98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
# 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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"""logging utilities for translation
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"""
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from logging import handlers
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from oslo_i18n import _translate
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class TranslationHandler(handlers.MemoryHandler):
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"""Handler that translates records before logging them.
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When lazy translation is enabled in the application (see
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:func:`~oslo_i18n.enable_lazy`), the :class:`TranslationHandler`
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uses its locale configuration setting to determine how to
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translate LogRecord objects before forwarding them to the
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logging.Handler.
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When lazy translation is disabled, the message in the LogRecord is
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converted to unicode without any changes and then forwarded to the
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logging.Handler.
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The handler can be configured declaratively in the
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``logging.conf`` as follows::
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[handlers]
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keys = translatedlog, translator
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[handler_translatedlog]
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class = handlers.WatchedFileHandler
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args = ('/var/log/api-localized.log',)
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formatter = context
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[handler_translator]
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class = oslo_i18n.log.TranslationHandler
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target = translatedlog
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args = ('zh_CN',)
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If the specified locale is not available in the system, the handler will
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log in the default locale.
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"""
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def __init__(self, locale=None, target=None):
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"""Initialize a TranslationHandler
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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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# NOTE(luisg): In order to allow this handler to be a wrapper for
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# other handlers, such as a FileHandler, and still be able to
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# configure it using logging.conf, this handler has to extend
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# MemoryHandler because only the MemoryHandlers' logging.conf
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# parsing is implemented such that it accepts a target handler.
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handlers.MemoryHandler.__init__(self, capacity=0, target=target)
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self.locale = locale
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def setFormatter(self, fmt):
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self.target.setFormatter(fmt)
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def emit(self, record):
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# We save the message from the original record to restore it
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# after translation, so other handlers are not affected by this
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original_msg = record.msg
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original_args = record.args
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try:
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self._translate_and_log_record(record)
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finally:
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record.msg = original_msg
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record.args = original_args
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def _translate_and_log_record(self, record):
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record.msg = _translate.translate(record.msg, self.locale)
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# In addition to translating the message, we also need to translate
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# arguments that were passed to the log method that were not part
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# of the main message e.g., log.info(_('Some message %s'), this_one))
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record.args = _translate.translate_args(record.args, self.locale)
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self.target.emit(record)
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