mastodon-ios/Mastodon/Scene/HomeTimeline/HomeTimelineViewModel+LoadL...

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2021-02-07 07:42:50 +01:00
//
// HomeTimelineViewModel+LoadLatestState.swift
// Mastodon
//
// Created by sxiaojian on 2021/2/5.
//
import os.log
import func QuartzCore.CACurrentMediaTime
import Foundation
import CoreData
import CoreDataStack
import GameplayKit
extension HomeTimelineViewModel {
class LoadLatestState: GKState {
weak var viewModel: HomeTimelineViewModel?
init(viewModel: HomeTimelineViewModel) {
self.viewModel = viewModel
}
override func didEnter(from previousState: GKState?) {
os_log("%{public}s[%{public}ld], %{public}s: enter %s, previous: %s", ((#file as NSString).lastPathComponent), #line, #function, self.debugDescription, previousState.debugDescription)
viewModel?.loadLatestStateMachinePublisher.send(self)
}
}
}
extension HomeTimelineViewModel.LoadLatestState {
class Initial: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self
}
}
class Loading: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Fail.self || stateClass == Idle.self
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
guard let activeMastodonAuthenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
// sign out when loading will enter here
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stateMachine.enter(Fail.self)
return
}
let predicate = viewModel.fetchedResultsController.fetchRequest.predicate
let parentManagedObjectContext = viewModel.fetchedResultsController.managedObjectContext
let managedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
managedObjectContext.parent = parentManagedObjectContext
managedObjectContext.perform {
let start = CACurrentMediaTime()
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let latestStatusIDs: [Status.ID]
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let request = HomeTimelineIndex.sortedFetchRequest
request.returnsObjectsAsFaults = false
request.predicate = predicate
do {
let timelineIndexes = try managedObjectContext.fetch(request)
let endFetch = CACurrentMediaTime()
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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latestStatusIDs = timelineIndexes
.prefix(APIService.onceRequestStatusMaxCount) // avoid performance issue
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.compactMap { timelineIndex in
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timelineIndex.value(forKeyPath: #keyPath(HomeTimelineIndex.status.id)) as? Status.ID
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}
} catch {
stateMachine.enter(Fail.self)
return
}
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let end = CACurrentMediaTime()
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: collect statuses id cost: %.2fs", ((#file as NSString).lastPathComponent), #line, #function, end - start)
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// TODO: only set large count when using Wi-Fi
viewModel.context.apiService.homeTimeline(domain: activeMastodonAuthenticationBox.domain, authorizationBox: activeMastodonAuthenticationBox)
.receive(on: DispatchQueue.main)
.sink { completion in
viewModel.homeTimelineNavigationBarTitleViewModel.receiveLoadingStateCompletion(completion)
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switch completion {
case .failure(let error):
// TODO: handle error
viewModel.isFetchingLatestTimeline.value = false
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: fetch statuses failed. %s", ((#file as NSString).lastPathComponent), #line, #function, error.localizedDescription)
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case .finished:
// handle isFetchingLatestTimeline in fetch controller delegate
break
}
stateMachine.enter(Idle.self)
} receiveValue: { response in
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// stop refresher if no new statuses
let statuses = response.value
let newStatuses = statuses.filter { !latestStatusIDs.contains($0.id) }
os_log("%{public}s[%{public}ld], %{public}s: load %{public}ld new statuses", ((#file as NSString).lastPathComponent), #line, #function, newStatuses.count)
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if newStatuses.isEmpty {
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viewModel.isFetchingLatestTimeline.value = false
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} else {
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if !latestStatusIDs.isEmpty {
viewModel.homeTimelineNavigationBarTitleViewModel.newPostsIncoming()
}
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}
}
.store(in: &viewModel.disposeBag)
}
}
}
class Fail: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self || stateClass == Idle.self
}
}
class Idle: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self
}
}
}