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# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Reference implementation for reflection in gRPC Python."""
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):
# pylint: disable=unused-argument
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, pool=pool), server)
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