NetworkSession.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe;
 
use pocketmine\entity\effect\EffectInstance;
use pocketmine\event\player\PlayerDuplicateLoginEvent;
use pocketmine\event\player\PlayerResourcePackOfferEvent;
use pocketmine\event\server\DataPacketDecodeEvent;
use pocketmine\event\server\DataPacketReceiveEvent;
use pocketmine\event\server\DataPacketSendEvent;
use pocketmine\form\Form;
use pocketmine\lang\KnownTranslationFactory;
use pocketmine\lang\Translatable;
use pocketmine\math\Vector3;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\StringTag;
use pocketmine\network\mcpe\cache\ChunkCache;
use pocketmine\network\mcpe\compression\CompressBatchPromise;
use pocketmine\network\mcpe\compression\Compressor;
use pocketmine\network\mcpe\compression\DecompressionException;
use pocketmine\network\mcpe\convert\TypeConverter;
use pocketmine\network\mcpe\encryption\DecryptionException;
use pocketmine\network\mcpe\encryption\EncryptionContext;
use pocketmine\network\mcpe\encryption\PrepareEncryptionTask;
use pocketmine\network\mcpe\handler\DeathPacketHandler;
use pocketmine\network\mcpe\handler\HandshakePacketHandler;
use pocketmine\network\mcpe\handler\InGamePacketHandler;
use pocketmine\network\mcpe\handler\LoginPacketHandler;
use pocketmine\network\mcpe\handler\PacketHandler;
use pocketmine\network\mcpe\handler\PreSpawnPacketHandler;
use pocketmine\network\mcpe\handler\ResourcePacksPacketHandler;
use pocketmine\network\mcpe\handler\SessionStartPacketHandler;
use pocketmine\network\mcpe\handler\SpawnResponsePacketHandler;
use pocketmine\network\mcpe\protocol\AvailableCommandsPacket;
use pocketmine\network\mcpe\protocol\ChunkRadiusUpdatedPacket;
use pocketmine\network\mcpe\protocol\ClientboundCloseFormPacket;
use pocketmine\network\mcpe\protocol\ClientboundPacket;
use pocketmine\network\mcpe\protocol\DisconnectPacket;
use pocketmine\network\mcpe\protocol\ModalFormRequestPacket;
use pocketmine\network\mcpe\protocol\MovePlayerPacket;
use pocketmine\network\mcpe\protocol\NetworkChunkPublisherUpdatePacket;
use pocketmine\network\mcpe\protocol\OpenSignPacket;
use pocketmine\network\mcpe\protocol\Packet;
use pocketmine\network\mcpe\protocol\PacketDecodeException;
use pocketmine\network\mcpe\protocol\PacketPool;
use pocketmine\network\mcpe\protocol\PlayerListPacket;
use pocketmine\network\mcpe\protocol\PlayStatusPacket;
use pocketmine\network\mcpe\protocol\ProtocolInfo;
use pocketmine\network\mcpe\protocol\serializer\PacketBatch;
use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
use pocketmine\network\mcpe\protocol\ServerboundPacket;
use pocketmine\network\mcpe\protocol\ServerToClientHandshakePacket;
use pocketmine\network\mcpe\protocol\SetDifficultyPacket;
use pocketmine\network\mcpe\protocol\SetPlayerGameTypePacket;
use pocketmine\network\mcpe\protocol\SetSpawnPositionPacket;
use pocketmine\network\mcpe\protocol\SetTimePacket;
use pocketmine\network\mcpe\protocol\SetTitlePacket;
use pocketmine\network\mcpe\protocol\TextPacket;
use pocketmine\network\mcpe\protocol\ToastRequestPacket;
use pocketmine\network\mcpe\protocol\TransferPacket;
use pocketmine\network\mcpe\protocol\types\AbilitiesData;
use pocketmine\network\mcpe\protocol\types\AbilitiesLayer;
use pocketmine\network\mcpe\protocol\types\BlockPosition;
use pocketmine\network\mcpe\protocol\types\command\CommandData;
use pocketmine\network\mcpe\protocol\types\command\CommandEnum;
use pocketmine\network\mcpe\protocol\types\command\CommandOverload;
use pocketmine\network\mcpe\protocol\types\command\CommandParameter;
use pocketmine\network\mcpe\protocol\types\command\CommandPermissions;
use pocketmine\network\mcpe\protocol\types\CompressionAlgorithm;
use pocketmine\network\mcpe\protocol\types\DimensionIds;
use pocketmine\network\mcpe\protocol\types\PlayerListEntry;
use pocketmine\network\mcpe\protocol\types\PlayerPermissions;
use pocketmine\network\mcpe\protocol\UpdateAbilitiesPacket;
use pocketmine\network\mcpe\protocol\UpdateAdventureSettingsPacket;
use pocketmine\network\NetworkSessionManager;
use pocketmine\network\PacketHandlingException;
use pocketmine\permission\DefaultPermissionNames;
use pocketmine\permission\DefaultPermissions;
use pocketmine\player\GameMode;
use pocketmine\player\Player;
use pocketmine\player\PlayerInfo;
use pocketmine\player\UsedChunkStatus;
use pocketmine\player\XboxLivePlayerInfo;
use pocketmine\promise\Promise;
use pocketmine\promise\PromiseResolver;
use pocketmine\Server;
use pocketmine\timings\Timings;
use pocketmine\utils\AssumptionFailedError;
use pocketmine\utils\BinaryDataException;
use pocketmine\utils\BinaryStream;
use pocketmine\utils\ObjectSet;
use pocketmine\utils\TextFormat;
use pocketmine\world\Position;
use pocketmine\YmlServerProperties;
use function array_map;
use function array_values;
use function base64_encode;
use function bin2hex;
use function count;
use function get_class;
use function implode;
use function in_array;
use function is_string;
use function json_encode;
use function ord;
use function random_bytes;
use function str_split;
use function strcasecmp;
use function strlen;
use function strtolower;
use function substr;
use function time;
use function ucfirst;
use const JSON_THROW_ON_ERROR;
 
class NetworkSession{
    private const INCOMING_PACKET_BATCH_PER_TICK = 2; //usually max 1 per tick, but transactions arrive separately
    private const INCOMING_PACKET_BATCH_BUFFER_TICKS = 100; //enough to account for a 5-second lag spike
 
    private const INCOMING_GAME_PACKETS_PER_TICK = 2;
    private const INCOMING_GAME_PACKETS_BUFFER_TICKS = 100;
 
    private PacketRateLimiter $packetBatchLimiter;
    private PacketRateLimiter $gamePacketLimiter;
 
    private \PrefixedLogger $logger;
    private ?Player $player = null;
    private ?PlayerInfo $info = null;
    private ?int $ping = null;
 
    private ?PacketHandler $handler = null;
 
    private bool $connected = true;
    private bool $disconnectGuard = false;
    private bool $loggedIn = false;
    private bool $authenticated = false;
    private int $connectTime;
    private ?CompoundTag $cachedOfflinePlayerData = null;
 
    private ?EncryptionContext $cipher = null;
 
    private array $sendBuffer = [];
    private array $sendBufferAckPromises = [];
 
    private \SplQueue $compressedQueue;
    private bool $forceAsyncCompression = true;
    private bool $enableCompression = false; //disabled until handshake completed
 
    private int $nextAckReceiptId = 0;
    private array $ackPromisesByReceiptId = [];
 
    private ?InventoryManager $invManager = null;
 
    private ObjectSet $disposeHooks;
 
    public function __construct(
        private Server $server,
        private NetworkSessionManager $manager,
        private PacketPool $packetPool,
        private PacketSender $sender,
        private PacketBroadcaster $broadcaster,
        private EntityEventBroadcaster $entityEventBroadcaster,
        private Compressor $compressor,
        private TypeConverter $typeConverter,
        private string $ip,
        private int $port
    ){
        $this->logger = new \PrefixedLogger($this->server->getLogger(), $this->getLogPrefix());
 
        $this->compressedQueue = new \SplQueue();
 
        $this->disposeHooks = new ObjectSet();
 
        $this->connectTime = time();
        $this->packetBatchLimiter = new PacketRateLimiter("Packet Batches", self::INCOMING_PACKET_BATCH_PER_TICK, self::INCOMING_PACKET_BATCH_BUFFER_TICKS);
        $this->gamePacketLimiter = new PacketRateLimiter("Game Packets", self::INCOMING_GAME_PACKETS_PER_TICK, self::INCOMING_GAME_PACKETS_BUFFER_TICKS);
 
        $this->setHandler(new SessionStartPacketHandler(
            $this,
            $this->onSessionStartSuccess(...)
        ));
 
        $this->manager->add($this);
        $this->logger->info($this->server->getLanguage()->translate(KnownTranslationFactory::pocketmine_network_session_open()));
    }
 
    private function getLogPrefix() : string{
        return "NetworkSession: " . $this->getDisplayName();
    }
 
    public function getLogger() : \Logger{
        return $this->logger;
    }
 
    private function onSessionStartSuccess() : void{
        $this->logger->debug("Session start handshake completed, awaiting login packet");
        $this->flushSendBuffer(true);
        $this->enableCompression = true;
        $this->setHandler(new LoginPacketHandler(
            $this->server,
            $this,
            function(PlayerInfo $info) : void{
                $this->info = $info;
                $this->logger->info($this->server->getLanguage()->translate(KnownTranslationFactory::pocketmine_network_session_playerName(TextFormat::AQUA . $info->getUsername() . TextFormat::RESET)));
                $this->logger->setPrefix($this->getLogPrefix());
                $this->manager->markLoginReceived($this);
            },
            $this->setAuthenticationStatus(...)
        ));
    }
 
    protected function createPlayer() : void{
        $this->server->createPlayer($this, $this->info, $this->authenticated, $this->cachedOfflinePlayerData)->onCompletion(
            $this->onPlayerCreated(...),
            function() : void{
                //TODO: this should never actually occur... right?
                $this->disconnectWithError(
                    reason: "Failed to create player",
                    disconnectScreenMessage: KnownTranslationFactory::pocketmine_disconnect_error_internal()
                );
            }
        );
    }
 
    private function onPlayerCreated(Player $player) : void{
        if(!$this->isConnected()){
            //the remote player might have disconnected before spawn terrain generation was finished
            return;
        }
        $this->player = $player;
        if(!$this->server->addOnlinePlayer($player)){
            return;
        }
 
        $this->invManager = new InventoryManager($this->player, $this);
 
        $effectManager = $this->player->getEffects();
        $effectManager->getEffectAddHooks()->add($effectAddHook = function(EffectInstance $effect, bool $replacesOldEffect) : void{
            $this->entityEventBroadcaster->onEntityEffectAdded([$this], $this->player, $effect, $replacesOldEffect);
        });
        $effectManager->getEffectRemoveHooks()->add($effectRemoveHook = function(EffectInstance $effect) : void{
            $this->entityEventBroadcaster->onEntityEffectRemoved([$this], $this->player, $effect);
        });
        $this->disposeHooks->add(static function() use ($effectManager, $effectAddHook, $effectRemoveHook) : void{
            $effectManager->getEffectAddHooks()->remove($effectAddHook);
            $effectManager->getEffectRemoveHooks()->remove($effectRemoveHook);
        });
 
        $permissionHooks = $this->player->getPermissionRecalculationCallbacks();
        $permissionHooks->add($permHook = function() : void{
            $this->logger->debug("Syncing available commands and abilities/permissions due to permission recalculation");
            $this->syncAbilities($this->player);
            $this->syncAvailableCommands();
        });
        $this->disposeHooks->add(static function() use ($permissionHooks, $permHook) : void{
            $permissionHooks->remove($permHook);
        });
        $this->beginSpawnSequence();
    }
 
    public function getPlayer() : ?Player{
        return $this->player;
    }
 
    public function getPlayerInfo() : ?PlayerInfo{
        return $this->info;
    }
 
    public function isConnected() : bool{
        return $this->connected && !$this->disconnectGuard;
    }
 
    public function getIp() : string{
        return $this->ip;
    }
 
    public function getPort() : int{
        return $this->port;
    }
 
    public function getDisplayName() : string{
        return $this->info !== null ? $this->info->getUsername() : $this->ip . " " . $this->port;
    }
 
    public function getPing() : ?int{
        return $this->ping;
    }
 
    public function updatePing(int $ping) : void{
        $this->ping = $ping;
    }
 
    public function getHandler() : ?PacketHandler{
        return $this->handler;
    }
 
    public function setHandler(?PacketHandler $handler) : void{
        if($this->connected){ //TODO: this is fine since we can't handle anything from a disconnected session, but it might produce surprises in some cases
            $this->handler = $handler;
            if($this->handler !== null){
                $this->handler->setUp();
            }
        }
    }
 
    public function handleEncoded(string $payload) : void{
        if(!$this->connected){
            return;
        }
 
        Timings::$playerNetworkReceive->startTiming();
        try{
            $this->packetBatchLimiter->decrement();
 
            if($this->cipher !== null){
                Timings::$playerNetworkReceiveDecrypt->startTiming();
                try{
                    $payload = $this->cipher->decrypt($payload);
                }catch(DecryptionException $e){
                    $this->logger->debug("Encrypted packet: " . base64_encode($payload));
                    throw PacketHandlingException::wrap($e, "Packet decryption error");
                }finally{
                    Timings::$playerNetworkReceiveDecrypt->stopTiming();
                }
            }
 
            if(strlen($payload) < 1){
                throw new PacketHandlingException("No bytes in payload");
            }
 
            if($this->enableCompression){
                $compressionType = ord($payload[0]);
                $compressed = substr($payload, 1);
                if($compressionType === CompressionAlgorithm::NONE){
                    $decompressed = $compressed;
                }elseif($compressionType === $this->compressor->getNetworkId()){
                    Timings::$playerNetworkReceiveDecompress->startTiming();
                    try{
                        $decompressed = $this->compressor->decompress($compressed);
                    }catch(DecompressionException $e){
                        $this->logger->debug("Failed to decompress packet: " . base64_encode($compressed));
                        throw PacketHandlingException::wrap($e, "Compressed packet batch decode error");
                    }finally{
                        Timings::$playerNetworkReceiveDecompress->stopTiming();
                    }
                }else{
                    throw new PacketHandlingException("Packet compressed with unexpected compression type $compressionType");
                }
            }else{
                $decompressed = $payload;
            }
 
            try{
                $stream = new BinaryStream($decompressed);
                foreach(PacketBatch::decodeRaw($stream) as $buffer){
                    $this->gamePacketLimiter->decrement();
                    $packet = $this->packetPool->getPacket($buffer);
                    if($packet === null){
                        $this->logger->debug("Unknown packet: " . base64_encode($buffer));
                        throw new PacketHandlingException("Unknown packet received");
                    }
                    try{
                        $this->handleDataPacket($packet, $buffer);
                    }catch(PacketHandlingException $e){
                        $this->logger->debug($packet->getName() . ": " . base64_encode($buffer));
                        throw PacketHandlingException::wrap($e, "Error processing " . $packet->getName());
                    }
                }
            }catch(PacketDecodeException|BinaryDataException $e){
                $this->logger->logException($e);
                throw PacketHandlingException::wrap($e, "Packet batch decode error");
            }
        }finally{
            Timings::$playerNetworkReceive->stopTiming();
        }
    }
 
    public function handleDataPacket(Packet $packet, string $buffer) : void{
        if(!($packet instanceof ServerboundPacket)){
            throw new PacketHandlingException("Unexpected non-serverbound packet");
        }
 
        $timings = Timings::getReceiveDataPacketTimings($packet);
        $timings->startTiming();
 
        try{
            if(DataPacketDecodeEvent::hasHandlers()){
                $ev = new DataPacketDecodeEvent($this, $packet->pid(), $buffer);
                $ev->call();
                if($ev->isCancelled()){
                    return;
                }
            }
 
            $decodeTimings = Timings::getDecodeDataPacketTimings($packet);
            $decodeTimings->startTiming();
            try{
                $stream = PacketSerializer::decoder($buffer, 0);
                try{
                    $packet->decode($stream);
                }catch(PacketDecodeException $e){
                    throw PacketHandlingException::wrap($e);
                }
                if(!$stream->feof()){
                    $remains = substr($stream->getBuffer(), $stream->getOffset());
                    $this->logger->debug("Still " . strlen($remains) . " bytes unread in " . $packet->getName() . ": " . bin2hex($remains));
                }
            }finally{
                $decodeTimings->stopTiming();
            }
 
            if(DataPacketReceiveEvent::hasHandlers()){
                $ev = new DataPacketReceiveEvent($this, $packet);
                $ev->call();
                if($ev->isCancelled()){
                    return;
                }
            }
            $handlerTimings = Timings::getHandleDataPacketTimings($packet);
            $handlerTimings->startTiming();
            try{
                if($this->handler === null || !$packet->handle($this->handler)){
                    $this->logger->debug("Unhandled " . $packet->getName() . ": " . base64_encode($stream->getBuffer()));
                }
            }finally{
                $handlerTimings->stopTiming();
            }
        }finally{
            $timings->stopTiming();
        }
    }
 
    public function handleAckReceipt(int $receiptId) : void{
        if(!$this->connected){
            return;
        }
        if(isset($this->ackPromisesByReceiptId[$receiptId])){
            $promises = $this->ackPromisesByReceiptId[$receiptId];
            unset($this->ackPromisesByReceiptId[$receiptId]);
            foreach($promises as $promise){
                $promise->resolve(true);
            }
        }
    }
 
    private function sendDataPacketInternal(ClientboundPacket $packet, bool $immediate, ?PromiseResolver $ackReceiptResolver) : bool{
        if(!$this->connected){
            return false;
        }
        //Basic safety restriction. TODO: improve this
        if(!$this->loggedIn && !$packet->canBeSentBeforeLogin()){
            throw new \InvalidArgumentException("Attempted to send " . get_class($packet) . " to " . $this->getDisplayName() . " too early");
        }
 
        $timings = Timings::getSendDataPacketTimings($packet);
        $timings->startTiming();
        try{
            if(DataPacketSendEvent::hasHandlers()){
                $ev = new DataPacketSendEvent([$this], [$packet]);
                $ev->call();
                if($ev->isCancelled()){
                    return false;
                }
                $packets = $ev->getPackets();
            }else{
                $packets = [$packet];
            }
 
            if($ackReceiptResolver !== null){
                $this->sendBufferAckPromises[] = $ackReceiptResolver;
            }
            foreach($packets as $evPacket){
                $this->addToSendBuffer(self::encodePacketTimed(PacketSerializer::encoder(), $evPacket));
            }
            if($immediate){
                $this->flushSendBuffer(true);
            }
 
            return true;
        }finally{
            $timings->stopTiming();
        }
    }
 
    public function sendDataPacket(ClientboundPacket $packet, bool $immediate = false) : bool{
        return $this->sendDataPacketInternal($packet, $immediate, null);
    }
 
    public function sendDataPacketWithReceipt(ClientboundPacket $packet, bool $immediate = false) : Promise{
        $resolver = new PromiseResolver();
 
        if(!$this->sendDataPacketInternal($packet, $immediate, $resolver)){
            $resolver->reject();
        }
 
        return $resolver->getPromise();
    }
 
    public static function encodePacketTimed(PacketSerializer $serializer, ClientboundPacket $packet) : string{
        $timings = Timings::getEncodeDataPacketTimings($packet);
        $timings->startTiming();
        try{
            $packet->encode($serializer);
            return $serializer->getBuffer();
        }finally{
            $timings->stopTiming();
        }
    }
 
    public function addToSendBuffer(string $buffer) : void{
        $this->sendBuffer[] = $buffer;
    }
 
    private function flushSendBuffer(bool $immediate = false) : void{
        if(count($this->sendBuffer) > 0){
            Timings::$playerNetworkSend->startTiming();
            try{
                $syncMode = null; //automatic
                if($immediate){
                    $syncMode = true;
                }elseif($this->forceAsyncCompression){
                    $syncMode = false;
                }
 
                $stream = new BinaryStream();
                PacketBatch::encodeRaw($stream, $this->sendBuffer);
 
                if($this->enableCompression){
                    $batch = $this->server->prepareBatch($stream->getBuffer(), $this->compressor, $syncMode, Timings::$playerNetworkSendCompressSessionBuffer);
                }else{
                    $batch = $stream->getBuffer();
                }
                $this->sendBuffer = [];
                $ackPromises = $this->sendBufferAckPromises;
                $this->sendBufferAckPromises = [];
                $this->queueCompressedNoBufferFlush($batch, $immediate, $ackPromises);
            }finally{
                Timings::$playerNetworkSend->stopTiming();
            }
        }
    }
 
    public function getBroadcaster() : PacketBroadcaster{ return $this->broadcaster; }
 
    public function getEntityEventBroadcaster() : EntityEventBroadcaster{ return $this->entityEventBroadcaster; }
 
    public function getCompressor() : Compressor{
        return $this->compressor;
    }
 
    public function getTypeConverter() : TypeConverter{ return $this->typeConverter; }
 
    public function queueCompressed(CompressBatchPromise|string $payload, bool $immediate = false) : void{
        Timings::$playerNetworkSend->startTiming();
        try{
            $this->flushSendBuffer($immediate); //Maintain ordering if possible
            $this->queueCompressedNoBufferFlush($payload, $immediate);
        }finally{
            Timings::$playerNetworkSend->stopTiming();
        }
    }
 
    private function queueCompressedNoBufferFlush(CompressBatchPromise|string $batch, bool $immediate = false, array $ackPromises = []) : void{
        Timings::$playerNetworkSend->startTiming();
        try{
            if(is_string($batch)){
                if($immediate){
                    //Skips all queues
                    $this->sendEncoded($batch, true, $ackPromises);
                }else{
                    $this->compressedQueue->enqueue([$batch, $ackPromises]);
                    $this->flushCompressedQueue();
                }
            }elseif($immediate){
                //Skips all queues
                $this->sendEncoded($batch->getResult(), true, $ackPromises);
            }else{
                $this->compressedQueue->enqueue([$batch, $ackPromises]);
                $batch->onResolve(function() : void{
                    if($this->connected){
                        $this->flushCompressedQueue();
                    }
                });
            }
        }finally{
            Timings::$playerNetworkSend->stopTiming();
        }
    }
 
    private function flushCompressedQueue() : void{
        Timings::$playerNetworkSend->startTiming();
        try{
            while(!$this->compressedQueue->isEmpty()){
                [$current, $ackPromises] = $this->compressedQueue->bottom();
                if(is_string($current)){
                    $this->compressedQueue->dequeue();
                    $this->sendEncoded($current, false, $ackPromises);
 
                }elseif($current->hasResult()){
                    $this->compressedQueue->dequeue();
                    $this->sendEncoded($current->getResult(), false, $ackPromises);
 
                }else{
                    //can't send any more queued until this one is ready
                    break;
                }
            }
        }finally{
            Timings::$playerNetworkSend->stopTiming();
        }
    }
 
    private function sendEncoded(string $payload, bool $immediate, array $ackPromises) : void{
        if($this->cipher !== null){
            Timings::$playerNetworkSendEncrypt->startTiming();
            $payload = $this->cipher->encrypt($payload);
            Timings::$playerNetworkSendEncrypt->stopTiming();
        }
 
        if(count($ackPromises) > 0){
            $ackReceiptId = $this->nextAckReceiptId++;
            $this->ackPromisesByReceiptId[$ackReceiptId] = $ackPromises;
        }else{
            $ackReceiptId = null;
        }
        $this->sender->send($payload, $immediate, $ackReceiptId);
    }
 
    private function tryDisconnect(\Closure $func, Translatable|string $reason) : void{
        if($this->connected && !$this->disconnectGuard){
            $this->disconnectGuard = true;
            $func();
            $this->disconnectGuard = false;
            $this->flushSendBuffer(true);
            $this->sender->close("");
            foreach($this->disposeHooks as $callback){
                $callback();
            }
            $this->disposeHooks->clear();
            $this->setHandler(null);
            $this->connected = false;
 
            $ackPromisesByReceiptId = $this->ackPromisesByReceiptId;
            $this->ackPromisesByReceiptId = [];
            foreach($ackPromisesByReceiptId as $resolvers){
                foreach($resolvers as $resolver){
                    $resolver->reject();
                }
            }
            $sendBufferAckPromises = $this->sendBufferAckPromises;
            $this->sendBufferAckPromises = [];
            foreach($sendBufferAckPromises as $resolver){
                $resolver->reject();
            }
 
            $this->logger->info($this->server->getLanguage()->translate(KnownTranslationFactory::pocketmine_network_session_close($reason)));
        }
    }
 
    private function dispose() : void{
        $this->invManager = null;
    }
 
    private function sendDisconnectPacket(Translatable|string $message) : void{
        if($message instanceof Translatable){
            $translated = $this->server->getLanguage()->translate($message);
        }else{
            $translated = $message;
        }
        $this->sendDataPacket(DisconnectPacket::create(0, $translated));
    }
 
    public function disconnect(Translatable|string $reason, Translatable|string|null $disconnectScreenMessage = null, bool $notify = true) : void{
        $this->tryDisconnect(function() use ($reason, $disconnectScreenMessage, $notify) : void{
            if($notify){
                $this->sendDisconnectPacket($disconnectScreenMessage ?? $reason);
            }
            if($this->player !== null){
                $this->player->onPostDisconnect($reason, null);
            }
        }, $reason);
    }
 
    public function disconnectWithError(Translatable|string $reason, Translatable|string|null $disconnectScreenMessage = null) : void{
        $errorId = implode("-", str_split(bin2hex(random_bytes(6)), 4));
 
        $this->disconnect(
            reason: KnownTranslationFactory::pocketmine_disconnect_error($reason, $errorId)->prefix(TextFormat::RED),
            disconnectScreenMessage: KnownTranslationFactory::pocketmine_disconnect_error($disconnectScreenMessage ?? $reason, $errorId),
        );
    }
 
    public function disconnectIncompatibleProtocol(int $protocolVersion) : void{
        $this->tryDisconnect(
            function() use ($protocolVersion) : void{
                $this->sendDataPacket(PlayStatusPacket::create($protocolVersion < ProtocolInfo::CURRENT_PROTOCOL ? PlayStatusPacket::LOGIN_FAILED_CLIENT : PlayStatusPacket::LOGIN_FAILED_SERVER), true);
            },
            KnownTranslationFactory::pocketmine_disconnect_incompatibleProtocol((string) $protocolVersion)
        );
    }
 
    public function transfer(string $ip, int $port, Translatable|string|null $reason = null) : void{
        $reason ??= KnownTranslationFactory::pocketmine_disconnect_transfer();
        $this->tryDisconnect(function() use ($ip, $port, $reason) : void{
            $this->sendDataPacket(TransferPacket::create($ip, $port), true);
            if($this->player !== null){
                $this->player->onPostDisconnect($reason, null);
            }
        }, $reason);
    }
 
    public function onPlayerDestroyed(Translatable|string $reason, Translatable|string $disconnectScreenMessage) : void{
        $this->tryDisconnect(function() use ($disconnectScreenMessage) : void{
            $this->sendDisconnectPacket($disconnectScreenMessage);
        }, $reason);
    }
 
    public function onClientDisconnect(Translatable|string $reason) : void{
        $this->tryDisconnect(function() use ($reason) : void{
            if($this->player !== null){
                $this->player->onPostDisconnect($reason, null);
            }
        }, $reason);
    }
 
    private function setAuthenticationStatus(bool $authenticated, bool $authRequired, Translatable|string|null $error, ?string $clientPubKey) : void{
        if(!$this->connected){
            return;
        }
        if($error === null){
            if($authenticated && !($this->info instanceof XboxLivePlayerInfo)){
                $error = "Expected XUID but none found";
            }elseif($clientPubKey === null){
                $error = "Missing client public key"; //failsafe
            }
        }
 
        if($error !== null){
            $this->disconnectWithError(
                reason: KnownTranslationFactory::pocketmine_disconnect_invalidSession($error),
                disconnectScreenMessage: KnownTranslationFactory::pocketmine_disconnect_error_authentication()
            );
 
            return;
        }
 
        $this->authenticated = $authenticated;
 
        if(!$this->authenticated){
            if($authRequired){
                $this->disconnect("Not authenticated", KnownTranslationFactory::disconnectionScreen_notAuthenticated());
                return;
            }
            if($this->info instanceof XboxLivePlayerInfo){
                $this->logger->warning("Discarding unexpected XUID for non-authenticated player");
                $this->info = $this->info->withoutXboxData();
            }
        }
        $this->logger->debug("Xbox Live authenticated: " . ($this->authenticated ? "YES" : "NO"));
 
        $checkXUID = $this->server->getConfigGroup()->getPropertyBool(YmlServerProperties::PLAYER_VERIFY_XUID, true);
        $myXUID = $this->info instanceof XboxLivePlayerInfo ? $this->info->getXuid() : "";
        $kickForXUIDMismatch = function(string $xuid) use ($checkXUID, $myXUID) : bool{
            if($checkXUID && $myXUID !== $xuid){
                $this->logger->debug("XUID mismatch: expected '$xuid', but got '$myXUID'");
                //TODO: Longer term, we should be identifying playerdata using something more reliable, like XUID or UUID.
                //However, that would be a very disruptive change, so this will serve as a stopgap for now.
                //Side note: this will also prevent offline players hijacking XBL playerdata on online servers, since their
                //XUID will always be empty.
                $this->disconnect("XUID does not match (possible impersonation attempt)");
                return true;
            }
            return false;
        };
 
        foreach($this->manager->getSessions() as $existingSession){
            if($existingSession === $this){
                continue;
            }
            $info = $existingSession->getPlayerInfo();
            if($info !== null && (strcasecmp($info->getUsername(), $this->info->getUsername()) === 0 || $info->getUuid()->equals($this->info->getUuid()))){
                if($kickForXUIDMismatch($info instanceof XboxLivePlayerInfo ? $info->getXuid() : "")){
                    return;
                }
                $ev = new PlayerDuplicateLoginEvent($this, $existingSession, KnownTranslationFactory::disconnectionScreen_loggedinOtherLocation(), null);
                $ev->call();
                if($ev->isCancelled()){
                    $this->disconnect($ev->getDisconnectReason(), $ev->getDisconnectScreenMessage());
                    return;
                }
 
                $existingSession->disconnect($ev->getDisconnectReason(), $ev->getDisconnectScreenMessage());
            }
        }
 
        //TODO: make player data loading async
        //TODO: we shouldn't be loading player data here at all, but right now we don't have any choice :(
        $this->cachedOfflinePlayerData = $this->server->getOfflinePlayerData($this->info->getUsername());
        if($checkXUID){
            $recordedXUID = $this->cachedOfflinePlayerData !== null ? $this->cachedOfflinePlayerData->getTag(Player::TAG_LAST_KNOWN_XUID) : null;
            if(!($recordedXUID instanceof StringTag)){
                $this->logger->debug("No previous XUID recorded, no choice but to trust this player");
            }elseif(!$kickForXUIDMismatch($recordedXUID->getValue())){
                $this->logger->debug("XUID match");
            }
        }
 
        if(EncryptionContext::$ENABLED){
            $this->server->getAsyncPool()->submitTask(new PrepareEncryptionTask($clientPubKey, function(string $encryptionKey, string $handshakeJwt) : void{
                if(!$this->connected){
                    return;
                }
                $this->sendDataPacket(ServerToClientHandshakePacket::create($handshakeJwt), true); //make sure this gets sent before encryption is enabled
 
                $this->cipher = EncryptionContext::fakeGCM($encryptionKey);
 
                $this->setHandler(new HandshakePacketHandler($this->onServerLoginSuccess(...)));
                $this->logger->debug("Enabled encryption");
            }));
        }else{
            $this->onServerLoginSuccess();
        }
    }
 
    private function onServerLoginSuccess() : void{
        $this->loggedIn = true;
 
        $this->sendDataPacket(PlayStatusPacket::create(PlayStatusPacket::LOGIN_SUCCESS));
 
        $this->logger->debug("Initiating resource packs phase");
 
        $packManager = $this->server->getResourcePackManager();
        $resourcePacks = $packManager->getResourceStack();
        $keys = [];
        foreach($resourcePacks as $resourcePack){
            $key = $packManager->getPackEncryptionKey($resourcePack->getPackId());
            if($key !== null){
                $keys[$resourcePack->getPackId()] = $key;
            }
        }
        $event = new PlayerResourcePackOfferEvent($this->info, $resourcePacks, $keys, $packManager->resourcePacksRequired());
        $event->call();
        $this->setHandler(new ResourcePacksPacketHandler($this, $event->getResourcePacks(), $event->getEncryptionKeys(), $event->mustAccept(), function() : void{
            $this->createPlayer();
        }));
    }
 
    private function beginSpawnSequence() : void{
        $this->setHandler(new PreSpawnPacketHandler($this->server, $this->player, $this, $this->invManager));
        $this->player->setNoClientPredictions(); //TODO: HACK: fix client-side falling pre-spawn
 
        $this->logger->debug("Waiting for chunk radius request");
    }
 
    public function notifyTerrainReady() : void{
        $this->logger->debug("Sending spawn notification, waiting for spawn response");
        $this->sendDataPacket(PlayStatusPacket::create(PlayStatusPacket::PLAYER_SPAWN));
        $this->setHandler(new SpawnResponsePacketHandler($this->onClientSpawnResponse(...)));
    }
 
    private function onClientSpawnResponse() : void{
        $this->logger->debug("Received spawn response, entering in-game phase");
        $this->player->setNoClientPredictions(false); //TODO: HACK: we set this during the spawn sequence to prevent the client sending junk movements
        $this->player->doFirstSpawn();
        $this->forceAsyncCompression = false;
        $this->setHandler(new InGamePacketHandler($this->player, $this, $this->invManager));
    }
 
    public function onServerDeath(Translatable|string $deathMessage) : void{
        if($this->handler instanceof InGamePacketHandler){ //TODO: this is a bad fix for pre-spawn death, this shouldn't be reachable at all at this stage :(
            $this->setHandler(new DeathPacketHandler($this->player, $this, $this->invManager ?? throw new AssumptionFailedError(), $deathMessage));
        }
    }
 
    public function onServerRespawn() : void{
        $this->entityEventBroadcaster->syncAttributes([$this], $this->player, $this->player->getAttributeMap()->getAll());
        $this->player->sendData(null);
 
        $this->syncAbilities($this->player);
        $this->invManager->syncAll();
        $this->setHandler(new InGamePacketHandler($this->player, $this, $this->invManager));
    }
 
    public function syncMovement(Vector3 $pos, ?float $yaw = null, ?float $pitch = null, int $mode = MovePlayerPacket::MODE_NORMAL) : void{
        if($this->player !== null){
            $location = $this->player->getLocation();
            $yaw = $yaw ?? $location->getYaw();
            $pitch = $pitch ?? $location->getPitch();
 
            $this->sendDataPacket(MovePlayerPacket::simple(
                $this->player->getId(),
                $this->player->getOffsetPosition($pos),
                $pitch,
                $yaw,
                $yaw, //TODO: head yaw
                $mode,
                $this->player->onGround,
                0, //TODO: riding entity ID
                0 //TODO: tick
            ));
 
            if($this->handler instanceof InGamePacketHandler){
                $this->handler->forceMoveSync = true;
            }
        }
    }
 
    public function syncViewAreaRadius(int $distance) : void{
        $this->sendDataPacket(ChunkRadiusUpdatedPacket::create($distance));
    }
 
    public function syncViewAreaCenterPoint(Vector3 $newPos, int $viewDistance) : void{
        $this->sendDataPacket(NetworkChunkPublisherUpdatePacket::create(BlockPosition::fromVector3($newPos), $viewDistance * 16, [])); //blocks, not chunks >.>
    }
 
    public function syncPlayerSpawnPoint(Position $newSpawn) : void{
        $newSpawnBlockPosition = BlockPosition::fromVector3($newSpawn);
        //TODO: respawn causing block position (bed, respawn anchor)
        $this->sendDataPacket(SetSpawnPositionPacket::playerSpawn($newSpawnBlockPosition, DimensionIds::OVERWORLD, $newSpawnBlockPosition));
    }
 
    public function syncWorldSpawnPoint(Position $newSpawn) : void{
        $this->sendDataPacket(SetSpawnPositionPacket::worldSpawn(BlockPosition::fromVector3($newSpawn), DimensionIds::OVERWORLD));
    }
 
    public function syncGameMode(GameMode $mode, bool $isRollback = false) : void{
        $this->sendDataPacket(SetPlayerGameTypePacket::create($this->typeConverter->coreGameModeToProtocol($mode)));
        if($this->player !== null){
            $this->syncAbilities($this->player);
            $this->syncAdventureSettings(); //TODO: we might be able to do this with the abilities packet alone
        }
        if(!$isRollback && $this->invManager !== null){
            $this->invManager->syncCreative();
        }
    }
 
    public function syncAbilities(Player $for) : void{
        $isOp = $for->hasPermission(DefaultPermissions::ROOT_OPERATOR);
 
        //ALL of these need to be set for the base layer, otherwise the client will cry
        $boolAbilities = [
            AbilitiesLayer::ABILITY_ALLOW_FLIGHT => $for->getAllowFlight(),
            AbilitiesLayer::ABILITY_FLYING => $for->isFlying(),
            AbilitiesLayer::ABILITY_NO_CLIP => !$for->hasBlockCollision(),
            AbilitiesLayer::ABILITY_OPERATOR => $isOp,
            AbilitiesLayer::ABILITY_TELEPORT => $for->hasPermission(DefaultPermissionNames::COMMAND_TELEPORT_SELF),
            AbilitiesLayer::ABILITY_INVULNERABLE => $for->isCreative(),
            AbilitiesLayer::ABILITY_MUTED => false,
            AbilitiesLayer::ABILITY_WORLD_BUILDER => false,
            AbilitiesLayer::ABILITY_INFINITE_RESOURCES => !$for->hasFiniteResources(),
            AbilitiesLayer::ABILITY_LIGHTNING => false,
            AbilitiesLayer::ABILITY_BUILD => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_MINE => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_DOORS_AND_SWITCHES => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_OPEN_CONTAINERS => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_ATTACK_PLAYERS => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_ATTACK_MOBS => !$for->isSpectator(),
            AbilitiesLayer::ABILITY_PRIVILEGED_BUILDER => false,
        ];
 
        $layers = [
            //TODO: dynamic flying speed! FINALLY!!!!!!!!!!!!!!!!!
            new AbilitiesLayer(AbilitiesLayer::LAYER_BASE, $boolAbilities, 0.05, 0.1),
        ];
        if(!$for->hasBlockCollision()){
            //TODO: HACK! In 1.19.80, the client starts falling in our faux spectator mode when it clips into a
            //block. We can't seem to prevent this short of forcing the player to always fly when block collision is
            //disabled. Also, for some reason the client always reads flight state from this layer if present, even
            //though the player isn't in spectator mode.
 
            $layers[] = new AbilitiesLayer(AbilitiesLayer::LAYER_SPECTATOR, [
                AbilitiesLayer::ABILITY_FLYING => true,
            ], null, null);
        }
 
        $this->sendDataPacket(UpdateAbilitiesPacket::create(new AbilitiesData(
            $isOp ? CommandPermissions::OPERATOR : CommandPermissions::NORMAL,
            $isOp ? PlayerPermissions::OPERATOR : PlayerPermissions::MEMBER,
            $for->getId(),
            $layers
        )));
    }
 
    public function syncAdventureSettings() : void{
        if($this->player === null){
            throw new \LogicException("Cannot sync adventure settings for a player that is not yet created");
        }
        //everything except auto jump is handled via UpdateAbilitiesPacket
        $this->sendDataPacket(UpdateAdventureSettingsPacket::create(
            noAttackingMobs: false,
            noAttackingPlayers: false,
            worldImmutable: false,
            showNameTags: true,
            autoJump: $this->player->hasAutoJump()
        ));
    }
 
    public function syncAvailableCommands() : void{
        $commandData = [];
        foreach($this->server->getCommandMap()->getCommands() as $name => $command){
            if(isset($commandData[$command->getLabel()]) || $command->getLabel() === "help" || !$command->testPermissionSilent($this->player)){
                continue;
            }
 
            $lname = strtolower($command->getLabel());
            $aliases = $command->getAliases();
            $aliasObj = null;
            if(count($aliases) > 0){
                if(!in_array($lname, $aliases, true)){
                    //work around a client bug which makes the original name not show when aliases are used
                    $aliases[] = $lname;
                }
                $aliasObj = new CommandEnum(ucfirst($command->getLabel()) . "Aliases", array_values($aliases));
            }
 
            $description = $command->getDescription();
            $data = new CommandData(
                $lname, //TODO: commands containing uppercase letters in the name crash 1.9.0 client
                $description instanceof Translatable ? $this->player->getLanguage()->translate($description) : $description,
                0,
                0,
                $aliasObj,
                [
                    new CommandOverload(chaining: false, parameters: [CommandParameter::standard("args", AvailableCommandsPacket::ARG_TYPE_RAWTEXT, 0, true)])
                ],
                chainedSubCommandData: []
            );
 
            $commandData[$command->getLabel()] = $data;
        }
 
        $this->sendDataPacket(AvailableCommandsPacket::create($commandData, [], [], []));
    }
 
    public function prepareClientTranslatableMessage(Translatable $message) : array{
        //we can't send nested translations to the client, so make sure they are always pre-translated by the server
        $language = $this->player->getLanguage();
        $parameters = array_map(fn(string|Translatable $p) => $p instanceof Translatable ? $language->translate($p) : $p, $message->getParameters());
        return [$language->translateString($message->getText(), $parameters, "pocketmine."), $parameters];
    }
 
    public function onChatMessage(Translatable|string $message) : void{
        if($message instanceof Translatable){
            if(!$this->server->isLanguageForced()){
                $this->sendDataPacket(TextPacket::translation(...$this->prepareClientTranslatableMessage($message)));
            }else{
                $this->sendDataPacket(TextPacket::raw($this->player->getLanguage()->translate($message)));
            }
        }else{
            $this->sendDataPacket(TextPacket::raw($message));
        }
    }
 
    public function onJukeboxPopup(Translatable|string $message) : void{
        $parameters = [];
        if($message instanceof Translatable){
            if(!$this->server->isLanguageForced()){
                [$message, $parameters] = $this->prepareClientTranslatableMessage($message);
            }else{
                $message = $this->player->getLanguage()->translate($message);
            }
        }
        $this->sendDataPacket(TextPacket::jukeboxPopup($message, $parameters));
    }
 
    public function onPopup(string $message) : void{
        $this->sendDataPacket(TextPacket::popup($message));
    }
 
    public function onTip(string $message) : void{
        $this->sendDataPacket(TextPacket::tip($message));
    }
 
    public function onFormSent(int $id, Form $form) : bool{
        return $this->sendDataPacket(ModalFormRequestPacket::create($id, json_encode($form, JSON_THROW_ON_ERROR)));
    }
 
    public function onCloseAllForms() : void{
        $this->sendDataPacket(ClientboundCloseFormPacket::create());
    }
 
    public function startUsingChunk(int $chunkX, int $chunkZ, \Closure $onCompletion) : void{
        $world = $this->player->getLocation()->getWorld();
        ChunkCache::getInstance($world, $this->compressor)->request($chunkX, $chunkZ)->onResolve(
 
            //this callback may be called synchronously or asynchronously, depending on whether the promise is resolved yet
            function(CompressBatchPromise $promise) use ($world, $onCompletion, $chunkX, $chunkZ) : void{
                if(!$this->isConnected()){
                    return;
                }
                $currentWorld = $this->player->getLocation()->getWorld();
                if($world !== $currentWorld || ($status = $this->player->getUsedChunkStatus($chunkX, $chunkZ)) === null){
                    $this->logger->debug("Tried to send no-longer-active chunk $chunkX $chunkZ in world " . $world->getFolderName());
                    return;
                }
                if($status !== UsedChunkStatus::REQUESTED_SENDING){
                    //TODO: make this an error
                    //this could be triggered due to the shitty way that chunk resends are handled
                    //right now - not because of the spammy re-requesting, but because the chunk status reverts
                    //to NEEDED if they want to be resent.
                    return;
                }
                $world->timings->syncChunkSend->startTiming();
                try{
                    $this->queueCompressed($promise);
                    $onCompletion();
                }finally{
                    $world->timings->syncChunkSend->stopTiming();
                }
            }
        );
    }
 
    public function stopUsingChunk(int $chunkX, int $chunkZ) : void{
 
    }
 
    public function onEnterWorld() : void{
        if($this->player !== null){
            $world = $this->player->getWorld();
            $this->syncWorldTime($world->getTime());
            $this->syncWorldDifficulty($world->getDifficulty());
            $this->syncWorldSpawnPoint($world->getSpawnLocation());
            //TODO: weather needs to be synced here (when implemented)
        }
    }
 
    public function syncWorldTime(int $worldTime) : void{
        $this->sendDataPacket(SetTimePacket::create($worldTime));
    }
 
    public function syncWorldDifficulty(int $worldDifficulty) : void{
        $this->sendDataPacket(SetDifficultyPacket::create($worldDifficulty));
    }
 
    public function getInvManager() : ?InventoryManager{
        return $this->invManager;
    }
 
    public function syncPlayerList(array $players) : void{
        $this->sendDataPacket(PlayerListPacket::add(array_map(function(Player $player) : PlayerListEntry{
            return PlayerListEntry::createAdditionEntry($player->getUniqueId(), $player->getId(), $player->getDisplayName(), $this->typeConverter->getSkinAdapter()->toSkinData($player->getSkin()), $player->getXuid());
        }, $players)));
    }
 
    public function onPlayerAdded(Player $p) : void{
        $this->sendDataPacket(PlayerListPacket::add([PlayerListEntry::createAdditionEntry($p->getUniqueId(), $p->getId(), $p->getDisplayName(), $this->typeConverter->getSkinAdapter()->toSkinData($p->getSkin()), $p->getXuid())]));
    }
 
    public function onPlayerRemoved(Player $p) : void{
        if($p !== $this->player){
            $this->sendDataPacket(PlayerListPacket::remove([PlayerListEntry::createRemovalEntry($p->getUniqueId())]));
        }
    }
 
    public function onTitle(string $title) : void{
        $this->sendDataPacket(SetTitlePacket::title($title));
    }
 
    public function onSubTitle(string $subtitle) : void{
        $this->sendDataPacket(SetTitlePacket::subtitle($subtitle));
    }
 
    public function onActionBar(string $actionBar) : void{
        $this->sendDataPacket(SetTitlePacket::actionBarMessage($actionBar));
    }
 
    public function onClearTitle() : void{
        $this->sendDataPacket(SetTitlePacket::clearTitle());
    }
 
    public function onResetTitleOptions() : void{
        $this->sendDataPacket(SetTitlePacket::resetTitleOptions());
    }
 
    public function onTitleDuration(int $fadeIn, int $stay, int $fadeOut) : void{
        $this->sendDataPacket(SetTitlePacket::setAnimationTimes($fadeIn, $stay, $fadeOut));
    }
 
    public function onToastNotification(string $title, string $body) : void{
        $this->sendDataPacket(ToastRequestPacket::create($title, $body));
    }
 
    public function onOpenSignEditor(Vector3 $signPosition, bool $frontSide) : void{
        $this->sendDataPacket(OpenSignPacket::create(BlockPosition::fromVector3($signPosition), $frontSide));
    }
 
    public function tick() : void{
        if(!$this->isConnected()){
            $this->dispose();
            return;
        }
 
        if($this->info === null){
            if(time() >= $this->connectTime + 10){
                $this->disconnectWithError(KnownTranslationFactory::pocketmine_disconnect_error_loginTimeout());
            }
 
            return;
        }
 
        if($this->player !== null){
            $this->player->doChunkRequests();
 
            $dirtyAttributes = $this->player->getAttributeMap()->needSend();
            $this->entityEventBroadcaster->syncAttributes([$this], $this->player, $dirtyAttributes);
            foreach($dirtyAttributes as $attribute){
                //TODO: we might need to send these to other players in the future
                //if that happens, this will need to become more complex than a flag on the attribute itself
                $attribute->markSynchronized();
            }
        }
        Timings::$playerNetworkSendInventorySync->startTiming();
        try{
            $this->invManager?->flushPendingUpdates();
        }finally{
            Timings::$playerNetworkSendInventorySync->stopTiming();
        }
 
        $this->flushSendBuffer();
    }
}