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use lapin::{executor::Executor, ConnectionProperties, Result}; use std::{future::Future, pin::Pin}; use tokio::runtime::Handle; pub trait LapinTokioExt { fn with_tokio(self) -> Self where Self: Sized, { let this = self.with_tokio_executor(); #[cfg(unix)] let this = this.with_tokio_reactor(); this } fn with_tokio_executor(self) -> Self where Self: Sized; #[cfg(unix)] fn with_tokio_reactor(self) -> Self where Self: Sized; } impl LapinTokioExt for ConnectionProperties { fn with_tokio_executor(self) -> Self { self.with_executor(TokioExecutor(Handle::current())) } #[cfg(unix)] fn with_tokio_reactor(self) -> Self { self.with_reactor(unix::TokioReactorBuilder::new(Handle::current())) } } #[derive(Debug)] struct TokioExecutor(Handle); impl Executor for TokioExecutor { fn spawn(&self, f: Pin<Box<dyn Future<Output = ()> + Send>>) -> Result<()> { self.0.spawn(f); Ok(()) } } #[cfg(unix)] mod unix { use super::*; use lapin::{ heartbeat::Heartbeat, reactor::{Reactor, ReactorBuilder, ReactorHandle, Slot}, socket_state::{SocketEvent, SocketStateHandle}, tcp::{TcpStream, TcpStreamWrapper}, }; use parking_lot::Mutex; use std::{collections::HashMap, fmt, sync::Arc}; use tokio::{io::unix::AsyncFd, time::sleep}; #[derive(Debug)] pub(crate) struct TokioReactorBuilder { executor: Arc<dyn Executor>, handle: Handle, } impl TokioReactorBuilder { pub(crate) fn new(handle: Handle) -> Self { Self { executor: Arc::new(TokioExecutor(handle.clone())), handle, } } } #[derive(Debug)] struct TokioReactor(TokioReactorHandle); #[derive(Clone)] struct TokioReactorHandle { heartbeat: Heartbeat, executor: Arc<dyn Executor>, handle: Handle, inner: Arc<Mutex<Inner>>, } #[derive(Default)] struct Inner { slot: Slot, slots: HashMap<Slot, (Arc<AsyncFd<TcpStreamWrapper>>, SocketStateHandle)>, } impl fmt::Debug for TokioReactorHandle { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("TokioReactorHandle").finish() } } impl Inner { fn register( &mut self, socket: Arc<AsyncFd<TcpStreamWrapper>>, socket_state: SocketStateHandle, ) -> Result<usize> { let slot = self.slot; self.slot += 1; self.slots.insert(slot, (socket, socket_state)); Ok(slot) } } impl ReactorBuilder for TokioReactorBuilder { fn build(&self, heartbeat: Heartbeat) -> Result<Box<dyn Reactor + Send>> { Ok(Box::new(TokioReactor(TokioReactorHandle { heartbeat, executor: self.executor.clone(), handle: self.handle.clone(), inner: Arc::new(Mutex::new(Default::default())), }))) } } impl Reactor for TokioReactor { fn register( &mut self, socket: &mut TcpStream, socket_state: SocketStateHandle, ) -> Result<Slot> { let _enter = self.0.handle.enter(); let socket = Arc::new(AsyncFd::new(unsafe { TcpStreamWrapper::new(socket) })?); let slot = self.0.inner.lock().register(socket, socket_state)?; self.0.poll_read(slot); self.0.poll_write(slot); Ok(slot) } fn handle(&self) -> Box<dyn ReactorHandle + Send> { Box::new(self.0.clone()) } } impl ReactorHandle for TokioReactorHandle { fn start_heartbeat(&self) { self.executor .spawn(Box::pin(heartbeat(self.heartbeat.clone()))) .expect("start_heartbeat"); } fn poll_read(&self, slot: usize) { if let Some((socket, socket_state)) = self.inner.lock().slots.get(&slot) { self.executor .spawn(Box::pin(poll_read(socket.clone(), socket_state.clone()))) .expect("poll_read"); } } fn poll_write(&self, slot: usize) { if let Some((socket, socket_state)) = self.inner.lock().slots.get(&slot) { self.executor .spawn(Box::pin(poll_write(socket.clone(), socket_state.clone()))) .expect("poll_write"); } } } async fn heartbeat(heartbeat: Heartbeat) { while let Ok(Some(timeout)) = heartbeat.poll_timeout() { sleep(timeout).await; } } async fn poll_read(socket: Arc<AsyncFd<TcpStreamWrapper>>, socket_state: SocketStateHandle) { socket.readable().await.unwrap().clear_ready(); socket_state.send(SocketEvent::Readable); } async fn poll_write(socket: Arc<AsyncFd<TcpStreamWrapper>>, socket_state: SocketStateHandle) { socket.writable().await.unwrap().clear_ready(); socket_state.send(SocketEvent::Writable); } }