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1
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""" |
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2
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from a list of nodes in the address space, build an XML file |
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format is the one from opc-ua specification |
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4
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""" |
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import logging |
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from collections import OrderedDict |
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import xml.etree.ElementTree as Et |
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9
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from opcua import ua |
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10
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from opcua.ua import object_ids as o_ids # FIXME needed because the reverse look up isn't part of ObjectIds Class |
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11
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12
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class XmlExporter(object): |
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def __init__(self, server): |
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self.logger = logging.getLogger(__name__) |
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self.server = server |
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self.aliases = {} |
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node_set_attributes = OrderedDict() |
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node_set_attributes['xmlns:xsi'] = 'http://www.w3.org/2001/XMLSchema-instance' |
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node_set_attributes['xmlns:uax'] = 'http://opcfoundation.org/UA/2008/02/Types.xsd' |
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node_set_attributes['xmlns:xsd'] = 'http://www.w3.org/2001/XMLSchema' |
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node_set_attributes['xmlns'] = 'http://opcfoundation.org/UA/2011/03/UANodeSet.xsd' |
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self.etree = Et.ElementTree(Et.Element('UANodeSet', node_set_attributes)) |
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def build_etree(self, node_list, uris=None): |
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""" |
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Create an XML etree object from a list of nodes; custom namespace uris are optional |
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Args: |
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node_list: list of Node objects for export |
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uris: list of namespace uri strings |
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Returns: |
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""" |
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self.logger.info('Building XML etree') |
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# add all nodes in the list to the XML etree |
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for node in node_list: |
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self.node_to_etree(node) |
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# add all required aliases to the XML etree; must be done after nodes are added |
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self._add_alias_els() |
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if uris: |
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# add all namespace uris to the XML etree; must be done after aliases are added |
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self._add_namespace_uri_els(uris) |
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def write_xml(self, xmlpath): |
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""" |
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Write the XML etree in the exporter object to a file |
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Args: |
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xmlpath: string representing the path/file name |
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Returns: |
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""" |
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# try to write the XML etree to a file |
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self.logger.info('Exporting XML file to %s', xmlpath) |
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try: |
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self.etree.write(xmlpath, short_empty_elements=False) |
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except TypeError as e: # TODO where to find which exceptions etree.write() raises? |
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self.logger.error("Error writing XML to file: ", e) |
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def dump_etree(self): |
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""" |
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Dump etree to console for debugging |
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Returns: |
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""" |
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self.logger.info('Dumping XML etree to console') |
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Et.dump(self.etree) |
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def node_to_etree(self, node): |
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""" |
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Add the necessary XML sub elements to the etree for exporting the node |
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Args: |
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node: Node object which will be added to XML etree |
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Returns: |
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""" |
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node_class = node.get_node_class() |
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if node_class is ua.NodeClass.Object: |
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self.add_etree_object(node) |
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elif node_class is ua.NodeClass.ObjectType: |
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self.add_etree_object_type(node) |
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elif node_class is ua.NodeClass.Variable: |
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self.add_etree_variable(node) |
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elif node_class is ua.NodeClass.VariableType: |
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self.add_etree_variable_type(node) |
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elif node_class is ua.NodeClass.RefernceType: |
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self.add_etree_reference(node) |
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elif node_class is ua.NodeClass.DataType: |
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self.add_etree_datatype(node) |
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elif node_class is ua.NodeClass.Method: |
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self.add_etree_method(node) |
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else: |
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self.logger.info("Exporting node class not implemented: %s ", node_class) |
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View Code Duplication |
def add_etree_object(self, obj): |
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""" |
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Add a UA object element to the XML etree |
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""" |
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browsename = obj.get_browse_name().to_string() |
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nodeid = obj.nodeid.to_string() |
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displayname = obj.get_display_name().Text.decode(encoding='UTF8') |
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refs = obj.get_references() |
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obj_el = Et.SubElement(self.etree.getroot(), |
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'UAObject', |
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BrowseName=browsename, |
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NodeId=nodeid) |
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disp_el = Et.SubElement(obj_el, 'DisplayName', ) |
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disp_el.text = displayname |
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self._add_ref_els(obj_el, refs) |
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View Code Duplication |
def add_etree_object_type(self, obj): |
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""" |
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Add a UA object type element to the XML etree |
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""" |
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browsename = obj.get_browse_name().to_string() |
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nodeid = obj.nodeid.to_string() |
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displayname = obj.get_display_name().Text.decode(encoding='UTF8') |
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refs = obj.get_references() |
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obj_el = Et.SubElement(self.etree.getroot(), |
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'UAObject', |
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BrowseName=browsename, |
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NodeId=nodeid) |
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disp_el = Et.SubElement(obj_el, 'DisplayName', ) |
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disp_el.text = displayname |
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self._add_ref_els(obj_el, refs) |
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def add_etree_variable(self, obj): |
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""" |
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Add a UA variable element to the XML etree |
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""" |
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browsename = obj.get_browse_name().to_string() |
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datatype = o_ids.ObjectIdNames[obj.get_data_type().Identifier] |
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datatype_nodeid = obj.get_data_type().to_string() |
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nodeid = obj.nodeid.to_string() |
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parent = obj.get_parent().nodeid.to_string() |
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acccesslevel = str(obj.get_attribute(ua.AttributeIds.AccessLevel).Value.Value) |
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useraccesslevel = str(obj.get_attribute(ua.AttributeIds.UserAccessLevel).Value.Value) |
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symbolicname = None # TODO when to export this? |
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displayname = obj.get_display_name().Text.decode(encoding='UTF8') |
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value = str(obj.get_value()) |
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refs = obj.get_references() |
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var_el = Et.SubElement(self.etree.getroot(), |
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'UAVariable', |
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BrowseName=browsename, |
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DataType=datatype, |
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NodeId=nodeid, |
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ParentNodeId=parent, |
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AccessLevel=acccesslevel, |
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UserAccessLevel=useraccesslevel) |
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disp_el = Et.SubElement(var_el, 'DisplayName', ) |
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disp_el.text = displayname |
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self._add_ref_els(var_el, refs) |
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val_el = Et.SubElement(var_el, 'Value') |
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valx_el = Et.SubElement(val_el, 'uax:' + datatype) |
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valx_el.text = value |
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# add any references that get used to aliases dict; this gets handled later |
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self.aliases[datatype] = datatype_nodeid |
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View Code Duplication |
def add_etree_variable_type(self, obj): |
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""" |
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185
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Add a UA variable type element to the XML etree |
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""" |
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187
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browsename = obj.get_browse_name().to_string() |
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nodeid = obj.nodeid.to_string() |
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valuerank = None # TODO when to export this? |
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191
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displayname = obj.get_display_name().Text.decode(encoding='UTF8') |
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193
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refs = obj.get_references() |
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195
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obj_el = Et.SubElement(self.etree.getroot(), |
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'UAObject', |
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197
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BrowseName=browsename, |
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NodeId=nodeid) |
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200
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disp_el = Et.SubElement(obj_el, 'DisplayName', ) |
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disp_el.text = displayname |
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203
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self._add_ref_els(obj_el, refs) |
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205
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def add_etree_method(self, obj): |
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raise NotImplemented |
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207
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208
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def add_etree_reference(self, obj): |
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raise NotImplemented |
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View Code Duplication |
def add_etree_datatype(self, obj): |
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""" |
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213
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Add a UA data type element to the XML etree |
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""" |
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browsename = obj.get_browse_name().to_string() |
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nodeid = obj.nodeid.to_string() |
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displayname = obj.get_display_name().Text.decode(encoding='UTF8') |
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refs = obj.get_references() |
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obj_el = Et.SubElement(self.etree.getroot(), |
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'UAObject', |
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BrowseName=browsename, |
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NodeId=nodeid) |
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227
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disp_el = Et.SubElement(obj_el, 'DisplayName', ) |
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disp_el.text = displayname |
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230
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self._add_ref_els(obj_el, refs) |
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def _add_namespace_uri_els(self, uris): |
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nuris_el = Et.Element('NamespaceUris') |
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234
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235
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for uri in uris: |
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uri_el = Et.SubElement(nuris_el, 'Uri') |
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uri_el.text = uri |
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239
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self.etree.getroot().insert(0, nuris_el) |
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241
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def _add_alias_els(self): |
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aliases_el = Et.Element('Aliases') |
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244
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for k, v in self.aliases.items(): |
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ref_el = Et.SubElement(aliases_el, 'Alias', Alias=k) |
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ref_el.text = v |
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247
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248
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self.etree.getroot().insert(0, aliases_el) |
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250
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def _add_ref_els(self, parent_el, refs): |
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refs_el = Et.SubElement(parent_el, 'References') |
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252
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253
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for ref in refs: |
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254
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ref_name = o_ids.ObjectIdNames[ref.ReferenceTypeId.Identifier] |
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255
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ref_forward = str(ref.IsForward) |
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256
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ref_nodeid = ref.NodeId.to_string() |
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257
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ref_el = Et.SubElement(refs_el, 'Reference', IsForward=ref_forward, ReferenceType=ref_name) |
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258
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ref_el.text = ref_nodeid |
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260
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# add any references that gets used to aliases dict; this gets handled later |
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self.aliases[ref_name] = ref_nodeid |
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FreeOpcUa /
python-opcua
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