WIP

Cargo.lock

@@ -66,6 +66,124 @@ version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
 
+[[package]]
+name = "async-channel"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81953c529336010edd6d8e358f886d9581267795c61b19475b71314bffa46d35"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
+[[package]]
+name = "async-executor"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fa3dc5f2a8564f07759c008b9109dc0d39de92a88d5588b8a5036d286383afb"
+dependencies = [
+ "async-lock",
+ "async-task",
+ "concurrent-queue",
+ "fastrand",
+ "futures-lite",
+ "slab",
+]
+
+[[package]]
+name = "async-global-executor"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1b6f5d7df27bd294849f8eec66ecfc63d11814df7a4f5d74168a2394467b776"
+dependencies = [
+ "async-channel",
+ "async-executor",
+ "async-io",
+ "async-lock",
+ "blocking",
+ "futures-lite",
+ "once_cell",
+]
+
+[[package]]
+name = "async-io"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fc5b45d93ef0529756f812ca52e44c221b35341892d3dcc34132ac02f3dd2af"
+dependencies = [
+ "async-lock",
+ "autocfg",
+ "cfg-if",
+ "concurrent-queue",
+ "futures-lite",
+ "log",
+ "parking",
+ "polling",
+ "rustix",
+ "slab",
+ "socket2 0.4.9",
+ "waker-fn",
+]
+
+[[package]]
+name = "async-lock"
+version = "2.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa24f727524730b077666307f2734b4a1a1c57acb79193127dcc8914d5242dd7"
+dependencies = [
+ "event-listener",
+]
+
+[[package]]
+name = "async-std"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62565bb4402e926b29953c785397c6dc0391b7b446e45008b0049eb43cec6f5d"
+dependencies = [
+ "async-channel",
+ "async-global-executor",
+ "async-io",
+ "async-lock",
+ "crossbeam-utils",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-lite",
+ "gloo-timers",
+ "kv-log-macro",
+ "log",
+ "memchr",
+ "once_cell",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+ "wasm-bindgen-futures",
+]
+
+[[package]]
+name = "async-task"
+version = "4.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecc7ab41815b3c653ccd2978ec3255c81349336702dfdf62ee6f7069b12a3aae"
+
+[[package]]
+name = "async-trait"
+version = "0.1.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b2d0f03b3640e3a630367e40c468cb7f309529c708ed1d88597047b0e7c6ef7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "atomic-waker"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1181e1e0d1fce796a03db1ae795d67167da795f9cf4a39c37589e85ef57f26d3"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -110,6 +228,21 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "blocking"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77231a1c8f801696fc0123ec6150ce92cffb8e164a02afb9c8ddee0e9b65ad65"
+dependencies = [
+ "async-channel",
+ "async-lock",
+ "async-task",
+ "atomic-waker",
+ "fastrand",
+ "futures-lite",
+ "log",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.13.0"
@@ -188,6 +321,15 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
+[[package]]
+name = "concurrent-queue"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62ec6771ecfa0762d24683ee5a32ad78487a3d3afdc0fb8cae19d2c5deb50b7c"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.3"
@@ -213,6 +355,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -276,6 +427,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "event-listener"
+version = "2.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0206175f82b8d6bf6652ff7d71a1e27fd2e4efde587fd368662814d6ec1d9ce0"
+
 [[package]]
 name = "fastrand"
 version = "1.9.0"
@@ -348,6 +505,21 @@ version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4fff74096e71ed47f8e023204cfd0aa1289cd54ae5430a9523be060cdb849964"
 
+[[package]]
+name = "futures-lite"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49a9d51ce47660b1e808d3c990b4709f2f415d928835a17dfd16991515c46bce"
+dependencies = [
+ "fastrand",
+ "futures-core",
+ "futures-io",
+ "memchr",
+ "parking",
+ "pin-project-lite",
+ "waker-fn",
+]
+
 [[package]]
 name = "futures-macro"
 version = "0.3.28"
@@ -410,6 +582,18 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "gloo-timers"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b995a66bb87bebce9a0f4a95aed01daca4872c050bfcb21653361c03bc35e5c"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "h2"
 version = "0.3.19"
@@ -669,6 +853,15 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "kv-log-macro"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0de8b303297635ad57c9f5059fd9cee7a47f8e8daa09df0fcd07dd39fb22977f"
+dependencies = [
+ "log",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.146"
@@ -696,6 +889,9 @@ name = "log"
 version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
+dependencies = [
+ "value-bag",
+]
 
 [[package]]
 name = "memchr"
@@ -735,6 +931,7 @@ name = "moq-demo"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "bytes",
  "clap",
  "env_logger",
  "hex",
@@ -747,15 +944,21 @@ dependencies = [
  "rustls-pemfile",
  "tokio",
  "warp",
+ "webtransport-generic 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webtransport-quinn",
 ]
 
 [[package]]
 name = "moq-transport"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "bytes",
+ "futures",
  "log",
  "thiserror",
+ "tokio",
+ "webtransport-generic 0.2.0",
 ]
 
 [[package]]
@@ -780,15 +983,15 @@ name = "moq-warp"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "bytes",
  "log",
  "moq-transport",
- "moq-transport-quinn",
  "mp4",
- "quinn",
  "ring",
  "rustls 0.21.2",
  "rustls-pemfile",
  "tokio",
+ "webtransport-generic 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -888,6 +1091,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
+[[package]]
+name = "parking"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14f2252c834a40ed9bb5422029649578e63aa341ac401f74e719dd1afda8394e"
+
 [[package]]
 name = "parking_lot"
 version = "0.12.1"
@@ -949,6 +1158,22 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "polling"
+version = "2.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b2d323e8ca7996b3e23126511a523f7e62924d93ecd5ae73b333815b0eb3dce"
+dependencies = [
+ "autocfg",
+ "bitflags",
+ "cfg-if",
+ "concurrent-queue",
+ "libc",
+ "log",
+ "pin-project-lite",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -1606,12 +1831,24 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
+[[package]]
+name = "value-bag"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d92ccd67fb88503048c01b59152a04effd0782d035a83a6d256ce6085f08f4a3"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "waker-fn"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
+
 [[package]]
 name = "want"
 version = "0.3.1"
@@ -1684,6 +1921,18 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.87"
@@ -1733,6 +1982,56 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "webtransport-generic"
+version = "0.2.0"
+dependencies = [
+ "async-trait",
+ "bytes",
+ "log",
+ "thiserror",
+]
+
+[[package]]
+name = "webtransport-generic"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db80267637ca8d24cd3425a3e993842ed9e128620f5fcd9603145fee8fe808fd"
+dependencies = [
+ "bytes",
+ "log",
+ "thiserror",
+]
+
+[[package]]
+name = "webtransport-proto"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24a891faa138075b2338bc3da6dc6a67c174118a088e2809db6882d410973cd6"
+dependencies = [
+ "bytes",
+ "http",
+ "thiserror",
+]
+
+[[package]]
+name = "webtransport-quinn"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea529a3044e99379b180581e8b0773fa7feb1fc53e341f36927a755ac05abd62"
+dependencies = [
+ "async-std",
+ "bytes",
+ "futures",
+ "http",
+ "quinn",
+ "quinn-proto",
+ "thiserror",
+ "tokio-util",
+ "webtransport-generic 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webtransport-proto",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"

Cargo.toml

@@ -1,7 +1,2 @@
 [workspace]
-members = [
+members = ["moq-transport", "moq-transport-quinn", "moq-demo", "moq-warp"]
-    "moq-transport",
-	"moq-transport-quinn",
-    "moq-demo",
-    "moq-warp",
-]

moq-demo/Cargo.toml

@@ -11,12 +11,9 @@ edition = "2021"
 keywords = ["quic", "http3", "webtransport", "media", "live"]
 categories = ["multimedia", "network-programming", "web-programming"]
 
-
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-moq-transport = { path = "../moq-transport" }
-moq-warp = { path = "../moq-warp" }
 
 # QUIC
 quinn = "0.10"
@@ -38,3 +35,11 @@ clap = { version = "4.0", features = [ "derive" ] }
 log = { version = "0.4", features = ["std"] }
 env_logger = "0.9.3"
 anyhow = "1.0.70"
+
+bytes = "1"
+
+webtransport-generic = "0.2"
+webtransport-quinn = "0.3"
+
+moq-transport = { path = "../moq-transport" }
+moq-warp = { path = "../moq-warp" }

moq-demo/src/main.rs

@@ -1,11 +1,18 @@
-use std::{fs, io, net, path, sync};
+use std::{fs, io, net, path};
 
 use anyhow::Context;
 use clap::Parser;
+use moq_transport::{Role, SetupServer, Version};
 use ring::digest::{digest, SHA256};
+use tokio::task::JoinSet;
 use warp::Filter;
 
-use moq_warp::{relay, source};
+use moq_warp::{
+	relay::{self, broker::Broadcasts},
+	source,
+};
+
+mod server;
 
 /// Search for a pattern in a file and display the lines that contain it.
 #[derive(Parser, Clone)]
@@ -49,19 +56,55 @@ async fn main() -> anyhow::Result<()> {
 		addr: args.addr,
 		cert: args.cert,
 		key: args.key,
-		broker,
+		broker: broker.clone(),
 	};
 
-	let server = relay::Server::new(config).context("failed to create server")?;
-
-	// Run all of the above
 	tokio::select! {
-		res = server.run() => res.context("failed to run server"),
+		res = run_server(config, broker) => res.context("failed to run server"),
 		res = media.run() => res.context("failed to run media source"),
 		res = serve => res.context("failed to run HTTP server"),
 	}
 }
 
+async fn run_server(config: relay::ServerConfig, broker: Broadcasts) -> anyhow::Result<()> {
+	let quinn = server::Server::new(config).unwrap();
+
+	let mut tasks = JoinSet::new();
+	loop {
+		let broker = broker.clone();
+		tokio::select! {
+			connect = server::Server::accept_new_webtransport_session(&quinn) => {
+				tasks.spawn(async move {
+					let client_setup = connect?.accept().await?;
+					// TODO: maybe reject setup
+					let role = match client_setup.setup().role {
+						Role::Publisher => Role::Subscriber,
+						Role::Subscriber => Role::Publisher,
+						Role::Both => Role::Both,
+					};
+					let setup_server = SetupServer {
+						version: Version::DRAFT_00,
+						role,
+					};
+
+					let session = client_setup.accept(setup_server).await?;
+					let session = relay::Session::from_transport_session(session, broker.clone()).await?;
+					session.run().await?;
+					let ret: anyhow::Result<()> = Ok(());
+					ret
+				});
+			}
+			res = tasks.join_next(), if !tasks.is_empty() => {
+				let res = res.expect("no tasks").expect("task aborted");
+
+				if let Err(err) = res {
+					log::error!("session terminated: {:?}", err);
+				}
+			},
+		}
+	}
+}
+
 // Run a HTTP server using Warp
 // TODO remove this when Chrome adds support for self-signed certificates using WebTransport
 async fn serve_http(args: Cli) -> anyhow::Result<()> {
@@ -76,7 +119,7 @@ async fn serve_http(args: Cli) -> anyhow::Result<()> {
 	// Compute the SHA-256 digest
 	let fingerprint = digest(&SHA256, cert.as_ref());
 	let fingerprint = hex::encode(fingerprint.as_ref());
-	let fingerprint = sync::Arc::new(fingerprint);
+	let fingerprint = std::sync::Arc::new(fingerprint);
 
 	let cors = warp::cors().allow_any_origin();
 

moq-demo/src/server/mod.rs

@@ -0,0 +1,209 @@
+use std::{fs, io, time};
+
+use anyhow::Context;
+use bytes::Bytes;
+use h3::quic::BidiStream;
+use h3_webtransport::server::AcceptedBi;
+use moq_transport::AcceptSetup;
+use moq_warp::relay::ServerConfig;
+use tokio::task::JoinSet;
+use warp::{http, Future};
+
+pub struct Server {
+	// The MoQ transport server.
+	server: quinn::Endpoint,
+}
+
+impl Server {
+	// Create a new server
+	pub fn new(config: ServerConfig) -> anyhow::Result<Self> {
+		// Read the PEM certificate chain
+		let certs = fs::File::open(config.cert).context("failed to open cert file")?;
+		let mut certs = io::BufReader::new(certs);
+		let certs = rustls_pemfile::certs(&mut certs)?
+			.into_iter()
+			.map(rustls::Certificate)
+			.collect();
+
+		// Read the PEM private key
+		let keys = fs::File::open(config.key).context("failed to open key file")?;
+		let mut keys = io::BufReader::new(keys);
+		let mut keys = rustls_pemfile::pkcs8_private_keys(&mut keys)?;
+
+		anyhow::ensure!(keys.len() == 1, "expected a single key");
+		let key = rustls::PrivateKey(keys.remove(0));
+
+		let mut tls_config = rustls::ServerConfig::builder()
+			.with_safe_default_cipher_suites()
+			.with_safe_default_kx_groups()
+			.with_protocol_versions(&[&rustls::version::TLS13])
+			.unwrap()
+			.with_no_client_auth()
+			.with_single_cert(certs, key)?;
+
+		tls_config.max_early_data_size = u32::MAX;
+		let alpn: Vec<Vec<u8>> = vec![webtransport_quinn::ALPN];
+		tls_config.alpn_protocols = alpn;
+
+		let mut server_config = quinn::ServerConfig::with_crypto(std::sync::Arc::new(tls_config));
+
+		// Enable BBR congestion control
+		// TODO validate the implementation
+		let mut transport_config = quinn::TransportConfig::default();
+		transport_config.keep_alive_interval(Some(time::Duration::from_secs(2)));
+		transport_config.congestion_controller_factory(std::sync::Arc::new(quinn::congestion::BbrConfig::default()));
+
+		server_config.transport = std::sync::Arc::new(transport_config);
+		let server = quinn::Endpoint::server(server_config, config.addr)?;
+
+		Ok(Self { server })
+	}
+
+	pub async fn accept_new_webtransport_session(endpoint: &h3_quinn::Endpoint) -> anyhow::Result<Connect> {
+		let mut handshake = JoinSet::new();
+		// perform a quic handshake
+		loop {
+			tokio::select!(
+				// Accept the connection and start the WebTransport handshake.
+				conn = endpoint.accept() => {
+					let conn = conn.context("failed to accept connection").unwrap();
+					handshake.spawn(async move {
+
+						let conn = conn.await.context("failed to accept h3 connection")?;
+
+						let mut conn = h3::server::builder()
+							.enable_webtransport(true)
+							.enable_connect(true)
+							.enable_datagram(true)
+							.max_webtransport_sessions(1)
+							.send_grease(true)
+							.build(h3_quinn::Connection::new(conn))
+							.await
+							.context("failed to create h3 server")?;
+
+						let (req, stream) = conn
+							.accept()
+							.await
+							.context("failed to accept h3 session")?
+							.context("failed to accept h3 request")?;
+
+						let ext = req.extensions();
+						anyhow::ensure!(req.method() == http::Method::CONNECT, "expected CONNECT request");
+						anyhow::ensure!(
+							ext.get::<h3::ext::Protocol>() == Some(&h3::ext::Protocol::WEB_TRANSPORT),
+							"expected WebTransport CONNECT"
+						);
+
+						// Let the application decide if we accept this CONNECT request.
+						Ok(Connect { conn, req, stream })
+					});
+				},
+				// Return any mostly finished WebTransport handshakes.
+				res = handshake.join_next(), if !handshake.is_empty() => {
+					let res = res.expect("no tasks").expect("task aborted");
+					match res {
+						Ok(connect_request) => return Ok(connect_request),
+						Err(err) => log::warn!("failed to accept session: {:?}", err),
+					}
+				},
+			)
+		}
+	}
+}
+
+// The WebTransport CONNECT has arrived, and we need to decide if we accept it.
+pub struct Connect {
+	// Inspect to decide whether to accept() or reject() the session.
+	req: http::Request<()>,
+
+	conn: h3::server::Connection<h3_quinn::Connection, Bytes>,
+	stream: h3::server::RequestStream<h3_quinn::BidiStream<Bytes>, Bytes>,
+}
+
+impl Connect {
+	// Accept the WebTransport session.
+	pub async fn accept(self) -> anyhow::Result<AcceptSetup<Server>> {
+		let session = h3_webtransport::server::WebTransportSession::accept(self.req, self.stream, self.conn).await?;
+		let mut session = Server { server: session };
+
+		let (control_stream_send, control_stream_recv) = moq_transport::accept_bidi(&mut session)
+			.await
+			.context("failed to accept bidi stream")?
+			.unwrap();
+
+		Ok(moq_transport::Session::accept(session).await?)
+	}
+
+	// Reject the WebTransport session with a HTTP response.
+	pub async fn reject(mut self, resp: http::Response<()>) -> anyhow::Result<()> {
+		self.stream.send_response(resp).await?;
+		Ok(())
+	}
+}
+
+impl webtransport_generic::Connection for Server {
+	type Error = anyhow::Error;
+	type SendStream = QuinnSendStream;
+
+	type RecvStream = QuinnRecvStream;
+
+	fn poll_accept_uni(
+		&mut self,
+		cx: &mut std::task::Context<'_>,
+	) -> std::task::Poll<Result<Option<Self::RecvStream>, Self::Error>> {
+		let fut = self.server.accept_uni();
+		let fut = std::pin::pin!(fut);
+		fut.poll(cx)
+			.map_ok(|opt| opt.map(|(_, s)| QuinnRecvStream::new(s)))
+			.map_err(|e| anyhow::anyhow!("{:?}", e))
+	}
+
+	fn poll_accept_bidi(
+		&mut self,
+		cx: &mut std::task::Context<'_>,
+	) -> std::task::Poll<Result<Option<(Self::SendStream, Self::RecvStream)>, Self::Error>> {
+		let fut = self.server.accept_bi();
+		let fut = std::pin::pin!(fut);
+		let res = std::task::ready!(fut.poll(cx).map_err(|e| anyhow::anyhow!("{:?}", e)));
+		match res {
+			Ok(Some(AcceptedBi::Request(_, _))) => {
+				std::task::Poll::Ready(Err(anyhow::anyhow!("received new session whils accepting bidi stream")))
+			}
+			Ok(Some(AcceptedBi::BidiStream(_, s))) => {
+				let (send, recv) = s.split();
+				std::task::Poll::Ready(Ok(Some((QuinnSendStream::new(send), QuinnRecvStream::new(recv)))))
+			}
+			Ok(None) => std::task::Poll::Ready(Ok(None)),
+			Err(e) => std::task::Poll::Ready(Err(e)),
+		}
+	}
+
+	fn poll_open_bidi(
+		&mut self,
+		cx: &mut std::task::Context<'_>,
+	) -> std::task::Poll<Result<(Self::SendStream, Self::RecvStream), Self::Error>> {
+		let fut = self.server.open_bi(self.server.session_id());
+		let fut = std::pin::pin!(fut);
+		fut.poll(cx)
+			.map_ok(|s| {
+				let (send, recv) = s.split();
+				(QuinnSendStream::new(send), QuinnRecvStream::new(recv))
+			})
+			.map_err(|e| anyhow::anyhow!("{:?}", e))
+	}
+
+	fn poll_open_uni(
+		&mut self,
+		cx: &mut std::task::Context<'_>,
+	) -> std::task::Poll<Result<Self::SendStream, Self::Error>> {
+		let fut = self.server.open_uni(self.server.session_id());
+		let fut = std::pin::pin!(fut);
+		fut.poll(cx)
+			.map_ok(|s| QuinnSendStream::new(s))
+			.map_err(|e| anyhow::anyhow!("{:?}", e))
+	}
+
+	fn close(&mut self, _code: u32, _reason: &[u8]) {
+		todo!("not implemented")
+	}
+}

moq-transport/Cargo.toml

@@ -18,3 +18,7 @@ categories = [ "multimedia", "network-programming", "web-programming" ]
 bytes = "1"
 thiserror = "1.0.21"
 log = "0.4"
+tokio = { version = "1.27", features = ["full"] }
+anyhow = "1.0.70"
+webtransport-generic = { version = "0.2", path = "../../webtransport-rs/webtransport-generic" }
+futures = "0.3"

moq-transport/src/lib.rs

@@ -1,7 +1,9 @@
 mod coding;
 mod control;
 mod object;
+mod network;
 
 pub use coding::*;
 pub use control::*;
 pub use object::*;
+pub use network::*;

moq-transport/src/network/control.rs

@@ -0,0 +1,101 @@
+use crate::{Decode, DecodeError, Encode, Message};
+use webtransport_generic::{RecvStream, SendStream};
+
+use bytes::{Buf, BytesMut};
+
+use std::future;
+use std::io::Cursor;
+use std::sync::Arc;
+use tokio::sync::Mutex;
+
+use anyhow::Context;
+
+pub struct SendControl<S: SendStream> {
+	stream: S,
+	buf: BytesMut, // reuse a buffer to encode messages.
+}
+
+impl<S: SendStream> SendControl<S> {
+	pub fn new(stream: S) -> Self {
+		Self {
+			buf: BytesMut::new(),
+			stream,
+		}
+	}
+
+	pub async fn send<T: Into<Message>>(&mut self, msg: T) -> anyhow::Result<()> {
+		let msg = msg.into();
+		log::info!("sending message: {:?}", msg);
+
+		self.buf.clear();
+		msg.encode(&mut self.buf)?;
+
+		// TODO make this work with select!
+		self.stream
+			.send(&mut self.buf)
+			.await
+			.context("error sending control message")?;
+
+		Ok(())
+	}
+
+	// Helper that lets multiple threads send control messages.
+	pub fn share(self) -> SharedControl<S> {
+		SharedControl {
+			stream: Arc::new(Mutex::new(self)),
+		}
+	}
+}
+
+// Helper that allows multiple threads to send control messages.
+// There's no equivalent for receiving since only one thread should be receiving at a time.
+#[derive(Clone)]
+pub struct SharedControl<S: SendStream> {
+	stream: Arc<Mutex<SendControl<S>>>,
+}
+
+impl<S: SendStream> SharedControl<S> {
+	pub async fn send<T: Into<Message>>(&mut self, msg: T) -> anyhow::Result<()> {
+		let mut stream = self.stream.lock().await;
+		stream.send(msg).await
+	}
+}
+
+pub struct RecvControl<R: RecvStream> {
+	stream: R,
+	buf: BytesMut, // data we've read but haven't fully decoded yet
+}
+
+impl<R: RecvStream> RecvControl<R> {
+	pub fn new(stream: R) -> Self {
+		Self {
+			buf: BytesMut::new(),
+			stream,
+		}
+	}
+
+	// Read the next full message from the stream.
+	pub async fn recv(&mut self) -> anyhow::Result<Message> {
+		loop {
+			// Read the contents of the buffer
+			let mut peek = Cursor::new(&self.buf);
+
+			match Message::decode(&mut peek) {
+				Ok(msg) => {
+					// We've successfully decoded a message, so we can advance the buffer.
+					self.buf.advance(peek.position() as usize);
+
+					log::info!("received message: {:?}", msg);
+					return Ok(msg);
+				}
+				Err(DecodeError::UnexpectedEnd) => {
+					// The decode failed, so we need to append more data.
+					future::poll_fn(|cx| self.stream.poll_recv(cx, &mut self.buf))
+						.await
+						.context("error receiving control message")?;
+				}
+				Err(e) => return Err(e.into()),
+			}
+		}
+	}
+}

moq-transport/src/network/mod.rs

@@ -0,0 +1,7 @@
+mod control;
+mod objects;
+mod server;
+
+pub use control::*;
+pub use objects::*;
+pub use server::*;

moq-transport/src/network/objects.rs

@@ -0,0 +1,103 @@
+use crate::{Decode, DecodeError, Encode, Object};
+use anyhow::Context;
+use bytes::{Buf, BytesMut};
+use futures::StreamExt;
+use futures::TryStreamExt;
+use std::{
+	io::Cursor,
+	pin::Pin,
+	task::{ready, Poll},
+};
+use tokio::task::JoinSet;
+use webtransport_generic::{AsyncRecvStream, AsyncSendStream, AsyncSession};
+
+// TODO support clients
+
+pub struct SendObjects<S: AsyncSession> {
+	session: S,
+
+	// A reusable buffer for encoding messages.
+	buf: BytesMut,
+}
+
+impl<S: AsyncSession> SendObjects<S> {
+	pub fn new(session: S) -> Self {
+		Self {
+			session,
+			buf: BytesMut::new(),
+		}
+	}
+
+	pub async fn send(&mut self, header: Object) -> anyhow::Result<S::SendStream> {
+		self.buf.clear();
+		header.encode(&mut self.buf).unwrap();
+
+		let mut stream = self.session.open_uni().await.context("failed to open uni stream")?;
+
+		stream
+			.send(&mut self.buf)
+			.await
+			.context("failed to send data on stream")?;
+
+		Ok(stream)
+	}
+}
+
+pub struct RecvObjects<S: AsyncSession> {
+	session: S,
+	objects: JoinSet<anyhow::Result<(Object, S::RecvStream)>>,
+}
+
+impl<S: AsyncSession + Clone> RecvObjects<S> {
+	pub fn new(session: S) -> Self {
+		let streams = futures::stream::unfold(session.clone(), |mut session| async move {
+			match session.accept_uni().await {
+				Ok(stream) => Some((stream, session)),
+				Err(e) => None,
+			}
+		});
+
+		let objects = streams.map(|mut stream| async move {});
+
+		// Decode the object header for up to 16 streams in parallel.
+		// Otherwise, a lost packet for the first chunk of a stream would block future streams.
+		let objects = objects.buffer_unordered(16);
+
+		let objects = Box::pin(objects);
+
+		//try_buffer_unordered
+
+		let objects = JoinSet::new();
+
+		Self { session, objects }
+	}
+
+	pub async fn next(&mut self) -> anyhow::Result<(Object, S::RecvStream)> {
+		loop {
+			tokio::select! {
+				res = self.objects.join_next(), if !self.objects.is_empty() => {
+					return res.unwrap()?;
+				},
+				res = self.session.accept_uni() => {
+					let stream = res?;
+					self.objects.spawn(async move { Self::fetch(stream).await });
+				},
+			}
+		}
+	}
+
+	async fn fetch(mut stream: S::RecvStream) -> anyhow::Result<(Object, S::RecvStream)> {
+		let mut buf = Vec::with_capacity(64);
+
+		loop {
+			stream.recv(&mut buf).await?.context("no more data")?;
+			let mut peek = Cursor::new(&buf);
+
+			match Object::decode(&mut peek) {
+				Ok(header) => return Ok((header, stream)),
+				Err(DecodeError::UnexpectedEnd) => continue,
+				Err(err) => return Err(err.into()),
+			}
+		}
+	}
+}

moq-transport/src/network/server.rs

@@ -0,0 +1,66 @@
+/*
+use crate::{Message, SetupClient, SetupServer};
+use anyhow::Context;
+use webtransport_generic::Session as Generic;
+
+use super::{RecvControl, RecvObjects, SendControl, SendObjects};
+
+pub struct Session<S: Generic> {
+	pub send_control: SendControl<S::SendStream>,
+	pub recv_control: RecvControl<S::RecvStream>,
+	pub send_objects: SendObjects<S>,
+	pub recv_objects: RecvObjects<S>,
+}
+
+impl<S: Generic + Send> Session<S> {
+	pub async fn accept(
+		session: S,
+	) -> anyhow::Result<AcceptSetup<S>> {
+		let send_objects = SendObjects::new(session.clone());
+		let recv_objects = RecvObjects::new(session.clone());
+
+		let setup_client = match recv_control await.context("failed to read SETUP")? {
+			Message::SetupClient(setup) => setup,
+			_ => anyhow::bail!("expected CLIENT SETUP"),
+		};
+
+		Ok(AcceptSetup {
+			setup_client,
+			control,
+			objects,
+		})
+	}
+
+	pub fn split(self) -> (Control<C>, Objects<C>) {
+		(self.control, self.objects)
+	}
+}
+
+pub struct AcceptSetup<C: Generic + Send> {
+	setup_client: SetupClient,
+	control: Control<C>,
+	objects: Objects<C>,
+}
+
+impl<C: Generic + Send> AcceptSetup<C> {
+	// Return the setup message we received.
+	pub fn setup(&self) -> &SetupClient {
+		&self.setup_client
+	}
+
+	// Accept the session with our own setup message.
+	pub async fn accept(mut self, setup_server: SetupServer) -> anyhow::Result<Session<C>> {
+		self.control.send(setup_server).await?;
+		Ok(Session {
+			control: self.control,
+			objects: self.objects,
+		})
+	}
+
+	pub async fn reject(self) -> anyhow::Result<()> {
+		// TODO Close the QUIC connection with an error code.
+		Ok(())
+	}
+}
+
+*/

moq-warp/Cargo.toml

@@ -16,15 +16,15 @@ categories = [ "multimedia", "network-programming", "web-programming" ]
 
 [dependencies]
 moq-transport = { path = "../moq-transport" }
-moq-transport-quinn = { path = "../moq-transport-quinn" }
+webtransport-generic = "0.2"
 
+bytes = "1"
 tokio = "1.27"
 mp4 = "0.13.0"
 anyhow = "1.0.70"
 log = "0.4"       # TODO remove
 
 # QUIC stuff
-quinn = "0.10"
 ring = "0.16.20"
 rustls = "0.21.2"
 rustls-pemfile = "1.0.2"

moq-warp/src/relay/contribute.rs

@@ -2,12 +2,13 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use std::time;
 
-use tokio::io::AsyncReadExt;
+use bytes::Buf;
+use webtransport_generic::{Connection, RecvStream};
 use tokio::sync::mpsc;
 use tokio::task::JoinSet; // lock across await boundaries
 
-use moq_transport::{Announce, AnnounceError, AnnounceOk, Object, Subscribe, SubscribeError, SubscribeOk, VarInt};
+use moq_transport::{Announce, AnnounceError, AnnounceOk, Object, Subscribe, SubscribeError, SubscribeOk, VarInt, RecvObjects};
-use moq_transport_quinn::{RecvObjects, RecvStream};
+
 
 use anyhow::Context;
 
@@ -16,9 +17,9 @@ use crate::model::{broadcast, segment, track};
 use crate::source::Source;
 
 // TODO experiment with making this Clone, so every task can have its own copy.
-pub struct Session {
+pub struct Session<C: Connection + Send> {
 	// Used to receive objects.
-	objects: RecvObjects,
+	objects: RecvObjects<C>,
 
 	// Used to send and receive control messages.
 	control: control::Component<control::Contribute>,
@@ -36,9 +37,9 @@ pub struct Session {
 	run_segments: JoinSet<anyhow::Result<()>>, // receiving objects
 }
 
-impl Session {
+impl<R: RecvStream + Send + 'static, C: Connection<RecvStream = R> + Send> Session<C> {
 	pub fn new(
-		objects: RecvObjects,
+		objects: RecvObjects<C>,
 		control: control::Component<control::Contribute>,
 		broker: broker::Broadcasts,
 	) -> Self {
@@ -63,7 +64,7 @@ impl Session {
 				},
 				object = self.objects.recv() => {
 					let (object, stream) = object.context("failed to receive object")?;
-					let res = self.receive_object(object, stream).await;
+					let res = self.receive_object(object, Box::new(stream)).await;
 					if let Err(err) = res {
 						log::error!("failed to receive object: {:?}", err);
 					}
@@ -88,7 +89,7 @@ impl Session {
 		}
 	}
 
-	async fn receive_object(&mut self, object: Object, stream: RecvStream) -> anyhow::Result<()> {
+	async fn receive_object(&mut self, object: Object, stream: Box<R>) -> anyhow::Result<()> {
 		let track = object.track;
 
 		let segment = segment::Info {
@@ -111,16 +112,18 @@ impl Session {
 		Ok(())
 	}
 
-	async fn run_segment(mut segment: segment::Publisher, mut stream: RecvStream) -> anyhow::Result<()> {
+	async fn run_segment(mut segment: segment::Publisher, mut stream: Box<R>) -> anyhow::Result<()> {
-		let mut buf = [0u8; 32 * 1024];
 		loop {
-			let size = stream.read(&mut buf).await.context("failed to read from stream")?;
+			let mut b = bytes::BytesMut::new();
-			if size == 0 {
+			let stream_finished = !moq_transport::recv(stream.as_mut(), &mut b)
+				.await
+				.map_err(|e| anyhow::anyhow!("{:?}", e.into()))
+				.context("error receiving control message")?;
+			if stream_finished {
 				return Ok(());
 			}
 
-			let chunk = buf[..size].to_vec();
+			segment.fragments.push(b.chunk().to_vec().into())
-			segment.fragments.push(chunk.into())
 		}
 	}
 
@@ -174,7 +177,7 @@ impl Session {
 	}
 }
 
-impl Drop for Session {
+impl<C: Connection + Send> Drop for Session<C> {
 	fn drop(&mut self) {
 		// Unannounce all broadcasts we have announced.
 		// TODO make this automatic so we can't screw up?

moq-warp/src/relay/control.rs

@@ -1,17 +1,17 @@
+use webtransport_generic::{SendStream, RecvStream};
 use tokio::sync::mpsc;
 
-use moq_transport::{Announce, AnnounceError, AnnounceOk, Message, Subscribe, SubscribeError, SubscribeOk};
+use moq_transport::{Announce, AnnounceError, AnnounceOk, Message, Subscribe, SubscribeError, SubscribeOk, Control};
-use moq_transport_quinn::Control;
 
-pub struct Main {
+pub struct Main<S: SendStream, R: RecvStream> {
-	control: Control,
+	control: Control<S, R>,
 	outgoing: mpsc::Receiver<Message>,
 
 	contribute: mpsc::Sender<Contribute>,
 	distribute: mpsc::Sender<Distribute>,
 }
 
-impl Main {
+impl<S: SendStream, R: RecvStream> Main <S, R> {
 	pub async fn run(mut self) -> anyhow::Result<()> {
 		loop {
 			tokio::select! {
@@ -51,7 +51,7 @@ impl<T> Component<T> {
 }
 
 // Splits a control stream into two components, based on if it's a message for contribution or distribution.
-pub fn split(control: Control) -> (Main, Component<Contribute>, Component<Distribute>) {
+pub fn split<S: SendStream, R: RecvStream>(control: Control<S, R>) -> (Main<S, R>, Component<Contribute>, Component<Distribute>) {
 	let (outgoing_tx, outgoing_rx) = mpsc::channel(1);
 	let (contribute_tx, contribute_rx) = mpsc::channel(1);
 	let (distribute_tx, distribute_rx) = mpsc::channel(1);

moq-warp/src/relay/distribute.rs

@@ -1,17 +1,17 @@
 use anyhow::Context;
 
-use tokio::io::AsyncWriteExt;
+use bytes::Buf;
+use webtransport_generic::{SendStream, Connection};
 use tokio::task::JoinSet; // allows locking across await
 
-use moq_transport::{Announce, AnnounceError, AnnounceOk, Object, Subscribe, SubscribeError, SubscribeOk, VarInt};
+use moq_transport::{Announce, AnnounceError, AnnounceOk, Object, Subscribe, SubscribeError, SubscribeOk, VarInt, SendObjects};
-use moq_transport_quinn::SendObjects;
 
 use super::{broker, control};
 use crate::model::{segment, track};
 
-pub struct Session {
+pub struct Session<C: Connection + Send> {
 	// Objects are sent to the client
-	objects: SendObjects,
+	objects: SendObjects<C>,
 
 	// Used to send and receive control messages.
 	control: control::Component<control::Distribute>,
@@ -23,9 +23,11 @@ pub struct Session {
 	run_subscribes: JoinSet<SubscribeError>, // run subscriptions, sending the returned error if they fail
 }
 
-impl Session {
+impl<S, C> Session<C> where
+	S: SendStream + Send,
+	C: Connection<SendStream = S> + Send + 'static {
 	pub fn new(
-		objects: SendObjects,
+		objects: SendObjects<C>,
 		control: control::Component<control::Distribute>,
 		broker: broker::Broadcasts,
 	) -> Self {
@@ -119,7 +121,7 @@ impl Session {
 		Ok(())
 	}
 
-	async fn run_subscribe(objects: SendObjects, track_id: VarInt, mut track: track::Subscriber) -> SubscribeError {
+	async fn run_subscribe(objects: SendObjects<C>, track_id: VarInt, mut track: track::Subscriber) -> SubscribeError {
 		let mut tasks = JoinSet::new();
 		let mut result = None;
 
@@ -154,7 +156,7 @@ impl Session {
 	}
 
 	async fn serve_group(
-		mut objects: SendObjects,
+		mut objects: SendObjects<C>,
 		track_id: VarInt,
 		mut segment: segment::Subscriber,
 	) -> anyhow::Result<()> {
@@ -169,11 +171,16 @@ impl Session {
 
 		// Write each fragment as they are available.
 		while let Some(fragment) = segment.fragments.next().await {
-			stream.write_all(fragment.as_slice()).await?;
+			let mut buf = bytes::Bytes::copy_from_slice(fragment.as_slice());
+			while buf.has_remaining() {
+				moq_transport::send(&mut stream, &mut buf)
+					.await
+					.map_err(|e| anyhow::anyhow!("{:?}", e.into()))
+					.context("error sending control message")?;
+			}
 		}
 
 		// NOTE: stream is automatically closed when dropped
-
 		Ok(())
 	}
 

moq-warp/src/relay/server.rs

@@ -1,21 +1,6 @@
-use super::{broker, Session};
+use super::broker;
 
-use std::{fs, io, net, path, sync, time};
+use std::{net, path};
-
-use anyhow::Context;
-
-use tokio::task::JoinSet;
-
-pub struct Server {
-	// The MoQ transport server.
-	server: moq_transport_quinn::Server,
-
-	// The media sources.
-	broker: broker::Broadcasts,
-
-	// Sessions actively being run.
-	tasks: JoinSet<anyhow::Result<()>>,
-}
 
 pub struct ServerConfig {
 	pub addr: net::SocketAddr,
@@ -24,82 +9,3 @@ pub struct ServerConfig {
 
 	pub broker: broker::Broadcasts,
 }
-
-impl Server {
-	// Create a new server
-	pub fn new(config: ServerConfig) -> anyhow::Result<Self> {
-		// Read the PEM certificate chain
-		let certs = fs::File::open(config.cert).context("failed to open cert file")?;
-		let mut certs = io::BufReader::new(certs);
-		let certs = rustls_pemfile::certs(&mut certs)?
-			.into_iter()
-			.map(rustls::Certificate)
-			.collect();
-
-		// Read the PEM private key
-		let keys = fs::File::open(config.key).context("failed to open key file")?;
-		let mut keys = io::BufReader::new(keys);
-		let mut keys = rustls_pemfile::pkcs8_private_keys(&mut keys)?;
-
-		anyhow::ensure!(keys.len() == 1, "expected a single key");
-		let key = rustls::PrivateKey(keys.remove(0));
-
-		let mut tls_config = rustls::ServerConfig::builder()
-			.with_safe_default_cipher_suites()
-			.with_safe_default_kx_groups()
-			.with_protocol_versions(&[&rustls::version::TLS13])
-			.unwrap()
-			.with_no_client_auth()
-			.with_single_cert(certs, key)?;
-
-		tls_config.max_early_data_size = u32::MAX;
-		let alpn: Vec<Vec<u8>> = vec![
-			b"h3".to_vec(),
-			b"h3-32".to_vec(),
-			b"h3-31".to_vec(),
-			b"h3-30".to_vec(),
-			b"h3-29".to_vec(),
-		];
-		tls_config.alpn_protocols = alpn;
-
-		let mut server_config = quinn::ServerConfig::with_crypto(sync::Arc::new(tls_config));
-
-		// Enable BBR congestion control
-		// TODO validate the implementation
-		let mut transport_config = quinn::TransportConfig::default();
-		transport_config.keep_alive_interval(Some(time::Duration::from_secs(2)));
-		transport_config.congestion_controller_factory(sync::Arc::new(quinn::congestion::BbrConfig::default()));
-
-		server_config.transport = sync::Arc::new(transport_config);
-		let server = quinn::Endpoint::server(server_config, config.addr)?;
-		let broker = config.broker;
-
-		let server = moq_transport_quinn::Server::new(server);
-		let tasks = JoinSet::new();
-
-		Ok(Self { server, broker, tasks })
-	}
-
-	pub async fn run(mut self) -> anyhow::Result<()> {
-		loop {
-			tokio::select! {
-				res = self.server.accept() => {
-					let session = res.context("failed to accept connection")?;
-					let broker = self.broker.clone();
-
-					self.tasks.spawn(async move {
-						let session: Session = Session::accept(session, broker).await?;
-						session.run().await
-					});
-				},
-				res = self.tasks.join_next(), if !self.tasks.is_empty() => {
-					let res = res.expect("no tasks").expect("task aborted");
-
-					if let Err(err) = res {
-						log::error!("session terminated: {:?}", err);
-					}
-				},
-			}
-		}
-	}
-}

moq-warp/src/relay/session.rs

@@ -1,49 +1,26 @@
-use anyhow::Context;
+use webtransport_generic::{SendStream, Connection, RecvStream};
 
 use super::{broker, contribute, control, distribute};
 
-use moq_transport::{Role, SetupServer, Version};
-use moq_transport_quinn::Connect;
 
-pub struct Session {
+pub struct Session<C: Connection + Send> {
 	// Split logic into contribution/distribution to reduce the problem space.
-	contribute: contribute::Session,
+	contribute: contribute::Session<C>,
-	distribute: distribute::Session,
+	distribute: distribute::Session<C>,
 
 	// Used to receive control messages and forward to contribute/distribute.
-	control: control::Main,
+	control: control::Main<C::SendStream, C::RecvStream>,
 }
 
-impl Session {
+impl<R, S, C> Session<C> where
-	pub async fn accept(session: Connect, broker: broker::Broadcasts) -> anyhow::Result<Session> {
+	R: RecvStream + Send + 'static,
-		// Accep the WebTransport session.
+	S: SendStream + Send,
-		// OPTIONAL validate the conn.uri() otherwise call conn.reject()
+	C: Connection<RecvStream = R, SendStream = S> + Send + 'static
-		let session = session
+{
-			.accept()
+	pub async fn from_transport_session(
-			.await
+		session: moq_transport::Session<C>,
-			.context(": server::Setupfailed to accept WebTransport session")?;
+		broker: broker::Broadcasts,
-
+	) -> anyhow::Result<Session<C>> {
-		session
-			.setup()
-			.versions
-			.iter()
-			.find(|v| **v == Version::DRAFT_00)
-			.context("failed to find supported version")?;
-
-		// Choose our role based on the client's role.
-		let role = match session.setup().role {
-			Role::Publisher => Role::Subscriber,
-			Role::Subscriber => Role::Publisher,
-			Role::Both => Role::Both,
-		};
-
-		let setup = SetupServer {
-			version: Version::DRAFT_00,
-			role,
-		};
-
-		let session = session.accept(setup).await?;
-
 		let (control, objects) = session.split();
 		let (objects_send, objects_recv) = objects.split();