NetNewsWire/Frameworks/Account/Feedly/Operations/FeedlySendArticleStatusesOp...

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//
// FeedlySendArticleStatusesOperation.swift
// Account
//
// Created by Kiel Gillard on 14/10/19.
// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import Articles
import SyncDatabase
import os.log
/// Take changes to statuses of articles locally and apply them to the corresponding the articles remotely.
final class FeedlySendArticleStatusesOperation: FeedlyOperation {
private let database: SyncDatabase
private let log: OSLog
private let service: FeedlyMarkArticlesService
init(database: SyncDatabase, service: FeedlyMarkArticlesService, log: OSLog) {
self.database = database
self.service = service
self.log = log
}
override func run() {
os_log(.debug, log: log, "Sending article statuses...")
database.selectForProcessing { result in
if self.isCanceled {
self.didFinish()
return
}
switch result {
case .success(let syncStatuses):
self.processStatuses(syncStatuses)
case .failure:
self.didFinish()
}
}
}
}
private extension FeedlySendArticleStatusesOperation {
func processStatuses(_ pending: [SyncStatus]) {
let statuses: [(status: ArticleStatus.Key, flag: Bool, action: FeedlyMarkAction)] = [
(.read, false, .unread),
(.read, true, .read),
(.starred, true, .saved),
(.starred, false, .unsaved),
]
let group = DispatchGroup()
for pairing in statuses {
let articleIds = pending.filter { $0.key == pairing.status && $0.flag == pairing.flag }
guard !articleIds.isEmpty else {
continue
}
let ids = Set(articleIds.map { $0.articleID })
let database = self.database
group.enter()
service.mark(ids, as: pairing.action) { result in
assert(Thread.isMainThread)
switch result {
case .success:
database.deleteSelectedForProcessing(Array(ids)) { _ in
group.leave()
}
case .failure:
database.resetSelectedForProcessing(Array(ids)) { _ in
group.leave()
}
}
}
}
group.notify(queue: DispatchQueue.main) {
os_log(.debug, log: self.log, "Done sending article statuses.")
self.didFinish()
}
}
}