/// <summary>
/// Decodes each <see cref="RawCapture"/> of a sequence into a <typeparamref name="TRecord"/> object.
/// </summary>
/// <typeparam name="TRecord"></typeparam>
/// <param name="frames">A sequence of values to invoke a transform function on.</param>
/// <param name="tsharkProcess">A decoder process to apply to each element.</param>
/// <param name="datalinkType">The link layer type used in decoding operation. Default is <see cref="DataLinkType.Ethernet"/>.</param>
/// <returns>
/// An IEnumerable<PacketFields> whose elements are the result of invoking the decode function on each element of source.
/// </returns>
/// <remarks>
/// This method is implemented by using deferred execution. The immediate return value is an object that stores all the information
/// that is required to perform the action. The query represented by this method is not executed until the object is enumerated
/// either by calling its GetEnumerator method directly or by using foreach.
/// </remarks>
public static IEnumerable <TRecord> Decode <TRecord>(this IEnumerable <RawCapture> frames, TSharkProcess <TRecord> tsharkProcess, DataLinkType datalinkType = DataLinkType.Ethernet)
{
var pipename = $"ndx.tshark_{new Random().Next(Int32.MaxValue)}";
var wsender = new TSharkSender(pipename, datalinkType);
tsharkProcess.PipeName = pipename;
var decodedPackets = new BlockingCollection <TRecord>();
void PacketDecoded(object sender, TRecord packet)
{
decodedPackets.Add(packet);
}
tsharkProcess.PacketDecoded += PacketDecoded;
tsharkProcess.Start();
if (!wsender.Connected.Wait(5000))
{
throw new InvalidOperationException("Cannot connect to TShark process.");
}
var pumpTask = Task.Run(async() =>
{
foreach (var frame in frames)
{
await wsender.SendAsync(frame);
}
wsender.Close();
});
while (tsharkProcess.IsRunning || decodedPackets.Count > 0)
{
yield return(decodedPackets.Take());
}
}
public TSharkBlock(TSharkProcess <TDecodedFrame> tsharkProcess, DataLinkType datalinkType = DataLinkType.Ethernet)
{
var m_pipename = $"ndx.tshark_{new Random().Next(Int32.MaxValue)}";
m_wsender = new TSharkSender(m_pipename, datalinkType);
m_inputBlock = new ActionBlock <RawCapture>(SendFrame);
m_inputBlock.Completion.ContinueWith((t) => m_wsender.Close());
m_outputBlock = new BufferBlock <TDecodedFrame>();
// create and initialize TSHARK:
m_tshark = tsharkProcess;
m_tshark.PipeName = m_pipename;
m_tshark.PacketDecoded += PacketDecoded;
m_tshark.Start();
m_tshark.Completion.ContinueWith((t) => m_outputBlock.Complete());
m_wsender.Connected.Wait();
}