# Copyright 2015 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.

import collections
import contextlib
import distutils.spawn
import errno
import os
import shutil
import subprocess
import sys
import tempfile
import threading
import unittest

from six import moves

import grpc
import grpc.experimental
from tests.unit import test_common
from tests.unit.framework.common import test_constants

import tests.protoc_plugin.protos.payload.test_payload_pb2 as payload_pb2
import tests.protoc_plugin.protos.requests.r.test_requests_pb2 as request_pb2
import tests.protoc_plugin.protos.responses.test_responses_pb2 as response_pb2
import tests.protoc_plugin.protos.service.test_service_pb2_grpc as service_pb2_grpc

# Identifiers of entities we expect to find in the generated module.
STUB_IDENTIFIER = 'TestServiceStub'
SERVICER_IDENTIFIER = 'TestServiceServicer'
ADD_SERVICER_TO_SERVER_IDENTIFIER = 'add_TestServiceServicer_to_server'


class _ServicerMethods(object):

    def __init__(self):
        self._condition = threading.Condition()
        self._paused = False
        self._fail = False

    @contextlib.contextmanager
    def pause(self):  # pylint: disable=invalid-name
        with self._condition:
            self._paused = True
        yield
        with self._condition:
            self._paused = False
            self._condition.notify_all()

    @contextlib.contextmanager
    def fail(self):  # pylint: disable=invalid-name
        with self._condition:
            self._fail = True
        yield
        with self._condition:
            self._fail = False

    def _control(self):  # pylint: disable=invalid-name
        with self._condition:
            if self._fail: