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from opcua import ua |
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from opcua import Client |
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from opcua import Node |
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class UaClient(object): |
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""" |
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OPC-Ua client specialized for the need of GUI client |
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return exactly whant GUI needs, no customization possible |
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""" |
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def __init__(self): |
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self.client = None |
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self._connected = False |
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self._datachange_sub = None |
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self._event_sub = None |
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self._subs_dc = {} |
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self._subs_ev = {} |
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def connect(self, uri): |
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self.disconnect() |
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print("Connecting to ", uri) |
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self.client = Client(uri) |
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self.client.connect() |
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self._connected = True |
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def disconnect(self): |
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if self._connected: |
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print("Disconnecting from server") |
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self._subs_dc = {} |
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self._subs_ev = {} |
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self._connected = False |
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self._subscription = None |
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self.client.disconnect() |
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self.client = None |
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def subscribe_datachange(self, node, handler): |
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if not self._datachange_sub: |
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self._datachange_sub = self.client.create_subscription(500, handler) |
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handle = self._datachange_sub.subscribe_data_change(node) |
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self._subs_dc[node.nodeid] = handle |
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return handle |
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def unsubscribe_datachange(self, node): |
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self._datachange_sub.unsubscribe(self._subs_dc[node.nodeid]) |
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def subscribe_events(self, node, handler): |
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if not self._event_sub: |
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print("subscirbing with handler: ", handler, dir(handler)) |
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self._event_sub = self.client.create_subscription(500, handler) |
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handle = self._event_sub.subscribe_events(node) |
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self._subs_ev[node.nodeid] = handle |
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return handle |
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def unsubscribe_events(self, node): |
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self._event_sub.unsubscribe(self._subs_ev[node.nodeid]) |
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def get_root_node_and_desc(self): |
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node = self.client.get_root_node() |
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attrs = node.get_attributes([ua.AttributeIds.DisplayName, ua.AttributeIds.BrowseName, ua.AttributeIds.NodeId, ua.AttributeIds.NodeClass]) |
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desc = ua.ReferenceDescription() |
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desc.DisplayName = attrs[0].Value.Value |
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desc.BrowseName = attrs[1].Value.Value |
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desc.NodeId = attrs[2].Value.Value |
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desc.NodeClass = attrs[3].Value.Value |
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desc.TypeDefinition = ua.TwoByteNodeId(ua.ObjectIds.FolderType) |
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return node, desc |
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def get_node_attrs(self, node): |
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if not isinstance(node, Node): |
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node = self.client.get_node(node) |
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attrs = node.get_attributes([ua.AttributeIds.DisplayName, ua.AttributeIds.BrowseName, ua.AttributeIds.NodeId]) |
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return node, [attr.Value.Value.to_string() for attr in attrs] |
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def get_children(self, node): |
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descs = node.get_children_descriptions() |
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children = [] |
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for desc in descs: |
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children.append((self.client.get_node(desc.NodeId), desc)) |
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return children |
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def get_all_attrs(self, node): |
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names = [] |
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vals = [] |
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for name, val in ua.AttributeIds.__dict__.items(): |
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if not name.startswith("_"): |
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names.append(name) |
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vals.append(val) |
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attrs = node.get_attributes(vals) |
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res = {} |
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for idx, name in enumerate(names): |
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if attrs[idx].StatusCode.is_good(): |
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res[name] = attrs[idx].Value |
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return res |
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def get_all_refs(self, node): |
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return node.get_children_descriptions(refs=ua.ObjectIds.References) |
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FreeOpcUa /
opcua-client-gui
