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# Copyright 2017 The Abseil 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.
"""Helper script used by app_test.py."""
import os
import sys
try:
import faulthandler
except ImportError:
faulthandler = None
from absl import app
from absl import flags
FLAGS = flags.FLAGS
flags.DEFINE_boolean('faulthandler_sigsegv', False, 'raise SIGSEGV')
flags.DEFINE_boolean('raise_exception', False, 'Raise MyException from main.')
flags.DEFINE_boolean(
'raise_usage_error', False, 'Raise app.UsageError from main.')
flags.DEFINE_integer(
'usage_error_exitcode', None, 'The exitcode if app.UsageError if raised.')
flags.DEFINE_string(
'str_flag_with_unicode_args', u'thumb:\U0001F44D', u'smile:\U0001F604')
flags.DEFINE_boolean('print_init_callbacks', False,
'print init callbacks and exit')
class MyException(Exception):
pass
class MyExceptionHandler(app.ExceptionHandler):
def __init__(self, message):
self.message = message
def handle(self, exc):
sys.stdout.write('MyExceptionHandler: {}\n'.format(self.message))
def real_main(argv):
"""The main function."""
if os.environ.get('APP_TEST_PRINT_ARGV', False):
sys.stdout.write('argv: {}\n'.format(' '.join(argv)))
if FLAGS.raise_exception:
raise MyException
if FLAGS.raise_usage_error:
if FLAGS.usage_error_exitcode is not None:
raise app.UsageError('Error!', FLAGS.usage_error_exitcode)
else:
raise app.UsageError('Error!')
if FLAGS.faulthandler_sigsegv:
faulthandler._sigsegv() # pylint: disable=protected-access
sys.exit(1) # Should not reach here.
if FLAGS.print_init_callbacks:
app.call_after_init(lambda: _callback_results.append('during real_main'))
for value in _callback_results:
print('callback: {}'.format(value))
sys.exit(0)
# Ensure that we have a random C++ flag in flags.FLAGS; this shows
# us that app.run() did the right thing in conjunction with C++ flags.
helper_type = os.environ['APP_TEST_HELPER_TYPE']
if helper_type == 'clif':
if 'heap_check_before_constructors' in flags.FLAGS:
print('PASS: C++ flag present and helper_type is {}'.format(helper_type))
sys.exit(0)
else:
print('FAILED: C++ flag absent but helper_type is {}'.format(helper_type))
sys.exit(1)
elif helper_type == 'pure_python':
if 'heap_check_before_constructors' in flags.FLAGS:
print('FAILED: C++ flag present but helper_type is pure_python')
sys.exit(1)
else:
print('PASS: C++ flag absent and helper_type is pure_python')
sys.exit(0)
else:
print('Unexpected helper_type "{}"'.format(helper_type))
sys.exit(1)
def custom_main(argv):
print('Function called: custom_main.')
real_main(argv)
def main(argv):
print('Function called: main.')
real_main(argv)
flags_parser_argv_sentinel = object()
def flags_parser_main(argv):
print('Function called: main_with_flags_parser.')
if argv is not flags_parser_argv_sentinel:
sys.exit(
'FAILED: main function should be called with the return value of '
'flags_parser, but found: {}'.format(argv))
def flags_parser(argv):
print('Function called: flags_parser.')
if os.environ.get('APP_TEST_FLAGS_PARSER_PARSE_FLAGS', None):
FLAGS(argv)
return flags_parser_argv_sentinel
# Holds results from callbacks triggered by `app.run_after_init`.
_callback_results = []
if __name__ == '__main__':
kwargs = {'main': main}
main_function_name = os.environ.get('APP_TEST_CUSTOM_MAIN_FUNC', None)
if main_function_name:
kwargs['main'] = globals()[main_function_name]
custom_argv = os.environ.get('APP_TEST_CUSTOM_ARGV', None)
if custom_argv:
kwargs['argv'] = custom_argv.split(' ')
if os.environ.get('APP_TEST_USE_CUSTOM_PARSER', None):
kwargs['flags_parser'] = flags_parser
app.call_after_init(lambda: _callback_results.append('before app.run'))
app.install_exception_handler(MyExceptionHandler('first'))
app.install_exception_handler(MyExceptionHandler('second'))
app.run(**kwargs)
sys.exit('This is not reachable.')
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