improve network error handling

src/common/mainloop.rs

@@ -5,13 +5,38 @@ use async_std::io::prelude::{ReadExt, WriteExt};
 use async_std::prelude::{StreamExt};
 use std::collections::HashMap;
 
-use libpso::crypto::{PSOCipher, NullCipher};
+use libpso::crypto::{PSOCipher, NullCipher, CipherError};
+use libpso::PacketParseError;
 use crate::common::serverstate::ClientId;
 use crate::common::serverstate::{RecvServerPacket, SendServerPacket, ServerState, OnConnect};
 
 
-enum PacketReceiverError {
-    ClientDisconnect,
+#[derive(Debug)]
+pub enum NetworkError {
+    CouldNotSend,
+    CipherError(CipherError),
+    PacketParseError(PacketParseError),
+    IOError(std::io::Error),
+    DataNotReady,
+    ClientDisconnected,
+}
+
+impl From<CipherError> for NetworkError {
+    fn from(err: CipherError) -> NetworkError {
+        NetworkError::CipherError(err)
+    }
+}
+
+impl From<std::io::Error> for NetworkError {
+    fn from(err: std::io::Error) -> NetworkError {
+        NetworkError::IOError(err)
+    }
+}
+
+impl From<PacketParseError> for NetworkError {
+    fn from(err: PacketParseError) -> NetworkError {
+        NetworkError::PacketParseError(err)
+    }
 }
 
 struct PacketReceiver {
@@ -31,13 +56,13 @@ impl PacketReceiver {
         }
     }
 
-    async fn fill_recv_buffer(&mut self) -> Result<(), PacketReceiverError>{
+    async fn fill_recv_buffer(&mut self) -> Result<(), NetworkError> {
         let mut data = [0u8; 0x8000];
 
         let mut socket = &*self.socket;
-        let len = socket.read(&mut data).await.unwrap();
+        let len = socket.read(&mut data).await?;
         if len == 0 {
-            return Err(PacketReceiverError::ClientDisconnect);
+            return Err(NetworkError::ClientDisconnected);
         }
 
         self.recv_buffer.extend_from_slice(&mut data[..len]);
@@ -46,14 +71,14 @@ impl PacketReceiver {
             let mut cipher = self.cipher.lock().await;
             let block_chunk_len = self.recv_buffer.len() / cipher.block_size() * cipher.block_size();
             let buf = self.recv_buffer.drain(..block_chunk_len).collect();
-            cipher.decrypt(&buf).unwrap()
+            cipher.decrypt(&buf)?
         };
         self.incoming_data.append(&mut dec_buf);
 
         Ok(())
     }
 
-    async fn recv_pkts<R: RecvServerPacket + Send + std::fmt::Debug>(&mut self) -> Result<Vec<R>, PacketReceiverError> {
+    async fn recv_pkts<R: RecvServerPacket + Send + std::fmt::Debug>(&mut self) -> Result<Vec<R>, NetworkError> {
         self.fill_recv_buffer().await?;
 
         let mut result = Vec::new();
@@ -89,12 +114,15 @@ impl PacketReceiver {
     }
 }
 
-async fn send_pkt<S: SendServerPacket + Send + std::fmt::Debug>(socket: Arc<async_std::net::TcpStream>, cipher: Arc<Mutex<Box<dyn PSOCipher + Send>>>, pkt: S) {
+async fn send_pkt<S: SendServerPacket + Send + std::fmt::Debug>(socket: Arc<async_std::net::TcpStream>,
+                                                                cipher: Arc<Mutex<Box<dyn PSOCipher + Send>>>, pkt: S)
+                                                                -> Result<(), NetworkError>
+{
     let buf = pkt.as_bytes();
-    let cbuf = cipher.lock().await.encrypt(&buf).unwrap();
+    let cbuf = cipher.lock().await.encrypt(&buf)?;
     let mut ssock = &*socket;
-    ssock.write_all(&cbuf).await;
-
+    ssock.write_all(&cbuf).await?;
+    Ok(())
 }
 
 
@@ -118,7 +146,7 @@ async fn server_state_loop<STATE, S, R, E>(mut state: STATE,
     E: std::fmt::Debug + Send,
 {
     async_std::task::spawn(async move {
-       let mut clients = HashMap::new();
+        let mut clients = HashMap::new();
 
         loop {
             let action = server_state_receiver.recv().await.unwrap();
@@ -138,22 +166,31 @@ async fn server_state_loop<STATE, S, R, E>(mut state: STATE,
                     }
                 },
                 ClientAction::Packet(client_id, pkt) => {
-                    let k = state.handle(client_id, &pkt);
-                    let pkts = k.unwrap().collect::<Vec<_>>();
-                    for (client_id, pkt) in pkts {
-                        let client = clients.get_mut(&client_id).unwrap();
-                        client.send(ServerStateAction::Packet(pkt)).await;
+                    let pkts = state.handle(client_id, &pkt);
+                    match pkts {
+                        Ok(pkts) => {
+                            for (client_id, pkt) in pkts {
+                                if let Some(client) = clients.get_mut(&client_id) {
+                                    client.send(ServerStateAction::Packet(pkt)).await;
+                                }
+                            }
+                        },
+                        Err(err) => {
+                            warn!("[client {:?} state handler error] {:?}", client_id, err);
+                        }
                     }
                 },
                 ClientAction::Disconnect(client_id) => {
                     let pkts = state.on_disconnect(client_id);
                     for (client_id, pkt) in pkts {
-                        let client = clients.get_mut(&client_id).unwrap();
-                        client.send(ServerStateAction::Packet(pkt)).await;
+                        if let Some(client) = clients.get_mut(&client_id) {
+                            client.send(ServerStateAction::Packet(pkt)).await;
+                        }
                     }
 
-                    let client = clients.remove(&client_id).unwrap();
-                    client.send(ServerStateAction::Disconnect).await;
+                    if let Some(client) = clients.get_mut(&client_id) {
+                        client.send(ServerStateAction::Disconnect).await;
+                    }
                 }
             }
         }
@@ -182,11 +219,14 @@ async fn client_recv_loop<S, R>(client_id: ClientId,
                 },
                 Err(err) => {
                     match err {
-                        PacketReceiverError::ClientDisconnect => {
+                        NetworkError::ClientDisconnected => {
                             trace!("[client disconnected] {:?}", client_id);
                             server_sender.send(ClientAction::Disconnect(client_id));
                             break;
                         }
+                        _ => {
+                            warn!("[client {:?} recv error] {:?}", client_id, err);
+                        }
                     }
                 }
             }
@@ -213,7 +253,9 @@ async fn client_send_loop<S>(client_id: ClientId,
                 }
                 ServerStateAction::Packet(pkt) => {
                     trace!("[send to {:?}] {:?}", client_id, pkt);
-                    send_pkt(socket.clone(), cipher_out.clone(), pkt).await
+                    if let Err(err) = send_pkt(socket.clone(), cipher_out.clone(), pkt).await {
+                        warn!("[client {:?} send error ] {:?}", client_id, err);
+                    }
                 },
                 ServerStateAction::Disconnect => {
                     break;

src/common/mod.rs

@@ -1,5 +1,4 @@
 pub mod cipherkeys;
-pub mod network;
 pub mod serverstate;
 pub mod mainloop;
 pub mod leveltable;

src/common/network.rs

@@ -1,33 +0,0 @@
-use std::io::{Read};
-use log::trace;
-
-use libpso::crypto::{PSOCipher, CipherError};
-use libpso::PacketParseError;
-
-#[derive(Debug)]
-pub enum PacketNetworkError {
-    CouldNotSend,
-    CipherError(CipherError),
-    PacketParseError(PacketParseError),
-    IOError(std::io::Error),
-    DataNotReady,
-    ClientDisconnected,
-}
-
-impl From<CipherError> for PacketNetworkError {
-    fn from(err: CipherError) -> PacketNetworkError {
-        PacketNetworkError::CipherError(err)
-    }
-}
-
-impl From<std::io::Error> for PacketNetworkError {
-    fn from(err: std::io::Error) -> PacketNetworkError {
-        PacketNetworkError::IOError(err)
-    }
-}
-
-impl From<PacketParseError> for PacketNetworkError {
-    fn from(err: PacketParseError) -> PacketNetworkError {
-        PacketNetworkError::PacketParseError(err)
-    }
-}

src/patch/patch.rs

@@ -11,18 +11,18 @@ use libpso::crypto::pc::PSOPCCipher;
 use ron::de::from_str;
 use serde::Deserialize;
 
-use crate::common::network::{PacketNetworkError};
+use crate::common::mainloop::{NetworkError};
 use crate::common::serverstate::{RecvServerPacket, SendServerPacket, ServerState, OnConnect, ClientId};
 
 #[derive(Debug)]
 pub enum PatchError {
-    PacketNetworkError(PacketNetworkError),
+    NetworkError(NetworkError),
     IOError(std::io::Error),
 }
 
-impl From<PacketNetworkError> for PatchError {
-    fn from(err: PacketNetworkError) -> PatchError {
-        PatchError::PacketNetworkError(err)
+impl From<NetworkError> for PatchError {
+    fn from(err: NetworkError) -> PatchError {
+        PatchError::NetworkError(err)
     }
 }