protected virtual SocketSentBytes Send(uint maxNumberOfBytesToSend, uint minFragSize, bool onlyAllowedToSendControlPacket)
{
lock (sendLocker_)
{
if (connState_ == ConnectionStateEnum.CS_DISCONNECTED)
{
return(new SocketSentBytes(false, 0, 0));
}
bool anErrorHasOccured = false;
uint sentStandardPacketBytesThisCall = 0;
uint sentControlPacketBytesThisCall = 0;
if (connState_ == ConnectionStateEnum.CS_CONNECTED &&
IsEncryptionLayerReady &&
!(IsBusy && onlyAllowedToSendControlPacket))
{
if (minFragSize < 1)
{
minFragSize = 1;
}
maxNumberOfBytesToSend = GetNextFragSize(maxNumberOfBytesToSend, minFragSize);
bool bWasLongTimeSinceSend = (MpdUtilities.GetTickCount() - lastSent_) > 1000;
lastCalledSend_ = MpdUtilities.GetTickCount();
while (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall < maxNumberOfBytesToSend &&
!anErrorHasOccured && // don't send more than allowed. Also, there should have been no error in earlier loop
(sendbuffer_ != null || controlpacket_queue_.Count != 0 || standartpacket_queue_.Count != 0) && // there must exist something to send
(!onlyAllowedToSendControlPacket || // this means we are allowed to send both types of packets, so proceed
sendbuffer_ != null && currentPacket_is_controlpacket_ || // We are in the progress of sending a control packet. We are always allowed to send those
sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall > 0 &&
(sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall) % minFragSize != 0 || // Once we've started, continue to send until an even minFragsize to minimize packet overhead
sendbuffer_ == null && controlpacket_queue_.Count != 0 || // There's a control packet in queue, and we are not currently sending anything, so we will handle the control packet next
sendbuffer_ != null && !currentPacket_is_controlpacket_ &&
bWasLongTimeSinceSend && controlpacket_queue_.Count != 0 &&
(sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall) < minFragSize // We have waited to long to clean the current packet (which may be a standard packet that is in the way). Proceed no matter what the value of onlyAllowedToSendControlPacket.
)
)
{
// If we are currently not in the progress of sending a packet, we will need to find the next one to send
if (sendbuffer_ == null)
{
Packet curPacket = null;
if (controlpacket_queue_.Count != 0)
{
// There's a control packet to send
currentPacket_is_controlpacket_ = true;
curPacket = controlpacket_queue_.Dequeue();
}
else if (standartpacket_queue_.Count > 0)
{
// There's a standard packet to send
currentPacket_is_controlpacket_ = false;
StandardPacketQueueEntry queueEntry = standartpacket_queue_.Dequeue();
curPacket = queueEntry.Packet;
actualPayloadSize_ = queueEntry.ActualPayloadSize;
// remember this for statistics purposes.
currentPackageIsFromPartFile_ = curPacket.IsFromPartFile;
}
else
{
// if we reach this point, then there's something wrong with the while condition above!
Debug.Assert(false);
MpdUtilities.QueueDebugLogLine(true, ("EMSocket: Couldn't get a new packet! There's an error in the first while condition in EMSocket::Send()"));
return(new SocketSentBytes(true, sentStandardPacketBytesThisCall, sentControlPacketBytesThisCall));
}
// We found a package to send. Get the data to send from the
// package container and dispose of the container.
sendblen_ = curPacket.RealPacketSize;
sendbuffer_ = curPacket.DetachPacket();
sent_ = 0;
curPacket = null;
// encrypting which cannot be done transparent by base class
CryptPrepareSendData(sendbuffer_, sendblen_);
}
// At this point we've got a packet to send in sendbuffer_. Try to send it. Loop until entire packet
// is sent, or until we reach maximum bytes to send for this call, or until we get an error.
// NOTE! If send would block (returns WSAEWOULDBLOCK), we will return from this method INSIDE this loop.
while (sent_ < sendblen_ &&
sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall < maxNumberOfBytesToSend &&
(
!onlyAllowedToSendControlPacket || // this means we are allowed to send both types of packets, so proceed
currentPacket_is_controlpacket_ ||
bWasLongTimeSinceSend &&
(sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall) < minFragSize ||
(sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall) % minFragSize != 0
) &&
!anErrorHasOccured)
{
uint tosend = sendblen_ - sent_;
if (!onlyAllowedToSendControlPacket || currentPacket_is_controlpacket_)
{
if (maxNumberOfBytesToSend >= sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall &&
tosend > maxNumberOfBytesToSend - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall))
{
tosend = maxNumberOfBytesToSend - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall);
}
}
else if (bWasLongTimeSinceSend && (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall) < minFragSize)
{
if (minFragSize >= sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall &&
tosend > minFragSize - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall))
{
tosend = minFragSize - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall);
}
}
else
{
uint nextFragMaxBytesToSent =
GetNextFragSize(sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall,
minFragSize);
if (nextFragMaxBytesToSent >= sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall &&
tosend > nextFragMaxBytesToSent - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall))
{
tosend = nextFragMaxBytesToSent - (sentStandardPacketBytesThisCall + sentControlPacketBytesThisCall);
}
}
Debug.Assert(tosend != 0 && tosend <= sendblen_ - sent_);
//DWORD tempStartSendTick = ::GetTickCount();
lastSent_ = MpdUtilities.GetTickCount();
int result = base.Send(sendbuffer_, Convert.ToInt32(sent_), Convert.ToInt32(tosend)); // deadlake PROXYSUPPORT - changed to AsyncSocketEx
if (result == SOCKET_ERROR)
{
if (SocketErrorCode == SocketError.WouldBlock)
{
IsBusy = true;
// Send() blocked, onsend will be called when ready to send again
return(new SocketSentBytes(true, sentStandardPacketBytesThisCall, sentControlPacketBytesThisCall));
}
else
{
// Send() gave an error
anErrorHasOccured = true;
//DEBUG_ONLY( AddDebugLogLine(true,"EMSocket: An error has occured: %i", error) );
}
}
else
{
// we managed to send some bytes. Perform bookkeeping.
IsBusy = false;
hasSent_ = true;
sent_ += Convert.ToUInt32(result);
// Log send bytes in correct class
if (!currentPacket_is_controlpacket_)
{
sentStandardPacketBytesThisCall += Convert.ToUInt32(result);
if (currentPackageIsFromPartFile_)
{
numberOfSentBytesPartFile_ += Convert.ToUInt32(result);
}
else
{
numberOfSentBytesCompleteFile_ += Convert.ToUInt32(result);
}
}
else
{
sentControlPacketBytesThisCall += Convert.ToUInt32(result);
numberOfSentBytesControlPacket_ += Convert.ToUInt32(result);
}
}
}
if (sent_ == sendblen_)
{
// we are done sending the current package. Delete it and set
// sendbuffer_ to null so a new packet can be fetched.
sendbuffer_ = null;
sendblen_ = 0;
if (!currentPacket_is_controlpacket_)
{
actualPayloadSizeSent_ += actualPayloadSize_;
actualPayloadSize_ = 0;
lastFinishedStandard_ = MpdUtilities.GetTickCount(); // reset timeout
accelerateUpload_ = false; // Safe until told otherwise
}
sent_ = 0;
}
}
}
if (onlyAllowedToSendControlPacket &&
(controlpacket_queue_.Count > 0 ||
sendbuffer_ != null && currentPacket_is_controlpacket_))
{
// enter control packet send queue
// we might enter control packet queue several times for the same package,
// but that costs very little overhead. Less overhead than trying to make sure
// that we only enter the queue once.
MuleApplication.Instance.UploadBandwidthThrottler.QueueForSendingControlPacket(this, HasSent);
}
//CleanSendLatencyList();
return(new SocketSentBytes(!anErrorHasOccured, sentStandardPacketBytesThisCall, sentControlPacketBytesThisCall));
}//lock
}
