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Tests for POSIX-based L{IReactorProcess} implementations.
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A dummy file object which records when it is closed.
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r r r �close$ s zFakeFile.closec C s | S r r r r r r � __enter__' s zFakeFile.__enter__c C s | � � d S r )r )r
�exc_type� exc_value� tracebackr r r �__exit__* s zFakeFile.__exit__N)�__name__�
__module__� __qualname__�__doc__r
r r r r r r r r s r c @ s$ e Zd ZdZdZdd� Zdd� ZdS )�FakeResourceModulez�
Fake version of L{resource} which hard-codes a particular rlimit for maximum
open files.
@ivar _limit: The value to return for the hard limit of number of open files.
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A fake of L{resource.getrlimit} which returns a pre-determined result.
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Tests for _FDDetector class in twisted.internet.process, which detects
which function to drop in place for the _listOpenFDs method.
@ivar devfs: A flag indicating whether the filesystem fake will indicate
that /dev/fd exists.
@ivar accurateDevFDResults: A flag indicating whether the /dev/fd fake
returns accurate open file information.
@ivar procfs: A flag indicating whether the filesystem fake will indicate
that /proc/<pid>/fd exists.
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Fake os.getpid, always return the same thing
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Fake os.listdir, depending on what mode we're in to simulate behaviour.
@param arg: the directory to list
z /proc/%d/fdz/dev/fd)�0�1�2)�map�strr �procfsr% �devfs�accurateDevFDResults�OSError)r
�arg�accurater r r �listdir` s zFDDetectorTests.listdirc C s2 t | tttd��t| j� ��}| j�|j� |S )aO
This is a mock for L{open}. It keeps track of opened files so extra
descriptors can be returned from the mock for L{os.listdir} when used on
one of the list-of-filedescriptors directories.
A L{FakeFile} is returned which can be closed to remove the new
descriptor from the open list.
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Make the L{resource} module unimportable for the remainder of the
current test method.
N�resource)�sys�modulesr r r r �hideResourceModule} s z"FDDetectorTests.hideResourceModulec C s t |�tjd< dS )a
Make a L{FakeResourceModule} instance importable at the L{resource}
name.
@param limit: The value which will be returned for the hard limit of
number of open files by the fake resource module's C{getrlimit}
function.
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Restore the original resource module to L{sys.modules}.
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�valuer r r �replaceResourceModule� s �z%FDDetectorTests.replaceResourceModulec C sL t �� | _| j| j_| j| j_| j| j_g d�| _| �| jt j
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Set up the tests, giving ourselves a detector object to play with and
setting up its testable knobs to refer to our mocked versions.
�r r � r; N) r � _FDDetector�detectorr1 r% r: r �
addCleanuprB r< r= �getr r r r �setUp� s
zFDDetectorTests.setUpc s@ dd� }dd� }� fdd�}|||g� j _� �|� j �� � dS )z�
L{FDDetector._getImplementation} returns the first method from its
C{_implementations} list which returns results which reflect a newly
opened file descriptor.
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ValueErrorr r r r �failWithException� � zBFDDetectorTests.test_selectFirstWorking.<locals>.failWithExceptionc S � g d�S �NrC r r r r r �failWithWrongResults� rL zEFDDetectorTests.test_selectFirstWorking.<locals>.failWithWrongResultsc s � j d d � S r )r r r r r �correct� s z8FDDetectorTests.test_selectFirstWorking.<locals>.correctN�rF �_implementations�assertIs�_getImplementation)r
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L{FDDetector._getImplementation} returns the last method from its
C{_implementations} list if none of the implementations manage to return
results which reflect a newly opened file descriptor.
c S rM )N)� � � r r r r r rO � rL z=FDDetectorTests.test_selectLast.<locals>.failWithWrongResultsc S rM rN r r r r r �failWithOtherWrongResults� rL zBFDDetectorTests.test_selectLast.<locals>.failWithOtherWrongResultsNrQ )r
rO rY r r r �test_selectLast� s �z FDDetectorTests.test_selectLastc C sL t �� }|jj}|�� |jj}|�� |jj}| �||� | �||� dS )z�
Check that the identity of _listOpenFDs changes after running
_listOpenFDs the first time, but not after the second time it's run.
In other words, check that the monkey patching actually works.
N)r rE � _listOpenFDsr �assertNotEqual� assertEqual)r
rF �first�second�thirdr r r �!test_identityOfListOpenFDsChanges� s z1FDDetectorTests.test_identityOfListOpenFDsChangesc C s< d| _ | �t| jj� d| _ d| _| �g d�| j�� � dS )z�
L{_FDDetector._devFDImplementation} raises L{OSError} if there is no
I{/dev/fd} directory, otherwise it returns the basenames of its children
interpreted as integers.
FTrC N)r, � assertRaisesr. rF �_devFDImplementationr- r] r r r r �test_devFDImplementation� s
z(FDDetectorTests.test_devFDImplementationc C s6 d| _ | �t| jj� d| _ | �g d�| j�� � dS )z�
L{_FDDetector._procFDImplementation} raises L{OSError} if there is no
I{/proc/<pid>/fd} directory, otherwise it returns the basenames of its
children interpreted as integers.
FTrC N)r+ rb r. rF �_procFDImplementationr] r r r r �test_procFDImplementation� s z)FDDetectorTests.test_procFDImplementationc C sT | � d� | �ttd��t| j�� �� | � d� | �ttd��t| j�� �� dS )z�
L{_FDDetector._fallbackFDImplementation} uses the L{resource} module if
it is available, returning a range of integers from 0 to the
minimum of C{1024} and the hard I{NOFILE} limit.
i i r2 N)r? r] �listr5 rF �_fallbackFDImplementationr r r r � test_resourceFDImplementation� s
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L{_FDDetector._fallbackFDImplementation}, the implementation of last
resort, succeeds with a fixed range of integers from 0 to 1024 when the
L{resource} module is not importable.
r2 N)r> r] rg r5 rF rh r r r r � test_fallbackFDImplementation s �z-FDDetectorTests.test_fallbackFDImplementationN)r r r r r �skipr, r- r+ r% r1 r: r> r? rB rI rU rZ ra rd rf ri rj r r r r r$ D s( r$ c @ s$ e Zd ZdZeZdd� Zdd� ZdS )�FileDescriptorTestsz<
Tests for L{twisted.internet.process._listOpenFDs}
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File descriptors returned by L{_listOpenFDs} are mostly open.
This test assumes that zero-legth writes fail with EBADF on closed
file descriptors.
z2fcntl(%d, F_GETFL) failed with unexpected errno %dN)r r[ �fcntl�F_GETFLr. r] �errno�EBADF)r
r �errr r r � test_openFDs" s �����z FileDescriptorTests.test_openFDsc C s� t tj�}t�� }| �|�� |� t�|�� �}| �||�� kd� z|� � | �|t�� � W t� |� nt� |� w | �
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L{_listOpenFDs} lists expected file descriptors.
z>Expected duplicate file descriptor to be greater than originalN) �open�os�devnullr r[ �assertIn�fileno�dup�
assertTruer � assertNotIn)r
r9 �openfdsr r r r �test_expectedFDs4 s
�z$FileDescriptorTests.test_expectedFDsN)r r r r r rk rr r| r r r r rl s
rl )r ro rt r< �typingr r* �__annotations__rm � ImportErrorr �twisted.internetr �twisted.trial.unittestr r r r$ rl r r r r �<module> s& � X