private void disconnect(EpollHandler handler)
{
var os = new Overspan(50);
// detach the handler
var socketHandle = handler.OnDetach();
// unsubscribe from Epoll events
Remove(socketHandle, 0);
// close the socket
if (Syscall.close(socketHandle) < 0)
{
Log.Error($"Call to close(socked) failed: {Stdlib.GetLastError()}");
}
Log.Epoll("[{0}] socked disconnected, closed", socketHandle);
os.Check("disconnect()");
}
public void PollOnce(EpollEvent[] events, int timeoutMode = -1)
{
if (timeoutMode < 0)
{
Log.Epoll("Listener waiting for signals");
}
var count = Syscall.epoll_wait(epfd, events, events.Length, timeoutMode);
if (count < 0)
{
Log.Error($"Call to epoll_wait() failed with code {count}: {Stdlib.GetLastError()}");
return;
}
if (count > 0)
{
Log.Epoll("+" + count);
}
for (var i = 0; i < count; i++)
{
var ev = events[i];
Log.Epoll("Epoll[{0}] got {1} for {2}", i, ev.events, ev.u32);
// find the handler
var socket = (int)ev.u32;
var handler = server.GetHandler(socket);
if (((int)ev.events & disconnectMask) > 0)
{
disconnect(handler);
}
else
if (ev.events.HasFlag(EpollEvents.EPOLLIN))
{
if (socket == listenerSocket)
{
OnReadReady();
Update(socket, GetEvents());
}
else
{
var os = new Overspan(50);
var ret = handler.OnReadReady();
os.Check("OnReadReady()");
if (ret < 0)
{
disconnect(handler);
}
else
{
Update(socket, handler.GetEvents());
}
}
}
else
if (ev.events.HasFlag(EpollEvents.EPOLLOUT))
{
var os = new Overspan(50);
var ret = handler.OnWriteReady();
os.Check("OnWriteReady()");
if (ret < 0)
{
disconnect(handler);
}
else
{
Update(socket, handler.GetEvents());
}
}
}
}
// called either from OnAttach or on EPOLLIN
public int OnReadReady()
{
Log.Epoll("[{0}] OnReadReady()", socketHandle);
if (state != EState.Reading)
{
Log.Error("OnReadReady() in state " + state);
}
if (socketHandle < 0)
{
Log.Error("Error: OnReadReady on detached socket");
return(0);
}
var read = Syscall.read(socketHandle,
IntPtr.Add(bufferPtr, totalRead),
(ulong)(Buffer.Length - totalRead));
Log.Epoll("[{0}] read() returned {1}", socketHandle, read);
if (read < 0)
{
var errno = Stdlib.GetLastError();
if (errno == Errno.EAGAIN || errno == Errno.EWOULDBLOCK || errno == 0)
{
return(0); // continue in the Reading state
}
Log.Error("[{0}] read() socket error {1}", socketHandle, errno);
return(-1); // waiting for the socket to be detached/closed
}
if (read == 0)
{
Log.Epoll("[{0}] peer closed connection", socketHandle);
return(-1);
}
if (totalRead == 0 && processingStarted.Ticks == 0)
{
processingStarted = Stats.Watch.Elapsed;
}
totalRead += (int)read;
if (RequestLength == 0)
{
ParseRequestHeader(totalRead);
}
if (RequestLength == 0 || RequestLength > 0 && totalRead < RequestLength)
{
return((int)read); // continue in the Reading state
}
// done!
//Console.Write('<');
Log.Epoll("[{0}] Read completed, size={1}", socketHandle, RequestLength);
if (RequestLength > MaxRequestSize)
{
MaxRequestSize = RequestLength;
}
// process the request
setProcessing();
Log.Epoll("[{0}] Send to processing, query_id={1}", socketHandle, QueryId);
var os = new Overspan(20);
server.ProcessContext(this);
os.Check(ContextType);
return(0);
}