/usr/lib/python2.7/dist-packages/trollius/test_support.py is in python-trollius 2.1~b1-4.
This file is owned by root:root, with mode 0o644.
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# test suite. The code is copied from CPython 3.5 to not depend on the test
# module because it is rarely installed.
# Ignore symbol TEST_HOME_DIR: test_events works without it
from __future__ import absolute_import
import functools
import gc
import os
import platform
import re
import socket
import subprocess
import sys
import time
from trollius import test_utils
# A constant likely larger than the underlying OS pipe buffer size, to
# make writes blocking.
# Windows limit seems to be around 512 B, and many Unix kernels have a
# 64 KiB pipe buffer size or 16 * PAGE_SIZE: take a few megs to be sure.
# (see issue #17835 for a discussion of this number).
PIPE_MAX_SIZE = 4 * 1024 * 1024 + 1
def strip_python_stderr(stderr):
"""Strip the stderr of a Python process from potential debug output
emitted by the interpreter.
This will typically be run on the result of the communicate() method
of a subprocess.Popen object.
"""
stderr = re.sub(br"\[\d+ refs, \d+ blocks\]\r?\n?", b"", stderr).strip()
return stderr
# Executing the interpreter in a subprocess
def _assert_python(expected_success, *args, **env_vars):
if '__isolated' in env_vars:
isolated = env_vars.pop('__isolated')
else:
isolated = not env_vars
cmd_line = [sys.executable]
if sys.version_info >= (3, 3):
cmd_line.extend(('-X', 'faulthandler'))
if isolated and sys.version_info >= (3, 4):
# isolated mode: ignore Python environment variables, ignore user
# site-packages, and don't add the current directory to sys.path
cmd_line.append('-I')
elif not env_vars:
# ignore Python environment variables
cmd_line.append('-E')
# Need to preserve the original environment, for in-place testing of
# shared library builds.
env = os.environ.copy()
# But a special flag that can be set to override -- in this case, the
# caller is responsible to pass the full environment.
if env_vars.pop('__cleanenv', None):
env = {}
env.update(env_vars)
cmd_line.extend(args)
p = subprocess.Popen(cmd_line, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE,
env=env)
try:
out, err = p.communicate()
finally:
subprocess._cleanup()
p.stdout.close()
p.stderr.close()
rc = p.returncode
err = strip_python_stderr(err)
if (rc and expected_success) or (not rc and not expected_success):
raise AssertionError(
"Process return code is %d, "
"stderr follows:\n%s" % (rc, err.decode('ascii', 'ignore')))
return rc, out, err
def assert_python_ok(*args, **env_vars):
"""
Assert that running the interpreter with `args` and optional environment
variables `env_vars` succeeds (rc == 0) and return a (return code, stdout,
stderr) tuple.
If the __cleanenv keyword is set, env_vars is used a fresh environment.
Python is started in isolated mode (command line option -I),
except if the __isolated keyword is set to False.
"""
return _assert_python(True, *args, **env_vars)
is_jython = sys.platform.startswith('java')
def gc_collect():
"""Force as many objects as possible to be collected.
In non-CPython implementations of Python, this is needed because timely
deallocation is not guaranteed by the garbage collector. (Even in CPython
this can be the case in case of reference cycles.) This means that __del__
methods may be called later than expected and weakrefs may remain alive for
longer than expected. This function tries its best to force all garbage
objects to disappear.
"""
gc.collect()
if is_jython:
time.sleep(0.1)
gc.collect()
gc.collect()
HOST = "127.0.0.1"
HOSTv6 = "::1"
def _is_ipv6_enabled():
"""Check whether IPv6 is enabled on this host."""
if socket.has_ipv6:
sock = None
try:
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
sock.bind((HOSTv6, 0))
return True
except OSError:
pass
finally:
if sock:
sock.close()
return False
IPV6_ENABLED = _is_ipv6_enabled()
def find_unused_port(family=socket.AF_INET, socktype=socket.SOCK_STREAM):
"""Returns an unused port that should be suitable for binding. This is
achieved by creating a temporary socket with the same family and type as
the 'sock' parameter (default is AF_INET, SOCK_STREAM), and binding it to
the specified host address (defaults to 0.0.0.0) with the port set to 0,
eliciting an unused ephemeral port from the OS. The temporary socket is
then closed and deleted, and the ephemeral port is returned.
Either this method or bind_port() should be used for any tests where a
server socket needs to be bound to a particular port for the duration of
the test. Which one to use depends on whether the calling code is creating
a python socket, or if an unused port needs to be provided in a constructor
or passed to an external program (i.e. the -accept argument to openssl's
s_server mode). Always prefer bind_port() over find_unused_port() where
possible. Hard coded ports should *NEVER* be used. As soon as a server
socket is bound to a hard coded port, the ability to run multiple instances
of the test simultaneously on the same host is compromised, which makes the
test a ticking time bomb in a buildbot environment. On Unix buildbots, this
may simply manifest as a failed test, which can be recovered from without
intervention in most cases, but on Windows, the entire python process can
completely and utterly wedge, requiring someone to log in to the buildbot
and manually kill the affected process.
(This is easy to reproduce on Windows, unfortunately, and can be traced to
the SO_REUSEADDR socket option having different semantics on Windows versus
Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind,
listen and then accept connections on identical host/ports. An EADDRINUSE
OSError will be raised at some point (depending on the platform and
the order bind and listen were called on each socket).
However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE
will ever be raised when attempting to bind two identical host/ports. When
accept() is called on each socket, the second caller's process will steal
the port from the first caller, leaving them both in an awkwardly wedged
state where they'll no longer respond to any signals or graceful kills, and
must be forcibly killed via OpenProcess()/TerminateProcess().
The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option
instead of SO_REUSEADDR, which effectively affords the same semantics as
SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open
Source world compared to Windows ones, this is a common mistake. A quick
look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when
openssl.exe is called with the 's_server' option, for example. See
http://bugs.python.org/issue2550 for more info. The following site also
has a very thorough description about the implications of both REUSEADDR
and EXCLUSIVEADDRUSE on Windows:
http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
XXX: although this approach is a vast improvement on previous attempts to
elicit unused ports, it rests heavily on the assumption that the ephemeral
port returned to us by the OS won't immediately be dished back out to some
other process when we close and delete our temporary socket but before our
calling code has a chance to bind the returned port. We can deal with this
issue if/when we come across it.
"""
tempsock = socket.socket(family, socktype)
port = bind_port(tempsock)
tempsock.close()
del tempsock
return port
def bind_port(sock, host=HOST):
"""Bind the socket to a free port and return the port number. Relies on
ephemeral ports in order to ensure we are using an unbound port. This is
important as many tests may be running simultaneously, especially in a
buildbot environment. This method raises an exception if the sock.family
is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
or SO_REUSEPORT set on it. Tests should *never* set these socket options
for TCP/IP sockets. The only case for setting these options is testing
multicasting via multiple UDP sockets.
Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
on Windows), it will be set on the socket. This will prevent anyone else
from bind()'ing to our host/port for the duration of the test.
"""
if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
if hasattr(socket, 'SO_REUSEADDR'):
if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
raise TestFailed("tests should never set the SO_REUSEADDR "
"socket option on TCP/IP sockets!")
if hasattr(socket, 'SO_REUSEPORT'):
try:
reuse = sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT)
if reuse == 1:
raise TestFailed("tests should never set the SO_REUSEPORT "
"socket option on TCP/IP sockets!")
except OSError:
# Python's socket module was compiled using modern headers
# thus defining SO_REUSEPORT but this process is running
# under an older kernel that does not support SO_REUSEPORT.
pass
if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
sock.bind((host, 0))
port = sock.getsockname()[1]
return port
def requires_mac_ver(*min_version):
"""Decorator raising SkipTest if the OS is Mac OS X and the OS X
version if less than min_version.
For example, @requires_mac_ver(10, 5) raises SkipTest if the OS X version
is lesser than 10.5.
"""
def decorator(func):
@functools.wraps(func)
def wrapper(*args, **kw):
if sys.platform == 'darwin':
version_txt = platform.mac_ver()[0]
try:
version = tuple(map(int, version_txt.split('.')))
except ValueError:
pass
else:
if version < min_version:
min_version_txt = '.'.join(map(str, min_version))
raise test_utils.SkipTest(
"Mac OS X %s or higher required, not %s"
% (min_version_txt, version_txt))
return func(*args, **kw)
wrapper.min_version = min_version
return wrapper
return decorator
def _requires_unix_version(sysname, min_version):
"""Decorator raising SkipTest if the OS is `sysname` and the version is
less than `min_version`.
For example, @_requires_unix_version('FreeBSD', (7, 2)) raises SkipTest if
the FreeBSD version is less than 7.2.
"""
def decorator(func):
@functools.wraps(func)
def wrapper(*args, **kw):
if platform.system() == sysname:
version_txt = platform.release().split('-', 1)[0]
try:
version = tuple(map(int, version_txt.split('.')))
except ValueError:
pass
else:
if version < min_version:
min_version_txt = '.'.join(map(str, min_version))
raise test_utils.SkipTest(
"%s version %s or higher required, not %s"
% (sysname, min_version_txt, version_txt))
return func(*args, **kw)
wrapper.min_version = min_version
return wrapper
return decorator
def requires_freebsd_version(*min_version):
"""Decorator raising SkipTest if the OS is FreeBSD and the FreeBSD version
is less than `min_version`.
For example, @requires_freebsd_version(7, 2) raises SkipTest if the FreeBSD
version is less than 7.2.
"""
return _requires_unix_version('FreeBSD', min_version)
# Use test.support if available
try:
from test.support import *
except ImportError:
pass
# Use test.script_helper if available
try:
from test.script_helper import assert_python_ok
except ImportError:
pass
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