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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.
( u socketu bind_portu close( u familyu socktypeu tempsocku port( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu find_unused_port� s
8
c
C s | j t j k r� | j t j k r� t t d � rc | j t j t j � d k rc t d � � qc n t t d � r� y1 | j t j t j
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r� Yq� Xn t t d � r� | j t j t j
d � q� n | j | d f � | j � d } | S( u% 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.
u SO_REUSEADDRi uH tests should never set the SO_REUSEADDR socket option on TCP/IP sockets!u SO_REUSEPORTuH tests should never set the SO_REUSEPORT socket option on TCP/IP sockets!u SO_EXCLUSIVEADDRUSEi ( u familyu socketu AF_INETu typeu SOCK_STREAMu hasattru
getsockoptu
SOL_SOCKETu SO_REUSEADDRu
TestFailedu SO_REUSEPORTu OSErroru
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c C s t j r{ d } zR y- t j t j t j � } | j d � d SWn t j t j f k
r_ Yn XWd | rw | j � n Xn d S( u+ Check whether IPv6 is enabled on this host.u ::1i N( u ::1i TF( u socketu has_ipv6u Noneu AF_INET6u SOCK_STREAMu bindu Trueu erroru gaierroru closeu False( u sock( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu _is_ipv6_enabledL s
u _is_ipv6_enabledi i i u doubleu IEEEu test requires IEEE 754 doublesu
requires zlibu
requires gzipu requires bz2u
requires lzmau javau $testu @testu {}_{}_tmpu æu İu Łu φu Кu אu ،u تu กu u €u -àòɘŁğu darwinu NFDu ntu cei u -共Ł♡ͣ�ut WARNING: The filename %r CAN be encoded by the filesystem encoding (%s). Unicode filename tests may not be effectives �s -�u surrogateescapes �w�s ���s �s ��u -c c s� d } | d k r9 t j � } d } t j j | � } nR y t j | � d } Wn8 t k
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j | � n Xd S( u� Return a context manager that creates a temporary directory.
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path: the directory to create temporarily. If omitted or None,
defaults to creating a temporary directory using tempfile.mkdtemp.
quiet: if False (the default), the context manager raises an exception
on error. Otherwise, if the path is specified and cannot be
created, only a warning is issued.
u+ tests may fail, unable to create temp dir: u
stackleveli NFT( u Falseu Noneu tempfileu mkdtempu Trueu osu pathu realpathu mkdiru OSErroru warningsu warnu RuntimeWarningu shutilu rmtree( u pathu quietu dir_created( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu temp_dir s"
u temp_dirc c s| t j � } y t j | � Wn8 t k
rW | s9 � n t j d | t d d �Yn Xz t j � VWd t j | � Xd S( ug Return a context manager that changes the current working directory.
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path: the directory to use as the temporary current working directory.
quiet: if False (the default), the context manager raises an exception
on error. Otherwise, it issues only a warning and keeps the current
working directory the same.
u) tests may fail, unable to change CWD to: u
stackleveli N( u osu getcwdu chdiru OSErroru warningsu warnu RuntimeWarning( u pathu quietu saved_dir( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
change_cwd% s
u
change_cwdu tempcwdc c sB t d | d | � �' } t | d | �� } | VWd QXWd QXd S( u�
Context manager that temporarily creates and changes the CWD.
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after creating a temporary directory in the current directory with
name *name*. If *name* is None, the temporary directory is
created using tempfile.mkdtemp.
If *quiet* is False (default) and it is not possible to
create or change the CWD, an error is raised. If *quiet* is True,
only a warning is raised and the original CWD is used.
u pathu quietN( u temp_diru
change_cwd( u nameu quietu temp_pathu cwd_dir( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu temp_cwd@ s u umaskc c s- t j | � } z d VWd t j | � Xd S( u8 Context manager that temporarily sets the process umask.N( u osu umask( u umasku oldmask( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
temp_umaskT s u datac C s� t j j | � r | S| d k r: t j j | | � } n t g t j } x9 | D]1 } t j j | | � } t j j | � rQ | SqQ W| S( u[ Try to find a file on sys.path or in the test 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).
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rather than looking directly in the path directories.
N( u osu pathu isabsu Noneu joinu
TEST_HOME_DIRu sysu exists( u filenameu subdiru pathu dnu fn( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu findfilee s
c C s4 t j | t j t j Bt j B� } t j | � d S( u> Create an empty file. If the file already exists, truncate it.N( u osu openu O_WRONLYu O_CREATu O_TRUNCu close( u filenameu fd( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu create_empty_filew s #c C s< t | j � � } d d � | D� } d j | � } d | S( u% Like repr(dict), but in sorted order.c S s g | ] } d | � q S( u %r: %r( ( u .0u pair( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
<listcomp> s u sortdict.<locals>.<listcomp>u , u {%s}( u sortedu itemsu join( u dictu itemsu reprpairsu
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Create an invalid file descriptor by opening and closing a file and return
its fd.
u wbN( u openu TESTFNu filenou closeu unlink( u file( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu make_bad_fd� s
u make_bad_fdc C s | j t t | d d � d S( Nu
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sz d d l } d d l } � j d d � � | j j | � d j d � d } t j j t
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u* open_urlresource.<locals>.check_valid_fileu urlfetchu fetching %s ...u fileu timeouti u wbu invalid resource %ri����( u urllib.requestu urllib.parseu popu Noneu parseu urlparseu splitu osu pathu joinu
TEST_DATA_DIRu existsu unlinku requiresu printu get_original_stdoutu requestu urlopenu openu readu writeu closeu
TestFailed(
u urlu argsu kwu urllibu filenameu fnu check_valid_fileu fu outu s( ( u argsu checku kwu: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu open_urlresource� s0 #
c B sP | Ee Z d Z d Z d d � Z d d � Z e d d � � Z d d � Z d
S( u WarningsRecorderuy Convenience wrapper for the warnings list returned on
entry to the warnings.catch_warnings() context manager.
c C s | | _ d | _ d S( Ni ( u _warningsu _last( u selfu
warnings_list( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __init__� s u WarningsRecorder.__init__c C s\ t | j � | j k r, t | j d | � S| t j j k rB d St d | | f � � d S( Ni u %r has no attribute %ri����( u lenu _warningsu _lastu getattru warningsu WarningMessageu _WARNING_DETAILSu Noneu AttributeError( u selfu attr( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __getattr__� s
u WarningsRecorder.__getattr__c C s | j | j d � S( N( u _warningsu _last( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu warnings� s u WarningsRecorder.warningsc C s t | j � | _ d S( N( u lenu _warningsu _last( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu reset� s u WarningsRecorder.resetN( u __name__u
__module__u __qualname__u __doc__u __init__u __getattr__u propertyu warningsu reset( u
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� �& } t j d j d � t
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} | j | � q� q� W| r� | r� | j | | j f � q� q� W| rKt d | d � � n | rht d | d � � n d S( u� Catch the warnings, then check if all the expected
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i u __warningregistry__u recordu warningsu alwaysNu unhandled warning %si u) filter (%r, %s) did not catch any warningTF( u sysu _getframeu f_globalsu getu clearu warningsu catch_warningsu Trueu modulesu simplefilteru WarningsRecorderu listu Falseu messageu reu matchu stru Iu
issubclassu __class__u removeu appendu __name__u AssertionError( u filtersu quietu frameu registryu wu reraiseu missingu msgu catu seenu warning( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu _filterwarnings� s0
u _filterwarningsc O sI | j d � } | s< d t f f } | d k r< d } q< n t | | � S( u� Context manager to silence warnings.
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("message regexp", WarningCategory)
Optional argument:
- if 'quiet' is True, it does not fail if a filter catches nothing
(default True without argument,
default False if some filters are defined)
Without argument, it defaults to:
check_warnings(("", Warning), quiet=True)
u quietu NT( u getu Warningu Noneu Trueu _filterwarnings( u filtersu kwargsu quiet( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu check_warnings� s c B s> | Ee Z d Z d Z d d � Z d d � Z d d � Z d S( u CleanImportu, 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"):
importlib.import_module("foo") # new reference
c G so t j j � | _ xV | D]N } | t j k r t j | } | j | k rZ t j | j =n t j | =q q Wd S( N( u sysu modulesu copyu original_modulesu __name__( u selfu module_namesu module_nameu module( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __init__! s
u CleanImport.__init__c C s | S( N( ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __enter__. s u CleanImport.__enter__c G s t j j | j � d S( N( u sysu modulesu updateu original_modules( u selfu
ignore_exc( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __exit__1 s u CleanImport.__exit__N( u __name__u
__module__u __qualname__u __doc__u __init__u __enter__u __exit__( u
__locals__( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu CleanImport s
c B s� | Ee Z d Z d Z d d � Z d d � Z d d � Z d d � Z d
d � Z d d
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d d � Z d d � Z d d � Z
d d � Z d S( u EnvironmentVarGuardu_ Class to help protect the environment variable properly. Can be used as
a context manager.c C s t j | _ i | _ d S( N( u osu environu _environu _changed( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __init__: s u EnvironmentVarGuard.__init__c C s | j | S( N( u _environ( u selfu envvar( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __getitem__> s u EnvironmentVarGuard.__getitem__c C s< | | j k r+ | j j | � | j | <n | | j | <d S( N( u _changedu _environu get( u selfu envvaru value( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __setitem__A s u EnvironmentVarGuard.__setitem__c C sK | | j k r+ | j j | � | j | <n | | j k rG | j | =n d S( N( u _changedu _environu get( u selfu envvar( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __delitem__G s u EnvironmentVarGuard.__delitem__c C s
| j j � S( N( u _environu keys( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu keysN s u EnvironmentVarGuard.keysc C s
t | j � S( N( u iteru _environ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __iter__Q s u EnvironmentVarGuard.__iter__c C s
t | j � S( N( u lenu _environ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __len__T s u EnvironmentVarGuard.__len__c C s | | | <d S( N( ( u selfu envvaru value( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu setW s u EnvironmentVarGuard.setc C s | | =d S( N( ( u selfu envvar( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu unsetZ s u EnvironmentVarGuard.unsetc C s | S( N( ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __enter__] s u EnvironmentVarGuard.__enter__c G sh xU | j j � D]D \ } } | d k rG | | j k rT | j | =qT q | | j | <q W| j t _ d S( N( u _changedu itemsu Noneu _environu osu environ( u selfu
ignore_excu ku v( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __exit__` s u EnvironmentVarGuard.__exit__N( u __name__u
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__locals__( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu EnvironmentVarGuard5 s c B s> | Ee Z d Z d Z d d � Z d d � Z d d � Z d S( u
DirsOnSysPathu� Context manager to temporarily add directories to sys.path.
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as positional arguments, then reverts sys.path to the copied
settings when the context ends.
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context manager, including replacement of the object,
will be reverted at the end of the block.
c G s6 t j d d � | _ t j | _ t j j | � d S( N( u sysu pathu original_valueu original_objectu extend( u selfu paths( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __init__v s u DirsOnSysPath.__init__c C s | S( N( ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __enter__{ s u DirsOnSysPath.__enter__c G s& | j t _ | j t j d d � <d S( N( u original_objectu sysu pathu original_value( u selfu
ignore_exc( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __exit__~ s u DirsOnSysPath.__exit__N( u __name__u
__module__u __qualname__u __doc__u __init__u __enter__u __exit__( u
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DirsOnSysPathj s
u
DirsOnSysPathc B sG | Ee Z d Z d Z d d � Z d d � Z d d d d d � Z d S( u TransientResourceu� Raise ResourceDenied if an exception is raised while the context manager
is in effect that matches the specified exception and attributes.c K s | | _ | | _ d S( N( u excu attrs( u selfu excu kwargs( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __init__� s u TransientResource.__init__c C s | S( N( ( u self( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu __enter__� s u TransientResource.__enter__c C s} | d k ry t | j | � ry xX | j j � D]8 \ } } t | | � sM Pn t | | � | k r. Pq. q. Wt d � � n d S( u� If type_ is a subclass of self.exc and value has attributes matching
self.attrs, raise ResourceDenied. Otherwise let the exception
propagate (if any).u% an optional resource is not availableN( u Noneu
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ri} z� xq | j } t | � d k rt | d t � r| d } q� t | � d k rFt | d t � rF| d } q� Pq� | | � � WYd d } ~ Xn XWd t j | � Xd S(, u� Return a context manager that raises ResourceDenied when various issues
with the Internet connection manifest themselves as exceptions.u ECONNREFUSEDio u
ECONNRESETih u EHOSTUNREACHiq u ENETUNREACHie u ETIMEDOUTin u EAI_AGAINi u EAI_FAILi u
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<listcomp>� s u& transient_internet.<locals>.<listcomp>c S s( g | ] \ } } t t | | � � q S( ( u getattru socket( u .0u nameu num( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
<listcomp>� s c s� t | d d � } t | t j � sN t | t j � rB | � k sN | � k r~ t sr t j j � j
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( u getattru Noneu
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isinstance( u
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gai_errnosu: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu transient_internet� sF
%
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c
c s[ d d l } t t | � } t t | | j � � z t t | � VWd t t | | � Xd S( u� Return a context manager used by captured_stdout/stdin/stderr
that temporarily replaces the sys stream *stream_name* with a StringIO.i N( u iou getattru sysu setattru StringIO( u stream_nameu iou orig_stdout( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu captured_output� s u captured_outputc C s
t d � S( u� Capture the output of sys.stdout:
with captured_stdout() as stdout:
print("hello")
self.assertEqual(stdout.getvalue(), "hello
")
u stdout( u captured_output( ( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu captured_stdout� s c C s
t d � S( u� Capture the output of sys.stderr:
with captured_stderr() as stderr:
print("hello", file=sys.stderr)
self.assertEqual(stderr.getvalue(), "hello
")
u stderr( u captured_output( ( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu captured_stderr� s c C s
t d � S( u Capture the input to sys.stdin:
with captured_stdin() as stdin:
stdin.write('hello
')
stdin.seek(0)
# call test code that consumes from sys.stdin
captured = input()
self.assertEqual(captured, "hello")
u stdin( u captured_output( ( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu captured_stdin s
c C s8 t j � t r t j d � n t j � t j � d S( u� 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.
g�������?N( u gcu collectu is_jythonu timeu sleep( ( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
gc_collect s
u
gc_collectc
c s: t j � } t j � z d VWd | r5 t j � n Xd S( N( u gcu isenabledu disableu enable( u have_gc( ( u: /opt/alt/python33/lib64/python3.3/test/support/__init__.pyu
disable_gc s
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if 'dry_run' is False, it means the test doesn't support dummy runs
when -M is not specified.
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