2 #include "ClientConnection.hpp"
3 #include "Connection.hpp"
4 #include "ConnectionHandler.hpp"
9 #include "../app/init.hpp"
10 #include "../model/CompositeModel.hpp"
11 #include "../world/World.hpp"
15 #include <glm/gtx/io.hpp>
22 constexpr size_t Packet::Ping::MAX_LEN;
23 constexpr size_t Packet::Login::MAX_LEN;
24 constexpr size_t Packet::Join::MAX_LEN;
25 constexpr size_t Packet::Part::MAX_LEN;
26 constexpr size_t Packet::PlayerUpdate::MAX_LEN;
27 constexpr size_t Packet::SpawnEntity::MAX_LEN;
28 constexpr size_t Packet::DespawnEntity::MAX_LEN;
29 constexpr size_t Packet::EntityUpdate::MAX_LEN;
33 UDPsocket client_bind(Uint16 port) {
34 UDPsocket sock = SDLNet_UDP_Open(port);
36 throw NetError("SDLNet_UDP_Open");
41 IPaddress client_resolve(const char *host, Uint16 port) {
43 if (SDLNet_ResolveHost(&addr, host, port) != 0) {
44 throw NetError("SDLNet_ResolveHost");
51 Client::Client(const Config &conf)
52 : conn(client_resolve(conf.host.c_str(), conf.port))
53 , client_sock(client_bind(0))
54 , client_pack{ -1, nullptr, 0 }
56 client_pack.data = new Uint8[sizeof(Packet)];
57 client_pack.maxlen = sizeof(Packet);
58 // establish connection
64 delete[] client_pack.data;
65 SDLNet_UDP_Close(client_sock);
69 void Client::Handle() {
70 int result = SDLNet_UDP_Recv(client_sock, &client_pack);
72 HandlePacket(client_pack);
73 result = SDLNet_UDP_Recv(client_sock, &client_pack);
77 throw NetError("SDLNet_UDP_Recv");
81 void Client::HandlePacket(const UDPpacket &udp_pack) {
82 if (!conn.Matches(udp_pack.address)) {
83 // packet came from somewhere else, drop
86 const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
87 if (pack.header.tag != Packet::TAG) {
88 // mistagged packet, drop
92 conn.Received(udp_pack);
95 void Client::Update(int dt) {
96 update_timer.Update(dt);
98 if (conn.ShouldPing()) {
103 uint16_t Client::SendPing() {
104 return conn.SendPing(client_pack, client_sock);
107 uint16_t Client::SendLogin(const string &name) {
108 auto pack = Packet::Make<Packet::Login>(client_pack);
109 pack.WritePlayerName(name);
110 return conn.Send(client_pack, client_sock);
113 int Client::SendPlayerUpdate(const Entity &player) {
114 // don't send all too many updates
115 if (!update_timer.Hit()) return -1;
116 auto pack = Packet::Make<Packet::PlayerUpdate>(client_pack);
117 pack.WritePlayer(player);
118 return conn.Send(client_pack, client_sock);
121 uint16_t Client::SendPart() {
122 Packet::Make<Packet::Part>(client_pack);
123 return conn.Send(client_pack, client_sock);
127 ClientConnection::ClientConnection(Server &server, const IPaddress &addr)
133 , player_update_pack(0)
134 , player_update_timer(1500) {
135 conn.SetHandler(this);
138 ClientConnection::~ClientConnection() {
142 void ClientConnection::Update(int dt) {
144 if (Disconnected()) {
149 auto global_iter = server.GetWorld().Entities().begin();
150 auto global_end = server.GetWorld().Entities().end();
151 auto local_iter = spawns.begin();
152 auto local_end = spawns.end();
154 while (global_iter != global_end && local_iter != local_end) {
155 if (global_iter->ID() == local_iter->entity->ID()) {
157 if (CanDespawn(*global_iter)) {
158 SendDespawn(*local_iter);
161 SendUpdate(*local_iter);
165 } else if (global_iter->ID() < local_iter->entity->ID()) {
166 // global entity was inserted
167 if (CanSpawn(*global_iter)) {
168 auto spawned = spawns.emplace(local_iter, *global_iter);
173 // global entity was removed
174 SendDespawn(*local_iter);
180 while (global_iter != global_end) {
181 if (CanSpawn(*global_iter)) {
182 spawns.emplace_back(*global_iter);
183 SendSpawn(spawns.back());
189 while (local_iter != local_end) {
190 SendDespawn(*local_iter);
194 if (conn.ShouldPing()) {
195 conn.SendPing(server.GetPacket(), server.GetSocket());
199 ClientConnection::SpawnStatus::SpawnStatus(Entity &e)
206 ClientConnection::SpawnStatus::~SpawnStatus() {
210 bool ClientConnection::CanSpawn(const Entity &e) const noexcept {
214 manhattan_radius(e.ChunkCoords() - Player().ChunkCoords()) < 7;
217 bool ClientConnection::CanDespawn(const Entity &e) const noexcept {
220 manhattan_radius(e.ChunkCoords() - Player().ChunkCoords()) > 7;
223 void ClientConnection::SendSpawn(SpawnStatus &status) {
224 // don't double spawn
225 if (status.spawn_pack != -1) return;
227 auto pack = Packet::Make<Packet::SpawnEntity>(server.GetPacket());
228 pack.WriteEntity(*status.entity);
229 status.spawn_pack = conn.Send(server.GetPacket(), server.GetSocket());
233 void ClientConnection::SendDespawn(SpawnStatus &status) {
234 // don't double despawn
235 if (status.despawn_pack != -1) return;
237 auto pack = Packet::Make<Packet::DespawnEntity>(server.GetPacket());
238 pack.WriteEntityID(status.entity->ID());
239 status.despawn_pack = conn.Send(server.GetPacket(), server.GetSocket());
243 void ClientConnection::SendUpdate(SpawnStatus &status) {
244 // don't send updates while spawn not ack'd or despawn sent
245 if (status.spawn_pack != -1 || status.despawn_pack != -1) return;
247 // TODO: pack entity updates
248 auto pack = Packet::Make<Packet::EntityUpdate>(server.GetPacket());
249 pack.WriteEntityCount(1);
250 pack.WriteEntity(*status.entity, 0);
251 server.GetPacket().len = Packet::EntityUpdate::GetSize(1);
252 conn.Send(server.GetPacket(), server.GetSocket());
255 void ClientConnection::AttachPlayer(Entity &new_player) {
257 player = &new_player;
259 cout << "player \"" << player->Name() << "\" joined" << endl;
262 void ClientConnection::DetachPlayer() {
266 cout << "player \"" << player->Name() << "\" left" << endl;
270 void ClientConnection::OnPacketReceived(uint16_t seq) {
271 if (!confirm_wait) return;
272 for (auto iter = spawns.begin(), end = spawns.end(); iter != end; ++iter) {
273 if (seq == iter->spawn_pack) {
274 iter->spawn_pack = -1;
278 if (seq == iter->despawn_pack) {
286 void ClientConnection::OnPacketLost(uint16_t seq) {
287 if (!confirm_wait) return;
288 for (SpawnStatus &status : spawns) {
289 if (seq == status.spawn_pack) {
290 status.spawn_pack = -1;
295 if (seq == status.despawn_pack) {
296 status.despawn_pack = -1;
304 void ClientConnection::On(const Packet::Login &pack) {
306 pack.ReadPlayerName(name);
308 Entity *new_player = server.GetWorld().AddPlayer(name).entity;
312 AttachPlayer(*new_player);
313 cout << "accepted login from player \"" << name << '"' << endl;
314 auto response = Packet::Make<Packet::Join>(server.GetPacket());
315 response.WritePlayer(*new_player);
316 response.WriteWorldName(server.GetWorld().Name());
317 conn.Send(server.GetPacket(), server.GetSocket());
318 // set up update tracking
319 player_update_pack = pack.Seq();
320 player_update_timer.Reset();
321 player_update_timer.Start();
324 cout << "rejected login from player \"" << name << '"' << endl;
325 Packet::Make<Packet::Part>(server.GetPacket());
326 conn.Send(server.GetPacket(), server.GetSocket());
331 void ClientConnection::On(const Packet::Part &) {
335 void ClientConnection::On(const Packet::PlayerUpdate &pack) {
336 if (!HasPlayer()) return;
337 int pack_diff = int16_t(pack.Seq()) - int16_t(player_update_pack);
338 bool overdue = player_update_timer.HitOnce();
339 player_update_timer.Reset();
340 if (pack_diff > 0 || overdue) {
341 player_update_pack = pack.Seq();
342 pack.ReadPlayer(Player());
347 Connection::Connection(const IPaddress &addr)
352 , ctrl_out{ 0, 0xFFFF, 0xFFFFFFFF }
353 , ctrl_in{ 0, 0xFFFF, 0xFFFFFFFF }
359 bool Connection::Matches(const IPaddress &remote) const noexcept {
360 return memcmp(&addr, &remote, sizeof(IPaddress)) == 0;
363 void Connection::FlagSend() noexcept {
367 void Connection::FlagRecv() noexcept {
371 bool Connection::ShouldPing() const noexcept {
372 return !closed && send_timer.HitOnce();
375 bool Connection::TimedOut() const noexcept {
376 return recv_timer.HitOnce();
379 void Connection::Update(int dt) {
380 send_timer.Update(dt);
381 recv_timer.Update(dt);
385 Handler().OnTimeout();
391 uint16_t Connection::Send(UDPpacket &udp_pack, UDPsocket sock) {
392 Packet &pack = *reinterpret_cast<Packet *>(udp_pack.data);
393 pack.header.ctrl = ctrl_out;
394 uint16_t seq = ctrl_out.seq++;
396 udp_pack.address = addr;
397 if (SDLNet_UDP_Send(sock, -1, &udp_pack) == 0) {
398 throw NetError("SDLNet_UDP_Send");
405 void Connection::Received(const UDPpacket &udp_pack) {
406 Packet &pack = *reinterpret_cast<Packet *>(udp_pack.data);
409 int16_t diff = int16_t(pack.header.ctrl.seq) - int16_t(ctrl_out.ack);
414 ctrl_out.hist <<= diff;
415 ctrl_out.hist |= 1 << (diff - 1);
417 } else if (diff < 0 && diff >= -32) {
418 ctrl_out.hist |= 1 << (-diff - 1);
420 ctrl_out.ack = pack.header.ctrl.seq;
427 Packet::TControl ctrl_new = pack.header.ctrl;
428 Handler().Handle(udp_pack);
431 // if the packet holds more recent information
432 // check if remote failed to ack one of our packets
433 diff = int16_t(ctrl_new.ack) - int16_t(ctrl_in.ack);
434 // should always be true, but you never know…
436 for (int i = 0; i < diff; ++i) {
437 if (i > 32 || (i < 32 && (ctrl_in.hist & (1 << (31 - i))) == 0)) {
438 Handler().OnPacketLost(ctrl_in.ack - 32 + i);
442 // check for newly ack'd packets
443 for (uint16_t s = ctrl_new.AckBegin(); s != ctrl_new.AckEnd(); ++s) {
444 if (ctrl_new.Acks(s) && !ctrl_in.Acks(s)) {
445 Handler().OnPacketReceived(s);
452 bool Packet::TControl::Acks(uint16_t s) const noexcept {
453 int16_t diff = int16_t(ack) - int16_t(s);
454 if (diff == 0) return true;
455 if (diff < 0 || diff > 32) return false;
456 return (hist & (1 << (diff - 1))) != 0;
459 uint16_t Connection::SendPing(UDPpacket &udp_pack, UDPsocket sock) {
460 Packet::Make<Packet::Ping>(udp_pack);
461 return Send(udp_pack, sock);
465 ostream &operator <<(ostream &out, const IPaddress &addr) {
466 const unsigned char *host = reinterpret_cast<const unsigned char *>(&addr.host);
468 << '.' << int(host[1])
469 << '.' << int(host[2])
470 << '.' << int(host[3]);
472 out << ':' << SDLNet_Read16(&addr.port);
478 const char *Packet::Type2String(uint8_t t) noexcept {
488 case PlayerUpdate::TYPE:
489 return "PlayerUpdate";
490 case SpawnEntity::TYPE:
491 return "SpawnEntity";
492 case DespawnEntity::TYPE:
493 return "DespawnEntity";
494 case EntityUpdate::TYPE:
495 return "EntityUpdate";
502 void Packet::Payload::Write(const T &src, size_t off) noexcept {
503 if ((length - off) < sizeof(T)) {
504 // dismiss out of bounds write
507 *reinterpret_cast<T *>(&data[off]) = src;
511 void Packet::Payload::Read(T &dst, size_t off) const noexcept {
512 if ((length - off) < sizeof(T)) {
513 // dismiss out of bounds read
516 dst = *reinterpret_cast<T *>(&data[off]);
519 void Packet::Payload::WriteString(const string &src, size_t off, size_t maxlen) noexcept {
520 uint8_t *dst = &data[off];
521 size_t len = min(maxlen, length - off);
522 if (src.size() < len) {
523 memset(dst, '\0', len);
524 memcpy(dst, src.c_str(), src.size());
526 memcpy(dst, src.c_str(), len);
530 void Packet::Payload::ReadString(string &dst, size_t off, size_t maxlen) const noexcept {
531 size_t len = min(maxlen, length - off);
534 for (size_t i = 0; i < len && data[off + i] != '\0'; ++i) {
535 dst.push_back(data[off + i]);
540 void Packet::Login::WritePlayerName(const string &name) noexcept {
541 WriteString(name, 0, 32);
544 void Packet::Login::ReadPlayerName(string &name) const noexcept {
545 ReadString(name, 0, 32);
548 void Packet::Join::WritePlayer(const Entity &player) noexcept {
549 Write(player.ID(), 0);
550 Write(player.ChunkCoords(), 4);
551 Write(player.Position(), 16);
552 Write(player.Velocity(), 28);
553 Write(player.Orientation(), 40);
554 Write(player.AngularVelocity(), 56);
557 void Packet::Join::ReadPlayerID(uint32_t &id) const noexcept {
561 void Packet::Join::ReadPlayer(Entity &player) const noexcept {
562 glm::ivec3 chunk_coords(0);
568 Read(chunk_coords, 4);
574 player.Position(chunk_coords, pos);
575 player.Velocity(vel);
576 player.Orientation(rot);
577 player.AngularVelocity(ang);
580 void Packet::Join::WriteWorldName(const string &name) noexcept {
581 WriteString(name, 68, 32);
584 void Packet::Join::ReadWorldName(string &name) const noexcept {
585 ReadString(name, 68, 32);
588 void Packet::PlayerUpdate::WritePlayer(const Entity &player) noexcept {
589 Write(player.ChunkCoords(), 0);
590 Write(player.Position(), 12);
591 Write(player.Velocity(), 24);
592 Write(player.Orientation(), 36);
593 Write(player.AngularVelocity(), 52);
596 void Packet::PlayerUpdate::ReadPlayer(Entity &player) const noexcept {
597 glm::ivec3 chunk_coords(0);
603 Read(chunk_coords, 0);
609 player.Position(chunk_coords, pos);
610 player.Velocity(vel);
611 player.Orientation(rot);
612 player.AngularVelocity(ang);
615 void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept {
618 Write(e.GetModel().GetModel().ID(), 4);
620 Write(uint32_t(0), 4);
622 Write(e.ChunkCoords(), 8);
623 Write(e.Position(), 20);
624 Write(e.Velocity(), 32);
625 Write(e.Orientation(), 44);
626 Write(e.AngularVelocity(), 60);
627 Write(e.Bounds(), 72);
629 if (e.WorldCollidable()) {
633 WriteString(e.Name(), 100, 32);
636 void Packet::SpawnEntity::ReadEntityID(uint32_t &id) const noexcept {
640 void Packet::SpawnEntity::ReadSkeletonID(uint32_t &id) const noexcept {
644 void Packet::SpawnEntity::ReadEntity(Entity &e) const noexcept {
645 glm::ivec3 chunk_coords(0);
654 Read(chunk_coords, 8);
661 ReadString(name, 100, 32);
663 e.Position(chunk_coords, pos);
666 e.AngularVelocity(ang);
668 e.WorldCollidable(flags & 1);
672 void Packet::DespawnEntity::WriteEntityID(uint32_t id) noexcept {
676 void Packet::DespawnEntity::ReadEntityID(uint32_t &id) const noexcept {
680 void Packet::EntityUpdate::WriteEntityCount(uint32_t count) noexcept {
684 void Packet::EntityUpdate::ReadEntityCount(uint32_t &count) const noexcept {
688 void Packet::EntityUpdate::WriteEntity(const Entity &entity, uint32_t num) noexcept {
689 uint32_t off = 4 + (num * 64);
691 Write(entity.ID(), off);
692 Write(entity.ChunkCoords(), off + 4);
693 Write(entity.Position(), off + 16);
694 Write(entity.Velocity(), off + 28);
695 Write(entity.Orientation(), off + 40);
696 Write(entity.AngularVelocity(), off + 56);
699 void Packet::EntityUpdate::ReadEntityID(uint32_t &id, uint32_t num) const noexcept {
700 Read(id, 4 + (num * 64));
703 void Packet::EntityUpdate::ReadEntity(Entity &entity, uint32_t num) const noexcept {
704 uint32_t off = 4 + (num * 64);
706 glm::ivec3 chunk_coords(0);
712 Read(chunk_coords, off + 4);
718 entity.Position(chunk_coords, pos);
719 entity.Velocity(vel);
720 entity.Orientation(rot);
721 entity.AngularVelocity(ang);
725 void ConnectionHandler::Handle(const UDPpacket &udp_pack) {
726 const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
727 switch (pack.Type()) {
728 case Packet::Ping::TYPE:
729 On(Packet::As<Packet::Ping>(udp_pack));
731 case Packet::Login::TYPE:
732 On(Packet::As<Packet::Login>(udp_pack));
734 case Packet::Join::TYPE:
735 On(Packet::As<Packet::Join>(udp_pack));
737 case Packet::Part::TYPE:
738 On(Packet::As<Packet::Part>(udp_pack));
740 case Packet::PlayerUpdate::TYPE:
741 On(Packet::As<Packet::PlayerUpdate>(udp_pack));
743 case Packet::SpawnEntity::TYPE:
744 On(Packet::As<Packet::SpawnEntity>(udp_pack));
746 case Packet::DespawnEntity::TYPE:
747 On(Packet::As<Packet::DespawnEntity>(udp_pack));
749 case Packet::EntityUpdate::TYPE:
750 On(Packet::As<Packet::EntityUpdate>(udp_pack));
753 // drop unknown or unhandled packets
759 Server::Server(const Config &conf, World &world)
761 , serv_pack{ -1, nullptr, 0 }
764 serv_sock = SDLNet_UDP_Open(conf.port);
766 throw NetError("SDLNet_UDP_Open");
769 serv_pack.data = new Uint8[sizeof(Packet)];
770 serv_pack.maxlen = sizeof(Packet);
774 delete[] serv_pack.data;
775 SDLNet_UDP_Close(serv_sock);
779 void Server::Handle() {
780 int result = SDLNet_UDP_Recv(serv_sock, &serv_pack);
782 HandlePacket(serv_pack);
783 result = SDLNet_UDP_Recv(serv_sock, &serv_pack);
786 // a boo boo happened
787 throw NetError("SDLNet_UDP_Recv");
791 void Server::HandlePacket(const UDPpacket &udp_pack) {
792 if (udp_pack.len < int(sizeof(Packet::Header))) {
793 // packet too small, drop
796 const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
797 if (pack.header.tag != Packet::TAG) {
798 // mistagged packet, drop
802 ClientConnection &client = GetClient(udp_pack.address);
803 client.GetConnection().Received(udp_pack);
806 ClientConnection &Server::GetClient(const IPaddress &addr) {
807 for (ClientConnection &client : clients) {
808 if (client.Matches(addr)) {
812 clients.emplace_back(*this, addr);
813 return clients.back();
816 void Server::Update(int dt) {
817 for (list<ClientConnection>::iterator client(clients.begin()), end(clients.end()); client != end;) {
819 if (client->Disconnected()) {
820 client = clients.erase(client);