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� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd�dd�Z z ddl Z W n e y� Y n 0 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.)
NF��loopc C s@ |du rt �� | _n|| _g | _| j�� r<t�t�d��| _ 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 t |�rtd��d| _d S )Nz'_log_traceback can only be set to FalseF)�bool�
ValueErrorr$ )r �valr r r r* t s c C s | j }|du rtd��|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 rt�� }n t�| 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| _ | jtkrdS t| _|| _| �� dS )z�Cancel the future and schedule callbacks.
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Future.cancelc C sH | j dd� }|sdS g | j dd�< |D ]\}}| jj|| |d� q(dS )z�Internal: Ask the event loop to call all callbacks.
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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.)r6 r8 r r r r � cancelled� s zFuture.cancelledc C s
| j tkS )z�Return True if the future is done.
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)r6 r7 r r r r �done� s z Future.donec C sF | j tkr| �� }|�| j tkr*t�d��d| _| jdur@| j�| jS )a Return the result this future represents.
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zResult is not ready.FN) r6 r8 r5 � _FINISHEDr �InvalidStateErrorr$ r% �_resultr4 r r r �result� s
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Future.resultc C s6 | j tkr| �� }|�| j tkr*t�d��d| _| jS )a& Return the exception that was set on this future.
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InvalidStateError.
zException is not set.F)r6 r8 r5 rB r rC r$ r% r4 r r r r" � s
zFuture.exceptionr< c C sB | j tkr | jj|| |d� n |du r.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)r6 r7 r r= � 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.
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c s g | ]\}}|� kr||f�qS r r )�.0�fr? �rH r r �
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�zFuture.remove_done_callbackc C s8 | j tkr t�| j � d| ����|| _t| _ | �� dS )z�Mark the future done and set its result.
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� d| _ dS )z�Mark the future done and set an exception.
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rc c C s | � � r dS | �|� dS )z?Helper setting the result only if the future was not cancelled.N)r@ rQ )rb rE r r r � _set_result_unless_cancelled4 s rd c C sX t | �}|tjju r tj| j� S |tjju r8tj| j� S |tjju rPtj| j� S | S d S r) )rS �
concurrent�futuresr1 r �args� TimeoutErrorrC )r& Z exc_classr r r �_convert_future_exc; s ri c C sR |� � r| �� | �� s dS |�� }|dur<| �t|�� n|�� }| �|� dS )z8Copy state from a future to a concurrent.futures.Future.N)r@ r; � set_running_or_notify_cancelr" rV ri rE rQ )re �sourcer" rE r r r � _set_concurrent_future_stateG s rl c C sT |� � r dS | � � r |�� n2| �� }|dur>|�t|�� n| �� }|�|� dS )zqInternal helper to copy state from another Future.
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rn 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.
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Compatible with both asyncio.Future and concurrent.futures.Future.
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