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Added strategies to handle subscription loop
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201
Sources/PubNub/Subscription/Strategy/EventEngineSubscriptionSessionStrategy.swift
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|---|---|---|
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| // | ||
| // EventEngineSubscriptionSessionStrategy.swift | ||
| // | ||
| // PubNub Real-time Cloud-Hosted Push API and Push Notification Client Frameworks | ||
| // Copyright © 2019 PubNub Inc. | ||
| // http://www.pubnub.com/ | ||
| // http://www.pubnub.com/terms | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| class EventEngineSubscriptionSessionStrategy: SubscriptionSessionStrategy { | ||
| let uuid = UUID() | ||
|
|
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| var privateListeners: WeakSet<ListenerType> = WeakSet([]) | ||
| var configuration: SubscriptionConfiguration | ||
| var subscribeEngine: SubscribeEngine | ||
| var presenceEngine: PresenceEngine | ||
| var previousTokenResponse: SubscribeCursor? | ||
|
|
||
| internal init( | ||
| configuration: SubscriptionConfiguration, | ||
| subscribeEngine: SubscribeEngine, | ||
| presenceEngine: PresenceEngine | ||
| ) { | ||
| self.subscribeEngine = subscribeEngine | ||
| self.configuration = configuration | ||
| self.presenceEngine = presenceEngine | ||
| self.listenForStateUpdates() | ||
| } | ||
|
|
||
| var subscribedChannels: [String] { | ||
| subscribeEngine.state.input.subscribedChannels | ||
| } | ||
|
|
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| var subscribedChannelGroups: [String] { | ||
| subscribeEngine.state.input.subscribedGroups | ||
| } | ||
|
|
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| var subscriptionCount: Int { | ||
| subscribeEngine.state.input.totalSubscribedCount | ||
| } | ||
|
|
||
| var connectionStatus: ConnectionStatus { | ||
| subscribeEngine.state.connectionStatus | ||
| } | ||
|
|
||
| deinit { | ||
| PubNub.log.debug("SubscriptionSession Destroyed") | ||
| // Poke the session factory to clean up nil values | ||
| SubscribeSessionFactory.shared.sessionDestroyed() | ||
| } | ||
|
|
||
| private func listenForStateUpdates() { | ||
| subscribeEngine.onStateUpdated = { [weak self] state in | ||
| if state.hasTimetoken { | ||
| self?.previousTokenResponse = state.cursor | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func updateSubscribeEngineInput() { | ||
| subscribeEngine.customInput = EventEngineCustomInput( | ||
| value: Subscribe.EngineInput( | ||
| configuration: configuration, | ||
| listeners: privateListeners.allObjects | ||
| ) | ||
| ) | ||
| } | ||
|
|
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| private func sendSubscribeEvent(event: Subscribe.Event) { | ||
| updateSubscribeEngineInput() | ||
| subscribeEngine.send(event: event) | ||
| } | ||
|
|
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| private func updatePresenceEngineInput() { | ||
| presenceEngine.customInput = EventEngineCustomInput( | ||
| value: Presence.EngineInput( | ||
| configuration: configuration | ||
| ) | ||
| ) | ||
| } | ||
|
|
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| private func sendPresenceEvent(event: Presence.Event) { | ||
| updatePresenceEngineInput() | ||
| presenceEngine.send(event: event) | ||
| } | ||
|
|
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| // MARK: - Subscription Loop | ||
|
|
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| func subscribe( | ||
| to channels: [String], | ||
| and groups: [String] = [], | ||
| at cursor: SubscribeCursor? = nil, | ||
| withPresence: Bool = false | ||
| ) { | ||
| let newInput = subscribeEngine.state.input + SubscribeInput( | ||
| channels: channels.map { PubNubChannel(id: $0, withPresence: withPresence) }, | ||
| groups: groups.map { PubNubChannel(id: $0, withPresence: withPresence) } | ||
| ) | ||
| if let cursor = cursor, cursor.timetoken != 0 { | ||
| sendSubscribeEvent(event: .subscriptionRestored( | ||
| channels: newInput.allSubscribedChannels, | ||
| groups: newInput.allSubscribedGroups, | ||
| cursor: cursor | ||
| )) | ||
| } else { | ||
| sendSubscribeEvent(event: .subscriptionChanged( | ||
| channels: newInput.allSubscribedChannels, | ||
| groups: newInput.allSubscribedGroups | ||
| )) | ||
| } | ||
| sendPresenceEvent(event: .joined( | ||
| channels: newInput.presenceSubscribedChannels, | ||
| groups: newInput.presenceSubscribedGroups | ||
| )) | ||
| } | ||
|
|
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| func reconnect(at cursor: SubscribeCursor? = nil) { | ||
| let input = subscribeEngine.state.input | ||
| let channels = input.allSubscribedChannels | ||
| let groups = input.allSubscribedGroups | ||
|
|
||
| if let cursor = cursor { | ||
| sendSubscribeEvent(event: .subscriptionRestored(channels: channels, groups: groups, cursor: cursor)) | ||
| } else { | ||
| sendSubscribeEvent(event: .reconnect) | ||
| } | ||
| } | ||
|
|
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| func disconnect() { | ||
| sendSubscribeEvent(event: .disconnect) | ||
| sendPresenceEvent(event: .disconnect) | ||
| } | ||
|
|
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| // MARK: - Unsubscribe | ||
|
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| func unsubscribe(from channels: [String], and groups: [String] = [], presenceOnly: Bool = false) { | ||
| let newInput = subscribeEngine.state.input - ( | ||
| channels: channels.map { presenceOnly ? $0.presenceChannelName : $0 }, | ||
| groups: groups.map { presenceOnly ? $0.presenceChannelName : $0 } | ||
| ) | ||
| sendSubscribeEvent(event: .subscriptionChanged( | ||
| channels: newInput.allSubscribedChannels, | ||
| groups: newInput.allSubscribedGroups | ||
| )) | ||
| sendPresenceEvent(event: .left( | ||
| channels: channels, | ||
| groups: groups | ||
| )) | ||
| } | ||
|
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| func unsubscribeAll() { | ||
| sendSubscribeEvent(event: .unsubscribeAll) | ||
| sendPresenceEvent(event: .leftAll) | ||
| } | ||
| } | ||
|
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| extension EventEngineSubscriptionSessionStrategy: EventStreamEmitter { | ||
| typealias ListenerType = BaseSubscriptionListener | ||
|
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| var listeners: [ListenerType] { | ||
| privateListeners.allObjects | ||
| } | ||
|
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| func add(_ listener: ListenerType) { | ||
| // Ensure that we cancel the previously attached token | ||
| listener.token?.cancel() | ||
| // Add new token to the listener | ||
| listener.token = ListenerToken { [weak self, weak listener] in | ||
| if let listener = listener { | ||
| self?.privateListeners.remove(listener) | ||
| self?.updateSubscribeEngineInput() | ||
| } | ||
| } | ||
| privateListeners.update(listener) | ||
| updateSubscribeEngineInput() | ||
| } | ||
|
|
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| func notify(listeners closure: (ListenerType) -> Void) { | ||
| listeners.forEach { closure($0) } | ||
| } | ||
| } |
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