motion_computation_launch.py

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# Copyright 2022-2023 Leidos
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
from ament_index_python import get_package_share_directory
from launch import LaunchDescription
from launch_ros.actions import ComposableNodeContainer
from launch_ros.descriptions import ComposableNode
from launch.actions import DeclareLaunchArgument
from launch.substitutions import LaunchConfiguration
from carma_ros2_utils.launch.get_current_namespace import GetCurrentNamespace
 
import os
 
 
"""
This file is can be used to launch the CARMA motion_computation_node.
  Though in carma-platform it may be launched directly from the base launch file.
"""
 
 
def generate_launch_description():
    # Declare the log_level launch argument
    log_level = LaunchConfiguration("log_level")
    declare_log_level_arg = DeclareLaunchArgument(
        name="log_level", default_value="WARN"
    )
 
    # Get parameter file path
    param_file_path = os.path.join(
        get_package_share_directory("motion_computation"), "config/parameters.yaml"
    )
 
    # Launch node(s) in a carma container to allow logging to be configured
    container = ComposableNodeContainer(
        package="carma_ros2_utils",
        name="motion_computation_container",
        namespace=GetCurrentNamespace(),
        executable="carma_component_container_mt",
        composable_node_descriptions=[
            # Launch the core node(s)
            ComposableNode(
                package="motion_computation",
                plugin="motion_computation::MotionComputationNode",
                name="motion_computation_node",
                extra_arguments=[
                    {"use_intra_process_comms": True},
                    {"--log-level": log_level},
                ],
                parameters=[param_file_path],
            ),
        ],
    )
 
    return LaunchDescription([declare_log_level_arg, container])