Added Transmog compatability.

This commit adds support for specifying the serialization format at the
time of accepting a connection, which means that ALPN protocol
negotiation can be used to control which serialization format is used on
an incoming connection.

The next feature is the ability to switch serialization formats on a
per-stream basis, after the r#type negotation.

Cargo.toml

@@ -16,7 +16,7 @@ trust-dns = ["trust-dns-resolver"]
 
 [dependencies]
 async-trait = "0.1"
-bincode = "1"
+transmog = "0.1.0-dev.2"
 bytes = "1"
 ct-logs = "0.9"
 flume = "0.10"
@@ -54,6 +54,7 @@ fabruic = { path = "", features = ["rcgen", "test"] }
 quinn-proto = { version = "0.8", default-features = false }
 tokio = { version = "1", features = ["macros"] }
 trust-dns-proto = "0.21.0-alpha.4"
+transmog-bincode = { version = "0.1.0-dev.2" }
 
 [profile.release]
 codegen-units = 1

examples/basic.rs

@@ -1,6 +1,7 @@
 use anyhow::{Error, Result};
 use fabruic::{Endpoint, KeyPair};
 use futures_util::{future, StreamExt, TryFutureExt};
+use transmog_bincode::Bincode;
 
 const SERVER_NAME: &str = "test";
 /// Some random port.
@@ -38,7 +39,7 @@ async fn main() -> Result<()> {
 					index,
 					connecting.remote_address()
 				);
-				let connection = connecting.accept::<()>().await?;
+				let connection = connecting.accept::<(), _>(Bincode::default()).await?;
 				println!(
 					"[client:{}] Successfully connected to {}",
 					index,
@@ -107,7 +108,7 @@ async fn main() -> Result<()> {
 		// every new incoming connections is handled in it's own task
 		connections.push(
 			tokio::spawn(async move {
-				let mut connection = connecting.accept::<()>().await?;
+				let mut connection = connecting.accept::<(), _>(Bincode::default()).await?;
 				println!("[server] New Connection: {}", connection.remote_address());
 
 				// start listening to new incoming streams

src/error.rs

@@ -8,11 +8,10 @@
 // TODO: error type is becoming too big, split it up
 
 use std::{
-	fmt::{self, Debug, Formatter},
+	fmt::{self, Debug, Display, Formatter},
 	io,
 };
 
-pub use bincode::ErrorKind;
 use quinn::ConnectionClose;
 pub use quinn::{ConnectError, ConnectionError, ReadError, WriteError};
 use thiserror::Error;
@@ -207,7 +206,9 @@ impl From<ConnectionError> for Connecting {
 				reason,
 			}) if reason.as_ref() == b"peer doesn't support any known protocol"
 				&& error_code.to_string() == "the cryptographic handshake failed: error 120" =>
-				Self::ProtocolMismatch,
+			{
+				Self::ProtocolMismatch
+			}
 			other => Self::Connection(other),
 		}
 	}
@@ -241,23 +242,25 @@ pub enum Incoming {
 
 /// Error receiving a message from a [`Receiver`](crate::Receiver).
 #[derive(Debug, Error)]
+#[allow(variant_size_differences)]
 pub enum Receiver {
 	/// Failed to read from a [`Receiver`](crate::Receiver).
 	#[error("Error reading from `Receiver`: {0}")]
 	Read(#[from] ReadError),
 	/// Failed to [`Deserialize`](serde::Deserialize) a message from a
 	/// [`Receiver`](crate::Receiver).
 	#[error("Error deserializing a message from `Receiver`: {0}")]
-	Deserialize(#[from] ErrorKind),
+	Deserialize(Box<dyn SerializationError>),
 }
 
 /// Error sending a message to a [`Sender`](crate::Sender).
 #[derive(Debug, Error)]
+#[allow(variant_size_differences)]
 pub enum Sender {
 	/// Failed to [`Serialize`](serde::Serialize) a message for a
 	/// [`Sender`](crate::Sender).
 	#[error("Error serializing a message to `Sender`: {0}")]
-	Serialize(ErrorKind),
+	Serialize(Box<dyn SerializationError>),
 	/// Failed to write to a [`Sender`](crate::Sender).
 	#[error("Error writing to `Sender`: {0}")]
 	Write(#[from] WriteError),
@@ -266,8 +269,14 @@ pub enum Sender {
 	Closed(#[from] AlreadyClosed),
 }
 
-impl From<Box<ErrorKind>> for Sender {
-	fn from(error: Box<ErrorKind>) -> Self {
-		Self::Serialize(*error)
+impl Sender {
+	/// Returns a new instance after boxing `err`.
+	pub(crate) fn from_serialization<E: SerializationError>(err: E) -> Self {
+		Self::Serialize(Box::new(err))
 	}
 }
+
+/// An error raised from serialization.
+pub trait SerializationError: Display + Debug + Send + Sync + 'static {}
+
+impl<T> SerializationError for T where T: Display + Debug + Send + Sync + 'static {}

src/quic/connection/connecting.rs

@@ -4,9 +4,12 @@
 use std::net::SocketAddr;
 
 use quinn::{crypto::rustls::HandshakeData, NewConnection};
-use serde::{de::DeserializeOwned, Serialize};
+use transmog::OwnedDeserializer;
 
-use crate::{error, Connection};
+use crate::{
+	error::{self, SerializationError},
+	Connection,
+};
 
 /// Represent's an intermediate state to build a [`Connection`].
 #[must_use = "`Connecting` does nothing unless accepted with `Connecting::accept`"]
@@ -47,17 +50,20 @@ impl Connecting {
 	///
 	/// # Errors
 	/// [`error::Connecting`] if the [`Connection`] failed to be established.
-	pub async fn accept<T: DeserializeOwned + Serialize + Send + 'static>(
-		self,
-	) -> Result<Connection<T>, error::Connecting> {
+	pub async fn accept<T, F>(self, format: F) -> Result<Connection<T, F>, error::Connecting>
+	where
+		T: Send + 'static,
+		F: OwnedDeserializer<T> + Clone,
+		F::Error: SerializationError,
+	{
 		self.0
 			.await
 			.map(
 				|NewConnection {
 				     connection,
 				     bi_streams,
 				     ..
-				 }| Connection::new(connection, bi_streams),
+				 }| Connection::new(connection, bi_streams, format),
 			)
 			.map_err(error::Connecting::from)
 	}

src/quic/connection/incoming.rs

@@ -4,24 +4,30 @@ use std::fmt::{self, Debug, Formatter};
 
 use futures_util::StreamExt;
 use quinn::{RecvStream, SendStream};
-use serde::{de::DeserializeOwned, Serialize};
+use transmog::{Format, OwnedDeserializer};
 
 use super::ReceiverStream;
-use crate::{error, Receiver, Sender};
+use crate::{
+	error::{self, SerializationError},
+	Receiver, Sender,
+};
 
 /// An intermediate state to define which type to accept in this stream. See
 /// [`accept_stream`](Self::accept).
 #[must_use = "`Incoming` does nothing unless accepted with `Incoming::accept`"]
-pub struct Incoming<T: DeserializeOwned> {
+pub struct Incoming<T, F: OwnedDeserializer<T>> {
 	/// [`SendStream`] to build [`Sender`].
 	sender: SendStream,
 	/// [`RecvStream`] to build [`Receiver`].
-	receiver: ReceiverStream<T>,
+	receiver: ReceiverStream<T, F>,
 	/// Requested type.
 	r#type: Option<Result<T, error::Incoming>>,
 }
 
-impl<T: DeserializeOwned> Debug for Incoming<T> {
+impl<T, F> Debug for Incoming<T, F>
+where
+	F: OwnedDeserializer<T>,
+{
 	fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
 		f.debug_struct("Incoming")
 			.field("sender", &self.sender)
@@ -31,12 +37,16 @@ impl<T: DeserializeOwned> Debug for Incoming<T> {
 	}
 }
 
-impl<T: DeserializeOwned> Incoming<T> {
+impl<T, F> Incoming<T, F>
+where
+	F: OwnedDeserializer<T> + Clone,
+	F::Error: SerializationError,
+{
 	/// Builds a new [`Incoming`] from raw [`quinn`] types.
-	pub(super) fn new(sender: SendStream, receiver: RecvStream) -> Self {
+	pub(super) fn new(sender: SendStream, receiver: RecvStream, format: F) -> Self {
 		Self {
 			sender,
-			receiver: ReceiverStream::new(receiver),
+			receiver: ReceiverStream::new(receiver, format),
 			r#type: None,
 		}
 	}
@@ -80,12 +90,57 @@ impl<T: DeserializeOwned> Incoming<T> {
 	/// - [`error::Incoming::Receiver`] if receiving the type information to the
 	///   peer failed, see [`error::Receiver`] for more details
 	/// - [`error::Incoming::Closed`] if the stream was closed
-	pub async fn accept<
-		S: DeserializeOwned + Serialize + Send + 'static,
-		R: DeserializeOwned + Serialize + Send + 'static,
-	>(
+	pub async fn accept<S: Send + 'static, R: Send + 'static>(
+		self,
+	) -> Result<(Sender<S, F>, Receiver<R>), error::Incoming>
+	where
+		F: OwnedDeserializer<R> + Format<'static, S> + 'static,
+		<F as Format<'static, S>>::Error: SerializationError,
+		<F as Format<'static, R>>::Error: SerializationError,
+	{
+		let format = self.receiver.format.clone();
+		self.accept_with_format(format).await
+	}
+
+	/// Accept the incoming stream with the given types.
+	///
+	/// Use `S` and `R` to define which type this stream is sending and
+	/// receiving.
+	///
+	/// # Errors
+	/// - [`error::Incoming::Receiver`] if receiving the type information to the
+	///   peer failed, see [`error::Receiver`] for more details
+	/// - [`error::Incoming::Closed`] if the stream was closed
+	pub async fn accept_raw<S: Send + 'static, R: Send + 'static>(
+		self,
+	) -> Result<(Sender<S, F>, Receiver<R>), error::Incoming>
+	where
+		F: OwnedDeserializer<R> + Format<'static, S> + 'static,
+		<F as Format<'static, S>>::Error: SerializationError,
+		<F as Format<'static, R>>::Error: SerializationError,
+	{
+		let format = self.receiver.format.clone();
+		self.accept_with_format(format).await
+	}
+
+	/// Accept the incoming stream with the given types.
+	///
+	/// Use `S` and `R` to define which type this stream is sending and
+	/// receiving.
+	///
+	/// # Errors
+	/// - [`error::Incoming::Receiver`] if receiving the type information to the
+	///   peer failed, see [`error::Receiver`] for more details
+	/// - [`error::Incoming::Closed`] if the stream was closed
+	pub async fn accept_with_format<S: Send + 'static, R: Send + 'static, NewFormat>(
 		mut self,
-	) -> Result<(Sender<S>, Receiver<R>), error::Incoming> {
+		format: NewFormat,
+	) -> Result<(Sender<S, NewFormat>, Receiver<R>), error::Incoming>
+	where
+		NewFormat: OwnedDeserializer<R> + Format<'static, S> + Clone + 'static,
+		<NewFormat as Format<'static, S>>::Error: SerializationError,
+		<NewFormat as Format<'static, R>>::Error: SerializationError,
+	{
 		match self.r#type {
 			Some(Ok(_)) => (),
 			Some(Err(error)) => return Err(error),
@@ -100,8 +155,8 @@ impl<T: DeserializeOwned> Incoming<T> {
 			}
 		}
 
-		let sender = Sender::new(self.sender);
-		let receiver = Receiver::new(self.receiver.transmute());
+		let sender = Sender::new(self.sender, format.clone());
+		let receiver = Receiver::new(self.receiver.transmute(format));
 
 		Ok((sender, receiver))
 	}