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futures.cpython-37.pyc
B p�!=�p� @ s� d Z dZddlZddlZddlZddlZddlmZ ddlm Z ddlm Z ej Z ej Z ej Z ejZejZejZejZejd ZG dd � d �ZeZd d � Zd d � Zdd� Zdd� Zdd� Zdd�dd�Zy ddl Z W n e k r� Y n X e j ZZ dS )z.A Future class similar to the one in PEP 3148.)�CancelledError� TimeoutError�InvalidStateError�Future� wrap_future�isfuture� N� )� base_futures)�events)�format_helpersc @ s� e Zd ZdZeZdZdZdZdZ dZ dZ dd�dd�Z e jZdd� Zd d � Zed d � �Zejd d � �Zdd� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd �d d �Z d d � Z d!d"� Z d#d$� Z d%d&� Z e Z!dS )'r a, This class is *almost* compatible with concurrent.futures.Future. Differences: - This class is not thread-safe. - result() and exception() do not take a timeout argument and raise an exception when the future isn't done yet. - Callbacks registered with add_done_callback() are always called via the event loop's call_soon(). - This class is not compatible with the wait() and as_completed() methods in the concurrent.futures package. (In Python 3.4 or later we may be able to unify the implementations.) NF)�loopc C s@ |dkrt �� | _n|| _g | _| j�� r<t�t�d��| _ dS )z�Initialize the future. The optional event_loop argument allows explicitly setting the event loop object used by the future. If it's not provided, the future uses the default event loop. Nr ) r �get_event_loop�_loop� _callbacksZ get_debugr � extract_stack�sys� _getframe�_source_traceback)�selfr � r �4/opt/alt/python37/lib64/python3.7/asyncio/futures.py�__init__G s zFuture.__init__c C s d� | jjd�| �� ��S )Nz<{} {}>� )�format� __class__�__name__�join� _repr_info)r r r r �__repr__Y s zFuture.__repr__c C sF | j s d S | j}| jj� d�|| d�}| jr6| j|d< | j�|� d S )Nz exception was never retrieved)�message� exception�futureZsource_traceback)�_Future__log_traceback� _exceptionr r r r Zcall_exception_handler)r �exc�contextr r r �__del__] s zFuture.__del__c C s | j S )N)r" )r r r r �_log_tracebackm s zFuture._log_tracebackc C s t |�rtd��d| _d S )Nz'_log_traceback can only be set to FalseF)�bool� ValueErrorr" )r �valr r r r' q s c C s | j }|dkrtd��|S )z-Return the event loop the Future is bound to.Nz!Future object is not initialized.)r � RuntimeError)r r r r r �get_loopw s zFuture.get_loopc C s& d| _ | jtkrdS t| _| �� dS )z�Cancel the future and schedule callbacks. If the future is already done or cancelled, return False. Otherwise, change the future's state to cancelled, schedule the callbacks and return True. FT)r" �_state�_PENDING� _CANCELLED�_Future__schedule_callbacks)r r r r �cancel~ s z Future.cancelc C sL | j dd� }|sdS g | j dd�< x"|D ]\}}| jj|| |d� q*W dS )z�Internal: Ask the event loop to call all callbacks. The callbacks are scheduled to be called as soon as possible. Also clears the callback list. N)r% )r r � call_soon)r Z callbacks�callback�ctxr r r Z__schedule_callbacks� s zFuture.__schedule_callbacksc C s | j tkS )z(Return True if the future was cancelled.)r- r/ )r r r r � cancelled� s zFuture.cancelledc C s | j tkS )z�Return True if the future is done. Done means either that a result / exception are available, or that the future was cancelled. )r- r. )r r r r �done� s z Future.donec C s< | j tkrt�| j tkr td��d| _| jdk r6| j�| jS )a Return the result this future represents. If the future has been cancelled, raises CancelledError. If the future's result isn't yet available, raises InvalidStateError. If the future is done and has an exception set, this exception is raised. zResult is not ready.FN)r- r/ r � _FINISHEDr r" r# �_result)r r r r �result� s z Future.resultc C s, | j tkrt�| j tkr td��d| _| jS )a& Return the exception that was set on this future. The exception (or None if no exception was set) is returned only if the future is done. If the future has been cancelled, raises CancelledError. If the future isn't done yet, raises InvalidStateError. zException is not set.F)r- r/ r r7 r r" r# )r r r r r � s zFuture.exception)r% c C sB | j tkr | jj|| |d� n |dkr.t�� }| j�||f� dS )z�Add a callback to be run when the future becomes done. The callback is called with a single argument - the future object. If the future is already done when this is called, the callback is scheduled with call_soon. )r% N)r- r. r r2 � contextvarsZ copy_contextr �append)r �fnr% r r r �add_done_callback� s zFuture.add_done_callbackc s< � fdd�| j D �}t| j �t|� }|r8|| j dd�< |S )z}Remove all instances of a callback from the "call when done" list. Returns the number of callbacks removed. c s g | ]\}}|� kr||f�qS r r )�.0�fr4 )r< r r � <listcomp>� s z/Future.remove_done_callback.<locals>.<listcomp>N)r �len)r r< Zfiltered_callbacksZ removed_countr )r< r �remove_done_callback� s zFuture.remove_done_callbackc C s4 | j tkr td�| j | ���|| _t| _ | �� dS )z�Mark the future done and set its result. If the future is already done when this method is called, raises InvalidStateError. z{}: {!r}N)r- r. r r r8 r7 r0 )r r9 r r r � set_result� s zFuture.set_resultc C s^ | j tkr td�| j | ���t|t�r,|� }t|�tkr@td��|| _t | _ | � � d| _ dS )z�Mark the future done and set an exception. If the future is already done when this method is called, raises InvalidStateError. z{}: {!r}zPStopIteration interacts badly with generators and cannot be raised into a FutureTN) r- r. r r � isinstance�type� StopIteration� TypeErrorr# r7 r0 r" )r r r r r � set_exception� s zFuture.set_exceptionc c s, | � � sd| _| V | � � s$td��| �� S )NTz await wasn't used with future)r6 �_asyncio_future_blockingr+ r9 )r r r r � __await__ s zFuture.__await__)"r � __module__� __qualname__�__doc__r. r- r8 r# r r rI r" r r Z_future_repr_infor r r& �propertyr' �setterr, r1 r0 r5 r6 r9 r r= rB rC rH rJ �__iter__r r r r r s6 r c C s, y | j }W n tk r Y nX |� S | jS )N)r, �AttributeErrorr )�futr, r r r � _get_loop s rS c C s | � � r dS | �|� dS )z?Helper setting the result only if the future was not cancelled.N)r5 rC )rR r9 r r r � _set_result_unless_cancelled s rT c C sZ |� � s t�|�� r | �� | �� s(dS |�� }|dk rD| �|� n|�� }| �|� dS )z8Copy state from a future to a concurrent.futures.Future.N) r6 �AssertionErrorr5 r1 Z set_running_or_notify_cancelr rH r9 rC )� concurrent�sourcer r9 r r r � _set_concurrent_future_state& s rX c C sh | � � s t�|�� rdS |� � r$t�| �� r6|�� n.| �� }|dk rR|�|� n| �� }|�|� dS )zqInternal helper to copy state from another Future. The other Future may be a concurrent.futures.Future. N)r6 rU r5 r1 r rH r9 rC )rW �destr r9 r r r �_copy_future_state5 s rZ c s� t ��s t�tjj�s td��t ��s<t�tjj�s<td��t ��rLt��nd�t ��r`t��nd�dd� � ���fdd�}� ���fdd �}��|� ��|� dS ) a Chain two futures so that when one completes, so does the other. The result (or exception) of source will be copied to destination. If destination is cancelled, source gets cancelled too. Compatible with both asyncio.Future and concurrent.futures.Future. z(A future is required for source argumentz-A future is required for destination argumentNc S s" t | �rt|| � n t| |� d S )N)r rZ rX )r! �otherr r r � _set_stateY s z!_chain_future.<locals>._set_statec s2 | � � r.�d ks�� kr"��� n ���j� d S )N)r5 r1 �call_soon_threadsafe)� destination)� dest_looprW � source_loopr r �_call_check_cancel_ s z)_chain_future.<locals>._call_check_cancelc sJ �� � r �d k r ��� r d S �d ks,��kr8� �| � n��� �| � d S )N)r5 Z is_closedr] )rW )r\ r_ r^ r` r r �_call_set_statef s z&_chain_future.<locals>._call_set_state)r rD rV �futuresr rG rS r= )rW r^ ra rb r )r\ r_ r^ rW r` r � _chain_futureI s rd )r c C sN t | �r | S t| tjj�s(td| ����|dkr8t�� }|�� }t | |� |S )z&Wrap concurrent.futures.Future object.z+concurrent.futures.Future is expected, got N) r rD rV rc r rU r r Z create_futurerd )r! r Z new_futurer r r r s s r ) rM �__all__Zconcurrent.futuresrV r: Zloggingr � r r r r r r r r. r/ r7 �DEBUGZ STACK_DEBUGr Z _PyFuturerS rT rX rZ rd r Z_asyncio� ImportErrorZ_CFuturer r r r �<module> s< q *
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