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Nodes defined in launch file have the INFO log level as a default value I would like to know how to change it so that it also logs DEBUG level strings or other types of logging.
launch_ros.actions.Node(package='demo_nodes_cpp', node_executable='talker', output='screen', parameters=[config_file])
Thank you
Hello, I have had the same issue and for me (on Eloquent) the following works:
logger = launch.substitutions.LaunchConfiguration("log_level")
launch.LaunchDescription([
launch.actions.DeclareLaunchArgument(
"log_level",
default_value=["debug"],
description="Logging level",
),
launch_ros.actions.Node(
package='demo_nodes_cpp',
executable='talker',
output='screen',
arguments=['--ros-args', '--log-level', logger]
)
])
I got this idea from this open issue: https://github.com/ros2/launch/issues... and hopefully a more elegant solution will be available soon.
If anyone has an idea for a better solution in the meantime, please share!
@tnajjar That is true. I found a solution by using the PythonExpression substitution.
node_test = LifecycleNode(
package="node_test",
executable="note_test",
name="note_test",
namespace="",
output="screen",
ros_arguments=[
"--log-level",
PythonExpression(['"node_test:=" + "', log_level, '"']),
],
)
But this is a very sinful piece of code because it allows a maleficent user to execute arbitrary Python code. Do you know any better solution?
@tnajjar That works if I want to keep the log level at "debug", but what if I want to change the log level as a command line argument?
If I write:
log_level_arg = DeclareLaunchArgument(
"log-level",
default_value=["debug"],
description="Logging level",
)
log_level = LaunchConfiguration("log-level")
...
some_node = LifecycleNode(
arguments= [
"--ros-args",
"--log-level",
"some_node:=",
log_level
]
then a white space is added between "some_node:=" and log_level and everything breaks down.
I know this question was asked before dashing was released, and that eloquent is being released soon with changed syntax...
But for dashing, you can use the following syntax:
launch_ros.actions.Node(package='demo_nodes_cpp',
node_executable='talker',
output='screen',
parameters=[config_file],
arguments=[('__log_level:=debug')])
This will set the log level to debug for every node being run in this process (rcl, rclcpp, the rmw layer). I don't know how to restrict the log changes to just "talker" node unfortunately. I think logging is still a work in progress.
Can anyone update on how to do this in Eloquent/Foxy? The direct translation to the new command line format does not work:
launch_ros.actions.Node(
package='demo_nodes_cpp',
executable='talker',
output='screen',
arguments=[('--ros-args --log-level debug')]
)
The arguments must be given in a list of strings in Foxy as shown below.
launch_ros.actions.Node(
package='demo_nodes_cpp',
executable='talker',
output='screen',
arguments=['--ros-args', '--log-level', 'debug']
)
The accepted answer achieves the same result as the above code.
Asked: 2018-12-25 14:30:43 -0600
Seen: 18,441 times
Last updated: Sep 10 '20
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Any updates?