public async Task <Stock> GetStockAsync(string ticker)
{
try
{
if (_stockCache.TryGetValue(ticker.ToUpper(), out var cachedStock))
{
if (cachedStock != null && DateTime.UtcNow.Subtract(cachedStock.LastUpdated).TotalSeconds < _cacheTimeSeconds)
{
return(cachedStock);
}
}
HttpResponseMessage task = await _client.GetAsync($"stock/{ticker}/book");
string jsonString = await task.Content.ReadAsStringAsync();
IexResponse response = JsonConvert.DeserializeObject <IexResponse>(jsonString);
var newStock = _mapper.MapIexResponseToStock(response);
if (_stockCache.ContainsKey(ticker.ToUpper()))
{
_stockCache[ticker.ToUpper()] = newStock;
}
else
{
_stockCache.Add(ticker.ToUpper(), newStock);
}
return(newStock);
}
catch (Exception e)
{
return(null);
}
}
public Stock MapIexResponseToStock(IexResponse response)
{
if (response == null)
{
return(null);
}
decimal latestPrice = response.quote.latestPrice.HasValue ? response.quote.latestPrice.Value : 0;
decimal open = response.quote.open.HasValue ? response.quote.open.Value : 0;
decimal close = response.quote.close.HasValue ? response.quote.close.Value : 0;
decimal price = response.quote.calculationPrice == "previousclose" ? close : latestPrice;
decimal change = price - open;
decimal percentageChange = price == 0 ? 0 : change / price * 100;
decimal changeSinceClose = price - close;
decimal percentageChangeSinceClose = price == 0 ? 0 : changeSinceClose / price * 100;
var stock = new Stock()
{
Ticker = response.quote.symbol,
Company = response.quote.companyName,
Price = Math.Round(price, 2),
PE = response.quote.peRatio.HasValue ? response.quote.peRatio.Value : 0,
Week52High = response.quote.week52High.HasValue ? Math.Round(response.quote.week52High.Value, 2) : 0,
Week52Low = response.quote.week52Low.HasValue ? Math.Round(response.quote.week52Low.Value, 2) : 0,
Sector = response.quote.sector,
DailyChange = Math.Round(change, 2),
DailyPercentageChange = Math.Round(percentageChange, 2),
DailyChangeSinceLastClose = Math.Round(changeSinceClose, 2),
DailyPercentageChangeSinceLastClose = Math.Round(percentageChangeSinceClose, 2),
YearToDateChange = response.quote.ytdChange.HasValue ? Math.Round(response.quote.ytdChange.Value, 4) : 0,
LastUpdated = DateTime.UtcNow
};
stock.Eps = stock.PE != 0 ? stock.Price / stock.PE : 0;
return(stock);
}