Initial commit

[ta/distributed-state-server.git] / src / dss / server / dss_shutdown_handler.py

diff --git a/src/dss/server/dss_shutdown_handler.py b/src/dss/server/dss_shutdown_handler.py
new file mode 100644 (file)
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+++ b/src/dss/server/dss_shutdown_handler.py
@@ -0,0 +1,41 @@
+# Copyright 2019 Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import signal
+import logging
+from dss.api import dss_error
+
+class ShutdownHandlerBase(object):
+    def __init__(self):
+        pass
+
+    def shutdown(self):
+        raise dss_error.Error('Not implemented')
+
+class ShutdownHandler(object):
+    def __init__(self):
+        signal.signal(signal.SIGINT, self.stop)
+        signal.signal(signal.SIGTERM, self.stop)
+        self.handlers = []
+
+    def add_handler(self, handler):
+        logging.info("Added handler %r" % handler)
+        self.handlers.append(handler)
+
+    def stop(self, signum, frame):
+        for handler in self.handlers:
+            logging.info("Calling shutdown on %r" % handler)
+            handler.shutdown()
+            logging.info("shutdown of %r returned" % handler)