PACK);
script.EmitPush("transfer");
engine.LoadScript(script.ToArray());
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
var result = engine.ResultStack.Pop();
result.Should().BeOfType(typeof(VM.Types.Boolean));
return((result as VM.Types.Boolean).GetBoolean());
}
public static StackItem Call(this NativeContract contract, Persistence.Snapshot snapshot, IVerifiable container, string method, params ContractParameter[] args)
{
var engine = new ApplicationEngine(TriggerType.Application, container, snapshot, 0, true);
engine.LoadScript(contract.Script);
var script = new ScriptBuilder();
for (var i = args.Length - 1; i >= 0; i--)
{
script.EmitPush(args[i]);
}
script.EmitPush(args.Length);
script.Emit(OpCode.PACK);
script.EmitPush(method);
engine.LoadScript(script.ToArray());
if (engine.Execute() != VMState.HALT)
{
throw new InvalidOperationException();
}
return(engine.ResultStack.Pop());
}
public static Coin[] checkUtxo(Coin[] unspentsAsset)
{
List <Coin> unspents = unspentsAsset.ToList();
foreach (var item in unspentsAsset)
{
Transaction preTx = Blockchain.Singleton.GetTransaction(item.Reference.PrevHash);
TransactionAttribute[] attribute = preTx.Attributes;
using (Persistence.Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
{
foreach (TransactionAttribute att in attribute)
{
if (att.Usage == TransactionAttributeUsage.SmartContractScript)
{
BinaryReader OpReader = new BinaryReader(new MemoryStream(att.Data, false));
List <int> changeNum = ParseIndexList(OpReader);
if (!changeNum.Contains(item.Reference.PrevIndex))
{
using (ApplicationEngine engine = new ApplicationEngine(TriggerType.Verification, null, snapshot, Fixed8.Zero))
{
engine.LoadScript(OpReader.ReadBytes(OpReader.ReadByte()));
if (!engine.Execute() || engine.ResultStack.Count != 1 || !engine.ResultStack.Pop().GetBoolean())
{
unspents.Remove(item);
}
}
}
}
}
}
}
return(unspents.ToArray());
}
public static BigInteger TotalSupply(this NativeContract contract, Persistence.Snapshot snapshot)
{
var engine = new ApplicationEngine(TriggerType.Application, null, snapshot, 0, true);
engine.LoadScript(contract.Script);
var script = new ScriptBuilder();
script.EmitPush(0);
script.Emit(OpCode.PACK);
script.EmitPush("totalSupply");
engine.LoadScript(script.ToArray());
engine.Execute().Should().Be(VMState.HALT);
var result = engine.ResultStack.Pop();
result.Should().BeOfType(typeof(VM.Types.Integer));
return((result as VM.Types.Integer).GetBigInteger());
}
public UInt160[] GetScriptHashesForVerifying(Persistence.Snapshot snapshot) => _hashForVerify;
public UInt160[] GetScriptHashesForVerifying(Persistence.Snapshot snapshot)
{
return(_hashForVerify);
}
public UInt160 GetScriptHashForVerification(Persistence.Snapshot snapshot)
{
return(_hashForVerify);
}
public static StackItem Call(this NativeContract contract, Persistence.Snapshot snapshot, string method, params ContractParameter[] args)
{
return(Call(contract, snapshot, null, method, args));
}
public static Coin[] checkUtxo(Coin[] unspentsAsset)
{
List <Coin> unspents = unspentsAsset.ToList();
foreach (var item in unspentsAsset)
{
Transaction preTx = Blockchain.Singleton.GetTransaction(item.Reference.PrevHash);
TransactionAttribute[] attribute = preTx.Attributes;
using (Persistence.Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
{
foreach (TransactionAttribute att in attribute)
{
if (att.Usage == TransactionAttributeUsage.SmartContractScript)
{
int n = -1;
System.IO.BinaryReader OpReader = new System.IO.BinaryReader(new System.IO.MemoryStream(att.Data, false));
OpCode opcode = (OpCode)OpReader.ReadByte();
switch (opcode)
{
case OpCode.PUSH0:
break;
case OpCode.PUSHDATA1:
n = BitConverter.ToInt16(OpReader.ReadBytes(OpReader.ReadByte()), 0);
break;
case OpCode.PUSHDATA2:
n = BitConverter.ToInt16(OpReader.ReadBytes(OpReader.ReadUInt16()), 0);
break;
case OpCode.PUSHDATA4:
n = BitConverter.ToInt32(OpReader.ReadBytes((int)OpReader.ReadUInt32()), 0);
break;
case OpCode.PUSHM1:
case OpCode.PUSH1:
case OpCode.PUSH2:
case OpCode.PUSH3:
case OpCode.PUSH4:
case OpCode.PUSH5:
case OpCode.PUSH6:
case OpCode.PUSH7:
case OpCode.PUSH8:
case OpCode.PUSH9:
case OpCode.PUSH10:
case OpCode.PUSH11:
case OpCode.PUSH12:
case OpCode.PUSH13:
case OpCode.PUSH14:
case OpCode.PUSH15:
case OpCode.PUSH16:
n = (int)opcode - (int)OpCode.PUSH1 + 1;
break;
}
if (item.Reference.PrevIndex != n)
{
using (ApplicationEngine engine = new ApplicationEngine(TriggerType.Verification, null, snapshot, Fixed8.Zero))
{
engine.LoadScript(OpReader.ReadBytes(OpReader.ReadByte()));
if (!engine.Execute() || engine.ResultStack.Count != 1 || !engine.ResultStack.Pop().GetBoolean())
{
unspents.Remove(item);
}
}
}
}
}
}
}
return(unspents.ToArray());
}
