/// <summary>
/// Get the K-Line for the specified ticker symbol and the specified time range.
/// </summary>
/// <param name="symbol">The symbol</param>
/// <param name="type">The K-Line type (the length of time represented by a single candlestick)</param>
/// <param name="startTime">Start time</param>
/// <param name="endTime">End time</param>
/// <returns>A list of candlesticks</returns>
public async Task <List <FuturesCandle> > GetKline(string symbol, FuturesKlineType type, DateTime?startTime = null, DateTime?endTime = null)
{
return(await GetKline <FuturesCandle, FuturesCandle, List <FuturesCandle> >(symbol, type, startTime, endTime));
}
/// <summary>
/// Get a customized K-Line for the specified ticker symbol and the specified time range.
/// </summary>
/// <typeparam name="TCandle">The type of the K-Line objects to create that implements both <see cref="IFullCandle"/> and <typeparamref name="TCustom"/>.</typeparam>
/// <typeparam name="TCustom">
/// The (usually user-provided) type of the objects to return.
/// Objects of this type will be returned in the newly created collection.
/// </typeparam>
/// <typeparam name="TCol">The type of the collection that contains <typeparamref name="TCustom"/> objects.</typeparam>
/// <param name="symbol">The symbol</param>
/// <param name="type">The K-Line type (the length of time represented by a single candlestick)</param>
/// <param name="startTime">Start time</param>
/// <param name="endTime">End time</param>
/// <returns>A list of candlesticks</returns>
public async Task <TCol> GetKline <TCandle, TCustom, TCol>(
string symbol,
FuturesKlineType type,
DateTime?startTime = null,
DateTime?endTime = null)
where TCandle : ICandle, TCustom, new()
where TCol : IList <TCustom>, new()
{
var curl = "/api/v1/kline/query";
long st, et;
var param = new Dictionary <string, object>();
DateTime d;
param.Add("symbol", symbol);
param.Add("granularity", (int)type);
if (startTime == null)
{
st = 0;
}
else
{
d = (DateTime)startTime;
st = EpochTime.DateToMilliseconds(d);
param.Add("from", st.ToString());
}
if (endTime == null)
{
et = 0;
}
else
{
d = (DateTime)startTime;
et = EpochTime.DateToMilliseconds(d);
param.Add("to", et.ToString());
}
if (startTime != null && endTime != null && et < st)
{
throw new ArgumentException("End time must be greater than start time");
}
var jobj = await MakeRequest(HttpMethod.Get, curl, 5, false, param);
var klineRaw = jobj.ToObject <List <List <string> > >();
var results = new TCol();
//klineRaw.Reverse();
foreach (var values in klineRaw)
{
var candle = new TCandle
{
Timestamp = EpochTime.MillisecondsToDate(long.Parse(values[0])),
OpenPrice = decimal.Parse(values[1]),
HighPrice = decimal.Parse(values[2]),
LowPrice = decimal.Parse(values[3]),
ClosePrice = decimal.Parse(values[4]),
Volume = decimal.Parse(values[5])
};
if (candle is IKlineCandle <FuturesKlineType> tc)
{
tc.Type = type;
}
else if (candle is IFullKlineCandle <FuturesKlineType> tce)
{
tce.Type = type;
}
results.Add(candle);
}
return(results);
}