refactoring conn audit, add session_id (both session_id and conn_id on

sever side), use session_id instead of conn_id for client id, and remove
conn_id in protobuf

libs/hbb_common/protos/message.proto

@@ -97,7 +97,6 @@ message PeerInfo {
   int32 current_display = 5;
   bool sas_enabled = 6;
   string version = 7;
-  int32 conn_id = 8;
   Features features = 9;
   SupportedEncoding encoding = 10;
   SupportedResolutions resolutions = 11;

src/client.rs

@@ -1073,9 +1073,8 @@ pub struct LoginConfigHandler {
     config: PeerConfig,
     pub port_forward: (String, i32),
     pub version: i64,
-    pub conn_id: i32,
     features: Option<Features>,
-    session_id: u64,
+    pub session_id: u64, // used for local <-> server communication
     pub supported_encoding: SupportedEncoding,
     pub restarting_remote_device: bool,
     pub force_relay: bool,
@@ -1123,7 +1122,11 @@ impl LoginConfigHandler {
         let config = self.load_config();
         self.remember = !config.password.is_empty();
         self.config = config;
-        self.session_id = rand::random();
+        let mut sid = rand::random();
+        if sid == 0 { // you won the lottery
+            sid = 1;
+        }
+        self.session_id = sid;
         self.supported_encoding = Default::default();
         self.restarting_remote_device = false;
         self.force_relay = !self.get_option("force-always-relay").is_empty() || force_relay;
@@ -1669,7 +1672,6 @@ impl LoginConfigHandler {
                 config.keyboard_mode = KeyboardMode::Legacy.to_string();
             }
         }
-        self.conn_id = pi.conn_id;
         // no matter if change, for update file time
         self.save_config(config);
         self.supported_encoding = pi.encoding.clone().unwrap_or_default();

src/client/io_loop.rs

@@ -1415,11 +1415,8 @@ impl<T: InvokeUiSession> Remote<T> {
                         }
                     }
                 }
-                Some(message::Union::PeerInfo(pi)) => match pi.conn_id {
-                    crate::SYNC_PEER_INFO_DISPLAYS => {
-                        self.handler.set_displays(&pi.displays);
-                    }
-                    _ => {}
+                Some(message::Union::PeerInfo(pi)) => {
+                    self.handler.set_displays(&pi.displays);
                 },
                 _ => {}
             }

src/common.rs

@@ -39,8 +39,6 @@ pub type NotifyMessageBox = fn(String, String, String, String) -> dyn Future<Out
 pub const CLIPBOARD_NAME: &'static str = "clipboard";
 pub const CLIPBOARD_INTERVAL: u64 = 333;
 
-pub const SYNC_PEER_INFO_DISPLAYS: i32 = 1;
-
 #[cfg(all(target_os = "macos", feature = "flutter_texture_render"))]
 // https://developer.apple.com/forums/thread/712709
 // Memory alignment should be multiple of 64.

src/server.rs

@@ -90,7 +90,7 @@ pub fn new() -> ServerPtr {
     let mut server = Server {
         connections: HashMap::new(),
         services: HashMap::new(),
-        id_count: 0,
+        id_count: hbb_common::rand::random::<i32>() % 1000,
     };
     server.add_service(Box::new(audio_service::new()));
     server.add_service(Box::new(video_service::new()));

src/server/connection.rs

@@ -192,6 +192,7 @@ pub struct Connection {
     #[cfg(all(target_os = "linux", feature = "linux_headless"))]
     #[cfg(not(any(feature = "flatpak", feature = "appimage")))]
     tx_desktop_ready: mpsc::Sender<()>,
+    closed: bool,
 }
 
 impl ConnInner {
@@ -320,8 +321,10 @@ impl Connection {
             #[cfg(all(target_os = "linux", feature = "linux_headless"))]
             #[cfg(not(any(feature = "flatpak", feature = "appimage")))]
             tx_desktop_ready: _tx_desktop_ready,
+            closed: false,
         };
         if !conn.on_open(addr).await {
+            conn.closed = true;
             // sleep to ensure msg got received.
             sleep(1.).await;
             return;
@@ -563,7 +566,7 @@ impl Connection {
                             match &m.union {
                                 Some(misc::Union::StopService(_)) => {
                                     conn.send_close_reason_no_retry("").await;
-                                    conn.on_close("stop service", true).await;
+                                    conn.on_close("stop service", false).await;
                                     break;
                                 }
                                 _ => {},
@@ -634,6 +637,7 @@ impl Connection {
             #[cfg(not(any(target_os = "android", target_os = "ios")))]
             try_stop_record_cursor_pos();
         }
+        conn.on_close("End", true).await;
         log::info!("#{} connection loop exited", id);
     }
 
@@ -867,6 +871,7 @@ impl Connection {
         v["id"] = json!(Config::get_id());
         v["uuid"] = json!(crate::encode64(hbb_common::get_uuid()));
         v["conn_id"] = json!(self.inner.id);
+        v["session_id"] = json!(self.lr.session_id);
         tokio::spawn(async move {
             allow_err!(Self::post_audit_async(url, v).await);
         });
@@ -948,7 +953,6 @@ impl Connection {
         let mut res = LoginResponse::new();
         let mut pi = PeerInfo {
             username: username.clone(),
-            conn_id: self.inner.id,
             version: VERSION.to_owned(),
             ..Default::default()
         };
@@ -1228,6 +1232,7 @@ impl Connection {
             .lock()
             .unwrap()
             .retain(|_, s| s.last_recv_time.lock().unwrap().elapsed() < SESSION_TIMEOUT);
+        // last_recv_time is a mutex variable shared with connection, can be updated lively.
         if let Some(session) = session {
             if session.name == self.lr.my_name
                 && session.session_id == self.lr.session_id
@@ -2179,6 +2184,10 @@ impl Connection {
     }
 
     async fn on_close(&mut self, reason: &str, lock: bool) {
+        if self.closed {
+            return;
+        }
+        self.closed = true;
         log::info!("#{} Connection closed: {}", self.inner.id(), reason);
         if lock && self.lock_after_session_end && self.keyboard {
             #[cfg(not(any(target_os = "android", target_os = "ios")))]

src/server/video_service.rs

@@ -484,7 +484,6 @@ fn check_get_displays_changed_msg() -> Option<Message> {
     let displays = check_displays_new()?;
     let (current, displays) = get_displays_2(&displays);
     let mut pi = PeerInfo {
-        conn_id: crate::SYNC_PEER_INFO_DISPLAYS,
         ..Default::default()
     };
     pi.displays = displays.clone();

src/tray.rs

@@ -61,7 +61,7 @@ pub fn make_tray() -> hbb_common::ResultType<()> {
     let mut docker_hiden = false;
 
     let open_func = move || {
-        #[cfg(not(feature = "flutter"))]
+        if cfg!(not(feature = "flutter"))
         {
         crate::run_me::<&str>(vec![]).ok();
         return;

src/ui_session_interface.rs

@@ -49,7 +49,7 @@ const CHANGE_RESOLUTION_VALID_TIMEOUT_SECS: u64 = 15;
 
 #[derive(Clone, Default)]
 pub struct Session<T: InvokeUiSession> {
-    pub session_id: SessionID,
+    pub session_id: SessionID, // different from the one in LoginConfigHandler, used for flutter UI message pass
     pub id: String, // peer id
     pub password: String,
     pub args: Vec<String>,
@@ -312,8 +312,7 @@ impl<T: InvokeUiSession> Session<T> {
     }
 
     pub fn get_audit_server(&self, typ: String) -> String {
-        if self.lc.read().unwrap().conn_id <= 0
-            || LocalConfig::get_option("access_token").is_empty()
+        if LocalConfig::get_option("access_token").is_empty()
         {
             return "".to_owned();
         }
@@ -327,9 +326,9 @@ impl<T: InvokeUiSession> Session<T> {
     pub fn send_note(&self, note: String) {
         let url = self.get_audit_server("conn".to_string());
         let id = self.id.clone();
-        let conn_id = self.lc.read().unwrap().conn_id;
+        let session_id = self.lc.read().unwrap().session_id;
         std::thread::spawn(move || {
-            send_note(url, id, conn_id, note);
+            send_note(url, id, session_id, note);
         });
     }
 
@@ -1347,7 +1346,7 @@ async fn start_one_port_forward<T: InvokeUiSession>(
 }
 
 #[tokio::main(flavor = "current_thread")]
-async fn send_note(url: String, id: String, conn_id: i32, note: String) {
-    let body = serde_json::json!({ "id": id, "conn_id": conn_id, "note": note });
+async fn send_note(url: String, id: String, sid: u64, note: String) {
+    let body = serde_json::json!({ "id": id, "session_id": sid, "note": note });
     allow_err!(crate::post_request(url, body.to_string(), "").await);
 }