Transform InterruptHandler to context manager

sw_utils/common.py

@@ -7,16 +7,30 @@
 class InterruptHandler:
     """
     Tracks SIGINT and SIGTERM signals.
+    Usage:
+    with InterruptHandler() as interrupt_handler:
+        while not interrupt_handler.exit:
+        ...
     """
 
     exit = False
 
-    def __init__(self) -> None:
+    def __enter__(self) -> 'InterruptHandler':
         signal.signal(signal.SIGINT, self.exit_gracefully)
         signal.signal(signal.SIGTERM, self.exit_gracefully)
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        signal.signal(signal.SIGINT, self.exit_default)
+        signal.signal(signal.SIGTERM, self.exit_default)
 
-    # noinspection PyUnusedLocal
     def exit_gracefully(self, signum: int, *args, **kwargs) -> None:
         # pylint: disable=unused-argument
+        if self.exit:
+            raise KeyboardInterrupt
         logger.info('Received interrupt signal %s, exiting...', signum)
         self.exit = True
+
+    def exit_default(self, signum: int, *args, **kwargs) -> None:
+        # pylint: disable=unused-argument
+        raise KeyboardInterrupt