/
robot_web_server.py
executable file
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robot_web_server.py
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#! /usr/bin/env python
##############################################################################################################
# This example is for streaming video and controlling the GoPiGo from a web browser
# http://www.dexterindustries.com/GoPiGo/
# History
# ------------------------------------------------
# Author Date Comments
# Karan 24 July 14 Initial Authoring
'''
## License
GoPiGo for the Raspberry Pi: an open source robotics platform for the Raspberry Pi.
Copyright (C) 2017 Dexter Industries
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/gpl-3.0.txt>.
'''
#
# This example is derived from the Dawn Robotics Raspberry Pi Camera Bot
# https://bitbucket.org/DawnRobotics/raspberry_pi_camera_bot
############################################################################################################
# Copyright (c) 2014, Dawn Robotics Ltd
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# 2. 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.
# 3. Neither the name of the Dawn Robotics Ltd 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 "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 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, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from __future__ import print_function
from __future__ import division
from builtins import input
# the above lines are meant for Python3 compatibility.
# they force the use of Python3 functionality for print(),
# the integer division and input()
# mind your parentheses!
import logging
LOG_FILENAME = "/tmp/robot_web_server_log.txt"
file_location = "/home/pi/Dexter/GoPiGo/Software/Python/Examples/Browser_Streaming_Robot/www/"
logging.basicConfig( filename=LOG_FILENAME, level=logging.DEBUG )
# Also log to stdout
consoleHandler = logging.StreamHandler()
consoleHandler.setLevel( logging.DEBUG )
logging.getLogger( "" ).addHandler( consoleHandler )
import os.path
import math
import time
import signal
import tornado.httpserver
import tornado.ioloop
import tornado.web
import tornado.escape
import sockjs.tornado
import threading
import camera_streamer
import robot_controller
import json
import gopigo
import subprocess
import sys
try:
import Queue as queue
except:
import queue
robot = None
cameraStreamer = None
scriptPath = os.path.dirname( __file__ )
webPath = os.path.abspath( file_location)
print (webPath)
robotConnectionResultQueue = queue.Queue()
isClosing = False
#---------------------------------------------------------------------------------------------------
def createRobot(resultQueue ):
r = robot_controller.RobotController( )
resultQueue.put( r )
#---------------------------------------------------------------------------------------------------
class ConnectionHandler( sockjs.tornado.SockJSConnection ):
#-----------------------------------------------------------------------------------------------
def on_open( self, info ):
pass
#-----------------------------------------------------------------------------------------------
def on_message( self, message ):
try:
message = str( message )
except Exception:
logging.warning( "Got a message that couldn't be converted to a string" )
return
if isinstance( message, str ):
lineData = message.split( " " )
if len( lineData ) > 0:
if lineData[ 0 ] == "Centre":
if robot != None:
robot.centreNeck()
elif lineData[ 0 ] == "StartStreaming":
cameraStreamer.startStreaming()
elif lineData[ 0 ] == "Shutdown":
cameraStreamer.stopStreaming()
gopigo.stop()
robot.disconnect()
sys.exit()
elif lineData[ 0 ] == "Move" and len( lineData ) >= 3:
motorJoystickX, motorJoystickY = \
self.extractJoystickData( lineData[ 1 ], lineData[ 2 ] )
if robot != None:
robot.setMotorJoystickPos( motorJoystickX, motorJoystickY )
elif lineData[ 0 ] == "PanTilt" and len( lineData ) >= 3:
neckJoystickX, neckJoystickY = \
self.extractJoystickData( lineData[ 1 ], lineData[ 2 ] )
if robot != None:
robot.setNeckJoystickPos( neckJoystickX, neckJoystickY )
#-----------------------------------------------------------------------------------------------
def on_close( self ):
logging.info( "SockJS connection closed" )
def extractJoystickData( self, dataX, dataY ):
joystickX = 0.0
joystickY = 0.0
try:
joystickX = float( dataX )
except Exception:
pass
try:
joystickY = float( dataY )
except Exception:
pass
return ( joystickX, joystickY )
#---------------------------------------------------------------------------------------------------
class MainHandler( tornado.web.RequestHandler ):
#------------------------------------------------------------------------------------------------
def get( self ):
self.render( webPath + "/index.html" )
#---------------------------------------------------------------------------------------------------
def robotUpdate():
global robot
global isClosing
if isClosing:
tornado.ioloop.IOLoop.instance().stop()
return
if robot == None:
if not robotConnectionResultQueue.empty():
robot = robotConnectionResultQueue.get()
else:
robot.update()
#---------------------------------------------------------------------------------------------------
def signalHandler( signum, frame ):
if signum in [ signal.SIGINT, signal.SIGTERM ]:
global isClosing
isClosing = True
#---------------------------------------------------------------------------------------------------
if __name__ == "__main__":
signal.signal( signal.SIGINT, signalHandler )
signal.signal( signal.SIGTERM, signalHandler )
# Create the configuration for the web server
router = sockjs.tornado.SockJSRouter(
ConnectionHandler, '/robot_control' )
application = tornado.web.Application( router.urls + [
( r"/", MainHandler ),
( r"/(.*)", tornado.web.StaticFileHandler, { "path": webPath } ),
( r"/css/(.*)", tornado.web.StaticFileHandler, { "path": webPath + "/css" } ),
( r"/css/images/(.*)", tornado.web.StaticFileHandler, { "path": webPath + "/css/images" } ),
( r"/images/(.*)", tornado.web.StaticFileHandler, { "path": webPath + "/images" } ),
( r"/js/(.*)", tornado.web.StaticFileHandler, { "path": webPath + "/js" } ) ] )
#( r"/(.*)", tornado.web.StaticFileHandler, {"path": scriptPath + "/www" } ) ] \
# Create a camera streamer
cameraStreamer = camera_streamer.CameraStreamer()
# Start connecting to the robot asyncronously
robotConnectionThread = threading.Thread( target=createRobot,
args=[ robotConnectionResultQueue ] )
#args=[ robotConfig, robotConnectionResultQueue ] )
robotConnectionThread.start()
# Now start the web server
logging.info( "Starting web server..." )
http_server = tornado.httpserver.HTTPServer( application )
#The port number on which the robot control works, change in line 105 in www/index.html too
http_server.listen( 98 )
robotPeriodicCallback = tornado.ioloop.PeriodicCallback(
robotUpdate, 100)
robotPeriodicCallback.start()
cameraStreamerPeriodicCallback = tornado.ioloop.PeriodicCallback(
cameraStreamer.update, 1000)
cameraStreamerPeriodicCallback.start()
tornado.ioloop.IOLoop.instance().start()
# Shut down code
robotConnectionThread.join()
if robot != None:
robot.disconnect()
else:
if not robotConnectionResultQueue.empty():
robot = robotConnectionResultQueue.get()
robot.disconnect()
cameraStreamer.stopStreaming()