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Edit File : coroutines.py \| Size : 8.59 KB
__all__ = 'coroutine', 'iscoroutinefunction', 'iscoroutine' import collections.abc import functools import inspect import os import sys import traceback import types import warnings 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. """ warnings.warn('"@coroutine" decorator is deprecated since Python 3.8, use "async def" instead', DeprecationWarning, stacklevel=2) 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 Back

Edit File : coroutines.py | Size : 8.59 KB

__all__ = 'coroutine', 'iscoroutinefunction', 'iscoroutine'

import collections.abc
import functools
import inspect
import os
import sys
import traceback
import types
import warnings

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.
    """
    warnings.warn('"@coroutine" decorator is deprecated since Python 3.8, use "async def" instead',
                  DeprecationWarning,
                  stacklevel=2)
    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

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