py/test/pytests/bft_fixture.py

# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""A generic interface to control the BFT fixture."""

import logging
import time
import unittest

import factory_common  # pylint: disable=unused-import
from cros.factory.test.fixture import bft_fixture
from cros.factory.utils.arg_utils import Arg


class BFTFixture(unittest.TestCase):
  ARGS = [
      Arg('bft_fixture', dict, bft_fixture.TEST_ARG_HELP),
      Arg('method', str, 'BFTFixture method to call.'),
      Arg('args', (list, tuple), 'args of the method.',
          default=(), optional=True),
      Arg('retry_secs', (int, float),
          'retry interval in seconds (or None for no retry)',
          optional=True),
  ]

  def runTest(self):
    while True:
      fixture = None
      try:
        fixture = bft_fixture.CreateBFTFixture(**self.args.bft_fixture)
        getattr(fixture, self.args.method)(*self.args.args)
        break  # Success; we're done
      except:  # pylint: disable=bare-except
        logging.exception('BFT fixture test failed')
        if not self.args.retry_secs:
          # No retry; raise the exception to fail the test
          raise
      finally:
        if fixture:
          try:
            fixture.Disconnect()
          except:  # pylint: disable=bare-except
            logging.exception('Unable to disconnect fixture')

      logging.info('Will retry in %s secs', self.args.retry_secs)
      time.sleep(self.args.retry_secs)