129 lines
5.9 KiB
Swift
129 lines
5.9 KiB
Swift
//
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// HomeTimelineViewModel+LoadLatestState.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/2/5.
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//
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import os.log
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import func QuartzCore.CACurrentMediaTime
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import Foundation
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import CoreData
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import CoreDataStack
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import GameplayKit
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extension HomeTimelineViewModel {
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class LoadLatestState: GKState {
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weak var viewModel: HomeTimelineViewModel?
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init(viewModel: HomeTimelineViewModel) {
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self.viewModel = viewModel
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}
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override func didEnter(from previousState: GKState?) {
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os_log("%{public}s[%{public}ld], %{public}s: enter %s, previous: %s", ((#file as NSString).lastPathComponent), #line, #function, self.debugDescription, previousState.debugDescription)
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viewModel?.loadLatestStateMachinePublisher.send(self)
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}
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}
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}
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extension HomeTimelineViewModel.LoadLatestState {
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class Initial: HomeTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self
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}
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}
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class Loading: HomeTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Fail.self || stateClass == Idle.self
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
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guard let activeMastodonAuthenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
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// sign out when loading will enter here
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stateMachine.enter(Fail.self)
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return
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}
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let predicate = viewModel.fetchedResultsController.fetchRequest.predicate
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let parentManagedObjectContext = viewModel.fetchedResultsController.managedObjectContext
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let managedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
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managedObjectContext.parent = parentManagedObjectContext
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managedObjectContext.perform {
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let start = CACurrentMediaTime()
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let latestTootIDs: [Toot.ID]
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let request = HomeTimelineIndex.sortedFetchRequest
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request.returnsObjectsAsFaults = false
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request.predicate = predicate
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do {
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let timelineIndexes = try managedObjectContext.fetch(request)
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let endFetch = CACurrentMediaTime()
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: collect timelineIndexes cost: %.2fs", ((#file as NSString).lastPathComponent), #line, #function, endFetch - start)
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latestTootIDs = timelineIndexes
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.prefix(APIService.onceRequestTootMaxCount) // avoid performance issue
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.compactMap { timelineIndex in
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timelineIndex.value(forKeyPath: #keyPath(HomeTimelineIndex.toot.id)) as? Toot.ID
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}
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} catch {
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stateMachine.enter(Fail.self)
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return
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}
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let end = CACurrentMediaTime()
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: collect toots id cost: %.2fs", ((#file as NSString).lastPathComponent), #line, #function, end - start)
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// TODO: only set large count when using Wi-Fi
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viewModel.context.apiService.homeTimeline(domain: activeMastodonAuthenticationBox.domain, authorizationBox: activeMastodonAuthenticationBox)
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.receive(on: DispatchQueue.main)
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.sink { completion in
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viewModel.homeTimelineNavigationBarTitleViewModel.receiveLoadingStateCompletion(completion)
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switch completion {
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case .failure(let error):
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// TODO: handle error
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viewModel.isFetchingLatestTimeline.value = false
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: fetch toots failed. %s", ((#file as NSString).lastPathComponent), #line, #function, error.localizedDescription)
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case .finished:
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// handle isFetchingLatestTimeline in fetch controller delegate
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break
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}
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stateMachine.enter(Idle.self)
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} receiveValue: { response in
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// stop refresher if no new toots
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let toots = response.value
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let newToots = toots.filter { !latestTootIDs.contains($0.id) }
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os_log("%{public}s[%{public}ld], %{public}s: load %{public}ld new toots", ((#file as NSString).lastPathComponent), #line, #function, newToots.count)
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if newToots.isEmpty {
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viewModel.isFetchingLatestTimeline.value = false
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} else {
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if !latestTootIDs.isEmpty {
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viewModel.homeTimelineNavigationBarTitleViewModel.newPostsIncoming()
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}
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}
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}
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.store(in: &viewModel.disposeBag)
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}
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}
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}
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class Fail: HomeTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self || stateClass == Idle.self
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}
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}
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class Idle: HomeTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self
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}
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}
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}
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