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use std::{ future::Future, marker::PhantomData, pin::Pin, }; use serde; use tokio::task; use crate::internal::base::*; pub struct SharedSession<S> where S : SharedProtocol, { executor : Box< dyn FnOnce( Receiver<(SenderOnce<()>, SenderOnce<S>)>, ) -> Pin<Box<dyn Future<Output = ()> + Send>> + Send, >, } pub struct SharedChannel<S> where S : SharedProtocol, { endpoint : Sender<(SenderOnce<()>, SenderOnce<S>)>, } #[derive(serde::Serialize, serde::Deserialize)] pub struct SerializedSharedChannel<S> where S : SharedProtocol, { acquire_sender : IpcSender<()>, acquire_receiver : IpcReceiver<()>, linear_sender : OpaqueSender, linear_receiver : OpaqueReceiver, phantom : PhantomData<S>, } impl<S> Clone for SerializedSharedChannel<S> where S : SharedProtocol, { fn clone(&self) -> Self { SerializedSharedChannel { acquire_sender : self.acquire_sender.clone(), acquire_receiver : self.acquire_receiver.clone(), linear_sender : self.linear_sender.clone(), linear_receiver : self.linear_receiver.clone(), phantom : PhantomData, } } } impl<S> Clone for SharedChannel<S> where S : SharedProtocol, { fn clone(&self) -> Self { SharedChannel { endpoint : self.endpoint.clone(), } } } pub async fn unsafe_run_shared_session<S>( session : SharedSession<S>, receiver : Receiver<(SenderOnce<()>, SenderOnce<S>)>, ) where S : SharedProtocol, { (session.executor)(receiver).await; } pub fn unsafe_create_shared_session<S, Fut>( executor1 : impl FnOnce(Receiver<(SenderOnce<()>, SenderOnce<S>)>) -> Fut + Send + 'static ) -> SharedSession<S> where S : SharedProtocol, Fut : Future<Output = ()> + Send, { let executor : Box< dyn FnOnce( Receiver<(SenderOnce<()>, SenderOnce<S>)>, ) -> Pin<Box<dyn Future<Output = ()> + Send>> + Send, > = Box::new(move |sender| { Box::pin(async { executor1(sender).await; }) }); SharedSession { executor } } pub fn unsafe_create_shared_channel<S>( ) -> (SharedChannel<S>, Receiver<(SenderOnce<()>, SenderOnce<S>)>) where S : SharedProtocol, { let (sender, receiver) = unbounded(); (SharedChannel { endpoint : sender }, receiver) } pub fn unsafe_receive_shared_channel<S>( session : SharedChannel<S> ) -> (ReceiverOnce<()>, ReceiverOnce<S>) where S : SharedProtocol, { let (sender1, receiver1) = once_channel::<()>(); let (sender2, receiver2) = once_channel::<S>(); session.endpoint.send((sender1, sender2)).unwrap(); (receiver1, receiver2) } impl<A> serde::Serialize for SharedChannel<A> where A : SharedProtocol + ForwardChannel, { fn serialize<S>( &self, serializer : S, ) -> Result<S::Ok, S::Error> where S : serde::Serializer, { serialize_shared_channel(self.clone()).serialize(serializer) } } impl<'a, A> serde::Deserialize<'a> for SharedChannel<A> where A : SharedProtocol + ForwardChannel, { fn deserialize<D>(deserializer : D) -> Result<Self, D::Error> where D : serde::Deserializer<'a>, { let channel = <SerializedSharedChannel<A>>::deserialize(deserializer)?; Ok(deserialize_shared_channel(channel)) } } fn serialize_shared_channel<S>( channel : SharedChannel<S> ) -> SerializedSharedChannel<S> where S : SharedProtocol + ForwardChannel, { let (sender1, receiver1) = ipc_channel::<()>(); let (sender2, receiver2) = ipc_channel::<()>(); let (sender3, receiver3) = opaque_channel(); let (sender4, receiver4) = opaque_channel(); task::spawn(async move { loop { let receiver1 = receiver1.clone(); let signal = task::spawn_blocking(move || receiver1.recv()) .await .unwrap(); match signal { Some(()) => { let (sender5, receiver5) = once_channel::<()>(); let (sender6, receiver6) = once_channel::<S>(); { let channel = channel.clone(); let sender2 = sender2.clone(); let receiver3 = receiver3.clone(); let sender4 = sender4.clone(); debug!("[serialize_shared_channel] acquiring local shared channel"); channel.endpoint.send((sender5, sender6)).unwrap(); receiver5.recv().await.unwrap(); debug!("[serialize_shared_channel] acquired local shared channel"); sender2.send(()); receiver6.forward_to(sender4, receiver3); } } None => break, } } }); SerializedSharedChannel { acquire_sender : sender1, acquire_receiver : receiver2, linear_sender : sender3, linear_receiver : receiver4, phantom : PhantomData, } } fn deserialize_shared_channel<S>( channel : SerializedSharedChannel<S> ) -> SharedChannel<S> where S : SharedProtocol + ForwardChannel + Send, { let (sender1, receiver1) = unbounded::<(SenderOnce<()>, SenderOnce<S>)>(); task::spawn(async move { loop { match receiver1.recv().await { Some((sender2, sender3)) => { debug!( "[deserialize_shared_channel] acquiring remote shared channel" ); channel.acquire_sender.send(()); let acquire_receiver = channel.acquire_receiver.clone(); task::spawn_blocking(move || { acquire_receiver.recv().unwrap(); }) .await .unwrap(); debug!("[deserialize_shared_channel] acquired remote shared channel"); sender2.send(()).unwrap(); let channel2 = channel.clone(); sender3.forward_to(channel2.linear_sender, channel2.linear_receiver); } None => break, } } }); SharedChannel { endpoint : sender1 } }