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-rw-r--r--src/server.rs171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/server.rs b/src/server.rs
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+++ b/src/server.rs
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+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");
+ }
+}