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""" |
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parse simple structures from an xml tree |
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We only support a subset of features but should be enough |
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for custom structures |
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""" |
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from lxml import etree |
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from lxml import objectify |
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from IPython import embed |
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from opcua.ua.ua_binary import Primitives |
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def get_default_value(uatype): |
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if uatype in ("String"): |
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return "None" |
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elif uatype == "Guid": |
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return "uuid.uuid4()" |
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elif uatype in ("ByteString", "CharArray", "Char"): |
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return None |
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elif uatype in ("Boolean"): |
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return "True" |
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elif uatype in ("DateTime"): |
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return "datetime.utcnow()" |
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elif uatype in ("Int8", "Int16", "Int32", "Int64", "UInt8", "UInt16", "UInt32", "UInt64", "Double", "Float", "Byte", "SByte"): |
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return 0 |
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else: |
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return "ua." + uatype + "()" |
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class Struct(object): |
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def __init__(self, name): |
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self.name = name |
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self.fields = [] |
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self.code = "" |
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def get_code(self): |
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self._make_constructor() |
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self._make_from_binary() |
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self._make_to_binary() |
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return self.code |
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def _make_constructor(self): |
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self.code = """ |
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class {0}(object): |
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''' |
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{0} autogenerated from xml |
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''' |
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def __init__(self, data=None): |
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if data is not None: |
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self._binary_init(data) |
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return |
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""".format(self.name) |
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for field in self.fields: |
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self.code += " self.{} = {}\n".format(field.name, field.value) |
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def _make_from_binary(self): |
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self.code += ''' |
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@staticmethod |
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def from_binary(data): |
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return {}(data=data) |
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def _binary_init(self, data): |
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'''.format(self.name) |
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for field in self.fields: |
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if hasattr(Primitives, field.uatype): |
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if field.array: |
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self.code += ' self.{} = ua.ua_binary.Primitives.{}.unpack_array(data)\n'.format(field.name, field.uatype) |
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else: |
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self.code += ' self.{} = ua.ua_binary.Primitives.{}.unpack(data)\n'.format(field.name, field.uatype) |
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else: |
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if field.array: |
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self.code += ''' |
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length = ua.ua_binary.Primitives.Int32.unpack(data) |
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if length != -1: |
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self.{0} = [ua.{1}.from_binary(data) for _ in range(length)] |
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'''.format(field.name, field.uatype) |
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else: |
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self.code += " self.{} = ua.{}.from_binary(data)\n".format(field.name, field.uatype) |
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def _make_to_binary(self): |
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self.code += ''' |
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def to_binary(self): |
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packet = [] |
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''' |
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for field in self.fields: |
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if hasattr(Primitives, field.uatype): |
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if field.array: |
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self.code += ' packet.append(ua.ua_binary.Primitives.{}.pack_array(self.{}))\n'.format(field.uatype, field.name) |
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else: |
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self.code += ' packet.append(ua.ua_binary.Primitives.{}.pack(self.{}))\n'.format(field.uatype, field.name) |
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else: |
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if field.array: |
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self.code += ''' |
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if self.{0} is None: |
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packet.append(ua.ua_binary.Primitives.Int32.pack(-1)) |
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else: |
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packet.append(ua.ua_binary.Primitives.Int32.pack(len(self.{0}))) |
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for element in self.{0}: |
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packet.append(element.to_binary()) |
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'''.format(field.name, field.uatype) |
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else: |
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self.code += " packet.append(self.{}.to_binary())\n".format(field.name) |
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self.code += ' return b"".join(packet)' |
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109
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class Field(object): |
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def __init__(self, name): |
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self.name = name |
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self.uatype = None |
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self.value = None |
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self.array = False |
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117
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class StructGenerator(object): |
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def __init__(self, path, output): |
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self.path = path |
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self.output = output |
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self.model = [] |
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def generate(self): |
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parser = etree.XMLParser(remove_blank_text=True, ns_clean=True) |
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root = etree.parse(self.path, parser) |
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embed() |
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for child in root.iter(): |
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embed() |
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def _make_model(self): |
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obj = objectify.parse(self.path) |
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root = obj.getroot() |
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for child in root.iter("{*}StructuredType"): |
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struct = Struct(child.get("Name")) |
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array = False |
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for xmlfield in child.iter("{*}Field"): |
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name = xmlfield.get("Name") |
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if name.startswith("NoOf"): |
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array = True |
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continue |
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field = Field(name) |
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uatype = xmlfield.get("TypeName") |
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if uatype.startswith("opc"): |
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field.uatype = uatype[4:] |
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else: |
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field.uatype = uatype[3:] |
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field.value = get_default_value(field.uatype) |
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if array: |
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field.array = True |
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field.value = [] |
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array = False |
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struct.fields.append(field) |
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self.model.append(struct) |
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156
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def run(self): |
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self._make_model() |
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self._file = open(self.output, "wt") |
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self._make_header() |
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for struct in self.model: |
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self._file.write(struct.get_code()) |
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self._file.close() |
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164
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def get_structures(self): |
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self._make_model() |
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ld = {} |
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for struct in self.model: |
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exec(struct.get_code(), ld) |
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return ld |
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170
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171
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172
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173
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def _make_header(self): |
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self._file.write(""" |
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175
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''' |
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176
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THIS FILE IS AUTOGENERATED, DO NOT EDIT!!! |
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''' |
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178
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179
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from datetime import datetime |
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180
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import uuid |
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181
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182
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from opcua import ua |
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183
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184
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185
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""") |
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186
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187
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188
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189
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190
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if __name__ == "__main__": |
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191
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import sys |
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192
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sys.path.insert(0, ".") # necessary for import in current dir |
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193
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194
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xmlpath = "/home/olivier/python-opcua/schemas/example.bsd" |
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195
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c = StructGenerator(xmlpath, "structures.py") |
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196
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c.run() |
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197
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import structures as s |
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198
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199
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200
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#sts = c.get_structures() |
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201
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embed() |
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202
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FreeOpcUa /
python-opcua
