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mitogen/tests/fork_test.py

98 lines
2.8 KiB
Python

import ctypes
import os
import random
import ssl
import struct
import sys
import mitogen
import unittest2
import testlib
import plain_old_module
IS_64BIT = struct.calcsize('P') == 8
PLATFORM_TO_PATH = {
('darwin', False): '/usr/lib/libssl.dylib',
('darwin', True): '/usr/lib/libssl.dylib',
('linux2', False): '/usr/lib/libssl.so',
('linux2', True): '/usr/lib/x86_64-linux-gnu/libssl.so',
}
c_ssl = ctypes.CDLL(PLATFORM_TO_PATH[sys.platform, IS_64BIT])
c_ssl.RAND_pseudo_bytes.argtypes = [ctypes.c_char_p, ctypes.c_int]
c_ssl.RAND_pseudo_bytes.restype = ctypes.c_int
def ping():
return 123
def random_random():
return random.random()
def RAND_pseudo_bytes(n=32):
buf = ctypes.create_string_buffer(n)
assert 1 == c_ssl.RAND_pseudo_bytes(buf, n)
return buf[:]
def exercise_importer(n):
"""
Ensure the forked child has a sensible importer.
"""
sys.path.remove(testlib.DATA_DIR)
import simple_pkg.a
return simple_pkg.a.subtract_one_add_two(n)
class ForkTest(testlib.RouterMixin, unittest2.TestCase):
def test_okay(self):
context = self.router.fork()
self.assertNotEqual(context.call(os.getpid), os.getpid())
self.assertEqual(context.call(os.getppid), os.getpid())
def test_random_module_diverges(self):
context = self.router.fork()
self.assertNotEqual(context.call(random_random), random_random())
def test_ssl_module_diverges(self):
# Ensure generator state is initialized.
RAND_pseudo_bytes()
context = self.router.fork()
self.assertNotEqual(context.call(RAND_pseudo_bytes),
RAND_pseudo_bytes())
def test_importer(self):
context = self.router.fork()
self.assertEqual(2, context.call(exercise_importer, 1))
class DoubleChildTest(testlib.RouterMixin, unittest2.TestCase):
def test_okay(self):
# When forking from the master process, Mitogen had nothing to do with
# setting up stdio -- that was inherited wherever the Master is running
# (supervisor, iTerm, etc). When forking from a Mitogen child context
# however, Mitogen owns all of fd 0, 1, and 2, and during the fork
# procedure, it deletes all of these descriptors. That leaves the
# process in a weird state that must be handled by some combination of
# fork.py and ExternalContext.main().
# Below we simply test whether ExternalContext.main() managed to boot
# successfully. In future, we need lots more tests.
c1 = self.router.fork()
c2 = self.router.fork(via=c1)
self.assertEquals(123, c2.call(ping))
def test_importer(self):
c1 = self.router.fork(name='c1')
c2 = self.router.fork(name='c2', via=c1)
self.assertEqual(2, c2.call(exercise_importer, 1))
if __name__ == '__main__':
unittest2.main()