public static async Task <MaticTransactionOptions> GetTransactionEstimate(ERC20TransferModel transferModel, MaticTransactionOptions options, Function function)
{
try
{
//Get the Account
Account account = GetAccount(options.SenderPrivateKey, options.ChainId);
//Get the Gas Limit
HexBigInteger gasLimit = await function.EstimateGasAsync(account.Address, null, null, transferModel.To, transferModel.Value);
//Get the Gas Price Estimate
GasPriceEstimator gasPriceEstimator = new GasPriceEstimator();
GasPriceEstimate gasPriceEstimate = await gasPriceEstimator.GetRecommendedGasPriceFromNetwork();
//Fill the options
options.GasPrice = (decimal)gasPriceEstimate.AverageGwei;
options.GasLimit = gasLimit;
options.From = account.Address;
return(options);
}catch (Exception ex)
{
throw new Exception("Could not fetch transaction estimate because " + ex.Message);
}
}
/// <summary>
/// The transfer function is used to Perform Transfers from one Address to another
/// </summary>
/// <param name="from">Source Address and Signer</param>
/// <param name="To">Destination Address</param>
/// <param name="Value">The Amount (In wei) of tokens to be transfered</param>
/// <returns></returns>
public async Task <string> Transfer(ERC20TransferModel transferModel, MaticTransactionOptions options)
{
//Get the Contract instance by Creating a Web3 client from the Sender's Private Key
Web3 web3Client = Web3ClientHelper.GetWeb3Client(ProviderUrl, options.SenderPrivateKey);
Contract contractInstance = web3Client.Eth.GetContract(ABI, ContractAddress);
Function function = contractInstance.GetFunction("transfer");
//Fill the options
options = await TransactionEstimateHelper.GetTransactionEstimate(transferModel, options, function);
string response = await function.SendTransactionAsync(options.From, new HexBigInteger(options.GasLimit), new HexBigInteger(options.GasPrice.ToString()), null, transferModel.To, (BigInteger)transferModel.Value);
return(response);
}
/// <summary>
/// The transfer function is used to Perform Transfers from one Address to another
/// </summary>
/// <param name="tokenAddress">Source Address and Signer</param>
/// <param name="userAddress">Address of the reciepient</param>
/// <param name="amount">The Amount (In wei) of tokens to be transfered to the reciepient</param>
/// <param name="options">Matic Transaction Options</param>
/// <returns></returns>
public async Task <string> TransferTokens(string tokenAddress, string userAddress, BigInteger amount, MaticTransactionOptions options)
{
//check if the options are correctly set
if ((options != null) && (String.IsNullOrEmpty(options.From) || String.IsNullOrEmpty(tokenAddress) || amount == null))
{
throw new Exception("Parameters required for the transaction on Matic Network are missing");
}
//If the Private Key was not sent in the options assign the one set in the wallet. If both are null, throw an exception
if (string.IsNullOrEmpty(options.SenderPrivateKey))
{
options.SenderPrivateKey = Wallet;
}
if (String.IsNullOrEmpty(options.SenderPrivateKey))
{
throw new Exception("Please provide the private Key first, using 'Matic.Wallet = <PrivateKey>'");
}
string web3Provider = MaticProvider;
//Set The web3 Object to the Parent Web3 Object if UseParent is set to true
if (options.UseParent)
{
web3Provider = ParentProvider;
}
//Get the contract using the token Address
ERC20TokenContract erc20TokenContract = new ERC20TokenContract(web3Provider, tokenAddress);
//Make the Transfer
ERC20TransferModel transferModel = new ERC20TransferModel()
{
To = userAddress,
Value = new HexBigInteger(amount)
};
string response = await erc20TokenContract.Transfer(transferModel, options);
return(response);
}