Edit File: unix_events.cpython-37.pyc
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Adds signal handling and UNIX Domain Socket support to SelectorEventLoop. Nc s t � �|� i | _d S )N)�super�__init__�_signal_handlers)�self�selector)� __class__r r r 2 s z _UnixSelectorEventLoop.__init__c s^ t � �� t�� s2xFt| j�D ]}| �|� q W n(| jrZtjd| �d�t | d� | j� � d S )NzClosing the loop z@ on interpreter shutdown stage, skipping signal handlers removal)�source) r �close�sys� is_finalizing�listr �remove_signal_handler�warnings�warn�ResourceWarning�clear)r �sig)r r r r 6 s z _UnixSelectorEventLoop.closec C s" x |D ]}|sq| � |� qW d S )N)�_handle_signal)r �datar r r r �_process_self_dataD s z)_UnixSelectorEventLoop._process_self_datac G sL t �|�st �|�r td��| �|� | �� yt�| j� � � W n2 t t fk rt } zt t |���W dd}~X Y nX t�||| d�}|| j|< y t�|t� t�|d� W n� t k �rF } zz| j|= | j�syt�d� W n4 t t fk �r } zt�d|� W dd}~X Y nX |jtjk�r4t d|� d���n� W dd}~X Y nX dS )z�Add a handler for a signal. UNIX only. Raise ValueError if the signal number is invalid or uncatchable. 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_protocol�_closing�_pausedrf r� rz rx �S_ISFIFOry �S_ISCHRr2 � set_blocking� call_soon�connection_made� _add_reader� _read_readyr � _set_result_unless_cancelled)r rv rI rJ rK rL �mode)r r r r � s. z _UnixReadPipeTransport.__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� q�|�d� n | jd k r�|�d� n |�d� d� d � |��S ) N�closed�closingzfd=� _selector�polling�idle�openz<{}>� )r r� r� �appendr� r� �getattrr� r �_test_selector_event� selectorsZ EVENT_READ�format�join)r r7 r r� r r r �__repr__� s" z _UnixReadPipeTransport.__repr__c C s� yt �| j| j�}W nD ttfk r, Y n� tk rX } z| �|d� W d d }~X Y n^X |rl| j� |� nJ| j � � r�t � d| � d| _| j �| j� | j �| jj� | j �| jd � d S )Nz"Fatal read error on pipe transportz%r was closed by peerT)rf �readr� �max_sizer� r� r3 � _fatal_errorr� Z data_receivedr� � get_debugr r7 r� �_remove_readerr� Z eof_received�_call_connection_lost)r r* r< r r r r� � s z"_UnixReadPipeTransport._read_readyc C s> | j s | jrd S 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|�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� zfd=r� r� r� zbufsize=r� z<{}>r� )r r� r� r� r� r� r� r� r r� r� Z EVENT_WRITE�get_write_buffer_sizer� r� )r r7 r r� rZ r r r r� W s& z _UnixWritePipeTransport.__repr__c C s t | j�S )N)�lenr� )r r r r r� o s z-_UnixWritePipeTransport.get_write_buffer_sizec C s6 | j �� rt�d| � | jr*| �t� � n| �� d S )Nz%r was closed by peer)r� r� r r7 r� r� �BrokenPipeError)r r r r r� r s z#_UnixWritePipeTransport._read_readyc C s2 t |tttf�s tt|���t |t�r.t|�}|s6d S | jsB| jrj| jtj krXt � d� | jd7 _d S | j �syt �| j|�}W nV ttfk r� d}Y n< tk r� } z | jd7 _| �|d� d S d }~X Y nX |t|�kr�d S |dk�rt|�|d � }| j�| j| j� | j |7 _ | �� d S )Nz=pipe closed by peer or os.write(pipe, data) raised exception.r r z#Fatal write error on pipe transport)rE �bytesr� � memoryviewre �reprr� r� r Z!LOG_THRESHOLD_FOR_CONNLOST_WRITESr �warningr� rf �writer� r� r� rU r� r� r� Z _add_writer� _write_readyZ_maybe_pause_protocol)r r* �nr< r r r r� { s4 z _UnixWritePipeTransport.writec C s� | j std��yt�| j| j �}W nj ttfk r: Y n� tk r� } z6| j �� | j d7 _ | j � | j� | � |d� W d d }~X Y nfX |t | j �kr�| j �� | j � | j� | �� | jr�| j �| j� | �d � d S |dkr�| j d |�= d S )NzData should not be emptyr z#Fatal write error on pipe transportr )r� re rf r� r� r� r� rU r' r� r� �_remove_writerr� r� Z_maybe_resume_protocolr� r� r� )r r� r< r r r r� � s( z$_UnixWritePipeTransport._write_readyc C s dS )NTr )r r r r � can_write_eof� s z%_UnixWritePipeTransport.can_write_eofc C sB | j r d S | jst�d| _ | js>| j�| j� | j�| jd � d S )NT) r� r� re r� r� r� r� r� r� )r r r r � write_eof� s z!_UnixWritePipeTransport.write_eofc C s || _ d S )N)r� )r rJ r r r r� � s z$_UnixWritePipeTransport.set_protocolc C s | j S )N)r� )r r r r r� � s z$_UnixWritePipeTransport.get_protocolc C s | j S )N)r� )r r r r r� � s z"_UnixWritePipeTransport.is_closingc C s | j d k r| js| �� d S )N)r� r� r� )r r r r r � s z _UnixWritePipeTransport.closec C s. | j d k r*tjd| ��t| d� | j �� d S )Nzunclosed transport )r )r� r$ r% r& r )r r r r r� � s z _UnixWritePipeTransport.__del__c C s | � d � d S )N)r� )r r r r �abort� s z _UnixWritePipeTransport.abort� Fatal error on pipe transportc C sN t |t�r(| j�� r@tjd| |dd� n| j�||| | jd�� | �|� d S )Nz%r: %sT)r� )r� r� rp rJ ) rE r3 r� 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 )NT) r� r� r� r� r� r' r� r� r� )r r< r r r r� � s z _UnixWritePipeTransport._closec C s4 z| j �|� W d | j�� d | _d | _ d | _X d S )N)r� r� r� r 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 rN / s" % ! rN c @ s e Zd Zdd� ZdS )rR c K s� d }|t jkrt�� \}}zPt j|f||||d|d�|��| _|d k rh|�� t|�� d|d�| j_ d }W d |d k r�|�� |�� X d S )NF)rV rW rX rY Zuniversal_newlinesrZ �wb)� buffering) � subprocess�PIPErh Z socketpair�Popen�_procr r� �detachrW ) r r; rV rW rX rY rZ r[ Zstdin_wr r r �_start� s z _UnixSubprocessTransport._startN)r� r� r� r� r r r r rR � s rR c @ s@ e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � 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 r_ r: r; r r r rS ) 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.N)r� )r r_ r r r �remove_child_handler4 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. N)r� )r rv r r r � attach_loop< 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. N)r� )r r r r r F s zAbstractChildWatcher.closec C s t � �dS )zdEnter the watcher's context and allow starting new processes This function must return selfN)r� )r r r r � __enter__M s z AbstractChildWatcher.__enter__c C s t � �dS )zExit the watcher's contextN)r� )r �a�b�cr r r �__exit__S s z AbstractChildWatcher.__exit__N) r� r� r� r� rS r� r� r r� r� r r r r r 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 )N)r� � _callbacks)r r r r r Z s zBaseChildWatcher.__init__c C s | � d � d S )N)r� )r r r r r ^ s zBaseChildWatcher.closec C s t � �d S )N)r� )r � expected_pidr r r � _do_waitpida s z BaseChildWatcher._do_waitpidc C s t � �d S )N)r� )r r r r �_do_waitpid_alld 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)rE r ZAbstractEventLoopre r� r� r$ r% �RuntimeWarningr# r/ �SIGCHLDr> � _sig_chldr� )r rv r r r r� g s z BaseChildWatcher.attach_loopc C sF y | � � W n4 tk r@ } z| j�d|d�� W d d }~X Y nX d S )Nz$Unknown exception in SIGCHLD handler)r� r� )r� rU r� r� )r r< r r r r� { s zBaseChildWatcher._sig_chldc C s2 t �|�rt �|� S t �|�r*t �|�S |S d S )N)rf � WIFSIGNALED�WTERMSIG� WIFEXITED� WEXITSTATUS)r �statusr r r �_compute_returncode� s z$BaseChildWatcher._compute_returncodeN) r� r� r� r r r� r� r� r� r r r r r r� X 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 )N)r� r' r r )r )r r r r � s zSafeChildWatcher.closec C s | S )Nr )r r r r r� � s zSafeChildWatcher.__enter__c C s d S )Nr )r r� r� r� r r r r� � s zSafeChildWatcher.__exit__c G s. | j d krtd��||f| j|< | �|� d S )NzICannot add child handler, the child watcher does not have a loop attached)r� r4 r� r� )r r_ r: r; r r r rS � s z"SafeChildWatcher.add_child_handlerc C s& y | j |= dS tk r dS X d S )NTF)r� r@ )r r_ r r r r� � s z%SafeChildWatcher.remove_child_handlerc C s" x t | j�D ]}| �|� q W d S )N)r" r� r� )r r_ r r r r� � s z SafeChildWatcher._do_waitpid_allc C s� |dks t �yt�|tj�\}}W n( tk rJ |}d}t�d|� Y n0X |dkrXd S | �|�}| j� � rzt� d||� y| j � |�\}}W n. t k r� | j� � r�tjd|dd� Y nX |||f|�� d S )Nr � z8Unknown child process pid %d, will report returncode 255z$process %s exited with returncode %sz'Child watcher got an unexpected pid: %rT)r� )re rf �waitpid�WNOHANG�ChildProcessErrorr r� r r� r� r� r� �popr@ )r r� r_ r r` r: r; r r r r� � s, z SafeChildWatcher._do_waitpid) r� r� r� r� r r� r� rS r� r� r� r� r r )r r r � s r c sT e Zd ZdZ� fdd�Z� fdd�Zdd� Zdd � Zd d � Zd d � Z dd� Z � Z S )r aW 'Fast' child watcher implementation. This implementation reaps every terminated processes by calling os.waitpid(-1) directly, possibly breaking other code spawning processes and waiting for their termination. There is no noticeable overhead when handling a big number of children (O(1) each time a child terminates). c s$ t � �� t�� | _i | _d| _d S )Nr )r r � threadingZLock�_lock�_zombies�_forks)r )r r r r � s zFastChildWatcher.__init__c s" | j �� | j�� t� �� d S )N)r� r' r r r )r )r r r r � s zFastChildWatcher.closec C s$ | j � | jd7 _| S Q R X d S )Nr )r r )r r r r r� � s zFastChildWatcher.__enter__c C sT | j �8 | jd8 _| js"| js&d S t| j�}| j�� W d Q R X t�d|� d S )Nr z5Caught subprocesses termination from unknown pids: %s)r r r r5 r' r r� )r r� r� r� Zcollateral_victimsr r r r� � s zFastChildWatcher.__exit__c G sz | j std��| jd kr td��| j�: y| j�|�}W n" tk rZ ||f| j|< d S X W d Q R X |||f|�� d S )Nz Must use the context managerzICannot add child handler, the child watcher does not have a loop attached) r re r� r4 r r r r@ r� )r r_ r: r; r` r r r rS s z"FastChildWatcher.add_child_handlerc C s& y | j |= dS tk r dS X d S )NTF)r� r@ )r r_ r r r r� s z%FastChildWatcher.remove_child_handlerc C s� x�yt �dt j�\}}W n tk r, d S X |dkr:d S | �|�}| j�v y| j�|�\}}W nB tk r� | j r�|| j |< | j � � r�t �d||� wd }Y nX | j � � r�t �d||� W d Q R X |d kr�t �d||� q|||f|�� qW d S )Nr, r z,unknown process %s exited with returncode %sz$process %s exited with returncode %sz8Caught subprocess termination from unknown pid: %d -> %d)rf r r r r r r� r r@ r r r� r� r r� r� )r r_ r r` r: r; r r r r� ' s6 z FastChildWatcher._do_waitpid_all) r� r� r� r� r r r� r� rS r� r� r� r r )r r r � s r c sH e Zd ZdZeZ� fdd�Zdd� Z� fdd�Zdd � Z d d � Z � Z S ) �_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.c s t � �� d | _d S )N)r r �_watcher)r )r r r r V s z$_UnixDefaultEventLoopPolicy.__init__c C sH t j�8 | jd kr:t� | _tt�� tj�r:| j�| j j � W d Q R X d S )N) r r r r rE r �current_thread� _MainThreadr� �_localr� )r r r r � _init_watcherZ 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_loopr rE r r r r� )r rv )r r r r b s z*_UnixDefaultEventLoopPolicy.set_event_loopc C s | j dkr| �� | j S )zzGet the watcher for child processes. If not yet set, a SafeChildWatcher object is automatically created. N)r r )r r r r rP p s z-_UnixDefaultEventLoopPolicy.get_child_watcherc C s4 |dkst |t�st�| jdk r*| j�� || _dS )z$Set the watcher for child processes.N)rE r re r r )r r\ r r r �set_child_watcherz s z-_UnixDefaultEventLoopPolicy.set_child_watcher) r� r� r� r� r Z _loop_factoryr r r rP r r� r r )r r r R s r )-r� r8 r� rf r� r/ rh rx r� r r r$ � r r r r r r r r r �logr �__all__r� � ImportErrorr ZBaseSelectorEventLoopr Z ReadTransportrH Z_FlowControlMixinZWriteTransportrN ZBaseSubprocessTransportrR r r� r r ZBaseDefaultEventLoopPolicyr r r r r r r �<module> sR | JF=On3
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