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import signal
import sys
import unittest
import warnings
from unittest import mock
import asyncio
from asyncio import base_subprocess
from asyncio import subprocess
from asyncio import test_utils
try:
from test import support
except ImportError:
from asyncio import test_support as support
if sys.platform != 'win32':
from asyncio import unix_events
# 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)'))]
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
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()
protocol.connection_made._is_coroutine = False
protocol.process_exited._is_coroutine = False
transport = TestSubprocessTransport(
self.loop, protocol, ['test'], False,
None, None, None, 0, waiter=waiter)
return (transport, protocol)
def test_proc_exited(self):
waiter = asyncio.Future(loop=self.loop)
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()
class SubprocessMixin:
def test_stdin_stdout(self):
args = PROGRAM_CAT
@asyncio.coroutine
def run(data):
proc = yield from asyncio.create_subprocess_exec(
*args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
loop=self.loop)
# feed data
proc.stdin.write(data)
yield from proc.stdin.drain()
proc.stdin.close()
# get output and exitcode
data = yield from proc.stdout.read()
exitcode = yield from proc.wait()
return (exitcode, data)
task = run(b'some data')
task = asyncio.wait_for(task, 60.0, loop=self.loop)
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
@asyncio.coroutine
def run(data):
proc = yield from asyncio.create_subprocess_exec(
*args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
loop=self.loop)
stdout, stderr = yield from proc.communicate(data)
return proc.returncode, stdout
task = run(b'some data')
task = asyncio.wait_for(task, 60.0, loop=self.loop)
exitcode, stdout = self.loop.run_until_complete(task)
self.assertEqual(exitcode, 0)
self.assertEqual(stdout, b'some data')
def test_shell(self):
create = asyncio.create_subprocess_shell('exit 7',
loop=self.loop)
proc = self.loop.run_until_complete(create)
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
create = asyncio.create_subprocess_shell('exit 8',
start_new_session=True,
loop=self.loop)
proc = self.loop.run_until_complete(create)
exitcode = self.loop.run_until_complete(proc.wait())
self.assertEqual(exitcode, 8)
def test_kill(self):
args = PROGRAM_BLOCKED
create = asyncio.create_subprocess_exec(*args, loop=self.loop)
proc = self.loop.run_until_complete(create)
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
create = asyncio.create_subprocess_exec(*args, loop=self.loop)
proc = self.loop.run_until_complete(create)
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):
code = 'import time; print("sleeping", flush=True); time.sleep(3600)'
args = [sys.executable, '-c', code]
create = asyncio.create_subprocess_exec(*args,
stdout=subprocess.PIPE,
loop=self.loop)
proc = self.loop.run_until_complete(create)
@asyncio.coroutine
def send_signal(proc):
# basic synchronization to wait until the program is sleeping
line = yield from proc.stdout.readline()
self.assertEqual(line, b'sleeping\n')
proc.send_signal(signal.SIGHUP)
returncode = (yield from proc.wait())
return returncode
returncode = self.loop.run_until_complete(send_signal(proc))
self.assertEqual(-signal.SIGHUP, returncode)
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 feeded
create = asyncio.create_subprocess_exec(
sys.executable, '-c', 'pass',
stdin=subprocess.PIPE,
loop=self.loop)
proc = self.loop.run_until_complete(create)
return (proc, large_data)
def test_stdin_broken_pipe(self):
proc, large_data = self.prepare_broken_pipe_test()
@asyncio.coroutine
def write_stdin(proc, data):
proc.stdin.write(data)
yield from 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
with test_utils.disable_logger():
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)
@asyncio.coroutine
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
@asyncio.coroutine
def connect_read_pipe_mock(*args, **kw):
transport, protocol = yield from 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 = yield from asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
limit=limit,
loop=self.loop)
stdout_transport = proc._transport.get_pipe_transport(1)
stdout, stderr = yield from 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
@asyncio.coroutine
def len_message(message):
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = yield from asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
loop=self.loop)
stdout, stderr = yield from proc.communicate(message)
exitcode = yield from 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):
@asyncio.coroutine
def empty_input():
code = 'import sys; data = sys.stdin.read(); print(len(data))'
proc = yield from asyncio.create_subprocess_exec(
sys.executable, '-c', code,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
close_fds=False,
loop=self.loop)
stdout, stderr = yield from proc.communicate(b'')
exitcode = yield from 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_cancel_process_wait(self):
# Issue #23140: cancel Process.wait()
@asyncio.coroutine
def cancel_wait():
proc = yield from asyncio.create_subprocess_exec(
*PROGRAM_BLOCKED,
loop=self.loop)
# Create an internal future waiting on the process exit
task = self.loop.create_task(proc.wait())
self.loop.call_soon(task.cancel)
try:
yield from task
except asyncio.CancelledError:
pass
# Cancel the future
task.cancel()
# Kill the process and wait until it is done
proc.kill()
yield from proc.wait()
self.loop.run_until_complete(cancel_wait())
def test_cancel_make_subprocess_transport_exec(self):
@asyncio.coroutine
def cancel_make_transport():
coro = asyncio.create_subprocess_exec(*PROGRAM_BLOCKED,
loop=self.loop)
task = self.loop.create_task(coro)
self.loop.call_soon(task.cancel)
try:
yield from 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):
@asyncio.coroutine
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:
yield from 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):
@asyncio.coroutine
def kill_running():
create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
*PROGRAM_BLOCKED)
transport, protocol = yield from 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()
yield from transport._wait()
return (returncode, kill_called)
# Ignore "Close running child process: kill ..." log
with test_utils.disable_logger():
returncode, killed = self.loop.run_until_complete(kill_running())
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):
@asyncio.coroutine
def kill_running():
create = self.loop.subprocess_exec(asyncio.SubprocessProtocol,
*PROGRAM_BLOCKED)
transport, protocol = yield from 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()
def test_popen_error(self):
# Issue #24763: check that the subprocess transport is closed
# when BaseSubprocessTransport fails
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
create = asyncio.create_subprocess_exec(sys.executable, '-c',
'pass', loop=self.loop)
with warnings.catch_warnings(record=True) as warns:
with self.assertRaises(exc):
self.loop.run_until_complete(create)
self.assertEqual(warns, [])
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)
self.addCleanup(policy.set_child_watcher, None)
class SubprocessSafeWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.SafeChildWatcher
class SubprocessFastWatcherTests(SubprocessWatcherMixin,
test_utils.TestCase):
Watcher = unix_events.FastChildWatcher
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()