Added delete option to database storage.

venv/Lib/site-packages/grpc/framework/foundation/stream.py

@@ -0,0 +1,45 @@
+# Copyright 2015 gRPC authors.
+#
+# 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.
+"""Interfaces related to streams of values or objects."""
+
+import abc
+
+import six
+
+
+class Consumer(six.with_metaclass(abc.ABCMeta)):
+    """Interface for consumers of finite streams of values or objects."""
+
+    @abc.abstractmethod
+    def consume(self, value):
+        """Accepts a value.
+
+    Args:
+      value: Any value accepted by this Consumer.
+    """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def terminate(self):
+        """Indicates to this Consumer that no more values will be supplied."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def consume_and_terminate(self, value):
+        """Supplies a value and signals that no more values will be supplied.
+
+    Args:
+      value: Any value accepted by this Consumer.
+    """
+        raise NotImplementedError()