/// <summary>
///
/// </summary>
/// <param name="dataPoints"></param>
/// <returns></returns>
public static IEnumerable <byte> Compress(IEnumerable <DataPoint <dynamic> > dataPoints)
{
if (dataPoints.Select(_ => _.TimeSeries).Distinct().Count() > 1)
{
throw new Exception("Unable to compress data points: All data points must come from the same time series.");
}
var timeSeries = ByteString.CopyFrom(dataPoints.First().TimeSeries.Value.ToByteArray());
var firstTimestamp = dataPoints.First().Timestamp.Value;
var protobufDataPoints = dataPoints.Select(_ => _.ToProtobuf()).ToArray();
var frame = new Protobuf.TimeSeriesFrame {
TimeSeries = timeSeries, Timestamp = (ulong)firstTimestamp
};
var payload = new Protobuf.TimeSeriesPayload();
payload = payload.Append(protobufDataPoints);
frame.UncompressedPayload = payload;
frame = frame.Compress();
var encoded = frame.ToByteArray();
byte[] length = BitConverter.GetBytes((int)encoded.Length);
return(length.Concat(encoded));
}
