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import warnings
from functools import wraps
from twisted.internet import defer, threads
from scrapy.exceptions import ScrapyDeprecationWarning
def deprecated(use_instead=None):
"""This is a decorator which can be used to mark functions
as deprecated. It will result in a warning being emitted
when the function is used."""
def deco(func):
@wraps(func)
def wrapped(*args, **kwargs):
message = "Call to deprecated function %s." % func.__name__
if use_instead:
message += " Use %s instead." % use_instead
warnings.warn(message, category=ScrapyDeprecationWarning, stacklevel=2)
return func(*args, **kwargs)
return wrapped
if callable(use_instead):
deco = deco(use_instead)
use_instead = None
return deco
def defers(func):
"""Decorator to make sure a function always returns a deferred"""
@wraps(func)
def wrapped(*a, **kw):
return defer.maybeDeferred(func, *a, **kw)
return wrapped
def inthread(func):
"""Decorator to call a function in a thread and return a deferred with the
result
"""
@wraps(func)
def wrapped(*a, **kw):
return threads.deferToThread(func, *a, **kw)
return wrapped
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