add spawner for hardware (ros-controls#941)

* add spwaner for hardware

* aplly suggestions from code review

* move comment

controller_manager/controller_manager/__init__.py

@@ -20,6 +20,7 @@
     list_hardware_interfaces,
     load_controller,
     reload_controller_libraries,
+    set_hardware_component_state,
     switch_controllers,
     unload_controller,
 )
@@ -32,6 +33,7 @@
     "list_hardware_interfaces",
     "load_controller",
     "reload_controller_libraries",
+    "set_hardware_component_state",
     "switch_controllers",
     "unload_controller",
 ]

controller_manager/controller_manager/controller_manager_services.py

@@ -20,6 +20,7 @@
     ListHardwareInterfaces,
     LoadController,
     ReloadControllerLibraries,
+    SetHardwareComponentState,
     SwitchController,
     UnloadController,
 )
@@ -107,6 +108,18 @@ def reload_controller_libraries(node, controller_manager_name, force_kill):
     )
 
 
+def set_hardware_component_state(node, controller_manager_name, component_name, lifecyle_state):
+    request = SetHardwareComponentState.Request()
+    request.name = component_name
+    request.target_state = lifecyle_state
+    return service_caller(
+        node,
+        f"{controller_manager_name}/set_hardware_component_state",
+        SetHardwareComponentState,
+        request,
+    )
+
+
 def switch_controllers(
     node,
     controller_manager_name,

controller_manager/controller_manager/hardware_spawner.py

@@ -0,0 +1,227 @@
+#!/usr/bin/env python3
+# Copyright 2023 Stogl Robotics Consulting UG (haftungsbeschränkt)
+#
+# 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.
+
+import argparse
+import sys
+import time
+
+from controller_manager import set_hardware_component_state
+
+from lifecycle_msgs.msg import State
+import rclpy
+from rclpy.duration import Duration
+from rclpy.node import Node
+from rclpy.signals import SignalHandlerOptions
+
+
+# from https://stackoverflow.com/a/287944
+class bcolors:
+    HEADER = "\033[95m"
+    OKBLUE = "\033[94m"
+    OKCYAN = "\033[96m"
+    OKGREEN = "\033[92m"
+    WARNING = "\033[93m"
+    FAIL = "\033[91m"
+    ENDC = "\033[0m"
+    BOLD = "\033[1m"
+    UNDERLINE = "\033[4m"
+
+
+def first_match(iterable, predicate):
+    return next((n for n in iterable if predicate(n)), None)
+
+
+def wait_for_value_or(function, node, timeout, default, description):
+    while node.get_clock().now() < timeout:
+        if result := function():
+            return result
+        node.get_logger().info(
+            f"Waiting for {description}", throttle_duration_sec=2, skip_first=True
+        )
+        time.sleep(0.2)
+    return default
+
+
+def combine_name_and_namespace(name_and_namespace):
+    node_name, namespace = name_and_namespace
+    return namespace + ("" if namespace.endswith("/") else "/") + node_name
+
+
+def find_node_and_namespace(node, full_node_name):
+    node_names_and_namespaces = node.get_node_names_and_namespaces()
+    return first_match(
+        node_names_and_namespaces,
+        lambda n: combine_name_and_namespace(n) == full_node_name,
+    )
+
+
+def has_service_names(node, node_name, node_namespace, service_names):
+    client_names_and_types = node.get_service_names_and_types_by_node(node_name, node_namespace)
+    if not client_names_and_types:
+        return False
+    client_names, _ = zip(*client_names_and_types)
+    return all(service in client_names for service in service_names)
+
+
+def wait_for_controller_manager(node, controller_manager, timeout_duration):
+    # List of service names from controller_manager we wait for
+    service_names = (
+        f"{controller_manager}/list_hardware_components",
+        f"{controller_manager}/set_hardware_component_state",
+    )
+
+    # Wait for controller_manager
+    timeout = node.get_clock().now() + Duration(seconds=timeout_duration)
+    node_and_namespace = wait_for_value_or(
+        lambda: find_node_and_namespace(node, controller_manager),
+        node,
+        timeout,
+        None,
+        f"'{controller_manager}' node to exist",
+    )
+
+    # Wait for the services if the node was found
+    if node_and_namespace:
+        node_name, namespace = node_and_namespace
+        return wait_for_value_or(
+            lambda: has_service_names(node, node_name, namespace, service_names),
+            node,
+            timeout,
+            False,
+            f"'{controller_manager}' services to be available",
+        )
+
+    return False
+
+
+def handle_set_component_state_service_call(
+    node, controller_manager_name, component, target_state, action
+):
+    response = set_hardware_component_state(node, controller_manager_name, component, target_state)
+    if response.ok and response.state == target_state:
+        node.get_logger().info(
+            bcolors.OKGREEN
+            + f"{action} component '{component}'. Hardware now in state: {response.state}."
+        )
+    elif response.ok and not response.state == target_state:
+        node.get_logger().warn(
+            bcolors.WARNING
+            + f"Could not {action} component '{component}'. Service call returned ok=True, but state: {response.state} is not equal to target state '{target_state}'."
+        )
+    else:
+        node.get_logger().warn(
+            bcolors.WARNING
+            + f"Could not {action} component '{component}'. Service call failed. Wrong component name?"
+        )
+
+
+def activate_components(node, controller_manager_name, components_to_activate):
+    active_state = State()
+    active_state.id = State.PRIMARY_STATE_ACTIVE
+    active_state.label = "active"
+    for component in components_to_activate:
+        handle_set_component_state_service_call(
+            node, controller_manager_name, component, active_state, "activated"
+        )
+
+
+def configure_components(node, controller_manager_name, components_to_configure):
+    inactive_state = State()
+    inactive_state.id = State.PRIMARY_STATE_INACTIVE
+    inactive_state.label = "inactive"
+    for component in components_to_configure:
+        handle_set_component_state_service_call(
+            node, controller_manager_name, component, inactive_state, "configured"
+        )
+
+
+def main(args=None):
+    rclpy.init(args=args, signal_handler_options=SignalHandlerOptions.NO)
+    parser = argparse.ArgumentParser()
+    activate_or_confiigure_grp = parser.add_mutually_exclusive_group(required=True)
+
+    parser.add_argument(
+        "hardware_component_name",
+        help="The name of the hardware component which should be activated.",
+    )
+    parser.add_argument(
+        "-c",
+        "--controller-manager",
+        help="Name of the controller manager ROS node",
+        default="controller_manager",
+        required=False,
+    )
+    parser.add_argument(
+        "--controller-manager-timeout",
+        help="Time to wait for the controller manager",
+        required=False,
+        default=10,
+        type=int,
+    )
+
+    # add arguments which are mutually exclusive
+    activate_or_confiigure_grp.add_argument(
+        "--activate",
+        help="Activates the given components. Note: Components are by default configured before activated. ",
+        action="store_true",
+        required=False,
+    )
+    activate_or_confiigure_grp.add_argument(
+        "--configure",
+        help="Configures the given components.",
+        action="store_true",
+        required=False,
+    )
+
+    command_line_args = rclpy.utilities.remove_ros_args(args=sys.argv)[1:]
+    args = parser.parse_args(command_line_args)
+    controller_manager_name = args.controller_manager
+    controller_manager_timeout = args.controller_manager_timeout
+    hardware_component = [args.hardware_component_name]
+    activate = args.activate
+    configure = args.configure
+
+    node = Node("hardware_spawner")
+    if not controller_manager_name.startswith("/"):
+        spawner_namespace = node.get_namespace()
+        if spawner_namespace != "/":
+            controller_manager_name = f"{spawner_namespace}/{controller_manager_name}"
+        else:
+            controller_manager_name = f"/{controller_manager_name}"
+
+    try:
+        if not wait_for_controller_manager(
+            node, controller_manager_name, controller_manager_timeout
+        ):
+            node.get_logger().error("Controller manager not available")
+            return 1
+
+        if activate:
+            activate_components(node, controller_manager_name, hardware_component)
+        elif configure:
+            configure_components(node, controller_manager_name, hardware_component)
+        else:
+            node.get_logger().error(
+                'You need to either specify if the hardware component should be activated with the "--activate" flag or configured with the "--configure" flag'
+            )
+            parser.print_help()
+            return 0
+    finally:
+        rclpy.shutdown()
+
+
+if __name__ == "__main__":
+    ret = main()
+    sys.exit(ret)

controller_manager/setup.cfg

@@ -2,3 +2,4 @@
 console_scripts =
     spawner = controller_manager.spawner:main
     unspawner = controller_manager.unspawner:main
+    hardware_spawner = controller_manager.hardware_spawner:main

controller_manager/src/controller_manager.cpp

@@ -196,27 +196,42 @@ void ControllerManager::init_resource_manager(const std::string & robot_descript
   using lifecycle_msgs::msg::State;
 
   std::vector<std::string> configure_components_on_start = std::vector<std::string>({});
-  get_parameter("configure_components_on_start", configure_components_on_start);
-  rclcpp_lifecycle::State inactive_state(
-    State::PRIMARY_STATE_INACTIVE, hardware_interface::lifecycle_state_names::INACTIVE);
-  for (const auto & component : configure_components_on_start)
+  if (get_parameter("configure_components_on_start", configure_components_on_start))
   {
-    resource_manager_->set_component_state(component, inactive_state);
+    RCLCPP_WARN_STREAM(
+      get_logger(),
+      "[Deprecated]: Usage of parameter \"activate_components_on_start\" is deprecated. Use "
+      "hardware_spawner instead.");
+    rclcpp_lifecycle::State inactive_state(
+      State::PRIMARY_STATE_INACTIVE, hardware_interface::lifecycle_state_names::INACTIVE);
+    for (const auto & component : configure_components_on_start)
+    {
+      resource_manager_->set_component_state(component, inactive_state);
+    }
   }
 
   std::vector<std::string> activate_components_on_start = std::vector<std::string>({});
-  get_parameter("activate_components_on_start", activate_components_on_start);
-  rclcpp_lifecycle::State active_state(
-    State::PRIMARY_STATE_ACTIVE, hardware_interface::lifecycle_state_names::ACTIVE);
-  for (const auto & component : activate_components_on_start)
+  if (get_parameter("activate_components_on_start", activate_components_on_start))
   {
-    resource_manager_->set_component_state(component, active_state);
+    RCLCPP_WARN_STREAM(
+      get_logger(),
+      "[Deprecated]: Usage of parameter \"activate_components_on_start\" is deprecated. Use "
+      "hardware_spawner instead.");
+    rclcpp_lifecycle::State active_state(
+      State::PRIMARY_STATE_ACTIVE, hardware_interface::lifecycle_state_names::ACTIVE);
+    for (const auto & component : activate_components_on_start)
+    {
+      resource_manager_->set_component_state(component, active_state);
+    }
   }
-
   // if both parameter are empty or non-existing preserve behavior where all components are
   // activated per default
   if (configure_components_on_start.empty() && activate_components_on_start.empty())
   {
+    RCLCPP_WARN_STREAM(
+      get_logger(),
+      "[Deprecated]: Automatic activation of all hardware components will not be supported in the "
+      "future anymore. Use hardware_spawner instead.");
     resource_manager_->activate_all_components();
   }
 }