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d Z d d d d Z d d d d d d Z d d Z d f d d Z d d Z S)r z A coroutine wrapped in a Future.TNc C s+ | d k r t j } n | j j | S)zReturn the currently running task in an event loop or None.
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} q Wn | S)a Return the list of stack frames for this task's coroutine.
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frames.
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r> zNo stack for %rrK Nz)Traceback for %r (most recent call last):z%Stack for %r (most recent call last):end )setrJ f_linenof_code co_filenameco_namer1 linecache
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zTask.print_stackc C sB | j r d S| j d k r5 | j j r5 d Sn d | _ d S)a Request that this task cancel itself.
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acted upon, delaying cancellation of the task or preventing
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raise a different exception.
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not return True (unless the task was already cancelled). A
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r | j S| j | | j t j Wd | j Xd S)a Wait for the single Future or coroutine to complete, with timeout.
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zSet of Futures is empty.r Nc s d 8 d k sM t k sM t k r | j r | j d k r d k rf j n j s j d q n d S)Nr r )r r cancelled exceptionrd rc rk )rH )counterr~ r r r r _on_completion s
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This differs from PEP 3148; the proper way to use this is:
for f in as_completed(fs):
result = yield from f # The 'yield from' may raise.
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z expect a list of futures, not %sNc s" h | ] } t | d q S)r )r )r rH )r r r r! s z as_completed..r )Queuer c s9 x( D] } | j j d q W j d S)N)r
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| Dd HSWd | j Xd S)z9Coroutine that completes after a given time (in seconds).r Nr )r r7 r r Z _set_result_unless_cancelledrd )Zdelayru r rv hr r r r s
c C s t j d t t | d | S)zWrap a coroutine in a future.
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z;asyncio.async() function is deprecated, use ensure_future()r )warningswarnDeprecationWarningr )coro_or_futurer r r r r s c C s t | t j r@ | d k r< | | j k r< t d n | St j | r | d k rj t j } n | j | } | j
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N)Z __await__)Z awaitabler r r r , s r c s: e Z d Z d Z d d f d d Z d d Z S)_GatheringFuturezHelper for gather().
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r Nc s t j d | | | _ d S)Nr )r( r) _children)r2 childrenr )r0 r r r) > s z_GatheringFuture.__init__c C s2 | j r d Sx | j D] } | j q Wd S)NFT)rc r rd )r2 Zchildr r r rd B s
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c s` t | d | } | j r" | S| j } t j d | f d d } | j | S)a= Wait for a future, shielding it from cancellation.
The statement
res = yield from shield(something())
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res = yield from something()
*except* that if the coroutine containing it is cancelled, the
task running in something() is not cancelled. From the POV of
something(), the cancellation did not happen. But its caller is
still cancelled, so the yield-from expression still raises
CancelledError. Note: If something() is cancelled by other means
this will still cancel shield().
If you want to completely ignore cancellation (not recommended)
you can combine shield() with a try/except clause, as follows:
try:
res = yield from shield(something())
except CancelledError:
res = None
r c s j r) | j s% | j n d S| j rB j n; | j } | d k rj j | n j | j d S)N)r r rd rn rk ru )innerra )r r r r s
z shield.._done_callback)r rc r r r7 rq )r r r r r )r r r s
c sV t j s t d n t j j f d d } j | S)zsSubmit a coroutine object to a given event loop.
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c C s+ | d k r t j } n t | d | S)ah A factory which produce a context manager with timeout.
Useful in cases when you want to apply timeout logic around block
of code or in cases when asyncio.wait_for is not suitable.
For example:
>>> with asyncio.timeout(0.001):
... yield from coro()
timeout: timeout value in seconds
loop: asyncio compatible event loop
Nr )r r _Timeout)r r r r r r s c @ s@ e Z d Z d d Z d d Z d d Z d d Z d S)
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z_Timeout.__init__c C sX t j d | j | _ | j d k r6 t d n | j j | j | j | _ | S)Nr z4Timeout context manager should be used inside a task) r r r r rp r r _cancel_taskr )r2 r r r __enter__ s z_Timeout.__enter__c C sY | t j k r6 | j r6 d | _ d | _ t j n | j j d | _ d | _ d S)N)r rg r r r r rd )r2 exc_typeZexc_valZexc_tbr r r __exit__ s
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