internal bool Invoke(ApplicationEngine engine)
{
if (!engine.CurrentScriptHash.Equals(Hash))
{
return(false);
}
if (!engine.TryPop(out string operation))
{
return(false);
}
if (!engine.TryPop(out Array args))
{
return(false);
}
if (!methods.TryGetValue(operation, out ContractMethodMetadata method))
{
return(false);
}
ExecutionContextState state = engine.CurrentContext.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
return(false);
}
if (!engine.AddGas(method.Price))
{
return(false);
}
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
StackItem item = i < args.Count ? args[i] : StackItem.Null;
parameters.Add(engine.Convert(item, method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
engine.Push(engine.Convert(returnValue));
}
return(true);
}
internal async void Invoke(ApplicationEngine engine, byte version)
{
try
{
if (version != 0)
{
throw new InvalidOperationException($"The native contract of version {version} is not active.");
}
ExecutionContext context = engine.CurrentContext;
ContractMethodMetadata method = methods[context.InstructionPointer];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.CpuFee * Policy.GetExecFeeFactor(engine.Snapshot) + method.StorageFee * Policy.GetStoragePrice(engine.Snapshot));
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
parameters.Add(engine.Convert(context.EvaluationStack.Pop(), method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (returnValue is ContractTask task)
{
await task;
returnValue = task.GetResult();
}
if (method.Handler.ReturnType != typeof(void) && method.Handler.ReturnType != typeof(ContractTask))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}
catch (Exception ex)
{
engine.Throw(ex);
}
}
internal void Invoke(ApplicationEngine engine, byte version)
{
if (ActiveBlockIndex > Ledger.CurrentIndex(engine.Snapshot))
{
throw new InvalidOperationException($"The native contract {Name} is not active.");
}
if (version != 0)
{
throw new InvalidOperationException($"The native contract of version {version} is not active.");
}
ExecutionContext context = engine.CurrentContext;
ContractMethodMetadata method = methods[context.InstructionPointer];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.Price);
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
parameters.Add(engine.Convert(context.EvaluationStack.Pop(), method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}
internal void Invoke(ApplicationEngine engine)
{
if (!engine.CurrentScriptHash.Equals(Hash))
{
throw new InvalidOperationException("It is not allowed to use Neo.Native.Call directly to call native contracts. System.Contract.Call should be used.");
}
ExecutionContext context = engine.CurrentContext;
string operation = context.EvaluationStack.Pop().GetString();
Array args = context.EvaluationStack.Pop <Array>();
ContractMethodMetadata method = methods[operation];
ExecutionContextState state = context.GetState <ExecutionContextState>();
if (!state.CallFlags.HasFlag(method.RequiredCallFlags))
{
throw new InvalidOperationException($"Cannot call this method with the flag {state.CallFlags}.");
}
engine.AddGas(method.Price);
List <object> parameters = new List <object>();
if (method.NeedApplicationEngine)
{
parameters.Add(engine);
}
if (method.NeedSnapshot)
{
parameters.Add(engine.Snapshot);
}
for (int i = 0; i < method.Parameters.Length; i++)
{
StackItem item = i < args.Count ? args[i] : StackItem.Null;
parameters.Add(engine.Convert(item, method.Parameters[i]));
}
object returnValue = method.Handler.Invoke(this, parameters.ToArray());
if (method.Handler.ReturnType != typeof(void))
{
context.EvaluationStack.Push(engine.Convert(returnValue));
}
}