The zaqar.openstack.common.gettextutils module

gettext for openstack-common modules.

Usual usage in an openstack.common module:

from zaqar.openstack.common.gettextutils import _

class Message

Bases: unicode

A Message object is a unicode object that can be translated.

Translation of Message is done explicitly using the translate() method. For all non-translation intents and purposes, a Message is simply unicode, and can be treated as such.

translate(desired_locale=None)

Translate this message to the desired locale.

Parameters:desired_locale – The desired locale to translate the message to, if no locale is provided the message will be translated to the system’s default locale. Returns:the translated message in unicode

class TranslationHandler(locale=None, target=None)

Bases: logging.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.

emit(record)

setFormatter(fmt)

class TranslatorFactory(domain, localedir=None)

Bases: object

Create translator functions

log_critical

Translate critical-level log messages.

log_error

Translate error-level log messages.

log_info

Translate info-level log messages.

log_warning

Translate warning-level log messages.

primary

The default translation function.

enable_lazy()

Convenience function for configuring _() to use lazy gettext

Call this at the start of execution to enable the gettextutils._ function to use lazy gettext functionality. This is useful if your project is importing _ directly instead of using the gettextutils.install() way of importing the _ function.

get_available_languages(domain)

Lists the available languages for the given translation domain.

Parameters:domain – the domain to get languages for

install(domain)

Install a _() function using the given translation domain.

Given a translation domain, install a _() function using gettext’s install() function.

The main difference from gettext.install() is that we allow overriding the default localedir (e.g. /usr/share/locale) using a translation-domain-specific environment variable (e.g. NOVA_LOCALEDIR).

Note that to enable lazy translation, enable_lazy must be called.

Parameters:domain – the translation domain

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.

Parameters:

• obj – the object to translate
• 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