rtt_action_server.h

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#ifndef __RTT_ACTION_SERVER_H
#define __RTT_ACTION_SERVER_H

#include <rtt/RTT.hpp>
#include <rtt/os/Timer.hpp>
#include <rtt/plugin/ServicePlugin.hpp>
#include <rtt/internal/GlobalService.hpp>

#include <actionlib/action_definition.h>
#include <actionlib/server/action_server_base.h>

#include <rtt_actionlib/rtt_actionlib.h>

#include <rtt_rosclock/rtt_rosclock.h>
#include <rtt_roscomm/rostopic.h>

namespace rtt_actionlib {

  // Forward declaration
  template<class ActionSpec>
  class RTTActionServer;

  template<class ActionSpec>
  class RTTActionServerStatusTimer : public RTT::os::Timer 
  {
  public:
    RTTActionServerStatusTimer(RTTActionServer<ActionSpec> &server, int scheduler = ORO_SCHED_OTHER) :
      RTT::os::Timer(1,-1),
      server_(server) 
    { 
      mThread = new RTT::Activity(scheduler, 0, 0.0, this, server.getName()+"_status_timer");
      mThread->start();
    }

    virtual ~RTTActionServerStatusTimer() { }

    virtual void timeout(RTT::os::Timer::TimerId timer_id) {
      server_.publishStatus();
    }
  private:
    RTTActionServer<ActionSpec> &server_;
  };

  template<class ActionSpec>
  class RTTActionServer : public actionlib::ActionServerBase<ActionSpec>
  {
  public:
    // Generates typedefs that make our lives easier
    ACTION_DEFINITION(ActionSpec);

    typedef actionlib::ServerGoalHandle<ActionSpec> GoalHandle;

    RTTActionServer(const double status_period = 0.200, const int sched = ORO_SCHED_OTHER);
    RTTActionServer(const std::string name, const double status_period = 0.200, const int sched = ORO_SCHED_OTHER);
    virtual ~RTTActionServer();

    const std::string getName() const { return name_; };

    bool addPorts(RTT::Service::shared_ptr service,
        const bool create_topics = false,
        const std::string &topic_namespace = "");

    bool ready();

    void shutdown();

    virtual void initialize();

    virtual void publishResult(const actionlib_msgs::GoalStatus& status, const Result& result);

    virtual void publishFeedback(const actionlib_msgs::GoalStatus& status, const Feedback& feedback);

    virtual void publishStatus();

    void registerGoalOperation(RTT::OperationInterfacePart* operation) {
      goal_operation_ = operation; 
      this->registerGoalCallback(boost::bind(&RTTActionServer<ActionSpec>::goalCallbackWrapper, this, _1));
    }

    void registerCancelOperation(RTT::OperationInterfacePart* operation) {
      cancel_operation_ = operation; 
    }
    
  private:

    /* \brief Wrapper for action server base goalCallback
     * This function is called when messages arrive on the goal RTT port. It
     * then reads the port and calls ActionServerBase::goalCallback, which, in
     * turn, calls the user supplied goal callback.
     */
    void goalCallback(RTT::base::PortInterface* port);
    void goalCallbackWrapper(GoalHandle gh);

    /* \brief Wrapper for action server base cancelCallback 
     * This function is called when messages arrive on the goal RTT port. It
     * then reads the port and calls ActionServerBase::cancelCallback, which, in
     * turn, calls the user supplied cancel callback.
     */
    void cancelCallback(RTT::base::PortInterface* port);

    std::string name_;

    double status_period_;

    rtt_actionlib::ActionBridge action_bridge_;

    RTTActionServerStatusTimer<ActionSpec> status_timer_;

    RTT::OperationCaller<void(GoalHandle)> goal_operation_;
    RTT::OperationCaller<void(GoalHandle)> cancel_operation_;
  };

  template <class ActionSpec>
    RTTActionServer<ActionSpec>::RTTActionServer(const double status_period, const int sched) :
      actionlib::ActionServerBase<ActionSpec>(boost::function<void (GoalHandle)>(), boost::function<void (GoalHandle)>(), false),
      name_("action_server"),
      status_period_(status_period),
      status_timer_(*this,sched)
  {
  }

  template <class ActionSpec>
    RTTActionServer<ActionSpec>::RTTActionServer(const std::string name, const double status_period, const int sched) :
      actionlib::ActionServerBase<ActionSpec>(boost::function<void (GoalHandle)>(), boost::function<void (GoalHandle)>(), false),
      name_(name),
      status_period_(status_period),
      status_timer_(*this, sched)
  {

  }

  template <class ActionSpec>
    RTTActionServer<ActionSpec>::~RTTActionServer()
    {

    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::initialize()
    {
      if(this->ready()) {
        // Start status publish timer 
        if(!status_timer_.startTimer(0,status_period_)) {
          RTT::log(RTT::Error) << "Failed to initialize RTT Action Server: could not start status publisher timer." << RTT::endlog();
        }
      } else {
        RTT::log(RTT::Error) << "Failed to initialize RTT Action Server: ports not ready." << RTT::endlog();
      }
    }

  template <class ActionSpec>
    bool RTTActionServer<ActionSpec>::ready() 
    {
      return action_bridge_.allConnected();
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::shutdown()
    {
        status_timer_.killTimer(0);
    }

  template <class ActionSpec>
    bool RTTActionServer<ActionSpec>::addPorts(
        RTT::Service::shared_ptr service,
        const bool create_topics,
        const std::string &topic_namespace)
    {
      // Try to get existing ports from service
      if(!action_bridge_.setPortsFromService(service)) {
        // Create the ports
        if(!action_bridge_.createServerPorts<ActionSpec>()) {
          return false;
        }
      }

      // Add the ports to the service
      service->addEventPort(
          action_bridge_.goalInput<ActionSpec>(), 
          boost::bind(&RTTActionServer<ActionSpec>::goalCallback, this, _1))
        .doc("Actionlib goal port. Do not read from this port directly.");

      service->addEventPort(
          action_bridge_.cancelInput(), 
          boost::bind(&RTTActionServer<ActionSpec>::cancelCallback, this, _1))
        .doc("Actionlib cancel port. Do not read from this port directly.");

      service->addPort(action_bridge_.resultOutput<ActionSpec>())
        .doc("Actionlib result port. Do not write to this port directly.");

      service->addPort(action_bridge_.statusOutput())
        .doc("Actionlib result port. Do not write to this port directly.");

      service->addPort(action_bridge_.feedbackOutput<ActionSpec>())
        .doc("Actionlib result port. Do not write to this port directly.");

      // Create ROS topics
      if(create_topics) {
        action_bridge_.goalInput<ActionSpec>().createStream(rtt_roscomm::topic(topic_namespace+"goal"));
        action_bridge_.cancelInput().createStream(rtt_roscomm::topic(topic_namespace+"cancel"));
        action_bridge_.resultOutput<ActionSpec>().createStream(rtt_roscomm::topic(topic_namespace+"result"));
        action_bridge_.statusOutput().createStream(rtt_roscomm::topic(topic_namespace+"status"));
        action_bridge_.feedbackOutput<ActionSpec>().createStream(rtt_roscomm::topic(topic_namespace+"feedback"));
      }

      return true;
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::goalCallback(RTT::base::PortInterface* port)
    {
      ActionGoal goal;
      // Read the goal from the RTT port
      if(action_bridge_.goalInput<ActionSpec>().read(goal) == RTT::NewData) {
        // The action server base class expects a shared pointer
        actionlib::ActionServerBase<ActionSpec>::goalCallback(
            boost::make_shared<const ActionGoal>(goal));
      }
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::goalCallbackWrapper(GoalHandle gh)
    {
      if(goal_operation_.ready()) {
        goal_operation_(gh);
      } 
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::cancelCallback(RTT::base::PortInterface* port)
    {
      actionlib_msgs::GoalID goal_id;
      // Read the goal id from the RTT port
      if(action_bridge_.cancelInput().read(goal_id) == RTT::NewData) {
        // The action server base class expects a shared pointer
        actionlib::ActionServerBase<ActionSpec>::cancelCallback(
            boost::make_shared<const actionlib_msgs::GoalID>(goal_id));
      }
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::publishResult(
        const actionlib_msgs::GoalStatus& status,
        const Result& result)
    {
      ACTION_DEFINITION(ActionSpec);

      boost::recursive_mutex::scoped_lock lock(this->lock_);

      // Create the action result container
      ActionResult action_result;
      action_result.header.stamp = rtt_rosclock::host_now();
      action_result.status = status;
      action_result.result = result;

      //ROS_DEBUG_NAMED("actionlib", "Publishing result for goal with id: %s and stamp: %.2f", status.goal_id.id.c_str(), status.goal_id.stamp.toSec());

      // Write the result to the RTT data port
      action_bridge_.resultOutput<ActionSpec>().write(action_result);

      this->publishStatus();
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::publishFeedback(
        const actionlib_msgs::GoalStatus& status,
        const Feedback& feedback)
    {
      ACTION_DEFINITION(ActionSpec);

      boost::recursive_mutex::scoped_lock lock(this->lock_);

      // Create the action result container
      ActionFeedback action_feedback;
      action_feedback.header.stamp = rtt_rosclock::host_now();
      action_feedback.status = status;
      action_feedback.feedback = feedback;

      //ROS_DEBUG_NAMED("actionlib", "Publishing result for goal with id: %s and stamp: %.2f", status.goal_id.id.c_str(), status.goal_id.stamp.toSec());

      // Write the feedback to the RTT data port
      action_bridge_.feedbackOutput<ActionSpec>().write(action_feedback);
    }

  template <class ActionSpec>
    void RTTActionServer<ActionSpec>::publishStatus()
    {
      boost::recursive_mutex::scoped_lock lock(this->lock_);

      // Build a status array
      actionlib_msgs::GoalStatusArray status_array;

      status_array.header.stamp = rtt_rosclock::host_now();

      status_array.status_list.resize(this->status_list_.size());

      unsigned int i = 0;
      for(typename std::list<actionlib::StatusTracker<ActionSpec> >::iterator it = this->status_list_.begin();
          it != this->status_list_.end();
          ++i)
      {
        status_array.status_list[i] = (*it).status_;

        // Check if the item is due for deletion from the status list
        if((*it).handle_destruction_time_ != ros::Time() &&
           (*it).handle_destruction_time_ + this->status_list_timeout_ < rtt_rosclock::host_now()){
          it = this->status_list_.erase(it);
        } else {
          ++it;
        }
      }

      // Publish the status
      action_bridge_.statusOutput().write(status_array);
    }

}



#endif // ifndef __RTT_ACTION_SERVER_H