Revert "Revert "[Aio] Add AsyncIO support to grpcio-reflection""

src/python/grpcio_reflection/grpc_reflection/v1alpha/BUILD.bazel

@@ -17,7 +17,7 @@ py_grpc_library(
 
 py_library(
     name = "grpc_reflection",
-    srcs = ["reflection.py"],
+    srcs = glob(["*.py"]),
     imports = ["../../"],
     deps = [
         ":reflection_py_pb2",

src/python/grpcio_reflection/grpc_reflection/v1alpha/_async.py

@@ -0,0 +1,57 @@
+# Copyright 2020 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.
+"""The AsyncIO version of the reflection servicer."""
+
+from typing import AsyncIterable
+
+import grpc
+
+from grpc_reflection.v1alpha import reflection_pb2 as _reflection_pb2
+from grpc_reflection.v1alpha._base import BaseReflectionServicer
+
+
+class ReflectionServicer(BaseReflectionServicer):
+    """Servicer handling RPCs for service statuses."""
+
+    async def ServerReflectionInfo(
+            self, request_iterator: AsyncIterable[
+                _reflection_pb2.ServerReflectionRequest], unused_context
+    ) -> AsyncIterable[_reflection_pb2.ServerReflectionResponse]:
+        async 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(),
+                    ))
+
+
+__all__ = [
+    "ReflectionServicer",
+]

src/python/grpcio_reflection/grpc_reflection/v1alpha/_base.py

@@ -0,0 +1,110 @@
+# Copyright 2020 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.
+"""Base implementation of reflection servicer."""
+
+import grpc
+from google.protobuf import descriptor_pb2
+from google.protobuf import descriptor_pool
+
+from grpc_reflection.v1alpha import reflection_pb2 as _reflection_pb2
+from grpc_reflection.v1alpha import reflection_pb2_grpc as _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 BaseReflectionServicer(_reflection_pb2_grpc.ServerReflectionServicer):
+    """Base class for reflection servicer."""
+
+    def __init__(self, service_names, pool=None):
+        """Constructor.
+
+        Args:
+            service_names: Iterable of fully-qualified service names available.
+            pool: An optional DescriptorPool instance.
+        """
+        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
+            ]))
+
+
+__all__ = ['BaseReflectionServicer']

src/python/grpcio_reflection/grpc_reflection/v1alpha/reflection.py

@@ -13,100 +13,21 @@
 # limitations under the License.
 """Reference implementation for reflection in gRPC Python."""
 
+import sys
 import grpc
-from google.protobuf import descriptor_pb2
-from google.protobuf import descriptor_pool
 
 from grpc_reflection.v1alpha import reflection_pb2 as _reflection_pb2
 from grpc_reflection.v1alpha import reflection_pb2_grpc as _reflection_pb2_grpc
 
-_POOL = descriptor_pool.Default()
+from grpc_reflection.v1alpha._base import BaseReflectionServicer
+
 SERVICE_NAME = _reflection_pb2.DESCRIPTOR.services_by_name[
     'ServerReflection'].full_name
 
 
-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):
+class ReflectionServicer(BaseReflectionServicer):
     """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:
@@ -133,13 +54,45 @@ class ReflectionServicer(_reflection_pb2_grpc.ServerReflectionServicer):
                     ))
 
 
-def enable_server_reflection(service_names, server, pool=None):
-    """Enables server reflection on a server.
+_enable_server_reflection_doc = """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)
+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).
+"""
+
+if sys.version_info[0] >= 3 and sys.version_info[1] >= 6:
+    # Exposes AsyncReflectionServicer as public API.
+    from . import _async as aio
+    from grpc.experimental import aio as grpc_aio  # pylint: disable=ungrouped-imports
+
+    def enable_server_reflection(service_names, server, pool=None):
+        if isinstance(server, grpc_aio.Server):
+            _reflection_pb2_grpc.add_ServerReflectionServicer_to_server(
+                aio.ReflectionServicer(service_names, pool=pool), server)
+        else:
+            _reflection_pb2_grpc.add_ServerReflectionServicer_to_server(
+                ReflectionServicer(service_names, pool=pool), server)
+
+    enable_server_reflection.__doc__ = _enable_server_reflection_doc
+
+    __all__ = [
+        "SERVICE_NAME",
+        "ReflectionServicer",
+        "enable_server_reflection",
+        "aio",
+    ]
+else:
+
+    def enable_server_reflection(service_names, server, pool=None):
+        _reflection_pb2_grpc.add_ServerReflectionServicer_to_server(
+            ReflectionServicer(service_names, pool=pool), server)
+
+    enable_server_reflection.__doc__ = _enable_server_reflection_doc
+
+    __all__ = [
+        "SERVICE_NAME",
+        "ReflectionServicer",
+        "enable_server_reflection",
+    ]

src/python/grpcio_tests/tests_aio/reflection/BUILD.bazel

@@ -0,0 +1,30 @@
+# Copyright 2020 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.
+
+package(default_testonly = 1)
+
+py_test(
+    name = "reflection_servicer_test",
+    srcs = ["reflection_servicer_test.py"],
+    imports = ["../../"],
+    python_version = "PY3",
+    deps = [
+        "//src/proto/grpc/testing:empty_py_pb2",
+        "//src/proto/grpc/testing/proto2:empty2_extensions_proto",
+        "//src/proto/grpc/testing/proto2:empty2_proto",
+        "//src/python/grpcio/grpc:grpcio",
+        "//src/python/grpcio_reflection/grpc_reflection/v1alpha:grpc_reflection",
+        "//src/python/grpcio_tests/tests_aio/unit:_test_base",
+    ],
+)

src/python/grpcio_tests/tests_aio/reflection/__init__.py

@@ -0,0 +1,13 @@
+# 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.

src/python/grpcio_tests/tests_aio/reflection/reflection_servicer_test.py

@@ -0,0 +1,193 @@
+# 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.
+"""Tests of grpc_reflection.v1alpha.reflection."""
+
+import logging
+import unittest
+
+import grpc
+from google.protobuf import descriptor_pb2, descriptor_pool
+from grpc.experimental import aio
+
+from grpc_reflection.v1alpha import (reflection, reflection_pb2,
+                                     reflection_pb2_grpc)
+from src.proto.grpc.testing import empty_pb2
+from src.proto.grpc.testing.proto2 import empty2_extensions_pb2
+from tests_aio.unit._test_base import AioTestBase
+
+_EMPTY_PROTO_FILE_NAME = 'src/proto/grpc/testing/empty.proto'
+_EMPTY_PROTO_SYMBOL_NAME = 'grpc.testing.Empty'
+_SERVICE_NAMES = ('Angstrom', 'Bohr', 'Curie', 'Dyson', 'Einstein', 'Feynman',
+                  'Galilei')
+_EMPTY_EXTENSIONS_SYMBOL_NAME = 'grpc.testing.proto2.EmptyWithExtensions'
+_EMPTY_EXTENSIONS_NUMBERS = (
+    124,
+    125,
+    126,
+    127,
+    128,
+)
+
+
+def _file_descriptor_to_proto(descriptor):
+    proto = descriptor_pb2.FileDescriptorProto()
+    descriptor.CopyToProto(proto)
+    return proto.SerializeToString()
+
+
+class ReflectionServicerTest(AioTestBase):
+
+    async def setUp(self):
+        self._server = aio.server()
+        reflection.enable_server_reflection(_SERVICE_NAMES, self._server)
+        port = self._server.add_insecure_port('[::]:0')
+        await self._server.start()
+
+        self._channel = aio.insecure_channel('localhost:%d' % port)
+        self._stub = reflection_pb2_grpc.ServerReflectionStub(self._channel)
+
+    async def tearDown(self):
+        await self._server.stop(None)
+        await self._channel.close()
+
+    async def test_file_by_name(self):
+        requests = (
+            reflection_pb2.ServerReflectionRequest(
+                file_by_filename=_EMPTY_PROTO_FILE_NAME),
+            reflection_pb2.ServerReflectionRequest(
+                file_by_filename='i-donut-exist'),
+        )
+        responses = []
+        async for response in self._stub.ServerReflectionInfo(iter(requests)):
+            responses.append(response)
+        expected_responses = (
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                file_descriptor_response=reflection_pb2.FileDescriptorResponse(
+                    file_descriptor_proto=(
+                        _file_descriptor_to_proto(empty_pb2.DESCRIPTOR),))),
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                error_response=reflection_pb2.ErrorResponse(
+                    error_code=grpc.StatusCode.NOT_FOUND.value[0],
+                    error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
+                )),
+        )
+        self.assertSequenceEqual(expected_responses, responses)
+
+    async def test_file_by_symbol(self):
+        requests = (
+            reflection_pb2.ServerReflectionRequest(
+                file_containing_symbol=_EMPTY_PROTO_SYMBOL_NAME),
+            reflection_pb2.ServerReflectionRequest(
+                file_containing_symbol='i.donut.exist.co.uk.org.net.me.name.foo'
+            ),
+        )
+        responses = []
+        async for response in self._stub.ServerReflectionInfo(iter(requests)):
+            responses.append(response)
+        expected_responses = (
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                file_descriptor_response=reflection_pb2.FileDescriptorResponse(
+                    file_descriptor_proto=(
+                        _file_descriptor_to_proto(empty_pb2.DESCRIPTOR),))),
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                error_response=reflection_pb2.ErrorResponse(
+                    error_code=grpc.StatusCode.NOT_FOUND.value[0],
+                    error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
+                )),
+        )
+        self.assertSequenceEqual(expected_responses, responses)
+
+    async def test_file_containing_extension(self):
+        requests = (
+            reflection_pb2.ServerReflectionRequest(
+                file_containing_extension=reflection_pb2.ExtensionRequest(
+                    containing_type=_EMPTY_EXTENSIONS_SYMBOL_NAME,
+                    extension_number=125,
+                ),),
+            reflection_pb2.ServerReflectionRequest(
+                file_containing_extension=reflection_pb2.ExtensionRequest(
+                    containing_type='i.donut.exist.co.uk.org.net.me.name.foo',
+                    extension_number=55,
+                ),),
+        )
+        responses = []
+        async for response in self._stub.ServerReflectionInfo(iter(requests)):
+            responses.append(response)
+        expected_responses = (
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                file_descriptor_response=reflection_pb2.FileDescriptorResponse(
+                    file_descriptor_proto=(_file_descriptor_to_proto(
+                        empty2_extensions_pb2.DESCRIPTOR),))),
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                error_response=reflection_pb2.ErrorResponse(
+                    error_code=grpc.StatusCode.NOT_FOUND.value[0],
+                    error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
+                )),
+        )
+        self.assertSequenceEqual(expected_responses, responses)
+
+    async def test_extension_numbers_of_type(self):
+        requests = (
+            reflection_pb2.ServerReflectionRequest(
+                all_extension_numbers_of_type=_EMPTY_EXTENSIONS_SYMBOL_NAME),
+            reflection_pb2.ServerReflectionRequest(
+                all_extension_numbers_of_type='i.donut.exist.co.uk.net.name.foo'
+            ),
+        )
+        responses = []
+        async for response in self._stub.ServerReflectionInfo(iter(requests)):
+            responses.append(response)
+        expected_responses = (
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                all_extension_numbers_response=reflection_pb2.
+                ExtensionNumberResponse(
+                    base_type_name=_EMPTY_EXTENSIONS_SYMBOL_NAME,
+                    extension_number=_EMPTY_EXTENSIONS_NUMBERS)),
+            reflection_pb2.ServerReflectionResponse(
+                valid_host='',
+                error_response=reflection_pb2.ErrorResponse(
+                    error_code=grpc.StatusCode.NOT_FOUND.value[0],
+                    error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
+                )),
+        )
+        self.assertSequenceEqual(expected_responses, responses)
+
+    async def test_list_services(self):
+        requests = (reflection_pb2.ServerReflectionRequest(list_services='',),)
+        responses = []
+        async for response in self._stub.ServerReflectionInfo(iter(requests)):
+            responses.append(response)
+        expected_responses = (reflection_pb2.ServerReflectionResponse(
+            valid_host='',
+            list_services_response=reflection_pb2.ListServiceResponse(
+                service=tuple(
+                    reflection_pb2.ServiceResponse(name=name)
+                    for name in _SERVICE_NAMES))),)
+        self.assertSequenceEqual(expected_responses, responses)
+
+    def test_reflection_service_name(self):
+        self.assertEqual(reflection.SERVICE_NAME,
+                         'grpc.reflection.v1alpha.ServerReflection')
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.DEBUG)
+    unittest.main(verbosity=2)

src/python/grpcio_tests/tests_aio/tests.json

@@ -3,6 +3,7 @@
   "health_check.health_servicer_test.HealthServicerTest",
   "interop.local_interop_test.InsecureLocalInteropTest",
   "interop.local_interop_test.SecureLocalInteropTest",
+  "reflection.reflection_servicer_test.ReflectionServicerTest",
   "unit._metadata_test.TestTypeMetadata",
   "unit.abort_test.TestAbort",
   "unit.aio_rpc_error_test.TestAioRpcError",