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use crate::network::{Network, ServerToWorkerMessage};
use crate::task::RunningTasks;
use crate::{BlockUpdateEvent, EntityDespawnEvent, Name, PlayerLeaveEvent};
use ahash::AHashMap;
use bumpalo::Bump;
use feather_core::anvil::level::LevelData;
use feather_core::blocks::BlockId;
use feather_core::chunk_map::ChunkMap;
use feather_core::network::Packet;
use feather_core::util::{BlockPosition, ChunkPosition, Position};
use feather_server_config::Config;
use fecs::{Entity, Event, EventHandlers, IntoQuery, OwnedResources, Read, RefResources, World};
use rand::rngs::SmallRng;
use rand::{Rng, SeedableRng};
use smallvec::SmallVec;
use std::cell::{RefCell, RefMut};
use std::fmt::Display;
use std::ops::{Deref, DerefMut};
use std::sync::atomic::{AtomicU32, Ordering};
use std::sync::Arc;
use thread_local::CachedThreadLocal;
/// The `Game` resource, which acts as a central bus to bind together
/// the feather-server-* crates. Resources which are accessed frequently,
/// such as the chunk map, are stored in here.
pub struct Game {
pub chunk_map: ChunkMap,
/// Number of ticks since the program started. Can be used
/// to make a system which only runs at a fixed interval.
pub tick_count: u64,
/// Stores entities which have a hold on chunks,
/// preventing the chunk from being unloaded.
pub chunk_holders: ChunkHolders,
/// The server configuration.
pub config: Arc<Config>,
/// The level data.
pub level: LevelData,
/// Associates chunks with the entities that reside in them. Used
/// as an acceleration structure for spacial lookups.
pub chunk_entities: ChunkEntities,
/// World time, in the Minecraft way.
pub time: Time,
/// Server task manager, which allows executing futures
/// which will not be interrupted on shutdown.
pub running_tasks: RunningTasks,
/// The event handler map.
pub event_handlers: Arc<EventHandlers>,
/// Resources other than `Game`, used to run event handlers.
pub resources: Arc<OwnedResources>,
/// General-purpose, non-cryptographic random number generator
pub rng: CachedThreadLocal<RefCell<SmallRng>>,
/// Shared bump allocator, reset each tick.
pub bump: CachedThreadLocal<Bump>,
/// The server player count.
pub player_count: Arc<AtomicU32>,
}
impl Game {
/// Handles an event or message. All handlers
/// for the given event will be run.
pub fn handle(&mut self, world: &mut World, event: impl Event) {
// TODO: optimize this by avoiding Rc clone.
let resources = Arc::clone(&self.resources);
let event_handlers = Arc::clone(&self.event_handlers);
let resources = RefResources::new(Arc::as_ref(&resources), (self,));
event_handlers.trigger(&resources, world, event);
}
/// Retrieves the block at the given position,
/// or `None` if the block's chunk is not loaded.
pub fn block_at(&self, pos: BlockPosition) -> Option<BlockId> {
self.chunk_map.block_at(pos)
}
/// Sets the block at the given position.
///
/// If the block's chunk's is not loaded, returns `false`;
/// otherwise, returns `true`.
pub fn set_block_at(&mut self, world: &mut World, pos: BlockPosition, block: BlockId) -> bool {
let old = match self.block_at(pos) {
Some(block) => block,
None => return false,
};
let result = self.chunk_map.set_block_at(pos, block);
self.handle(
world,
BlockUpdateEvent {
pos,
old,
new: block,
},
);
result
}
/// Returns a bump allocator.
pub fn bump(&self) -> &Bump {
self.bump.get_or_default()
}
/// Returns a random number generator.
pub fn rng(&self) -> RefMut<impl Rng> {
self.rng
.get_or(|| RefCell::new(SmallRng::from_entropy()))
.borrow_mut()
}
/// Despawns an entity. This should be used instead of `World::despawn`
/// as it properly handles events.
pub fn despawn(&mut self, entity: Entity, world: &mut World) {
self.handle(world, EntityDespawnEvent { entity });
world.despawn(entity);
}
/// Disconnects a player.
pub fn disconnect(&mut self, player: Entity, world: &mut World, reason: impl Display) {
let network = world.get::<Network>(player);
let name = world.get::<Name>(player);
log::info!("{} disconnected: {}", name.0, reason);
let _ = network.tx.send(ServerToWorkerMessage::Disconnect);
drop(name);
drop(network);
self.player_count.fetch_sub(1, Ordering::AcqRel);
self.handle(world, PlayerLeaveEvent { player });
self.despawn(player, world);
}
/* BROADCAST FUNCTIONS */
/// Broadcasts a packet to all online players.
pub fn broadcast_global(&self, world: &World, packet: impl Packet, neq: Option<Entity>) {
self.broadcast_global_boxed(world, Box::new(packet), neq);
}
/// Broadcasts a boxed packet to all online players.
pub fn broadcast_global_boxed(
&self,
world: &World,
packet: Box<dyn Packet>,
neq: Option<Entity>,
) {
for (entity, network) in <Read<Network>>::query().iter_entities(world.inner()) {
if neq.map(|neq| neq == entity).unwrap_or(false) {
continue;
}
network.send_boxed(packet.box_clone());
}
}
/// Broadcasts a packet to all players able to see a given chunk.
pub fn broadcast_chunk_update(
&self,
world: &World,
packet: impl Packet,
chunk: ChunkPosition,
neq: Option<Entity>,
) {
self.broadcast_chunk_update_boxed(world, Box::new(packet), chunk, neq);
}
/// Broadcasts a boxed packet to all players able to see a given chunk.
pub fn broadcast_chunk_update_boxed(
&self,
world: &World,
packet: Box<dyn Packet>,
chunk: ChunkPosition,
neq: Option<Entity>,
) {
// we can use the chunk holders structure to accelerate this
for entity in self.chunk_holders.holders_for(chunk) {
if neq.map(|neq| neq == *entity).unwrap_or(false) {
continue;
}
if let Some(network) = world.try_get::<Network>(*entity) {
network.send_boxed(packet.box_clone());
}
}
}
/// Broadcasts a packet to all players able to see a given entity.
pub fn broadcast_entity_update(
&self,
world: &World,
packet: impl Packet,
entity: Entity,
neq: Option<Entity>,
) {
self.broadcast_entity_update_boxed(world, Box::new(packet), entity, neq);
}
/// Broadcasts a boxed packet to all players able to see a given entity.
pub fn broadcast_entity_update_boxed(
&self,
world: &World,
packet: Box<dyn Packet>,
entity: Entity,
neq: Option<Entity>,
) {
// Send the packet to all players who have a hold on the entity's chunk.
let entity_chunk = world.get::<Position>(entity).chunk();
self.broadcast_chunk_update_boxed(world, packet, entity_chunk, neq);
}
}
/// The chunk holder map contains a mapping
/// of chunk positions to any number of entities, called "holders."
/// When a chunk position has no holders, it will be queued
/// for unloading.
///
/// In addition, the chunk holders map can be used to select
/// which players to broadcast an entity movement to: a player
/// who has a chunk hold on the entity's chunk would be able to see
/// the movement, while other players would be outside of the view
/// distance. This technique allows for higher performance and
/// avoids constant nearby entity queries.
#[derive(Default, Clone, Debug)]
pub struct ChunkHolders {
pub inner: AHashMap<ChunkPosition, SmallVec<[Entity; 4]>>,
}
impl ChunkHolders {
pub fn holders_for(&self, chunk: ChunkPosition) -> &[Entity] {
self.inner
.get(&chunk)
.map(SmallVec::as_slice)
.unwrap_or(&[])
}
pub fn chunk_has_holders(&self, chunk: ChunkPosition) -> bool {
let holders = self.holders_for(chunk);
!holders.is_empty()
}
pub fn insert_holder(&mut self, chunk: ChunkPosition, holder: Entity) {
self.inner.entry(chunk).or_default().push(holder)
}
}
/// Stores which entities belong to every given chunk.
///
/// This data structure can be used to accelerate certain
/// operations, such as querying for entities
/// within some distance of a position. In addition,
/// it can be used to send all entities in a chunk
/// to a player.
///
/// Do note that the information in this structure is not necessarily up to date,
/// although a best effort is made to update the data.
#[derive(Default)]
pub struct ChunkEntities(pub AHashMap<ChunkPosition, SmallVec<[Entity; 4]>>);
impl ChunkEntities {
pub fn new() -> Self {
Self::default()
}
/// Returns a slice of entities in the given chunk.
pub fn entities_in_chunk(&self, chunk: ChunkPosition) -> &[Entity] {
self.0.get(&chunk).map(|vec| vec.as_slice()).unwrap_or(&[])
}
}
/// The current time of the world.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct Time(pub u64);
impl Deref for Time {
type Target = u64;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for Time {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl Time {
/// Returns the time of day. This is calculated
/// as `time.0 % 24_000`.
pub fn time_of_day(self) -> u64 {
self.0 % 24_000
}
/// Returns the age of the world in ticks. Equivalent to `time.0`.
pub fn world_age(self) -> u64 {
self.0
}
}
#[fecs::system]
pub fn reset_bump_allocators(game: &mut Game) {
game.bump.iter_mut().for_each(Bump::reset);
}
#[fecs::system]
pub fn increment_tick_count(game: &mut Game) {
game.tick_count += 1;
}
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