98 lines
2.6 KiB
Swift
98 lines
2.6 KiB
Swift
//
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// FeedMetadataFile.swift
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// Account
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//
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// Created by Maurice Parker on 9/13/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import os.log
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import RSCore
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final class FeedMetadataFile {
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private var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "feedMetadataFile")
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private let fileURL: URL
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private let account: Account
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private lazy var managedFile = ManagedResourceFile(fileURL: fileURL, load: loadCallback, save: saveCallback)
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init(filename: String, account: Account) {
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self.fileURL = URL(fileURLWithPath: filename)
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self.account = account
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}
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func markAsDirty() {
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managedFile.markAsDirty()
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}
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func load() {
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managedFile.load()
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}
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func save() {
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managedFile.saveIfNecessary()
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}
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}
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private extension FeedMetadataFile {
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func loadCallback() {
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let errorPointer: NSErrorPointer = nil
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let fileCoordinator = NSFileCoordinator(filePresenter: managedFile)
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fileCoordinator.coordinate(readingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { readURL in
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if let fileData = try? Data(contentsOf: readURL) {
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let decoder = PropertyListDecoder()
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account.feedMetadata = (try? decoder.decode(Account.FeedMetadataDictionary.self, from: fileData)) ?? Account.FeedMetadataDictionary()
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}
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account.feedMetadata.values.forEach { $0.delegate = account }
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if !account.startingUp {
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account.resetFeedMetadataAndUnreadCounts()
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}
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})
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if let error = errorPointer?.pointee {
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os_log(.error, log: log, "Read from disk coordination failed: %@.", error.localizedDescription)
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}
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}
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func saveCallback() {
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guard !account.isDeleted else { return }
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let feedMetadata = metadataForOnlySubscribedToFeeds()
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let encoder = PropertyListEncoder()
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encoder.outputFormat = .binary
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let errorPointer: NSErrorPointer = nil
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let fileCoordinator = NSFileCoordinator(filePresenter: managedFile)
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fileCoordinator.coordinate(writingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { writeURL in
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do {
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let data = try encoder.encode(feedMetadata)
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try data.write(to: writeURL)
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} catch let error as NSError {
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os_log(.error, log: log, "Save to disk failed: %@.", error.localizedDescription)
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}
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})
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if let error = errorPointer?.pointee {
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os_log(.error, log: log, "Save to disk coordination failed: %@.", error.localizedDescription)
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}
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}
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private func metadataForOnlySubscribedToFeeds() -> Account.FeedMetadataDictionary {
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let feedIDs = account.idToFeedDictionary.keys
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return account.feedMetadata.filter { (feedID: String, metadata: FeedMetadata) -> Bool in
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return feedIDs.contains(metadata.feedID)
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}
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}
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}
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