151 lines
4.8 KiB
Swift
151 lines
4.8 KiB
Swift
//
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// FeedlySyncStarredArticlesOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 15/10/19.
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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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final class FeedlySyncStarredArticlesOperation: FeedlyOperation, FeedlyOperationDelegate, FeedlyGetStreamContentsOperationDelegate, FeedlyCheckpointOperationDelegate {
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private let account: Account
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private let operationQueue: OperationQueue
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private let service: FeedlyGetStreamContentsService
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private let log: OSLog
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private let setStatuses: FeedlySetStarredArticlesOperation
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private let finishOperation: FeedlyCheckpointOperation
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/// Buffers every starred/saved entry from every page.
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private class StarredEntryProvider: FeedlyEntryProviding, FeedlyStarredEntryIdProviding, FeedlyParsedItemProviding {
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var resource: FeedlyResourceId
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private(set) var parsedEntries = Set<ParsedItem>()
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private(set) var entries = [FeedlyEntry]()
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init(resource: FeedlyResourceId) {
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self.resource = resource
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}
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func addEntries(from provider: FeedlyEntryProviding & FeedlyParsedItemProviding) {
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entries.append(contentsOf: provider.entries)
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parsedEntries.formUnion(provider.parsedEntries)
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}
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var entryIds: Set<String> {
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return Set(entries.map { $0.id })
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}
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}
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private let entryProvider: StarredEntryProvider
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convenience init(account: Account, credentials: Credentials, service: FeedlyGetStreamContentsService, log: OSLog) {
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let saved = FeedlyTagResourceId.Global.saved(for: credentials.username)
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self.init(account: account, resource: saved, service: service, log: log)
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}
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init(account: Account, resource: FeedlyResourceId, service: FeedlyGetStreamContentsService, log: OSLog) {
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self.account = account
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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.finishOperation = FeedlyCheckpointOperation()
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self.log = log
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let provider = StarredEntryProvider(resource: resource)
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self.entryProvider = provider
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self.setStatuses = FeedlySetStarredArticlesOperation(account: account,
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allStarredEntryIdsProvider: provider,
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log: log)
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super.init()
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let getFirstPage = FeedlyGetStreamContentsOperation(account: account,
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resource: resource,
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service: service,
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newerThan: nil,
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log: log)
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let organiseByFeed = FeedlyOrganiseParsedItemsByFeedOperation(account: account,
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parsedItemProvider: provider,
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log: log)
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let updateAccount = FeedlyUpdateAccountFeedsWithItemsOperation(account: account,
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organisedItemsProvider: organiseByFeed,
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log: log)
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getFirstPage.delegate = self
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getFirstPage.streamDelegate = self
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setStatuses.addDependency(getFirstPage)
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setStatuses.delegate = self
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organiseByFeed.addDependency(setStatuses)
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organiseByFeed.delegate = self
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updateAccount.addDependency(organiseByFeed)
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updateAccount.delegate = self
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finishOperation.checkpointDelegate = self
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finishOperation.addDependency(updateAccount)
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let operations = [getFirstPage, setStatuses, organiseByFeed, updateAccount, 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 starred articles")
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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 feedlyGetStreamContentsOperation(_ operation: FeedlyGetStreamContentsOperation, didGetContentsOf stream: FeedlyStream) {
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guard !isCancelled else {
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os_log(.debug, log: log, "Cancelled starred stream contents for %@", stream.id)
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return
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}
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entryProvider.addEntries(from: operation)
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os_log(.debug, log: log, "Collecting %i items from %@", stream.items.count, stream.id)
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guard let continuation = stream.continuation else {
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return
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}
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let nextPageOperation = FeedlyGetStreamContentsOperation(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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log: log)
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nextPageOperation.delegate = self
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nextPageOperation.streamDelegate = 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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os_log(.debug, log: log, "%{public}@ failing and cancelling other operations because %{public}@.", operation, error.localizedDescription)
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operationQueue.cancelAllOperations()
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didFinish(error)
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}
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}
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