src/network/connection.h

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef CONNECTION_HEADER
  21 #define CONNECTION_HEADER
  22
  23 #include "irrlichttypes_bloated.h"
  24 #include "socket.h"
  25 #include "exceptions.h"
  26 #include "constants.h"
  27 #include "network/networkpacket.h"
  28 #include "util/pointer.h"
  29 #include "util/container.h"
  30 #include "util/thread.h"
  31 #include "util/numeric.h"
  32 #include <iostream>
  33 #include <fstream>
  34 #include <list>
  35 #include <map>
  36
  37 class NetworkPacket;
  38
  39 namespace con
  40 {
  41
  42 /*
  43         Exceptions
  44 */
  45 class NotFoundException : public BaseException
  46 {
  47 public:
  48         NotFoundException(const char *s):
  49                 BaseException(s)
  50         {}
  51 };
  52
  53 class PeerNotFoundException : public BaseException
  54 {
  55 public:
  56         PeerNotFoundException(const char *s):
  57                 BaseException(s)
  58         {}
  59 };
  60
  61 class ConnectionException : public BaseException
  62 {
  63 public:
  64         ConnectionException(const char *s):
  65                 BaseException(s)
  66         {}
  67 };
  68
  69 class ConnectionBindFailed : public BaseException
  70 {
  71 public:
  72         ConnectionBindFailed(const char *s):
  73                 BaseException(s)
  74         {}
  75 };
  76
  77 class InvalidIncomingDataException : public BaseException
  78 {
  79 public:
  80         InvalidIncomingDataException(const char *s):
  81                 BaseException(s)
  82         {}
  83 };
  84
  85 class InvalidOutgoingDataException : public BaseException
  86 {
  87 public:
  88         InvalidOutgoingDataException(const char *s):
  89                 BaseException(s)
  90         {}
  91 };
  92
  93 class NoIncomingDataException : public BaseException
  94 {
  95 public:
  96         NoIncomingDataException(const char *s):
  97                 BaseException(s)
  98         {}
  99 };
 100
 101 class ProcessedSilentlyException : public BaseException
 102 {
 103 public:
 104         ProcessedSilentlyException(const char *s):
 105                 BaseException(s)
 106         {}
 107 };
 108
 109 class ProcessedQueued : public BaseException
 110 {
 111 public:
 112         ProcessedQueued(const char *s):
 113                 BaseException(s)
 114         {}
 115 };
 116
 117 class IncomingDataCorruption : public BaseException
 118 {
 119 public:
 120         IncomingDataCorruption(const char *s):
 121                 BaseException(s)
 122         {}
 123 };
 124
 125 typedef enum MTProtocols {
 126         MTP_PRIMARY,
 127         MTP_UDP,
 128         MTP_MINETEST_RELIABLE_UDP
 129 } MTProtocols;
 130
 131 #define SEQNUM_MAX 65535
 132 inline bool seqnum_higher(u16 totest, u16 base)
 133 {
 134         if (totest > base)
 135         {
 136                 if ((totest - base) > (SEQNUM_MAX/2))
 137                         return false;
 138                 else
 139                         return true;
 140         }
 141         else
 142         {
 143                 if ((base - totest) > (SEQNUM_MAX/2))
 144                         return true;
 145                 else
 146                         return false;
 147         }
 148 }
 149
 150 inline bool seqnum_in_window(u16 seqnum, u16 next,u16 window_size)
 151 {
 152         u16 window_start = next;
 153         u16 window_end   = ( next + window_size ) % (SEQNUM_MAX+1);
 154
 155         if (window_start < window_end)
 156         {
 157                 return ((seqnum >= window_start) && (seqnum < window_end));
 158         }
 159         else
 160         {
 161                 return ((seqnum < window_end) || (seqnum >= window_start));
 162         }
 163 }
 164
 165 struct BufferedPacket
 166 {
 167         BufferedPacket(u8 *a_data, u32 a_size):
 168                 data(a_data, a_size), time(0.0), totaltime(0.0), absolute_send_time(-1),
 169                 resend_count(0)
 170         {}
 171         BufferedPacket(u32 a_size):
 172                 data(a_size), time(0.0), totaltime(0.0), absolute_send_time(-1),
 173                 resend_count(0)
 174         {}
 175         Buffer<u8> data; // Data of the packet, including headers
 176         float time; // Seconds from buffering the packet or re-sending
 177         float totaltime; // Seconds from buffering the packet
 178         u64 absolute_send_time;
 179         Address address; // Sender or destination
 180         unsigned int resend_count;
 181 };
 182
 183 // This adds the base headers to the data and makes a packet out of it
 184 BufferedPacket makePacket(Address &address, u8 *data, u32 datasize,
 185                 u32 protocol_id, u16 sender_peer_id, u8 channel);
 186 BufferedPacket makePacket(Address &address, SharedBuffer<u8> &data,
 187                 u32 protocol_id, u16 sender_peer_id, u8 channel);
 188
 189 // Add the TYPE_ORIGINAL header to the data
 190 SharedBuffer<u8> makeOriginalPacket(
 191                 SharedBuffer<u8> data);
 192
 193 // Split data in chunks and add TYPE_SPLIT headers to them
 194 std::list<SharedBuffer<u8> > makeSplitPacket(
 195                 SharedBuffer<u8> data,
 196                 u32 chunksize_max,
 197                 u16 seqnum);
 198
 199 // Depending on size, make a TYPE_ORIGINAL or TYPE_SPLIT packet
 200 // Increments split_seqnum if a split packet is made
 201 std::list<SharedBuffer<u8> > makeAutoSplitPacket(
 202                 SharedBuffer<u8> data,
 203                 u32 chunksize_max,
 204                 u16 &split_seqnum);
 205
 206 // Add the TYPE_RELIABLE header to the data
 207 SharedBuffer<u8> makeReliablePacket(
 208                 SharedBuffer<u8> data,
 209                 u16 seqnum);
 210
 211 struct IncomingSplitPacket
 212 {
 213         IncomingSplitPacket()
 214         {
 215                 time = 0.0;
 216                 reliable = false;
 217         }
 218         // Key is chunk number, value is data without headers
 219         std::map<u16, SharedBuffer<u8> > chunks;
 220         u32 chunk_count;
 221         float time; // Seconds from adding
 222         bool reliable; // If true, isn't deleted on timeout
 223
 224         bool allReceived()
 225         {
 226                 return (chunks.size() == chunk_count);
 227         }
 228 };
 229
 230 /*
 231 === NOTES ===
 232
 233 A packet is sent through a channel to a peer with a basic header:
 234 TODO: Should we have a receiver_peer_id also?
 235         Header (7 bytes):
 236         [0] u32 protocol_id
 237         [4] u16 sender_peer_id
 238         [6] u8 channel
 239 sender_peer_id:
 240         Unique to each peer.
 241         value 0 (PEER_ID_INEXISTENT) is reserved for making new connections
 242         value 1 (PEER_ID_SERVER) is reserved for server
 243         these constants are defined in constants.h
 244 channel:
 245         The lower the number, the higher the priority is.
 246         Only channels 0, 1 and 2 exist.
 247 */
 248 #define BASE_HEADER_SIZE 7
 249 #define CHANNEL_COUNT 3
 250 /*
 251 Packet types:
 252
 253 CONTROL: This is a packet used by the protocol.
 254 - When this is processed, nothing is handed to the user.
 255         Header (2 byte):
 256         [0] u8 type
 257         [1] u8 controltype
 258 controltype and data description:
 259         CONTROLTYPE_ACK
 260                 [2] u16 seqnum
 261         CONTROLTYPE_SET_PEER_ID
 262                 [2] u16 peer_id_new
 263         CONTROLTYPE_PING
 264         - There is no actual reply, but this can be sent in a reliable
 265           packet to get a reply
 266         CONTROLTYPE_DISCO
 267 */
 268 #define TYPE_CONTROL 0
 269 #define CONTROLTYPE_ACK 0
 270 #define CONTROLTYPE_SET_PEER_ID 1
 271 #define CONTROLTYPE_PING 2
 272 #define CONTROLTYPE_DISCO 3
 273 #define CONTROLTYPE_ENABLE_BIG_SEND_WINDOW 4
 274
 275 /*
 276 ORIGINAL: This is a plain packet with no control and no error
 277 checking at all.
 278 - When this is processed, it is directly handed to the user.
 279         Header (1 byte):
 280         [0] u8 type
 281 */
 282 #define TYPE_ORIGINAL 1
 283 #define ORIGINAL_HEADER_SIZE 1
 284 /*
 285 SPLIT: These are sequences of packets forming one bigger piece of
 286 data.
 287 - When processed and all the packet_nums 0...packet_count-1 are
 288   present (this should be buffered), the resulting data shall be
 289   directly handed to the user.
 290 - If the data fails to come up in a reasonable time, the buffer shall
 291   be silently discarded.
 292 - These can be sent as-is or atop of a RELIABLE packet stream.
 293         Header (7 bytes):
 294         [0] u8 type
 295         [1] u16 seqnum
 296         [3] u16 chunk_count
 297         [5] u16 chunk_num
 298 */
 299 #define TYPE_SPLIT 2
 300 /*
 301 RELIABLE: Delivery of all RELIABLE packets shall be forced by ACKs,
 302 and they shall be delivered in the same order as sent. This is done
 303 with a buffer in the receiving and transmitting end.
 304 - When this is processed, the contents of each packet is recursively
 305   processed as packets.
 306         Header (3 bytes):
 307         [0] u8 type
 308         [1] u16 seqnum
 309
 310 */
 311 #define TYPE_RELIABLE 3
 312 #define RELIABLE_HEADER_SIZE 3
 313 #define SEQNUM_INITIAL 65500
 314
 315 /*
 316         A buffer which stores reliable packets and sorts them internally
 317         for fast access to the smallest one.
 318 */
 319
 320 typedef std::list<BufferedPacket>::iterator RPBSearchResult;
 321
 322 class ReliablePacketBuffer
 323 {
 324 public:
 325         ReliablePacketBuffer();
 326
 327         bool getFirstSeqnum(u16& result);
 328
 329         BufferedPacket popFirst();
 330         BufferedPacket popSeqnum(u16 seqnum);
 331         void insert(BufferedPacket &p,u16 next_expected);
 332
 333         void incrementTimeouts(float dtime);
 334         std::list<BufferedPacket> getTimedOuts(float timeout,
 335                         unsigned int max_packets);
 336
 337         void print();
 338         bool empty();
 339         bool containsPacket(u16 seqnum);
 340         RPBSearchResult notFound();
 341         u32 size();
 342
 343
 344 private:
 345         RPBSearchResult findPacket(u16 seqnum);
 346
 347         std::list<BufferedPacket> m_list;
 348         u32 m_list_size;
 349
 350         u16 m_oldest_non_answered_ack;
 351
 352         Mutex m_list_mutex;
 353 };
 354
 355 /*
 356         A buffer for reconstructing split packets
 357 */
 358
 359 class IncomingSplitBuffer
 360 {
 361 public:
 362         ~IncomingSplitBuffer();
 363         /*
 364                 Returns a reference counted buffer of length != 0 when a full split
 365                 packet is constructed. If not, returns one of length 0.
 366         */
 367         SharedBuffer<u8> insert(BufferedPacket &p, bool reliable);
 368
 369         void removeUnreliableTimedOuts(float dtime, float timeout);
 370
 371 private:
 372         // Key is seqnum
 373         std::map<u16, IncomingSplitPacket*> m_buf;
 374
 375         Mutex m_map_mutex;
 376 };
 377
 378 struct OutgoingPacket
 379 {
 380         u16 peer_id;
 381         u8 channelnum;
 382         SharedBuffer<u8> data;
 383         bool reliable;
 384         bool ack;
 385
 386         OutgoingPacket(u16 peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_,
 387                         bool reliable_,bool ack_=false):
 388                 peer_id(peer_id_),
 389                 channelnum(channelnum_),
 390                 data(data_),
 391                 reliable(reliable_),
 392                 ack(ack_)
 393         {
 394         }
 395 };
 396
 397 enum ConnectionCommandType{
 398         CONNCMD_NONE,
 399         CONNCMD_SERVE,
 400         CONNCMD_CONNECT,
 401         CONNCMD_DISCONNECT,
 402         CONNCMD_DISCONNECT_PEER,
 403         CONNCMD_SEND,
 404         CONNCMD_SEND_TO_ALL,
 405         CONCMD_ACK,
 406         CONCMD_CREATE_PEER,
 407         CONCMD_DISABLE_LEGACY
 408 };
 409
 410 struct ConnectionCommand
 411 {
 412         enum ConnectionCommandType type;
 413         Address address;
 414         u16 peer_id;
 415         u8 channelnum;
 416         Buffer<u8> data;
 417         bool reliable;
 418         bool raw;
 419
 420         ConnectionCommand(): type(CONNCMD_NONE), peer_id(PEER_ID_INEXISTENT), reliable(false), raw(false) {}
 421
 422         void serve(Address address_)
 423         {
 424                 type = CONNCMD_SERVE;
 425                 address = address_;
 426         }
 427         void connect(Address address_)
 428         {
 429                 type = CONNCMD_CONNECT;
 430                 address = address_;
 431         }
 432         void disconnect()
 433         {
 434                 type = CONNCMD_DISCONNECT;
 435         }
 436         void disconnect_peer(u16 peer_id_)
 437         {
 438                 type = CONNCMD_DISCONNECT_PEER;
 439                 peer_id = peer_id_;
 440         }
 441         void send(u16 peer_id_, u8 channelnum_,
 442                         NetworkPacket* pkt, bool reliable_)
 443         {
 444                 type = CONNCMD_SEND;
 445                 peer_id = peer_id_;
 446                 channelnum = channelnum_;
 447                 data = pkt->oldForgePacket();
 448                 reliable = reliable_;
 449         }
 450
 451         void ack(u16 peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_)
 452         {
 453                 type = CONCMD_ACK;
 454                 peer_id = peer_id_;
 455                 channelnum = channelnum_;
 456                 data = data_;
 457                 reliable = false;
 458         }
 459
 460         void createPeer(u16 peer_id_, const SharedBuffer<u8> &data_)
 461         {
 462                 type = CONCMD_CREATE_PEER;
 463                 peer_id = peer_id_;
 464                 data = data_;
 465                 channelnum = 0;
 466                 reliable = true;
 467                 raw = true;
 468         }
 469
 470         void disableLegacy(u16 peer_id_, const SharedBuffer<u8> &data_)
 471         {
 472                 type = CONCMD_DISABLE_LEGACY;
 473                 peer_id = peer_id_;
 474                 data = data_;
 475                 channelnum = 0;
 476                 reliable = true;
 477                 raw = true;
 478         }
 479 };
 480
 481 class Channel
 482 {
 483
 484 public:
 485         u16 readNextIncomingSeqNum();
 486         u16 incNextIncomingSeqNum();
 487
 488         u16 getOutgoingSequenceNumber(bool& successfull);
 489         u16 readOutgoingSequenceNumber();
 490         bool putBackSequenceNumber(u16);
 491
 492         u16 readNextSplitSeqNum();
 493         void setNextSplitSeqNum(u16 seqnum);
 494
 495         // This is for buffering the incoming packets that are coming in
 496         // the wrong order
 497         ReliablePacketBuffer incoming_reliables;
 498         // This is for buffering the sent packets so that the sender can
 499         // re-send them if no ACK is received
 500         ReliablePacketBuffer outgoing_reliables_sent;
 501
 502         //queued reliable packets
 503         std::queue<BufferedPacket> queued_reliables;
 504
 505         //queue commands prior splitting to packets
 506         std::deque<ConnectionCommand> queued_commands;
 507
 508         IncomingSplitBuffer incoming_splits;
 509
 510         Channel();
 511         ~Channel();
 512
 513         void UpdatePacketLossCounter(unsigned int count);
 514         void UpdatePacketTooLateCounter();
 515         void UpdateBytesSent(unsigned int bytes,unsigned int packages=1);
 516         void UpdateBytesLost(unsigned int bytes);
 517         void UpdateBytesReceived(unsigned int bytes);
 518
 519         void UpdateTimers(float dtime, bool legacy_peer);
 520
 521         const float getCurrentDownloadRateKB()
 522                 { MutexAutoLock lock(m_internal_mutex); return cur_kbps; };
 523         const float getMaxDownloadRateKB()
 524                 { MutexAutoLock lock(m_internal_mutex); return max_kbps; };
 525
 526         const float getCurrentLossRateKB()
 527                 { MutexAutoLock lock(m_internal_mutex); return cur_kbps_lost; };
 528         const float getMaxLossRateKB()
 529                 { MutexAutoLock lock(m_internal_mutex); return max_kbps_lost; };
 530
 531         const float getCurrentIncomingRateKB()
 532                 { MutexAutoLock lock(m_internal_mutex); return cur_incoming_kbps; };
 533         const float getMaxIncomingRateKB()
 534                 { MutexAutoLock lock(m_internal_mutex); return max_incoming_kbps; };
 535
 536         const float getAvgDownloadRateKB()
 537                 { MutexAutoLock lock(m_internal_mutex); return avg_kbps; };
 538         const float getAvgLossRateKB()
 539                 { MutexAutoLock lock(m_internal_mutex); return avg_kbps_lost; };
 540         const float getAvgIncomingRateKB()
 541                 { MutexAutoLock lock(m_internal_mutex); return avg_incoming_kbps; };
 542
 543         const unsigned int getWindowSize() const { return window_size; };
 544
 545         void setWindowSize(unsigned int size) { window_size = size; };
 546 private:
 547         Mutex m_internal_mutex;
 548         int window_size;
 549
 550         u16 next_incoming_seqnum;
 551
 552         u16 next_outgoing_seqnum;
 553         u16 next_outgoing_split_seqnum;
 554
 555         unsigned int current_packet_loss;
 556         unsigned int current_packet_too_late;
 557         unsigned int current_packet_successfull;
 558         float packet_loss_counter;
 559
 560         unsigned int current_bytes_transfered;
 561         unsigned int current_bytes_received;
 562         unsigned int current_bytes_lost;
 563         float max_kbps;
 564         float cur_kbps;
 565         float avg_kbps;
 566         float max_incoming_kbps;
 567         float cur_incoming_kbps;
 568         float avg_incoming_kbps;
 569         float max_kbps_lost;
 570         float cur_kbps_lost;
 571         float avg_kbps_lost;
 572         float bpm_counter;
 573
 574         unsigned int rate_samples;
 575 };
 576
 577 class Peer;
 578
 579 enum PeerChangeType
 580 {
 581         PEER_ADDED,
 582         PEER_REMOVED
 583 };
 584 struct PeerChange
 585 {
 586         PeerChangeType type;
 587         u16 peer_id;
 588         bool timeout;
 589 };
 590
 591 class PeerHandler
 592 {
 593 public:
 594
 595         PeerHandler()
 596         {
 597         }
 598         virtual ~PeerHandler()
 599         {
 600         }
 601
 602         /*
 603                 This is called after the Peer has been inserted into the
 604                 Connection's peer container.
 605         */
 606         virtual void peerAdded(Peer *peer) = 0;
 607         /*
 608                 This is called before the Peer has been removed from the
 609                 Connection's peer container.
 610         */
 611         virtual void deletingPeer(Peer *peer, bool timeout) = 0;
 612 };
 613
 614 class PeerHelper
 615 {
 616 public:
 617         PeerHelper();
 618         PeerHelper(Peer* peer);
 619         ~PeerHelper();
 620
 621         PeerHelper&   operator=(Peer* peer);
 622         Peer*         operator->() const;
 623         bool          operator!();
 624         Peer*         operator&() const;
 625         bool          operator!=(void* ptr);
 626
 627 private:
 628         Peer* m_peer;
 629 };
 630
 631 class Connection;
 632
 633 typedef enum {
 634         MIN_RTT,
 635         MAX_RTT,
 636         AVG_RTT,
 637         MIN_JITTER,
 638         MAX_JITTER,
 639         AVG_JITTER
 640 } rtt_stat_type;
 641
 642 typedef enum {
 643         CUR_DL_RATE,
 644         AVG_DL_RATE,
 645         CUR_INC_RATE,
 646         AVG_INC_RATE,
 647         CUR_LOSS_RATE,
 648         AVG_LOSS_RATE,
 649 } rate_stat_type;
 650
 651 class Peer {
 652         public:
 653                 friend class PeerHelper;
 654
 655                 Peer(Address address_,u16 id_,Connection* connection) :
 656                         id(id_),
 657                         m_increment_packets_remaining(9),
 658                         m_increment_bytes_remaining(0),
 659                         m_pending_deletion(false),
 660                         m_connection(connection),
 661                         address(address_),
 662                         m_ping_timer(0.0),
 663                         m_last_rtt(-1.0),
 664                         m_usage(0),
 665                         m_timeout_counter(0.0),
 666                         m_last_timeout_check(porting::getTimeMs())
 667                 {
 668                         m_rtt.avg_rtt = -1.0;
 669                         m_rtt.jitter_avg = -1.0;
 670                         m_rtt.jitter_max = 0.0;
 671                         m_rtt.max_rtt = 0.0;
 672                         m_rtt.jitter_min = FLT_MAX;
 673                         m_rtt.min_rtt = FLT_MAX;
 674                 };
 675
 676                 virtual ~Peer() {
 677                         MutexAutoLock usage_lock(m_exclusive_access_mutex);
 678                         FATAL_ERROR_IF(m_usage != 0, "Reference counting failure");
 679                 };
 680
 681                 // Unique id of the peer
 682                 u16 id;
 683
 684                 void Drop();
 685
 686                 virtual void PutReliableSendCommand(ConnectionCommand &c,
 687                                                 unsigned int max_packet_size) {};
 688
 689                 virtual bool getAddress(MTProtocols type, Address& toset) = 0;
 690
 691                 bool isPendingDeletion()
 692                 { MutexAutoLock lock(m_exclusive_access_mutex); return m_pending_deletion; };
 693
 694                 void ResetTimeout()
 695                         {MutexAutoLock lock(m_exclusive_access_mutex); m_timeout_counter=0.0; };
 696
 697                 bool isTimedOut(float timeout);
 698
 699                 unsigned int m_increment_packets_remaining;
 700                 unsigned int m_increment_bytes_remaining;
 701
 702                 virtual u16 getNextSplitSequenceNumber(u8 channel) { return 0; };
 703                 virtual void setNextSplitSequenceNumber(u8 channel, u16 seqnum) {};
 704                 virtual SharedBuffer<u8> addSpiltPacket(u8 channel,
 705                                                                                                 BufferedPacket toadd,
 706                                                                                                 bool reliable)
 707                                 {
 708                                         fprintf(stderr,"Peer: addSplitPacket called, this is supposed to be never called!\n");
 709                                         return SharedBuffer<u8>(0);
 710                                 };
 711
 712                 virtual bool Ping(float dtime, SharedBuffer<u8>& data) { return false; };
 713
 714                 virtual float getStat(rtt_stat_type type) const {
 715                         switch (type) {
 716                                 case MIN_RTT:
 717                                         return m_rtt.min_rtt;
 718                                 case MAX_RTT:
 719                                         return m_rtt.max_rtt;
 720                                 case AVG_RTT:
 721                                         return m_rtt.avg_rtt;
 722                                 case MIN_JITTER:
 723                                         return m_rtt.jitter_min;
 724                                 case MAX_JITTER:
 725                                         return m_rtt.jitter_max;
 726                                 case AVG_JITTER:
 727                                         return m_rtt.jitter_avg;
 728                         }
 729                         return -1;
 730                 }
 731         protected:
 732                 virtual void reportRTT(float rtt) {};
 733
 734                 void RTTStatistics(float rtt,
 735                                                         const std::string &profiler_id = "",
 736                                                         unsigned int num_samples = 1000);
 737
 738                 bool IncUseCount();
 739                 void DecUseCount();
 740
 741                 Mutex m_exclusive_access_mutex;
 742
 743                 bool m_pending_deletion;
 744
 745                 Connection* m_connection;
 746
 747                 // Address of the peer
 748                 Address address;
 749
 750                 // Ping timer
 751                 float m_ping_timer;
 752         private:
 753
 754                 struct rttstats {
 755                         float jitter_min;
 756                         float jitter_max;
 757                         float jitter_avg;
 758                         float min_rtt;
 759                         float max_rtt;
 760                         float avg_rtt;
 761                 };
 762
 763                 rttstats m_rtt;
 764                 float    m_last_rtt;
 765
 766                 // current usage count
 767                 unsigned int m_usage;
 768
 769                 // Seconds from last receive
 770                 float m_timeout_counter;
 771
 772                 u32 m_last_timeout_check;
 773 };
 774
 775 class UDPPeer : public Peer
 776 {
 777 public:
 778
 779         friend class PeerHelper;
 780         friend class ConnectionReceiveThread;
 781         friend class ConnectionSendThread;
 782         friend class Connection;
 783
 784         UDPPeer(u16 a_id, Address a_address, Connection* connection);
 785         virtual ~UDPPeer() {};
 786
 787         void PutReliableSendCommand(ConnectionCommand &c,
 788                                                         unsigned int max_packet_size);
 789
 790         bool getAddress(MTProtocols type, Address& toset);
 791
 792         void setNonLegacyPeer();
 793
 794         bool getLegacyPeer()
 795         { return m_legacy_peer; }
 796
 797         u16 getNextSplitSequenceNumber(u8 channel);
 798         void setNextSplitSequenceNumber(u8 channel, u16 seqnum);
 799
 800         SharedBuffer<u8> addSpiltPacket(u8 channel,
 801                                                                         BufferedPacket toadd,
 802                                                                         bool reliable);
 803
 804
 805 protected:
 806         /*
 807                 Calculates avg_rtt and resend_timeout.
 808                 rtt=-1 only recalculates resend_timeout
 809         */
 810         void reportRTT(float rtt);
 811
 812         void RunCommandQueues(
 813                                         unsigned int max_packet_size,
 814                                         unsigned int maxcommands,
 815                                         unsigned int maxtransfer);
 816
 817         float getResendTimeout()
 818                 { MutexAutoLock lock(m_exclusive_access_mutex); return resend_timeout; }
 819
 820         void setResendTimeout(float timeout)
 821                 { MutexAutoLock lock(m_exclusive_access_mutex); resend_timeout = timeout; }
 822         bool Ping(float dtime,SharedBuffer<u8>& data);
 823
 824         Channel channels[CHANNEL_COUNT];
 825         bool m_pending_disconnect;
 826 private:
 827         // This is changed dynamically
 828         float resend_timeout;
 829
 830         bool processReliableSendCommand(
 831                                         ConnectionCommand &c,
 832                                         unsigned int max_packet_size);
 833
 834         bool m_legacy_peer;
 835 };
 836
 837 /*
 838         Connection
 839 */
 840
 841 enum ConnectionEventType{
 842         CONNEVENT_NONE,
 843         CONNEVENT_DATA_RECEIVED,
 844         CONNEVENT_PEER_ADDED,
 845         CONNEVENT_PEER_REMOVED,
 846         CONNEVENT_BIND_FAILED,
 847 };
 848
 849 struct ConnectionEvent
 850 {
 851         enum ConnectionEventType type;
 852         u16 peer_id;
 853         Buffer<u8> data;
 854         bool timeout;
 855         Address address;
 856
 857         ConnectionEvent(): type(CONNEVENT_NONE), peer_id(0),
 858                         timeout(false) {}
 859
 860         std::string describe()
 861         {
 862                 switch(type) {
 863                 case CONNEVENT_NONE:
 864                         return "CONNEVENT_NONE";
 865                 case CONNEVENT_DATA_RECEIVED:
 866                         return "CONNEVENT_DATA_RECEIVED";
 867                 case CONNEVENT_PEER_ADDED:
 868                         return "CONNEVENT_PEER_ADDED";
 869                 case CONNEVENT_PEER_REMOVED:
 870                         return "CONNEVENT_PEER_REMOVED";
 871                 case CONNEVENT_BIND_FAILED:
 872                         return "CONNEVENT_BIND_FAILED";
 873                 }
 874                 return "Invalid ConnectionEvent";
 875         }
 876
 877         void dataReceived(u16 peer_id_, const SharedBuffer<u8> &data_)
 878         {
 879                 type = CONNEVENT_DATA_RECEIVED;
 880                 peer_id = peer_id_;
 881                 data = data_;
 882         }
 883         void peerAdded(u16 peer_id_, Address address_)
 884         {
 885                 type = CONNEVENT_PEER_ADDED;
 886                 peer_id = peer_id_;
 887                 address = address_;
 888         }
 889         void peerRemoved(u16 peer_id_, bool timeout_, Address address_)
 890         {
 891                 type = CONNEVENT_PEER_REMOVED;
 892                 peer_id = peer_id_;
 893                 timeout = timeout_;
 894                 address = address_;
 895         }
 896         void bindFailed()
 897         {
 898                 type = CONNEVENT_BIND_FAILED;
 899         }
 900 };
 901
 902 class ConnectionSendThread : public Thread {
 903
 904 public:
 905         friend class UDPPeer;
 906
 907         ConnectionSendThread(unsigned int max_packet_size, float timeout);
 908
 909         void *run();
 910
 911         void Trigger();
 912
 913         void setParent(Connection* parent) {
 914                 assert(parent != NULL); // Pre-condition
 915                 m_connection = parent;
 916         }
 917
 918         void setPeerTimeout(float peer_timeout)
 919                 { m_timeout = peer_timeout; }
 920
 921 private:
 922         void runTimeouts    (float dtime);
 923         void rawSend        (const BufferedPacket &packet);
 924         bool rawSendAsPacket(u16 peer_id, u8 channelnum,
 925                                                         SharedBuffer<u8> data, bool reliable);
 926
 927         void processReliableCommand (ConnectionCommand &c);
 928         void processNonReliableCommand (ConnectionCommand &c);
 929         void serve          (Address bind_address);
 930         void connect        (Address address);
 931         void disconnect     ();
 932         void disconnect_peer(u16 peer_id);
 933         void send           (u16 peer_id, u8 channelnum,
 934                                                         SharedBuffer<u8> data);
 935         void sendReliable   (ConnectionCommand &c);
 936         void sendToAll      (u8 channelnum,
 937                                                         SharedBuffer<u8> data);
 938         void sendToAllReliable(ConnectionCommand &c);
 939
 940         void sendPackets    (float dtime);
 941
 942         void sendAsPacket   (u16 peer_id, u8 channelnum,
 943                                                         SharedBuffer<u8> data,bool ack=false);
 944
 945         void sendAsPacketReliable(BufferedPacket& p, Channel* channel);
 946
 947         bool packetsQueued();
 948
 949         Connection*           m_connection;
 950         unsigned int          m_max_packet_size;
 951         float                 m_timeout;
 952         std::queue<OutgoingPacket> m_outgoing_queue;
 953         Semaphore             m_send_sleep_semaphore;
 954
 955         unsigned int          m_iteration_packets_avaialble;
 956         unsigned int          m_max_commands_per_iteration;
 957         unsigned int          m_max_data_packets_per_iteration;
 958         unsigned int          m_max_packets_requeued;
 959 };
 960
 961 class ConnectionReceiveThread : public Thread {
 962 public:
 963         ConnectionReceiveThread(unsigned int max_packet_size);
 964
 965         void *run();
 966
 967         void setParent(Connection *parent) {
 968                 assert(parent); // Pre-condition
 969                 m_connection = parent;
 970         }
 971
 972 private:
 973         void receive();
 974
 975         // Returns next data from a buffer if possible
 976         // If found, returns true; if not, false.
 977         // If found, sets peer_id and dst
 978         bool getFromBuffers(u16 &peer_id, SharedBuffer<u8> &dst);
 979
 980         bool checkIncomingBuffers(Channel *channel, u16 &peer_id,
 981                                                         SharedBuffer<u8> &dst);
 982
 983         /*
 984                 Processes a packet with the basic header stripped out.
 985                 Parameters:
 986                         packetdata: Data in packet (with no base headers)
 987                         peer_id: peer id of the sender of the packet in question
 988                         channelnum: channel on which the packet was sent
 989                         reliable: true if recursing into a reliable packet
 990         */
 991         SharedBuffer<u8> processPacket(Channel *channel,
 992                                                         SharedBuffer<u8> packetdata, u16 peer_id,
 993                                                         u8 channelnum, bool reliable);
 994
 995
 996         Connection*           m_connection;
 997 };
 998
 999 class Connection
1000 {
1001 public:
1002         friend class ConnectionSendThread;
1003         friend class ConnectionReceiveThread;
1004
1005         Connection(u32 protocol_id, u32 max_packet_size, float timeout, bool ipv6,
1006                         PeerHandler *peerhandler);
1007         ~Connection();
1008
1009         /* Interface */
1010         ConnectionEvent waitEvent(u32 timeout_ms);
1011         void putCommand(ConnectionCommand &c);
1012
1013         void SetTimeoutMs(int timeout) { m_bc_receive_timeout = timeout; }
1014         void Serve(Address bind_addr);
1015         void Connect(Address address);
1016         bool Connected();
1017         void Disconnect();
1018         void Receive(NetworkPacket* pkt);
1019         void Send(u16 peer_id, u8 channelnum, NetworkPacket* pkt, bool reliable);
1020         u16 GetPeerID() { return m_peer_id; }
1021         Address GetPeerAddress(u16 peer_id);
1022         float getPeerStat(u16 peer_id, rtt_stat_type type);
1023         float getLocalStat(rate_stat_type type);
1024         const u32 GetProtocolID() const { return m_protocol_id; };
1025         const std::string getDesc();
1026         void DisconnectPeer(u16 peer_id);
1027
1028 protected:
1029         PeerHelper getPeer(u16 peer_id);
1030         PeerHelper getPeerNoEx(u16 peer_id);
1031         u16   lookupPeer(Address& sender);
1032
1033         u16 createPeer(Address& sender, MTProtocols protocol, int fd);
1034         UDPPeer*  createServerPeer(Address& sender);
1035         bool deletePeer(u16 peer_id, bool timeout);
1036
1037         void SetPeerID(u16 id) { m_peer_id = id; }
1038
1039         void sendAck(u16 peer_id, u8 channelnum, u16 seqnum);
1040
1041         void PrintInfo(std::ostream &out);
1042         void PrintInfo();
1043
1044         std::list<u16> getPeerIDs()
1045         {
1046                 MutexAutoLock peerlock(m_peers_mutex);
1047                 return m_peer_ids;
1048         }
1049
1050         UDPSocket m_udpSocket;
1051         MutexedQueue<ConnectionCommand> m_command_queue;
1052
1053         void putEvent(ConnectionEvent &e);
1054
1055         void TriggerSend()
1056                 { m_sendThread.Trigger(); }
1057 private:
1058         std::list<Peer*> getPeers();
1059
1060         MutexedQueue<ConnectionEvent> m_event_queue;
1061
1062         u16 m_peer_id;
1063         u32 m_protocol_id;
1064
1065         std::map<u16, Peer*> m_peers;
1066         std::list<u16> m_peer_ids;
1067         Mutex m_peers_mutex;
1068
1069         ConnectionSendThread m_sendThread;
1070         ConnectionReceiveThread m_receiveThread;
1071
1072         Mutex m_info_mutex;
1073
1074         // Backwards compatibility
1075         PeerHandler *m_bc_peerhandler;
1076         int m_bc_receive_timeout;
1077
1078         bool m_shutting_down;
1079
1080         u16 m_next_remote_peer_id;
1081 };
1082
1083 } // namespace
1084
1085 #endif