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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 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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1 |
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elif uatype == "Guid": |
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return "uuid.uuid4()" |
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1 |
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elif uatype in ("ByteString", "CharArray", "Char"): |
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return None |
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1 |
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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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1 |
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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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1 |
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for field in self.fields: |
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1 |
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if hasattr(Primitives, field.uatype): |
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1 |
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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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73
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else: |
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1 |
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if field.array: |
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1 |
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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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80
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else: |
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81
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1 |
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self.code += " self.{} = ua.{}.from_binary(data)\n".format(field.name, field.uatype) |
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1 |
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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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86
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packet = [] |
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87
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''' |
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1 |
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for field in self.fields: |
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1 |
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if hasattr(Primitives, field.uatype): |
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1 |
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if field.array: |
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1 |
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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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92
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else: |
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1 |
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self.code += ' packet.append(ua.ua_binary.Primitives.{}.pack(self.{}))\n'.format(field.uatype, field.name) |
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94
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else: |
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1 |
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if field.array: |
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96
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1 |
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self.code += ''' |
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97
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if self.{0} is None: |
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98
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packet.append(ua.ua_binary.Primitives.Int32.pack(-1)) |
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99
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else: |
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100
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packet.append(ua.ua_binary.Primitives.Int32.pack(len(self.{0}))) |
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101
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for element in self.{0}: |
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102
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packet.append(element.to_binary()) |
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103
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'''.format(field.name, field.uatype) |
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104
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else: |
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105
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1 |
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self.code += " packet.append(self.{}.to_binary())\n".format(field.name) |
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106
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1 |
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self.code += ' return b"".join(packet)' |
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107
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108
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109
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1 |
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class Field(object): |
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110
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1 |
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def __init__(self, name): |
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111
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1 |
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self.name = name |
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112
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1 |
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self.uatype = None |
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113
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1 |
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self.value = None |
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114
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1 |
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self.array = False |
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115
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116
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117
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1 |
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class StructGenerator(object): |
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118
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1 |
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def __init__(self, path, output): |
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119
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1 |
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self.path = path |
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120
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1 |
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self.output = output |
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121
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1 |
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self.model = [] |
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122
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123
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1 |
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def _make_model(self): |
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124
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1 |
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obj = objectify.parse(self.path) |
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125
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1 |
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root = obj.getroot() |
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126
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1 |
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for child in root.iter("{*}StructuredType"): |
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127
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1 |
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struct = Struct(child.get("Name")) |
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128
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1 |
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array = False |
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129
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1 |
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for xmlfield in child.iter("{*}Field"): |
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130
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1 |
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name = xmlfield.get("Name") |
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131
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1 |
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if name.startswith("NoOf"): |
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132
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1 |
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array = True |
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133
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1 |
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continue |
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134
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1 |
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field = Field(name) |
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135
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1 |
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uatype = xmlfield.get("TypeName") |
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136
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1 |
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if uatype.startswith("opc"): |
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137
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1 |
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field.uatype = uatype[4:] |
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138
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else: |
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139
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1 |
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field.uatype = uatype[3:] |
|
140
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1 |
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field.value = get_default_value(field.uatype) |
|
141
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1 |
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if array: |
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142
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1 |
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field.array = True |
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143
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1 |
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field.value = [] |
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144
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1 |
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array = False |
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145
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1 |
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struct.fields.append(field) |
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146
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1 |
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self.model.append(struct) |
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147
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148
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1 |
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def run(self): |
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149
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1 |
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self._make_model() |
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150
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1 |
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self._file = open(self.output, "wt") |
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151
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1 |
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self._make_header() |
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152
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1 |
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for struct in self.model: |
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153
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1 |
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self._file.write(struct.get_code()) |
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154
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1 |
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self._file.close() |
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155
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156
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1 |
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def get_structures(self): |
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157
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self._make_model() |
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158
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ld = {} |
|
159
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for struct in self.model: |
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160
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exec(struct.get_code(), ld) |
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161
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return ld |
|
162
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163
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164
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165
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1 |
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def _make_header(self): |
|
166
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1 |
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self._file.write(""" |
|
167
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''' |
|
168
|
|
|
THIS FILE IS AUTOGENERATED, DO NOT EDIT!!! |
|
169
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''' |
|
170
|
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|
|
171
|
|
|
from datetime import datetime |
|
172
|
|
|
import uuid |
|
173
|
|
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|
|
174
|
|
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from opcua import ua |
|
175
|
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|
|
176
|
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|
|
177
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""") |
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178
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179
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|
180
|
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181
|
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182
|
1 |
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if __name__ == "__main__": |
|
183
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import sys |
|
184
|
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sys.path.insert(0, ".") # necessary for import in current dir |
|
185
|
|
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|
|
186
|
|
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xmlpath = "/home/olivier/python-opcua/schemas/example.bsd" |
|
187
|
|
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c = StructGenerator(xmlpath, "structures.py") |
|
188
|
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c.run() |
|
189
|
|
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import structures as s |
|
190
|
|
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|
|
191
|
|
|
|
|
192
|
|
|
#sts = c.get_structures() |
|
193
|
|
|
embed() |
|
194
|
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|
FreeOpcUa /
python-opcua
