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from __future__ import annotations
import asyncio
from datetime import timedelta
from time import sleep
import pytest
import tlz as toolz
from distributed import Pub, Sub, TimeoutError, get_worker, wait
from distributed.metrics import time
from distributed.utils_test import gen_cluster
@gen_cluster(client=True)
async def test_speed(c, s, a, b):
"""
This tests how quickly we can move messages back and forth
This is mostly a test of latency.
Interestingly this runs 10x slower on Python 2
"""
def pingpong(a, b, start=False, n=1000, msg=1):
sub = Sub(a)
pub = Pub(b)
while not pub.subscribers:
sleep(0.01)
if start:
pub.put(msg) # other sub may not have started yet
for _ in range(n):
msg = next(sub)
pub.put(msg)
# if i % 100 == 0:
# print(a, b, i)
return n
np = pytest.importorskip("numpy")
x = np.random.random(1000)
x = c.submit(pingpong, "a", "b", start=True, msg=x, n=100)
y = c.submit(pingpong, "b", "a", n=100)
start = time()
await c.gather([x, y])
stop = time()
# print('duration', stop - start) # I get around 3ms/roundtrip on my laptop
@gen_cluster(client=True, nthreads=[])
async def test_client(c, s):
with pytest.raises(Exception):
get_worker()
sub = Sub("a")
pub = Pub("a")
sps = s.extensions["pubsub"]
cps = c.extensions["pubsub"]
start = time()
while not set(sps.client_subscribers["a"]) == {c.id}:
await asyncio.sleep(0.01)
assert time() < start + 3
pub.put(123)
result = await sub.__anext__()
assert result == 123
@gen_cluster(client=True)
async def test_client_worker(c, s, a, b):
sub = Sub("a", client=c, worker=None)
def f(x):
pub = Pub("a")
pub.put(x)
futures = c.map(f, range(10))
await wait(futures)
L = []
for _ in range(10):
result = await sub.get()
L.append(result)
assert set(L) == set(range(10))
sps = s.extensions["pubsub"]
aps = a.extensions["pubsub"]
bps = b.extensions["pubsub"]
start = time()
while (
sps.publishers["a"]
or sps.subscribers["a"]
or aps.publishers["a"]
or bps.publishers["a"]
or len(sps.client_subscribers["a"]) != 1
):
await asyncio.sleep(0.01)
assert time() < start + 3
del sub
start = time()
while (
sps.client_subscribers
or any(aps.publish_to_scheduler.values())
or any(bps.publish_to_scheduler.values())
):
await asyncio.sleep(0.01)
assert time() < start + 3
@gen_cluster(client=True)
async def test_timeouts(c, s, a, b):
sub = Sub("a", client=c, worker=None)
start = time()
with pytest.raises(TimeoutError):
await sub.get(timeout="100ms")
stop = time()
assert stop - start < 1
with pytest.raises(TimeoutError):
await sub.get(timeout=timedelta(milliseconds=10))
@gen_cluster(client=True)
async def test_repr(c, s, a, b):
pub = Pub("my-topic")
sub = Sub("my-topic")
assert "my-topic" in str(pub)
assert "Pub" in str(pub)
assert "my-topic" in str(sub)
assert "Sub" in str(sub)
@pytest.mark.xfail(reason="flaky and re-fails on reruns; out of order execution")
@gen_cluster(client=True)
async def test_basic(c, s, a, b):
async def publish():
pub = Pub("a")
i = 0
while True:
await asyncio.sleep(0.01)
pub._put(i)
i += 1
def f(_):
sub = Sub("a")
return list(toolz.take(5, sub))
asyncio.ensure_future(c.run(publish, workers=[a.address]))
tasks = [c.submit(f, i) for i in range(4)]
results = await c.gather(tasks)
for r in results:
x = r[0]
# race conditions and unintended (but correct) messages
# can make this test not true
# assert r == [x, x + 1, x + 2, x + 3, x + 4]
assert len(r) == 5
assert all(r[i] < r[i + 1] for i in range(0, 4)), r
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