284 lines
8.6 KiB
Python
284 lines
8.6 KiB
Python
__all__ = ['coroutine',
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'iscoroutinefunction', 'iscoroutine']
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import functools
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import inspect
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import opcode
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import os
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import sys
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import traceback
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import types
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from collections.abc import Awaitable, Coroutine
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from . import constants
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from . import events
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from . import base_futures
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from .log import logger
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def _is_debug_mode():
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# If you set _DEBUG to true, @coroutine will wrap the resulting
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# generator objects in a CoroWrapper instance (defined below). That
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# instance will log a message when the generator is never iterated
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# over, which may happen when you forget to use "yield from" with a
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# coroutine call. Note that the value of the _DEBUG flag is taken
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# when the decorator is used, so to be of any use it must be set
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# before you define your coroutines. A downside of using this feature
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# is that tracebacks show entries for the CoroWrapper.__next__ method
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# when _DEBUG is true.
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return (sys.flags.dev_mode
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or (not sys.flags.ignore_environment
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and bool(os.environ.get('PYTHONASYNCIODEBUG'))))
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_DEBUG = _is_debug_mode()
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def debug_wrapper(gen):
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# This function is called from 'sys.set_coroutine_wrapper'.
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# We only wrap here coroutines defined via 'async def' syntax.
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# Generator-based coroutines are wrapped in @coroutine
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# decorator.
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return CoroWrapper(gen, None)
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class CoroWrapper:
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# Wrapper for coroutine object in _DEBUG mode.
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def __init__(self, gen, func=None):
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assert inspect.isgenerator(gen) or inspect.iscoroutine(gen), gen
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self.gen = gen
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self.func = func # Used to unwrap @coroutine decorator
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self._source_traceback = events.extract_stack(sys._getframe(1))
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self.__name__ = getattr(gen, '__name__', None)
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self.__qualname__ = getattr(gen, '__qualname__', None)
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def __repr__(self):
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coro_repr = _format_coroutine(self)
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if self._source_traceback:
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frame = self._source_traceback[-1]
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coro_repr += ', created at %s:%s' % (frame[0], frame[1])
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return '<%s %s>' % (self.__class__.__name__, coro_repr)
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def __iter__(self):
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return self
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def __next__(self):
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return self.gen.send(None)
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def send(self, value):
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return self.gen.send(value)
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def throw(self, type, value=None, traceback=None):
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return self.gen.throw(type, value, traceback)
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def close(self):
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return self.gen.close()
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@property
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def gi_frame(self):
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return self.gen.gi_frame
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@property
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def gi_running(self):
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return self.gen.gi_running
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@property
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def gi_code(self):
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return self.gen.gi_code
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def __await__(self):
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cr_await = getattr(self.gen, 'cr_await', None)
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if cr_await is not None:
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raise RuntimeError(
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"Cannot await on coroutine {!r} while it's "
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"awaiting for {!r}".format(self.gen, cr_await))
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return self
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@property
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def gi_yieldfrom(self):
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return self.gen.gi_yieldfrom
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@property
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def cr_await(self):
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return self.gen.cr_await
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@property
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def cr_running(self):
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return self.gen.cr_running
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@property
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def cr_code(self):
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return self.gen.cr_code
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@property
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def cr_frame(self):
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return self.gen.cr_frame
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def __del__(self):
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# Be careful accessing self.gen.frame -- self.gen might not exist.
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gen = getattr(self, 'gen', None)
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frame = getattr(gen, 'gi_frame', None)
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if frame is None:
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frame = getattr(gen, 'cr_frame', None)
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if frame is not None and frame.f_lasti == -1:
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msg = '%r was never yielded from' % self
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tb = getattr(self, '_source_traceback', ())
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if tb:
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tb = ''.join(traceback.format_list(tb))
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msg += (f'\nCoroutine object created at '
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f'(most recent call last, truncated to '
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f'{constants.DEBUG_STACK_DEPTH} last lines):\n')
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msg += tb.rstrip()
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logger.error(msg)
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def coroutine(func):
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"""Decorator to mark coroutines.
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If the coroutine is not yielded from before it is destroyed,
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an error message is logged.
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"""
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if inspect.iscoroutinefunction(func):
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# In Python 3.5 that's all we need to do for coroutines
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# defined with "async def".
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# Wrapping in CoroWrapper will happen via
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# 'sys.set_coroutine_wrapper' function.
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return func
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if inspect.isgeneratorfunction(func):
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coro = func
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else:
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@functools.wraps(func)
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def coro(*args, **kw):
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res = func(*args, **kw)
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if (base_futures.isfuture(res) or inspect.isgenerator(res) or
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isinstance(res, CoroWrapper)):
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res = yield from res
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else:
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# If 'func' returns an Awaitable (new in 3.5) we
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# want to run it.
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try:
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await_meth = res.__await__
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except AttributeError:
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pass
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else:
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if isinstance(res, Awaitable):
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res = yield from await_meth()
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return res
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if not _DEBUG:
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wrapper = types.coroutine(coro)
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else:
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@functools.wraps(func)
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def wrapper(*args, **kwds):
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w = CoroWrapper(coro(*args, **kwds), func=func)
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if w._source_traceback:
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del w._source_traceback[-1]
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# Python < 3.5 does not implement __qualname__
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# on generator objects, so we set it manually.
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# We use getattr as some callables (such as
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# functools.partial may lack __qualname__).
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w.__name__ = getattr(func, '__name__', None)
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w.__qualname__ = getattr(func, '__qualname__', None)
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return w
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wrapper._is_coroutine = _is_coroutine # For iscoroutinefunction().
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return wrapper
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# A marker for iscoroutinefunction.
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_is_coroutine = object()
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def iscoroutinefunction(func):
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"""Return True if func is a decorated coroutine function."""
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return (inspect.iscoroutinefunction(func) or
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getattr(func, '_is_coroutine', None) is _is_coroutine)
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# Prioritize native coroutine check to speed-up
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# asyncio.iscoroutine.
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_COROUTINE_TYPES = (types.CoroutineType, types.GeneratorType,
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Coroutine, CoroWrapper)
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def iscoroutine(obj):
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"""Return True if obj is a coroutine object."""
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return isinstance(obj, _COROUTINE_TYPES)
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def _format_coroutine(coro):
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assert iscoroutine(coro)
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if not hasattr(coro, 'cr_code') and not hasattr(coro, 'gi_code'):
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# Most likely a built-in type or a Cython coroutine.
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# Built-in types might not have __qualname__ or __name__.
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coro_name = getattr(
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coro, '__qualname__',
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getattr(coro, '__name__', type(coro).__name__))
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coro_name = '{}()'.format(coro_name)
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running = False
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try:
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running = coro.cr_running
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except AttributeError:
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try:
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running = coro.gi_running
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except AttributeError:
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pass
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if running:
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return '{} running'.format(coro_name)
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else:
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return coro_name
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coro_name = None
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if isinstance(coro, CoroWrapper):
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func = coro.func
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coro_name = coro.__qualname__
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if coro_name is not None:
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coro_name = '{}()'.format(coro_name)
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else:
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func = coro
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if coro_name is None:
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coro_name = events._format_callback(func, (), {})
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try:
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coro_code = coro.gi_code
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except AttributeError:
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coro_code = coro.cr_code
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try:
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coro_frame = coro.gi_frame
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except AttributeError:
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coro_frame = coro.cr_frame
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filename = coro_code.co_filename
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lineno = 0
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if (isinstance(coro, CoroWrapper) and
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not inspect.isgeneratorfunction(coro.func) and
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coro.func is not None):
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source = events._get_function_source(coro.func)
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if source is not None:
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filename, lineno = source
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if coro_frame is None:
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coro_repr = ('%s done, defined at %s:%s'
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% (coro_name, filename, lineno))
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else:
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coro_repr = ('%s running, defined at %s:%s'
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% (coro_name, filename, lineno))
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elif coro_frame is not None:
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lineno = coro_frame.f_lineno
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coro_repr = ('%s running at %s:%s'
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% (coro_name, filename, lineno))
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else:
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lineno = coro_code.co_firstlineno
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coro_repr = ('%s done, defined at %s:%s'
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% (coro_name, filename, lineno))
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return coro_repr
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