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from __future__ import annotations
import pickle
from datetime import timedelta
from distributed import Event
from distributed.utils_test import gen_cluster
@gen_cluster(client=True, nthreads=[("127.0.0.1", 8)] * 2)
async def test_event_on_workers(c, s, a, b):
# Test the "typical" use case of events:
# workers set, clear and wait for it
def wait_for_it_failing(x):
event = Event("x")
# Event is not set in another task so far
assert not event.wait(timeout=0.05)
assert not event.is_set()
def wait_for_it_ok(x):
event = Event("x")
# Event is set in another task
assert event.wait(timeout=0.5)
assert event.is_set()
def set_it():
event = Event("x")
event.set()
def clear_it():
event = Event("x")
event.clear()
wait_futures = c.map(wait_for_it_failing, range(10))
await c.gather(wait_futures)
set_future = c.submit(set_it)
await c.gather(set_future)
wait_futures = c.map(wait_for_it_ok, range(10))
await c.gather(wait_futures)
clear_future = c.submit(clear_it)
await c.gather(clear_future)
wait_futures = c.map(wait_for_it_ok, range(10))
await c.gather(wait_futures)
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
@gen_cluster(client=True)
async def test_default_event(c, s, a, b):
# The default flag for events should be false
event = Event("x")
assert not await event.is_set()
await event.clear()
# Cleanup should have happened
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
@gen_cluster(client=True)
async def test_set_not_set(c, s, a, b):
# Set and unset the event and check if the flag is
# propagated correctly
event = Event("x")
await event.clear()
assert not await event.is_set()
await event.set()
assert await event.is_set()
await event.set()
assert await event.is_set()
await event.clear()
assert not await event.is_set()
# Cleanup should have happened
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
@gen_cluster(client=True)
async def test_set_not_set_many_events(c, s, a, b):
# Set and unset the event and check if the flag is
# propagated correctly with many events
events = [Event(name) for name in range(100)]
for event in events:
await event.clear()
assert not await event.is_set()
for i, event in enumerate(events):
if i % 2 == 0:
await event.set()
assert await event.is_set()
else:
assert not await event.is_set()
for event in events:
await event.clear()
assert not await event.is_set()
# Cleanup should have happened
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
@gen_cluster(client=True)
async def test_timeout(c, s, a, b):
# The event should not be set and the timeout should happen
event = Event("x")
assert not await Event("x").wait(timeout=0.1)
await event.set()
assert await Event("x").wait(timeout="100ms")
await event.clear()
assert not await Event("x").wait(timeout=timedelta(seconds=0.1))
def test_event_sync(client):
# Assert that we call the client.sync correctly
def wait_for_it_failing(x):
event = Event("x")
# Event is not set in another task so far
assert not event.wait(timeout=0.05)
assert not event.is_set()
def wait_for_it_ok(x):
event = Event("x")
# Event is set in another task
assert event.wait(timeout=0.5)
assert event.is_set()
def set_it():
event = Event("x")
event.set()
wait_futures = client.map(wait_for_it_failing, range(10))
client.gather(wait_futures)
set_future = client.submit(set_it)
client.gather(set_future)
wait_futures = client.map(wait_for_it_ok, range(10))
client.gather(wait_futures)
@gen_cluster(client=True)
async def test_event_types(c, s, a, b):
# Event names could be strings, numbers or tuples
for name in [1, ("a", 1), ["a", 1], b"123", "123"]:
event = Event(name)
assert event.name == name
await event.set()
await event.clear()
result = await event.is_set()
assert not result
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
@gen_cluster(client=True)
async def test_serializable(c, s, a, b):
# Pickling an event should work properly
def f(x, event=None):
assert event.name == "x"
return x + 1
event = Event("x")
futures = c.map(f, range(10), event=event)
await c.gather(futures)
event2 = pickle.loads(pickle.dumps(event))
assert event2.name == event.name
assert event2.client is event.client
@gen_cluster(client=True)
async def test_two_events_on_workers(c, s, a, b):
# Longer test with multiple events and two workers
def event_not_set(event_name):
assert not Event(event_name).wait(timeout=0.05)
def event_is_set(event_name):
assert Event(event_name).wait(timeout=0.5)
await c.gather(c.submit(event_not_set, "first_event"))
await c.gather(c.submit(event_not_set, "second_event"))
await Event("first_event").set()
await c.gather(c.submit(event_is_set, "first_event"))
await c.gather(c.submit(event_not_set, "second_event"))
await Event("first_event").clear()
await Event("second_event").set()
await c.gather(c.submit(event_not_set, "first_event"))
await c.gather(c.submit(event_is_set, "second_event"))
await Event("first_event").clear()
await Event("second_event").clear()
await c.gather(c.submit(event_not_set, "first_event"))
await c.gather(c.submit(event_not_set, "second_event"))
assert not s.extensions["events"]._events
assert not s.extensions["events"]._waiter_count
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