Mac Easy 2010 May/Mac Life Ubuntu.iso/casper/filesystem.squashfs/usr/lib/python2.6/test/test_support.pyc

Python Compiled Bytecode | 2009-04-20 | 29.6 KB | 874 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.6)

'''Supporting definitions for the Python regression tests.'''
if __name__ != 'test.test_support':
    raise ImportError('test_support must be imported from the test package')
__name__ != 'test.test_support'
import contextlib
import errno
import socket
import sys
import os
import shutil
import warnings
import unittest
__all__ = [
    'Error',
    'TestFailed',
    'TestSkipped',
    'ResourceDenied',
    'import_module',
    'verbose',
    'use_resources',
    'max_memuse',
    'record_original_stdout',
    'get_original_stdout',
    'unload',
    'unlink',
    'rmtree',
    'forget',
    'is_resource_enabled',
    'requires',
    'find_unused_port',
    'bind_port',
    'fcmp',
    'have_unicode',
    'is_jython',
    'TESTFN',
    'HOST',
    'FUZZ',
    'findfile',
    'verify',
    'vereq',
    'sortdict',
    'check_syntax_error',
    'open_urlresource',
    'check_warnings',
    'CleanImport',
    'EnvironmentVarGuard',
    'captured_output',
    'captured_stdout',
    'TransientResource',
    'transient_internet',
    'run_with_locale',
    'set_memlimit',
    'bigmemtest',
    'bigaddrspacetest',
    'BasicTestRunner',
    'run_unittest',
    'run_doctest',
    'threading_setup',
    'threading_cleanup',
    'reap_children']

class Error(Exception):
    '''Base class for regression test exceptions.'''
    pass


class TestFailed(Error):
    '''Test failed.'''
    pass


class TestSkipped(Error):
    """Test skipped.

    This can be raised to indicate that a test was deliberatly
    skipped, but not because a feature wasn't available.  For
    example, if some resource can't be used, such as the network
    appears to be unavailable, this should be raised instead of
    TestFailed.
    """
    pass


class ResourceDenied(TestSkipped):
    '''Test skipped because it requested a disallowed resource.

    This is raised when a test calls requires() for a resource that
    has not be enabled.  It is used to distinguish between expected
    and unexpected skips.
    '''
    pass


def import_module(name, deprecated = False):
    '''Import the module to be tested, raising TestSkipped if it is not
    available.'''
    warnings.catch_warnings().__enter__()

    try:

        try:
            module = __import__(name, level = 0)
        except ImportError:
            None if deprecated else warnings.catch_warnings()
            None if deprecated else warnings.catch_warnings()
            raise TestSkipped('No module named ' + name)
        except:
            None if deprecated else warnings.catch_warnings()

        return module
    finally:
        pass


verbose = 1
use_resources = None
max_memuse = 0
real_max_memuse = 0
_original_stdout = None

def record_original_stdout(stdout):
    global _original_stdout
    _original_stdout = stdout


def get_original_stdout():
    if not _original_stdout:
        pass
    return sys.stdout


def unload(name):

    try:
        del sys.modules[name]
    except KeyError:
        pass



def unlink(filename):

    try:
        os.unlink(filename)
    except OSError:
        pass



def rmtree(path):

    try:
        shutil.rmtree(path)
    except OSError:
        e = None
        if e.errno not in (errno.ENOENT, errno.ESRCH):
            raise
        e.errno not in (errno.ENOENT, errno.ESRCH)



def forget(modname):
    '''"Forget" a module was ever imported by removing it from sys.modules and
    deleting any .pyc and .pyo files.'''
    unload(modname)
    for dirname in sys.path:
        unlink(os.path.join(dirname, modname + os.extsep + 'pyc'))
        unlink(os.path.join(dirname, modname + os.extsep + 'pyo'))



def is_resource_enabled(resource):
    '''Test whether a resource is enabled.  Known resources are set by
    regrtest.py.'''
    if use_resources is not None:
        pass
    return resource in use_resources


def requires(resource, msg = None):
    """Raise ResourceDenied if the specified resource is not available.

    If the caller's module is __main__ then automatically return True.  The
    possibility of False being returned occurs when regrtest.py is executing."""
    if sys._getframe().f_back.f_globals.get('__name__') == '__main__':
        return None
    if not is_resource_enabled(resource):
        if msg is None:
            msg = "Use of the `%s' resource not enabled" % resource

        raise ResourceDenied(msg)
    is_resource_enabled(resource)

HOST = 'localhost'

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
    socket.error 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!')
            sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1

        if hasattr(socket, 'SO_REUSEPORT'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                raise TestFailed('tests should never set the SO_REUSEPORT socket option on TCP/IP sockets!')
            sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1

        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)


    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port

FUZZ = 1e-06

def fcmp(x, y):
    if isinstance(x, float) or isinstance(y, float):

        try:
            fuzz = (abs(x) + abs(y)) * FUZZ
            if abs(x - y) <= fuzz:
                return 0

    elif type(x) == type(y) and isinstance(x, (tuple, list)):
        for i in range(min(len(x), len(y))):
            outcome = fcmp(x[i], y[i])
            if outcome != 0:
                return outcome

        return (len(x) > len(y)) - (len(x) < len(y))
    outcome != 0
    return (x > y) - (x < y)


try:
    unicode
    have_unicode = True
except NameError:
    have_unicode = False

is_jython = sys.platform.startswith('java')
if os.name == 'java':
    TESTFN = '$test'
elif os.name == 'riscos':
    TESTFN = 'testfile'
else:
    TESTFN = '@test'
    if have_unicode:
        if isinstance('', unicode):
            TESTFN_UNICODE = '@test-\xe0\xf2'
        else:
            TESTFN_UNICODE = unicode('@test-\xe0\xf2', 'latin-1')
        TESTFN_ENCODING = sys.getfilesystemencoding()
        if not hasattr(sys, 'getwindowsversion') or sys.getwindowsversion()[3] < 2:
            TESTFN_UNICODE_UNENCODEABLE = None
        else:
            TESTFN_UNICODE_UNENCODEABLE = eval('u"@test-\\u5171\\u6709\\u3055\\u308c\\u308b"')

            try:
                TESTFN_UNICODE_UNENCODEABLE.encode('Latin1')
            except UnicodeEncodeError:
                pass

            print 'WARNING: The filename %r CAN be encoded by the filesystem.  Unicode filename tests may not be effective' % TESTFN_UNICODE_UNENCODEABLE

fp = None

try:
    fp = open(TESTFN, 'w+')
except IOError:
    TMP_TESTFN = os.path.join('/tmp', TESTFN)

    try:
        fp = open(TMP_TESTFN, 'w+')
        TESTFN = TMP_TESTFN
        del TMP_TESTFN
    except IOError:
        print 'WARNING: tests will fail, unable to write to: %s or %s' % (TESTFN, TMP_TESTFN)
    except:
        None<EXCEPTION MATCH>IOError


    None<EXCEPTION MATCH>IOError

if fp is not None:
    fp.close()
    unlink(TESTFN)

del fp

def findfile(file, here = __file__):
    '''Try to find a file on sys.path and the working directory.  If it is not
    found the argument passed to the function is returned (this does not
    necessarily signal failure; could still be the legitimate path).'''
    if os.path.isabs(file):
        return file
    path = sys.path
    path = [
        os.path.dirname(here)] + path
    for dn in path:
        fn = os.path.join(dn, file)
        if os.path.exists(fn):
            return fn

    return file


def verify(condition, reason = 'test failed'):
    '''Verify that condition is true. If not, raise TestFailed.

       The optional argument reason can be given to provide
       a better error text.
    '''
    if not condition:
        raise TestFailed(reason)
    condition


def vereq(a, b):
    '''Raise TestFailed if a == b is false.

    This is better than verify(a == b) because, in case of failure, the
    error message incorporates repr(a) and repr(b) so you can see the
    inputs.

    Note that "not (a == b)" isn\'t necessarily the same as "a != b"; the
    former is tested.
    '''
    if not a == b:
        raise TestFailed('%r == %r' % (a, b))
    a == b


def sortdict(dict):
    '''Like repr(dict), but in sorted order.'''
    items = dict.items()
    items.sort()
    reprpairs = [ '%r: %r' % pair for pair in items ]
    withcommas = ', '.join(reprpairs)
    return '{%s}' % withcommas


def make_bad_fd():
    '''
    Create an invalid file descriptor by opening and closing a file and return
    its fd.
    '''
    file = open(TESTFN, 'wb')

    try:
        return file.fileno()
    finally:
        file.close()
        unlink(TESTFN)



def check_syntax_error(testcase, statement):

    try:
        compile(statement, '<test string>', 'exec')
    except SyntaxError:
        pass

    testcase.fail('Missing SyntaxError: "%s"' % statement)


def open_urlresource(url):
    import urllib
    import urlparse
    requires('urlfetch')
    filename = urlparse.urlparse(url)[2].split('/')[-1]
    for path in [
        os.path.curdir,
        os.path.pardir]:
        fn = os.path.join(path, filename)
        if os.path.exists(fn):
            return open(fn)

    print >>get_original_stdout(), '\tfetching %s ...' % url
    (fn, _) = urllib.urlretrieve(url, filename)
    return open(fn)


class WarningsRecorder(object):
    '''Convenience wrapper for the warnings list returned on
       entry to the warnings.catch_warnings() context manager.
    '''

    def __init__(self, warnings_list):
        self.warnings = warnings_list


    def __getattr__(self, attr):
        if self.warnings:
            return getattr(self.warnings[-1], attr)
        if attr in warnings.WarningMessage._WARNING_DETAILS:
            return None
        raise AttributeError('%r has no attribute %r' % (self, attr))


    def reset(self):
        del self.warnings[:]



def check_warnings():

    try:
        w = _[1]
        yield WarningsRecorder(w)
        warnings.catch_warnings(record = True).__exit__
    finally:
        pass


check_warnings = contextlib.contextmanager(check_warnings)

class CleanImport(object):
    '''Context manager to force import to return a new module reference.

    This is useful for testing module-level behaviours, such as
    the emission of a DeprecationWarning on import.

    Use like this:

        with CleanImport("foo"):
            __import__("foo") # new reference
    '''

    def __init__(self, *module_names):
        self.original_modules = sys.modules.copy()
        for module_name in module_names:
            if module_name in sys.modules:
                module = sys.modules[module_name]
                if module.__name__ != module_name:
                    del sys.modules[module.__name__]

                del sys.modules[module_name]
                continue



    def __enter__(self):
        return self


    def __exit__(self, *ignore_exc):
        sys.modules.update(self.original_modules)



class EnvironmentVarGuard(object):
    '''Class to help protect the environment variable properly.  Can be used as
    a context manager.'''

    def __init__(self):
        self._environ = os.environ
        self._unset = set()
        self._reset = dict()


    def set(self, envvar, value):
        if envvar not in self._environ:
            self._unset.add(envvar)
        else:
            self._reset[envvar] = self._environ[envvar]
        self._environ[envvar] = value


    def unset(self, envvar):
        if envvar in self._environ:
            self._reset[envvar] = self._environ[envvar]
            del self._environ[envvar]



    def __enter__(self):
        return self


    def __exit__(self, *ignore_exc):
        for envvar, value in self._reset.iteritems():
            self._environ[envvar] = value

        for unset in self._unset:
            del self._environ[unset]




class TransientResource(object):
    '''Raise ResourceDenied if an exception is raised while the context manager
    is in effect that matches the specified exception and attributes.'''

    def __init__(self, exc, **kwargs):
        self.exc = exc
        self.attrs = kwargs


    def __enter__(self):
        return self


    def __exit__(self, type_ = None, value = None, traceback = None):
        '''If type_ is a subclass of self.exc and value has attributes matching
        self.attrs, raise ResourceDenied.  Otherwise let the exception
        propagate (if any).'''
        if type_ is not None and issubclass(self.exc, type_):
            for attr, attr_value in self.attrs.iteritems():
                if not hasattr(value, attr):
                    break

                if getattr(value, attr) != attr_value:
                    break
                    continue
            else:
                raise ResourceDenied('an optional resource is not available')



def transient_internet():
    '''Return a context manager that raises ResourceDenied when various issues
    with the Internet connection manifest themselves as exceptions.'''
    time_out = TransientResource(IOError, errno = errno.ETIMEDOUT)
    socket_peer_reset = TransientResource(socket.error, errno = errno.ECONNRESET)
    ioerror_peer_reset = TransientResource(IOError, errno = errno.ECONNRESET)
    return contextlib.nested(time_out, socket_peer_reset, ioerror_peer_reset)


def captured_output(stream_name):
    '''Run the \'with\' statement body using a StringIO object in place of a
    specific attribute on the sys module.
    Example use (with \'stream_name=stdout\')::

       with captured_stdout() as s:
           print "hello"
       assert s.getvalue() == "hello"
    '''
    import StringIO
    orig_stdout = getattr(sys, stream_name)
    setattr(sys, stream_name, StringIO.StringIO())

    try:
        yield getattr(sys, stream_name)
    finally:
        setattr(sys, stream_name, orig_stdout)


captured_output = contextlib.contextmanager(captured_output)

def captured_stdout():
    return captured_output('stdout')


def run_with_locale(catstr, *locales):

    def decorator(func):

        def inner(*args, **kwds):

            try:
                import locale
                category = getattr(locale, catstr)
                orig_locale = locale.setlocale(category)
            except AttributeError:
                raise
            except:
                locale = None
                orig_locale = None

            for loc in locales:

                try:
                    locale.setlocale(category, loc)
                continue
                continue



            try:
                return func(*args, **kwds)
            finally:
                if locale and orig_locale:
                    locale.setlocale(category, orig_locale)



        inner.func_name = func.func_name
        inner.__doc__ = func.__doc__
        return inner

    return decorator

_1M = 1048576
_1G = 1024 * _1M
_2G = 2 * _1G
_4G = 4 * _1G
MAX_Py_ssize_t = sys.maxsize

def set_memlimit(limit):
    global real_max_memuse, max_memuse
    import re
    sizes = {
        'k': 1024,
        'm': _1M,
        'g': _1G,
        't': 1024 * _1G }
    m = re.match('(\\d+(\\.\\d+)?) (K|M|G|T)b?$', limit, re.IGNORECASE | re.VERBOSE)
    if m is None:
        raise ValueError('Invalid memory limit %r' % (limit,))
    m is None
    memlimit = int(float(m.group(1)) * sizes[m.group(3).lower()])
    real_max_memuse = memlimit
    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,))
    memlimit < _2G - 1
    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):
            return f(self, maxsize)

        wrapper.minsize = minsize
        wrapper.memuse = memuse
        wrapper.overhead = overhead
        return wrapper

    return decorator


def precisionbigmemtest(size, memuse, overhead = 5 * _1M):

    def decorator(f):

        def wrapper(self):
            return f(self, maxsize)

        wrapper.size = size
        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 max_memuse < MAX_Py_ssize_t

    return wrapper


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)
    result.wasSuccessful()


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')
        cls in sys.modules
        if isinstance(cls, valid_types):
            suite.addTest(cls)
            continue
        suite.addTest(unittest.makeSuite(cls))

    _run_suite(suite)


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
    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))
        f
    finally:
        sys.stdout = save_stdout

    if verbose:
        print 'doctest (%s) ... %d tests with zero failures' % (module.__name__, t)

    return (f, t)


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.
    '''
    if hasattr(os, 'waitpid'):
        any_process = -1
        while True:

            try:
                (pid, status) = os.waitpid(any_process, os.WNOHANG)
                if pid == 0:
                    break
            continue
            break
            continue