Retrieve loglevel of current node using rospy

Question

Sometimes generating certain debug information may be computationally burdensome and therefore it may be desirable to make this dependent on the current log level.

Thus I was wondering, what would be the correct way to retrieve the loglevel from within a node using rospy (in Kinetic)? Ultimately, I would want to be able to do something like this:

if current_log_level == rospy.DEBUG:
  result = burdensome_stats_generation()
  rospy.logdebug("Very informative output: %s", res)

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Originally posted by igor on ROS Answers with karma: 13 on 2018-04-24

Post score: 1

Answer 1

This uses the python logging (https://docs.python.org/2.4/lib/module-logging.html) underneath rospy logging:

#!/usr/bin/env python

import rospy
import logging

rospy.init_node('log_test')

logger = logging.getLogger("rosout")

logger.setLevel(logging.INFO)
level = logger.getEffectiveLevel()
rospy.loginfo("info test, level = " + str(level))
rospy.logdebug("debug test, level = level " + str(level))

logger.setLevel(logging.DEBUG)
level = logger.getEffectiveLevel()
rospy.loginfo("info test, level = " + str(level))
rospy.logdebug("debug test, level = level " + str(level))

Old suggestions, maybe I'll test them out:

rospy service call to get_loggers service. (Maybe some extra things to do to properly call service from same node that is providing it)

I don't think there is anything in python like a C macro that could avoid evaluating a function parameter if debug wasn't on (does the actual C++ debug do anything like that?), it would be nice if this could be done:

rospy.logdebug("Very informative output: %s",  burdensome_stats_generation())

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Originally posted by lucasw with karma: 8729 on 2018-04-24

This answer was ACCEPTED on the original site

Post score: 2