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+# 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 GRPC."""
+
+from grpc.framework.alpha import interfaces
+
+
+class _RpcMethodDescription(
+    interfaces.RpcMethodInvocationDescription,
+    interfaces.RpcMethodServiceDescription):
+
+  def __init__(
+      self, cardinality, unary_unary, unary_stream, stream_unary,
+      stream_stream, request_serializer, request_deserializer,
+      response_serializer, response_deserializer):
+    self._cardinality = cardinality
+    self._unary_unary = unary_unary
+    self._unary_stream = unary_stream
+    self._stream_unary = stream_unary
+    self._stream_stream = stream_stream
+    self._request_serializer = request_serializer
+    self._request_deserializer = request_deserializer
+    self._response_serializer = response_serializer
+    self._response_deserializer = response_deserializer
+
+  def cardinality(self):
+    """See interfaces.RpcMethodDescription.cardinality for specification."""
+    return self._cardinality
+
+  def serialize_request(self, request):
+    """See interfaces.RpcMethodInvocationDescription.serialize_request."""
+    return self._request_serializer(request)
+
+  def deserialize_request(self, serialized_request):
+    """See interfaces.RpcMethodServiceDescription.deserialize_request."""
+    return self._request_deserializer(serialized_request)
+
+  def serialize_response(self, response):
+    """See interfaces.RpcMethodServiceDescription.serialize_response."""
+    return self._response_serializer(response)
+
+  def deserialize_response(self, serialized_response):
+    """See interfaces.RpcMethodInvocationDescription.deserialize_response."""
+    return self._response_deserializer(serialized_response)
+
+  def service_unary_unary(self, request, context):
+    """See interfaces.RpcMethodServiceDescription.service_unary_unary."""
+    return self._unary_unary(request, context)
+
+  def service_unary_stream(self, request, context):
+    """See interfaces.RpcMethodServiceDescription.service_unary_stream."""
+    return self._unary_stream(request, context)
+
+  def service_stream_unary(self, request_iterator, context):
+    """See interfaces.RpcMethodServiceDescription.service_stream_unary."""
+    return self._stream_unary(request_iterator, context)
+
+  def service_stream_stream(self, request_iterator, context):
+    """See interfaces.RpcMethodServiceDescription.service_stream_stream."""
+    return self._stream_stream(request_iterator, context)
+
+
+def unary_unary_invocation_description(
+    request_serializer, response_deserializer):
+  """Creates an interfaces.RpcMethodInvocationDescription for an RPC method.
+
+  Args:
+    request_serializer: A callable that when called on a request
+      value returns a bytestring corresponding to that value.
+    response_deserializer: A callable that when called on a
+      bytestring returns the response value corresponding to
+      that bytestring.
+
+  Returns:
+    An interfaces.RpcMethodInvocationDescription constructed from the given
+      arguments representing a unary-request/unary-response RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.UNARY_UNARY, None, None, None, None,
+      request_serializer, None, None, response_deserializer)
+
+
+def unary_stream_invocation_description(
+    request_serializer, response_deserializer):
+  """Creates an interfaces.RpcMethodInvocationDescription for an RPC method.
+
+  Args:
+    request_serializer: A callable that when called on a request
+      value returns a bytestring corresponding to that value.
+    response_deserializer: A callable that when called on a
+      bytestring returns the response value corresponding to
+      that bytestring.
+
+  Returns:
+    An interfaces.RpcMethodInvocationDescription constructed from the given
+      arguments representing a unary-request/streaming-response RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.UNARY_STREAM, None, None, None, None,
+      request_serializer, None, None, response_deserializer)
+
+
+def stream_unary_invocation_description(
+    request_serializer, response_deserializer):
+  """Creates an interfaces.RpcMethodInvocationDescription for an RPC method.
+
+  Args:
+    request_serializer: A callable that when called on a request
+      value returns a bytestring corresponding to that value.
+    response_deserializer: A callable that when called on a
+      bytestring returns the response value corresponding to
+      that bytestring.
+
+  Returns:
+    An interfaces.RpcMethodInvocationDescription constructed from the given
+      arguments representing a streaming-request/unary-response RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.STREAM_UNARY, None, None, None, None,
+      request_serializer, None, None, response_deserializer)
+
+
+def stream_stream_invocation_description(
+    request_serializer, response_deserializer):
+  """Creates an interfaces.RpcMethodInvocationDescription for an RPC method.
+
+  Args:
+    request_serializer: A callable that when called on a request
+      value returns a bytestring corresponding to that value.
+    response_deserializer: A callable that when called on a
+      bytestring returns the response value corresponding to
+      that bytestring.
+
+  Returns:
+    An interfaces.RpcMethodInvocationDescription constructed from the given
+      arguments representing a  streaming-request/streaming-response RPC
+      method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.STREAM_STREAM, None, None, None, None,
+      request_serializer, None, None, response_deserializer)
+
+
+def unary_unary_service_description(
+    behavior, request_deserializer, response_serializer):
+  """Creates an interfaces.RpcMethodServiceDescription for the given behavior.
+
+  Args:
+    behavior: A callable that implements a unary-unary RPC
+      method that accepts a single request and an interfaces.RpcContext and
+      returns a single response.
+    request_deserializer: A callable that when called on a
+      bytestring returns the request value corresponding to that
+      bytestring.
+    response_serializer: A callable that when called on a
+      response value returns the bytestring corresponding to
+      that value.
+
+  Returns:
+    An interfaces.RpcMethodServiceDescription constructed from the given
+      arguments representing a unary-request/unary-response RPC
+      method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.UNARY_UNARY, behavior, None, None, None,
+      None, request_deserializer, response_serializer, None)
+
+
+def unary_stream_service_description(
+    behavior, request_deserializer, response_serializer):
+  """Creates an interfaces.RpcMethodServiceDescription for the given behavior.
+
+  Args:
+    behavior: A callable that implements a unary-stream RPC
+      method that accepts a single request and an interfaces.RpcContext
+      and returns an iterator of zero or more responses.
+    request_deserializer: A callable that when called on a
+      bytestring returns the request value corresponding to that
+      bytestring.
+    response_serializer: A callable that when called on a
+      response value returns the bytestring corresponding to
+      that value.
+
+  Returns:
+    An interfaces.RpcMethodServiceDescription constructed from the given
+      arguments representing a unary-request/streaming-response
+      RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.UNARY_STREAM, None, behavior, None, None,
+      None, request_deserializer, response_serializer, None)
+
+
+def stream_unary_service_description(
+    behavior, request_deserializer, response_serializer):
+  """Creates an interfaces.RpcMethodServiceDescription for the given behavior.
+
+  Args:
+    behavior: A callable that implements a stream-unary RPC
+      method that accepts an iterator of zero or more requests
+      and an interfaces.RpcContext and returns a single response.
+    request_deserializer: A callable that when called on a
+      bytestring returns the request value corresponding to that
+      bytestring.
+    response_serializer: A callable that when called on a
+      response value returns the bytestring corresponding to
+      that value.
+
+  Returns:
+    An interfaces.RpcMethodServiceDescription constructed from the given
+      arguments representing a streaming-request/unary-response
+      RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.STREAM_UNARY, None, None, behavior, None,
+      None, request_deserializer, response_serializer, None)
+
+
+def stream_stream_service_description(
+    behavior, request_deserializer, response_serializer):
+  """Creates an interfaces.RpcMethodServiceDescription for the given behavior.
+
+  Args:
+    behavior: A callable that implements a stream-stream RPC
+      method that accepts an iterator of zero or more requests
+      and an interfaces.RpcContext and returns an iterator of
+      zero or more responses.
+    request_deserializer: A callable that when called on a
+      bytestring returns the request value corresponding to that
+      bytestring.
+    response_serializer: A callable that when called on a
+      response value returns the bytestring corresponding to
+      that value.
+
+  Returns:
+    An interfaces.RpcMethodServiceDescription constructed from the given
+      arguments representing a
+      streaming-request/streaming-response RPC method.
+  """
+  return _RpcMethodDescription(
+      interfaces.Cardinality.STREAM_STREAM, None, None, None, behavior,
+      None, request_deserializer, response_serializer, None)