fix SDLUDPHole

Tun/Punchnet/Context/SDLContextActor.swift

@@ -111,7 +111,7 @@ actor SDLContextActor {
     private var ipv6AssistClient: SDLIPV6AssistClient?
 
     // 数据包读取任务
-    private var readTask: Task<(), Never>?
+    private var readTask: Task<Void, Error>?
     
     private let sessionManager = SessionManager()
     nonisolated private let arpServer: ArpServer
@@ -212,6 +212,7 @@ actor SDLContextActor {
         self.superMonitorTask = nil
         await superClient?.stop()
 
+        SDLLogger.log("[SDLContext] try to cancel readTask")
         self.readTask?.cancel()
         self.readTask = nil
         
@@ -937,26 +938,30 @@ extension SDLContextActor {
     
     // 开始读取数据, 用单独的线程处理packetFlow
     private func startReader() {
-        //  停止之前的任务
         self.readTask?.cancel()
-        
         // 开启新的任务
         let provider = self.provider
-        self.readTask = Task(priority: .high) {
-            repeat {
+        self.readTask = Task(priority: .high) { [weak self] in
+            try await withTaskCancellationHandler {
                 do {
+                    repeat {
                         try Task.checkCancellation()
                         let (packets, numbers) = await provider.packetFlow.readPackets()
                         try Task.checkCancellation()
                         for (data, number) in zip(packets, numbers) where number == 2 {
                             if let ipPacket = IPPacket(data) {
-                            await self.dealTunPacket(packet: ipPacket)
+                                await self?.dealTunPacket(packet: ipPacket)
                             }
                         }
-                } catch let err {
-                    SDLLogger.log("[SDLContext] readTask catch error: \(err)")
-                }
                     } while true
+                    SDLLogger.log("[SDLContext] readTask finish")
+                } catch let err {
+                    SDLLogger.log("[SDLContext] readTask catch error: \(err)")
+                    throw err
+                }
+            } onCancel: {
+                SDLLogger.log("[SDLContext] readTask onCancel")
+            }
         }
     }