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805 lines (652 loc) · 28.6 KB
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import os
import shutil
import signal
import sys
import unittest
import warnings
from unittest import mock
import asyncio
from asyncio import base_subprocess
from asyncio import subprocess
from test.test_asyncio import utils as test_utils
from test import support
from test.support import os_helper
if sys.platform != 'win32':
from asyncio import unix_events
if support.check_sanitizer(address=True):
raise unittest.SkipTest("Exposes ASAN flakiness in GitHub CI")
# Program blocking
PROGRAM_BLOCKED = [sys.executable, '-c', 'import time; time.sleep(3600)']
# Program copying input to output
PROGRAM_CAT = [
sys.executable, '-c',
';'.join(('import sys',
'data = sys.stdin.buffer.read()',
'sys.stdout.buffer.write(data)'))]
def tearDownModule():
asyncio.set_event_loop_policy(None)
class TestSubprocessTransport(base_subprocess.BaseSubprocessTransport):
def _start(self, *args, **kwargs):
self._proc = mock.Mock()
self._proc.stdin = None
self._proc.stdout = None
self._proc.stderr = None
self._proc.pid = -1
class SubprocessTransportTests(test_utils.TestCase):
def setUp(self):
super().setUp()
self.loop = self.new_test_loop()
self.set_event_loop(self.loop)
def create_transport(self, waiter=None):
protocol = mock.Mock()
transport = TestSubprocessTransport(
self.loop, protocol, ['test'], False,
None, None, None, 0, waiter=waiter)
return (transport, protocol)
def test_proc_exited(self):
waiter = self.loop.create_future()
transport, protocol = self.create_transport(waiter)
transport._process_exited(6)
self.loop.run_until_complete(waiter)
self.assertEqual(transport.get_returncode(), 6)
self.assertTrue(protocol.connection_made.called)
self.assertTrue(protocol.process_exited.called)
self.assertTrue(protocol.connection_lost.called)
self.assertEqual(protocol.connection_lost.call_args[0], (None,))
self.assertFalse(transport.is_closing())
self.assertIsNone(transport._loop)
self.assertIsNone(transport._proc)
self.assertIsNone(transport._protocol)
# methods must raise ProcessLookupError if the process exited
self.assertRaises(ProcessLookupError,
transport.send_signal, signal.SIGTERM)
self.assertRaises(ProcessLookupError, transport.terminate)
self.assertRaises(ProcessLookupError, transport.kill)
transport.close()
def test_subprocess_repr(self):
waiter = self.loop.create_future()
transport, protocol = self.create_transport(waiter)
transport._process_exited(6)
self.loop.run_until_complete(waiter)
self.assertEqual(
repr(transport),
"<TestSubprocessTransport pid=-1 returncode=6>"
)
transport._returncode = None
self.assertEqual(
repr(transport),
"<TestSubprocessTransport pid=-1 running>"
)
transport._pid = None
transport._returncode = None
self.assertEqual(
repr(transport),
"<TestSubprocessTransport not started>"
)
transport.close()
class SubprocessMixin:
def test_stdin_stdout(self):
args = PROGRAM_CAT
async def run(data):
proc = await asyncio.create_subprocess_exec(
*args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
# feed data
proc.stdin.write(data)
await proc.stdin.drain()
proc.stdin.close()
# get output and exitcode
data = await proc.stdout.read()
exitcode = await proc.wait()
return (exitcode, data)
task = run(b'some data')
task = asyncio.wait_for(task, 60.0)
exitcode, stdout = self.loop.run_until_complete(task)
self.assertEqual(exitcode, 0)
self.assertEqual(stdout, b'some data')
def test_communicate(self):
args = PROGRAM_CAT
async def run(data):
proc = await asyncio.create_subprocess_exec(
*args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
stdout, stderr = await proc.communicate(data)
return proc.returncode, stdout
task = run(b'some data')
task = asyncio.wait_for(task, support.LONG_TIMEOUT)
exitcode, stdout = self.loop.run_until_complete(task)
self.assertEqual(exitcode, 0)
self.assertEqual(stdout, b'some data')
def test_shell(self):
proc = self.loop.run_until_complete(
asyncio.create_subprocess_shell('exit 7')
)
exitcode = self.loop.run_until_complete(proc.wait())
self.assertEqual(exitcode, 7)
def test_start_new_session(self):
# start the new process in a new session
proc = self.loop.run_until_complete(
asyncio.create_subprocess_shell(
'exit 8',
start_new_session=True,
)
)
exitcode = self.loop.run_until_complete(proc.wait())
self.assertEqual(exitcode, 8)
def test_kill(self):
args = PROGRAM_BLOCKED
proc = self.loop.run_until_complete(
asyncio.create_subprocess_exec(*args)
)
proc.kill()
returncode = self.loop.run_until_complete(proc.wait())
if sys.platform == 'win32':
self.assertIsInstance(returncode, int)
# expect 1 but sometimes get 0
else:
self.assertEqual(-signal.SIGKILL, returncode)
def test_kill_issue43884(self):
if sys.platform == 'win32':
blocking_shell_command = f'{sys.executable} -c "import time; time.sleep(2)"'
else:
blocking_shell_command = 'sleep 1; sleep 1'
creationflags = 0
if sys.platform == 'win32':
from subprocess import CREATE_NEW_PROCESS_GROUP
# On windows create a new process group so that killing process
# kills the process and all its children.
creationflags = CREATE_NEW_PROCESS_GROUP
proc = self.loop.run_until_complete(
asyncio.create_subprocess_shell(blocking_shell_command, stdout=asyncio.subprocess.PIPE,
creationflags=creationflags)
)
self.loop.run_until_complete(asyncio.sleep(1))
if sys.platform == 'win32':
proc.send_signal(signal.CTRL_BREAK_EVENT)
# On windows it is an alias of terminate which sets the return code
proc.kill()
returncode = self.loop.run_until_complete(proc.wait())
if sys.platform == 'win32':
self.assertIsInstance(returncode, int)
# expect 1 but sometimes get 0
else:
self.assertEqual(-signal.SIGKILL, returncode)
def test_terminate(self):
args = PROGRAM_BLOCKED
proc = self.loop.run_until_complete(
asyncio.create_subprocess_exec(*args)
)
proc.terminate()
returncode = self.loop.run_until_complete(proc.wait())
if sys.platform == 'win32':
self.assertIsInstance(returncode, int)
# expect 1 but sometimes get 0
else:
self.assertEqual(-signal.SIGTERM, returncode)
@unittest.skipIf(sys.platform == 'win32', "Don't have SIGHUP")
def test_send_signal(self):
# bpo-31034: Make sure that we get the default signal handler (killing
# the process). The parent process may have decided to ignore SIGHUP,
# and signal handlers are inherited.
old_handler = signal.signal(signal.SIGHUP, signal.SIG_DFL)
try:
code = 'import time; print("sleeping", flush=True); time.sleep(3600)'
args = [sys.executable, '-c', code]
proc = self.loop.run_until_complete(
asyncio.create_subprocess_exec(
*args,
stdout=subprocess.PIPE,
)
)
async def send_signal(proc):
# basic synchronization to wait until the program is sleeping
line = await proc.stdout.readline()
self.assertEqual(line, b'sleeping\n')
proc.send_signal(signal.SIGHUP)
returncode = await proc.wait()
return returncode
returncode = self.loop.run_until_complete(send_signal(proc))
self.assertEqual(-signal.SIGHUP, returncode)
finally:
signal.signal(signal.SIGHUP, old_handler)
def prepare_broken_pipe_test(self):
# buffer large enough to feed the whole pipe buffer
large_data = b'x' * support.PIPE_MAX_SIZE
# the program ends before the stdin can be fed
proc = self.loop.run_until_complete(
asyncio.create_subprocess_exec(
sys.executable, '-c', 'pass',
stdin=subprocess.PIPE,
)
)
return (proc, large_data)
def test_stdin_broken_pipe(self):
proc, large_data = self.prepare_broken_pipe_test()
async def write_stdin(proc, data):
await asyncio.sleep(0.5)
proc.stdin.write(data)
await proc.stdin.drain()
coro = write_stdin(proc, large_data)
# drain() must raise BrokenPipeError or ConnectionResetError
with test_utils.disable_logger():
self.assertRaises((BrokenPipeError, ConnectionResetError),
self.loop.run_until_complete, coro)
self.loop.run_until_complete(proc.wait())
def test_communicate_ignore_broken_pipe(self):
proc, large_data = self.prepare_broken_pipe_test()
# communicate() must ignore BrokenPipeError when feeding stdin
self.loop.set_exception_handler(lambda loop, msg: None)
self.loop.run_until_complete(proc.communicate(large_data))
self.loop.run_until_complete(proc.wait())
def test_pause_reading(self):
limit = 10
size = (limit * 2 + 1)
async def test_pause_reading():
code = '\n'.join((
'import sys',
'sys.stdout.write("x" * %s)' % size,
'sys.stdout.flush()',
))
connect_read_pipe = self.loop.connect_read_pipe
async def connect_read_pipe_mock(*args, **kw):
transport, protocol = await connect_read_pipe(*args, **kw)
transport.pause_reading = mock.Mock()
transport.resume_reading = mock.Mock()
return (transport, protocol)
self.loop.connect_read_pipe = connect_read_pipe_mock
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
limit=limit,
)
stdout_transport = proc._transport.get_pipe_transport(1)
stdout, stderr = await proc.communicate()
# The child process produced more than limit bytes of output,
# the stream reader transport should pause the protocol to not
# allocate too much memory.
return (stdout, stdout_transport)
# Issue #22685: Ensure that the stream reader pauses the protocol
# when the child process produces too much data
stdout, transport = self.loop.run_until_complete(test_pause_reading())
self.assertEqual(stdout, b'x' * size)
self.assertTrue(transport.pause_reading.called)
self.assertTrue(transport.resume_reading.called)
def test_stdin_not_inheritable(self):
# asyncio issue #209: stdin must not be inheritable, otherwise
# the Process.communicate() hangs
async def len_message(message):
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
)
stdout, stderr = await proc.communicate(message)
exitcode = await proc.wait()
return (stdout, exitcode)
output, exitcode = self.loop.run_until_complete(len_message(b'abc'))
self.assertEqual(output.rstrip(), b'3')
self.assertEqual(exitcode, 0)
def test_empty_input(self):
async def empty_input():
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
)
stdout, stderr = await proc.communicate(b'')
exitcode = await proc.wait()
return (stdout, exitcode)
output, exitcode = self.loop.run_until_complete(empty_input())
self.assertEqual(output.rstrip(), b'0')
self.assertEqual(exitcode, 0)
def test_devnull_input(self):
async def empty_input():
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.DEVNULL,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
)
stdout, stderr = await proc.communicate()
exitcode = await proc.wait()
return (stdout, exitcode)
output, exitcode = self.loop.run_until_complete(empty_input())
self.assertEqual(output.rstrip(), b'0')
self.assertEqual(exitcode, 0)
def test_devnull_output(self):
async def empty_output():
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.DEVNULL,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
)
stdout, stderr = await proc.communicate(b"abc")
exitcode = await proc.wait()
return (stdout, exitcode)
output, exitcode = self.loop.run_until_complete(empty_output())
self.assertEqual(output, None)
self.assertEqual(exitcode, 0)
def test_devnull_error(self):
async def empty_error():
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.DEVNULL,
close_fds=False,
)
stdout, stderr = await proc.communicate(b"abc")
exitcode = await proc.wait()
return (stderr, exitcode)
output, exitcode = self.loop.run_until_complete(empty_error())
self.assertEqual(output, None)
self.assertEqual(exitcode, 0)
@unittest.skipIf(sys.platform != 'linux', "Don't have /dev/stdin")
def test_devstdin_input(self):
async def devstdin_input(message):
code = 'file = open("/dev/stdin"); data = file.read(); print(len(data))'
proc = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
)
stdout, stderr = await proc.communicate(message)
exitcode = await proc.wait()
return (stdout, exitcode)
output, exitcode = self.loop.run_until_complete(devstdin_input(b'abc'))
self.assertEqual(output.rstrip(), b'3')
self.assertEqual(exitcode, 0)
def test_cancel_process_wait(self):
# Issue #23140: cancel Process.wait()
async def cancel_wait():
proc = await asyncio.create_subprocess_exec(*PROGRAM_BLOCKED)
# Create an internal future waiting on the process exit
task = self.loop.create_task(proc.wait())
self.loop.call_soon(task.cancel)
try:
await task
except asyncio.CancelledError:
pass
# Cancel the future
task.cancel()
# Kill the process and wait until it is done
proc.kill()
await proc.wait()
self.loop.run_until_complete(cancel_wait())
def test_cancel_make_subprocess_transport_exec(self):
async def cancel_make_transport():
coro = asyncio.create_subprocess_exec(*PROGRAM_BLOCKED)
task = self.loop.create_task(coro)
self.loop.call_soon(task.cancel)
try:
await task
except asyncio.CancelledError:
pass
# ignore the log:
# "Exception during subprocess creation, kill the subprocess"
with test_utils.disable_logger():
self.loop.run_until_complete(cancel_make_transport())
def test_cancel_post_init(self):
async def cancel_make_transport():
coro = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
*PROGRAM_BLOCKED)
task = self.loop.create_task(coro)
self.loop.call_soon(task.cancel)
try:
await task
except asyncio.CancelledError:
pass
# ignore the log:
# "Exception during subprocess creation, kill the subprocess"
with test_utils.disable_logger():
self.loop.run_until_complete(cancel_make_transport())
test_utils.run_briefly(self.loop)
def test_close_kill_running(self):
async def kill_running():
create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
*PROGRAM_BLOCKED)
transport, protocol = await create
kill_called = False
def kill():
nonlocal kill_called
kill_called = True
orig_kill()
proc = transport.get_extra_info('subprocess')
orig_kill = proc.kill
proc.kill = kill
returncode = transport.get_returncode()
transport.close()
await asyncio.wait_for(transport._wait(), 5)
return (returncode, kill_called)
# Ignore "Close running child process: kill ..." log
with test_utils.disable_logger():
try:
returncode, killed = self.loop.run_until_complete(
kill_running()
)
except asyncio.TimeoutError:
self.skipTest(
"Timeout failure on waiting for subprocess stopping"
)
self.assertIsNone(returncode)
# transport.close() must kill the process if it is still running
self.assertTrue(killed)
test_utils.run_briefly(self.loop)
def test_close_dont_kill_finished(self):
async def kill_running():
create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
*PROGRAM_BLOCKED)
transport, protocol = await create
proc = transport.get_extra_info('subprocess')
# kill the process (but asyncio is not notified immediately)
proc.kill()
proc.wait()
proc.kill = mock.Mock()
proc_returncode = proc.poll()
transport_returncode = transport.get_returncode()
transport.close()
return (proc_returncode, transport_returncode, proc.kill.called)
# Ignore "Unknown child process pid ..." log of SafeChildWatcher,
# emitted because the test already consumes the exit status:
# proc.wait()
with test_utils.disable_logger():
result = self.loop.run_until_complete(kill_running())
test_utils.run_briefly(self.loop)
proc_returncode, transport_return_code, killed = result
self.assertIsNotNone(proc_returncode)
self.assertIsNone(transport_return_code)
# transport.close() must not kill the process if it finished, even if
# the transport was not notified yet
self.assertFalse(killed)
# Unlike SafeChildWatcher, FastChildWatcher does not pop the
# callbacks if waitpid() is called elsewhere. Let's clear them
# manually to avoid a warning when the watcher is detached.
if (sys.platform != 'win32' and
isinstance(self, SubprocessFastWatcherTests)):
asyncio.get_child_watcher()._callbacks.clear()
async def _test_popen_error(self, stdin):
if sys.platform == 'win32':
target = 'asyncio.windows_utils.Popen'
else:
target = 'subprocess.Popen'
with mock.patch(target) as popen:
exc = ZeroDivisionError
popen.side_effect = exc
with warnings.catch_warnings(record=True) as warns:
with self.assertRaises(exc):
await asyncio.create_subprocess_exec(
sys.executable,
'-c',
'pass',
stdin=stdin
)
self.assertEqual(warns, [])
def test_popen_error(self):
# Issue #24763: check that the subprocess transport is closed
# when BaseSubprocessTransport fails
self.loop.run_until_complete(self._test_popen_error(stdin=None))
def test_popen_error_with_stdin_pipe(self):
# Issue #35721: check that newly created socket pair is closed when
# Popen fails
self.loop.run_until_complete(
self._test_popen_error(stdin=subprocess.PIPE))
def test_read_stdout_after_process_exit(self):
async def execute():
code = '\n'.join(['import sys',
'for _ in range(64):',
' sys.stdout.write("x" * 4096)',
'sys.stdout.flush()',
'sys.exit(1)'])
process = await asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdout=asyncio.subprocess.PIPE,
)
while True:
data = await process.stdout.read(65536)
if data:
await asyncio.sleep(0.3)
else:
break
self.loop.run_until_complete(execute())
def test_create_subprocess_exec_text_mode_fails(self):
async def execute():
with self.assertRaises(ValueError):
await subprocess.create_subprocess_exec(sys.executable,
text=True)
with self.assertRaises(ValueError):
await subprocess.create_subprocess_exec(sys.executable,
encoding="utf-8")
with self.assertRaises(ValueError):
await subprocess.create_subprocess_exec(sys.executable,
errors="strict")
self.loop.run_until_complete(execute())
def test_create_subprocess_shell_text_mode_fails(self):
async def execute():
with self.assertRaises(ValueError):
await subprocess.create_subprocess_shell(sys.executable,
text=True)
with self.assertRaises(ValueError):
await subprocess.create_subprocess_shell(sys.executable,
encoding="utf-8")
with self.assertRaises(ValueError):
await subprocess.create_subprocess_shell(sys.executable,
errors="strict")
self.loop.run_until_complete(execute())
def test_create_subprocess_exec_with_path(self):
async def execute():
p = await subprocess.create_subprocess_exec(
os_helper.FakePath(sys.executable), '-c', 'pass')
await p.wait()
p = await subprocess.create_subprocess_exec(
sys.executable, '-c', 'pass', os_helper.FakePath('.'))
await p.wait()
self.assertIsNone(self.loop.run_until_complete(execute()))
def test_subprocess_communicate_stdout(self):
# See https://github.com/python/cpython/issues/100133
async def get_command_stdout(cmd, *args):
proc = await asyncio.create_subprocess_exec(
cmd, *args, stdout=asyncio.subprocess.PIPE,
)
stdout, _ = await proc.communicate()
return stdout.decode().strip()
async def main():
outputs = [f'foo{i}' for i in range(10)]
res = await asyncio.gather(*[get_command_stdout(sys.executable, '-c',
f'print({out!r})') for out in outputs])
self.assertEqual(res, outputs)
self.loop.run_until_complete(main())
if sys.platform != 'win32':
# Unix
class SubprocessWatcherMixin(SubprocessMixin):
Watcher = None
def setUp(self):
super().setUp()
policy = asyncio.get_event_loop_policy()
self.loop = policy.new_event_loop()
self.set_event_loop(self.loop)
watcher = self.Watcher()
watcher.attach_loop(self.loop)
policy.set_child_watcher(watcher)
def tearDown(self):
super().tearDown()
policy = asyncio.get_event_loop_policy()
watcher = policy.get_child_watcher()
policy.set_child_watcher(None)
watcher.attach_loop(None)
watcher.close()
class SubprocessThreadedWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.ThreadedChildWatcher
@unittest.skip("bpo-38323: MultiLoopChildWatcher has a race condition \
and these tests can hang the test suite")
class SubprocessMultiLoopWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.MultiLoopChildWatcher
class SubprocessSafeWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.SafeChildWatcher
class SubprocessFastWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.FastChildWatcher
def has_pidfd_support():
if not hasattr(os, 'pidfd_open'):
return False
try:
os.close(os.pidfd_open(os.getpid()))
except OSError:
return False
return True
@unittest.skipUnless(
has_pidfd_support(),
"operating system does not support pidfds",
)
class SubprocessPidfdWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.PidfdChildWatcher
class GenericWatcherTests(test_utils.TestCase):
def test_create_subprocess_fails_with_inactive_watcher(self):
watcher = mock.create_autospec(
asyncio.AbstractChildWatcher,
**{"__enter__.return_value.is_active.return_value": False}
)
async def execute():
asyncio.set_child_watcher(watcher)
with self.assertRaises(RuntimeError):
await subprocess.create_subprocess_exec(
os_helper.FakePath(sys.executable), '-c', 'pass')
watcher.add_child_handler.assert_not_called()
with asyncio.Runner(loop_factory=asyncio.new_event_loop) as runner:
self.assertIsNone(runner.run(execute()))
self.assertListEqual(watcher.mock_calls, [
mock.call.__enter__(),
mock.call.__enter__().is_active(),
mock.call.__exit__(RuntimeError, mock.ANY, mock.ANY),
])
else:
# Windows
class SubprocessProactorTests(SubprocessMixin, test_utils.TestCase):
def setUp(self):
super().setUp()
self.loop = asyncio.ProactorEventLoop()
self.set_event_loop(self.loop)
if __name__ == '__main__':
unittest.main()