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eliciting an unused ephemeral port from the OS. The temporary socket is
then closed and deleted, and the ephemeral port is returned.
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server socket needs to be bound to a particular port for the duration of
the test. Which one to use depends on whether the calling code is creating
a python socket, or if an unused port needs to be provided in a constructor
or passed to an external program (i.e. the -accept argument to openssl's
s_server mode). Always prefer bind_port() over find_unused_port() where
possible. Hard coded ports should *NEVER* be used. As soon as a server
socket is bound to a hard coded port, the ability to run multiple instances
of the test simultaneously on the same host is compromised, which makes the
test a ticking time bomb in a buildbot environment. On Unix buildbots, this
may simply manifest as a failed test, which can be recovered from without
intervention in most cases, but on Windows, the entire python process can
completely and utterly wedge, requiring someone to log in to the buildbot
and manually kill the affected process.
(This is easy to reproduce on Windows, unfortunately, and can be traced to
the SO_REUSEADDR socket option having different semantics on Windows versus
Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind,
listen and then accept connections on identical host/ports. An EADDRINUSE
OSError will be raised at some point (depending on the platform and
the order bind and listen were called on each socket).
However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE
will ever be raised when attempting to bind two identical host/ports. When
accept() is called on each socket, the second caller's process will steal
the port from the first caller, leaving them both in an awkwardly wedged
state where they'll no longer respond to any signals or graceful kills, and
must be forcibly killed via OpenProcess()/TerminateProcess().
The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option
instead of SO_REUSEADDR, which effectively affords the same semantics as
SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open
Source world compared to Windows ones, this is a common mistake. A quick
look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when
openssl.exe is called with the 's_server' option, for example. See
http://bugs.python.org/issue2550 for more info. The following site also
has a very thorough description about the implications of both REUSEADDR
and EXCLUSIVEADDRUSE on Windows:
http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
XXX: although this approach is a vast improvement on previous attempts to
elicit unused ports, it rests heavily on the assumption that the ephemeral
port returned to us by the OS won't immediately be dished back out to some
other process when we close and delete our temporary socket but before our
calling code has a chance to bind the returned port. We can deal with this
issue if/when we come across it.
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rD |s, tjd| tdd Y nX zt j V W dt j| X dS )ag Return a context manager that changes the current working directory.
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statement exit.
Use _thread.count() to check if threads exited. Indirectly, wait until
threads exit the internal t_bootstrap() C function of the _thread module.
threading_setup() and threading_cleanup() are designed to emit a warning
if a test leaves running threads in the background. This context manager
is designed to cleanup threads started by the _thread.start_new_thread()
which doesn't allow to wait for thread exit, whereas thread.Thread has a
join() method.
Nz!wait_threads() failed to cleanup z threads after z.1fz seconds (count: z
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start_timeZdeadlinerP Zdtrx rd rd re wait_threads_exit s
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rT c
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are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
waitpidr r z2Warning -- reap_children() reaped child process %s)r NrY )r r rU WNOHANGr ro r )Z any_processr1 Zstatusrd rd re rL s
c c s* t | } g }zZy$x | D ]}|j |j| qW W n* trVtdt| t|f Y nX d V W d z|rt| tj }}xltddD ]^}|d7 }x$|D ] }|jt |tj d qW dd |D }|sP trtdt||f qW W d d d |D }|r"t
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t| X X d S ) Nz/Can't start %d threads, only %d threads startedr r < g{Gz?c S s g | ]}|j r|qS rd )isAlive)rB r rd rd re rC s z!start_threads.<locals>.<listcomp>z7Unable to join %d threads during a period of %d minutesc S s g | ]}|j r|qS rd )rX )rB r rd rd re rC s zUnable to join %d threads)r| r r r r r r rO r max faulthandlerZdump_tracebackro r r{ )ZthreadsZunlockr r ZendtimeZ starttimer rd rd re rQ s>
c
c sn t | |r<t| |}t| || z
|V W dt| || X n.t| || z
dV W dt | |rht| | X dS )a Temporary swap out an attribute with a new object.
Usage:
with swap_attr(obj, "attr", 5):
...
This will set obj.attr to 5 for the duration of the with: block,
restoring the old value at the end of the block. If `attr` doesn't
exist on `obj`, it will be created and then deleted at the end of the
block.
The old value (or None if it doesn't exist) will be assigned to the
target of the "as" clause, if there is one.
N)r r r delattr)r rk new_valreal_valrd rd re rW s
c c sX || kr0| | }|| |< z
|V W d|| |< X n$|| |< z
dV W d|| krR| |= X dS )a Temporary swap out an item with a new object.
Usage:
with swap_item(obj, "item", 5):
...
This will set obj["item"] to 5 for the duration of the with: block,
restoring the old value at the end of the block. If `item` doesn't
exist on `obj`, it will be created and then deleted at the end of the
block.
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target of the "as" clause, if there is one.
Nrd )r itemr\ r] rd rd re rV s
c C s t jdd| j } | S )zStrip the stderr of a Python process from potential debug output
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This will typically be run on the result of the communicate() method
of a subprocess.Popen object.
s \[\d+ refs, \d+ blocks\]\r?\n? )rv substrip)r rd rd re strip_python_stderr8 s rb Z getcountsz-types are immortal if COUNT_ALLOCS is definedc C s t j S )znReturn a list of command-line arguments reproducing the current
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zTestHandler.emitc K s. d}x$| j D ]}| jj|f|r d}P q W |S )zW
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FT)r rh matches)rg r r drd rd re rl d s zTestHandler.matchesN)r` ra rb rh ri rk rl rd rd rd re rM S s c @ s e Zd ZdZdd Zdd ZdS ) rX rx ru c K s< d}x2|D ]*}|| }|j |}| j|||s
d}P q
W |S )a.
Try to match a single dict with the supplied arguments.
Keys whose values are strings and which are in self._partial_matches
will be checked for partial (i.e. substring) matches. You can extend
this scheme to (for example) do regular expression matching, etc.
TF)r] match_value)rg rm r r r r dvrd rd re rl s s
zMatcher.matchesc C sH t |t |krd}n.t |tk s,|| jkr6||k}n|j|dk}|S )zT
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Fr )r ru _partial_matchesfind)rg r ro r r rd rd re rn s
zMatcher.match_valueN)rx ru )r` ra rb rp rl rn rd rd rd re rX o s c
C sZ t d k r t S td } ytjt| d}W n tttfk
rF d}Y n X tj| |a |S )Nr TF) _can_symlinkr r symlinkr NotImplementedErrorr rz )Z symlink_pathcanrd rd re r s
c C s t }d}|r| S tj|| S )z8Skip decorator for tests that require functional symlinkz*Requires functional symlink implementation)r rs r )r okrx rd rd re r/ s c C s t d k r t S ttds d} ntj }tj|d\}}zttd}y`tj|dd tj|dd tj|j dd t
j }t j
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r d} Y nX W d Q R X W d tt t| t| X | a | S ) NsetxattrF)dirrF s user.testr_ s trusted.foos 42z
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r| c C s t }d}|r| S tj|| S )zDSkip decorator for tests that require functional extended attributesz(no non-broken extended attribute support)r| rs r )r rv rx rd rd re r8 s c C s$ t pt}d}|r| S tj|| S )z;Skip decorator for tests not run in (non-extended) PGO taskz#Not run for (non-extended) PGO task)r] PGO_EXTENDEDrs r )r rv rx rd rd re skip_if_pgo_task s
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rN dS X W dQ R X dS )zKDetects if the file system for the specified directory is case-insensitive.)rx FN) r+ ZNamedTemporaryFilerv upperr r r samefiler )Z directorybase base_pathZ case_pathrd rd re r s )rf c C s> t t| t t| }|r(|t |8 }t dd |D }|S )a Returns the set of items in ref_api not in other_api, except for a
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c s s( | ] }|j d s |jdr|V qdS )___N)rq endswith)rB r rd rd re <genexpr> s z&detect_api_mismatch.<locals>.<genexpr>)r rx )Zref_apiZ other_apirf Z
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| q4W | j |j | dS )a Assert that the __all__ variable of 'module' contains all public names.
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whether they match the public name convention and were defined in
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what module(s) an API could be defined in in order to be detected as a
public API. One case for this is when 'module' imports part of its public
API from other modules, possibly a C backend (like 'csv' and its '_csv').
The 'extra' argument can be a set of names that wouldn't otherwise be
automatically detected as "public", like objects without a proper
'__module__' attribute. If provided, it will be added to the
automatically detected ones.
The 'blacklist' argument can be a set of names that must not be treated
as part of the public API even though their names indicate otherwise.
Usage:
import bar
import foo
import unittest
from test import support
class MiscTestCase(unittest.TestCase):
def test__all__(self):
support.check__all__(self, foo)
class OtherTestCase(unittest.TestCase):
def test__all__(self):
extra = {'BAR_CONST', 'FOO_CONST'}
blacklist = {'baz'} # Undocumented name.
# bar imports part of its API from _bar.
support.check__all__(self, bar, ('bar', '_bar'),
extra=extra, blacklist=blacklist)
Nr ra )
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r Y nX dS )zARestore Windows ErrorMode or core file behavior to initial value.Nr r )r ro rp rq r r r r r r r r r r r r )rg r r r r r rd rd re r s
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r@ t dY nX d fdd}| j| t| dS )zOverride 'object_to_patch'.'attr_name' with 'new_value'.
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The 'attr_name' should be a valid attribute for 'object_to_patch'.
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s zpatch.<locals>.cleanup)r rj r r Z
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s
r c C sF y ddl }W n tk
r Y nX |j r4tjdddl}|j| S )zi
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is_tracingrs rt r run_in_subinterp)r r r rd rd re r
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s r c C s| ddl m}m}m} |j }|j| xP|jD ]F}| r@|| kr@q.t||}| rPn
|dkrZq.|j|d dkr.|d S q.W dS )a< Check if the compiler components used to build the interpreter exist.
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and return the first missing executable or None when none is found
missing.
r ) ccompilerr spawnN) Z distutilsr r r Z new_compilerZcustomize_compilerZ executablesr Zfind_executable)Z cmd_namesr r r Zcompilerrv r rd rd re r^
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r( } z|jtjkr W Y dd}~X qX tj| |d7 }qW W d|dk rzx*|j|j|jfD ]}|j ||| q`W X |S ) z/Count the number of open file descriptors.
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c @ s( e Zd ZdZdd Zdd Zdd ZdS ) SaveSignalsz
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by the Python signal module: see bpo-13285 for "external" signal
handlers.
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zSaveSignals.__init__c C s4 x.| j D ]$}| jj|}|d kr"q|| j|< qW d S )N)r r getsignalrf )rg r handlerrd rd re saveZ s
zSaveSignals.savec C s* x$| j j D ]\}}| jj|| q W d S )N)rf r r )rg r r rd rd re restoref s zSaveSignals.restoreN)r` ra rb rc rh r r rd rd rd re r D s
r c @ s( e Zd ZdZdd Zdd Zdd ZdS ) FakePathz.Simple implementing of the path protocol.
c C s
|| _ d S )N)r )rg r rd rd re rh n s zFakePath.__init__c C s d| j dS )Nz
<FakePath >)r )rg rd rd re __repr__q s zFakePath.__repr__c C s6 t | jts$t | jtr,t| jtr,| jn| jS d S )N)r r
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