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Edit File: unix_events.cpython-38.pyc
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r rR � s rR c s� e Zd Zd%� fdd� Zdd� Zdd� Zdd � Zd d � Zd d � Zdd� Z dd� Z dd� Z dd� Z dd� Z dd� Zejfdd�Zd d � Zd&d d �Zd'd!d"�Zd#d$� Z� ZS )(rY Nc s� t � �||� || jd< || _|�� | _|| _t� | _d| _ d| _ t � | j�j }t�|�}t�|�}t�|�} |s�|s�| s�d | _d | _d | _td��t �| jd� | j�| jj| � | s�|r�tj�d�s�| j�| jj| j| j� |d k r�| j�t j |d � d S )NrT r Fz?Pipe transport is only for pipes, sockets and character devicesZaix) r r r� r� r; r� r� � bytearray�_buffer� _conn_lostr� rx r� r� r� r� r� r� r< r� r� r� r� r& �platform� startswithr� r� r r� ) r r� rT rU rV rW r� Zis_charZis_fifoZ is_socketr! r r r ? s: � �z _UnixWritePipeTransport.__init__c C s� | j jg}| jd kr |�d� n| jr0|�d� |�d| j� �� t| jdd �}| jd k r�|d k r�t� || jt j �}|r�|�d� n |�d� | � � }|�d|� �� n | jd k r�|�d� n |�d� d � d �|��S ) Nr� r� r� r� r� r� zbufsize=r� r� r� )r" r� r� r� r� r� r� r� r r� r� Z EVENT_WRITE�get_write_buffer_sizer� r� )r rA r r� rh r r r r� d s, � z _UnixWritePipeTransport.__repr__c C s t | j�S r )�lenr� r� r r r r� | s z-_UnixWritePipeTransport.get_write_buffer_sizec C s6 | j �� rt�d| � | jr*| �t� � n| �� d S )Nr� )r� r� r rA r� r� �BrokenPipeErrorr� r r r r� s z#_UnixWritePipeTransport._read_readyc C sR t |tttf�s tt|���t |t�r.t|�}|s6d S | jsB| jrj| jtj krXt � d� | jd7 _d S | j �s8zt �| j|�}W nt ttfk r� d}Y nZ ttfk r� � Y nB tk r� } z$| jd7 _| �|d� W Y �d S d }~X Y nX |t|�k�r d S |dk�r&t|�|d � }| j�| j| j� | j |7 _ | �� d S )Nz=pipe closed by peer or os.write(pipe, data) raised exception.r r �#Fatal write error on pipe transport)rO �bytesr� � memoryviewrw �reprr� r� r Z!LOG_THRESHOLD_FOR_CONNLOST_WRITESr �warningr� rx �writer� r� r� ra rb rc r� r� r� Z _add_writer� _write_readyZ_maybe_pause_protocol)r r1 �nrF r r r r � s8 z _UnixWritePipeTransport.writec C s | j std��zt�| j| j �}W n� ttfk r: Y n� ttfk rR � Y n� t k r� } z6| j � � | j d7 _ | j � | j� | �|d� W 5 d }~X Y nhX |t| j �kr�| j � � | j � | j� | �� | jr�| j �| j� | �d � d S |dk�r | j d |�= d S )NzData should not be emptyr r r )r� rw rx r r� r� r� ra rb rc r- r� r� �_remove_writerr� r� Z_maybe_resume_protocolr� r� r� )r r rF r r r r � s, z$_UnixWritePipeTransport._write_readyc C s dS r� r r� r r r � can_write_eof� s z%_UnixWritePipeTransport.can_write_eofc C sB | j r d S | jst�d| _ | js>| j�| j� | j�| jd � d S r� ) r� r� rw r� r� r� r� r� r� r� r r r � write_eof� s z!_UnixWritePipeTransport.write_eofc C s || _ d S r r� r� r r r r� � s z$_UnixWritePipeTransport.set_protocolc C s | j S r r� r� r r r r� � s z$_UnixWritePipeTransport.get_protocolc C s | j S r r� r� r r r r� � s z"_UnixWritePipeTransport.is_closingc C s | j d k r| js| �� d S r )r� r� r r� r r r r% � s z _UnixWritePipeTransport.closec C s, | j d k r(|d| ��t| d� | j �� d S r� r� r� r r r r� � s z _UnixWritePipeTransport.__del__c C s | � d � d S r )r� r� r r r �abort� s z _UnixWritePipeTransport.abortr� c C sN t |t�r(| j�� r@tjd| |dd� n| j�||| | jd�� | �|� d S r� ) rO r= r� r� r r� r� r� r� r� r r r r� � s �z$_UnixWritePipeTransport._fatal_errorc C sF d| _ | jr| j�| j� | j�� | j�| j� | j�| j|� d S r� ) r� r� r� r r� r- r� r� r� r� r r r r� � s z _UnixWritePipeTransport._closec C s4 z| j�|� W 5 | j �� d | _ d | _d | _X d S r r� r� r r r r� � s z-_UnixWritePipeTransport._call_connection_lost)NN)r� )N)r� r� r� r r� r� r� r r r r r� r� r� r% r* r+ r� r r� r� r� r� r r r! r rY < s" % # rY c @ s e Zd Zdd� ZdS )r^ c K s� d }|t jkrt�� \}}zPt j|f||||d|d�|��| _|d k rh|�� t|�� d|d�| j_ d }W 5 |d k r�|�� |�� X d S )NF)rd re rf rg Zuniversal_newlinesrh �wb)� buffering) � subprocess�PIPErz Z socketpairr% �Popen�_procr� �detachre ) r rE rd re rf rg rh ri Zstdin_wr r r �_start s. � ��z _UnixSubprocessTransport._startN)r� r� r� r r r r r r^ s r^ c @ sH e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dS )r aH Abstract base class for monitoring child processes. Objects derived from this class monitor a collection of subprocesses and report their termination or interruption by a signal. New callbacks are registered with .add_child_handler(). Starting a new process must be done within a 'with' block to allow the watcher to suspend its activity until the new process if fully registered (this is needed to prevent a race condition in some implementations). Example: with watcher: proc = subprocess.Popen("sleep 1") watcher.add_child_handler(proc.pid, callback) Notes: Implementations of this class must be thread-safe. Since child watcher objects may catch the SIGCHLD signal and call waitpid(-1), there should be only one active object per process. c G s t � �dS )a Register a new child handler. Arrange for callback(pid, returncode, *args) to be called when process 'pid' terminates. Specifying another callback for the same process replaces the previous handler. Note: callback() must be thread-safe. N��NotImplementedError�r rn rD rE r r r r_ 9 s z&AbstractChildWatcher.add_child_handlerc C s t � �dS )z�Removes the handler for process 'pid'. The function returns True if the handler was successfully removed, False if there was nothing to remove.Nr �r rn r r r �remove_child_handlerD s z)AbstractChildWatcher.remove_child_handlerc C s t � �dS )z�Attach the watcher to an event loop. If the watcher was previously attached to an event loop, then it is first detached before attaching to the new loop. Note: loop may be None. Nr �r r� r r r � attach_loopL s z AbstractChildWatcher.attach_loopc C s t � �dS )zlClose the watcher. This must be called to make sure that any underlying resource is freed. Nr r� r r r r% V s zAbstractChildWatcher.closec C s t � �dS )z�Return ``True`` if the watcher is active and is used by the event loop. Return True if the watcher is installed and ready to handle process exit notifications. Nr r� r r r r\ ] s z AbstractChildWatcher.is_activec C s t � �dS )zdEnter the watcher's context and allow starting new processes This function must return selfNr r� r r r � __enter__f s z AbstractChildWatcher.__enter__c C s t � �dS )zExit the watcher's contextNr �r �a�b�cr r r �__exit__l s z AbstractChildWatcher.__exit__N) r� r� r� r� r_ r r r% r\ r r! r r r r r " s r c C s2 t �| �rt �| � S t �| �r*t �| �S | S d S r )rx � WIFSIGNALED�WTERMSIG� WIFEXITED� WEXITSTATUS)�statusr r r �_compute_returncodeq s r' c @ sD e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d� Z dS )�BaseChildWatcherc C s d | _ i | _d S r )r� � _callbacksr� r r r r � s zBaseChildWatcher.__init__c C s | � d � d S r )r r� r r r r% � s zBaseChildWatcher.closec C s | j d k o| j �� S r )r� Z is_runningr� r r r r\ � s zBaseChildWatcher.is_activec C s t � �d S r r )r � expected_pidr r r � _do_waitpid� s z BaseChildWatcher._do_waitpidc C s t � �d S r r r� r r r �_do_waitpid_all� s z BaseChildWatcher._do_waitpid_allc C s~ |d kst |tj�st�| jd k r<|d kr<| jr<t�dt� | jd k rT| j� t j � || _|d k rz|� t j | j � | �� d S )NzCA loop is being detached from a child watcher with pending handlers)rO r ZAbstractEventLooprw r� r) r* r+ �RuntimeWarningr) r9 �SIGCHLDrH � _sig_chldr, r r r r r � s � z BaseChildWatcher.attach_loopc C s^ z | � � W nL ttfk r& � Y n4 tk rX } z| j�d|d�� W 5 d }~X Y nX d S )N�$Unknown exception in SIGCHLD handler)r� r� )r, ra rb rc r� r� r� r r r r/ � s �zBaseChildWatcher._sig_chldN) r� r� r� r r% r\ r+ r, r r/ r r r r r( s r( c sP e Zd ZdZ� fdd�Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z � Z S )r ad 'Safe' child watcher implementation. This implementation avoids disrupting other code spawning processes by polling explicitly each process in the SIGCHLD handler instead of calling os.waitpid(-1). This is a safe solution but it has a significant overhead when handling a big number of children (O(n) each time SIGCHLD is raised) c s | j �� t� �� d S r )r) r- r r% r� r! r r r% � s zSafeChildWatcher.closec C s | S r r r� r r r r � s zSafeChildWatcher.__enter__c C s d S r r r r r r r! � s zSafeChildWatcher.__exit__c G s ||f| j |< | �|� d S r )r) r+ r r r r r_ � s z"SafeChildWatcher.add_child_handlerc C s* z| j |= W dS tk r$ Y dS X d S �NTF�r) rJ r r r r r � s z%SafeChildWatcher.remove_child_handlerc C s t | j�D ]}| �|� q d S r �r( r) r+ r r r r r, � s z SafeChildWatcher._do_waitpid_allc C s� |dks t �zt�|tj�\}}W n( tk rJ |}d}t�d|� Y n.X |dkrXd S t|�}| j� � rxt� d||� z| j � |�\}}W n. t k r� | j� � r�tjd|dd� Y nX |||f|�� d S )Nr � �8Unknown child process pid %d, will report returncode 255�$process %s exited with returncode %s�'Child watcher got an unexpected pid: %rTr� )rw rx �waitpid�WNOHANG�ChildProcessErrorr r r' r� r� r� r) �poprJ )r r* rn r& ro rD rE r r r r+ � s6 � � � z SafeChildWatcher._do_waitpid) r� r� r� r� r% r r! r_ r r, r+ r� r r r! r r � s r c sT e Zd ZdZ� fdd�Z� fdd�Zdd� Zdd � Zd d � Zd d � Z dd� Z � Z S )r aW 'Fast' child watcher implementation. This implementation reaps every terminated processes by calling os.waitpid(-1) directly, possibly breaking other code spawning processes and waiting for their termination. There is no noticeable overhead when handling a big number of children (O(1) each time a child terminates). c s$ t � �� t�� | _i | _d| _d S r� )r r � threadingZLock�_lock�_zombies�_forksr� r! r r r s zFastChildWatcher.__init__c s" | j �� | j�� t� �� d S r )r) r- r> r r% r� r! r r r% s zFastChildWatcher.closec C s0 | j � | jd7 _| W 5 Q R � S Q R X d S )Nr )r= r? r� r r r r s zFastChildWatcher.__enter__c C s^ | j �B | jd8 _| js"| js0W 5 Q R � d S t| j�}| j�� W 5 Q R X t�d|� d S )Nr z5Caught subprocesses termination from unknown pids: %s)r= r? r> r? r- r r )r r r r Zcollateral_victimsr r r r! s �zFastChildWatcher.__exit__c G st | j std��| j�F z| j�|�}W n. tk rT ||f| j|< Y W 5 Q R � d S X W 5 Q R X |||f|�� d S )Nz Must use the context manager)r? rw r= r> r; rJ r) )r rn rD rE ro r r r r_ ' s z"FastChildWatcher.add_child_handlerc C s* z| j |= W dS tk r$ Y dS X d S r1 r2 r r r r r 5 s z%FastChildWatcher.remove_child_handlerc C s� zt �dt j�\}}W n tk r, Y d S X |dkr:d S t|�}| j�� z| j�|�\}}W nN tk r� | j r�|| j |< | j � � r�t �d||� Y W 5 Q R � q d }Y nX | j � � r�t �d||� W 5 Q R X |d kr�t �d||� q |||f|�� q d S )Nr3 r z,unknown process %s exited with returncode %sr6 z8Caught subprocess termination from unknown pid: %d -> %d)rx r8 r9 r: r' r= r) r; rJ r? r> r� r� r r� r )r rn r& ro rD rE r r r r, < s@ � � �z FastChildWatcher._do_waitpid_all) r� r� r� r� r r% r r! r_ r r, r� r r r! r r � s r c @ sh e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dd� Z dd� ZdS )r a~ A watcher that doesn't require running loop in the main thread. This implementation registers a SIGCHLD signal handler on instantiation (which may conflict with other code that install own handler for this signal). The solution is safe but it has a significant overhead when handling a big number of processes (*O(n)* each time a SIGCHLD is received). c C s i | _ d | _d S r )r) �_saved_sighandlerr� r r r r z s z MultiLoopChildWatcher.__init__c C s | j d k S r )r@ r� r r r r\ ~ s z MultiLoopChildWatcher.is_activec C sT | j �� | jd krd S t�tj�}|| jkr:t�d� nt�tj| j� d | _d S )Nz+SIGCHLD handler was changed by outside code) r) r- r@ r9 � getsignalr. r/ r r )r rN r r r r% � s zMultiLoopChildWatcher.closec C s | S r r r� r r r r � s z MultiLoopChildWatcher.__enter__c C s d S r r �r �exc_typeZexc_valZexc_tbr r r r! � s z MultiLoopChildWatcher.__exit__c G s& t �� }|||f| j|< | �|� d S r )r �get_running_loopr) r+ )r rn rD rE r� r r r r_ � s z'MultiLoopChildWatcher.add_child_handlerc C s* z| j |= W dS tk r$ Y dS X d S r1 r2 r r r r r � s z*MultiLoopChildWatcher.remove_child_handlerc C sN | j d k rd S t�tj| j�| _ | j d kr<t�d� tj| _ t�tjd� d S )NzaPrevious SIGCHLD handler was set by non-Python code, restore to default handler on watcher close.F)r@ r9 r. r/ r r rM r@ r r r r r � s z!MultiLoopChildWatcher.attach_loopc C s t | j�D ]}| �|� q d S r r3 r r r r r, � s z%MultiLoopChildWatcher._do_waitpid_allc C s� |dks t �zt�|tj�\}}W n, tk rN |}d}t�d|� d}Y nX |dkr\d S t|�}d}z| j� |�\}}}W n$ t k r� tjd|dd� Y nHX |� � r�t�d||� n.|r�|� � r�t� d ||� |j|||f|�� d S ) Nr r4 r5 FTr7 r� �%Loop %r that handles pid %r is closedr6 )rw rx r8 r9 r: r r r' r) r; rJ � is_closedr� r� rm ) r r* rn r& ro Z debug_logr� rD rE r r r r+ � s< � � �z!MultiLoopChildWatcher._do_waitpidc C sL z | � � W n: ttfk r& � Y n" tk rF tjddd� Y nX d S )Nr0 Tr� )r, ra rb rc r r )r r r r r r r/ � s z MultiLoopChildWatcher._sig_chldN)r� r� r� r� r r\ r% r r! r_ r r r, r+ r/ r r r r r g s %r c @ sn e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z e j fdd�Z dd� Z dd� Zdd� Zdd� ZdS )r aA Threaded child watcher implementation. The watcher uses a thread per process for waiting for the process finish. It doesn't require subscription on POSIX signal but a thread creation is not free. The watcher has O(1) complexity, its performance doesn't depend on amount of spawn processes. c C s t �d�| _i | _d S r� )� itertoolsr� � _pid_counter�_threadsr� r r r r � s z ThreadedChildWatcher.__init__c C s dS r� r r� r r r r\ � s z ThreadedChildWatcher.is_activec C s | � � d S r )� _join_threadsr� r r r r% � s zThreadedChildWatcher.closec C s. dd� t | j�� �D �}|D ] }|�� q dS )z%Internal: Join all non-daemon threadsc S s g | ]}|� � r|js|�qS r )�is_alive�daemon��.0�threadr r r � <listcomp>� s �z6ThreadedChildWatcher._join_threads.<locals>.<listcomp>N)r( rI �valuesr� )r �threadsrO r r r rJ � s z"ThreadedChildWatcher._join_threadsc C s | S r r r� r r r r s z ThreadedChildWatcher.__enter__c C s d S r r rB r r r r! s z ThreadedChildWatcher.__exit__c C s6 dd� t | j�� �D �}|r2|| j� d�t| d� d S )Nc S s g | ]}|� � r|�qS r )rK rM r r r rP s �z0ThreadedChildWatcher.__del__.<locals>.<listcomp>z0 has registered but not finished child processesr# )r( rI rQ r" r, )r r� rR r r r r� s �z ThreadedChildWatcher.__del__c G sF t �� }tj| jdt| j�� �||||fdd�}|| j|< |�� d S )Nzwaitpid-T)�target�namerE rL ) r rD r< ZThreadr+ �nextrH rI �start)r rn rD rE r� rO r r r r_ s � z&ThreadedChildWatcher.add_child_handlerc C s dS r� r r r r r r s z)ThreadedChildWatcher.remove_child_handlerc C s d S r r r r r r r s z ThreadedChildWatcher.attach_loopc C s� |dks t �zt�|d�\}}W n( tk rH |}d}t�d|� Y n X t|�}|�� rht�d||� |� � r�t�d||� n|j |||f|�� | j � |� d S )Nr r4 r5 r6 rE ) rw rx r8 r: r r r' r� r� rF rm rI r; )r r� r* rD rE rn r& ro r r r r+ " s( � �z ThreadedChildWatcher._do_waitpidN)r� r� r� r� r r\ r% rJ r r! r* r+ r� r_ r r r+ r r r r r � s r c sH e Zd ZdZeZ� fdd�Zdd� Z� fdd�Zdd � Z d d � Z � Z S ) �_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.c s t � �� d | _d S r )r r �_watcherr� r! r r r A s z$_UnixDefaultEventLoopPolicy.__init__c C sH t j�8 | jd kr:t� | _tt�� tj�r:| j�| j j � W 5 Q R X d S r ) r r= rX r rO r< �current_thread� _MainThreadr �_localr� r� r r r � _init_watcherE s �z)_UnixDefaultEventLoopPolicy._init_watcherc s6 t � �|� | jdk r2tt�� tj�r2| j�|� dS )z�Set the event loop. As a side effect, if a child watcher was set before, then calling .set_event_loop() from the main thread will call .attach_loop(loop) on the child watcher. N)r �set_event_looprX rO r< rY rZ r r r! r r r] M s �z*_UnixDefaultEventLoopPolicy.set_event_loopc C s | j dkr| �� | j S )z~Get the watcher for child processes. If not yet set, a ThreadedChildWatcher object is automatically created. N)rX r\ r� r r r r[ [ s z-_UnixDefaultEventLoopPolicy.get_child_watcherc C s4 |dkst |t�st�| jdk r*| j�� || _dS )z$Set the watcher for child processes.N)rO r rw rX r% )r rj r r r �set_child_watchere s z-_UnixDefaultEventLoopPolicy.set_child_watcher) r� r� r� r� r Z _loop_factoryr r\ r] r[ r^ r� r r r! r rW = s rW )2r� rB r� rG rx r� r9 rz r� r r& r< r* � r r r r r r r r r r �logr �__all__r� � ImportErrorr ZBaseSelectorEventLoopr Z ReadTransportrR Z_FlowControlMixinZWriteTransportrY ZBaseSubprocessTransportr^ r r' r( r r r r ZBaseDefaultEventLoopPolicyrW r r r r r r �<module> s` � NO5Ji}Y3