85 lines
3.4 KiB
Swift
85 lines
3.4 KiB
Swift
//
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// StatusPrefetchingService.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-3-10.
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//
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import os.log
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import Foundation
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import Combine
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import CoreData
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import CoreDataStack
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import MastodonSDK
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final class StatusPrefetchingService {
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typealias TaskID = String
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let workingQueue = DispatchQueue(label: "org.joinmastodon.app.StatusPrefetchingService.working-queue")
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var disposeBag = Set<AnyCancellable>()
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private(set) var statusPrefetchingDisposeBagDict: [TaskID: AnyCancellable] = [:]
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weak var apiService: APIService?
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init(apiService: APIService) {
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self.apiService = apiService
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}
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}
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extension StatusPrefetchingService {
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func prefetchReplyTo(
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domain: String,
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statusObjectID: NSManagedObjectID,
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statusID: Mastodon.Entity.Status.ID,
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replyToStatusID: Mastodon.Entity.Status.ID,
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authorizationBox: AuthenticationService.MastodonAuthenticationBox
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) {
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workingQueue.async { [weak self] in
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guard let self = self, let apiService = self.apiService else { return }
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let taskID = domain + "@" + statusID + "->" + replyToStatusID
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guard self.statusPrefetchingDisposeBagDict[taskID] == nil else { return }
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: prefetching replyTo: %s", ((#file as NSString).lastPathComponent), #line, #function, taskID)
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self.statusPrefetchingDisposeBagDict[taskID] = apiService.status(
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domain: domain,
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statusID: replyToStatusID,
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authorizationBox: authorizationBox
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)
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.sink(receiveCompletion: { [weak self] completion in
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// remove task when completed
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guard let self = self else { return }
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: prefeched replyTo: %s", ((#file as NSString).lastPathComponent), #line, #function, taskID)
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self.statusPrefetchingDisposeBagDict[taskID] = nil
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}, receiveValue: { [weak self] _ in
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guard let self = self else { return }
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let backgroundManagedObjectContext = apiService.backgroundManagedObjectContext
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backgroundManagedObjectContext.performChanges {
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guard let status = backgroundManagedObjectContext.object(with: statusObjectID) as? Status else { return }
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do {
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let predicate = Status.predicate(domain: domain, id: replyToStatusID)
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let request = Status.sortedFetchRequest
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request.predicate = predicate
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request.returnsObjectsAsFaults = false
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request.fetchLimit = 1
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guard let replyTo = try backgroundManagedObjectContext.fetch(request).first else { return }
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status.update(replyTo: replyTo)
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} catch {
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assertionFailure(error.localizedDescription)
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}
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}
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.sink { _ in
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: update status replyTo: %s", ((#file as NSString).lastPathComponent), #line, #function, taskID)
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} receiveValue: { _ in
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// do nothing
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}
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.store(in: &self.disposeBag)
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})
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}
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}
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}
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