public async Task <BrokerExchangeResult> Exchange(BrokerExchangeToStableParams model)
{
_logger.LogInformation("Exchange: {@params}", model);
//ValidateExchangeParams(model);
// calculate exchange
Exchange exchange = await ExchangeToStableCalculator.Create(model, _rateCache, _settings);
exchange.InTxId = Guid.NewGuid().ToString();
exchange.InBlockNumber = await _graft.Sale(exchange.InTxId, exchange.SellAmount);
exchange.PayWalletAddress = _settings.GraftWalletAddress;
exchange.Log($"{model.SellCurrency} address: {exchange.PayWalletAddress}");
_cache.Set(exchange.ExchangeId, exchange, DateTimeOffset.Now.AddMinutes(_settings.PaymentTimeoutMinutes));
_db.Exchange.Add(exchange);
await _db.SaveChangesAsync();
var res = GetExchangeResult(exchange);
_logger.LogInformation("Exchange Result: {@params}", res);
return(res);
}
internal static async Task <Exchange> Create(BrokerExchangeToStableParams model,
IRateCache rateCache, ExchangeServiceConfiguration settings)
{
var log = new List <EventItem>
{
new EventItem($"Started exchange calculation")
};
log.Add(new EventItem($"Requesting GRFT rate..."));
decimal graftRate = await rateCache.GetRateToUsd("GRFT");
log.Add(new EventItem($"Received GRFT rate: {graftRate} USD"));
decimal fee = settings.ExchangeBrokerFee;
decimal usdAmount = graftRate * model.SellAmount;
decimal feeAmount = usdAmount * fee;
decimal buyerAmount = usdAmount - feeAmount;
var exchange = new Exchange
{
ExchangeId = model.ExchangeId ?? Guid.NewGuid().ToString(),
CreatedAt = DateTime.UtcNow,
//Status = PaymentStatus.Waiting,
SellAmount = model.SellAmount,
SellCurrency = model.SellCurrency,
BuyAmount = buyerAmount,
BuyCurrency = "USDT",
SellToUsdRate = 1M,
GraftToUsdRate = graftRate,
ExchangeBrokerFee = feeAmount,
BuyerWallet = model.WalletAddress,
InTxStatus = PaymentStatus.Waiting,
OutTxStatus = PaymentStatus.New
};
exchange.ProcessingEvents = log;
log.Add(new EventItem($"Created exchange: {exchange.SellAmount} {exchange.SellCurrency} to {exchange.BuyAmount} {exchange.BuyCurrency}"));
log.Add(new EventItem($"Exchange Broker fee of {fee*100}% is {exchange.ExchangeBrokerFee} GRFT"));
return(exchange);
}
async Task ExchangeToStable(Payment payment)
{
try
{
var terminal = _db.Terminal
.Where(t => t.Id == payment.TerminalId)
.Include(t => t.ServiceProvider)
.Include(t => t.Store).ThenInclude(t => t.Merchant)
.FirstOrDefault();
if (terminal == null)
{
throw new ApiException(ErrorCode.InvalidApiKey);
}
var prm = new BrokerExchangeToStableParams()
{
SellCurrency = "GRFT",
SellAmount = payment.MerchantAmount,
WalletAddress = terminal.ServiceProvider.WalletAddress
};
var exchangeToStableRes = await _broker.ExchangeToStable(prm);
payment.BrokerGraftWallet = exchangeToStableRes.PayWalletAddress;
payment.ConvertToStableTxId = exchangeToStableRes.GraftPaymentId;
payment.ConvertToStableBlockNumber = exchangeToStableRes.GraftBlockNumber;
// pay GRFT to the broker
await _graft.Pay(payment.ConvertToStableTxId, payment.ConvertToStableBlockNumber,
payment.BrokerGraftWallet, payment.MerchantAmount);
//await PayToBroker(payment);
// check status
await _broker.ExchangeToStableStatus(new BrokerExchangeStatusParams { ExchangeId = exchangeToStableRes.ExchangeId });
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
throw;
}
}
public async Task <IActionResult> ExchangeToStable([FromBody] BrokerExchangeToStableParams model)
{
var res = await _exchangeToStableService.Exchange(model);
return(Ok(res));
}