restrict open application multiple times

.gitignore

@@ -21,7 +21,7 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
-*.log*
+*.log
 
 package-lock*
 

INSTALL

@@ -32,6 +32,8 @@ The following packages must be installed using PIP
 	pip3 install orjson
 	pip3 install escpos
 	pip3 install PySide6
+	pip3 install psutil
+	pip3 install setproctitle
 
 
 For Windows add:

INSTALL_es

@@ -34,6 +34,8 @@ Los siguientes paquetes se deben instalar usando PIP
 	pip3 install orjson
 	pip3 install escpos
 	pip3 install PySide6
+	pip3 install psutil
+	pip3 install setproctitle
 
 
 Tener en cuenta que algunos paquetes se deben instalar con pip para python3.

pospro

@@ -3,10 +3,14 @@
 import os
 import sys
 import argparse
-from PySide6.QtWidgets import QApplication
+import setproctitle
+import psutil
+from PySide6.QtCore import Qt, QCoreApplication
+from PySide6.QtWidgets import QApplication, QMessageBox
 # from PyQt5.QtWidgets import QApplication
 from app.commons.dblogin import Login
 from app import main
+from logger_config import logger
 
 parser = argparse.ArgumentParser(description='Process some integers.')
 parser.add_argument('-o', metavar="theme", help='execute argument')
@@ -20,15 +24,38 @@ try:
 except NameError:
     pass
 
+PROCESS_NAME = "app_presik_pos"
+
+
+class SingleInstanceApp(QApplication):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        for process in psutil.process_iter(['pid', 'name']):
+            if process.info['name'] == PROCESS_NAME:
+                logger.error('La aplicación ya esta en ejecución')
+                self.show_already_running_dialog()
+                sys.exit(1)
+
+    def show_already_running_dialog(self):
+        msg = QMessageBox()
+        msg.setIcon(QMessageBox.Warning)
+        msg.setText("La aplicación ya está en ejecución.")
+        msg.setWindowTitle("Aplicación en ejecución")
+        msg.setStandardButtons(QMessageBox.Ok)
+        msg.exec()
+
 
 class Client(object):
 
     def __init__(self, parent=None):
-        self.app = QApplication(sys.argv)
+        # self.app = QApplication(sys.argv)
+        self.app = SingleInstanceApp(sys.argv)
         self.app.setOrganizationName("PRESIK SAS")
         self.app.setOrganizationDomain("presik.com")
         self.app.setApplicationName("SMART POS")
         self.app.setStyle("fusion")
+        setproctitle.setproctitle(PROCESS_NAME)
 
     def init_login(self):
         _file_config = 'config_pos.ini'

setup.py

@@ -71,6 +71,8 @@ setup(
         'paramiko',
         'orjson',
         'escpos',
-        'PySide6>=6.4.1'
+        'PySide6>=6.4.1',
+        'psutil',
+        'setproctitle'
     ]
 )