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import logging |
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from PyQt5.QtCore import QSettings |
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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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from opcua import crypto |
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logger = logging.getLogger(__name__) |
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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 what GUI needs, no customization possible |
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""" |
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def __init__(self): |
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self.settings = QSettings() |
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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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self.security_mode = None |
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self.security_policy = None |
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self.certificate_path = None |
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self.private_key_path = None |
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def load_security_settings(self, uri): |
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self.security_mode = None |
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self.security_policy = None |
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self.certificate_path = None |
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self.private_key_path = None |
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mysettings = self.settings.value("security_settings", None) |
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if mysettings is None: |
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return |
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if uri in mysettings: |
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mode, policy, cert, key = mysettings[uri] |
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self.security_mode = mode |
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self.security_policy = policy |
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self.certificate_path = cert |
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self.private_key_path = key |
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def save_security_settings(self, uri): |
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mysettings = self.settings.value("security_settings", None) |
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if mysettings is None: |
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mysettings = {} |
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mysettings[uri] = [self.security_mode, |
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self.security_policy, |
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self.certificate_path, |
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self.private_key_path] |
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self.settings.setValue("security_settings", mysettings) |
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def get_node(self, nodeid): |
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return self.client.get_node(nodeid) |
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def connect(self, uri): |
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self.disconnect() |
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logger.info("Connecting to %s with parameters %s, %s, %s, %s", uri, self.security_mode, self.security_policy, self.certificate_path, self.private_key_path) |
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self.client = Client(uri) |
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if self.security_mode is not None and self.security_policy is not None: |
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self.client.set_security( |
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getattr(crypto.security_policies, 'SecurityPolicy' + self.security_policy), |
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self.certificate_path, |
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self.private_key_path, |
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mode=getattr(ua.MessageSecurityMode, self.security_mode) |
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) |
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self.client.connect() |
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self._connected = True |
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self.save_security_settings(uri) |
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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.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_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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@staticmethod |
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def get_children(node): |
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descs = node.get_children_descriptions() |
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descs.sort(key=lambda x: x.BrowseName) |
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return descs |
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FreeOpcUa /
opcua-client-gui
