Initial checkin of gRPC to third_party/

third_party/grpc/src/python/grpcio/grpc/framework/interfaces/base/utilities.py

Index: third_party/grpc/src/python/grpcio/grpc/framework/interfaces/base/utilities.py
diff --git a/third_party/grpc/src/python/grpcio/grpc/framework/interfaces/base/utilities.py b/third_party/grpc/src/python/grpcio/grpc/framework/interfaces/base/utilities.py
new file mode 100644
index 0000000000000000000000000000000000000000..87a85018f52a4fb46acc38651e9d468b37d75a17
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@@ -0,0 +1,82 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""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)