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python3.6
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test_utils.py
"""Utilities shared by tests.""" import collections import contextlib import io import logging import os import re import socket import socketserver import sys import tempfile import threading import time import unittest import weakref from unittest import mock from http.server import HTTPServer from wsgiref.simple_server import WSGIRequestHandler, WSGIServer try: import ssl except ImportError: # pragma: no cover ssl = None from . import base_events from . import compat from . import events from . import futures from . import selectors from . import tasks from .coroutines import coroutine from .log import logger from test import support if sys.platform == 'win32': # pragma: no cover from .windows_utils import socketpair else: from socket import socketpair # pragma: no cover def data_file(filename): if hasattr(support, 'TEST_HOME_DIR'): fullname = os.path.join(support.TEST_HOME_DIR, filename) if os.path.isfile(fullname): return fullname fullname = os.path.join(os.path.dirname(os.__file__), 'test', filename) if os.path.isfile(fullname): return fullname raise FileNotFoundError(filename) ONLYCERT = data_file('ssl_cert.pem') ONLYKEY = data_file('ssl_key.pem') def dummy_ssl_context(): if ssl is None: return None else: return ssl.SSLContext(ssl.PROTOCOL_SSLv23) def run_briefly(loop): @coroutine def once(): pass gen = once() t = loop.create_task(gen) # Don't log a warning if the task is not done after run_until_complete(). # It occurs if the loop is stopped or if a task raises a BaseException. t._log_destroy_pending = False try: loop.run_until_complete(t) finally: gen.close() def run_until(loop, pred, timeout=30): deadline = time.time() + timeout while not pred(): if timeout is not None: timeout = deadline - time.time() if timeout <= 0: raise futures.TimeoutError() loop.run_until_complete(tasks.sleep(0.001, loop=loop)) def run_once(loop): """Legacy API to run once through the event loop. This is the recommended pattern for test code. It will poll the selector once and run all callbacks scheduled in response to I/O events. """ loop.call_soon(loop.stop) loop.run_forever() class SilentWSGIRequestHandler(WSGIRequestHandler): def get_stderr(self): return io.StringIO() def log_message(self, format, *args): pass class SilentWSGIServer(WSGIServer): request_timeout = 2 def get_request(self): request, client_addr = super().get_request() request.settimeout(self.request_timeout) return request, client_addr def handle_error(self, request, client_address): pass class SSLWSGIServerMixin: def finish_request(self, request, client_address): # The relative location of our test directory (which # contains the ssl key and certificate files) differs # between the stdlib and stand-alone asyncio. # Prefer our own if we can find it. keyfile = ONLYKEY certfile = ONLYCERT context = ssl.SSLContext() context.load_cert_chain(certfile, keyfile) ssock = context.wrap_socket(request, server_side=True) try: self.RequestHandlerClass(ssock, client_address, self) ssock.close() except OSError: # maybe socket has been closed by peer pass class SSLWSGIServer(SSLWSGIServerMixin, SilentWSGIServer): pass def _run_test_server(*, address, use_ssl=False, server_cls, server_ssl_cls): def app(environ, start_response): status = '200 OK' headers = [('Content-type', 'text/plain')] start_response(status, headers) return [b'Test message'] # Run the test WSGI server in a separate thread in order not to # interfere with event handling in the main thread server_class = server_ssl_cls if use_ssl else server_cls httpd = server_class(address, SilentWSGIRequestHandler) httpd.set_app(app) httpd.address = httpd.server_address server_thread = threading.Thread( target=lambda: httpd.serve_forever(poll_interval=0.05)) server_thread.start() try: yield httpd finally: httpd.shutdown() httpd.server_close() server_thread.join() if hasattr(socket, 'AF_UNIX'): class UnixHTTPServer(socketserver.UnixStreamServer, HTTPServer): def server_bind(self): socketserver.UnixStreamServer.server_bind(self) self.server_name = '127.0.0.1' self.server_port = 80 class UnixWSGIServer(UnixHTTPServer, WSGIServer): request_timeout = 2 def server_bind(self): UnixHTTPServer.server_bind(self) self.setup_environ() def get_request(self): request, client_addr = super().get_request() request.settimeout(self.request_timeout) # Code in the stdlib expects that get_request # will return a socket and a tuple (host, port). # However, this isn't true for UNIX sockets, # as the second return value will be a path; # hence we return some fake data sufficient # to get the tests going return request, ('127.0.0.1', '') class SilentUnixWSGIServer(UnixWSGIServer): def handle_error(self, request, client_address): pass class UnixSSLWSGIServer(SSLWSGIServerMixin, SilentUnixWSGIServer): pass def gen_unix_socket_path(): with tempfile.NamedTemporaryFile() as file: return file.name @contextlib.contextmanager def unix_socket_path(): path = gen_unix_socket_path() try: yield path finally: try: os.unlink(path) except OSError: pass @contextlib.contextmanager def run_test_unix_server(*, use_ssl=False): with unix_socket_path() as path: yield from _run_test_server(address=path, use_ssl=use_ssl, server_cls=SilentUnixWSGIServer, server_ssl_cls=UnixSSLWSGIServer) @contextlib.contextmanager def run_test_server(*, host='127.0.0.1', port=0, use_ssl=False): yield from _run_test_server(address=(host, port), use_ssl=use_ssl, server_cls=SilentWSGIServer, server_ssl_cls=SSLWSGIServer) def make_test_protocol(base): dct = {} for name in dir(base): if name.startswith('__') and name.endswith('__'): # skip magic names continue dct[name] = MockCallback(return_value=None) return type('TestProtocol', (base,) + base.__bases__, dct)() class TestSelector(selectors.BaseSelector): def __init__(self): self.keys = {} def register(self, fileobj, events, data=None): key = selectors.SelectorKey(fileobj, 0, events, data) self.keys[fileobj] = key return key def unregister(self, fileobj): return self.keys.pop(fileobj) def select(self, timeout): return [] def get_map(self): return self.keys class TestLoop(base_events.BaseEventLoop): """Loop for unittests. It manages self time directly. If something scheduled to be executed later then on next loop iteration after all ready handlers done generator passed to __init__ is calling. Generator should be like this: def gen(): ... when = yield ... ... = yield time_advance Value returned by yield is absolute time of next scheduled handler. Value passed to yield is time advance to move loop's time forward. """ def __init__(self, gen=None): super().__init__() if gen is None: def gen(): yield self._check_on_close = False else: self._check_on_close = True self._gen = gen() next(self._gen) self._time = 0 self._clock_resolution = 1e-9 self._timers = [] self._selector = TestSelector() self.readers = {} self.writers = {} self.reset_counters() self._transports = weakref.WeakValueDictionary() def time(self): return self._time def advance_time(self, advance): """Move test time forward.""" if advance: self._time += advance def close(self): super().close() if self._check_on_close: try: self._gen.send(0) except StopIteration: pass else: # pragma: no cover raise AssertionError("Time generator is not finished") def _add_reader(self, fd, callback, *args): self.readers[fd] = events.Handle(callback, args, self) def _remove_reader(self, fd): self.remove_reader_count[fd] += 1 if fd in self.readers: del self.readers[fd] return True else: return False def assert_reader(self, fd, callback, *args): if fd not in self.readers: raise AssertionError(f'fd {fd} is not registered') handle = self.readers[fd] if handle._callback != callback: raise AssertionError( f'unexpected callback: {handle._callback} != {callback}') if handle._args != args: raise AssertionError( f'unexpected callback args: {handle._args} != {args}') def assert_no_reader(self, fd): if fd in self.readers: raise AssertionError(f'fd {fd} is registered') def _add_writer(self, fd, callback, *args): self.writers[fd] = events.Handle(callback, args, self) def _remove_writer(self, fd): self.remove_writer_count[fd] += 1 if fd in self.writers: del self.writers[fd] return True else: return False def assert_writer(self, fd, callback, *args): assert fd in self.writers, 'fd {} is not registered'.format(fd) handle = self.writers[fd] assert handle._callback == callback, '{!r} != {!r}'.format( handle._callback, callback) assert handle._args == args, '{!r} != {!r}'.format( handle._args, args) def _ensure_fd_no_transport(self, fd): try: transport = self._transports[fd] except KeyError: pass else: raise RuntimeError( 'File descriptor {!r} is used by transport {!r}'.format( fd, transport)) def add_reader(self, fd, callback, *args): """Add a reader callback.""" self._ensure_fd_no_transport(fd) return self._add_reader(fd, callback, *args) def remove_reader(self, fd): """Remove a reader callback.""" self._ensure_fd_no_transport(fd) return self._remove_reader(fd) def add_writer(self, fd, callback, *args): """Add a writer callback..""" self._ensure_fd_no_transport(fd) return self._add_writer(fd, callback, *args) def remove_writer(self, fd): """Remove a writer callback.""" self._ensure_fd_no_transport(fd) return self._remove_writer(fd) def reset_counters(self): self.remove_reader_count = collections.defaultdict(int) self.remove_writer_count = collections.defaultdict(int) def _run_once(self): super()._run_once() for when in self._timers: advance = self._gen.send(when) self.advance_time(advance) self._timers = [] def call_at(self, when, callback, *args): self._timers.append(when) return super().call_at(when, callback, *args) def _process_events(self, event_list): return def _write_to_self(self): pass def MockCallback(**kwargs): return mock.Mock(spec=['__call__'], **kwargs) class MockPattern(str): """A regex based str with a fuzzy __eq__. Use this helper with 'mock.assert_called_with', or anywhere where a regex comparison between strings is needed. For instance: mock_call.assert_called_with(MockPattern('spam.*ham')) """ def __eq__(self, other): return bool(re.search(str(self), other, re.S)) def get_function_source(func): source = events._get_function_source(func) if source is None: raise ValueError("unable to get the source of %r" % (func,)) return source class TestCase(unittest.TestCase): @staticmethod def close_loop(loop): executor = loop._default_executor if executor is not None: executor.shutdown(wait=True) loop.close() def set_event_loop(self, loop, *, cleanup=True): assert loop is not None # ensure that the event loop is passed explicitly in asyncio events.set_event_loop(None) if cleanup: self.addCleanup(self.close_loop, loop) def new_test_loop(self, gen=None): loop = TestLoop(gen) self.set_event_loop(loop) return loop def unpatch_get_running_loop(self): events._get_running_loop = self._get_running_loop def setUp(self): self._get_running_loop = events._get_running_loop events._get_running_loop = lambda: None self._thread_cleanup = support.threading_setup() def tearDown(self): self.unpatch_get_running_loop() events.set_event_loop(None) # Detect CPython bug #23353: ensure that yield/yield-from is not used # in an except block of a generator self.assertEqual(sys.exc_info(), (None, None, None)) self.doCleanups() support.threading_cleanup(*self._thread_cleanup) support.reap_children() if not compat.PY34: # Python 3.3 compatibility def subTest(self, *args, **kwargs): class EmptyCM: def __enter__(self): pass def __exit__(self, *exc): pass return EmptyCM() @contextlib.contextmanager def disable_logger(): """Context manager to disable asyncio logger. For example, it can be used to ignore warnings in debug mode. """ old_level = logger.level try: logger.setLevel(logging.CRITICAL+1) yield finally: logger.setLevel(old_level) def mock_nonblocking_socket(proto=socket.IPPROTO_TCP, type=socket.SOCK_STREAM, family=socket.AF_INET): """Create a mock of a non-blocking socket.""" sock = mock.MagicMock(socket.socket) sock.proto = proto sock.type = type sock.family = family sock.gettimeout.return_value = 0.0 return sock def force_legacy_ssl_support(): return mock.patch('asyncio.sslproto._is_sslproto_available', return_value=False)
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