722 lines
26 KiB
Python
722 lines
26 KiB
Python
"""Supporting definitions for the Python regression tests."""
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if __name__ != 'test.test_support':
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raise ImportError('test_support must be imported from the test package')
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import contextlib
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import errno
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import socket
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import sys
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import os
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import os.path
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import shutil
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import warnings
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import unittest
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class Error(Exception):
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"""Base class for regression test exceptions."""
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class TestFailed(Error):
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"""Test failed."""
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class TestSkipped(Error):
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"""Test skipped.
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This can be raised to indicate that a test was deliberatly
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skipped, but not because a feature wasn't available. For
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example, if some resource can't be used, such as the network
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appears to be unavailable, this should be raised instead of
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TestFailed.
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"""
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class ResourceDenied(TestSkipped):
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"""Test skipped because it requested a disallowed resource.
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This is raised when a test calls requires() for a resource that
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has not be enabled. It is used to distinguish between expected
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and unexpected skips.
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"""
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verbose = 1 # Flag set to 0 by regrtest.py
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use_resources = None # Flag set to [] by regrtest.py
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max_memuse = 0 # Disable bigmem tests (they will still be run with
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# small sizes, to make sure they work.)
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# _original_stdout is meant to hold stdout at the time regrtest began.
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# This may be "the real" stdout, or IDLE's emulation of stdout, or whatever.
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# The point is to have some flavor of stdout the user can actually see.
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_original_stdout = None
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def record_original_stdout(stdout):
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global _original_stdout
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_original_stdout = stdout
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def get_original_stdout():
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return _original_stdout or sys.stdout
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def unload(name):
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try:
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del sys.modules[name]
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except KeyError:
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pass
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def unlink(filename):
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try:
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os.unlink(filename)
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except OSError:
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pass
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def rmtree(path):
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try:
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shutil.rmtree(path)
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except OSError as e:
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# Unix returns ENOENT, Windows returns ESRCH.
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if e.errno not in (errno.ENOENT, errno.ESRCH):
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raise
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def forget(modname):
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'''"Forget" a module was ever imported by removing it from sys.modules and
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deleting any .pyc and .pyo files.'''
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unload(modname)
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for dirname in sys.path:
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unlink(os.path.join(dirname, modname + '.pyc'))
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# Deleting the .pyo file cannot be within the 'try' for the .pyc since
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# the chance exists that there is no .pyc (and thus the 'try' statement
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# is exited) but there is a .pyo file.
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unlink(os.path.join(dirname, modname + '.pyo'))
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def is_resource_enabled(resource):
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"""Test whether a resource is enabled. Known resources are set by
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regrtest.py."""
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return use_resources is not None and resource in use_resources
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def requires(resource, msg=None):
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"""Raise ResourceDenied if the specified resource is not available.
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If the caller's module is __main__ then automatically return True. The
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possibility of False being returned occurs when regrtest.py is executing."""
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# see if the caller's module is __main__ - if so, treat as if
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# the resource was set
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if sys._getframe().f_back.f_globals.get("__name__") == "__main__":
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return
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if not is_resource_enabled(resource):
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if msg is None:
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msg = "Use of the `%s' resource not enabled" % resource
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raise ResourceDenied(msg)
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HOST = 'localhost'
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def find_unused_port(family=socket.AF_INET, socktype=socket.SOCK_STREAM):
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"""Returns an unused port that should be suitable for binding. This is
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achieved by creating a temporary socket with the same family and type as
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the 'sock' parameter (default is AF_INET, SOCK_STREAM), and binding it to
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the specified host address (defaults to 0.0.0.0) with the port set to 0,
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eliciting an unused ephemeral port from the OS. The temporary socket is
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then closed and deleted, and the ephemeral port is returned.
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Either this method or bind_port() should be used for any tests where a
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server socket needs to be bound to a particular port for the duration of
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the test. Which one to use depends on whether the calling code is creating
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a python socket, or if an unused port needs to be provided in a constructor
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or passed to an external program (i.e. the -accept argument to openssl's
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s_server mode). Always prefer bind_port() over find_unused_port() where
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possible. Hard coded ports should *NEVER* be used. As soon as a server
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socket is bound to a hard coded port, the ability to run multiple instances
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of the test simultaneously on the same host is compromised, which makes the
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test a ticking time bomb in a buildbot environment. On Unix buildbots, this
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may simply manifest as a failed test, which can be recovered from without
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intervention in most cases, but on Windows, the entire python process can
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completely and utterly wedge, requiring someone to log in to the buildbot
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and manually kill the affected process.
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(This is easy to reproduce on Windows, unfortunately, and can be traced to
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the SO_REUSEADDR socket option having different semantics on Windows versus
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Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind,
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listen and then accept connections on identical host/ports. An EADDRINUSE
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socket.error will be raised at some point (depending on the platform and
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the order bind and listen were called on each socket).
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However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE
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will ever be raised when attempting to bind two identical host/ports. When
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accept() is called on each socket, the second caller's process will steal
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the port from the first caller, leaving them both in an awkwardly wedged
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state where they'll no longer respond to any signals or graceful kills, and
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must be forcibly killed via OpenProcess()/TerminateProcess().
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The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option
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instead of SO_REUSEADDR, which effectively affords the same semantics as
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SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open
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Source world compared to Windows ones, this is a common mistake. A quick
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look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when
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openssl.exe is called with the 's_server' option, for example. See
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http://bugs.python.org/issue2550 for more info. The following site also
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has a very thorough description about the implications of both REUSEADDR
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and EXCLUSIVEADDRUSE on Windows:
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http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
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XXX: although this approach is a vast improvement on previous attempts to
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elicit unused ports, it rests heavily on the assumption that the ephemeral
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port returned to us by the OS won't immediately be dished back out to some
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other process when we close and delete our temporary socket but before our
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calling code has a chance to bind the returned port. We can deal with this
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issue if/when we come across it.
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"""
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tempsock = socket.socket(family, socktype)
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port = bind_port(tempsock)
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tempsock.close()
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del tempsock
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return port
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def bind_port(sock, host=HOST):
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"""Bind the socket to a free port and return the port number. Relies on
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ephemeral ports in order to ensure we are using an unbound port. This is
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important as many tests may be running simultaneously, especially in a
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buildbot environment. This method raises an exception if the sock.family
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is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
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or SO_REUSEPORT set on it. Tests should *never* set these socket options
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for TCP/IP sockets. The only case for setting these options is testing
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multicasting via multiple UDP sockets.
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Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
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on Windows), it will be set on the socket. This will prevent anyone else
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from bind()'ing to our host/port for the duration of the test.
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"""
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if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
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if hasattr(socket, 'SO_REUSEADDR'):
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if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
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raise TestFailed("tests should never set the SO_REUSEADDR " \
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"socket option on TCP/IP sockets!")
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if hasattr(socket, 'SO_REUSEPORT'):
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if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
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raise TestFailed("tests should never set the SO_REUSEPORT " \
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"socket option on TCP/IP sockets!")
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if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
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sock.bind((host, 0))
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port = sock.getsockname()[1]
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return port
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FUZZ = 1e-6
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def fcmp(x, y): # fuzzy comparison function
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if isinstance(x, float) or isinstance(y, float):
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try:
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fuzz = (abs(x) + abs(y)) * FUZZ
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if abs(x-y) <= fuzz:
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return 0
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except:
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pass
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elif type(x) == type(y) and isinstance(x, (tuple, list)):
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for i in range(min(len(x), len(y))):
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outcome = fcmp(x[i], y[i])
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if outcome != 0:
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return outcome
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return (len(x) > len(y)) - (len(x) < len(y))
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return (x > y) - (x < y)
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try:
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str
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have_unicode = True
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except NameError:
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have_unicode = False
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is_jython = sys.platform.startswith('java')
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# Filename used for testing
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if os.name == 'java':
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# Jython disallows @ in module names
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TESTFN = '$test'
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else:
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TESTFN = '@test'
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# Assuming sys.getfilesystemencoding()!=sys.getdefaultencoding()
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# TESTFN_UNICODE is a filename that can be encoded using the
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# file system encoding, but *not* with the default (ascii) encoding
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TESTFN_UNICODE = "@test-\xe0\xf2"
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TESTFN_ENCODING = sys.getfilesystemencoding()
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# TESTFN_UNICODE_UNENCODEABLE is a filename that should *not* be
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# able to be encoded by *either* the default or filesystem encoding.
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# This test really only makes sense on Windows NT platforms
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# which have special Unicode support in posixmodule.
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if (not hasattr(sys, "getwindowsversion") or
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sys.getwindowsversion()[3] < 2): # 0=win32s or 1=9x/ME
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TESTFN_UNICODE_UNENCODEABLE = None
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else:
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# Japanese characters (I think - from bug 846133)
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TESTFN_UNICODE_UNENCODEABLE = "@test-\u5171\u6709\u3055\u308c\u308b"
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try:
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# XXX - Note - should be using TESTFN_ENCODING here - but for
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# Windows, "mbcs" currently always operates as if in
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# errors=ignore' mode - hence we get '?' characters rather than
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# the exception. 'Latin1' operates as we expect - ie, fails.
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# See [ 850997 ] mbcs encoding ignores errors
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TESTFN_UNICODE_UNENCODEABLE.encode("Latin1")
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except UnicodeEncodeError:
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pass
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else:
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print('WARNING: The filename %r CAN be encoded by the filesystem. '
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'Unicode filename tests may not be effective'
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% TESTFN_UNICODE_UNENCODEABLE)
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# Make sure we can write to TESTFN, try in /tmp if we can't
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fp = None
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try:
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fp = open(TESTFN, 'w+')
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except IOError:
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TMP_TESTFN = os.path.join('/tmp', TESTFN)
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try:
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fp = open(TMP_TESTFN, 'w+')
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TESTFN = TMP_TESTFN
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del TMP_TESTFN
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except IOError:
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print(('WARNING: tests will fail, unable to write to: %s or %s' %
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(TESTFN, TMP_TESTFN)))
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if fp is not None:
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fp.close()
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unlink(TESTFN)
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del fp
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def findfile(file, here=__file__):
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"""Try to find a file on sys.path and the working directory. If it is not
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found the argument passed to the function is returned (this does not
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necessarily signal failure; could still be the legitimate path)."""
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if os.path.isabs(file):
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return file
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path = sys.path
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path = [os.path.dirname(here)] + path
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for dn in path:
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fn = os.path.join(dn, file)
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if os.path.exists(fn): return fn
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return file
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def verify(condition, reason='test failed'):
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"""Verify that condition is true. If not, raise TestFailed.
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The optional argument reason can be given to provide
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a better error text.
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"""
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if not condition:
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raise TestFailed(reason)
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def vereq(a, b):
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"""Raise TestFailed if a == b is false.
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This is better than verify(a == b) because, in case of failure, the
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error message incorporates repr(a) and repr(b) so you can see the
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inputs.
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Note that "not (a == b)" isn't necessarily the same as "a != b"; the
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former is tested.
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"""
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if not (a == b):
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raise TestFailed("%r == %r" % (a, b))
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def sortdict(dict):
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"Like repr(dict), but in sorted order."
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items = sorted(dict.items())
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reprpairs = ["%r: %r" % pair for pair in items]
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withcommas = ", ".join(reprpairs)
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return "{%s}" % withcommas
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def check_syntax_error(testcase, statement):
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try:
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compile(statement, '<test string>', 'exec')
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except SyntaxError:
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pass
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else:
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testcase.fail('Missing SyntaxError: "%s"' % statement)
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def open_urlresource(url, *args, **kw):
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import urllib, urlparse
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requires('urlfetch')
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filename = urlparse.urlparse(url)[2].split('/')[-1] # '/': it's URL!
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for path in [os.path.curdir, os.path.pardir]:
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fn = os.path.join(path, filename)
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if os.path.exists(fn):
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return open(fn, *args, **kw)
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print('\tfetching %s ...' % url, file=get_original_stdout())
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fn, _ = urllib.urlretrieve(url, filename)
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return open(fn, *args, **kw)
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class WarningMessage(object):
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"Holds the result of the latest showwarning() call"
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def __init__(self):
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self.message = None
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self.category = None
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self.filename = None
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self.lineno = None
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def _showwarning(self, message, category, filename, lineno, file=None,
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line=None):
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self.message = message
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self.category = category
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self.filename = filename
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self.lineno = lineno
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self.line = line
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def reset(self):
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self._showwarning(*((None,)*6))
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def __str__(self):
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return ("{message : %r, category : %r, filename : %r, lineno : %s, "
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"line : %r}" % (self.message,
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self.category.__name__ if self.category else None,
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self.filename, self.lineno, self.line))
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@contextlib.contextmanager
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def catch_warning(module=warnings):
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"""
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Guard the warnings filter from being permanently changed and record the
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data of the last warning that has been issued.
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Use like this:
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with catch_warning() as w:
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warnings.warn("foo")
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assert str(w.message) == "foo"
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"""
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warning_obj = WarningMessage()
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original_filters = module.filters[:]
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original_showwarning = module.showwarning
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module.showwarning = warning_obj._showwarning
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try:
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yield warning_obj
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finally:
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module.showwarning = original_showwarning
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module.filters = original_filters
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class EnvironmentVarGuard(object):
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"""Class to help protect the environment variable properly. Can be used as
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a context manager."""
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def __init__(self):
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self._environ = os.environ
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self._unset = set()
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self._reset = dict()
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def set(self, envvar, value):
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if envvar not in self._environ:
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self._unset.add(envvar)
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else:
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self._reset[envvar] = self._environ[envvar]
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self._environ[envvar] = value
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def unset(self, envvar):
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if envvar in self._environ:
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self._reset[envvar] = self._environ[envvar]
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del self._environ[envvar]
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def __enter__(self):
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return self
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def __exit__(self, *ignore_exc):
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for envvar, value in self._reset.items():
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self._environ[envvar] = value
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for unset in self._unset:
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del self._environ[unset]
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class TransientResource(object):
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"""Raise ResourceDenied if an exception is raised while the context manager
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is in effect that matches the specified exception and attributes."""
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def __init__(self, exc, **kwargs):
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self.exc = exc
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self.attrs = kwargs
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def __enter__(self):
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return self
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def __exit__(self, type_=None, value=None, traceback=None):
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"""If type_ is a subclass of self.exc and value has attributes matching
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self.attrs, raise ResourceDenied. Otherwise let the exception
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propagate (if any)."""
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if type_ is not None and issubclass(self.exc, type_):
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for attr, attr_value in self.attrs.items():
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if not hasattr(value, attr):
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break
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if getattr(value, attr) != attr_value:
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break
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else:
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raise ResourceDenied("an optional resource is not available")
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def transient_internet():
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"""Return a context manager that raises ResourceDenied when various issues
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with the Internet connection manifest themselves as exceptions."""
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time_out = TransientResource(IOError, errno=errno.ETIMEDOUT)
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socket_peer_reset = TransientResource(socket.error, errno=errno.ECONNRESET)
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ioerror_peer_reset = TransientResource(IOError, errno=errno.ECONNRESET)
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return contextlib.nested(time_out, socket_peer_reset, ioerror_peer_reset)
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@contextlib.contextmanager
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def captured_output(stream_name):
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"""Run the 'with' statement body using a StringIO object in place of a
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specific attribute on the sys module.
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Example use (with 'stream_name=stdout')::
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with captured_stdout() as s:
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print "hello"
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assert s.getvalue() == "hello"
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"""
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import io
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orig_stdout = getattr(sys, stream_name)
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setattr(sys, stream_name, io.StringIO())
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try:
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yield getattr(sys, stream_name)
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finally:
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setattr(sys, stream_name, orig_stdout)
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def captured_stdout():
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return captured_output("stdout")
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#=======================================================================
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# Decorator for running a function in a different locale, correctly resetting
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# it afterwards.
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def run_with_locale(catstr, *locales):
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def decorator(func):
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def inner(*args, **kwds):
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try:
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import locale
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category = getattr(locale, catstr)
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orig_locale = locale.setlocale(category)
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except AttributeError:
|
|
# if the test author gives us an invalid category string
|
|
raise
|
|
except:
|
|
# cannot retrieve original locale, so do nothing
|
|
locale = orig_locale = None
|
|
else:
|
|
for loc in locales:
|
|
try:
|
|
locale.setlocale(category, loc)
|
|
break
|
|
except:
|
|
pass
|
|
|
|
# now run the function, resetting the locale on exceptions
|
|
try:
|
|
return func(*args, **kwds)
|
|
finally:
|
|
if locale and orig_locale:
|
|
locale.setlocale(category, orig_locale)
|
|
inner.__name__ = func.__name__
|
|
inner.__doc__ = func.__doc__
|
|
return inner
|
|
return decorator
|
|
|
|
#=======================================================================
|
|
# Big-memory-test support. Separate from 'resources' because memory use
|
|
# should be configurable.
|
|
|
|
# Some handy shorthands. Note that these are used for byte-limits as well
|
|
# as size-limits, in the various bigmem tests
|
|
_1M = 1024*1024
|
|
_1G = 1024 * _1M
|
|
_2G = 2 * _1G
|
|
|
|
MAX_Py_ssize_t = sys.maxsize
|
|
|
|
def set_memlimit(limit):
|
|
import re
|
|
global max_memuse
|
|
sizes = {
|
|
'k': 1024,
|
|
'm': _1M,
|
|
'g': _1G,
|
|
't': 1024*_1G,
|
|
}
|
|
m = re.match(r'(\d+(\.\d+)?) (K|M|G|T)b?$', limit,
|
|
re.IGNORECASE | re.VERBOSE)
|
|
if m is None:
|
|
raise ValueError('Invalid memory limit %r' % (limit,))
|
|
memlimit = int(float(m.group(1)) * sizes[m.group(3).lower()])
|
|
if memlimit > MAX_Py_ssize_t:
|
|
memlimit = MAX_Py_ssize_t
|
|
if memlimit < _2G - 1:
|
|
raise ValueError('Memory limit %r too low to be useful' % (limit,))
|
|
max_memuse = memlimit
|
|
|
|
def bigmemtest(minsize, memuse, overhead=5*_1M):
|
|
"""Decorator for bigmem tests.
|
|
|
|
'minsize' is the minimum useful size for the test (in arbitrary,
|
|
test-interpreted units.) 'memuse' is the number of 'bytes per size' for
|
|
the test, or a good estimate of it. 'overhead' specifies fixed overhead,
|
|
independent of the testsize, and defaults to 5Mb.
|
|
|
|
The decorator tries to guess a good value for 'size' and passes it to
|
|
the decorated test function. If minsize * memuse is more than the
|
|
allowed memory use (as defined by max_memuse), the test is skipped.
|
|
Otherwise, minsize is adjusted upward to use up to max_memuse.
|
|
"""
|
|
def decorator(f):
|
|
def wrapper(self):
|
|
if not max_memuse:
|
|
# If max_memuse is 0 (the default),
|
|
# we still want to run the tests with size set to a few kb,
|
|
# to make sure they work. We still want to avoid using
|
|
# too much memory, though, but we do that noisily.
|
|
maxsize = 5147
|
|
self.failIf(maxsize * memuse + overhead > 20 * _1M)
|
|
else:
|
|
maxsize = int((max_memuse - overhead) / memuse)
|
|
if maxsize < minsize:
|
|
# Really ought to print 'test skipped' or something
|
|
if verbose:
|
|
sys.stderr.write("Skipping %s because of memory "
|
|
"constraint\n" % (f.__name__,))
|
|
return
|
|
# Try to keep some breathing room in memory use
|
|
maxsize = max(maxsize - 50 * _1M, minsize)
|
|
return f(self, maxsize)
|
|
wrapper.minsize = minsize
|
|
wrapper.memuse = memuse
|
|
wrapper.overhead = overhead
|
|
return wrapper
|
|
return decorator
|
|
|
|
def bigaddrspacetest(f):
|
|
"""Decorator for tests that fill the address space."""
|
|
def wrapper(self):
|
|
if max_memuse < MAX_Py_ssize_t:
|
|
if verbose:
|
|
sys.stderr.write("Skipping %s because of memory "
|
|
"constraint\n" % (f.__name__,))
|
|
else:
|
|
return f(self)
|
|
return wrapper
|
|
|
|
#=======================================================================
|
|
# unittest integration.
|
|
|
|
class BasicTestRunner:
|
|
def run(self, test):
|
|
result = unittest.TestResult()
|
|
test(result)
|
|
return result
|
|
|
|
|
|
def _run_suite(suite):
|
|
"""Run tests from a unittest.TestSuite-derived class."""
|
|
if verbose:
|
|
runner = unittest.TextTestRunner(sys.stdout, verbosity=2)
|
|
else:
|
|
runner = BasicTestRunner()
|
|
|
|
result = runner.run(suite)
|
|
if not result.wasSuccessful():
|
|
if len(result.errors) == 1 and not result.failures:
|
|
err = result.errors[0][1]
|
|
elif len(result.failures) == 1 and not result.errors:
|
|
err = result.failures[0][1]
|
|
else:
|
|
err = "errors occurred; run in verbose mode for details"
|
|
raise TestFailed(err)
|
|
|
|
|
|
def run_unittest(*classes):
|
|
"""Run tests from unittest.TestCase-derived classes."""
|
|
valid_types = (unittest.TestSuite, unittest.TestCase)
|
|
suite = unittest.TestSuite()
|
|
for cls in classes:
|
|
if isinstance(cls, str):
|
|
if cls in sys.modules:
|
|
suite.addTest(unittest.findTestCases(sys.modules[cls]))
|
|
else:
|
|
raise ValueError("str arguments must be keys in sys.modules")
|
|
elif isinstance(cls, valid_types):
|
|
suite.addTest(cls)
|
|
else:
|
|
suite.addTest(unittest.makeSuite(cls))
|
|
_run_suite(suite)
|
|
|
|
|
|
#=======================================================================
|
|
# doctest driver.
|
|
|
|
def run_doctest(module, verbosity=None):
|
|
"""Run doctest on the given module. Return (#failures, #tests).
|
|
|
|
If optional argument verbosity is not specified (or is None), pass
|
|
test_support's belief about verbosity on to doctest. Else doctest's
|
|
usual behavior is used (it searches sys.argv for -v).
|
|
"""
|
|
|
|
import doctest
|
|
|
|
if verbosity is None:
|
|
verbosity = verbose
|
|
else:
|
|
verbosity = None
|
|
|
|
# Direct doctest output (normally just errors) to real stdout; doctest
|
|
# output shouldn't be compared by regrtest.
|
|
save_stdout = sys.stdout
|
|
sys.stdout = get_original_stdout()
|
|
try:
|
|
f, t = doctest.testmod(module, verbose=verbosity)
|
|
if f:
|
|
raise TestFailed("%d of %d doctests failed" % (f, t))
|
|
finally:
|
|
sys.stdout = save_stdout
|
|
if verbose:
|
|
print('doctest (%s) ... %d tests with zero failures' %
|
|
(module.__name__, t))
|
|
return f, t
|
|
|
|
#=======================================================================
|
|
# Threading support to prevent reporting refleaks when running regrtest.py -R
|
|
|
|
def threading_setup():
|
|
import threading
|
|
return len(threading._active), len(threading._limbo)
|
|
|
|
def threading_cleanup(num_active, num_limbo):
|
|
import threading
|
|
import time
|
|
|
|
_MAX_COUNT = 10
|
|
count = 0
|
|
while len(threading._active) != num_active and count < _MAX_COUNT:
|
|
count += 1
|
|
time.sleep(0.1)
|
|
|
|
count = 0
|
|
while len(threading._limbo) != num_limbo and count < _MAX_COUNT:
|
|
count += 1
|
|
time.sleep(0.1)
|
|
|
|
def reap_children():
|
|
"""Use this function at the end of test_main() whenever sub-processes
|
|
are started. This will help ensure that no extra children (zombies)
|
|
stick around to hog resources and create problems when looking
|
|
for refleaks.
|
|
"""
|
|
|
|
# Reap all our dead child processes so we don't leave zombies around.
|
|
# These hog resources and might be causing some of the buildbots to die.
|
|
if hasattr(os, 'waitpid'):
|
|
any_process = -1
|
|
while True:
|
|
try:
|
|
# This will raise an exception on Windows. That's ok.
|
|
pid, status = os.waitpid(any_process, os.WNOHANG)
|
|
if pid == 0:
|
|
break
|
|
except:
|
|
break
|