additional logging and error handling

src/wce_crm/gui.py

@@ -8,6 +8,7 @@ import json
 import pickle
 import re
 import sys
+import traceback
 import uuid
 from collections import defaultdict
 from collections.abc import Container, Iterable, Sequence
@@ -33,7 +34,9 @@ from PySide6.QtCore import (
     QObject,
     Qt,
     QTimer,
+    QtMsgType,
     Signal,
+    qInstallMessageHandler,
 )
 from PySide6.QtGui import QAction
 from PySide6.QtWidgets import (
@@ -1073,11 +1076,11 @@ def set_form_data(
             value = data
         else:
             if key not in data:
-                logger_gui.debug("---- Key not in data: %s")
-                logger_gui.debug("-------- Data: %s", pformat(data))
+                logger_gui.error("Key not in data: %s", key)
+                logger_gui.error("Data:\n%s", pformat(data))
             value = data[key]
 
-        logger_gui.debug("---- Key set: %s", key)
+        logger_gui.debug("Key set: %s", key)
 
         set_widget_value(widget, value)
 
@@ -3634,9 +3637,51 @@ class MainWindow(QMainWindow):
         help_menu.addAction(about_action)
 
 
+# ** global exception handling
+def global_exception_handler(exc_type, exc_value, exc_traceback):
+    """catches all unhandled errors"""
+
+    # format error
+    error_msg = "".join(traceback.format_exception(exc_type, exc_value, exc_traceback))
+    logger_gui.critical(f"UNEXPECTED ERROR:\n{error_msg}")
+
+    # message to user
+    # check if QApplication exists otherwise crashing of crash handler possible)
+    if QApplication.instance():
+        msg_box = QMessageBox()
+        msg_box.setIcon(QMessageBox.Icon.Critical)
+        msg_box.setWindowTitle("Kritischer Fehler")
+        msg_box.setText(
+            "Ein unerwarteter Fehler ist aufgetreten. Die Details wurden protokolliert."
+        )
+        # details for user or screenshots
+        msg_box.setDetailedText(error_msg)
+        msg_box.exec()
+
+    sys.exit(1)
+
+
+def qt_message_handler(mode, context, message):
+    """forwards internal Qt C++ warnings to Python loggers"""
+    if mode == QtMsgType.QtInfoMsg:
+        logger_gui.info(message)
+    elif mode == QtMsgType.QtWarningMsg:
+        logger_gui.warning(message)
+    elif mode == QtMsgType.QtCriticalMsg:
+        logger_gui.error(message)
+    elif mode == QtMsgType.QtFatalMsg:
+        logger_gui.critical(message)
+
+
 if __name__ == "__main__":
-    app = QApplication(sys.argv)
-    app.setStyleSheet(QSS)
-    window = MainWindow()
-    window.show()
-    sys.exit(app.exec())
+    sys.excepthook = global_exception_handler
+    qInstallMessageHandler(qt_message_handler)
+
+    try:
+        app = QApplication(sys.argv)
+        app.setStyleSheet(QSS)
+        window = MainWindow()
+        window.show()
+        sys.exit(app.exec())
+    except Exception as err:
+        logger_gui.critical("Fehler beim Starten der Anwendung:\n%s", str(err), exc_info=True)