log.py 文件源码

def format(self, record):
        """Uses contextstring if request_id is set, otherwise default."""

        # NOTE(jecarey): If msg is not unicode, coerce it into unicode
        #                before it can get to the python logging and
        #                possibly cause string encoding trouble
        if not isinstance(record.msg, six.text_type):
            record.msg = six.text_type(record.msg)

        # store project info
        record.project = self.project
        record.version = self.version

        # store request info
        context = getattr(local.store, 'context', None)
        if context:
            d = _dictify_context(context)
            for k, v in d.items():
                setattr(record, k, v)

        # NOTE(sdague): default the fancier formatting params
        # to an empty string so we don't throw an exception if
        # they get used
        for key in ('instance', 'color', 'user_identity'):
            if key not in record.__dict__:
                record.__dict__[key] = ''

        if record.__dict__.get('request_id'):
            fmt = CONF.logging_context_format_string
        else:
            fmt = CONF.logging_default_format_string

        if (record.levelno == logging.DEBUG and
                CONF.logging_debug_format_suffix):
            fmt += " " + CONF.logging_debug_format_suffix

        if sys.version_info < (3, 2):
            self._fmt = fmt
        else:
            self._style = logging.PercentStyle(fmt)
            self._fmt = self._style._fmt
        # Cache this on the record, Logger will respect our formatted copy
        if record.exc_info:
            record.exc_text = self.formatException(record.exc_info, record)
        return logging.Formatter.format(self, record)