public async Task StreamLargeAmount_100kIterations_WithBufferAndSlowdown_ShouldBeFast()
        {
            var pair      = "BTC/USD";
            var data      = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot  = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source    = new OrderBookSourceMock(snapshot);
            var orderBook = new CryptoOrderBook(pair, source);
            var endTime   = DateTime.MinValue;

            orderBook.OrderBookUpdatedStream.Subscribe(x => endTime = DateTime.UtcNow);

            source.BufferEnabled  = true;
            source.BufferInterval = TimeSpan.FromMilliseconds(1);

            source.LoadSnapshotEnabled      = false;
            orderBook.SnapshotReloadEnabled = false;
            orderBook.ValidityCheckEnabled  = false;
            source.StreamSnapshot();

            var startTime          = DateTime.UtcNow;
            var elapsedInsertingMs = StreamLevels(pair, source, 100000, 500, 500, true);
            var msgInserting       = $"Elapsed time for inserting was: {elapsedInsertingMs} ms";

            _output.WriteLine(msgInserting);

            await Task.Delay(1000);

            var elapsedEnd = endTime.Subtract(startTime).TotalMilliseconds;
            var msg        = $"Elapsed time for processing was: {elapsedEnd} ms";

            _output.WriteLine(msg);

            Assert.True(elapsedEnd < 5000, msgInserting);
            Assert.True(elapsedInsertingMs < 1000, msgInserting);
        }
        public async Task ConnectToSource_ShouldHandleOrderBookCorrectly()
        {
            var url = BinanceValues.ApiWebsocketUrl;

            using (var communicator = new BinanceWebsocketCommunicator(url))
            {
                using (var client = new BinanceWebsocketClient(communicator))
                {
                    var pair = "BTCUSDT";

                    client.SetSubscriptions(
                        new OrderBookDiffSubscription(pair)
                        );

                    var source    = new BinanceOrderBookSource(client);
                    var orderBook = new CryptoOrderBook(pair, source);

                    await communicator.Start();

                    // Binance is special
                    // We need to load snapshot in advance manually via REST call
                    await source.LoadSnapshot(pair);

                    await Task.Delay(TimeSpan.FromSeconds(5));

                    Assert.True(orderBook.BidPrice > 0);
                    Assert.True(orderBook.AskPrice > 0);

                    Assert.NotEmpty(orderBook.BidLevels);
                    Assert.NotEmpty(orderBook.AskLevels);
                }
            }
        }
Exemplo n.º 3
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        public async Task ConnectToSource_ShouldHandleOrderBookCorrectly()
        {
            var url = BitfinexValues.ApiWebsocketUrl;

            using (var communicator = new BitfinexWebsocketCommunicator(url))
            {
                using (var client = new BitfinexWebsocketClient(communicator))
                {
                    var pair = "BTCUSD";

                    var source    = new BitfinexOrderBookSource(client);
                    var orderBook = new CryptoOrderBook(pair, source);

                    await communicator.Start();

                    client.Send(new BookSubscribeRequest(pair, BitfinexPrecision.P0, BitfinexFrequency.Realtime, "100"));

                    await Task.Delay(TimeSpan.FromSeconds(5));

                    Assert.True(orderBook.BidPrice > 0);
                    Assert.True(orderBook.AskPrice > 0);

                    Assert.NotEmpty(orderBook.BidLevels);
                    Assert.NotEmpty(orderBook.AskLevels);
                }
            }
        }
        public void StreamingSnapshot_ShouldHandleCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            var orderBook = new CryptoOrderBook(pair, source);

            source.StreamSnapshot();

            Assert.Equal(500, orderBook.BidLevels.Length);
            Assert.Equal(500, orderBook.AskLevels.Length);

            Assert.Equal(499, orderBook.BidPrice);
            Assert.Equal(1499, orderBook.BidLevels.First().Amount);

            Assert.Equal(501, orderBook.AskPrice);
            Assert.Equal(2501, orderBook.AskLevels.First().Amount);

            var levels = orderBook.Levels;

            foreach (var level in levels)
            {
                Assert.Equal(CryptoPairsHelper.Clean(pair), level.Pair);
            }
        }
Exemplo n.º 5
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        public async Task ConnectToSource_ShouldHandleOrderBookCorrectly()
        {
            var url = CoinbaseValues.ApiWebsocketUrl;

            using (var communicator = new CoinbaseWebsocketCommunicator(url))
            {
                using (var client = new CoinbaseWebsocketClient(communicator))
                {
                    var pair = "BTC-USD";

                    var source    = new CoinbaseOrderBookSource(client);
                    var orderBook = new CryptoOrderBook(pair, source);

                    await communicator.Start();

                    client.Send(new SubscribeRequest(
                                    new [] { pair },
                                    ChannelSubscriptionType.Level2
                                    ));

                    await Task.Delay(TimeSpan.FromSeconds(5));

                    Assert.True(orderBook.BidPrice > 0);
                    Assert.True(orderBook.AskPrice > 0);

                    Assert.NotEmpty(orderBook.BidLevels);
                    Assert.NotEmpty(orderBook.AskLevels);
                }
            }
        }
        public async Task ValidityChecking_Disabling_ShouldWork()
        {
            var pair = "BTC/USD";
            var data = new []
            {
                CreateLevel(pair, 480, 50, CryptoOrderSide.Bid),
                CreateLevel(pair, 520, 50, CryptoOrderSide.Ask),
            };
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);
            var orderBookUpdatedCount = 0;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                ValidityCheckTimeout = TimeSpan.FromMilliseconds(200),
                ValidityCheckEnabled = false
            };

            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                orderBookUpdatedCount++;
            });

            source.StreamSnapshot();
            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 500, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 499, 400, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(TimeSpan.FromMilliseconds(500));

            Assert.Null(source.SnapshotLastPair);
            Assert.Equal(0, source.SnapshotCalledCount);
            Assert.Equal(2, orderBookUpdatedCount);
        }
        public void NegativePrice_ShouldHandleCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.IgnoreDiffsBeforeSnapshot = false;

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, -200, -50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 500, -400, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, -50, -600, CryptoOrderSide.Bid),
                                  CreateLevel(pair, -100, -3350, CryptoOrderSide.Bid)
                                  ));

            Assert.Equal(-50, orderBook.BidPrice);
            Assert.Equal(600, orderBook.BidAmount);

            Assert.Equal(500, orderBook.AskPrice);
            Assert.Equal(400, orderBook.AskAmount);
        }
        private static void HandleQuoteChanged(CryptoOrderBook ob, int levelsCount)
        {
            var bids = ob.BidLevelsPerPrice.Take(levelsCount).SelectMany(x => x.Value).ToArray();
            var asks = ob.AskLevelsPerPrice.Take(levelsCount).SelectMany(x => x.Value).ToArray();

            var max = Math.Max(bids.Length, asks.Length);

            var msg = string.Empty;

            for (int i = 0; i < max; i++)
            {
                var bid = bids.Length > i ? bids[i] : null;
                var ask = asks.Length > i ? asks[i] : null;

                var bidMsg =
                    bid != null ? $"#{i+1} {bid?.Id} " +
                    $"{"p: " + (bid?.Price ?? 0).ToString("#.00#") + " a: " + (bid?.Amount ?? 0).ToString("0.00#")} " +
                    $"[{bid.PriceUpdatedCount}/{bid.AmountUpdatedCount}]"
                        : " ";
                var askMsg =
                    ask != null ? $"#{i+1} {ask?.Id} " +
                    $"{"p: " + (ask?.Price ?? 0).ToString("#.00#") + " a: " + (ask?.Amount ?? 0).ToString("0.00#")} " +
                    $"[{ask.PriceUpdatedCount}/{ask.AmountUpdatedCount}]"
                        : " ";

                bidMsg = $"{bidMsg,50}";
                askMsg = $"{askMsg,50}";

                msg += $"{Environment.NewLine}{bidMsg}  {askMsg}";
            }

            Log.Information($"TOP LEVEL {ob.ExchangeName} {ob.TargetPairOriginal}: {msg}{Environment.NewLine}");
        }
        private static async Task <CryptoOrderBook> StartBitfinex(string pair, bool optimized)
        {
            var url          = BitfinexValues.ApiWebsocketUrl;
            var communicator = new BitfinexWebsocketCommunicator(url)
            {
                Name = "Bitfinex"
            };
            var client = new BitfinexWebsocketClient(communicator);

            var source    = new BitfinexOrderBookL3Source(client);
            var orderBook = new CryptoOrderBook(pair, source, CryptoOrderBookType.L3);

            if (optimized)
            {
                ConfigureOptimized(source, orderBook);
            }

            _ = communicator.Start();

            // Send configuration request to enable server timestamps
            client.Send(new ConfigurationRequest(ConfigurationFlag.Sequencing | ConfigurationFlag.Timestamp));

            // Send subscription request to raw order book data
            client.Send(new Bitfinex.Client.Websocket.Requests.Subscriptions.RawBookSubscribeRequest(pair, "100"));

            return(orderBook);
        }
        public void StreamingSnapshot_DifferentPairs_ShouldHandleCorrectly()
        {
            var pair1    = "BTC/USD";
            var pair2    = "ETH/BTC";
            var data1    = GetOrderBookSnapshotMockData(pair1, 500);
            var data2    = GetOrderBookSnapshotMockData(pair2, 200);
            var data     = data2.Concat(data1).ToArray();
            var now      = CryptoDateUtils.ConvertFromUnixSeconds(1577575307.123451);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2)
            {
                ExchangeName    = "test",
                ServerSequence  = 3,
                ServerTimestamp = now
            };
            var source = new OrderBookSourceMock(snapshot);

            ICryptoOrderBook orderBook1 = new CryptoOrderBook(pair1, source);
            ICryptoOrderBook orderBook2 = new CryptoOrderBook(pair2, source);

            orderBook1.OrderBookUpdatedStream.Subscribe(x =>
            {
                Assert.Equal("test", x.ExchangeName);
                Assert.Equal(3, x.ServerSequence);
                Assert.Equal(now, x.ServerTimestamp);
            });

            orderBook2.OrderBookUpdatedStream.Subscribe(x =>
            {
                Assert.Equal("test", x.ExchangeName);
                Assert.Equal(3, x.ServerSequence);
                Assert.Equal(now, x.ServerTimestamp);
            });

            source.StreamSnapshot();

            Assert.Equal(500, orderBook1.BidLevels.Length);
            Assert.Equal(500, orderBook1.AskLevels.Length);

            Assert.Equal(200, orderBook2.BidLevels.Length);
            Assert.Equal(200, orderBook2.AskLevels.Length);

            Assert.Equal(499, orderBook1.BidLevels.First().Price);
            Assert.Equal(1499, orderBook1.BidLevels.First().Amount);

            Assert.Equal(199, orderBook2.BidLevels.First().Price);
            Assert.Equal(599, orderBook2.BidLevels.First().Amount);

            Assert.Equal(501, orderBook1.AskLevels.First().Price);
            Assert.Equal(2501, orderBook1.AskLevels.First().Amount);

            Assert.Equal(201, orderBook2.AskLevels.First().Price);
            Assert.Equal(1001, orderBook2.AskLevels.First().Amount);

            var levels = orderBook1.Levels;

            foreach (var level in levels)
            {
                Assert.Equal(CryptoPairsHelper.Clean(pair1), level.Pair);
            }
        }
Exemplo n.º 11
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        public async Task AutoSnapshotReloading_ShouldWorkAfterTimeout()
        {
            var url = BitfinexValues.ApiWebsocketUrl;

            using (var communicator = new BitfinexWebsocketCommunicator(url))
            {
                using (var client = new BitfinexWebsocketClient(communicator))
                {
                    var pair = "LTCUSD";

                    var source = new BitfinexOrderBookSource(client)
                    {
                        LoadSnapshotEnabled = true
                    };
                    var orderBook = new CryptoOrderBook(pair, source)
                    {
                        SnapshotReloadTimeout = TimeSpan.FromSeconds(5),
                        SnapshotReloadEnabled = true
                    };

                    await Task.Delay(TimeSpan.FromSeconds(13));

                    Assert.True(orderBook.BidPrice > 0);
                    Assert.True(orderBook.AskPrice > 0);

                    Assert.NotEmpty(orderBook.BidLevels);
                    Assert.NotEmpty(orderBook.AskLevels);
                }
            }
        }
        public void StreamLargeAmount_20kIterations_ShouldBeFast()
        {
            var pair      = "BTC/USD";
            var data      = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot  = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source    = new OrderBookSourceMock(snapshot);
            var orderBook = new CryptoOrderBook(pair, source);

            source.BufferEnabled            = false;
            source.LoadSnapshotEnabled      = false;
            orderBook.SnapshotReloadEnabled = false;
            orderBook.ValidityCheckEnabled  = false;
            source.StreamSnapshot();

            var elapsedMs = StreamLevels(pair, source, 20000, 500, 500);
            var msg       = $"Elapsed time was: {elapsedMs} ms";

            _output.WriteLine(msg);

            Assert.Equal(601, orderBook.BidLevels.Length);
            Assert.Equal(596, orderBook.AskLevels.Length);

            Assert.Equal(499, orderBook.BidPrice);
            Assert.Equal(500, orderBook.AskPrice);

            Assert.Equal(20049, orderBook.BidAmount);
            Assert.Equal(22999, orderBook.AskAmount);

            Assert.True(elapsedMs < 2400, msg);
        }
Exemplo n.º 13
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        public void UpdateDelete_ShouldConstructCorrectOrderBook()
        {
            var pair1 = "BTC/USD";

            var source = new OrderBookSourceMock();

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair1, source);

            orderBook.IgnoreDiffsBeforeSnapshot = false;

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.123, CryptoOrderSide.Ask, null, "ASK1"))
                );

            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.444, CryptoOrderSide.Ask, null, "ASK2"))
                );
            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.555, CryptoOrderSide.Ask, null, "ASK3"))
                );

            var asks = orderBook.FindAskLevelsByPrice(100.111);

            Assert.Equal(3, asks.Length);
            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetDeleteBulk(CryptoOrderBookType.L3, CreateLevel(pair1, null, CryptoOrderSide.Ask, "ASK1"))
                );

            asks = orderBook.FindAskLevelsByPrice(100.111);
            Assert.Equal(2, asks.Length);
            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.444, orderBook.AskAmount);

            source.StreamBulk(
                GetUpdateBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.888, CryptoOrderSide.Ask, null, "ASK2"))
                );

            asks = orderBook.FindAskLevelsByPrice(100.111);
            Assert.Equal(2, asks.Length);
            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.555, orderBook.AskAmount);
        }
        public void DifferentPairs_ShouldNotNotifyAboutOtherPair()
        {
            var pair1 = "BTC/USD";
            var pair2 = "ETH/USD";

            var ob1NotifiedCount = 0;
            var ob2NotifiedCount = 0;

            var data1 = GetOrderBookSnapshotMockData(pair1, 500);

            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data1, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook1 = new CryptoOrderBook(pair1, source)
            {
                DebugEnabled = true
            };
            ICryptoOrderBook orderBook2 = new CryptoOrderBook(pair2, source)
            {
                DebugEnabled = true
            };

            orderBook1.IgnoreDiffsBeforeSnapshot = false;
            orderBook2.IgnoreDiffsBeforeSnapshot = false;

            orderBook1.OrderBookUpdatedStream.Subscribe(x => ob1NotifiedCount++);
            orderBook1.TopLevelUpdatedStream.Subscribe(x => ob1NotifiedCount++);
            orderBook1.BidAskUpdatedStream.Subscribe(x => ob1NotifiedCount++);

            orderBook2.OrderBookUpdatedStream.Subscribe(x => ob2NotifiedCount++);
            orderBook2.TopLevelUpdatedStream.Subscribe(x => ob2NotifiedCount++);
            orderBook2.BidAskUpdatedStream.Subscribe(x => ob2NotifiedCount++);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair1, -200, -50, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 500, -400, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair1, -50, -600, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, -100, -3350, CryptoOrderSide.Bid)
                                  ));

            Assert.Equal(-50, orderBook1.BidPrice);
            Assert.Equal(600, orderBook1.BidAmount);

            Assert.Equal(500, orderBook1.AskPrice);
            Assert.Equal(400, orderBook1.AskAmount);

            Assert.Equal(0, ob2NotifiedCount);
            Assert.Equal(2 * 3, ob1NotifiedCount);
        }
Exemplo n.º 15
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        public void InvalidBidAsk_ShouldBePreserved()
        {
            var pair1 = "BTC/USD";

            var source = new OrderBookSourceMock();

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair1, source);

            orderBook.IgnoreDiffsBeforeSnapshot = false;

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.123, CryptoOrderSide.Ask, null, "ASK1"))
                );

            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100, 0.444, CryptoOrderSide.Bid, null, "BID1"))
                );
            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 103, 0.555, CryptoOrderSide.Bid, null, "BID2"))
                );

            Assert.Equal(103, orderBook.BidPrice);
            Assert.Equal(0.555, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetDeleteBulk(CryptoOrderBookType.L3, CreateLevel(pair1, null, CryptoOrderSide.Bid, "BID2"))
                );

            Assert.Equal(100, orderBook.BidPrice);
            Assert.Equal(0.444, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);
        }
Exemplo n.º 16
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        public void NegativePrice_ShouldHandleCorrectly()
        {
            var pair1 = "BTC/USD";

            var source = new OrderBookSourceMock();

            source.BufferEnabled = false;

            var orderBook = new CryptoOrderBook(pair1, source);

            orderBook.IgnoreDiffsBeforeSnapshot = false;

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100.111, 0.123, CryptoOrderSide.Ask, null, "ASK1"))
                );

            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, -200, 0.444, CryptoOrderSide.Bid, null, "BID1"))
                );
            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, -100, 0.555, CryptoOrderSide.Bid, null, "BID2"))
                );

            Assert.Equal(-100, orderBook.BidPrice);
            Assert.Equal(0.555, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);

            source.StreamBulk(
                GetInsertBulk(CryptoOrderBookType.L3, CreateLevel(pair1, 100, 777, CryptoOrderSide.Bid, null, "BID2"))
                );

            Assert.Equal(100, orderBook.BidPrice);
            Assert.Equal(777, orderBook.BidAmount);
            Assert.Equal(100.111, orderBook.AskPrice);
            Assert.Equal(0.123, orderBook.AskAmount);
        }
        public void FindLevel_ShouldReturnCorrectValue()
        {
            var pair1    = "BTC/USD";
            var pair2    = "ETH/BTC";
            var data1    = GetOrderBookSnapshotMockData(pair1, 500);
            var data2    = GetOrderBookSnapshotMockData(pair2, 200);
            var data     = data2.Concat(data1).ToArray();
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair1, source);

            source.StreamSnapshot();

            Assert.Equal(1000, orderBook.FindBidLevelByPrice(0)?.Amount);
            Assert.Equal(1000, orderBook.FindBidLevelById("0-bid")?.Amount);

            Assert.Equal(3000, orderBook.FindAskLevelByPrice(1000)?.Amount);
            Assert.Equal(3000, orderBook.FindAskLevelById("1000-ask")?.Amount);
        }
        public async Task StreamingDiff_BeforeSnapshot_ShouldDoNothing()
        {
            var pair      = "BTC/USD";
            var source    = new OrderBookSourceMock();
            var orderBook = new CryptoOrderBook(pair, source);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 100, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 55, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 105, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 200, 3000, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(500);

            Assert.Empty(orderBook.BidLevels);
            Assert.Empty(orderBook.AskLevels);

            Assert.Equal(0, orderBook.BidPrice);
            Assert.Equal(0, orderBook.AskPrice);
        }
        public void StreamPriceChanges_1mIterations_ShouldBeFast()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockDataL3(pair, 1000);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L3);
            var source   = new OrderBookSourceMock(snapshot);

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source, CryptoOrderBookType.L3);

            source.BufferEnabled            = false;
            source.LoadSnapshotEnabled      = false;
            orderBook.SnapshotReloadEnabled = false;
            orderBook.ValidityCheckEnabled  = false;
            source.StreamSnapshot();

            var elapsedMs = StreamLevels(pair, source, orderBook, 1000000, 100, 100);
            var msg       = $"Elapsed time was: {elapsedMs} ms";

            _output.WriteLine(msg);

            Assert.True(elapsedMs < 7000, msg);
        }
        public async Task AutoSnapshotReloading_ShouldWorkCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot)
            {
                LoadSnapshotEnabled = true,
                BufferInterval      = TimeSpan.FromMilliseconds(100)
            };

            var orderBook = new CryptoOrderBook(pair, source)
            {
                SnapshotReloadTimeout = TimeSpan.FromMilliseconds(500),
                SnapshotReloadEnabled = true
            };

            await Task.Delay(TimeSpan.FromSeconds(6));

            Assert.Equal(pair, source.SnapshotLastPair);
            Assert.True(source.SnapshotCalledCount >= 4);
        }
        public async Task ConnectToSource_ShouldHandleOrderBookOneByOne()
        {
            var url = BitmexValues.ApiWebsocketUrl;

            using (var communicator = new BitmexWebsocketCommunicator(url))
            {
                using (var client = new BitmexWebsocketClient(communicator))
                {
                    var pair   = "XBTUSD";
                    var called = 0;

                    var source    = new BitmexOrderBookSource(client);
                    var orderBook = new CryptoOrderBook(pair, source)
                    {
                        DebugEnabled = true
                    };

                    orderBook.OrderBookUpdatedStream.Subscribe(x =>
                    {
                        called++;
                        Thread.Sleep(2000);
                    });

                    await communicator.Start();

                    client.Send(new BookSubscribeRequest(pair));

                    await Task.Delay(TimeSpan.FromSeconds(5));

                    Assert.Equal(2, called);

                    await Task.Delay(TimeSpan.FromSeconds(2));

                    Assert.Equal(3, called);
                }
            }
        }
        public async Task StreamFromFile_ShouldBeFast()
        {
            var pair         = "XBTUSD";
            var communicator = new RawFileCommunicator();

            communicator.FileNames = _rawFiles;

            var client = new BitmexWebsocketClient(communicator);
            var source = new BitmexOrderBookSource(client);

            source.LoadSnapshotEnabled = false;
            source.BufferEnabled       = false;

            var orderBook = new CryptoOrderBook(pair, source);

            orderBook.SnapshotReloadEnabled = false;
            orderBook.ValidityCheckEnabled  = false;

            var snapshotCount = 0;
            var diffCount     = 0;

            source.OrderBookSnapshotStream.Subscribe(x => snapshotCount++);
            source.OrderBookStream.Subscribe(x => diffCount++);

            var sw = Stopwatch.StartNew();
            await communicator.Start();

            sw.Stop();

            var elapsedMs = sw.ElapsedMilliseconds;
            var msg       = $"Processed snapshots: {snapshotCount}, diffs: {diffCount}, elapsed time was: {elapsedMs} ms";

            _output.WriteLine(msg);

            Assert.True(elapsedMs < 8000, msg);
        }
        public void StreamingData_ShouldComputeDifferenceCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferEnabled = false;

            var amountDifferenceBid = 0.0;
            var amountDifferenceAsk = 0.0;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.SnapshotReloadEnabled     = false;
            orderBook.ValidityCheckEnabled      = false;
            orderBook.IgnoreDiffsBeforeSnapshot = false;

            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                foreach (var bulk in x.Sources)
                {
                    amountDifferenceBid += bulk.Levels.Where(x => x.Side == CryptoOrderSide.Bid).Sum(x => x.AmountDifference);
                    amountDifferenceAsk += bulk.Levels.Where(x => x.Side == CryptoOrderSide.Ask).Sum(x => x.AmountDifference);
                }
            });

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 100, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 101, 500, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 99, 10, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 98, 20, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 102, 100, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, 200, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 100, 25, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 99, 5, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 101, 250, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, 100, CryptoOrderSide.Ask),

                                  CreateLevel(pair, 100, null, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 102, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 98, 10, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 99, 10, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 103, 400, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 98, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 102, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, CryptoOrderSide.Ask)
                                  ));

            Assert.Equal(35, amountDifferenceBid);
            Assert.Equal(250, amountDifferenceAsk);
        }
        public async Task StreamingFromFile_ShouldHandleCorrectly()
        {
            var pair         = "XBTUSD";
            var communicator = new RawFileCommunicator();

            communicator.FileNames = _rawFiles;

            var client = new BitmexWebsocketClient(communicator);
            var source = new BitmexOrderBookSource(client);

            source.LoadSnapshotEnabled = false;
            source.BufferEnabled       = false;

            var orderBook = new CryptoOrderBook(pair, source);

            orderBook.SnapshotReloadEnabled = false;
            orderBook.ValidityCheckEnabled  = false;

            var receivedUpdate = 0;
            IOrderBookChangeInfo lastReceivedUpdate = null;

            var receivedTopLevel = 0;
            IOrderBookChangeInfo lastReceivedTopLevel = null;

            var receivedBidAskUpdate = 0;
            IOrderBookChangeInfo lastReceivedBidAskUpdate = null;


            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                receivedUpdate++;
                lastReceivedUpdate = x;
            });
            orderBook.TopLevelUpdatedStream.Subscribe(x =>
            {
                receivedTopLevel++;
                lastReceivedTopLevel = x;
            });
            orderBook.BidAskUpdatedStream.Subscribe(x =>
            {
                receivedBidAskUpdate++;
                lastReceivedBidAskUpdate = x;
            });


            await communicator.Start();

            Assert.Equal(3284, orderBook.BidLevels.Length);
            Assert.Equal(4035, orderBook.AskLevels.Length);

            Assert.Equal(6249, orderBook.BidPrice);
            Assert.Equal(163556, orderBook.BidLevels.First().Amount);

            Assert.Equal(6249.5, orderBook.AskPrice);
            Assert.Equal(270526, orderBook.AskLevels.First().Amount);

            Assert.Equal(322703, receivedUpdate);
            Assert.Equal(6249, lastReceivedUpdate?.Quotes?.Bid);
            Assert.Equal(6249.5, lastReceivedUpdate?.Quotes?.Ask);
            Assert.Equal("8799374800", lastReceivedUpdate.Sources[0].Levels[0].Id);
            Assert.Equal(6252, lastReceivedUpdate.Sources[0].Levels[0].Price);

            Assert.Equal(79020, receivedTopLevel);
            Assert.Equal(6249, lastReceivedTopLevel?.Quotes?.Bid);
            Assert.Equal(6249.5, lastReceivedTopLevel?.Quotes?.Ask);
            Assert.Equal("8799375100", lastReceivedTopLevel.Sources[0].Levels[0].Id);
            Assert.Equal(6249, lastReceivedTopLevel.Sources[0].Levels[0].Price);

            Assert.Equal(584, receivedBidAskUpdate);
            Assert.Equal(6249, lastReceivedBidAskUpdate?.Quotes?.Bid);
            Assert.Equal(6249.5, lastReceivedBidAskUpdate?.Quotes?.Ask);
            Assert.Equal("8799375050", lastReceivedBidAskUpdate.Sources[0].Levels[0].Id);
            Assert.Equal(6249.5, lastReceivedBidAskUpdate.Sources[0].Levels[0].Price);

            var levels = orderBook.Levels;

            foreach (var level in levels)
            {
                Assert.Equal(CryptoPairsHelper.Clean(pair), level.Pair);
            }
        }
        public void InvalidBidAsk_ShouldBePreserved()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.IgnoreDiffsBeforeSnapshot = false;

            var changesTopLevel = new List <IOrderBookChangeInfo>();

            orderBook.BidAskUpdatedStream.Subscribe(x => changesTopLevel.Add(x));

            var changes = new List <IOrderBookChangeInfo>();

            orderBook.OrderBookUpdatedStream.Subscribe(x => changes.Add(x));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 100, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 200, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 300, 600, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 205, 60, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 211, 333, CryptoOrderSide.Bid)
                                  ));

            Assert.Equal(211, orderBook.BidPrice);
            Assert.Equal(333, orderBook.BidAmount);

            Assert.Equal(200, orderBook.AskPrice);
            Assert.Equal(400, orderBook.AskAmount);

            Assert.False(orderBook.IsValid());

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 200, CryptoOrderSide.Ask)
                                  ));

            Assert.Equal(211, orderBook.BidPrice);
            Assert.Equal(333, orderBook.BidAmount);

            Assert.Equal(300, orderBook.AskPrice);
            Assert.Equal(600, orderBook.AskAmount);

            Assert.True(orderBook.IsValid());

            Assert.Equal(3, changesTopLevel.Count);
            Assert.True(changesTopLevel[0].Quotes.IsValid());
            Assert.False(changesTopLevel[1].Quotes.IsValid());
            Assert.True(changesTopLevel[2].Quotes.IsValid());

            Assert.Equal(3, changes.Count);
            Assert.True(changes[0].Quotes.IsValid());
            Assert.False(changes[1].Quotes.IsValid());
            Assert.True(changes[2].Quotes.IsValid());
        }
        public void StreamingData_ShouldComputeIndexesCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferEnabled = false;

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.SnapshotReloadEnabled     = false;
            orderBook.ValidityCheckEnabled      = false;
            orderBook.IgnoreDiffsBeforeSnapshot = false;
            orderBook.IsIndexComputationEnabled = true;

            var updatedBidLevels = new List <OrderBookLevel>();
            var updatedAskLevels = new List <OrderBookLevel>();

            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                foreach (var bulk in x.Sources)
                {
                    var bidLevels = bulk.Levels.Where(x => x.Side == CryptoOrderSide.Bid).ToArray();
                    var askLevels = bulk.Levels.Where(x => x.Side == CryptoOrderSide.Ask).ToArray();

                    updatedBidLevels.AddRange(bidLevels);
                    updatedAskLevels.AddRange(askLevels);
                }
            });

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 100, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 101, 500, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 99, 10, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 98, 20, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 102, 100, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, 200, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 100, 25, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 99, 5, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 101, 250, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, 100, CryptoOrderSide.Ask),

                                  CreateLevel(pair, 100, null, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 102, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 98, 10, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 99, 10, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 103, 400, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 98, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 102, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 103, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 100, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 99, CryptoOrderSide.Bid)
                                  ));

            Assert.Equal(0, updatedBidLevels[0].Index);
            Assert.Equal(1, updatedBidLevels[1].Index);
            Assert.Equal(2, updatedBidLevels[2].Index);
            Assert.Equal(0, updatedBidLevels[3].Index);
            Assert.Equal(1, updatedBidLevels[4].Index);
            Assert.Equal(0, updatedBidLevels[5].Index);
            Assert.Equal(2, updatedBidLevels[6].Index);
            Assert.Equal(1, updatedBidLevels[7].Index);
            Assert.Equal(2, updatedBidLevels[8].Index);
            Assert.Equal(0, updatedBidLevels[9].Index);
            Assert.Equal(0, updatedBidLevels[10].Index);

            Assert.Equal(0, updatedAskLevels[0].Index);
            Assert.Equal(1, updatedAskLevels[1].Index);
            Assert.Equal(2, updatedAskLevels[2].Index);
            Assert.Equal(0, updatedAskLevels[3].Index);
            Assert.Equal(2, updatedAskLevels[4].Index);
            Assert.Equal(1, updatedAskLevels[5].Index);
            Assert.Equal(2, updatedAskLevels[6].Index);
            Assert.Equal(1, updatedAskLevels[7].Index);
            Assert.Equal(2, updatedAskLevels[8].Index);
        }
        public async Task StreamingDiff_ShouldHandleCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source);

            source.StreamSnapshot();

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 499.4, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 498.3, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 300.33, 3350, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 500.2, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 503.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 800.123, 1234, CryptoOrderSide.Ask),

                                  CreateLevel(null, 101.1, null, CryptoOrderSide.Bid),
                                  CreateLevel(null, 901.1, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 499, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 450, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 501, 32, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 503.1, 32, CryptoOrderSide.Ask),

                                  CreateLevel(pair, 100, null, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 900, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 0, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 1, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 1000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 999, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(500);

            Assert.NotEmpty(orderBook.BidLevels);
            Assert.NotEmpty(orderBook.AskLevels);

            Assert.Equal(501, orderBook.BidLevels.Length);
            Assert.Equal(501, orderBook.AskLevels.Length);

            Assert.Equal(499.4, orderBook.BidPrice);
            Assert.Equal(500.2, orderBook.AskPrice);

            Assert.Equal(33, orderBook.FindBidLevelByPrice(499)?.Amount);
            Assert.Equal(33, orderBook.FindBidLevelByPrice(450)?.Amount);

            Assert.Equal(32, orderBook.FindAskLevelByPrice(501)?.Amount);
            Assert.Equal(32, orderBook.FindAskLevelByPrice(503.1)?.Amount);

            var notCompleteBid = orderBook.FindBidLevelByPrice(100);

            Assert.Equal(CryptoPairsHelper.Clean(pair), notCompleteBid.Pair);
            Assert.Equal(1100, notCompleteBid.Amount);
            Assert.Equal(3, notCompleteBid.Count);

            var notCompleteAsk = orderBook.FindAskLevelByPrice(900);

            Assert.Equal(CryptoPairsHelper.Clean(pair), notCompleteAsk.Pair);
            Assert.Equal(2900, notCompleteAsk.Amount);
            Assert.Equal(3, notCompleteAsk.Count);

            Assert.Null(orderBook.FindBidLevelByPrice(0));
            Assert.Null(orderBook.FindBidLevelByPrice(1));
            Assert.Null(orderBook.FindAskLevelByPrice(1000));
            Assert.Null(orderBook.FindAskLevelByPrice(999));

            Assert.Null(orderBook.FindBidLevelByPrice(101.1));
            Assert.Null(orderBook.FindAskLevelByPrice(901.1));
        }
        public async Task StreamingDiff_TwoPairs_ShouldHandleCorrectly()
        {
            var pair1 = "BTC/USD";
            var pair2 = "ETH/USD";

            var data1    = GetOrderBookSnapshotMockData(pair1, 500);
            var data2    = GetOrderBookSnapshotMockData(pair2, 200);
            var data     = data2.Concat(data1).ToArray();
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            ICryptoOrderBook orderBook1 = new CryptoOrderBook(pair1, source)
            {
                DebugEnabled = true
            };
            ICryptoOrderBook orderBook2 = new CryptoOrderBook(pair2, source)
            {
                DebugEnabled = true
            };

            source.StreamSnapshot();

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair2, 199.4, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair2, 198.3, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair2, 50.33, 3350, CryptoOrderSide.Bid),

                                  CreateLevel(pair1, 500.2, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair1, 503.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair1, 800.123, 1234, CryptoOrderSide.Ask),

                                  CreateLevel(null, 101.1, null, CryptoOrderSide.Bid),
                                  CreateLevel(null, 901.1, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair1, 499.4, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 498.3, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 300.33, 3350, CryptoOrderSide.Bid),

                                  CreateLevel(pair2, 200.2, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair2, 203.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair2, 250.123, 1234, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair1, 499, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 450, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 501, 32, CryptoOrderSide.Ask),
                                  CreateLevel(pair1, 503.1, 32, CryptoOrderSide.Ask),

                                  CreateLevel(pair1, 100, null, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 900, null, CryptoOrderSide.Ask)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair1, 0, CryptoOrderSide.Bid),
                                  CreateLevel(pair1, 1, CryptoOrderSide.Bid),

                                  CreateLevel(pair2, 0, CryptoOrderSide.Bid),
                                  CreateLevel(pair2, 1, CryptoOrderSide.Bid)
                                  ));

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair2, 400, CryptoOrderSide.Ask),
                                  CreateLevel(pair2, 399, CryptoOrderSide.Ask),

                                  CreateLevel(pair1, 1000, CryptoOrderSide.Ask),
                                  CreateLevel(pair1, 999, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(500);

            Assert.NotEmpty(orderBook1.BidLevels);
            Assert.NotEmpty(orderBook1.AskLevels);

            Assert.Equal(501, orderBook1.BidLevels.Length);
            Assert.Equal(501, orderBook1.AskLevels.Length);

            Assert.Equal(201, orderBook2.BidLevels.Length);
            Assert.Equal(201, orderBook2.AskLevels.Length);

            Assert.Equal(499.4, orderBook1.BidPrice);
            Assert.Equal(500.2, orderBook1.AskPrice);

            Assert.Equal(199.4, orderBook2.BidPrice);
            Assert.Equal(200.2, orderBook2.AskPrice);

            Assert.Equal(33, orderBook1.FindBidLevelByPrice(499)?.Amount);
            Assert.Equal(33, orderBook1.FindBidLevelByPrice(450)?.Amount);

            Assert.Equal(32, orderBook1.FindAskLevelByPrice(501)?.Amount);
            Assert.Equal(32, orderBook1.FindAskLevelByPrice(503.1)?.Amount);

            var notCompleteBid = orderBook1.FindBidLevelByPrice(100);

            Assert.Equal(CryptoPairsHelper.Clean(pair1), notCompleteBid.Pair);
            Assert.Equal(1100, notCompleteBid.Amount);
            Assert.Equal(3, notCompleteBid.Count);

            var notCompleteAsk = orderBook1.FindAskLevelByPrice(900);

            Assert.Equal(CryptoPairsHelper.Clean(pair1), notCompleteAsk.Pair);
            Assert.Equal(2900, notCompleteAsk.Amount);
            Assert.Equal(3, notCompleteAsk.Count);

            Assert.Null(orderBook1.FindBidLevelByPrice(0));
            Assert.Null(orderBook1.FindBidLevelByPrice(1));
            Assert.Null(orderBook1.FindAskLevelByPrice(1000));
            Assert.Null(orderBook1.FindAskLevelByPrice(999));

            Assert.Null(orderBook1.FindBidLevelByPrice(101.1));
            Assert.Null(orderBook1.FindAskLevelByPrice(901.1));

            Assert.Null(orderBook2.FindBidLevelByPrice(101.1));
            Assert.Null(orderBook2.FindAskLevelByPrice(901.1));
        }
        public async Task StreamingData_ShouldNotifyOneByOne()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            source.BufferInterval = TimeSpan.FromMilliseconds(10);

            var notificationCount = 0;

            var changes = new List <IOrderBookChangeInfo>();

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                notificationCount++;
                changes.Add(x);
                Thread.Sleep(2000);
            });

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 499.4, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 500.2, 400, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 499.5, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 300.33, 3350, CryptoOrderSide.Bid)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 503.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 800.123, 1234, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 504.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 800.101, 1234, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            Assert.Equal(1, notificationCount);

            await Task.Delay(2100);

            Assert.Equal(2, notificationCount);

            var firstChange  = changes.First();
            var secondChange = changes[1];

            Assert.Equal(2, firstChange.Levels.Length);
            Assert.Equal(499.4, firstChange.Levels.First().Price);
            Assert.Equal(500.2, firstChange.Levels.Last().Price);

            Assert.Equal(6, secondChange.Levels.Length);
        }
        public async Task StreamingData_ShouldNotifyCorrectly()
        {
            var pair     = "BTC/USD";
            var data     = GetOrderBookSnapshotMockData(pair, 500);
            var snapshot = new OrderBookLevelBulk(OrderBookAction.Insert, data, CryptoOrderBookType.L2);
            var source   = new OrderBookSourceMock(snapshot);

            var notificationCount         = 0;
            var notificationBidAskCount   = 0;
            var notificationTopLevelCount = 0;

            var amountDifferenceBid = 0.0;
            var amountDifferenceAsk = 0.0;

            var changes = new List <IOrderBookChangeInfo>();

            ICryptoOrderBook orderBook = new CryptoOrderBook(pair, source)
            {
                DebugEnabled = true
            };

            orderBook.OrderBookUpdatedStream.Subscribe(x =>
            {
                notificationCount++;
                changes.Add(x);
                foreach (var bulk in x.Sources)
                {
                    amountDifferenceBid += bulk.Levels.Where(x => x.Side == CryptoOrderSide.Bid).Sum(x => x.AmountDifference);
                    amountDifferenceAsk += bulk.Levels.Where(x => x.Side == CryptoOrderSide.Ask).Sum(x => x.AmountDifference);
                }
            });
            orderBook.BidAskUpdatedStream.Subscribe(_ => notificationBidAskCount++);
            orderBook.TopLevelUpdatedStream.Subscribe(_ => notificationTopLevelCount++);

            source.StreamSnapshot();

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 499.4, 50, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 500.2, 400, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 499.5, 600, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 300.33, 3350, CryptoOrderSide.Bid)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetInsertBulkL2(
                                  CreateLevel(pair, 503.1, 3000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 800.123, 1234, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 499, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 450, 33, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 501, 32, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 503.1, 32, CryptoOrderSide.Ask),

                                  CreateLevel(pair, 100, null, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 900, null, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 499.5, 100, CryptoOrderSide.Bid)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 499.5, 200, CryptoOrderSide.Bid)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetUpdateBulkL2(
                                  CreateLevel(pair, 500.2, 22, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            source.StreamBulk(GetDeleteBulkL2(
                                  CreateLevel(pair, 0, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 1, CryptoOrderSide.Bid),
                                  CreateLevel(pair, 1000, CryptoOrderSide.Ask),
                                  CreateLevel(pair, 999, CryptoOrderSide.Ask)
                                  ));

            await Task.Delay(50);

            Assert.Equal(9, notificationCount);
            Assert.Equal(3, notificationBidAskCount);
            Assert.Equal(6, notificationTopLevelCount);

            var firstChange  = changes.First();
            var secondChange = changes[1];

            Assert.Equal(0, firstChange.Levels.First().Price);
            Assert.Equal(501, firstChange.Levels.Last().Price);

            Assert.Equal(499.4, secondChange.Levels.First().Price);
            Assert.Equal(500.2, secondChange.Levels.Last().Price);

            Assert.Equal(623466, amountDifferenceBid);
            Assert.Equal(1368070, amountDifferenceAsk);
        }