def test_starting_a_stopping_thread_restarts(self):
allow_stop = Event()
def thread_func(ctx):
try:
while not ctx.stop_requested:
ctx.sleep(0.1)
except InterruptedError:
pass
finally:
print('Waiting for allow_stop event')
allow_stop.wait(2)
allow_stop.clear()
print('allow_stop event set')
tw = ThreadWrapper(thread_func)
tw.start().wait()
tw.stop()
tw.start()
self.assertEqual(ThreadWrapper.STOPPING, tw.state)
allow_stop.set()
time.sleep(0.1)
self.assertEqual(ThreadWrapper.RUNNING, tw.state)
allow_stop.set()
tw.exit()
def test_callback_is_called_when_thread_stops(self):
mock = Mock(return_value=None)
tw = ThreadWrapper(lambda _: None)
tw.on_stopped(mock)
try:
for i in range(3):
tw.start()
tw.stop().wait()
self.assertEqual(ThreadWrapper.STOPPED, tw.state)
self.assertNotEqual(0, mock.call_count)
finally:
tw.exit()
def test_thread_wrapper_can_be_exited_if_started(self):
mock = Mock()
tw = ThreadWrapper(lambda x: None)
tw.on_stopped(mock)
tw.start()
tw.exit()
self.assertEqual(1, mock.call_count)
def __init__(self, owner: 'ScriptManager', script, name,
global_variables: dict):
self._owner = owner
self._globals = global_variables.copy()
self._inputs = {}
self._runnable = script
self.sleep = self._default_sleep
self._thread = ThreadWrapper(self._run, f'ScriptThread: {name}')
self.log = get_logger(f'Script: {name}')
self.stop = self._thread.stop
self.cleanup = self._thread.exit
self.on_stopped = self._thread.on_stopped
self.on_stopping = self._thread.on_stop_requested
assert (callable(script))
self.log('Created')
def test_exiting_thread_can_not_be_restarted(self):
counter = 0
def thread_func(ctx):
nonlocal counter
counter += 1
while not ctx.stop_requested:
ctx.sleep(0.1)
def _try_restart():
self.assertRaises(AssertionError, tw.start)
tw = ThreadWrapper(thread_func)
tw.on_stopped(_try_restart)
tw.start()
tw.exit()
self.assertEqual(1, counter)
def test_stop_callbacks_called_when_thread_fn_exits(self):
evt = Event()
def test_fn(_):
pass
tw = ThreadWrapper(test_fn)
try:
for i in range(1, 3):
with self.subTest(f'Run #{i}'):
tw.on_stopped(evt.set)
evt.clear()
tw.start()
if not evt.wait(2):
self.fail('Thread function has not exited properly')
finally:
tw.exit()
def test_exiting_a_running_thread_stops_it(self):
mock = Mock()
def test_fn(ctx):
evt = Event()
ctx.on_stopped(evt.set)
evt.wait()
mock()
tw = ThreadWrapper(test_fn)
tw.start().wait()
tw.exit()
self.assertEqual(1, mock.call_count)
def test_thread_function_can_observe_stop_request(self):
mock = Mock()
thread_started_evt = Event()
def _dummy_thread_fn(ctx: ThreadContext):
thread_started_evt.set()
evt = Event()
ctx.on_stopped(evt.set)
evt.wait()
mock()
tw = ThreadWrapper(_dummy_thread_fn)
try:
tw.start()
if not thread_started_evt.wait(2):
self.fail('Thread function was not executed')
tw.stop().wait()
self.assertEqual(1, mock.call_count)
finally:
tw.exit()
def test_start_does_not_raise_if_not_exited(self):
def test_fn(_):
print('running')
tw = ThreadWrapper(test_fn)
try:
# this is a probabilistic failure, false negatives may happen still if the implementation is incorrect
start = time.time()
while time.time() - start < 5:
for _ in range(10000):
tw.start()
except AssertionError:
self.fail('start() raised event')
finally:
tw.exit()
def test_thread_function_receives_stop_signal(self):
mock = Mock()
stop_req_mock = Mock()
thread_started_evt = Event()
def _dummy_thread_fn(ctx: ThreadContext):
mock()
ctx.on_stopped(stop_req_mock) # stop signal calls callback
thread_started_evt.set()
while not ctx.stop_requested: # stop signal can be polled
time.sleep(0.001)
tw = ThreadWrapper(_dummy_thread_fn)
try:
tw.start()
thread_started_evt.wait()
self.assertEqual(1, mock.call_count)
tw.stop().wait()
self.assertEqual(1, stop_req_mock.call_count)
finally:
tw.exit()
def test_exception_stops_properly(self):
evt = Event()
def _dummy_thread_fn(): # wrong signature, results in TypeError
pass
tw = ThreadWrapper(_dummy_thread_fn)
try:
for i in range(1, 3):
with self.subTest(f'Run #{i}'):
tw.on_stopped(evt.set) # set callback first to verify it will be called after clear
evt.clear()
if not tw.start().wait(2):
self.fail('Thread was not started properly')
if not evt.wait(2):
self.fail('Thread was not stopped properly')
finally:
tw.exit()
def test_stopping_a_starting_thread_stops_thread(self):
mock = Mock()
def test_fn(ctx):
evt = Event()
ctx.on_stopped(evt.set)
if not evt.wait(2):
self.fail('Thread stop was not called')
mock()
tw = ThreadWrapper(test_fn)
try:
# this is a probabilistic failure, false positives may happen still if the implementation is incorrect
for i in range(1000):
mock.reset_mock()
tw.start()
if not tw.stop().wait(2):
self.fail('Failed to stop thread')
self.assertEqual(ThreadWrapper.STOPPED, tw.state)
self.assertEqual(1, mock.call_count)
finally:
tw.exit()
def test_thread_function_runs_only_once_per_start(self):
mock = Mock()
evt = Event()
def test_fn(_):
mock()
evt.set()
tw = ThreadWrapper(test_fn)
try:
for i in range(1, 3):
with self.subTest(f'Run #{i}'):
evt.clear()
tw.start()
if not evt.wait(2):
self.fail('Thread function was not executed')
self.assertEqual(i, mock.call_count)
finally:
tw.exit()
class ScriptHandle:
def _default_sleep(self, _):
self.log('Error: default sleep called')
raise Exception('Script not running')
def __init__(self, owner: 'ScriptManager', script, name,
global_variables: dict):
self._owner = owner
self._globals = global_variables.copy()
self._inputs = {}
self._runnable = script
self.sleep = self._default_sleep
self._thread = ThreadWrapper(self._run, f'ScriptThread: {name}')
self.log = get_logger(f'Script: {name}')
self.stop = self._thread.stop
self.cleanup = self._thread.exit
self.on_stopped = self._thread.on_stopped
self.on_stopping = self._thread.on_stop_requested
assert (callable(script))
self.log('Created')
@property
def is_stop_requested(self):
return self._thread.state in [
ThreadWrapper.STOPPING, ThreadWrapper.STOPPED
]
@property
def is_running(self):
return self._thread.is_running
def assign(self, name, value):
self._globals[name] = value
def _run(self, ctx):
try:
# script control interface
def _terminate():
self.stop()
raise InterruptedError
ctx.terminate = _terminate
ctx.terminate_all = self._owner.stop_all_scripts
self.sleep = ctx.sleep
self.log("Starting script")
self._runnable(Control=ctx,
ctx=ctx,
time=TimeWrapper(ctx),
**self._inputs)
except InterruptedError:
self.log('Interrupted')
raise
finally:
# restore to release reference on context
self.log("Script finished")
self.sleep = self._default_sleep
def start(self, **kwargs):
if not kwargs:
self._inputs = self._globals
else:
self._inputs = {**self._globals, **kwargs}
return self._thread.start()
def create_remote_controller_thread(rcs: RemoteControllerScheduler):
return ThreadWrapper(rcs.handle_controller, "RemoteControllerThread")
def test_thread_wrapper_can_be_exited_if_not_started(self):
tw = ThreadWrapper(lambda: None)
tw.exit()
def test_sleep_on_context_is_interrupted_when_thread_is_stopped(self):
tw = ThreadWrapper(lambda ctx: ctx.sleep(10000))
start_time = time.time()
tw.start().wait()
tw.exit()
self.assertLess(time.time() - start_time, 2)
def test_waiting_for_a_stopped_thread_to_stop_does_nothing(self):
tw = ThreadWrapper(lambda ctx: None)
tw.start().wait()
tw.stop().wait()
tw.stop().wait()
tw.exit()
def test_exited_thread_can_not_be_restarted(self):
tw = ThreadWrapper(lambda x: None)
tw.exit()
self.assertRaises(AssertionError, tw.start)
