1 files changed, 180 insertions, 0 deletions
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..a436d53
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,180 @@
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::sync::atomic::{self, AtomicBool, AtomicU32};
+use std::sync::{Arc, Mutex};
+
+use log::{debug, error, trace};
+
+use tokio::net::TcpStream;
+use tokio::sync::{mpsc, oneshot, watch};
+use tokio_util::compat::*;
+
+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::netapp::*;
+use crate::proto::*;
+use crate::util::*;
+
+
+pub(crate) struct ClientConn {
+	pub(crate) remote_addr: SocketAddr,
+	pub(crate) peer_id: NodeID,
+
+	query_send: mpsc::UnboundedSender<Option<(RequestID, RequestPriority, Vec<u8>)>>,
+
+	next_query_number: AtomicU32,
+	inflight: Mutex<HashMap<RequestID, oneshot::Sender<Vec<u8>>>>,
+	must_exit: AtomicBool,
+	stop_recv_loop: watch::Sender<bool>,
+}
+
+impl ClientConn {
+	pub(crate) async fn init(
+		netapp: Arc<NetApp>,
+		socket: TcpStream,
+		peer_id: NodeID,
+	) -> Result<(), Error> {
+		let remote_addr = socket.peer_addr()?;
+		let mut socket = socket.compat();
+
+		let handshake = handshake_client(
+			&mut socket,
+			netapp.netid.clone(),
+			netapp.id,
+			netapp.privkey.clone(),
+			peer_id,
+		)
+		.await?;
+
+		debug!(
+			"Handshake complete (client) with {}@{}",
+			hex::encode(&peer_id),
+			remote_addr
+		);
+
+		let (read, write) = socket.split();
+
+		let (read, write) =
+			BoxStream::from_handshake(read, write, handshake, 0x8000).split_read_write();
+
+		let (query_send, query_recv) = mpsc::unbounded_channel();
+
+		let (stop_recv_loop, stop_recv_loop_recv) = watch::channel(false);
+
+		let conn = Arc::new(ClientConn {
+			remote_addr,
+			peer_id,
+			next_query_number: AtomicU32::from(RequestID::default()),
+			query_send,
+			inflight: Mutex::new(HashMap::new()),
+			must_exit: AtomicBool::new(false),
+			stop_recv_loop,
+		});
+
+		netapp.connected_as_client(peer_id, conn.clone());
+
+		tokio::spawn(async move {
+			let conn2 = conn.clone();
+			let conn3 = conn.clone();
+			tokio::try_join!(conn2.send_loop(query_recv, write), async move {
+				tokio::select!(
+					r = conn3.recv_loop(read) => r,
+					_ = await_exit(stop_recv_loop_recv) => Ok(()),
+				)
+			})
+			.map(|_| ())
+			.log_err("ClientConn send_loop/recv_loop/dispatch_loop");
+
+			netapp.disconnected_as_client(&peer_id, conn);
+		});
+
+		Ok(())
+	}
+
+	pub fn close(&self) {
+		self.must_exit.store(true, atomic::Ordering::SeqCst);
+		self.query_send
+			.send(None)
+			.log_err("could not write None in query_send");
+		if self.inflight.lock().unwrap().is_empty() {
+			self.stop_recv_loop
+				.send(true)
+				.log_err("could not write true to stop_recv_loop");
+		}
+	}
+
+	pub(crate) async fn call<T>(
+		self: Arc<Self>,
+		rq: T,
+		path: &str,
+		prio: RequestPriority,
+	) -> Result<<T as Message>::Response, Error>
+	where
+		T: Message,
+	{
+		let id = self
+			.next_query_number
+			.fetch_add(1, atomic::Ordering::Relaxed);
+
+		let mut bytes = vec![prio, path.as_bytes().len() as u8];
+		bytes.extend_from_slice(path.as_bytes());
+		bytes.extend_from_slice(&rmp_to_vec_all_named(&rq)?[..]);
+
+		let (resp_send, resp_recv) = oneshot::channel();
+		let old = self.inflight.lock().unwrap().insert(id, resp_send);
+		if let Some(old_ch) = old {
+			error!(
+				"Too many inflight requests! RequestID collision. Interrupting previous request."
+			);
+			if old_ch.send(vec![]).is_err() {
+				debug!("Could not send empty response to collisionned request, probably because request was interrupted. Dropping response.");
+			}
+		}
+
+		trace!("request: query_send {}, {} bytes", id, bytes.len());
+		self.query_send.send(Some((id, prio, bytes)))?;
+
+		let resp = resp_recv.await?;
+		if resp.len() == 0 {
+			return Err(Error::Message("Response is 0 bytes, either a collision or a protocol error".into()));
+		}
+
+		let code = resp[0];
+		if code == 0 {
+			rmp_serde::decode::from_read_ref::<_, Result<<T as Message>::Response, String>>(
+				&resp[1..],
+			)?
+			.map_err(Error::Remote)
+		} else {
+			Err(Error::Remote(format!("Remote error code {}", code)))
+		}
+	}
+}
+
+impl SendLoop for ClientConn {}
+
+#[async_trait]
+impl RecvLoop for ClientConn {
+	async fn recv_handler(self: Arc<Self>, id: RequestID, msg: Vec<u8>) {
+		trace!("ClientConn recv_handler {} ({} bytes)", id, msg.len());
+
+		let mut inflight = self.inflight.lock().unwrap();
+		if let Some(ch) = inflight.remove(&id) {
+			if ch.send(msg).is_err() {
+				debug!("Could not send request response, probably because request was interrupted. Dropping response.");
+			}
+		}
+
+		if inflight.is_empty() && self.must_exit.load(atomic::Ordering::SeqCst) {
+			self.stop_recv_loop
+				.send(true)
+				.log_err("could not write true to stop_recv_loop");
+		}
+	}
+}