def extensionobject_from_binary(data):
"""
Convert binary-coded ExtensionObject to a Python object.
Returns an object, or None if TypeId is zero
"""
typeid = nodeid_from_binary(data)
Encoding = ord(data.read(1))
body = None
if Encoding & (1 << 0):
length = Primitives.Int32.unpack(data)
if length < 1:
body = Buffer(b"")
else:
body = data.copy(length)
data.skip(length)
if typeid.Identifier == 0:
return None
elif typeid in ua.extension_object_classes:
klass = ua.extension_object_classes[typeid]
if body is None:
raise UaError("parsing ExtensionObject {0} without data".format(
klass.__name__))
return from_binary(klass, body)
else:
e = ua.ExtensionObject()
e.TypeId = typeid
e.Encoding = Encoding
if body is not None:
e.Body = body.read(len(body))
return e
def __init__(self):
self.BooleanValue = True
self.SByteValue = 0
self.ByteValue = 0
self.Int16Value = 0
self.UInt16Value = 0
self.Int32Value = 0
self.UInt32Value = 0
self.Int64Value = 0
self.UInt64Value = 0
self.FloatValue = 0
self.DoubleValue = 0
self.StringValue = ''
self.DateTimeValue = datetime.utcnow()
self.GuidValue = uuid.uuid4()
self.ByteStringValue = b''
self.XmlElementValue = ua.XmlElement()
self.NodeIdValue = ua.NodeId()
self.ExpandedNodeIdValue = ua.ExpandedNodeId()
self.QualifiedNameValue = ua.QualifiedName()
self.LocalizedTextValue = ua.LocalizedText()
self.StatusCodeValue = ua.StatusCode()
self.VariantValue = ua.Variant()
self.EnumerationValue = 0
self.StructureValue = ua.ExtensionObject()
self.Number = ua.Variant()
self.Integer = ua.Variant()
self.UInteger = ua.Variant()
def test_unknown_extension_object(self):
obj = ua.ExtensionObject()
obj.Body = b'example of data in custom format'
obj.TypeId = ua.NodeId.from_string('ns=3;i=42')
data = ua.utils.Buffer(extensionobject_to_binary(obj))
obj2 = extensionobject_from_binary(data)
self.assertEqual(type(obj2), ua.ExtensionObject)
self.assertEqual(obj2.TypeId, obj.TypeId)
self.assertEqual(obj2.Body, b'example of data in custom format')
def test_extension_object(self):
obj = ua.ExtensionObject()
obj2 = ua.ExtensionObject.from_binary(ua.utils.Buffer(obj.to_binary()))
self.assertEqual(obj2.TypeId, obj2.TypeId)
self.assertEqual(obj2.Body, obj2.Body)
