def define_logging_options(options=None):
"""Add logging-related flags to ``options``.
These options are present automatically on the default options instance;
this method is only necessary if you have created your own `.OptionParser`.
.. versionadded:: 4.2
This function existed in prior versions but was broken and undocumented until 4.2.
"""
if options is None:
# late import to prevent cycle
from tornado.options import options
options.define("logging", default="info",
help=("Set the Python log level. If 'none', tornado won't touch the "
"logging configuration."),
metavar="debug|info|warning|error|none")
options.define("log_to_stderr", type=bool, default=None,
help=("Send log output to stderr (colorized if possible). "
"By default use stderr if --log_file_prefix is not set and "
"no other logging is configured."))
options.define("log_file_prefix", type=str, default=None, metavar="PATH",
help=("Path prefix for log files. "
"Note that if you are running multiple tornado processes, "
"log_file_prefix must be different for each of them (e.g. "
"include the port number)"))
options.define("log_file_max_size", type=int, default=100 * 1000 * 1000,
help="max size of log files before rollover")
options.define("log_file_num_backups", type=int, default=10,
help="number of log files to keep")
options.define("log_rotate_when", type=str, default='midnight',
help=("specify the type of TimedRotatingFileHandler interval "
"other options:('S', 'M', 'H', 'D', 'W0'-'W6')"))
options.define("log_rotate_interval", type=int, default=1,
help="The interval value of timed rotating")
options.define("log_rotate_mode", type=str, default='size',
help="The mode of rotating files(time or size)")
options.add_parse_callback(lambda: enable_pretty_logging(options))
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