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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 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)
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