/// <summary>
/// Calls a smart contract function locally on the gateway node.
/// </summary>
/// <remarks>
/// This is performed locally on the gateway node. It cannot change the state of the contract instance
/// (and so, cannot spend anything from the instance's cryptocurrency account). It will not have a
/// consensus timestamp nor a record or a receipt. The response will contain the output returned
/// by the function call.
/// </remarks>
/// <param name="queryParameters">
/// The parameters identifying the contract and function method to call.
/// </param>
/// <param name="configure">
/// Optional callback method providing an opportunity to modify
/// the execution configuration for just this method call.
/// It is executed prior to submitting the request to the network.
/// </param>
/// <returns>
/// The results from the local contract query call.
/// </returns>
/// <exception cref="ArgumentOutOfRangeException">If required arguments are missing.</exception>
/// <exception cref="InvalidOperationException">If required context configuration is missing.</exception>
/// <exception cref="PrecheckException">If the gateway node create rejected the request upon submission.</exception>
public async Task <ContractCallResult> QueryContractAsync(QueryContractParams queryParameters, Action <IContext>?configure = null)
{
queryParameters = RequireInputParameter.QueryParameters(queryParameters);
await using var context = CreateChildContext(configure);
var query = new Query
{
ContractCallLocal = new ContractCallLocalQuery
{
Header = Transactions.CreateAskCostHeader(),
ContractID = Protobuf.ToContractID(queryParameters.Contract),
Gas = queryParameters.Gas,
FunctionParameters = Abi.EncodeFunctionWithArguments(queryParameters.FunctionName, queryParameters.FunctionArgs).ToByteString(),
MaxResultSize = queryParameters.MaxAllowedReturnSize
}
};
var response = await Transactions.ExecuteUnsignedAskRequestWithRetryAsync(context, query, getRequestMethod, getResponseHeader);
long cost = (long)response.ContractCallLocal.Header.Cost;
if (cost > 0)
{
var transactionId = Transactions.GetOrCreateTransactionID(context);
query.ContractCallLocal.Header = await Transactions.CreateAndSignQueryHeaderAsync(context, cost + queryParameters.ReturnValueCharge, transactionId);
response = await Transactions.ExecuteSignedRequestWithRetryAsync(context, query, getRequestMethod, getResponseHeader);
ValidateResult.ResponseHeader(transactionId, getResponseHeader(response));
}
return(Protobuf.FromContractCallResult(response.ContractCallLocal.FunctionResult));
/// <summary>
/// Internal implementation of the contract call method.
/// </summary>
private async Task <TResult> CallContractImplementationAsync <TResult>(CallContractParams callParmeters, Action <IContext>?configure) where TResult : new()
{
callParmeters = RequireInputParameter.CallContractParameters(callParmeters);
var context = CreateChildContext(configure);
var gateway = RequireInContext.Gateway(context);
var payer = RequireInContext.Payer(context);
var transactionId = Transactions.GetOrCreateTransactionID(context);
var transactionBody = Transactions.CreateEmptyTransactionBody(context, transactionId, "Call Contract");
transactionBody.ContractCall = new ContractCallTransactionBody
{
ContractID = Protobuf.ToContractID(callParmeters.Contract),
Gas = callParmeters.Gas,
Amount = callParmeters.PayableAmount,
FunctionParameters = Abi.EncodeFunctionWithArguments(callParmeters.FunctionName, callParmeters.FunctionArgs).ToByteString()
};
var request = Transactions.SignTransaction(transactionBody, payer);
var precheck = await Transactions.ExecuteRequestWithRetryAsync(context, request, getRequestMethod, getResponseCode);
ValidateResult.PreCheck(transactionId, precheck.NodeTransactionPrecheckCode);
var receipt = await GetReceiptAsync(context, transactionId);
if (receipt.Status != ResponseCodeEnum.Success)
{
throw new TransactionException($"Contract call failed, status: {receipt.Status}", Protobuf.FromTransactionId(transactionId), (ResponseCode)receipt.Status);
}
var result = new TResult();
if (result is CallContractRecord rec)
{
var record = await GetTransactionRecordAsync(context, transactionId);
Protobuf.FillRecordProperties(record, rec);
rec.Contract = Protobuf.FromContractID(record.Receipt.ContractID);
rec.CallResult = Protobuf.FromContractCallResult(record.ContractCallResult);
}
else if (result is ContractReceipt rcpt)
{
Protobuf.FillReceiptProperties(transactionId, receipt, rcpt);
rcpt.Contract = Protobuf.FromContractID(receipt.ContractID);
}
return(result);
/// <summary>
/// Calls a smart contract function locally on the gateway node.
/// </summary>
/// <remarks>
/// This is performed locally on the gateway node. It cannot change the state of the contract instance
/// (and so, cannot spend anything from the instance's cryptocurrency account). It will not have a
/// consensus timestamp nor a record or a receipt. The response will contain the output returned
/// by the function call.
/// </remarks>
/// <param name="queryParameters">
/// The parameters identifying the contract and function method to call.
/// </param>
/// <param name="configure">
/// Optional callback method providing an opportunity to modify
/// the execution configuration for just this method call.
/// It is executed prior to submitting the request to the network.
/// </param>
/// <returns>
/// The results from the local contract query call.
/// </returns>
/// <exception cref="ArgumentOutOfRangeException">If required arguments are missing.</exception>
/// <exception cref="InvalidOperationException">If required context configuration is missing.</exception>
/// <exception cref="PrecheckException">If the gateway node create rejected the request upon submission.</exception>
public async Task <ContractCallResult> QueryContractAsync(QueryContractParams queryParameters, Action <IContext>?configure = null)
{
queryParameters = RequireInputParameter.QueryParameters(queryParameters);
var context = CreateChildContext(configure);
var gateway = RequireInContext.Gateway(context);
var payer = RequireInContext.Payer(context);
var transfers = Transactions.CreateCryptoTransferList((payer, -context.FeeLimit), (gateway, context.FeeLimit));
var transactionId = Transactions.GetOrCreateTransactionID(context);
var transactionBody = Transactions.CreateCryptoTransferTransactionBody(context, transfers, transactionId, "Query Contract Local Call");
var query = new Query
{
ContractCallLocal = new ContractCallLocalQuery
{
Header = Transactions.SignQueryHeader(transactionBody, payer),
ContractID = Protobuf.ToContractID(queryParameters.Contract),
Gas = queryParameters.Gas,
FunctionParameters = Abi.EncodeFunctionWithArguments(queryParameters.FunctionName, queryParameters.FunctionArgs).ToByteString(),
MaxResultSize = queryParameters.MaxAllowedReturnSize
}
};
var response = await Transactions.ExecuteRequestWithRetryAsync(context, query, getRequestMethod, getResponseCode);
ValidateResult.PreCheck(transactionId, getResponseCode(response));
return(Protobuf.FromContractCallResult(response.ContractCallLocal.FunctionResult));