/
utils_test.py
1724 lines (1390 loc) · 48.1 KB
/
utils_test.py
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from __future__ import annotations
import asyncio
import copy
import functools
import gc
import inspect
import io
import logging
import logging.config
import os
import queue
import re
import shutil
import signal
import socket
import subprocess
import sys
import tempfile
import threading
import uuid
import warnings
import weakref
from collections import defaultdict
from collections.abc import Callable
from contextlib import contextmanager, nullcontext, suppress
from glob import glob
from itertools import count
from time import sleep
from typing import Any
from distributed.scheduler import Scheduler
try:
import ssl
except ImportError:
ssl = None # type: ignore
import pytest
from tlz import assoc, memoize, merge
from tornado import gen
from tornado.ioloop import IOLoop
import dask
from distributed.comm.tcp import TCP
from . import system
from .client import Client, _global_clients, default_client
from .comm import Comm
from .compatibility import WINDOWS
from .config import initialize_logging
from .core import CommClosedError, ConnectionPool, Status, connect, rpc
from .deploy import SpecCluster
from .diagnostics.plugin import WorkerPlugin
from .metrics import time
from .nanny import Nanny
from .node import ServerNode
from .proctitle import enable_proctitle_on_children
from .security import Security
from .utils import (
DequeHandler,
TimeoutError,
_offload_executor,
get_ip,
get_ipv6,
iscoroutinefunction,
log_errors,
mp_context,
reset_logger_locks,
sync,
thread_state,
)
from .worker import RUNNING, Worker
try:
import dask.array # register config
except ImportError:
pass
logger = logging.getLogger(__name__)
logging_levels = {
name: logger.level
for name, logger in logging.root.manager.loggerDict.items()
if isinstance(logger, logging.Logger)
}
_TEST_TIMEOUT = 30
_offload_executor.submit(lambda: None).result() # create thread during import
@pytest.fixture(scope="session")
def valid_python_script(tmpdir_factory):
local_file = tmpdir_factory.mktemp("data").join("file.py")
local_file.write("print('hello world!')")
return local_file
@pytest.fixture(scope="session")
def client_contract_script(tmpdir_factory):
local_file = tmpdir_factory.mktemp("data").join("distributed_script.py")
lines = (
"from distributed import Client",
"e = Client('127.0.0.1:8989')",
"print(e)",
)
local_file.write("\n".join(lines))
return local_file
@pytest.fixture(scope="session")
def invalid_python_script(tmpdir_factory):
local_file = tmpdir_factory.mktemp("data").join("file.py")
local_file.write("a+1")
return local_file
async def cleanup_global_workers():
for worker in Worker._instances:
await worker.close(report=False, executor_wait=False)
@pytest.fixture
def loop():
with check_instances():
with pristine_loop() as loop:
# Monkey-patch IOLoop.start to wait for loop stop
orig_start = loop.start
is_stopped = threading.Event()
is_stopped.set()
def start():
is_stopped.clear()
try:
orig_start()
finally:
is_stopped.set()
loop.start = start
yield loop
# Stop the loop in case it's still running
try:
sync(loop, cleanup_global_workers, callback_timeout=0.500)
loop.add_callback(loop.stop)
except RuntimeError as e:
if not re.match("IOLoop is clos(ed|ing)", str(e)):
raise
except TimeoutError:
pass
else:
is_stopped.wait()
@pytest.fixture
def loop_in_thread():
with pristine_loop() as loop:
thread = threading.Thread(target=loop.start, name="test IOLoop")
thread.daemon = True
thread.start()
loop_started = threading.Event()
loop.add_callback(loop_started.set)
loop_started.wait()
yield loop
loop.add_callback(loop.stop)
thread.join(timeout=5)
@pytest.fixture
def zmq_ctx():
import zmq
ctx = zmq.Context.instance()
yield ctx
ctx.destroy(linger=0)
@contextmanager
def pristine_loop():
IOLoop.clear_instance()
IOLoop.clear_current()
loop = IOLoop()
loop.make_current()
assert IOLoop.current() is loop
try:
yield loop
finally:
try:
loop.close(all_fds=True)
except (KeyError, ValueError):
pass
IOLoop.clear_instance()
IOLoop.clear_current()
@contextmanager
def mock_ipython():
from unittest import mock
from distributed._ipython_utils import remote_magic
ip = mock.Mock()
ip.user_ns = {}
ip.kernel = None
def get_ip():
return ip
with mock.patch("IPython.get_ipython", get_ip), mock.patch(
"distributed._ipython_utils.get_ipython", get_ip
):
yield ip
# cleanup remote_magic client cache
for kc in remote_magic._clients.values():
kc.stop_channels()
remote_magic._clients.clear()
original_config = copy.deepcopy(dask.config.config)
def reset_config():
dask.config.config.clear()
dask.config.config.update(copy.deepcopy(original_config))
def nodebug(func):
"""
A decorator to disable debug facilities during timing-sensitive tests.
Warning: this doesn't affect already created IOLoops.
"""
@functools.wraps(func)
def wrapped(*args, **kwargs):
old_asyncio_debug = os.environ.get("PYTHONASYNCIODEBUG")
if old_asyncio_debug is not None:
del os.environ["PYTHONASYNCIODEBUG"]
try:
return func(*args, **kwargs)
finally:
if old_asyncio_debug is not None:
os.environ["PYTHONASYNCIODEBUG"] = old_asyncio_debug
return wrapped
def nodebug_setup_module(module):
"""
A setup_module() that you can install in a test module to disable
debug facilities.
"""
module._old_asyncio_debug = os.environ.get("PYTHONASYNCIODEBUG")
if module._old_asyncio_debug is not None:
del os.environ["PYTHONASYNCIODEBUG"]
def nodebug_teardown_module(module):
"""
A teardown_module() that you can install in a test module to reenable
debug facilities.
"""
if module._old_asyncio_debug is not None:
os.environ["PYTHONASYNCIODEBUG"] = module._old_asyncio_debug
def inc(x):
return x + 1
def dec(x):
return x - 1
def mul(x, y):
return x * y
def div(x, y):
return x / y
def deep(n):
if n > 0:
return deep(n - 1)
else:
return True
def throws(x):
raise RuntimeError("hello!")
def double(x):
return x * 2
def slowinc(x, delay=0.02):
sleep(delay)
return x + 1
def slowdec(x, delay=0.02):
sleep(delay)
return x - 1
def slowdouble(x, delay=0.02):
sleep(delay)
return 2 * x
def randominc(x, scale=1):
from random import random
sleep(random() * scale)
return x + 1
def slowadd(x, y, delay=0.02):
sleep(delay)
return x + y
def slowsum(seq, delay=0.02):
sleep(delay)
return sum(seq)
def slowidentity(*args, **kwargs):
delay = kwargs.get("delay", 0.02)
sleep(delay)
if len(args) == 1:
return args[0]
else:
return args
class _UnhashableCallable:
# FIXME https://github.com/python/mypy/issues/4266
__hash__ = None # type: ignore
def __call__(self, x):
return x + 1
def run_for(duration, timer=time):
"""
Burn CPU for *duration* seconds.
"""
deadline = timer() + duration
while timer() <= deadline:
pass
# This dict grows at every varying() invocation
_varying_dict: defaultdict[str, int] = defaultdict(int)
_varying_key_gen = count()
class _ModuleSlot:
def __init__(self, modname, slotname):
self.modname = modname
self.slotname = slotname
def get(self):
return getattr(sys.modules[self.modname], self.slotname)
def varying(items):
"""
Return a function that returns a result (or raises an exception)
from *items* at each call.
"""
# cloudpickle would serialize the *values* of all globals
# used by *func* below, so we can't use `global <something>`.
# Instead look up the module by name to get the original namespace
# and not a copy.
slot = _ModuleSlot(__name__, "_varying_dict")
key = next(_varying_key_gen)
def func():
dct = slot.get()
i = dct[key]
if i == len(items):
raise IndexError
else:
x = items[i]
dct[key] = i + 1
if isinstance(x, Exception):
raise x
else:
return x
return func
def map_varying(itemslists):
"""
Like *varying*, but return the full specification for a map() call
on multiple items lists.
"""
def apply(func, *args, **kwargs):
return func(*args, **kwargs)
return apply, list(map(varying, itemslists))
async def geninc(x, delay=0.02):
await asyncio.sleep(delay)
return x + 1
async def asyncinc(x, delay=0.02):
await asyncio.sleep(delay)
return x + 1
_readone_queues: dict[Any, asyncio.Queue] = {}
async def readone(comm):
"""
Read one message at a time from a comm that reads lists of
messages.
"""
try:
q = _readone_queues[comm]
except KeyError:
q = _readone_queues[comm] = asyncio.Queue()
async def background_read():
while True:
try:
messages = await comm.read()
except CommClosedError:
break
for msg in messages:
q.put_nowait(msg)
q.put_nowait(None)
del _readone_queues[comm]
background_read()
msg = await q.get()
if msg is None:
raise CommClosedError
else:
return msg
def run_scheduler(q, nputs, config, port=0, **kwargs):
with dask.config.set(config):
from distributed import Scheduler
# On Python 2.7 and Unix, fork() is used to spawn child processes,
# so avoid inheriting the parent's IO loop.
with pristine_loop() as loop:
async def _():
scheduler = await Scheduler(
validate=True, host="127.0.0.1", port=port, **kwargs
)
for i in range(nputs):
q.put(scheduler.address)
await scheduler.finished()
try:
loop.run_sync(_)
finally:
loop.close(all_fds=True)
def run_worker(q, scheduler_q, config, **kwargs):
with dask.config.set(config):
from distributed import Worker
reset_logger_locks()
with log_errors():
with pristine_loop() as loop:
scheduler_addr = scheduler_q.get()
async def _():
worker = await Worker(scheduler_addr, validate=True, **kwargs)
q.put(worker.address)
await worker.finished()
try:
loop.run_sync(_)
finally:
loop.close(all_fds=True)
def run_nanny(q, scheduler_q, config, **kwargs):
with dask.config.set(config):
with log_errors():
with pristine_loop() as loop:
scheduler_addr = scheduler_q.get()
async def _():
worker = await Nanny(scheduler_addr, validate=True, **kwargs)
q.put(worker.address)
await worker.finished()
try:
loop.run_sync(_)
finally:
loop.close(all_fds=True)
@contextmanager
def check_active_rpc(loop, active_rpc_timeout=1):
active_before = set(rpc.active)
yield
# Some streams can take a bit of time to notice their peer
# has closed, and keep a coroutine (*) waiting for a CommClosedError
# before calling close_rpc() after a CommClosedError.
# This would happen especially if a non-localhost address is used,
# as Nanny does.
# (*) (example: gather_from_workers())
def fail():
pytest.fail(
"some RPCs left active by test: %s" % (set(rpc.active) - active_before)
)
async def wait():
await async_wait_for(
lambda: len(set(rpc.active) - active_before) == 0,
timeout=active_rpc_timeout,
fail_func=fail,
)
loop.run_sync(wait)
@pytest.fixture
def cluster_fixture(loop):
with cluster() as (scheduler, workers):
yield (scheduler, workers)
@pytest.fixture
def s(cluster_fixture):
scheduler, workers = cluster_fixture
return scheduler
@pytest.fixture
def a(cluster_fixture):
scheduler, workers = cluster_fixture
return workers[0]
@pytest.fixture
def b(cluster_fixture):
scheduler, workers = cluster_fixture
return workers[1]
@pytest.fixture
def client(loop, cluster_fixture):
scheduler, workers = cluster_fixture
with Client(scheduler["address"], loop=loop) as client:
yield client
# Compatibility. A lot of tests simply use `c` as fixture name
c = client
@pytest.fixture
def client_secondary(loop, cluster_fixture):
scheduler, workers = cluster_fixture
with Client(scheduler["address"], loop=loop) as client:
yield client
@contextmanager
def tls_cluster_context(
worker_kwargs=None, scheduler_kwargs=None, security=None, **kwargs
):
security = security or tls_only_security()
worker_kwargs = assoc(worker_kwargs or {}, "security", security)
scheduler_kwargs = assoc(scheduler_kwargs or {}, "security", security)
with cluster(
worker_kwargs=worker_kwargs, scheduler_kwargs=scheduler_kwargs, **kwargs
) as (s, workers):
yield s, workers
@pytest.fixture
def tls_cluster(loop, security):
with tls_cluster_context(security=security) as (scheduler, workers):
yield (scheduler, workers)
@pytest.fixture
def tls_client(tls_cluster, loop, security):
s, workers = tls_cluster
with Client(s["address"], security=security, loop=loop) as client:
yield client
@pytest.fixture
def security():
return tls_only_security()
@contextmanager
def cluster(
nworkers=2,
nanny=False,
worker_kwargs={},
active_rpc_timeout=10,
disconnect_timeout=20,
scheduler_kwargs={},
config={},
):
ws = weakref.WeakSet()
enable_proctitle_on_children()
with clean(timeout=active_rpc_timeout, threads=False) as loop:
if nanny:
_run_worker = run_nanny
else:
_run_worker = run_worker
# The scheduler queue will receive the scheduler's address
scheduler_q = mp_context.Queue()
# Launch scheduler
scheduler = mp_context.Process(
name="Dask cluster test: Scheduler",
target=run_scheduler,
args=(scheduler_q, nworkers + 1, config),
kwargs=scheduler_kwargs,
)
ws.add(scheduler)
scheduler.daemon = True
scheduler.start()
# Launch workers
workers = []
for i in range(nworkers):
q = mp_context.Queue()
fn = "_test_worker-%s" % uuid.uuid4()
kwargs = merge(
{
"nthreads": 1,
"local_directory": fn,
"memory_limit": system.MEMORY_LIMIT,
},
worker_kwargs,
)
proc = mp_context.Process(
name="Dask cluster test: Worker",
target=_run_worker,
args=(q, scheduler_q, config),
kwargs=kwargs,
)
ws.add(proc)
workers.append({"proc": proc, "queue": q, "dir": fn})
for worker in workers:
worker["proc"].start()
try:
for worker in workers:
worker["address"] = worker["queue"].get(timeout=5)
except queue.Empty:
raise pytest.xfail.Exception("Worker failed to start in test")
saddr = scheduler_q.get()
start = time()
try:
try:
security = scheduler_kwargs["security"]
rpc_kwargs = {"connection_args": security.get_connection_args("client")}
except KeyError:
rpc_kwargs = {}
with rpc(saddr, **rpc_kwargs) as s:
while True:
nthreads = loop.run_sync(s.ncores)
if len(nthreads) == nworkers:
break
if time() - start > 5:
raise Exception("Timeout on cluster creation")
# avoid sending processes down to function
yield {"address": saddr}, [
{"address": w["address"], "proc": weakref.ref(w["proc"])}
for w in workers
]
finally:
logger.debug("Closing out test cluster")
loop.run_sync(
lambda: disconnect_all(
[w["address"] for w in workers],
timeout=disconnect_timeout,
rpc_kwargs=rpc_kwargs,
)
)
loop.run_sync(
lambda: disconnect(
saddr, timeout=disconnect_timeout, rpc_kwargs=rpc_kwargs
)
)
scheduler.terminate()
scheduler_q.close()
scheduler_q._reader.close()
scheduler_q._writer.close()
for w in workers:
w["proc"].terminate()
w["queue"].close()
w["queue"]._reader.close()
w["queue"]._writer.close()
scheduler.join(2)
del scheduler
for proc in [w["proc"] for w in workers]:
proc.join(timeout=30)
with suppress(UnboundLocalError):
del worker, w, proc
del workers[:]
for fn in glob("_test_worker-*"):
with suppress(OSError):
shutil.rmtree(fn)
try:
client = default_client()
except ValueError:
pass
else:
client.close()
start = time()
while any(proc.is_alive() for proc in ws):
text = str(list(ws))
sleep(0.2)
assert time() < start + 5, ("Workers still around after five seconds", text)
async def disconnect(addr, timeout=3, rpc_kwargs=None):
rpc_kwargs = rpc_kwargs or {}
async def do_disconnect():
with rpc(addr, **rpc_kwargs) as w:
# If the worker was killed hard (e.g. sigterm) during test runtime,
# we do not know at this point and may not be able to connect
with suppress(EnvironmentError, CommClosedError):
# Do not request a reply since comms will be closed by the
# worker before a reply can be made and we will always trigger
# the timeout
await w.terminate(reply=False)
await asyncio.wait_for(do_disconnect(), timeout=timeout)
async def disconnect_all(addresses, timeout=3, rpc_kwargs=None):
await asyncio.gather(*(disconnect(addr, timeout, rpc_kwargs) for addr in addresses))
def gen_test(timeout: float = _TEST_TIMEOUT) -> Callable[[Callable], Callable]:
"""Coroutine test
@gen_test(timeout=5)
async def test_foo():
await ... # use tornado coroutines
"""
assert timeout, (
"timeout should always be set and it should be smaller than the global one from"
"pytest-timeout"
)
def _(func):
def test_func():
with clean() as loop:
if iscoroutinefunction(func):
cor = func
else:
cor = gen.coroutine(func)
loop.run_sync(cor, timeout=timeout)
return test_func
return _
async def start_cluster(
nthreads: list[tuple[str, int] | tuple[str, int, dict]],
scheduler_addr: str,
loop: IOLoop,
security: Security | dict[str, Any] | None = None,
Worker: type[ServerNode] = Worker,
scheduler_kwargs: dict[str, Any] = {},
worker_kwargs: dict[str, Any] = {},
) -> tuple[Scheduler, list[ServerNode]]:
s = await Scheduler(
loop=loop,
validate=True,
security=security,
port=0,
host=scheduler_addr,
**scheduler_kwargs,
)
workers = [
Worker(
s.address,
nthreads=ncore[1],
name=i,
security=security,
loop=loop,
validate=True,
host=ncore[0],
**(
merge(worker_kwargs, ncore[2]) # type: ignore
if len(ncore) > 2
else worker_kwargs
),
)
for i, ncore in enumerate(nthreads)
]
await asyncio.gather(*workers)
start = time()
while (
len(s.workers) < len(nthreads)
or any(ws.status != Status.running for ws in s.workers.values())
or any(comm.comm is None for comm in s.stream_comms.values())
):
await asyncio.sleep(0.01)
if time() > start + 30:
await asyncio.gather(*(w.close(timeout=1) for w in workers))
await s.close(fast=True)
raise TimeoutError("Cluster creation timeout")
return s, workers
async def end_cluster(s, workers):
logger.debug("Closing out test cluster")
async def end_worker(w):
with suppress(TimeoutError, CommClosedError, EnvironmentError):
await w.close(report=False)
await asyncio.gather(*(end_worker(w) for w in workers))
await s.close() # wait until scheduler stops completely
s.stop()
def gen_cluster(
nthreads: list[tuple[str, int] | tuple[str, int, dict]] = [
("127.0.0.1", 1),
("127.0.0.1", 2),
],
ncores: None = None, # deprecated
scheduler="127.0.0.1",
timeout: float = _TEST_TIMEOUT,
security: Security | dict[str, Any] | None = None,
Worker: type[ServerNode] = Worker,
client: bool = False,
scheduler_kwargs: dict[str, Any] = {},
worker_kwargs: dict[str, Any] = {},
client_kwargs: dict[str, Any] = {},
active_rpc_timeout: float = 1,
config: dict[str, Any] = {},
clean_kwargs: dict[str, Any] = {},
allow_unclosed: bool = False,
) -> Callable[[Callable], Callable]:
from distributed import Client
""" Coroutine test with small cluster
@gen_cluster()
async def test_foo(scheduler, worker1, worker2):
await ... # use tornado coroutines
@pytest.mark.parametrize("param", [1, 2, 3])
@gen_cluster()
async def test_foo(scheduler, worker1, worker2, param):
await ... # use tornado coroutines
@gen_cluster()
async def test_foo(scheduler, worker1, worker2, pytest_fixture_a, pytest_fixture_b):
await ... # use tornado coroutines
See also:
start
end
"""
assert timeout, (
"timeout should always be set and it should be smaller than the global one from"
"pytest-timeout"
)
if ncores is not None:
warnings.warn("ncores= has moved to nthreads=", stacklevel=2)
nthreads = ncores
scheduler_kwargs = merge(
{"dashboard": False, "dashboard_address": ":0"}, scheduler_kwargs
)
worker_kwargs = merge(
{"memory_limit": system.MEMORY_LIMIT, "death_timeout": 15}, worker_kwargs
)
def _(func):
if not iscoroutinefunction(func):
raise RuntimeError("gen_cluster only works for coroutine functions.")
@functools.wraps(func)
def test_func(*outer_args, **kwargs):
result = None
workers = []
with clean(timeout=active_rpc_timeout, **clean_kwargs) as loop:
async def coro():
with dask.config.set(config):
s = False
for _ in range(60):
try:
s, ws = await start_cluster(
nthreads,
scheduler,
loop,
security=security,
Worker=Worker,
scheduler_kwargs=scheduler_kwargs,
worker_kwargs=worker_kwargs,
)
except Exception as e:
logger.error(
"Failed to start gen_cluster: "
f"{e.__class__.__name__}: {e}; retrying",
exc_info=True,
)
await asyncio.sleep(1)
else:
workers[:] = ws
args = [s] + workers
break
if s is False:
raise Exception("Could not start cluster")
if client:
c = await Client(
s.address,
loop=loop,
security=security,
asynchronous=True,
**client_kwargs,
)
args = [c] + args
try:
coro = func(*args, *outer_args, **kwargs)
task = asyncio.create_task(coro)
coro2 = asyncio.wait_for(asyncio.shield(task), timeout)
result = await coro2
if s.validate:
s.validate_state()
except asyncio.TimeoutError:
assert task
buffer = io.StringIO()
# This stack indicates where the coro/test is
# suspended
task.print_stack(file=buffer)
task.cancel()
while not task.cancelled():
await asyncio.sleep(0.01)
raise TimeoutError(
f"Test timeout after {timeout}s.\n{buffer.getvalue()}"
) from None
finally:
if client and c.status not in ("closing", "closed"):
await c._close(fast=s.status == Status.closed)
await end_cluster(s, workers)
await asyncio.wait_for(cleanup_global_workers(), 1)
try:
c = await default_client()
except ValueError:
pass
else:
await c._close(fast=True)
def get_unclosed():
return [c for c in Comm._instances if not c.closed()] + [