JFIF$        dd7 

Viewing File: /usr/lib64/python3.9/unittest/async_case.py

import asyncio
import inspect

from .case import TestCase


class IsolatedAsyncioTestCase(TestCase):
    # Names intentionally have a long prefix
    # to reduce a chance of clashing with user-defined attributes
    # from inherited test case
    #
    # The class doesn't call loop.run_until_complete(self.setUp()) and family
    # but uses a different approach:
    # 1. create a long-running task that reads self.setUp()
    #    awaitable from queue along with a future
    # 2. await the awaitable object passing in and set the result
    #    into the future object
    # 3. Outer code puts the awaitable and the future object into a queue
    #    with waiting for the future
    # The trick is necessary because every run_until_complete() call
    # creates a new task with embedded ContextVar context.
    # To share contextvars between setUp(), test and tearDown() we need to execute
    # them inside the same task.

    # Note: the test case modifies event loop policy if the policy was not instantiated
    # yet.
    # asyncio.get_event_loop_policy() creates a default policy on demand but never
    # returns None
    # I believe this is not an issue in user level tests but python itself for testing
    # should reset a policy in every test module
    # by calling asyncio.set_event_loop_policy(None) in tearDownModule()

    def __init__(self, methodName='runTest'):
        super().__init__(methodName)
        self._asyncioTestLoop = None
        self._asyncioCallsQueue = None

    async def asyncSetUp(self):
        pass

    async def asyncTearDown(self):
        pass

    def addAsyncCleanup(self, func, /, *args, **kwargs):
        # A trivial trampoline to addCleanup()
        # the function exists because it has a different semantics
        # and signature:
        # addCleanup() accepts regular functions
        # but addAsyncCleanup() accepts coroutines
        #
        # We intentionally don't add inspect.iscoroutinefunction() check
        # for func argument because there is no way
        # to check for async function reliably:
        # 1. It can be "async def func()" itself
        # 2. Class can implement "async def __call__()" method
        # 3. Regular "def func()" that returns awaitable object
        self.addCleanup(*(func, *args), **kwargs)

    def _callSetUp(self):
        self.setUp()
        self._callAsync(self.asyncSetUp)

    def _callTestMethod(self, method):
        self._callMaybeAsync(method)

    def _callTearDown(self):
        self._callAsync(self.asyncTearDown)
        self.tearDown()

    def _callCleanup(self, function, *args, **kwargs):
        self._callMaybeAsync(function, *args, **kwargs)

    def _callAsync(self, func, /, *args, **kwargs):
        assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
        ret = func(*args, **kwargs)
        assert inspect.isawaitable(ret), f'{func!r} returned non-awaitable'
        fut = self._asyncioTestLoop.create_future()
        self._asyncioCallsQueue.put_nowait((fut, ret))
        return self._asyncioTestLoop.run_until_complete(fut)

    def _callMaybeAsync(self, func, /, *args, **kwargs):
        assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
        ret = func(*args, **kwargs)
        if inspect.isawaitable(ret):
            fut = self._asyncioTestLoop.create_future()
            self._asyncioCallsQueue.put_nowait((fut, ret))
            return self._asyncioTestLoop.run_until_complete(fut)
        else:
            return ret

    async def _asyncioLoopRunner(self, fut):
        self._asyncioCallsQueue = queue = asyncio.Queue()
        fut.set_result(None)
        while True:
            query = await queue.get()
            queue.task_done()
            if query is None:
                return
            fut, awaitable = query
            try:
                ret = await awaitable
                if not fut.cancelled():
                    fut.set_result(ret)
            except (SystemExit, KeyboardInterrupt):
                raise
            except (BaseException, asyncio.CancelledError) as ex:
                if not fut.cancelled():
                    fut.set_exception(ex)

    def _setupAsyncioLoop(self):
        assert self._asyncioTestLoop is None, 'asyncio test loop already initialized'
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        loop.set_debug(True)
        self._asyncioTestLoop = loop
        fut = loop.create_future()
        self._asyncioCallsTask = loop.create_task(self._asyncioLoopRunner(fut))
        loop.run_until_complete(fut)

    def _tearDownAsyncioLoop(self):
        assert self._asyncioTestLoop is not None, 'asyncio test loop is not initialized'
        loop = self._asyncioTestLoop
        self._asyncioTestLoop = None
        self._asyncioCallsQueue.put_nowait(None)
        loop.run_until_complete(self._asyncioCallsQueue.join())

        try:
            # cancel all tasks
            to_cancel = asyncio.all_tasks(loop)
            if not to_cancel:
                return

            for task in to_cancel:
                task.cancel()

            loop.run_until_complete(
                asyncio.gather(*to_cancel, return_exceptions=True))

            for task in to_cancel:
                if task.cancelled():
                    continue
                if task.exception() is not None:
                    loop.call_exception_handler({
                        'message': 'unhandled exception during test shutdown',
                        'exception': task.exception(),
                        'task': task,
                    })
            # shutdown asyncgens
            loop.run_until_complete(loop.shutdown_asyncgens())
        finally:
            # Prevent our executor environment from leaking to future tests.
            loop.run_until_complete(loop.shutdown_default_executor())
            asyncio.set_event_loop(None)
            loop.close()

    def run(self, result=None):
        self._setupAsyncioLoop()
        try:
            return super().run(result)
        finally:
            self._tearDownAsyncioLoop()

    def debug(self):
        self._setupAsyncioLoop()
        super().debug()
        self._tearDownAsyncioLoop()

    def __del__(self):
        if self._asyncioTestLoop is not None:
            self._tearDownAsyncioLoop()
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg