import errno import os import random import selectors import signal import socket import sys from test import support from time import sleep import unittest import unittest.mock import tempfile from time import monotonic 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() 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 make_socketpair(self): rd, wr = socketpair() self.addCleanup(rd.close) self.addCleanup(wr.close) return rd, wr def test_register(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() 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 = self.make_socketpair() 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_unregister_after_fd_close(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() r, w = rd.fileno(), wr.fileno() s.register(r, selectors.EVENT_READ) s.register(w, selectors.EVENT_WRITE) rd.close() wr.close() s.unregister(r) s.unregister(w) @unittest.skipUnless(os.name == 'posix', "requires posix") def test_unregister_after_fd_close_and_reuse(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() r, w = rd.fileno(), wr.fileno() s.register(r, selectors.EVENT_READ) s.register(w, selectors.EVENT_WRITE) rd2, wr2 = self.make_socketpair() rd.close() wr.close() os.dup2(rd2.fileno(), r) os.dup2(wr2.fileno(), w) self.addCleanup(os.close, r) self.addCleanup(os.close, w) s.unregister(r) s.unregister(w) def test_unregister_after_socket_close(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() s.register(rd, selectors.EVENT_READ) s.register(wr, selectors.EVENT_WRITE) rd.close() wr.close() s.unregister(rd) s.unregister(wr) def test_modify(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() 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) # modify use a shortcut d3 = object() s.register = unittest.mock.Mock() s.unregister = unittest.mock.Mock() s.modify(rd, selectors.EVENT_READ, d3) self.assertFalse(s.register.called) self.assertFalse(s.unregister.called) def test_modify_unregister(self): # Make sure the fd is unregister()ed in case of error on # modify(): http://bugs.python.org/issue30014 if self.SELECTOR.__name__ == 'EpollSelector': patch = unittest.mock.patch( 'selectors.EpollSelector._selector_cls') elif self.SELECTOR.__name__ == 'PollSelector': patch = unittest.mock.patch( 'selectors.PollSelector._selector_cls') elif self.SELECTOR.__name__ == 'DevpollSelector': patch = unittest.mock.patch( 'selectors.DevpollSelector._selector_cls') else: raise self.skipTest("") with patch as m: m.return_value.modify = unittest.mock.Mock( side_effect=ZeroDivisionError) s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() s.register(rd, selectors.EVENT_READ) self.assertEqual(len(s._map), 1) with self.assertRaises(ZeroDivisionError): s.modify(rd, selectors.EVENT_WRITE) self.assertEqual(len(s._map), 0) def test_close(self): s = self.SELECTOR() self.addCleanup(s.close) mapping = s.get_map() rd, wr = self.make_socketpair() s.register(rd, selectors.EVENT_READ) s.register(wr, selectors.EVENT_WRITE) s.close() self.assertRaises(RuntimeError, s.get_key, rd) self.assertRaises(RuntimeError, s.get_key, wr) self.assertRaises(KeyError, mapping.__getitem__, rd) self.assertRaises(KeyError, mapping.__getitem__, wr) def test_get_key(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() 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_get_map(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() keys = s.get_map() self.assertFalse(keys) self.assertEqual(len(keys), 0) self.assertEqual(list(keys), []) key = s.register(rd, selectors.EVENT_READ, "data") self.assertIn(rd, keys) self.assertEqual(key, keys[rd]) self.assertEqual(len(keys), 1) self.assertEqual(list(keys), [rd.fileno()]) self.assertEqual(list(keys.values()), [key]) # unknown file obj with self.assertRaises(KeyError): keys[999999] # Read-only mapping with self.assertRaises(TypeError): del keys[rd] def test_select(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() 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 = self.make_socketpair() with s as sel: sel.register(rd, selectors.EVENT_READ) sel.register(wr, selectors.EVENT_WRITE) self.assertRaises(RuntimeError, s.get_key, rd) self.assertRaises(RuntimeError, 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 = self.make_socketpair() 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) @unittest.skipIf(sys.platform == 'win32', 'select.select() cannot be used with empty fd sets') def test_empty_select(self): # Issue #23009: Make sure EpollSelector.select() works when no FD is # registered. s = self.SELECTOR() self.addCleanup(s.close) self.assertEqual(s.select(timeout=0), []) def test_timeout(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() s.register(wr, selectors.EVENT_WRITE) t = time() self.assertEqual(1, len(s.select(0))) self.assertEqual(1, len(s.select(-1))) self.assertLess(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.assertLess(time() - t, 0.5) t0 = time() self.assertFalse(s.select(1)) t1 = time() dt = t1 - t0 # Tolerate 2.0 seconds for very slow buildbots self.assertTrue(0.8 <= dt <= 2.0, dt) @unittest.skipUnless(hasattr(signal, "alarm"), "signal.alarm() required for this test") def test_select_interrupt_exc(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() class InterruptSelect(Exception): pass def handler(*args): raise InterruptSelect orig_alrm_handler = signal.signal(signal.SIGALRM, handler) self.addCleanup(signal.signal, signal.SIGALRM, orig_alrm_handler) try: signal.alarm(1) s.register(rd, selectors.EVENT_READ) t = time() # select() is interrupted by a signal which raises an exception with self.assertRaises(InterruptSelect): s.select(30) # select() was interrupted before the timeout of 30 seconds self.assertLess(time() - t, 5.0) finally: signal.alarm(0) @unittest.skipUnless(hasattr(signal, "alarm"), "signal.alarm() required for this test") def test_select_interrupt_noraise(self): s = self.SELECTOR() self.addCleanup(s.close) rd, wr = self.make_socketpair() orig_alrm_handler = signal.signal(signal.SIGALRM, lambda *args: None) self.addCleanup(signal.signal, signal.SIGALRM, orig_alrm_handler) try: signal.alarm(1) s.register(rd, selectors.EVENT_READ) t = time() # select() is interrupted by a signal, but the signal handler doesn't # raise an exception, so select() should by retries with a recomputed # timeout self.assertFalse(s.select(1.5)) self.assertGreaterEqual(time() - t, 1.0) finally: signal.alarm(0) 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 = min(hard, 2**16) 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 = self.make_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") 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 try: fds = s.select() except OSError as e: if e.errno == errno.EINVAL and sys.platform == 'darwin': # unexplainable errors on macOS don't need to fail the test self.skipTest("Invalid argument error calling poll()") raise self.assertEqual(NUM_FDS // 2, len(fds)) 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) def test_register_file(self): # epoll(7) returns EPERM when given a file to watch s = self.SELECTOR() with tempfile.NamedTemporaryFile() as f: with self.assertRaises(IOError): s.register(f, selectors.EVENT_READ) # the SelectorKey has been removed with self.assertRaises(KeyError): s.get_key(f) @unittest.skipUnless(hasattr(selectors, 'KqueueSelector'), "Test needs selectors.KqueueSelector)") class KqueueSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn): SELECTOR = getattr(selectors, 'KqueueSelector', None) def test_register_bad_fd(self): # a file descriptor that's been closed should raise an OSError # with EBADF s = self.SELECTOR() bad_f = support.make_bad_fd() with self.assertRaises(OSError) as cm: s.register(bad_f, selectors.EVENT_READ) self.assertEqual(cm.exception.errno, errno.EBADF) # the SelectorKey has been removed with self.assertRaises(KeyError): s.get_key(bad_f) @unittest.skipUnless(hasattr(selectors, 'DevpollSelector'), "Test needs selectors.DevpollSelector") class DevpollSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn): SELECTOR = getattr(selectors, 'DevpollSelector', None) def test_main(): tests = [DefaultSelectorTestCase, SelectSelectorTestCase, PollSelectorTestCase, EpollSelectorTestCase, KqueueSelectorTestCase, DevpollSelectorTestCase] support.run_unittest(*tests) support.reap_children() if __name__ == "__main__": test_main()