From f92e9f6f07b1e3834c2ca58ce3510734819d08e4 Mon Sep 17 00:00:00 2001
From: Arne Dußin
Date: Wed, 27 Jan 2021 14:01:50 +0100
Subject: Rework graf karto to fit the client/server structure

---
 src/net/server/connection.rs | 84 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/net/server/connection.rs

(limited to 'src/net/server/connection.rs')

diff --git a/src/net/server/connection.rs b/src/net/server/connection.rs
new file mode 100644
index 0000000..801eb4b
--- /dev/null
+++ b/src/net/server/connection.rs
@@ -0,0 +1,84 @@
+//! A TCP-connection from a client to the server.
+
+use super::super::packet::{Packet, PacketRwError};
+use super::connection_manager::ConnId;
+use serde::de::DeserializeOwned;
+use serde::Serialize;
+use std::fmt::Debug;
+use std::net::TcpStream;
+use std::sync::mpsc::Sender;
+use std::thread::{self, JoinHandle};
+
+/// Holds a stream to the client and manages receiving packets from said client
+/// in an extra thread.
+pub struct Connection {
+    stream: TcpStream,
+    rcv_thread_handle: JoinHandle<()>,
+}
+
+impl Connection {
+    /// Start up the receiving thread after a client connection has been detected.
+    /// Will create a ghost disconnect packet in case the client disconnects.
+    pub(super) fn start_rcv<P>(
+        conn_id: ConnId,
+        stream: TcpStream,
+        packet_tx: Sender<(ConnId, Packet<P>)>,
+    ) -> Self
+    where
+        P: 'static + Debug + Send + DeserializeOwned + Serialize,
+    {
+        let mut stream_cl = stream
+            .try_clone()
+            .expect("Unable to clone TcpStream handle");
+        let rcv_thread_handle = thread::spawn(move || {
+            let mut running = true;
+            while running {
+                // Read the newest packet from the stream.
+                let packet = match Packet::read_from_stream(&mut stream_cl) {
+                    Ok(packet) => dbg!(packet),
+                    Err(PacketRwError::Closed) => {
+                        // Stop the thread after this packet.
+                        running = false;
+
+                        /* Generate an internal disconnection packet, so the connection
+                         * manager can call cleanup code if necessary.
+                         */
+                        Packet::Disconnect
+                    }
+                    Err(err) => {
+                        error!(
+                            "Receiving packet failed. Connection `{}`. {:?}",
+                            conn_id, err
+                        );
+
+                        // Ignore the received data.
+                        continue;
+                    }
+                };
+
+                /* Try sending the packet to the Connection manager. If it has already
+                 * stopped and hung up on the channel, stop this receive thread as well.
+                 */
+                if packet_tx.send((conn_id, packet)).is_err() {
+                    info!("Shutting down connection `{}`", conn_id);
+                    running = false;
+                }
+            }
+
+            info!("Packet receive thread has stopped running.");
+        });
+
+        Self {
+            stream,
+            rcv_thread_handle,
+        }
+    }
+
+    /// Send a packet to the client via TCP.
+    pub(super) fn send<P>(&mut self, packet: &Packet<P>) -> Result<(), PacketRwError>
+    where
+        P: 'static + Debug + Send + DeserializeOwned + Serialize,
+    {
+        packet.write_to_stream(&mut self.stream)
+    }
+}
-- 
cgit v1.2.3-70-g09d2