Added delete option to database storage.

venv/Lib/site-packages/grpc/framework/interfaces/base/utilities.py

@@ -0,0 +1,71 @@
+# 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.
+"""Utilities for use with the base interface of RPC Framework."""
+
+import collections
+
+from grpc.framework.interfaces.base import base
+
+
+class _Completion(base.Completion,
+                  collections.namedtuple('_Completion', (
+                      'terminal_metadata',
+                      'code',
+                      'message',
+                  ))):
+    """A trivial implementation of base.Completion."""
+
+
+class _Subscription(base.Subscription,
+                    collections.namedtuple('_Subscription', (
+                        'kind',
+                        'termination_callback',
+                        'allowance',
+                        'operator',
+                        'protocol_receiver',
+                    ))):
+    """A trivial implementation of base.Subscription."""
+
+
+_NONE_SUBSCRIPTION = _Subscription(base.Subscription.Kind.NONE, None, None,
+                                   None, None)
+
+
+def completion(terminal_metadata, code, message):
+    """Creates a base.Completion aggregating the given operation values.
+
+  Args:
+    terminal_metadata: A terminal metadata value for an operaton.
+    code: A code value for an operation.
+    message: A message value for an operation.
+
+  Returns:
+    A base.Completion aggregating the given operation values.
+  """
+    return _Completion(terminal_metadata, code, message)
+
+
+def full_subscription(operator, protocol_receiver):
+    """Creates a "full" base.Subscription for the given base.Operator.
+
+  Args:
+    operator: A base.Operator to be used in an operation.
+    protocol_receiver: A base.ProtocolReceiver to be used in an operation.
+
+  Returns:
+    A base.Subscription of kind base.Subscription.Kind.FULL wrapping the given
+      base.Operator and base.ProtocolReceiver.
+  """
+    return _Subscription(base.Subscription.Kind.FULL, None, None, operator,
+                         protocol_receiver)