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# Copyright 2014-2015 Canonical Limited.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Bootstrap charm-helpers, installing its dependencies if necessary using
# only standard libraries.
from __future__ import print_function
from __future__ import absolute_import
import functools
import inspect
import subprocess
import sys
try:
import six # flake8: noqa
except ImportError:
if sys.version_info.major == 2:
subprocess.check_call(['apt-get', 'install', '-y', 'python-six'])
else:
subprocess.check_call(['apt-get', 'install', '-y', 'python3-six'])
import six # flake8: noqa
try:
import yaml # flake8: noqa
except ImportError:
if sys.version_info.major == 2:
subprocess.check_call(['apt-get', 'install', '-y', 'python-yaml'])
else:
subprocess.check_call(['apt-get', 'install', '-y', 'python3-yaml'])
import yaml # flake8: noqa
# Holds a list of mapping of mangled function names that have been deprecated
# using the @deprecate decorator below. This is so that the warning is only
# printed once for each usage of the function.
__deprecated_functions = {}
def deprecate(warning, date=None, log=None):
"""Add a deprecation warning the first time the function is used.
The date, which is a string in semi-ISO8660 format indicate the year-month
that the function is officially going to be removed.
usage:
@deprecate('use core/fetch/add_source() instead', '2017-04')
def contributed_add_source_thing(...):
...
And it then prints to the log ONCE that the function is deprecated.
The reason for passing the logging function (log) is so that hookenv.log
can be used for a charm if needed.
:param warning: String to indicat where it has moved ot.
:param date: optional sting, in YYYY-MM format to indicate when the
function will definitely (probably) be removed.
:param log: The log function to call to log. If not, logs to stdout
"""
def wrap(f):
@functools.wraps(f)
def wrapped_f(*args, **kwargs):
try:
module = inspect.getmodule(f)
file = inspect.getsourcefile(f)
lines = inspect.getsourcelines(f)
f_name = "{}-{}-{}..{}-{}".format(
module.__name__, file, lines[0], lines[-1], f.__name__)
except (IOError, TypeError):
# assume it was local, so just use the name of the function
f_name = f.__name__
if f_name not in __deprecated_functions:
__deprecated_functions[f_name] = True
s = "DEPRECATION WARNING: Function {} is being removed".format(
f.__name__)
if date:
s = "{} on/around {}".format(s, date)
if warning:
s = "{} : {}".format(s, warning)
if log:
log(s)
else:
print(s)
return f(*args, **kwargs)
return wrapped_f
return wrap
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