fix(watchdog): refactored tcp recvMsg function, now the watchdog can be connected correctly

- Refactor TCP message reading to use ReadBytes and TrimSpace for better reliability
- Add connection success logging in main.go
- Update .gitignore to include logs.db-journal

watchdog/tcpClient.go

@@ -7,6 +7,7 @@ import (
 	"super-frpc/postLog"
 	"sync"
 	"time"
+	"strings"
 )
 
 var (
@@ -81,56 +82,61 @@ func sendMsg(message string, target int) (string, error) {
 }
 
 func recvMsg() {
-	defer recvWg.Done()
+    defer recvWg.Done()
 
-	for {
-		tcpConnMutex.Lock()
-		if tcpConn == nil {
-			tcpConnMutex.Unlock()
-			return
-		}
-		conn := tcpConn
-		tcpConnMutex.Unlock()
+    tcpConnMutex.Lock()
+    if tcpConn == nil {
+        tcpConnMutex.Unlock()
+        return
+    }
+    conn := tcpConn
+    tcpConnMutex.Unlock()
 
-		select {
-		case <-stopRecvChan:
-			return
-		default:
-			conn.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
-			reader := bufio.NewReader(conn)
-			line, err := reader.ReadString('\n')
-			if err != nil {
-				if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
-					continue
-				}
-				tcpConnMutex.Lock()
-				if tcpConn != nil {
-					tcpConn.Close()
-					tcpConn = nil
-					isConnected = false
-				}
-				tcpConnMutex.Unlock()
-				return
-			}
+    reader := bufio.NewReader(conn)
 
-			line = line[:len(line)-1]
-			if len(line) > 0 {
-				select {
-				case recvChan <- line:
-				default:
-					select {
-					case <-recvChan:
-						recvChan <- line
-					default:
-					}
-				}
+    for {
+        select {
+        case <-stopRecvChan:
+            return
+        default:
+            conn.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
+            
+            // ⭐ 改为读取到换行符 \n 为止
+            data, err := reader.ReadBytes('\n')
+            
+            if len(data) > 0 {
+                // ⭐ 用 strings.TrimSpace 去掉末尾的 \n
+                line := strings.TrimSpace(string(data)) 
+                
+                if len(line) > 0 {
+                    select {
+                    case recvChan <- line:
+                    default:
+                    }
 
-				if len(line) > 0 && line != "success" && !isResponseMessage(line) {
-					postLog.Debug(fmt.Sprintf("[Watchdog] TCP Socket received message: %s", line))
-				}
-			}
-		}
-	}
+                    if !isResponseMessage(line) {
+                        postLog.Debug(fmt.Sprintf("[Watchdog] TCP Socket received message: %s", line))
+                    }
+                }
+            }
+
+            if err != nil {
+                if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+                    continue
+                }
+                
+                // 处理非超时的严重错误（如服务端断开）
+                tcpConnMutex.Lock()
+                if tcpConn != nil {
+                    tcpConn.Close()
+                    tcpConn = nil
+                    isConnected = false
+                }
+                tcpConnMutex.Unlock()
+                return 
+            }
+        }
+    }
 }
 
 func isResponseMessage(msg string) bool {