mirror of
https://github.com/writeas/writefreely-swiftui-multiplatform.git
synced 2024-11-15 01:11:02 +00:00
15f84b04c0
Two outliers to come back to are: - the LocalStoreManager, where we can’t set a current error in the WriteFreelyModel in methods that can’t throw - the CollectionListModel, where the initializer can’t throw because we use it as a property initializer in CollectionListView
126 lines
4.6 KiB
Swift
126 lines
4.6 KiB
Swift
import CoreData
|
||
|
||
#if os(iOS)
|
||
import UIKit
|
||
#elseif os(macOS)
|
||
import AppKit
|
||
#endif
|
||
|
||
final class LocalStorageManager {
|
||
|
||
public static var standard = LocalStorageManager()
|
||
public let container: NSPersistentContainer
|
||
private let containerName = "LocalStorageModel"
|
||
|
||
private init() {
|
||
container = NSPersistentContainer(name: containerName)
|
||
setupStore(in: container)
|
||
registerObservers()
|
||
}
|
||
|
||
func saveContext() {
|
||
if container.viewContext.hasChanges {
|
||
do {
|
||
try container.viewContext.save()
|
||
} catch {
|
||
fatalError(LocalStoreError.couldNotSaveContext.localizedDescription)
|
||
}
|
||
}
|
||
}
|
||
|
||
func purgeUserCollections() throws {
|
||
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFACollection")
|
||
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
|
||
|
||
do {
|
||
try container.viewContext.executeAndMergeChanges(using: deleteRequest)
|
||
} catch {
|
||
throw LocalStoreError.couldNotPurgeCollections
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
private extension LocalStorageManager {
|
||
|
||
var oldStoreURL: URL {
|
||
let appSupport = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
|
||
return appSupport.appendingPathComponent("LocalStorageModel.sqlite")
|
||
}
|
||
|
||
var sharedStoreURL: URL {
|
||
let id = "group.com.abunchtell.writefreely"
|
||
let groupContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: id)!
|
||
return groupContainer.appendingPathComponent("LocalStorageModel.sqlite")
|
||
}
|
||
|
||
func setupStore(in container: NSPersistentContainer) {
|
||
if !FileManager.default.fileExists(atPath: oldStoreURL.path) {
|
||
container.persistentStoreDescriptions.first!.url = sharedStoreURL
|
||
}
|
||
|
||
container.loadPersistentStores { _, error in
|
||
if let error = error {
|
||
fatalError(LocalStoreError.couldNotLoadStore(error.localizedDescription).localizedDescription)
|
||
}
|
||
}
|
||
migrateStore(for: container)
|
||
container.viewContext.automaticallyMergesChangesFromParent = true
|
||
container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
|
||
}
|
||
|
||
func migrateStore(for container: NSPersistentContainer) {
|
||
// Check if the shared store exists before attempting a migration — for example, in case we've already attempted
|
||
// and successfully completed a migration, but the deletion of the old store failed for some reason.
|
||
guard !FileManager.default.fileExists(atPath: sharedStoreURL.path) else { return }
|
||
|
||
let coordinator = container.persistentStoreCoordinator
|
||
|
||
// Get a reference to the old store.
|
||
guard let oldStore = coordinator.persistentStore(for: oldStoreURL) else {
|
||
return
|
||
}
|
||
|
||
// Attempt to migrate the old store over to the shared store URL.
|
||
do {
|
||
try coordinator.migratePersistentStore(oldStore,
|
||
to: sharedStoreURL,
|
||
options: nil,
|
||
withType: NSSQLiteStoreType)
|
||
} catch {
|
||
fatalError(LocalStoreError.couldNotMigrateStore(error.localizedDescription).localizedDescription)
|
||
}
|
||
|
||
// Attempt to delete the old store.
|
||
do {
|
||
try FileManager.default.removeItem(at: oldStoreURL)
|
||
} catch {
|
||
fatalError(
|
||
LocalStoreError.couldNotDeleteStoreAfterMigration(error.localizedDescription).localizedDescription
|
||
)
|
||
}
|
||
}
|
||
|
||
func registerObservers() {
|
||
let center = NotificationCenter.default
|
||
|
||
#if os(iOS)
|
||
let notification = UIApplication.willResignActiveNotification
|
||
#elseif os(macOS)
|
||
let notification = NSApplication.willResignActiveNotification
|
||
#endif
|
||
|
||
// We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
|
||
// system will clean this up the next time it would be posted to.
|
||
// See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
|
||
// And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
|
||
// swiftlint:disable:next discarded_notification_center_observer
|
||
center.addObserver(forName: notification, object: nil, queue: nil, using: self.saveContextOnResignActive)
|
||
}
|
||
|
||
func saveContextOnResignActive(_ notification: Notification) {
|
||
saveContext()
|
||
}
|
||
|
||
}
|