1 files changed, 214 insertions, 0 deletions
diff --git a/src/netapp.rs b/src/netapp.rs
new file mode 100644
index 0000000..6f174b4
--- /dev/null
+++ b/src/netapp.rs
@@ -0,0 +1,214 @@
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::pin::Pin;
+use std::sync::{Arc, RwLock};
+
+use std::future::Future;
+
+use log::{debug, info};
+
+use arc_swap::{ArcSwap, ArcSwapOption};
+use bytes::Bytes;
+
+use sodiumoxide::crypto::auth;
+use sodiumoxide::crypto::sign::ed25519;
+use tokio::net::{TcpListener, TcpStream};
+
+use crate::conn::*;
+use crate::error::*;
+use crate::message::*;
+use crate::proto::*;
+use crate::util::*;
+
+pub struct NetApp {
+	pub listen_addr: SocketAddr,
+	pub netid: auth::Key,
+	pub pubkey: ed25519::PublicKey,
+	pub privkey: ed25519::SecretKey,
+	pub server_conns: RwLock<HashMap<ed25519::PublicKey, Arc<ServerConn>>>,
+	pub client_conns: RwLock<HashMap<ed25519::PublicKey, Arc<ClientConn>>>,
+	pub(crate) msg_handlers: ArcSwap<
+		HashMap<
+			MessageKind,
+			Arc<
+				dyn Fn(
+						ed25519::PublicKey,
+						Bytes,
+					) -> Pin<Box<dyn Future<Output = Vec<u8>> + Sync + Send>>
+					+ Sync
+					+ Send,
+			>,
+		>,
+	>,
+	pub(crate) on_connected:
+		ArcSwapOption<Box<dyn Fn(ed25519::PublicKey, SocketAddr, bool) + Send + Sync>>,
+	pub(crate) on_disconnected: ArcSwapOption<Box<dyn Fn(ed25519::PublicKey, bool) + Send + Sync>>,
+}
+
+async fn handler_aux<M, F, R>(handler: Arc<F>, remote: ed25519::PublicKey, bytes: Bytes) -> Vec<u8>
+where
+	M: Message + 'static,
+	F: Fn(ed25519::PublicKey, M) -> R + Send + Sync + 'static,
+	R: Future<Output = Result<<M as Message>::Response, Error>> + Send + Sync,
+{
+	debug!(
+		"Handling message of kind {:08x} from {}",
+		M::KIND,
+		hex::encode(remote)
+	);
+	let res = match rmp_serde::decode::from_read_ref::<_, M>(&bytes[..]) {
+		Ok(msg) => handler(remote.clone(), msg).await,
+		Err(e) => Err(e.into()),
+	};
+	let res = res.map_err(|e| format!("{}", e));
+	rmp_to_vec_all_named(&res).unwrap_or(vec![])
+}
+
+impl NetApp {
+	pub fn new(
+		listen_addr: SocketAddr,
+		netid: auth::Key,
+		privkey: ed25519::SecretKey,
+	) -> Arc<Self> {
+		let pubkey = privkey.public_key();
+		let netapp = Arc::new(Self {
+			listen_addr,
+			netid,
+			pubkey,
+			privkey,
+			server_conns: RwLock::new(HashMap::new()),
+			client_conns: RwLock::new(HashMap::new()),
+			msg_handlers: ArcSwap::new(Arc::new(HashMap::new())),
+			on_connected: ArcSwapOption::new(None),
+			on_disconnected: ArcSwapOption::new(None),
+		});
+
+		let netapp2 = netapp.clone();
+		netapp.add_msg_handler::<HelloMessage, _, _>(
+			move |from: ed25519::PublicKey, msg: HelloMessage| {
+				netapp2.handle_hello_message(from, msg);
+				async { Ok(()) }
+			},
+		);
+
+		netapp
+	}
+
+	pub fn add_msg_handler<M, F, R>(&self, handler: F)
+	where
+		M: Message + 'static,
+		F: Fn(ed25519::PublicKey, M) -> R + Send + Sync + 'static,
+		R: Future<Output = Result<<M as Message>::Response, Error>> + Send + Sync + 'static,
+	{
+		let handler = Arc::new(handler);
+		let fun = Arc::new(move |remote: ed25519::PublicKey, bytes: Bytes| {
+			let fun: Pin<Box<dyn Future<Output = Vec<u8>> + Sync + Send>> =
+				Box::pin(handler_aux(handler.clone(), remote, bytes));
+			fun
+		});
+		let mut handlers = self.msg_handlers.load().as_ref().clone();
+		handlers.insert(M::KIND, fun);
+		self.msg_handlers.store(Arc::new(handlers));
+	}
+
+	pub async fn listen(self: Arc<Self>) {
+		let mut listener = TcpListener::bind(self.listen_addr).await.unwrap();
+		info!("Listening on {}", self.listen_addr);
+
+		loop {
+			// The second item contains the IP and port of the new connection.
+			let (socket, _) = listener.accept().await.unwrap();
+			info!(
+				"Incoming connection from {}, negotiating handshake...",
+				socket.peer_addr().unwrap()
+			);
+			let self2 = self.clone();
+			tokio::spawn(async move {
+				ServerConn::run(self2, socket)
+					.await
+					.log_err("ServerConn::run");
+			});
+		}
+	}
+
+	pub async fn try_connect(
+		self: Arc<Self>,
+		ip: SocketAddr,
+		pk: ed25519::PublicKey,
+	) -> Result<(), Error> {
+		if self.client_conns.read().unwrap().contains_key(&pk) {
+			return Ok(());
+		}
+		let socket = TcpStream::connect(ip).await?;
+		info!("Connected to {}, negotiating handshake...", ip);
+		ClientConn::init(self, socket, pk.clone()).await?;
+		Ok(())
+	}
+
+	pub fn disconnect(self: Arc<Self>, id: &ed25519::PublicKey) {
+		let conn = self.client_conns.read().unwrap().get(id).cloned();
+		if let Some(c) = conn {
+			c.close();
+		}
+	}
+
+	pub(crate) fn connected_as_server(&self, id: ed25519::PublicKey, conn: Arc<ServerConn>) {
+		let mut conn_list = self.server_conns.write().unwrap();
+		conn_list.insert(id.clone(), conn);
+	}
+
+	fn handle_hello_message(&self, id: ed25519::PublicKey, msg: HelloMessage) {
+		if let Some(h) = self.on_connected.load().as_ref() {
+			if let Some(c) = self.server_conns.read().unwrap().get(&id) {
+				let remote_addr = SocketAddr::new(c.remote_addr.ip(), msg.server_port);
+				h(id, remote_addr, true);
+			}
+		}
+	}
+
+	pub(crate) fn disconnected_as_server(&self, id: &ed25519::PublicKey, conn: Arc<ServerConn>) {
+		let mut conn_list = self.server_conns.write().unwrap();
+		if let Some(c) = conn_list.get(id) {
+			if Arc::ptr_eq(c, &conn) {
+				conn_list.remove(id);
+			}
+
+			if let Some(h) = self.on_disconnected.load().as_ref() {
+				h(conn.peer_pk, true);
+			}
+		}
+	}
+
+	pub(crate) fn connected_as_client(&self, id: ed25519::PublicKey, conn: Arc<ClientConn>) {
+		{
+			let mut conn_list = self.client_conns.write().unwrap();
+			if let Some(old_c) = conn_list.insert(id.clone(), conn.clone()) {
+				tokio::spawn(async move { old_c.close() });
+			}
+		}
+
+		if let Some(h) = self.on_connected.load().as_ref() {
+			h(conn.peer_pk, conn.remote_addr, false);
+		}
+
+		tokio::spawn(async move {
+			let server_port = conn.netapp.listen_addr.port();
+			conn.request(HelloMessage { server_port }, prio::NORMAL)
+				.await
+				.log_err("Sending hello message");
+		});
+	}
+
+	pub(crate) fn disconnected_as_client(&self, id: &ed25519::PublicKey, conn: Arc<ClientConn>) {
+		let mut conn_list = self.client_conns.write().unwrap();
+		if let Some(c) = conn_list.get(id) {
+			if Arc::ptr_eq(c, &conn) {
+				conn_list.remove(id);
+			}
+
+			if let Some(h) = self.on_disconnected.load().as_ref() {
+				h(conn.peer_pk, false);
+			}
+		}
+	}
+}