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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.
import abc
import collections
from grpc.framework.face import interfaces as face_interfaces
from grpc.early_adopter import interfaces
class _InlineUnaryUnaryMethod(face_interfaces.InlineValueInValueOutMethod):
def __init__(self, unary_unary_rpc_method):
self._method = unary_unary_rpc_method
def service(self, request, context):
"""See face_interfaces.InlineValueInValueOutMethod.service for spec."""
return self._method.service_unary_unary(request)
class _InlineUnaryStreamMethod(face_interfaces.InlineValueInStreamOutMethod):
def __init__(self, unary_stream_rpc_method):
self._method = unary_stream_rpc_method
def service(self, request, context):
"""See face_interfaces.InlineValueInStreamOutMethod.service for spec."""
return self._method.service_unary_stream(request)
class _InlineStreamUnaryMethod(face_interfaces.InlineStreamInValueOutMethod):
def __init__(self, stream_unary_rpc_method):
self._method = stream_unary_rpc_method
def service(self, request_iterator, context):
"""See face_interfaces.InlineStreamInValueOutMethod.service for spec."""
return self._method.service_stream_unary(request_iterator)
class _InlineStreamStreamMethod(face_interfaces.InlineStreamInStreamOutMethod):
def __init__(self, stream_stream_rpc_method):
self._method = stream_stream_rpc_method
def service(self, request_iterator, context):
"""See face_interfaces.InlineStreamInStreamOutMethod.service for spec."""
return self._method.service_stream_stream(request_iterator)
class Breakdown(object):
"""An intermediate representation of implementations of RPC methods.
Attributes:
unary_unary_methods:
unary_stream_methods:
stream_unary_methods:
stream_stream_methods:
request_serializers:
request_deserializers:
response_serializers:
response_deserializers:
"""
__metaclass__ = abc.ABCMeta
class _EasyBreakdown(
Breakdown,
collections.namedtuple(
'_EasyBreakdown',
['unary_unary_methods', 'unary_stream_methods', 'stream_unary_methods',
'stream_stream_methods', 'request_serializers',
'request_deserializers', 'response_serializers',
'response_deserializers'])):
pass
def break_down(methods):
"""Breaks down RPC methods.
Args:
methods: A dictionary from RPC mthod name to
interfaces.RpcMethod object describing the RPCs.
Returns:
A Breakdown corresponding to the given methods.
"""
unary_unary = {}
unary_stream = {}
stream_unary = {}
stream_stream = {}
request_serializers = {}
request_deserializers = {}
response_serializers = {}
response_deserializers = {}
for name, method in methods.iteritems():
cardinality = method.cardinality()
if cardinality is interfaces.Cardinality.UNARY_UNARY:
unary_unary[name] = _InlineUnaryUnaryMethod(method)
elif cardinality is interfaces.Cardinality.UNARY_STREAM:
unary_stream[name] = _InlineUnaryStreamMethod(method)
elif cardinality is interfaces.Cardinality.STREAM_UNARY:
stream_unary[name] = _InlineStreamUnaryMethod(method)
elif cardinality is interfaces.Cardinality.STREAM_STREAM:
stream_stream[name] = _InlineStreamStreamMethod(method)
request_serializers[name] = method.serialize_request
request_deserializers[name] = method.deserialize_request
response_serializers[name] = method.serialize_response
response_deserializers[name] = method.deserialize_response
return _EasyBreakdown(
unary_unary, unary_stream, stream_unary, stream_stream,
request_serializers, request_deserializers, response_serializers,
response_deserializers)
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