aboutsummaryrefslogtreecommitdiff
path: root/src/clientiface.cpp
blob: f35dcd0ebf4e1da9dc0a3ea4c05e0bb55bed7eeb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef LOG_HEADER
#define LOG_HEADER

#include <string>

/*
	Use this for logging everything.

	If you need to explicitly print something, use dstream or cout or cerr.
*/

enum LogMessageLevel {
	LMT_ERROR, /* Something failed ("invalid map data on disk, block (2,2,1)") */
	LMT_ACTION, /* In-game actions ("celeron55 placed block at (12,4,-5)") */
	LMT_INFO, /* More deep info ("saving map on disk (only_modified=true)") */
	LMT_VERBOSE, /* Flood-style ("loaded block (2,2,2) from disk") */
	LMT_NUM_VALUES,
};

class ILogOutput
{
public:
	ILogOutput() :
		silence(false)
	{}

	/* line: Full line with timestamp, level and thread */
	virtual void printLog(const std::string &line){};
	/* line: Full line with timestamp, level and thread */
	virtual void printLog(const std::string &line, enum LogMessageLevel lev){};
	/* line: Only actual printed text */
	virtual void printLog(enum LogMessageLevel lev, const std::string &line){};

	bool silence;
};

void log_add_output(ILogOutput *out, enum LogMessageLevel lev);
void log_add_output_maxlev(ILogOutput *out, enum LogMessageLevel lev);
void log_add_output_all_levs(ILogOutput *out);
void log_remove_output(ILogOutput *out);
void log_set_lev_silence(enum LogMessageLevel lev, bool silence);

void log_register_thread(const std::string &name);
void log_deregister_thread();

void log_printline(enum LogMessageLevel lev, const std::string &text);

#define LOGLINEF(lev, ...)\
{\
	char buf[10000];\
	snprintf(buf, 10000, __VA_ARGS__);\
	log_printline(lev, buf);\
}

extern std::ostream errorstream;
extern std::ostream actionstream;
extern std::ostream infostream;
extern std::ostream verbosestream;

extern bool log_trace_level_enabled;

#define TRACESTREAM(x){ if(log_trace_level_enabled) verbosestream x; }
#define TRACEDO(x){ if(log_trace_level_enabled){ x ;} }

#endif

>305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
/*
Minetest
Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <sstream>
#include "clientiface.h"
#include "network/connection.h"
#include "network/serveropcodes.h"
#include "remoteplayer.h"
#include "settings.h"
#include "mapblock.h"
#include "serverenvironment.h"
#include "map.h"
#include "emerge.h"
#include "server/luaentity_sao.h"
#include "server/player_sao.h"
#include "log.h"
#include "util/srp.h"
#include "face_position_cache.h"

const char *ClientInterface::statenames[] = {
	"Invalid",
	"Disconnecting",
	"Denied",
	"Created",
	"AwaitingInit2",
	"HelloSent",
	"InitDone",
	"DefinitionsSent",
	"Active",
	"SudoMode",
};



std::string ClientInterface::state2Name(ClientState state)
{
	return statenames[state];
}

RemoteClient::RemoteClient() :
	m_max_simul_sends(g_settings->getU16("max_simultaneous_block_sends_per_client")),
	m_min_time_from_building(
		g_settings->getFloat("full_block_send_enable_min_time_from_building")),
	m_max_send_distance(g_settings->getS16("max_block_send_distance")),
	m_block_optimize_distance(g_settings->getS16("block_send_optimize_distance")),
	m_max_gen_distance(g_settings->getS16("max_block_generate_distance")),
	m_occ_cull(g_settings->getBool("server_side_occlusion_culling"))
{
}

void RemoteClient::ResendBlockIfOnWire(v3s16 p)
{
	// if this block is on wire, mark it for sending again as soon as possible
	if (m_blocks_sending.find(p) != m_blocks_sending.end()) {
		SetBlockNotSent(p);
	}
}

LuaEntitySAO *getAttachedObject(PlayerSAO *sao, ServerEnvironment *env)
{
	if (!sao->isAttached())
		return nullptr;

	int id;
	std::string bone;
	v3f dummy;
	bool force_visible;
	sao->getAttachment(&id, &bone, &dummy, &dummy, &force_visible);
	ServerActiveObject *ao = env->getActiveObject(id);
	while (id && ao) {
		ao->getAttachment(&id, &bone, &dummy, &dummy, &force_visible);
		if (id)
			ao = env->getActiveObject(id);
	}
	return dynamic_cast<LuaEntitySAO *>(ao);
}

void RemoteClient::GetNextBlocks (
		ServerEnvironment *env,
		EmergeManager * emerge,
		float dtime,
		std::vector<PrioritySortedBlockTransfer> &dest)
{
	// Increment timers
	m_nothing_to_send_pause_timer -= dtime;

	if (m_nothing_to_send_pause_timer >= 0)
		return;

	RemotePlayer *player = env->getPlayer(peer_id);
	// This can happen sometimes; clients and players are not in perfect sync.
	if (!player)
		return;

	PlayerSAO *sao = player->getPlayerSAO();
	if (!sao)
		return;

	// Won't send anything if already sending
	if (m_blocks_sending.size() >= m_max_simul_sends) {
		//infostream<<"Not sending any blocks, Queue full."<<std::endl;
		return;
	}

	v3f playerpos = sao->getBasePosition();
	// if the player is attached, get the velocity from the attached object
	LuaEntitySAO *lsao = getAttachedObject(sao, env);
	const v3f &playerspeed = lsao? lsao->getVelocity() : player->getSpeed();
	v3f playerspeeddir(0,0,0);
	if (playerspeed.getLength() > 1.0f * BS)
		playerspeeddir = playerspeed / playerspeed.getLength();
	// Predict to next block
	v3f playerpos_predicted = playerpos + playerspeeddir * (MAP_BLOCKSIZE * BS);

	v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);

	v3s16 center = getNodeBlockPos(center_nodepos);

	// Camera position and direction
	v3f camera_pos = sao->getEyePosition();
	v3f camera_dir = v3f(0,0,1);
	camera_dir.rotateYZBy(sao->getLookPitch());
	camera_dir.rotateXZBy(sao->getRotation().Y);

	u16 max_simul_sends_usually = m_max_simul_sends;

	/*
		Check the time from last addNode/removeNode.

		Decrease send rate if player is building stuff.
	*/
	m_time_from_building += dtime;
	if (m_time_from_building < m_min_time_from_building) {
		max_simul_sends_usually
			= LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
	}

	/*
		Number of blocks sending + number of blocks selected for sending
	*/
	u32 num_blocks_selected = m_blocks_sending.size();

	/*
		next time d will be continued from the d from which the nearest
		unsent block was found this time.

		This is because not necessarily any of the blocks found this
		time are actually sent.
	*/
	s32 new_nearest_unsent_d = -1;

	// Get view range and camera fov (radians) from the client
	s16 wanted_range = sao->getWantedRange() + 1;
	float camera_fov = sao->getFov();

	/*
		Get the starting value of the block finder radius.
	*/
	if (m_last_center != center) {
		m_nearest_unsent_d = 0;
		m_last_center = center;
	}
	// reset the unsent distance if the view angle has changed more that 10% of the fov
	// (this matches isBlockInSight which allows for an extra 10%)
	if (camera_dir.dotProduct(m_last_camera_dir) < std::cos(camera_fov * 0.1f)) {
		m_nearest_unsent_d = 0;
		m_last_camera_dir = camera_dir;
	}
	if (m_nearest_unsent_d > 0) {
		// make sure any blocks modified since the last time we sent blocks are resent
		for (const v3s16 &p : m_blocks_modified) {
			m_nearest_unsent_d = std::min(m_nearest_unsent_d, center.getDistanceFrom(p));
		}
	}
	m_blocks_modified.clear();

	s16 d_start = m_nearest_unsent_d;

	// Distrust client-sent FOV and get server-set player object property
	// zoom FOV (degrees) as a check to avoid hacked clients using FOV to load
	// distant world.
	// (zoom is disabled by value 0)
	float prop_zoom_fov = sao->getZoomFOV() < 0.001f ?
		0.0f :
		std::max(camera_fov, sao->getZoomFOV() * core::DEGTORAD);

	const s16 full_d_max = std::min(adjustDist(m_max_send_distance, prop_zoom_fov),
		wanted_range);
	const s16 d_opt = std::min(adjustDist(m_block_optimize_distance, prop_zoom_fov),
		wanted_range);
	const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;

	s16 d_max_gen = std::min(adjustDist(m_max_gen_distance, prop_zoom_fov),
		wanted_range);

	s16 d_max = full_d_max;

	// Don't loop very much at a time
	s16 max_d_increment_at_time = 2;
	if (d_max > d_start + max_d_increment_at_time)
		d_max = d_start + max_d_increment_at_time;

	// cos(angle between velocity and camera) * |velocity|
	// Limit to 0.0f in case player moves backwards.
	f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);

	// Reduce the field of view when a player moves and looks forward.
	// limit max fov effect to 50%, 60% at 20n/s fly speed
	camera_fov = camera_fov / (1 + dot / 300.0f);

	s32 nearest_emerged_d = -1;
	s32 nearest_emergefull_d = -1;
	s32 nearest_sent_d = -1;
	//bool queue_is_full = false;

	const v3s16 cam_pos_nodes = floatToInt(camera_pos, BS);

	s16 d;
	for (d = d_start; d <= d_max; d++) {
		/*
			Get the border/face dot coordinates of a "d-radiused"
			box
		*/
		std::vector<v3s16> list = FacePositionCache::getFacePositions(d);

		std::vector<v3s16>::iterator li;
		for (li = list.begin(); li != list.end(); ++li) {
			v3s16 p = *li + center;

			/*
				Send throttling
				- Don't allow too many simultaneous transfers
				- EXCEPT when the blocks are very close

				Also, don't send blocks that are already flying.
			*/

			// Start with the usual maximum
			u16 max_simul_dynamic = max_simul_sends_usually;

			// If block is very close, allow full maximum
			if (d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
				max_simul_dynamic = m_max_simul_sends;

			// Don't select too many blocks for sending
			if (num_blocks_selected >= max_simul_dynamic) {
				//queue_is_full = true;
				goto queue_full_break;
			}

			// Don't send blocks that are currently being transferred
			if (m_blocks_sending.find(p) != m_blocks_sending.end())
				continue;

			/*
				Do not go over max mapgen limit
			*/
			if (blockpos_over_max_limit(p))
				continue;

			// If this is true, inexistent block will be made from scratch
			bool generate = d <= d_max_gen;

			/*
				Don't generate or send if not in sight
				FIXME This only works if the client uses a small enough
				FOV setting. The default of 72 degrees is fine.
				Also retrieve a smaller view cone in the direction of the player's
				movement.
				(0.1 is about 4 degrees)
			*/
			f32 dist;
			if (!(isBlockInSight(p, camera_pos, camera_dir, camera_fov,
						d_blocks_in_sight, &dist) ||
					(playerspeed.getLength() > 1.0f * BS &&
					isBlockInSight(p, camera_pos, playerspeeddir, 0.1f,
						d_blocks_in_sight)))) {
				continue;
			}

			/*
				Don't send already sent blocks
			*/
			if (m_blocks_sent.find(p) != m_blocks_sent.end())
				continue;

			/*
				Check if map has this block
			*/
			MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);

			bool block_not_found = false;
			if (block) {
				// Reset usage timer, this block will be of use in the future.
				block->resetUsageTimer();

				// Check whether the block exists (with data)
				if (block->isDummy() || !block->isGenerated())
					block_not_found = true;

				/*
					If block is not close, don't send it unless it is near
					ground level.

					Block is near ground level if night-time mesh
					differs from day-time mesh.
				*/
				if (d >= d_opt) {
					if (!block->getIsUnderground() && !block->getDayNightDiff())
						continue;
				}

				if (m_occ_cull && !block_not_found &&
						env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
					continue;
				}
			}

			/*
				If block has been marked to not exist on disk (dummy) or is
				not generated and generating new ones is not wanted, skip block.
			*/
			if (!generate && block_not_found) {
				// get next one.
				continue;
			}

			/*
				Add inexistent block to emerge queue.
			*/
			if (block == NULL || block_not_found) {
				if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
					if (nearest_emerged_d == -1)
						nearest_emerged_d = d;
				} else {
					if (nearest_emergefull_d == -1)
						nearest_emergefull_d = d;
					goto queue_full_break;
				}

				// get next one.
				continue;
			}

			if (nearest_sent_d == -1)
				nearest_sent_d = d;

			/*
				Add block to send queue
			*/
			PrioritySortedBlockTransfer q((float)dist, p, peer_id);

			dest.push_back(q);

			num_blocks_selected += 1;
		}
	}
queue_full_break:

	// If nothing was found for sending and nothing was queued for
	// emerging, continue next time browsing from here
	if (nearest_emerged_d != -1) {
		new_nearest_unsent_d = nearest_emerged_d;
	} else if (nearest_emergefull_d != -1) {
		new_nearest_unsent_d = nearest_emergefull_d;
	} else {
		if (d > full_d_max) {
			new_nearest_unsent_d = 0;
			m_nothing_to_send_pause_timer = 2.0f;
		} else {
			if (nearest_sent_d != -1)
				new_nearest_unsent_d = nearest_sent_d;
			else
				new_nearest_unsent_d = d;
		}
	}

	if (new_nearest_unsent_d != -1)
		m_nearest_unsent_d = new_nearest_unsent_d;
}

void RemoteClient::GotBlock(v3s16 p)
{
	if (m_blocks_sending.find(p) != m_blocks_sending.end()) {
		m_blocks_sending.erase(p);
		// only add to sent blocks if it actually was sending
		// (it might have been modified since)
		m_blocks_sent.insert(p);
	} else {
		m_excess_gotblocks++;
	}
}

void RemoteClient::SentBlock(v3s16 p)
{
	if (m_blocks_sending.find(p) == m_blocks_sending.end())
		m_blocks_sending[p] = 0.0f;
	else
		infostream<<"RemoteClient::SentBlock(): Sent block"
				" already in m_blocks_sending"<<std::endl;
}

void RemoteClient::SetBlockNotSent(v3s16 p)
{
	m_nothing_to_send_pause_timer = 0;

	// remove the block from sending and sent sets,
	// and mark as modified if found
	if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
		m_blocks_modified.insert(p);
}

void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
{
	m_nothing_to_send_pause_timer = 0;

	for (auto &block : blocks) {
		v3s16 p = block.first;
		// remove the block from sending and sent sets,
		// and mark as modified if found
		if (m_blocks_sending.erase(p) + m_blocks_sent.erase(p) > 0)
			m_blocks_modified.insert(p);
	}
}

void RemoteClient::notifyEvent(ClientStateEvent event)
{
	std::ostringstream myerror;
	switch (m_state)
	{
	case CS_Invalid:
		//intentionally do nothing
		break;
	case CS_Created:
		switch (event) {
		case CSE_Hello:
			m_state = CS_HelloSent;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;
		/* GotInit2 SetDefinitionsSent SetMediaSent */
		default:
			myerror << "Created: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
		}
		break;
	case CS_Denied:
		/* don't do anything if in denied state */
		break;
	case CS_HelloSent:
		switch(event)
		{
		case CSE_AuthAccept:
			m_state = CS_AwaitingInit2;
			if (chosen_mech == AUTH_MECHANISM_SRP ||
					chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
				srp_verifier_delete((SRPVerifier *) auth_data);
			chosen_mech = AUTH_MECHANISM_NONE;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SetDenied:
			m_state = CS_Denied;
			if (chosen_mech == AUTH_MECHANISM_SRP ||
					chosen_mech == AUTH_MECHANISM_LEGACY_PASSWORD)
				srp_verifier_delete((SRPVerifier *) auth_data);
			chosen_mech = AUTH_MECHANISM_NONE;
			break;
		default:
			myerror << "HelloSent: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
		}
		break;
	case CS_AwaitingInit2:
		switch(event)
		{
		case CSE_GotInit2:
			confirmSerializationVersion();
			m_state = CS_InitDone;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;

		/* Init SetDefinitionsSent SetMediaSent */
		default:
			myerror << "InitSent: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
		}
		break;

	case CS_InitDone:
		switch(event)
		{
		case CSE_SetDefinitionsSent:
			m_state = CS_DefinitionsSent;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;

		/* Init GotInit2 SetMediaSent */
		default:
			myerror << "InitDone: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
		}
		break;
	case CS_DefinitionsSent:
		switch(event)
		{
		case CSE_SetClientReady:
			m_state = CS_Active;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;
		/* Init GotInit2 SetDefinitionsSent */
		default:
			myerror << "DefinitionsSent: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
		}
		break;
	case CS_Active:
		switch(event)
		{
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SudoSuccess:
			m_state = CS_SudoMode;
			if (chosen_mech == AUTH_MECHANISM_SRP)
				srp_verifier_delete((SRPVerifier *) auth_data);
			chosen_mech = AUTH_MECHANISM_NONE;
			break;
		/* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
		default:
			myerror << "Active: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
			break;
		}
		break;
	case CS_SudoMode:
		switch(event)
		{
		case CSE_SetDenied:
			m_state = CS_Denied;
			break;
		case CSE_Disconnect:
			m_state = CS_Disconnecting;
			break;
		case CSE_SudoLeave:
			m_state = CS_Active;
			break;
		default:
			myerror << "Active: Invalid client state transition! " << event;
			throw ClientStateError(myerror.str());
			break;
		}
		break;
	case CS_Disconnecting:
		/* we are already disconnecting */
		break;
	}
}

u64 RemoteClient::uptime() const
{
	return porting::getTimeS() - m_connection_time;
}

ClientInterface::ClientInterface(const std::shared_ptr<con::Connection> & con)
:
	m_con(con),
	m_env(NULL),
	m_print_info_timer(0.0f)
{

}
ClientInterface::~ClientInterface()
{
	/*
		Delete clients
	*/
	{
		RecursiveMutexAutoLock clientslock(m_clients_mutex);

		for (auto &client_it : m_clients) {
			// Delete client
			delete client_it.second;
		}
	}
}

std::vector<session_t> ClientInterface::getClientIDs(ClientState min_state)
{
	std::vector<session_t> reply;
	RecursiveMutexAutoLock clientslock(m_clients_mutex);

	for (const auto &m_client : m_clients) {
		if (m_client.second->getState() >= min_state)
			reply.push_back(m_client.second->peer_id);
	}

	return reply;
}

void ClientInterface::markBlockposAsNotSent(const v3s16 &pos)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	for (const auto &client : m_clients) {
		if (client.second->getState() >= CS_Active)
			client.second->SetBlockNotSent(pos);
	}
}

/**
 * Verify if user limit was reached.
 * User limit count all clients from HelloSent state (MT protocol user) to Active state
 * @return true if user limit was reached
 */
bool ClientInterface::isUserLimitReached()
{
	return getClientIDs(CS_HelloSent).size() >= g_settings->getU16("max_users");
}

void ClientInterface::step(float dtime)
{
	m_print_info_timer += dtime;
	if (m_print_info_timer >= 30.0f) {
		m_print_info_timer = 0.0f;
		UpdatePlayerList();
	}
}

void ClientInterface::UpdatePlayerList()
{
	if (m_env) {
		std::vector<session_t> clients = getClientIDs();
		m_clients_names.clear();

		if (!clients.empty())
			infostream<<"Players:"<<std::endl;

		for (session_t i : clients) {
			RemotePlayer *player = m_env->getPlayer(i);

			if (player == NULL)
				continue;

			infostream << "* " << player->getName() << "\t";

			{
				RecursiveMutexAutoLock clientslock(m_clients_mutex);
				RemoteClient* client = lockedGetClientNoEx(i);
				if (client)
					client->PrintInfo(infostream);
			}

			m_clients_names.emplace_back(player->getName());
		}
	}
}

void ClientInterface::send(session_t peer_id, u8 channelnum,
		NetworkPacket *pkt, bool reliable)
{
	m_con->Send(peer_id, channelnum, pkt, reliable);
}

void ClientInterface::sendToAll(NetworkPacket *pkt)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	for (auto &client_it : m_clients) {
		RemoteClient *client = client_it.second;

		if (client->net_proto_version != 0) {
			m_con->Send(client->peer_id,
					clientCommandFactoryTable[pkt->getCommand()].channel, pkt,
					clientCommandFactoryTable[pkt->getCommand()].reliable);
		}
	}
}

void ClientInterface::sendToAllCompat(NetworkPacket *pkt, NetworkPacket *legacypkt,
		u16 min_proto_ver)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	for (auto &client_it : m_clients) {
		RemoteClient *client = client_it.second;
		NetworkPacket *pkt_to_send = nullptr;

		if (client->net_proto_version >= min_proto_ver) {
			pkt_to_send = pkt;
		} else if (client->net_proto_version != 0) {
			pkt_to_send = legacypkt;
		} else {
			warningstream << "Client with unhandled version to handle: '"
				<< client->net_proto_version << "'";
			continue;
		}

		m_con->Send(client->peer_id,
			clientCommandFactoryTable[pkt_to_send->getCommand()].channel,
			pkt_to_send,
			clientCommandFactoryTable[pkt_to_send->getCommand()].reliable);
	}
}

RemoteClient* ClientInterface::getClientNoEx(session_t peer_id, ClientState state_min)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	RemoteClientMap::const_iterator n = m_clients.find(peer_id);
	// The client may not exist; clients are immediately removed if their
	// access is denied, and this event occurs later then.
	if (n == m_clients.end())
		return NULL;

	if (n->second->getState() >= state_min)
		return n->second;

	return NULL;
}

RemoteClient* ClientInterface::lockedGetClientNoEx(session_t peer_id, ClientState state_min)
{
	RemoteClientMap::const_iterator n = m_clients.find(peer_id);
	// The client may not exist; clients are immediately removed if their
	// access is denied, and this event occurs later then.
	if (n == m_clients.end())
		return NULL;

	if (n->second->getState() >= state_min)
		return n->second;

	return NULL;
}

ClientState ClientInterface::getClientState(session_t peer_id)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	RemoteClientMap::const_iterator n = m_clients.find(peer_id);
	// The client may not exist; clients are immediately removed if their
	// access is denied, and this event occurs later then.
	if (n == m_clients.end())
		return CS_Invalid;

	return n->second->getState();
}

void ClientInterface::setPlayerName(session_t peer_id, const std::string &name)
{
	RecursiveMutexAutoLock clientslock(m_clients_mutex);
	RemoteClientMap::iterator n = m_clients.find(peer_id);
	// The client may not exist; clients are immediately removed if their
	// access is denied, and this event occurs later then.
	if (n != m_clients.end())
		n->second->setName(name);
}

void ClientInterface::DeleteClient(session_t peer_id)
{
	RecursiveMutexAutoLock conlock(m_clients_mutex);

	// Error check
	RemoteClientMap::iterator n = m_clients.find(peer_id);
	// The client may not exist; clients are immediately removed if their
	// access is denied, and this event occurs later then.
	if (n == m_clients.end())
		return;

	/*
		Mark objects to be not known by the client
	*/
	//TODO this should be done by client destructor!!!
	RemoteClient *client = n->second;
	// Handle objects
	for (u16 id : client->m_known_objects) {
		// Get object
		ServerActiveObject* obj = m_env->getActiveObject(id);

		if(obj && obj->m_known_by_count > 0)
			obj->m_known_by_count--;
	}

	// Delete client
	delete m_clients[peer_id];
	m_clients.erase(peer_id);
}

void ClientInterface::CreateClient(session_t peer_id)
{
	RecursiveMutexAutoLock conlock(m_clients_mutex);

	// Error check
	RemoteClientMap::iterator n = m_clients.find(peer_id);
	// The client shouldn't already exist
	if (n != m_clients.end()) return;

	// Create client
	RemoteClient *client = new RemoteClient();
	client->peer_id = peer_id;
	m_clients[client->peer_id] = client;
}

void ClientInterface::event(session_t peer_id, ClientStateEvent event)
{
	{
		RecursiveMutexAutoLock clientlock(m_clients_mutex);

		// Error check
		RemoteClientMap::iterator n = m_clients.find(peer_id);

		// No client to deliver event
		if (n == m_clients.end())
			return;
		n->second->notifyEvent(event);
	}

	if ((event == CSE_SetClientReady) ||
		(event == CSE_Disconnect)     ||
		(event == CSE_SetDenied))
	{
		UpdatePlayerList();
	}
}

u16 ClientInterface::getProtocolVersion(session_t peer_id)
{
	RecursiveMutexAutoLock conlock(m_clients_mutex);

	// Error check
	RemoteClientMap::iterator n = m_clients.find(peer_id);

	// No client to get version
	if (n == m_clients.end())
		return 0;

	return n->second->net_proto_version;
}

void ClientInterface::setClientVersion(session_t peer_id, u8 major, u8 minor, u8 patch,
		const std::string &full)
{
	RecursiveMutexAutoLock conlock(m_clients_mutex);

	// Error check
	RemoteClientMap::iterator n = m_clients.find(peer_id);

	// No client to set versions
	if (n == m_clients.end())
		return;

	n->second->setVersionInfo(major, minor, patch, full);
}