public void PrintSymbols(IExchangeAPI api)
{
api.GetSymbols().ToList().ForEach(s => Console.WriteLine(s));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="api">Exchange API</param>
/// <param name="symbol">The symbol to trade by default, can be null</param>
public ExchangeInfo(IExchangeAPI api, string symbol = null)
{
API = api;
Symbols = api.GetSymbols().ToArray();
TradeInfo = new ExchangeTradeInfo(this, symbol);
}
public ActionResult BacktesterResults(string exchange, string coinsToBuy, string baseCurrency, bool saveSignals, decimal startingWallet, decimal tradeAmount, DateTime?from = null, DateTime?to = null, string candleSize = "5", string strategy = "all")
{
var strategies = new JObject();
var coins = new List <string>();
if (String.IsNullOrEmpty(coinsToBuy))
{
IExchangeAPI api = ExchangeAPI.GetExchangeAPI(exchange);
var exchangeCoins = api.GetSymbolsMetadataAsync().Result.Where(m => m.BaseCurrency == baseCurrency);
foreach (var coin in exchangeCoins)
{
coins.Add(api.ExchangeSymbolToGlobalSymbol(coin.MarketName));
}
}
else
{
Char delimiter = ',';
String[] coinsToBuyArray = coinsToBuy.Split(delimiter);
foreach (var coin in coinsToBuyArray)
{
coins.Add(coin.ToUpper());
}
}
var backtestOptions = new BacktestOptions
{
DataFolder = Global.DataPath,
Exchange = (Exchange)Enum.Parse(typeof(Exchange), exchange, true),
Coins = coins,
CandlePeriod = Int32.Parse(candleSize)
};
if (from.HasValue)
{
backtestOptions.StartDate = from.Value;
}
if (to.HasValue)
{
backtestOptions.EndDate = to.Value;
backtestOptions.EndDate = backtestOptions.EndDate.AddDays(1).AddMinutes(-1);
}
if (tradeAmount == 0m)
{
tradeAmount = backtestOptions.StakeAmount;
}
if (startingWallet == 0m)
{
startingWallet = backtestOptions.StartingWallet;
}
var cts = new CancellationTokenSource();
var parallelOptions = new ParallelOptions
{
CancellationToken = cts.Token,
MaxDegreeOfParallelism = Environment.ProcessorCount
};
Parallel.ForEach(BacktestFunctions.GetTradingStrategies(), parallelOptions, async tradingStrategy =>
{
if (strategy != "all")
{
var base64EncodedBytes = Convert.FromBase64String(strategy);
if (tradingStrategy.Name != Encoding.UTF8.GetString(base64EncodedBytes))
{
return;
}
}
var result = await BacktestFunctions.BackTestJson(tradingStrategy, backtestOptions, Global.DataStoreBacktest, baseCurrency, saveSignals, startingWallet, tradeAmount);
for (int i = 0; i < result.Count(); i++)
{
if (i == 0)
{
await Runtime.GlobalHubBacktest.Clients.All.SendAsync("SendSummary", JsonConvert.SerializeObject(result[i]));
}
else
{
await Runtime.GlobalHubBacktest.Clients.All.SendAsync("Send", JsonConvert.SerializeObject(result[i]));
}
}
});
return(new JsonResult(strategies));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="api">Exchange API</param>
/// <param name="marketSymbol">The market symbol to trade by default, can be null</param>
public ExchangeInfo(IExchangeAPI api, string marketSymbol = null)
{
API = api;
MarketSymbols = api.GetMarketSymbolsAsync().Sync().ToArray();
TradeInfo = new ExchangeTradeInfo(this, marketSymbol);
}
/// <summary>Get full order book bids and asks via web socket. This is efficient and will
/// only use the order book deltas (if supported by the exchange).</summary>
/// <param name="callback">Callback containing full order book</param>
/// <param name="maxCount">Max count of bids and asks - not all exchanges will honor this
/// parameter</param>
/// <param name="symbols">Ticker symbols or null/empty for all of them (if supported)</param>
/// <returns>Web socket, call Dispose to close</returns>
public static IWebSocket GetOrderBookWebSocket(this IExchangeAPI api, Action <ExchangeOrderBook> callback, int maxCount = 20, params string[] symbols)
{
// Notes:
// * Confirm with the Exchange's API docs whether the data in each event is the absolute quantity or differential quantity
// * Receiving an event that removes a price level that is not in your local order book can happen and is normal.
var fullBooks = new ConcurrentDictionary <string, ExchangeOrderBook>();
var freshBooksQueue = new Dictionary <string, Queue <ExchangeOrderBook> >();
var fullBookRequestLock = new HashSet <string>();
void applyDelta(SortedDictionary <decimal, ExchangeOrderPrice> deltaValues, SortedDictionary <decimal, ExchangeOrderPrice> bookToEdit)
{
foreach (ExchangeOrderPrice record in deltaValues.Values)
{
if (record.Amount <= 0 || record.Price <= 0)
{
bookToEdit.Remove(record.Price);
}
else
{
bookToEdit[record.Price] = record;
}
}
}
void updateOrderBook(ExchangeOrderBook fullOrderBook, ExchangeOrderBook freshBook)
{
lock (fullOrderBook)
{
// update deltas as long as the full book is at or before the delta timestamp
if (fullOrderBook.SequenceId <= freshBook.SequenceId)
{
applyDelta(freshBook.Asks, fullOrderBook.Asks);
applyDelta(freshBook.Bids, fullOrderBook.Bids);
fullOrderBook.SequenceId = freshBook.SequenceId;
}
}
}
async Task innerCallback(ExchangeOrderBook freshBook)
{
bool foundFullBook = fullBooks.TryGetValue(freshBook.Symbol, out ExchangeOrderBook fullOrderBook);
switch (api.Name)
{
// Fetch an initial book the first time and apply deltas on top
// send these exchanges scathing support tickets that they should send
// the full book for the first web socket callback message
case ExchangeName.Bittrex:
case ExchangeName.Binance:
case ExchangeName.Poloniex:
{
if (!foundFullBook)
{
// attempt to find the right queue to put the partial order book in to be processed later
lock (freshBooksQueue)
{
if (!freshBooksQueue.TryGetValue(freshBook.Symbol, out Queue <ExchangeOrderBook> freshQueue))
{
// no queue found, make a new one
freshBooksQueue[freshBook.Symbol] = freshQueue = new Queue <ExchangeOrderBook>();
}
freshQueue.Enqueue(freshBook);
}
bool makeRequest;
lock (fullBookRequestLock)
{
makeRequest = fullBookRequestLock.Add(freshBook.Symbol);
}
if (makeRequest)
{
// we are the first to see this symbol, make a full request to API
fullBooks[freshBook.Symbol] = fullOrderBook = await api.GetOrderBookAsync(freshBook.Symbol, maxCount);
fullOrderBook.Symbol = freshBook.Symbol;
// now that we have the full order book, we can process it (and any books in the queue)
}
else
{
// stop processing, other code will take these items out of the queue later
return;
}
}
// check if any old books for this symbol, if so process them first
lock (freshBooksQueue)
{
if (freshBooksQueue.TryGetValue(freshBook.Symbol, out Queue <ExchangeOrderBook> freshQueue))
{
while (freshQueue.Count != 0)
{
updateOrderBook(fullOrderBook, freshQueue.Dequeue());
}
}
}
break;
}
// First response from exchange will be the full order book.
// Subsequent updates will be deltas, at least some exchanges have their heads on straight
case ExchangeName.BitMEX:
case ExchangeName.Okex:
case ExchangeName.Coinbase:
{
if (!foundFullBook)
{
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
}
else
{
updateOrderBook(fullOrderBook, freshBook);
}
break;
}
// Websocket always returns full order book
case ExchangeName.Huobi:
{
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
break;
}
default:
throw new NotSupportedException("Full order book web socket not supported for exchange " + api.Name);
}
fullOrderBook.LastUpdatedUtc = DateTime.UtcNow;
callback(fullOrderBook);
}
IWebSocket socket = api.GetOrderBookDeltasWebSocket(async(b) =>
{
try
{
await innerCallback(b);
}
catch
{
}
}, maxCount, symbols);
socket.Connected += (s) =>
{
// when we re-connect, we must invalidate the order books, who knows how long we were disconnected
// and how out of date the order books are
fullBooks.Clear();
lock (freshBooksQueue)
{
freshBooksQueue.Clear();
}
lock (fullBookRequestLock)
{
fullBookRequestLock.Clear();
}
return(Task.CompletedTask);
};
return(socket);
}
public async Task <Tuple <DateTime, DateTime> > CacheAllData(ExchangeAPI api, Exchange exchange)
{
Global.Logger.Information($"Starting CacheAllData");
var watch1 = System.Diagnostics.Stopwatch.StartNew();
var exchangeCoins = api.GetMarketSymbolsMetadataAsync().Result.Where(m => m.BaseCurrency == Global.Configuration.TradeOptions.QuoteCurrency);
// If there are items on the only trade list remove the rest
if (Global.Configuration.TradeOptions.OnlyTradeList.Count > 0)
{
exchangeCoins = exchangeCoins.Where(m => Global.Configuration.TradeOptions.OnlyTradeList.Any(c => c.Contains(m.MarketSymbol))).ToList();
}
var currentExchangeOption = Global.Configuration.ExchangeOptions.FirstOrDefault();
IExchangeAPI realExchange = ExchangeAPI.GetExchangeAPI(api.Name);
var returns = new Tuple <DateTime, DateTime>(DateTime.MinValue, DateTime.MinValue);
foreach (var coin in exchangeCoins)
{
var symbol = coin.MarketSymbol;
if (realExchange is ExchangeBinanceAPI)
{
symbol = await api.ExchangeMarketSymbolToGlobalMarketSymbolAsync(symbol);
}
var backtestOptions = new BacktestOptions
{
DataFolder = Global.DataPath,
Exchange = exchange,
Coin = symbol,
CandlePeriod = Int32.Parse(currentExchangeOption.SimulationCandleSize)
};
var key1 = api.Name + backtestOptions.Coin + backtestOptions.CandlePeriod;
var data1 = Global.AppCache.Get <List <Candle> >(key1);
if (data1 != null)
{
returns = new Tuple <DateTime, DateTime>(data1.First().Timestamp, data1.Last().Timestamp);
continue;
}
Candle databaseFirstCandle = Global.DataStoreBacktest.GetBacktestFirstCandle(backtestOptions).Result;
Candle databaseLastCandle = Global.DataStoreBacktest.GetBacktestLastCandle(backtestOptions).Result;
if (databaseFirstCandle == null || databaseLastCandle == null)
{
continue;
}
backtestOptions.StartDate = databaseFirstCandle.Timestamp;
backtestOptions.EndDate = databaseLastCandle.Timestamp;
var candleProvider = new DatabaseCandleProvider();
var _candle15 = candleProvider.GetCandles(backtestOptions, Global.DataStoreBacktest).Result;
_candle15 = await _candle15.FillCandleGaps((Period)Enum.Parse(typeof(Period), backtestOptions.CandlePeriod.ToString(), true));
Global.AppCache.Remove(backtestOptions.Coin + backtestOptions.CandlePeriod);
Global.AppCache.Add(api.Name + backtestOptions.Coin + backtestOptions.CandlePeriod, _candle15, new MemoryCacheEntryOptions());
Global.Logger.Information($" Cached {key1}");
backtestOptions.CandlePeriod = 1;
var key2 = api.Name + backtestOptions.Coin + backtestOptions.CandlePeriod;
if (Global.AppCache.Get <List <Candle> >(key2) != null)
{
continue;
}
Candle database1FirstCandle = Global.DataStoreBacktest.GetBacktestFirstCandle(backtestOptions).Result;
Candle database1LastCandle = Global.DataStoreBacktest.GetBacktestLastCandle(backtestOptions).Result;
if (database1FirstCandle == null || database1LastCandle == null)
{
continue;
}
backtestOptions.StartDate = database1FirstCandle.Timestamp;
backtestOptions.EndDate = database1LastCandle.Timestamp;
var _candle1 = candleProvider.GetCandles(backtestOptions, Global.DataStoreBacktest).Result;
_candle1 = await _candle1.FillCandleGaps((Period)Enum.Parse(typeof(Period), backtestOptions.CandlePeriod.ToString(), true));
Global.AppCache.Remove(backtestOptions.Coin + backtestOptions.CandlePeriod);
Global.AppCache.Add(api.Name + backtestOptions.Coin + backtestOptions.CandlePeriod, _candle1, new MemoryCacheEntryOptions());
Global.Logger.Information($" Cached {key2}");
returns = new Tuple <DateTime, DateTime>(backtestOptions.StartDate, backtestOptions.EndDate);
}
watch1.Stop();
Global.Logger.Warning($"Ended CacheAllData in #{watch1.Elapsed.TotalSeconds} seconds");
return(returns);
}
public Data GetGata(string market, IExchangeAPI exchange)
{
return(new Data {
DateTime = DateTime.Now, Price = GetFirstAsk(market, exchange)
});
}
public void Save()
{
stExchange = API;
}
public override async Task RunCommand()
{
var marketSymbol = "BTC-USD";
var marketSymbol2 = "XXBTZUSD";
IExchangeAPI
apiCoinbase = await ExchangeAPI.GetExchangeAPIAsync(ExchangeName.Coinbase),
apiGemini = await ExchangeAPI.GetExchangeAPIAsync(ExchangeName.Gemini),
apiKraken = await ExchangeAPI.GetExchangeAPIAsync(ExchangeName.Kraken),
apiBitfinex = await ExchangeAPI.GetExchangeAPIAsync(ExchangeName.Bitfinex);
//TODO: Make this multi-threaded and add parameters
Console.WriteLine("Use CTRL-C to stop.");
while (true)
{
var ticker = await apiCoinbase.GetTickerAsync(marketSymbol);
var orders = await apiCoinbase.GetOrderBookAsync(marketSymbol);
var askAmountSum = orders.Asks.Values.Sum(o => o.Amount);
var askPriceSum = orders.Asks.Values.Sum(o => o.Price);
var bidAmountSum = orders.Bids.Values.Sum(o => o.Amount);
var bidPriceSum = orders.Bids.Values.Sum(o => o.Price);
var ticker2 = await apiGemini.GetTickerAsync(marketSymbol);
var orders2 = await apiGemini.GetOrderBookAsync(marketSymbol);
var askAmountSum2 = orders2.Asks.Values.Sum(o => o.Amount);
var askPriceSum2 = orders2.Asks.Values.Sum(o => o.Price);
var bidAmountSum2 = orders2.Bids.Values.Sum(o => o.Amount);
var bidPriceSum2 = orders2.Bids.Values.Sum(o => o.Price);
var ticker3 = await apiKraken.GetTickerAsync(marketSymbol2);
var orders3 = await apiKraken.GetOrderBookAsync(marketSymbol2);
var askAmountSum3 = orders3.Asks.Values.Sum(o => o.Amount);
var askPriceSum3 = orders3.Asks.Values.Sum(o => o.Price);
var bidAmountSum3 = orders3.Bids.Values.Sum(o => o.Amount);
var bidPriceSum3 = orders3.Bids.Values.Sum(o => o.Price);
var ticker4 = await apiBitfinex.GetTickerAsync(marketSymbol);
var orders4 = await apiBitfinex.GetOrderBookAsync(marketSymbol);
var askAmountSum4 = orders4.Asks.Values.Sum(o => o.Amount);
var askPriceSum4 = orders4.Asks.Values.Sum(o => o.Price);
var bidAmountSum4 = orders4.Bids.Values.Sum(o => o.Amount);
var bidPriceSum4 = orders4.Bids.Values.Sum(o => o.Price);
Console.Clear();
Console.WriteLine("GDAX: {0,13:N}, {1,15:N}, {2,8:N}, {3,13:N}, {4,8:N}, {5,13:N}", ticker.Last,
ticker.Volume.QuoteCurrencyVolume, askAmountSum, askPriceSum, bidAmountSum, bidPriceSum);
Console.WriteLine("GEMI: {0,13:N}, {1,15:N}, {2,8:N}, {3,13:N}, {4,8:N}, {5,13:N}", ticker2.Last,
ticker2.Volume.QuoteCurrencyVolume, askAmountSum2, askPriceSum2, bidAmountSum2, bidPriceSum2);
Console.WriteLine("KRAK: {0,13:N}, {1,15:N}, {2,8:N}, {3,13:N}, {4,8:N}, {5,13:N}", ticker3.Last,
ticker3.Volume.QuoteCurrencyVolume, askAmountSum3, askPriceSum3, bidAmountSum3, bidPriceSum3);
Console.WriteLine("BITF: {0,13:N}, {1,15:N}, {2,8:N}, {3,13:N}, {4,8:N}, {5,13:N}", ticker4.Last,
ticker4.Volume.QuoteCurrencyVolume, askAmountSum4, askPriceSum4, bidAmountSum4, bidPriceSum4);
Thread.Sleep(IntervalMs);
}
}
/// <summary>
/// Get full order book bids and asks via web socket. This is efficient and will only use the order book deltas.
/// </summary>
/// <param name="callback">Callback of symbol, order book</param>
/// <param name="maxCount">Max count of bids and asks - not all exchanges will honor this parameter</param>
/// <param name="symbol">Ticker symbols or null/empty for all of them (if supported)</param>
/// <returns>Web socket, call Dispose to close</returns>
public static IDisposable GetOrderBookWebSocket(this IExchangeAPI api, Action <ExchangeOrderBook> callback, int maxCount = 20, params string[] symbols)
{
// Gets a delta socket for a collection of order books, then maintains a full order book.
// The suggested way to use this is:
// 1. Open this socket and begin buffering events you receive
// 2. Get a depth snapshot of the order books you care about
// 3. Drop any event where SequenceNumber is less than or equal to the snapshot last update id
// Notes:
// * Confirm with the Exchange's API docs whether the data in each event is the absolute quantity or differential quantity
// * If the quantity is 0, remove the price level
// * Receiving an event that removes a price level that is not in your local order book can happen and is normal.
//
Dictionary <string, ExchangeOrderBook> fullBooks = new Dictionary <string, ExchangeOrderBook>();
void innerCallback(ExchangeOrderBook book)
{
if (api.Name == ExchangeName.Binance)
{
// see if we have a full order book for the symbol
if (!fullBooks.TryGetValue(book.Symbol, out ExchangeOrderBook fullBook))
{
fullBooks[book.Symbol] = fullBook = api.GetOrderBook(book.Symbol, 1000);
fullBook.Symbol = book.Symbol;
}
// update deltas as long as the full book is at or before the delta timestamp
if (fullBook.SequenceId <= book.SequenceId)
{
foreach (var ask in book.Asks)
{
if (ask.Value.Amount <= 0m || ask.Value.Price <= 0m)
{
fullBook.Asks.Remove(ask.Value.Price);
}
else
{
fullBook.Asks[ask.Value.Price] = ask.Value;
}
}
foreach (var bid in book.Bids)
{
if (bid.Value.Amount <= 0m || bid.Value.Price <= 0m)
{
fullBook.Bids.Remove(bid.Value.Price);
}
else
{
fullBook.Bids[bid.Value.Price] = bid.Value;
}
}
fullBook.SequenceId = book.SequenceId;
}
callback(fullBook);
}
else if (api.Name == ExchangeName.Okex || api.Name == ExchangeName.BitMEX)
{
if (!fullBooks.TryGetValue(book.Symbol, out ExchangeOrderBook fullBook))
{
fullBooks[book.Symbol] = book;
fullBook.Symbol = book.Symbol;
}
foreach (var ask in book.Asks)
{
if (ask.Value.Amount <= 0m || ask.Value.Price <= 0m)
{
fullBook.Asks.Remove(ask.Value.Price);
}
else
{
fullBook.Asks[ask.Value.Price] = ask.Value;
}
}
foreach (var bid in book.Bids)
{
if (bid.Value.Amount <= 0m || bid.Value.Price <= 0m)
{
fullBook.Bids.Remove(bid.Value.Price);
}
else
{
fullBook.Bids[bid.Value.Price] = bid.Value;
}
}
callback(fullBook);
}
else if (api.Name == ExchangeName.Huobi)
{
fullBooks[book.Symbol] = book;
}
};
return(api.GetOrderBookDeltasWebSocket(innerCallback, maxCount, symbols));
}
/// <summary>Get full order book bids and asks via web socket. This is efficient and will
/// only use the order book deltas (if supported by the exchange).</summary>
/// <param name="callback">Callback containing full order book</param>
/// <param name="maxCount">Max count of bids and asks - not all exchanges will honor this
/// parameter</param>
/// <param name="symbols">Ticker symbols or null/empty for all of them (if supported)</param>
/// <returns>Web socket, call Dispose to close</returns>
public static IDisposable GetOrderBookWebSocket(this IExchangeAPI api, Action <ExchangeOrderBook> callback, int maxCount = 20, params string[] symbols)
{
// Notes:
// * Confirm with the Exchange's API docs whether the data in each event is the absolute quantity or differential quantity
// * Receiving an event that removes a price level that is not in your local order book can happen and is normal.
var fullBooks = new Dictionary <string, ExchangeOrderBook>();
void innerCallback(ExchangeOrderBook freshBook)
{
bool foundFullBook = fullBooks.TryGetValue(freshBook.Symbol, out ExchangeOrderBook fullOrderBook);
switch (api.Name)
{
// Fetch an initial book the first time and apply deltas on top
case ExchangeName.Bittrex:
case ExchangeName.Binance:
case ExchangeName.Poloniex:
{
// If we don't have an initial order book for this symbol, fetch it
if (!foundFullBook)
{
fullBooks[freshBook.Symbol] = fullOrderBook = api.GetOrderBook(freshBook.Symbol, 1000);
fullOrderBook.Symbol = freshBook.Symbol;
}
// update deltas as long as the full book is at or before the delta timestamp
if (fullOrderBook.SequenceId <= freshBook.SequenceId)
{
ApplyDelta(freshBook.Asks, fullOrderBook.Asks);
ApplyDelta(freshBook.Bids, fullOrderBook.Bids);
fullOrderBook.SequenceId = freshBook.SequenceId;
}
break;
}
// First response from exchange will be the full order book.
// Subsequent updates will be deltas
case ExchangeName.BitMEX:
case ExchangeName.Okex:
{
if (!foundFullBook)
{
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
fullOrderBook.Symbol = freshBook.Symbol;
}
else
{
ApplyDelta(freshBook.Asks, fullOrderBook.Asks);
ApplyDelta(freshBook.Bids, fullOrderBook.Bids);
}
break;
}
// Websocket always returns full order book
case ExchangeName.Huobi:
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
break;
}
callback(fullOrderBook);
}
return(api.GetOrderBookDeltasWebSocket(innerCallback, maxCount, symbols));
}
// Helper method for SELL orders (ASYNC)
public static async Task <ExchangeOrderResult> SellAsync(this IExchangeAPI api, string symbol, decimal price, decimal amount)
{
return(await ApiHelper.PlaceOrderAsync(api, symbol, OrderSide.Sell, price, amount));
}
// Helper method for SELL orders
public static ExchangeOrderResult Sell(this IExchangeAPI api, string symbol, decimal price, decimal amount)
{
return(ApiHelper.PlaceOrder(api, symbol, OrderSide.Sell, price, amount));
}
/// <summary>Get full order book bids and asks via web socket. This is efficient and will
/// only use the order book deltas (if supported by the exchange).</summary>
/// <param name="callback">Callback containing full order book</param>
/// <param name="maxCount">Max count of bids and asks - not all exchanges will honor this
/// parameter</param>
/// <param name="symbols">Ticker symbols or null/empty for all of them (if supported)</param>
/// <returns>Web socket, call Dispose to close</returns>
public static IWebSocket GetOrderBookWebSocket(this IExchangeAPI api, Action <ExchangeOrderBook> callback, int maxCount = 20, params string[] symbols)
{
// Notes:
// * Confirm with the Exchange's API docs whether the data in each event is the absolute quantity or differential quantity
// * Receiving an event that removes a price level that is not in your local order book can happen and is normal.
var fullBooks = new ConcurrentDictionary <string, ExchangeOrderBook>();
var partialOrderBookQueues = new Dictionary <string, Queue <ExchangeOrderBook> >();
void applyDelta(SortedDictionary <decimal, ExchangeOrderPrice> deltaValues, SortedDictionary <decimal, ExchangeOrderPrice> bookToEdit)
{
foreach (ExchangeOrderPrice record in deltaValues.Values)
{
if (record.Amount <= 0 || record.Price <= 0)
{
bookToEdit.Remove(record.Price);
}
else
{
bookToEdit[record.Price] = record;
}
}
}
void updateOrderBook(ExchangeOrderBook fullOrderBook, ExchangeOrderBook freshBook)
{
lock (fullOrderBook)
{
// update deltas as long as the full book is at or before the delta timestamp
if (fullOrderBook.SequenceId <= freshBook.SequenceId)
{
applyDelta(freshBook.Asks, fullOrderBook.Asks);
applyDelta(freshBook.Bids, fullOrderBook.Bids);
fullOrderBook.SequenceId = freshBook.SequenceId;
}
}
}
async Task innerCallback(ExchangeOrderBook newOrderBook)
{
// depending on the exchange, newOrderBook may be a complete or partial order book
// ideally all exchanges would send the full order book on first message, followed by delta order books
// but this is not the case
bool foundFullBook = fullBooks.TryGetValue(newOrderBook.Symbol, out ExchangeOrderBook fullOrderBook);
switch (api.Name)
{
// Fetch an initial book the first time and apply deltas on top
// send these exchanges scathing support tickets that they should send
// the full book for the first web socket callback message
case ExchangeName.Bittrex:
case ExchangeName.Binance:
case ExchangeName.Poloniex:
{
Queue <ExchangeOrderBook> partialOrderBookQueue;
bool requestFullOrderBook = false;
// attempt to find the right queue to put the partial order book in to be processed later
lock (partialOrderBookQueues)
{
if (!partialOrderBookQueues.TryGetValue(newOrderBook.Symbol, out partialOrderBookQueue))
{
// no queue found, make a new one
partialOrderBookQueues[newOrderBook.Symbol] = partialOrderBookQueue = new Queue <ExchangeOrderBook>();
requestFullOrderBook = !foundFullBook;
}
// always enqueue the partial order book, they get dequeued down below
partialOrderBookQueue.Enqueue(newOrderBook);
}
// request the entire order book if we need it
if (requestFullOrderBook)
{
fullOrderBook = await api.GetOrderBookAsync(newOrderBook.Symbol, maxCount);
fullOrderBook.Symbol = newOrderBook.Symbol;
fullBooks[newOrderBook.Symbol] = fullOrderBook;
}
else if (!foundFullBook)
{
// we got a partial book while the full order book was being requested
// return out, the full order book loop will process this item in the queue
return;
}
// else new partial book with full order book available, will get dequeued below
// check if any old books for this symbol, if so process them first
// lock dictionary of queues for lookup only
lock (partialOrderBookQueues)
{
partialOrderBookQueues.TryGetValue(newOrderBook.Symbol, out partialOrderBookQueue);
}
if (partialOrderBookQueue != null)
{
// lock the individual queue for processing, fifo queue
lock (partialOrderBookQueue)
{
while (partialOrderBookQueue.Count != 0)
{
updateOrderBook(fullOrderBook, partialOrderBookQueue.Dequeue());
}
}
}
break;
}
// First response from exchange will be the full order book.
// Subsequent updates will be deltas, at least some exchanges have their heads on straight
case ExchangeName.BitMEX:
case ExchangeName.Okex:
case ExchangeName.Coinbase:
{
if (!foundFullBook)
{
fullBooks[newOrderBook.Symbol] = fullOrderBook = newOrderBook;
}
else
{
updateOrderBook(fullOrderBook, newOrderBook);
}
break;
}
// Websocket always returns full order book, WTF...?
case ExchangeName.Huobi:
{
fullBooks[newOrderBook.Symbol] = fullOrderBook = newOrderBook;
break;
}
default:
throw new NotSupportedException("Full order book web socket not supported for exchange " + api.Name);
}
fullOrderBook.LastUpdatedUtc = DateTime.UtcNow;
callback(fullOrderBook);
}
IWebSocket socket = api.GetOrderBookDeltasWebSocket(async(b) =>
{
try
{
await innerCallback(b);
}
catch
{
}
}, maxCount, symbols);
socket.Connected += (s) =>
{
// when we re-connect, we must invalidate the order books, who knows how long we were disconnected
// and how out of date the order books are
fullBooks.Clear();
lock (partialOrderBookQueues)
{
partialOrderBookQueues.Clear();
}
return(Task.CompletedTask);
};
return(socket);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="api">Exchange API</param>
/// <param name="marketSymbols">Market symbols</param>
/// <param name="marketSymbol">The market symbol to trade by default, can be null</param>
public ExchangeInfo(IExchangeAPI api, IReadOnlyCollection <string> marketSymbols, string marketSymbol = null)
{
API = api;
MarketSymbols = marketSymbols;
TradeInfo = new ExchangeTradeInfo(this, marketSymbol);
}
/// <summary>Get full order book bids and asks via web socket. This is efficient and will
/// only use the order book deltas (if supported by the exchange).</summary>
/// <param name="callback">Callback containing full order book</param>
/// <param name="maxCount">Max count of bids and asks - not all exchanges will honor this
/// parameter</param>
/// <param name="symbols">Ticker symbols or null/empty for all of them (if supported)</param>
/// <returns>Web socket, call Dispose to close</returns>
public static IWebSocket GetOrderBookWebSocket(this IExchangeAPI api, Action <ExchangeOrderBook> callback, int maxCount = 20, params string[] symbols)
{
// Notes:
// * Confirm with the Exchange's API docs whether the data in each event is the absolute quantity or differential quantity
// * Receiving an event that removes a price level that is not in your local order book can happen and is normal.
var fullBooks = new ConcurrentDictionary <string, ExchangeOrderBook>();
void applyDelta(SortedDictionary <decimal, ExchangeOrderPrice> deltaValues, SortedDictionary <decimal, ExchangeOrderPrice> bookToEdit)
{
foreach (ExchangeOrderPrice record in deltaValues.Values)
{
if (record.Amount <= 0 || record.Price <= 0)
{
bookToEdit.Remove(record.Price);
}
else
{
bookToEdit[record.Price] = record;
}
}
}
void updateOrderBook(ExchangeOrderBook fullOrderBook, ExchangeOrderBook freshBook)
{
lock (fullOrderBook)
{
// update deltas as long as the full book is at or before the delta timestamp
if (fullOrderBook.SequenceId <= freshBook.SequenceId)
{
applyDelta(freshBook.Asks, fullOrderBook.Asks);
applyDelta(freshBook.Bids, fullOrderBook.Bids);
fullOrderBook.SequenceId = freshBook.SequenceId;
}
}
}
async Task innerCallback(ExchangeOrderBook freshBook)
{
bool foundFullBook = fullBooks.TryGetValue(freshBook.Symbol, out ExchangeOrderBook fullOrderBook);
switch (api.Name)
{
// Fetch an initial book the first time and apply deltas on top
case ExchangeName.Bittrex:
case ExchangeName.Binance:
case ExchangeName.Poloniex:
{
// If we don't have an initial order book for this symbol, fetch it
if (!foundFullBook)
{
fullBooks[freshBook.Symbol] = fullOrderBook = await api.GetOrderBookAsync(freshBook.Symbol, 1000);
fullOrderBook.Symbol = freshBook.Symbol;
}
else
{
updateOrderBook(fullOrderBook, freshBook);
}
break;
}
// First response from exchange will be the full order book.
// Subsequent updates will be deltas
case ExchangeName.Okex:
{
if (!foundFullBook)
{
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
}
else
{
updateOrderBook(fullOrderBook, freshBook);
}
break;
}
// Websocket always returns full order book
case ExchangeName.Huobi:
{
fullBooks[freshBook.Symbol] = fullOrderBook = freshBook;
break;
}
}
fullOrderBook.LastUpdatedUtc = DateTime.UtcNow;
callback(fullOrderBook);
}
IWebSocket socket = api.GetOrderBookDeltasWebSocket(async(b) => await innerCallback(b), maxCount, symbols);
socket.Connected += (s) =>
{
// when we re-connect, we must invalidate the order books, who knows how long we were disconnected
// and how out of date the order books are
fullBooks.Clear();
};
return(socket);
}
public NewExchangeAPI(IExchangeAPI exchangeAPI)
{
this.API = exchangeAPI;
}