1 files changed, 171 insertions, 0 deletions
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..73ae267
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,171 @@
+use std::net::SocketAddr;
+use std::sync::{Arc};
+
+use bytes::Bytes;
+use log::{debug, trace};
+
+use tokio::net::TcpStream;
+use tokio::sync::{mpsc, watch};
+use tokio_util::compat::*;
+
+use futures::io::AsyncReadExt;
+
+use async_trait::async_trait;
+
+use kuska_handshake::async_std::{handshake_server, BoxStream};
+
+use crate::error::*;
+use crate::netapp::*;
+use crate::proto::*;
+use crate::util::*;
+
+// The client and server connection structs (client.rs and server.rs)
+// build upon the chunking mechanism which is exclusively contained
+// in proto.rs.
+// Here, we just care about sending big messages without size limit.
+// The format of these messages is described below.
+// Chunking happens independently.
+
+// Request message format (client -> server):
+// - u8 priority
+// - u8 path length
+// - [u8; path length] path
+// - [u8; *] data
+
+// Response message format (server -> client):
+// - u8 response code
+// - [u8; *] response
+
+pub(crate) struct ServerConn {
+	pub(crate) remote_addr: SocketAddr,
+	pub(crate) peer_id: NodeID,
+
+	netapp: Arc<NetApp>,
+
+	resp_send: mpsc::UnboundedSender<Option<(RequestID, RequestPriority, Vec<u8>)>>,
+	close_send: watch::Sender<bool>,
+}
+
+impl ServerConn {
+	pub(crate) async fn run(netapp: Arc<NetApp>, socket: TcpStream) -> Result<(), Error> {
+		let remote_addr = socket.peer_addr()?;
+		let mut socket = socket.compat();
+
+		let handshake = handshake_server(
+			&mut socket,
+			netapp.netid.clone(),
+			netapp.id,
+			netapp.privkey.clone(),
+		)
+		.await?;
+		let peer_id = handshake.peer_pk;
+
+		debug!(
+			"Handshake complete (server) 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 (resp_send, resp_recv) = mpsc::unbounded_channel();
+
+		let (close_send, close_recv) = watch::channel(false);
+
+		let conn = Arc::new(ServerConn {
+			netapp: netapp.clone(),
+			remote_addr,
+			peer_id,
+			resp_send,
+			close_send,
+		});
+
+		netapp.connected_as_server(peer_id, conn.clone());
+
+		let conn2 = conn.clone();
+		let conn3 = conn.clone();
+		let close_recv2 = close_recv.clone();
+		tokio::try_join!(
+			async move {
+				tokio::select!(
+					r = conn2.recv_loop(read) => r,
+					_ = await_exit(close_recv) => Ok(()),
+				)
+			},
+			async move {
+				tokio::select!(
+					r = conn3.send_loop(resp_recv, write) => r,
+					_ = await_exit(close_recv2) => Ok(()),
+				)
+			},
+		)
+		.map(|_| ())
+		.log_err("ServerConn recv_loop/send_loop");
+
+		netapp.disconnected_as_server(&peer_id, conn);
+
+		Ok(())
+	}
+
+	pub fn close(&self) {
+		self.close_send.send(true).unwrap();
+	}
+
+	async fn recv_handler_aux(self: &Arc<Self>, bytes: &[u8]) -> Result<Vec<u8>, Error> {
+		if bytes.len() < 2 {
+			return Err(Error::Message("Invalid protocol message".into()));
+		}
+
+		// byte 0 is the request priority, we don't care here
+		let path_length = bytes[1] as usize;
+		if bytes.len() < 2 + path_length {
+			return Err(Error::Message("Invalid protocol message".into()));
+		}
+
+		let path = &bytes[2..2 + path_length];
+		let path = String::from_utf8(path.to_vec())?;
+		let data = &bytes[2 + path_length..];
+
+		let handler_opt = {
+			let endpoints = self.netapp.endpoints.read().unwrap();
+			endpoints.get(&path).map(|e| e.clone_endpoint())
+		};
+
+		if let Some(handler) = handler_opt {
+			handler.handle(data, self.peer_id).await
+		} else {
+			Err(Error::NoHandler)
+		}
+	}
+}
+
+impl SendLoop for ServerConn {}
+
+#[async_trait]
+impl RecvLoop for ServerConn {
+	async fn recv_handler(self: Arc<Self>, id: RequestID, bytes: Vec<u8>) {
+		trace!("ServerConn recv_handler {} ({} bytes)", id, bytes.len());
+		let bytes: Bytes = bytes.into();
+
+		let resp = self.recv_handler_aux(&bytes[..]).await;
+		let prio = bytes[0];
+
+		let mut resp_bytes = vec![];
+		match resp {
+			Ok(rb) => {
+				resp_bytes.push(0u8);
+				resp_bytes.extend(&rb[..]);
+			}
+			Err(e) => {
+				resp_bytes.push(e.code());
+			}
+		}
+
+		self.resp_send
+			.send(Some((id, prio, resp_bytes)))
+			.log_err("ServerConn recv_handler send resp");
+	}
+}