o Q_@sdZddlZddlmZddlZddlZddlZddlmZddl Z ddl m Z m Z m Z m Z mZe dZGdddeZejZejefZd e d efd d ZGd ddejZeZde de d e fddZeZd*ddZddded dfddZddded dfddZ ddd e e e!e ee ej"fd dfd!d"Z#e j$dd#d$e d#gdfd dfd%d&Z%e j$ddd$e dgdfd dfd'd&Z%ddd$e d(d dfd)d&Z%dS)+aUtilities for working with ``Future`` objects. Tornado previously provided its own ``Future`` class, but now uses `asyncio.Future`. This module contains utility functions for working with `asyncio.Future` in a way that is backwards-compatible with Tornado's old ``Future`` implementation. While this module is an important part of Tornado's internal implementation, applications rarely need to interact with it directly. N)futures)app_log)AnyCallableOptionalTupleUnion_Tc@s eZdZdS)ReturnValueIgnoredErrorN)__name__ __module__ __qualname__rr4/usr/lib/python3/dist-packages/tornado/concurrent.pyr *sr xreturncCs t|tSN) isinstanceFUTURES)rrrr is_future4s rc@sBeZdZdedefdededdfddZdd edd fd d Zd S) DummyExecutorfn.argskwargsrfutures.Future[_T]cOsFt}z t|||i|W|Sty"t|tY|Swr)rFuture"future_set_result_unless_cancelled Exceptionfuture_set_exc_infosysexc_info)selfrrrfuturerrrsubmit9s zDummyExecutor.submitTwaitNcCdSrr)r!r$rrrshutdownCszDummyExecutor.shutdown)T) r r r rr rr#boolr&rrrrr8s   rrrcsddtdtdtfffdd }|rrtdt|dkr#||dSt|dkr0td t||S) aEDecorator to run a synchronous method asynchronously on an executor. Returns a future. The executor to be used is determined by the ``executor`` attributes of ``self``. To use a different attribute name, pass a keyword argument to the decorator:: @run_on_executor(executor='_thread_pool') def foo(self): pass This decorator should not be confused with the similarly-named `.IOLoop.run_in_executor`. In general, using ``run_in_executor`` when *calling* a blocking method is recommended instead of using this decorator when *defining* a method. If compatibility with older versions of Tornado is required, consider defining an executor and using ``executor.submit()`` at the call site. .. versionchanged:: 4.2 Added keyword arguments to use alternative attributes. .. versionchanged:: 5.0 Always uses the current IOLoop instead of ``self.io_loop``. .. versionchanged:: 5.1 Returns a `.Future` compatible with ``await`` instead of a `concurrent.futures.Future`. .. deprecated:: 5.1 The ``callback`` argument is deprecated and will be removed in 6.0. The decorator itself is discouraged in new code but will not be removed in 6.0. .. versionchanged:: 6.0 The ``callback`` argument was removed. rr.c s:ddtdtdtdtdtffdd }|S)Nexecutorr!rrrcs4t}t|j|g|Ri|}t|||Sr)rgetattrr# chain_future)r!rr async_future conc_futurer(rrrwrapperws  zCrun_on_executor..run_on_executor_decorator..wrapper)get functoolswrapsrr)rr.rr-rrun_on_executor_decoratorts "z2run_on_executor..run_on_executor_decoratorz*cannot combine positional and keyword argsrzexpected 1 argument, got %d)rr ValueErrorlen)rrr3rr2rrun_on_executorJs*    r7a Future[_T]bcsHd fdd }ttrt|dSddlm}||dS) ajChain two futures together so that when one completes, so does the other. The result (success or failure) of ``a`` will be copied to ``b``, unless ``b`` has already been completed or cancelled by the time ``a`` finishes. .. versionchanged:: 5.0 Now accepts both Tornado/asyncio `Future` objects and `concurrent.futures.Future`. r"r9rNcsp|usJr dStdr dur tdSdur/dSdS)Nr )donehasattrr r exception set_exception set_resultresult)r"r8r:rrcopys  zchain_future..copyr)IOLoop)r"r9rN)rrfuture_add_done_callbacktornado.iolooprCcurrent add_future)r8r:rBrCrrArr*s   r*r"z%Union[futures.Future[_T], Future[_T]]valuecCs|s ||dSdS)zSet the given ``value`` as the `Future`'s result, if not cancelled. Avoids ``asyncio.InvalidStateError`` when calling ``set_result()`` on a cancelled `asyncio.Future`. .. versionadded:: 5.0 N) cancelledr?)r"rHrrrrs rexccCs(|s ||dStjd|ddS)aSet the given ``exc`` as the `Future`'s exception. If the Future is already canceled, logs the exception instead. If this logging is not desired, the caller should explicitly check the state of the Future and call ``Future.set_exception`` instead of this wrapper. Avoids ``asyncio.InvalidStateError`` when calling ``set_exception()`` on a cancelled `asyncio.Future`. .. versionadded:: 6.0 z$Exception after Future was cancelled)r N)rIr>rerror)r"rJrrr%future_set_exception_unless_cancelledsrLr cCs&|ddur tdt||ddS)aSet the given ``exc_info`` as the `Future`'s exception. Understands both `asyncio.Future` and the extensions in older versions of Tornado to enable better tracebacks on Python 2. .. versionadded:: 5.0 .. versionchanged:: 6.0 If the future is already cancelled, this function is a no-op. (previously ``asyncio.InvalidStateError`` would be raised) r4Nz,future_set_exc_info called with no exception)rrL)r"r rrrrs rrcallbackcCr%rrr"rMrrrrDrDcCr%rrrNrrrrDrO).NcCs"|r ||dS||dS)aLArrange to call ``callback`` when ``future`` is complete. ``callback`` is invoked with one argument, the ``future``. If ``future`` is already done, ``callback`` is invoked immediately. This may differ from the behavior of ``Future.add_done_callback``, which makes no such guarantee. .. versionadded:: 5.0 N)r;add_done_callbackrNrrrrDs )r8r9r:r9rN)&__doc__asyncio concurrentrr0rtypes tornado.logrtypingrrrrrTypeVarr rr rrr'rExecutorrdummy_executorr7object _NO_RESULTr*r BaseExceptionrLtype TracebackTyperoverloadrDrrrrs    ? !