Error Handling in Python with SUDS

Question

I have been trying to control a camera through a wsdl file using SUDS. I have got the code working but I want to place error handling into the script. I have tried different exceptions but am unable to get the script working. When I enter an invalid coordinate I get an error. The code I am using is below followed by the error I am recieving.

#!/home/build/Python-2.6.4/python

import suds
from suds.client import Client

####################################################################
#
#   Python SUDS Script that controls movement of Camera
#
####################################################################
#
#                    Absolute Move Function
#
####################################################################

def absoluteMove():

    # connects to WSDL file and stores location in variable 'client'
    client = Client('http://file.wsdl')

    # Create 'token' object to pass as an argument using the 'factory' namespace
    token = client.factory.create('ns4:ReferenceToken')
    print token

    # Create 'dest' object to pass as an argument and values passed to this object
    dest = client.factory.create('ns4:PTZVector')
    dest.PanTilt._x=400
    dest.PanTilt._y=0
    dest.Zoom._x=1
    print dest

    # Create 'speed' object to pass as an argument and values passed to this object
    speed = client.factory.create('ns4:PTZSpeed')
    speed.PanTilt._x=0
    speed.PanTilt._y=0
    speed.Zoom._x=1
    print speed

    # 'AbsoluteMove' method invoked passing in the new values entered in the above objects

    try:
        result = client.service.AbsoluteMove(token, dest, speed)
    except RuntimeError as detail:
        print 'Handling run-time error:', detail

    print "absoluteMove result ", result

result = absoluteMove() 

The error is below:

No handlers could be found for logger "suds.client"
Traceback (most recent call last):
  File "ptztest.py", line 48, in <module>
    if __name__ == '__main__': result = absoluteMove()    
  File "ptztest.py", line 42, in absoluteMove
    result = client.service.AbsoluteMove(token, dest, speed)
  File "build/bdist.linux-i686/egg/suds/client.py", line 537, in __call__
  File "build/bdist.linux-i686/egg/suds/client.py", line 597, in invoke
  File "build/bdist.linux-i686/egg/suds/client.py", line 632, in send
  File "build/bdist.linux-i686/egg/suds/client.py", line 683, in failed
  File "build/bdist.linux-i686/egg/suds/bindings/binding.py", line 235, in get_fault
suds.WebFault: Server raised fault: 'Error setting requested pan'

I am not sure which exception I should be using here. Does anyone know how to catch this error. The x coordinate with the value 400 is in degree's that is why the error happens.

Thanks

Okay I have found the solution. In SUDS if you enter:

faults=False

into the client definition, this catches faults and gives the reason why the fault happened. The line should read:

client = Client('http://file.wsdl', faults=False)

The post that I have marked as the correct answer also is able to catch that a problem has happened.

Thanks all

Answer 1

If you handled all exceptions and errors in your code and your code is working fine but still you are getting below message with your correct output.

Msg : "No handlers could be found for logger suds.client "

Then a simple solution is to add this line

logging.getLogger('suds.client').setLevel(logging.CRITICAL)

in yourclient.py file just after all import statement.

Answer 2

If you want to catch that exception you should put

try:
    result = client.service.AbsoluteMove(token, dest, speed)
except suds.WebFault as detail:
    ...