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mitogen/tests/parent_test.py

229 lines
7.4 KiB
Python

import errno
import os
import subprocess
import tempfile
import time
import unittest2
import testlib
import mitogen.parent
def wait_for_child(pid, timeout=1.0):
deadline = time.time() + timeout
while timeout < time.time():
try:
target_pid, status = os.waitpid(pid, os.WNOHANG)
if target_pid == pid:
return
except OSError:
e = sys.exc_info()[1]
if e.args[0] == errno.ECHILD:
return
time.sleep(0.05)
assert False, "wait_for_child() timed out"
class ReapChildTest(testlib.RouterMixin, testlib.TestCase):
def test_connect_timeout(self):
# Ensure the child process is reaped if the connection times out.
stream = mitogen.parent.Stream(
router=self.router,
remote_id=1234,
old_router=self.router,
max_message_size=self.router.max_message_size,
python_path=testlib.data_path('python_never_responds.sh'),
connect_timeout=0.5,
)
self.assertRaises(mitogen.core.TimeoutError,
lambda: stream.connect()
)
wait_for_child(stream.pid)
e = self.assertRaises(OSError,
lambda: os.kill(stream.pid, 0)
)
self.assertEquals(e.args[0], errno.ESRCH)
class StreamErrorTest(testlib.RouterMixin, testlib.TestCase):
def test_direct_eof(self):
e = self.assertRaises(mitogen.core.StreamError,
lambda: self.router.local(
python_path='true',
connect_timeout=3,
)
)
self.assertEquals(e.args[0], "EOF on stream; last 300 bytes received: ''")
def test_via_eof(self):
# Verify FD leakage does not keep failed process open.
local = self.router.fork()
e = self.assertRaises(mitogen.core.StreamError,
lambda: self.router.local(
via=local,
python_path='true',
connect_timeout=3,
)
)
self.assertTrue("EOF on stream; last 300 bytes received: ''" in e.args[0])
def test_direct_enoent(self):
e = self.assertRaises(mitogen.core.StreamError,
lambda: self.router.local(
python_path='derp',
connect_timeout=3,
)
)
prefix = 'Child start failed: [Errno 2] No such file or directory.'
self.assertTrue(e.args[0].startswith(prefix))
def test_via_enoent(self):
local = self.router.fork()
e = self.assertRaises(mitogen.core.StreamError,
lambda: self.router.local(
via=local,
python_path='derp',
connect_timeout=3,
)
)
s = 'Child start failed: [Errno 2] No such file or directory.'
self.assertTrue(s in e.args[0])
class ContextTest(testlib.RouterMixin, unittest2.TestCase):
def test_context_shutdown(self):
local = self.router.local()
pid = local.call(os.getpid)
local.shutdown(wait=True)
wait_for_child(pid)
self.assertRaises(OSError, lambda: os.kill(pid, 0))
class TtyCreateChildTest(unittest2.TestCase):
func = staticmethod(mitogen.parent.tty_create_child)
def test_dev_tty_open_succeeds(self):
# In the early days of UNIX, a process that lacked a controlling TTY
# would acquire one simply by opening an existing TTY. Linux and OS X
# continue to follow this behaviour, however at least FreeBSD moved to
# requiring an explicit ioctl(). Linux supports it, but we don't yet
# use it there and anyway the behaviour will never change, so no point
# in fixing things that aren't broken. Below we test that
# getpass-loving apps like sudo and ssh get our slave PTY when they
# attempt to open /dev/tty, which is what they both do on attempting to
# read a password.
tf = tempfile.NamedTemporaryFile()
try:
pid, fd, _ = self.func([
'bash', '-c', 'exec 2>%s; echo hi > /dev/tty' % (tf.name,)
])
deadline = time.time() + 5.0
for line in mitogen.parent.iter_read([fd], deadline):
self.assertEquals('hi\n', line)
break
waited_pid, status = os.waitpid(pid, 0)
self.assertEquals(pid, waited_pid)
self.assertEquals(0, status)
self.assertEquals('', tf.read())
finally:
tf.close()
class IterReadTest(unittest2.TestCase):
func = staticmethod(mitogen.parent.iter_read)
def make_proc(self):
args = [testlib.data_path('iter_read_generator.sh')]
proc = subprocess.Popen(args, stdout=subprocess.PIPE)
mitogen.core.set_nonblock(proc.stdout.fileno())
return proc
def test_no_deadline(self):
proc = self.make_proc()
try:
reader = self.func([proc.stdout.fileno()])
for i, chunk in enumerate(reader, 1):
self.assertEqual(i, int(chunk))
if i > 3:
break
finally:
proc.terminate()
def test_deadline_exceeded_before_call(self):
proc = self.make_proc()
reader = self.func([proc.stdout.fileno()], 0)
try:
got = []
try:
for chunk in reader:
got.append(chunk)
assert 0, 'TimeoutError not raised'
except mitogen.core.TimeoutError:
self.assertEqual(len(got), 0)
finally:
proc.terminate()
def test_deadline_exceeded_during_call(self):
proc = self.make_proc()
reader = self.func([proc.stdout.fileno()], time.time() + 0.4)
try:
got = []
try:
for chunk in reader:
got.append(chunk)
assert 0, 'TimeoutError not raised'
except mitogen.core.TimeoutError:
# Give a little wiggle room in case of imperfect scheduling.
# Ideal number should be 9.
self.assertLess(3, len(got))
self.assertLess(len(got), 5)
finally:
proc.terminate()
class WriteAllTest(unittest2.TestCase):
func = staticmethod(mitogen.parent.write_all)
def make_proc(self):
args = [testlib.data_path('write_all_consumer.sh')]
proc = subprocess.Popen(args, stdin=subprocess.PIPE)
mitogen.core.set_nonblock(proc.stdin.fileno())
return proc
ten_ms_chunk = ('x' * 65535)
def test_no_deadline(self):
proc = self.make_proc()
try:
self.func(proc.stdin.fileno(), self.ten_ms_chunk)
finally:
proc.terminate()
def test_deadline_exceeded_before_call(self):
proc = self.make_proc()
try:
self.assertRaises(mitogen.core.TimeoutError, (
lambda: self.func(proc.stdin.fileno(), self.ten_ms_chunk, 0)
))
finally:
proc.terminate()
def test_deadline_exceeded_during_call(self):
proc = self.make_proc()
try:
deadline = time.time() + 0.1 # 100ms deadline
self.assertRaises(mitogen.core.TimeoutError, (
lambda: self.func(proc.stdin.fileno(),
self.ten_ms_chunk * 100, # 1s of data
deadline)
))
finally:
proc.terminate()
if __name__ == '__main__':
unittest2.main()