How to handle callbacks #205

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1. bcaller commented on Sep 25, 2019

   

   bcaller

   on Sep 25, 2019

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   Hello!
   Please can you give some example code to clarify what behaviour you're expecting as I'm not sure I fully understand the question.

   ❤️React with ❤️1Reacted by KevinHock
2. sabazahra commented on Sep 25, 2019

   

   sabazahra

   on Sep 25, 2019

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   class MyData:
   def init(self):
   self.a = None
   self.b = None
   self.x = None
   self.y = None
   def a_callback(self, msg):
   self.a = msg
   def b_callback(self, msg):
   self.b = msg
   def get_x(self):
   self.x = self.a +self.b
   def talker(self):
   pub = rospy.Publisher('C', Float64MultiArray, queue_size=10)
   rospy.init_node('talker', anonymous=True)
   rate = rospy.Rate(10) # 10hz
   while not rospy.is_shutdown():
   pub.publish(self.x)
   rate.sleep()
   if name == 'main':
   rospy.init_node('listener')
   mydata = MyData()
   rospy.Subscriber('a', Float64MultiArray , mydata.a_callback)
   mydata.get_x()
   mydata.talker()

   The above statement that is bold uses callback (a_callback) but the 'msg' in callback does not gets tainted at all giving us no vulnerability as a result but it give vulnerability. My source is supposed to be rospy.Subscriber and sink is rospy.Publisher . I hope I made it a little clear.