423 lines
15 KiB
Swift
423 lines
15 KiB
Swift
//
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// ArticlesTable.swift
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// Evergreen
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//
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// Created by Brent Simmons on 5/9/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import RSCore
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import RSDatabase
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import RSParser
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import Data
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final class ArticlesTable: DatabaseTable {
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let name: String
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private let accountID: String
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private let queue: RSDatabaseQueue
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private let statusesTable: StatusesTable
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private let authorsLookupTable: DatabaseLookupTable
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private let attachmentsLookupTable: DatabaseLookupTable
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private let tagsLookupTable: DatabaseLookupTable
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// TODO: update articleCutoffDate as time passes and based on user preferences.
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private var articleCutoffDate = NSDate.rs_dateWithNumberOfDays(inThePast: 3 * 31)!
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private var maximumArticleCutoffDate = NSDate.rs_dateWithNumberOfDays(inThePast: 4 * 31)!
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init(name: String, accountID: String, queue: RSDatabaseQueue) {
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self.name = name
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self.accountID = accountID
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self.queue = queue
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self.statusesTable = StatusesTable(queue: queue)
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let authorsTable = AuthorsTable(name: DatabaseTableName.authors)
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self.authorsLookupTable = DatabaseLookupTable(name: DatabaseTableName.authorsLookup, objectIDKey: DatabaseKey.articleID, relatedObjectIDKey: DatabaseKey.authorID, relatedTable: authorsTable, relationshipName: RelationshipName.authors)
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let tagsTable = TagsTable(name: DatabaseTableName.tags)
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self.tagsLookupTable = DatabaseLookupTable(name: DatabaseTableName.tags, objectIDKey: DatabaseKey.articleID, relatedObjectIDKey: DatabaseKey.tagName, relatedTable: tagsTable, relationshipName: RelationshipName.tags)
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let attachmentsTable = AttachmentsTable(name: DatabaseTableName.attachments)
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self.attachmentsLookupTable = DatabaseLookupTable(name: DatabaseTableName.attachmentsLookup, objectIDKey: DatabaseKey.articleID, relatedObjectIDKey: DatabaseKey.attachmentID, relatedTable: attachmentsTable, relationshipName: RelationshipName.attachments)
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}
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// MARK: Fetching
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func fetchArticles(_ feed: Feed) -> Set<Article> {
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let feedID = feed.feedID
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var articles = Set<Article>()
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queue.fetchSync { (database) in
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articles = self.fetchArticlesForFeedID(feedID, withLimits: true, database: database)
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}
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return articles
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}
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func fetchArticlesAsync(_ feed: Feed, withLimits: Bool, _ resultBlock: @escaping ArticleResultBlock) {
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let feedID = feed.feedID
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queue.fetch { (database) in
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let articles = self.fetchArticlesForFeedID(feedID, withLimits: withLimits, database: database)
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DispatchQueue.main.async {
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resultBlock(articles)
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}
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}
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}
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func fetchUnreadArticles(for feeds: Set<Feed>) -> Set<Article> {
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return fetchUnreadArticles(feeds.feedIDs())
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}
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// MARK: Updating
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func update(_ feed: Feed, _ parsedFeed: ParsedFeed, _ completion: @escaping UpdateArticlesWithFeedCompletionBlock) {
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if parsedFeed.items.isEmpty {
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completion(nil, nil)
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return
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}
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// 1. Create incoming articles with parsedItems.
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// 2. Ensure statuses for all the incoming articles.
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// 3. Ignore incoming articles that are userDeleted || (!starred and really old)
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// 4. Fetch all articles for the feed.
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// 5. Create array of Articles not in database and save them.
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// 6. Create array of updated Articles and save what’s changed.
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// 7. Call back with new and updated Articles.
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let feedID = feed.feedID
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self.queue.run { (database) in
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// This doesn’t hit the database, but it should be done on the database queue.
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let allIncomingArticles = Article.articlesWithParsedItems(parsedFeed.items, self.accountID, feedID) //1
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if allIncomingArticles.isEmpty {
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self.callUpdateArticlesCompletionBlock(nil, nil, completion)
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return
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}
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DispatchQueue.main.async {
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self.ensureStatusesAndSaveArticles(allIncomingArticles, feedID, completion) //2-7
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}
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}
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}
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// MARK: Unread Counts
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func fetchUnreadCounts(_ feeds: Set<Feed>, _ completion: @escaping UnreadCountCompletionBlock) {
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let feedIDs = feeds.feedIDs()
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var unreadCountTable = UnreadCountTable()
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queue.fetch { (database) in
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for feedID in feedIDs {
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unreadCountTable[feedID] = self.fetchUnreadCount(feedID, database)
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}
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DispatchQueue.main.async() {
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completion(unreadCountTable)
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}
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}
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}
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// MARK: Status
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func mark(_ articles: Set<Article>, _ statusKey: String, _ flag: Bool) {
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// Sets flag in both memory and in database.
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// let articleIDs = articles.flatMap { (article) -> String? in
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//
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// guard let status = article.status else {
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// assertionFailure("Each article must have a status.")
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// return nil
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// }
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//
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// if status.boolStatus(forKey: statusKey) == flag {
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// return nil
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// }
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// status.setBoolStatus(flag, forKey: statusKey)
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// return article.articleID
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// }
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//
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// if articleIDs.isEmpty {
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// return
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// }
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//
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// // TODO: statusesTable needs to cache status changes.
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// queue.update { (database) in
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// self.statusesTable.markArticleIDs(Set(articleIDs), statusKey, flag, database)
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// }
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}
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}
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// MARK: - Private
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private extension ArticlesTable {
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// MARK: Fetching
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func articleWithRow(_ row: FMResultSet) -> Article? {
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guard let article = Article(row: row, accountID: accountID) else {
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return nil
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}
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// Note: the row is a result of a JOIN query with the statuses table,
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// so we can get the status at the same time and avoid additional database lookups.
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article.status = statusesTable.statusWithRow(row)
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return article
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}
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func articlesWithResultSet(_ resultSet: FMResultSet, _ database: FMDatabase) -> Set<Article> {
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let articles = resultSet.mapToSet(articleWithRow)
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attachRelatedObjects(articles, database)
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return articles
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}
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func fetchArticlesWithWhereClause(_ database: FMDatabase, whereClause: String, parameters: [AnyObject], withLimits: Bool) -> Set<Article> {
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// Don’t fetch articles that shouldn’t appear in the UI. The rules:
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// * Must not be deleted.
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// * Must be either 1) starred or 2) dateArrived must be newer than cutoff date.
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let sql = withLimits ? "select * from articles natural join statuses where \(whereClause) and userDeleted=0 and (starred=1 or dateArrived>?);" : "select * from articles natural join statuses where \(whereClause);"
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return articlesWithSQL(sql, parameters + [articleCutoffDate as AnyObject], database)
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}
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func fetchUnreadCount(_ feedID: String, _ database: FMDatabase) -> Int {
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// Count only the articles that would appear in the UI.
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// * Must be unread.
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// * Must not be deleted.
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// * Must be either 1) starred or 2) dateArrived must be newer than cutoff date.
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let sql = "select count(*) from articles natural join statuses where feedID=? and read=0 and userDeleted=0 and (starred=1 or dateArrived>?);"
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return numberWithSQLAndParameters(sql, [feedID, articleCutoffDate], in: database)
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}
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func fetchArticlesForFeedID(_ feedID: String, withLimits: Bool, database: FMDatabase) -> Set<Article> {
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return fetchArticlesWithWhereClause(database, whereClause: "articles.feedID = ?", parameters: [feedID as AnyObject], withLimits: withLimits)
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}
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func fetchUnreadArticles(_ feedIDs: Set<String>) -> Set<Article> {
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if feedIDs.isEmpty {
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return Set<Article>()
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}
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var articles = Set<Article>()
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queue.fetchSync { (database) in
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// select * from articles natural join statuses where feedID in ('http://ranchero.com/xml/rss.xml') and read=0
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let parameters = feedIDs.map { $0 as AnyObject }
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let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(feedIDs.count))!
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let whereClause = "feedID in \(placeholders) and read=0"
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articles = self.fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: true)
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}
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return articles
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}
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func articlesWithSQL(_ sql: String, _ parameters: [AnyObject], _ database: FMDatabase) -> Set<Article> {
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guard let resultSet = database.executeQuery(sql, withArgumentsIn: parameters) else {
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return Set<Article>()
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}
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return articlesWithResultSet(resultSet, database)
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}
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// MARK: Saving Parsed Items
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private func ensureStatusesAndSaveArticles(_ allIncomingArticles: Set<Article>, _ feedID: String, _ completion: @escaping UpdateArticlesWithFeedCompletionBlock) {
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statusesTable.ensureStatusesForArticleIDs(allIncomingArticles.articleIDs()) { (statusesDictionary) in // 2
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self.queue.update{ (database) in
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self.saveArticlesWithDatabase(allIncomingArticles, statusesDictionary, feedID, database, completion)
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}
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}
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}
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private func saveArticlesWithDatabase(_ allIncomingArticles: Set<Article>, _ statusesDictionary: [String: ArticleStatus], _ feedID: String, _ database: FMDatabase, _ completion: @escaping UpdateArticlesWithFeedCompletionBlock) { // 3-7
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let incomingArticles = filterIncomingArticles(allIncomingArticles, statusesDictionary) //3
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if incomingArticles.isEmpty {
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callUpdateArticlesCompletionBlock(nil, nil, completion)
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return
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}
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let fetchedArticles = fetchArticlesForFeedID(feedID, withLimits: false, database: database) //4
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let fetchedArticlesDictionary = fetchedArticles.dictionary()
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let newArticles = findAndSaveNewArticles(incomingArticles, fetchedArticlesDictionary, database) //5
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let updatedArticles = findAndSaveUpdatedArticles(incomingArticles, fetchedArticlesDictionary, database) //6
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callUpdateArticlesCompletionBlock(newArticles, updatedArticles, completion)
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}
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func callUpdateArticlesCompletionBlock(_ newArticles: Set<Article>?, _ updatedArticles: Set<Article>?, _ completion: @escaping UpdateArticlesWithFeedCompletionBlock) {
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DispatchQueue.main.async {
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completion(newArticles, updatedArticles)
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}
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}
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// MARK: Save New Articles
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func findNewArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article]) -> Set<Article>? {
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let newArticles = Set(incomingArticles.filter { fetchedArticlesDictionary[$0.articleID] == nil })
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return newArticles.isEmpty ? nil : newArticles
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}
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func findAndSaveNewArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article], _ database: FMDatabase) -> Set<Article>? { //5
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guard let newArticles = findNewArticles(incomingArticles, fetchedArticlesDictionary) else {
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return nil
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}
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self.saveNewArticles(newArticles, database)
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return newArticles
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}
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func saveNewArticles(_ articles: Set<Article>, _ database: FMDatabase) {
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saveRelatedObjectsForNewArticles(articles, database)
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if let databaseDictionaries = articles.databaseDictionaries() {
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insertRows(databaseDictionaries, insertType: .orReplace, in: database)
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}
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}
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func saveRelatedObjectsForNewArticles(_ articles: Set<Article>, _ database: FMDatabase) {
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let databaseObjects = articles.databaseObjects()
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authorsLookupTable.saveRelatedObjects(for: databaseObjects, in: database)
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attachmentsLookupTable.saveRelatedObjects(for: databaseObjects, in: database)
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tagsLookupTable.saveRelatedObjects(for: databaseObjects, in: database)
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}
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// MARK: Update Existing Articles
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func articlesWithRelatedObjectChanges<T>(_ comparisonKeyPath: KeyPath<Article, Set<T>?>, _ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article]) -> Set<Article> {
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return updatedArticles.filter{ (updatedArticle) -> Bool in
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if let fetchedArticle = fetchedArticles[updatedArticle.articleID] {
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return updatedArticle[keyPath: comparisonKeyPath] != fetchedArticle[keyPath: comparisonKeyPath]
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}
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assertionFailure("Expected to find matching fetched article.");
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return true
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}
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}
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func updateRelatedObjects<T>(_ comparisonKeyPath: KeyPath<Article, Set<T>?>, _ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ lookupTable: DatabaseLookupTable, _ database: FMDatabase) {
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let articlesWithChanges = articlesWithRelatedObjectChanges(comparisonKeyPath, updatedArticles, fetchedArticles)
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if !articlesWithChanges.isEmpty {
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lookupTable.saveRelatedObjects(for: articlesWithChanges.databaseObjects(), in: database)
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}
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}
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func saveUpdatedRelatedObjects(_ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
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updateRelatedObjects(\Article.tags, updatedArticles, fetchedArticles, tagsLookupTable, database)
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updateRelatedObjects(\Article.authors, updatedArticles, fetchedArticles, authorsLookupTable, database)
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updateRelatedObjects(\Article.attachments, updatedArticles, fetchedArticles, attachmentsLookupTable, database)
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}
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func findUpdatedArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article]) -> Set<Article>? {
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let updatedArticles = incomingArticles.filter{ (incomingArticle) -> Bool in //6
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if let existingArticle = fetchedArticlesDictionary[incomingArticle.articleID] {
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if existingArticle != incomingArticle {
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return true
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}
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}
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return false
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}
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return updatedArticles.isEmpty ? nil : updatedArticles
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}
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func findAndSaveUpdatedArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article], _ database: FMDatabase) -> Set<Article>? { //6
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guard let updatedArticles = findUpdatedArticles(incomingArticles, fetchedArticlesDictionary) else {
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return nil
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}
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saveUpdatedArticles(Set(updatedArticles), fetchedArticlesDictionary, database)
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return updatedArticles
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}
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func saveUpdatedArticles(_ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
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saveUpdatedRelatedObjects(updatedArticles, fetchedArticles, database)
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for updatedArticle in updatedArticles {
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saveUpdatedArticle(updatedArticle, fetchedArticles, database)
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}
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}
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func saveUpdatedArticle(_ updatedArticle: Article, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
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// Only update exactly what has changed in the Article (if anything).
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// Untested theory: this gets us better performance and less database fragmentation.
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guard let fetchedArticle = fetchedArticle[updatedArticle.articleID] else {
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assertionFailure("Expected to find matching fetched article.");
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saveNewArticles(Set([updatedArticle]), database)
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return
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}
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guard let changesDictionary = updatedArticle.changesFrom(fetchedArticle), !changesDictionary.isEmpty else {
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// Not unexpected. There may be no changes.
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return
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}
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updateRowsWithDictionary(changesDictionary, whereKey: DatabaseKey.articleID, matches: updatedArticle.articleID, database: database)
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}
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func statusIndicatesArticleIsIgnorable(_ status: ArticleStatus) -> Bool {
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// Ignorable articles: either userDeleted==1 or (not starred and arrival date > 4 months).
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if status.userDeleted {
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return true
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}
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if status.starred {
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return false
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}
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return status.dateArrived < maximumArticleCutoffDate
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}
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func filterIncomingArticles(_ articles: Set<Article>, _ statuses: [String: ArticleStatus]) -> Set<Article> {
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// Drop Articles that we can ignore.
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return Set(articles.filter{ (article) -> Bool in
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let articleID = article.articleID
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if let status = statuses[articleID] {
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return !statusIndicatesArticleIsIgnorable(status)
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}
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assertionFailure("Expected a status for each Article.")
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return true
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})
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}
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}
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