NetNewsWire/iOS/CommonExtension/ExtensionContainersFile.swift

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//
// ExtensionContainersFile.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 2/10/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import Foundation
import os.log
import RSCore
import RSParser
import Account
final class ExtensionContainersFile {
private static var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "extensionContainersFile")
private static var filePath: String = {
let appGroup = Bundle.main.object(forInfoDictionaryKey: "AppGroup") as! String
let containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup)
return containerURL!.appendingPathComponent("extension_containers.plist").path
}()
private var isDirty = false {
didSet {
queueSaveToDiskIfNeeded()
}
}
private let saveQueue = CoalescingQueue(name: "Save Queue", interval: 0.5)
init() {
if !FileManager.default.fileExists(atPath: ExtensionContainersFile.filePath) {
save()
}
NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .UserDidAddAccount, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .UserDidDeleteAccount, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .AccountStateDidChange, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .ChildrenDidChange, object: nil)
}
/// Reads and decodes the shared plist file.
static func read() -> ExtensionContainers? {
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator()
let fileURL = URL(fileURLWithPath: ExtensionContainersFile.filePath)
var extensionContainers: ExtensionContainers? = nil
fileCoordinator.coordinate(readingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { readURL in
if let fileData = try? Data(contentsOf: readURL) {
let decoder = PropertyListDecoder()
extensionContainers = try? decoder.decode(ExtensionContainers.self, from: fileData)
}
})
if let error = errorPointer?.pointee {
os_log(.error, log: log, "Read from disk coordination failed: %@.", error.localizedDescription)
}
return extensionContainers
}
}
private extension ExtensionContainersFile {
@objc func markAsDirty() {
isDirty = true
}
func queueSaveToDiskIfNeeded() {
saveQueue.add(self, #selector(saveToDiskIfNeeded))
}
@objc func saveToDiskIfNeeded() {
if isDirty {
isDirty = false
save()
}
}
func save() {
let encoder = PropertyListEncoder()
encoder.outputFormat = .binary
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator()
let fileURL = URL(fileURLWithPath: ExtensionContainersFile.filePath)
fileCoordinator.coordinate(writingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { writeURL in
do {
let extensionAccounts = AccountManager.shared.sortedActiveAccounts.map { ExtensionAccount(account: $0) }
let extensionContainers = ExtensionContainers(accounts: extensionAccounts)
let data = try encoder.encode(extensionContainers)
try data.write(to: writeURL)
} catch let error as NSError {
os_log(.error, log: Self.log, "Save to disk failed: %@.", error.localizedDescription)
}
})
if let error = errorPointer?.pointee {
os_log(.error, log: Self.log, "Save to disk coordination failed: %@.", error.localizedDescription)
}
}
}