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): # 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] 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) 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 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, []) def test_read_stdout_after_process_exit(self): @asyncio.coroutine def execute(): code = '\n'.join(['import sys', 'for _ in range(64):', ' sys.stdout.write("x" * 4096)', 'sys.stdout.flush()', 'sys.exit(1)']) fut = asyncio.create_subprocess_exec( sys.executable, '-c', code, stdout=asyncio.subprocess.PIPE, loop=self.loop) process = yield from fut while True: data = yield from process.stdout.read(65536) if data: yield from asyncio.sleep(0.3, loop=self.loop) else: break self.loop.run_until_complete(execute()) 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()