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from __future__ import annotations
import asyncio
from unittest import mock
import pytest
from dask.optimization import SubgraphCallable
from distributed.core import ConnectionPool
from distributed.utils_comm import (
WrappedKey,
gather_from_workers,
pack_data,
retry,
subs_multiple,
unpack_remotedata,
)
from distributed.utils_test import BrokenComm, gen_cluster
def test_pack_data():
data = {"x": 1}
assert pack_data(("x", "y"), data) == (1, "y")
assert pack_data({"a": "x", "b": "y"}, data) == {"a": 1, "b": "y"}
assert pack_data({"a": ["x"], "b": "y"}, data) == {"a": [1], "b": "y"}
def test_subs_multiple():
data = {"x": 1, "y": 2}
assert subs_multiple((sum, [0, "x", "y", "z"]), data) == (sum, [0, 1, 2, "z"])
assert subs_multiple((sum, [0, ["x", "y", "z"]]), data) == (sum, [0, [1, 2, "z"]])
dsk = {"a": (sum, ["x", "y"])}
assert subs_multiple(dsk, data) == {"a": (sum, [1, 2])}
# Tuple key
data = {"x": 1, ("y", 0): 2}
dsk = {"a": (sum, ["x", ("y", 0)])}
assert subs_multiple(dsk, data) == {"a": (sum, [1, 2])}
@gen_cluster(client=True)
async def test_gather_from_workers_permissive(c, s, a, b):
rpc = await ConnectionPool()
x = await c.scatter({"x": 1}, workers=a.address)
data, missing, bad_workers = await gather_from_workers(
{"x": [a.address], "y": [b.address]}, rpc=rpc
)
assert data == {"x": 1}
assert list(missing) == ["y"]
class BrokenConnectionPool(ConnectionPool):
async def connect(self, *args, **kwargs):
return BrokenComm()
@gen_cluster(client=True)
async def test_gather_from_workers_permissive_flaky(c, s, a, b):
x = await c.scatter({"x": 1}, workers=a.address)
rpc = await BrokenConnectionPool()
data, missing, bad_workers = await gather_from_workers({"x": [a.address]}, rpc=rpc)
assert missing == {"x": [a.address]}
assert bad_workers == [a.address]
def test_retry_no_exception(cleanup):
n_calls = 0
retval = object()
async def coro():
nonlocal n_calls
n_calls += 1
return retval
async def f():
return await retry(coro, count=0, delay_min=-1, delay_max=-1)
assert asyncio.run(f()) is retval
assert n_calls == 1
def test_retry0_raises_immediately(cleanup):
# test that using max_reties=0 raises after 1 call
n_calls = 0
async def coro():
nonlocal n_calls
n_calls += 1
raise RuntimeError(f"RT_ERROR {n_calls}")
async def f():
return await retry(coro, count=0, delay_min=-1, delay_max=-1)
with pytest.raises(RuntimeError, match="RT_ERROR 1"):
asyncio.run(f())
assert n_calls == 1
def test_retry_does_retry_and_sleep(cleanup):
# test the retry and sleep pattern of `retry`
n_calls = 0
class MyEx(Exception):
pass
async def coro():
nonlocal n_calls
n_calls += 1
raise MyEx(f"RT_ERROR {n_calls}")
sleep_calls = []
async def my_sleep(amount):
sleep_calls.append(amount)
return
async def f():
return await retry(
coro,
retry_on_exceptions=(MyEx,),
count=5,
delay_min=1.0,
delay_max=6.0,
jitter_fraction=0.0,
)
with mock.patch("asyncio.sleep", my_sleep):
with pytest.raises(MyEx, match="RT_ERROR 6"):
asyncio.run(f())
assert n_calls == 6
assert sleep_calls == [0.0, 1.0, 3.0, 6.0, 6.0]
def test_unpack_remotedata():
def assert_eq(keys1: set[WrappedKey], keys2: set[WrappedKey]) -> None:
if len(keys1) != len(keys2):
assert False
if not keys1:
assert True
if not all(isinstance(k, WrappedKey) for k in keys1 & keys2):
assert False
assert sorted([k.key for k in keys1]) == sorted([k.key for k in keys2])
assert unpack_remotedata(1) == (1, set())
assert unpack_remotedata(()) == ((), set())
res, keys = unpack_remotedata(WrappedKey("mykey"))
assert res == "mykey"
assert_eq(keys, {WrappedKey("mykey")})
# Check unpack of SC that contains a wrapped key
sc = SubgraphCallable({"key": (WrappedKey("data"),)}, outkey="key", inkeys=["arg1"])
dsk = (sc, "arg1")
res, keys = unpack_remotedata(dsk)
assert res[0] != sc # Notice, the first item (the SC) has been changed
assert res[1:] == ("arg1", "data")
assert_eq(keys, {WrappedKey("data")})
# Check unpack of SC when it takes a wrapped key as argument
sc = SubgraphCallable({"key": ("arg1",)}, outkey="key", inkeys=[WrappedKey("arg1")])
dsk = (sc, "arg1")
res, keys = unpack_remotedata(dsk)
assert res == (sc, "arg1") # Notice, the first item (the SC) has NOT been changed
assert_eq(keys, set())
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