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use crate::{ heartbeat::Heartbeat, socket_state::{SocketEvent, SocketStateHandle}, tcp::TcpStream, thread::ThreadHandle, Result, }; use log::trace; use mio::{Events, Interest, Poll, Token, Waker}; use std::{ collections::HashMap, fmt, sync::{ atomic::{AtomicBool, AtomicUsize, Ordering}, Arc, }, thread::Builder as ThreadBuilder, }; pub type Slot = usize; pub trait ReactorBuilder: fmt::Debug + Send + Sync { fn build(&self, heartbeat: Heartbeat) -> Result<Box<dyn Reactor + Send>>; } pub trait Reactor: fmt::Debug + Send { fn register(&mut self, socket: &mut TcpStream, socket_state: SocketStateHandle) -> Result<Slot>; fn handle(&self) -> Box<dyn ReactorHandle + Send> { Box::new(DummyHandle) } #[allow(clippy::boxed_local)] fn start(self: Box<Self>) -> Result<ThreadHandle> { Ok(ThreadHandle::default()) } } pub trait ReactorHandle { fn shutdown(&self) -> Result<()> { Ok(()) } fn start_heartbeat(&self) {} fn poll_read(&self, _slot: Slot) {} fn poll_write(&self, _slot: Slot) {} } pub(crate) struct DefaultReactorBuilder; impl ReactorBuilder for DefaultReactorBuilder { fn build(&self, heartbeat: Heartbeat) -> Result<Box<dyn Reactor + Send>> { Ok(Box::new(DefaultReactor::new(heartbeat)?)) } } pub(crate) struct DefaultReactor { slot: AtomicUsize, poll: Poll, heartbeat: Heartbeat, slots: HashMap<Token, SocketStateHandle>, handle: DefaultReactorHandle, } #[derive(Clone)] pub(crate) struct DefaultReactorHandle { run: Arc<AtomicBool>, waker: Arc<Waker>, } impl Reactor for DefaultReactor { fn handle(&self) -> Box<dyn ReactorHandle + Send> { Box::new(self.handle.clone()) } fn register( &mut self, socket: &mut TcpStream, socket_state: SocketStateHandle, ) -> Result<usize> { let token = Token(self.slot.fetch_add(1, Ordering::SeqCst)); self.poll .registry() .register(socket, token, Interest::READABLE | Interest::WRITABLE)?; self.slots.insert(token, socket_state); Ok(token.0) } fn start(mut self: Box<Self>) -> Result<ThreadHandle> { Ok(ThreadHandle::new( ThreadBuilder::new() .name("lapin-reactor".into()) .spawn(move || { let mut events = Events::with_capacity(16); while self.should_run() { self.run(&mut events)?; } Ok(()) })?, )) } } impl DefaultReactor { fn new(heartbeat: Heartbeat) -> Result<Self> { let poll = Poll::new()?; let handle = DefaultReactorHandle { run: Arc::new(AtomicBool::new(true)), waker: Arc::new(Waker::new(poll.registry(), Token(0))?), }; Ok(Self { slot: AtomicUsize::new(1), poll, heartbeat, slots: HashMap::default(), handle, }) } fn should_run(&self) -> bool { self.handle.run.load(Ordering::SeqCst) } fn run(&mut self, events: &mut Events) -> Result<()> { trace!("reactor poll"); self.poll.poll(events, self.heartbeat.poll_timeout()?)?; trace!("reactor poll done"); for event in events.iter() { if let Some(socket) = self.slots.get(&event.token()) { if event.is_error() { socket.send(SocketEvent::Error); } if event.is_read_closed() || event.is_write_closed() { socket.send(SocketEvent::Closed); } if event.is_readable() { socket.send(SocketEvent::Readable); } if event.is_writable() { socket.send(SocketEvent::Writable); } } } Ok(()) } } impl ReactorHandle for DefaultReactorHandle { fn shutdown(&self) -> Result<()> { self.run.store(false, Ordering::SeqCst); self.waker.wake()?; Ok(()) } } impl fmt::Debug for DefaultReactorBuilder { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("DefaultReactorBuilder").finish() } } impl fmt::Debug for DefaultReactor { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("DefaultReactor").finish() } } #[derive(Clone)] struct DummyHandle; impl ReactorHandle for DummyHandle {}