Merge "Sync gettextutils from oslo"
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commit
6e95e1ab3e
@ -2,6 +2,7 @@
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# Copyright 2012 Red Hat, Inc.
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# All Rights Reserved.
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# Copyright 2013 IBM Corp.
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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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@ -23,8 +24,11 @@ Usual usage in an openstack.common module:
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from cinder.openstack.common.gettextutils import _
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"""
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import copy
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import gettext
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import logging.handlers
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import os
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import UserString
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_localedir = os.environ.get('cinder'.upper() + '_LOCALEDIR')
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_t = gettext.translation('cinder', localedir=_localedir, fallback=True)
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@ -48,3 +52,175 @@ def install(domain):
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gettext.install(domain,
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localedir=os.environ.get(domain.upper() + '_LOCALEDIR'),
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unicode=True)
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"""
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Lazy gettext functionality.
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The following is an attempt to introduce a deferred way
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to do translations on messages in OpenStack. We attempt to
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override the standard _() function and % (format string) operation
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to build Message objects that can later be translated when we have
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more information. Also included is an example LogHandler that
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translates Messages to an associated locale, effectively allowing
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many logs, each with their own locale.
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"""
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def get_lazy_gettext(domain):
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"""Assemble and return a lazy gettext function for a given domain.
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Factory method for a project/module to get a lazy gettext function
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for its own translation domain (i.e. nova, glance, cinder, etc.)
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"""
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def _lazy_gettext(msg):
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"""Create and return a Message object.
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Message encapsulates a string so that we can translate it later when
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needed.
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"""
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return Message(msg, domain)
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return _lazy_gettext
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class Message(UserString.UserString, object):
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"""Class used to encapsulate translatable messages."""
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def __init__(self, msg, domain):
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# _msg is the gettext msgid and should never change
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self._msg = msg
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self._left_extra_msg = ''
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self._right_extra_msg = ''
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self.params = None
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self.locale = None
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self.domain = domain
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@property
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def data(self):
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# NOTE(mrodden): this should always resolve to a unicode string
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# that best represents the state of the message currently
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localedir = os.environ.get(self.domain.upper() + '_LOCALEDIR')
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if self.locale:
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lang = gettext.translation(self.domain,
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localedir=localedir,
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languages=[self.locale],
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fallback=True)
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else:
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# use system locale for translations
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lang = gettext.translation(self.domain,
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localedir=localedir,
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fallback=True)
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full_msg = (self._left_extra_msg +
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lang.ugettext(self._msg) +
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self._right_extra_msg)
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if self.params is not None:
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full_msg = full_msg % self.params
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return unicode(full_msg)
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def _save_parameters(self, other):
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# we check for None later to see if
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# we actually have parameters to inject,
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# so encapsulate if our parameter is actually None
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if other is None:
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self.params = (other, )
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else:
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self.params = copy.deepcopy(other)
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return self
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# overrides to be more string-like
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def __unicode__(self):
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return self.data
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def __str__(self):
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return self.data.encode('utf-8')
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def __getstate__(self):
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to_copy = ['_msg', '_right_extra_msg', '_left_extra_msg',
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'domain', 'params', 'locale']
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new_dict = self.__dict__.fromkeys(to_copy)
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for attr in to_copy:
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new_dict[attr] = copy.deepcopy(self.__dict__[attr])
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return new_dict
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def __setstate__(self, state):
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for (k, v) in state.items():
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setattr(self, k, v)
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# operator overloads
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def __add__(self, other):
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copied = copy.deepcopy(self)
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copied._right_extra_msg += other.__str__()
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return copied
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def __radd__(self, other):
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copied = copy.deepcopy(self)
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copied._left_extra_msg += other.__str__()
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return copied
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def __mod__(self, other):
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# do a format string to catch and raise
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# any possible KeyErrors from missing parameters
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self.data % other
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copied = copy.deepcopy(self)
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return copied._save_parameters(other)
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def __mul__(self, other):
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return self.data * other
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def __rmul__(self, other):
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return other * self.data
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def __getitem__(self, key):
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return self.data[key]
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def __getslice__(self, start, end):
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return self.data.__getslice__(start, end)
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def __getattribute__(self, name):
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# NOTE(mrodden): handle lossy operations that we can't deal with yet
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# These override the UserString implementation, since UserString
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# uses our __class__ attribute to try and build a new message
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# after running the inner data string through the operation.
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# At that point, we have lost the gettext message id and can just
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# safely resolve to a string instead.
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ops = ['capitalize', 'center', 'decode', 'encode',
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'expandtabs', 'ljust', 'lstrip', 'replace', 'rjust', 'rstrip',
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'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']
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if name in ops:
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return getattr(self.data, name)
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else:
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return UserString.UserString.__getattribute__(self, name)
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class LocaleHandler(logging.Handler):
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"""Handler that can have a locale associated to translate Messages.
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A quick example of how to utilize the Message class above.
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LocaleHandler takes a locale and a target logging.Handler object
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to forward LogRecord objects to after translating the internal Message.
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"""
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def __init__(self, locale, target):
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"""Initialize a LocaleHandler
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:param locale: locale to use for translating messages
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:param target: logging.Handler object to forward
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LogRecord objects to after translation
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"""
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logging.Handler.__init__(self)
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self.locale = locale
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self.target = target
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def emit(self, record):
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if isinstance(record.msg, Message):
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# set the locale and resolve to a string
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record.msg.locale = self.locale
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self.target.emit(record)
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