openarm_ros2/openarm_bringup/scripts/motor_disable_service.py

#!/usr/bin/env python3

# Copyright 2026 Enactic, Inc.
#
# 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 typing import List

import rclpy
from controller_manager_msgs.srv import SetHardwareComponentState
from lifecycle_msgs.msg import State
from rclpy.node import Node
from std_srvs.srv import Trigger


class MotorDisableServiceNode(Node):
    """Expose a simple Trigger service to disable arm motors via ros2_control."""

    def __init__(self) -> None:
        super().__init__("motor_disable_service")

        self.declare_parameter("controller_manager_name", "/controller_manager")
        self.declare_parameter(
            "hardware_components",
            ["openarm_left_hardware_interface", "openarm_right_hardware_interface"],
        )
        self.declare_parameter("service_name", "disable_motors")
        self.declare_parameter("service_timeout_sec", 3.0)

        controller_manager_name = (
            self.get_parameter("controller_manager_name").get_parameter_value().string_value
        )
        service_name = self.get_parameter("service_name").get_parameter_value().string_value

        self._component_names = self._read_component_names()
        self._service_timeout_sec = (
            self.get_parameter("service_timeout_sec").get_parameter_value().double_value
        )

        if not controller_manager_name.startswith("/"):
            controller_manager_name = "/" + controller_manager_name
        controller_manager_name = controller_manager_name.rstrip("/")

        set_state_service = f"{controller_manager_name}/set_hardware_component_state"
        self._set_state_client = self.create_client(
            SetHardwareComponentState,
            set_state_service,
        )

        self.create_service(Trigger, service_name, self._handle_disable_request)

        self.get_logger().info(
            f"Motor disable service ready: service='{service_name}', "
            f"cm='{controller_manager_name}', components={self._component_names}"
        )

    def _read_component_names(self) -> List[str]:
        raw_value = (
            self.get_parameter("hardware_components")
            .get_parameter_value()
            .string_array_value
        )
        component_names = [name.strip() for name in raw_value if name.strip()]
        return component_names

    def _handle_disable_request(
        self, _request: Trigger.Request, response: Trigger.Response
    ) -> Trigger.Response:
        if not self._component_names:
            response.success = False
            response.message = "No hardware_components configured."
            return response

        if not self._set_state_client.wait_for_service(timeout_sec=self._service_timeout_sec):
            response.success = False
            response.message = "controller_manager set_hardware_component_state service not available."
            return response

        failed_components = []
        for component_name in self._component_names:
            if not self._set_component_inactive(component_name):
                failed_components.append(component_name)

        if failed_components:
            response.success = False
            response.message = "Failed to disable components: " + ", ".join(failed_components)
            return response

        response.success = True
        response.message = "Motors disabled for: " + ", ".join(self._component_names)
        return response

    def _set_component_inactive(self, component_name: str) -> bool:
        request = SetHardwareComponentState.Request()
        request.name = component_name
        request.target_state.id = State.PRIMARY_STATE_INACTIVE
        request.target_state.label = "inactive"

        future = self._set_state_client.call_async(request)
        rclpy.spin_until_future_complete(self, future, timeout_sec=self._service_timeout_sec)

        if not future.done() or future.result() is None:
            self.get_logger().error(
                f"Timeout or empty response when disabling hardware component '{component_name}'."
            )
            return False

        result = future.result()
        if not result.ok:
            self.get_logger().error(
                f"controller_manager rejected disable request for '{component_name}' "
                f"(state={result.state.id}:{result.state.label})."
            )
            return False

        self.get_logger().info(
            f"Disabled component '{component_name}' -> "
            f"state={result.state.id}:{result.state.label}"
        )
        return True


def main(args=None) -> None:
    rclpy.init(args=args)
    node = MotorDisableServiceNode()
    try:
        rclpy.spin(node)
    except KeyboardInterrupt:
        pass
    finally:
        node.destroy_node()
        rclpy.shutdown()


if __name__ == "__main__":
    main()