openstack/oslo.messaging
Code Issues Proposed changes

Deprecates the localcontext API

Browse Source 
We deprecate the localcontext API in favor of the
oslo.context one.

Related bug: #1288878

Change-Id: If6049544e35ae49e41f2771cae858b6d4ebe00cd
This commit is contained in:
Mehdi Abaakouk 2015-01-14 09:07:22 +01:00
parent ce7d5e8bae
commit 01247563f1
7 changed files with 322 additions and 4 deletions
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3
openstack-common.conf
View File

@ -1,4 +1,7 @@
[DEFAULT]
# The list of modules to copy from oslo-incubator.git
module=versionutils
# The base module to hold the copy of openstack.common
base=oslo_messaging

16
oslo_messaging/localcontext.py
View File

@ -17,15 +17,21 @@ __all__ = [
'get_local_context',
'set_local_context',
'clear_local_context',
'_set_local_context',
'_clear_local_context',
]
import threading
import uuid
from oslo_messaging.openstack.common import versionutils
_KEY = '_%s_%s' % (__name__.replace('.', '_'), uuid.uuid4().hex)
_STORE = threading.local()
@versionutils.deprecated(as_of=versionutils.deprecated.KILO,
in_favor_of='oslo_context.context.get_current')
def get_local_context(ctxt):
"""Retrieve the RPC endpoint request context for the current thread.
@ -41,7 +47,12 @@ def get_local_context(ctxt):
return getattr(_STORE, _KEY, None)
@versionutils.deprecated(as_of=versionutils.deprecated.KILO)
def set_local_context(ctxt):
_set_local_context(ctxt)
def _set_local_context(ctxt):
"""Set the request context for the current thread.
:param ctxt: a deserialized request context
@ -50,6 +61,11 @@ def set_local_context(ctxt):
setattr(_STORE, _KEY, ctxt)
@versionutils.deprecated(as_of=versionutils.deprecated.KILO)
def clear_local_context():
_clear_local_context()
def _clear_local_context():
"""Clear the request context for the current thread."""
delattr(_STORE, _KEY)

4
oslo_messaging/notify/dispatcher.py
View File

@ -124,7 +124,7 @@ class NotificationDispatcher(object):
if screen and not screen.match(ctxt, publisher_id, event_type,
metadata, payload):
continue
localcontext.set_local_context(ctxt)
localcontext._set_local_context(ctxt)
try:
if executor_callback:
ret = executor_callback(callback, ctxt, publisher_id,
@ -136,5 +136,5 @@ class NotificationDispatcher(object):
if self.allow_requeue and ret == NotificationResult.REQUEUE:
return ret
finally:
localcontext.clear_local_context()
localcontext._clear_local_context()
return NotificationResult.HANDLED

45
oslo_messaging/openstack/common/_i18n.py Normal file
View File

@ -0,0 +1,45 @@
# 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.
"""oslo.i18n integration module.
See http://docs.openstack.org/developer/oslo.i18n/usage.html
"""
try:
import oslo_i18n
# NOTE(dhellmann): This reference to o-s-l-o will be replaced by the
# application name when this module is synced into the separate
# repository. It is OK to have more than one translation function
# using the same domain, since there will still only be one message
# catalog.
_translators = oslo_i18n.TranslatorFactory(domain='oslo_messaging')
# The primary translation function using the well-known name "_"
_ = _translators.primary
# Translators for log levels.
#
# The abbreviated names are meant to reflect the usual use of a short
# name like '_'. The "L" is for "log" and the other letter comes from
# the level.
_LI = _translators.log_info
_LW = _translators.log_warning
_LE = _translators.log_error
_LC = _translators.log_critical
except ImportError:
# NOTE(dims): Support for cases where a project wants to use
# code from oslo-incubator, but is not ready to be internationalized
# (like tempest)
_ = _LI = _LW = _LE = _LC = lambda x: x

253
oslo_messaging/openstack/common/versionutils.py Normal file
View File

@ -0,0 +1,253 @@
# Copyright (c) 2013 OpenStack Foundation
# All Rights Reserved.
#
# 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.
"""
Helpers for comparing version strings.
"""
import functools
import inspect
import logging
from oslo_config import cfg
import pkg_resources
import six
from oslo_messaging.openstack.common._i18n import _
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
opts = [
cfg.BoolOpt('fatal_deprecations',
default=False,
help='Enables or disables fatal status of deprecations.'),
]
class deprecated(object):
"""A decorator to mark callables as deprecated.
This decorator logs a deprecation message when the callable it decorates is
used. The message will include the release where the callable was
deprecated, the release where it may be removed and possibly an optional
replacement.
Examples:
1. Specifying the required deprecated release
>>> @deprecated(as_of=deprecated.ICEHOUSE)
... def a(): pass
2. Specifying a replacement:
>>> @deprecated(as_of=deprecated.ICEHOUSE, in_favor_of='f()')
... def b(): pass
3. Specifying the release where the functionality may be removed:
>>> @deprecated(as_of=deprecated.ICEHOUSE, remove_in=+1)
... def c(): pass
4. Specifying the deprecated functionality will not be removed:
>>> @deprecated(as_of=deprecated.ICEHOUSE, remove_in=0)
... def d(): pass
5. Specifying a replacement, deprecated functionality will not be removed:
>>> @deprecated(as_of=deprecated.ICEHOUSE, in_favor_of='f()', remove_in=0)
... def e(): pass
"""
# NOTE(morganfainberg): Bexar is used for unit test purposes, it is
# expected we maintain a gap between Bexar and Folsom in this list.
BEXAR = 'B'
FOLSOM = 'F'
GRIZZLY = 'G'
HAVANA = 'H'
ICEHOUSE = 'I'
JUNO = 'J'
KILO = 'K'
_RELEASES = {
# NOTE(morganfainberg): Bexar is used for unit test purposes, it is
# expected we maintain a gap between Bexar and Folsom in this list.
'B': 'Bexar',
'F': 'Folsom',
'G': 'Grizzly',
'H': 'Havana',
'I': 'Icehouse',
'J': 'Juno',
'K': 'Kilo',
}
_deprecated_msg_with_alternative = _(
'%(what)s is deprecated as of %(as_of)s in favor of '
'%(in_favor_of)s and may be removed in %(remove_in)s.')
_deprecated_msg_no_alternative = _(
'%(what)s is deprecated as of %(as_of)s and may be '
'removed in %(remove_in)s. It will not be superseded.')
_deprecated_msg_with_alternative_no_removal = _(
'%(what)s is deprecated as of %(as_of)s in favor of %(in_favor_of)s.')
_deprecated_msg_with_no_alternative_no_removal = _(
'%(what)s is deprecated as of %(as_of)s. It will not be superseded.')
def __init__(self, as_of, in_favor_of=None, remove_in=2, what=None):
"""Initialize decorator
:param as_of: the release deprecating the callable. Constants
are define in this class for convenience.
:param in_favor_of: the replacement for the callable (optional)
:param remove_in: an integer specifying how many releases to wait
before removing (default: 2)
:param what: name of the thing being deprecated (default: the
callable's name)
"""
self.as_of = as_of
self.in_favor_of = in_favor_of
self.remove_in = remove_in
self.what = what
def __call__(self, func_or_cls):
if not self.what:
self.what = func_or_cls.__name__ + '()'
msg, details = self._build_message()
if inspect.isfunction(func_or_cls):
@six.wraps(func_or_cls)
def wrapped(*args, **kwargs):
report_deprecated_feature(LOG, msg, details)
return func_or_cls(*args, **kwargs)
return wrapped
elif inspect.isclass(func_or_cls):
orig_init = func_or_cls.__init__
# TODO(tsufiev): change `functools` module to `six` as
# soon as six 1.7.4 (with fix for passing `assigned`
# argument to underlying `functools.wraps`) is released
# and added to the oslo-incubator requrements
@functools.wraps(orig_init, assigned=('__name__', '__doc__'))
def new_init(self, *args, **kwargs):
report_deprecated_feature(LOG, msg, details)
orig_init(self, *args, **kwargs)
func_or_cls.__init__ = new_init
return func_or_cls
else:
raise TypeError('deprecated can be used only with functions or '
'classes')
def _get_safe_to_remove_release(self, release):
# TODO(dstanek): this method will have to be reimplemented once
# when we get to the X release because once we get to the Y
# release, what is Y+2?
new_release = chr(ord(release) + self.remove_in)
if new_release in self._RELEASES:
return self._RELEASES[new_release]
else:
return new_release
def _build_message(self):
details = dict(what=self.what,
as_of=self._RELEASES[self.as_of],
remove_in=self._get_safe_to_remove_release(self.as_of))
if self.in_favor_of:
details['in_favor_of'] = self.in_favor_of
if self.remove_in > 0:
msg = self._deprecated_msg_with_alternative
else:
# There are no plans to remove this function, but it is
# now deprecated.
msg = self._deprecated_msg_with_alternative_no_removal
else:
if self.remove_in > 0:
msg = self._deprecated_msg_no_alternative
else:
# There are no plans to remove this function, but it is
# now deprecated.
msg = self._deprecated_msg_with_no_alternative_no_removal
return msg, details
def is_compatible(requested_version, current_version, same_major=True):
"""Determine whether `requested_version` is satisfied by
`current_version`; in other words, `current_version` is >=
`requested_version`.
:param requested_version: version to check for compatibility
:param current_version: version to check against
:param same_major: if True, the major version must be identical between
`requested_version` and `current_version`. This is used when a
major-version difference indicates incompatibility between the two
versions. Since this is the common-case in practice, the default is
True.
:returns: True if compatible, False if not
"""
requested_parts = pkg_resources.parse_version(requested_version)
current_parts = pkg_resources.parse_version(current_version)
if same_major and (requested_parts[0] != current_parts[0]):
return False
return current_parts >= requested_parts
# Track the messages we have sent already. See
# report_deprecated_feature().
_deprecated_messages_sent = {}
def report_deprecated_feature(logger, msg, *args, **kwargs):
"""Call this function when a deprecated feature is used.
If the system is configured for fatal deprecations then the message
is logged at the 'critical' level and :class:`DeprecatedConfig` will
be raised.
Otherwise, the message will be logged (once) at the 'warn' level.
:raises: :class:`DeprecatedConfig` if the system is configured for
fatal deprecations.
"""
stdmsg = _("Deprecated: %s") % msg
CONF.register_opts(opts)
if CONF.fatal_deprecations:
logger.critical(stdmsg, *args, **kwargs)
raise DeprecatedConfig(msg=stdmsg)
# Using a list because a tuple with dict can't be stored in a set.
sent_args = _deprecated_messages_sent.setdefault(msg, list())
if args in sent_args:
# Already logged this message, so don't log it again.
return
sent_args.append(args)
logger.warn(stdmsg, *args, **kwargs)
class DeprecatedConfig(Exception):
message = _("Fatal call to deprecated config: %(msg)s")
def __init__(self, msg):
super(Exception, self).__init__(self.message % dict(msg=msg))

4
oslo_messaging/rpc/dispatcher.py
View File

@ -180,12 +180,12 @@ class RPCDispatcher(object):
continue
if hasattr(endpoint, method):
localcontext.set_local_context(ctxt)
localcontext._set_local_context(ctxt)
try:
return self._do_dispatch(endpoint, method, ctxt, args,
executor_callback)
finally:
localcontext.clear_local_context()
localcontext._clear_local_context()
found_compatible = True

1
tox.ini
View File

@ -59,5 +59,6 @@ exclude = .tox,dist,doc,*.egg,build,__init__.py
[hacking]
import_exceptions =
oslo_messaging.openstack.common._i18n
oslo_messaging._i18n
six.moves