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# Copyright 2016 Google Inc. All Rights Reserved.
#
# 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.
from __future__ import print_function
import fnmatch
import os
import tempfile
import nox
try:
import ci_diff_helper
except ImportError:
ci_diff_helper = None
#
# Helpers and utility functions
#
def _list_files(folder, pattern):
"""Lists all files below the given folder that match the pattern."""
for root, folders, files in os.walk(folder):
for filename in files:
if fnmatch.fnmatch(filename, pattern):
yield os.path.join(root, filename)
def _collect_dirs(
start_dir,
blacklist=set(['conftest.py', 'nox.py']),
suffix='_test.py'):
"""Recursively collects a list of dirs that contain a file matching the
given suffix.
This works by listing the contents of directories and finding
directories that have `*_test.py` files.
"""
# Collect all the directories that have tests in them.
for parent, subdirs, files in os.walk(start_dir):
if any(f for f in files if f.endswith(suffix) and f not in blacklist):
# Don't recurse further, since py.test will do that.
del subdirs[:]
# This dir has tests in it. yield it.
yield parent
else:
# Filter out dirs we don't want to recurse into
subdirs[:] = [
s for s in subdirs
if s[0].isalpha() and
os.path.join(parent, s) not in blacklist]
def _get_changed_files():
"""Returns a list of files changed for this pull request / push.
If running on a public CI like Travis or Circle this is used to only
run tests/lint for changed files.
"""
if not ci_diff_helper:
return None
try:
config = ci_diff_helper.get_config()
except OSError: # Not on CI.
return None
changed_files = ci_diff_helper.get_changed_files('HEAD', config.base)
changed_files = set([
'./{}'.format(filename) for filename in changed_files])
return changed_files
def _filter_samples(sample_dirs, changed_files):
"""Filers the list of sample directories to only include directories that
contain files in the list of changed files."""
result = []
for sample_dir in sample_dirs:
for changed_file in changed_files:
if changed_file.startswith(sample_dir):
result.append(sample_dir)
return list(set(result))
def _determine_local_import_names(start_dir):
"""Determines all import names that should be considered "local".
This is used when running the linter to insure that import order is
properly checked.
"""
file_ext_pairs = [os.path.splitext(path) for path in os.listdir(start_dir)]
return [
basename
for basename, extension
in file_ext_pairs
if extension == '.py' or os.path.isdir(
os.path.join(start_dir, basename))
and basename not in ('__pycache__')]
#
# App Engine specific helpers
#
_GAE_ROOT = os.environ.get('GAE_ROOT')
if _GAE_ROOT is None:
_GAE_ROOT = tempfile.mkdtemp()
def _setup_appengine_sdk(session):
"""Installs the App Engine SDK, if needed."""
session.env['GAE_SDK_PATH'] = os.path.join(_GAE_ROOT, 'google_appengine')
session.run('gcp-devrel-py-tools', 'download-appengine-sdk', _GAE_ROOT)
#
# Test sessions
#
PYTEST_COMMON_ARGS = []
FLAKE8_COMMON_ARGS = [
'--show-source', '--builtin', 'gettext', '--max-complexity', '20',
'--import-order-style', 'google',
'--exclude', '.nox,.cache,env,lib,generated_pb2,*_pb2.py,*_pb2_grpc.py',
]
# Collect sample directories.
ALL_TESTED_SAMPLES = sorted(list(_collect_dirs('.')))
ALL_SAMPLE_DIRECTORIES = sorted(list(_collect_dirs('.', suffix='.py')))
GAE_STANDARD_SAMPLES = [
sample for sample in ALL_TESTED_SAMPLES
if sample.startswith('./appengine/standard')]
NON_GAE_STANDARD_SAMPLES = sorted(
list(set(ALL_TESTED_SAMPLES) - set(GAE_STANDARD_SAMPLES)))
# Filter sample directories if on a CI like Travis or Circle to only run tests
# for changed samples.
CHANGED_FILES = _get_changed_files()
if CHANGED_FILES is not None:
print('Filtering based on changed files.')
ALL_TESTED_SAMPLES = _filter_samples(
ALL_TESTED_SAMPLES, CHANGED_FILES)
ALL_SAMPLE_DIRECTORIES = _filter_samples(
ALL_SAMPLE_DIRECTORIES, CHANGED_FILES)
GAE_STANDARD_SAMPLES = _filter_samples(
GAE_STANDARD_SAMPLES, CHANGED_FILES)
NON_GAE_STANDARD_SAMPLES = _filter_samples(
NON_GAE_STANDARD_SAMPLES, CHANGED_FILES)
def _session_tests(session, sample, post_install=None):
"""Runs py.test for a particular sample."""
session.install('-r', 'testing/requirements.txt')
session.chdir(sample)
if os.path.exists(os.path.join(sample, 'requirements.txt')):
session.install('-r', 'requirements.txt')
if post_install:
post_install(session)
session.run(
'pytest',
*(PYTEST_COMMON_ARGS + session.posargs),
# Pytest will return 5 when no tests are collected. This can happen
# on travis where slow and flaky tests are excluded.
# See http://doc.pytest.org/en/latest/_modules/_pytest/main.html
success_codes=[0, 5])
@nox.parametrize('sample', GAE_STANDARD_SAMPLES)
def session_gae(session, sample):
"""Runs py.test for an App Engine standard sample."""
session.interpreter = 'python2.7'
# Create a lib directory if needed, otherwise the App Engine vendor library
# will complain.
if not os.path.isdir(os.path.join(sample, 'lib')):
os.mkdir(os.path.join(sample, 'lib'))
_session_tests(session, sample, _setup_appengine_sdk)
@nox.parametrize('sample', NON_GAE_STANDARD_SAMPLES)
def session_py27(session, sample):
"""Runs py.test for a sample using Python 2.7"""
session.interpreter = 'python2.7'
_session_tests(session, sample)
@nox.parametrize('sample', NON_GAE_STANDARD_SAMPLES)
def session_py35(session, sample):
"""Runs py.test for a sample using Python 3.5"""
session.interpreter = 'python3.5'
_session_tests(session, sample)
@nox.parametrize('sample', ALL_SAMPLE_DIRECTORIES)
def session_lint(session, sample):
"""Runs flake8 on the sample."""
session.install('flake8', 'flake8-import-order')
local_names = _determine_local_import_names(sample)
args = FLAKE8_COMMON_ARGS + [
'--application-import-names', ','.join(local_names),
'.']
session.chdir(sample)
session.run('flake8', *args)
#
# Utility sessions
#
def session_missing_tests(session):
"""Lists all sample directories that do not have tests."""
session.virtualenv = False
print('The following samples do not have tests:')
for sample in set(ALL_SAMPLE_DIRECTORIES) - set(ALL_TESTED_SAMPLES):
print('* {}'.format(sample))
SAMPLES_WITH_GENERATED_READMES = sorted(
list(_collect_dirs('.', suffix='.rst.in')))
@nox.parametrize('sample', SAMPLES_WITH_GENERATED_READMES)
def session_readmegen(session, sample):
"""(Re-)generates the readme for a sample."""
session.install('jinja2', 'pyyaml')
if os.path.exists(os.path.join(sample, 'requirements.txt')):
session.install('-r', os.path.join(sample, 'requirements.txt'))
in_file = os.path.join(sample, 'README.rst.in')
session.run('python', 'scripts/readme-gen/readme_gen.py', in_file)
def session_check_requirements(session):
"""Checks for out of date requirements and optionally updates them.
This is intentionally not parametric, as it's desired to never have two
samples with differing versions of dependencies.
"""
session.install('-r', 'testing/requirements.txt')
if 'update' in session.posargs:
command = 'update-requirements'
else:
command = 'check-requirements'
reqfiles = list(_list_files('.', 'requirements*.txt'))
for reqfile in reqfiles:
session.run('gcp-devrel-py-tools', command, reqfile)