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	rust prototype for a maelstrom server
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							| @@ -0,0 +1,339 @@ | |||||||
|  | # This file is automatically @generated by Cargo. | ||||||
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							| @@ -0,0 +1,7 @@ | |||||||
|  | [package] | ||||||
|  | name = "asyncfnstore" | ||||||
|  | version = "0.1.0" | ||||||
|  | edition = "2021" | ||||||
|  |  | ||||||
|  | [dependencies] | ||||||
|  | tokio = { version = "1.43.0", features = ["full"] } | ||||||
							
								
								
									
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							| @@ -0,0 +1,55 @@ | |||||||
|  | //use futures::future::BoxFuture; | ||||||
|  | use std::future::Future; | ||||||
|  | use std::pin::Pin; | ||||||
|  |  | ||||||
|  |  | ||||||
|  | struct Data { | ||||||
|  |     num: usize | ||||||
|  | } | ||||||
|  |  | ||||||
|  | async fn bar(data: &Data) -> usize { | ||||||
|  |     data.num + 666 | ||||||
|  | } | ||||||
|  |  | ||||||
|  | async fn lorem(data: &Data) -> usize { | ||||||
|  |     data.num + 777 | ||||||
|  | } | ||||||
|  |  | ||||||
|  | type BoxFuture<'a, T> = Box<dyn Future<Output = T> + 'a>; | ||||||
|  | type CallbackDyn = dyn for<'a> Fn(&'a Data) -> BoxFuture<'a, usize>; | ||||||
|  |  | ||||||
|  | struct Foo { | ||||||
|  |     one: Box<CallbackDyn>, | ||||||
|  |     data: Data, | ||||||
|  | } | ||||||
|  |  | ||||||
|  | impl Foo { | ||||||
|  |     fn set<F>(&mut self, f: F)  | ||||||
|  |         where F: for<'a> Fn(&'a Data) -> BoxFuture<'a, usize> + 'static { | ||||||
|  |         self.one = Box::new(f); | ||||||
|  |     } | ||||||
|  |  | ||||||
|  |     async fn process(mut self) { | ||||||
|  |         let func = &self.one; | ||||||
|  |         println!("Result: {}", Box::into_pin(func(&self.data)).await); | ||||||
|  |     } | ||||||
|  | } | ||||||
|  |  | ||||||
|  | #[tokio::main] | ||||||
|  | async fn main() {     | ||||||
|  |     let mut foo = Foo { | ||||||
|  |         one: Box::new(|i| Box::new(bar(i))), | ||||||
|  |         data: Data{num: 3}, | ||||||
|  |     }; | ||||||
|  |     //let mut foo = Foo::new(bar); | ||||||
|  |     let offset = 5; | ||||||
|  |     foo.set(move |d| { | ||||||
|  |         Box::new(async move { | ||||||
|  |             let i = lorem(d).await; | ||||||
|  |             i + offset | ||||||
|  |         }) | ||||||
|  |     }); | ||||||
|  |  | ||||||
|  |     foo.process().await; | ||||||
|  |      | ||||||
|  | } | ||||||
| @@ -1,18 +1,18 @@ | |||||||
| use tokio::{ | use tokio::{ | ||||||
|     task, |     task, | ||||||
|     time::{Duration, sleep}, |     time::{Instant, Duration, sleep}, | ||||||
|     sync::{oneshot, |     sync::{oneshot, | ||||||
|            mpsc::{Receiver, Sender, channel} |            mpsc::{Receiver, Sender, channel} | ||||||
|     } |     } | ||||||
| }; | }; | ||||||
| use std::collections::{VecDeque, HashMap}; | use std::collections::{HashMap}; | ||||||
| use anyhow::Result; | use anyhow::Result; | ||||||
| use anyhow::{bail, Context}; | use anyhow::{bail, Context}; | ||||||
| use tracing::{info, debug, instrument, Level}; | use tracing::{info, debug, instrument}; | ||||||
| use tracing_subscriber::{fmt, Registry, EnvFilter}; | use tracing_subscriber::{fmt, EnvFilter}; | ||||||
| use tracing_subscriber::prelude::*; | use tracing_subscriber::prelude::*; | ||||||
| use tracing_subscriber::fmt::format::FmtSpan; | use std::future::Future; | ||||||
| use tokio::runtime::Handle; |  | ||||||
|  |  | ||||||
| struct Service { | struct Service { | ||||||
|     t: Transport, |     t: Transport, | ||||||
| @@ -24,10 +24,15 @@ struct Event { | |||||||
|     in_reply_to: Option<usize>, |     in_reply_to: Option<usize>, | ||||||
| } | } | ||||||
|  |  | ||||||
| type CB = dyn (FnMut(Event, &mut Transport) -> Result<()>) + Send; | //type CB<'a> = Box<dyn Fn(Event, &'a mut Transport) -> Box<dyn Future<Output = Result<()>>>>; | ||||||
|  |  | ||||||
|  | //type CB<'a> = dyn Fn(Event, &mut Transport) -> BoxFuture<'a, Result<()>>; | ||||||
|  |  | ||||||
|  | type BoxFuture<'a, T> = Box<dyn Future<Output = T> + 'a>; | ||||||
|  | type CallbackDyn = dyn for<'a> Fn(Event, &'a mut Transport) -> BoxFuture<'a, Result<()>>; | ||||||
|  |  | ||||||
| enum Handler { | enum Handler { | ||||||
|     Callback(Box<CB>), |     Callback(Box<CallbackDyn>), | ||||||
|     Channel(oneshot::Sender<Event>) |     Channel(oneshot::Sender<Event>) | ||||||
| } | } | ||||||
|  |  | ||||||
| @@ -35,7 +40,7 @@ struct Transport { | |||||||
|     msg_id: usize, |     msg_id: usize, | ||||||
|     outbox: Sender<Event>, |     outbox: Sender<Event>, | ||||||
|     inbox: Receiver<Option<Event>>, |     inbox: Receiver<Option<Event>>, | ||||||
|     callbacks: HashMap<usize, Handler>, |     callbacks: HashMap<usize, (Handler, Instant)>, | ||||||
| } | } | ||||||
|  |  | ||||||
|  |  | ||||||
| @@ -55,28 +60,45 @@ impl Transport { | |||||||
|     #[instrument(level="debug",skip(self),ret)] |     #[instrument(level="debug",skip(self),ret)] | ||||||
|     fn close(&mut self) -> Result<()> { |     fn close(&mut self) -> Result<()> { | ||||||
|         self.inbox.close(); |         self.inbox.close(); | ||||||
|  |         let i = Instant::now(); | ||||||
|  |         self.callbacks.retain(|_, (_, t)| *t >= i); | ||||||
|  |         if self.callbacks.is_empty() { | ||||||
|             Ok(()) |             Ok(()) | ||||||
|  |         } else { | ||||||
|  |             bail!("some callbacks failed to launch.") | ||||||
|  |         } | ||||||
|     } |     } | ||||||
|  |  | ||||||
|     #[instrument(level="debug",skip(self),ret)] |     #[instrument(level="debug",skip(self),ret)] | ||||||
|     async fn send(&mut self, e: Event) -> Result<()> { |     async fn send(&self, e: Event) -> Result<()> { | ||||||
|         self.outbox.send(e).await.context("unable to send message") |         self.outbox.send(e).await.context("unable to send message") | ||||||
|     } |     } | ||||||
|  |  | ||||||
|     #[instrument(level="debug",skip(self),ret)] |     #[instrument(level="debug",skip(self),ret)] | ||||||
|     async fn rpc(&mut self, e: Event) -> Result<Event> { |     async fn rpc(&mut self, e: Event) -> Result<Event> { | ||||||
|         let id = e.id; |         let rx = self.rpc_chan(e).await?; | ||||||
|         self.send(e).await?; |  | ||||||
|         let (tx, rx) = oneshot::channel(); |  | ||||||
|         self.callbacks.insert(id, Handler::Channel(tx)); |  | ||||||
|         let resp = rx.await?; |         let resp = rx.await?; | ||||||
|         Ok(resp) |         Ok(resp) | ||||||
|     } |     } | ||||||
|  |  | ||||||
|     async fn rpc_callback<C: FnMut(Event, &mut Transport) -> Result<()> + Send + Sized + 'static>(&mut self, e: Event, cb: C) -> Result<()> { |     #[instrument(level="debug",skip(self),ret)] | ||||||
|         self.callbacks.insert(e.id, Handler::Callback(Box::new(cb))); |     async fn rpc_chan(&mut self, e: Event) -> Result<oneshot::Receiver<Event>> { | ||||||
|  |         let id = e.id; | ||||||
|  |         self.send(e).await?; | ||||||
|  |         let (tx, rx) = oneshot::channel(); | ||||||
|  |         self.callbacks.insert(id, (Handler::Channel(tx), Instant::now() + Duration::from_millis(1000))); | ||||||
|  |         Ok(rx) | ||||||
|  |     } | ||||||
|  |  | ||||||
|  |     async fn rpc_callback<C>(&mut self, e: Event, cb: C) -> Result<()> | ||||||
|  |         where | ||||||
|  |         C: for<'a> Fn(Event, &'a mut Transport) -> BoxFuture<'a, Result<()>> + 'static | ||||||
|  |     { | ||||||
|  |         self.callbacks.insert(e.id, (Handler::Callback(Box::new(cb)), (Instant::now() + Duration::from_millis(1000)))); | ||||||
|         self.send(e).await |         self.send(e).await | ||||||
|     } |     } | ||||||
|  |  | ||||||
|  |     /// #Cancellation safety: This method is **not** cancellation safe, because it deals with callbacks | ||||||
|     #[instrument(level="debug",skip(self),ret)] |     #[instrument(level="debug",skip(self),ret)] | ||||||
|     async fn recv(&mut self) -> Result<Option<Event>> { |     async fn recv(&mut self) -> Result<Option<Event>> { | ||||||
|         loop { |         loop { | ||||||
| @@ -89,16 +111,25 @@ impl Transport { | |||||||
|             let Some(original) = nxt.in_reply_to else { |             let Some(original) = nxt.in_reply_to else { | ||||||
|                 return Ok(Some(nxt)); |                 return Ok(Some(nxt)); | ||||||
|             }; |             }; | ||||||
|             match self.callbacks.remove(&nxt.id) { |             let sp = match self.callbacks.remove(&original) { | ||||||
|                 None => { |                 None => { | ||||||
|                     return Ok(Some(nxt)); |                     return Ok(Some(nxt)); | ||||||
|                 }, |                 }, | ||||||
|                 Some(Handler::Callback(mut cb)) => { |                 Some((h, t)) => { | ||||||
|                     cb(nxt, self)?; |                     if t < Instant::now() { | ||||||
|  |                         continue; | ||||||
|  |                     } | ||||||
|  |                     h | ||||||
|  |                 } | ||||||
|  |             }; | ||||||
|  |             match sp { | ||||||
|  |                 Handler::Callback(cb) => { | ||||||
|  |                     let f = Box::into_pin(cb(nxt, self)); | ||||||
|  |                     f.await?; | ||||||
|                 }, |                 }, | ||||||
|                 Some(Handler::Channel(c)) => { |                 Handler::Channel(c) => { | ||||||
|                     if let Err(e) = c.send(nxt) { |                     if let Err(e) = c.send(nxt) { | ||||||
|                         bail!("could not send event to callback") |                         bail!("could not send event to callback {e:?}") | ||||||
|                     } |                     } | ||||||
|                 } |                 } | ||||||
|             } |             } | ||||||
| @@ -106,6 +137,17 @@ impl Transport { | |||||||
|     } |     } | ||||||
| } | } | ||||||
|  |  | ||||||
|  | macro_rules! callback { | ||||||
|  |     (|$e:ident, $svc:ident| $blk:block) => { | ||||||
|  |         |$e, $svc| { | ||||||
|  |             Box::new(async move { | ||||||
|  |                 $blk | ||||||
|  |             }) | ||||||
|  |         } | ||||||
|  |     } | ||||||
|  |  | ||||||
|  | } | ||||||
|  |  | ||||||
| impl Service { | impl Service { | ||||||
|     #[instrument(level="debug", skip(self),ret)] |     #[instrument(level="debug", skip(self),ret)] | ||||||
|     async fn process(&mut self, event: Event) -> Result<()>{ |     async fn process(&mut self, event: Event) -> Result<()>{ | ||||||
| @@ -117,16 +159,9 @@ impl Service { | |||||||
|     #[instrument(level="debug", skip(self),ret)] |     #[instrument(level="debug", skip(self),ret)] | ||||||
|     async fn process_nonblocking(&mut self, event: Event) -> Result<()>{ |     async fn process_nonblocking(&mut self, event: Event) -> Result<()>{ | ||||||
|         let resp = self.t.rpc_callback(Event{id: event.id, in_reply_to: None}, |         let resp = self.t.rpc_callback(Event{id: event.id, in_reply_to: None}, | ||||||
|                                        |e, svc| { |                                        callback!(|e, svc| { | ||||||
|                                            let handle = Handle::current(); |  | ||||||
|                                            task::block_in_place(move || { |  | ||||||
|                                                handle.block_on( |  | ||||||
|                                                    async move { |  | ||||||
|                                                svc.send(Event{id: 199, in_reply_to: Some(e.id)}).await |                                                svc.send(Event{id: 199, in_reply_to: Some(e.id)}).await | ||||||
|                                                    }) |                                            })).await?; | ||||||
|                                            }) |  | ||||||
|                                        } |  | ||||||
|                                        ).await?; |  | ||||||
|         debug!("{:?}", &resp); |         debug!("{:?}", &resp); | ||||||
|         Ok(()) |         Ok(()) | ||||||
|     } |     } | ||||||
| @@ -136,7 +171,7 @@ impl Service { | |||||||
|         while let Some(e) = self.t.recv().await? { |         while let Some(e) = self.t.recv().await? { | ||||||
|             self.process_nonblocking(e).await?; |             self.process_nonblocking(e).await?; | ||||||
|         } |         } | ||||||
|         Ok::<(), anyhow::Error>(()) |         self.t.close() | ||||||
|     } |     } | ||||||
|  |  | ||||||
| } | } | ||||||
| @@ -148,9 +183,11 @@ async fn main() -> Result<()> { | |||||||
|     .with(EnvFilter::from_default_env()) |     .with(EnvFilter::from_default_env()) | ||||||
|     .init(); |     .init(); | ||||||
|  |  | ||||||
|  |     info!("Starting example server"); | ||||||
|  |  | ||||||
|     let (t, tx, mut rx) = Transport::new(); |     let (t, tx, mut rx) = Transport::new(); | ||||||
|  |  | ||||||
|     let mut serv = Service{t}; |     let serv = Service{t}; | ||||||
|  |  | ||||||
|     let tx1 = tx.clone(); |     let tx1 = tx.clone(); | ||||||
|     let s = tokio::spawn(async move { |     let s = tokio::spawn(async move { | ||||||
| @@ -162,28 +199,29 @@ async fn main() -> Result<()> { | |||||||
|     }); |     }); | ||||||
|     debug!("Serving"); |     debug!("Serving"); | ||||||
|     let r = tokio::spawn(async move { |     let r = tokio::spawn(async move { | ||||||
|         for i in 0..5 { |         for i in 0..2 { | ||||||
|             let Some(msg) = rx.recv().await else { |             let Some(msg) = rx.recv().await else { | ||||||
|                 break; |                 break; | ||||||
|             }; |             }; | ||||||
|             if msg.in_reply_to.is_some() { |             if msg.in_reply_to.is_some() { | ||||||
|                 continue; |                 continue; | ||||||
|             } |             } | ||||||
|             sleep(Duration::from_millis(1000)).await; |             sleep(Duration::from_millis(200)).await; | ||||||
|  |             if i < 0 { | ||||||
|                 let reply = Event{id: 99, in_reply_to: Some(msg.id)}; |                 let reply = Event{id: 99, in_reply_to: Some(msg.id)}; | ||||||
|                 debug!("Sending reply: {:?}", &reply); |                 debug!("Sending reply: {:?}", &reply); | ||||||
|                 tx.send(Some(reply)).await.context("could not send reply")?; |                 tx.send(Some(reply)).await.context("could not send reply")?; | ||||||
|         } |             } else { | ||||||
|                 println!("DONE WITH REPLIES"); |                 println!("DONE WITH REPLIES"); | ||||||
|         sleep(Duration::from_millis(5000)).await; |             } | ||||||
|         println!("REALLY DONE WITH REPLIES"); |         } | ||||||
|  |         sleep(Duration::from_millis(100)).await; | ||||||
|         tx.send(None).await.context("could not send closing message")?; |         tx.send(None).await.context("could not send closing message")?; | ||||||
|         Ok(()) |         Ok(()) | ||||||
|     }); |     }); | ||||||
|     serv.serve().await?; |     serv.serve().await?; | ||||||
|  |  | ||||||
|     debug!("Served"); |     info!("Served"); | ||||||
|     //serv.close(); |  | ||||||
|     s.await.context("error joining")??; |     s.await.context("error joining")??; | ||||||
|     r.await.context("error joining send")? |     r.await.context("error joining send")? | ||||||
| } | } | ||||||
|   | |||||||
		Reference in New Issue
	
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