pr2_moveit_controller_manager.cpp

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/* Author: Ioan Sucan, Sachin Chitta, E. Gil Jones */

#include <ros/ros.h>
#include <moveit/controller_manager/controller_manager.h>
#include <control_msgs/FollowJointTrajectoryAction.h>
#include <actionlib/client/simple_action_client.h>
#include <pluginlib/class_list_macros.h>

#include <pr2_mechanism_msgs/ListControllers.h>
#include <pr2_mechanism_msgs/SwitchController.h>
#include <pr2_mechanism_msgs/LoadController.h>
#include <pr2_controllers_msgs/Pr2GripperCommandAction.h>
#include <algorithm>
#include <map>

namespace pr2_moveit_controller_manager
{

static const double DEFAULT_MAX_GRIPPER_EFFORT = 10000.0;

static const double GRIPPER_OPEN = 0.086;

static const double GRIPPER_CLOSED = 0.0;

static const std::string R_GRIPPER_JOINT = "r_gripper_motor_screw_joint";

static const std::string L_GRIPPER_JOINT = "l_gripper_motor_screw_joint";

static const double GAP_CONVERSION_RATIO = 0.1714;

template<typename T>
class ActionBasedControllerHandle : public moveit_controller_manager::MoveItControllerHandle
{
public:
  ActionBasedControllerHandle(const std::string &name, const std::string &ns) :
    moveit_controller_manager::MoveItControllerHandle(name),
    namespace_(ns),
    done_(true)
  {
    controller_action_client_.reset(new actionlib::SimpleActionClient<T>(name_ +"/" + namespace_, true));
    unsigned int attempts = 0;
    while (ros::ok() && !controller_action_client_->waitForServer(ros::Duration(5.0)) && ++attempts < 3)
      ROS_INFO_STREAM("Waiting for " << name_ + "/" + namespace_ << " to come up");

    if (!controller_action_client_->isServerConnected())
    {
      ROS_ERROR_STREAM("Action client not connected: " << name_ + "/" + namespace_);
      controller_action_client_.reset();
    }

    last_exec_ = moveit_controller_manager::ExecutionStatus::SUCCEEDED;
  }

  bool isConnected() const
  {
    return static_cast<bool>(controller_action_client_);
  }

  virtual bool cancelExecution()
  {
    if (!controller_action_client_)
      return false;
    if (!done_)
    {
      ROS_INFO_STREAM("Cancelling execution for " << name_);
      controller_action_client_->cancelGoal();
      last_exec_ = moveit_controller_manager::ExecutionStatus::PREEMPTED;
      done_ = true;
    }
    return true;
  }

  virtual bool waitForExecution(const ros::Duration &timeout = ros::Duration(0))
  {
    if (controller_action_client_ && !done_)
      return controller_action_client_->waitForResult(timeout);
    return true;
  }

  virtual moveit_controller_manager::ExecutionStatus getLastExecutionStatus()
  {
    return last_exec_;
  }

protected:

  void finishControllerExecution(const actionlib::SimpleClientGoalState& state)
  {
    ROS_DEBUG_STREAM("Controller " << name_ << " is done with state " << state.toString() << ": " << state.getText());
    if (state == actionlib::SimpleClientGoalState::SUCCEEDED)
      last_exec_ = moveit_controller_manager::ExecutionStatus::SUCCEEDED;
    else
      if (state == actionlib::SimpleClientGoalState::ABORTED)
        last_exec_ = moveit_controller_manager::ExecutionStatus::ABORTED;
      else
        if (state == actionlib::SimpleClientGoalState::PREEMPTED)
          last_exec_ = moveit_controller_manager::ExecutionStatus::PREEMPTED;
        else
          last_exec_ = moveit_controller_manager::ExecutionStatus::FAILED;
    done_ = true;
  }

  moveit_controller_manager::ExecutionStatus last_exec_;
  std::string namespace_;
  bool done_;
  boost::shared_ptr<actionlib::SimpleActionClient<T> > controller_action_client_;
};

class Pr2GripperControllerHandle : public ActionBasedControllerHandle<pr2_controllers_msgs::Pr2GripperCommandAction>
{
public:
  Pr2GripperControllerHandle(const std::string &name, const std::string &ns  = "gripper_action") :
    ActionBasedControllerHandle<pr2_controllers_msgs::Pr2GripperCommandAction>(name, ns),
    closing_(false)
  {
  }

  virtual bool sendTrajectory(const moveit_msgs::RobotTrajectory &trajectory)
  {
    if (!controller_action_client_)
      return false;
    if (!trajectory.multi_dof_joint_trajectory.points.empty())
    {
      ROS_ERROR("The PR2 gripper controller cannot execute multi-dof trajectories.");
      return false;
    }

    if (trajectory.joint_trajectory.points.back().positions.empty())
    {
      ROS_ERROR("The PR2 gripper controller expects a joint trajectory with one point that specifies at least one position, but 0 positions provided)");
      return false;
    }

    if (trajectory.joint_trajectory.points.size() > 1)
      ROS_DEBUG("The PR2 gripper controller expects a joint trajectory with one point only, but %u provided. Using last point only.", (unsigned int)trajectory.joint_trajectory.points.size());

    int gripper_joint_index = -1;
    for (std::size_t i = 0 ; i < trajectory.joint_trajectory.joint_names.size() ; ++i)
      if (trajectory.joint_trajectory.joint_names[i] == R_GRIPPER_JOINT || trajectory.joint_trajectory.joint_names[i] == L_GRIPPER_JOINT)
      {
    gripper_joint_index = i;
    break;
      }

    if (!trajectory.joint_trajectory.joint_names.empty())
    {
      std::stringstream ss;
      ss << std::endl;
      for (std::size_t i = 0 ; i < trajectory.joint_trajectory.joint_names.size() ; ++i)
        ss << "PR2 gripper trajectory (" << i << "): " << trajectory.joint_trajectory.joint_names[i] << " " << trajectory.joint_trajectory.points[0].positions[i] << std::endl;
      ss << std::endl;
      ROS_DEBUG("%s", ss.str().c_str());
    }

    if (gripper_joint_index == -1)
    {
      ROS_ERROR("Could not find value for gripper virtual joint. Expected joint value for '%s' or '%s'.", L_GRIPPER_JOINT.c_str(), R_GRIPPER_JOINT.c_str());
      return false;
    }

    double gap_opening = trajectory.joint_trajectory.points.back().positions[gripper_joint_index] * GAP_CONVERSION_RATIO;
    ROS_DEBUG("PR2 gripper gap opening: %f", gap_opening);
    closing_ = false;

    if (gap_opening > GRIPPER_OPEN)
    {
      gap_opening = GRIPPER_OPEN;
      closing_ = false;
    }
    else
      if (gap_opening <= 0.0)
      {
        gap_opening = 0.0;
        closing_ = true;
      }

    pr2_controllers_msgs::Pr2GripperCommandGoal goal;
    goal.command.max_effort = DEFAULT_MAX_GRIPPER_EFFORT;

    goal.command.position = gap_opening;
    controller_action_client_->sendGoal(goal,
                                        boost::bind(&Pr2GripperControllerHandle::controllerDoneCallback, this, _1, _2),
                                        boost::bind(&Pr2GripperControllerHandle::controllerActiveCallback, this),
                                        boost::bind(&Pr2GripperControllerHandle::controllerFeedbackCallback, this, _1));
    done_ = false;
    last_exec_ = moveit_controller_manager::ExecutionStatus::RUNNING;
    return true;
  }

private:

  void controllerDoneCallback(const actionlib::SimpleClientGoalState& state,
                              const pr2_controllers_msgs::Pr2GripperCommandResultConstPtr& result)
  {
    // the gripper action reports failure when closing the gripper and an object is inside
    if (state == actionlib::SimpleClientGoalState::ABORTED && closing_)
      finishControllerExecution(actionlib::SimpleClientGoalState::SUCCEEDED);
    else
      finishControllerExecution(state);
  }

  void controllerActiveCallback()
  {
    ROS_DEBUG_STREAM("Controller " << name_ << " started execution");
  }

  void controllerFeedbackCallback(const pr2_controllers_msgs::Pr2GripperCommandFeedbackConstPtr& feedback)
  {
  }

  bool closing_;
};

class Pr2FollowJointTrajectoryControllerHandle : public ActionBasedControllerHandle<control_msgs::FollowJointTrajectoryAction>
{
public:

  Pr2FollowJointTrajectoryControllerHandle(const std::string &name, const std::string &ns = "follow_joint_trajectory") :
    ActionBasedControllerHandle<control_msgs::FollowJointTrajectoryAction>(name, ns)
  {
  }

  virtual bool sendTrajectory(const moveit_msgs::RobotTrajectory &trajectory)
  {
    if (!controller_action_client_)
      return false;
    if (!trajectory.multi_dof_joint_trajectory.points.empty())
    {
      ROS_ERROR("The PR2 FollowJointTrajectory controller cannot execute multi-dof trajectories.");
      return false;
    }
    if (done_)
      ROS_DEBUG_STREAM("Sending trajectory to FollowJointTrajectory action for controller " << name_);
    else
      ROS_DEBUG_STREAM("Sending continuation for the currently executed trajectory to FollowJointTrajectory action for controller " << name_);
    control_msgs::FollowJointTrajectoryGoal goal;
    goal.trajectory = trajectory.joint_trajectory;
    controller_action_client_->sendGoal(goal,
                                        boost::bind(&Pr2FollowJointTrajectoryControllerHandle::controllerDoneCallback, this, _1, _2),
                                        boost::bind(&Pr2FollowJointTrajectoryControllerHandle::controllerActiveCallback, this),
                                        boost::bind(&Pr2FollowJointTrajectoryControllerHandle::controllerFeedbackCallback, this, _1));
    done_ = false;
    last_exec_ = moveit_controller_manager::ExecutionStatus::RUNNING;
    return true;
  }

protected:

  void controllerDoneCallback(const actionlib::SimpleClientGoalState& state,
                              const control_msgs::FollowJointTrajectoryResultConstPtr& result)
  {
    finishControllerExecution(state);
  }

  void controllerActiveCallback()
  {
    ROS_DEBUG_STREAM("Controller " << name_ << " started execution");
  }

  void controllerFeedbackCallback(const control_msgs::FollowJointTrajectoryFeedbackConstPtr& feedback)
  {
  }
};

class Pr2MoveItControllerManager : public moveit_controller_manager::MoveItControllerManager
{
public:

  Pr2MoveItControllerManager() : node_handle_("~")
  {
    if (node_handle_.hasParam("controller_manager_name"))
      node_handle_.getParam("controller_manager_name", controller_manager_name_);
    if (controller_manager_name_.empty())
      node_handle_.param("pr2_controller_manager_name", controller_manager_name_, std::string("pr2_controller_manager"));
    if (node_handle_.hasParam("use_controller_manager")) // 'use_controller_manager' is the old name
      node_handle_.param("use_controller_manager", use_controller_manager_, true);
    else
      node_handle_.param("use_pr2_controller_manager", use_controller_manager_, true);

    XmlRpc::XmlRpcValue controller_list;
    if (node_handle_.hasParam("controller_list"))
    {
      node_handle_.getParam("controller_list", controller_list);
      if (controller_list.getType() != XmlRpc::XmlRpcValue::TypeArray)
        ROS_WARN("Controller list should be specified as an array");
      else
        for (int i = 0 ; i < controller_list.size() ; ++i)
          if (!controller_list[i].hasMember("name") || !controller_list[i].hasMember("joints"))
            ROS_WARN("Name and joints must be specifed for each controller");
          else
          {
            try
            {
              ControllerInformation ci;
              std::string name = std::string(controller_list[i]["name"]);
              if (controller_list[i].hasMember("default"))
              {
                try
                {
                  if (controller_list[i]["default"].getType() == XmlRpc::XmlRpcValue::TypeBoolean)
                  {
                    ci.default_ = controller_list[i]["default"];
                  }
                  else
                  {
                    std::string def = std::string(controller_list[i]["default"]);
                    std::transform(def.begin(), def.end(), def.begin(), ::tolower);
                    if (def == "true" || def == "yes")
                      ci.default_ = true;
                  }
                }
                catch (...)
                {
                }
              }
              // 'ns' is the old name; use action_ns instead
              if (controller_list[i].hasMember("ns"))
              {
                ci.ns_ = std::string(controller_list[i]["ns"]);
                ROS_WARN("'ns' argument specified. Please use 'action_ns' instead.");
              }
              if (controller_list[i].hasMember("action_ns"))
                ci.ns_ = std::string(controller_list[i]["action_ns"]);
              if (controller_list[i]["joints"].getType() == XmlRpc::XmlRpcValue::TypeArray)
              {
                int nj = controller_list[i]["joints"].size();
                for (int j = 0 ; j < nj ; ++j)
                  ci.joints_.push_back(std::string(controller_list[i]["joints"][j]));
              }
              else
                ROS_WARN_STREAM("The list of joints for controller " << name << " is not specified as an array");
              if (!ci.joints_.empty())
                possibly_unloaded_controllers_[name] = ci;
            }
            catch (...)
            {
              ROS_ERROR("Unable to parse controller information");
            }
          }
    }
    else
    {
      if (use_controller_manager_)
        ROS_DEBUG_STREAM("No controller list specified. Using list obtained from the " << controller_manager_name_);
      else
        ROS_ERROR_STREAM("Not using a controller manager and no controllers specified. There are no known controllers.");
    }

    if (use_controller_manager_)
    {
      static const unsigned int max_attempts = 5;
      unsigned int attempts = 0;
      while (ros::ok() && !ros::service::waitForService(controller_manager_name_ + "/list_controllers", ros::Duration(5.0)) && ++attempts < max_attempts)
        ROS_INFO_STREAM("Waiting for service " << controller_manager_name_ + "/list_controllers" << " to come up");

      if (attempts < max_attempts)
        while (ros::ok() && !ros::service::waitForService(controller_manager_name_ + "/switch_controller", ros::Duration(5.0)) && ++attempts < max_attempts)
          ROS_INFO_STREAM("Waiting for service " << controller_manager_name_ + "/switch_controller" << " to come up");

      if (attempts < max_attempts)
        while (ros::ok() && !ros::service::waitForService(controller_manager_name_ + "/load_controller", ros::Duration(5.0))  && ++attempts < max_attempts)
          ROS_INFO_STREAM("Waiting for service " << controller_manager_name_ + "/load_controller" << " to come up");

      if (attempts < max_attempts)
      {
        lister_service_ = root_node_handle_.serviceClient<pr2_mechanism_msgs::ListControllers>(controller_manager_name_ + "/list_controllers", true);
        switcher_service_ = root_node_handle_.serviceClient<pr2_mechanism_msgs::SwitchController>(controller_manager_name_ + "/switch_controller", true);
        loader_service_ = root_node_handle_.serviceClient<pr2_mechanism_msgs::LoadController>(controller_manager_name_ + "/load_controller", true);
      }
      else
        ROS_ERROR("Not using the PR2 controller manager");
    }
  }

  virtual ~Pr2MoveItControllerManager()
  {
  }

  virtual moveit_controller_manager::MoveItControllerHandlePtr getControllerHandle(const std::string &name)
  {
    std::map<std::string, moveit_controller_manager::MoveItControllerHandlePtr>::const_iterator it = handle_cache_.find(name);
    if (it != handle_cache_.end())
      return it->second;

    moveit_controller_manager::MoveItControllerHandlePtr new_handle;
    if (possibly_unloaded_controllers_.find(name) != possibly_unloaded_controllers_.end())
    {
      const std::string &ns = possibly_unloaded_controllers_.at(name).ns_;
      new_handle = getControllerHandleHelper(name, ns);
    }
    else
      new_handle = getControllerHandleHelper(name, "");

    if (new_handle)
      handle_cache_[name] = new_handle;
    return new_handle;
  }

  virtual void getControllersList(std::vector<std::string> &names)
  {
    const pr2_mechanism_msgs::ListControllers::Response &res = getListControllerServiceResponse();
    std::set<std::string> names_set;
    names_set.insert(res.controllers.begin(), res.controllers.end());

    for (std::map<std::string, ControllerInformation>::const_iterator it = possibly_unloaded_controllers_.begin() ; it != possibly_unloaded_controllers_.end() ; ++it)
      names_set.insert(it->first);

    names.clear();
    names.insert(names.end(), names_set.begin(), names_set.end());
  }

  virtual void getActiveControllers(std::vector<std::string> &names)
  {
    names.clear();
    if (use_controller_manager_)
    {
      const pr2_mechanism_msgs::ListControllers::Response &res = getListControllerServiceResponse();
      for (std::size_t i = 0; i < res.controllers.size(); ++i)
        if (res.state[i] == "running")
          names.push_back(res.controllers[i]);
    }
    else
      // we assume best case scenario if we can't test whether the controller is active or not
      for (std::map<std::string, ControllerInformation>::const_iterator it = possibly_unloaded_controllers_.begin() ; it != possibly_unloaded_controllers_.end() ; ++it)
        names.push_back(it->first);
  }

  virtual void getControllerJoints(const std::string &name, std::vector<std::string> &joints)
  {
    std::map<std::string, ControllerInformation>::const_iterator it = possibly_unloaded_controllers_.find(name);
    if (it != possibly_unloaded_controllers_.end())
      joints = it->second.joints_;
    else
    {
      joints.clear();
      std::string param_name;
      if (node_handle_.searchParam(name + "/joints", param_name))
      {
        XmlRpc::XmlRpcValue joints_list;
        node_handle_.getParam(param_name, joints_list);
        if (joints_list.getType() == XmlRpc::XmlRpcValue::TypeArray)
          for (int i = 0 ; i < joints_list.size() ; ++i)
            joints.push_back((std::string)joints_list[i]);
      }
      else
        if (node_handle_.searchParam(name + "/joint", param_name))
        {
          std::string joint_name;
          if (node_handle_.getParam(param_name, joint_name))
            joints.push_back(joint_name);
        }
      if (joints.empty())
        ROS_INFO("The joints for controller '%s' are not known and were not found on the ROS param server under '%s/joints'or '%s/joint'. "
                 "Perhaps the controller configuration is not loaded on the param server?", name.c_str(), name.c_str(), name.c_str());
      ControllerInformation &ci = possibly_unloaded_controllers_[name];
      ci.joints_ = joints;
    }
  }

  virtual moveit_controller_manager::MoveItControllerManager::ControllerState getControllerState(const std::string &name)
  {
    moveit_controller_manager::MoveItControllerManager::ControllerState state;
    if (use_controller_manager_)
    {
      const pr2_mechanism_msgs::ListControllers::Response &res = getListControllerServiceResponse();
      for (std::size_t i = 0; i < res.controllers.size(); ++i)
      {
        if (res.controllers[i] == name)
        {
          if (res.state[i] == "running")
            state.active_ = true;
          break;
        }
      }
    }
    else
    {
      // if we cannot test, assume best case scenario.
      state.active_ = true;
    }

    std::map<std::string, ControllerInformation>::const_iterator it = possibly_unloaded_controllers_.find(name);
    if (it != possibly_unloaded_controllers_.end())
      if (it->second.default_)
        state.default_ = true;
    return state;
  }

  virtual bool switchControllers(const std::vector<std::string> &activate, const std::vector<std::string> &deactivate)
  {
    if (!use_controller_manager_)
    {
      ROS_WARN_STREAM("Cannot switch controllers without using the controller manager");
      return false;
    }

    if (!activate.empty())
    {
      // load controllers to be activated, if needed
      const std::vector<std::string> &loaded_c = getListControllerServiceResponse().controllers;
      std::set<std::string> loaded_c_set(loaded_c.begin(), loaded_c.end());
      for (std::size_t i = 0 ; i < activate.size() ; ++i)
        if (loaded_c_set.find(activate[i]) == loaded_c_set.end())
        {
          handle_cache_.erase(activate[i]);
          pr2_mechanism_msgs::LoadController::Request req;
          pr2_mechanism_msgs::LoadController::Response res;
          req.name = activate[i];
          if (!loader_service_.call(req, res))
          {
            ROS_WARN("Something went wrong with loader service while trying to load '%s'", req.name.c_str());
            return false;
          }
          if (!res.ok)
          {
            ROS_WARN("Loading controller '%s' failed", req.name.c_str());
            return false;
          }
        }
    }

    last_lister_response_ = ros::Time();
    pr2_mechanism_msgs::SwitchController::Request req;
    pr2_mechanism_msgs::SwitchController::Response res;

    req.strictness = pr2_mechanism_msgs::SwitchController::Request::BEST_EFFORT;
    req.start_controllers = activate;
    req.stop_controllers = deactivate;
    if (!switcher_service_.call(req, res))
    {
      ROS_WARN_STREAM("Something went wrong with switcher service");
      return false;
    }
    if (!res.ok)
      ROS_WARN_STREAM("Switcher service failed");
    return res.ok;
  }

protected:

  const pr2_mechanism_msgs::ListControllers::Response &getListControllerServiceResponse()
  {
    if (use_controller_manager_)
    {
      static const ros::Duration max_cache_age(1.0);
      if ((ros::Time::now() - last_lister_response_) > max_cache_age)
      {
        pr2_mechanism_msgs::ListControllers::Request req;
        if (!lister_service_.call(req, cached_lister_response_))
          ROS_WARN_STREAM("Something went wrong with lister service");
        last_lister_response_ = ros::Time::now();
      }
    }
    return cached_lister_response_;
  }

  moveit_controller_manager::MoveItControllerHandlePtr getControllerHandleHelper(const std::string &name, const std::string &ns)
  {
    moveit_controller_manager::MoveItControllerHandlePtr new_handle;
    if (name == "l_gripper_controller" || name == "r_gripper_controller")
    {
      new_handle.reset(ns.empty() ? new Pr2GripperControllerHandle(name) : new Pr2GripperControllerHandle(name, ns));
      if (!static_cast<Pr2GripperControllerHandle*>(new_handle.get())->isConnected())
        new_handle.reset();
    }
    else
    {
      new_handle.reset(ns.empty() ? new Pr2FollowJointTrajectoryControllerHandle(name) : new Pr2FollowJointTrajectoryControllerHandle(name, ns));
      if (!static_cast<Pr2FollowJointTrajectoryControllerHandle*>(new_handle.get())->isConnected())
        new_handle.reset();
    }
    return new_handle;
  }

  ros::NodeHandle node_handle_;
  ros::NodeHandle root_node_handle_;

  std::string controller_manager_name_;
  bool use_controller_manager_;
  ros::ServiceClient loader_service_;
  ros::ServiceClient switcher_service_;
  ros::ServiceClient lister_service_;

  ros::Time last_lister_response_;
  pr2_mechanism_msgs::ListControllers::Response cached_lister_response_;

  std::map<std::string, moveit_controller_manager::MoveItControllerHandlePtr> handle_cache_;

  struct ControllerInformation
  {
    ControllerInformation() : default_(false)
    {
    }

    bool default_;
    std::string ns_;
    std::vector<std::string> joints_;
  };
  std::map<std::string, ControllerInformation> possibly_unloaded_controllers_;
};

}

PLUGINLIB_EXPORT_CLASS(pr2_moveit_controller_manager::Pr2MoveItControllerManager,
                       moveit_controller_manager::MoveItControllerManager);