advanced_controls.py

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# Copyright (c) 2011, Dirk Thomas, TU Darmstadt
# All rights reserved.
#
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# modification, are permitted provided that the following conditions
# are met:
#
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above
#     copyright notice, this list of conditions and the following
#     disclaimer in the documentation and/or other materials provided
#     with the distribution.
#   * Neither the name of the TU Darmstadt nor the names of its
#     contributors may be used to endorse or promote products derived
#     from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# POSSIBILITY OF SUCH DAMAGE.


import os
import rospy
import rospkg

from time import sleep

from qt_gui.plugin import Plugin
from python_qt_binding import loadUi

from QtWidgets import QMessageBox, QWidget
from QtGui import QIcon
from controller_manager_msgs.srv import ListControllers
from controller_manager_msgs.srv import SwitchController, LoadController
from sr_robot_msgs.srv import ChangeControlType
from sr_robot_msgs.msg import ControlType
from sr_utilities.hand_finder import HandFinder


class SrGuiAdvancedControls(Plugin):

    """
    A rosgui plugin for loading the different controllers
    """
    ICON_DIR = os.path.join(
        rospkg.RosPack().get_path('sr_visualization_icons'), 'icons')
    CONTROLLER_ON_ICON = QIcon(os.path.join(ICON_DIR, 'green.png'))
    CONTROLLER_OFF_ICON = QIcon(os.path.join(ICON_DIR, 'red.png'))

    def populate_controllers(self):

        self.hand_ids = []
        hand_joint_prefixes = []
        # mapping is always in global ns
        if rospy.has_param("/hand/mapping"):
            hand_mapping = rospy.get_param("/hand/mapping")
            for _, value in hand_mapping.items():
                # if prefix matches the mapping, add this hand
                # empty prefix means both hands
                if self._prefix in value:
                    self.hand_ids.append(value)
        else:
            self.hand_ids.append("")

        if rospy.has_param("/hand/joint_prefix"):
            hand_joint_prefix_mapping = rospy.get_param("/hand/joint_prefix")
            for _, value in hand_joint_prefix_mapping.items():
                # if prefix matches the mapping, add this hand
                # empty prefix means both hands
                if self._prefix in value:
                    hand_joint_prefixes.append(value)
            if len(hand_joint_prefixes) == 0:
                QMessageBox.warning(self._widget, "Warning",
                                    "No hand found with prefix :" + self._prefix)
                hand_joint_prefixes.append("")
        else:
            rospy.loginfo("no joint prefix found, not appending prefix")
            hand_joint_prefixes.append("")

        joints = ["ffj0", "ffj3", "ffj4",
                  "mfj0", "mfj3", "mfj4",
                  "rfj0", "rfj3", "rfj4",
                  "lfj0", "lfj3", "lfj4", "lfj5",
                  "thj1", "thj2", "thj3", "thj4", "thj5",
                  "wrj1", "wrj2"]
        self.controllers = {
            "effort": [
                "sh_{0}{1}_effort_controller".format(hand_joint_prefix, joint)
                for joint in joints for hand_joint_prefix in
                hand_joint_prefixes],
            "position": [
                "sh_{0}{1}_position_controller".format(hand_joint_prefix,
                                                       joint)
                for joint in joints for hand_joint_prefix in
                hand_joint_prefixes],
            "mixed": [
                "sh_{0}{1}_mixed_position_velocity_controller".format(
                    hand_joint_prefix, joint)
                for joint in joints for hand_joint_prefix in
                hand_joint_prefixes],
            "velocity": [
                "sh_{0}{1}_velocity_controller".format(
                    hand_joint_prefix, joint)
                for joint in joints for hand_joint_prefix in
                hand_joint_prefixes], "stop": []}

        self.managed_controllers = [
            cont for type_conts in self.controllers.itervalues()
            for cont in type_conts]

    def __init__(self, context):
        super(SrGuiAdvancedControls, self).__init__(context)
        self.setObjectName('SrGuiAdvancedControls')

        self._publisher = None

        self._widget = QWidget()

        ui_file = os.path.join(
            rospkg.RosPack().get_path('sr_gui_advanced_controls'), 'uis',
            'SrAdvancedControls.ui')
        loadUi(ui_file, self._widget)
        self._widget.setObjectName('SrAdvancedControlsUI')
        context.add_widget(self._widget)

        # setting the prefixes
        self._hand_finder = HandFinder()
        hand_parameters = self._hand_finder.get_hand_parameters()

        self._prefix = ""
        for hand in hand_parameters.mapping:
            self._widget.select_prefix.addItem(hand_parameters.mapping[hand])

        if not hand_parameters.mapping:
            rospy.logerr("No hand detected")
            QMessageBox.warning(
                self._widget, "warning", "No hand is detected")
        else:
            self._widget.select_prefix.setCurrentIndex(0)
            self._prefix = hand_parameters.mapping.values()[0]

        self._widget.select_prefix.currentIndexChanged['QString'].connect(
            self.prefix_selected)

        self.populate_controllers()

        # Setting the initial state of the controller buttons
        self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_mixed.setChecked(False)
        self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_effort.setChecked(False)
        self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_position.setChecked(False)
        self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_velocity.setChecked(False)

        # attaching the button press event to their actions
        self._widget.btn_stop.pressed.connect(self.on_stop_ctrl_clicked_)
        self._widget.btn_effort.pressed.connect(self.on_effort_ctrl_clicked_)
        self._widget.btn_position.pressed.connect(
            self.on_position_ctrl_clicked_)
        self._widget.btn_mixed.pressed.connect(self.on_mixed_ctrl_clicked_)
        self._widget.btn_velocity.pressed.connect(
            self.on_velocity_ctrl_clicked_)

        # check the correct control box, depending on PWM_CONTROL env variable
        if os.environ.get('PWM_CONTROL') in [None, '0']:
            self._widget.radioButtonTorque.setChecked(True)
            self._widget.radioButtonPWM.setChecked(False)
        else:
            self._widget.radioButtonTorque.setChecked(False)
            self._widget.radioButtonPWM.setChecked(True)

        self._widget.radioButtonTorque.toggled.connect(
            self.on_control_mode_radio_button_toggled_)
        self._widget.radioButtonPWM.toggled.connect(
            self.on_control_mode_radio_button_toggled_)

    def on_control_mode_radio_button_toggled_(self, checked):
        """
        Switch between FORCE, PWM modes
        We only react to the currently ON radio button event
        """
        if checked:
            change_type_msg = ChangeControlType()
            if self._widget.radioButtonTorque.isChecked():
                change_type_msg.control_type = ControlType.FORCE
                rospy.loginfo("Change Control mode to FORCE")
            else:
                change_type_msg.control_type = ControlType.PWM
                rospy.loginfo("Change Control mode to PWM")
            self.change_force_ctrl_type(change_type_msg)

    def on_stop_ctrl_clicked_(self):
        """
        Stop controller
        """
        self._widget.btn_stop.setEnabled(False)
        self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_mixed.setChecked(False)
        self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_effort.setChecked(False)
        self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_position.setChecked(False)
        self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
        self._widget.btn_velocity.setChecked(False)
        self.change_ctrl("stop")
        self._widget.btn_stop.setEnabled(True)

    def on_effort_ctrl_clicked_(self):
        """
        Effort controller selected
        """
        self._widget.btn_effort.setEnabled(False)
        if not self._widget.btn_effort.isChecked():
            self._widget.btn_effort.setIcon(self.CONTROLLER_ON_ICON)
            self._widget.btn_effort.setChecked(True)
            self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_position.setChecked(False)
            self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_mixed.setChecked(False)
            self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_velocity.setChecked(False)
            rospy.loginfo("Effort checked: " + str(
                self._widget.btn_effort.isChecked()))
            self.change_ctrl("effort")
        else:
            self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_effort.setChecked(False)
            rospy.loginfo("Effort checked: " + str(
                self._widget.btn_effort.isChecked()))
            self.change_ctrl("stop")
        self._widget.btn_effort.setEnabled(True)

    def on_position_ctrl_clicked_(self):
        """
        Position controller selected
        """
        self._widget.btn_position.setEnabled(False)
        if not self._widget.btn_position.isChecked():
            self._widget.btn_position.setIcon(self.CONTROLLER_ON_ICON)
            self._widget.btn_position.setChecked(True)
            self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_effort.setChecked(False)
            self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_mixed.setChecked(False)
            self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_velocity.setChecked(False)
            rospy.loginfo("Position checked: " +
                          str(self._widget.btn_position.isChecked()))
            self.change_ctrl("position")
        else:
            self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_position.setChecked(False)
            rospy.loginfo("Position checked: " +
                          str(self._widget.btn_position.isChecked()))
            self.change_ctrl("stop")
        self._widget.btn_position.setEnabled(True)

    def on_mixed_ctrl_clicked_(self):
        """
        Mixed controller selected
        """
        self._widget.btn_mixed.setEnabled(False)
        if not self._widget.btn_mixed.isChecked():
            self._widget.btn_mixed.setIcon(self.CONTROLLER_ON_ICON)
            self._widget.btn_mixed.setChecked(True)
            self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_effort.setChecked(False)
            self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_position.setChecked(False)
            self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_velocity.setChecked(False)
            rospy.loginfo("Mixed checked: " +
                          str(self._widget.btn_mixed.isChecked()))
            self.change_ctrl("mixed")
        else:
            self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_mixed.setChecked(False)
            rospy.loginfo("Mixed checked: " +
                          str(self._widget.btn_mixed.isChecked()))
            self.change_ctrl("stop")
        self._widget.btn_mixed.setEnabled(True)

    def on_velocity_ctrl_clicked_(self):
        """
        Velocity controller selected
        """
        self._widget.btn_velocity.setEnabled(False)
        if not self._widget.btn_velocity.isChecked():
            self._widget.btn_velocity.setIcon(self.CONTROLLER_ON_ICON)
            self._widget.btn_velocity.setChecked(True)
            self._widget.btn_effort.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_effort.setChecked(False)
            self._widget.btn_position.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_position.setChecked(False)
            self._widget.btn_mixed.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_mixed.setChecked(False)
            rospy.loginfo("Velocity checked: " +
                          str(self._widget.btn_velocity.isChecked()))
            self.change_ctrl("velocity")
        else:
            self._widget.btn_velocity.setIcon(self.CONTROLLER_OFF_ICON)
            self._widget.btn_velocity.setChecked(False)
            rospy.loginfo("Velocity checked: " +
                          str(self._widget.btn_velocity.isChecked()))
            self.change_ctrl("stop")
        self._widget.btn_velocity.setEnabled(True)

    def change_ctrl(self, controller):
        """
        Switch the current controller
        """
        success = True
        list_controllers = rospy.ServiceProxy(
            'controller_manager/list_controllers', ListControllers)
        try:
            resp1 = list_controllers()
        except rospy.ServiceException:
            success = False

        if success:
            controllers_to_stop = [
                c.name for c in resp1.controller
                if c.state == "running" and c.name in self.managed_controllers]
            all_loaded_controllers = [c.name for c in resp1.controller]

            controllers_to_start = self.controllers[controller]

            load_controllers = None
            for load_control in controllers_to_start:
                if load_control not in all_loaded_controllers:
                    try:
                        load_controllers = rospy.ServiceProxy(
                            'controller_manager/load_controller',
                            LoadController)
                        resp1 = load_controllers(load_control)
                    except rospy.ServiceException:
                        success = False
                    if not resp1.ok:
                        success = False

            switch_controllers = rospy.ServiceProxy(
                'controller_manager/switch_controller', SwitchController)
            try:
                resp1 = switch_controllers(
                    controllers_to_start, controllers_to_stop,
                    SwitchController._request_class.BEST_EFFORT, False, 0)
            except rospy.ServiceException:
                success = False

            if not resp1.ok:
                success = False

        if not success:
            rospy.logwarn(
                "Failed to change some of the controllers. "
                "This is normal if this is not a 5 finger hand.")

    def change_force_ctrl_type(self, chng_type_msg):
        """
        Calls the service (sr_hand_robot/change_control_type) that allows to
        tell the driver (sr_robot_lib)
        which type of force control has to be sent to the motor:
            - torque demand (sr_robot_msgs::ControlType::FORCE)
            - PWM (sr_robot_msgs::ControlType::PWM)
        it will deactivate the Effort, Position, Mixed and Velocity buttons
        for 3 secs to allow hardware controllers to be updated
        """
        success = True
        for hand_id in self.hand_ids:
            srv_path = 'sr_hand_robot/' + hand_id + '/change_control_type'
            # remove double slash for empty hand_id
            srv_path.replace("//", "/")
            change_control_type = rospy.ServiceProxy(srv_path,
                                                     ChangeControlType)
            try:
                resp1 = change_control_type(chng_type_msg)
                if resp1.result.control_type != chng_type_msg.control_type:
                    success = False
            except rospy.ServiceException:
                success = False

        # Disable buttons for 3 secs until motors change their parameters
        self._widget.btn_effort.setEnabled(False)
        self._widget.btn_position.setEnabled(False)
        self._widget.btn_mixed.setEnabled(False)
        self._widget.btn_velocity.setEnabled(False)
        sleep(3)
        self._widget.btn_effort.setEnabled(True)
        self._widget.btn_position.setEnabled(True)
        self._widget.btn_mixed.setEnabled(True)
        self._widget.btn_velocity.setEnabled(True)

        if not success:
            QMessageBox.warning(self._widget, "Warning",
                                "Failed to change the control type.")

    def prefix_selected(self, prefix):
        self._prefix = prefix
        self.populate_controllers()

    def _unregisterPublisher(self):
        if self._publisher is not None:
            self._publisher.unregister()
            self._publisher = None

    def shutdown_plugin(self):
        self._unregisterPublisher()

    def save_settings(self, global_settings, perspective_settings):
        pass

    def restore_settings(self, global_settings, perspective_settings):
        pass