public async Task <FaucetResponse> TryRequestEthAsync(string node, Address?address, UInt256 value)
{
if (!_enabled)
{
if (_logger.IsInfo)
{
_logger.Info("NDM Faucet is disabled.");
}
return(FaucetResponse.FaucetDisabled);
}
if (!_initialized)
{
if (_logger.IsInfo)
{
_logger.Info("NDM Faucet is not initialized.");
}
return(FaucetResponse.FaucetDisabled);
}
if (_today.Date != _timestamper.UtcNow.Date)
{
lock (_locker)
{
_today = _timestamper.UtcNow;
_todayRequestsTotalValueWei = 0;
}
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet has updated its today's date ({_today.Date:d}) and reset the total requests value.");
}
}
if (_faucetAddress is null || _faucetAddress == Address.Zero)
{
if (_logger.IsWarn)
{
_logger.Warn("NDM Faucet address is not set.");
}
return(FaucetResponse.FaucetAddressNotSet);
}
if (string.IsNullOrWhiteSpace(node) || address is null || address == Address.Zero)
{
if (_logger.IsInfo)
{
_logger.Info("Invalid NDM Faucet request.");
}
return(FaucetResponse.InvalidNodeAddress);
}
if (_faucetAddress == address)
{
if (_logger.IsInfo)
{
_logger.Info("NDM Faucet request cannot be processed for the same address as NDM Faucet.");
}
return(FaucetResponse.SameAddressAsFaucet);
}
if (value == 0)
{
if (_logger.IsInfo)
{
_logger.Info("NDM Faucet request cannot be processed for the zero value.");
}
return(FaucetResponse.ZeroValue);
}
if (value > _maxValue)
{
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet request from: {node} has too big value: {value} wei > {_maxValue} wei.");
}
return(FaucetResponse.TooBigValue);
}
if (_logger.IsInfo)
{
_logger.Info($"Received NDM Faucet request from: {node}, address: {address}, value: {value} wei.");
}
if (_pendingRequests.TryGetValue(node, out _))
{
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet request from: {node} is already being processed.");
}
return(FaucetResponse.RequestAlreadyProcessing);
}
var latestRequest = await _requestRepository.GetLatestAsync(node);
var requestedAt = _timestamper.UtcNow;
if (!(latestRequest is null) && latestRequest.RequestedAt.Date >= requestedAt.Date)
{
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet request from: {node} was already processed today at: {latestRequest.RequestedAt}.");
}
return(FaucetResponse.RequestAlreadyProcessedToday(FaucetRequestDetails.From(latestRequest)));
}
if (!_pendingRequests.TryAdd(node, true))
{
if (_logger.IsWarn)
{
_logger.Warn($"Couldn't start processing NDM Faucet request from: {node}.");
}
return(FaucetResponse.RequestError);
}
lock (_locker)
{
_todayRequestsTotalValueWei += value;
if (_logger.IsInfo)
{
_logger.Info($"Increased NDM Faucet total value of today's ({_today.Date:d}) requests to {_todayRequestsTotalValueWei} wei.");
}
}
if (_todayRequestsTotalValueWei > _dailyRequestsTotalValueWei)
{
if (_logger.IsInfo)
{
_logger.Info($"Daily ({_today.Date:d}) requests value for NDM Faucet was reached ({_dailyRequestsTotalValueWei} wei).");
}
return(FaucetResponse.DailyRequestsTotalValueReached);
}
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet is processing request for: {node}, address: {address}, value: {value} wei.");
}
try
{
var nonce = await _blockchainBridge.GetNonceAsync(_faucetAddress);
var transaction = new Transaction
{
Value = value,
GasLimit = Transaction.BaseTxGasCost,
GasPrice = 20.GWei(),
To = address,
SenderAddress = _faucetAddress,
Nonce = nonce
};
_wallet.Sign(transaction, await _blockchainBridge.GetNetworkIdAsync());
Keccak?transactionHash = await _blockchainBridge.SendOwnTransactionAsync(transaction);
if (transactionHash == null)
{
return(FaucetResponse.ProcessingRequestError);
}
if (latestRequest is null)
{
Keccak requestId = Keccak.Compute(Rlp.Encode(Rlp.Encode(node)).Bytes);
latestRequest = new EthRequest(requestId, node, address, value, requestedAt, transactionHash);
await _requestRepository.AddAsync(latestRequest);
}
else
{
latestRequest.UpdateRequestDetails(address, value, requestedAt, transactionHash);
await _requestRepository.UpdateAsync(latestRequest);
}
if (_logger.IsInfo)
{
_logger.Info($"NDM Faucet has successfully processed request for: {node}, address: {address}, value: {value} wei.");
}
return(FaucetResponse.RequestCompleted(FaucetRequestDetails.From(latestRequest)));
}
catch (Exception ex)
{
if (_logger.IsError)
{
_logger.Error(ex.Message, ex);
}
lock (_locker)
{
_todayRequestsTotalValueWei -= value;
if (_logger.IsInfo)
{
_logger.Info($"Decreased NDM Faucet total value of today's ({_today.Date:d}) requests to {_todayRequestsTotalValueWei} wei.");
}
}
return(FaucetResponse.ProcessingRequestError);
}
finally
{
_pendingRequests.TryRemove(node, out _);
}
}
public async Task <bool> TryRequestEthAsync(string host, Address address, UInt256 value)
{
if (!_enabled)
{
if (_logger.IsInfo)
{
_logger.Info("NDM Faucet is disabled");
}
return(false);
}
if (_faucetAddress is null || _faucetAddress == Address.Zero)
{
if (_logger.IsWarn)
{
_logger.Warn("NDM Faucet address is not set");
}
return(false);
}
if (string.IsNullOrWhiteSpace(host) || address is null || address == Address.Zero ||
_faucetAddress == address || value == 0)
{
if (_logger.IsInfo)
{
_logger.Info("Invalid NDM Faucet ETH request");
}
return(false);
}
if (value > _maxValue)
{
if (_logger.IsInfo)
{
_logger.Info($"ETH request from: {host} has too big value: {value} wei > {_maxValue} wei");
}
return(false);
}
if (_pendingRequests.TryGetValue(host, out _))
{
if (_logger.IsInfo)
{
_logger.Info($"ETH request from: {host} is already being processed.");
}
return(false);
}
if (_logger.IsInfo)
{
_logger.Info($"Received ETH request from: {host}, address: {address}, value: {value} wei");
}
var latestRequest = await _requestRepository.GetLatestAsync(host);
var requestedAt = _timestamp.UtcNow;
if (!(latestRequest is null) && latestRequest.RequestedAt.Date >= requestedAt.Date)
{
if (_logger.IsInfo)
{
_logger.Info($"ETH request from: {host} was already processed today at: {latestRequest.RequestedAt}");
}
return(false);
}
if (!_pendingRequests.TryAdd(host, true))
{
if (_logger.IsWarn)
{
_logger.Warn($"Couldn't start processing ETH request from: {host}");
}
return(false);
}
if (_logger.IsInfo)
{
_logger.Info($"Processing ETH request for: {host}, address: {address}, value: {value} wei");
}
try
{
var faucetAccount = _blockchainBridge.GetAccount(_faucetAddress);
var transaction = new Transaction
{
Value = value,
GasLimit = 21000,
GasPrice = 20.GWei(),
To = address,
SenderAddress = _faucetAddress,
Nonce = faucetAccount?.Nonce ?? 0
};
_blockchainBridge.Sign(transaction);
var transactionHash = _blockchainBridge.SendTransaction(transaction);
if (latestRequest is null)
{
var requestId = Keccak.Compute(Rlp.Encode(Rlp.Encode(host)));
await _requestRepository.AddAsync(new EthRequest(requestId, host, address, value, requestedAt,
transactionHash));
}
else
{
latestRequest.UpdateRequestDate(requestedAt);
await _requestRepository.UpdateAsync(latestRequest);
}
if (_logger.IsInfo)
{
_logger.Info($"ETH request was successfully processed for: {host}, address: {address}, value: {value} wei");
}
return(true);
}
catch (Exception e)
{
if (_logger.IsError)
{
_logger.Error(e.Message, e);
}
return(false);
}
finally
{
_pendingRequests.TryRemove(host, out _);
}
}