remove tmp file when closing app with signal sigterm or sigint

logFileModel.py

@@ -42,6 +42,7 @@ class LogFileModel:
 
         with self._lock:
             # TODO handle lines longer than 4096 bytes
+            # TODO abort file open after a few secons: https://docs.python.org/3/library/signal.html#example
             with open(self._file, 'rb') as f:
                 offset = min(byte_offset, self.byte_count())
                 offset = max(0, offset - self.settings.max_line_length())

main.py

@@ -1,5 +1,7 @@
+import logging
 import os
 import re
+import signal
 
 from PyQt6 import QtCore
 from PyQt6.lupdate import lupdate
@@ -15,10 +17,13 @@ from tabs import Tabs
 
 MAX_LINE_LENGTH = 4096
 
+logging.basicConfig(level=logging.INFO)
+log = logging.getLogger("main")
 
 class MainWindow(QMainWindow):
     def __init__(self, *args, **kwargs):
         super(MainWindow, self).__init__(*args, **kwargs)
+
         self.settings = Settings()
         self.setWindowTitle(self.tr("RavenLog"))
         self.setGeometry(0, 0, 640, 480)
@@ -84,6 +89,17 @@ class MainWindow(QMainWindow):
         self.close()
 
 
+def stop_signal(signum, _stackframe):
+    """ Handle terminate signal """
+    try:
+        log.info("Terminate signal received. %s", signum)
+        QtCore.QCoreApplication.quit()
+    except Exception:
+        log.exception("Exception occured while terminating")
+        sys.exit(1)
+    sys.exit(0)
+
+
 if __name__ == "__main__":
     app = QApplication(sys.argv)
 
@@ -91,7 +107,19 @@ if __name__ == "__main__":
     #if translator.load(QLocale("de"), "messages_de.ts"):
     #    app.installTranslator(translator)
 
+    # workaround to make signals work in QT apps.
+    # They do not work out of the box, because the main thread
+    # is running in C++ code once app.exec() is executed
+    # Forcing an empty lambda to be executed periodically gives
+    # control back to python and allows python to react to signals
+    timer = QTimer()
+    timer.timeout.connect(lambda: None)
+    timer.start(500)
+
     window = MainWindow()
     window.show()
 
+    signal.signal(signal.SIGINT, stop_signal)
+    signal.signal(signal.SIGTERM, stop_signal)
+
     app.exec()