Fixed minetest reliable udp implementation (compatible to old clients)

minetest.conf.example

@@ -345,7 +345,10 @@
 # Number of emerge threads to use.  Make this field blank, or increase this number, to use multiple threads.
 # On multiprocessor systems, this will improve mapgen speed greatly, at the cost of slightly buggy caves.
 #num_emerge_threads = 1
-
+# maximum number of packets sent per send step, if you have a slow connection
+# try reducing it, but don't reduce it to a number below double of targeted
+# client number
+#max_packets_per_iteration = 1024
 #
 # Physics stuff
 #

src/client.cpp

@@ -538,7 +538,7 @@ void Client::step(float dtime)
 			writeU16(&data[53], CLIENT_PROTOCOL_VERSION_MAX);
 
 			// Send as unreliable
-			Send(0, data, false);
+			Send(1, data, false);
 		}
 
 		// Not connected, return
@@ -597,7 +597,7 @@ void Client::step(float dtime)
 					writeV3S16(&reply[2+1+6*k], *j);
 					k++;
 				}
-				m_con.Send(PEER_ID_SERVER, 1, reply, true);
+				m_con.Send(PEER_ID_SERVER, 2, reply, true);
 
 				if(i == deleted_blocks.end())
 					break;
@@ -745,7 +745,7 @@ void Client::step(float dtime)
 				reply[2] = 1;
 				writeV3S16(&reply[3], r.p);
 				// Send as reliable
-				m_con.Send(PEER_ID_SERVER, 1, reply, true);
+				m_con.Send(PEER_ID_SERVER, 2, reply, true);
 			}
 		}
 		if(num_processed_meshes > 0)
@@ -840,7 +840,7 @@ void Client::step(float dtime)
 			std::string s = os.str();
 			SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 			// Send as reliable
-			Send(0, data, true);
+			Send(1, data, true);
 		}
 	}
 }
@@ -957,7 +957,7 @@ void Client::request_media(const std::list<std::string> &file_requests)
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	Send(0, data, true);
+	Send(1, data, true);
 	infostream<<"Client: Sending media request list to server ("
 			<<file_requests.size()<<" files)"<<std::endl;
 }
@@ -970,7 +970,7 @@ void Client::received_media()
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	Send(0, data, true);
+	Send(1, data, true);
 	infostream<<"Client: Notifying server that we received all media"
 			<<std::endl;
 }

src/connection.h

@@ -27,6 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/pointer.h"
 #include "util/container.h"
 #include "util/thread.h"
+#include "util/numeric.h"
 #include <iostream>
 #include <fstream>
 #include <list>
@@ -110,26 +111,74 @@ public:
 	{}
 };
 
-#define SEQNUM_MAX 65535
-inline bool seqnum_higher(u16 higher, u16 lower)
+class ProcessedQueued : public BaseException
 {
-	if(lower > higher && lower - higher > SEQNUM_MAX/2){
-		return true;
+public:
+	ProcessedQueued(const char *s):
+		BaseException(s)
+	{}
+};
+
+class IncomingDataCorruption : public BaseException
+{
+public:
+	IncomingDataCorruption(const char *s):
+		BaseException(s)
+	{}
+};
+
+typedef enum MTProtocols {
+	PRIMARY,
+	UDP,
+	MINETEST_RELIABLE_UDP
+} MTProtocols;
+
+#define SEQNUM_MAX 65535
+inline bool seqnum_higher(u16 totest, u16 base)
+{
+	if (totest > base)
+	{
+		if((totest - base) > (SEQNUM_MAX/2))
+			return false;
+		else
+			return true;
+	}
+	else
+	{
+		if((base - totest) > (SEQNUM_MAX/2))
+			return true;
+		else
+			return false;
+	}
+}
+
+inline bool seqnum_in_window(u16 seqnum, u16 next,u16 window_size)
+{
+	u16 window_start = next;
+	u16 window_end   = ( next + window_size ) % (SEQNUM_MAX+1);
+
+	if (window_start < window_end)
+	{
+		return ((seqnum >= window_start) && (seqnum < window_end));
+	}
+	else
+	{
+		return ((seqnum < window_end) || (seqnum >= window_start));
 	}
-	return (higher > lower);
 }
 
 struct BufferedPacket
 {
 	BufferedPacket(u8 *a_data, u32 a_size):
-		data(a_data, a_size), time(0.0), totaltime(0.0)
+		data(a_data, a_size), time(0.0), totaltime(0.0), absolute_send_time(-1)
 	{}
 	BufferedPacket(u32 a_size):
-		data(a_size), time(0.0), totaltime(0.0)
+		data(a_size), time(0.0), totaltime(0.0), absolute_send_time(-1)
 	{}
 	SharedBuffer<u8> data; // Data of the packet, including headers
 	float time; // Seconds from buffering the packet or re-sending
 	float totaltime; // Seconds from buffering the packet
+	unsigned int absolute_send_time;
 	Address address; // Sender or destination
 };
 
@@ -223,6 +272,8 @@ controltype and data description:
 #define CONTROLTYPE_SET_PEER_ID 1
 #define CONTROLTYPE_PING 2
 #define CONTROLTYPE_DISCO 3
+#define CONTROLTYPE_ENABLE_BIG_SEND_WINDOW 4
+
 /*
 ORIGINAL: This is a plain packet with no control and no error
 checking at all.
@@ -261,7 +312,6 @@ with a buffer in the receiving and transmitting end.
 */
 #define TYPE_RELIABLE 3
 #define RELIABLE_HEADER_SIZE 3
-//#define SEQNUM_INITIAL 0x10
 #define SEQNUM_INITIAL 65500
 
 /*
@@ -275,23 +325,35 @@ class ReliablePacketBuffer
 {
 public:
 	ReliablePacketBuffer();
-	void print();
-	bool empty();
-	u32 size();
-	RPBSearchResult findPacket(u16 seqnum);
-	RPBSearchResult notFound();
-	bool getFirstSeqnum(u16 *result);
+
+	bool getFirstSeqnum(u16& result);
+
 	BufferedPacket popFirst();
 	BufferedPacket popSeqnum(u16 seqnum);
-	void insert(BufferedPacket &p);
+	void insert(BufferedPacket &p,u16 next_expected);
+
 	void incrementTimeouts(float dtime);
-	void resetTimedOuts(float timeout);
-	bool anyTotaltimeReached(float timeout);
-	std::list<BufferedPacket> getTimedOuts(float timeout);
+	std::list<BufferedPacket> getTimedOuts(float timeout,
+			unsigned int max_packets);
+
+	void print();
+	bool empty();
+	bool containsPacket(u16 seqnum);
+	RPBSearchResult notFound();
+	u32 size();
+
 
 private:
+	RPBSearchResult findPacket(u16 seqnum);
+
 	std::list<BufferedPacket> m_list;
 	u16 m_list_size;
+
+	u16 m_oldest_non_answered_ack;
+
+	JMutex m_list_mutex;
+
+	unsigned int writeptr;
 };
 
 /*
@@ -313,27 +375,207 @@ public:
 private:
 	// Key is seqnum
 	std::map<u16, IncomingSplitPacket*> m_buf;
+
+	JMutex m_map_mutex;
 };
 
-class Connection;
-
-struct Channel
+struct OutgoingPacket
 {
-	Channel();
-	~Channel();
+	u16 peer_id;
+	u8 channelnum;
+	SharedBuffer<u8> data;
+	bool reliable;
+	bool ack;
 
-	u16 next_outgoing_seqnum;
-	u16 next_incoming_seqnum;
-	u16 next_outgoing_split_seqnum;
+	OutgoingPacket(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_,
+			bool reliable_,bool ack_=false):
+		peer_id(peer_id_),
+		channelnum(channelnum_),
+		data(data_),
+		reliable(reliable_),
+		ack(ack_)
+	{
+	}
+};
+
+enum ConnectionCommandType{
+	CONNCMD_NONE,
+	CONNCMD_SERVE,
+	CONNCMD_CONNECT,
+	CONNCMD_DISCONNECT,
+	CONNCMD_DISCONNECT_PEER,
+	CONNCMD_SEND,
+	CONNCMD_SEND_TO_ALL,
+	CONNCMD_DELETE_PEER,
+	CONCMD_ACK,
+	CONCMD_CREATE_PEER,
+	CONCMD_DISABLE_LEGACY
+};
+
+struct ConnectionCommand
+{
+	enum ConnectionCommandType type;
+	u16 port;
+	Address address;
+	u16 peer_id;
+	u8 channelnum;
+	Buffer<u8> data;
+	bool reliable;
+	bool raw;
+
+	ConnectionCommand(): type(CONNCMD_NONE), peer_id(PEER_ID_INEXISTENT), reliable(false), raw(false) {}
+
+	void serve(u16 port_)
+	{
+		type = CONNCMD_SERVE;
+		port = port_;
+	}
+	void connect(Address address_)
+	{
+		type = CONNCMD_CONNECT;
+		address = address_;
+	}
+	void disconnect()
+	{
+		type = CONNCMD_DISCONNECT;
+	}
+	void disconnect_peer(u16 peer_id_)
+	{
+		type = CONNCMD_DISCONNECT_PEER;
+		peer_id = peer_id_;
+	}
+	void send(u16 peer_id_, u8 channelnum_,
+			SharedBuffer<u8> data_, bool reliable_)
+	{
+		type = CONNCMD_SEND;
+		peer_id = peer_id_;
+		channelnum = channelnum_;
+		data = data_;
+		reliable = reliable_;
+	}
+	void sendToAll(u8 channelnum_, SharedBuffer<u8> data_, bool reliable_)
+	{
+		type = CONNCMD_SEND_TO_ALL;
+		channelnum = channelnum_;
+		data = data_;
+		reliable = reliable_;
+	}
+	void deletePeer(u16 peer_id_)
+	{
+		type = CONNCMD_DELETE_PEER;
+		peer_id = peer_id_;
+	}
+
+	void ack(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_)
+	{
+		type = CONCMD_ACK;
+		peer_id = peer_id_;
+		channelnum = channelnum_;
+		data = data_;
+		reliable = false;
+	}
+
+	void createPeer(u16 peer_id_, SharedBuffer<u8> data_)
+	{
+		type = CONCMD_CREATE_PEER;
+		peer_id = peer_id_;
+		data = data_;
+		channelnum = 0;
+		reliable = true;
+		raw = true;
+	}
+
+	void disableLegacy(u16 peer_id_, SharedBuffer<u8> data_)
+	{
+		type = CONCMD_DISABLE_LEGACY;
+		peer_id = peer_id_;
+		data = data_;
+		channelnum = 0;
+		reliable = true;
+		raw = true;
+	}
+};
+
+class Channel
+{
+
+public:
+	u16 readNextIncomingSeqNum();
+	u16 incNextIncomingSeqNum();
+
+	u16 getOutgoingSequenceNumber(bool& successfull);
+	u16 readOutgoingSequenceNumber();
+	bool putBackSequenceNumber(u16);
+
+	u16 readNextSplitSeqNum();
+	void setNextSplitSeqNum(u16 seqnum);
 	
 	// This is for buffering the incoming packets that are coming in
 	// the wrong order
 	ReliablePacketBuffer incoming_reliables;
 	// This is for buffering the sent packets so that the sender can
 	// re-send them if no ACK is received
-	ReliablePacketBuffer outgoing_reliables;
+	ReliablePacketBuffer outgoing_reliables_sent;
+
+	//queued reliable packets
+	Queue<BufferedPacket> queued_reliables;
+
+	//queue commands prior splitting to packets
+	Queue<ConnectionCommand> queued_commands;
 
 	IncomingSplitBuffer incoming_splits;
+
+	Channel();
+	~Channel();
+
+	void UpdatePacketLossCounter(unsigned int count);
+	void UpdatePacketTooLateCounter();
+	void UpdateBytesSent(unsigned int bytes,unsigned int packages=1);
+	void UpdateBytesLost(unsigned int bytes);
+
+	void UpdateTimers(float dtime);
+
+	const float getCurrentDownloadRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return cur_kbps; };
+	const float getMaxDownloadRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return max_kbps; };
+
+	const float getCurrentLossRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return cur_kbps_lost; };
+	const float getMaxLossRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return max_kbps_lost; };
+
+	const float getAvgDownloadRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return avg_kbps; };
+	const float getAvgLossRateKB()
+		{ JMutexAutoLock lock(m_internal_mutex); return avg_kbps_lost; };
+
+	const unsigned int getWindowSize() const { return window_size; };
+
+	void setWindowSize(unsigned int size) { window_size = size; };
+private:
+	JMutex m_internal_mutex;
+	unsigned int window_size;
+
+	u16 next_incoming_seqnum;
+
+	u16 next_outgoing_seqnum;
+	u16 next_outgoing_split_seqnum;
+
+	unsigned int current_packet_loss;
+	unsigned int current_packet_too_late;
+	unsigned int current_packet_successfull;
+	float packet_loss_counter;
+
+	unsigned int current_bytes_transfered;
+	unsigned int current_bytes_lost;
+	float max_kbps;
+	float cur_kbps;
+	float avg_kbps;
+	float max_kbps_lost;
+	float cur_kbps_lost;
+	float avg_kbps_lost;
+	float bpm_counter;
 };
 
 class Peer;
@@ -360,71 +602,232 @@ public:
 	virtual void deletingPeer(Peer *peer, bool timeout) = 0;
 };
 
-class Peer
+class PeerHelper
+{
+public:
+	PeerHelper();
+	PeerHelper(Peer* peer);
+	~PeerHelper();
+
+	PeerHelper&   operator=(Peer* peer);
+	Peer*         operator->() const;
+	bool          operator!();
+	Peer*         operator&() const;
+	bool          operator!=(void* ptr);
+
+private:
+	Peer* m_peer;
+};
+
+class Connection;
+
+typedef enum rtt_stat_type {
+	MIN_RTT,
+	MAX_RTT,
+	AVG_RTT,
+	MIN_JITTER,
+	MAX_JITTER,
+	AVG_JITTER
+} rtt_stat_type;
+
+class Peer {
+	public:
+		friend class PeerHelper;
+
+		Peer(Address address_,u16 id_,Connection* connection) :
+			id(id_),
+			m_increment_packets_remaining(9),
+			m_increment_bytes_remaining(0),
+			m_pending_deletion(false),
+			m_connection(connection),
+			address(address_),
+			m_ping_timer(0.0),
+			m_last_rtt(-1.0),
+			m_usage(0),
+			m_timeout_counter(0.0),
+			m_last_timeout_check(porting::getTimeMs()),
+			m_has_sent_with_id(false)
+		{
+			m_rtt.avg_rtt = -1.0;
+			m_rtt.jitter_avg = -1.0;
+			m_rtt.jitter_max = 0.0;
+			m_rtt.max_rtt = 0.0;
+			m_rtt.jitter_min = FLT_MAX;
+			m_rtt.min_rtt = FLT_MAX;
+		};
+
+		virtual ~Peer() {
+			JMutexAutoLock usage_lock(m_exclusive_access_mutex);
+			assert(m_usage == 0);
+		};
+
+		// Unique id of the peer
+		u16 id;
+
+		void Drop();
+
+		virtual void PutReliableSendCommand(ConnectionCommand &c,
+						unsigned int max_packet_size) {};
+
+		virtual bool isActive() { return false; };
+
+		virtual bool getAddress(MTProtocols type, Address& toset) = 0;
+
+		void ResetTimeout()
+			{JMutexAutoLock lock(m_exclusive_access_mutex); m_timeout_counter=0.0; };
+
+		bool isTimedOut(float timeout);
+
+		void setSentWithID()
+		{ JMutexAutoLock lock(m_exclusive_access_mutex); m_has_sent_with_id = true; };
+
+		bool hasSentWithID()
+		{ JMutexAutoLock lock(m_exclusive_access_mutex); return m_has_sent_with_id; };
+
+		unsigned int m_increment_packets_remaining;
+		unsigned int m_increment_bytes_remaining;
+
+		virtual u16 getNextSplitSequenceNumber(u8 channel) { return 0; };
+		virtual void setNextSplitSequenceNumber(u8 channel, u16 seqnum) {};
+		virtual SharedBuffer<u8> addSpiltPacket(u8 channel,
+												BufferedPacket toadd,
+												bool reliable)
+				{
+					fprintf(stderr,"Peer: addSplitPacket called, this is supposed to be never called!\n");
+					return SharedBuffer<u8>(0);
+				};
+
+		virtual bool Ping(float dtime, SharedBuffer<u8>& data) { return false; };
+
+		virtual float getStat(rtt_stat_type type) const {
+			switch (type) {
+				case MIN_RTT:
+					return m_rtt.min_rtt;
+				case MAX_RTT:
+					return m_rtt.max_rtt;
+				case AVG_RTT:
+					return m_rtt.avg_rtt;
+				case MIN_JITTER:
+					return m_rtt.jitter_min;
+				case MAX_JITTER:
+					return m_rtt.jitter_max;
+				case AVG_JITTER:
+					return m_rtt.jitter_avg;
+			}
+			return -1;
+		}
+	protected:
+		virtual void reportRTT(float rtt) {};
+
+		void RTTStatistics(float rtt,
+							std::string profiler_id="",
+							unsigned int num_samples=1000);
+
+		bool IncUseCount();
+		void DecUseCount();
+
+		JMutex m_exclusive_access_mutex;
+
+		bool m_pending_deletion;
+
+		Connection* m_connection;
+
+		// Address of the peer
+		Address address;
+
+		// Ping timer
+		float m_ping_timer;
+	private:
+
+		struct rttstats {
+			float jitter_min;
+			float jitter_max;
+			float jitter_avg;
+			float min_rtt;
+			float max_rtt;
+			float avg_rtt;
+		};
+
+		rttstats m_rtt;
+		float    m_last_rtt;
+
+		// current usage count
+		unsigned int m_usage;
+
+		// Seconds from last receive
+		float m_timeout_counter;
+
+		u32 m_last_timeout_check;
+
+		bool m_has_sent_with_id;
+};
+
+class UDPPeer : public Peer
 {
 public:
 
-	Peer(u16 a_id, Address a_address);
-	virtual ~Peer();
+	friend class PeerHelper;
+	friend class ConnectionReceiveThread;
+	friend class ConnectionSendThread;
 
+	UDPPeer(u16 a_id, Address a_address, Connection* connection);
+	virtual ~UDPPeer();
+
+	void PutReliableSendCommand(ConnectionCommand &c,
+							unsigned int max_packet_size);
+
+	bool isActive()
+	{ return ((hasSentWithID()) && (!m_pending_deletion)); };
+
+	bool getAddress(MTProtocols type, Address& toset);
+
+	void setNonLegacyPeer()
+	{ m_legacy_peer = false; }
+
+	bool getLegacyPeer()
+	{ return m_legacy_peer; }
+
+	u16 getNextSplitSequenceNumber(u8 channel);
+	void setNextSplitSequenceNumber(u8 channel, u16 seqnum);
+
+	SharedBuffer<u8> addSpiltPacket(u8 channel,
+									BufferedPacket toadd,
+									bool reliable);
+protected:
 	/*
 		Calculates avg_rtt and resend_timeout.
-
 		rtt=-1 only recalculates resend_timeout
 	*/
 	void reportRTT(float rtt);
 
-	Channel channels[CHANNEL_COUNT];
+	void RunCommandQueues(
+					unsigned int max_packet_size,
+					unsigned int maxcommands,
+					unsigned int maxtransfer);
 
-	// Address of the peer
-	Address address;
-	// Unique id of the peer
-	u16 id;
-	// Seconds from last receive
-	float timeout_counter;
-	// Ping timer
-	float ping_timer;
+	float getResendTimeout()
+		{ JMutexAutoLock lock(m_exclusive_access_mutex); return resend_timeout; }
+
+	void setResendTimeout(float timeout)
+		{ JMutexAutoLock lock(m_exclusive_access_mutex); resend_timeout = timeout; }
+	bool Ping(float dtime,SharedBuffer<u8>& data);
+
+	Channel channels[CHANNEL_COUNT];
+private:
 	// This is changed dynamically
 	float resend_timeout;
-	// Updated when an ACK is received
-	float avg_rtt;
-	// This is set to true when the peer has actually sent something
-	// with the id we have given to it
-	bool has_sent_with_id;
 
-	float m_sendtime_accu;
-	float m_max_packets_per_second;
-	int m_num_sent;
-	int m_max_num_sent;
+	bool processReliableSendCommand(
+					ConnectionCommand &c,
+					unsigned int max_packet_size);
 
-	// Updated from configuration by Connection
-	float congestion_control_aim_rtt;
-	float congestion_control_max_rate;
-	float congestion_control_min_rate;
-private:
+	bool m_legacy_peer;
 };
 
 /*
 	Connection
 */
 
-struct OutgoingPacket
-{
-	u16 peer_id;
-	u8 channelnum;
-	SharedBuffer<u8> data;
-	bool reliable;
-
-	OutgoingPacket(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_,
-			bool reliable_):
-		peer_id(peer_id_),
-		channelnum(channelnum_),
-		data(data_),
-		reliable(reliable_)
-	{
-	}
-};
-
 enum ConnectionEventType{
 	CONNEVENT_NONE,
 	CONNEVENT_DATA_RECEIVED,
@@ -485,76 +888,108 @@ struct ConnectionEvent
 	}
 };
 
-enum ConnectionCommandType{
-	CONNCMD_NONE,
-	CONNCMD_SERVE,
-	CONNCMD_CONNECT,
-	CONNCMD_DISCONNECT,
-	CONNCMD_SEND,
-	CONNCMD_SEND_TO_ALL,
-	CONNCMD_DELETE_PEER,
+class ConnectionSendThread : public JThread {
+
+public:
+	friend class UDPPeer;
+
+	ConnectionSendThread(Connection* parent,
+							unsigned int max_packet_size, float timeout);
+
+	void * Thread       ();
+
+	void Trigger();
+
+	void setPeerTimeout(float peer_timeout)
+		{ m_timeout = peer_timeout; }
+
+private:
+	void runTimeouts    (float dtime);
+	void rawSend        (const BufferedPacket &packet);
+	bool rawSendAsPacket(u16 peer_id, u8 channelnum,
+							SharedBuffer<u8> data, bool reliable);
+
+	void processReliableCommand (ConnectionCommand &c);
+	void processNonReliableCommand (ConnectionCommand &c);
+	void serve          (u16 port);
+	void connect        (Address address);
+	void disconnect     ();
+	void disconnect_peer(u16 peer_id);
+	void send           (u16 peer_id, u8 channelnum,
+							SharedBuffer<u8> data);
+	void sendReliable   (ConnectionCommand &c);
+	void sendToAll      (u8 channelnum,
+							SharedBuffer<u8> data);
+	void sendToAllReliable(ConnectionCommand &c);
+
+	void sendPackets    (float dtime);
+
+	void sendAsPacket   (u16 peer_id, u8 channelnum,
+							SharedBuffer<u8> data,bool ack=false);
+
+	void sendAsPacketReliable(BufferedPacket& p, Channel* channel);
+
+	bool packetsQueued();
+
+	Connection*           m_connection;
+	unsigned int          m_max_packet_size;
+	float                 m_timeout;
+	Queue<OutgoingPacket> m_outgoing_queue;
+	JSemaphore            m_send_sleep_semaphore;
+
+	unsigned int          m_iteration_packets_avaialble;
+	unsigned int          m_max_commands_per_iteration;
+	unsigned int          m_max_data_packets_per_iteration;
+	unsigned int          m_max_packets_requeued;
 };
 
-struct ConnectionCommand
-{
-	enum ConnectionCommandType type;
-	u16 port;
-	Address address;
-	u16 peer_id;
-	u8 channelnum;
-	Buffer<u8> data;
-	bool reliable;
+class ConnectionReceiveThread : public JThread {
+public:
+	ConnectionReceiveThread(Connection* parent,
+							unsigned int max_packet_size);
 
-	ConnectionCommand(): type(CONNCMD_NONE) {}
+	void * Thread       ();
 
-	void serve(u16 port_)
-	{
-		type = CONNCMD_SERVE;
-		port = port_;
-	}
-	void connect(Address address_)
-	{
-		type = CONNCMD_CONNECT;
-		address = address_;
-	}
-	void disconnect()
-	{
-		type = CONNCMD_DISCONNECT;
-	}
-	void send(u16 peer_id_, u8 channelnum_,
-			SharedBuffer<u8> data_, bool reliable_)
-	{
-		type = CONNCMD_SEND;
-		peer_id = peer_id_;
-		channelnum = channelnum_;
-		data = data_;
-		reliable = reliable_;
-	}
-	void sendToAll(u8 channelnum_, SharedBuffer<u8> data_, bool reliable_)
-	{
-		type = CONNCMD_SEND_TO_ALL;
-		channelnum = channelnum_;
-		data = data_;
-		reliable = reliable_;
-	}
-	void deletePeer(u16 peer_id_)
-	{
-		type = CONNCMD_DELETE_PEER;
-		peer_id = peer_id_;
-	}
+private:
+	void receive        ();
+
+	// Returns next data from a buffer if possible
+	// If found, returns true; if not, false.
+	// If found, sets peer_id and dst
+	bool getFromBuffers (u16 &peer_id, SharedBuffer<u8> &dst);
+
+	bool checkIncomingBuffers(Channel *channel, u16 &peer_id,
+							SharedBuffer<u8> &dst);
+
+	/*
+		Processes a packet with the basic header stripped out.
+		Parameters:
+			packetdata: Data in packet (with no base headers)
+			peer_id: peer id of the sender of the packet in question
+			channelnum: channel on which the packet was sent
+			reliable: true if recursing into a reliable packet
+	*/
+	SharedBuffer<u8> processPacket(Channel *channel,
+							SharedBuffer<u8> packetdata, u16 peer_id,
+							u8 channelnum, bool reliable);
+
+
+	Connection*           m_connection;
+	unsigned int          m_max_packet_size;
 };
 
-class Connection: public JThread
+class Connection
 {
 public:
+	friend class ConnectionSendThread;
+	friend class ConnectionReceiveThread;
+
 	Connection(u32 protocol_id, u32 max_packet_size, float timeout, bool ipv6);
 	Connection(u32 protocol_id, u32 max_packet_size, float timeout, bool ipv6,
 			PeerHandler *peerhandler);
 	~Connection();
-	void * Thread();
 
 	/* Interface */
-
 	ConnectionEvent getEvent();
 	ConnectionEvent waitEvent(u32 timeout_ms);
 	void putCommand(ConnectionCommand &c);
@@ -572,68 +1007,53 @@ public:
 	Address GetPeerAddress(u16 peer_id);
 	float GetPeerAvgRTT(u16 peer_id);
 	void DeletePeer(u16 peer_id);
+	const u32 GetProtocolID() const { return m_protocol_id; };
+	const std::string getDesc();
 
-private:
-	void putEvent(ConnectionEvent &e);
-	void processCommand(ConnectionCommand &c);
-	void send(float dtime);
-	void receive();
-	void runTimeouts(float dtime);
-	void serve(u16 port);
-	void connect(Address address);
-	void disconnect();
-	void sendToAll(u8 channelnum, SharedBuffer<u8> data, bool reliable);
-	void send(u16 peer_id, u8 channelnum, SharedBuffer<u8> data, bool reliable);
-	void sendAsPacket(u16 peer_id, u8 channelnum,
-			SharedBuffer<u8> data, bool reliable);
-	void rawSendAsPacket(u16 peer_id, u8 channelnum,
-			SharedBuffer<u8> data, bool reliable);
-	void rawSend(const BufferedPacket &packet);
-	Peer* getPeer(u16 peer_id);
-	Peer* getPeerNoEx(u16 peer_id);
-	std::list<Peer*> getPeers();
-	bool getFromBuffers(u16 &peer_id, SharedBuffer<u8> &dst);
-	// Returns next data from a buffer if possible
-	// If found, returns true; if not, false.
-	// If found, sets peer_id and dst
-	bool checkIncomingBuffers(Channel *channel, u16 &peer_id,
-			SharedBuffer<u8> &dst);
-	/*
-		Processes a packet with the basic header stripped out.
-		Parameters:
-			packetdata: Data in packet (with no base headers)
-			peer_id: peer id of the sender of the packet in question
-			channelnum: channel on which the packet was sent
-			reliable: true if recursing into a reliable packet
-	*/
-	SharedBuffer<u8> processPacket(Channel *channel,
-			SharedBuffer<u8> packetdata, u16 peer_id,
-			u8 channelnum, bool reliable);
+protected:
+	PeerHelper getPeer(u16 peer_id);
+	PeerHelper getPeerNoEx(u16 peer_id);
+	u16   lookupPeer(Address& sender);
+
+	u16 createPeer(Address& sender, MTProtocols protocol, int fd);
+	UDPPeer*  createServerPeer(Address& sender);
 	bool deletePeer(u16 peer_id, bool timeout);
 
-	Queue<OutgoingPacket> m_outgoing_queue;
-	MutexedQueue<ConnectionEvent> m_event_queue;
+	void SetPeerID(u16 id){ m_peer_id = id; }
+
+	void sendAck(u16 peer_id, u8 channelnum, u16 seqnum);
+
+	void PrintInfo(std::ostream &out);
+	void PrintInfo();
+
+	std::list<u16> getPeerIDs();
+
+	UDPSocket m_udpSocket;
 	MutexedQueue<ConnectionCommand> m_command_queue;
 
-	u32 m_protocol_id;
-	u32 m_max_packet_size;
-	float m_timeout;
-	UDPSocket m_socket;
+	void putEvent(ConnectionEvent &e);
+
+private:
+	std::list<Peer*> getPeers();
+
+	MutexedQueue<ConnectionEvent> m_event_queue;
+
 	u16 m_peer_id;
+	u32 m_protocol_id;
 	
 	std::map<u16, Peer*> m_peers;
 	JMutex m_peers_mutex;
 
+	ConnectionSendThread m_sendThread;
+	ConnectionReceiveThread m_receiveThread;
+
+	JMutex m_info_mutex;
+
 	// Backwards compatibility
 	PeerHandler *m_bc_peerhandler;
 	int m_bc_receive_timeout;
 
-	void SetPeerID(u16 id){ m_peer_id = id; }
-	u32 GetProtocolID(){ return m_protocol_id; }
-	void PrintInfo(std::ostream &out);
-	void PrintInfo();
-	std::string getDesc();
-	u16 m_indentation;
+	bool m_shutting_down;
 };
 
 } // namespace

src/defaultsettings.cpp

@@ -172,6 +172,8 @@ void set_default_settings(Settings *settings)
 
 	// Server stuff
 	// "map-dir" doesn't exist by default.
+	settings->setDefault("workaround_window_size","5");
+	settings->setDefault("max_packets_per_iteration","1024");
 	settings->setDefault("port", "30000");
 	settings->setDefault("default_game", "minetest");
 	settings->setDefault("motd", "");

src/log.cpp

@@ -93,6 +93,7 @@ static std::string get_lev_string(enum LogMessageLevel lev)
 
 void log_printline(enum LogMessageLevel lev, const std::string &text)
 {
+	log_threadnamemutex.Lock();
 	std::string threadname = "(unknown thread)";
 	std::map<threadid_t, std::string>::const_iterator i;
 	i = log_threadnames.find(get_current_thread_id());
@@ -108,6 +109,7 @@ void log_printline(enum LogMessageLevel lev, const std::string &text)
 		out->printLog(os.str(), lev);
 		out->printLog(lev, text);
 	}
+	log_threadnamemutex.Unlock();
 }
 
 class Logbuf : public std::streambuf

src/server.cpp

@@ -90,14 +90,15 @@ public:
 
 void * ServerThread::Thread()
 {
-	ThreadStarted();
-
 	log_register_thread("ServerThread");
 
 	DSTACK(__FUNCTION_NAME);
-
 	BEGIN_DEBUG_EXCEPTION_HANDLER
 
+	m_server->AsyncRunStep(true);
+
+	ThreadStarted();
+
 	while(!StopRequested())
 	{
 		try{
@@ -1018,7 +1019,7 @@ void Server::step(float dtime)
 	}
 }
 
-void Server::AsyncRunStep()
+void Server::AsyncRunStep(bool initial_step)
 {
 	DSTACK(__FUNCTION_NAME);
 
@@ -1035,7 +1036,7 @@ void Server::AsyncRunStep()
 		SendBlocks(dtime);
 	}
 
-	if(dtime < 0.001)
+	if((dtime < 0.001) && (initial_step == false))
 		return;
 
 	g_profiler->add("Server::AsyncRunStep with dtime (num)", 1);
@@ -1528,7 +1529,7 @@ void Server::AsyncRunStep()
 				memcpy((char*)&reply[2], unreliable_data.c_str(),
 						unreliable_data.size());
 				// Send as unreliable
-				m_con.Send(client->peer_id, 0, reply, false);
+				m_con.Send(client->peer_id, 1, reply, false);
 			}
 
 			/*if(reliable_data.size() > 0 || unreliable_data.size() > 0)
@@ -3721,7 +3722,7 @@ void Server::SendHUDAdd(u16 peer_id, u32 id, HudElement *form)
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	m_con.Send(peer_id, 0, data, true);
+	m_con.Send(peer_id, 1, data, true);
 }
 
 void Server::SendHUDRemove(u16 peer_id, u32 id)
@@ -3736,7 +3737,8 @@ void Server::SendHUDRemove(u16 peer_id, u32 id)
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	m_con.Send(peer_id, 0, data, true);
+
+	m_con.Send(peer_id, 1, data, true);
 }
 
 void Server::SendHUDChange(u16 peer_id, u32 id, HudElementStat stat, void *value)
@@ -4204,7 +4206,7 @@ void Server::SendBlockNoLock(u16 peer_id, MapBlock *block, u8 ver, u16 net_proto
 	/*
 		Send packet
 	*/
-	m_con.Send(peer_id, 1, reply, true);
+	m_con.Send(peer_id, 2, reply, true);
 }
 
 void Server::SendBlocks(float dtime)
@@ -4566,7 +4568,7 @@ void Server::sendRequestedMedia(u16 peer_id,
 				<<" size=" <<s.size()<<std::endl;
 		SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 		// Send as reliable
-		m_con.Send(peer_id, 0, data, true);
+		m_con.Send(peer_id, 2, data, true);
 	}
 }
 

src/server.h

@@ -330,7 +330,7 @@ public:
 	// Actual processing is done in an another thread.
 	void step(float dtime);
 	// This is run by ServerThread and does the actual processing
-	void AsyncRunStep();
+	void AsyncRunStep(bool initial_step=false);
 	void Receive();
 	void ProcessData(u8 *data, u32 datasize, u16 peer_id);