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230 lines
7.2 KiB
230 lines
7.2 KiB
import asyncio
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import asyncio.events as events
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import sys
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import threading
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from heapq import heappop
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def apply(loop=None):
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"""Patch asyncio to make its event loop reentrent."""
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loop = loop or asyncio.get_event_loop()
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if not isinstance(loop, asyncio.BaseEventLoop):
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raise ValueError('Can\'t patch loop of type %s' % type(loop))
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if getattr(loop, '_nest_patched', None):
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# already patched
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return
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_patch_asyncio()
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_patch_loop(loop)
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_patch_task()
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_patch_handle()
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_patch_tornado()
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def _patch_asyncio():
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"""
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Patch asyncio module to use pure Python tasks and futures,
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use module level _current_tasks, all_tasks and patch run method.
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"""
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def run(future, *, debug=False):
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loop = asyncio.get_event_loop()
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loop.set_debug(debug)
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return loop.run_until_complete(future)
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if sys.version_info >= (3, 6, 0):
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asyncio.Task = asyncio.tasks._CTask = asyncio.tasks.Task = \
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asyncio.tasks._PyTask
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asyncio.Future = asyncio.futures._CFuture = asyncio.futures.Future = \
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asyncio.futures._PyFuture
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if sys.version_info < (3, 7, 0):
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asyncio.tasks._current_tasks = asyncio.tasks.Task._current_tasks # noqa
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asyncio.all_tasks = asyncio.tasks.Task.all_tasks # noqa
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if not hasattr(asyncio, '_run_orig'):
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asyncio._run_orig = getattr(asyncio, 'run', None)
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asyncio.run = run
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def _patch_loop(loop):
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"""Patch loop to make it reentrent."""
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def run_forever(self):
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if sys.version_info >= (3, 7, 0):
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set_coro_tracking = self._set_coroutine_origin_tracking
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else:
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set_coro_tracking = self._set_coroutine_wrapper
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self._check_closed()
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old_thread_id = self._thread_id
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old_running_loop = events._get_running_loop()
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set_coro_tracking(self._debug)
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self._thread_id = threading.get_ident()
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if self._asyncgens is not None:
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old_agen_hooks = sys.get_asyncgen_hooks()
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sys.set_asyncgen_hooks(
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firstiter=self._asyncgen_firstiter_hook,
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finalizer=self._asyncgen_finalizer_hook)
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try:
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events._set_running_loop(self)
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while True:
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self._run_once()
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if self._stopping:
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break
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finally:
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self._stopping = False
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self._thread_id = old_thread_id
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events._set_running_loop(old_running_loop)
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set_coro_tracking(False)
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if self._asyncgens is not None:
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sys.set_asyncgen_hooks(*old_agen_hooks)
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def run_until_complete(self, future):
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old_running_loop = events._get_running_loop()
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try:
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self._check_closed()
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events._set_running_loop(self)
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f = asyncio.ensure_future(future, loop=self)
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if f is not future:
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f._log_destroy_pending = False
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while not f.done():
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self._run_once()
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if self._stopping:
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break
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if not f.done():
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raise RuntimeError(
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'Event loop stopped before Future completed.')
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return f.result()
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finally:
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events._set_running_loop(old_running_loop)
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def _run_once(self):
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"""
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Simplified re-implementation of asyncio's _run_once that
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runs handles as they become ready.
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"""
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now = self.time()
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ready = self._ready
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scheduled = self._scheduled
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while scheduled and scheduled[0]._cancelled:
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heappop(scheduled)
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if ready or self._stopping:
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timeout = 0
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elif scheduled:
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timeout = min(max(0, scheduled[0]._when - self.time()), 86400)
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else:
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timeout = None
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event_list = self._selector.select(timeout)
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self._process_events(event_list)
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end_time = self.time() + self._clock_resolution
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while scheduled and scheduled[0]._when < end_time:
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handle = heappop(scheduled)
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ready.append(handle)
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for _ in range(len(ready)):
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if not ready:
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break
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handle = ready.popleft()
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if not handle._cancelled:
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handle._run()
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handle = None
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def _check_running(self):
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"""Do not throw exception if loop is already running."""
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pass
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cls = loop.__class__
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cls._run_once_orig = cls._run_once
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cls._run_once = _run_once
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cls._run_forever_orig = cls.run_forever
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cls.run_forever = run_forever
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cls._run_until_complete_orig = cls.run_until_complete
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cls.run_until_complete = run_until_complete
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cls._check_running = _check_running
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cls._check_runnung = _check_running # typo in Python 3.7 source
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cls._nest_patched = True
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def _patch_task():
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"""Patch the Task's step and enter/leave methods to make it reentrant."""
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def step(task, exc=None):
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curr_task = curr_tasks.get(task._loop)
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try:
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step_orig(task, exc)
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finally:
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if curr_task is None:
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curr_tasks.pop(task._loop, None)
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else:
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curr_tasks[task._loop] = curr_task
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Task = asyncio.Task
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if sys.version_info >= (3, 7, 0):
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def enter_task(loop, task):
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curr_tasks[loop] = task
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def leave_task(loop, task):
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curr_tasks.pop(loop, None)
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asyncio.tasks._enter_task = enter_task
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asyncio.tasks._leave_task = leave_task
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curr_tasks = asyncio.tasks._current_tasks
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step_orig = Task._Task__step
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Task._Task__step = step
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else:
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curr_tasks = Task._current_tasks
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step_orig = Task._step
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Task._step = step
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def _patch_handle():
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"""Patch Handle to allow recursive calls."""
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def update_from_context(ctx):
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"""Copy context ctx to currently active context."""
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for var in ctx:
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var.set(ctx[var])
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def run(self):
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"""
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Run the callback in a sub-context, then copy any sub-context vars
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over to the Handle's context.
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"""
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try:
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ctx = self._context.copy()
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ctx.run(self._callback, *self._args)
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if ctx:
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self._context.run(update_from_context, ctx)
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except (SystemExit, KeyboardInterrupt):
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raise
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except BaseException as exc:
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cb = format_helpers._format_callback_source(
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self._callback, self._args)
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msg = 'Exception in callback {}'.format(cb)
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context = {
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'message': msg,
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'exception': exc,
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'handle': self,
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}
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if self._source_traceback:
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context['source_traceback'] = self._source_traceback
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self._loop.call_exception_handler(context)
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self = None
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if sys.version_info >= (3, 7, 0):
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from asyncio import format_helpers
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events.Handle._run = run
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def _patch_tornado():
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"""
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If tornado is imported before nest_asyncio, make tornado aware of
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the pure-Python asyncio Future.
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"""
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if 'tornado' in sys.modules:
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import tornado.concurrent as tc
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tc.Future = asyncio.Future
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if asyncio.Future not in tc.FUTURES:
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tc.FUTURES += (asyncio.Future,)
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