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import functools
import inspect
import reprlib
import sys
import traceback
from . import constants
def _get_function_source(func):
func = inspect.unwrap(func)
if inspect.isfunction(func):
code = func.__code__
return (code.co_filename, code.co_firstlineno)
if isinstance(func, functools.partial):
return _get_function_source(func.func)
if isinstance(func, functools.partialmethod):
return _get_function_source(func.func)
return None
def _format_callback_source(func, args):
func_repr = _format_callback(func, args, None)
source = _get_function_source(func)
if source:
func_repr += f' at {source[0]}:{source[1]}'
return func_repr
def _format_args_and_kwargs(args, kwargs):
"""Format function arguments and keyword arguments.
Special case for a single parameter: ('hello',) is formatted as ('hello').
"""
# use reprlib to limit the length of the output
items = []
if args:
items.extend(reprlib.repr(arg) for arg in args)
if kwargs:
items.extend(f'{k}={reprlib.repr(v)}' for k, v in kwargs.items())
return '({})'.format(', '.join(items))
def _format_callback(func, args, kwargs, suffix=''):
if isinstance(func, functools.partial):
suffix = _format_args_and_kwargs(args, kwargs) + suffix
return _format_callback(func.func, func.args, func.keywords, suffix)
if hasattr(func, '__qualname__') and func.__qualname__:
func_repr = func.__qualname__
elif hasattr(func, '__name__') and func.__name__:
func_repr = func.__name__
else:
func_repr = repr(func)
func_repr += _format_args_and_kwargs(args, kwargs)
if suffix:
func_repr += suffix
return func_repr
def extract_stack(f=None, limit=None):
"""Replacement for traceback.extract_stack() that only does the
necessary work for asyncio debug mode.
"""
if f is None:
f = sys._getframe().f_back
if limit is None:
# Limit the amount of work to a reasonable amount, as extract_stack()
# can be called for each coroutine and future in debug mode.
limit = constants.DEBUG_STACK_DEPTH
stack = traceback.StackSummary.extract(traceback.walk_stack(f),
limit=limit,
lookup_lines=False)
stack.reverse()
return stack