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