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""" |
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server side implementation of subscription service |
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""" |
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import asyncio |
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import logging |
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from typing import Dict, Iterable |
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from asyncua import ua |
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from asyncua.common import utils |
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from .address_space import AddressSpace |
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from .internal_subscription import InternalSubscription |
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class SubscriptionService: |
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""" |
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Manages subscriptions on the server side. |
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There is one `SubscriptionService` instance for every `Server`/`InternalServer`. |
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""" |
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def __init__(self, loop: asyncio.AbstractEventLoop, aspace: AddressSpace): |
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self.logger = logging.getLogger(__name__) |
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self.loop: asyncio.AbstractEventLoop = loop |
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self.aspace: AddressSpace = aspace |
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self.subscriptions: Dict[int, InternalSubscription] = {} |
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self._sub_id_counter = 77 |
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@property |
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def active_subscription_ids(self): |
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return self.subscriptions.keys() |
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async def create_subscription(self, params, callback=None, external=False): |
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self.logger.info("create subscription") |
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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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self._sub_id_counter += 1 |
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result.SubscriptionId = self._sub_id_counter |
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internal_sub = InternalSubscription(self.loop, result, self.aspace, callback=callback, no_acks=not external) |
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await internal_sub.start() |
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self.subscriptions[result.SubscriptionId] = internal_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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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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async 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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existing_subs = [] |
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for i in ids: |
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sub = self.subscriptions.pop(i, None) |
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if sub is None: |
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res.append(ua.StatusCode(ua.StatusCodes.BadSubscriptionIdInvalid)) |
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else: |
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existing_subs.append(sub) |
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res.append(ua.StatusCode()) |
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await asyncio.gather(*[sub.stop() for sub in existing_subs]) |
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return res |
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def publish(self, acks: Iterable[ua.SubscriptionAcknowledgement]): |
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self.logger.info("publish request with acks %s", acks) |
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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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async def create_monitored_items(self, params: ua.CreateMonitoredItemsParameters): |
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self.logger.info("create monitored items") |
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if params.SubscriptionId not in self.subscriptions: |
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res = [] |
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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 await 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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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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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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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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async def trigger_event(self, event): |
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for sub in self.subscriptions.values(): |
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await sub.monitored_item_srv.trigger_event(event) |
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FreeOpcUa /
opcua-asyncio
