//! Connections to the server after logging in. use std::collections::{HashSet, VecDeque}; use std::iter::FusedIterator; use std::mem; use std::time::Duration; pub 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::data::Player; use crate::entity::{ velocity_to_packet_units, Entities, EntityEvent, EntityId, EntityKind, StatusOrAnimation, }; use crate::player_list::{PlayerListId, PlayerLists}; use crate::player_textures::SignedPlayerTextures; use crate::protocol_inner::packets::c2s::play::{ C2sPlayPacket, DiggingStatus, InteractKind, PlayerCommandId, }; pub use crate::protocol_inner::packets::s2c::play::TitleAnimationTimes; use crate::protocol_inner::packets::s2c::play::{ BiomeRegistry, ChatType, ChatTypeChat, ChatTypeNarration, ChatTypeRegistry, ChatTypeRegistryEntry, ChunkLoadDistance, ChunkRenderDistanceCenter, ClearTitles, DimensionTypeRegistry, DimensionTypeRegistryEntry, Disconnect, EntitiesDestroy, EntityAnimation, EntityAttributes, EntityAttributesProperty, EntityPosition, EntitySetHeadYaw, EntityStatus, EntityTrackerUpdate, EntityVelocityUpdate, GameJoin, GameMessage, GameStateChange, GameStateChangeReason, KeepAlive, MoveRelative, PlayerActionResponse, PlayerPositionLook, PlayerPositionLookFlags, PlayerRespawn, PlayerSpawnPosition, RegistryCodec, Rotate, RotateAndMoveRelative, S2cPlayPacket, UnloadChunk, UpdateSubtitle, UpdateTitle, }; use crate::protocol_inner::{BoundedInt, ByteAngle, Nbt, RawBytes, VarInt}; use crate::server::{C2sPacketChannels, NewClientData, S2cPlayMessage, SharedServer}; use crate::slab_versioned::{Key, VersionedSlab}; use crate::text::Text; use crate::util::{chunks_in_view_distance, is_chunk_in_view_distance}; use crate::world::{WorldId, Worlds}; use crate::{ident, LIBRARY_NAMESPACE}; /// Contains the [`ClientEvent`] enum and related data types. mod event; /// 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 { slab: VersionedSlab>, } impl Clients { pub(crate) fn new() -> Self { Self { slab: VersionedSlab::new(), } } pub(crate) fn insert(&mut self, client: Client) -> (ClientId, &mut Client) { let (k, client) = self.slab.insert(client); (ClientId(k), 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 remove(&mut self, client: ClientId) -> Option { self.slab.remove(client.0).map(|c| c.state) } /// Deletes all clients from the server 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.slab.retain(|k, v| f(ClientId(k), v)) } /// Returns the number of clients on the server. This includes clients /// which may be disconnected. pub fn len(&self) -> usize { self.slab.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.slab.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.slab.get_mut(client.0) } /// Returns an immutable iterator over all clients on the server in an /// unspecified order. pub fn iter( &self, ) -> impl ExactSizeIterator)> + FusedIterator + Clone + '_ { self.slab.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 ExactSizeIterator)> + FusedIterator + '_ { self.slab.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.slab.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.slab.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 possess 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 possess [`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 subtype of the entity base class backed by a remote connection. /// /// In Valence however, clients and players are decoupled. This separation /// allows for greater flexibility and parallelism. pub struct Client { /// Custom state. pub state: C::ClientState, /// Setting this to `None` disconnects the client. send: SendOpt, recv: Receiver, uuid: Uuid, username: String, textures: Option, world: WorldId, old_player_list: Option, new_player_list: Option, position: Vec3, old_position: Vec3, /// Measured in m/s. velocity: Vec3, /// Measured in degrees yaw: f32, /// Measured in degrees pitch: f32, view_distance: u8, /// 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, /// 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, bits: ClientBits, /// The data for the client's own player entity. player_data: Player, entity_events: Vec, } #[bitfield(u16)] struct ClientBits { spawn: bool, flat: bool, 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, velocity_modified: bool, created_this_tick: bool, view_distance_modified: bool, #[bits(5)] _pad: u8, } impl Client { pub(crate) fn new( packet_channels: C2sPacketChannels, ncd: NewClientData, state: C::ClientState, ) -> Self { let (send, recv) = packet_channels; Self { state, send: Some(send), recv, uuid: ncd.uuid, username: ncd.username, textures: ncd.textures, world: WorldId::default(), old_player_list: None, new_player_list: None, position: Vec3::default(), old_position: Vec3::default(), velocity: Vec3::default(), yaw: 0.0, pitch: 0.0, view_distance: 2, 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, 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, bits: ClientBits::new() .with_modified_spawn_position(true) .with_got_keepalive(true) .with_created_this_tick(true), player_data: Player::new(), entity_events: Vec::new(), } } /// If the client joined the game this tick. pub fn created_this_tick(&self) -> bool { self.bits.created_this_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 } pub fn player_list(&self) -> Option<&PlayerListId> { self.new_player_list.as_ref() } pub fn set_player_list(&mut self, id: Option) -> Option { mem::replace(&mut self.new_player_list, id) } /// Sets if this client sees the world as superflat. Superflat worlds have /// a horizon line lower than normal worlds. /// /// The player must be spawned for changes to take effect. pub fn set_flat(&mut self, flat: bool) { self.bits.set_flat(flat); } /// Gets if this client sees the world as superflat. Superflat worlds have /// a horizon line lower than normal worlds. pub fn is_flat(&self) -> bool { self.bits.flat() } /// Changes the world this client is located in and respawns the client. /// This can be used to respawn the client after death. /// /// The given [`WorldId`] must be valid. Otherwise, the client is /// disconnected. pub fn spawn(&mut self, world: WorldId) { self.world = world; self.bits.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.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.position = pos.into(); self.yaw = yaw; self.pitch = pitch; self.bits.set_teleported_this_tick(true); } /// Gets the most recently set velocity of this client in m/s. pub fn velocity(&self) -> Vec3 { self.velocity } /// Sets the client's velocity in m/s. pub fn set_velocity(&mut self, velocity: impl Into>) { self.velocity = velocity.into(); self.bits.set_velocity_modified(true); } /// 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.bits.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(UpdateTitle { text: title }); if !subtitle.is_empty() { self.send_packet(UpdateSubtitle { 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.bits.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.bits.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 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() } pub fn events( &self, ) -> impl DoubleEndedIterator + ExactSizeIterator + FusedIterator + Clone + '_ { self.events.iter() } /// 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() } pub fn push_entity_event(&mut self, event: EntityEvent) { self.entity_events.push(event); } /// The current view distance of this client measured in chunks. The client /// will not be able to see chunks and entities past this distance. /// /// The result is in `2..=32`. pub fn view_distance(&self) -> u8 { self.view_distance } /// Sets the 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_view_distance(&mut self, dist: u8) { let dist = dist.clamp(2, 32); if self.view_distance != dist { self.view_distance = dist; self.bits.set_view_distance_modified(true); } } /// 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.bits.set_hardcore(hardcore); } /// Gets if hardcore mode is enabled. pub fn is_hardcore(&self) -> bool { self.bits.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) { match pkt { C2sPlayPacket::TeleportConfirm(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::QueryBlockNbt(_) => {} C2sPlayPacket::UpdateDifficulty(_) => {} C2sPlayPacket::CommandExecution(_) => {} C2sPlayPacket::ChatMessage(p) => self.events.push_back(ClientEvent::ChatMessage { message: p.message.0, timestamp: Duration::from_millis(p.timestamp), }), C2sPlayPacket::RequestChatPreview(_) => {} C2sPlayPacket::ClientStatus(_) => {} C2sPlayPacket::ClientSettings(p) => { self.events.push_back(ClientEvent::SettingsChanged { 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, }) } C2sPlayPacket::RequestCommandCompletion(_) => {} C2sPlayPacket::ButtonClick(_) => {} C2sPlayPacket::ClickSlot(_) => {} C2sPlayPacket::CloseHandledScreen(_) => {} C2sPlayPacket::CustomPayload(_) => {} C2sPlayPacket::BookUpdate(_) => {} C2sPlayPacket::QueryEntityNbt(_) => {} C2sPlayPacket::PlayerInteractEntity(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(ClientEvent::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.bits.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.bits.set_got_keepalive(true); } } C2sPlayPacket::UpdateDifficultyLock(_) => {} C2sPlayPacket::MovePlayerPosition(p) => { if self.pending_teleports == 0 { self.position = p.position; self.events.push_back(ClientEvent::MovePosition { position: p.position, on_ground: p.on_ground, }); } } C2sPlayPacket::MovePlayerPositionAndRotation(p) => { if self.pending_teleports == 0 { self.position = p.position; self.yaw = p.yaw; self.pitch = p.pitch; self.events.push_back(ClientEvent::MovePositionAndRotation { position: p.position, yaw: p.yaw, pitch: p.pitch, on_ground: p.on_ground, }); } } C2sPlayPacket::MovePlayerRotation(p) => { if self.pending_teleports == 0 { self.yaw = p.yaw; self.pitch = p.pitch; self.events.push_back(ClientEvent::MoveRotation { yaw: p.yaw, pitch: p.pitch, on_ground: p.on_ground, }); } } C2sPlayPacket::MovePlayerOnGround(p) => { if self.pending_teleports == 0 { self.events.push_back(ClientEvent::MoveOnGround { on_ground: p.on_ground, }); } } C2sPlayPacket::MoveVehicle(p) => { if self.pending_teleports == 0 { self.position = p.position; self.yaw = p.yaw; self.pitch = p.pitch; self.events.push_back(ClientEvent::MoveVehicle { position: p.position, yaw: p.yaw, pitch: p.pitch, }); } } C2sPlayPacket::BoatPaddleState(p) => { self.events.push_back(ClientEvent::SteerBoat { left_paddle_turning: p.left_paddle_turning, right_paddle_turning: p.right_paddle_turning, }); } C2sPlayPacket::PickFromInventory(_) => {} C2sPlayPacket::CraftRequest(_) => {} C2sPlayPacket::UpdatePlayerAbilities(_) => {} 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 => ClientEvent::Digging { status: event::DiggingStatus::Start, position: p.location, face: p.face, }, DiggingStatus::CancelledDigging => ClientEvent::Digging { status: event::DiggingStatus::Cancel, position: p.location, face: p.face, }, DiggingStatus::FinishedDigging => ClientEvent::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(c) => { self.events.push_back(match c.action_id { PlayerCommandId::StartSneaking => ClientEvent::StartSneaking, PlayerCommandId::StopSneaking => ClientEvent::StopSneaking, PlayerCommandId::LeaveBed => ClientEvent::LeaveBed, PlayerCommandId::StartSprinting => ClientEvent::StartSprinting, PlayerCommandId::StopSprinting => ClientEvent::StopSprinting, PlayerCommandId::StartJumpWithHorse => ClientEvent::StartJumpWithHorse { jump_boost: c.jump_boost.0 .0 as u8, }, PlayerCommandId::StopJumpWithHorse => ClientEvent::StopJumpWithHorse, PlayerCommandId::OpenHorseInventory => ClientEvent::OpenHorseInventory, PlayerCommandId::StartFlyingWithElytra => ClientEvent::StartFlyingWithElytra, }); } C2sPlayPacket::PlayerInput(_) => {} C2sPlayPacket::PlayPong(_) => {} C2sPlayPacket::RecipeBookChangeSettings(_) => {} C2sPlayPacket::RecipeBookSeenRecipe(_) => {} C2sPlayPacket::RenameItem(_) => {} C2sPlayPacket::ResourcePackStatus(_) => {} C2sPlayPacket::AdvancementTab(_) => {} C2sPlayPacket::SelectMerchantTrade(_) => {} C2sPlayPacket::UpdateBeacon(_) => {} C2sPlayPacket::UpdateSelectedSlot(_) => {} C2sPlayPacket::UpdateCommandBlock(_) => {} C2sPlayPacket::UpdateCommandBlockMinecart(_) => {} C2sPlayPacket::UpdateCreativeModeSlot(_) => {} C2sPlayPacket::UpdateJigsaw(_) => {} C2sPlayPacket::UpdateStructureBlock(_) => {} C2sPlayPacket::UpdateSign(_) => {} C2sPlayPacket::HandSwing(p) => self.events.push_back(ClientEvent::ArmSwing(p.hand)), C2sPlayPacket::SpectatorTeleport(_) => {} C2sPlayPacket::PlayerInteractBlock(_) => {} C2sPlayPacket::PlayerInteractItem(_) => {} } } pub(crate) fn update( &mut self, shared: &SharedServer, entities: &Entities, worlds: &Worlds, player_lists: &PlayerLists, ) { // 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 initial location, game mode, etc. if self.created_this_tick() { self.bits.set_spawn(false); if let Some(id) = &self.new_player_list { player_lists .get(id) .initial_packets(|p| send_packet(&mut self.send, p)); } 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(GameJoin { entity_id: 0, // EntityId 0 is reserved for clients. is_hardcore: self.bits.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.view_distance() as i32)), simulation_distance: VarInt(16), reduced_debug_info: false, enable_respawn_screen: false, is_debug: false, is_flat: self.bits.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.bits.spawn() { self.bits.set_spawn(false); self.loaded_entities.clear(); self.loaded_chunks.clear(); // Client bug workaround: send the client to a dummy dimension first. // TODO: is there actually a bug? self.send_packet(PlayerRespawn { 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: self.bits.flat(), copy_metadata: true, last_death_location: None, }); self.send_packet(PlayerRespawn { 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: self.bits.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()); } // Update game mode if self.old_game_mode != self.new_game_mode { self.old_game_mode = self.new_game_mode; self.send_packet(GameStateChange { reason: GameStateChangeReason::ChangeGameMode, value: self.new_game_mode as i32 as f32, }); } // If the player list was changed... if self.old_player_list != self.new_player_list { // Delete existing entries from old player list. if let Some(id) = &self.old_player_list { player_lists .get(id) .clear_packets(|p| send_packet(&mut self.send, p)); } // Get initial packets for new player list. if let Some(id) = &self.new_player_list { player_lists .get(id) .initial_packets(|p| send_packet(&mut self.send, p)); } self.old_player_list = self.new_player_list.clone(); } else if let Some(id) = &self.new_player_list { // Update current player list. player_lists .get(id) .update_packets(|p| send_packet(&mut self.send, p)); } } // Set player attributes if self.bits.attack_speed_modified() { self.bits.set_attack_speed_modified(false); self.send_packet(EntityAttributes { entity_id: VarInt(0), properties: vec![EntityAttributesProperty { key: ident!("generic.attack_speed"), value: self.attack_speed, modifiers: Vec::new(), }], }); } if self.bits.movement_speed_modified() { self.bits.set_movement_speed_modified(false); self.send_packet(EntityAttributes { entity_id: VarInt(0), properties: vec![EntityAttributesProperty { key: ident!("generic.movement_speed"), value: self.movement_speed, modifiers: Vec::new(), }], }); } // Update the players spawn position (compass position) if self.bits.modified_spawn_position() { self.bits.set_modified_spawn_position(false); self.send_packet(PlayerSpawnPosition { location: self.spawn_position, angle: self.spawn_position_yaw, }) } // Update view distance fog on the client. if self.bits.view_distance_modified() { self.bits.set_view_distance_modified(false); if !self.created_this_tick() { self.send_packet(ChunkLoadDistance { view_distance: BoundedInt(VarInt(self.view_distance() as i32)), }); } } // Check if it's time to send another keepalive. if current_tick % (shared.tick_rate() * 8) == 0 { if self.bits.got_keepalive() { let id = rand::random(); self.send_packet(KeepAlive { id }); self.last_keepalive_id = id; self.bits.set_got_keepalive(false); } else { log::warn!( "player {} timed out (no keepalive response)", self.username() ); self.disconnect_no_reason(); } } let center = ChunkPos::at(self.position.x, self.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.position.map(|n| (n / 16.0).floor() as i32); if old_section != new_section { self.send_packet(ChunkRenderDistanceCenter { 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, self.view_distance + cache) && !chunk.created_this_tick() { chunk.block_change_packets(pos, dimension.min_y, |pkt| { send_packet(&mut self.send, pkt) }); return true; } } send_packet( &mut self.send, UnloadChunk { chunk_x: pos.x, chunk_z: pos.z, }, ); false }); // Load new chunks within the view distance for pos in chunks_in_view_distance(center, self.view_distance) { 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, PlayerActionResponse { 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.bits.teleported_this_tick() { self.bits.set_teleported_this_tick(false); self.send_packet(PlayerPositionLook { position: self.position, yaw: self.yaw, pitch: self.pitch, flags: PlayerPositionLookFlags::new(false, false, false, false, false), teleport_id: VarInt(self.teleport_id_counter as i32), dismount_vehicle: false, }); self.pending_teleports = self.pending_teleports.wrapping_add(1); if self.pending_teleports == 0 { 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); } // Set velocity. Do this after teleporting since teleporting sets velocity to // zero. if self.bits.velocity_modified() { self.bits.set_velocity_modified(false); self.send_packet(EntityVelocityUpdate { entity_id: VarInt(0), velocity: velocity_to_packet_units(self.velocity), }); } // Send chat messages. for msg in self.msgs_to_send.drain(..) { send_packet( &mut self.send, GameMessage { 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.position.distance(entity.position()) <= self.view_distance as f64 * 16.0 { if let Some(meta) = entity.updated_tracked_data_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.bits(); if entity.position() != entity.old_position() && !needs_teleport && flags.yaw_or_pitch_modified() { send_packet( &mut self.send, RotateAndMoveRelative { 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, MoveRelative { 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, Rotate { 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, EntityPosition { 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, EntityVelocityUpdate { entity_id: VarInt(id.to_network_id()), velocity: velocity_to_packet_units(entity.velocity()), }, ); } if flags.head_yaw_modified() { send_packet( &mut self.send, EntitySetHeadYaw { entity_id: VarInt(id.to_network_id()), head_yaw: ByteAngle::from_degrees(entity.head_yaw()), }, ) } send_entity_events(&mut self.send, id.to_network_id(), entity.events()); return true; } } entities_to_unload.push(VarInt(id.to_network_id())); false }); if !entities_to_unload.is_empty() { self.send_packet(EntitiesDestroy { entities: entities_to_unload, }); } // Update the client's own player metadata. let mut data = Vec::new(); self.player_data.updated_tracked_data(&mut data); if !data.is_empty() { data.push(0xff); self.send_packet(EntityTrackerUpdate { entity_id: VarInt(0), metadata: RawBytes(data), }); } // Spawn new entities within the view distance. let pos = self.position(); let view_dist = self.view_distance; world.spatial_index.query::<_, _, ()>( |bb| bb.projected_point(pos).distance(pos) <= view_dist as f64 * 16.0, |id, _| { let entity = entities .get(id) .expect("entity IDs in spatial index should be valid at this point"); 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_tracked_data_packet(id) { self.send_packet(meta); } send_entity_events(&mut self.send, id.to_network_id(), entity.events()); } None }, ); send_entity_events(&mut self.send, 0, &self.entity_events); self.entity_events.clear(); self.player_data.clear_modifications(); self.old_position = self.position; self.bits.set_created_this_tick(false); send_packet(&mut self.send, S2cPlayMessage::Flush); } } 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, entity_id: i32, events: &[EntityEvent]) { for &event in events { match event.status_or_animation() { StatusOrAnimation::Status(code) => send_packet( send_opt, EntityStatus { entity_id, entity_status: code, }, ), StatusOrAnimation::Animation(code) => send_packet( send_opt, EntityAnimation { entity_id: VarInt(entity_id), animation: code, }, ), } } } 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(), }, }, }], }, } }