cpython/Lib/test/test_selectors.py

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import errno
import random
import selectors
import signal
import socket
from test import support
from time import sleep
import unittest
try:
from time import monotonic as time
except ImportError:
from time import time as time
try:
import resource
except ImportError:
resource = None
if hasattr(socket, 'socketpair'):
socketpair = socket.socketpair
else:
def socketpair(family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0):
with socket.socket(family, type, proto) as l:
l.bind((support.HOST, 0))
l.listen(3)
c = socket.socket(family, type, proto)
try:
c.connect(l.getsockname())
caddr = c.getsockname()
while True:
a, addr = l.accept()
# check that we've got the correct client
if addr == caddr:
return c, a
a.close()
except OSError:
c.close()
raise
def find_ready_matching(ready, flag):
match = []
for key, events in ready:
if events & flag:
match.append(key.fileobj)
return match
class BaseSelectorTestCase(unittest.TestCase):
def test_register(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
key = s.register(rd, selectors.EVENT_READ, "data")
self.assertIsInstance(key, selectors.SelectorKey)
self.assertEqual(key.fileobj, rd)
self.assertEqual(key.fd, rd.fileno())
self.assertEqual(key.events, selectors.EVENT_READ)
self.assertEqual(key.data, "data")
# register an unknown event
self.assertRaises(ValueError, s.register, 0, 999999)
# register an invalid FD
self.assertRaises(ValueError, s.register, -10, selectors.EVENT_READ)
# register twice
self.assertRaises(KeyError, s.register, rd, selectors.EVENT_READ)
# register the same FD, but with a different object
self.assertRaises(KeyError, s.register, rd.fileno(),
selectors.EVENT_READ)
def test_unregister(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
s.register(rd, selectors.EVENT_READ)
s.unregister(rd)
# unregister an unknown file obj
self.assertRaises(KeyError, s.unregister, 999999)
# unregister twice
self.assertRaises(KeyError, s.unregister, rd)
def test_modify(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
key = s.register(rd, selectors.EVENT_READ)
# modify events
key2 = s.modify(rd, selectors.EVENT_WRITE)
self.assertNotEqual(key.events, key2.events)
self.assertEqual(key2, s.get_key(rd))
s.unregister(rd)
# modify data
d1 = object()
d2 = object()
key = s.register(rd, selectors.EVENT_READ, d1)
key2 = s.modify(rd, selectors.EVENT_READ, d2)
self.assertEqual(key.events, key2.events)
self.assertNotEqual(key.data, key2.data)
self.assertEqual(key2, s.get_key(rd))
self.assertEqual(key2.data, d2)
# modify unknown file obj
self.assertRaises(KeyError, s.modify, 999999, selectors.EVENT_READ)
def test_close(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
s.register(rd, selectors.EVENT_READ)
s.register(wr, selectors.EVENT_WRITE)
s.close()
self.assertRaises(KeyError, s.get_key, rd)
self.assertRaises(KeyError, s.get_key, wr)
def test_get_key(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
key = s.register(rd, selectors.EVENT_READ, "data")
self.assertEqual(key, s.get_key(rd))
# unknown file obj
self.assertRaises(KeyError, s.get_key, 999999)
def test_select(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
s.register(rd, selectors.EVENT_READ)
wr_key = s.register(wr, selectors.EVENT_WRITE)
result = s.select()
for key, events in result:
self.assertTrue(isinstance(key, selectors.SelectorKey))
self.assertTrue(events)
self.assertFalse(events & ~(selectors.EVENT_READ |
selectors.EVENT_WRITE))
self.assertEqual([(wr_key, selectors.EVENT_WRITE)], result)
def test_context_manager(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
with s as sel:
sel.register(rd, selectors.EVENT_READ)
sel.register(wr, selectors.EVENT_WRITE)
self.assertRaises(KeyError, s.get_key, rd)
self.assertRaises(KeyError, s.get_key, wr)
def test_fileno(self):
s = self.SELECTOR()
self.addCleanup(s.close)
if hasattr(s, 'fileno'):
fd = s.fileno()
self.assertTrue(isinstance(fd, int))
self.assertGreaterEqual(fd, 0)
def test_selector(self):
s = self.SELECTOR()
self.addCleanup(s.close)
NUM_SOCKETS = 12
MSG = b" This is a test."
MSG_LEN = len(MSG)
readers = []
writers = []
r2w = {}
w2r = {}
for i in range(NUM_SOCKETS):
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
s.register(rd, selectors.EVENT_READ)
s.register(wr, selectors.EVENT_WRITE)
readers.append(rd)
writers.append(wr)
r2w[rd] = wr
w2r[wr] = rd
bufs = []
while writers:
ready = s.select()
ready_writers = find_ready_matching(ready, selectors.EVENT_WRITE)
if not ready_writers:
self.fail("no sockets ready for writing")
wr = random.choice(ready_writers)
wr.send(MSG)
for i in range(10):
ready = s.select()
ready_readers = find_ready_matching(ready,
selectors.EVENT_READ)
if ready_readers:
break
# there might be a delay between the write to the write end and
# the read end is reported ready
sleep(0.1)
else:
self.fail("no sockets ready for reading")
self.assertEqual([w2r[wr]], ready_readers)
rd = ready_readers[0]
buf = rd.recv(MSG_LEN)
self.assertEqual(len(buf), MSG_LEN)
bufs.append(buf)
s.unregister(r2w[rd])
s.unregister(rd)
writers.remove(r2w[rd])
self.assertEqual(bufs, [MSG] * NUM_SOCKETS)
def test_timeout(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
s.register(wr, selectors.EVENT_WRITE)
t = time()
self.assertEqual(1, len(s.select(0)))
self.assertEqual(1, len(s.select(-1)))
self.assertTrue(time() - t < 0.5)
s.unregister(wr)
s.register(rd, selectors.EVENT_READ)
t = time()
self.assertFalse(s.select(0))
self.assertFalse(s.select(-1))
self.assertTrue(time() - t < 0.5)
t = time()
self.assertFalse(s.select(1))
self.assertTrue(0.5 < time() - t < 1.5)
@unittest.skipUnless(hasattr(signal, "alarm"),
"signal.alarm() required for this test")
def test_interrupted_retry(self):
s = self.SELECTOR()
self.addCleanup(s.close)
rd, wr = socketpair()
self.addCleanup(rd.close)
self.addCleanup(wr.close)
orig_alrm_handler = signal.signal(signal.SIGALRM, lambda *args: None)
self.addCleanup(signal.signal, signal.SIGALRM, orig_alrm_handler)
self.addCleanup(signal.alarm, 0)
signal.alarm(1)
s.register(rd, selectors.EVENT_READ)
t = time()
self.assertFalse(s.select(2))
self.assertLess(time() - t, 2.5)
class ScalableSelectorMixIn:
# see issue #18963 for why it's skipped on older OS X versions
@support.requires_mac_ver(10, 5)
@unittest.skipUnless(resource, "Test needs resource module")
def test_above_fd_setsize(self):
# A scalable implementation should have no problem with more than
# FD_SETSIZE file descriptors. Since we don't know the value, we just
# try to set the soft RLIMIT_NOFILE to the hard RLIMIT_NOFILE ceiling.
soft, hard = resource.getrlimit(resource.RLIMIT_NOFILE)
try:
resource.setrlimit(resource.RLIMIT_NOFILE, (hard, hard))
self.addCleanup(resource.setrlimit, resource.RLIMIT_NOFILE,
(soft, hard))
NUM_FDS = hard
except (OSError, ValueError):
NUM_FDS = soft
# guard for already allocated FDs (stdin, stdout...)
NUM_FDS -= 32
s = self.SELECTOR()
self.addCleanup(s.close)
for i in range(NUM_FDS // 2):
try:
rd, wr = socketpair()
except OSError:
# too many FDs, skip - note that we should only catch EMFILE
# here, but apparently *BSD and Solaris can fail upon connect()
# or bind() with EADDRNOTAVAIL, so let's be safe
self.skipTest("FD limit reached")
self.addCleanup(rd.close)
self.addCleanup(wr.close)
try:
s.register(rd, selectors.EVENT_READ)
s.register(wr, selectors.EVENT_WRITE)
except OSError as e:
if e.errno == errno.ENOSPC:
# this can be raised by epoll if we go over
# fs.epoll.max_user_watches sysctl
self.skipTest("FD limit reached")
raise
self.assertEqual(NUM_FDS // 2, len(s.select()))
class DefaultSelectorTestCase(BaseSelectorTestCase):
SELECTOR = selectors.DefaultSelector
class SelectSelectorTestCase(BaseSelectorTestCase):
SELECTOR = selectors.SelectSelector
@unittest.skipUnless(hasattr(selectors, 'PollSelector'),
"Test needs selectors.PollSelector")
class PollSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn):
SELECTOR = getattr(selectors, 'PollSelector', None)
@unittest.skipUnless(hasattr(selectors, 'EpollSelector'),
"Test needs selectors.EpollSelector")
class EpollSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn):
SELECTOR = getattr(selectors, 'EpollSelector', None)
@unittest.skipUnless(hasattr(selectors, 'KqueueSelector'),
"Test needs selectors.KqueueSelector)")
class KqueueSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn):
SELECTOR = getattr(selectors, 'KqueueSelector', None)
def test_main():
tests = [DefaultSelectorTestCase, SelectSelectorTestCase,
PollSelectorTestCase, EpollSelectorTestCase,
KqueueSelectorTestCase]
support.run_unittest(*tests)
support.reap_children()
if __name__ == "__main__":
test_main()