internal void SendHailConfirmed()
{
// Allocate memory
HeapMemory memory = MemoryManager.AllocHeapMemory(1);
// Write the header
memory.Buffer[0] = HeaderPacker.Pack(MessageType.HailConfirmed);
// Send confirmation
SendInternal(new ArraySegment <byte>(memory.Buffer, 0, (int)memory.VirtualCount), true);
// Release memory
MemoryManager.DeAlloc(memory);
if (Logging.CurrentLogLevel <= LogLevel.Debug)
{
Logging.LogInfo("Hail confirmation sent to " + EndPoint);
}
}
private void RunPathMTU()
{
_stateLock.EnterReadLock();
try
{
if (State == ConnectionState.Connected && MTU < Config.MaximumMTU && MTUStatus.Attempts < Config.MaxMTUAttempts && (NetTime.Now - MTUStatus.LastAttempt).TotalMilliseconds > Config.MTUAttemptDelay)
{
int attemptedMtu = (int)(MTU * Config.MTUGrowthFactor);
if (attemptedMtu > Config.MaximumMTU)
{
attemptedMtu = Config.MaximumMTU;
}
if (attemptedMtu < Config.MinimumMTU)
{
attemptedMtu = Config.MinimumMTU;
}
MTUStatus.Attempts++;
MTUStatus.LastAttempt = NetTime.Now;
// Allocate memory
HeapMemory memory = MemoryManager.AllocHeapMemory((uint)attemptedMtu);
// Set the header
memory.Buffer[0] = HeaderPacker.Pack(MessageType.MTURequest);
// Send the request
SendInternal(new ArraySegment <byte>(memory.Buffer, 0, (int)memory.VirtualCount), true);
// Dealloc the memory
MemoryManager.DeAlloc(memory);
}
}
finally
{
_stateLock.ExitReadLock();
}
}
public void CreateOutgoingMessage(ArraySegment <byte> payload, bool noMerge, ulong notificationKey)
{
if (payload.Count > connection.MTU)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Tried to send message that was too large. Use a fragmented channel instead. [Size=" + payload.Count + "] [MaxMessageSize=" + config.MaxFragments + "]");
}
return;
}
lock (_sendLock)
{
// Increment the sequence number
_lastOutboundSequenceNumber++;
// Allocate the memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count + 4);
// Write headers
memory.Buffer[0] = HeaderPacker.Pack(MessageType.Data);
memory.Buffer[1] = channelId;
// Write the sequence
memory.Buffer[2] = (byte)_lastOutboundSequenceNumber;
memory.Buffer[3] = (byte)(_lastOutboundSequenceNumber >> 8);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset, memory.Buffer, 4, payload.Count);
// Allocate pointers
HeapPointers pointers = memoryManager.AllocHeapPointers(1);
// Point the first pointer to the memory
pointers.Pointers[0] = memory;
// Send the message to the router. Tell the router to dealloc the memory as the channel no longer needs it.
ChannelRouter.SendMessage(pointers, true, connection, noMerge, memoryManager);
}
}
public HeapPointers CreateOutgoingMessage(ArraySegment <byte> payload, out byte headerSize, out bool dealloc)
{
if (payload.Count > connection.MTU)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Tried to send message that was too large. Use a fragmented channel instead. [Size=" + payload.Count + "] [MaxMessageSize=" + config.MaxFragments + "]");
}
dealloc = false;
headerSize = 0;
return(null);
}
// Set header size
headerSize = 2;
// Allocate the memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count + 2);
// Write headers
memory.Buffer[0] = HeaderPacker.Pack((byte)MessageType.Data, false);
memory.Buffer[1] = channelId;
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset, memory.Buffer, 2, payload.Count);
// Tell the caller to deallc the memory
dealloc = true;
// Allocate pointers
HeapPointers pointers = memoryManager.AllocHeapPointers(1);
// Point the first pointer to the memory
pointers.Pointers[pointers.VirtualOffset] = memory;
return(pointers);
}
internal void SendChallengeResponse()
{
// Set resend values
HandshakeResendAttempts++;
HandshakeLastSendTime = NetTime.Now;
// Calculate the minimum size we can fit the packet in
int minSize = 1 + sizeof(ulong);
// Calculate the actual size with respect to amplification padding
int size = Math.Max(minSize, (int)Config.AmplificationPreventionHandshakePadding);
// Allocate memory
HeapMemory memory = MemoryManager.AllocHeapMemory((uint)size);
// Write the header
memory.Buffer[0] = HeaderPacker.Pack(MessageType.ChallengeResponse);
// Write the challenge response
for (byte i = 0; i < sizeof(ulong); i++)
{
memory.Buffer[1 + i] = ((byte)(ChallengeAnswer >> (i * 8)));
}
// Send the challenge response
SendInternal(new ArraySegment <byte>(memory.Buffer, 0, (int)memory.VirtualCount), true);
// Release memory
MemoryManager.DeAlloc(memory);
// Print debug
if (Logging.CurrentLogLevel <= LogLevel.Debug)
{
Logging.LogInfo("Server " + EndPoint + " challenge of difficulty " + ChallengeDifficulty + " was solved. Answer was sent. [CollidedValue=" + ChallengeAnswer + "]");
}
}
internal void DisconnectInternal(bool sendMessage, bool timeout)
{
#if ALLOW_CONNECTION_STUB
if (IsStub)
{
// NOOP
return;
}
#endif
// TODO: Could be just a normal write lock. The chance of it not being a write in the end is small.
_stateLock.EnterUpgradeableReadLock();
try
{
if (State == ConnectionState.Connected && sendMessage && !timeout)
{
// Send disconnect message
// Allocate memory
HeapMemory memory = MemoryManager.AllocHeapMemory(1);
// Write disconnect header
memory.Buffer[0] = HeaderPacker.Pack(MessageType.Disconnect);
// Send disconnect message
SendInternal(new ArraySegment <byte>(memory.Buffer, 0, (int)memory.VirtualCount), true);
// Release memory
MemoryManager.DeAlloc(memory);
}
if (State != ConnectionState.Disconnected)
{
_stateLock.EnterWriteLock();
try
{
// Set the state to disconnected
State = ConnectionState.Disconnected;
// Release all memory
Release();
}
finally
{
_stateLock.ExitWriteLock();
}
// Remove from global lookup
Socket.RemoveConnection(this);
// Send disconnect to userspace
Socket.PublishEvent(new NetworkEvent()
{
Connection = this,
Socket = Socket,
Type = timeout ? NetworkEventType.Timeout : NetworkEventType.Disconnect,
AllowUserRecycle = false,
ChannelId = 0,
Data = new ArraySegment <byte>(),
InternalMemory = null,
SocketReceiveTime = NetTime.Now,
MemoryManager = MemoryManager,
EndPoint = EndPoint
});
}
}
finally
{
_stateLock.ExitUpgradeableReadLock();
}
}
public HeapPointers HandleIncomingMessagePoll(ArraySegment <byte> payload)
{
// Read the sequence number
ushort sequence = (ushort)(payload.Array[payload.Offset] | (ushort)(payload.Array[payload.Offset + 1] << 8));
// Read the raw fragment data
ushort encodedFragment = (ushort)(payload.Array[payload.Offset + 2] | (ushort)(payload.Array[payload.Offset + 3] << 8));
// The fragmentId is the last 15 least significant bits
ushort fragment = (ushort)(encodedFragment & 32767);
// IsFinal is the most significant bit
bool isFinal = (ushort)((encodedFragment & 32768) >> 15) == 1;
if (fragment >= config.MaxFragments)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("FragmentId was too large. [FragmentId=" + fragment + "] [Config.MaxFragments=" + config.MaxFragments + "]. The fragment was silently dropped, expect a timeout.");
}
return(null);
}
lock (_receiveLock)
{
// If the sequence is older than the last one we sent to user OR the packet is already acked OR the sequence is alive and its complete OR (the sequence is alive AND the fragments is alloced AND the alloced fragment count is larger than the fragment (I.E, the fragment is actually alloced) AND the fragment is not null AND the fragment is not dead))
if (SequencingUtils.Distance(sequence, _incomingLowestAckedSequence, sizeof(ushort)) <= 0 ||
(_incomingAckedSequences.Contains(sequence)) ||
(_receiveSequencer.TryGet(sequence, out PendingIncomingPacketFragmented value) && (value.IsComplete || (value.Fragments.VirtualCount > fragment && value.Fragments.Pointers[value.Fragments.VirtualOffset + fragment] != null))))
{
// We have already acked this message. Ack again
SendAckEncoded(sequence, encodedFragment);
return(null);
}
else
{
// This is a packet after the last. One that is not yet completed
if (!_receiveSequencer.CanUpdateOrSet(sequence))
{
// If we cant update or set, that means the window is full and we are not in the window.
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Incoming packet window is exhausted. Expect delays");
}
return(null);
}
if (!_receiveSequencer.TryGet(sequence, out value))
{
// If this is the first fragment we ever get, index the data.
HeapPointers fragmentPointers = memoryManager.AllocHeapPointers((uint)fragment + 1);
value = new PendingIncomingPacketFragmented()
{
Fragments = fragmentPointers,
Size = isFinal ? (ushort?)(fragment + 1) : null
};
_receiveSequencer.Set(sequence, value);
}
else
{
// If the first fragment we got was fragment 1 / 500. The fragments array will only be of size 128. We need to potentially resize it
if (value.Fragments.Pointers.Length - value.Fragments.VirtualOffset <= fragment)
{
// We need to expand the fragments array.
// Alloc new array
HeapPointers newPointers = memoryManager.AllocHeapPointers((uint)fragment + 1);
// Copy old values
Array.Copy(value.Fragments.Pointers, newPointers.Pointers, value.Fragments.Pointers.Length);
// Return the memory for the old
memoryManager.DeAlloc(value.Fragments);
// Update the index
value = new PendingIncomingPacketFragmented()
{
Fragments = newPointers,
Size = isFinal ? (ushort?)(fragment + 1) : value.Size
};
_receiveSequencer.Update(sequence, value);
}
// We might also have to expand the virtual count
if (value.Fragments.VirtualCount <= fragment)
{
// Update the new virtual count
value.Fragments.VirtualCount = (uint)fragment + 1;
// Update the struct to set the size if it has changed (TODO: Check if needed)
value = new PendingIncomingPacketFragmented()
{
Fragments = value.Fragments,
Size = isFinal ? (ushort?)(fragment + 1) : value.Size
};
_receiveSequencer.Update(sequence, value);
}
}
// If the fragment is null OR the fragment is DEAD
if (value.Fragments.Pointers[value.Fragments.VirtualOffset + fragment] == null)
{
// Alloc some memory for the fragment
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count - 4);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset + 4, memory.Buffer, 0, payload.Count - 4);
// Add fragment to index
value.Fragments.Pointers[value.Fragments.VirtualOffset + fragment] = memory;
}
// Send ack
SendAckEncoded(sequence, encodedFragment);
// If this sequence just completed. Return the memory
if (value.IsComplete)
{
if (sequence == (ushort)(_incomingLowestAckedSequence + 1))
{
// This is the next packet.
do
{
// Remove previous
_incomingAckedSequences.Remove(_incomingLowestAckedSequence);
_incomingLowestAckedSequence++;
}while (_incomingAckedSequences.Contains((ushort)(_incomingLowestAckedSequence + 1)));
}
else
{
// This is a future one
_incomingAckedSequences.Add(sequence);
}
// Get the total size of all fragments
uint totalSize = value.TotalByteSize;
// Alloc memory for that large segment
HeapMemory memory = memoryManager.AllocHeapMemory(totalSize);
// Keep track of where we are, fragments COULD have different sizes.
int bufferPosition = 0;
if (value.Fragments != null)
{
// Copy all the parts
for (int i = 0; i < value.Fragments.VirtualCount; i++)
{
// Copy fragment to final buffer
Buffer.BlockCopy(((HeapMemory)value.Fragments.Pointers[value.Fragments.VirtualOffset + i]).Buffer, (int)((HeapMemory)value.Fragments.Pointers[value.Fragments.VirtualOffset + i]).VirtualOffset, memory.Buffer, bufferPosition, (int)((HeapMemory)value.Fragments.Pointers[value.Fragments.VirtualOffset + i]).VirtualCount);
bufferPosition += (int)((HeapMemory)value.Fragments.Pointers[value.Fragments.VirtualOffset + i]).VirtualCount;
}
}
// Free the memory of all the individual fragments
value.DeAlloc(memoryManager);
// Kill
_receiveSequencer.Remove(sequence);
// Alloc pointers
HeapPointers pointers = memoryManager.AllocHeapPointers(1);
// Alloc a memory wrapper
pointers.Pointers[0] = memoryManager.AllocMemoryWrapper(memory);
return(pointers);
}
return(null);
}
}
}
internal static void HandleIncomingMessage(ArraySegment <byte> payload, Connection connection, SocketConfig config, MemoryManager memoryManager)
{
// This is where all data packets arrive after passing the connection handling.
byte channelId = payload.Array[payload.Offset];
if (channelId < 0 || channelId >= connection.Channels.Length)
{
// ChannelId out of range
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Got message on channel out of range. [ChannelId=" + channelId + "]");
}
return;
}
IChannel channel = connection.Channels[channelId];
if (channel != null)
{
HeapPointers incomingPointers = channel.HandleIncomingMessagePoll(new ArraySegment <byte>(payload.Array, payload.Offset + 1, payload.Count - 1));
if (incomingPointers != null)
{
ushort sequence = (ushort)(payload.Array[payload.Offset] | (ushort)(payload.Array[payload.Offset + 1] << 8)); // TODO: This is already calculated inside HandleIncomingMessagePoll, we could just get it from there instead of doing this again...
// There is new packets
for (int i = 0; i < incomingPointers.VirtualCount; i++)
{
MemoryWrapper wrapper = (MemoryWrapper)incomingPointers.Pointers[i];
HeapMemory memory = null;
if (wrapper.AllocatedMemory != null)
{
memory = wrapper.AllocatedMemory;
}
if (wrapper.DirectMemory != null)
{
// Alloc memory
memory = memoryManager.AllocHeapMemory((uint)wrapper.DirectMemory.Value.Count);
// Copy payload to borrowed memory
Buffer.BlockCopy(wrapper.DirectMemory.Value.Array, wrapper.DirectMemory.Value.Offset, memory.Buffer, 0, wrapper.DirectMemory.Value.Count);
}
if (memory != null)
{
// Send to userspace
connection.Socket.PublishEvent(new NetworkEvent()
{
Connection = connection,
Socket = connection.Socket,
Type = NetworkEventType.Data,
AllowUserRecycle = true,
Data = new ArraySegment <byte>(memory.Buffer, (int)memory.VirtualOffset, (int)memory.VirtualCount),
InternalMemory = memory,
SocketReceiveTime = NetTime.Now,
ChannelId = channelId,
Sequence = sequence,
MemoryManager = memoryManager,
EndPoint = connection.EndPoint
});
}
// Dealloc the wrapper
memoryManager.DeAlloc(wrapper);
}
// Dealloc the pointers
memoryManager.DeAlloc(incomingPointers);
}
}
else
{
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Receive message failed because the channel is not assigned");
}
}
}
private void CreateOutgoingMessageInternal(ArraySegment <byte> payload, bool noMerge, ulong notificationKey)
{
if (payload.Count > connection.MTU)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Tried to send message that was too large. Use a fragmented channel instead. [Size=" + payload.Count + "] [MaxMessageSize=" + config.MaxFragments + "]");
}
return;
}
if (!_sendSequencer.CanSet((ushort)(_lastOutgoingSequence + 1)))
{
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Outgoing packet window is exhausted. Expect delays");
}
// Alloc memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset, memory.Buffer, 0, payload.Count);
// Enqueue it
_pendingSends.Enqueue(new PendingSend()
{
Memory = memory,
NoMerge = noMerge,
NotificationKey = notificationKey
});
}
else
{
// Increment the sequence number
_lastOutgoingSequence++;
// Allocate the memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count + 4);
// Write headers
memory.Buffer[0] = HeaderPacker.Pack(MessageType.Data);
memory.Buffer[1] = channelId;
// Write the sequence
memory.Buffer[2] = (byte)_lastOutgoingSequence;
memory.Buffer[3] = (byte)(_lastOutgoingSequence >> 8);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset, memory.Buffer, 4, payload.Count);
// Add the memory to pending
_sendSequencer.Set(_lastOutgoingSequence, new PendingOutgoingPacket()
{
Attempts = 1,
LastSent = NetTime.Now,
FirstSent = NetTime.Now,
Memory = memory,
NotificationKey = notificationKey
});
// Allocate pointers
HeapPointers pointers = memoryManager.AllocHeapPointers(1);
// Point the first pointer to the memory
pointers.Pointers[0] = memory;
// Send the message to the router. Tell the router to NOT dealloc the memory as the channel needs it for resend purposes.
ChannelRouter.SendMessage(pointers, false, connection, noMerge, memoryManager);
}
}
public HeapPointers HandleIncomingMessagePoll(ArraySegment <byte> payload)
{
// Read the sequence number
ushort sequence = (ushort)(payload.Array[payload.Offset] | (ushort)(payload.Array[payload.Offset + 1] << 8));
lock (_receiveLock)
{
if (SequencingUtils.Distance(sequence, _incomingLowestAckedSequence, sizeof(ushort)) <= 0 || _receiveSequencer.Contains(sequence))
{
// We have already acked this message. Ack again
SendAck(sequence);
return(null);
}
else if (sequence == (ushort)(_incomingLowestAckedSequence + 1))
{
// This is the packet right after
_incomingLowestAckedSequence++;
// Send ack
SendAck(sequence);
uint additionalPackets = 0;
// Count all the additional sequential packets that are ready
for (int i = 1; (_receiveSequencer.TryGet((ushort)(_incomingLowestAckedSequence + i), out PendingIncomingPacket value)); i++)
{
additionalPackets++;
}
// Allocate pointers (alloc size 1, we might need more)
HeapPointers pointers = memoryManager.AllocHeapPointers(1 + additionalPackets);
// Point the first pointer to the memory that is known.
pointers.Pointers[0] = memoryManager.AllocMemoryWrapper(new ArraySegment <byte>(payload.Array, payload.Offset + 2, payload.Count - 2));
for (int i = 0; _receiveSequencer.TryGet((ushort)(_incomingLowestAckedSequence + 1), out PendingIncomingPacket value); i++)
{
// Update lowest incoming
++_incomingLowestAckedSequence;
// Set the memory
pointers.Pointers[1 + i] = memoryManager.AllocMemoryWrapper(value.Memory);
// Kill
_receiveSequencer.Remove(_incomingLowestAckedSequence);
}
return(pointers);
}
else if (SequencingUtils.Distance(sequence, _incomingLowestAckedSequence, sizeof(ushort)) > 0)
{
// Future packet
if (!_receiveSequencer.CanUpdateOrSet(sequence))
{
// If we cant update or set, that means the window is full and we are not in the window.
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Incoming packet window is exhausted. Expect delays");
}
return(null);
}
if (!_receiveSequencer.Contains(sequence))
{
// Alloc payload plus header memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count - 2);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset + 2, memory.Buffer, 0, payload.Count - 2);
// Add to sequencer
_receiveSequencer.Set(sequence, new PendingIncomingPacket()
{
Memory = memory
});
// Send ack
SendAck(sequence);
}
}
return(null);
}
}
private void CheckConnectionResends()
{
_stateLock.EnterReadLock();
try
{
switch (State)
{
case ConnectionState.RequestingConnection:
{
if ((!Config.TimeBasedConnectionChallenge || PreConnectionChallengeSolved) && (NetTime.Now - HandshakeLastSendTime).TotalMilliseconds > Config.ConnectionRequestMinResendDelay && HandshakeResendAttempts <= Config.MaxConnectionRequestResends)
{
HandshakeResendAttempts++;
HandshakeLastSendTime = NetTime.Now;
// Calculate the minimum size we can fit the packet in
int minSize = 1 + Constants.RUFFLES_PROTOCOL_IDENTIFICATION.Length + (Config.TimeBasedConnectionChallenge ? sizeof(ulong) * 3 : 0);
// Calculate the actual size with respect to amplification padding
int size = Math.Max(minSize, (int)Config.AmplificationPreventionHandshakePadding);
// Allocate memory
HeapMemory memory = MemoryManager.AllocHeapMemory((uint)size);
// Write the header
memory.Buffer[0] = HeaderPacker.Pack((byte)MessageType.ConnectionRequest);
// Copy the identification token
Buffer.BlockCopy(Constants.RUFFLES_PROTOCOL_IDENTIFICATION, 0, memory.Buffer, 1, Constants.RUFFLES_PROTOCOL_IDENTIFICATION.Length);
if (Config.TimeBasedConnectionChallenge)
{
// Write the response unix time
for (byte x = 0; x < sizeof(ulong); x++)
{
memory.Buffer[1 + Constants.RUFFLES_PROTOCOL_IDENTIFICATION.Length + x] = ((byte)(PreConnectionChallengeTimestamp >> (x * 8)));
}
// Write counter
for (byte x = 0; x < sizeof(ulong); x++)
{
memory.Buffer[1 + Constants.RUFFLES_PROTOCOL_IDENTIFICATION.Length + sizeof(ulong) + x] = ((byte)(PreConnectionChallengeCounter >> (x * 8)));
}
// Write IV
for (byte x = 0; x < sizeof(ulong); x++)
{
memory.Buffer[1 + Constants.RUFFLES_PROTOCOL_IDENTIFICATION.Length + (sizeof(ulong) * 2) + x] = ((byte)(PreConnectionChallengeIV >> (x * 8)));
}
// Print debug
if (Logging.CurrentLogLevel <= LogLevel.Debug)
{
Logging.LogInfo("Resending ConnectionRequest with challenge [Counter=" + PreConnectionChallengeCounter + "] [IV=" + PreConnectionChallengeIV + "] [Time=" + PreConnectionChallengeTimestamp + "] [Hash=" + HashProvider.GetStableHash64(PreConnectionChallengeTimestamp, PreConnectionChallengeCounter, PreConnectionChallengeIV) + "]");
}
}
else
{
// Print debug
if (Logging.CurrentLogLevel <= LogLevel.Debug)
{
Logging.LogInfo("Resending ConnectionRequest");
}
}
SendInternal(new ArraySegment <byte>(memory.Buffer, 0, (int)memory.VirtualCount), true);
// Release memory
MemoryManager.DeAlloc(memory);
}
}
break;
case ConnectionState.RequestingChallenge:
{
if ((NetTime.Now - HandshakeLastSendTime).TotalMilliseconds > Config.HandshakeResendDelay && HandshakeResendAttempts <= Config.MaxHandshakeResends)
{
// Resend challenge request
SendChallengeRequest();
}
}
break;
case ConnectionState.SolvingChallenge:
{
if ((NetTime.Now - HandshakeLastSendTime).TotalMilliseconds > Config.HandshakeResendDelay && HandshakeResendAttempts <= Config.MaxHandshakeResends)
{
// Resend response
SendChallengeResponse();
}
}
break;
case ConnectionState.Connected:
{
if (!HailStatus.HasAcked && (NetTime.Now - HailStatus.LastAttempt).TotalMilliseconds > Config.HandshakeResendDelay && HailStatus.Attempts <= Config.MaxHandshakeResends)
{
// Resend hail
SendHail();
}
}
break;
}
}
finally
{
_stateLock.ExitReadLock();
}
}
public HeapPointers CreateOutgoingMessage(ArraySegment <byte> payload, out byte headerSize, out bool dealloc)
{
if (payload.Count > connection.MTU)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Tried to send message that was too large. Use a fragmented channel instead. [Size=" + payload.Count + "] [MaxMessageSize=" + config.MaxFragments + "]");
}
dealloc = false;
headerSize = 0;
return(null);
}
lock (_lock)
{
PendingOutgoingPacket unsafeOutgoing = _sendSequencer.GetUnsafe(_lastOutboundSequenceNumber + 1, out bool isSafe);
if (unsafeOutgoing.Alive && !isSafe)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Outgoing packet window is exhausted. Disconnecting");
}
connection.Disconnect(false);
dealloc = false;
headerSize = 0;
return(null);
}
// Increment the sequence number
_lastOutboundSequenceNumber++;
// Set header size
headerSize = 4;
// Allocate the memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count + 4);
// Write headers
memory.Buffer[0] = HeaderPacker.Pack((byte)MessageType.Data, false);
memory.Buffer[1] = channelId;
// Write the sequence
memory.Buffer[2] = (byte)_lastOutboundSequenceNumber;
memory.Buffer[3] = (byte)(_lastOutboundSequenceNumber >> 8);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset, memory.Buffer, 4, payload.Count);
// Add the memory to pending
_sendSequencer[_lastOutboundSequenceNumber] = new PendingOutgoingPacket()
{
Alive = true,
Sequence = _lastOutboundSequenceNumber,
Attempts = 1,
LastSent = DateTime.Now,
FirstSent = DateTime.Now,
Memory = memory
};
// Tell the caller NOT to dealloc the memory, the channel needs it for resend purposes.
dealloc = false;
// Allocate pointers
HeapPointers pointers = memoryManager.AllocHeapPointers(1);
// Point the first pointer to the memory
pointers.Pointers[pointers.VirtualOffset] = memory;
return(pointers);
}
}
internal static void HandleIncomingMessage(ArraySegment <byte> payload, Connection connection, SocketConfig activeConfig, MemoryManager memoryManager)
{
// This is where all data packets arrive after passing the connection handling.
byte channelId = payload.Array[payload.Offset];
if (channelId < 0 || channelId >= connection.Channels.Length)
{
// ChannelId out of range
if (Logging.CurrentLogLevel <= LogLevel.Warning)
{
Logging.LogWarning("Got message on channel out of range. [ChannelId=" + channelId + "]");
}
return;
}
ArraySegment <byte>?incomingMessage = connection.Channels[channelId].HandleIncomingMessagePoll(new ArraySegment <byte>(payload.Array, payload.Offset + 1, payload.Count - 1), out byte headerBytes, out bool hasMore);
connection.IncomingUserBytes += (ulong)payload.Count - headerBytes;
if (incomingMessage != null)
{
// Alloc memory that can be borrowed to userspace
HeapMemory memory = memoryManager.AllocHeapMemory((uint)incomingMessage.Value.Count);
// Copy payload to borrowed memory
Buffer.BlockCopy(incomingMessage.Value.Array, incomingMessage.Value.Offset, memory.Buffer, 0, incomingMessage.Value.Count);
// Send to userspace
connection.Socket.PublishEvent(new NetworkEvent()
{
Connection = connection,
Socket = connection.Socket,
Type = NetworkEventType.Data,
AllowUserRecycle = true,
Data = new ArraySegment <byte>(memory.Buffer, (int)memory.VirtualOffset, (int)memory.VirtualCount),
InternalMemory = memory,
SocketReceiveTime = DateTime.Now,
ChannelId = channelId,
MemoryManager = memoryManager
});
}
if (hasMore)
{
HeapMemory messageMemory = null;
do
{
messageMemory = connection.Channels[channelId].HandlePoll();
if (messageMemory != null)
{
// Send to userspace
connection.Socket.PublishEvent(new NetworkEvent()
{
Connection = connection,
Socket = connection.Socket,
Type = NetworkEventType.Data,
AllowUserRecycle = true,
Data = new ArraySegment <byte>(messageMemory.Buffer, (int)messageMemory.VirtualOffset, (int)messageMemory.VirtualCount),
InternalMemory = messageMemory,
SocketReceiveTime = DateTime.Now,
ChannelId = channelId,
MemoryManager = memoryManager
});
}
}while (messageMemory != null);
}
}
public ArraySegment <byte>?HandleIncomingMessagePoll(ArraySegment <byte> payload, out byte headerBytes, out bool hasMore)
{
// Read the sequence number
ushort sequence = (ushort)(payload.Array[payload.Offset] | (ushort)(payload.Array[payload.Offset + 1] << 8));
// Set the headerBytes
headerBytes = 2;
lock (_lock)
{
if (SequencingUtils.Distance(sequence, _incomingLowestAckedSequence, sizeof(ushort)) <= 0 || _receiveSequencer[sequence].Alive)
{
// We have already acked this message. Ack again
connection.IncomingDuplicatePackets++;
connection.IncomingDuplicateUserBytes += (ulong)payload.Count - 2;
connection.IncomingDuplicateTotalBytes += (ulong)payload.Count + 2;
SendAck(sequence);
hasMore = false;
return(null);
}
else if (sequence == _incomingLowestAckedSequence + 1)
{
// This is the packet right after
// If the one after is alive, we give set hasMore to true
hasMore = _receiveSequencer[_incomingLowestAckedSequence + 2].Alive;
_incomingLowestAckedSequence++;
// Send ack
SendAck(sequence);
return(new ArraySegment <byte>(payload.Array, payload.Offset + 2, payload.Count - 2));
}
else if (SequencingUtils.Distance(sequence, _incomingLowestAckedSequence, sizeof(ushort)) > 0)
{
// Future packet
PendingIncomingPacket unsafeIncoming = _receiveSequencer.GetUnsafe(sequence, out bool isSafe);
if (unsafeIncoming.Alive && !isSafe)
{
if (Logging.CurrentLogLevel <= LogLevel.Error)
{
Logging.LogError("Incoming packet window is exhausted. Disconnecting");
}
connection.Disconnect(false);
hasMore = false;
return(null);
}
else if (!_receiveSequencer[sequence].Alive)
{
// Alloc payload plus header memory
HeapMemory memory = memoryManager.AllocHeapMemory((uint)payload.Count - 2);
// Copy the payload
Buffer.BlockCopy(payload.Array, payload.Offset + 2, memory.Buffer, 0, payload.Count - 2);
// Add to sequencer
_receiveSequencer[sequence] = new PendingIncomingPacket()
{
Alive = true,
Memory = memory,
Sequence = sequence
};
// Send ack
SendAck(sequence);
}
}
hasMore = false;
return(null);
}
}
