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e y{ Y dS w e j ZZ dS )z.A Future class similar to the one in PEP 3148.)�Future� wrap_future�isfuture� N)� GenericAlias� )� base_futures)�events)�
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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.)
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t �� | _n|| _g | _| j�� r t�t�d��| _ dS dS )z�Initialize the future.
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zFuture.__del__c C s | j S �N)r& r r r r �_log_tracebackp s zFuture._log_tracebackc C s |rt d��d| _d S )Nz'_log_traceback can only be set to FalseF)�
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c C s | j }|du r td��|S )z-Return the event loop the Future is bound to.Nz!Future object is not initialized.)r � RuntimeErrorr r r r �get_loopz s zFuture.get_loopc C s2 | j du r
t�� }nt�| j �}| j|_d| _|S )z�Create the CancelledError to raise if the Future is cancelled.
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N)�_cancel_messager �CancelledError�_cancelled_exc� __context__�r r) r r r �_make_cancelled_error� s
z Future._make_cancelled_errorc C s, d| _ | jtkr
dS t| _|| _| �� dS )z�Cancel the future and schedule callbacks.
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Future.cancelc C sH | j dd� }|s dS g | j dd�< |D ]
\}}| jj|| |d� qdS )z�Internal: Ask the event loop to call all callbacks.
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N�r* )r r � call_soon)r � callbacks�callback�ctxr r r �__schedule_callbacks� s �zFuture.__schedule_callbacksc C s
| j tkS )z(Return True if the future was cancelled.)r8 r: r r r r � cancelled� s
zFuture.cancelledc C s
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z Future.donec C sN | j tkr | �� }|�| j tkrt�d��d| _| jdur$| j�| j ��| j
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Future.resultc C s6 | j tkr | �� }|�| j tkrt�d��d| _| jS )a& Return the exception that was set on this future.
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InvalidStateError.
zException is not set.F)r8 r: r7 rF r rG r& r' r6 r r r r# � s
zFuture.exceptionr> c C sD | j tkr| jj|| |d� dS |du rt�� }| 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)r8 r9 r r? � contextvars� copy_contextr �append)r �fnr* r r r �add_done_callback� s
zFuture.add_done_callbackc s< � fdd�| j D �}t| j �t|� }|r || j dd�< |S )z}Remove all instances of a callback from the "call when done" list.
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�z/Future.remove_done_callback.<locals>.<listcomp>N)r �len)r rO �filtered_callbacks�
removed_countr rS r �remove_done_callback� s
�zFuture.remove_done_callbackc C s8 | j tkrt�| j � d| ����|| _t| _ | �� dS )z�Mark the future done and set its result.
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set_result� s
zFuture.set_resultc C sj | j tkrt�| j � d| ����t|t�r|� }t|�tu r"td��|| _|j | _
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dS )z�Mark the future done and set an exception.
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rY zPStopIteration interacts badly with generators and cannot be raised into a FutureTN)r8 r9 r rG �
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__module__� __qualname__�__doc__r9 r8 rJ r' r r r2 r4 ra r& r r �_future_repr_infor r! r+ � classmethodr �__class_getitem__�propertyr- �setterr1 r7 r= r; rD rE rK r# rP rX rZ r` rb �__iter__r r r r r sD
r c C s& z| j }W |� S ty Y | jS w r, )r1 �AttributeErrorr )�futr1 r r r � _get_loop) s ��rn c C s | � � rdS | �|� dS )z?Helper setting the result only if the future was not cancelled.N)rD rZ )rm rK r r r � _set_result_unless_cancelled5 s ro c C sT t | �}|tjju rtj| j� S |tjju r tj| j� S |tjju r(tj| j� S | S r, )r\ �
concurrent�futuresr3 r �args� TimeoutErrorrG )r) � exc_classr r r �_convert_future_exc< s ru c C s` |� � sJ �|�� r| �� | �� sdS |�� }|dur%| �t|�� dS |�� }| �|� dS )z8Copy state from a future to a concurrent.futures.Future.N) rE rD r= � set_running_or_notify_cancelr# r` ru rK rZ )rp �sourcer# rK r r r � _set_concurrent_future_stateH s rx c C sp | � � sJ �|�� r dS |� � rJ �| �� r |�� dS | �� }|dur-|�t|�� dS | �� }|�|� dS )zqInternal helper to copy state from another Future.
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N)rE rD r= r# r` ru rK rZ )rw �destr# rK r r r �_copy_future_stateW s rz c s� t ��st�tjj�std��t ��s t�tjj�s td��t ��r&t��nd�t ��r0t��nd�dd� � ���fdd�}� ���fdd �}��|� ��|� dS )
a Chain two futures so that when one completes, so does the other.
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