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""" |
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server side implementation of subscription service |
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""" |
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from threading import RLock |
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import logging |
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from opcua import ua |
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from opcua.common import utils |
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from opcua.server.internal_subscription import InternalSubscription |
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class SubscriptionService(object): |
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def __init__(self, aspace): |
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self.logger = logging.getLogger(__name__) |
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self.loop = None |
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self.aspace = aspace |
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self.subscriptions = {} |
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self._sub_id_counter = 77 |
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self._lock = RLock() |
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def set_loop(self, loop): |
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self.loop = loop |
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def create_subscription(self, params, callback): |
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self.logger.info("create subscription with callback: %s", callback) |
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result = ua.CreateSubscriptionResult() |
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result.RevisedPublishingInterval = params.RequestedPublishingInterval |
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result.RevisedLifetimeCount = params.RequestedLifetimeCount |
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result.RevisedMaxKeepAliveCount = params.RequestedMaxKeepAliveCount |
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with self._lock: |
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self._sub_id_counter += 1 |
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result.SubscriptionId = self._sub_id_counter |
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sub = InternalSubscription(self, result, self.aspace, callback) |
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sub.start() |
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self.subscriptions[result.SubscriptionId] = sub |
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return result |
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def modify_subscription(self, params, callback): |
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# Requested params are ignored, result = params set during create_subscription. |
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self.logger.info("modify subscription with callback: %s", callback) |
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result = ua.ModifySubscriptionResult() |
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try: |
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with self._lock: |
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sub = self.subscriptions[params.SubscriptionId] |
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result.RevisedPublishingInterval = sub.data.RevisedPublishingInterval |
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result.RevisedLifetimeCount = sub.data.RevisedLifetimeCount |
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result.RevisedMaxKeepAliveCount = sub.data.RevisedMaxKeepAliveCount |
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return result |
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except KeyError: |
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raise utils.ServiceError(ua.StatusCodes.BadSubscriptionIdInvalid) |
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View Code Duplication |
def delete_subscriptions(self, ids): |
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self.logger.info("delete subscriptions: %s", ids) |
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res = [] |
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for i in ids: |
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with self._lock: |
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if i not in self.subscriptions: |
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res.append(ua.StatusCode(ua.StatusCodes.BadSubscriptionIdInvalid)) |
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else: |
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sub = self.subscriptions.pop(i) |
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sub.stop() |
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res.append(ua.StatusCode()) |
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return res |
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View Code Duplication |
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def publish(self, acks): |
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self.logger.info("publish request with acks %s", acks) |
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with self._lock: |
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for subid, sub in self.subscriptions.items(): |
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sub.publish([ack.SequenceNumber for ack in acks if ack.SubscriptionId == subid]) |
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def create_monitored_items(self, params): |
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self.logger.info("create monitored items") |
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with self._lock: |
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if params.SubscriptionId not in self.subscriptions: |
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res = [] |
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View Code Duplication |
for _ in params.ItemsToCreate: |
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response = ua.MonitoredItemCreateResult() |
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response.StatusCode = ua.StatusCode(ua.StatusCodes.BadSubscriptionIdInvalid) |
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res.append(response) |
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return res |
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return self.subscriptions[params.SubscriptionId].monitored_item_srv.create_monitored_items(params) |
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def modify_monitored_items(self, params): |
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self.logger.info("modify monitored items") |
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with self._lock: |
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if params.SubscriptionId not in self.subscriptions: |
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res = [] |
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for _ in params.ItemsToModify: |
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result = ua.MonitoredItemModifyResult() |
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result.StatusCode = ua.StatusCode(ua.StatusCodes.BadSubscriptionIdInvalid) |
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res.append(result) |
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return res |
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return self.subscriptions[params.SubscriptionId].monitored_item_srv.modify_monitored_items(params) |
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def delete_monitored_items(self, params): |
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self.logger.info("delete monitored items") |
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with self._lock: |
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if params.SubscriptionId not in self.subscriptions: |
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res = [] |
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for _ in params.MonitoredItemIds: |
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res.append(ua.StatusCode(ua.StatusCodes.BadSubscriptionIdInvalid)) |
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return res |
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return self.subscriptions[params.SubscriptionId].monitored_item_srv.delete_monitored_items( |
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params.MonitoredItemIds) |
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def republish(self, params): |
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with self._lock: |
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if params.SubscriptionId not in self.subscriptions: |
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# TODO: what should I do? |
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return ua.NotificationMessage() |
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return self.subscriptions[params.SubscriptionId].republish(params.RetransmitSequenceNumber) |
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def trigger_event(self, event): |
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with self._lock: |
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for sub in self.subscriptions.values(): |
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sub.monitored_item_srv.trigger_event(event) |
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FreeOpcUa /
python-opcua
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