2 (c) 2010 Perttu Ahola <celeron55@gmail.com>
8 #include "clientserver.h"
10 #include "jmutexautolock.h"
12 #include "constants.h"
14 void * ServerThread::Thread()
18 DSTACK(__FUNCTION_NAME);
23 m_server->AsyncRunStep();
25 //dout_server<<"Running m_server->Receive()"<<std::endl;
28 catch(con::NoIncomingDataException &e)
31 #if CATCH_UNHANDLED_EXCEPTIONS
33 This is what has to be done in threads to get suitable debug info
35 catch(std::exception &e)
37 dstream<<std::endl<<DTIME<<"An unhandled exception occurred: "
38 <<e.what()<<std::endl;
48 void * EmergeThread::Thread()
52 DSTACK(__FUNCTION_NAME);
55 #if CATCH_UNHANDLED_EXCEPTIONS
61 Get block info from queue, emerge them and send them
64 After queue is empty, exit.
68 QueuedBlockEmerge *qptr = m_server->m_emerge_queue.pop();
72 SharedPtr<QueuedBlockEmerge> q(qptr);
76 //derr_server<<"EmergeThread::Thread(): running"<<std::endl;
79 Try to emerge it from somewhere.
81 If it is only wanted as optional, only loading from disk
86 Check if any peer wants it as non-optional. In that case it
89 Also decrement the emerge queue count in clients.
95 core::map<u16, u8>::Iterator i;
96 for(i=q->peer_ids.getIterator(); i.atEnd()==false; i++)
98 //u16 peer_id = i.getNode()->getKey();
101 u8 flags = i.getNode()->getValue();
102 if((flags & TOSERVER_GETBLOCK_FLAG_OPTIONAL) == false)
108 /*dstream<<"EmergeThread: p="
109 <<"("<<p.X<<","<<p.Y<<","<<p.Z<<") "
110 <<"optional="<<optional<<std::endl;*/
112 ServerMap &map = ((ServerMap&)m_server->m_env.getMap());
114 core::map<v3s16, MapBlock*> changed_blocks;
115 core::map<v3s16, MapBlock*> lighting_invalidated_blocks;
117 MapBlock *block = NULL;
118 bool got_block = true;
119 core::map<v3s16, MapBlock*> modified_blocks;
123 JMutexAutoLock envlock(m_server->m_env_mutex);
125 //TimeTaker timer("block emerge envlock", g_device);
128 bool only_from_disk = false;
131 only_from_disk = true;
133 block = map.emergeBlock(
137 lighting_invalidated_blocks);
139 // If it is a dummy, block was not found on disk
142 //dstream<<"EmergeThread: Got a dummy block"<<std::endl;
146 catch(InvalidPositionException &e)
149 // This happens when position is over limit.
155 if(debug && changed_blocks.size() > 0)
157 dout_server<<DTIME<<"Got changed_blocks: ";
158 for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
159 i.atEnd() == false; i++)
161 MapBlock *block = i.getNode()->getValue();
162 v3s16 p = block->getPos();
163 dout_server<<"("<<p.X<<","<<p.Y<<","<<p.Z<<") ";
165 dout_server<<std::endl;
169 Collect a list of blocks that have been modified in
170 addition to the fetched one.
173 // Add all the "changed blocks"
174 for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
175 i.atEnd() == false; i++)
177 MapBlock *block = i.getNode()->getValue();
178 modified_blocks.insert(block->getPos(), block);
181 /*dstream<<"lighting "<<lighting_invalidated_blocks.size()
182 <<" blocks"<<std::endl;
183 TimeTaker timer("** updateLighting", g_device);*/
185 // Update lighting without locking the environment mutex,
186 // add modified blocks to changed blocks
187 map.updateLighting(lighting_invalidated_blocks, modified_blocks);
189 // If we got no block, there should be no invalidated blocks
192 assert(lighting_invalidated_blocks.size() == 0);
198 Set sent status of modified blocks on clients
201 // NOTE: Server's clients are also behind the connection mutex
202 JMutexAutoLock lock(m_server->m_con_mutex);
205 Add the originally fetched block to the modified list
209 modified_blocks.insert(p, block);
213 Set the modified blocks unsent for all the clients
216 for(core::map<u16, RemoteClient*>::Iterator
217 i = m_server->m_clients.getIterator();
218 i.atEnd() == false; i++)
220 RemoteClient *client = i.getNode()->getValue();
222 if(modified_blocks.size() > 0)
224 // Remove block from sent history
225 client->SetBlocksNotSent(modified_blocks);
228 /*if(q->peer_ids.find(client->peer_id) != NULL)
230 // Decrement emerge queue count of client
231 client->BlockEmerged();
236 #if CATCH_UNHANDLED_EXCEPTIONS
239 This is what has to be done in threads to get suitable debug info
241 catch(std::exception &e)
243 dstream<<std::endl<<DTIME<<"An unhandled exception occurred: "
244 <<e.what()<<std::endl;
252 void RemoteClient::GetNextBlocks(Server *server, float dtime,
253 core::array<PrioritySortedBlockTransfer> &dest)
255 DSTACK(__FUNCTION_NAME);
257 // Won't send anything if already sending
259 JMutexAutoLock lock(m_blocks_sending_mutex);
261 if(m_blocks_sending.size() >= g_settings.getU16
262 ("max_simultaneous_block_sends_per_client"))
264 //dstream<<"Not sending any blocks, Queue full."<<std::endl;
269 Player *player = server->m_env.getPlayer(peer_id);
271 v3f playerpos = player->getPosition();
272 v3f playerspeed = player->getSpeed();
274 v3s16 center_nodepos = floatToInt(playerpos);
276 v3s16 center = getNodeBlockPos(center_nodepos);
279 Get the starting value of the block finder radius.
281 s16 last_nearest_unsent_d;
284 JMutexAutoLock lock(m_blocks_sent_mutex);
286 if(m_last_center != center)
288 m_nearest_unsent_d = 0;
289 m_last_center = center;
292 static float reset_counter = 0;
293 reset_counter += dtime;
294 if(reset_counter > 5.0)
297 m_nearest_unsent_d = 0;
300 last_nearest_unsent_d = m_nearest_unsent_d;
302 d_start = m_nearest_unsent_d;
305 u16 maximum_simultaneous_block_sends = g_settings.getU16
306 ("max_simultaneous_block_sends_per_client");
309 Check the time from last addNode/removeNode.
311 Decrease send rate if player is building stuff.
314 SharedPtr<JMutexAutoLock> lock(m_time_from_building.getLock());
315 m_time_from_building.m_value += dtime;
316 if(m_time_from_building.m_value
317 < FULL_BLOCK_SEND_ENABLE_MIN_TIME_FROM_BUILDING)
319 maximum_simultaneous_block_sends
320 = LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
324 // Serialization version used
325 //u8 ser_version = serialization_version;
327 //bool has_incomplete_blocks = false;
330 TODO: Get this from somewhere
335 //TODO: Get this from somewhere (probably a bigger value)
338 //dstream<<"Starting from "<<d_start<<std::endl;
340 for(s16 d = d_start; d <= d_max; d++)
342 //dstream<<"RemoteClient::SendBlocks(): d="<<d<<std::endl;
344 //if(has_incomplete_blocks == false)
346 JMutexAutoLock lock(m_blocks_sent_mutex);
348 If m_nearest_unsent_d was changed by the EmergeThread
349 (it can change it to 0 through SetBlockNotSent),
351 Else update m_nearest_unsent_d
353 if(m_nearest_unsent_d != last_nearest_unsent_d)
355 d = m_nearest_unsent_d;
359 m_nearest_unsent_d = d;
361 last_nearest_unsent_d = m_nearest_unsent_d;
365 Get the border/face dot coordinates of a "d-radiused"
368 core::list<v3s16> list;
369 getFacePositions(list, d);
371 core::list<v3s16>::Iterator li;
372 for(li=list.begin(); li!=list.end(); li++)
374 v3s16 p = *li + center;
378 - Don't allow too many simultaneous transfers
379 - EXCEPT when the blocks are very close
381 Also, don't send blocks that are already flying.
383 if(d >= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
385 JMutexAutoLock lock(m_blocks_sending_mutex);
387 // Limit is dynamically lowered when building
388 if(m_blocks_sending.size()
389 >= maximum_simultaneous_block_sends)
391 /*dstream<<"Not sending more blocks. Queue full. "
392 <<m_blocks_sending.size()
397 if(m_blocks_sending.find(p) != NULL)
404 if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
405 || p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
406 || p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
407 || p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
408 || p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
409 || p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
412 bool generate = d <= d_max_gen;
414 // Limit the generating area vertically to half
415 if(abs(p.Y - center.Y) > d_max_gen / 2)
419 Don't send already sent blocks
422 JMutexAutoLock lock(m_blocks_sent_mutex);
424 if(m_blocks_sent.find(p) != NULL)
429 Check if map has this block
431 MapBlock *block = NULL;
434 block = server->m_env.getMap().getBlockNoCreate(p);
436 catch(InvalidPositionException &e)
440 bool surely_not_found_on_disk = false;
443 /*if(block->isIncomplete())
445 has_incomplete_blocks = true;
451 surely_not_found_on_disk = true;
456 If block has been marked to not exist on disk (dummy)
457 and generating new ones is not wanted, skip block.
459 if(generate == false && surely_not_found_on_disk == true)
466 Add inexistent block to emerge queue.
468 if(block == NULL || surely_not_found_on_disk)
470 /*SharedPtr<JMutexAutoLock> lock
471 (m_num_blocks_in_emerge_queue.getLock());*/
473 //TODO: Get value from somewhere
474 // Allow only one block in emerge queue
475 if(server->m_emerge_queue.peerItemCount(peer_id) < 1)
477 // Add it to the emerge queue and trigger the thread
480 if(generate == false)
481 flags |= TOSERVER_GETBLOCK_FLAG_OPTIONAL;
483 server->m_emerge_queue.addBlock(peer_id, p, flags);
484 server->m_emergethread.trigger();
495 PrioritySortedBlockTransfer q((float)d, p, peer_id);
501 // Don't add anything here. The loop breaks by returning.
504 void RemoteClient::SendObjectData(
507 core::map<v3s16, bool> &stepped_blocks
510 DSTACK(__FUNCTION_NAME);
512 // Can't send anything without knowing version
513 if(serialization_version == SER_FMT_VER_INVALID)
515 dstream<<"RemoteClient::SendObjectData(): Not sending, no version."
521 Send a TOCLIENT_OBJECTDATA packet.
525 u16 number of player positions
536 std::ostringstream os(std::ios_base::binary);
540 writeU16(buf, TOCLIENT_OBJECTDATA);
541 os.write((char*)buf, 2);
544 Get and write player data
547 core::list<Player*> players = server->m_env.getPlayers();
549 // Write player count
550 u16 playercount = players.size();
551 writeU16(buf, playercount);
552 os.write((char*)buf, 2);
554 core::list<Player*>::Iterator i;
555 for(i = players.begin();
556 i != players.end(); i++)
560 v3f pf = player->getPosition();
561 v3f sf = player->getSpeed();
563 v3s32 position_i(pf.X*100, pf.Y*100, pf.Z*100);
564 v3s32 speed_i (sf.X*100, sf.Y*100, sf.Z*100);
565 s32 pitch_i (player->getPitch() * 100);
566 s32 yaw_i (player->getYaw() * 100);
568 writeU16(buf, player->peer_id);
569 os.write((char*)buf, 2);
570 writeV3S32(buf, position_i);
571 os.write((char*)buf, 12);
572 writeV3S32(buf, speed_i);
573 os.write((char*)buf, 12);
574 writeS32(buf, pitch_i);
575 os.write((char*)buf, 4);
576 writeS32(buf, yaw_i);
577 os.write((char*)buf, 4);
581 Get and write object data
587 For making players to be able to build to their nearby
588 environment (building is not possible on blocks that are not
591 - Add blocks to emerge queue if they are not found
593 SUGGESTION: These could be ignored from the backside of the player
595 TODO: Keep track of total size of packet and stop when it is too big
598 Player *player = server->m_env.getPlayer(peer_id);
600 v3f playerpos = player->getPosition();
601 v3f playerspeed = player->getSpeed();
603 v3s16 center_nodepos = floatToInt(playerpos);
604 v3s16 center = getNodeBlockPos(center_nodepos);
606 //s16 d_max = ACTIVE_OBJECT_D_BLOCKS;
607 s16 d_max = g_settings.getS16("active_object_range");
609 // Number of blocks whose objects were written to bos
612 //core::map<v3s16, MapBlock*> blocks;
613 std::ostringstream bos(std::ios_base::binary);
615 for(s16 d = 0; d <= d_max; d++)
617 core::list<v3s16> list;
618 getFacePositions(list, d);
620 core::list<v3s16>::Iterator li;
621 for(li=list.begin(); li!=list.end(); li++)
623 v3s16 p = *li + center;
626 Ignore blocks that haven't been sent to the client
629 JMutexAutoLock sentlock(m_blocks_sent_mutex);
630 if(m_blocks_sent.find(p) == NULL)
634 // Try stepping block and add it to a send queue
639 MapBlock *block = server->m_env.getMap().getBlockNoCreate(p);
641 // Skip block if there are no objects
642 if(block->getObjectCount() == 0)
645 // Step block if not in stepped_blocks and add to stepped_blocks
646 if(stepped_blocks.find(p) == NULL)
648 block->stepObjects(dtime, true);
649 stepped_blocks.insert(p, true);
650 block->setChangedFlag();
659 bos.write((char*)buf, 6);
662 block->serializeObjects(bos, serialization_version);
667 Stop collecting objects if data is already too big
669 // Sum of player and object data sizes
670 s32 sum = (s32)os.tellp() + 2 + (s32)bos.tellp();
671 // break out if data too big
672 if(sum > MAX_OBJECTDATA_SIZE)
676 catch(InvalidPositionException &e)
679 // Add it to the emerge queue and trigger the thread.
680 // Fetch the block only if it is on disk.
682 // Grab and increment counter
683 /*SharedPtr<JMutexAutoLock> lock
684 (m_num_blocks_in_emerge_queue.getLock());
685 m_num_blocks_in_emerge_queue.m_value++;*/
687 // Add to queue as an anonymous fetch from disk
688 u8 flags = TOSERVER_GETBLOCK_FLAG_OPTIONAL;
689 server->m_emerge_queue.addBlock(0, p, flags);
690 server->m_emergethread.trigger();
701 writeU16(buf, blockcount);
702 os.write((char*)buf, 2);
704 for(core::map<v3s16, MapBlock*>::Iterator
705 i = blocks.getIterator();
706 i.atEnd() == false; i++)
708 v3s16 p = i.getNode()->getKey();
711 os.write((char*)buf, 6);
713 MapBlock *block = i.getNode()->getValue();
714 block->serializeObjects(os, serialization_version);
719 writeU16(buf, blockcount);
720 os.write((char*)buf, 2);
722 // Write block objects
729 //dstream<<"Server: Sending object data to "<<peer_id<<std::endl;
732 std::string s = os.str();
733 SharedBuffer<u8> data((u8*)s.c_str(), s.size());
734 // Send as unreliable
735 server->m_con.Send(peer_id, 0, data, false);
738 void RemoteClient::GotBlock(v3s16 p)
740 JMutexAutoLock lock(m_blocks_sending_mutex);
741 JMutexAutoLock lock2(m_blocks_sent_mutex);
742 if(m_blocks_sending.find(p) != NULL)
743 m_blocks_sending.remove(p);
745 dstream<<"RemoteClient::GotBlock(): Didn't find in"
746 " m_blocks_sending"<<std::endl;
747 m_blocks_sent.insert(p, true);
750 void RemoteClient::SentBlock(v3s16 p)
752 JMutexAutoLock lock(m_blocks_sending_mutex);
753 if(m_blocks_sending.size() > 15)
755 dstream<<"RemoteClient::SentBlock(): "
756 <<"m_blocks_sending.size()="
757 <<m_blocks_sending.size()<<std::endl;
759 if(m_blocks_sending.find(p) == NULL)
760 m_blocks_sending.insert(p, 0.0);
762 dstream<<"RemoteClient::SentBlock(): Sent block"
763 " already in m_blocks_sending"<<std::endl;
766 void RemoteClient::SetBlockNotSent(v3s16 p)
768 JMutexAutoLock sendinglock(m_blocks_sending_mutex);
769 JMutexAutoLock sentlock(m_blocks_sent_mutex);
771 m_nearest_unsent_d = 0;
773 if(m_blocks_sending.find(p) != NULL)
774 m_blocks_sending.remove(p);
775 if(m_blocks_sent.find(p) != NULL)
776 m_blocks_sent.remove(p);
779 void RemoteClient::SetBlocksNotSent(core::map<v3s16, MapBlock*> &blocks)
781 JMutexAutoLock sendinglock(m_blocks_sending_mutex);
782 JMutexAutoLock sentlock(m_blocks_sent_mutex);
784 m_nearest_unsent_d = 0;
786 for(core::map<v3s16, MapBlock*>::Iterator
787 i = blocks.getIterator();
788 i.atEnd()==false; i++)
790 v3s16 p = i.getNode()->getKey();
792 if(m_blocks_sending.find(p) != NULL)
793 m_blocks_sending.remove(p);
794 if(m_blocks_sent.find(p) != NULL)
795 m_blocks_sent.remove(p);
799 /*void RemoteClient::BlockEmerged()
801 SharedPtr<JMutexAutoLock> lock(m_num_blocks_in_emerge_queue.getLock());
802 assert(m_num_blocks_in_emerge_queue.m_value > 0);
803 m_num_blocks_in_emerge_queue.m_value--;
806 /*void RemoteClient::RunSendingTimeouts(float dtime, float timeout)
808 JMutexAutoLock sendinglock(m_blocks_sending_mutex);
810 core::list<v3s16> remove_queue;
811 for(core::map<v3s16, float>::Iterator
812 i = m_blocks_sending.getIterator();
813 i.atEnd()==false; i++)
815 v3s16 p = i.getNode()->getKey();
816 float t = i.getNode()->getValue();
818 i.getNode()->setValue(t);
822 remove_queue.push_back(p);
825 for(core::list<v3s16>::Iterator
826 i = remove_queue.begin();
827 i != remove_queue.end(); i++)
829 m_blocks_sending.remove(*i);
837 PlayerInfo::PlayerInfo()
842 void PlayerInfo::PrintLine(std::ostream *s)
844 (*s)<<id<<": \""<<name<<"\" ("
845 <<position.X<<","<<position.Y
846 <<","<<position.Z<<") ";
848 (*s)<<" avg_rtt="<<avg_rtt;
852 u32 PIChecksum(core::list<PlayerInfo> &l)
854 core::list<PlayerInfo>::Iterator i;
857 for(i=l.begin(); i!=l.end(); i++)
859 checksum += a * (i->id+1);
860 checksum ^= 0x435aafcd;
871 std::string mapsavedir,
875 m_env(new ServerMap(mapsavedir, hm_params, map_params), dout_server),
876 m_con(PROTOCOL_ID, 512, CONNECTION_TIMEOUT, this),
882 m_step_dtime_mutex.Init();
891 JMutexAutoLock clientslock(m_con_mutex);
893 for(core::map<u16, RemoteClient*>::Iterator
894 i = m_clients.getIterator();
895 i.atEnd() == false; i++)
897 u16 peer_id = i.getNode()->getKey();
901 JMutexAutoLock envlock(m_env_mutex);
902 m_env.removePlayer(peer_id);
906 delete i.getNode()->getValue();
910 void Server::start(unsigned short port)
912 DSTACK(__FUNCTION_NAME);
913 // Stop thread if already running
916 // Initialize connection
917 m_con.setTimeoutMs(30);
921 m_thread.setRun(true);
924 dout_server<<"Server started on port "<<port<<std::endl;
929 DSTACK(__FUNCTION_NAME);
930 // Stop threads (set run=false first so both start stopping)
931 m_thread.setRun(false);
932 m_emergethread.setRun(false);
934 m_emergethread.stop();
936 dout_server<<"Server threads stopped"<<std::endl;
939 void Server::step(float dtime)
941 DSTACK(__FUNCTION_NAME);
946 JMutexAutoLock lock(m_step_dtime_mutex);
947 m_step_dtime += dtime;
951 void Server::AsyncRunStep()
953 DSTACK(__FUNCTION_NAME);
957 JMutexAutoLock lock1(m_step_dtime_mutex);
958 dtime = m_step_dtime;
964 //dstream<<"Server steps "<<dtime<<std::endl;
966 //dstream<<"Server::AsyncRunStep(): dtime="<<dtime<<std::endl;
968 // Has to be locked for peerAdded/Removed
969 JMutexAutoLock lock1(m_env_mutex);
970 // Process connection's timeouts
971 JMutexAutoLock lock2(m_con_mutex);
972 m_con.RunTimeouts(dtime);
976 // This also runs Map's timers
977 JMutexAutoLock lock(m_env_mutex);
985 // Periodically print some info
987 static float counter = 0.0;
993 JMutexAutoLock lock2(m_con_mutex);
995 for(core::map<u16, RemoteClient*>::Iterator
996 i = m_clients.getIterator();
997 i.atEnd() == false; i++)
999 //u16 peer_id = i.getNode()->getKey();
1000 RemoteClient *client = i.getNode()->getValue();
1001 client->PrintInfo(std::cout);
1006 // Run time- and client- related stuff
1007 // NOTE: If you intend to add something here, check that it
1008 // doesn't fit in RemoteClient::GetNextBlocks for example.
1010 // Clients are behind connection lock
1011 JMutexAutoLock lock(m_con_mutex);
1013 for(core::map<u16, RemoteClient*>::Iterator
1014 i = m_clients.getIterator();
1015 i.atEnd() == false; i++)
1017 RemoteClient *client = i.getNode()->getValue();
1018 //con::Peer *peer = m_con.GetPeer(client->peer_id);
1019 //client->RunSendingTimeouts(dtime, peer->resend_timeout);
1023 // Send blocks to clients
1026 // Send object positions
1028 static float counter = 0.0;
1030 if(counter >= g_settings.getFloat("objectdata_interval"))
1032 JMutexAutoLock lock1(m_env_mutex);
1033 JMutexAutoLock lock2(m_con_mutex);
1034 SendObjectData(counter);
1040 // Trigger emergethread (it gets somehow gets to a
1041 // non-triggered but bysy state sometimes)
1043 static float counter = 0.0;
1049 m_emergethread.trigger();
1055 static float counter = 0.0;
1057 if(counter >= SERVER_MAP_SAVE_INTERVAL)
1061 JMutexAutoLock lock(m_env_mutex);
1062 // Save only changed parts
1063 m_env.getMap().save(true);
1068 void Server::Receive()
1070 DSTACK(__FUNCTION_NAME);
1071 u32 data_maxsize = 10000;
1072 Buffer<u8> data(data_maxsize);
1077 JMutexAutoLock lock(m_con_mutex);
1078 datasize = m_con.Receive(peer_id, *data, data_maxsize);
1080 ProcessData(*data, datasize, peer_id);
1082 catch(con::InvalidIncomingDataException &e)
1084 derr_server<<"Server::Receive(): "
1085 "InvalidIncomingDataException: what()="
1086 <<e.what()<<std::endl;
1088 catch(con::PeerNotFoundException &e)
1090 //NOTE: This is not needed anymore
1092 // The peer has been disconnected.
1093 // Find the associated player and remove it.
1095 /*JMutexAutoLock envlock(m_env_mutex);
1097 dout_server<<"ServerThread: peer_id="<<peer_id
1098 <<" has apparently closed connection. "
1099 <<"Removing player."<<std::endl;
1101 m_env.removePlayer(peer_id);*/
1105 void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
1107 DSTACK(__FUNCTION_NAME);
1108 // Environment is locked first.
1109 JMutexAutoLock envlock(m_env_mutex);
1110 JMutexAutoLock conlock(m_con_mutex);
1114 peer = m_con.GetPeer(peer_id);
1116 catch(con::PeerNotFoundException &e)
1118 derr_server<<DTIME<<"Server::ProcessData(): Cancelling: peer "
1119 <<peer_id<<" not found"<<std::endl;
1123 //u8 peer_ser_ver = peer->serialization_version;
1124 u8 peer_ser_ver = getClient(peer->id)->serialization_version;
1132 ToServerCommand command = (ToServerCommand)readU16(&data[0]);
1134 if(command == TOSERVER_INIT)
1136 // [0] u16 TOSERVER_INIT
1137 // [2] u8 SER_FMT_VER_HIGHEST
1138 // [3] u8[20] player_name
1143 derr_server<<DTIME<<"Server: Got TOSERVER_INIT from "
1144 <<peer->id<<std::endl;
1146 // First byte after command is maximum supported
1147 // serialization version
1148 u8 client_max = data[2];
1149 u8 our_max = SER_FMT_VER_HIGHEST;
1150 // Use the highest version supported by both
1151 u8 deployed = core::min_(client_max, our_max);
1152 // If it's lower than the lowest supported, give up.
1153 if(deployed < SER_FMT_VER_LOWEST)
1154 deployed = SER_FMT_VER_INVALID;
1156 //peer->serialization_version = deployed;
1157 getClient(peer->id)->pending_serialization_version = deployed;
1159 if(deployed == SER_FMT_VER_INVALID)
1161 derr_server<<DTIME<<"Server: Cannot negotiate "
1162 "serialization version with peer "
1163 <<peer_id<<std::endl;
1171 Player *player = m_env.getPlayer(peer_id);
1173 // Check if player doesn't exist
1175 throw con::InvalidIncomingDataException
1176 ("Server::ProcessData(): INIT: Player doesn't exist");
1178 // update name if it was supplied
1179 if(datasize >= 20+3)
1182 player->updateName((const char*)&data[3]);
1185 // Now answer with a TOCLIENT_INIT
1187 SharedBuffer<u8> reply(2+1+6);
1188 writeU16(&reply[0], TOCLIENT_INIT);
1189 writeU8(&reply[2], deployed);
1190 writeV3S16(&reply[3], floatToInt(player->getPosition()+v3f(0,BS/2,0)));
1192 m_con.Send(peer_id, 0, reply, true);
1196 if(command == TOSERVER_INIT2)
1198 derr_server<<DTIME<<"Server: Got TOSERVER_INIT2 from "
1199 <<peer->id<<std::endl;
1202 getClient(peer->id)->serialization_version
1203 = getClient(peer->id)->pending_serialization_version;
1206 Send some initialization data
1209 // Send player info to all players
1212 // Send inventory to player
1213 SendInventory(peer->id);
1218 if(peer_ser_ver == SER_FMT_VER_INVALID)
1220 derr_server<<DTIME<<"Server::ProcessData(): Cancelling: Peer"
1221 " serialization format invalid or not initialized."
1222 " Skipping incoming command="<<command<<std::endl;
1226 Player *player = m_env.getPlayer(peer_id);
1229 derr_server<<"Server::ProcessData(): Cancelling: "
1230 "No player for peer_id="<<peer_id
1234 if(command == TOSERVER_PLAYERPOS)
1236 if(datasize < 2+12+12+4+4)
1240 v3s32 ps = readV3S32(&data[start+2]);
1241 v3s32 ss = readV3S32(&data[start+2+12]);
1242 f32 pitch = (f32)readS32(&data[2+12+12]) / 100.0;
1243 f32 yaw = (f32)readS32(&data[2+12+12+4]) / 100.0;
1244 v3f position((f32)ps.X/100., (f32)ps.Y/100., (f32)ps.Z/100.);
1245 v3f speed((f32)ss.X/100., (f32)ss.Y/100., (f32)ss.Z/100.);
1246 pitch = wrapDegrees(pitch);
1247 yaw = wrapDegrees(yaw);
1248 player->setPosition(position);
1249 player->setSpeed(speed);
1250 player->setPitch(pitch);
1251 player->setYaw(yaw);
1253 /*dout_server<<"Server::ProcessData(): Moved player "<<peer_id<<" to "
1254 <<"("<<position.X<<","<<position.Y<<","<<position.Z<<")"
1255 <<" pitch="<<pitch<<" yaw="<<yaw<<std::endl;*/
1257 else if(command == TOSERVER_GOTBLOCKS)
1270 u16 count = data[2];
1271 for(u16 i=0; i<count; i++)
1273 if((s16)datasize < 2+1+(i+1)*6)
1274 throw con::InvalidIncomingDataException
1275 ("GOTBLOCKS length is too short");
1276 v3s16 p = readV3S16(&data[2+1+i*6]);
1277 /*dstream<<"Server: GOTBLOCKS ("
1278 <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
1279 RemoteClient *client = getClient(peer_id);
1280 client->GotBlock(p);
1283 else if(command == TOSERVER_DELETEDBLOCKS)
1296 u16 count = data[2];
1297 for(u16 i=0; i<count; i++)
1299 if((s16)datasize < 2+1+(i+1)*6)
1300 throw con::InvalidIncomingDataException
1301 ("DELETEDBLOCKS length is too short");
1302 v3s16 p = readV3S16(&data[2+1+i*6]);
1303 /*dstream<<"Server: DELETEDBLOCKS ("
1304 <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
1305 RemoteClient *client = getClient(peer_id);
1306 client->SetBlockNotSent(p);
1309 else if(command == TOSERVER_CLICK_OBJECT)
1316 [2] u8 button (0=left, 1=right)
1321 u8 button = readU8(&data[2]);
1323 p.X = readS16(&data[3]);
1324 p.Y = readS16(&data[5]);
1325 p.Z = readS16(&data[7]);
1326 s16 id = readS16(&data[9]);
1327 //u16 item_i = readU16(&data[11]);
1329 MapBlock *block = NULL;
1332 block = m_env.getMap().getBlockNoCreate(p);
1334 catch(InvalidPositionException &e)
1336 derr_server<<"PICK_OBJECT block not found"<<std::endl;
1340 MapBlockObject *obj = block->getObject(id);
1344 derr_server<<"PICK_OBJECT object not found"<<std::endl;
1348 //TODO: Check that object is reasonably close
1353 if(g_settings.getBool("creative_mode") == false)
1356 // Skip if inventory has no free space
1357 if(player->inventory.getUsedSlots() == player->inventory.getSize())
1359 dout_server<<"Player inventory has no free space"<<std::endl;
1363 // Add to inventory and send inventory
1364 InventoryItem *item = new MapBlockObjectItem
1365 (obj->getInventoryString());
1366 player->inventory.addItem(item);
1367 SendInventory(player->peer_id);
1370 // Remove from block
1371 block->removeObject(id);
1374 else if(command == TOSERVER_CLICK_GROUND)
1381 [2] u8 button (0=left, 1=right)
1382 [3] v3s16 nodepos_undersurface
1383 [9] v3s16 nodepos_abovesurface
1386 u8 button = readU8(&data[2]);
1388 p_under.X = readS16(&data[3]);
1389 p_under.Y = readS16(&data[5]);
1390 p_under.Z = readS16(&data[7]);
1392 p_over.X = readS16(&data[9]);
1393 p_over.Y = readS16(&data[11]);
1394 p_over.Z = readS16(&data[13]);
1395 u16 item_i = readU16(&data[15]);
1397 //TODO: Check that target is reasonably close
1400 Left button digs ground
1405 core::map<v3s16, MapBlock*> modified_blocks;
1411 // Get material at position
1412 material = m_env.getMap().getNode(p_under).d;
1413 // If it's air, do nothing
1414 if(material == MATERIAL_AIR)
1419 catch(InvalidPositionException &e)
1421 derr_server<<"Server: Ignoring REMOVENODE: Node not found"
1426 // Reset build time counter
1427 getClient(peer->id)->m_time_from_building.set(0.0);
1431 SharedBuffer<u8> reply(replysize);
1432 writeU16(&reply[0], TOCLIENT_REMOVENODE);
1433 writeS16(&reply[2], p_under.X);
1434 writeS16(&reply[4], p_under.Y);
1435 writeS16(&reply[6], p_under.Z);
1437 m_con.SendToAll(0, reply, true);
1439 if(g_settings.getBool("creative_mode") == false)
1441 // Add to inventory and send inventory
1442 InventoryItem *item = new MaterialItem(material, 1);
1443 player->inventory.addItem(item);
1444 SendInventory(player->peer_id);
1449 (this takes some time so it is done after the quick stuff)
1451 m_env.getMap().removeNodeAndUpdate(p_under, modified_blocks);
1455 Right button places blocks and stuff
1457 else if(button == 1)
1461 InventoryItem *item = player->inventory.getItem(item_i);
1463 // If there is no item, it is not possible to add it anywhere
1468 Handle material items
1470 if(std::string("MaterialItem") == item->getName())
1472 MaterialItem *mitem = (MaterialItem*)item;
1475 n.d = mitem->getMaterial();
1478 // Don't add a node if there isn't air
1479 MapNode n2 = m_env.getMap().getNode(p_over);
1480 if(n2.d != MATERIAL_AIR)
1483 catch(InvalidPositionException &e)
1485 derr_server<<"Server: Ignoring ADDNODE: Node not found"
1490 // Reset build time counter
1491 getClient(peer->id)->m_time_from_building.set(0.0);
1493 if(g_settings.getBool("creative_mode") == false)
1495 // Remove from inventory and send inventory
1496 if(mitem->getCount() == 1)
1497 player->inventory.deleteItem(item_i);
1501 SendInventory(peer_id);
1505 u32 replysize = 8 + MapNode::serializedLength(peer_ser_ver);
1506 SharedBuffer<u8> reply(replysize);
1507 writeU16(&reply[0], TOCLIENT_ADDNODE);
1508 writeS16(&reply[2], p_over.X);
1509 writeS16(&reply[4], p_over.Y);
1510 writeS16(&reply[6], p_over.Z);
1511 n.serialize(&reply[8], peer_ser_ver);
1513 m_con.SendToAll(0, reply, true);
1518 This takes some time so it is done after the quick stuff
1520 core::map<v3s16, MapBlock*> modified_blocks;
1521 m_env.getMap().addNodeAndUpdate(p_over, n, modified_blocks);
1524 Handle block object items
1526 else if(std::string("MBOItem") == item->getName())
1528 MapBlockObjectItem *oitem = (MapBlockObjectItem*)item;
1530 /*dout_server<<"Trying to place a MapBlockObjectItem: "
1531 "inventorystring=\""
1532 <<oitem->getInventoryString()
1533 <<"\""<<std::endl;*/
1535 v3s16 blockpos = getNodeBlockPos(p_over);
1537 MapBlock *block = NULL;
1540 block = m_env.getMap().getBlockNoCreate(blockpos);
1542 catch(InvalidPositionException &e)
1544 derr_server<<"Error while placing object: "
1545 "block not found"<<std::endl;
1549 v3s16 block_pos_i_on_map = block->getPosRelative();
1550 v3f block_pos_f_on_map = intToFloat(block_pos_i_on_map);
1552 v3f pos = intToFloat(p_over);
1553 pos -= block_pos_f_on_map;
1555 /*dout_server<<"pos="
1556 <<"("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"
1560 MapBlockObject *obj = oitem->createObject
1561 (pos, player->getYaw(), player->getPitch());
1564 derr_server<<"WARNING: oitem created NULL object"
1567 block->addObject(obj);
1569 //dout_server<<"Placed object"<<std::endl;
1571 if(g_settings.getBool("creative_mode") == false)
1573 // Remove from inventory and send inventory
1574 player->inventory.deleteItem(item_i);
1576 SendInventory(peer_id);
1582 Catch invalid buttons
1586 derr_server<<"WARNING: Server: Invalid button "
1587 <<button<<std::endl;
1590 else if(command == TOSERVER_RELEASE)
1601 else if(command == TOSERVER_SIGNTEXT)
1610 std::string datastring((char*)&data[2], datasize-2);
1611 std::istringstream is(datastring, std::ios_base::binary);
1614 is.read((char*)buf, 6);
1615 v3s16 blockpos = readV3S16(buf);
1616 is.read((char*)buf, 2);
1617 s16 id = readS16(buf);
1618 is.read((char*)buf, 2);
1619 u16 textlen = readU16(buf);
1621 for(u16 i=0; i<textlen; i++)
1623 is.read((char*)buf, 1);
1624 text += (char)buf[0];
1627 MapBlock *block = NULL;
1630 block = m_env.getMap().getBlockNoCreate(blockpos);
1632 catch(InvalidPositionException &e)
1634 derr_server<<"Error while setting sign text: "
1635 "block not found"<<std::endl;
1639 MapBlockObject *obj = block->getObject(id);
1642 derr_server<<"Error while setting sign text: "
1643 "object not found"<<std::endl;
1647 if(obj->getTypeId() != MAPBLOCKOBJECT_TYPE_SIGN)
1649 derr_server<<"Error while setting sign text: "
1650 "object is not a sign"<<std::endl;
1654 ((SignObject*)obj)->setText(text);
1656 obj->getBlock()->setChangedFlag();
1660 derr_server<<"WARNING: Server::ProcessData(): Ignoring "
1661 "unknown command "<<command<<std::endl;
1665 catch(SendFailedException &e)
1667 derr_server<<"Server::ProcessData(): SendFailedException: "
1673 /*void Server::Send(u16 peer_id, u16 channelnum,
1674 SharedBuffer<u8> data, bool reliable)
1676 JMutexAutoLock lock(m_con_mutex);
1677 m_con.Send(peer_id, channelnum, data, reliable);
1680 void Server::SendBlockNoLock(u16 peer_id, MapBlock *block, u8 ver)
1682 DSTACK(__FUNCTION_NAME);
1684 Create a packet with the block in the right format
1687 std::ostringstream os(std::ios_base::binary);
1688 block->serialize(os, ver);
1689 std::string s = os.str();
1690 SharedBuffer<u8> blockdata((u8*)s.c_str(), s.size());
1692 u32 replysize = 8 + blockdata.getSize();
1693 SharedBuffer<u8> reply(replysize);
1694 v3s16 p = block->getPos();
1695 writeU16(&reply[0], TOCLIENT_BLOCKDATA);
1696 writeS16(&reply[2], p.X);
1697 writeS16(&reply[4], p.Y);
1698 writeS16(&reply[6], p.Z);
1699 memcpy(&reply[8], *blockdata, blockdata.getSize());
1704 m_con.Send(peer_id, 1, reply, true);
1707 /*void Server::SendBlock(u16 peer_id, MapBlock *block, u8 ver)
1709 JMutexAutoLock conlock(m_con_mutex);
1711 SendBlockNoLock(peer_id, block, ver);
1715 void Server::SendSectorMeta(u16 peer_id, core::list<v2s16> ps, u8 ver)
1717 DSTACK(__FUNCTION_NAME);
1718 dstream<<"Server sending sector meta of "
1719 <<ps.getSize()<<" sectors"<<std::endl;
1721 core::list<v2s16>::Iterator i = ps.begin();
1722 core::list<v2s16> sendlist;
1725 if(sendlist.size() == 255 || i == ps.end())
1727 if(sendlist.size() == 0)
1732 [3...] v2s16 pos + sector metadata
1734 std::ostringstream os(std::ios_base::binary);
1737 writeU16(buf, TOCLIENT_SECTORMETA);
1738 os.write((char*)buf, 2);
1740 writeU8(buf, sendlist.size());
1741 os.write((char*)buf, 1);
1743 for(core::list<v2s16>::Iterator
1744 j = sendlist.begin();
1745 j != sendlist.end(); j++)
1748 writeV2S16(buf, *j);
1749 os.write((char*)buf, 4);
1752 Write ClientMapSector metadata
1756 [0] u8 serialization version
1763 In which corners are in these positions
1772 os.write((char*)buf, 1);
1775 // TODO: Get real values
1777 ((ServerMap&)m_env.getMap()).getSectorCorners(*j, corners);
1779 writeS16(buf, corners[0]);
1780 os.write((char*)buf, 2);
1781 writeS16(buf, corners[1]);
1782 os.write((char*)buf, 2);
1783 writeS16(buf, corners[2]);
1784 os.write((char*)buf, 2);
1785 writeS16(buf, corners[3]);
1786 os.write((char*)buf, 2);
1789 SharedBuffer<u8> data((u8*)os.str().c_str(), os.str().size());
1791 /*dstream<<"Server::SendSectorMeta(): sending packet"
1792 " with "<<sendlist.size()<<" sectors"<<std::endl;*/
1794 m_con.Send(peer_id, 1, data, true);
1802 sendlist.push_back(*i);
1808 core::list<PlayerInfo> Server::getPlayerInfo()
1810 DSTACK(__FUNCTION_NAME);
1811 JMutexAutoLock envlock(m_env_mutex);
1812 JMutexAutoLock conlock(m_con_mutex);
1814 core::list<PlayerInfo> list;
1816 core::list<Player*> players = m_env.getPlayers();
1818 core::list<Player*>::Iterator i;
1819 for(i = players.begin();
1820 i != players.end(); i++)
1824 Player *player = *i;
1826 con::Peer *peer = m_con.GetPeer(player->peer_id);
1828 info.address = peer->address;
1829 info.avg_rtt = peer->avg_rtt;
1831 catch(con::PeerNotFoundException &e)
1833 // Outdated peer info
1835 info.address = Address(0,0,0,0,0);
1839 snprintf(info.name, PLAYERNAME_SIZE, "%s", player->getName());
1840 info.position = player->getPosition();
1842 list.push_back(info);
1848 void Server::peerAdded(con::Peer *peer)
1850 DSTACK(__FUNCTION_NAME);
1851 dout_server<<"Server::peerAdded(): peer->id="
1852 <<peer->id<<std::endl;
1854 // Connection is already locked when this is called.
1855 //JMutexAutoLock lock(m_con_mutex);
1858 core::map<u16, RemoteClient*>::Node *n;
1859 n = m_clients.find(peer->id);
1860 // The client shouldn't already exist
1864 RemoteClient *client = new RemoteClient();
1865 client->peer_id = peer->id;
1866 m_clients.insert(client->peer_id, client);
1870 // Already locked when called
1871 //JMutexAutoLock envlock(m_env_mutex);
1873 Player *player = m_env.getPlayer(peer->id);
1875 // The player shouldn't already exist
1876 assert(player == NULL);
1878 player = new RemotePlayer();
1879 player->peer_id = peer->id;
1885 // Get zero sector (it could have been unloaded to disk)
1886 m_env.getMap().emergeSector(v2s16(0,0));
1887 // Get ground height at origin
1888 f32 groundheight = m_env.getMap().getGroundHeight(v2s16(0,0), true);
1889 // The zero sector should have been generated
1890 assert(groundheight > GROUNDHEIGHT_VALID_MINVALUE);
1891 // Don't go underwater
1892 if(groundheight < WATER_LEVEL)
1893 groundheight = WATER_LEVEL;
1895 player->setPosition(intToFloat(v3s16(
1902 Add player to environment
1905 m_env.addPlayer(player);
1908 Add stuff to inventory
1911 if(g_settings.getBool("creative_mode"))
1913 // Give all materials
1914 assert(USEFUL_MATERIAL_COUNT <= PLAYER_INVENTORY_SIZE);
1915 for(u16 i=0; i<USEFUL_MATERIAL_COUNT; i++)
1917 InventoryItem *item = new MaterialItem(i, 1);
1918 player->inventory.addItem(item);
1922 InventoryItem *item = new MapBlockObjectItem("Sign Example text");
1923 bool r = player->inventory.addItem(item);
1928 InventoryItem *item = new MapBlockObjectItem("Rat");
1929 bool r = player->inventory.addItem(item);
1937 InventoryItem *item = new MaterialItem(3, 999);
1938 bool r = player->inventory.addItem(item);
1942 for(u16 i=0; i<4; i++)
1944 InventoryItem *item = new MapBlockObjectItem("Sign Example text");
1945 bool r = player->inventory.addItem(item);
1949 for(u16 i=0; i<4; i++)
1951 InventoryItem *item = new MapBlockObjectItem("Rat");
1952 bool r = player->inventory.addItem(item);
1959 void Server::deletingPeer(con::Peer *peer, bool timeout)
1961 DSTACK(__FUNCTION_NAME);
1962 dout_server<<"Server::deletingPeer(): peer->id="
1963 <<peer->id<<", timeout="<<timeout<<std::endl;
1965 // Connection is already locked when this is called.
1966 //JMutexAutoLock lock(m_con_mutex);
1969 core::map<u16, RemoteClient*>::Node *n;
1970 n = m_clients.find(peer->id);
1971 // The client should exist
1976 // Already locked when called
1977 //JMutexAutoLock envlock(m_env_mutex);
1978 m_env.removePlayer(peer->id);
1982 delete m_clients[peer->id];
1983 m_clients.remove(peer->id);
1985 // Send player info to all clients
1989 void Server::SendObjectData(float dtime)
1991 DSTACK(__FUNCTION_NAME);
1993 core::map<v3s16, bool> stepped_blocks;
1995 for(core::map<u16, RemoteClient*>::Iterator
1996 i = m_clients.getIterator();
1997 i.atEnd() == false; i++)
1999 u16 peer_id = i.getNode()->getKey();
2000 RemoteClient *client = i.getNode()->getValue();
2001 assert(client->peer_id == peer_id);
2003 if(client->serialization_version == SER_FMT_VER_INVALID)
2006 client->SendObjectData(this, dtime, stepped_blocks);
2010 void Server::SendPlayerInfos()
2012 DSTACK(__FUNCTION_NAME);
2014 //JMutexAutoLock envlock(m_env_mutex);
2016 core::list<Player*> players = m_env.getPlayers();
2018 u32 player_count = players.getSize();
2019 u32 datasize = 2+(2+PLAYERNAME_SIZE)*player_count;
2021 SharedBuffer<u8> data(datasize);
2022 writeU16(&data[0], TOCLIENT_PLAYERINFO);
2025 core::list<Player*>::Iterator i;
2026 for(i = players.begin();
2027 i != players.end(); i++)
2029 Player *player = *i;
2031 /*dstream<<"Server sending player info for player with "
2032 "peer_id="<<player->peer_id<<std::endl;*/
2034 writeU16(&data[start], player->peer_id);
2035 snprintf((char*)&data[start+2], PLAYERNAME_SIZE, "%s", player->getName());
2036 start += 2+PLAYERNAME_SIZE;
2039 //JMutexAutoLock conlock(m_con_mutex);
2042 m_con.SendToAll(0, data, true);
2045 void Server::SendInventory(u16 peer_id)
2047 DSTACK(__FUNCTION_NAME);
2049 //JMutexAutoLock envlock(m_env_mutex);
2051 Player* player = m_env.getPlayer(peer_id);
2053 std::ostringstream os;
2054 //os.imbue(std::locale("C"));
2056 player->inventory.serialize(os);
2058 std::string s = os.str();
2060 SharedBuffer<u8> data(s.size()+2);
2061 writeU16(&data[0], TOCLIENT_INVENTORY);
2062 memcpy(&data[2], s.c_str(), s.size());
2064 //JMutexAutoLock conlock(m_con_mutex);
2067 m_con.Send(peer_id, 0, data, true);
2070 void Server::SendBlocks(float dtime)
2072 DSTACK(__FUNCTION_NAME);
2074 JMutexAutoLock envlock(m_env_mutex);
2076 core::array<PrioritySortedBlockTransfer> queue;
2078 s32 total_sending = 0;
2080 for(core::map<u16, RemoteClient*>::Iterator
2081 i = m_clients.getIterator();
2082 i.atEnd() == false; i++)
2084 RemoteClient *client = i.getNode()->getValue();
2085 assert(client->peer_id == i.getNode()->getKey());
2087 total_sending += client->SendingCount();
2089 if(client->serialization_version == SER_FMT_VER_INVALID)
2092 client->GetNextBlocks(this, dtime, queue);
2096 // Lowest priority number comes first.
2097 // Lowest is most important.
2100 JMutexAutoLock conlock(m_con_mutex);
2102 for(u32 i=0; i<queue.size(); i++)
2104 //TODO: Calculate limit dynamically
2105 if(total_sending >= g_settings.getS32
2106 ("max_simultaneous_block_sends_server_total"))
2109 PrioritySortedBlockTransfer q = queue[i];
2111 MapBlock *block = NULL;
2114 block = m_env.getMap().getBlockNoCreate(q.pos);
2116 catch(InvalidPositionException &e)
2121 RemoteClient *client = getClient(q.peer_id);
2123 SendBlockNoLock(q.peer_id, block, client->serialization_version);
2125 client->SentBlock(q.pos);
2132 RemoteClient* Server::getClient(u16 peer_id)
2134 DSTACK(__FUNCTION_NAME);
2135 //JMutexAutoLock lock(m_con_mutex);
2136 core::map<u16, RemoteClient*>::Node *n;
2137 n = m_clients.find(peer_id);
2138 // A client should exist for all peers
2140 return n->getValue();