Add grpcio-status extension package

* The new package has 2 API `from_call` and `to_status`
* Utilize the experimental API `abort_with_status`
* Add 5 unit test cases

5 files changed, 209 insertions, 0 deletions

diff --git a/src/python/grpcio_tests/setup.py b/src/python/grpcio_tests/setup.py
index f56425ac6d..f9cb9d0cec 100644
--- a/src/python/grpcio_tests/setup.py
+++ b/src/python/grpcio_tests/setup.py
@@ -40,6 +40,7 @@ INSTALL_REQUIRES = (
     'coverage>=4.0', 'enum34>=1.0.4',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
     'grpcio-channelz>={version}'.format(version=grpc_version.VERSION),
+    'grpcio-status>={version}'.format(version=grpc_version.VERSION),
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),
     'grpcio-health-checking>={version}'.format(version=grpc_version.VERSION),
     'oauth2client>=1.4.7', 'protobuf>=3.6.0', 'six>=1.10', 'google-auth>=1.0.0',
diff --git a/src/python/grpcio_tests/tests/status/BUILD.bazel b/src/python/grpcio_tests/tests/status/BUILD.bazel
new file mode 100644
index 0000000000..937e50498e
--- /dev/null
+++ b/src/python/grpcio_tests/tests/status/BUILD.bazel
@@ -0,0 +1,19 @@
+load("@grpc_python_dependencies//:requirements.bzl", "requirement")
+
+package(default_visibility = ["//visibility:public"])
+
+py_test(
+    name = "grpc_status_test",
+    srcs = ["_grpc_status_test.py"],
+    main = "_grpc_status_test.py",
+    size = "small",
+    deps = [
+        "//src/python/grpcio/grpc:grpcio",
+        "//src/python/grpcio_status/grpc_status:grpc_status",
+        "//src/python/grpcio_tests/tests/unit:test_common",
+        "//src/python/grpcio_tests/tests/unit/framework/common:common",
+        requirement('protobuf'),
+        requirement('googleapis-common-protos'),
+    ],
+    imports = ["../../",],
+)
diff --git a/src/python/grpcio_tests/tests/status/__init__.py b/src/python/grpcio_tests/tests/status/__init__.py
new file mode 100644
index 0000000000..38fdfc9c5c
--- /dev/null
+++ b/src/python/grpcio_tests/tests/status/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2018 The 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.
diff --git a/src/python/grpcio_tests/tests/status/_grpc_status_test.py b/src/python/grpcio_tests/tests/status/_grpc_status_test.py
new file mode 100644
index 0000000000..5969338736
--- /dev/null
+++ b/src/python/grpcio_tests/tests/status/_grpc_status_test.py
@@ -0,0 +1,175 @@
+# Copyright 2018 The 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_status."""
+
+import unittest
+
+import logging
+import traceback
+
+import grpc
+from grpc_status import rpc_status
+
+from tests.unit import test_common
+
+from google.protobuf import any_pb2
+from google.rpc import code_pb2, status_pb2, error_details_pb2
+
+_STATUS_OK = '/test/StatusOK'
+_STATUS_NOT_OK = '/test/StatusNotOk'
+_ERROR_DETAILS = '/test/ErrorDetails'
+_INCONSISTENT = '/test/Inconsistent'
+_INVALID_CODE = '/test/InvalidCode'
+
+_REQUEST = b'\x00\x00\x00'
+_RESPONSE = b'\x01\x01\x01'
+
+_GRPC_DETAILS_METADATA_KEY = 'grpc-status-details-bin'
+
+_STATUS_DETAILS = 'This is an error detail'
+_STATUS_DETAILS_ANOTHER = 'This is another error detail'
+
+
+def _ok_unary_unary(request, servicer_context):
+    return _RESPONSE
+
+
+def _not_ok_unary_unary(request, servicer_context):
+    servicer_context.abort(grpc.StatusCode.INTERNAL, _STATUS_DETAILS)
+
+
+def _error_details_unary_unary(request, servicer_context):
+    details = any_pb2.Any()
+    details.Pack(
+        error_details_pb2.DebugInfo(
+            stack_entries=traceback.format_stack(),
+            detail='Intensionally invoked'))
+    rich_status = status_pb2.Status(
+        code=code_pb2.INTERNAL,
+        message=_STATUS_DETAILS,
+        details=[details],
+    )
+    servicer_context.abort_with_status(rpc_status.to_status(rich_status))
+
+
+def _inconsistent_unary_unary(request, servicer_context):
+    rich_status = status_pb2.Status(
+        code=code_pb2.INTERNAL,
+        message=_STATUS_DETAILS,
+    )
+    servicer_context.set_code(grpc.StatusCode.NOT_FOUND)
+    servicer_context.set_details(_STATUS_DETAILS_ANOTHER)
+    # User put inconsistent status information in trailing metadata
+    servicer_context.set_trailing_metadata(((_GRPC_DETAILS_METADATA_KEY,
+                                             rich_status.SerializeToString()),))
+
+
+def _invalid_code_unary_unary(request, servicer_context):
+    rich_status = status_pb2.Status(
+        code=42,
+        message='Invalid code',
+    )
+    servicer_context.abort_with_status(rpc_status.to_status(rich_status))
+
+
+class _GenericHandler(grpc.GenericRpcHandler):
+
+    def service(self, handler_call_details):
+        if handler_call_details.method == _STATUS_OK:
+            return grpc.unary_unary_rpc_method_handler(_ok_unary_unary)
+        elif handler_call_details.method == _STATUS_NOT_OK:
+            return grpc.unary_unary_rpc_method_handler(_not_ok_unary_unary)
+        elif handler_call_details.method == _ERROR_DETAILS:
+            return grpc.unary_unary_rpc_method_handler(
+                _error_details_unary_unary)
+        elif handler_call_details.method == _INCONSISTENT:
+            return grpc.unary_unary_rpc_method_handler(
+                _inconsistent_unary_unary)
+        elif handler_call_details.method == _INVALID_CODE:
+            return grpc.unary_unary_rpc_method_handler(
+                _invalid_code_unary_unary)
+        else:
+            return None
+
+
+class StatusTest(unittest.TestCase):
+
+    def setUp(self):
+        self._server = test_common.test_server()
+        self._server.add_generic_rpc_handlers((_GenericHandler(),))
+        port = self._server.add_insecure_port('[::]:0')
+        self._server.start()
+
+        self._channel = grpc.insecure_channel('localhost:%d' % port)
+
+    def tearDown(self):
+        self._server.stop(None)
+        self._channel.close()
+
+    def test_status_ok(self):
+        try:
+            _, call = self._channel.unary_unary(_STATUS_OK).with_call(_REQUEST)
+        except grpc.RpcError as rpc_error:
+            self.fail(rpc_error)
+        # Succeed RPC doesn't have status
+        status = rpc_status.from_call(call)
+        self.assertIs(status, None)
+
+    def test_status_not_ok(self):
+        with self.assertRaises(grpc.RpcError) as exception_context:
+            self._channel.unary_unary(_STATUS_NOT_OK).with_call(_REQUEST)
+        rpc_error = exception_context.exception
+
+        self.assertEqual(rpc_error.code(), grpc.StatusCode.INTERNAL)
+        # Failed RPC doesn't automatically generate status
+        status = rpc_status.from_call(rpc_error)
+        self.assertIs(status, None)
+
+    def test_error_details(self):
+        with self.assertRaises(grpc.RpcError) as exception_context:
+            self._channel.unary_unary(_ERROR_DETAILS).with_call(_REQUEST)
+        rpc_error = exception_context.exception
+
+        status = rpc_status.from_call(rpc_error)
+        self.assertEqual(rpc_error.code(), grpc.StatusCode.INTERNAL)
+        self.assertEqual(status.code, code_pb2.Code.Value('INTERNAL'))
+
+        # Check if the underlying proto message is intact
+        self.assertEqual(status.details[0].Is(
+            error_details_pb2.DebugInfo.DESCRIPTOR), True)
+        info = error_details_pb2.DebugInfo()
+        status.details[0].Unpack(info)
+        self.assertIn('_error_details_unary_unary', info.stack_entries[-1])
+
+    def test_code_message_validation(self):
+        with self.assertRaises(grpc.RpcError) as exception_context:
+            self._channel.unary_unary(_INCONSISTENT).with_call(_REQUEST)
+        rpc_error = exception_context.exception
+        self.assertEqual(rpc_error.code(), grpc.StatusCode.NOT_FOUND)
+
+        # Code/Message validation failed
+        self.assertRaises(ValueError, rpc_status.from_call, rpc_error)
+
+    def test_invalid_code(self):
+        with self.assertRaises(grpc.RpcError) as exception_context:
+            self._channel.unary_unary(_INVALID_CODE).with_call(_REQUEST)
+        rpc_error = exception_context.exception
+        self.assertEqual(rpc_error.code(), grpc.StatusCode.UNKNOWN)
+        # Invalid status code exception raised during coversion
+        self.assertIn('Invalid status code', rpc_error.details())
+
+
+if __name__ == '__main__':
+    logging.basicConfig()
+    unittest.main(verbosity=2)
diff --git a/src/python/grpcio_tests/tests/tests.json b/src/python/grpcio_tests/tests/tests.json
index 44700e979e..b27e6f2693 100644
--- a/src/python/grpcio_tests/tests/tests.json
+++ b/src/python/grpcio_tests/tests/tests.json
@@ -15,6 +15,7 @@
   "protoc_plugin._split_definitions_test.SplitProtoSingleProtocExecutionProtocStyleTest",
   "protoc_plugin.beta_python_plugin_test.PythonPluginTest",
   "reflection._reflection_servicer_test.ReflectionServicerTest",
+  "status._grpc_status_test.StatusTest",
   "testing._client_test.ClientTest",
   "testing._server_test.FirstServiceServicerTest",
   "testing._time_test.StrictFakeTimeTest",