private List <TradeMatch> FindMatchedOrdersByAvailableBalance(string tradingPair, string side, decimal amount, string owner)
{
List <TradeMatch> result = new List <TradeMatch>();
//Find all matches
List <TradeMatch> matches = FindAllMatchedOrders(tradingPair, side, amount);
//Filter out matches based on owner's available balance
if (side == TradeSides.Buy)
{
//Get owner balance
var token = tradingPair.Split('/')[1];
IndexServices indexServices = new IndexServices();
var balance = indexServices.BalanceIndex.Get(owner, token);
decimal balanceValue = balance.Balance;
int i = 0;
bool lookForNextMatch = true;
while (lookForNextMatch)
{
//Exit if no more orders available
if (i >= matches.Count)
{
lookForNextMatch = false;
break;
}
var trade = matches[i];
var factoredPrice = ToFactoredPrice(trade.Price, token);
if (balanceValue >= (trade.Amount * factoredPrice))
{
//Full
result.Add(trade);
}
else
{
//Partial
trade.Amount = Math.Floor(balanceValue / factoredPrice);
trade.PartialOrFull = TradePartialFull.Partial;
result.Add(trade);
lookForNextMatch = false;
}
balanceValue = balanceValue - (trade.Amount * factoredPrice);
i++;
}
}
else if (side == TradeSides.Sell)
{
result = matches;
}
else
{
throw new ArgumentException();
}
return(result);
}
public decimal?GetMarketPrice(string tradingPair, string side)
{
IndexServices indexServices = new IndexServices();
var orders = indexServices.OrderIndex.GetByTradingPair(tradingPair);
if (orders != null)
{
orders = orders.Where(x => x.Side == side).ToList();
if (orders.Count == 0)
{
return(null);
}
if (side == TradeSides.Buy)
{
return(orders.Min(x => x.Price));
}
else if (side == TradeSides.Sell)
{
return(orders.Max(x => x.Price));
}
else
{
throw new ArgumentException("GetMarketPrice: Parameter side not recognized: " + side);
}
}
else
{
return(null);
}
}
public decimal?GetWalletBalance(string address, string tokenSymbol)
{
decimal?balance = null;
IndexServices indexService = new IndexServices();
var index = indexService.BalanceIndex.Get(address, tokenSymbol);
if (index != null)
{
balance = FromFactoredPrice(index.Balance, indexService.TokenIndex.Get(tokenSymbol).Decimals);
}
return(balance);
}
public void CreateGenesisBlock(
string ownerAddress,
string nativeTokenName,
string nativeTokenSymbol,
long initialSupply,
short decimals)
{
if (LastBlock != null || (ApplicationState.PendingRecords != null && ApplicationState.PendingRecords.Count > 0))
{
throw new Exception("Error CreateGenesisBlock: Chain already exist.");
}
List <Transaction> transactions = new List <Transaction>();
//Deploy native token to genesis block
TransactionToken nativeToken = new TransactionToken();
nativeToken.Name = nativeTokenName;
nativeToken.Symbol = nativeTokenSymbol;
nativeToken.Decimals = decimals;
nativeToken.TransactionId = GenerateTransactionId(nativeToken);
transactions.Add(nativeToken);
//Transfer native token supply to owner address
TransactionTransfer transfer = new TransactionTransfer();
transfer.TokenSymbol = nativeTokenSymbol;
transfer.FromAddress = null;
transfer.ToAddress = ownerAddress;
transfer.Amount = ToFactoredPrice(initialSupply, decimals);
transfer.TransactionId = GenerateTransactionId(transfer);
transactions.Add(transfer);
ApplicationState.PendingRecordsAddRange(transactions);
//Create genesis block
var header = CreateBlockHeader(true);
var block = CreateBlockAndClearPendingTx(header);
//Push genesis block to blockchain
database.SaveBlock(block);
//Update index
IndexServices indexServices = new IndexServices();
indexServices.UpdateIndex(block);
}
public string CancelOrder(
long nonce,
decimal fee,
string orderTransactionId,
string owner)
{
//Verify fee account balance
if (!HasSufficientBalanceFee(owner, fee))
{
throw new ValidationException(ResponseCodes.InsufficientFundsForFee, ResponseMessages.InsufficientFundsForFee);
}
//Check if the cancelling transaction belongs to this owner
IndexServices indexServices = new IndexServices();
var orderToCancel = indexServices.OrderIndex.Get(orderTransactionId);
if (orderToCancel.Owner != owner)
{
throw new ValidationException(ResponseCodes.OrderDoesNotBelongToRequester, ResponseMessages.OrderDoesNotBelongToRequester);
}
TransactionOrderCancel order = new TransactionOrderCancel();
order.Nonce = nonce;
order.OrderTransactionId = orderTransactionId;
order.Owner = owner;
order.TransactionId = GenerateTransactionId(order);
//Check if same transaction has already been received
if (IsTransactionInPending(order.TransactionId))
{
return(order.TransactionId);
}
//Delete from index so new orders does not match with this cancelled order
indexServices.OrderIndex.DeleteSingleTransaction(orderTransactionId);
//Note: Do not remove the cancelled order from pending records, otherwise the order would not go into next block
//hence this transaction is unable to tie back to the originally cancelled order in the block
ApplicationState.PendingRecordsAdd(order);
return(order.TransactionId);
}
public void RegisterSelfOnNetwork(string walletAddress, string signature, bool broadcast)
{
ApplicationLog.Info("Registering self on the network.");
//Broadcast to other nodes
if (broadcast)
{
var nodes = ApplicationState.ConnectedNodesExceptSelf;
Parallel.ForEach(nodes, new ParallelOptions {
MaxDegreeOfParallelism = ConstantConfig.BroadcastThreadCount
}, networkNode =>
{
ApiClient api = new ApiClient(networkNode.ServerAddress);
api.AnnounceRegisterNode(ApplicationState.ServerAddress, walletAddress, signature);
});
}
//Register self in local nodes cache
//Get wallet balance
decimal walletBalance = 0;
IndexServices indexServices = new IndexServices();
var nativeToken = indexServices.TokenIndex.GetNative();
if (nativeToken != null) //Native token would be null if chain has not yet been sync / no local chain
{
var walletIndex = indexServices.BalanceIndex.Get(walletAddress, indexServices.TokenIndex.GetNative().Symbol);
if (walletIndex != null)
{
walletBalance = walletIndex.Balance;
}
}
//Add node to local consensus ledger
Node node = new Node()
{
ServerAddress = ApplicationState.ServerAddress,
WalletAddress = walletAddress,
Signature = signature,
Balance = walletBalance
};
AddConsensusNode(node);
ApplicationState.Node = node;
}
public void SaveBlockToChain(Block block)
{
//Validate block hash
var previousBlock = database.GetBlock(block.Header.Index - 1);
if (previousBlock.Header.Hash != block.Header.PreviousHash)
{
throw new ValidationException(ResponseCodes.InvalidHash, ResponseMessages.InvalidHash);
}
//Push the new block to blockchain
database.SaveBlock(block);
//Update index
IndexServices indexService = new IndexServices();
indexService.UpdateIndex(block);
}
/// <summary>
/// Returns the network fee based on number of transactions in the latest block
/// </summary>
public long GetNetworkFee()
{
DataServices dataServices = new DataServices();
var lastBlock = dataServices.LastBlock;
if (lastBlock != null)
{
IndexServices indexServices = new IndexServices();
var nativeToken = indexServices.TokenIndex.GetNative();
var multiplier = Convert.ToInt64(Math.Floor(Convert.ToDecimal(lastBlock.Header.TransactionCount / ConstantConfig.NetworkFeeUnit)));
var rate = ToFactoredPrice(ConstantConfig.NetworkFeeRate, nativeToken.Decimals);
return(rate * multiplier);
}
else
{
return(0);
}
}
protected bool HasSufficientBalance(string address, string symbol, decimal amount)
{
if (amount <= 0)
{
return(true);
}
IndexServices indexServices = new IndexServices();
var factoredPrice = ToFactoredPrice(amount, indexServices.TokenIndex.Get(symbol).Decimals);
//Verify account balance
var senderWallet = indexServices.BalanceIndex.Get(address, symbol);
if (senderWallet == null || senderWallet.Balance < factoredPrice)
{
return(false);
}
else
{
return(true);
}
}
//TODO: for IoC orders
//FindMatchedOrdersByGivenBalance
/// <summary>
/// Find all trades that match for this order and returns the list of matched orders
/// </summary>
private List <TradeMatch> FindAllMatchedOrders(string tradingPair, string side, decimal amount)
{
List <TradeMatch> result = new List <TradeMatch>();
decimal balanceAmount = amount;
IndexServices indexServices = new IndexServices();
var orders = indexServices.OrderIndex.GetByTradingPair(tradingPair);
if (orders == null || orders.Count == 0)
{
throw new ValidationException(ResponseCodes.NotEnoughOrdersAvailable, ResponseMessages.NotEnoughOrdersAvailable);
}
if (side == TradeSides.Buy)
{
//Get sell orders sorted by lowest price
var sellOrders = orders
.Where(x => x.Side == TradeSides.Sell)
.OrderBy(x => x.Price)
.ToList();
int i = 0;
bool lookForNextMatch = true;
while (lookForNextMatch)
{
//Exit if no more orders available
if (i >= sellOrders.Count ||
balanceAmount == 0)
{
lookForNextMatch = false;
break;
}
var currentOrder = sellOrders[i];
//Check full/partial
if (balanceAmount >= currentOrder.Amount)
{
result.Add(new TradeMatch()
{
TransactionId = currentOrder.TransactionId,
Address = currentOrder.Owner,
TradingPair = tradingPair,
Side = currentOrder.Side,
Amount = currentOrder.Amount,
Price = currentOrder.Price,
PartialOrFull = TradePartialFull.Full
});
balanceAmount = balanceAmount - currentOrder.Amount;
i++;
}
else
{
result.Add(new TradeMatch()
{
TransactionId = currentOrder.TransactionId,
Address = currentOrder.Owner,
TradingPair = tradingPair,
Side = currentOrder.Side,
Amount = balanceAmount,
Price = currentOrder.Price,
PartialOrFull = TradePartialFull.Partial
});
lookForNextMatch = false;
balanceAmount = 0;
i++;
}
}
}
else if (side == TradeSides.Sell)
{
//Get buy orders sorted by highest price
var buyOrders = orders
.Where(x => x.Side == TradeSides.Buy)
.OrderByDescending(x => x.Price)
.ToList();
int i = 0;
bool lookForNextMatch = true;
while (lookForNextMatch)
{
var currentOrder = buyOrders[i];
//Check if there is anymore order
if (i >= buyOrders.Count)
{
lookForNextMatch = false;
break;
}
//Check full/partial
if (balanceAmount > currentOrder.Amount)
{
result.Add(new TradeMatch()
{
TransactionId = currentOrder.TransactionId,
Address = currentOrder.Owner,
TradingPair = tradingPair,
Side = currentOrder.Side,
Amount = currentOrder.Amount,
Price = currentOrder.Price,
PartialOrFull = TradePartialFull.Full
});
balanceAmount = balanceAmount - currentOrder.Amount;
i++;
}
else
{
result.Add(new TradeMatch()
{
TransactionId = currentOrder.TransactionId,
Address = currentOrder.Owner,
TradingPair = tradingPair,
Side = currentOrder.Side,
Amount = balanceAmount,
Price = currentOrder.Price,
PartialOrFull = TradePartialFull.Partial
});
lookForNextMatch = false;
balanceAmount = 0;
i++;
}
}
}
else
{
throw new ArgumentException();
}
return(result);
}
public TradeServices()
{
indexServices = new IndexServices();
}
public TransactionServices()
{
indexServices = new IndexServices();
}
protected bool HasSufficientBalanceFee(string address, decimal amount)
{
IndexServices indexServices = new IndexServices();
return(HasSufficientBalance(address, indexServices.TokenIndex.GetNative().Symbol, amount));
}
protected long FromFactoredPrice(decimal amount, string symbol)
{
IndexServices indexServices = new IndexServices();
return(FromFactoredPrice(amount, indexServices.TokenIndex.Get(symbol).Decimals));
}
protected long ToFactoredPriceFee(decimal amount)
{
IndexServices indexServices = new IndexServices();
return(ToFactoredPrice(amount, indexServices.TokenIndex.GetNative().Decimals));
}