| # Copyright 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 |
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| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| """Reference implementation for reflection in gRPC Python.""" |
| |
| import threading |
| |
| import grpc |
| from google.protobuf import descriptor_pb2 |
| from google.protobuf import descriptor_pool |
| |
| from grpc_reflection.v1alpha import reflection_pb2 |
| from grpc_reflection.v1alpha import reflection_pb2_grpc |
| |
| _POOL = descriptor_pool.Default() |
| |
| |
| def _not_found_error(): |
| return reflection_pb2.ServerReflectionResponse( |
| error_response=reflection_pb2.ErrorResponse( |
| error_code=grpc.StatusCode.NOT_FOUND.value[0], |
| error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),)) |
| |
| |
| def _file_descriptor_response(descriptor): |
| proto = descriptor_pb2.FileDescriptorProto() |
| descriptor.CopyToProto(proto) |
| serialized_proto = proto.SerializeToString() |
| return reflection_pb2.ServerReflectionResponse( |
| file_descriptor_response=reflection_pb2.FileDescriptorResponse( |
| file_descriptor_proto=(serialized_proto,)),) |
| |
| |
| class ReflectionServicer(reflection_pb2_grpc.ServerReflectionServicer): |
| """Servicer handling RPCs for service statuses.""" |
| |
| def __init__(self, service_names, pool=None): |
| """Constructor. |
| |
| Args: |
| service_names: Iterable of fully-qualified service names available. |
| """ |
| self._service_names = tuple(sorted(service_names)) |
| self._pool = _POOL if pool is None else pool |
| |
| def _file_by_filename(self, filename): |
| try: |
| descriptor = self._pool.FindFileByName(filename) |
| except KeyError: |
| return _not_found_error() |
| else: |
| return _file_descriptor_response(descriptor) |
| |
| def _file_containing_symbol(self, fully_qualified_name): |
| try: |
| descriptor = self._pool.FindFileContainingSymbol( |
| fully_qualified_name) |
| except KeyError: |
| return _not_found_error() |
| else: |
| return _file_descriptor_response(descriptor) |
| |
| def _file_containing_extension(self, containing_type, extension_number): |
| try: |
| message_descriptor = self._pool.FindMessageTypeByName(containing_type) |
| extension_descriptor = self._pool.FindExtensionByNumber( |
| message_descriptor, extension_number) |
| descriptor = self._pool.FindFileContainingSymbol( |
| extension_descriptor.full_name) |
| except KeyError: |
| return _not_found_error() |
| else: |
| return _file_descriptor_response(descriptor) |
| |
| def _all_extension_numbers_of_type(self, containing_type): |
| try: |
| message_descriptor = self._pool.FindMessageTypeByName(containing_type) |
| extension_numbers = tuple(sorted( |
| extension.number |
| for extension in self._pool.FindAllExtensions(message_descriptor))) |
| except KeyError: |
| return _not_found_error() |
| else: |
| return reflection_pb2.ServerReflectionResponse( |
| all_extension_numbers_response=reflection_pb2. |
| ExtensionNumberResponse( |
| base_type_name=message_descriptor.full_name, |
| extension_number=extension_numbers)) |
| |
| def _list_services(self): |
| return reflection_pb2.ServerReflectionResponse( |
| list_services_response=reflection_pb2.ListServiceResponse(service=[ |
| reflection_pb2.ServiceResponse(name=service_name) |
| for service_name in self._service_names |
| ])) |
| |
| def ServerReflectionInfo(self, request_iterator, context): |
| for request in request_iterator: |
| if request.HasField('file_by_filename'): |
| yield self._file_by_filename(request.file_by_filename) |
| elif request.HasField('file_containing_symbol'): |
| yield self._file_containing_symbol( |
| request.file_containing_symbol) |
| elif request.HasField('file_containing_extension'): |
| yield self._file_containing_extension( |
| request.file_containing_extension.containing_type, |
| request.file_containing_extension.extension_number) |
| elif request.HasField('all_extension_numbers_of_type'): |
| yield self._all_extension_numbers_of_type( |
| request.all_extension_numbers_of_type) |
| elif request.HasField('list_services'): |
| yield self._list_services() |
| else: |
| yield reflection_pb2.ServerReflectionResponse( |
| error_response=reflection_pb2.ErrorResponse( |
| error_code=grpc.StatusCode.INVALID_ARGUMENT.value[0], |
| error_message=grpc.StatusCode.INVALID_ARGUMENT.value[1] |
| .encode(),)) |
| |
| |
| def enable_server_reflection(service_names, server, pool=None): |
| """Enables server reflection on a server. |
| |
| Args: |
| service_names: Iterable of fully-qualified service names available. |
| server: grpc.Server to which reflection service will be added. |
| pool: DescriptorPool object to use (descriptor_pool.Default() if None). |
| """ |
| reflection_pb2_grpc.add_ServerReflectionServicer_to_server( |
| ReflectionServicer(service_names), server, pool) |