protected override async Task Start()
{
while (true)
{
Sum += await m_channel.ReadAsync();
}
}
/// <summary>
/// The method that implements this process
/// </summary>
protected override async Task Start()
{
try
{
while (true)
{
// Grab the next request
var req = await m_requests.ReadAsync();
LOG.DebugFormat("Found request with ID: {0}, channel: {3}, type: {1}, dtype: {2}", req.RequestID, req.RequestType, req.ChannelDataType, req.ChannelID);
var nwc = await LocateChannelHandler(req.ChannelID);
lock (m_lock)
{
LOG.DebugFormat("Registered pending request with ID: {0}, channel: {3}, type: {1}, dtype: {2}", req.RequestID, req.RequestType, req.ChannelDataType, req.ChannelID);
m_pendingRequests[req.ChannelID].Add(req.RequestID, req);
}
try
{
await nwc.WriteAsync(req);
LOG.DebugFormat("Passed req {0}, channel: {3}, with type {1}, dtype: {2}", req.RequestID, req.RequestType, req.ChannelDataType, req.ChannelID);
}
catch (Exception ex)
{
LOG.Error("Failed to send request", ex);
// If the connection closed in some way
// restart the connection and try again
// otherwise:
TrySetException(req.Task, ex);
}
}
}
catch (Exception ex)
{
try { Requests.Dispose(); }
catch { }
if (ex.IsRetiredException())
{
if (m_pendingRequests.Values.Any(x => x.Count > 0))
{
LOG.Fatal("Network client is retired, but there were pending messages in queue");
throw;
}
}
else
{
LOG.Fatal("Crashed network client", ex);
throw;
}
}
}
/// <summary>
/// Registers a desire to read from the channel
/// </summary>
/// <param name="offer">A callback method for offering an item, use null to unconditionally accept</param>
/// <param name="timeout">The time to wait for the operation, use zero to return a timeout immediately if no items can be read. Use a
/// negative span to wait forever.</param>
/// <returns>The async.</returns>
public Task <T> ReadAsync(TimeSpan timeout, ITwoPhaseOffer offer = null)
{
if (offer != null)
{
throw new InvalidOperationException("LatencyHidingReader does not support offers");
}
while (m_readQueue.Count < m_buffersize)
{
m_readQueue.Enqueue(m_parent.ReadAsync(timeout, offer));
}
return(m_readQueue.Dequeue());
}
/// <summary>
/// The process that serializes data from a <see cref="CoCoL.Network.PendingNetworkRequest" /> and sends it into the channel.
/// </summary>
/// <returns>The awaitable task.</returns>
/// <param name="client">The <see cref="System.Net.Sockets.TcpClient"/> to read data from.</param>
/// <param name="stream">The stream to write data to.</param>
/// <param name="channel">The channel to read requests from.</param>
/// <param name="selfid">A string used to identify this process in logs</param>
private static async Task WriterProcess(TcpClient client, Stream stream, IReadChannelEnd <PendingNetworkRequest> channel, string selfid)
{
try
{
var headbuffer = new byte[SMALL_MESSAGE_SIZE];
var json = new Newtonsoft.Json.JsonSerializer();
using (client)
using (stream)
using (channel)
{
while (true)
{
var prnq = await channel.ReadAsync();
var header = new RequestHeader()
{
ChannelID = prnq.ChannelID,
ChannelDataType = prnq.ChannelDataType.AssemblyQualifiedName,
RequestID = prnq.RequestID,
SourceID = prnq.SourceID,
RequestType = prnq.RequestType,
Timeout = prnq.Timeout,
PayloadClassName = prnq.Value == null ? null : prnq.Value.GetType().AssemblyQualifiedName,
NoOffer = prnq.Offer == null
};
ushort headlen;
using (var ms = new MemoryStream(headbuffer, true))
{
// Make space for the size fields
ms.Write(headbuffer, 0, 8 + 2);
using (var tw = new StreamWriter(ms))
using (var jw = new Newtonsoft.Json.JsonTextWriter(tw))
{
json.Serialize(jw, header);
jw.Flush();
await tw.FlushAsync();
headlen = (ushort)(ms.Position - 8 - 2);
}
}
// We write it all into the array before writing to the stream
if (headlen > SMALL_MESSAGE_SIZE - 8 - 2 - 8)
{
throw new Exception("Too larger header");
}
// Make a memory stream for the payload
using (var ms = new MemoryStream())
using (var tw = new StreamWriter(ms))
using (var jw = new Newtonsoft.Json.JsonTextWriter(tw))
{
ulong payloadlen = 0;
if (prnq.Value != null)
{
json.Serialize(jw, prnq.Value);
jw.Flush();
await tw.FlushAsync();
payloadlen = (ulong)ms.Length;
ms.Position = 0;
}
if (payloadlen > MAX_MESSAGE_SIZE)
{
throw new Exception("Too large message payload");
}
ulong packlen = 8uL + 2uL + headlen + 8uL + payloadlen;
Array.Copy(BitConverter.GetBytes(packlen), headbuffer, 8);
Array.Copy(BitConverter.GetBytes(headlen), 0, headbuffer, 8, 2);
Array.Copy(BitConverter.GetBytes(payloadlen), 0, headbuffer, 8 + 2 + headlen, 8);
LOG.DebugFormat("{2}: Sending {0} - {1} request", prnq.RequestID, prnq.RequestType, selfid);
await stream.WriteAsync(headbuffer, 0, headlen + 8 + 2 + 8);
if (payloadlen != 0)
{
await ms.CopyToAsync(stream);
}
LOG.DebugFormat("{4}: Sent {0} - {1} request with {2} bytes to {3}", prnq.RequestID, prnq.RequestType, packlen, client.Client.RemoteEndPoint, selfid);
await stream.FlushAsync();
}
}
}
}
catch (Exception ex)
{
if (!ex.IsRetiredException())
{
LOG.Error("Crashed network client writer side", ex);
throw;
}
else
{
LOG.Info("Stopped network client writer");
}
}
}
