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+use std::collections::{VecDeque, HashMap}; +use anyhow::Result; +use anyhow::{bail, Context}; +use tracing::{info, debug, instrument, Level}; +use tracing_subscriber::{fmt, Registry, EnvFilter}; +use tracing_subscriber::prelude::*; +use tracing_subscriber::fmt::format::FmtSpan; +use tokio::runtime::Handle; + +struct Service { + t: Transport, +} + +#[derive(Debug)] +struct Event { + id: usize, + in_reply_to: Option, +} + +type CB = dyn (FnMut(Event, &mut Transport) -> Result<()>) + Send; + +enum Handler { + Callback(Box), + Channel(oneshot::Sender) +} + +struct Transport { + msg_id: usize, + outbox: Sender, + inbox: Receiver>, + callbacks: HashMap, +} + + +impl Transport { + fn new() -> (Self, Sender>, Receiver) { + let (itx, irx) = channel::>(1); + let (otx, orx) = channel::(1); + (Self { + msg_id: 0, + outbox: otx, + inbox: irx, + callbacks: Default::default(), + }, itx, orx) + + } + + #[instrument(level="debug",skip(self),ret)] + fn close(&mut self) -> Result<()> { + self.inbox.close(); + Ok(()) + } + + #[instrument(level="debug",skip(self),ret)] + async fn send(&mut self, e: Event) -> Result<()> { + self.outbox.send(e).await.context("unable to send message") + } + #[instrument(level="debug",skip(self),ret)] + async fn rpc(&mut self, e: Event) -> Result { + let id = e.id; + self.send(e).await?; + let (tx, rx) = oneshot::channel(); + self.callbacks.insert(id, Handler::Channel(tx)); + let resp = rx.await?; + Ok(resp) + } + + async fn rpc_callback Result<()> + Send + Sized + 'static>(&mut self, e: Event, cb: C) -> Result<()> { + self.callbacks.insert(e.id, Handler::Callback(Box::new(cb))); + self.send(e).await + } + + #[instrument(level="debug",skip(self),ret)] + async fn recv(&mut self) -> Result> { + loop { + let Some(nxt) = self.inbox.recv().await else { + return Ok(None); + }; + let Some(nxt) = nxt else { + return Ok(None); + }; + let Some(original) = nxt.in_reply_to else { + return Ok(Some(nxt)); + }; + match self.callbacks.remove(&nxt.id) { + None => { + return Ok(Some(nxt)); + }, + Some(Handler::Callback(mut cb)) => { + cb(nxt, self)?; + }, + Some(Handler::Channel(c)) => { + if let Err(e) = c.send(nxt) { + bail!("could not send event to callback") + } + } + } + } + } +} + +impl Service { + #[instrument(level="debug", skip(self),ret)] + async fn process(&mut self, event: Event) -> Result<()>{ + let resp = self.t.rpc(Event{id: event.id, in_reply_to: None}).await?; + debug!("{:?}", &resp); + Ok(()) + } + + #[instrument(level="debug", skip(self),ret)] + async fn process_nonblocking(&mut self, event: Event) -> Result<()>{ + let resp = self.t.rpc_callback(Event{id: event.id, in_reply_to: None}, + |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 + }) + }) + } + ).await?; + debug!("{:?}", &resp); + Ok(()) + } + + #[instrument(level="debug", skip(self),ret)] + async fn serve(mut self) -> Result<()>{ + while let Some(e) = self.t.recv().await? { + self.process_nonblocking(e).await?; + } + Ok::<(), anyhow::Error>(()) + } + +} + +#[tokio::main] +async fn main() -> Result<()> { + tracing_subscriber::registry() + .with(fmt::layer()) + .with(EnvFilter::from_default_env()) + .init(); + + let (t, tx, mut rx) = Transport::new(); + + let mut serv = Service{t}; + + let tx1 = tx.clone(); + let s = tokio::spawn(async move { + for i in 0..2 { + debug!("Sending event {i}"); + tx1.send(Some(Event{id: i, in_reply_to: None})).await.context("could not send original message")?; + } + Ok::<(), anyhow::Error>(()) + }); + debug!("Serving"); + let r = tokio::spawn(async move { + for i in 0..5 { + let Some(msg) = rx.recv().await else { + break; + }; + if msg.in_reply_to.is_some() { + continue; + } + sleep(Duration::from_millis(1000)).await; + let reply = Event{id: 99, in_reply_to: Some(msg.id)}; + debug!("Sending reply: {:?}", &reply); + tx.send(Some(reply)).await.context("could not send reply")?; + } + println!("DONE WITH REPLIES"); + sleep(Duration::from_millis(5000)).await; + println!("REALLY DONE WITH REPLIES"); + tx.send(None).await.context("could not send closing message")?; + Ok(()) + }); + serv.serve().await?; + + debug!("Served"); + //serv.close(); + s.await.context("error joining")??; + r.await.context("error joining send")? +}