Update UI in responds to remote changes of saved hashtags/instances
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parent
d13b517128
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32be76ebee
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@ -39,6 +39,9 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
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return context
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return context
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}()
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}()
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private var remoteChangeHandlerQueue = DispatchQueue(label: "PersistentStore remote changes")
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private var lastRemoteChangeToken: NSPersistentHistoryToken?
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// TODO: consider sending managed objects through this to avoid re-fetching things unnecessarily
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// TODO: consider sending managed objects through this to avoid re-fetching things unnecessarily
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// would need to audit existing uses to make sure everything happens on the main thread
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// would need to audit existing uses to make sure everything happens on the main thread
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// and when updating things on the background context would need to switch to main, refetch, and then publish
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// and when updating things on the background context would need to switch to main, refetch, and then publish
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@ -63,6 +66,8 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
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localStoreLocation.appendPathComponent("\(accountInfo!.persistenceKey)_cache.sqlite", isDirectory: false)
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localStoreLocation.appendPathComponent("\(accountInfo!.persistenceKey)_cache.sqlite", isDirectory: false)
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let localStoreDescription = NSPersistentStoreDescription(url: localStoreLocation)
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let localStoreDescription = NSPersistentStoreDescription(url: localStoreLocation)
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localStoreDescription.configuration = "Local"
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localStoreDescription.configuration = "Local"
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localStoreDescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
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localStoreDescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
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var cloudStoreLocation = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
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var cloudStoreLocation = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
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cloudStoreLocation.appendPathComponent("cloud.sqlite", isDirectory: false)
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cloudStoreLocation.appendPathComponent("cloud.sqlite", isDirectory: false)
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@ -71,6 +76,8 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
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let options = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.space.vaccor.Tusker")
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let options = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.space.vaccor.Tusker")
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options.databaseScope = .private
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options.databaseScope = .private
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cloudStoreDescription.cloudKitContainerOptions = options
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cloudStoreDescription.cloudKitContainerOptions = options
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cloudStoreDescription.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
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cloudStoreDescription.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
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persistentStoreDescriptions = [
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persistentStoreDescriptions = [
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cloudStoreDescription,
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cloudStoreDescription,
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@ -167,6 +174,7 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
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viewContext.mergePolicy = NSMergePolicy.mergeByPropertyObjectTrump
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viewContext.mergePolicy = NSMergePolicy.mergeByPropertyObjectTrump
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NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: viewContext)
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NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: viewContext)
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NotificationCenter.default.addObserver(self, selector: #selector(remoteChanges), name: .NSPersistentStoreRemoteChange, object: persistentStoreCoordinator)
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}
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}
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func save(context: NSManagedObjectContext) {
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func save(context: NSManagedObjectContext) {
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@ -475,4 +483,45 @@ class MastodonCachePersistentStore: NSPersistentCloudKitContainer {
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return changes
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return changes
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}
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}
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// the remote change notifications only handle deletes, inserts get handled by the regular managed object did change notifications
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@objc private func remoteChanges(_ notification: Foundation.Notification) {
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guard let token = notification.userInfo?[NSPersistentHistoryTokenKey] as? NSPersistentHistoryToken else {
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return
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}
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remoteChangeHandlerQueue.async {
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defer {
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self.lastRemoteChangeToken = token
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}
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let req = NSPersistentHistoryChangeRequest.fetchHistory(after: self.lastRemoteChangeToken)
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self.backgroundContext.performAndWait {
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if let result = try? self.backgroundContext.execute(req) as? NSPersistentHistoryResult,
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let transactions = result.result as? [NSPersistentHistoryTransaction] {
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var changes: (hashtags: Bool, instances: Bool) = (false, false)
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outer: for transaction in transactions {
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for change in transaction.changes ?? [] {
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if change.changedObjectID.entity.name == "SavedHashtag" {
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changes.hashtags = true
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} else if change.changedObjectID.entity.name == "SavedInstance" {
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changes.instances = true
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}
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if changes.hashtags && changes.instances {
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break outer
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}
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}
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}
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if changes.hashtags {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .savedHashtagsChanged, object: nil)
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}
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}
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if changes.instances {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .savedInstancesChanged, object: nil)
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}
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}
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}
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}
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}
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}
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}
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}
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