public async Task <ExchangeResult> ExecuteAsync(ExchangeCommand cmd)
{
BlockchainType network = await _assetSettingsService.GetNetworkAsync(cmd.SourceAssetId);
if (await _assetSettingsService.GetNetworkAsync(cmd.DestAssetId) != network)
{
throw new ExchangeOperationNotSupportedException("Assets are being served by different blockchains");
}
IAssetPairRate rate = await _assetRatesService.GetCurrentRateAsync(cmd.SourceAssetId, cmd.DestAssetId);
if (cmd.ExpectedRate != null && rate.BidPrice != cmd.ExpectedRate)
{
throw new ExchangeRateChangedException(rate.BidPrice);
}
string hotwallet = _bcnSettingsResolver.GetExchangeHotWallet(network);
string sourceAddress = await GetSourceAddressAsync(cmd);
decimal exchangeAmount = cmd.SourceAmount * rate.BidPrice;
await _walletBalanceValidator.ValidateTransfer(sourceAddress, cmd.SourceAssetId, cmd.SourceAmount);
await _walletBalanceValidator.ValidateTransfer(hotwallet, cmd.DestAssetId, exchangeAmount);
TransferResult toHotWallet = await _retryPolicy
.ExecuteAsync(() => _transferService.ExchangeThrowFail(
cmd.SourceAssetId,
sourceAddress,
hotwallet,
cmd.SourceAmount));
await RegisterTransferTxsAsync(toHotWallet);
string destAddress = await GetDestAddressAsync(cmd);
TransferResult fromHotWallet = await _retryPolicy
.ExecuteAsync(() => _transferService.ExchangeThrowFail(
cmd.DestAssetId,
hotwallet,
destAddress,
exchangeAmount));
await RegisterTransferTxsAsync(fromHotWallet, false);
return(new ExchangeResult
{
SourceAssetId = cmd.SourceAssetId,
SourceAmount = cmd.SourceAmount,
DestAssetId = cmd.DestAssetId,
DestAmount = exchangeAmount,
Rate = rate.BidPrice
});
}
