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""" |
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Internal server implementing opcu-ua interface. can be used on server side or to implement binary/https opc-ua servers |
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""" |
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from datetime import datetime |
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from copy import copy |
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import logging |
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from threading import Lock |
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from enum import Enum |
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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 import utils |
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from opcua import Node |
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from opcua.address_space import AddressSpace |
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from opcua.address_space import AttributeService |
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from opcua.address_space import ViewService |
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from opcua.address_space import NodeManagementService |
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from opcua.address_space import MethodService |
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from opcua.subscription_service import SubscriptionService |
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from opcua import standard_address_space |
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from opcua.users import User |
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from opcua import xmlimporter |
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class SessionState(Enum): |
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Created = 0 |
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Activated = 1 |
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Closed = 2 |
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class ServerDesc(object): |
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def __init__(self, serv, cap=None): |
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self.Server = serv |
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self.Capabilities = cap |
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class InternalServer(object): |
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def __init__(self): |
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self.logger = logging.getLogger(__name__) |
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self.endpoints = [] |
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self._channel_id_counter = 5 |
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self.allow_remote_admin = True |
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self.disabled_clock = False # for debugging we may want to disable clock that writes too much in log |
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self._known_servers = {} # used if we are a discovery server |
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self.aspace = AddressSpace() |
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self.attribute_service = AttributeService(self.aspace) |
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self.view_service = ViewService(self.aspace) |
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self.method_service = MethodService(self.aspace) |
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self.node_mgt_service = NodeManagementService(self.aspace) |
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# import address space from code generated from xml |
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standard_address_space.fill_address_space(self.node_mgt_service) |
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# import address space from save db to disc |
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#standard_address_space.fill_address_space_from_disk(self.aspace) |
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# import address space directly from xml, this has preformance impact so disabled |
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#importer = xmlimporter.XmlImporter(self.node_mgt_service) |
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#importer.import_xml("/home/olivier/python-opcua/schemas/Opc.Ua.NodeSet2.xml") |
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self.loop = utils.ThreadLoop() |
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self.subscription_service = SubscriptionService(self.loop, self.aspace) |
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# create a session to use on server side |
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self.isession = InternalSession(self, self.aspace, self.subscription_service, "Internal", user=User.Admin) |
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self.current_time_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_CurrentTime)) |
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uries = ["http://opcfoundation.org/UA/"] |
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ns_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
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ns_node.set_value(uries) |
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def load_address_space(self, path): |
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self.aspace.load(path) |
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def dump_address_space(self, path): |
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self.aspace.dump(path) |
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def start(self): |
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self.logger.info("starting internal server") |
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self.loop.start() |
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Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_State)).set_value(0) |
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Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_StartTime)).set_value(datetime.now()) |
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if not self.disabled_clock: |
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self._set_current_time() |
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def stop(self): |
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self.logger.info("stopping internal server") |
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self.loop.stop() |
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def _set_current_time(self): |
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self.current_time_node.set_value(datetime.now()) |
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self.loop.call_later(1, self._set_current_time) |
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def get_new_channel_id(self): |
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self._channel_id_counter += 1 |
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return self._channel_id_counter |
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def add_endpoint(self, endpoint): |
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self.endpoints.append(endpoint) |
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def get_endpoints(self, params=None, sockname=None): |
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self.logger.info("get endpoint") |
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if sockname: |
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#return to client the ip address it has access to |
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edps = [] |
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for edp in self.endpoints: |
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edp1 = copy(edp) |
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url = urlparse(edp1.EndpointUrl) |
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url = url._replace(netloc=sockname[0] + ":" + str(sockname[1])) |
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edp1.EndpointUrl = url.geturl() |
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edps.append(edp1) |
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return edps |
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return self.endpoints[:] |
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def find_servers(self, params): |
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#FIXME: implement filtering from parmams.uri |
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servers = [] |
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for edp in self.endpoints: |
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servers.append(edp.Server) |
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return servers + [desc.Server for desc in self._known_servers.values()] |
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def register_server(self, server, conf=None): |
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appdesc = ua.ApplicationDescription() |
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appdesc.ApplicationUri = server.ServerUri |
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appdesc.ProductUri = server.ProductUri |
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appdesc.ApplicationName = server.ServerNames[0] # FIXME: select name from client locale |
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appdesc.ApplicationType = server.ServerType |
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appdesc.GatewayServerUri = server.GatewayServerUri |
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appdesc.DiscoveryUrls = server.DiscoveryUrls # FIXME: select discovery uri using reachability from client network |
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self._known_servers[server.ServerUri] = ServerDesc(appdesc, conf) |
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def register_server2(self, params): |
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return self.register_server(params.Server, params.DiscoveryConfiguration) |
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def create_session(self, name, user=User.Anonymous): |
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return InternalSession(self, self.aspace, self.subscription_service, name, user=user) |
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class InternalSession(object): |
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_counter = 10 |
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_auth_counter = 1000 |
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def __init__(self, internal_server, aspace, submgr, name, user=User.Anonymous): |
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self.logger = logging.getLogger(__name__) |
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self.iserver = internal_server |
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self.aspace = aspace |
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self.subscription_service = submgr |
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self.name = name |
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self.user = user |
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self.state = SessionState.Created |
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self.session_id = ua.NodeId(self._counter) |
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InternalSession._counter += 1 |
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self.authentication_token = ua.NodeId(self._auth_counter) |
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InternalSession._auth_counter += 1 |
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self.nonce = utils.create_nonce() |
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self.subscriptions = [] |
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#self.logger.debug("Created internal session %s for user %s", self.name, self.user) |
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print("Created internal session {} for user {}".format(self.name, self.user)) |
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self._lock = Lock() |
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def __str__(self): |
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return "InternalSession(name:{}, user:{}, id:{}, auth_token:{})".format(self.name, self.user, self.session_id, self.authentication_token) |
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168
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def get_endpoints(self, params=None, sockname=None): |
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return self.iserver.get_endpoints(params, sockname) |
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171
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def create_session(self, params, sockname=None): |
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self.logger.info("Create session request") |
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174
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result = ua.CreateSessionResult() |
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result.SessionId = self.session_id |
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result.AuthenticationToken = self.authentication_token |
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result.RevisedSessionTimeout = params.RequestedSessionTimeout |
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result.MaxRequestMessageSize = 65536 |
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result.ServerNonce = self.nonce |
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result.ServerEndpoints = self.get_endpoints(sockname=sockname) |
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182
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return result |
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184
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def close_session(self, delete_subs): |
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185
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self.logger.info("close session %s with subscriptions %s", self, self.subscriptions) |
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186
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self.state = SessionState.Closed |
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187
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self.delete_subscriptions(self.subscriptions[:]) |
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188
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189
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def activate_session(self, params): |
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self.logger.info("activate session") |
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191
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result = ua.ActivateSessionResult() |
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192
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if not self.state == SessionState.Created: |
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raise utils.ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
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194
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result.ServerNonce = self.nonce |
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195
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for _ in params.ClientSoftwareCertificates: |
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196
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result.Results.append(ua.StatusCode()) |
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197
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self.state = SessionState.Activated |
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198
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id_token = params.UserIdentityToken |
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199
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if isinstance(id_token, ua.UserNameIdentityToken): |
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200
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1 |
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if self.iserver.allow_remote_admin and id_token.UserName in ("admin", "Admin"): |
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201
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self.user = User.Admin |
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202
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return result |
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203
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204
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def read(self, params): |
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205
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return self.iserver.attribute_service.read(params) |
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206
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207
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def write(self, params): |
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208
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return self.iserver.attribute_service.write(params, self.user) |
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209
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210
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def browse(self, params): |
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211
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return self.iserver.view_service.browse(params) |
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213
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def translate_browsepaths_to_nodeids(self, params): |
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return self.iserver.view_service.translate_browsepaths_to_nodeids(params) |
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215
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216
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def add_nodes(self, params): |
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return self.iserver.node_mgt_service.add_nodes(params, self.user) |
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219
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def add_references(self, params): |
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return self.iserver.node_mgt_service.add_references(params, self.user) |
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221
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222
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def add_method_callback(self, methodid, callback): |
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return self.aspace.add_method_callback(methodid, callback) |
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225
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def call(self, params): |
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226
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return self.iserver.method_service.call(params) |
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228
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def create_subscription(self, params, callback): |
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result = self.subscription_service.create_subscription(params, callback) |
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with self._lock: |
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231
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self.subscriptions.append(result.SubscriptionId) |
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return result |
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234
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def create_monitored_items(self, params): |
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235
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return self.subscription_service.create_monitored_items(params) |
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236
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237
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def modify_monitored_items(self, params): |
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238
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return self.subscription_service.modify_monitored_items(params) |
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239
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240
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1 |
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def republish(self, params): |
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241
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return self.subscription_service.republish(params) |
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242
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243
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1 |
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def delete_subscriptions(self, ids): |
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244
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1 |
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for i in ids: |
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245
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1 |
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with self._lock: |
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246
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1 |
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if i in self.subscriptions: |
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247
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1 |
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self.subscriptions.remove(i) |
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248
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1 |
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return self.subscription_service.delete_subscriptions(ids) |
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249
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250
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1 |
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def delete_monitored_items(self, params): |
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251
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return self.subscription_service.delete_monitored_items(params) |
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252
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253
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1 |
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def publish(self, acks=None): |
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254
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1 |
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if acks is None: |
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255
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1 |
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acks = [] |
|
256
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return self.subscription_service.publish(acks) |
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257
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FreeOpcUa /
python-opcua
