public async Task <string> getQuestionTextByRow(string questionId, int questionTextRow)
{
var contract = web3.Eth.GetContract(abi, contractAddress);
var function = contract.GetFunction("getQuestionTextByRow");
object[] param = new object[2];
param[0] = questionId;
param[1] = questionTextRow;
QuestionText result = await function.CallDeserializingToObjectAsync <QuestionText>(param);
string s = HexStringUTF8ConvertorExtensions.HexToUTF8String(result.textLine.ToHex());
return(s);
}
// Array request, string service, Action<string> callback, string callbackUrl
public async Task <Texture2D> SendTransaction()
{
// Uri for transaction
string baseRequestUri = "meta://transaction?", trxRequestUri = "";
// URI for to, value, data
baseRequestUri += "t=" + to + "&v=" + HexBigIntegerConvertorExtensions.ToHex(value, true) + "&d=" + HexStringUTF8ConvertorExtensions.ToHexUTF8(data);
// URI for usage
baseRequestUri += "&u=" + usage;
// URI for callbackUrl and callback
if (!string.IsNullOrEmpty(callbackUrl))
{
baseRequestUri += "&c=" + WWW.EscapeURL(callbackUrl);
}
else
{
baseRequestUri += "&c=https%3A%2F%2F0s5eebblre.execute-api.ap-northeast-2.amazonaws.com/dev?key=" + session;
}
Debug.Log("Transaction baseRequestUri: " + baseRequestUri);
// URI for IPFS
IPFSClass ipfs = new IPFSClass();
trxRequestUri = await ipfs.IpfsAdd(baseRequestUri);
Debug.Log("Transaction trxRequestUri(IPFS hash): " + trxRequestUri);
// Polling request using timer
timer = new Timer {
Interval = 2000
};
timer.Elapsed += HttpRequest;
timer.AutoReset = true;
timer.Enabled = true;
timer.Start();
// Make QRCode for request
QRcode.QRcode metaQR = new QRcode.QRcode();
return(metaQR.MakeQR(256, trxRequestUri));
}
private async Task SendRawTransaction(TimestampDao timestamp, IWeb3 web3, string secretKey, double estimateGasPrice, EthSettings ethSettings)
{
if (!Enum.TryParse(ethSettings.Network, true, out Chain networkChain))
{
networkChain = Chain.MainNet;
_logger.Warning($"Unable to parse '{ethSettings.Network}' to type '{typeof(Chain)}', so setting default to '{networkChain}'.");
}
bool proofVerified = _ethHelper.VerifyStamp(timestamp);
if (!proofVerified)
{
var message = $"Unable to verify the signature '{timestamp.Signature}'.";
_logger.Warning(message);
throw new TimestampException(message);
}
string proofStr = JsonConvert.SerializeObject(
new
{
file = timestamp.FileName,
hash = timestamp.FileHash,
publicKey = timestamp.PublicKey,
signature = timestamp.Signature
});
var txData = HexStringUTF8ConvertorExtensions.ToHexUTF8(proofStr);
var fromAddress = web3.TransactionManager.Account.Address;
var futureNonce = await web3.TransactionManager.Account.NonceService.GetNextNonceAsync();
_logger.Information($"Signed transaction on chain: {networkChain}, To: {ethSettings.ToAddress}, Nonce: {futureNonce}, GasPrice: {estimateGasPrice}, From Address :{fromAddress}");
var offlineTransactionSigner = new TransactionSigner();
var encoded = offlineTransactionSigner.SignTransaction(
secretKey,
networkChain,
ethSettings.ToAddress,
Web3.Convert.ToWei(0, UnitConversion.EthUnit.Gwei),
futureNonce,
Web3.Convert.ToWei(estimateGasPrice, UnitConversion.EthUnit.Gwei),
new BigInteger(100000),
txData);
var verified = offlineTransactionSigner.VerifyTransaction(encoded);
if (!verified)
{
var message = $"Unable to verify the transaction for data '{txData}'.";
_logger.Error(message);
throw new TimestampException(message);
}
try
{
var txId = await web3.Eth.Transactions.SendRawTransaction.SendRequestAsync("0x" + encoded);
timestamp.Address = fromAddress;
timestamp.Nonce = (long)futureNonce.Value;
timestamp.TransactionId = txId;
timestamp.Network = networkChain.ToString();
timestamp.BlockNumber = -1;
if (string.IsNullOrWhiteSpace(txId))
{
timestamp.Status = TimestampState.Failed;
var message = $"Transaction failed for an user '{timestamp.UserId}' with file name '{timestamp.FileName}'.";
_logger.Error(message);
}
}
catch (RpcResponseException ex)
{
await web3.TransactionManager.Account.NonceService.ResetNonce();
if (ex.Message.Contains("nonce too low", StringComparison.InvariantCultureIgnoreCase))
{
throw new RpcClientNonceException(ex.Message);
}
else if (ex.Message.Contains("transaction underpriced", StringComparison.InvariantCultureIgnoreCase))
{
throw new RpcClientUnderpricedException(ex.Message);
}
throw;
}
}
