//! Connections to the server after logging in. /// Contains the [`Event`] enum and related data types. mod event; use std::collections::{HashSet, VecDeque}; use std::iter::FusedIterator; use std::time::Duration; use bitfield_struct::bitfield; pub use event::*; use flume::{Receiver, Sender, TrySendError}; use rayon::iter::ParallelIterator; use uuid::Uuid; use vek::Vec3; use crate::biome::Biome; use crate::block_pos::BlockPos; use crate::chunk_pos::ChunkPos; use crate::config::Config; use crate::dimension::DimensionId; use crate::entity::types::Player; use crate::entity::{velocity_to_packet_units, Entities, Entity, EntityId, EntityKind}; use crate::player_textures::SignedPlayerTextures; use crate::protocol_inner::packets::play::c2s::{ C2sPlayPacket, DiggingStatus, InteractKind, PlayerCommandId, }; pub use crate::protocol_inner::packets::play::s2c::SetTitleAnimationTimes as TitleAnimationTimes; use crate::protocol_inner::packets::play::s2c::{ Animate, BiomeRegistry, BlockChangeAck, ChatType, ChatTypeChat, ChatTypeNarration, ChatTypeRegistry, ChatTypeRegistryEntry, ClearTitles, DimensionTypeRegistry, DimensionTypeRegistryEntry, Disconnect, EntityEvent, ForgetLevelChunk, GameEvent, GameEventReason, KeepAlive, Login, MoveEntityPosition, MoveEntityPositionAndRotation, MoveEntityRotation, PlayerPosition, PlayerPositionFlags, RegistryCodec, RemoveEntities, Respawn, RotateHead, S2cPlayPacket, SetChunkCacheCenter, SetChunkCacheRadius, SetEntityMetadata, SetEntityMotion, SetSubtitleText, SetTitleText, SpawnPosition, SystemChat, TeleportEntity, UpdateAttributes, UpdateAttributesProperty, ENTITY_EVENT_MAX_BOUND, }; use crate::protocol_inner::{BoundedInt, ByteAngle, Nbt, RawBytes, VarInt}; use crate::server::{C2sPacketChannels, NewClientData, SharedServer}; use crate::slotmap::{Key, SlotMap}; use crate::text::Text; use crate::util::{chunks_in_view_distance, is_chunk_in_view_distance}; use crate::world::{WorldId, Worlds}; use crate::{ident, Ticks, LIBRARY_NAMESPACE}; /// A container for all [`Client`]s on a [`Server`](crate::server::Server). /// /// New clients are automatically inserted into this container but /// are not automatically deleted. It is your responsibility to delete them once /// they disconnect. This can be checked with [`Client::is_disconnected`]. pub struct Clients { sm: SlotMap>, } impl Clients { pub(crate) fn new() -> Self { Self { sm: SlotMap::new() } } pub(crate) fn insert(&mut self, client: Client) -> (ClientId, &mut Client) { let (id, client) = self.sm.insert(client); (ClientId(id), client) } /// Removes a client from the server. /// /// If the given client ID is valid, `true` is returned and the client is /// deleted. Otherwise, `false` is returned and the function has no effect. pub fn delete(&mut self, client: ClientId) -> bool { self.sm.remove(client.0).is_some() } /// Deletes all clients from the server (as if by [`Self::delete`]) for /// which `f` returns `true`. /// /// All clients are visited in an unspecified order. pub fn retain(&mut self, mut f: impl FnMut(ClientId, &mut Client) -> bool) { self.sm.retain(|k, v| f(ClientId(k), v)) } /// Returns the number of clients on the server. This includes clients /// which may be disconnected. pub fn count(&self) -> usize { self.sm.len() } /// Returns a shared reference to the client with the given ID. If /// the ID is invalid, then `None` is returned. pub fn get(&self, client: ClientId) -> Option<&Client> { self.sm.get(client.0) } /// Returns an exclusive reference to the client with the given ID. If the /// ID is invalid, then `None` is returned. pub fn get_mut(&mut self, client: ClientId) -> Option<&mut Client> { self.sm.get_mut(client.0) } /// Returns an immutable iterator over all clients on the server in an /// unspecified order. pub fn iter(&self) -> impl FusedIterator)> + Clone + '_ { self.sm.iter().map(|(k, v)| (ClientId(k), v)) } /// Returns a mutable iterator over all clients on the server in an /// unspecified order. pub fn iter_mut(&mut self) -> impl FusedIterator)> + '_ { self.sm.iter_mut().map(|(k, v)| (ClientId(k), v)) } /// Returns a parallel immutable iterator over all clients on the server in /// an unspecified order. pub fn par_iter(&self) -> impl ParallelIterator)> + Clone + '_ { self.sm.par_iter().map(|(k, v)| (ClientId(k), v)) } /// Returns a parallel mutable iterator over all clients on the server in an /// unspecified order. pub fn par_iter_mut( &mut self, ) -> impl ParallelIterator)> + '_ { self.sm.par_iter_mut().map(|(k, v)| (ClientId(k), v)) } } /// An identifier for a [`Client`] on the server. /// /// Client IDs are either _valid_ or _invalid_. Valid client IDs point to /// clients that have not been deleted, while invalid IDs point to those that /// have. Once an ID becomes invalid, it will never become valid again. /// /// The [`Ord`] instance on this type is correct but otherwise unspecified. This /// is useful for storing IDs in containers such as /// [`BTreeMap`](std::collections::BTreeMap). #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default, Debug)] pub struct ClientId(Key); impl ClientId { /// The value of the default client ID which is always invalid. pub const NULL: Self = Self(Key::NULL); } /// Represents a remote connection to a client after successfully logging in. /// /// Much like an [`Entity`], clients posess a location, rotation, and UUID. /// However, clients are handled separately from entities and are partially /// managed by the library. /// /// By default, clients have no influence over the worlds they reside in. They /// cannot break blocks, hurt entities, or see other clients. Interactions with /// the server must be handled explicitly with [`Self::pop_event`]. /// /// Additionally, clients posess [`Player`] entity data which is only visible to /// themselves. This can be accessed with [`Self::player`] and /// [`Self::player_mut`]. /// /// # The Difference Between a "Client" and a "Player" /// /// Normally in Minecraft, players and clients are one and the same. Players are /// simply a special type of entity which is backed by a remote connection. /// /// In Valence however, clients and players have been decoupled. This separation /// was done primarily to enable multithreaded client updates. pub struct Client { /// Custom data. pub data: C::ClientData, /// Setting this to `None` disconnects the client. send: SendOpt, recv: Receiver, /// The tick this client was created. created_tick: Ticks, uuid: Uuid, username: String, textures: Option, world: WorldId, new_position: Vec3, old_position: Vec3, /// Measured in degrees yaw: f32, /// Measured in degrees pitch: f32, /// Counts up as teleports are made. teleport_id_counter: u32, /// The number of pending client teleports that have yet to receive a /// confirmation. Inbound client position packets are ignored while this /// is nonzero. pending_teleports: u32, spawn_position: BlockPos, spawn_position_yaw: f32, death_location: Option<(DimensionId, BlockPos)>, events: VecDeque, /// The ID of the last keepalive sent. last_keepalive_id: i64, new_max_view_distance: u8, old_max_view_distance: u8, /// Entities that were visible to this client at the end of the last tick. /// This is used to determine what entity create/destroy packets should be /// sent. loaded_entities: HashSet, loaded_chunks: HashSet, new_game_mode: GameMode, old_game_mode: GameMode, settings: Option, dug_blocks: Vec, /// Should be sent after login packet. msgs_to_send: Vec, attack_speed: f64, movement_speed: f64, flags: ClientFlags, /// The data for the client's own player entity. player_data: Player, } #[bitfield(u16)] pub(crate) struct ClientFlags { spawn: bool, sneaking: bool, sprinting: bool, jumping_with_horse: bool, on_ground: bool, /// If any of position, yaw, or pitch were modified by the /// user this tick. teleported_this_tick: bool, /// If spawn_position or spawn_position_yaw were modified this tick. modified_spawn_position: bool, /// If the last sent keepalive got a response. got_keepalive: bool, hardcore: bool, attack_speed_modified: bool, movement_speed_modified: bool, #[bits(5)] _pad: u8, } impl Client { pub(crate) fn new( packet_channels: C2sPacketChannels, server: &SharedServer, ncd: NewClientData, data: C::ClientData, ) -> Self { let (send, recv) = packet_channels; Self { data, send: Some(send), recv, created_tick: server.current_tick(), uuid: ncd.uuid, username: ncd.username, textures: ncd.textures, world: WorldId::default(), new_position: Vec3::default(), old_position: Vec3::default(), yaw: 0.0, pitch: 0.0, teleport_id_counter: 0, pending_teleports: 0, spawn_position: BlockPos::default(), spawn_position_yaw: 0.0, death_location: None, events: VecDeque::new(), last_keepalive_id: 0, new_max_view_distance: 16, old_max_view_distance: 0, loaded_entities: HashSet::new(), loaded_chunks: HashSet::new(), new_game_mode: GameMode::Survival, old_game_mode: GameMode::Survival, settings: None, dug_blocks: Vec::new(), msgs_to_send: Vec::new(), attack_speed: 4.0, movement_speed: 0.7, flags: ClientFlags::new() .with_modified_spawn_position(true) .with_got_keepalive(true), player_data: Player::new(), } } /// Gets the tick that this client was created. pub fn created_tick(&self) -> Ticks { self.created_tick } /// Gets the client's UUID. pub fn uuid(&self) -> Uuid { self.uuid } /// Gets the username of this client, which is always valid. pub fn username(&self) -> &str { &self.username } /// Gets the player textures of this client. If the client does not have /// a skin, then `None` is returned. pub fn textures(&self) -> Option<&SignedPlayerTextures> { self.textures.as_ref() } /// Gets the world this client is located in. pub fn world(&self) -> WorldId { self.world } /// Changes the world this client is located in. /// /// The given [`WorldId`] must be valid. Otherwise, the client is /// disconnected. pub fn spawn(&mut self, world: WorldId) { self.world = world; self.flags.set_spawn(true); } /// Sends a system message to the player which is visible in the chat. pub fn send_message(&mut self, msg: impl Into) { // We buffer messages because weird things happen if we send them before the // login packet. self.msgs_to_send.push(msg.into()); } /// Gets the absolute position of this client in the world it is located /// in. pub fn position(&self) -> Vec3 { self.new_position } /// Changes the position and rotation of this client in the world it is /// located in. /// /// If you want to change the client's world, use [`Self::spawn`]. pub fn teleport(&mut self, pos: impl Into>, yaw: f32, pitch: f32) { self.new_position = pos.into(); self.yaw = yaw; self.pitch = pitch; if !self.flags.teleported_this_tick() { self.flags.set_teleported_this_tick(true); self.pending_teleports = match self.pending_teleports.checked_add(1) { Some(n) => n, None => { log::warn!("too many pending teleports for {}", self.username()); self.disconnect_no_reason(); return; } }; self.teleport_id_counter = self.teleport_id_counter.wrapping_add(1); } } pub fn set_velocity(&mut self, velocity: impl Into>) { self.send_packet(SetEntityMotion { entity_id: VarInt(0), velocity: velocity_to_packet_units(velocity.into()), }); } /// Gets this client's yaw. pub fn yaw(&self) -> f32 { self.yaw } /// Gets this client's pitch. pub fn pitch(&self) -> f32 { self.pitch } /// Gets the spawn position. The client will see `minecraft:compass` items /// point at the returned position. pub fn spawn_position(&self) -> BlockPos { self.spawn_position } /// Sets the spawn position. The client will see `minecraft:compass` items /// point at the provided position. pub fn set_spawn_position(&mut self, pos: impl Into, yaw_degrees: f32) { let pos = pos.into(); if pos != self.spawn_position || yaw_degrees != self.spawn_position_yaw { self.spawn_position = pos; self.spawn_position_yaw = yaw_degrees; self.flags.set_modified_spawn_position(true); } } /// Gets the last death location of this client. The client will see /// `minecraft:recovery_compass` items point at the returned position. /// If the client's current dimension differs from the returned /// dimension or the location is `None` then the compass will spin /// randomly. pub fn death_location(&self) -> Option<(DimensionId, BlockPos)> { self.death_location } /// Sets the last death location. The client will see /// `minecraft:recovery_compass` items point at the provided position. /// If the client's current dimension differs from the provided /// dimension or the location is `None` then the compass will spin /// randomly. /// /// Changes to the last death location take effect when the client /// (re)spawns. pub fn set_death_location(&mut self, location: Option<(DimensionId, BlockPos)>) { self.death_location = location; } /// Gets the client's game mode. pub fn game_mode(&self) -> GameMode { self.new_game_mode } /// Sets the client's game mode. pub fn set_game_mode(&mut self, game_mode: GameMode) { self.new_game_mode = game_mode; } /// Sets the title this client sees. /// /// A title is a large piece of text displayed in the center of the screen /// which may also include a subtitle underneath it. The title /// can be configured to fade in and out using the /// [`TitleAnimationTimes`] struct. pub fn set_title( &mut self, title: impl Into, subtitle: impl Into, animation: impl Into>, ) { let title = title.into(); let subtitle = subtitle.into(); self.send_packet(SetTitleText { text: title }); if !subtitle.is_empty() { self.send_packet(SetSubtitleText { subtitle_text: subtitle, }); } if let Some(anim) = animation.into() { self.send_packet(anim); } } /// Gets the attack cooldown speed. pub fn attack_speed(&self) -> f64 { self.attack_speed } /// Sets the attack cooldown speed. pub fn set_attack_speed(&mut self, speed: f64) { if self.attack_speed != speed { self.attack_speed = speed; self.flags.set_attack_speed_modified(true); } } /// Gets the speed at which the client can run on the ground. pub fn movement_speed(&self) -> f64 { self.movement_speed } /// Sets the speed at which the client can run on the ground. pub fn set_movement_speed(&mut self, speed: f64) { if self.movement_speed != speed { self.movement_speed = speed; self.flags.set_movement_speed_modified(true); } } /// Removes the current title from the client's screen. pub fn clear_title(&mut self) { self.send_packet(ClearTitles { reset: true }); } /// Gets if the client is on the ground, as determined by the client. pub fn on_ground(&self) -> bool { self.flags.on_ground() } /// Gets whether or not the client is connected to the server. /// /// A disconnected client object will never become reconnected. It is your /// responsibility to remove disconnected clients from the [`Clients`] /// container. pub fn is_disconnected(&self) -> bool { self.send.is_none() } /// Removes an [`Event`] from the event queue. /// /// If there are no remaining events, `None` is returned. /// /// Any remaining client events are deleted at the end of the /// current tick. pub fn pop_event(&mut self) -> Option { self.events.pop_front() } /// The current view distance of this client measured in chunks. pub fn view_distance(&self) -> u8 { self.settings .as_ref() .map_or(2, |s| s.view_distance) .min(self.max_view_distance()) } /// Gets the maximum view distance. The client will not be able to see /// chunks and entities past this distance. /// /// The value returned is measured in chunks. pub fn max_view_distance(&self) -> u8 { self.new_max_view_distance } /// Sets the maximum view distance. The client will not be able to see /// chunks and entities past this distance. /// /// The new view distance is measured in chunks and is clamped to `2..=32`. pub fn set_max_view_distance(&mut self, dist: u8) { self.new_max_view_distance = dist.clamp(2, 32); } /// Enables hardcore mode. This changes the design of the client's hearts. /// /// To have any visible effect, this function must be called on the same /// tick the client joins the server. pub fn set_hardcore(&mut self, hardcore: bool) { self.flags.set_hardcore(hardcore); } /// Gets if hardcore mode is enabled. pub fn is_hardcore(&mut self) -> bool { self.flags.hardcore() } /// Gets the client's current settings. pub fn settings(&self) -> Option<&Settings> { self.settings.as_ref() } /// Disconnects this client from the server with the provided reason. This /// has no effect if the client is already disconnected. /// /// All future calls to [`Self::is_disconnected`] will return `true`. pub fn disconnect(&mut self, reason: impl Into) { if self.send.is_some() { let txt = reason.into(); log::info!("disconnecting client '{}': \"{txt}\"", self.username); self.send_packet(Disconnect { reason: txt }); self.send = None; } } /// Like [`Self::disconnect`], but no reason for the disconnect is /// displayed. pub fn disconnect_no_reason(&mut self) { if self.send.is_some() { log::info!("disconnecting client '{}'", self.username); self.send = None; } } /// Returns an immutable reference to the client's own [`Player`] data. pub fn player(&self) -> &Player { &self.player_data } /// Returns a mutable reference to the client's own [`Player`] data. /// /// Changes made to this data is only visible to this client. pub fn player_mut(&mut self) -> &mut Player { &mut self.player_data } /// Attempts to enqueue a play packet to be sent to this client. The client /// is disconnected if the clientbound packet buffer is full. #[cfg(feature = "protocol")] pub fn send_packet(&mut self, packet: impl Into) { send_packet(&mut self.send, packet); } #[cfg(not(feature = "protocol"))] pub(crate) fn send_packet(&mut self, packet: impl Into) { send_packet(&mut self.send, packet); } pub(crate) fn handle_serverbound_packets(&mut self, entities: &Entities) { self.events.clear(); for _ in 0..self.recv.len() { self.handle_serverbound_packet(entities, self.recv.try_recv().unwrap()); } } fn handle_serverbound_packet(&mut self, entities: &Entities, pkt: C2sPlayPacket) { fn handle_movement_packet( client: &mut Client, _vehicle: bool, new_position: Vec3, new_yaw: f32, new_pitch: f32, new_on_ground: bool, ) { if client.pending_teleports == 0 { // TODO: validate movement using swept AABB collision with the blocks. // TODO: validate that the client is actually inside/outside the vehicle? let event = Event::Movement { position: client.new_position, yaw: client.yaw, pitch: client.pitch, on_ground: client.flags.on_ground(), }; client.new_position = new_position; client.yaw = new_yaw; client.pitch = new_pitch; client.flags.set_on_ground(new_on_ground); client.events.push_back(event); } } match pkt { C2sPlayPacket::AcceptTeleportation(p) => { if self.pending_teleports == 0 { log::warn!("unexpected teleport confirmation from {}", self.username()); self.disconnect_no_reason(); return; } let got = p.teleport_id.0 as u32; let expected = self .teleport_id_counter .wrapping_sub(self.pending_teleports); if got == expected { self.pending_teleports -= 1; } else { log::warn!( "unexpected teleport ID from {} (expected {expected}, got {got})", self.username() ); self.disconnect_no_reason(); } } C2sPlayPacket::BlockEntityTagQuery(_) => {} C2sPlayPacket::ChangeDifficulty(_) => {} C2sPlayPacket::ChatCommand(_) => {} C2sPlayPacket::Chat(p) => self.events.push_back(Event::ChatMessage { message: p.message.0, timestamp: Duration::from_millis(p.timestamp), }), C2sPlayPacket::ChatPreview(_) => {} C2sPlayPacket::ClientCommand(_) => {} C2sPlayPacket::ClientInformation(p) => { let old = self.settings.replace(Settings { locale: p.locale.0, view_distance: p.view_distance.0, chat_mode: p.chat_mode, chat_colors: p.chat_colors, main_hand: p.main_hand, displayed_skin_parts: p.displayed_skin_parts, allow_server_listings: p.allow_server_listings, }); self.events.push_back(Event::SettingsChanged(old)); } C2sPlayPacket::CommandSuggestion(_) => {} C2sPlayPacket::ContainerButtonClick(_) => {} C2sPlayPacket::ContainerClose(_) => {} C2sPlayPacket::CustomPayload(_) => {} C2sPlayPacket::EditBook(_) => {} C2sPlayPacket::EntityTagQuery(_) => {} C2sPlayPacket::Interact(p) => { if let Some(id) = entities.get_with_network_id(p.entity_id.0) { // TODO: verify that the client has line of sight to the targeted entity and // that the distance is <=4 blocks. self.events.push_back(Event::InteractWithEntity { id, sneaking: p.sneaking, kind: match p.kind { InteractKind::Interact(hand) => InteractWithEntityKind::Interact(hand), InteractKind::Attack => InteractWithEntityKind::Attack, InteractKind::InteractAt((target, hand)) => { InteractWithEntityKind::InteractAt { target, hand } } }, }); } } C2sPlayPacket::JigsawGenerate(_) => {} C2sPlayPacket::KeepAlive(p) => { let last_keepalive_id = self.last_keepalive_id; if self.flags.got_keepalive() { log::warn!("unexpected keepalive from player {}", self.username()); self.disconnect_no_reason(); } else if p.id != last_keepalive_id { log::warn!( "keepalive ids for player {} don't match (expected {}, got {})", self.username(), last_keepalive_id, p.id ); self.disconnect_no_reason(); } else { self.flags.set_got_keepalive(true); } } C2sPlayPacket::LockDifficulty(_) => {} C2sPlayPacket::MovePlayerPosition(p) => { handle_movement_packet(self, false, p.position, self.yaw, self.pitch, p.on_ground) } C2sPlayPacket::MovePlayerPositionAndRotation(p) => { handle_movement_packet(self, false, p.position, p.yaw, p.pitch, p.on_ground) } C2sPlayPacket::MovePlayerRotation(p) => { handle_movement_packet(self, false, self.new_position, p.yaw, p.pitch, p.on_ground) } C2sPlayPacket::MovePlayerStatusOnly(p) => handle_movement_packet( self, false, self.new_position, self.yaw, self.pitch, p.on_ground, ), C2sPlayPacket::MoveVehicle(p) => { handle_movement_packet( self, true, p.position, p.yaw, p.pitch, self.flags.on_ground(), ); } C2sPlayPacket::PaddleBoat(p) => { self.events.push_back(Event::SteerBoat { left_paddle_turning: p.left_paddle_turning, right_paddle_turning: p.right_paddle_turning, }); } C2sPlayPacket::PickItem(_) => {} C2sPlayPacket::PlaceRecipe(_) => {} C2sPlayPacket::PlayerAbilities(_) => {} C2sPlayPacket::PlayerAction(p) => { // TODO: verify dug block is within the correct distance from the client. // TODO: verify that the broken block is allowed to be broken? if p.sequence.0 != 0 { self.dug_blocks.push(p.sequence.0); } self.events.push_back(match p.status { DiggingStatus::StartedDigging => Event::Digging { status: event::DiggingStatus::Start, position: p.location, face: p.face, }, DiggingStatus::CancelledDigging => Event::Digging { status: event::DiggingStatus::Cancel, position: p.location, face: p.face, }, DiggingStatus::FinishedDigging => Event::Digging { status: event::DiggingStatus::Finish, position: p.location, face: p.face, }, DiggingStatus::DropItemStack => return, DiggingStatus::DropItem => return, DiggingStatus::ShootArrowOrFinishEating => return, DiggingStatus::SwapItemInHand => return, }); } C2sPlayPacket::PlayerCommand(e) => { // TODO: validate: // - Can't sprint and sneak at the same time // - Can't leave bed while not in a bed. // - Can't jump with a horse if not on a horse // - Can't open horse inventory if not on a horse. // - Can't fly with elytra if not wearing an elytra. self.events.push_back(match e.action_id { PlayerCommandId::StartSneaking => { self.flags.set_sneaking(true); Event::StartSneaking } PlayerCommandId::StopSneaking => { self.flags.set_sneaking(false); Event::StopSneaking } PlayerCommandId::LeaveBed => Event::LeaveBed, PlayerCommandId::StartSprinting => { self.flags.set_sprinting(true); Event::StartSprinting } PlayerCommandId::StopSprinting => { self.flags.set_sprinting(false); Event::StopSprinting } PlayerCommandId::StartJumpWithHorse => { self.flags.set_jumping_with_horse(true); Event::StartJumpWithHorse { jump_boost: e.jump_boost.0 .0 as u8, } } PlayerCommandId::StopJumpWithHorse => { self.flags.set_jumping_with_horse(false); Event::StopJumpWithHorse } PlayerCommandId::OpenHorseInventory => Event::OpenHorseInventory, PlayerCommandId::StartFlyingWithElytra => Event::StartFlyingWithElytra, }); } C2sPlayPacket::PlayerInput(_) => {} C2sPlayPacket::Pong(_) => {} C2sPlayPacket::RecipeBookChangeSettings(_) => {} C2sPlayPacket::RecipeBookSeenRecipe(_) => {} C2sPlayPacket::RenameItem(_) => {} C2sPlayPacket::ResourcePack(_) => {} C2sPlayPacket::SeenAdvancements(_) => {} C2sPlayPacket::SelectTrade(_) => {} C2sPlayPacket::SetBeacon(_) => {} C2sPlayPacket::SetCarriedItem(_) => {} C2sPlayPacket::SetCommandBlock(_) => {} C2sPlayPacket::SetCommandBlockMinecart(_) => {} C2sPlayPacket::SetCreativeModeSlot(_) => {} C2sPlayPacket::SetJigsawBlock(_) => {} C2sPlayPacket::SetStructureBlock(_) => {} C2sPlayPacket::SignUpdate(_) => {} C2sPlayPacket::Swing(p) => self.events.push_back(Event::ArmSwing(p.hand)), C2sPlayPacket::TeleportToEntity(_) => {} C2sPlayPacket::UseItemOn(_) => {} C2sPlayPacket::UseItem(_) => {} } } pub(crate) fn update( &mut self, shared: &SharedServer, entities: &Entities, worlds: &Worlds, ) { // Mark the client as disconnected when appropriate. if self.recv.is_disconnected() || self.send.as_ref().map_or(true, |s| s.is_disconnected()) { self.send = None; return; } let world = match worlds.get(self.world) { Some(world) => world, None => { log::warn!( "client {} is in an invalid world and must be disconnected", self.username() ); self.disconnect_no_reason(); return; } }; let current_tick = shared.current_tick(); // Send the join game packet and other initial packets. We defer this until now // so that the user can set the client's location, game mode, etc. if self.created_tick == current_tick { world .meta .player_list() .initial_packets(|pkt| self.send_packet(pkt)); let mut dimension_names: Vec<_> = shared .dimensions() .map(|(id, _)| ident!("{LIBRARY_NAMESPACE}:dimension_{}", id.0)) .collect(); dimension_names.push(ident!("{LIBRARY_NAMESPACE}:dummy_dimension")); self.send_packet(Login { entity_id: 0, // EntityId 0 is reserved for clients. is_hardcore: self.flags.hardcore(), gamemode: self.new_game_mode, previous_gamemode: self.old_game_mode, dimension_names, registry_codec: Nbt(make_registry_codec(shared)), dimension_type_name: ident!( "{LIBRARY_NAMESPACE}:dimension_type_{}", world.meta.dimension().0 ), dimension_name: ident!( "{LIBRARY_NAMESPACE}:dimension_{}", world.meta.dimension().0 ), hashed_seed: 0, max_players: VarInt(0), view_distance: BoundedInt(VarInt(self.new_max_view_distance as i32)), simulation_distance: VarInt(16), reduced_debug_info: false, enable_respawn_screen: false, is_debug: false, is_flat: world.meta.is_flat(), last_death_location: self .death_location .map(|(id, pos)| (ident!("{LIBRARY_NAMESPACE}:dimension_{}", id.0), pos)), }); self.teleport(self.position(), self.yaw(), self.pitch()); } else { if self.flags.spawn() { self.loaded_entities.clear(); self.loaded_chunks.clear(); // TODO: clear player list. // Client bug workaround: send the client to a dummy dimension first. self.send_packet(Respawn { dimension_type_name: ident!("{LIBRARY_NAMESPACE}:dimension_type_0"), dimension_name: ident!("{LIBRARY_NAMESPACE}:dummy_dimension"), hashed_seed: 0, game_mode: self.game_mode(), previous_game_mode: self.game_mode(), is_debug: false, is_flat: false, copy_metadata: true, last_death_location: None, }); self.send_packet(Respawn { dimension_type_name: ident!( "{LIBRARY_NAMESPACE}:dimension_type_{}", world.meta.dimension().0 ), dimension_name: ident!( "{LIBRARY_NAMESPACE}:dimension_{}", world.meta.dimension().0 ), hashed_seed: 0, game_mode: self.game_mode(), previous_game_mode: self.game_mode(), is_debug: false, is_flat: world.meta.is_flat(), copy_metadata: true, last_death_location: self .death_location .map(|(id, pos)| (ident!("{LIBRARY_NAMESPACE}:dimension_{}", id.0), pos)), }); self.teleport(self.position(), self.yaw(), self.pitch()); } if self.old_game_mode != self.new_game_mode { self.old_game_mode = self.new_game_mode; self.send_packet(GameEvent { reason: GameEventReason::ChangeGameMode, value: self.new_game_mode as i32 as f32, }); } world .meta .player_list() .diff_packets(|pkt| self.send_packet(pkt)); } // Set player attributes if self.flags.attack_speed_modified() { self.flags.set_attack_speed_modified(false); self.send_packet(UpdateAttributes { entity_id: VarInt(0), properties: vec![UpdateAttributesProperty { key: ident!("generic.attack_speed"), value: self.attack_speed, modifiers: Vec::new(), }], }); } if self.flags.movement_speed_modified() { self.flags.set_movement_speed_modified(false); self.send_packet(UpdateAttributes { entity_id: VarInt(0), properties: vec![UpdateAttributesProperty { key: ident!("generic.movement_speed"), value: self.movement_speed, modifiers: Vec::new(), }], }); } // Update the players spawn position (compass position) if self.flags.modified_spawn_position() { self.flags.set_modified_spawn_position(false); self.send_packet(SpawnPosition { location: self.spawn_position, angle: self.spawn_position_yaw, }) } // Update view distance fog on the client if necessary. if self.old_max_view_distance != self.new_max_view_distance { self.old_max_view_distance = self.new_max_view_distance; if self.created_tick != current_tick { self.send_packet(SetChunkCacheRadius { view_distance: BoundedInt(VarInt(self.new_max_view_distance as i32)), }) } } // Check if it's time to send another keepalive. if current_tick % (shared.tick_rate() * 8) == 0 { if self.flags.got_keepalive() { let id = rand::random(); self.send_packet(KeepAlive { id }); self.last_keepalive_id = id; self.flags.set_got_keepalive(false); } else { log::warn!( "player {} timed out (no keepalive response)", self.username() ); self.disconnect_no_reason(); } } let view_dist = self.view_distance(); let center = ChunkPos::at(self.new_position.x, self.new_position.z); // Send the update view position packet if the client changes the chunk section // they're in. { let old_section = self.old_position.map(|n| (n / 16.0).floor() as i32); let new_section = self.new_position.map(|n| (n / 16.0).floor() as i32); if old_section != new_section { self.send_packet(SetChunkCacheCenter { chunk_x: VarInt(new_section.x), chunk_z: VarInt(new_section.z), }) } } let dimension = shared.dimension(world.meta.dimension()); // Update existing chunks and unload those outside the view distance. Chunks // that have been overwritten also need to be unloaded. self.loaded_chunks.retain(|&pos| { // The cache stops chunk data packets from needing to be sent when a player // moves to an adjacent chunk and back to the original. let cache = 2; if let Some(chunk) = world.chunks.get(pos) { if is_chunk_in_view_distance(center, pos, view_dist + cache) && chunk.created_tick() != current_tick { chunk.block_change_packets(pos, dimension.min_y, |pkt| { send_packet(&mut self.send, pkt) }); return true; } } send_packet( &mut self.send, ForgetLevelChunk { chunk_x: pos.x, chunk_z: pos.z, }, ); false }); // Load new chunks within the view distance for pos in chunks_in_view_distance(center, view_dist) { if let Some(chunk) = world.chunks.get(pos) { if self.loaded_chunks.insert(pos) { self.send_packet(chunk.chunk_data_packet(pos)); chunk.block_change_packets(pos, dimension.min_y, |pkt| self.send_packet(pkt)); } } } // Acknowledge broken blocks. for seq in self.dug_blocks.drain(..) { send_packet( &mut self.send, BlockChangeAck { sequence: VarInt(seq), }, ) } // Teleport the player. // // This is done after the chunks are loaded so that the "downloading terrain" // screen is closed at the appropriate time. if self.flags.teleported_this_tick() { self.flags.set_teleported_this_tick(false); self.send_packet(PlayerPosition { position: self.new_position, yaw: self.yaw, pitch: self.pitch, flags: PlayerPositionFlags::new(false, false, false, false, false), teleport_id: VarInt((self.teleport_id_counter - 1) as i32), dismount_vehicle: false, }); } // Send chat messages. for msg in self.msgs_to_send.drain(..) { send_packet( &mut self.send, SystemChat { chat: msg, kind: VarInt(0), }, ); } let mut entities_to_unload = Vec::new(); // Update all entities that are visible and unload entities that are no // longer visible. self.loaded_entities.retain(|&id| { if let Some(entity) = entities.get(id) { debug_assert!(entity.kind() != EntityKind::Marker); if self.new_position.distance(entity.position()) <= view_dist as f64 * 16.0 { if let Some(meta) = entity.updated_metadata_packet(id) { send_packet(&mut self.send, meta); } let position_delta = entity.position() - entity.old_position(); let needs_teleport = position_delta.map(f64::abs).reduce_partial_max() >= 8.0; let flags = entity.flags(); if entity.position() != entity.old_position() && !needs_teleport && flags.yaw_or_pitch_modified() { send_packet( &mut self.send, MoveEntityPositionAndRotation { entity_id: VarInt(id.to_network_id()), delta: (position_delta * 4096.0).as_(), yaw: ByteAngle::from_degrees(entity.yaw()), pitch: ByteAngle::from_degrees(entity.pitch()), on_ground: entity.on_ground(), }, ); } else { if entity.position() != entity.old_position() && !needs_teleport { send_packet( &mut self.send, MoveEntityPosition { entity_id: VarInt(id.to_network_id()), delta: (position_delta * 4096.0).as_(), on_ground: entity.on_ground(), }, ); } if flags.yaw_or_pitch_modified() { send_packet( &mut self.send, MoveEntityRotation { entity_id: VarInt(id.to_network_id()), yaw: ByteAngle::from_degrees(entity.yaw()), pitch: ByteAngle::from_degrees(entity.pitch()), on_ground: entity.on_ground(), }, ); } } if needs_teleport { send_packet( &mut self.send, TeleportEntity { entity_id: VarInt(id.to_network_id()), position: entity.position(), yaw: ByteAngle::from_degrees(entity.yaw()), pitch: ByteAngle::from_degrees(entity.pitch()), on_ground: entity.on_ground(), }, ); } if flags.velocity_modified() { send_packet( &mut self.send, SetEntityMotion { entity_id: VarInt(id.to_network_id()), velocity: velocity_to_packet_units(entity.velocity()), }, ); } if flags.head_yaw_modified() { send_packet( &mut self.send, RotateHead { entity_id: VarInt(id.to_network_id()), head_yaw: ByteAngle::from_degrees(entity.head_yaw()), }, ) } send_entity_events(&mut self.send, id, entity); return true; } } entities_to_unload.push(VarInt(id.to_network_id())); false }); if !entities_to_unload.is_empty() { self.send_packet(RemoveEntities { entities: entities_to_unload, }); } // Update the client's own player metadata. let mut data = Vec::new(); self.player_data.updated_metadata(&mut data); if !data.is_empty() { data.push(0xff); self.send_packet(SetEntityMetadata { entity_id: VarInt(0), metadata: RawBytes(data), }); } self.player_data.clear_modifications(); // Spawn new entities within the view distance. let pos = self.position(); world.spatial_index.query::<_, _, ()>( |bb| bb.projected_point(pos).distance(pos) <= view_dist as f64 * 16.0, |id, _| { let entity = entities .get(id) .expect("entities in spatial index should be valid"); if entity.kind() != EntityKind::Marker && entity.uuid() != self.uuid && self.loaded_entities.insert(id) { self.send_packet( entity .spawn_packet(id) .expect("should not be a marker entity"), ); if let Some(meta) = entity.initial_metadata_packet(id) { self.send_packet(meta); } send_entity_events(&mut self.send, id, entity); } None }, ); for &code in self.player_data.event_codes() { if code <= ENTITY_EVENT_MAX_BOUND as u8 { send_packet( &mut self.send, EntityEvent { entity_id: 0, entity_status: BoundedInt(code), }, ); } // Don't bother sending animations for self since it shouldn't have // any effect. } self.old_position = self.new_position; self.flags.set_spawn(false); } } type SendOpt = Option>; fn send_packet(send_opt: &mut SendOpt, pkt: impl Into) { if let Some(send) = send_opt { match send.try_send(pkt.into()) { Err(TrySendError::Full(_)) => { log::warn!("max outbound packet capacity reached for client"); *send_opt = None; } Err(TrySendError::Disconnected(_)) => { *send_opt = None; } Ok(_) => {} } } } fn send_entity_events(send_opt: &mut SendOpt, id: EntityId, entity: &Entity) { for &code in entity.state.event_codes() { if code <= ENTITY_EVENT_MAX_BOUND as u8 { send_packet( send_opt, EntityEvent { entity_id: id.to_network_id(), entity_status: BoundedInt(code), }, ); } else { send_packet( send_opt, Animate { entity_id: VarInt(id.to_network_id()), animation: BoundedInt(code - ENTITY_EVENT_MAX_BOUND as u8 - 1), }, ) } } } fn make_registry_codec(shared: &SharedServer) -> RegistryCodec { let mut dims = Vec::new(); for (id, dim) in shared.dimensions() { let id = id.0 as i32; dims.push(DimensionTypeRegistryEntry { name: ident!("{LIBRARY_NAMESPACE}:dimension_type_{id}"), id, element: dim.to_dimension_registry_item(), }) } let mut biomes: Vec<_> = shared .biomes() .map(|(id, biome)| biome.to_biome_registry_item(id.0 as i32)) .collect(); // The client needs a biome named "minecraft:plains" in the registry to // connect. This is probably a bug. // // If the issue is resolved, just delete this block. if !biomes.iter().any(|b| b.name == ident!("plains")) { let biome = Biome::default(); assert_eq!(biome.name, ident!("plains")); biomes.push(biome.to_biome_registry_item(biomes.len() as i32)); } RegistryCodec { dimension_type_registry: DimensionTypeRegistry { kind: ident!("dimension_type"), value: dims, }, biome_registry: BiomeRegistry { kind: ident!("worldgen/biome"), value: biomes, }, chat_type_registry: ChatTypeRegistry { kind: ident!("chat_type"), value: vec![ChatTypeRegistryEntry { name: ident!("system"), id: 0, element: ChatType { chat: ChatTypeChat {}, narration: ChatTypeNarration { priority: "system".into(), }, }, }], }, } }