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Copy pathregion_worker.rs
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165 lines (145 loc) · 4.99 KB
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use std::{
collections::hash_map::Entry,
path::PathBuf,
time::{Duration, Instant},
};
use ahash::AHashMap;
use base::anvil::{
self,
region::{RegionHandle, RegionPosition},
};
use flume::{Receiver, Sender};
use crate::chunk::worker::{ChunkLoadResult, LoadRequest, LoadedChunk, SaveRequest, WorkerRequest};
/// Duration to keep a region file open when not in use.
const CACHE_TIME: Duration = Duration::from_secs(60);
struct OpenRegionFile {
handle: RegionHandle,
last_used: Instant,
}
impl OpenRegionFile {
pub fn new(handle: RegionHandle) -> Self {
Self {
handle,
last_used: Instant::now(),
}
}
pub fn should_close(&self) -> bool {
self.last_used.elapsed() >= CACHE_TIME
}
}
pub struct RegionWorker {
request_receiver: Receiver<WorkerRequest>,
result_sender: Sender<ChunkLoadResult>,
world_dir: PathBuf,
region_files: AHashMap<RegionPosition, OpenRegionFile>,
last_cache_update: Instant,
}
impl RegionWorker {
pub fn new(
world_dir: PathBuf,
request_receiver: Receiver<WorkerRequest>,
) -> (Self, Receiver<ChunkLoadResult>) {
let (result_sender, result_receiver) = flume::bounded(256);
(
Self {
request_receiver,
result_sender,
world_dir,
region_files: AHashMap::new(),
last_cache_update: Instant::now(),
},
result_receiver,
)
}
pub fn start(self) {
std::thread::Builder::new()
.name("chunk_worker".to_owned())
.spawn(move || self.run())
.expect("failed to create chunk worker thread");
}
fn run(mut self) {
log::info!("Chunk worker started");
loop {
match self.request_receiver.recv_timeout(CACHE_TIME) {
Ok(req) => match req {
WorkerRequest::Load(load) => self.load_chunk(load),
WorkerRequest::Save(save) => self.save_chunk(save).unwrap(),
},
Err(flume::RecvTimeoutError::Timeout) => (),
Err(flume::RecvTimeoutError::Disconnected) => {
log::info!("Chunk worker shutting down");
return;
}
}
self.update_cache();
}
}
fn save_chunk(&mut self, req: SaveRequest) -> anyhow::Result<()> {
let reg_pos = RegionPosition::from_chunk(req.pos);
let handle = &mut match self.region_file_handle(reg_pos) {
Some(h) => h,
None => {
let new_handle = anvil::region::create_region(&self.world_dir, reg_pos)?;
self.region_files
.insert(reg_pos, OpenRegionFile::new(new_handle));
self.region_file_handle(reg_pos).unwrap()
}
}
.handle;
handle.save_chunk(
&req.chunk.read(),
&req.entities[..],
&req.block_entities[..],
)?;
Ok(())
}
fn load_chunk(&mut self, req: LoadRequest) {
let result = self.get_chunk_load_result(req);
let _ = self.result_sender.send(result);
}
fn get_chunk_load_result(&mut self, req: LoadRequest) -> ChunkLoadResult {
let pos = req.pos;
let region = RegionPosition::from_chunk(pos);
let file = match self.region_file_handle(region) {
Some(file) => file,
None => return ChunkLoadResult::Missing(pos),
};
let chunk = match file.handle.load_chunk(pos) {
Ok((chunk, _, _)) => chunk,
Err(e) => match e {
anvil::region::Error::ChunkNotExist => return ChunkLoadResult::Missing(pos),
err => return ChunkLoadResult::Error(err.into()),
},
};
file.last_used = Instant::now();
ChunkLoadResult::Loaded(LoadedChunk { pos, chunk })
}
fn region_file_handle(&mut self, region: RegionPosition) -> Option<&mut OpenRegionFile> {
match self.region_files.entry(region) {
Entry::Occupied(e) => Some(e.into_mut()),
Entry::Vacant(e) => {
let handle = base::anvil::region::load_region(&self.world_dir, region);
if let Ok(handle) = handle {
Some(e.insert(OpenRegionFile::new(handle)))
} else {
None
}
}
}
}
fn update_cache(&mut self) {
if self.last_cache_update.elapsed() >= CACHE_TIME {
let initial_len = self.region_files.len();
self.region_files.retain(|_, file| !file.should_close());
self.last_cache_update = Instant::now();
let num_closed = initial_len - self.region_files.len();
if num_closed != 0 {
log::debug!(
"Closed {} region files ({} still open)",
num_closed,
self.region_files.len()
);
}
}
}
}