132 lines
4.3 KiB
Swift
132 lines
4.3 KiB
Swift
//
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// FeedlySyncUnreadStatusesOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 18/10/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import os.log
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import RSParser
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/// Makes one or more requests to get the complete set of unread article ids to update the status of those articles *for the entire account.*
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final class FeedlySyncUnreadStatusesOperation: FeedlyOperation, FeedlyOperationDelegate, FeedlyGetStreamIdsOperationDelegate, FeedlyCheckpointOperationDelegate {
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private let account: Account
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private let resource: FeedlyResourceId
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private let operationQueue: OperationQueue
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private let service: FeedlyGetStreamIdsService
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private let log: OSLog
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/// Buffers every unread article id from every page of the resource's stream.
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private class UnreadEntryIdsProvider: FeedlyUnreadEntryIdProviding {
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let resource: FeedlyResourceId
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private(set) var entryIds = Set<String>()
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init(resource: FeedlyResourceId) {
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self.resource = resource
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}
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func addEntryIds(from provider: FeedlyEntryIdenifierProviding) {
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entryIds.formUnion(provider.entryIds)
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}
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}
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private let unreadEntryIdsProvider: UnreadEntryIdsProvider
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private let setStatuses: FeedlySetUnreadArticlesOperation
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convenience init(account: Account, credentials: Credentials, service: FeedlyGetStreamIdsService, newerThan: Date?, log: OSLog) {
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let resource = FeedlyCategoryResourceId.Global.all(for: credentials.username)
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self.init(account: account, resource: resource, service: service, newerThan: newerThan, log: log)
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}
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init(account: Account, resource: FeedlyResourceId, service: FeedlyGetStreamIdsService, newerThan: Date?, log: OSLog) {
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self.account = account
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self.resource = resource
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self.service = service
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self.operationQueue = OperationQueue()
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self.operationQueue.isSuspended = true
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self.log = log
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let provider = UnreadEntryIdsProvider(resource: resource)
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self.unreadEntryIdsProvider = provider
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self.setStatuses = FeedlySetUnreadArticlesOperation(account: account,
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allUnreadIdsProvider: unreadEntryIdsProvider,
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log: log)
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super.init()
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let getFirstPageOfUnreadIds = FeedlyGetStreamIdsOperation(account: account,
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resource: resource,
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service: service,
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newerThan: nil,
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unreadOnly: true,
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log: log)
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getFirstPageOfUnreadIds.delegate = self
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getFirstPageOfUnreadIds.streamIdsDelegate = self
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setStatuses.addDependency(getFirstPageOfUnreadIds)
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setStatuses.delegate = self
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let finishOperation = FeedlyCheckpointOperation()
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finishOperation.checkpointDelegate = self
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finishOperation.addDependency(setStatuses)
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let operations = [getFirstPageOfUnreadIds, setStatuses, finishOperation]
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operationQueue.addOperations(operations, waitUntilFinished: false)
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}
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override func cancel() {
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os_log(.debug, log: log, "Canceling sync unread statuses")
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operationQueue.cancelAllOperations()
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super.cancel()
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didFinish()
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}
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override func main() {
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guard !isCancelled else {
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// override of cancel calls didFinish().
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return
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}
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operationQueue.isSuspended = false
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}
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func feedlyGetStreamIdsOperation(_ operation: FeedlyGetStreamIdsOperation, didGet streamIds: FeedlyStreamIds) {
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guard !isCancelled else {
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os_log(.debug, log: log, "Cancelled unread stream ids.")
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return
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}
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os_log(.debug, log: log, "Collecting %i unread article ids from %@", streamIds.ids.count, resource.id)
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unreadEntryIdsProvider.addEntryIds(from: operation)
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guard let continuation = streamIds.continuation else {
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return
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}
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let nextPageOperation = FeedlyGetStreamIdsOperation(account: operation.account,
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resource: operation.resource,
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service: operation.service,
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continuation: continuation,
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newerThan: operation.newerThan,
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unreadOnly: operation.unreadOnly,
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log: log)
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nextPageOperation.delegate = self
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nextPageOperation.streamIdsDelegate = self
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setStatuses.addDependency(nextPageOperation)
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operationQueue.addOperation(nextPageOperation)
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}
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func feedlyCheckpointOperationDidReachCheckpoint(_ operation: FeedlyCheckpointOperation) {
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didFinish()
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}
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func feedlyOperation(_ operation: FeedlyOperation, didFailWith error: Error) {
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operationQueue.cancelAllOperations()
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didFinish(error)
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}
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}
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