# coding: utf-8
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"""Bunch of useful decorators"""
from __future__ import absolute_import, print_function, division
__authors__ = ["Jerome Kieffer", "H. Payno", "P. Knobel"]
__license__ = "MIT"
__date__ = "26/02/2018"
import sys
import logging
import functools
import traceback
depreclog = logging.getLogger("silx.DEPRECATION")
deprecache = set([])
[docs]def deprecated(func=None, reason=None, replacement=None, since_version=None, only_once=True, skip_backtrace_count=1):
"""
Decorator that deprecates the use of a function
:param str reason: Reason for deprecating this function
(e.g. "feature no longer provided",
:param str replacement: Name of replacement function (if the reason for
deprecating was to rename the function)
:param str since_version: First *silx* version for which the function was
deprecated (e.g. "0.5.0").
:param bool only_once: If true, the deprecation warning will only be
generated one time. Default is true.
:param int skip_backtrace_count: Amount of last backtrace to ignore when
logging the backtrace
"""
def decorator(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
name = func.func_name if sys.version_info[0] < 3 else func.__name__
deprecated_warning(type_='Function',
name=name,
reason=reason,
replacement=replacement,
since_version=since_version,
only_once=only_once,
skip_backtrace_count=skip_backtrace_count)
return func(*args, **kwargs)
return wrapper
if func is not None:
return decorator(func)
return decorator
def deprecated_warning(type_, name, reason=None, replacement=None,
since_version=None, only_once=True,
skip_backtrace_count=0):
"""
Function to log a deprecation warning
:param str type_: Nature of the object to be deprecated:
"Module", "Function", "Class" ...
:param name: Object name.
:param str reason: Reason for deprecating this function
(e.g. "feature no longer provided",
:param str replacement: Name of replacement function (if the reason for
deprecating was to rename the function)
:param str since_version: First *silx* version for which the function was
deprecated (e.g. "0.5.0").
:param bool only_once: If true, the deprecation warning will only be
generated one time for each different call locations. Default is true.
:param int skip_backtrace_count: Amount of last backtrace to ignore when
logging the backtrace
"""
if not depreclog.isEnabledFor(logging.WARNING):
# Avoid computation when it is not logged
return
msg = "%s %s is deprecated"
if since_version is not None:
msg += " since silx version %s" % since_version
msg += "."
if reason is not None:
msg += " Reason: %s." % reason
if replacement is not None:
msg += " Use '%s' instead." % replacement
msg += "\n%s"
limit = 2 + skip_backtrace_count
backtrace = "".join(traceback.format_stack(limit=limit)[0])
backtrace = backtrace.rstrip()
if only_once:
data = (msg, type_, name, backtrace)
if data in deprecache:
return
else:
deprecache.add(data)
depreclog.warning(msg, type_, name, backtrace)
