def _threaded_post_alarm(self, task: Future, request: Callable[..., None],
*args: Any) -> None:
"""
Callback for the alarm queue.
Check result of the future task and print a log in case something went wrong
:param task: future task returned by the thread pool executor
"""
extra_info = "{}, {}".format(request, args)
if not task.done():
if task.running():
logger.warning(log_messages.THREADED_REQUEST_HAS_LONG_RUNTIME,
self.timeout, extra_info)
else:
logger.warning(log_messages.THREADED_REQUEST_IS_STALE,
extra_info)
task.cancel()
else:
try:
result = task.result()
logger.trace("Task {} completed with result: {}", extra_info,
result)
except CancelledError as e:
logger.error(log_messages.TASK_CANCELLED,
task,
extra_info,
e,
exc_info=True)
except Exception as e: # pylint: disable=broad-except
logger.error(log_messages.TASK_FAILED,
task,
extra_info,
e,
exc_info=True)
def wrapper(kill_switch):
if portage.getpid() == parent_pid:
# thread in main process
def done_callback(result):
result.cancelled() or result.exception() or result.result()
kill_switch.set()
def start_coroutine(future):
result = asyncio.ensure_future(coroutine_func(),
loop=parent_loop)
pending[id(result)] = result
result.add_done_callback(done_callback)
future.set_result(result)
future = Future()
parent_loop.call_soon_threadsafe(start_coroutine, future)
kill_switch.wait()
if not future.done():
future.cancel()
raise asyncio.CancelledError
elif not future.result().done():
future.result().cancel()
raise asyncio.CancelledError
else:
return future.result().result()
# child process
loop = global_event_loop()
try:
return loop.run_until_complete(coroutine_func())
finally:
loop.close()
def test_first_return_value(self):
"""Test that the value from the first returned non-cancelled future is returned"""
future1 = Future()
future2 = Future()
future3 = Future()
evt = self._make_event([self._exec.make_expected_function_call(future1),
self._exec.make_expected_function_call(future2),
self._exec.make_expected_function_call(future3)])
evt.go()
start = time.time()
self.assertIsNone(evt.first_result(1), "No completed futures, yet something returned")
duration = time.time() - start
# This one might be a bit too dependent on where the test is running. let's see how it goes...
self.assertAlmostEqual(1.0, duration, msg="Incorrect timeout duration", delta=0.5)
future1.cancel()
self.assertIsNone(evt.first_result(0), "One (ignored) cancelled future, yet something returned")
future3.set_result("WOOT")
self.assertEquals("WOOT", evt.first_result(0), "Future completed, yet value not returned")
def _ready_callback(self, fn, mapping, proxy: Future, future: Future):
""" Internally handles completion of dependencies
"""
with self._lock:
if not proxy in self._pending:
return
del self._pending[proxy]
if future.cancelled():
proxy.cancel()
if not proxy.set_running_or_notify_cancel():
return
exception = future.exception()
if exception is not None:
proxy.set_exception(exception)
return
if mapping is None:
dependencies = future.result()
else:
dependencies = mapping(*future.result())
internal = self._executor.submit(fn, *dependencies)
internal.add_done_callback(partial(self._done_callback, proxy))
async def _call_func(self, func: Callable, args: tuple, kwargs: Dict[str, Any],
future: Future) -> None:
def callback(f: Future) -> None:
if f.cancelled():
self.call(scope.cancel)
try:
retval = func(*args, **kwargs)
if iscoroutine(retval):
with CancelScope() as scope:
if future.cancelled():
scope.cancel()
else:
future.add_done_callback(callback)
retval = await retval
except self._cancelled_exc_class:
future.cancel()
except BaseException as exc:
if not future.cancelled():
future.set_exception(exc)
# Let base exceptions fall through
if not isinstance(exc, Exception):
raise
else:
if not future.cancelled():
future.set_result(retval)
finally:
scope = None # type: ignore[assignment]
def cancel_future(self, *, future: Future, exception: Exception) -> None:
# cancel the task for this event
if config.current.parallel_processing != "process":
LOG.warning(
f"Cancel task on boundary event was requested, "
f"but the ADHESIVE_PARALLEL_PROCESSING is not set "
f"to 'process', but '{config.current.parallel_processing}'. "
f"The result of the task is ignored, but the thread "
f"keeps running in the background."
)
if future in self.futures:
future_mapping = self.futures[future]
LOG.warning(f"Cancelling active future '{future_mapping.description}'")
# The futures are queried later since they are still in the `futures` map
# inside the project executor. So to ensure they won't throw an exception,
# that won't be able to find the owning events anymore - since they are
# being removed now with the `DONE` call, we'll remove the futures from
# polling.
self.remove_future(future)
else:
LOG.warning(f"Cancelling active future '{future}'")
future.cancel()
# FIXME: hack. It seems that the `set_exception` is not needed, but
# if cancel isn't called, the process isn't terminated. If it's called
# after set_exception, again it isn't terminated.
try:
future.set_exception(exception)
except Exception:
pass
def test_job_done_callback_bails_out_if_canceled(self, mock_restore):
future = Future()
future.cancel()
self.assertTrue(future.cancelled())
rsc = Mock()
self.executor.job_done_callback(rsc, self.logger, future)
self.assertEqual(mock_restore.call_args, call(rsc, self.logger))
self.assertTrue(self.executor.exceptions.empty())
def test_no_result_copy_cancel(self):
source = Future()
target = Future()
copy(source, target, copy_result=False)
source.cancel()
self.assertTrue(target.cancel())
self.assertTrue(target.done())
def test_propagates_only_once_2():
rpc_fut = RPCFuture()
fut = Future()
rpc_fut.attach(fut)
fut.set_result(42)
fut.cancel()
assert rpc_fut.result(timeout=1) == 42
def test_copy_cancel(self):
source = Future()
target = Future()
copy(source, target)
source.cancel()
self.assertTrue(target.cancel())
self.assertTrue(target.done())
def test_no_cancel_copy_cancel(self):
source = Future()
target = Future()
copy(source, target, copy_cancel=False)
source.cancel()
self.assertFalse(target.cancelled())
self.assertFalse(target.done())
async def _call_func(self, func: Callable, args: tuple, future: Future) -> None:
try:
retval = func(*args)
if isinstance(retval, Coroutine):
future.set_result(await retval)
else:
future.set_result(retval)
except self._cancelled_exc_class:
future.cancel()
except BaseException as exc:
future.set_exception(exc)
def _done_callback(self, proxy: Future, future: Future):
""" Internally handles completion of executor future, copies result to proxy
Args:
fn (function): [description]
future (Future): [description]
"""
if future.cancelled():
proxy.cancel()
exception = future.exception()
if exception is not None:
proxy.set_exception(exception)
else:
result = future.result()
proxy.set_result(result)
def test_await_all_futures(self):
"""Test that the await_all_futures call will return all complete, non-cancelled futures"""
future1 = Future()
future2 = Future()
evt = self._make_event([self._exec.make_expected_function_call(future1),
self._exec.make_expected_function_call(future2)])
evt.go()
self.assertListEqual([], evt.await_all(0), "No ready futures, but something returned")
future1.cancel()
future2.set_result("WOOT")
self.assertListEqual([future2], evt.await_all(0), "Single future was not returned after cancel/complete")
class Zipper(object):
def __init__(self, fs):
self.fs = list(fs)
self.out = Future()
self.done = False
self.lock = Lock()
self.count_remaining = len(self.fs)
for (idx, future) in enumerate(self.fs):
chain_cancel(self.out, future)
future.add_done_callback(
weak_callback(partial(self.handle_done, idx)))
def handle_done(self, index, f):
set_result = False
set_exception = False
cancel = False
with self.lock:
if self.done:
pass
elif f.cancelled():
self.done = True
cancel = True
elif f.exception():
self.done = True
set_exception = True
else:
self.fs[index] = f.result()
self.count_remaining -= 1
if self.count_remaining == 0:
self.done = True
set_result = True
if cancel:
self.out.cancel()
if set_result:
try_set_result(self.out, maketuple(self.fs))
if set_exception:
copy_future_exception(f, self.out)
def _copy(self, src: Future, dst: Future) -> None:
gotit = self._lock.acquire(blocking=False)
if not gotit:
return
try:
if self._fired:
return
self._fired = True
if src.cancelled():
dst.cancel()
return
try:
dst.set_result(src.result())
except Exception as e:
dst.set_exception(e)
finally:
self._lock.release()
def test_zip_inner_cancel():
f_a = f_return("a")
f_b = Future()
f_c = Future()
future = f_zip(f_a, f_b, f_c)
assert f_b.cancel()
# Cancelling the inner future should cause the outer
# future to also become cancelled, as well as the
# other inner futures.
assert f_c.cancelled()
assert future.cancelled()
class Section(ReprableMixin):
"""
A collection of orders.
:param orders: a list of orders
:param disposition: if Disposition.JOINABLE then this section can be joined with
other sections. If Disposition.CANNOT_JOIN then all orders from this section
will be executed before proceeding to next one
"""
_REPR_FIELDS = ('orders', 'disposition')
__slots__ = ('orders', 'disposition', 'future')
def __init__(self, orders: tp.List[Order] = None,
disposition: Disposition = Disposition.JOINABLE):
self.future = Future()
self.orders = orders or []
self.disposition = disposition
def cancel(self) -> bool:
return self.future.cancel()
def result(self, timeout: tp.Optional[float] = None):
self.future.result(timeout)
def __bool__(self) -> bool:
return bool(self.orders)
@classmethod
def from_json(cls, dct: dict):
return Section(orders_from_list(dct['orders']), Disposition(dct.get('disposition', 0)))
def __iadd__(self, other: tp.Union[Order, 'Section']) -> 'Section':
if isinstance(other, Order):
self.orders.append(other)
else:
other.future = self.future
self.orders.extend(other.orders)
return self
def is_joinable(self) -> bool:
return self.disposition == Disposition.JOINABLE
def max_wait(self) -> tp.Optional[float]:
wait = None
for order in (or_ for or_ in self.orders if isinstance(or_, WaitOrder)):
if wait is None:
wait = order.period
else:
if wait < order.period:
wait = order.period
return wait
class _Chain(object):
""" A linked list of futures.
Each future yields a result and the next link in the chain
"""
def __init__(self):
self._next = Future()
def push(self, value):
"""Sets the value of this link in the chain waking up all waiting
listeners and returns a reference to the next link.
"""
next_ = _Chain()
self._next.set_result((value, next_))
return next_
def close(self):
"""Finish the chain at this link. It will not given a value.
All current and future listeners will be woken with a
:exception:`ClosedError` and it will no longer be possible to add new
links.
"""
self._next.cancel()
def wait(self, timeout=None):
try:
result = self._next.result(timeout)
except CancelledError:
raise ClosedError()
return result
def wait_result(self, timeout=None):
return self.wait(timeout)[0]
def wait_next(self, timeout=None):
return self.wait(timeout)[1]
class AsyncioExecutorFuture:
def __init__(self, response):
self._fut = Future()
self._response = response
response.add_done_callback(self._on_response_done)
self._asyncio_task = None
self._canceled = False
def __getattr__(self, name):
return getattr(self._fut, name)
def cancel(self):
if self._canceled:
return
self._canceled = True
self._fut.cancel()
return True
def _on_task_done(self, asyncio_task):
if self._canceled:
return
error = result = None
try:
error = asyncio_task.exception()
if error is None:
result = asyncio_task.result()
except CancelledError:
self._fut.cancel()
else:
if error is None:
self._fut.set_result(result)
else:
self._fut.set_exception(error)
def _on_response_done(self, response):
if self._canceled:
return
try:
asyncio_task = response.result()
except CancelledError:
self._fut.cancel()
else:
self._asyncio_task = asyncio_task
asyncio_task.add_done_callback(self._on_task_done)
class ExpectationBase(ABC):
always_monitor = False
def __init__(self):
self._future = Future()
self._awaited = False
self._scheduler = None
self._success = False
self._timeout = None
self._deadline = None
self._timedout = False
# FIXME: float_tol should be moved to ArsdkExpectationBase
self._float_tol = DEFAULT_FLOAT_TOL
def _schedule(self, scheduler):
# This expectation is scheduled on the `scheduler`, subclasses of ExpectationBase can
# perform some operations on this scheduler: schedule another expectation later or
# perform an operation on the scheduler object when this expectation is schedule (like
# sending a message for which this expectation object expect some result).
# IMPORTANT NOTE: this function (or its overridden versions) should be non-blocking
self._awaited = True
self._scheduler = scheduler
if self._timeout is not None:
self._deadline = timestamp_now() + self._timeout
def success(self):
return self._success
def wait(self, _timeout=None):
if self._awaited:
try:
self._future.result(timeout=_timeout)
except FutureTimeoutError:
self.set_timedout()
except FutureCancelledError:
self.cancel()
return self
def add_done_callback(self, cb):
self._future.add_done_callback(lambda f: cb(self))
def set_success(self):
if not self._future.done():
self._success = True
self._future.set_result(self.received_events())
return True
return False
def set_exception(self, exception):
if not self._future.done():
self._future.set_exception(exception)
def set_timeout(self, _timeout):
self._timeout = _timeout
def set_timedout(self):
if self._future.done():
return False
if not self._success:
self._timedout = True
self.cancel()
return True
return False
def cancel(self):
if self._future.done():
return False
self._future.cancel()
return True
def cancelled(self):
return self._future.cancelled()
def timedout(self):
if self._timedout:
return True
if self._success:
return False
if self._deadline is not None:
timedout = timestamp_now() > self._deadline
if timedout:
self.set_timedout()
return self._timedout
def set_float_tol(self, _float_tol):
self._float_tol = _float_tol
def base_copy(self, *args, **kwds):
other = self.__class__(*args, **kwds)
ExpectationBase.__init__(other)
other._timeout = self._timeout
other._float_tol = self._float_tol
return other
@abstractmethod
def copy(self):
"""
All expectations sublclasses must implement a shallow copy.
"""
pass
def done(self):
return (self._future.done() or not self._awaited) and self._success
def __bool__(self):
return self.done()
def __or__(self, other):
return WhenAnyExpectation([self, other])
def __and__(self, other):
return WhenAllExpectations([self, other])
def __rshift__(self, other):
return WhenSequenceExpectations([self, other])
__nonzero__ = __bool__
class ExpectationBase(object):
__metaclass__ = ABCMeta
def __init__(self):
self._future = Future()
self._awaited = False
self._scheduler = None
self._success = False
self._timeout = None
self._deadline = None
self._timedout = False
self._float_tol = DEFAULT_FLOAT_TOL
def _schedule(self, scheduler):
# This expectation is scheduled on the `scheduler`, subclasses of ExpectationBase can
# perform some operations on this scheduler: schedule another expectation later or
# perform an operation on the scheduler object when this expectation is schedule (like
# sending a message for which this expectation object expect some result).
self._awaited = True
self._scheduler = scheduler
if self._timeout is not None:
self._deadline = timestamp_now() + self._timeout
def success(self):
return self._success
def wait(self, _timeout=None):
if self._awaited:
try:
self._future.result(timeout=_timeout)
except FutureTimeoutError:
self.set_timedout()
except FutureCancelledError:
self.cancel()
return self
def set_result(self):
self._success = True
return self._future.set_result(self.received_events())
def set_exception(self, exception):
return self._future.set_exception(exception)
def set_timeout(self, _timeout):
self._timeout = _timeout
def set_timedout(self):
if not self._success:
self._timedout = True
self.cancel()
def cancel(self):
return self._future.cancel()
def cancelled(self):
return self._future.cancelled()
def timedout(self):
if self._timedout:
return True
if self._success:
return False
if self._deadline is not None:
self._timedout = (timestamp_now() > self._deadline)
if self._timedout:
self.cancel()
return self._timedout
def set_float_tol(self, _float_tol):
self._float_tol = _float_tol
def base_copy(self, *args, **kwds):
other = self.__class__(*args, **kwds)
ExpectationBase.__init__(other)
other._timeout = self._timeout
other._float_tol = self._float_tol
return other
@abstractmethod
def copy(self):
"""
All expectations sublclasses must implement a shallow copy.
"""
pass
def done(self):
return (self._future.done() or not self._awaited) and self._success
def __bool__(self):
return self.done()
def __or__(self, other):
return ArsdkWhenAnyExpectation([self, other])
def __and__(self, other):
return ArsdkWhenAllExpectations([self, other])
def __rshift__(self, other):
return ArsdkWhenSequenceExpectations([self, other])
__nonzero__ = __bool__
class Auth(object):
def __init__(self, stream):
self.stream = stream
self.auth_task = None
self.bind_func = None
self.response_fut = None
self.responses = None
stream.credentials = {} # feature_mechanisms need this
stream.register_plugin('feature_mechanisms')
stream.register_handler(
Callback('Auth', StanzaPath('auth'), self._handle_auth))
stream.register_handler(
Callback('Auth Response', StanzaPath('response'),
self._handle_response))
stream.register_handler(
Callback('Auth Abort', StanzaPath('abort'), self._handle_abort))
if LegacyAuth.available(self):
# need to explicitly specify module here since xep_0078
# is purposefully unavailable by default
stream.register_plugin('xep_0078', module=xep_0078)
stream.register_handler(
Callback('LegacyAuth', StanzaPath('iq/auth'),
self._handle_legacy_auth))
stream.register_plugin('feature_bind')
stream.register_handler(
Callback('Bind', StanzaPath('iq/bind'), self._handle_bind))
stream.register_plugin('feature_session')
stream.register_handler(
Callback('Session', StanzaPath('iq/session'),
self._handle_session))
stream.add_event_handler('disconnected', self._disconnected)
async def get_features(self):
features = StreamFeatures()
available = await get_sasl_available(self)
features['mechanisms'] = [m.name for m in available]
if await LegacyAuth.available(self):
features._get_plugin('auth')
features._get_plugin('register')
return features
async def generate_resource_id(self):
return uuid.uuid4().hex
async def generate_anonymous_user(self):
return uuid.uuid4().hex
async def check_password(self, username, password):
if not password:
# client didn't supply a password, maybe they
# want web session authentication
web_user = self.stream.web_user
if web_user:
return await self.stream.auth_hook.check_webuser(
self.stream, web_user, username)
# if web authentication isn't available,
# we won't allow passwordless logins
elif password.startswith('//jid/'):
# seems to be a session token
return await self.stream.auth_hook.check_token(
self.stream, username, password[6:])
elif settings.ALLOW_PLAIN_PASSWORD:
# ordinary password
return await self.stream.auth_hook.check_password(
self.stream, username, password)
return False
async def prebound(self):
if 'mechanisms' not in self.stream.features:
await self._auth_success()
await self._bind_attempt()
await self._bind_success()
def _disconnected(self, reason):
self._abort_auth()
async def _auth_success(self):
jid = self.stream.boundjid.bare
self.stream.update_logger({'jid': jid})
self.stream.logger.info('Authenticated as %s', jid)
self.stream.features.add('mechanisms')
self.stream.prepare_features()
await self.stream.auth_hook.bind(self.stream)
self.stream.event('auth_success', self.stream.boundjid)
async def _async_challenge(self, data):
challenge = auth_stanza.Challenge()
challenge['value'] = data
self.stream.send(challenge)
while not self.responses:
self.stream.send_thaw()
await wrap_future(self.response_fut)
self.response_fut = Future()
self.stream.send_freeze()
return self.responses.pop(0)
async def _auth_task(self, auth, process):
try:
ret = process(auth)
if iscoroutine(ret):
await ret
except Exception as e:
self.stream.logger.info('Authentication failure')
reply = auth_stanza.Failure()
if isinstance(e, XMPPError):
reply['condition'] = e.condition
elif isinstance(e, UnicodeDecodeError):
reply['condition'] = 'malformed-request'
else:
reply['condition'] = 'temporary-auth-failure'
self.stream.logger.exception(
'Unhandled authentication exception')
self.stream.send(reply)
self.stream.send_thaw()
else:
# TODO: what if self.responses is non-empty
# (i.e., we've received too many responses?)
self.responses = None
self.response_fut = None
self.stream.send(auth_stanza.Success())
await self._auth_success()
if self.bind_func:
await self.bind_func
self.stream.send_thaw()
self.auth_task = None
def _handle_auth(self, auth):
# TODO: handle unexpected auth
if 'mechanisms' in self.stream.features or self.auth_task:
# already authenticated, or in progress
# TODO: send error?
return
mech = get_sasl_by_name(auth['mechanism'])
if not mech or not mech.available(self):
reply = auth_stanza.Failure()
reply['condition'] = 'invalid-mechanism'
self.stream.send(reply)
return
self.stream.send_freeze()
task = self._auth_task(auth, mech(self).process)
self.auth_task = self.stream.loop.create_task(task)
self.responses = []
self.response_fut = Future()
def _handle_response(self, response):
# TODO: handle unexpected response
if not self.response_fut:
# TODO: send error?
return
self.responses.append(response['value'])
# wake up the thread, in case it's waiting for this
try:
self.response_fut.set_result()
except InvalidStateError:
# guess it wasn't waiting... it'll get to the
# queued response on its own, eventually
pass
def _abort_auth(self):
if self.auth_task:
self.bind_func = None
# auth_task and response_fut run in different threads,
# so have to cancel both to avoid stuck threads
self.auth_task.cancel()
if self.response_fut:
self.response_fut.cancel()
self.responses = None
self.response_fut = None
self.stream.send_thaw()
self.auth_task = None
def _handle_abort(self, abort):
self._abort_auth()
reply = auth_stanza.Failure()
reply['condition'] = 'aborted'
self.stream.send(reply)
async def _bind_attempt(self):
# If there's a resource conflict, force a new resource ID.
while not await self.stream.session_hook.bind(self.stream):
resource = await self.generate_resource_id()
self.stream.boundjid.resource = resource
async def _bind_success(self):
jid = self.stream.boundjid.full
self.stream.update_logger({'jid': jid})
self.stream.logger.info('Bound to %s', jid)
self.stream.session_bind_event.set()
await self.stream.bind()
self.stream.event('session_bind', self.stream.boundjid)
self.stream.event('session_start')
async def _bind_task(self, bind):
self.bind_func = None
resource = bind['bind']['resource']
if resource == '':
resource = await self.generate_resource_id()
self.stream.boundjid.resource = resource
try:
await self._bind_attempt()
except Exception as e:
bind.exception(e)
return
reply = bind.reply()
reply['bind']['jid'] = self.stream.boundjid.full
reply.send()
await self._bind_success()
def _handle_bind(self, bind):
if self.stream.session_bind_event.is_set() or \
self.bind_func:
# already bound
# TODO: send error?
return
if 'mechanisms' not in self.stream.features and \
not self.auth_task:
# not authenticated yet
# TODO: send error?
return
# If authentication is not complete yet, then this must
# be a pipelined request, and should be held until after
# authentication. Otherwise, schedule it now.
self.bind_func = self._bind_task(bind)
if not self.auth_task:
self.stream.loop.create_task(self.bind_func)
def _handle_session(self, session):
# RFC 3921 session creation is obsolete,
# so return success but otherwise do nothing
session.reply().send()
async def _legacy_auth_get(self, iq):
reply = iq.reply(clear=False)
auth = reply['auth']
auth.clear()
auth._set_sub_text('username', keep=True)
if not settings.ALLOW_WEBUSER_LOGIN:
auth._set_sub_text('password', keep=True)
auth._set_sub_text('resource', keep=True)
reply.send()
async def _legacy_auth_task(self, iq, process):
try:
ret = process(iq)
if iscoroutine(ret):
await ret
await self._bind_attempt()
except Exception as e:
self.stream.logger.info('Authentication failure')
reply = iq.reply()
reply['type'] = 'error'
if isinstance(e, XMPPError):
reply['error']['condition'] = e.condition
else:
reply['error']['condition'] = 'internal-server-error'
self.stream.logger.exception(
'Unhandled authentication exception')
reply.send()
else:
iq.reply().send()
await self._auth_success()
await self._bind_success()
self.auth_task = None
def _handle_legacy_auth(self, iq): # XEP-0078
if 'mechanisms' in self.stream.features or self.auth_task:
# already authenticated, or in progress
# TODO: send error?
return
type = iq['type']
auth = iq['auth']
if type == 'get':
task = self._legacy_auth_get(auth)
self.stream.loop.create_task(task)
elif type == 'set':
process = LegacyAuth(self).process
task = self._legacy_auth_task(auth, process)
self.auth_task = self.stream.loop.create_task(task)
else:
iq.unhandled()
def test_futures(self):
f = Future()
self.assertEqual(f.done(), False)
self.assertEqual(f.running(), False)
self.assertTrue(f.cancel())
self.assertTrue(f.cancelled())
with self.assertRaises(CancelledError):
f.result()
with self.assertRaises(CancelledError):
f.exception()
f = Future()
f.set_running_or_notify_cancel()
with self.assertRaises(TimeoutError):
f.result(0.1)
with self.assertRaises(TimeoutError):
f.exception(0.1)
f = Future()
f.set_running_or_notify_cancel()
f.set_result("result")
self.assertEqual(f.result(), "result")
self.assertEqual(f.exception(), None)
f = Future()
f.set_running_or_notify_cancel()
f.set_exception(Exception("foo"))
with self.assertRaises(Exception):
f.result()
class Ref():
def __init__(self, ref):
self.ref = ref
def set(self, ref):
self.ref = ref
# Test that done callbacks are called.
called = Ref(False)
f = Future()
f.add_done_callback(lambda f: called.set(True))
f.set_result(None)
self.assertTrue(called.ref)
# Test that callbacks are called when cancelled.
called = Ref(False)
f = Future()
f.add_done_callback(lambda f: called.set(True))
f.cancel()
self.assertTrue(called.ref)
# Test that callbacks are called immediately when the future is
# already done.
called = Ref(False)
f = Future()
f.set_result(None)
f.add_done_callback(lambda f: called.set(True))
self.assertTrue(called.ref)
count = Ref(0)
f = Future()
f.add_done_callback(lambda f: count.set(count.ref + 1))
f.add_done_callback(lambda f: count.set(count.ref + 1))
f.set_result(None)
self.assertEqual(count.ref, 2)
# Test that the callbacks are called with the future as argument.
done_future = Ref(None)
f = Future()
f.add_done_callback(lambda f: done_future.set(f))
f.set_result(None)
self.assertIs(f, done_future.ref)