numpy_msg.py

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import rospy.numpy_msg

"""
The building numpy_msg has a bug - see https://github.com/ros/ros_comm/pull/743

This patches it
"""

_numpy_msg = rospy.numpy_msg.numpy_msg
_cached = {}
def numpy_msg(cls):
        if cls not in _cached:
                res = _numpy_msg(cls)
                _cached[cls] = res
        else:
                res = _cached[cls]

        return res

# patch the original for good measure
rospy.numpy_msg.numpy_msg = numpy_msg