tractor/tests/test_multi_program.py

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"""
Multiple python programs invoking ``tractor.run()``
"""
import platform
import sys
import time
import signal
import subprocess
import pytest
import tractor
from conftest import tractor_test
# Sending signal.SIGINT on subprocess fails on windows. Use CTRL_* alternatives
if platform.system() == 'Windows':
_KILL_SIGNAL = signal.CTRL_BREAK_EVENT
_INT_SIGNAL = signal.CTRL_C_EVENT
_INT_RETURN_CODE = 3221225786
_PROC_SPAWN_WAIT = 2
else:
_KILL_SIGNAL = signal.SIGKILL
_INT_SIGNAL = signal.SIGINT
_INT_RETURN_CODE = 1 if sys.version_info < (3, 8) else -signal.SIGINT.value
_PROC_SPAWN_WAIT = 0.6 if sys.version_info < (3, 7) else 0.4
def sig_prog(proc, sig):
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"Kill the actor-process with ``sig``."
proc.send_signal(sig)
time.sleep(0.1)
if not proc.poll():
# TODO: why sometimes does SIGINT not work on teardown?
# seems to happen only when trace logging enabled?
proc.send_signal(_KILL_SIGNAL)
ret = proc.wait()
assert ret
@pytest.fixture
def daemon(loglevel, testdir, arb_addr):
cmdargs = [
sys.executable, '-c',
"import tractor; tractor.run_daemon((), arbiter_addr={}, loglevel={})"
.format(
arb_addr,
"'{}'".format(loglevel) if loglevel else None)
]
kwargs = dict()
if platform.system() == 'Windows':
# without this, tests hang on windows forever
kwargs['creationflags'] = subprocess.CREATE_NEW_PROCESS_GROUP
proc = testdir.popen(
cmdargs,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
**kwargs,
)
assert not proc.returncode
time.sleep(_PROC_SPAWN_WAIT)
yield proc
sig_prog(proc, _INT_SIGNAL)
def test_abort_on_sigint(daemon):
assert daemon.returncode is None
time.sleep(0.1)
sig_prog(daemon, _INT_SIGNAL)
assert daemon.returncode == _INT_RETURN_CODE
# XXX: oddly, couldn't get capfd.readouterr() to work here?
if platform.system() != 'Windows':
# don't check stderr on windows as its empty when sending CTRL_C_EVENT
assert "KeyboardInterrupt" in str(daemon.stderr.read())
@tractor_test
async def test_cancel_remote_arbiter(daemon, arb_addr):
assert not tractor.current_actor().is_arbiter
async with tractor.get_arbiter(*arb_addr) as portal:
await portal.cancel_actor()
time.sleep(0.1)
# the arbiter channel server is cancelled but not its main task
assert daemon.returncode is None
# no arbiter socket should exist
with pytest.raises(OSError):
async with tractor.get_arbiter(*arb_addr) as portal:
pass
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def test_register_duplicate_name(daemon, arb_addr):
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async def main():
assert not tractor.current_actor().is_arbiter
async with tractor.open_nursery() as n:
p1 = await n.start_actor('doggy')
p2 = await n.start_actor('doggy')
async with tractor.wait_for_actor('doggy') as portal:
assert portal.channel.uid in (p2.channel.uid, p1.channel.uid)
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await n.cancel()
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# run it manually since we want to start **after**
# the other "daemon" program
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tractor.run(main, arbiter_addr=arb_addr)