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import logging |
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from enum import Enum |
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from typing import Coroutine, Iterable, Optional |
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from asyncua import ua |
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from ..common.callback import CallbackType, ServerItemCallback |
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from ..common.utils import create_nonce, ServiceError |
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from .address_space import AddressSpace |
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from .users import User |
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from .subscription_service import SubscriptionService |
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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 InternalSession: |
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""" |
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""" |
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max_connections = 1000 |
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_current_connections = 0 |
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_counter = 10 |
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_auth_counter = 1000 |
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def __init__(self, internal_server, aspace: AddressSpace, submgr: SubscriptionService, name, user=User.Anonymous, |
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external=False): |
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self.logger = logging.getLogger(__name__) |
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self.iserver = internal_server |
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# define if session is external, we need to copy some objects if it is internal |
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self.external = external |
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self.aspace: AddressSpace = aspace |
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self.subscription_service: SubscriptionService = submgr |
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self.name = name |
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self.user = user |
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self.nonce = None |
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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.subscriptions = [] |
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self.auth_token = ua.NodeId(self._auth_counter) |
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InternalSession._auth_counter += 1 |
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self.logger.info('Created internal session %s', self.name) |
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def __str__(self): |
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return f'InternalSession(name:{self.name}, user:{self.user}, id:{self.session_id}, auth_token:{self.auth_token})' |
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async def get_endpoints(self, params=None, sockname=None): |
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return await self.iserver.get_endpoints(params, sockname) |
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async def create_session(self, params, sockname=None): |
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self.logger.info('Create session request') |
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result = ua.CreateSessionResult() |
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result.SessionId = self.session_id |
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result.AuthenticationToken = self.auth_token |
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result.RevisedSessionTimeout = params.RequestedSessionTimeout |
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result.MaxRequestMessageSize = 65536 |
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self.nonce = create_nonce(32) |
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result.ServerNonce = self.nonce |
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result.ServerEndpoints = await self.get_endpoints(sockname=sockname) |
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return result |
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async def close_session(self, delete_subs=True): |
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self.logger.info('close session %s', self.name) |
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if self.state == SessionState.Activated: |
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InternalSession._current_connections -= 1 |
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if InternalSession._current_connections < 0: |
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InternalSession._current_connections = 0 |
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self.state = SessionState.Closed |
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await self.delete_subscriptions(self.subscriptions) |
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def activate_session(self, params): |
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self.logger.info('activate session') |
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result = ua.ActivateSessionResult() |
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if self.state != SessionState.Created: |
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raise ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
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if InternalSession._current_connections >= InternalSession.max_connections: |
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raise ServiceError(ua.StatusCodes.BadMaxConnectionsReached) |
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self.nonce = create_nonce(32) |
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result.ServerNonce = self.nonce |
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for _ in params.ClientSoftwareCertificates: |
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result.Results.append(ua.StatusCode()) |
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self.state = SessionState.Activated |
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InternalSession._current_connections += 1 |
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id_token = params.UserIdentityToken |
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if isinstance(id_token, ua.UserNameIdentityToken): |
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if self.iserver.check_user_token(self, id_token) is False: |
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raise ServiceError(ua.StatusCodes.BadUserAccessDenied) |
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self.logger.info("Activated internal session %s for user %s", self.name, self.user) |
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return result |
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async def read(self, params): |
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results = self.iserver.attribute_service.read(params) |
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return results |
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def history_read(self, params) -> Coroutine: |
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return self.iserver.history_manager.read_history(params) |
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async def write(self, params): |
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return self.iserver.attribute_service.write(params, self.user) |
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async def browse(self, params): |
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return self.iserver.view_service.browse(params) |
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async 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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async def add_nodes(self, params): |
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return self.iserver.node_mgt_service.add_nodes(params, self.user) |
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async def delete_nodes(self, params): |
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return self.iserver.node_mgt_service.delete_nodes(params, self.user) |
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async def add_references(self, params): |
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return self.iserver.node_mgt_service.add_references(params, self.user) |
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async def delete_references(self, params): |
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return self.iserver.node_mgt_service.delete_references(params, self.user) |
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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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def call(self, params): |
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"""COROUTINE""" |
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return self.iserver.method_service.call(params) |
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async def create_subscription(self, params, callback=None): |
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result = await self.subscription_service.create_subscription(params, callback, external=self.external) |
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self.subscriptions.append(result.SubscriptionId) |
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return result |
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async def create_monitored_items(self, params: ua.CreateMonitoredItemsParameters): |
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"""Returns Future""" |
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subscription_result = await self.subscription_service.create_monitored_items(params) |
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self.iserver.server_callback_dispatcher.dispatch(CallbackType.ItemSubscriptionCreated, |
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ServerItemCallback(params, subscription_result)) |
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return subscription_result |
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async def modify_monitored_items(self, params): |
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subscription_result = self.subscription_service.modify_monitored_items(params) |
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self.iserver.server_callback_dispatcher.dispatch(CallbackType.ItemSubscriptionModified, |
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ServerItemCallback(params, subscription_result)) |
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return subscription_result |
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def republish(self, params): |
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return self.subscription_service.republish(params) |
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async def delete_subscriptions(self, ids): |
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# This is an async method, dues to symmetry with client code |
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return await self.subscription_service.delete_subscriptions(ids) |
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async def delete_monitored_items(self, params): |
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# This is an async method, dues to symmetry with client code |
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subscription_result = self.subscription_service.delete_monitored_items(params) |
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self.iserver.server_callback_dispatcher.dispatch(CallbackType.ItemSubscriptionDeleted, |
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ServerItemCallback(params, subscription_result)) |
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return subscription_result |
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def publish(self, acks: Optional[Iterable[ua.SubscriptionAcknowledgement]] = None): |
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return self.subscription_service.publish(acks or []) |
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FreeOpcUa /
opcua-asyncio
