frenzy-ios/Reader/FervorController.swift

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//
// FervorController.swift
// Reader
//
// Created by Shadowfacts on 11/25/21.
//
@preconcurrency import Foundation
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import Fervor
@preconcurrency import OSLog
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import Combine
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actor FervorController {
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static let oauthRedirectURI = URL(string: "frenzy://oauth-callback")!
let instanceURL: URL
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private let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "FervorController")
let client: FervorClient
nonisolated let account: LocalData.Account?
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private(set) var clientID: String?
private(set) var clientSecret: String?
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private(set) var token: Token?
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nonisolated let persistentContainer: PersistentContainer!
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nonisolated let syncState = PassthroughSubject<SyncState, Never>()
private var lastSyncState = SyncState.done
private var cancellables = Set<AnyCancellable>()
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init(instanceURL: URL, account: LocalData.Account?) async {
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self.instanceURL = instanceURL
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self.client = FervorClient(instanceURL: instanceURL, accessToken: account?.token.accessToken)
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self.account = account
self.clientID = account?.clientID
self.clientSecret = account?.clientSecret
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if let account = account {
self.persistentContainer = PersistentContainer(account: account)
} else {
self.persistentContainer = nil
}
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persistentContainer?.fervorController = self
}
convenience init(account: LocalData.Account) async {
await self.init(instanceURL: account.instanceURL, account: account)
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}
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private func setSyncState(_ state: SyncState) {
lastSyncState = state
syncState.send(state)
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}
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func register() async throws -> ClientRegistration {
let registration = try await client.register(clientName: "Frenzy iOS", website: nil, redirectURI: FervorController.oauthRedirectURI)
clientID = registration.clientID
clientSecret = registration.clientSecret
return registration
}
func getToken(authCode: String) async throws {
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token = try await client.token(authCode: authCode, redirectURI: FervorController.oauthRedirectURI, clientID: clientID!, clientSecret: clientSecret!)
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}
func syncAll() async throws {
guard lastSyncState == .done else {
return
}
// always return to .done, even if we throw and stop syncing early
defer { setSyncState(.done) }
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setSyncState(.groupsAndFeeds)
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logger.info("Syncing groups and feeds")
async let groups = try client.groups()
async let feeds = try client.feeds()
try await persistentContainer.sync(serverGroups: groups, serverFeeds: feeds)
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setSyncState(.items)
let lastSync = try await persistentContainer.lastSyncDate()
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logger.info("Syncing items with last sync date: \(String(describing: lastSync), privacy: .public)")
let update = try await client.syncItems(lastSync: lastSync)
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try await persistentContainer.syncItems(update, setSyncState: setSyncState(_:))
try await persistentContainer.updateLastSyncDate(update.syncTimestamp)
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setSyncState(.excerpts)
await ExcerptGenerator.generateAll(self)
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}
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@MainActor
func syncReadToServer() async {
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var count = 0
// try to sync items which failed last time
let req = Item.fetchRequest()
req.predicate = NSPredicate(format: "needsReadStateSync = YES")
if var needsSync = try? persistentContainer.viewContext.fetch(req) {
let firstReadIndex = needsSync.partition(by: \.read)
let unreadIDs = needsSync[..<firstReadIndex].map(\.id.unsafelyUnwrapped)
let readIDs = needsSync[firstReadIndex...].map(\.id.unsafelyUnwrapped)
var updatedIDs = Set<FervorID>()
if !unreadIDs.isEmpty {
do {
let ids = try await client.unread(ids: unreadIDs)
updatedIDs.formUnion(ids)
} catch {
logger.error("Failed to sync unread state: \(String(describing: error), privacy: .public)")
}
}
if !readIDs.isEmpty {
do {
let ids = try await client.read(ids: readIDs)
updatedIDs.formUnion(ids)
} catch {
logger.error("Failed to sync read state: \(String(describing: error), privacy: .public)")
}
}
count += updatedIDs.count
for item in needsSync where updatedIDs.contains(item.id!) {
item.needsReadStateSync = false
}
}
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logger.info("Synced \(count, privacy: .public) read/unread to server")
do {
try persistentContainer.viewContext.save()
} catch {
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logger.error("Failed to save view context: \(String(describing: error), privacy: .public)")
}
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}
@MainActor
func markItem(_ item: Item, read: Bool) async {
item.read = read
do {
let f = read ? client.read(item:) : client.unread(item:)
_ = try await f(item.id!)
item.needsReadStateSync = false
} catch {
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logger.error("Failed to mark item (un)read: \(String(describing: error), privacy: .public)")
item.needsReadStateSync = true
}
do {
try self.persistentContainer.saveViewContext()
} catch {
logger.error("Failed to save view context: \(String(describing: error), privacy: .public)")
}
}
@MainActor
func fetchItem(id: String) async throws -> Item? {
guard let serverItem = try await client.item(id: id) else {
return nil
}
let item = Item(context: persistentContainer.viewContext)
item.updateFromServer(serverItem)
try persistentContainer.saveViewContext()
return item
}
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}
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extension FervorController {
enum SyncState: Equatable {
case groupsAndFeeds
case items
case updateItems(current: Int, total: Int)
case excerpts
case done
}
}