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# Copyright 2015, Google, Inc.

# 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.

#

"""

Common testing utilities between samples

"""

import contextlib

import os

import sys

import tempfile

import unittest

import httplib2

from nose.plugins.skip import SkipTest

from six.moves import cStringIO

try:

APPENGINE_AVAILABLE = True

from google.appengine.datastore import datastore_stub_util

from google.appengine.ext import testbed

from google.appengine.api import namespace_manager

except ImportError:

APPENGINE_AVAILABLE = False

RESOURCE_PATH = os.path.join(

os.path.abspath(os.path.dirname(__file__)), 'resources')

PROJECT_ID_ENV_VAR = 'TEST_PROJECT_ID'

BUCKET_NAME_ENV_VAR = 'TEST_BUCKET_NAME'

class CloudBaseTest(unittest.TestCase):

def setUp(self):

self.resource_path = RESOURCE_PATH

self.project_id = os.environ.get(PROJECT_ID_ENV_VAR)

if not self.project_id:

raise EnvironmentError(

'You must set the {} environment variable to a valid Google '

'Cloud project ID.'.format(PROJECT_ID_ENV_VAR))

self.bucket_name = os.environ.get(BUCKET_NAME_ENV_VAR)

if not self.bucket_name:

raise EnvironmentError(

'You must set the {} environment variable to a valid Google '

'Cloud Storage bucket.'.format(BUCKET_NAME_ENV_VAR))

class AppEngineTestbedCase(CloudBaseTest):

"""A base test case for common setup/teardown tasks for test."""

def setUp(self):

super(AppEngineTestbedCase, self).setUp()

if not APPENGINE_AVAILABLE:

raise SkipTest()

# A hack to prevent get_application_default from going GAE route.

self._server_software_org = os.environ.get('SERVER_SOFTWARE')

os.environ['SERVER_SOFTWARE'] = ''

# Setup the datastore and memcache stub.

# First, create an instance of the Testbed class.

self.testbed = testbed.Testbed()

# Then activate the testbed, which prepares the service stubs for

# use.

self.testbed.activate()

# Create a consistency policy that will simulate the High

# Replication consistency model.

self.policy = datastore_stub_util.PseudoRandomHRConsistencyPolicy(

probability=0)

# Initialize the datastore stub with this policy.

self.testbed.init_datastore_v3_stub(

datastore_file=tempfile.mkstemp()[1],

consistency_policy=self.policy)

self.testbed.init_memcache_stub()

# Setup remaining stubs.

self.testbed.init_app_identity_stub()

self.testbed.init_blobstore_stub()

self.testbed.init_user_stub()

self.testbed.init_taskqueue_stub(root_path='tests/resources')

self.taskqueue_stub = self.testbed.get_stub(

testbed.TASKQUEUE_SERVICE_NAME)

def tearDown(self):

super(AppEngineTestbedCase, self).tearDown()

if self._server_software_org:

os.environ['SERVER_SOFTWARE'] = self._server_software_org

self.testbed.deactivate()

def loginUser(self, email='user@example.com', id='123', is_admin=False):

self.testbed.setup_env(

user_email=email,

user_id=id,

user_is_admin='1' if is_admin else '0',

overwrite=True)

def runTasks(self):

tasks = self.taskqueue_stub.get_filtered_tasks()

for task in tasks:

namespace = task.headers.get('X-AppEngine-Current-Namespace', '')

previous_namespace = namespace_manager.get_namespace()

try:

namespace_manager.set_namespace(namespace)

self.app.post(

task.url,

task.extract_params(),

headers={

k: v for k, v in task.headers.iteritems()

if k.startswith('X-AppEngine')})

finally:

namespace_manager.set_namespace(previous_namespace)

@contextlib.contextmanager

def capture_stdout():

"""Capture stdout to a StringIO object."""

fake_stdout = cStringIO()

old_stdout = sys.stdout

try:

sys.stdout = fake_stdout

yield fake_stdout

finally:

sys.stdout = old_stdout

class Http2Mock(object):

"""Mock httplib2.Http"""

def __init__(self, responses):

self.responses = responses

def add_credentials(self, user, pwd):

self.credentials = (user, pwd)

def request(self, token_uri, method, body, headers=None, *args, **kwargs):

response = self.responses.pop(0)

self.status = response.get('status', 200)

self.body = response.get('body', '')

self.headers = response.get('headers', '')

return (self, self.body)

def __enter__(self):

self.httplib2_orig = httplib2.Http

httplib2.Http = self

return self

def __exit__(self, exc_type, exc_value, traceback):

httplib2.Http = self.httplib2_orig

def __call__(self, *args, **kwargs):

return self