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# Copyright 2012 Red Hat, Inc.
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# Copyright 2013 IBM Corp.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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gettext for openstack-common modules.
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Usual usage in an openstack.common module:
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from oslo.middleware.openstack.common.gettextutils import _
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"""
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import copy
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import functools
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import gettext
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import locale
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from logging import handlers
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import os
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from babel import localedata
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import six
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_AVAILABLE_LANGUAGES = {}
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# FIXME(dhellmann): Remove this when moving to oslo.i18n.
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USE_LAZY = False
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class TranslatorFactory(object):
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"""Create translator functions
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"""
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def __init__(self, domain, lazy=False, localedir=None):
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"""Establish a set of translation functions for the domain.
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:param domain: Name of translation domain,
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specifying a message catalog.
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:type domain: str
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:param lazy: Delays translation until a message is emitted.
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Defaults to False.
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:type lazy: Boolean
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:param localedir: Directory with translation catalogs.
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:type localedir: str
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"""
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self.domain = domain
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self.lazy = lazy
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if localedir is None:
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localedir = os.environ.get(domain.upper() + '_LOCALEDIR')
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self.localedir = localedir
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def _make_translation_func(self, domain=None):
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"""Return a new translation function ready for use.
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Takes into account whether or not lazy translation is being
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done.
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The domain can be specified to override the default from the
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factory, but the localedir from the factory is always used
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because we assume the log-level translation catalogs are
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installed in the same directory as the main application
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catalog.
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"""
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if domain is None:
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domain = self.domain
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if self.lazy:
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return functools.partial(Message, domain=domain)
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t = gettext.translation(
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domain,
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localedir=self.localedir,
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fallback=True,
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)
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if six.PY3:
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return t.gettext
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return t.ugettext
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@property
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def primary(self):
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"The default translation function."
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return self._make_translation_func()
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def _make_log_translation_func(self, level):
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return self._make_translation_func(self.domain + '-log-' + level)
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@property
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def log_info(self):
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"Translate info-level log messages."
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return self._make_log_translation_func('info')
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@property
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def log_warning(self):
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"Translate warning-level log messages."
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return self._make_log_translation_func('warning')
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@property
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def log_error(self):
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"Translate error-level log messages."
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return self._make_log_translation_func('error')
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@property
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def log_critical(self):
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"Translate critical-level log messages."
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return self._make_log_translation_func('critical')
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# NOTE(dhellmann): When this module moves out of the incubator into
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# oslo.i18n, these global variables can be moved to an integration
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# module within each application.
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# Create the global translation functions.
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_translators = TranslatorFactory('oslo.middleware')
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# The primary translation function using the well-known name "_"
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_ = _translators.primary
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# Translators for log levels.
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#
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# The abbreviated names are meant to reflect the usual use of a short
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# name like '_'. The "L" is for "log" and the other letter comes from
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# the level.
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_LI = _translators.log_info
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_LW = _translators.log_warning
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_LE = _translators.log_error
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_LC = _translators.log_critical
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# NOTE(dhellmann): End of globals that will move to the application's
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# integration module.
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def enable_lazy():
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"""Convenience function for configuring _() to use lazy gettext
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Call this at the start of execution to enable the gettextutils._
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function to use lazy gettext functionality. This is useful if
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your project is importing _ directly instead of using the
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gettextutils.install() way of importing the _ function.
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"""
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# FIXME(dhellmann): This function will be removed in oslo.i18n,
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# because the TranslatorFactory makes it superfluous.
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global _, _LI, _LW, _LE, _LC, USE_LAZY
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tf = TranslatorFactory('oslo.middleware', lazy=True)
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_ = tf.primary
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_LI = tf.log_info
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_LW = tf.log_warning
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_LE = tf.log_error
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_LC = tf.log_critical
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USE_LAZY = True
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def install(domain, lazy=False):
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"""Install a _() function using the given translation domain.
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Given a translation domain, install a _() function using gettext's
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install() function.
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The main difference from gettext.install() is that we allow
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overriding the default localedir (e.g. /usr/share/locale) using
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a translation-domain-specific environment variable (e.g.
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NOVA_LOCALEDIR).
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:param domain: the translation domain
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:param lazy: indicates whether or not to install the lazy _() function.
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The lazy _() introduces a way to do deferred translation
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of messages by installing a _ that builds Message objects,
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instead of strings, which can then be lazily translated into
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any available locale.
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"""
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if lazy:
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from six import moves
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tf = TranslatorFactory(domain, lazy=True)
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moves.builtins.__dict__['_'] = tf.primary
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else:
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localedir = '%s_LOCALEDIR' % domain.upper()
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if six.PY3:
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gettext.install(domain,
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localedir=os.environ.get(localedir))
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else:
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gettext.install(domain,
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localedir=os.environ.get(localedir),
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unicode=True)
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class Message(six.text_type):
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"""A Message object is a unicode object that can be translated.
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Translation of Message is done explicitly using the translate() method.
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For all non-translation intents and purposes, a Message is simply unicode,
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and can be treated as such.
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"""
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def __new__(cls, msgid, msgtext=None, params=None,
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domain='oslo.middleware', *args):
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"""Create a new Message object.
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In order for translation to work gettext requires a message ID, this
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msgid will be used as the base unicode text. It is also possible
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for the msgid and the base unicode text to be different by passing
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the msgtext parameter.
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"""
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# If the base msgtext is not given, we use the default translation
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# of the msgid (which is in English) just in case the system locale is
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# not English, so that the base text will be in that locale by default.
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if not msgtext:
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msgtext = Message._translate_msgid(msgid, domain)
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# We want to initialize the parent unicode with the actual object that
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# would have been plain unicode if 'Message' was not enabled.
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msg = super(Message, cls).__new__(cls, msgtext)
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msg.msgid = msgid
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msg.domain = domain
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msg.params = params
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return msg
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def translate(self, desired_locale=None):
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"""Translate this message to the desired locale.
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:param desired_locale: The desired locale to translate the message to,
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if no locale is provided the message will be
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translated to the system's default locale.
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:returns: the translated message in unicode
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"""
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translated_message = Message._translate_msgid(self.msgid,
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self.domain,
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desired_locale)
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if self.params is None:
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# No need for more translation
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return translated_message
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# This Message object may have been formatted with one or more
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# Message objects as substitution arguments, given either as a single
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# argument, part of a tuple, or as one or more values in a dictionary.
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# When translating this Message we need to translate those Messages too
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translated_params = _translate_args(self.params, desired_locale)
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translated_message = translated_message % translated_params
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return translated_message
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@staticmethod
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def _translate_msgid(msgid, domain, desired_locale=None):
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if not desired_locale:
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system_locale = locale.getdefaultlocale()
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# If the system locale is not available to the runtime use English
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if not system_locale[0]:
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desired_locale = 'en_US'
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else:
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desired_locale = system_locale[0]
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locale_dir = os.environ.get(domain.upper() + '_LOCALEDIR')
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lang = gettext.translation(domain,
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localedir=locale_dir,
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languages=[desired_locale],
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fallback=True)
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if six.PY3:
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translator = lang.gettext
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else:
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translator = lang.ugettext
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translated_message = translator(msgid)
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return translated_message
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def __mod__(self, other):
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# When we mod a Message we want the actual operation to be performed
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# by the parent class (i.e. unicode()), the only thing we do here is
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# save the original msgid and the parameters in case of a translation
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params = self._sanitize_mod_params(other)
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unicode_mod = super(Message, self).__mod__(params)
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modded = Message(self.msgid,
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msgtext=unicode_mod,
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params=params,
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domain=self.domain)
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return modded
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def _sanitize_mod_params(self, other):
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"""Sanitize the object being modded with this Message.
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- Add support for modding 'None' so translation supports it
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- Trim the modded object, which can be a large dictionary, to only
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those keys that would actually be used in a translation
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- Snapshot the object being modded, in case the message is
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translated, it will be used as it was when the Message was created
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"""
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if other is None:
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params = (other,)
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elif isinstance(other, dict):
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# Merge the dictionaries
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# Copy each item in case one does not support deep copy.
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params = {}
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if isinstance(self.params, dict):
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for key, val in self.params.items():
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params[key] = self._copy_param(val)
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for key, val in other.items():
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params[key] = self._copy_param(val)
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else:
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params = self._copy_param(other)
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return params
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def _copy_param(self, param):
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try:
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return copy.deepcopy(param)
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except Exception:
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# Fallback to casting to unicode this will handle the
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# python code-like objects that can't be deep-copied
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return six.text_type(param)
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def __add__(self, other):
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msg = _('Message objects do not support addition.')
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raise TypeError(msg)
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def __radd__(self, other):
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return self.__add__(other)
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if six.PY2:
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def __str__(self):
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# NOTE(luisg): Logging in python 2.6 tries to str() log records,
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# and it expects specifically a UnicodeError in order to proceed.
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msg = _('Message objects do not support str() because they may '
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'contain non-ascii characters. '
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'Please use unicode() or translate() instead.')
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raise UnicodeError(msg)
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def get_available_languages(domain):
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"""Lists the available languages for the given translation domain.
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:param domain: the domain to get languages for
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"""
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if domain in _AVAILABLE_LANGUAGES:
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return copy.copy(_AVAILABLE_LANGUAGES[domain])
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localedir = '%s_LOCALEDIR' % domain.upper()
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find = lambda x: gettext.find(domain,
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localedir=os.environ.get(localedir),
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languages=[x])
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# NOTE(mrodden): en_US should always be available (and first in case
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# order matters) since our in-line message strings are en_US
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|
language_list = ['en_US']
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# NOTE(luisg): Babel <1.0 used a function called list(), which was
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# renamed to locale_identifiers() in >=1.0, the requirements master list
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# requires >=0.9.6, uncapped, so defensively work with both. We can remove
|
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# this check when the master list updates to >=1.0, and update all projects
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list_identifiers = (getattr(localedata, 'list', None) or
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|
getattr(localedata, 'locale_identifiers'))
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locale_identifiers = list_identifiers()
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for i in locale_identifiers:
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if find(i) is not None:
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language_list.append(i)
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# NOTE(luisg): Babel>=1.0,<1.3 has a bug where some OpenStack supported
|
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|
|
# locales (e.g. 'zh_CN', and 'zh_TW') aren't supported even though they
|
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|
|
# are perfectly legitimate locales:
|
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|
|
# https://github.com/mitsuhiko/babel/issues/37
|
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|
|
# In Babel 1.3 they fixed the bug and they support these locales, but
|
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|
|
# they are still not explicitly "listed" by locale_identifiers().
|
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|
|
|
# That is why we add the locales here explicitly if necessary so that
|
|
|
|
|
# they are listed as supported.
|
|
|
|
|
aliases = {'zh': 'zh_CN',
|
|
|
|
|
'zh_Hant_HK': 'zh_HK',
|
|
|
|
|
'zh_Hant': 'zh_TW',
|
|
|
|
|
'fil': 'tl_PH'}
|
|
|
|
|
for (locale_, alias) in six.iteritems(aliases):
|
|
|
|
|
if locale_ in language_list and alias not in language_list:
|
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|
|
language_list.append(alias)
|
|
|
|
|
|
|
|
|
|
_AVAILABLE_LANGUAGES[domain] = language_list
|
|
|
|
|
return copy.copy(language_list)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def translate(obj, desired_locale=None):
|
|
|
|
|
"""Gets the translated unicode representation of the given object.
|
|
|
|
|
|
|
|
|
|
If the object is not translatable it is returned as-is.
|
|
|
|
|
If the locale is None the object is translated to the system locale.
|
|
|
|
|
|
|
|
|
|
:param obj: the object to translate
|
|
|
|
|
:param desired_locale: the locale to translate the message to, if None the
|
|
|
|
|
default system locale will be used
|
|
|
|
|
:returns: the translated object in unicode, or the original object if
|
|
|
|
|
it could not be translated
|
|
|
|
|
"""
|
|
|
|
|
message = obj
|
|
|
|
|
if not isinstance(message, Message):
|
|
|
|
|
# If the object to translate is not already translatable,
|
|
|
|
|
# let's first get its unicode representation
|
|
|
|
|
message = six.text_type(obj)
|
|
|
|
|
if isinstance(message, Message):
|
|
|
|
|
# Even after unicoding() we still need to check if we are
|
|
|
|
|
# running with translatable unicode before translating
|
|
|
|
|
return message.translate(desired_locale)
|
|
|
|
|
return obj
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def _translate_args(args, desired_locale=None):
|
|
|
|
|
"""Translates all the translatable elements of the given arguments object.
|
|
|
|
|
|
|
|
|
|
This method is used for translating the translatable values in method
|
|
|
|
|
arguments which include values of tuples or dictionaries.
|
|
|
|
|
If the object is not a tuple or a dictionary the object itself is
|
|
|
|
|
translated if it is translatable.
|
|
|
|
|
|
|
|
|
|
If the locale is None the object is translated to the system locale.
|
|
|
|
|
|
|
|
|
|
:param args: the args to translate
|
|
|
|
|
:param desired_locale: the locale to translate the args to, if None the
|
|
|
|
|
default system locale will be used
|
|
|
|
|
:returns: a new args object with the translated contents of the original
|
|
|
|
|
"""
|
|
|
|
|
if isinstance(args, tuple):
|
|
|
|
|
return tuple(translate(v, desired_locale) for v in args)
|
|
|
|
|
if isinstance(args, dict):
|
|
|
|
|
translated_dict = {}
|
|
|
|
|
for (k, v) in six.iteritems(args):
|
|
|
|
|
translated_v = translate(v, desired_locale)
|
|
|
|
|
translated_dict[k] = translated_v
|
|
|
|
|
return translated_dict
|
|
|
|
|
return translate(args, desired_locale)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class TranslationHandler(handlers.MemoryHandler):
|
|
|
|
|
"""Handler that translates records before logging them.
|
|
|
|
|
|
|
|
|
|
The TranslationHandler takes a locale and a target logging.Handler object
|
|
|
|
|
to forward LogRecord objects to after translating them. This handler
|
|
|
|
|
depends on Message objects being logged, instead of regular strings.
|
|
|
|
|
|
|
|
|
|
The handler can be configured declaratively in the logging.conf as follows:
|
|
|
|
|
|
|
|
|
|
[handlers]
|
|
|
|
|
keys = translatedlog, translator
|
|
|
|
|
|
|
|
|
|
[handler_translatedlog]
|
|
|
|
|
class = handlers.WatchedFileHandler
|
|
|
|
|
args = ('/var/log/api-localized.log',)
|
|
|
|
|
formatter = context
|
|
|
|
|
|
|
|
|
|
[handler_translator]
|
|
|
|
|
class = openstack.common.log.TranslationHandler
|
|
|
|
|
target = translatedlog
|
|
|
|
|
args = ('zh_CN',)
|
|
|
|
|
|
|
|
|
|
If the specified locale is not available in the system, the handler will
|
|
|
|
|
log in the default locale.
|
|
|
|
|
"""
|
|
|
|
|
|
|
|
|
|
def __init__(self, locale=None, target=None):
|
|
|
|
|
"""Initialize a TranslationHandler
|
|
|
|
|
|
|
|
|
|
:param locale: locale to use for translating messages
|
|
|
|
|
:param target: logging.Handler object to forward
|
|
|
|
|
LogRecord objects to after translation
|
|
|
|
|
"""
|
|
|
|
|
# NOTE(luisg): In order to allow this handler to be a wrapper for
|
|
|
|
|
# other handlers, such as a FileHandler, and still be able to
|
|
|
|
|
# configure it using logging.conf, this handler has to extend
|
|
|
|
|
# MemoryHandler because only the MemoryHandlers' logging.conf
|
|
|
|
|
# parsing is implemented such that it accepts a target handler.
|
|
|
|
|
handlers.MemoryHandler.__init__(self, capacity=0, target=target)
|
|
|
|
|
self.locale = locale
|
|
|
|
|
|
|
|
|
|
def setFormatter(self, fmt):
|
|
|
|
|
self.target.setFormatter(fmt)
|
|
|
|
|
|
|
|
|
|
def emit(self, record):
|
|
|
|
|
# We save the message from the original record to restore it
|
|
|
|
|
# after translation, so other handlers are not affected by this
|
|
|
|
|
original_msg = record.msg
|
|
|
|
|
original_args = record.args
|
|
|
|
|
|
|
|
|
|
try:
|
|
|
|
|
self._translate_and_log_record(record)
|
|
|
|
|
finally:
|
|
|
|
|
record.msg = original_msg
|
|
|
|
|
record.args = original_args
|
|
|
|
|
|
|
|
|
|
def _translate_and_log_record(self, record):
|
|
|
|
|
record.msg = translate(record.msg, self.locale)
|
|
|
|
|
|
|
|
|
|
# In addition to translating the message, we also need to translate
|
|
|
|
|
# arguments that were passed to the log method that were not part
|
|
|
|
|
# of the main message e.g., log.info(_('Some message %s'), this_one))
|
|
|
|
|
record.args = _translate_args(record.args, self.locale)
|
|
|
|
|
|
|
|
|
|
self.target.emit(record)
|
gordon chung