graspObject.cpp

Go to the documentation of this file.

#include "rail_grasping/graspObject.h"

using namespace std;

graspObject::graspObject() :
    acPickup("jaco_arm/manipulation/pickup"),
    acGrasp("jaco_arm/manipulation/grasp"),
    acJointTrajectory("jaco_arm/joint_velocity_controller/trajectory"),
    acMoveArm("carl_moveit_wrapper/move_to_pose")
{
  ROS_INFO("Starting rail grasping...");
  graspTransform.setOrigin(tf::Vector3(0.0, 0.0, 0.0));
  graspTransform.setRotation(tf::Quaternion(0, 0, 0, 1));

  cartesianCommandPub = n.advertise<wpi_jaco_msgs::CartesianCommand>("jaco_arm/cartesian_cmd", 1);

  armJointSubscriber = n.subscribe("jaco_arm/joint_states", 1, &graspObject::armJointStatesCallback, this);

  IKClient = n.serviceClient<carl_moveit::CallIK>("carl_moveit_wrapper/call_ik");
  cartesianPositionClient = n.serviceClient<wpi_jaco_msgs::GetCartesianPosition>("jaco_arm/get_cartesian_position");
  cartesianPathClient = n.serviceClient<carl_moveit::CartesianPath>("carl_moveit_wrapper/cartesian_path");

  jointNamesSet = false;
  armJointPos.resize(NUM_JACO_JOINTS);
  armJointNames.resize(NUM_JACO_JOINTS);

  while (!acPickup.waitForServer(ros::Duration(5.0)) &&
      !acGrasp.waitForServer(ros::Duration(5.0)) &&
      !acJointTrajectory.waitForServer(ros::Duration(5.0)))
  {
    ROS_INFO("Waiting for grasp, pickup, and arm trajectory action servers...");
  }

  requestGraspServer = n.advertiseService("rail_grasping/request_grasp", &graspObject::requestGrasp, this);
  requestReleaseServer = n.advertiseService("rail_grasping/request_release", &graspObject::requestRelease, this);

  ROS_INFO("Rail grasping started.");
}

void graspObject::armJointStatesCallback(const sensor_msgs::JointState &msg)
{
  for (unsigned int i = 0; i < NUM_JACO_JOINTS; i++)
  {
    armJointPos[i] = msg.position[i];
  }

  if (!jointNamesSet)
  {
    for (unsigned int i = 0; i < NUM_JACO_JOINTS; i++)
    {
      armJointNames[i] = msg.name[i];
    }
    jointNamesSet = true;
  }
}

bool graspObject::requestRelease(rail_grasping::RequestGrasp::Request &req, rail_grasping::RequestGrasp::Response &res)
{
  ROS_INFO("Received new release request...");
  //set release position
  /*
  graspTransform.setOrigin(tf::Vector3(req.graspPose.position.x, req.graspPose.position.y, req.graspPose.position.z));
  graspTransform.setRotation(tf::Quaternion(req.graspPose.orientation.x, req.graspPose.orientation.y, req.graspPose.orientation.z, req.graspPose.orientation.w));
  tfBroadcaster.sendTransform(tf::StampedTransform(graspTransform, ros::Time::now(), "base_footprint", "grasp_frame"));
  
  ros::Duration(1).sleep();
  
  //*********** Align gripper on approach angle ***********
  //Calculate pose on approach angle
  geometry_msgs::PoseStamped approachPose;
  geometry_msgs::PoseStamped poseOut;
  //approachPose.header.stamp = ros::Time::now();
  approachPose.header.frame_id = "grasp_frame";
  approachPose.pose.position.x = 0.0;
  approachPose.pose.position.y = 0.0;
  //approachPose.pose.position.z = 0.1; //note: disabled to see how close the arm will plan to
  approachPose.pose.position.z = 0.0;
  approachPose.pose.orientation.x = 0.0;
  approachPose.pose.orientation.y = 0.0;
  approachPose.pose.orientation.z = 0.0;
  approachPose.pose.orientation.w = 1.0;
  
  //adjustment to put approach pose from centered at fingers to jaco_link_hand
  approachPose.pose.position.z += .19;
  
  tfListener.transformPose("base_footprint", approachPose, poseOut);
  
  poseOut.pose.position.z += .05;
  */

  //Send goal to move arm service

  //try
  geometry_msgs::Pose releasePose = req.graspPose;
  releasePose.position.z += .05;
  //end try

  bool success = false;
  int counter = 0;
  while (!success)
  {
    ROS_INFO("Moving to approach angle...");
    carl_moveit::MoveToPoseGoal movePoseGoal;
    movePoseGoal.pose = releasePose;
    switch (counter)
    {
      case 0:
        movePoseGoal.pose.position.x += .005;
        break;
      case 1:
        movePoseGoal.pose.position.x -= .005;
        break;
      case 2:
        movePoseGoal.pose.position.y += .005;
        break;
      case 3:
        movePoseGoal.pose.position.y -= .005;
        break;
      case 4:
        movePoseGoal.pose.position.z += .005;
        break;
      case 5:
        movePoseGoal.pose.position.z -= .005;
        break;
      case 6:
        movePoseGoal.pose.position.x += .005;
        movePoseGoal.pose.position.y += .005;
        break;
      case 7:
        movePoseGoal.pose.position.x += .005;
        movePoseGoal.pose.position.y -= .005;
        break;
      case 8:
        movePoseGoal.pose.position.x -= .005;
        movePoseGoal.pose.position.y += .005;
        break;
      case 9:
        movePoseGoal.pose.position.x -= .005;
        movePoseGoal.pose.position.y -= .005;
        break;
    }
    acMoveArm.sendGoal(movePoseGoal);
    ROS_INFO("Approach angle arm move initiated.");
    acMoveArm.waitForResult(ros::Duration(20.0));
    carl_moveit::MoveToPoseResultConstPtr movePoseResult = acMoveArm.getResult();

    counter++;

    res.earlyFailureDetected = !movePoseResult->success;
    if (!res.earlyFailureDetected)
    {
      success = true;
      res.result = true;
    }
    else if (res.earlyFailureDetected && counter > 9)
    {
      ROS_INFO("Detected failure on moving to approach angle.");
      res.result = false;
      return false;
    }
  }

  wpi_jaco_msgs::GetCartesianPosition::Request ikReq;
  wpi_jaco_msgs::GetCartesianPosition::Response ikRes;
  cartesianPositionClient.call(ikReq, ikRes);

  wpi_jaco_msgs::CartesianCommand cartesianCmd;
  cartesianCmd.position = true;
  cartesianCmd.armCommand = true;
  cartesianCmd.fingerCommand = false;
  cartesianCmd.repeat = false;
  cartesianCmd.arm = ikRes.pos;
  cartesianCmd.arm.linear.z -= .05;
  cartesianCommandPub.publish(cartesianCmd);

  ros::Duration(5.0).sleep(); //wait for cartesian trajectory execution

  //Open gripper
  ROS_INFO("Fully opening gripper...");
  wpi_jaco_msgs::ExecuteGraspGoal openGripperGoal;
  openGripperGoal.closeGripper = false;
  openGripperGoal.limitFingerVelocity = false;
  acGrasp.sendGoal(openGripperGoal);
  acGrasp.waitForResult(ros::Duration(5.0));
  ROS_INFO("Gripper opened.");

  //*********** lift hand ***********
  ROS_INFO("Lifting hand...");
  wpi_jaco_msgs::ExecutePickupGoal pickupGoal;
  pickupGoal.limitFingerVelocity = false;
  pickupGoal.setLiftVelocity = false;
  acPickup.sendGoal(pickupGoal);
  acPickup.waitForResult(ros::Duration(10));
  ROS_INFO("hand lifting complete.");
}

bool graspObject::requestGrasp(rail_grasping::RequestGrasp::Request &req, rail_grasping::RequestGrasp::Response &res)
{
  ROS_INFO("Received new grasp request...");
  //set new grasp position
  graspTransform.setOrigin(tf::Vector3(req.graspPose.position.x, req.graspPose.position.y, req.graspPose.position.z));
  graspTransform.setRotation(tf::Quaternion(req.graspPose.orientation.x, req.graspPose.orientation.y, req.graspPose.orientation.z, req.graspPose.orientation.w));
  tfBroadcaster.sendTransform(tf::StampedTransform(graspTransform, ros::Time::now(), "base_footprint", "grasp_frame"));

  ros::Duration(1).sleep();

  bool earlyFailureDetected;
  res.result = executeGrasp(&earlyFailureDetected);
  res.earlyFailureDetected = earlyFailureDetected;

  return true;
}

bool graspObject::executeGrasp(bool *earlyFailureFlag)
{
  ROS_INFO("\nGrasp execution started");

  //Open gripper
  ROS_INFO("Fully opening gripper...");
  wpi_jaco_msgs::ExecuteGraspGoal openGripperGoal;
  openGripperGoal.closeGripper = false;
  openGripperGoal.limitFingerVelocity = false;
  acGrasp.sendGoal(openGripperGoal);
  acGrasp.waitForResult(ros::Duration(5.0));
  ROS_INFO("Gripper opened.");

  //*********** Align gripper on approach angle ***********
  //Calculate pose on approach angle
  geometry_msgs::PoseStamped approachPose;
  geometry_msgs::PoseStamped poseOut;
  approachPose.header.frame_id = "grasp_frame";
  approachPose.pose.position.z = 0.1; //adjust this to increase/decrease distance of approach
  approachPose.pose.orientation.w = 1.0;

  //adjustment to put approach pose from centered at fingers to jaco_link_hand
  approachPose.pose.position.z += .19;

  tfListener.transformPose("base_footprint", approachPose, poseOut);

  //Send goal to move arm service
  ROS_INFO("Moving to approach angle...");
  carl_moveit::MoveToPoseGoal movePoseGoal;
  movePoseGoal.pose = poseOut.pose;
  acMoveArm.sendGoal(movePoseGoal);
  ROS_INFO("Approach angle arm move initiated.");
  acMoveArm.waitForResult(ros::Duration(20.0));
  carl_moveit::MoveToPoseResultConstPtr movePoseResult = acMoveArm.getResult();

  *earlyFailureFlag = !movePoseResult->success;
  if (*earlyFailureFlag)
  {
    ROS_INFO("Detected failure on moving to approach angle.");
    return false;
  }

  //Determine pickup pose
  carl_moveit::CartesianPath pathSrvObj;
  geometry_msgs::PoseStamped pickupPose;
  geometry_msgs::PoseStamped pickupPoseOut;
  pickupPoseOut.header.frame_id = "base_footprint";
  pickupPose.header.frame_id = "grasp_frame";
  pickupPose.pose.orientation.w = 1.0;

  //adjustment to put approach pose from centered at fingers to jaco_link_hand
  pickupPose.pose.position.z += .19;

  tfListener.transformPose("base_footprint", pickupPose, pickupPoseOut);

  tf::StampedTransform currentHandTransform;
  pathSrvObj.request.waypoints.push_back(pickupPoseOut.pose);
  pathSrvObj.request.avoidCollisions = false;

  if (!cartesianPathClient.call(pathSrvObj))
  {
    ROS_INFO("Failed to call cartesian path planner.");
    *earlyFailureFlag = true;
    return false;
  }

  //Close gripper
  ROS_INFO("Closing gripper...");
  wpi_jaco_msgs::ExecuteGraspGoal closeGripperGoal;
  closeGripperGoal.closeGripper = true;
  closeGripperGoal.limitFingerVelocity = false;
  acGrasp.sendGoal(closeGripperGoal);
  acGrasp.waitForResult(ros::Duration(5.0));
  ROS_INFO("Gripper closed.");

  //*********** lift object ***********
  /* Lift object using pickup action server instead, switch it out with this if the
   * Cartesian lift is not working consistantly
   */
  ROS_INFO("Lifting object...");
  carl_moveit::CartesianPathRequest pickupPathReq;
  carl_moveit::CartesianPathResponse pickupPathRes;
  tfListener.waitForTransform("jaco_link_hand", "base_footprint", ros::Time::now(), ros::Duration(1.0));
  tfListener.lookupTransform("base_footprint", "jaco_link_hand", ros::Time(0), currentHandTransform);
  geometry_msgs::Pose pickupPoseWaypoint;
  pickupPoseWaypoint.position.x = currentHandTransform.getOrigin().x();
  pickupPoseWaypoint.position.y = currentHandTransform.getOrigin().y();
  pickupPoseWaypoint.position.z = currentHandTransform.getOrigin().z() + .085;
  pickupPoseWaypoint.orientation.x = currentHandTransform.getRotation().x();
  pickupPoseWaypoint.orientation.y = currentHandTransform.getRotation().y();
  pickupPoseWaypoint.orientation.z = currentHandTransform.getRotation().z();
  pickupPoseWaypoint.orientation.w = currentHandTransform.getRotation().w();
  pickupPathReq.waypoints.push_back(pickupPoseWaypoint);
  pickupPathReq.avoidCollisions = false;

  if (!cartesianPathClient.call(pickupPathReq, pickupPathRes))
  {
    ROS_INFO("Failed to call cartesian path planner.");
    return false;
  }

  return true;
}

void graspObject::publishGraspFrame()
{
  tfBroadcaster.sendTransform(tf::StampedTransform(graspTransform, ros::Time::now(), "base_footprint", "grasp_frame"));
}

int main(int argc, char **argv)
{
  ros::init(argc, argv, "rail_grasping");

  graspObject go;

  ros::Rate loop_rate(30);
  while (ros::ok())
  {
    ros::spinOnce();
    go.publishGraspFrame();
    loop_rate.sleep();
  }

  return 0;
}