.drone.yml

@@ -1,17 +1,28 @@
----
 kind: pipeline
 name: default
 
+workspace:
+  base: /drone
+
+clone:
+  disable: true
+
 steps:
+  - name: clone
+    image: alpine/git
+    commands:
+      - mkdir -p cargo
+      - git clone $DRONE_GIT_HTTP_URL
+      - cd netapp
+      - git checkout $DRONE_COMMIT
+
   - name: style
     image: rust:1.58-buster
     environment:
       CARGO_HOME: /drone/cargo
-    volumes:
-      - name: cargo
-        path: /drone/cargo
     commands:
       - rustup component add rustfmt clippy
+      - cd netapp
       - cargo fmt -- --check
       - cargo clippy --all-features -- --deny warnings
       - cargo clippy --example fullmesh -- --deny warnings
@@ -21,13 +32,11 @@ steps:
     image: rust:1.58-buster
     environment:
       CARGO_HOME: /drone/cargo
-    volumes:
-      - name: cargo
-        path: /drone/cargo
     commands:
       - apt-get update
       - apt-get install --yes libsodium-dev
       - cargo install -f cargo-all-features
+      - cd netapp
       - cargo build-all-features
       - cargo build --example fullmesh
       - cargo build --example basalt --features "basalt"
@@ -36,19 +45,8 @@ steps:
     image: rust:1.58-buster
     environment:
       CARGO_HOME: /drone/cargo
-    volumes:
-      - name: cargo
-        path: /drone/cargo
     commands:
       - apt-get update
       - apt-get install --yes libsodium-dev
+      - cd netapp
       - cargo test --all-features -- --test-threads 1
-
-volumes:
-  - name: cargo
-    temp: {}
----
-kind: signature
-hmac: f0d1a9e8d85a22c1d9084b4d90c9930be9700da52284f1875ece996cc52a6ce9
-
-...

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "netapp"
-version = "0.10.0"
+version = "0.4.4"
 authors = ["Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license-file = "LICENSE"
@@ -16,28 +16,28 @@ name = "netapp"
 
 [features]
 default = []
-basalt = ["lru"]
+basalt = ["lru", "rand"]
-telemetry = ["opentelemetry", "opentelemetry-contrib"]
+telemetry = ["opentelemetry", "opentelemetry-contrib", "rand"]
 
 [dependencies]
 futures = "0.3.17"
 pin-project = "1.0.10"
 tokio = { version = "1.0", default-features = false, features = ["net", "rt", "rt-multi-thread", "sync", "time", "macros", "io-util", "signal"] }
-tokio-util = { version = "0.7", default-features = false, features = ["compat", "io"] }
+tokio-util = { version = "0.6.8", default-features = false, features = ["compat"] }
 tokio-stream = "0.1.7"
 
-serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }
+serde = { version = "1.0", default-features = false, features = ["derive"] }
-rmp-serde = "1.1"
+rmp-serde = "0.14.3"
 hex = "0.4.2"
 
-rand = { version = "0.8" }
+rand = { version = "0.5.5", optional = true }
 
 log = "0.4.8"
 arc-swap = "1.1"
 async-trait = "0.1.7"
-err-derive = "0.3"
+err-derive = "0.2.3"
-bytes = "1.2"
+bytes = "0.6.0"
-lru = { version = "0.7", optional = true }
+lru = { version = "0.6", optional = true }
 cfg-if = "1.0"
 
 sodiumoxide = { version = "0.2.5-0", package = "kuska-sodiumoxide" }
@@ -47,7 +47,8 @@ opentelemetry = { version = "0.17", optional = true }
 opentelemetry-contrib = { version = "0.9", optional = true }
 
 [dev-dependencies]
-env_logger = "0.9"
+env_logger = "0.8"
+pretty_env_logger = "0.4"
 structopt = { version = "0.3", default-features = false }
 chrono = "0.4"
 

Makefile

@@ -1,6 +1,5 @@
 all:
-	#cargo build --all-features
+	cargo build --all-features
-	cargo build
 	cargo build --example fullmesh
 	cargo build --all-features --example basalt
 	RUST_LOG=netapp=trace,fullmesh=trace cargo run --example fullmesh -- -n 3242ce79e05e8b6a0e43441fbd140a906e13f335f298ae3a52f29784abbab500 -p 6c304114a0e1018bbe60502a34d33f4f439f370856c3333dda2726da01eb93a4894b7ef7249a71f11d342b69702f1beb7c93ec95fbcf122ad1eca583bb0629e7

examples/basalt.rs

@@ -14,8 +14,8 @@ use sodiumoxide::crypto::sign::ed25519;
 use tokio::sync::watch;
 
 use netapp::endpoint::*;
-use netapp::message::*;
 use netapp::peering::basalt::*;
+use netapp::proto::*;
 use netapp::util::parse_peer_addr;
 use netapp::{NetApp, NodeID};
 
@@ -145,7 +145,7 @@ impl Example {
 				tokio::spawn(async move {
 					match self2
 						.example_endpoint
-						.call(&p, ExampleMessage { example_field: 42 }, PRIO_NORMAL)
+						.call(&p, &ExampleMessage { example_field: 42 }, PRIO_NORMAL)
 						.await
 					{
 						Ok(resp) => debug!("Got example response: {:?}", resp),

examples/fullmesh.rs

@@ -1,24 +1,16 @@
 use std::io::Write;
 use std::net::SocketAddr;
-use std::sync::Arc;
-use std::time::Duration;
 
-use async_trait::async_trait;
+use log::info;
-use bytes::Bytes;
+
-use futures::{stream, StreamExt};
-use log::*;
-use serde::{Deserialize, Serialize};
 use structopt::StructOpt;
-use tokio::sync::watch;
 
 use sodiumoxide::crypto::auth;
 use sodiumoxide::crypto::sign::ed25519;
 
-use netapp::endpoint::*;
-use netapp::message::*;
 use netapp::peering::fullmesh::*;
 use netapp::util::*;
-use netapp::{NetApp, NodeID};
+use netapp::NetApp;
 
 #[derive(StructOpt, Debug)]
 #[structopt(name = "netapp")]
@@ -72,7 +64,7 @@ async fn main() {
 	};
 
 	info!("Node private key: {}", hex::encode(&privkey));
-	info!("Node public key: {}", hex::encode(privkey.public_key()));
+	info!("Node public key: {}", hex::encode(&privkey.public_key()));
 
 	let public_addr = opt.public_addr.map(|x| x.parse().unwrap());
 	let listen_addr: SocketAddr = opt.listen_addr.parse().unwrap();
@@ -94,126 +86,13 @@ async fn main() {
 
 	info!("Add more peers to this mesh by running: fullmesh -n {} -l 127.0.0.1:$((1000 + $RANDOM)) -b {}@{}",
 		hex::encode(&netid),
-		hex::encode(privkey.public_key()),
+		hex::encode(&privkey.public_key()),
 		listen_addr);
 
 	let watch_cancel = netapp::util::watch_ctrl_c();
 
-	let example = Arc::new(Example {
-		netapp: netapp.clone(),
-		fullmesh: peering.clone(),
-		example_endpoint: netapp.endpoint("__netapp/examples/fullmesh.rs/Example".into()),
-	});
-	example.example_endpoint.set_handler(example.clone());
-
 	tokio::join!(
-		example.exchange_loop(watch_cancel.clone()),
 		netapp.listen(listen_addr, public_addr, watch_cancel.clone()),
 		peering.run(watch_cancel),
 	);
 }
-
-// ----
-
-struct Example {
-	netapp: Arc<NetApp>,
-	fullmesh: Arc<FullMeshPeeringStrategy>,
-	example_endpoint: Arc<Endpoint<ExampleMessage, Self>>,
-}
-
-impl Example {
-	async fn exchange_loop(self: Arc<Self>, must_exit: watch::Receiver<bool>) {
-		let mut i = 12000;
-		while !*must_exit.borrow() {
-			tokio::time::sleep(Duration::from_secs(2)).await;
-
-			let peers = self.fullmesh.get_peer_list();
-			for p in peers.iter() {
-				let id = p.id;
-				if id == self.netapp.id {
-					continue;
-				}
-				i += 1;
-				let example_field = i;
-				let self2 = self.clone();
-				tokio::spawn(async move {
-					info!(
-						"Send example query {} to {}",
-						example_field,
-						hex::encode(id)
-					);
-					// Fake data stream with some delays in item production
-					let stream =
-						Box::pin(stream::iter([100, 200, 300, 400]).then(|x| async move {
-							tokio::time::sleep(Duration::from_millis(500)).await;
-							Ok(Bytes::from(vec![(x % 256) as u8; 133 * x]))
-						}));
-					match self2
-						.example_endpoint
-						.call_streaming(
-							&id,
-							Req::new(ExampleMessage { example_field })
-								.unwrap()
-								.with_stream(stream),
-							PRIO_NORMAL,
-						)
-						.await
-					{
-						Ok(resp) => {
-							let (resp, stream) = resp.into_parts();
-							info!(
-								"Got example response to {} from {}: {:?}",
-								example_field,
-								hex::encode(id),
-								resp
-							);
-							let mut stream = stream.unwrap();
-							while let Some(x) = stream.next().await {
-								info!("Response: stream got bytes {:?}", x.map(|b| b.len()));
-							}
-						}
-						Err(e) => warn!("Error with example request: {}", e),
-					}
-				});
-			}
-		}
-	}
-}
-
-#[async_trait]
-impl StreamingEndpointHandler<ExampleMessage> for Example {
-	async fn handle(
-		self: &Arc<Self>,
-		mut msg: Req<ExampleMessage>,
-		_from: NodeID,
-	) -> Resp<ExampleMessage> {
-		info!(
-			"Got example message: {:?}, sending example response",
-			msg.msg()
-		);
-		let source_stream = msg.take_stream().unwrap();
-		// Return same stream with 300ms delay
-		let new_stream = Box::pin(source_stream.then(|x| async move {
-			tokio::time::sleep(Duration::from_millis(300)).await;
-			x
-		}));
-		Resp::new(ExampleResponse {
-			example_field: false,
-		})
-		.with_stream(new_stream)
-	}
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-struct ExampleMessage {
-	example_field: usize,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-struct ExampleResponse {
-	example_field: bool,
-}
-
-impl Message for ExampleMessage {
-	type Response = ExampleResponse;
-}

src/bytes_buf.rs

@@ -1,186 +0,0 @@
-use std::cmp::Ordering;
-use std::collections::VecDeque;
-
-use bytes::BytesMut;
-
-pub use bytes::Bytes;
-
-/// A circular buffer of bytes, internally represented as a list of Bytes
-/// for optimization, but that for all intent and purposes acts just like
-/// a big byte slice which can be extended on the right and from which
-/// stuff can be taken on the left.
-pub struct BytesBuf {
-	buf: VecDeque<Bytes>,
-	buf_len: usize,
-}
-
-impl BytesBuf {
-	/// Creates a new empty BytesBuf
-	pub fn new() -> Self {
-		Self {
-			buf: VecDeque::new(),
-			buf_len: 0,
-		}
-	}
-
-	/// Returns the number of bytes stored in the BytesBuf
-	#[inline]
-	pub fn len(&self) -> usize {
-		self.buf_len
-	}
-
-	/// Returns true iff the BytesBuf contains zero bytes
-	#[inline]
-	pub fn is_empty(&self) -> bool {
-		self.buf_len == 0
-	}
-
-	/// Adds some bytes to the right of the buffer
-	pub fn extend(&mut self, b: Bytes) {
-		if !b.is_empty() {
-			self.buf_len += b.len();
-			self.buf.push_back(b);
-		}
-	}
-
-	/// Takes the whole content of the buffer and returns it as a single Bytes unit
-	pub fn take_all(&mut self) -> Bytes {
-		if self.buf.is_empty() {
-			Bytes::new()
-		} else if self.buf.len() == 1 {
-			self.buf_len = 0;
-			self.buf.pop_back().unwrap()
-		} else {
-			let mut ret = BytesMut::with_capacity(self.buf_len);
-			for b in self.buf.iter() {
-				ret.extend_from_slice(&b[..]);
-			}
-			self.buf.clear();
-			self.buf_len = 0;
-			ret.freeze()
-		}
-	}
-
-	/// Takes at most max_len bytes from the left of the buffer
-	pub fn take_max(&mut self, max_len: usize) -> Bytes {
-		if self.buf_len <= max_len {
-			self.take_all()
-		} else {
-			self.take_exact_ok(max_len)
-		}
-	}
-
-	/// Take exactly len bytes from the left of the buffer, returns None if
-	/// the BytesBuf doesn't contain enough data
-	pub fn take_exact(&mut self, len: usize) -> Option<Bytes> {
-		if self.buf_len < len {
-			None
-		} else {
-			Some(self.take_exact_ok(len))
-		}
-	}
-
-	fn take_exact_ok(&mut self, len: usize) -> Bytes {
-		assert!(len <= self.buf_len);
-		let front = self.buf.pop_front().unwrap();
-		match front.len().cmp(&len) {
-			Ordering::Greater => {
-				self.buf.push_front(front.slice(len..));
-				self.buf_len -= len;
-				front.slice(..len)
-			}
-			Ordering::Equal => {
-				self.buf_len -= len;
-				front
-			}
-			Ordering::Less => {
-				let mut ret = BytesMut::with_capacity(len);
-				ret.extend_from_slice(&front[..]);
-				self.buf_len -= front.len();
-				while ret.len() < len {
-					let front = self.buf.pop_front().unwrap();
-					if front.len() > len - ret.len() {
-						let take = len - ret.len();
-						ret.extend_from_slice(&front[..take]);
-						self.buf.push_front(front.slice(take..));
-						self.buf_len -= take;
-						break;
-					} else {
-						ret.extend_from_slice(&front[..]);
-						self.buf_len -= front.len();
-					}
-				}
-				ret.freeze()
-			}
-		}
-	}
-
-	/// Return the internal sequence of Bytes slices that make up the buffer
-	pub fn into_slices(self) -> VecDeque<Bytes> {
-		self.buf
-	}
-}
-
-impl Default for BytesBuf {
-	fn default() -> Self {
-		Self::new()
-	}
-}
-
-impl From<Bytes> for BytesBuf {
-	fn from(b: Bytes) -> BytesBuf {
-		let mut ret = BytesBuf::new();
-		ret.extend(b);
-		ret
-	}
-}
-
-impl From<BytesBuf> for Bytes {
-	fn from(mut b: BytesBuf) -> Bytes {
-		b.take_all()
-	}
-}
-
-#[cfg(test)]
-mod test {
-	use super::*;
-
-	#[test]
-	fn test_bytes_buf() {
-		let mut buf = BytesBuf::new();
-		assert!(buf.len() == 0);
-		assert!(buf.is_empty());
-
-		buf.extend(Bytes::from(b"Hello, world!".to_vec()));
-		assert!(buf.len() == 13);
-		assert!(!buf.is_empty());
-
-		buf.extend(Bytes::from(b"1234567890".to_vec()));
-		assert!(buf.len() == 23);
-		assert!(!buf.is_empty());
-
-		assert_eq!(
-			buf.take_all(),
-			Bytes::from(b"Hello, world!1234567890".to_vec())
-		);
-		assert!(buf.len() == 0);
-		assert!(buf.is_empty());
-
-		buf.extend(Bytes::from(b"1234567890".to_vec()));
-		buf.extend(Bytes::from(b"Hello, world!".to_vec()));
-		assert!(buf.len() == 23);
-		assert!(!buf.is_empty());
-
-		assert_eq!(buf.take_max(12), Bytes::from(b"1234567890He".to_vec()));
-		assert!(buf.len() == 11);
-
-		assert_eq!(buf.take_exact(12), None);
-		assert!(buf.len() == 11);
-		assert_eq!(
-			buf.take_exact(11),
-			Some(Bytes::from(b"llo, world!".to_vec()))
-		);
-		assert!(buf.len() == 0);
-		assert!(buf.is_empty());
-	}
-}

src/client.rs

@@ -1,18 +1,13 @@
+use std::borrow::Borrow;
 use std::collections::HashMap;
 use std::net::SocketAddr;
-use std::pin::Pin;
 use std::sync::atomic::{self, AtomicU32};
 use std::sync::{Arc, Mutex};
-use std::task::Poll;
 
 use arc_swap::ArcSwapOption;
-use async_trait::async_trait;
-use bytes::Bytes;
 use log::{debug, error, trace};
 
-use futures::io::AsyncReadExt;
+use futures::channel::mpsc::{unbounded, UnboundedReceiver};
-use futures::Stream;
-use kuska_handshake::async_std::{handshake_client, BoxStream};
 use tokio::net::TcpStream;
 use tokio::select;
 use tokio::sync::{mpsc, oneshot, watch};
@@ -26,22 +21,28 @@ use opentelemetry::{
 #[cfg(feature = "telemetry")]
 use opentelemetry_contrib::trace::propagator::binary::*;
 
+use futures::io::AsyncReadExt;
+
+use async_trait::async_trait;
+
+use kuska_handshake::async_std::{handshake_client, BoxStream};
+
+use crate::endpoint::*;
 use crate::error::*;
-use crate::message::*;
 use crate::netapp::*;
-use crate::recv::*;
+use crate::proto::*;
-use crate::send::*;
+use crate::proto2::*;
-use crate::stream::*;
 use crate::util::*;
 
 pub(crate) struct ClientConn {
 	pub(crate) remote_addr: SocketAddr,
 	pub(crate) peer_id: NodeID,
 
-	query_send: ArcSwapOption<mpsc::UnboundedSender<SendItem>>,
+	query_send:
+		ArcSwapOption<mpsc::UnboundedSender<(RequestID, RequestPriority, AssociatedStream)>>,
 
 	next_query_number: AtomicU32,
-	inflight: Mutex<HashMap<RequestID, oneshot::Sender<ByteStream>>>,
+	inflight: Mutex<HashMap<RequestID, oneshot::Sender<UnboundedReceiver<Packet>>>>,
 }
 
 impl ClientConn {
@@ -65,7 +66,7 @@ impl ClientConn {
 
 		debug!(
 			"Handshake complete (client) with {}@{}",
-			hex::encode(peer_id),
+			hex::encode(&peer_id),
 			remote_addr
 		);
 
@@ -103,16 +104,13 @@ impl ClientConn {
 
 		netapp.connected_as_client(peer_id, conn.clone());
 
-		let debug_name = format!("CLI {}", hex::encode(&peer_id[..8]));
-
 		tokio::spawn(async move {
-			let debug_name_2 = debug_name.clone();
+			let send_future = tokio::spawn(conn.clone().send_loop(query_recv, write));
-			let send_future = tokio::spawn(conn.clone().send_loop(query_recv, write, debug_name_2));
 
 			let conn2 = conn.clone();
 			let recv_future = tokio::spawn(async move {
 				select! {
-					r = conn2.recv_loop(read, debug_name) => r,
+					r = conn2.recv_loop(read) => r,
 					_ = await_exit(stop_recv_loop_recv) => Ok(())
 				}
 			});
@@ -140,14 +138,15 @@ impl ClientConn {
 		self.query_send.store(None);
 	}
 
-	pub(crate) async fn call<T>(
+	pub(crate) async fn call<T, B>(
 		self: Arc<Self>,
-		req: Req<T>,
+		rq: B,
 		path: &str,
 		prio: RequestPriority,
-	) -> Result<Resp<T>, Error>
+	) -> Result<<T as Message>::Response, Error>
 	where
 		T: Message,
+		B: Borrow<T>,
 	{
 		let query_send = self.query_send.load_full().ok_or(Error::ConnectionClosed)?;
 
@@ -162,16 +161,24 @@ impl ClientConn {
 					.with_kind(SpanKind::Client)
 					.start(&tracer);
 				let propagator = BinaryPropagator::new();
-				let telemetry_id: Bytes = propagator.to_bytes(span.span_context()).to_vec().into();
+				let telemetry_id = Some(propagator.to_bytes(span.span_context()).to_vec());
 			} else {
-				let telemetry_id: Bytes = Bytes::new();
+				let telemetry_id: Option<Vec<u8>> = None;
 			}
 		};
 
 		// Encode request
-		let req_enc = req.into_enc(prio, path.as_bytes().to_vec().into(), telemetry_id);
+		let (body, stream) = rmp_to_vec_all_named(rq.borrow())?;
-		let req_msg_len = req_enc.msg.len();
+		drop(rq);
-		let (req_stream, req_order) = req_enc.encode();
+
+		let request = QueryMessage {
+			prio,
+			path: path.as_bytes(),
+			telemetry_id,
+			body: &body[..],
+		};
+		let bytes = request.encode();
+		drop(body);
 
 		// Send request through
 		let (resp_send, resp_recv) = oneshot::channel();
@@ -180,25 +187,17 @@ impl ClientConn {
 			error!(
 				"Too many inflight requests! RequestID collision. Interrupting previous request."
 			);
-			let _ = old_ch.send(Box::pin(futures::stream::once(async move {
+			if old_ch.send(unbounded().1).is_err() {
-				Err(std::io::Error::new(
+				debug!("Could not send empty response to collisionned request, probably because request was interrupted. Dropping response.");
-					std::io::ErrorKind::Other,
+			}
-					"RequestID collision, too many inflight requests",
-				))
-			})));
 		}
 
-		debug!(
+		trace!("request: query_send {}, {} bytes", id, bytes.len());
-			"request: query_send {}, path {}, prio {} (serialized message: {} bytes)",
-			id, path, prio, req_msg_len
-		);
 
 		#[cfg(feature = "telemetry")]
-		span.set_attribute(KeyValue::new("len_query_msg", req_msg_len as i64));
+		span.set_attribute(KeyValue::new("len_query", bytes.len() as i64));
 
-		query_send.send(SendItem::Stream(id, prio, req_order, req_stream))?;
+		query_send.send((id, prio, Framing::new(bytes, stream).into_stream()))?;
-
-		let canceller = CancelOnDrop::new(id, query_send.as_ref().clone());
 
 		cfg_if::cfg_if! {
 			if #[cfg(feature = "telemetry")] {
@@ -209,12 +208,24 @@ impl ClientConn {
 				let stream = resp_recv.await?;
 			}
 		}
+		let (resp, stream) = Framing::from_stream(stream).await?.into_parts();
 
-		let stream = Box::pin(canceller.for_stream(stream));
+		if resp.is_empty() {
+			return Err(Error::Message(
+				"Response is 0 bytes, either a collision or a protocol error".into(),
+			));
+		}
 
-		let resp_enc = RespEnc::decode(stream).await?;
+		trace!("request response {}: ", id);
-		debug!("client: got response to request {} (path {})", id, path);
+
-		Resp::from_enc(resp_enc)
+		let code = resp[0];
+		if code == 0 {
+			let ser_resp = rmp_serde::decode::from_read_ref(&resp[1..])?;
+			Ok(T::Response::deserialize_msg(ser_resp, stream).await)
+		} else {
+			let msg = String::from_utf8(resp[1..].to_vec()).unwrap_or_default();
+			Err(Error::Remote(code, msg))
+		}
 	}
 }
 
@@ -222,7 +233,7 @@ impl SendLoop for ClientConn {}
 
 #[async_trait]
 impl RecvLoop for ClientConn {
-	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: ByteStream) {
+	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: UnboundedReceiver<Packet>) {
 		trace!("ClientConn recv_handler {}", id);
 
 		let mut inflight = self.inflight.lock().unwrap();
@@ -230,63 +241,6 @@ impl RecvLoop for ClientConn {
 			if ch.send(stream).is_err() {
 				debug!("Could not send request response, probably because request was interrupted. Dropping response.");
 			}
-		} else {
-			debug!("Got unexpected response to request {}, dropping it", id);
 		}
 	}
 }
-
-// ----
-
-struct CancelOnDrop {
-	id: RequestID,
-	query_send: mpsc::UnboundedSender<SendItem>,
-}
-
-impl CancelOnDrop {
-	fn new(id: RequestID, query_send: mpsc::UnboundedSender<SendItem>) -> Self {
-		Self { id, query_send }
-	}
-	fn for_stream(self, stream: ByteStream) -> CancelOnDropStream {
-		CancelOnDropStream {
-			cancel: Some(self),
-			stream,
-		}
-	}
-}
-
-impl Drop for CancelOnDrop {
-	fn drop(&mut self) {
-		trace!("cancelling request {}", self.id);
-		let _ = self.query_send.send(SendItem::Cancel(self.id));
-	}
-}
-
-#[pin_project::pin_project]
-struct CancelOnDropStream {
-	cancel: Option<CancelOnDrop>,
-	#[pin]
-	stream: ByteStream,
-}
-
-impl Stream for CancelOnDropStream {
-	type Item = Packet;
-
-	fn poll_next(
-		self: Pin<&mut Self>,
-		cx: &mut std::task::Context<'_>,
-	) -> Poll<Option<Self::Item>> {
-		let this = self.project();
-		let res = this.stream.poll_next(cx);
-		if matches!(res, Poll::Ready(None)) {
-			if let Some(c) = this.cancel.take() {
-				std::mem::forget(c)
-			}
-		}
-		res
-	}
-
-	fn size_hint(&self) -> (usize, Option<usize>) {
-		self.stream.size_hint()
-	}
-}

src/endpoint.rs

@@ -1,43 +1,87 @@
+use std::borrow::Borrow;
 use std::marker::PhantomData;
 use std::sync::Arc;
 
 use arc_swap::ArcSwapOption;
 use async_trait::async_trait;
 
-use crate::error::Error;
+use serde::{Deserialize, Serialize};
-use crate::message::*;
-use crate::netapp::*;
 
-/// This trait should be implemented by an object of your application
+use crate::error::Error;
-/// that can handle a message of type `M`, if it wishes to handle
+use crate::netapp::*;
-/// streams attached to the request and/or to send back streams
+use crate::proto::*;
-/// attached to the response..
+use crate::util::*;
-///
+
-/// The handler object should be in an Arc, see `Endpoint::set_handler`
+/// This trait should be implemented by all messages your application
-#[async_trait]
+/// wants to handle
-pub trait StreamingEndpointHandler<M>: Send + Sync
+pub trait Message: SerializeMessage + Send + Sync {
-where
+	type Response: SerializeMessage + Send + Sync;
-	M: Message,
-{
-	async fn handle(self: &Arc<Self>, m: Req<M>, from: NodeID) -> Resp<M>;
 }
 
-/// If one simply wants to use an endpoint in a client fashion,
+/// A trait for de/serializing messages, with possible associated stream.
-/// without locally serving requests to that endpoint,
-/// use the unit type `()` as the handler type:
-/// it will panic if it is ever made to handle request.
 #[async_trait]
-impl<M: Message> EndpointHandler<M> for () {
+pub trait SerializeMessage: Sized {
-	async fn handle(self: &Arc<()>, _m: &M, _from: NodeID) -> M::Response {
+	type SerializableSelf: Serialize + for<'de> Deserialize<'de> + Send;
-		panic!("This endpoint should not have a local handler.");
+
+	fn serialize_msg(&self) -> (Self::SerializableSelf, Option<AssociatedStream>);
+
+	// TODO should return Result
+	async fn deserialize_msg(ser_self: Self::SerializableSelf, stream: AssociatedStream) -> Self;
+}
+
+pub trait AutoSerialize: Serialize + for<'de> Deserialize<'de> + Clone + Send + Sync {}
+
+#[async_trait]
+impl<T> SerializeMessage for T
+where
+	T: AutoSerialize,
+{
+	type SerializableSelf = Self;
+	fn serialize_msg(&self) -> (Self::SerializableSelf, Option<AssociatedStream>) {
+		(self.clone(), None)
+	}
+
+	async fn deserialize_msg(ser_self: Self::SerializableSelf, _stream: AssociatedStream) -> Self {
+		// TODO verify no stream
+		ser_self
 	}
 }
 
-// ----
+impl AutoSerialize for () {}
+
+#[async_trait]
+impl<T, E> SerializeMessage for Result<T, E>
+where
+	T: SerializeMessage + Send,
+	E: SerializeMessage + Send,
+{
+	type SerializableSelf = Result<T::SerializableSelf, E::SerializableSelf>;
+
+	fn serialize_msg(&self) -> (Self::SerializableSelf, Option<AssociatedStream>) {
+		match self {
+			Ok(ok) => {
+				let (msg, stream) = ok.serialize_msg();
+				(Ok(msg), stream)
+			}
+			Err(err) => {
+				let (msg, stream) = err.serialize_msg();
+				(Err(msg), stream)
+			}
+		}
+	}
+
+	async fn deserialize_msg(ser_self: Self::SerializableSelf, stream: AssociatedStream) -> Self {
+		match ser_self {
+			Ok(ok) => Ok(T::deserialize_msg(ok, stream).await),
+			Err(err) => Err(E::deserialize_msg(err, stream).await),
+		}
+	}
+}
 
 /// This trait should be implemented by an object of your application
-/// that can handle a message of type `M`, in the cases where it doesn't
+/// that can handle a message of type `M`.
-/// care about attached stream in the request nor in the response.
+///
+/// The handler object should be in an Arc, see `Endpoint::set_handler`
 #[async_trait]
 pub trait EndpointHandler<M>: Send + Sync
 where
@@ -46,22 +90,17 @@ where
 	async fn handle(self: &Arc<Self>, m: &M, from: NodeID) -> M::Response;
 }
 
+/// If one simply wants to use an endpoint in a client fashion,
+/// without locally serving requests to that endpoint,
+/// use the unit type `()` as the handler type:
+/// it will panic if it is ever made to handle request.
 #[async_trait]
-impl<T, M> StreamingEndpointHandler<M> for T
+impl<M: Message + 'static> EndpointHandler<M> for () {
-where
+	async fn handle(self: &Arc<()>, _m: &M, _from: NodeID) -> M::Response {
-	T: EndpointHandler<M>,
+		panic!("This endpoint should not have a local handler.");
-	M: Message,
-{
-	async fn handle(self: &Arc<Self>, mut m: Req<M>, from: NodeID) -> Resp<M> {
-		// Immediately drop stream to ignore all data that comes in,
-		// instead of buffering it indefinitely
-		drop(m.take_stream());
-		Resp::new(EndpointHandler::handle(self, m.msg(), from).await)
 	}
 }
 
-// ----
-
 /// This struct represents an endpoint for message of type `M`.
 ///
 /// Creating a new endpoint is done by calling `NetApp::endpoint`.
@@ -71,13 +110,13 @@ where
 /// An `Endpoint` is used both to send requests to remote nodes,
 /// and to specify the handler for such requests on the local node.
 /// The type `H` represents the type of the handler object for
-/// endpoint messages (see `StreamingEndpointHandler`).
+/// endpoint messages (see `EndpointHandler`).
 pub struct Endpoint<M, H>
 where
 	M: Message,
-	H: StreamingEndpointHandler<M>,
+	H: EndpointHandler<M>,
 {
-	_phantom: PhantomData<M>,
+	phantom: PhantomData<M>,
 	netapp: Arc<NetApp>,
 	path: String,
 	handler: ArcSwapOption<H>,
@@ -86,11 +125,11 @@ where
 impl<M, H> Endpoint<M, H>
 where
 	M: Message,
-	H: StreamingEndpointHandler<M>,
+	H: EndpointHandler<M>,
 {
 	pub(crate) fn new(netapp: Arc<NetApp>, path: String) -> Self {
 		Self {
-			_phantom: PhantomData::default(),
+			phantom: PhantomData::default(),
 			netapp,
 			path,
 			handler: ArcSwapOption::from(None),
@@ -109,22 +148,20 @@ where
 	}
 
 	/// Call this endpoint on a remote node (or on the local node,
-	/// for that matter). This function invokes the full version that
+	/// for that matter)
-	/// allows to attach a stream to the request and to
+	pub async fn call<B>(
-	/// receive such a stream attached to the response.
-	pub async fn call_streaming<T>(
 		&self,
 		target: &NodeID,
-		req: T,
+		req: B,
 		prio: RequestPriority,
-	) -> Result<Resp<M>, Error>
+	) -> Result<<M as Message>::Response, Error>
 	where
-		T: IntoReq<M>,
+		B: Borrow<M> + Send + Sync,
 	{
 		if *target == self.netapp.id {
 			match self.handler.load_full() {
 				None => Err(Error::NoHandler),
-				Some(h) => Ok(h.handle(req.into_req_local(), self.netapp.id).await),
+				Some(h) => Ok(h.handle(req.borrow(), self.netapp.id).await),
 			}
 		} else {
 			let conn = self
@@ -139,22 +176,10 @@ where
 					"Not connected: {}",
 					hex::encode(&target[..8])
 				))),
-				Some(c) => c.call(req.into_req()?, self.path.as_str(), prio).await,
+				Some(c) => c.call(req, self.path.as_str(), prio).await,
 			}
 		}
 	}
-
-	/// Call this endpoint on a remote node. This function is the simplified
-	/// version that doesn't allow to have streams attached to the request
-	/// or the response; see `call_streaming` for the full version.
-	pub async fn call(
-		&self,
-		target: &NodeID,
-		req: M,
-		prio: RequestPriority,
-	) -> Result<<M as Message>::Response, Error> {
-		Ok(self.call_streaming(target, req, prio).await?.into_msg())
-	}
 }
 
 // ---- Internal stuff ----
@@ -163,7 +188,12 @@ pub(crate) type DynEndpoint = Box<dyn GenericEndpoint + Send + Sync>;
 
 #[async_trait]
 pub(crate) trait GenericEndpoint {
-	async fn handle(&self, req_enc: ReqEnc, from: NodeID) -> Result<RespEnc, Error>;
+	async fn handle(
+		&self,
+		buf: &[u8],
+		stream: AssociatedStream,
+		from: NodeID,
+	) -> Result<(Vec<u8>, Option<AssociatedStream>), Error>;
 	fn drop_handler(&self);
 	fn clone_endpoint(&self) -> DynEndpoint;
 }
@@ -172,21 +202,28 @@ pub(crate) trait GenericEndpoint {
 pub(crate) struct EndpointArc<M, H>(pub(crate) Arc<Endpoint<M, H>>)
 where
 	M: Message,
-	H: StreamingEndpointHandler<M>;
+	H: EndpointHandler<M>;
 
 #[async_trait]
 impl<M, H> GenericEndpoint for EndpointArc<M, H>
 where
-	M: Message,
+	M: Message + 'static,
-	H: StreamingEndpointHandler<M> + 'static,
+	H: EndpointHandler<M> + 'static,
 {
-	async fn handle(&self, req_enc: ReqEnc, from: NodeID) -> Result<RespEnc, Error> {
+	async fn handle(
+		&self,
+		buf: &[u8],
+		stream: AssociatedStream,
+		from: NodeID,
+	) -> Result<(Vec<u8>, Option<AssociatedStream>), Error> {
 		match self.0.handler.load_full() {
 			None => Err(Error::NoHandler),
 			Some(h) => {
-				let req = Req::from_enc(req_enc)?;
+				let req = rmp_serde::decode::from_read_ref(buf)?;
-				let res = h.handle(req, from).await;
+				let req = M::deserialize_msg(req, stream).await;
-				Ok(res.into_enc()?)
+				let res = h.handle(&req, from).await;
+				let res_bytes = rmp_to_vec_all_named(&res)?;
+				Ok(res_bytes)
 			}
 		}
 	}

src/error.rs

@@ -1,6 +1,6 @@
+use err_derive::Error;
 use std::io;
 
-use err_derive::Error;
 use log::error;
 
 #[derive(Debug, Error)]
@@ -28,12 +28,6 @@ pub enum Error {
 	#[error(display = "Framing protocol error")]
 	Framing,
 
-	#[error(display = "Remote error ({:?}): {}", _0, _1)]
-	Remote(io::ErrorKind, String),
-
-	#[error(display = "Request ID collision")]
-	IdCollision,
-
 	#[error(display = "{}", _0)]
 	Message(String),
 
@@ -45,6 +39,29 @@ pub enum Error {
 
 	#[error(display = "Version mismatch: {}", _0)]
 	VersionMismatch(String),
+
+	#[error(display = "Remote error {}: {}", _0, _1)]
+	Remote(u8, String),
+}
+
+impl Error {
+	pub fn code(&self) -> u8 {
+		match self {
+			Self::Io(_) => 100,
+			Self::TokioJoin(_) => 110,
+			Self::OneshotRecv(_) => 111,
+			Self::RMPEncode(_) => 10,
+			Self::RMPDecode(_) => 11,
+			Self::UTF8(_) => 12,
+			Self::Framing => 13,
+			Self::NoHandler => 20,
+			Self::ConnectionClosed => 21,
+			Self::Handshake(_) => 30,
+			Self::VersionMismatch(_) => 31,
+			Self::Remote(c, _) => *c,
+			Self::Message(_) => 99,
+		}
+	}
 }
 
 impl<T> From<tokio::sync::watch::error::SendError<T>> for Error {
@@ -88,39 +105,3 @@ where
 		}
 	}
 }
-
-// ---- Helpers for serializing I/O Errors
-
-pub(crate) fn u8_to_io_errorkind(v: u8) -> std::io::ErrorKind {
-	use std::io::ErrorKind;
-	match v {
-		101 => ErrorKind::ConnectionAborted,
-		102 => ErrorKind::BrokenPipe,
-		103 => ErrorKind::WouldBlock,
-		104 => ErrorKind::InvalidInput,
-		105 => ErrorKind::InvalidData,
-		106 => ErrorKind::TimedOut,
-		107 => ErrorKind::Interrupted,
-		108 => ErrorKind::UnexpectedEof,
-		109 => ErrorKind::OutOfMemory,
-		110 => ErrorKind::ConnectionReset,
-		_ => ErrorKind::Other,
-	}
-}
-
-pub(crate) fn io_errorkind_to_u8(kind: std::io::ErrorKind) -> u8 {
-	use std::io::ErrorKind;
-	match kind {
-		ErrorKind::ConnectionAborted => 101,
-		ErrorKind::BrokenPipe => 102,
-		ErrorKind::WouldBlock => 103,
-		ErrorKind::InvalidInput => 104,
-		ErrorKind::InvalidData => 105,
-		ErrorKind::TimedOut => 106,
-		ErrorKind::Interrupted => 107,
-		ErrorKind::UnexpectedEof => 108,
-		ErrorKind::OutOfMemory => 109,
-		ErrorKind::ConnectionReset => 110,
-		_ => 100,
-	}
-}

src/lib.rs

@@ -13,23 +13,21 @@
 //! about message priorization.
 //! Also check out the examples to learn how to use this crate.
 
-pub mod bytes_buf;
 pub mod error;
-pub mod stream;
 pub mod util;
 
 pub mod endpoint;
-pub mod message;
+pub mod proto;
 
 mod client;
-mod recv;
+mod proto2;
-mod send;
 mod server;
 
 pub mod netapp;
 pub mod peering;
 
 pub use crate::netapp::*;
+pub use util::{NetworkKey, NodeID, NodeKey};
 
 #[cfg(test)]
 mod test;

src/message.rs

@@ -1,522 +0,0 @@
-use std::fmt;
-use std::marker::PhantomData;
-use std::sync::Arc;
-
-use bytes::{BufMut, Bytes, BytesMut};
-use rand::prelude::*;
-use serde::{Deserialize, Serialize};
-
-use futures::stream::StreamExt;
-
-use crate::error::*;
-use crate::stream::*;
-use crate::util::*;
-
-/// Priority of a request (click to read more about priorities).
-///
-/// This priority value is used to priorize messages
-/// in the send queue of the client, and their responses in the send queue of the
-/// server. Lower values mean higher priority.
-///
-/// This mechanism is usefull for messages bigger than the maximum chunk size
-/// (set at `0x4000` bytes), such as large file transfers.
-/// In such case, all of the messages in the send queue with the highest priority
-/// will take turns to send individual chunks, in a round-robin fashion.
-/// Once all highest priority messages are sent successfully, the messages with
-/// the next highest priority will begin being sent in the same way.
-///
-/// The same priority value is given to a request and to its associated response.
-pub type RequestPriority = u8;
-
-/// Priority class: high
-pub const PRIO_HIGH: RequestPriority = 0x20;
-/// Priority class: normal
-pub const PRIO_NORMAL: RequestPriority = 0x40;
-/// Priority class: background
-pub const PRIO_BACKGROUND: RequestPriority = 0x80;
-/// Priority: primary among given class
-pub const PRIO_PRIMARY: RequestPriority = 0x00;
-/// Priority: secondary among given class (ex: `PRIO_HIGH | PRIO_SECONDARY`)
-pub const PRIO_SECONDARY: RequestPriority = 0x01;
-
-// ----
-
-/// An order tag can be added to a message or a response to indicate
-/// whether it should be sent after or before other messages with order tags
-/// referencing a same stream
-#[derive(Clone, Copy, Serialize, Deserialize, Debug)]
-pub struct OrderTag(pub(crate) u64, pub(crate) u64);
-
-/// A stream is an opaque identifier that defines a set of messages
-/// or responses that are ordered wrt one another using to order tags.
-#[derive(Clone, Copy)]
-pub struct OrderTagStream(u64);
-
-impl OrderTag {
-	/// Create a new stream from which to generate order tags. Example:
-	/// ```ignore
-	/// let stream = OrderTag.stream();
-	/// let tag_1 = stream.order(1);
-	/// let tag_2 = stream.order(2);
-	/// ```
-	pub fn stream() -> OrderTagStream {
-		OrderTagStream(thread_rng().gen())
-	}
-}
-impl OrderTagStream {
-	/// Create the order tag for message `order` in this stream
-	pub fn order(&self, order: u64) -> OrderTag {
-		OrderTag(self.0, order)
-	}
-}
-
-// ----
-
-/// This trait should be implemented by all messages your application
-/// wants to handle. It specifies which data type should be sent
-/// as a response to this message in the RPC protocol.
-pub trait Message: Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static {
-	/// The type of the response that is sent in response to this message
-	type Response: Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static;
-}
-
-// ----
-
-/// The Req<M> is a helper object used to create requests and attach them
-/// a stream of data. If the stream is a fixed Bytes and not a ByteStream,
-/// Req<M> is cheaply clonable to allow the request to be sent to different
-/// peers (Clone will panic if the stream is a ByteStream).
-pub struct Req<M: Message> {
-	pub(crate) msg: Arc<M>,
-	pub(crate) msg_ser: Option<Bytes>,
-	pub(crate) stream: AttachedStream,
-	pub(crate) order_tag: Option<OrderTag>,
-}
-
-impl<M: Message> Req<M> {
-	/// Creates a new request from a base message `M`
-	pub fn new(v: M) -> Result<Self, Error> {
-		Ok(v.into_req()?)
-	}
-
-	/// Attach a stream to message in request, where the stream is streamed
-	/// from a fixed `Bytes` buffer
-	pub fn with_stream_from_buffer(self, b: Bytes) -> Self {
-		Self {
-			stream: AttachedStream::Fixed(b),
-			..self
-		}
-	}
-
-	/// Attach a stream to message in request, where the stream is
-	/// an instance of `ByteStream`. Note than when a `Req<M>` has an attached
-	/// stream which is a `ByteStream` instance, it can no longer be cloned
-	/// to be sent to different nodes (`.clone()` will panic)
-	pub fn with_stream(self, b: ByteStream) -> Self {
-		Self {
-			stream: AttachedStream::Stream(b),
-			..self
-		}
-	}
-
-	/// Add an order tag to this request to indicate in which order it should
-	/// be sent.
-	pub fn with_order_tag(self, order_tag: OrderTag) -> Self {
-		Self {
-			order_tag: Some(order_tag),
-			..self
-		}
-	}
-
-	/// Get a reference to the message `M` contained in this request
-	pub fn msg(&self) -> &M {
-		&self.msg
-	}
-
-	/// Takes out the stream attached to this request, if any
-	pub fn take_stream(&mut self) -> Option<ByteStream> {
-		std::mem::replace(&mut self.stream, AttachedStream::None).into_stream()
-	}
-
-	pub(crate) fn into_enc(
-		self,
-		prio: RequestPriority,
-		path: Bytes,
-		telemetry_id: Bytes,
-	) -> ReqEnc {
-		ReqEnc {
-			prio,
-			path,
-			telemetry_id,
-			msg: self.msg_ser.unwrap(),
-			stream: self.stream.into_stream(),
-			order_tag: self.order_tag,
-		}
-	}
-
-	pub(crate) fn from_enc(enc: ReqEnc) -> Result<Self, rmp_serde::decode::Error> {
-		let msg = rmp_serde::decode::from_slice(&enc.msg)?;
-		Ok(Req {
-			msg: Arc::new(msg),
-			msg_ser: Some(enc.msg),
-			stream: enc
-				.stream
-				.map(AttachedStream::Stream)
-				.unwrap_or(AttachedStream::None),
-			order_tag: enc.order_tag,
-		})
-	}
-}
-
-/// `IntoReq<M>` represents any object that can be transformed into `Req<M>`
-pub trait IntoReq<M: Message> {
-	/// Transform the object into a `Req<M>`, serializing the message M
-	/// to be sent to remote nodes
-	fn into_req(self) -> Result<Req<M>, rmp_serde::encode::Error>;
-	/// Transform the object into a `Req<M>`, skipping the serialization
-	/// of message M, in the case we are not sending this RPC message to
-	/// a remote node
-	fn into_req_local(self) -> Req<M>;
-}
-
-impl<M: Message> IntoReq<M> for M {
-	fn into_req(self) -> Result<Req<M>, rmp_serde::encode::Error> {
-		let msg_ser = rmp_to_vec_all_named(&self)?;
-		Ok(Req {
-			msg: Arc::new(self),
-			msg_ser: Some(Bytes::from(msg_ser)),
-			stream: AttachedStream::None,
-			order_tag: None,
-		})
-	}
-	fn into_req_local(self) -> Req<M> {
-		Req {
-			msg: Arc::new(self),
-			msg_ser: None,
-			stream: AttachedStream::None,
-			order_tag: None,
-		}
-	}
-}
-
-impl<M: Message> IntoReq<M> for Req<M> {
-	fn into_req(self) -> Result<Req<M>, rmp_serde::encode::Error> {
-		Ok(self)
-	}
-	fn into_req_local(self) -> Req<M> {
-		self
-	}
-}
-
-impl<M: Message> Clone for Req<M> {
-	fn clone(&self) -> Self {
-		let stream = match &self.stream {
-			AttachedStream::None => AttachedStream::None,
-			AttachedStream::Fixed(b) => AttachedStream::Fixed(b.clone()),
-			AttachedStream::Stream(_) => {
-				panic!("Cannot clone a Req<_> with a non-buffer attached stream")
-			}
-		};
-		Self {
-			msg: self.msg.clone(),
-			msg_ser: self.msg_ser.clone(),
-			stream,
-			order_tag: self.order_tag,
-		}
-	}
-}
-
-impl<M> fmt::Debug for Req<M>
-where
-	M: Message + fmt::Debug,
-{
-	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
-		write!(f, "Req[{:?}", self.msg)?;
-		match &self.stream {
-			AttachedStream::None => write!(f, "]"),
-			AttachedStream::Fixed(b) => write!(f, "; stream=buf:{}]", b.len()),
-			AttachedStream::Stream(_) => write!(f, "; stream]"),
-		}
-	}
-}
-
-// ----
-
-/// The Resp<M> represents a full response from a RPC that may have
-/// an attached stream.
-pub struct Resp<M: Message> {
-	pub(crate) _phantom: PhantomData<M>,
-	pub(crate) msg: M::Response,
-	pub(crate) stream: AttachedStream,
-	pub(crate) order_tag: Option<OrderTag>,
-}
-
-impl<M: Message> Resp<M> {
-	/// Creates a new response from a base response message
-	pub fn new(v: M::Response) -> Self {
-		Resp {
-			_phantom: Default::default(),
-			msg: v,
-			stream: AttachedStream::None,
-			order_tag: None,
-		}
-	}
-
-	/// Attach a stream to message in response, where the stream is streamed
-	/// from a fixed `Bytes` buffer
-	pub fn with_stream_from_buffer(self, b: Bytes) -> Self {
-		Self {
-			stream: AttachedStream::Fixed(b),
-			..self
-		}
-	}
-
-	/// Attach a stream to message in response, where the stream is
-	/// an instance of `ByteStream`.
-	pub fn with_stream(self, b: ByteStream) -> Self {
-		Self {
-			stream: AttachedStream::Stream(b),
-			..self
-		}
-	}
-
-	/// Add an order tag to this response to indicate in which order it should
-	/// be sent.
-	pub fn with_order_tag(self, order_tag: OrderTag) -> Self {
-		Self {
-			order_tag: Some(order_tag),
-			..self
-		}
-	}
-
-	/// Get a reference to the response message contained in this request
-	pub fn msg(&self) -> &M::Response {
-		&self.msg
-	}
-
-	/// Transforms the `Resp<M>` into the response message it contains,
-	/// dropping everything else (including attached data stream)
-	pub fn into_msg(self) -> M::Response {
-		self.msg
-	}
-
-	/// Transforms the `Resp<M>` into, on the one side, the response message
-	/// it contains, and on the other side, the associated data stream
-	/// if it exists
-	pub fn into_parts(self) -> (M::Response, Option<ByteStream>) {
-		(self.msg, self.stream.into_stream())
-	}
-
-	pub(crate) fn into_enc(self) -> Result<RespEnc, rmp_serde::encode::Error> {
-		Ok(RespEnc {
-			msg: rmp_to_vec_all_named(&self.msg)?.into(),
-			stream: self.stream.into_stream(),
-			order_tag: self.order_tag,
-		})
-	}
-
-	pub(crate) fn from_enc(enc: RespEnc) -> Result<Self, Error> {
-		let msg = rmp_serde::decode::from_slice(&enc.msg)?;
-		Ok(Self {
-			_phantom: Default::default(),
-			msg,
-			stream: enc
-				.stream
-				.map(AttachedStream::Stream)
-				.unwrap_or(AttachedStream::None),
-			order_tag: enc.order_tag,
-		})
-	}
-}
-
-impl<M> fmt::Debug for Resp<M>
-where
-	M: Message,
-	<M as Message>::Response: fmt::Debug,
-{
-	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
-		write!(f, "Resp[{:?}", self.msg)?;
-		match &self.stream {
-			AttachedStream::None => write!(f, "]"),
-			AttachedStream::Fixed(b) => write!(f, "; stream=buf:{}]", b.len()),
-			AttachedStream::Stream(_) => write!(f, "; stream]"),
-		}
-	}
-}
-
-// ----
-
-pub(crate) enum AttachedStream {
-	None,
-	Fixed(Bytes),
-	Stream(ByteStream),
-}
-
-impl AttachedStream {
-	pub fn into_stream(self) -> Option<ByteStream> {
-		match self {
-			AttachedStream::None => None,
-			AttachedStream::Fixed(b) => Some(Box::pin(futures::stream::once(async move { Ok(b) }))),
-			AttachedStream::Stream(s) => Some(s),
-		}
-	}
-}
-
-// ---- ----
-
-/// Encoding for requests into a ByteStream:
-/// - priority: u8
-/// - path length: u8
-/// - path: [u8; path length]
-/// - telemetry id length: u8
-/// - telemetry id: [u8; telemetry id length]
-/// - msg len: u32
-/// - msg [u8; ..]
-/// - the attached stream as the rest of the encoded stream
-pub(crate) struct ReqEnc {
-	pub(crate) prio: RequestPriority,
-	pub(crate) path: Bytes,
-	pub(crate) telemetry_id: Bytes,
-	pub(crate) msg: Bytes,
-	pub(crate) stream: Option<ByteStream>,
-	pub(crate) order_tag: Option<OrderTag>,
-}
-
-impl ReqEnc {
-	pub(crate) fn encode(self) -> (ByteStream, Option<OrderTag>) {
-		let mut buf = BytesMut::with_capacity(
-			self.path.len() + self.telemetry_id.len() + self.msg.len() + 16,
-		);
-
-		buf.put_u8(self.prio);
-
-		buf.put_u8(self.path.len() as u8);
-		buf.put(self.path);
-
-		buf.put_u8(self.telemetry_id.len() as u8);
-		buf.put(&self.telemetry_id[..]);
-
-		buf.put_u32(self.msg.len() as u32);
-
-		let header = buf.freeze();
-
-		let res_stream: ByteStream = if let Some(stream) = self.stream {
-			Box::pin(futures::stream::iter([Ok(header), Ok(self.msg)]).chain(stream))
-		} else {
-			Box::pin(futures::stream::iter([Ok(header), Ok(self.msg)]))
-		};
-		(res_stream, self.order_tag)
-	}
-
-	pub(crate) async fn decode(stream: ByteStream) -> Result<Self, Error> {
-		Self::decode_aux(stream)
-			.await
-			.map_err(read_exact_error_to_error)
-	}
-
-	async fn decode_aux(stream: ByteStream) -> Result<Self, ReadExactError> {
-		let mut reader = ByteStreamReader::new(stream);
-
-		let prio = reader.read_u8().await?;
-
-		let path_len = reader.read_u8().await?;
-		let path = reader.read_exact(path_len as usize).await?;
-
-		let telemetry_id_len = reader.read_u8().await?;
-		let telemetry_id = reader.read_exact(telemetry_id_len as usize).await?;
-
-		let msg_len = reader.read_u32().await?;
-		let msg = reader.read_exact(msg_len as usize).await?;
-
-		Ok(Self {
-			prio,
-			path,
-			telemetry_id,
-			msg,
-			stream: Some(reader.into_stream()),
-			order_tag: None,
-		})
-	}
-}
-
-/// Encoding for responses into a ByteStream:
-/// IF SUCCESS:
-/// - 0: u8
-/// - msg len: u32
-/// - msg [u8; ..]
-/// - the attached stream as the rest of the encoded stream
-/// IF ERROR:
-/// - message length + 1: u8
-/// - error code: u8
-/// - message: [u8; message_length]
-pub(crate) struct RespEnc {
-	msg: Bytes,
-	stream: Option<ByteStream>,
-	order_tag: Option<OrderTag>,
-}
-
-impl RespEnc {
-	pub(crate) fn encode(resp: Result<Self, Error>) -> (ByteStream, Option<OrderTag>) {
-		match resp {
-			Ok(Self {
-				msg,
-				stream,
-				order_tag,
-			}) => {
-				let mut buf = BytesMut::with_capacity(4);
-				buf.put_u32(msg.len() as u32);
-				let header = buf.freeze();
-
-				let res_stream: ByteStream = if let Some(stream) = stream {
-					Box::pin(futures::stream::iter([Ok(header), Ok(msg)]).chain(stream))
-				} else {
-					Box::pin(futures::stream::iter([Ok(header), Ok(msg)]))
-				};
-				(res_stream, order_tag)
-			}
-			Err(err) => {
-				let err = std::io::Error::new(
-					std::io::ErrorKind::Other,
-					format!("netapp error: {}", err),
-				);
-				(
-					Box::pin(futures::stream::once(async move { Err(err) })),
-					None,
-				)
-			}
-		}
-	}
-
-	pub(crate) async fn decode(stream: ByteStream) -> Result<Self, Error> {
-		Self::decode_aux(stream)
-			.await
-			.map_err(read_exact_error_to_error)
-	}
-
-	async fn decode_aux(stream: ByteStream) -> Result<Self, ReadExactError> {
-		let mut reader = ByteStreamReader::new(stream);
-
-		let msg_len = reader.read_u32().await?;
-		let msg = reader.read_exact(msg_len as usize).await?;
-
-		// Check whether the response stream still has data or not.
-		// If no more data is coming, this will defuse the request canceller.
-		// If we didn't do this, and the client doesn't try to read from the stream,
-		// the request canceller doesn't know that we read everything and
-		// sends a cancellation message to the server (which they don't care about).
-		reader.fill_buffer().await;
-
-		Ok(Self {
-			msg,
-			stream: Some(reader.into_stream()),
-			order_tag: None,
-		})
-	}
-}
-
-fn read_exact_error_to_error(e: ReadExactError) -> Error {
-	match e {
-		ReadExactError::Stream(err) => Error::Remote(err.kind(), err.to_string()),
-		ReadExactError::UnexpectedEos => Error::Framing,
-	}
-}

src/netapp.rs

@@ -20,15 +20,9 @@ use tokio::sync::{mpsc, watch};
 use crate::client::*;
 use crate::endpoint::*;
 use crate::error::*;
-use crate::message::*;
+use crate::proto::*;
 use crate::server::*;
-
+use crate::util::*;
-/// A node's identifier, which is also its public cryptographic key
-pub type NodeID = sodiumoxide::crypto::sign::ed25519::PublicKey;
-/// A node's secret key
-pub type NodeKey = sodiumoxide::crypto::sign::ed25519::SecretKey;
-/// A network key
-pub type NetworkKey = sodiumoxide::crypto::auth::Key;
 
 /// Tag which is exchanged between client and server upon connection establishment
 /// to check that they are running compatible versions of Netapp,
@@ -36,14 +30,16 @@ pub type NetworkKey = sodiumoxide::crypto::auth::Key;
 pub(crate) type VersionTag = [u8; 16];
 
 /// Value of the Netapp version used in the version tag
-pub(crate) const NETAPP_VERSION_TAG: u64 = 0x6e65746170700005; // netapp 0x0005
+pub(crate) const NETAPP_VERSION_TAG: u64 = 0x6e65746170700004; // netapp 0x0004
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub(crate) struct HelloMessage {
 	pub server_addr: Option<IpAddr>,
 	pub server_port: u16,
 }
 
+impl AutoSerialize for HelloMessage {}
+
 impl Message for HelloMessage {
 	type Response = ();
 }
@@ -158,7 +154,7 @@ impl NetApp {
 	pub fn endpoint<M, H>(self: &Arc<Self>, path: String) -> Arc<Endpoint<M, H>>
 	where
 		M: Message + 'static,
-		H: StreamingEndpointHandler<M> + 'static,
+		H: EndpointHandler<M> + 'static,
 	{
 		let endpoint = Arc::new(Endpoint::<M, H>::new(self.clone(), path.clone()));
 		let endpoint_arc = EndpointArc(endpoint.clone());
@@ -403,14 +399,13 @@ impl NetApp {
 				hello_endpoint
 					.call(
 						&conn.peer_id,
-						HelloMessage {
+						&HelloMessage {
 							server_addr,
 							server_port,
 						},
 						PRIO_NORMAL,
 					)
 					.await
-					.map(|_| ())
 					.log_err("Sending hello message");
 			});
 		}

src/peering/basalt.rs

@@ -14,8 +14,8 @@ use sodiumoxide::crypto::hash;
 use tokio::sync::watch;
 
 use crate::endpoint::*;
-use crate::message::*;
 use crate::netapp::*;
+use crate::proto::*;
 use crate::NodeID;
 
 // -- Protocol messages --
@@ -138,7 +138,7 @@ impl BasaltView {
 			let mut ret = vec![];
 			let mut rng = thread_rng();
 			for _i in 0..count {
-				let idx = rng.gen_range(0..possibles.len());
+				let idx = rng.gen_range(0, possibles.len());
 				ret.push(self.slots[possibles[idx]].peer.unwrap());
 			}
 			ret
@@ -331,7 +331,7 @@ impl Basalt {
 	async fn do_pull(self: Arc<Self>, peer: NodeID) {
 		match self
 			.pull_endpoint
-			.call(&peer, PullMessage {}, PRIO_NORMAL)
+			.call(&peer, &PullMessage {}, PRIO_NORMAL)
 			.await
 		{
 			Ok(resp) => {
@@ -346,7 +346,7 @@ impl Basalt {
 
 	async fn do_push(self: Arc<Self>, peer: NodeID) {
 		let push_msg = self.make_push_message();
-		match self.push_endpoint.call(&peer, push_msg, PRIO_NORMAL).await {
+		match self.push_endpoint.call(&peer, &push_msg, PRIO_NORMAL).await {
 			Ok(_) => {
 				trace!("KYEV PEXo {}", hex::encode(peer));
 			}

src/peering/fullmesh.rs

@@ -17,21 +17,19 @@ use sodiumoxide::crypto::hash;
 use crate::endpoint::*;
 use crate::error::*;
 use crate::netapp::*;
-
+use crate::proto::*;
-use crate::message::*;
 use crate::NodeID;
 
 const CONN_RETRY_INTERVAL: Duration = Duration::from_secs(30);
 const CONN_MAX_RETRIES: usize = 10;
-const PING_INTERVAL: Duration = Duration::from_secs(15);
+const PING_INTERVAL: Duration = Duration::from_secs(10);
 const LOOP_DELAY: Duration = Duration::from_secs(1);
-const FAILED_PING_THRESHOLD: usize = 4;
+const PING_TIMEOUT: Duration = Duration::from_secs(5);
-
+const FAILED_PING_THRESHOLD: usize = 3;
-const DEFAULT_PING_TIMEOUT_MILLIS: u64 = 10_000;
 
 // -- Protocol messages --
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Clone)]
 struct PingMessage {
 	pub id: u64,
 	pub peer_list_hash: hash::Digest,
@@ -41,7 +39,9 @@ impl Message for PingMessage {
 	type Response = PingMessage;
 }
 
-#[derive(Serialize, Deserialize)]
+impl AutoSerialize for PingMessage {}
+
+#[derive(Serialize, Deserialize, Clone)]
 struct PeerListMessage {
 	pub list: Vec<(NodeID, SocketAddr)>,
 }
@@ -50,6 +50,8 @@ impl Message for PeerListMessage {
 	type Response = PeerListMessage;
 }
 
+impl AutoSerialize for PeerListMessage {}
+
 // -- Algorithm data structures --
 
 #[derive(Debug)]
@@ -62,27 +64,11 @@ struct PeerInfoInternal {
 	all_addrs: Vec<SocketAddr>,
 
 	state: PeerConnState,
-	last_send_ping: Option<Instant>,
 	last_seen: Option<Instant>,
 	ping: VecDeque<Duration>,
 	failed_pings: usize,
 }
 
-impl PeerInfoInternal {
-	fn new(addr: SocketAddr, state: PeerConnState) -> Self {
-		Self {
-			addr,
-			all_addrs: vec![addr],
-			state,
-			last_send_ping: None,
-			last_seen: None,
-			ping: VecDeque::new(),
-			failed_pings: 0,
-		}
-	}
-}
-
-/// Information that the full mesh peering strategy can return about the peers it knows of
 #[derive(Copy, Clone, Debug)]
 pub struct PeerInfo {
 	/// The node's identifier (its public key)
@@ -113,7 +99,7 @@ impl PeerInfo {
 /// PeerConnState: possible states for our tentative connections to given peer
 /// This structure is only interested in recording connection info for outgoing
 /// TCP connections
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub enum PeerConnState {
 	/// This entry represents ourself (the local node)
 	Ourself,
@@ -185,8 +171,6 @@ pub struct FullMeshPeeringStrategy {
 	next_ping_id: AtomicU64,
 	ping_endpoint: Arc<Endpoint<PingMessage, Self>>,
 	peer_list_endpoint: Arc<Endpoint<PeerListMessage, Self>>,
-
-	ping_timeout_millis: AtomicU64,
 }
 
 impl FullMeshPeeringStrategy {
@@ -204,7 +188,14 @@ impl FullMeshPeeringStrategy {
 			if id != netapp.id {
 				known_hosts.list.insert(
 					id,
-					PeerInfoInternal::new(addr, PeerConnState::Waiting(0, Instant::now())),
+					PeerInfoInternal {
+						addr,
+						all_addrs: vec![addr],
+						state: PeerConnState::Waiting(0, Instant::now()),
+						last_seen: None,
+						ping: VecDeque::new(),
+						failed_pings: 0,
+					},
 				);
 			}
 		}
@@ -212,7 +203,14 @@ impl FullMeshPeeringStrategy {
 		if let Some(addr) = our_addr {
 			known_hosts.list.insert(
 				netapp.id,
-				PeerInfoInternal::new(addr, PeerConnState::Ourself),
+				PeerInfoInternal {
+					addr,
+					all_addrs: vec![addr],
+					state: PeerConnState::Ourself,
+					last_seen: None,
+					ping: VecDeque::new(),
+					failed_pings: 0,
+				},
 			);
 		}
 
@@ -223,7 +221,6 @@ impl FullMeshPeeringStrategy {
 			next_ping_id: AtomicU64::new(42),
 			ping_endpoint: netapp.endpoint("__netapp/peering/fullmesh.rs/Ping".into()),
 			peer_list_endpoint: netapp.endpoint("__netapp/peering/fullmesh.rs/PeerList".into()),
-			ping_timeout_millis: DEFAULT_PING_TIMEOUT_MILLIS.into(),
 		});
 
 		strat.update_public_peer_list(&strat.known_hosts.read().unwrap());
@@ -261,7 +258,7 @@ impl FullMeshPeeringStrategy {
 					trace!("{}, {:?}", hex::encode(&id[..8]), info);
 					match info.state {
 						PeerConnState::Connected => {
-							let must_ping = match info.last_send_ping {
+							let must_ping = match info.last_seen {
 								None => true,
 								Some(t) => Instant::now() - t > PING_INTERVAL,
 							};
@@ -281,16 +278,9 @@ impl FullMeshPeeringStrategy {
 			};
 
 			// 2. Dispatch ping to hosts
-			trace!("to_ping: {} peers", to_ping.len());
+			trace!("to_ping: {} peers", to_retry.len());
-			if !to_ping.is_empty() {
+			for id in to_ping {
-				let mut known_hosts = self.known_hosts.write().unwrap();
+				tokio::spawn(self.clone().ping(id));
-				for id in to_ping.iter() {
-					known_hosts.list.get_mut(id).unwrap().last_send_ping = Some(Instant::now());
-				}
-				drop(known_hosts);
-				for id in to_ping {
-					tokio::spawn(self.clone().ping(id));
-				}
 			}
 
 			// 3. Try reconnects
@@ -335,12 +325,6 @@ impl FullMeshPeeringStrategy {
 		self.public_peer_list.load_full()
 	}
 
-	/// Set the timeout for ping messages, in milliseconds
-	pub fn set_ping_timeout_millis(&self, timeout: u64) {
-		self.ping_timeout_millis
-			.store(timeout, atomic::Ordering::Relaxed);
-	}
-
 	// -- internal stuff --
 
 	fn update_public_peer_list(&self, known_hosts: &KnownHosts) {
@@ -382,8 +366,6 @@ impl FullMeshPeeringStrategy {
 		let peer_list_hash = self.known_hosts.read().unwrap().hash;
 		let ping_id = self.next_ping_id.fetch_add(1u64, atomic::Ordering::Relaxed);
 		let ping_time = Instant::now();
-		let ping_timeout =
-			Duration::from_millis(self.ping_timeout_millis.load(atomic::Ordering::Relaxed));
 		let ping_msg = PingMessage {
 			id: ping_id,
 			peer_list_hash,
@@ -396,8 +378,8 @@ impl FullMeshPeeringStrategy {
 			ping_time
 		);
 		let ping_response = select! {
-			r = self.ping_endpoint.call(&id, ping_msg, PRIO_HIGH) => r,
+			r = self.ping_endpoint.call(&id, &ping_msg, PRIO_HIGH) => r,
-			_ = tokio::time::sleep(ping_timeout) => Err(Error::Message("Ping timeout".into())),
+			_ = tokio::time::sleep(PING_TIMEOUT) => Err(Error::Message("Ping timeout".into())),
 		};
 
 		match ping_response {
@@ -448,7 +430,7 @@ impl FullMeshPeeringStrategy {
 		let pex_message = PeerListMessage { list: peer_list };
 		match self
 			.peer_list_endpoint
-			.call(id, pex_message, PRIO_BACKGROUND)
+			.call(id, &pex_message, PRIO_BACKGROUND)
 			.await
 		{
 			Err(e) => warn!("Error doing peer exchange: {}", e),
@@ -556,9 +538,17 @@ impl FullMeshPeeringStrategy {
 					host.all_addrs.push(addr);
 				}
 			} else {
-				known_hosts
+				known_hosts.list.insert(
-					.list
+					id,
-					.insert(id, PeerInfoInternal::new(addr, PeerConnState::Connected));
+					PeerInfoInternal {
+						state: PeerConnState::Connected,
+						addr,
+						all_addrs: vec![addr],
+						last_seen: None,
+						ping: VecDeque::new(),
+						failed_pings: 0,
+					},
+				);
 			}
 		}
 		known_hosts.update_hash();
@@ -583,7 +573,14 @@ impl FullMeshPeeringStrategy {
 		} else {
 			PeerConnState::Waiting(0, Instant::now())
 		};
-		PeerInfoInternal::new(addr, state)
+		PeerInfoInternal {
+			addr,
+			all_addrs: vec![addr],
+			state,
+			last_seen: None,
+			ping: VecDeque::new(),
+			failed_pings: 0,
+		}
 	}
 }
 

src/proto.rs

@@ -0,0 +1,617 @@
+use std::collections::{HashMap, VecDeque};
+use std::pin::Pin;
+use std::sync::Arc;
+use std::task::{Context, Poll};
+
+use log::trace;
+
+use futures::channel::mpsc::{unbounded, UnboundedReceiver, UnboundedSender};
+use futures::{AsyncReadExt, AsyncWriteExt};
+use futures::{Stream, StreamExt};
+use kuska_handshake::async_std::BoxStreamWrite;
+
+use tokio::sync::mpsc;
+
+use async_trait::async_trait;
+
+use crate::error::*;
+use crate::util::{AssociatedStream, Packet};
+
+/// Priority of a request (click to read more about priorities).
+///
+/// This priority value is used to priorize messages
+/// in the send queue of the client, and their responses in the send queue of the
+/// server. Lower values mean higher priority.
+///
+/// This mechanism is usefull for messages bigger than the maximum chunk size
+/// (set at `0x4000` bytes), such as large file transfers.
+/// In such case, all of the messages in the send queue with the highest priority
+/// will take turns to send individual chunks, in a round-robin fashion.
+/// Once all highest priority messages are sent successfully, the messages with
+/// the next highest priority will begin being sent in the same way.
+///
+/// The same priority value is given to a request and to its associated response.
+pub type RequestPriority = u8;
+
+/// Priority class: high
+pub const PRIO_HIGH: RequestPriority = 0x20;
+/// Priority class: normal
+pub const PRIO_NORMAL: RequestPriority = 0x40;
+/// Priority class: background
+pub const PRIO_BACKGROUND: RequestPriority = 0x80;
+/// Priority: primary among given class
+pub const PRIO_PRIMARY: RequestPriority = 0x00;
+/// Priority: secondary among given class (ex: `PRIO_HIGH | PRIO_SECONDARY`)
+pub const PRIO_SECONDARY: RequestPriority = 0x01;
+
+// Messages are sent by chunks
+// Chunk format:
+// - u32 BE: request id (same for request and response)
+// - u16 BE: chunk length, possibly with CHUNK_HAS_CONTINUATION flag
+//					when this is not the last chunk of the message
+// - [u8; chunk_length] chunk data
+
+pub(crate) type RequestID = u32;
+type ChunkLength = u16;
+const MAX_CHUNK_LENGTH: ChunkLength = 0x3FF0;
+const ERROR_MARKER: ChunkLength = 0x4000;
+const CHUNK_HAS_CONTINUATION: ChunkLength = 0x8000;
+
+struct SendQueueItem {
+	id: RequestID,
+	prio: RequestPriority,
+	data: DataReader,
+}
+
+#[pin_project::pin_project]
+struct DataReader {
+	#[pin]
+	reader: AssociatedStream,
+	packet: Packet,
+	pos: usize,
+	buf: Vec<u8>,
+	eos: bool,
+}
+
+impl From<AssociatedStream> for DataReader {
+	fn from(data: AssociatedStream) -> DataReader {
+		DataReader {
+			reader: data,
+			packet: Ok(Vec::new()),
+			pos: 0,
+			buf: Vec::with_capacity(MAX_CHUNK_LENGTH as usize),
+			eos: false,
+		}
+	}
+}
+
+enum DataFrame {
+	Data {
+		/// a fixed size buffer containing some data, possibly padded with 0s
+		data: [u8; MAX_CHUNK_LENGTH as usize],
+		/// actual lenght of data
+		len: usize,
+	},
+	Error(u8),
+}
+
+struct DataReaderItem {
+	data: DataFrame,
+	/// whethere there may be more data comming from this stream. Can be used for some
+	/// optimization. It's an error to set it to false if there is more data, but it is correct
+	/// (albeit sub-optimal) to set it to true if there is nothing coming after
+	may_have_more: bool,
+}
+
+impl DataReaderItem {
+	fn empty_last() -> Self {
+		DataReaderItem {
+			data: DataFrame::Data {
+				data: [0; MAX_CHUNK_LENGTH as usize],
+				len: 0,
+			},
+			may_have_more: false,
+		}
+	}
+
+	fn header(&self) -> [u8; 2] {
+		let continuation = if self.may_have_more {
+			CHUNK_HAS_CONTINUATION
+		} else {
+			0
+		};
+		let len = match self.data {
+			DataFrame::Data { len, .. } => len as u16,
+			DataFrame::Error(e) => e as u16 | ERROR_MARKER,
+		};
+
+		ChunkLength::to_be_bytes(len | continuation)
+	}
+
+	fn data(&self) -> &[u8] {
+		match self.data {
+			DataFrame::Data { ref data, len } => &data[..len],
+			DataFrame::Error(_) => &[],
+		}
+	}
+}
+
+impl Stream for DataReader {
+	type Item = DataReaderItem;
+
+	fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+		let mut this = self.project();
+
+		if *this.eos {
+			// eos was reached at previous call to poll_next, where a partial packet
+			// was returned. Now return None
+			return Poll::Ready(None);
+		}
+
+		loop {
+			let packet = match this.packet {
+				Ok(v) => v,
+				Err(e) => {
+					let e = *e;
+					*this.packet = Ok(Vec::new());
+					return Poll::Ready(Some(DataReaderItem {
+						data: DataFrame::Error(e),
+						may_have_more: true,
+					}));
+				}
+			};
+			let packet_left = packet.len() - *this.pos;
+			let buf_left = MAX_CHUNK_LENGTH as usize - this.buf.len();
+			let to_read = std::cmp::min(buf_left, packet_left);
+			this.buf
+				.extend_from_slice(&packet[*this.pos..*this.pos + to_read]);
+			*this.pos += to_read;
+			if this.buf.len() == MAX_CHUNK_LENGTH as usize {
+				// we have a full buf, ready to send
+				break;
+			}
+
+			// we don't have a full buf, packet is empty; try receive more
+			if let Some(p) = futures::ready!(this.reader.as_mut().poll_next(cx)) {
+				*this.packet = p;
+				*this.pos = 0;
+				// if buf is empty, we will loop and return the error directly. If buf
+				// isn't empty, send it before by breaking.
+				if this.packet.is_err() && !this.buf.is_empty() {
+					break;
+				}
+			} else {
+				*this.eos = true;
+				break;
+			}
+		}
+
+		let mut body = [0; MAX_CHUNK_LENGTH as usize];
+		let len = this.buf.len();
+		body[..len].copy_from_slice(this.buf);
+		this.buf.clear();
+		Poll::Ready(Some(DataReaderItem {
+			data: DataFrame::Data { data: body, len },
+			may_have_more: !*this.eos,
+		}))
+	}
+}
+
+struct SendQueue {
+	items: VecDeque<(u8, VecDeque<SendQueueItem>)>,
+}
+
+impl SendQueue {
+	fn new() -> Self {
+		Self {
+			items: VecDeque::with_capacity(64),
+		}
+	}
+	fn push(&mut self, item: SendQueueItem) {
+		let prio = item.prio;
+		let pos_prio = match self.items.binary_search_by(|(p, _)| p.cmp(&prio)) {
+			Ok(i) => i,
+			Err(i) => {
+				self.items.insert(i, (prio, VecDeque::new()));
+				i
+			}
+		};
+		self.items[pos_prio].1.push_back(item);
+	}
+	// used only in tests. They should probably be rewriten
+	#[allow(dead_code)]
+	fn pop(&mut self) -> Option<SendQueueItem> {
+		match self.items.pop_front() {
+			None => None,
+			Some((prio, mut items_at_prio)) => {
+				let ret = items_at_prio.pop_front();
+				if !items_at_prio.is_empty() {
+					self.items.push_front((prio, items_at_prio));
+				}
+				ret.or_else(|| self.pop())
+			}
+		}
+	}
+	fn is_empty(&self) -> bool {
+		self.items.iter().all(|(_k, v)| v.is_empty())
+	}
+
+	// this is like an async fn, but hand implemented
+	fn next_ready(&mut self) -> SendQueuePollNextReady<'_> {
+		SendQueuePollNextReady { queue: self }
+	}
+}
+
+struct SendQueuePollNextReady<'a> {
+	queue: &'a mut SendQueue,
+}
+
+impl<'a> futures::Future for SendQueuePollNextReady<'a> {
+	type Output = (RequestID, DataReaderItem);
+
+	fn poll(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<Self::Output> {
+		for i in 0..self.queue.items.len() {
+			let (_prio, items_at_prio) = &mut self.queue.items[i];
+
+			for _ in 0..items_at_prio.len() {
+				let mut item = items_at_prio.pop_front().unwrap();
+
+				match Pin::new(&mut item.data).poll_next(ctx) {
+					Poll::Pending => items_at_prio.push_back(item),
+					Poll::Ready(Some(data)) => {
+						let id = item.id;
+						if data.may_have_more {
+							self.queue.push(item);
+						} else {
+							if items_at_prio.is_empty() {
+								// this priority level is empty, remove it
+								self.queue.items.remove(i);
+							}
+						}
+						return Poll::Ready((id, data));
+					}
+					Poll::Ready(None) => {
+						if items_at_prio.is_empty() {
+							// this priority level is empty, remove it
+							self.queue.items.remove(i);
+						}
+						return Poll::Ready((item.id, DataReaderItem::empty_last()));
+					}
+				}
+			}
+		}
+		// TODO what do we do if self.queue is empty? We won't get scheduled again.
+		Poll::Pending
+	}
+}
+
+/// The SendLoop trait, which is implemented both by the client and the server
+/// connection objects (ServerConna and ClientConn) adds a method `.send_loop()`
+/// that takes a channel of messages to send and an asynchronous writer,
+/// and sends messages from the channel to the async writer, putting them in a queue
+/// before being sent and doing the round-robin sending strategy.
+///
+/// The `.send_loop()` exits when the sending end of the channel is closed,
+/// or if there is an error at any time writing to the async writer.
+#[async_trait]
+pub(crate) trait SendLoop: Sync {
+	async fn send_loop<W>(
+		self: Arc<Self>,
+		mut msg_recv: mpsc::UnboundedReceiver<(RequestID, RequestPriority, AssociatedStream)>,
+		mut write: BoxStreamWrite<W>,
+	) -> Result<(), Error>
+	where
+		W: AsyncWriteExt + Unpin + Send + Sync,
+	{
+		let mut sending = SendQueue::new();
+		let mut should_exit = false;
+		while !should_exit || !sending.is_empty() {
+			let recv_fut = msg_recv.recv();
+			futures::pin_mut!(recv_fut);
+			let send_fut = sending.next_ready();
+
+			// recv_fut is cancellation-safe according to tokio doc,
+			// send_fut is cancellation-safe as implemented above?
+			use futures::future::Either;
+			match futures::future::select(recv_fut, send_fut).await {
+				Either::Left((sth, _send_fut)) => {
+					if let Some((id, prio, data)) = sth {
+						sending.push(SendQueueItem {
+							id,
+							prio,
+							data: data.into(),
+						});
+					} else {
+						should_exit = true;
+					};
+				}
+				Either::Right(((id, data), _recv_fut)) => {
+					trace!("send_loop: sending bytes for {}", id);
+
+					let header_id = RequestID::to_be_bytes(id);
+					write.write_all(&header_id[..]).await?;
+
+					write.write_all(&data.header()).await?;
+					write.write_all(data.data()).await?;
+					write.flush().await?;
+				}
+			}
+		}
+
+		let _ = write.goodbye().await;
+		Ok(())
+	}
+}
+
+pub(crate) struct Framing {
+	direct: Vec<u8>,
+	stream: Option<AssociatedStream>,
+}
+
+impl Framing {
+	pub fn new(direct: Vec<u8>, stream: Option<AssociatedStream>) -> Self {
+		assert!(direct.len() <= u32::MAX as usize);
+		Framing { direct, stream }
+	}
+
+	pub fn into_stream(self) -> AssociatedStream {
+		use futures::stream;
+		let len = self.direct.len() as u32;
+		// required because otherwise the borrow-checker complains
+		let Framing { direct, stream } = self;
+
+		let res = stream::once(async move { Ok(u32::to_be_bytes(len).to_vec()) })
+			.chain(stream::once(async move { Ok(direct) }));
+
+		if let Some(stream) = stream {
+			Box::pin(res.chain(stream))
+		} else {
+			Box::pin(res)
+		}
+	}
+
+	pub async fn from_stream<S: Stream<Item = Packet> + Unpin + Send + 'static>(
+		mut stream: S,
+	) -> Result<Self, Error> {
+		let mut packet = stream
+			.next()
+			.await
+			.ok_or(Error::Framing)?
+			.map_err(|_| Error::Framing)?;
+		if packet.len() < 4 {
+			return Err(Error::Framing);
+		}
+
+		let mut len = [0; 4];
+		len.copy_from_slice(&packet[..4]);
+		let len = u32::from_be_bytes(len);
+		packet.drain(..4);
+
+		let mut buffer = Vec::new();
+		let len = len as usize;
+		loop {
+			let max_cp = std::cmp::min(len - buffer.len(), packet.len());
+
+			buffer.extend_from_slice(&packet[..max_cp]);
+			if buffer.len() == len {
+				packet.drain(..max_cp);
+				break;
+			}
+			packet = stream
+				.next()
+				.await
+				.ok_or(Error::Framing)?
+				.map_err(|_| Error::Framing)?;
+		}
+
+		let stream: AssociatedStream = if packet.is_empty() {
+			Box::pin(stream)
+		} else {
+			Box::pin(futures::stream::once(async move { Ok(packet) }).chain(stream))
+		};
+
+		Ok(Framing {
+			direct: buffer,
+			stream: Some(stream),
+		})
+	}
+
+	pub fn into_parts(self) -> (Vec<u8>, AssociatedStream) {
+		let Framing { direct, stream } = self;
+		(direct, stream.unwrap_or(Box::pin(futures::stream::empty())))
+	}
+}
+
+/// Structure to warn when the sender is dropped before end of stream was reached, like when
+/// connection to some remote drops while transmitting data
+struct Sender {
+	inner: UnboundedSender<Packet>,
+	closed: bool,
+}
+
+impl Sender {
+	fn new(inner: UnboundedSender<Packet>) -> Self {
+		Sender {
+			inner,
+			closed: false,
+		}
+	}
+
+	fn send(&self, packet: Packet) {
+		let _ = self.inner.unbounded_send(packet);
+	}
+
+	fn end(&mut self) {
+		self.closed = true;
+	}
+}
+
+impl Drop for Sender {
+	fn drop(&mut self) {
+		if !self.closed {
+			self.send(Err(255));
+		}
+		self.inner.close_channel();
+	}
+}
+
+/// The RecvLoop trait, which is implemented both by the client and the server
+/// connection objects (ServerConn and ClientConn) adds a method `.recv_loop()`
+/// and a prototype of a handler for received messages `.recv_handler()` that
+/// must be filled by implementors. `.recv_loop()` receives messages in a loop
+/// according to the protocol defined above: chunks of message in progress of being
+/// received are stored in a buffer, and when the last chunk of a message is received,
+/// the full message is passed to the receive handler.
+#[async_trait]
+pub(crate) trait RecvLoop: Sync + 'static {
+	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: UnboundedReceiver<Packet>);
+
+	async fn recv_loop<R>(self: Arc<Self>, mut read: R) -> Result<(), Error>
+	where
+		R: AsyncReadExt + Unpin + Send + Sync,
+	{
+		let mut streams: HashMap<RequestID, Sender> = HashMap::new();
+		loop {
+			trace!("recv_loop: reading packet");
+			let mut header_id = [0u8; RequestID::BITS as usize / 8];
+			match read.read_exact(&mut header_id[..]).await {
+				Ok(_) => (),
+				Err(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => break,
+				Err(e) => return Err(e.into()),
+			};
+			let id = RequestID::from_be_bytes(header_id);
+			trace!("recv_loop: got header id: {:04x}", id);
+
+			let mut header_size = [0u8; ChunkLength::BITS as usize / 8];
+			read.read_exact(&mut header_size[..]).await?;
+			let size = ChunkLength::from_be_bytes(header_size);
+			trace!("recv_loop: got header size: {:04x}", size);
+
+			let has_cont = (size & CHUNK_HAS_CONTINUATION) != 0;
+			let is_error = (size & ERROR_MARKER) != 0;
+			let packet = if is_error {
+				Err(size as u8)
+			} else {
+				let size = size & !CHUNK_HAS_CONTINUATION;
+				let mut next_slice = vec![0; size as usize];
+				read.read_exact(&mut next_slice[..]).await?;
+				trace!("recv_loop: read {} bytes", next_slice.len());
+				Ok(next_slice)
+			};
+
+			let mut sender = if let Some(send) = streams.remove(&(id)) {
+				send
+			} else {
+				let (send, recv) = unbounded();
+				self.recv_handler(id, recv);
+				Sender::new(send)
+			};
+
+			// if we get an error, the receiving end is disconnected. We still need to
+			// reach eos before dropping this sender
+			sender.send(packet);
+
+			if has_cont {
+				streams.insert(id, sender);
+			} else {
+				sender.end();
+			}
+		}
+		Ok(())
+	}
+}
+
+#[cfg(test)]
+mod test {
+	use super::*;
+
+	fn empty_data() -> DataReader {
+		type Item = Packet;
+		let stream: Pin<Box<dyn futures::Stream<Item = Item> + Send + 'static>> =
+			Box::pin(futures::stream::empty::<Packet>());
+		stream.into()
+	}
+
+	#[test]
+	fn test_priority_queue() {
+		let i1 = SendQueueItem {
+			id: 1,
+			prio: PRIO_NORMAL,
+			data: empty_data(),
+		};
+		let i2 = SendQueueItem {
+			id: 2,
+			prio: PRIO_HIGH,
+			data: empty_data(),
+		};
+		let i2bis = SendQueueItem {
+			id: 20,
+			prio: PRIO_HIGH,
+			data: empty_data(),
+		};
+		let i3 = SendQueueItem {
+			id: 3,
+			prio: PRIO_HIGH | PRIO_SECONDARY,
+			data: empty_data(),
+		};
+		let i4 = SendQueueItem {
+			id: 4,
+			prio: PRIO_BACKGROUND | PRIO_SECONDARY,
+			data: empty_data(),
+		};
+		let i5 = SendQueueItem {
+			id: 5,
+			prio: PRIO_BACKGROUND | PRIO_PRIMARY,
+			data: empty_data(),
+		};
+
+		let mut q = SendQueue::new();
+
+		q.push(i1); // 1
+		let a = q.pop().unwrap(); // empty -> 1
+		assert_eq!(a.id, 1);
+		assert!(q.pop().is_none());
+
+		q.push(a); // 1
+		q.push(i2); // 2 1
+		q.push(i2bis); // [2 20] 1
+		let a = q.pop().unwrap(); // 20 1 -> 2
+		assert_eq!(a.id, 2);
+		let b = q.pop().unwrap(); // 1 -> 20
+		assert_eq!(b.id, 20);
+		let c = q.pop().unwrap(); // empty -> 1
+		assert_eq!(c.id, 1);
+		assert!(q.pop().is_none());
+
+		q.push(a); // 2
+		q.push(b); // [2 20]
+		q.push(c); // [2 20] 1
+		q.push(i3); // [2 20] 3 1
+		q.push(i4); // [2 20] 3 1 4
+		q.push(i5); // [2 20] 3 1 5 4
+
+		let a = q.pop().unwrap(); // 20 3 1 5 4 -> 2
+		assert_eq!(a.id, 2);
+		q.push(a); // [20 2] 3 1 5 4
+
+		let a = q.pop().unwrap(); // 2 3 1 5 4 -> 20
+		assert_eq!(a.id, 20);
+		let b = q.pop().unwrap(); // 3 1 5 4 -> 2
+		assert_eq!(b.id, 2);
+		q.push(b); // 2 3 1 5 4
+		let b = q.pop().unwrap(); // 3 1 5 4 -> 2
+		assert_eq!(b.id, 2);
+		let c = q.pop().unwrap(); // 1 5 4 -> 3
+		assert_eq!(c.id, 3);
+		q.push(b); // 2 1 5 4
+		let b = q.pop().unwrap(); // 1 5 4 -> 2
+		assert_eq!(b.id, 2);
+		let e = q.pop().unwrap(); // 5 4 -> 1
+		assert_eq!(e.id, 1);
+		let f = q.pop().unwrap(); // 4 -> 5
+		assert_eq!(f.id, 5);
+		let g = q.pop().unwrap(); // empty -> 4
+		assert_eq!(g.id, 4);
+		assert!(q.pop().is_none());
+	}
+}

src/proto2.rs

@@ -0,0 +1,75 @@
+use crate::error::*;
+use crate::proto::*;
+
+pub(crate) struct QueryMessage<'a> {
+	pub(crate) prio: RequestPriority,
+	pub(crate) path: &'a [u8],
+	pub(crate) telemetry_id: Option<Vec<u8>>,
+	pub(crate) body: &'a [u8],
+}
+
+/// QueryMessage encoding:
+/// - priority: u8
+/// - path length: u8
+/// - path: [u8; path length]
+/// - telemetry id length: u8
+/// - telemetry id: [u8; telemetry id length]
+/// - body [u8; ..]
+impl<'a> QueryMessage<'a> {
+	pub(crate) fn encode(self) -> Vec<u8> {
+		let tel_len = match &self.telemetry_id {
+			Some(t) => t.len(),
+			None => 0,
+		};
+
+		let mut ret = Vec::with_capacity(10 + self.path.len() + tel_len + self.body.len());
+
+		ret.push(self.prio);
+
+		ret.push(self.path.len() as u8);
+		ret.extend_from_slice(self.path);
+
+		if let Some(t) = self.telemetry_id {
+			ret.push(t.len() as u8);
+			ret.extend(t);
+		} else {
+			ret.push(0u8);
+		}
+
+		ret.extend_from_slice(self.body);
+
+		ret
+	}
+
+	pub(crate) fn decode(bytes: &'a [u8]) -> Result<Self, Error> {
+		if bytes.len() < 3 {
+			return Err(Error::Message("Invalid protocol message".into()));
+		}
+
+		let path_length = bytes[1] as usize;
+		if bytes.len() < 3 + path_length {
+			return Err(Error::Message("Invalid protocol message".into()));
+		}
+
+		let telemetry_id_len = bytes[2 + path_length] as usize;
+		if bytes.len() < 3 + path_length + telemetry_id_len {
+			return Err(Error::Message("Invalid protocol message".into()));
+		}
+
+		let path = &bytes[2..2 + path_length];
+		let telemetry_id = if telemetry_id_len > 0 {
+			Some(bytes[3 + path_length..3 + path_length + telemetry_id_len].to_vec())
+		} else {
+			None
+		};
+
+		let body = &bytes[3 + path_length + telemetry_id_len..];
+
+		Ok(Self {
+			prio: bytes[0],
+			path,
+			telemetry_id,
+			body,
+		})
+	}
+}

src/recv.rs

@@ -1,153 +0,0 @@
-use std::collections::HashMap;
-use std::sync::Arc;
-
-use async_trait::async_trait;
-use bytes::Bytes;
-use log::*;
-
-use futures::AsyncReadExt;
-use tokio::sync::mpsc;
-
-use crate::error::*;
-use crate::send::*;
-use crate::stream::*;
-
-/// Structure to warn when the sender is dropped before end of stream was reached, like when
-/// connection to some remote drops while transmitting data
-struct Sender {
-	inner: Option<mpsc::UnboundedSender<Packet>>,
-}
-
-impl Sender {
-	fn new(inner: mpsc::UnboundedSender<Packet>) -> Self {
-		Sender { inner: Some(inner) }
-	}
-
-	fn send(&self, packet: Packet) {
-		let _ = self.inner.as_ref().unwrap().send(packet);
-	}
-
-	fn end(&mut self) {
-		self.inner = None;
-	}
-}
-
-impl Drop for Sender {
-	fn drop(&mut self) {
-		if let Some(inner) = self.inner.take() {
-			let _ = inner.send(Err(std::io::Error::new(
-				std::io::ErrorKind::BrokenPipe,
-				"Netapp connection dropped before end of stream",
-			)));
-		}
-	}
-}
-
-/// The RecvLoop trait, which is implemented both by the client and the server
-/// connection objects (ServerConn and ClientConn) adds a method `.recv_loop()`
-/// and a prototype of a handler for received messages `.recv_handler()` that
-/// must be filled by implementors. `.recv_loop()` receives messages in a loop
-/// according to the protocol defined above: chunks of message in progress of being
-/// received are stored in a buffer, and when the last chunk of a message is received,
-/// the full message is passed to the receive handler.
-#[async_trait]
-pub(crate) trait RecvLoop: Sync + 'static {
-	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: ByteStream);
-	fn cancel_handler(self: &Arc<Self>, _id: RequestID) {}
-
-	async fn recv_loop<R>(self: Arc<Self>, mut read: R, debug_name: String) -> Result<(), Error>
-	where
-		R: AsyncReadExt + Unpin + Send + Sync,
-	{
-		let mut streams: HashMap<RequestID, Sender> = HashMap::new();
-		loop {
-			trace!(
-				"recv_loop({}): in_progress = {:?}",
-				debug_name,
-				streams.iter().map(|(id, _)| id).collect::<Vec<_>>()
-			);
-
-			let mut header_id = [0u8; RequestID::BITS as usize / 8];
-			match read.read_exact(&mut header_id[..]).await {
-				Ok(_) => (),
-				Err(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => break,
-				Err(e) => return Err(e.into()),
-			};
-			let id = RequestID::from_be_bytes(header_id);
-
-			let mut header_size = [0u8; ChunkLength::BITS as usize / 8];
-			read.read_exact(&mut header_size[..]).await?;
-			let size = ChunkLength::from_be_bytes(header_size);
-
-			if size == CANCEL_REQUEST {
-				if let Some(mut stream) = streams.remove(&id) {
-					let _ = stream.send(Err(std::io::Error::new(
-						std::io::ErrorKind::Other,
-						"netapp: cancel requested",
-					)));
-					stream.end();
-				}
-				self.cancel_handler(id);
-				continue;
-			}
-
-			let has_cont = (size & CHUNK_FLAG_HAS_CONTINUATION) != 0;
-			let is_error = (size & CHUNK_FLAG_ERROR) != 0;
-			let size = (size & CHUNK_LENGTH_MASK) as usize;
-			let mut next_slice = vec![0; size as usize];
-			read.read_exact(&mut next_slice[..]).await?;
-
-			let packet = if is_error {
-				let kind = u8_to_io_errorkind(next_slice[0]);
-				let msg =
-					std::str::from_utf8(&next_slice[1..]).unwrap_or("<invalid utf8 error message>");
-				debug!(
-					"recv_loop({}): got id {}, error {:?}: {}",
-					debug_name, id, kind, msg
-				);
-				Some(Err(std::io::Error::new(kind, msg.to_string())))
-			} else {
-				trace!(
-					"recv_loop({}): got id {}, size {}, has_cont {}",
-					debug_name,
-					id,
-					size,
-					has_cont
-				);
-				if !next_slice.is_empty() {
-					Some(Ok(Bytes::from(next_slice)))
-				} else {
-					None
-				}
-			};
-
-			let mut sender = if let Some(send) = streams.remove(&(id)) {
-				send
-			} else {
-				let (send, recv) = mpsc::unbounded_channel();
-				trace!("recv_loop({}): id {} is new channel", debug_name, id);
-				self.recv_handler(
-					id,
-					Box::pin(tokio_stream::wrappers::UnboundedReceiverStream::new(recv)),
-				);
-				Sender::new(send)
-			};
-
-			if let Some(packet) = packet {
-				// If we cannot put packet in channel, it means that the
-				// receiving end of the channel is disconnected.
-				// We still need to reach eos before dropping this sender
-				let _ = sender.send(packet);
-			}
-
-			if has_cont {
-				assert!(!is_error);
-				streams.insert(id, sender);
-			} else {
-				trace!("recv_loop({}): close channel id {}", debug_name, id);
-				sender.end();
-			}
-		}
-		Ok(())
-	}
-}

src/send.rs

@@ -1,356 +0,0 @@
-use std::collections::{HashMap, VecDeque};
-use std::pin::Pin;
-use std::sync::Arc;
-use std::task::{Context, Poll};
-
-use async_trait::async_trait;
-use bytes::{BufMut, Bytes, BytesMut};
-use log::*;
-
-use futures::{AsyncWriteExt, Future};
-use kuska_handshake::async_std::BoxStreamWrite;
-use tokio::sync::mpsc;
-
-use crate::error::*;
-use crate::message::*;
-use crate::stream::*;
-
-// Messages are sent by chunks
-// Chunk format:
-// - u32 BE: request id (same for request and response)
-// - u16 BE: chunk length + flags:
-//		CHUNK_FLAG_HAS_CONTINUATION when this is not the last chunk of the stream
-//		CHUNK_FLAG_ERROR if this chunk denotes an error
-//		(these two flags are exclusive, an error denotes the end of the stream)
-//		**special value** 0xFFFF indicates a CANCEL message
-// - [u8; chunk_length], either
-//   - if not error: chunk data
-//   - if error:
-//       - u8: error kind, encoded using error::io_errorkind_to_u8
-//       - rest: error message
-//   - absent for cancel messag
-
-pub(crate) type RequestID = u32;
-pub(crate) type ChunkLength = u16;
-
-pub(crate) const MAX_CHUNK_LENGTH: ChunkLength = 0x3FF0;
-pub(crate) const CHUNK_FLAG_ERROR: ChunkLength = 0x4000;
-pub(crate) const CHUNK_FLAG_HAS_CONTINUATION: ChunkLength = 0x8000;
-pub(crate) const CHUNK_LENGTH_MASK: ChunkLength = 0x3FFF;
-pub(crate) const CANCEL_REQUEST: ChunkLength = 0xFFFF;
-
-pub(crate) enum SendItem {
-	Stream(RequestID, RequestPriority, Option<OrderTag>, ByteStream),
-	Cancel(RequestID),
-}
-
-// ----
-
-struct SendQueue {
-	items: Vec<(u8, SendQueuePriority)>,
-}
-
-struct SendQueuePriority {
-	items: VecDeque<SendQueueItem>,
-	order: HashMap<u64, VecDeque<u64>>,
-}
-
-struct SendQueueItem {
-	id: RequestID,
-	prio: RequestPriority,
-	order_tag: Option<OrderTag>,
-	data: ByteStreamReader,
-	sent: usize,
-}
-
-impl SendQueue {
-	fn new() -> Self {
-		Self {
-			items: Vec::with_capacity(64),
-		}
-	}
-	fn push(&mut self, item: SendQueueItem) {
-		let prio = item.prio;
-		let pos_prio = match self.items.binary_search_by(|(p, _)| p.cmp(&prio)) {
-			Ok(i) => i,
-			Err(i) => {
-				self.items.insert(i, (prio, SendQueuePriority::new()));
-				i
-			}
-		};
-		self.items[pos_prio].1.push(item);
-	}
-	fn remove(&mut self, id: RequestID) {
-		for (_, prioq) in self.items.iter_mut() {
-			prioq.remove(id);
-		}
-		self.items.retain(|(_prio, q)| !q.is_empty());
-	}
-	fn is_empty(&self) -> bool {
-		self.items.iter().all(|(_k, v)| v.is_empty())
-	}
-
-	// this is like an async fn, but hand implemented
-	fn next_ready(&mut self) -> SendQueuePollNextReady<'_> {
-		SendQueuePollNextReady { queue: self }
-	}
-}
-
-impl SendQueuePriority {
-	fn new() -> Self {
-		Self {
-			items: VecDeque::new(),
-			order: HashMap::new(),
-		}
-	}
-	fn push(&mut self, item: SendQueueItem) {
-		if let Some(OrderTag(stream, order)) = item.order_tag {
-			let order_vec = self.order.entry(stream).or_default();
-			let i = order_vec.iter().take_while(|o2| **o2 < order).count();
-			order_vec.insert(i, order);
-		}
-		self.items.push_front(item);
-	}
-	fn remove(&mut self, id: RequestID) {
-		if let Some(i) = self.items.iter().position(|x| x.id == id) {
-			let item = self.items.remove(i).unwrap();
-			if let Some(OrderTag(stream, order)) = item.order_tag {
-				let order_vec = self.order.get_mut(&stream).unwrap();
-				let j = order_vec.iter().position(|x| *x == order).unwrap();
-				order_vec.remove(j).unwrap();
-				if order_vec.is_empty() {
-					self.order.remove(&stream);
-				}
-			}
-		}
-	}
-	fn is_empty(&self) -> bool {
-		self.items.is_empty()
-	}
-	fn poll_next_ready(&mut self, ctx: &mut Context<'_>) -> Poll<(RequestID, DataFrame)> {
-		for (j, item) in self.items.iter_mut().enumerate() {
-			if let Some(OrderTag(stream, order)) = item.order_tag {
-				if order > *self.order.get(&stream).unwrap().front().unwrap() {
-					continue;
-				}
-			}
-
-			let mut item_reader = item.data.read_exact_or_eos(MAX_CHUNK_LENGTH as usize);
-			if let Poll::Ready(bytes_or_err) = Pin::new(&mut item_reader).poll(ctx) {
-				let id = item.id;
-				let eos = item.data.eos();
-
-				let packet = bytes_or_err.map_err(|e| match e {
-					ReadExactError::Stream(err) => err,
-					_ => unreachable!(),
-				});
-
-				let is_err = packet.is_err();
-				let data_frame = DataFrame::from_packet(packet, !eos);
-				item.sent += data_frame.data().len();
-
-				if eos || is_err {
-					// If item had an order tag, remove it from the corresponding ordering list
-					if let Some(OrderTag(stream, order)) = item.order_tag {
-						let order_stream = self.order.get_mut(&stream).unwrap();
-						assert_eq!(order_stream.pop_front(), Some(order));
-						if order_stream.is_empty() {
-							self.order.remove(&stream);
-						}
-					}
-					// Remove item from sending queue
-					self.items.remove(j);
-				} else {
-					// Move item later in send queue to implement LAS scheduling
-					// (LAS = Least Attained Service)
-					for k in j..self.items.len() - 1 {
-						if self.items[k].sent >= self.items[k + 1].sent {
-							self.items.swap(k, k + 1);
-						} else {
-							break;
-						}
-					}
-				}
-
-				return Poll::Ready((id, data_frame));
-			}
-		}
-
-		Poll::Pending
-	}
-	fn dump(&self, prio: u8) -> String {
-		self.items
-			.iter()
-			.map(|i| format!("[{} {} {:?} @{}]", prio, i.id, i.order_tag, i.sent))
-			.collect::<Vec<_>>()
-			.join(" ")
-	}
-}
-
-struct SendQueuePollNextReady<'a> {
-	queue: &'a mut SendQueue,
-}
-
-impl<'a> futures::Future for SendQueuePollNextReady<'a> {
-	type Output = (RequestID, DataFrame);
-
-	fn poll(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<Self::Output> {
-		for (i, (_prio, items_at_prio)) in self.queue.items.iter_mut().enumerate() {
-			if let Poll::Ready(res) = items_at_prio.poll_next_ready(ctx) {
-				if items_at_prio.is_empty() {
-					self.queue.items.remove(i);
-				}
-				return Poll::Ready(res);
-			}
-		}
-		// If the queue is empty, this futures is eternally pending.
-		// This is ok because we use it in a select with another future
-		// that can interrupt it.
-		Poll::Pending
-	}
-}
-
-enum DataFrame {
-	/// a fixed size buffer containing some data + a boolean indicating whether
-	/// there may be more data comming from this stream. Can be used for some
-	/// optimization. It's an error to set it to false if there is more data, but it is correct
-	/// (albeit sub-optimal) to set it to true if there is nothing coming after
-	Data(Bytes, bool),
-	/// An error code automatically signals the end of the stream
-	Error(Bytes),
-}
-
-impl DataFrame {
-	fn from_packet(p: Packet, has_cont: bool) -> Self {
-		match p {
-			Ok(bytes) => {
-				assert!(bytes.len() <= MAX_CHUNK_LENGTH as usize);
-				Self::Data(bytes, has_cont)
-			}
-			Err(e) => {
-				let mut buf = BytesMut::new();
-				buf.put_u8(io_errorkind_to_u8(e.kind()));
-
-				let msg = format!("{}", e).into_bytes();
-				if msg.len() > (MAX_CHUNK_LENGTH - 1) as usize {
-					buf.put(&msg[..(MAX_CHUNK_LENGTH - 1) as usize]);
-				} else {
-					buf.put(&msg[..]);
-				}
-
-				Self::Error(buf.freeze())
-			}
-		}
-	}
-
-	fn header(&self) -> [u8; 2] {
-		let header_u16 = match self {
-			DataFrame::Data(data, false) => data.len() as u16,
-			DataFrame::Data(data, true) => data.len() as u16 | CHUNK_FLAG_HAS_CONTINUATION,
-			DataFrame::Error(msg) => msg.len() as u16 | CHUNK_FLAG_ERROR,
-		};
-		ChunkLength::to_be_bytes(header_u16)
-	}
-
-	fn data(&self) -> &[u8] {
-		match self {
-			DataFrame::Data(ref data, _) => &data[..],
-			DataFrame::Error(ref msg) => &msg[..],
-		}
-	}
-}
-
-/// The SendLoop trait, which is implemented both by the client and the server
-/// connection objects (ServerConna and ClientConn) adds a method `.send_loop()`
-/// that takes a channel of messages to send and an asynchronous writer,
-/// and sends messages from the channel to the async writer, putting them in a queue
-/// before being sent and doing the round-robin sending strategy.
-///
-/// The `.send_loop()` exits when the sending end of the channel is closed,
-/// or if there is an error at any time writing to the async writer.
-#[async_trait]
-pub(crate) trait SendLoop: Sync {
-	async fn send_loop<W>(
-		self: Arc<Self>,
-		msg_recv: mpsc::UnboundedReceiver<SendItem>,
-		mut write: BoxStreamWrite<W>,
-		debug_name: String,
-	) -> Result<(), Error>
-	where
-		W: AsyncWriteExt + Unpin + Send + Sync,
-	{
-		let mut sending = SendQueue::new();
-		let mut msg_recv = Some(msg_recv);
-		while msg_recv.is_some() || !sending.is_empty() {
-			trace!(
-				"send_loop({}): queue = {:?}",
-				debug_name,
-				sending
-					.items
-					.iter()
-					.map(|(prio, i)| i.dump(*prio))
-					.collect::<Vec<_>>()
-					.join(" ; ")
-			);
-
-			let recv_fut = async {
-				if let Some(chan) = &mut msg_recv {
-					chan.recv().await
-				} else {
-					futures::future::pending().await
-				}
-			};
-			let send_fut = sending.next_ready();
-
-			// recv_fut is cancellation-safe according to tokio doc,
-			// send_fut is cancellation-safe as implemented above?
-			tokio::select! {
-				biased;	// always read incomming channel first if it has data
-				sth = recv_fut => {
-					match sth {
-						Some(SendItem::Stream(id, prio, order_tag, data)) => {
-							trace!("send_loop({}): add stream {} to send", debug_name, id);
-							sending.push(SendQueueItem {
-								id,
-								prio,
-								order_tag,
-								data: ByteStreamReader::new(data),
-								sent: 0,
-							})
-						}
-						Some(SendItem::Cancel(id)) => {
-							trace!("send_loop({}): cancelling {}", debug_name, id);
-							sending.remove(id);
-							let header_id = RequestID::to_be_bytes(id);
-							write.write_all(&header_id[..]).await?;
-							write.write_all(&ChunkLength::to_be_bytes(CANCEL_REQUEST)).await?;
-							write.flush().await?;
-						}
-						None => {
-							msg_recv = None;
-						}
-					};
-				}
-				(id, data) = send_fut => {
-					trace!(
-						"send_loop({}): id {}, send {} bytes, header_size {}",
-						debug_name,
-						id,
-						data.data().len(),
-						hex::encode(data.header())
-					);
-
-					let header_id = RequestID::to_be_bytes(id);
-					write.write_all(&header_id[..]).await?;
-
-					write.write_all(&data.header()).await?;
-					write.write_all(data.data()).await?;
-					write.flush().await?;
-				}
-			}
-		}
-
-		let _ = write.goodbye().await;
-		Ok(())
-	}
-}

src/server.rs

@@ -1,17 +1,8 @@
-use std::collections::HashMap;
 use std::net::SocketAddr;
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 
 use arc_swap::ArcSwapOption;
-use async_trait::async_trait;
+use log::{debug, trace};
-use log::*;
-
-use futures::io::{AsyncReadExt, AsyncWriteExt};
-use kuska_handshake::async_std::{handshake_server, BoxStream};
-use tokio::net::TcpStream;
-use tokio::select;
-use tokio::sync::{mpsc, watch};
-use tokio_util::compat::*;
 
 #[cfg(feature = "telemetry")]
 use opentelemetry::{
@@ -23,12 +14,22 @@ use opentelemetry_contrib::trace::propagator::binary::*;
 #[cfg(feature = "telemetry")]
 use rand::{thread_rng, Rng};
 
+use tokio::net::TcpStream;
+use tokio::select;
+use tokio::sync::{mpsc, watch};
+use tokio_util::compat::*;
+
+use futures::channel::mpsc::UnboundedReceiver;
+use futures::io::{AsyncReadExt, AsyncWriteExt};
+
+use async_trait::async_trait;
+
+use kuska_handshake::async_std::{handshake_server, BoxStream};
+
 use crate::error::*;
-use crate::message::*;
 use crate::netapp::*;
-use crate::recv::*;
+use crate::proto::*;
-use crate::send::*;
+use crate::proto2::*;
-use crate::stream::*;
 use crate::util::*;
 
 // The client and server connection structs (client.rs and server.rs)
@@ -54,8 +55,7 @@ pub(crate) struct ServerConn {
 
 	netapp: Arc<NetApp>,
 
-	resp_send: ArcSwapOption<mpsc::UnboundedSender<SendItem>>,
+	resp_send: ArcSwapOption<mpsc::UnboundedSender<(RequestID, RequestPriority, AssociatedStream)>>,
-	running_handlers: Mutex<HashMap<RequestID, tokio::task::JoinHandle<()>>>,
 }
 
 impl ServerConn {
@@ -79,7 +79,7 @@ impl ServerConn {
 
 		debug!(
 			"Handshake complete (server) with {}@{}",
-			hex::encode(peer_id),
+			hex::encode(&peer_id),
 			remote_addr
 		);
 
@@ -101,22 +101,18 @@ impl ServerConn {
 			remote_addr,
 			peer_id,
 			resp_send: ArcSwapOption::new(Some(Arc::new(resp_send))),
-			running_handlers: Mutex::new(HashMap::new()),
 		});
 
 		netapp.connected_as_server(peer_id, conn.clone());
 
-		let debug_name = format!("SRV {}", hex::encode(&peer_id[..8]));
-		let debug_name_2 = debug_name.clone();
-
 		let conn2 = conn.clone();
 		let recv_future = tokio::spawn(async move {
 			select! {
-				r = conn2.recv_loop(read, debug_name_2) => r,
+				r = conn2.recv_loop(read) => r,
 				_ = await_exit(must_exit) => Ok(())
 			}
 		});
-		let send_future = tokio::spawn(conn.clone().send_loop(resp_recv, write, debug_name));
+		let send_future = tokio::spawn(conn.clone().send_loop(resp_recv, write));
 
 		recv_future.await.log_err("ServerConn recv_loop");
 		conn.resp_send.store(None);
@@ -127,8 +123,13 @@ impl ServerConn {
 		Ok(())
 	}
 
-	async fn recv_handler_aux(self: &Arc<Self>, req_enc: ReqEnc) -> Result<RespEnc, Error> {
+	async fn recv_handler_aux(
-		let path = String::from_utf8(req_enc.path.to_vec())?;
+		self: &Arc<Self>,
+		bytes: &[u8],
+		stream: AssociatedStream,
+	) -> Result<(Vec<u8>, Option<AssociatedStream>), Error> {
+		let msg = QueryMessage::decode(bytes)?;
+		let path = String::from_utf8(msg.path.to_vec())?;
 
 		let handler_opt = {
 			let endpoints = self.netapp.endpoints.read().unwrap();
@@ -140,9 +141,9 @@ impl ServerConn {
 				if #[cfg(feature = "telemetry")] {
 					let tracer = opentelemetry::global::tracer("netapp");
 
-					let mut span = if !req_enc.telemetry_id.is_empty() {
+					let mut span = if let Some(telemetry_id) = msg.telemetry_id {
 						let propagator = BinaryPropagator::new();
-						let context = propagator.from_bytes(req_enc.telemetry_id.to_vec());
+						let context = propagator.from_bytes(telemetry_id);
 						let context = Context::new().with_remote_span_context(context);
 						tracer.span_builder(format!(">> RPC {}", path))
 							.with_kind(SpanKind::Server)
@@ -157,13 +158,13 @@ impl ServerConn {
 							.start(&tracer)
 					};
 					span.set_attribute(KeyValue::new("path", path.to_string()));
-					span.set_attribute(KeyValue::new("len_query_msg", req_enc.msg.len() as i64));
+					span.set_attribute(KeyValue::new("len_query", msg.body.len() as i64));
 
-					handler.handle(req_enc, self.peer_id)
+					handler.handle(msg.body, stream, self.peer_id)
 						.with_context(Context::current_with_span(span))
 						.await
 				} else {
-					handler.handle(req_enc, self.peer_id).await
+					handler.handle(msg.body, stream, self.peer_id).await
 				}
 			}
 		} else {
@@ -176,47 +177,40 @@ impl SendLoop for ServerConn {}
 
 #[async_trait]
 impl RecvLoop for ServerConn {
-	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: ByteStream) {
+	fn recv_handler(self: &Arc<Self>, id: RequestID, stream: UnboundedReceiver<Packet>) {
-		let resp_send = match self.resp_send.load_full() {
+		let resp_send = self.resp_send.load_full().unwrap();
-			Some(c) => c,
-			None => return,
-		};
-
-		let mut rh = self.running_handlers.lock().unwrap();
 
 		let self2 = self.clone();
-		let jh = tokio::spawn(async move {
+		tokio::spawn(async move {
-			debug!("server: recv_handler got {}", id);
+			trace!("ServerConn recv_handler {}", id);
+			let (bytes, stream) = Framing::from_stream(stream).await?.into_parts();
 
-			let (prio, resp_enc_result) = match ReqEnc::decode(stream).await {
+			let prio = if !bytes.is_empty() { bytes[0] } else { 0u8 };
-				Ok(req_enc) => (req_enc.prio, self2.recv_handler_aux(req_enc).await),
+			let resp = self2.recv_handler_aux(&bytes[..], stream).await;
-				Err(e) => (PRIO_HIGH, Err(e)),
+
+			let (resp_bytes, resp_stream) = match resp {
+				Ok((rb, rs)) => {
+					let mut resp_bytes = vec![0u8];
+					resp_bytes.extend(rb);
+					(resp_bytes, rs)
+				}
+				Err(e) => {
+					let mut resp_bytes = vec![e.code()];
+					resp_bytes.extend(e.to_string().into_bytes());
+					(resp_bytes, None)
+				}
 			};
 
-			debug!("server: sending response to {}", id);
+			trace!("ServerConn sending response to {}: ", id);
 
-			let (resp_stream, resp_order) = RespEnc::encode(resp_enc_result);
 			resp_send
-				.send(SendItem::Stream(id, prio, resp_order, resp_stream))
+				.send((
+					id,
+					prio,
+					Framing::new(resp_bytes, resp_stream).into_stream(),
+				))
 				.log_err("ServerConn recv_handler send resp bytes");
-
+			Ok::<_, Error>(())
-			self2.running_handlers.lock().unwrap().remove(&id);
 		});
-
-		rh.insert(id, jh);
-	}
-
-	fn cancel_handler(self: &Arc<Self>, id: RequestID) {
-		trace!("received cancel for request {}", id);
-
-		// If the handler is still running, abort it now
-		if let Some(jh) = self.running_handlers.lock().unwrap().remove(&id) {
-			jh.abort();
-		}
-
-		// Inform the response sender that we don't need to send the response
-		if let Some(resp_send) = self.resp_send.load_full() {
-			let _ = resp_send.send(SendItem::Cancel(id));
-		}
 	}
 }

src/stream.rs

@@ -1,202 +0,0 @@
-use std::pin::Pin;
-use std::task::{Context, Poll};
-
-use bytes::Bytes;
-
-use futures::Future;
-use futures::{Stream, StreamExt};
-use tokio::io::AsyncRead;
-
-use crate::bytes_buf::BytesBuf;
-
-/// A stream of bytes (click to read more).
-///
-/// When sent through Netapp, the Vec may be split in smaller chunk in such a way
-/// consecutive Vec may get merged, but Vec and error code may not be reordered
-///
-/// Items sent in the ByteStream may be errors of type `std::io::Error`.
-/// An error indicates the end of the ByteStream: a reader should no longer read
-/// after recieving an error, and a writer should stop writing after sending an error.
-pub type ByteStream = Pin<Box<dyn Stream<Item = Packet> + Send + Sync>>;
-
-/// A packet sent in a ByteStream, which may contain either
-/// a Bytes object or an error
-pub type Packet = Result<Bytes, std::io::Error>;
-
-// ----
-
-/// A helper struct to read defined lengths of data from a BytesStream
-pub struct ByteStreamReader {
-	stream: ByteStream,
-	buf: BytesBuf,
-	eos: bool,
-	err: Option<std::io::Error>,
-}
-
-impl ByteStreamReader {
-	/// Creates a new `ByteStreamReader` from a `ByteStream`
-	pub fn new(stream: ByteStream) -> Self {
-		ByteStreamReader {
-			stream,
-			buf: BytesBuf::new(),
-			eos: false,
-			err: None,
-		}
-	}
-
-	/// Read exactly `read_len` bytes from the underlying stream
-	/// (returns a future)
-	pub fn read_exact(&mut self, read_len: usize) -> ByteStreamReadExact<'_> {
-		ByteStreamReadExact {
-			reader: self,
-			read_len,
-			fail_on_eos: true,
-		}
-	}
-
-	/// Read at most `read_len` bytes from the underlying stream, or less
-	/// if the end of the stream is reached (returns a future)
-	pub fn read_exact_or_eos(&mut self, read_len: usize) -> ByteStreamReadExact<'_> {
-		ByteStreamReadExact {
-			reader: self,
-			read_len,
-			fail_on_eos: false,
-		}
-	}
-
-	/// Read exactly one byte from the underlying stream and returns it
-	/// as an u8
-	pub async fn read_u8(&mut self) -> Result<u8, ReadExactError> {
-		Ok(self.read_exact(1).await?[0])
-	}
-
-	/// Read exactly two bytes from the underlying stream and returns them as an u16 (using
-	/// big-endian decoding)
-	pub async fn read_u16(&mut self) -> Result<u16, ReadExactError> {
-		let bytes = self.read_exact(2).await?;
-		let mut b = [0u8; 2];
-		b.copy_from_slice(&bytes[..]);
-		Ok(u16::from_be_bytes(b))
-	}
-
-	/// Read exactly four bytes from the underlying stream and returns them as an u32 (using
-	/// big-endian decoding)
-	pub async fn read_u32(&mut self) -> Result<u32, ReadExactError> {
-		let bytes = self.read_exact(4).await?;
-		let mut b = [0u8; 4];
-		b.copy_from_slice(&bytes[..]);
-		Ok(u32::from_be_bytes(b))
-	}
-
-	/// Transforms the stream reader back into the underlying stream (starting
-	/// after everything that the reader has read)
-	pub fn into_stream(self) -> ByteStream {
-		let buf_stream = futures::stream::iter(self.buf.into_slices().into_iter().map(Ok));
-		if let Some(err) = self.err {
-			Box::pin(buf_stream.chain(futures::stream::once(async move { Err(err) })))
-		} else if self.eos {
-			Box::pin(buf_stream)
-		} else {
-			Box::pin(buf_stream.chain(self.stream))
-		}
-	}
-
-	/// Tries to fill the internal read buffer from the underlying stream if it is empty.
-	/// Calling this might be necessary to ensure that `.eos()` returns a correct
-	/// result, otherwise the reader might not be aware that the underlying
-	/// stream has nothing left to return.
-	pub async fn fill_buffer(&mut self) {
-		if self.buf.is_empty() {
-			let packet = self.stream.next().await;
-			self.add_stream_next(packet);
-		}
-	}
-
-	/// Clears the internal read buffer and returns its content
-	pub fn take_buffer(&mut self) -> Bytes {
-		self.buf.take_all()
-	}
-
-	/// Returns true if the end of the underlying stream has been reached
-	pub fn eos(&self) -> bool {
-		self.buf.is_empty() && self.eos
-	}
-
-	fn try_get(&mut self, read_len: usize) -> Option<Bytes> {
-		self.buf.take_exact(read_len)
-	}
-
-	fn add_stream_next(&mut self, packet: Option<Packet>) {
-		match packet {
-			Some(Ok(slice)) => {
-				self.buf.extend(slice);
-			}
-			Some(Err(e)) => {
-				self.err = Some(e);
-				self.eos = true;
-			}
-			None => {
-				self.eos = true;
-			}
-		}
-	}
-}
-
-/// The error kind that can be returned by `ByteStreamReader::read_exact` and
-/// `ByteStreamReader::read_exact_or_eos`
-pub enum ReadExactError {
-	/// The end of the stream was reached before the requested number of bytes could be read
-	UnexpectedEos,
-	/// The underlying data stream returned an IO error when trying to read
-	Stream(std::io::Error),
-}
-
-/// The future returned by `ByteStreamReader::read_exact` and
-/// `ByteStreamReader::read_exact_or_eos`
-#[pin_project::pin_project]
-pub struct ByteStreamReadExact<'a> {
-	#[pin]
-	reader: &'a mut ByteStreamReader,
-	read_len: usize,
-	fail_on_eos: bool,
-}
-
-impl<'a> Future for ByteStreamReadExact<'a> {
-	type Output = Result<Bytes, ReadExactError>;
-
-	fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<Bytes, ReadExactError>> {
-		let mut this = self.project();
-
-		loop {
-			if let Some(bytes) = this.reader.try_get(*this.read_len) {
-				return Poll::Ready(Ok(bytes));
-			}
-			if let Some(err) = &this.reader.err {
-				let err = std::io::Error::new(err.kind(), format!("{}", err));
-				return Poll::Ready(Err(ReadExactError::Stream(err)));
-			}
-			if this.reader.eos {
-				if *this.fail_on_eos {
-					return Poll::Ready(Err(ReadExactError::UnexpectedEos));
-				} else {
-					return Poll::Ready(Ok(this.reader.take_buffer()));
-				}
-			}
-
-			let next_packet = futures::ready!(this.reader.stream.as_mut().poll_next(cx));
-			this.reader.add_stream_next(next_packet);
-		}
-	}
-}
-
-// ----
-
-/// Turns a `tokio::io::AsyncRead` asynchronous reader into a `ByteStream`
-pub fn asyncread_stream<R: AsyncRead + Send + Sync + 'static>(reader: R) -> ByteStream {
-	Box::pin(tokio_util::io::ReaderStream::new(reader))
-}
-
-/// Turns a `ByteStream` into a `tokio::io::AsyncRead` asynchronous reader
-pub fn stream_asyncread(stream: ByteStream) -> impl AsyncRead + Send + Sync + 'static {
-	tokio_util::io::StreamReader::new(stream)
-}

src/test.rs

@@ -14,7 +14,7 @@ use crate::NodeID;
 
 #[tokio::test(flavor = "current_thread")]
 async fn test_with_basic_scheduler() {
-	env_logger::init();
+	pretty_env_logger::init();
 	run_test().await
 }
 

src/util.rs

@@ -1,25 +1,54 @@
+use crate::endpoint::SerializeMessage;
+
 use std::net::SocketAddr;
+use std::net::ToSocketAddrs;
+use std::pin::Pin;
+
+use futures::Stream;
 
 use log::info;
+
 use serde::Serialize;
 
 use tokio::sync::watch;
 
-use crate::netapp::*;
+/// A node's identifier, which is also its public cryptographic key
+pub type NodeID = sodiumoxide::crypto::sign::ed25519::PublicKey;
+/// A node's secret key
+pub type NodeKey = sodiumoxide::crypto::sign::ed25519::SecretKey;
+/// A network key
+pub type NetworkKey = sodiumoxide::crypto::auth::Key;
+
+/// A stream of associated data.
+///
+/// The Stream can continue after receiving an error.
+/// When sent through Netapp, the Vec may be split in smaller chunk in such a way
+/// consecutive Vec may get merged, but Vec and error code may not be reordered
+///
+/// Error code 255 means the stream was cut before its end. Other codes have no predefined
+/// meaning, it's up to your application to define their semantic.
+pub type AssociatedStream = Pin<Box<dyn Stream<Item = Packet> + Send>>;
+
+pub type Packet = Result<Vec<u8>, u8>;
 
 /// Utility function: encodes any serializable value in MessagePack binary format
 /// using the RMP library.
 ///
 /// Field names and variant names are included in the serialization.
 /// This is used internally by the netapp communication protocol.
-pub fn rmp_to_vec_all_named<T>(val: &T) -> Result<Vec<u8>, rmp_serde::encode::Error>
+pub fn rmp_to_vec_all_named<T>(
+	val: &T,
+) -> Result<(Vec<u8>, Option<AssociatedStream>), rmp_serde::encode::Error>
 where
-	T: Serialize + ?Sized,
+	T: SerializeMessage + ?Sized,
 {
 	let mut wr = Vec::with_capacity(128);
-	let mut se = rmp_serde::Serializer::new(&mut wr).with_struct_map();
+	let mut se = rmp_serde::Serializer::new(&mut wr)
+		.with_struct_map()
+		.with_string_variants();
+	let (val, stream) = val.serialize_msg();
 	val.serialize(&mut se)?;
-	Ok(wr)
+	Ok((wr, stream))
 }
 
 /// This async function returns only when a true signal was received
@@ -60,7 +89,7 @@ pub fn watch_ctrl_c() -> watch::Receiver<bool> {
 pub fn parse_peer_addr(peer: &str) -> Option<(NodeID, SocketAddr)> {
 	let delim = peer.find('@')?;
 	let (key, ip) = peer.split_at(delim);
-	let pubkey = NodeID::from_slice(&hex::decode(key).ok()?)?;
+	let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
 	let ip = ip[1..].parse::<SocketAddr>().ok()?;
 	Some((pubkey, ip))
 }
@@ -68,29 +97,12 @@ pub fn parse_peer_addr(peer: &str) -> Option<(NodeID, SocketAddr)> {
 /// Parse and resolve a peer's address including public key, written in the format:
 /// `<public key hex>@<ip or hostname>:<port>`
 pub fn parse_and_resolve_peer_addr(peer: &str) -> Option<(NodeID, Vec<SocketAddr>)> {
-	use std::net::ToSocketAddrs;
-
 	let delim = peer.find('@')?;
 	let (key, host) = peer.split_at(delim);
-	let pubkey = NodeID::from_slice(&hex::decode(key).ok()?)?;
+	let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
 	let hosts = host[1..].to_socket_addrs().ok()?.collect::<Vec<_>>();
 	if hosts.is_empty() {
 		return None;
 	}
 	Some((pubkey, hosts))
 }
-
-/// async version of parse_and_resolve_peer_addr
-pub async fn parse_and_resolve_peer_addr_async(peer: &str) -> Option<(NodeID, Vec<SocketAddr>)> {
-	let delim = peer.find('@')?;
-	let (key, host) = peer.split_at(delim);
-	let pubkey = NodeID::from_slice(&hex::decode(key).ok()?)?;
-	let hosts = tokio::net::lookup_host(&host[1..])
-		.await
-		.ok()?
-		.collect::<Vec<_>>();
-	if hosts.is_empty() {
-		return None;
-	}
-	Some((pubkey, hosts))
-}

target

@@ -1 +0,0 @@
-/home/lx.nobackup/rust/netapp.target/