def test_wrap_future_cancel(self):
f1 = concurrent.futures.Future()
f2 = asyncio.wrap_future(f1, loop=self.loop)
f2.cancel()
test_utils.run_briefly(self.loop)
self.assertTrue(f1.cancelled())
self.assertTrue(f2.cancelled())
def maybe_future(obj):
"""Return an asyncio Future
Use instead of gen.maybe_future
For our compatibility, this must accept:
- asyncio coroutine (gen.maybe_future doesn't work in tornado < 5)
- tornado coroutine (asyncio.ensure_future doesn't work)
- scalar (asyncio.ensure_future doesn't work)
- concurrent.futures.Future (asyncio.ensure_future doesn't work)
- tornado Future (works both ways)
- asyncio Future (works both ways)
"""
if inspect.isawaitable(obj):
# already awaitable, use ensure_future
return asyncio.ensure_future(obj)
elif isinstance(obj, concurrent.futures.Future):
return asyncio.wrap_future(obj)
else:
# could also check for tornado.concurrent.Future
# but with tornado >= 5 tornado.Future is asyncio.Future
f = asyncio.Future()
f.set_result(obj)
return f
def run_in_executor(self, executor, callback, *args):
"""Run callback in executor.
If no executor is provided, the default executor will be used, which defers execution to
a background thread.
"""
self._logger.debug('Running callback {} with args {} in executor'.format(callback, args))
if isinstance(callback, asyncio.Handle):
assert not args
assert not isinstance(callback, asyncio.TimerHandle)
if callback.cancelled:
f = asyncio.Future()
f.set_result(None)
return f
callback, args = callback.callback, callback.args
if executor is None:
self._logger.debug('Using default executor')
executor = self.__default_executor
if executor is None:
self._logger.debug('Creating default executor')
executor = self.__default_executor = QThreadExecutor()
return asyncio.wrap_future(executor.submit(callback, *args))
def run_in_executor(self, executor, func, *args): """ Arrange for a func to be called in the specified executor. The executor argument should be an Executor instance. The default executor is used if executor is None. Use functools.partial to pass keywords to the *func*. @param executor: executor @type executor: concurrent.futures.Executor or None @param func: a function to call @type func: callable @return: a Future @rtype: asyncio.Future (or compatible) """ if executor is None: executor = self._default_executor if executor is None: executor = ForkExecutor(loop=self) self._default_executor = executor future = executor.submit(func, *args) if _real_asyncio is not None: future = _real_asyncio.wrap_future(future, loop=self._asyncio_wrapper) return future
def test_wrap_future_use_global_loop(self, m_events):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1)
self.assertIs(m_events.get_event_loop.return_value, f2._loop)
def get_configuration_async(self, params):
"""Calls `get_configuration` method but designed to use with coroutines
Args:
params(dict): ConfigurationParams from lsp specs
Returns:
asyncio.Future that can be awaited
"""
return asyncio.wrap_future(self.get_configuration(params, None))
def test_wrap_future_cancel2(self):
f1 = concurrent.futures.Future()
f2 = asyncio.wrap_future(f1, loop=self.loop)
f1.set_result(42)
f2.cancel()
test_utils.run_briefly(self.loop)
self.assertFalse(f1.cancelled())
self.assertEqual(f1.result(), 42)
self.assertTrue(f2.cancelled())
def test_wrap_future_use_global_loop(self):
with mock.patch('asyncio.futures.events') as events:
events.get_event_loop = lambda: self.loop
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1)
self.assertIs(self.loop, f2._loop)
def run_proc_cmd(self, cmd, *args):
"""Run a command in the p-roc thread and return a future."""
if self.debug:
self.debug_log("Calling P-Roc cmd: %s (%s)", cmd, args)
future = asyncio.wrap_future(
asyncio.run_coroutine_threadsafe(self.proc_process.run_command(cmd, *args), self.proc_process_instance),
loop=self.machine.clock.loop)
future.add_done_callback(self._done)
return future
def test_wrap_future_use_global_loop(self):
with mock.patch('asyncio.futures.events') as events:
events.get_event_loop = lambda: self.loop
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1)
self.assertIs(self.loop, f2._loop)
def test_future_wrap_future_cancel2(loop, run_briefly):
f1 = concurrent.futures.Future()
f2 = asyncio.wrap_future(f1, loop=loop)
f1.set_result(42)
f2.cancel()
run_briefly(loop)
assert not f1.cancelled()
assert f1.result() == 42
assert f2.cancelled()
def test_wrap_future_cancel2(self):
f1 = concurrent.futures.Future()
f2 = asyncio.wrap_future(f1, loop=self.loop)
f1.set_result(42)
f2.cancel()
test_utils.run_briefly(self.loop)
self.assertFalse(f1.cancelled())
self.assertEqual(f1.result(), 42)
self.assertTrue(f2.cancelled())
async def publish(self, message, routing_key='',
mandatory=False, immediate=False):
ch = self._channel._channel
fut = ch.send_BasicPublish(message, self.name, routing_key=routing_key,
mandatory=mandatory, immediate=immediate)
self._channel._transport.write(ch.data_to_send())
await self._channel._protocol.drain()
if fut is not None:
fut = asyncio.wrap_future(fut, loop=self._channel._protocol._loop)
return await fut
async def main(executor):
loop = asyncio.get_running_loop()
teken = []
for thread in range(THREADSC):
teken.append(
asyncio.wrap_future(
asyncio.run_coroutine_threadsafe(instance(thread), loop)))
while not teken[len(teken) - 1].done() or len(teken) == 0:
await asyncio.sleep(1)
print("waitforit")
async def run_in_executor(func, *, executor=None, loop=None):
executor = executor or ThreadPoolExecutor(max_workers=4)
loop = loop or asyncio.get_event_loop()
future = executor.submit(func)
future = asyncio.wrap_future(future)
result = await asyncio.wait_for(future, timeout=None, loop=loop)
return result
def test_future_wrap_future(self):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1, loop=self.loop)
res, ident = self.loop.run_until_complete(f2)
self.assertIsInstance(f2, asyncio.Future)
self.assertEqual(res, 'oi')
self.assertNotEqual(ident, threading.get_ident())
async def do_pause():
calc_node = self.runner.submit(test_processes.WaitProcess)
while calc_node.process_state != ProcessState.WAITING:
await asyncio.sleep(0.1)
self.assertFalse(calc_node.paused)
pause_future = controller.pause_process(calc_node.pk)
future = await with_timeout(asyncio.wrap_future(pause_future))
result = await self.wait_future(asyncio.wrap_future(future))
self.assertTrue(result)
self.assertTrue(calc_node.paused)
kill_message = 'Sorry, you have to go mate'
kill_future = controller.kill_process(calc_node.pk,
msg=kill_message)
future = await with_timeout(asyncio.wrap_future(kill_future))
result = await self.wait_future(asyncio.wrap_future(future))
self.assertTrue(result)
def submit_task(completeName, email_body):
"""
submit the task of writing html file
:param completeName:
:param email_body:
:return:
"""
with futures.ThreadPoolExecutor(max_workers=3) as executor:
job = executor.submit(write_files, completeName, email_body)
return (yield from asyncio.wrap_future(job))
async def async_run_in_loop(co, loop, cancel_connect=True):
our_loop = get_running_loop()
if loop == our_loop:
# shortcuts in same loop
fu = asyncio.ensure_future(co)
else:
fu = asyncio.wrap_future(asyncio.run_coroutine_threadsafe(co, loop=loop))
if not cancel_connect:
fu = asyncio.shield(fu)
return await fu
async def wait(self):
# await a future
future = asyncio.run_coroutine_threadsafe(super().wait(),
self._event_loop)
future = asyncio.wrap_future(future)
done, pending = await asyncio.wait({future})
if not done:
raise InternalError(
"Some internal asyncio error during waiting asyncio.Event.wait"
)
def kill(
self,
msg: Union[str,
None] = None) -> Union[bool, plumpy.futures.Future]:
"""
Kill the process and all the children calculations it called
:param msg: message
"""
self.node.logger.info(f'Request to kill Process<{self.node.pk}>')
had_been_terminated = self.has_terminated()
result = super().kill(msg)
# Only kill children if we could be killed ourselves
if result is not False and not had_been_terminated:
killing = []
for child in self.node.called:
if self.runner.controller is None:
self.logger.info(
'no controller available to kill child<%s>', child.pk)
continue
try:
result = self.runner.controller.kill_process(
child.pk, f'Killed by parent<{self.node.pk}>')
result = asyncio.wrap_future(
result) # type: ignore[arg-type]
if asyncio.isfuture(result):
killing.append(result)
except ConnectionClosed:
self.logger.info(
'no connection available to kill child<%s>', child.pk)
except UnroutableError:
self.logger.info(
'kill signal was unable to reach child<%s>', child.pk)
if asyncio.isfuture(result):
# We ourselves are waiting to be killed so add it to the list
killing.append(result) # type: ignore[arg-type]
if killing:
# We are waiting for things to be killed, so return the 'gathered' future
kill_future = plumpy.futures.gather(*killing)
result = self.loop.create_future()
def done(done_future: plumpy.futures.Future):
is_all_killed = all(done_future.result())
result.set_result(
is_all_killed) # type: ignore[union-attr]
kill_future.add_done_callback(done)
return result
def execute_fetchall(
self,
sql: str,
parameters: Iterable = None) -> Awaitable[Iterable[sqlite3.Row]]:
parameters = parameters if parameters is not None else []
def __fetchall(conn: sqlite3.Connection, *args, **kwargs):
return conn.execute(*args, **kwargs).fetchall()
return wrap_future(
self.executor.submit(__fetchall, self.connection, sql, parameters))
async def test_fetchall_prevents_sqlite_misuse(self):
# test that calling fetchall sufficiently avoids the race
attempts = 0
def executemany_fetchall(query, params):
self.db.executemany(query, params).fetchall()
while attempts < self.max_misuse_attempts:
f1 = asyncio.wrap_future(
self.loop.run_in_executor(
self.executor, executemany_fetchall,
"update test1 set val='derp' where id=?",
((str(i), ) for i in range(2))))
f2 = asyncio.wrap_future(
self.loop.run_in_executor(
self.executor, executemany_fetchall,
"update test2 set val='derp' where id=?",
((str(i), ) for i in range(2))))
attempts += 1
await asyncio.gather(f1, f2)
def future_to_aio_future(
f: AnyFuture, loop: asyncio.AbstractEventLoop
) -> asyncio.Future:
if isinstance(f, grpc.Future):
return future_to_aio_future(grpc_future_to_concurrent_future(f), loop)
elif isinstance(f, asyncio.Future):
return f
else:
# HACK: This method definitely supports a `loop` argument, but mypy
# doesn't think so.
return asyncio.wrap_future(f, loop=loop) # type: ignore
def register_capability_async(self, params: RegistrationParams) -> asyncio.Future:
"""Register a new capability on the client.
Args:
params(RegistrationParams): RegistrationParams from lsp specs
Returns:
asyncio.Future object that will be resolved once a
response has been received
"""
return asyncio.wrap_future(self.register_capability(params, None))
async def run(self):
while self._run:
try:
if await self._backend.poll():
job = await self._backend.recv(unpickle=self._unpickle)
self._log.debug("Received job: %s", job)
f = self._workers.route(job)
fut = asyncio.wrap_future(f)
await self._backend.send(await fut)
except asyncio.CancelledError:
pass
def _poll_events(self):
poll_sleep = 1 / self.machine.config['mpf']['default_platform_hz']
while True:
events = yield from asyncio.wrap_future(
asyncio.run_coroutine_threadsafe(self.proc_process.read_events_and_watchdog(poll_sleep),
self.proc_process_instance),
loop=self.machine.clock.loop)
if events:
self.process_events(events)
yield from asyncio.sleep(poll_sleep, loop=self.machine.clock.loop)
async def run(self):
# change format to GrayS with bitdepth 32 for descale
src = self.src[self.frame]
matrix_s = '709' if src.format.color_family == vapoursynth.RGB else None
src_luma32 = core.resize.Point(src, format=vapoursynth.YUV444PS, matrix_s=matrix_s)
src_luma32 = core.std.ShufflePlanes(src_luma32, 0, vapoursynth.GRAY)
src_luma32 = core.std.Cache(src_luma32)
# descale each individual frame
resizer = descale_approx if self.approx else descale_accurate
clip_list = []
for h in range(self.min_h, self.max_h + 1):
clip_list.append(resizer(src_luma32, self.getw(h), h, self.kernel, self.b, self.c, self.taps))
full_clip = core.std.Splice(clip_list, mismatch=True)
full_clip = upscale(full_clip, self.getw(src.height), src.height, self.kernel, self.b, self.c, self.taps)
if self.ar != src.width / src.height:
src_luma32 = upscale(src_luma32, self.getw(src.height), src.height, self.kernel, self.b, self.c, self.taps)
expr_full = core.std.Expr([src_luma32 * full_clip.num_frames, full_clip], 'x y - abs dup 0.015 > swap 0 ?')
full_clip = core.std.CropRel(expr_full, 5, 5, 5, 5)
full_clip = core.std.PlaneStats(full_clip)
full_clip = core.std.Cache(full_clip)
tasks_pending = set()
futures = {}
vals = []
full_clip_len = len(full_clip)
for frame_index in range(len(full_clip)):
print(f"{frame_index}/{full_clip_len}", end="\r")
fut = asyncio.ensure_future(asyncio.wrap_future(full_clip.get_frame_async(frame_index)))
tasks_pending.add(fut)
futures[fut] = frame_index
while len(tasks_pending) >= core.num_threads * (2 if self.approx else 1) + 2:
tasks_done, tasks_pending = await asyncio.wait(tasks_pending, return_when=asyncio.FIRST_COMPLETED)
vals += [(futures.pop(task), task.result().props.PlaneStatsAverage) for task in tasks_done]
tasks_done, _ = await asyncio.wait(tasks_pending)
vals += [(futures.pop(task), task.result().props.PlaneStatsAverage) for task in tasks_done]
vals = [v for _, v in sorted(vals)]
ratios, vals, best_value = self.analyze_results(vals)
if not os.path.isdir(output_dir):
os.mkdir(output_dir)
self.save_plot(vals)
if self.img_out:
self.save_images(src_luma32)
self.txt_output += 'Raw data:\nResolution\t | Relative Error\t | Relative difference from last\n'
for i, error in enumerate(vals):
self.txt_output += f'{i + self.min_h:4d}\t\t | {error:.10f}\t\t\t | {ratios[i]:.2f}\n'
with open(f"{output_dir}/{self.filename}.txt", "w") as file_open:
file_open.writelines(self.txt_output)
return best_value
def __init__(self, taskdef: TaskDefinition, cluster):
kwargs = taskdef.serialize()
super().__init__(**kwargs)
self.conn = None
self.nonce = 0
self.cluster = cluster
self.future = Future()
self.awaitable = asyncio.wrap_future(self.future)
self.status = WAIT
self.error = None
self.result = None
def show_document_async(self, params: ShowDocumentParams) -> asyncio.Future:
"""Display a particular document in the user interface.
Args:
params(ShowDocumentParams): ShowDocumentParams from lsp specs
Returns:
asyncio.Future object that will be resolved once a
response has been received
"""
return asyncio.wrap_future(self.show_document(params, None))
async def _subscriber(self, account_id, instruments=None):
cancelled = False
retry_count = 0
while instruments is None:
try:
self.debug("未指定订阅合约，主动请求账户[%s]的合约数据", account_id)
fut = self.api.qry_instruments(account_id=account_id,
block=False,
push=False)
async_fut = asyncio.wrap_future(fut)
rep = await async_fut
instruments = [inst.name for inst in rep.instruments]
except asyncio.CancelledError:
cancelled = True
break
except Exception as e:
self.api.on_error(e)
while self.is_running() and not cancelled:
connected = False
try:
url = (self.api.get_stream_host() + PRICE_STREAM_ENDPOINT +
"?instruments={instruments}").format(
accountID=account_id,
instruments="%2C".join(instruments),
)
async for data in fetch_stream(self.api.session, url):
if not connected:
retry_count = 0
connected = True
self.debug("账户[%s]Price信道订阅成功,订阅品种数为:%s", account_id,
len(instruments))
if not data:
continue
valid = self._on_tick(data.strip(MSG_SEP), account_id)
if not valid:
break
if not self.is_running():
break
except asyncio.CancelledError:
break
except (asyncio.TimeoutError,
concurrent.futures._base.TimeoutError):
pass #TODO: continue without reconnect?
except Exception as e:
self.api.on_error(e)
try:
retry_count += 1
retry = 1 << (min(retry_count, 4) - 1)
self.debug("账户[%s]Price信道断开,%s秒后进行第%s次重连", account_id, retry,
retry_count)
await asyncio.sleep(retry)
except asyncio.CancelledError:
break
self.debug("账户[%s]Price信道的订阅已被取消", account_id)
def test_future_wrap_future(self):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1, loop=self.loop)
res, ident = self.loop.run_until_complete(f2)
self.assertIsInstance(f2, asyncio.Future)
self.assertEqual(res, 'oi')
self.assertNotEqual(ident, threading.get_ident())
def test_future_wrap_future(loop):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1, loop=loop)
res, ident = loop.run_until_complete(f2)
assert asyncio.isfuture(f2)
assert res == 'oi'
assert ident != threading.get_ident()
async def _run_function_async(self, coro, interface):
coro = wrap_coro_exception(coro)
coro = self._wrap_check_async_leakage(coro)
current_loop = self._get_running_loop()
loop = self._get_loop(start=True)
if loop == current_loop:
value = await coro
else:
c_fut = asyncio.run_coroutine_threadsafe(coro, loop)
a_fut = asyncio.wrap_future(c_fut)
value = await a_fut
return self._translate_out(value, interface)
async def _get_pods(self):
"""Get information about build and user pods"""
app_log.info("Getting pod statistics")
k8s = self.settings["kubernetes_client"]
pool = self.settings["executor"]
get_user_pods = asyncio.wrap_future(
pool.submit(
k8s.list_namespaced_pod,
self.settings["build_namespace"],
label_selector="app=jupyterhub,component=singleuser-server",
))
get_build_pods = asyncio.wrap_future(
pool.submit(
k8s.list_namespaced_pod,
self.settings["build_namespace"],
label_selector="component=binderhub-build",
))
return await asyncio.gather(get_user_pods, get_build_pods)
def test_wrap_future(self):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1, loop=self.loop)
res, ident = self.loop.run_until_complete(f2)
self.assertTrue(asyncio.isfuture(f2))
self.assertEqual(res, 'oi')
self.assertNotEqual(ident, threading.get_ident())
ex.shutdown(wait=True)
def get_chunk(self) -> Awaitable[bytes]:
with self._chunk_lock:
future: Future[bytes] = Future()
# TODO: update backpressure window
if self._received_chunks:
chunk = self._received_chunks.pop(0)
future.set_result(chunk)
elif self._stream.completion_future.done():
future.set_result(b"")
else:
self._chunk_futures.append(future)
return asyncio.wrap_future(future)
def test_wrap_future(self):
def run(arg):
return (arg, threading.get_ident())
ex = concurrent.futures.ThreadPoolExecutor(1)
f1 = ex.submit(run, 'oi')
f2 = asyncio.wrap_future(f1, loop=self.loop)
res, ident = self.loop.run_until_complete(f2)
self.assertTrue(asyncio.isfuture(f2))
self.assertEqual(res, 'oi')
self.assertNotEqual(ident, threading.get_ident())
ex.shutdown(wait=True)
def unregister_capability_async(self, params: UnregistrationParams) -> asyncio.Future:
"""Unregister a new capability on the client.
Args:
params(UnregistrationParams): UnregistrationParams from lsp specs
callback(callable): Callabe which will be called after
response from the client is received
Returns:
asyncio.Future object that will be resolved once a
response has been received
"""
return asyncio.wrap_future(self.unregister_capability(params, None))
def send_request_async(self, method, params=None):
"""Calls `send_request` and wraps `concurrent.futures.Future` with
`asyncio.Future` so it can be used with `await` keyword.
Args:
method(str): The method name of the message to send
params(any): The payload of the message
Returns:
`asyncio.Future` that can be awaited
"""
return asyncio.wrap_future(self.send_request(method, params))
async def evieecutor(func, executor=None, loop=None, *args, **kwargs):
if not executor:
executor = concurrent.futures.ThreadPoolExecutor(max_workers=4)
future = executor.submit(func, *args, **kwargs)
future = asyncio.wrap_future(future)
result = await asyncio.wait_for(future,
timeout=None,
loop=loop or asyncio.get_event_loop())
executor.shutdown(wait=False)
return result
def shutdown(self):
"""
Shut down the proxy. This method is thread-safe.
"""
if not self.should_exit.is_set():
self.should_exit.set()
ret = asyncio.run_coroutine_threadsafe(self._shutdown(), loop=self.channel.loop)
# Weird band-aid to make sure that self._shutdown() is actually executed,
# which otherwise hangs the process as the proxy server is threaded.
# This all needs to be simplified when the proxy server runs on asyncio as well.
if not self.channel.loop.is_running(): # pragma: no cover
try:
self.channel.loop.run_until_complete(asyncio.wrap_future(ret))
except RuntimeError:
pass # Event loop stopped before Future completed.
def maybe_future(obj):
"""Like tornado's deprecated gen.maybe_future
but more compatible with asyncio for recent versions
of tornado
"""
if inspect.isawaitable(obj):
return asyncio.ensure_future(obj)
elif isinstance(obj, concurrent.futures.Future):
return asyncio.wrap_future(obj)
else:
# not awaitable, wrap scalar in future
f = asyncio.Future()
f.set_result(obj)
return f
def maybe_future(obj):
"""Return an asyncio Future
Use instead of gen.maybe_future
For our compatibility, this must accept:
- asyncio coroutine (gen.maybe_future doesn't work in tornado < 5)
- tornado coroutine (asyncio.ensure_future doesn't work)
- scalar (asyncio.ensure_future doesn't work)
- concurrent.futures.Future (asyncio.ensure_future doesn't work)
- tornado Future (works both ways)
- asyncio Future (works both ways)
"""
if inspect.isawaitable(obj):
# already awaitable, use ensure_future
return asyncio.ensure_future(obj)
elif isinstance(obj, concurrent.futures.Future):
return asyncio.wrap_future(obj)
else:
return to_asyncio_future(gen.maybe_future(obj))
async def put(self, item):
while True:
fut = self._put(item)
if not fut:
break
await asyncio.wait_for(asyncio.wrap_future(fut), None)
def __getattr__(self, name):
requests_method = getattr(requests, name)
return lambda *args, **kwargs: asyncio.wrap_future(
self.executor.submit(requests_method, *args, **kwargs)
)
def test_wrap_future_future(self):
f1 = asyncio.Future(loop=self.loop)
f2 = asyncio.wrap_future(f1)
self.assertIs(f1, f2)
def test_future_wrap_future_future(self):
f1 = self.create_future()
f2 = asyncio.wrap_future(f1)
self.assertIs(f1, f2)
def run(self, fn, *args, **kwargs):
return asyncio.wrap_future(self.executor.submit(fn, *args, **kwargs))
def __init__(self):
self.executor = ThreadPoolExecutor(1)
real_submit = self.executor.submit
self.executor.submit = lambda *args, **kwargs: asyncio.wrap_future(
real_submit(*args, **kwargs)
)
async def get(self):
item, fut = self._get()
if fut:
await asyncio.wait_for(asyncio.wrap_future(fut), None)
item = fut.result()
return item
def test_wrap_future(self):
f = DuckFuture()
g = asyncio.wrap_future(f)
assert g is f
