Python clock.ThreadedClock類代碼示例

def test_announcer_under_abnormal_circumstances():
  mock_serverset = create_autospec(spec=ServerSet, instance=True)
  mock_serverset.join = MagicMock()
  mock_serverset.join.side_effect = [
      KazooException('Whoops the ensemble is down!'),
      'member0001',
  ]
  mock_serverset.cancel = MagicMock()

  endpoint = Endpoint('localhost', 12345)
  clock = ThreadedClock(31337.0)

  announcer = Announcer(
       mock_serverset, endpoint, clock=clock, exception_wait=Amount(2, Time.SECONDS))
  announcer.start()

  try:
    clock.tick(1.0)
    assert announcer.disconnected_time() == 1.0
    clock.tick(2.0)
    assert announcer.disconnected_time() == 0.0, (
        'Announcer should recover after an exception thrown internally.')
    assert announcer._membership == 'member0001'
  finally:
    announcer.stop()

def test_caching(getmtime_mock):
  URL = 'http://www.google.com'
  DATA = b'This is google.com!'
  clock = ThreadedClock()
  getmtime_mock.return_value = 0

  opener = MockOpener(DATA)
  web = CachedWeb(clock=clock, opener=opener)
  assert not os.path.exists(web.translate_url(URL))
  with contextlib.closing(web.open(URL)) as fp:
    assert fp.read() == DATA
  assert os.path.exists(web.translate_url(URL))
  assert opener.opened.is_set()
  opener.clear()

  assert web.expired(URL, ttl=0.5) is False
  clock.tick(1)
  assert web.expired(URL, ttl=0.5)

  with contextlib.closing(web.open(URL)) as fp:
    assert fp.read() == DATA
  assert not opener.opened.is_set()

  with contextlib.closing(web.open(URL, ttl=0.5)) as fp:
    assert fp.read() == DATA
  assert opener.opened.is_set(), 'expect expired url to cause http get'

def test_ttl_decrement_works():
  clock = ThreadedClock()
  pps = TestPingPongServer('foo', 31337, clock=clock)

  pps.ping('hello world', ttl=1)
  clock.tick(TestPingPongServer.PING_DELAY.as_(Time.SECONDS))
  pps.expect_calls()

def test_caching():
  URL = 'http://www.google.com'
  DATA = b'This is google.com!'
  clock = ThreadedClock()
  m = mox.Mox()
  m.StubOutWithMock(os.path, 'getmtime')
  os.path.getmtime(mox.IgnoreArg()).MultipleTimes().AndReturn(0)
  m.ReplayAll()

  opener = MockOpener(DATA)
  web = CachedWeb(clock=clock, opener=opener)
  assert not os.path.exists(web.translate_url(URL))
  with contextlib.closing(web.open(URL)) as fp:
    assert fp.read() == DATA
  assert os.path.exists(web.translate_url(URL))
  assert opener.opened.is_set()
  opener.clear()

  assert web.expired(URL, ttl=0.5) is False
  clock.tick(1)
  assert web.expired(URL, ttl=0.5)

  with contextlib.closing(web.open(URL)) as fp:
    assert fp.read() == DATA
  assert not opener.opened.is_set()

  with contextlib.closing(web.open(URL, ttl=0.5)) as fp:
    assert fp.read() == DATA
  assert opener.opened.is_set(), 'expect expired url to cause http get'

  m.UnsetStubs()
  m.VerifyAll()

def test_ping():
  clock = ThreadedClock()
  pps = TestPingPongServer('foo', 31337, clock=clock)

  pps.ping('hello world', ttl=2)
  clock.tick(TestPingPongServer.PING_DELAY.as_(Time.SECONDS))
  pps.expect_calls(('ping', 'hello world', 1))

  pps.ping('hello world', ttl=3)
  clock.tick(TestPingPongServer.PING_DELAY.as_(Time.SECONDS))
  pps.expect_calls(('ping', 'hello world', 2))

def test_defer():
  clock = ThreadedClock()
  DELAY = 3
  results = Queue(maxsize=1)
  def func():
    results.put_nowait('success')
  defer(func, delay=DELAY, clock=clock)
  with Timer(clock=clock) as timer:
    clock.tick(4)
    assert results.get() == 'success'
  assert timer.elapsed >= DELAY

def test_sleep_0():
    clock = ThreadedClock(0)
    event = threading.Event()

    def run():
        clock.sleep(0)
        event.set()

    th = threading.Thread(target=run)
    th.daemon = True
    th.start()

    assert clock.converge(threads=[th])
    assert event.is_set()

  def setUp(self):
    self._clock = ThreadedClock(0)
    self._checker = mock.Mock(spec=HttpSignaler)

    self.fake_health_checks = []
    def mock_health_check():
      return self.fake_health_checks.pop(0)
    self._checker.health = mock.Mock(spec=self._checker.__call__)
    self._checker.health.side_effect = mock_health_check

def test_defer():
  DELAY = 3

  clock = ThreadedClock()
  results = Queue(maxsize=1)

  def func():
    results.put_nowait('success')

  defer(func, delay=DELAY, clock=clock)

  with Timer(clock=clock) as timer:
    with pytest.raises(Empty):
      results.get_nowait()
    clock.tick(DELAY + 1)
    assert results.get() == 'success'

  assert timer.elapsed == DELAY + 1

def test_announcer_under_abnormal_circumstances():
    mock_serverset = mock.MagicMock(spec=ServerSet)
    mock_serverset.join = mock.MagicMock()
    mock_serverset.join.side_effect = [KazooException("Whoops the ensemble is down!"), "member0001"]
    mock_serverset.cancel = mock.MagicMock()

    endpoint = Endpoint("localhost", 12345)
    clock = ThreadedClock(31337.0)

    announcer = Announcer(mock_serverset, endpoint, clock=clock, exception_wait=Amount(2, Time.SECONDS))
    announcer.start()

    try:
        clock.tick(1.0)
        assert announcer.disconnected_time() == 1.0
        clock.tick(2.0)
        assert announcer.disconnected_time() == 0.0, "Announcer should recover after an exception thrown internally."
        assert announcer._membership == "member0001"
    finally:
        announcer.stop()

def test_sampler_base():
  class TestSampler(SamplerBase):
    def __init__(self, period, clock):
      self.count = 0
      SamplerBase.__init__(self, period, clock)

    def iterate(self):
      self.count += 1

  test_clock = ThreadedClock()
  sampler = TestSampler(Amount(1, Time.SECONDS), clock=test_clock)
  sampler.start()

  test_clock.tick(0.5)
  assert sampler.count == 0
  test_clock.tick(0.5)
  assert sampler.count == 1
  test_clock.tick(5)
  assert sampler.count == 6
  assert not sampler.is_stopped()
  sampler.stop()
  # make sure that stopping the sampler short circuits any sampling
  test_clock.tick(5)
  assert sampler.count == 6

def test_announcer_on_expiration():
  joined = threading.Event()
  operations = []

  def joined_side_effect(*args, **kw):
    # 'global' does not work within python nested functions, so we cannot use a
    # counter here, so instead we do append/len (see PEP-3104)
    operations.append(1)
    if len(operations) == 1 or len(operations) == 3:
      joined.set()
      return 'membership %d' % len(operations)
    else:
      raise KazooException('Failed to reconnect')

  mock_serverset = create_autospec(spec=ServerSet, instance=True)
  mock_serverset.join = MagicMock()
  mock_serverset.join.side_effect = joined_side_effect
  mock_serverset.cancel = MagicMock()

  endpoint = Endpoint('localhost', 12345)
  clock = ThreadedClock(31337.0)

  announcer = Announcer(
      mock_serverset, endpoint, clock=clock, exception_wait=Amount(2, Time.SECONDS))
  announcer.start()

  try:
    joined.wait(timeout=1.0)
    assert joined.is_set()
    assert announcer._membership == 'membership 1'
    assert announcer.disconnected_time() == 0.0
    clock.tick(1.0)
    assert announcer.disconnected_time() == 0.0
    announcer.on_expiration()  # expect exception
    clock.tick(1.0)
    assert announcer.disconnected_time() == 1.0, (
        'Announcer should be disconnected on expiration.')
    clock.tick(10.0)
    assert announcer.disconnected_time() == 0.0, (
        'Announcer should not advance disconnection time when connected.')
    assert announcer._membership == 'membership 3'

  finally:
    announcer.stop()

def test_announcer_under_normal_circumstances():
  joined = threading.Event()

  def joined_side_effect(*args, **kw):
    joined.set()
    return 'membership foo'

  mock_serverset = create_autospec(spec=ServerSet, instance=True)
  mock_serverset.join = MagicMock()
  mock_serverset.join.side_effect = joined_side_effect
  mock_serverset.cancel = MagicMock()

  endpoint = Endpoint('localhost', 12345)
  clock = ThreadedClock(31337.0)

  announcer = Announcer(mock_serverset, endpoint, clock=clock)
  assert announcer.disconnected_time() == 0.0
  clock.tick(1.0)
  assert announcer.disconnected_time() == 1.0, (
      'Announcer should advance disconnection time when not yet initially connected.')

  announcer.start()

  try:
    joined.wait(timeout=1.0)
    assert joined.is_set()

    assert announcer.disconnected_time() == 0.0
    clock.tick(1.0)
    assert announcer.disconnected_time() == 0.0, (
        'Announcer should not advance disconnection time when connected.')
    assert announcer._membership == 'membership foo'

  finally:
    announcer.stop()

  mock_serverset.cancel.assert_called_with('membership foo')

  assert announcer.disconnected_time() == 0.0
  clock.tick(1.0)
  assert announcer.disconnected_time() == 0.0, (
      'Announcer should not advance disconnection time when stopped.')

def test_tracing_timed():
  sio = Compatibility.StringIO()
  clock = ThreadedClock()
  final_trace = []

  class PrintTraceInterceptor(Tracer):
    def print_trace(self, *args, **kw):
      final_trace.append(self._local.parent)

  tracer = PrintTraceInterceptor(output=sio, clock=clock, predicate=lambda v: False)
  assert not hasattr(tracer._local, 'parent')

  with tracer.timed('hello'):
    clock.tick(1.0)
    with tracer.timed('world 1'):
      clock.tick(1.0)
    with tracer.timed('world 2'):
      clock.tick(1.0)

  assert len(final_trace) == 1
  final_trace = final_trace[0]
  assert final_trace._start == 0
  assert final_trace._stop == 3
  assert final_trace.duration() == 3
  assert final_trace.msg == 'hello'
  assert len(final_trace.children) == 2
  child = final_trace.children[0]
  assert child._start == 1
  assert child._stop == 2
  assert child.parent is final_trace
  assert child.msg == 'world 1'
  child = final_trace.children[1]
  assert child._start == 2
  assert child._stop == 3
  assert child.parent is final_trace
  assert child.msg == 'world 2'

  # should not log if verbosity low
  assert sio.getvalue() == ''

class TestHealthChecker(unittest.TestCase):
  def setUp(self):
    self._clock = ThreadedClock(0)
    self._checker = mock.Mock(spec=HttpSignaler)
    self.initial_interval_secs = 15
    self.interval_secs = 10
    self.fake_health_checks = []
    def mock_health_check():
      return self.fake_health_checks.pop(0)
    self._checker.health = mock.Mock(spec=self._checker.__call__)
    self._checker.health.side_effect = mock_health_check

  def append_health_checks(self, status, num_calls=1):
    for i in range(num_calls):
      self.fake_health_checks.append((status, 'reason'))

  def test_grace_period_2x_success(self):
    '''Grace period is 2 x interval and health checks succeed.'''

    self.append_health_checks(True, num_calls=2)
    hct = HealthChecker(
              self._checker.health,
              interval_secs=self.interval_secs,
              clock=self._clock)
    hct.start()
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult('Task is healthy.', TaskState.Value('TASK_RUNNING'))
    assert hct.threaded_health_checker.running is True
    hct.stop()
    assert self._checker.health.call_count == 1

  def test_grace_period_2x_failure_then_success(self):
    '''Grace period is 2 x interval and health checks fail then succeed.'''

    self.append_health_checks(False)
    self.append_health_checks(True)
    hct = HealthChecker(
              self._checker.health,
              interval_secs=self.interval_secs,
              clock=self._clock)
    hct.start()
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult(None, TaskState.Value('TASK_STARTING'))
    assert hct.threaded_health_checker.running is False
    self._clock.tick(self.interval_secs)
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult('Task is healthy.', TaskState.Value('TASK_RUNNING'))
    assert hct.threaded_health_checker.running is True
    hct.stop()
    assert self._checker.health.call_count == 2

  def test_grace_period_2x_failure(self):
    '''
      Grace period is 2 x interval and all health checks fail.
      Failures are ignored when in grace period.
    '''

    self.append_health_checks(False, num_calls=3)
    hct = HealthChecker(
              self._checker.health,
              interval_secs=self.interval_secs,
              clock=self._clock)
    hct.start()
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult(None, TaskState.Value('TASK_STARTING'))
    assert hct.threaded_health_checker.running is False
    self._clock.tick(self.interval_secs)
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult(None, TaskState.Value('TASK_STARTING'))
    assert hct.threaded_health_checker.running is False
    self._clock.tick(self.interval_secs)
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult('Failed health check! reason', TaskState.Value('TASK_FAILED'))
    assert hct.threaded_health_checker.running is False
    hct.stop()
    assert self._checker.health.call_count == 3

  def test_success_outside_grace_period(self):
    '''
    Health checks fail inside grace period, but pass outside and leads to success
    '''

    self.append_health_checks(False, num_calls=2)
    self.append_health_checks(True)
    hct = HealthChecker(
              self._checker.health,
              interval_secs=self.interval_secs,
              clock=self._clock)
    hct.start()
    assert self._clock.converge(threads=[hct.threaded_health_checker])
    self._clock.assert_waiting(hct.threaded_health_checker, self.interval_secs)
    assert hct.status == StatusResult(None, TaskState.Value('TASK_STARTING'))
    assert hct.threaded_health_checker.running is False
    self._clock.tick(self.interval_secs)
#.........這裏部分代碼省略.........