优化连接处理逻辑，增加超时设置；重构命令读取与错误处理；新增公共工具函数以简化错误处理

utils/conn.go

@@ -0,0 +1,41 @@
+package utils
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"syscall"
+)
+
+func WarpConnErr(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	var opErr *net.OpError
+	switch {
+
+	case errors.Is(err, net.ErrClosed):
+		slog.Debug("连接已关闭")
+		return nil
+
+	case errors.Is(err, io.EOF):
+		slog.Debug("连接被对端关闭")
+		return nil
+
+	case errors.As(err, &opErr):
+		switch {
+		case
+			errors.Is(opErr.Err, syscall.WSAECONNRESET), errors.Is(opErr.Err, syscall.WSAECONNABORTED),
+			errors.Is(opErr.Err, syscall.ECONNRESET), errors.Is(opErr.Err, syscall.ECONNABORTED):
+			slog.Debug("连接被对端重置")
+			return nil
+		case opErr.Timeout():
+			slog.Debug("连接已超时")
+			return nil
+		}
+	}
+	return fmt.Errorf("连接发生未处理的错误: %w", err)
+}