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""" |
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High level interface to pure python OPC-UA server |
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""" |
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import logging |
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try: |
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from urllib.parse import urlparse |
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except ImportError: |
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from urlparse import urlparse |
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from opcua import ua |
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#from opcua.binary_server import BinaryServer |
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from opcua.binary_server_asyncio import BinaryServer |
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from opcua.internal_server import InternalServer |
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from opcua import Node, Subscription, ObjectIds, Event |
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from opcua import xmlimporter |
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from opcua import Client |
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class Server(object): |
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""" |
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High level Server class |
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Create an opcua server with default values |
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The class is very short. Users are adviced to read the code. |
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Create your own namespace and then populate your server address space |
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using use the get_root() or get_objects() to get Node objects. |
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and get_event_object() to fire events. |
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Then start server. See example_server.py |
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All methods are threadsafe |
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:ivar application_uri: |
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:vartype application_uri: uri |
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:ivar product_uri: |
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:vartype product_uri: uri |
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:ivar name: |
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:vartype name: string |
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:ivar default_timeout: timout in milliseconds for sessions and secure channel |
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:vartype default_timeout: int |
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:ivar iserver: internal server object |
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:vartype default_timeout: InternalServer |
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:ivar bserver: binary protocol server |
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:vartype bserver: BinaryServer |
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""" |
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def __init__(self): |
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self.logger = logging.getLogger(__name__) |
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self.endpoint = urlparse("opc.tcp://0.0.0.0:4841/freeopcua/server/") |
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self.application_uri = "urn:freeopcua:python:server" |
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self.product_uri = "urn:freeopcua.github.no:python:server" |
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self.name = "FreeOpcUa Python Server" |
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self.application_type = ua.ApplicationType.ClientAndServer |
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self.default_timeout = 3600000 |
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self.iserver = InternalServer() |
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self.bserver = None |
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self._discovery_client = None |
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self._discovery_period = 60 |
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# setup some expected values |
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self.register_namespace(self.application_uri) |
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sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray)) |
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sa_node.set_value([self.application_uri]) |
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def set_application_uri(self, uri): |
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""" |
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Set application/server URI. |
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This uri is supposed to be unique. If you intent to register |
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your server to a discovery server, it really should be unique in |
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your system! |
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default is : "urn:freeopcua:python:server" |
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""" |
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self.application_uri = uri |
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def find_servers(self, uris=[]): |
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params = ua.FindServersParameters() |
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params.EndpointUrl = self.endpoint.geturl() |
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params.ServerUris = uris |
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return self.iserver.find_servers(params) |
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def register_to_discovery(self, url, period=60): |
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""" |
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Register to a OPC-UA Discovery server. Registering must be renewed at |
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least every 10 minutes, so this method will use our asyncio thread to |
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re-register every period seconds |
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""" |
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self._discovery_period = period |
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self._discovery_client = Client(url) |
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self._discovery_client.connect() |
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self.iserver.loop.call_soon(self._renew_registration) |
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def _renew_registration(self): |
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if self._discovery_client: |
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self._discovery_client.register_server(self) |
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self.iserver.loop.call_later(self._discovery_period, self._renew_registration) |
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def allow_remote_admin(self, allow): |
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""" |
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Enable or disable the builtin Admin user from network clients |
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""" |
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self.iserver.allow_remote_admin = allow |
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def set_endpoint(self, url): |
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self.endpoint = urlparse(url) |
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def get_endpoints(self): |
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return self.iserver.get_endpoints() |
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def _setup_server_nodes(self): |
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# to be called just before starting server since it needs all parameters to be setup |
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self._set_endpoints() |
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def _set_endpoints(self): |
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idtoken = ua.UserTokenPolicy() |
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idtoken.PolicyId = 'anonymous' |
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idtoken.TokenType = ua.UserTokenType.Anonymous |
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appdesc = ua.ApplicationDescription() |
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appdesc.ApplicationName = ua.LocalizedText(self.name) |
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appdesc.ApplicationUri = self.application_uri |
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appdesc.ApplicationType = self.application_type |
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appdesc.ProductUri = self.product_uri |
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appdesc.DiscoveryUrls.append(self.endpoint.geturl()) |
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edp = ua.EndpointDescription() |
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edp.EndpointUrl = self.endpoint.geturl() |
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edp.Server = appdesc |
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edp.SecurityMode = ua.MessageSecurityMode.None_ |
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edp.SecurityPolicyUri = 'http://opcfoundation.org/UA/SecurityPolicy#None' |
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edp.UserIdentityTokens = [idtoken] |
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edp.TransportProfileUri = 'http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary' |
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edp.SecurityLevel = 0 |
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# FIXME: advertise support for user and certificate identity |
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self.iserver.add_endpoint(edp) |
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def set_server_name(self, name): |
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self.name = name |
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def start(self): |
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""" |
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Start to listen on network |
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""" |
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self.iserver.start() |
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self._setup_server_nodes() |
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self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port) |
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self.bserver.start() |
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def stop(self): |
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""" |
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Stop server |
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""" |
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if self._discovery_client: |
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self._discovery_client.disconnect() |
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self.bserver.stop() |
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self.iserver.stop() |
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def get_root_node(self): |
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""" |
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Get Root node of server. Returns a Node object. |
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""" |
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return self.get_node(ua.TwoByteNodeId(ObjectIds.RootFolder)) |
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def get_objects_node(self): |
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""" |
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Get Objects node of server. Returns a Node object. |
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""" |
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return self.get_node(ua.TwoByteNodeId(ObjectIds.ObjectsFolder)) |
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def get_server_node(self): |
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""" |
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Get Server node of server. Returns a Node object. |
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""" |
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return self.get_node(ua.TwoByteNodeId(ObjectIds.Server)) |
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def get_node(self, nodeid): |
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""" |
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Get a specific node using NodeId object or a string representing a NodeId |
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""" |
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return Node(self.iserver.isession, nodeid) |
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def create_subscription(self, period, handler): |
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""" |
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Create a subscription. |
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returns a Subscription object which allow |
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to subscribe to events or data on server |
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""" |
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params = ua.CreateSubscriptionParameters() |
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params.RequestedPublishingInterval = period |
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params.RequestedLifetimeCount = 3000 |
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params.RequestedMaxKeepAliveCount = 10000 |
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params.MaxNotificationsPerPublish = 0 |
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params.PublishingEnabled = True |
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params.Priority = 0 |
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return Subscription(self.iserver.isession, params, handler) |
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def get_namespace_array(self): |
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""" |
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get all namespace defined in server |
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""" |
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ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
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return ns_node.get_value() |
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def register_namespace(self, uri): |
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""" |
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Register a new namespace. Nodes should in custom namespace, not 0. |
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""" |
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ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
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uries = ns_node.get_value() |
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uries.append(uri) |
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ns_node.set_value(uries) |
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return (len(uries) - 1) |
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def get_namespace_index(self, uri): |
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""" |
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get index of a namespace using its uri |
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""" |
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uries = self.get_namespace_array() |
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return uries.index(uri) |
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def get_event_object(self, etype=ObjectIds.BaseEventType, source=ObjectIds.Server): |
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""" |
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Returns an event object using an event type from address space. |
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Use this object to fire events |
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""" |
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return Event(self.iserver.isession, etype, source) |
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def import_xml(self, path): |
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""" |
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import nodes defined in xml |
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""" |
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importer = xmlimporter.XmlImporter(self.iserver.node_mgt_service) |
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importer.import_xml(path) |
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FreeOpcUa /
python-opcua
