feat: 添加线程锁

GxPrint.py

@@ -20,7 +20,8 @@ from pystray import MenuItem
 import socket
 import logging
 from logging.handlers import RotatingFileHandler
-import sys
+import time
+import threading
 
 
 CUR_DIR = os.path.dirname(os.path.abspath(__file__))
@@ -142,11 +143,19 @@ def save_pdf_from_binary(pdf_binary, file_path):
     with open(file_path, 'wb') as file:
         file.write(pdf_binary)
 
+request_lock = threading.Lock()
 
 @app.route('/prints/', methods=['POST', 'OPTIONS'])
 def str_printer():
     if request.method == 'OPTIONS':  # 跨域请求预检
         return jsonify({"message": "OK"}), 200
+    if not request_lock.acquire(timeout=30):
+            logger.warning("打印请求超时，系统繁忙")
+            return jsonify({
+                "err_msg": "系统繁忙，请稍后再试",
+                "err_code": "system_busy"
+            }), 503
+    try:
         print_commands = request.json.get('printer_commands', None)
         print_name = request.json.get('printer_name', None)
         tsclibrary = ctypes.WinDLL(".//TSCLIB.dll")
@@ -179,6 +188,8 @@ def str_printer():
             return jsonify({"err_msg": "打印失败", "err_code": "print_failed"}), 500
         
         return jsonify({}), 200
+    finally:
+        request_lock.release()
 
 
 if __name__ == '__main__':