| # Copyright 2015-2016, 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 |
| |
| import six |
| |
| # face_interfaces is referenced from specification in this module. |
| from grpc.framework.common import cardinality |
| from grpc.framework.face import interfaces as face_interfaces # pylint: disable=unused-import |
| from grpc.framework.face import utilities as face_utilities |
| from grpc.framework.alpha import _reexport |
| from grpc.framework.alpha import interfaces |
| |
| |
| def _qualified_name(service_name, method_name): |
| return '/%s/%s' % (service_name, method_name) |
| |
| |
| # TODO(nathaniel): This structure is getting bloated; it could be shrunk if |
| # implementations._Stub used a generic rather than a dynamic underlying |
| # face-layer stub. |
| class InvocationBreakdown(object): |
| """An intermediate representation of invocation-side views of RPC methods. |
| |
| Attributes: |
| cardinalities: A dictionary from RPC method name to interfaces.Cardinality |
| value. |
| qualified_names: A dictionary from unqualified RPC method name to |
| service-qualified RPC method name. |
| face_cardinalities: A dictionary from service-qualified RPC method name to |
| to cardinality.Cardinality value. |
| request_serializers: A dictionary from service-qualified RPC method name to |
| callable behavior to be used serializing request values for the RPC. |
| response_deserializers: A dictionary from service-qualified RPC method name |
| to callable behavior to be used deserializing response values for the |
| RPC. |
| """ |
| __metaclass__ = abc.ABCMeta |
| |
| |
| class _EasyInvocationBreakdown( |
| InvocationBreakdown, |
| collections.namedtuple( |
| '_EasyInvocationBreakdown', |
| ('cardinalities', 'qualified_names', 'face_cardinalities', |
| 'request_serializers', 'response_deserializers'))): |
| pass |
| |
| |
| class ServiceBreakdown(object): |
| """An intermediate representation of service-side views of RPC methods. |
| |
| Attributes: |
| implementations: A dictionary from service-qualified RPC method name to |
| face_interfaces.MethodImplementation implementing the RPC method. |
| request_deserializers: A dictionary from service-qualified RPC method name |
| to callable behavior to be used deserializing request values for the RPC. |
| response_serializers: A dictionary from service-qualified RPC method name |
| to callable behavior to be used serializing response values for the RPC. |
| """ |
| __metaclass__ = abc.ABCMeta |
| |
| |
| class _EasyServiceBreakdown( |
| ServiceBreakdown, |
| collections.namedtuple( |
| '_EasyServiceBreakdown', |
| ('implementations', 'request_deserializers', 'response_serializers'))): |
| pass |
| |
| |
| def break_down_invocation(service_name, method_descriptions): |
| """Derives an InvocationBreakdown from several RPC method descriptions. |
| |
| Args: |
| service_name: The package-qualified full name of the service. |
| method_descriptions: A dictionary from RPC method name to |
| interfaces.RpcMethodInvocationDescription describing the RPCs. |
| |
| Returns: |
| An InvocationBreakdown corresponding to the given method descriptions. |
| """ |
| cardinalities = {} |
| qualified_names = {} |
| face_cardinalities = {} |
| request_serializers = {} |
| response_deserializers = {} |
| for name, method_description in six.iteritems(method_descriptions): |
| qualified_name = _qualified_name(service_name, name) |
| method_cardinality = method_description.cardinality() |
| cardinalities[name] = method_description.cardinality() |
| qualified_names[name] = qualified_name |
| face_cardinalities[qualified_name] = _reexport.common_cardinality( |
| method_cardinality) |
| request_serializers[qualified_name] = method_description.serialize_request |
| response_deserializers[qualified_name] = ( |
| method_description.deserialize_response) |
| return _EasyInvocationBreakdown( |
| cardinalities, qualified_names, face_cardinalities, request_serializers, |
| response_deserializers) |
| |
| |
| def break_down_service(service_name, method_descriptions): |
| """Derives a ServiceBreakdown from several RPC method descriptions. |
| |
| Args: |
| method_descriptions: A dictionary from RPC method name to |
| interfaces.RpcMethodServiceDescription describing the RPCs. |
| |
| Returns: |
| A ServiceBreakdown corresponding to the given method descriptions. |
| """ |
| implementations = {} |
| request_deserializers = {} |
| response_serializers = {} |
| for name, method_description in six.iteritems(method_descriptions): |
| qualified_name = _qualified_name(service_name, name) |
| method_cardinality = method_description.cardinality() |
| if method_cardinality is interfaces.Cardinality.UNARY_UNARY: |
| def service( |
| request, face_rpc_context, |
| service_behavior=method_description.service_unary_unary): |
| return service_behavior( |
| request, _reexport.rpc_context(face_rpc_context)) |
| implementations[qualified_name] = face_utilities.unary_unary_inline( |
| service) |
| elif method_cardinality is interfaces.Cardinality.UNARY_STREAM: |
| def service( |
| request, face_rpc_context, |
| service_behavior=method_description.service_unary_stream): |
| return service_behavior( |
| request, _reexport.rpc_context(face_rpc_context)) |
| implementations[qualified_name] = face_utilities.unary_stream_inline( |
| service) |
| elif method_cardinality is interfaces.Cardinality.STREAM_UNARY: |
| def service( |
| request_iterator, face_rpc_context, |
| service_behavior=method_description.service_stream_unary): |
| return service_behavior( |
| request_iterator, _reexport.rpc_context(face_rpc_context)) |
| implementations[qualified_name] = face_utilities.stream_unary_inline( |
| service) |
| elif method_cardinality is interfaces.Cardinality.STREAM_STREAM: |
| def service( |
| request_iterator, face_rpc_context, |
| service_behavior=method_description.service_stream_stream): |
| return service_behavior( |
| request_iterator, _reexport.rpc_context(face_rpc_context)) |
| implementations[qualified_name] = face_utilities.stream_stream_inline( |
| service) |
| request_deserializers[qualified_name] = ( |
| method_description.deserialize_request) |
| response_serializers[qualified_name] = ( |
| method_description.serialize_response) |
| |
| return _EasyServiceBreakdown( |
| implementations, request_deserializers, response_serializers) |