mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
265 lines
8.4 KiB
Python
265 lines
8.4 KiB
Python
__all__ = 'coroutine', 'iscoroutinefunction', 'iscoroutine'
|
|
|
|
import collections.abc
|
|
import functools
|
|
import inspect
|
|
import os
|
|
import sys
|
|
import traceback
|
|
import types
|
|
|
|
from . import base_futures
|
|
from . import constants
|
|
from . import format_helpers
|
|
from .log import logger
|
|
|
|
|
|
def _is_debug_mode():
|
|
# If you set _DEBUG to true, @coroutine will wrap the resulting
|
|
# generator objects in a CoroWrapper instance (defined below). That
|
|
# instance will log a message when the generator is never iterated
|
|
# over, which may happen when you forget to use "await" or "yield from"
|
|
# with a coroutine call.
|
|
# Note that the value of the _DEBUG flag is taken
|
|
# when the decorator is used, so to be of any use it must be set
|
|
# before you define your coroutines. A downside of using this feature
|
|
# is that tracebacks show entries for the CoroWrapper.__next__ method
|
|
# when _DEBUG is true.
|
|
return sys.flags.dev_mode or (not sys.flags.ignore_environment and
|
|
bool(os.environ.get('PYTHONASYNCIODEBUG')))
|
|
|
|
|
|
_DEBUG = _is_debug_mode()
|
|
|
|
|
|
class CoroWrapper:
|
|
# Wrapper for coroutine object in _DEBUG mode.
|
|
|
|
def __init__(self, gen, func=None):
|
|
assert inspect.isgenerator(gen) or inspect.iscoroutine(gen), gen
|
|
self.gen = gen
|
|
self.func = func # Used to unwrap @coroutine decorator
|
|
self._source_traceback = format_helpers.extract_stack(sys._getframe(1))
|
|
self.__name__ = getattr(gen, '__name__', None)
|
|
self.__qualname__ = getattr(gen, '__qualname__', None)
|
|
|
|
def __repr__(self):
|
|
coro_repr = _format_coroutine(self)
|
|
if self._source_traceback:
|
|
frame = self._source_traceback[-1]
|
|
coro_repr += f', created at {frame[0]}:{frame[1]}'
|
|
|
|
return f'<{self.__class__.__name__} {coro_repr}>'
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def __next__(self):
|
|
return self.gen.send(None)
|
|
|
|
def send(self, value):
|
|
return self.gen.send(value)
|
|
|
|
def throw(self, type, value=None, traceback=None):
|
|
return self.gen.throw(type, value, traceback)
|
|
|
|
def close(self):
|
|
return self.gen.close()
|
|
|
|
@property
|
|
def gi_frame(self):
|
|
return self.gen.gi_frame
|
|
|
|
@property
|
|
def gi_running(self):
|
|
return self.gen.gi_running
|
|
|
|
@property
|
|
def gi_code(self):
|
|
return self.gen.gi_code
|
|
|
|
def __await__(self):
|
|
return self
|
|
|
|
@property
|
|
def gi_yieldfrom(self):
|
|
return self.gen.gi_yieldfrom
|
|
|
|
def __del__(self):
|
|
# Be careful accessing self.gen.frame -- self.gen might not exist.
|
|
gen = getattr(self, 'gen', None)
|
|
frame = getattr(gen, 'gi_frame', None)
|
|
if frame is not None and frame.f_lasti == -1:
|
|
msg = f'{self!r} was never yielded from'
|
|
tb = getattr(self, '_source_traceback', ())
|
|
if tb:
|
|
tb = ''.join(traceback.format_list(tb))
|
|
msg += (f'\nCoroutine object created at '
|
|
f'(most recent call last, truncated to '
|
|
f'{constants.DEBUG_STACK_DEPTH} last lines):\n')
|
|
msg += tb.rstrip()
|
|
logger.error(msg)
|
|
|
|
|
|
def coroutine(func):
|
|
"""Decorator to mark coroutines.
|
|
|
|
If the coroutine is not yielded from before it is destroyed,
|
|
an error message is logged.
|
|
"""
|
|
if inspect.iscoroutinefunction(func):
|
|
# In Python 3.5 that's all we need to do for coroutines
|
|
# defined with "async def".
|
|
return func
|
|
|
|
if inspect.isgeneratorfunction(func):
|
|
coro = func
|
|
else:
|
|
@functools.wraps(func)
|
|
def coro(*args, **kw):
|
|
res = func(*args, **kw)
|
|
if (base_futures.isfuture(res) or inspect.isgenerator(res) or
|
|
isinstance(res, CoroWrapper)):
|
|
res = yield from res
|
|
else:
|
|
# If 'res' is an awaitable, run it.
|
|
try:
|
|
await_meth = res.__await__
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if isinstance(res, collections.abc.Awaitable):
|
|
res = yield from await_meth()
|
|
return res
|
|
|
|
coro = types.coroutine(coro)
|
|
if not _DEBUG:
|
|
wrapper = coro
|
|
else:
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kwds):
|
|
w = CoroWrapper(coro(*args, **kwds), func=func)
|
|
if w._source_traceback:
|
|
del w._source_traceback[-1]
|
|
# Python < 3.5 does not implement __qualname__
|
|
# on generator objects, so we set it manually.
|
|
# We use getattr as some callables (such as
|
|
# functools.partial may lack __qualname__).
|
|
w.__name__ = getattr(func, '__name__', None)
|
|
w.__qualname__ = getattr(func, '__qualname__', None)
|
|
return w
|
|
|
|
wrapper._is_coroutine = _is_coroutine # For iscoroutinefunction().
|
|
return wrapper
|
|
|
|
|
|
# A marker for iscoroutinefunction.
|
|
_is_coroutine = object()
|
|
|
|
|
|
def iscoroutinefunction(func):
|
|
"""Return True if func is a decorated coroutine function."""
|
|
return (inspect.iscoroutinefunction(func) or
|
|
getattr(func, '_is_coroutine', None) is _is_coroutine)
|
|
|
|
|
|
# Prioritize native coroutine check to speed-up
|
|
# asyncio.iscoroutine.
|
|
_COROUTINE_TYPES = (types.CoroutineType, types.GeneratorType,
|
|
collections.abc.Coroutine, CoroWrapper)
|
|
_iscoroutine_typecache = set()
|
|
|
|
|
|
def iscoroutine(obj):
|
|
"""Return True if obj is a coroutine object."""
|
|
if type(obj) in _iscoroutine_typecache:
|
|
return True
|
|
|
|
if isinstance(obj, _COROUTINE_TYPES):
|
|
# Just in case we don't want to cache more than 100
|
|
# positive types. That shouldn't ever happen, unless
|
|
# someone stressing the system on purpose.
|
|
if len(_iscoroutine_typecache) < 100:
|
|
_iscoroutine_typecache.add(type(obj))
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
|
|
def _format_coroutine(coro):
|
|
assert iscoroutine(coro)
|
|
|
|
is_corowrapper = isinstance(coro, CoroWrapper)
|
|
|
|
def get_name(coro):
|
|
# Coroutines compiled with Cython sometimes don't have
|
|
# proper __qualname__ or __name__. While that is a bug
|
|
# in Cython, asyncio shouldn't crash with an AttributeError
|
|
# in its __repr__ functions.
|
|
if is_corowrapper:
|
|
return format_helpers._format_callback(coro.func, (), {})
|
|
|
|
if hasattr(coro, '__qualname__') and coro.__qualname__:
|
|
coro_name = coro.__qualname__
|
|
elif hasattr(coro, '__name__') and coro.__name__:
|
|
coro_name = coro.__name__
|
|
else:
|
|
# Stop masking Cython bugs, expose them in a friendly way.
|
|
coro_name = f'<{type(coro).__name__} without __name__>'
|
|
return f'{coro_name}()'
|
|
|
|
def is_running(coro):
|
|
try:
|
|
return coro.cr_running
|
|
except AttributeError:
|
|
try:
|
|
return coro.gi_running
|
|
except AttributeError:
|
|
return False
|
|
|
|
coro_code = None
|
|
if hasattr(coro, 'cr_code') and coro.cr_code:
|
|
coro_code = coro.cr_code
|
|
elif hasattr(coro, 'gi_code') and coro.gi_code:
|
|
coro_code = coro.gi_code
|
|
|
|
coro_name = get_name(coro)
|
|
|
|
if not coro_code:
|
|
# Built-in types might not have __qualname__ or __name__.
|
|
if is_running(coro):
|
|
return f'{coro_name} running'
|
|
else:
|
|
return coro_name
|
|
|
|
coro_frame = None
|
|
if hasattr(coro, 'gi_frame') and coro.gi_frame:
|
|
coro_frame = coro.gi_frame
|
|
elif hasattr(coro, 'cr_frame') and coro.cr_frame:
|
|
coro_frame = coro.cr_frame
|
|
|
|
# If Cython's coroutine has a fake code object without proper
|
|
# co_filename -- expose that.
|
|
filename = coro_code.co_filename or '<empty co_filename>'
|
|
|
|
lineno = 0
|
|
if (is_corowrapper and
|
|
coro.func is not None and
|
|
not inspect.isgeneratorfunction(coro.func)):
|
|
source = format_helpers._get_function_source(coro.func)
|
|
if source is not None:
|
|
filename, lineno = source
|
|
if coro_frame is None:
|
|
coro_repr = f'{coro_name} done, defined at {filename}:{lineno}'
|
|
else:
|
|
coro_repr = f'{coro_name} running, defined at {filename}:{lineno}'
|
|
|
|
elif coro_frame is not None:
|
|
lineno = coro_frame.f_lineno
|
|
coro_repr = f'{coro_name} running at {filename}:{lineno}'
|
|
|
|
else:
|
|
lineno = coro_code.co_firstlineno
|
|
coro_repr = f'{coro_name} done, defined at {filename}:{lineno}'
|
|
|
|
return coro_repr
|