public Task Handle(MarketDataChangedEvent evt)
{
if (_memoryCache.TryGetValue(evt.AssetPairId, out _))
{
return(Task.CompletedTask);
}
_subject.OnNext(evt);
var assetPairSubject = _realm.Services.GetSubject <MarketDataChangedEvent>($"{MarketDataTopic}.{evt.AssetPairId.ToLower()}");
assetPairSubject.OnNext(evt);
_memoryCache.Set(evt.AssetPairId, evt.AssetPairId, _cacheInterval);
return(Task.CompletedTask);
}
private async Task ProcessLimitOrdersAsync(LimitOrdersMessage message)
{
if (message.Orders == null || !message.Orders.Any())
{
return;
}
HashSet <string> limitOrderIds = message.Orders
.Select(o => o.Order.Id)
.ToHashSet();
foreach (var orderMessage in message.Orders)
{
if (orderMessage.Trades == null || !orderMessage.Trades.Any())
{
continue;
}
string assetPairId = orderMessage.Order.AssetPairId;
AssetPair assetPair = _assetPairsRepository.TryGet(assetPairId);
if (assetPair == null)
{
_log.Error($"Asset pair {assetPairId} not found");
continue;
}
List <LimitOrdersMessage.Trade> allTrades = message.Orders.SelectMany(x => x.Trades).ToList();
string marketDataKey = RedisService.GetMarketDataKey(assetPairId);
string baseVolumeKey = RedisService.GetMarketDataBaseVolumeKey(assetPairId);
string quoteVolumeKey = RedisService.GetMarketDataQuoteVolumeKey(assetPairId);
string priceKey = RedisService.GetMarketDataPriceKey(assetPairId);
foreach (var tradeMessage in orderMessage.Trades.OrderBy(t => t.Timestamp).ThenBy(t => t.Index))
{
long maxIndex = allTrades
.Where(x => x.OppositeOrderId == tradeMessage.OppositeOrderId)
.Max(t => t.Index);
var price = (decimal)tradeMessage.Price;
string priceString = price.ToString(CultureInfo.InvariantCulture);
var nowDate = tradeMessage.Timestamp;
var nowTradeDate = nowDate.AddMilliseconds(tradeMessage.Index);
await Task.WhenAll(
_database.HashSetAsync(marketDataKey, nameof(MarketSlice.LastPrice), priceString),
_database.SortedSetAddAsync(priceKey, RedisExtensions.SerializeWithTimestamp(priceString, nowTradeDate), nowTradeDate.ToUnixTime())
);
var isOppositeOrderIsLimit = limitOrderIds.Contains(tradeMessage.OppositeOrderId);
// If opposite order is market order, then unconditionally takes the given limit order.
// But if both of orders are limit orders, we should take only one of them.
if (isOppositeOrderIsLimit)
{
var isBuyOrder = orderMessage.Order.Volume > 0;
// Takes trade only for the sell limit orders
if (isBuyOrder)
{
continue;
}
}
decimal baseVolume;
decimal quotingVolume;
if (tradeMessage.Asset == assetPair.BaseAssetId)
{
baseVolume = (decimal)tradeMessage.Volume;
quotingVolume = (decimal)tradeMessage.OppositeVolume;
}
else
{
baseVolume = (decimal)tradeMessage.OppositeVolume;
quotingVolume = (decimal)tradeMessage.Volume;
}
if (tradeMessage.Price > 0 && baseVolume > 0 && quotingVolume > 0)
{
double now = nowDate.ToUnixTime();
double from = (nowDate - _marketDataInterval).ToUnixTime();
decimal baseVolumeSum = baseVolume;
decimal quoteVolumeSum = quotingVolume;
decimal priceChange = 0;
decimal highValue = (decimal)tradeMessage.Price;
decimal lowValue = (decimal)tradeMessage.Price;
var tasks = new List <Task>();
var baseVolumesDataTask = _database.SortedSetRangeByScoreAsync(baseVolumeKey, from, now);
var quoteVolumesDataTask = _database.SortedSetRangeByScoreAsync(quoteVolumeKey, from, now);
var priceDataTask = _database.SortedSetRangeByScoreAsync(priceKey, from, now);
await Task.WhenAll(baseVolumesDataTask, quoteVolumesDataTask, priceDataTask);
baseVolumeSum += baseVolumesDataTask.Result
.Where(x => x.HasValue)
.Sum(x => RedisExtensions.DeserializeTimestamped <decimal>(x));
quoteVolumeSum += quoteVolumesDataTask.Result
.Where(x => x.HasValue)
.Sum(x => RedisExtensions.DeserializeTimestamped <decimal>(x));
var currentHigh = priceDataTask.Result.Any(x => x.HasValue)
? priceDataTask.Result
.Where(x => x.HasValue)
.Max(x => RedisExtensions.DeserializeTimestamped <decimal>(x))
: (decimal?)null;
if (currentHigh.HasValue && currentHigh.Value > highValue)
{
highValue = currentHigh.Value;
}
var currentLow = priceDataTask.Result.Any(x => x.HasValue)
? priceDataTask.Result
.Where(x => x.HasValue)
.Min(x => RedisExtensions.DeserializeTimestamped <decimal>(x))
: (decimal?)null;
if (currentLow.HasValue && currentLow.Value < lowValue)
{
lowValue = currentLow.Value;
}
var pricesData = priceDataTask.Result;
if (pricesData.Any() && pricesData[0].HasValue)
{
decimal openPrice = RedisExtensions.DeserializeTimestamped <decimal>(pricesData[0]);
if (openPrice > 0)
{
priceChange = ((decimal)tradeMessage.Price - openPrice) / openPrice;
}
}
tasks.Add(_database.SortedSetAddAsync(baseVolumeKey, RedisExtensions.SerializeWithTimestamp(baseVolume, nowTradeDate), now));
tasks.Add(_database.SortedSetAddAsync(quoteVolumeKey, RedisExtensions.SerializeWithTimestamp(quotingVolume, nowTradeDate), now));
await Task.WhenAll(tasks);
//send event only for the last trade in the order
if (tradeMessage.Index == maxIndex)
{
var evt = new MarketDataChangedEvent
{
AssetPairId = assetPairId,
VolumeBase = baseVolumeSum,
VolumeQuote = quoteVolumeSum,
PriceChange = priceChange,
LastPrice = (decimal)tradeMessage.Price,
High = highValue,
Low = lowValue
};
_cqrsEngine.PublishEvent(evt, MarketDataBoundedContext.Name);
try
{
await _tickerWriter.InsertOrReplaceAsync(new Ticker(assetPairId)
{
VolumeBase = baseVolumeSum,
VolumeQuote = quoteVolumeSum,
PriceChange = priceChange,
LastPrice = (decimal)tradeMessage.Price,
High = highValue,
Low = lowValue,
UpdatedDt = nowTradeDate
});
}
catch (Exception ex)
{
_log.Error(ex, "Error sending ticker to MyNySqlServer", context: evt.ToJson());
}
}
}
}
}
}