async def data_type_to_variant_type(dtype_node):
"""
Given a Node datatype, find out the variant type to encode
data. This is not exactly straightforward...
"""
base = await get_base_data_type(dtype_node)
if base.nodeid.Identifier != 29:
return ua.VariantType(base.nodeid.Identifier)
# we have an enumeration, value is a Int32
return ua.VariantType.Int32
def _is_expected_variant_type(self, value, attval, node):
vtype = attval.value.Value.VariantType
if vtype == ua.VariantType.Null:
# Node had a null value, many nodes are initialized with that value
# we should check what the real type is
dtype = node.attributes[ua.AttributeIds.DataType].value.Value.Value
if dtype.NamespaceIndex == 0 and dtype.Identifier <= 25:
vtype = ua.VariantType(dtype.Identifier)
else:
# FIXME: should find the correct variant type given data type but
# this is a bit complicaed so trusting the first write
return True
if value.Value.VariantType == vtype:
return True
_logger.critical(
"Write refused: Variant: %s with type %s does not have expected type: %s",
value.Value, value.Value.VariantType,
attval.value.Value.VariantType)
return False
def _is_expected_variant_type(self, value: ua.DataValue,
attval: AttributeValue,
node: NodeData) -> bool:
vtype = attval.value.Value.VariantType # FIXME Type hinting reveals that it is possible that Value (Optional) is None which would raise an exception
if vtype == ua.VariantType.Null:
# Node had a null value, many nodes are initialized with that value
# we should check what the real type is
dtype = node.attributes[ua.AttributeIds.DataType].value.Value.Value
if dtype.NamespaceIndex == 0 and dtype.Identifier <= 25:
vtype = ua.VariantType(dtype.Identifier)
else:
# FIXME: should find the correct variant type given data type but
# this is a bit complicaed so trusting the first write
return True
if value.Value.VariantType == vtype:
return True
_logger.critical(
"Write refused: Variant: %s with type %s does not have expected type: %s",
value.Value, value.Value.VariantType,
attval.value.Value.VariantType)
return False