906 lines
32 KiB
Swift
906 lines
32 KiB
Swift
//
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// ArticlesTable.swift
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// NetNewsWire
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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 Articles
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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: DatabaseQueue
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private let statusesTable: StatusesTable
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private let authorsLookupTable: DatabaseLookupTable
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private var articlesCache = [String: Article]()
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private lazy var searchTable: SearchTable = {
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return SearchTable(queue: queue, articlesTable: self)
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}()
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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: 90)!
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private typealias ArticlesFetchMethod = (FMDatabase) -> Set<Article>
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init(name: String, accountID: String, queue: DatabaseQueue) {
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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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}
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// MARK: - Fetching Articles for Feed
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func fetchArticles(_ webFeedID: String) throws -> Set<Article> {
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return try fetchArticles{ self.fetchArticlesForFeedID(webFeedID, withLimits: true, $0) }
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}
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func fetchArticlesAsync(_ webFeedID: String, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchArticlesForFeedID(webFeedID, withLimits: true, $0) }, completion)
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}
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func fetchArticles(_ webFeedIDs: Set<String>) throws -> Set<Article> {
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return try fetchArticles{ self.fetchArticles(webFeedIDs, $0) }
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}
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func fetchArticlesAsync(_ webFeedIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchArticles(webFeedIDs, $0) }, completion)
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}
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// MARK: - Fetching Articles by articleID
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func fetchArticles(articleIDs: Set<String>) throws -> Set<Article> {
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return try fetchArticles{ self.fetchArticles(articleIDs: articleIDs, $0) }
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}
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func fetchArticlesAsync(articleIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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return fetchArticlesAsync({ self.fetchArticles(articleIDs: articleIDs, $0) }, completion)
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}
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// MARK: - Fetching Unread Articles
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func fetchUnreadArticles(_ webFeedIDs: Set<String>) throws -> Set<Article> {
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return try fetchArticles{ self.fetchUnreadArticles(webFeedIDs, $0) }
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}
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func fetchUnreadArticlesAsync(_ webFeedIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchUnreadArticles(webFeedIDs, $0) }, completion)
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}
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// MARK: - Fetching Today Articles
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func fetchArticlesSince(_ webFeedIDs: Set<String>, _ cutoffDate: Date) throws -> Set<Article> {
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return try fetchArticles{ self.fetchArticlesSince(webFeedIDs, cutoffDate, $0) }
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}
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func fetchArticlesSinceAsync(_ webFeedIDs: Set<String>, _ cutoffDate: Date, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchArticlesSince(webFeedIDs, cutoffDate, $0) }, completion)
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}
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// MARK: - Fetching Starred Articles
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func fetchStarredArticles(_ webFeedIDs: Set<String>) throws -> Set<Article> {
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return try fetchArticles{ self.fetchStarredArticles(webFeedIDs, $0) }
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}
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func fetchStarredArticlesAsync(_ webFeedIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchStarredArticles(webFeedIDs, $0) }, completion)
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}
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// MARK: - Fetching Search Articles
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func fetchArticlesMatching(_ searchString: String) throws -> Set<Article> {
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var articles: Set<Article> = Set<Article>()
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var error: DatabaseError? = nil
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queue.runInDatabaseSync { (databaseResult) in
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switch databaseResult {
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case .success(let database):
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articles = self.fetchArticlesMatching(searchString, database)
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case .failure(let databaseError):
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error = databaseError
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}
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}
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if let error = error {
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throw(error)
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}
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return articles
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}
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func fetchArticlesMatching(_ searchString: String, _ webFeedIDs: Set<String>) throws -> Set<Article> {
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var articles = try fetchArticlesMatching(searchString)
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articles = articles.filter{ webFeedIDs.contains($0.webFeedID) }
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return articles
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}
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func fetchArticlesMatchingWithArticleIDs(_ searchString: String, _ articleIDs: Set<String>) throws -> Set<Article> {
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var articles = try fetchArticlesMatching(searchString)
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articles = articles.filter{ articleIDs.contains($0.articleID) }
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return articles
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}
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func fetchArticlesMatchingAsync(_ searchString: String, _ webFeedIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchArticlesMatching(searchString, webFeedIDs, $0) }, completion)
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}
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func fetchArticlesMatchingWithArticleIDsAsync(_ searchString: String, _ articleIDs: Set<String>, _ completion: @escaping ArticleSetResultBlock) {
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fetchArticlesAsync({ self.fetchArticlesMatchingWithArticleIDs(searchString, articleIDs, $0) }, completion)
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}
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// MARK: - Fetching Articles for Indexer
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func fetchArticleSearchInfos(_ articleIDs: Set<String>, in database: FMDatabase) -> Set<ArticleSearchInfo>? {
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let parameters = articleIDs.map { $0 as AnyObject }
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let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
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let sql = "select articleID, title, contentHTML, contentText, summary, searchRowID from articles where articleID in \(placeholders);";
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if let resultSet = database.executeQuery(sql, withArgumentsIn: parameters) {
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return resultSet.mapToSet { (row) -> ArticleSearchInfo? in
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let articleID = row.string(forColumn: DatabaseKey.articleID)!
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let title = row.string(forColumn: DatabaseKey.title)
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let contentHTML = row.string(forColumn: DatabaseKey.contentHTML)
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let contentText = row.string(forColumn: DatabaseKey.contentText)
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let summary = row.string(forColumn: DatabaseKey.summary)
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let searchRowIDObject = row.object(forColumnName: DatabaseKey.searchRowID)
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var searchRowID: Int? = nil
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if searchRowIDObject != nil && !(searchRowIDObject is NSNull) {
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searchRowID = Int(row.longLongInt(forColumn: DatabaseKey.searchRowID))
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}
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return ArticleSearchInfo(articleID: articleID, title: title, contentHTML: contentHTML, contentText: contentText, summary: summary, searchRowID: searchRowID)
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}
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}
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return nil
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}
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// MARK: - Updating
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func update(_ webFeedID: String, _ items: Set<ParsedItem>, _ read: Bool, _ completion: @escaping UpdateArticlesCompletionBlock) {
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if items.isEmpty {
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callUpdateArticlesCompletionBlock(nil, nil, completion)
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return
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}
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// 1. Ensure statuses for all the incoming articles.
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// 2. Create incoming articles with parsedItems.
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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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// 8. Update search index.
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self.queue.runInTransaction { (databaseResult) in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let articleIDs = items.articleIDs()
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let statusesDictionary = self.statusesTable.ensureStatusesForArticleIDs(articleIDs, read, database) //1
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assert(statusesDictionary.count == articleIDs.count)
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let allIncomingArticles = Article.articlesWithWebFeedIDsAndItems(webFeedID, items, self.accountID, statusesDictionary) //2
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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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let incomingArticles = self.filterIncomingArticles(allIncomingArticles) //3
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if incomingArticles.isEmpty {
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self.callUpdateArticlesCompletionBlock(nil, nil, completion)
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return
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}
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let incomingArticleIDs = incomingArticles.articleIDs()
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let fetchedArticles = self.fetchArticles(articleIDs: incomingArticleIDs, database) //4
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let fetchedArticlesDictionary = fetchedArticles.dictionary()
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let newArticles = self.findAndSaveNewArticles(incomingArticles, fetchedArticlesDictionary, database) //5
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let updatedArticles = self.findAndSaveUpdatedArticles(incomingArticles, fetchedArticlesDictionary, database) //6
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self.callUpdateArticlesCompletionBlock(newArticles, updatedArticles, completion) //7
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self.addArticlesToCache(newArticles)
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self.addArticlesToCache(updatedArticles)
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// 8. Update search index.
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if let newArticles = newArticles {
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self.searchTable.indexNewArticles(newArticles, database)
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}
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if let updatedArticles = updatedArticles {
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self.searchTable.indexUpdatedArticles(updatedArticles, database)
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}
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}
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switch databaseResult {
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case .success(let database):
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makeDatabaseCalls(database)
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case .failure(let databaseError):
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DispatchQueue.main.async {
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completion(.failure(databaseError))
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}
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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(_ webFeedIDs: Set<String>, _ completion: @escaping UnreadCountDictionaryCompletionBlock) {
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if webFeedIDs.isEmpty {
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completion(.success(UnreadCountDictionary()))
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return
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}
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fetchAllUnreadCounts { (unreadCountsResult) in
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func createUnreadCountDictionary(_ unreadCountDictionary: UnreadCountDictionary) -> UnreadCountDictionary {
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var d = UnreadCountDictionary()
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for webFeedID in webFeedIDs {
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d[webFeedID] = unreadCountDictionary[webFeedID] ?? 0
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}
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return d
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}
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switch unreadCountsResult {
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case .success(let unreadCountDictionary):
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completion(.success(createUnreadCountDictionary(unreadCountDictionary)))
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case .failure(let databaseError):
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completion(.failure(databaseError))
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}
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}
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}
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func fetchUnreadCount(_ webFeedIDs: Set<String>, _ since: Date, _ completion: @escaping SingleUnreadCountCompletionBlock) {
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// Get unread count for today, for instance.
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if webFeedIDs.isEmpty {
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completion(.success(0))
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return
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}
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queue.runInDatabase { databaseResult in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
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let sql = "select count(*) from articles natural join statuses where feedID in \(placeholders) and (datePublished > ? or (datePublished is null and dateArrived > ?)) and read=0 and userDeleted=0;"
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var parameters = [Any]()
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parameters += Array(webFeedIDs) as [Any]
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parameters += [since] as [Any]
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parameters += [since] as [Any]
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let unreadCount = self.numberWithSQLAndParameters(sql, parameters, in: database)
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DispatchQueue.main.async {
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completion(.success(unreadCount))
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}
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}
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switch databaseResult {
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case .success(let database):
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makeDatabaseCalls(database)
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case .failure(let databaseError):
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DispatchQueue.main.async {
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completion(.failure(databaseError))
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}
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}
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}
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}
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func fetchAllUnreadCounts(_ completion: @escaping UnreadCountDictionaryCompletionBlock) {
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// Returns only where unreadCount > 0.
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let cutoffDate = articleCutoffDate
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queue.runInDatabase { databaseResult in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let sql = "select distinct feedID, count(*) from articles natural join statuses where read=0 and userDeleted=0 and (starred=1 or dateArrived>?) group by feedID;"
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guard let resultSet = database.executeQuery(sql, withArgumentsIn: [cutoffDate]) else {
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DispatchQueue.main.async {
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completion(.success(UnreadCountDictionary()))
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}
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return
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}
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var d = UnreadCountDictionary()
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while resultSet.next() {
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let unreadCount = resultSet.long(forColumnIndex: 1)
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if let webFeedID = resultSet.string(forColumnIndex: 0) {
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d[webFeedID] = unreadCount
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}
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}
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DispatchQueue.main.async {
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completion(.success(d))
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}
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}
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switch databaseResult {
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case .success(let database):
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makeDatabaseCalls(database)
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case .failure(let databaseError):
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DispatchQueue.main.async {
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completion(.failure(databaseError))
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}
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}
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}
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}
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func fetchStarredAndUnreadCount(_ webFeedIDs: Set<String>, _ completion: @escaping SingleUnreadCountCompletionBlock) {
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if webFeedIDs.isEmpty {
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completion(.success(0))
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return
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}
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queue.runInDatabase { databaseResult in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
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let sql = "select count(*) from articles natural join statuses where feedID in \(placeholders) and read=0 and starred=1 and userDeleted=0;"
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let parameters = Array(webFeedIDs) as [Any]
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let unreadCount = self.numberWithSQLAndParameters(sql, parameters, in: database)
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DispatchQueue.main.async {
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completion(.success(unreadCount))
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}
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}
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switch databaseResult {
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case .success(let database):
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makeDatabaseCalls(database)
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case .failure(let databaseError):
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DispatchQueue.main.async {
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completion(.failure(databaseError))
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}
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}
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}
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}
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// MARK: - Statuses
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func fetchUnreadArticleIDsAsync(_ webFeedIDs: Set<String>, _ completion: @escaping ArticleIDsCompletionBlock) {
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fetchArticleIDsAsync(.read, false, webFeedIDs, completion)
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}
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func fetchStarredArticleIDsAsync(_ webFeedIDs: Set<String>, _ completion: @escaping ArticleIDsCompletionBlock) {
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fetchArticleIDsAsync(.starred, true, webFeedIDs, completion)
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}
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func fetchStarredArticleIDs() throws -> Set<String> {
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return try statusesTable.fetchStarredArticleIDs()
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}
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func fetchArticleIDsForStatusesWithoutArticlesNewerThanCutoffDate(_ completion: @escaping ArticleIDsCompletionBlock) {
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statusesTable.fetchArticleIDsForStatusesWithoutArticlesNewerThan(articleCutoffDate, completion)
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}
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func mark(_ articles: Set<Article>, _ statusKey: ArticleStatus.Key, _ flag: Bool) throws -> Set<ArticleStatus>? {
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var statuses: Set<ArticleStatus>?
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var error: DatabaseError?
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self.queue.runInTransactionSync { databaseResult in
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switch databaseResult {
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case .success(let database):
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statuses = self.statusesTable.mark(articles.statuses(), statusKey, flag, database)
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case .failure(let databaseError):
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error = databaseError
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}
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}
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if let error = error {
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throw error
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}
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return statuses
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}
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func mark(_ articleIDs: Set<String>, _ statusKey: ArticleStatus.Key, _ flag: Bool, _ completion: @escaping DatabaseCompletionBlock) {
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queue.runInTransaction { databaseResult in
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switch databaseResult {
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case .success(let database):
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self.statusesTable.mark(articleIDs, statusKey, flag, database)
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DispatchQueue.main.async {
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completion(nil)
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}
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case .failure(let databaseError):
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DispatchQueue.main.async {
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completion(databaseError)
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}
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}
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}
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}
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// MARK: - Indexing
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func indexUnindexedArticles() {
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queue.runInDatabase { databaseResult in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let sql = "select articleID from articles where searchRowID is null limit 500;"
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guard let resultSet = database.executeQuery(sql, withArgumentsIn: nil) else {
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return
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}
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let articleIDs = resultSet.mapToSet{ $0.string(forColumn: DatabaseKey.articleID) }
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if articleIDs.isEmpty {
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return
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}
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self.searchTable.ensureIndexedArticles(articleIDs, database)
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DispatchQueue.main.async {
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self.indexUnindexedArticles()
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}
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}
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if let database = databaseResult.database {
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makeDatabaseCalls(database)
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}
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}
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}
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// MARK: - Caches
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func emptyCaches() {
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queue.runInDatabase { _ in
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self.articlesCache = [String: Article]()
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}
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}
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// MARK: - Cleanup
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/// Delete articles from feeds that are no longer in the current set of subscribed-to feeds.
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/// This deletes from the articles and articleStatuses tables,
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/// and, via a trigger, it also deletes from the search index.
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func deleteArticlesNotInSubscribedToFeedIDs(_ webFeedIDs: Set<String>) {
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if webFeedIDs.isEmpty {
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return
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}
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queue.runInDatabase { databaseResult in
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func makeDatabaseCalls(_ database: FMDatabase) {
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let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
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let sql = "select articleID from articles where feedID not in \(placeholders);"
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let parameters = Array(webFeedIDs) as [Any]
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guard let resultSet = database.executeQuery(sql, withArgumentsIn: parameters) else {
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return
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}
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let articleIDs = resultSet.mapToSet{ $0.string(forColumn: DatabaseKey.articleID) }
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if articleIDs.isEmpty {
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return
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}
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self.removeArticles(articleIDs, database)
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self.statusesTable.removeStatuses(articleIDs, database)
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}
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if let database = databaseResult.database {
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makeDatabaseCalls(database)
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}
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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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private func fetchArticles(_ fetchMethod: @escaping ArticlesFetchMethod) throws -> Set<Article> {
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var articles = Set<Article>()
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var error: DatabaseError? = nil
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queue.runInDatabaseSync { databaseResult in
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switch databaseResult {
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case .success(let database):
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articles = fetchMethod(database)
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case .failure(let databaseError):
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error = databaseError
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}
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}
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if let error = error {
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throw(error)
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}
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return articles
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}
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private func fetchArticlesAsync(_ fetchMethod: @escaping ArticlesFetchMethod, _ completion: @escaping ArticleSetResultBlock) {
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queue.runInDatabase { databaseResult in
|
||
|
||
switch databaseResult {
|
||
case .success(let database):
|
||
let articles = fetchMethod(database)
|
||
DispatchQueue.main.async {
|
||
completion(.success(articles))
|
||
}
|
||
case .failure(let databaseError):
|
||
DispatchQueue.main.async {
|
||
completion(.failure(databaseError))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func articlesWithResultSet(_ resultSet: FMResultSet, _ database: FMDatabase) -> Set<Article> {
|
||
var cachedArticles = Set<Article>()
|
||
var fetchedArticles = Set<Article>()
|
||
|
||
while resultSet.next() {
|
||
|
||
guard let articleID = resultSet.string(forColumn: DatabaseKey.articleID) else {
|
||
assertionFailure("Expected articleID.")
|
||
continue
|
||
}
|
||
|
||
if let article = articlesCache[articleID] {
|
||
cachedArticles.insert(article)
|
||
continue
|
||
}
|
||
|
||
// The resultSet is a result of a JOIN query with the statuses table,
|
||
// so we can get the statuses at the same time and avoid additional database lookups.
|
||
guard let status = statusesTable.statusWithRow(resultSet, articleID: articleID) else {
|
||
assertionFailure("Expected status.")
|
||
continue
|
||
}
|
||
|
||
guard let article = Article(accountID: accountID, row: resultSet, status: status) else {
|
||
continue
|
||
}
|
||
fetchedArticles.insert(article)
|
||
}
|
||
resultSet.close()
|
||
|
||
if fetchedArticles.isEmpty {
|
||
return cachedArticles
|
||
}
|
||
|
||
// Fetch authors for non-cached articles. (Articles from the cache already have authors.)
|
||
let fetchedArticleIDs = fetchedArticles.articleIDs()
|
||
let authorsMap = authorsLookupTable.fetchRelatedObjects(for: fetchedArticleIDs, in: database)
|
||
let articlesWithFetchedAuthors = fetchedArticles.map { (article) -> Article in
|
||
if let authors = authorsMap?.authors(for: article.articleID) {
|
||
return article.byAdding(authors)
|
||
}
|
||
return article
|
||
}
|
||
|
||
// Add fetchedArticles to cache, now that they have attached authors.
|
||
for article in articlesWithFetchedAuthors {
|
||
articlesCache[article.articleID] = article
|
||
}
|
||
|
||
return cachedArticles.union(articlesWithFetchedAuthors)
|
||
}
|
||
|
||
func fetchArticlesWithWhereClause(_ database: FMDatabase, whereClause: String, parameters: [AnyObject], withLimits: Bool) -> Set<Article> {
|
||
// Don’t fetch articles that shouldn’t appear in the UI. The rules:
|
||
// * Must not be deleted.
|
||
// * Must be either 1) starred or 2) dateArrived must be newer than cutoff date.
|
||
|
||
if withLimits {
|
||
let sql = "select * from articles natural join statuses where \(whereClause) and userDeleted=0 and (starred=1 or dateArrived>?);"
|
||
return articlesWithSQL(sql, parameters + [articleCutoffDate as AnyObject], database)
|
||
}
|
||
else {
|
||
let sql = "select * from articles natural join statuses where \(whereClause);"
|
||
return articlesWithSQL(sql, parameters, database)
|
||
}
|
||
}
|
||
|
||
func fetchUnreadCount(_ webFeedID: String, _ database: FMDatabase) -> Int {
|
||
// Count only the articles that would appear in the UI.
|
||
// * Must be unread.
|
||
// * Must not be deleted.
|
||
// * Must be either 1) starred or 2) dateArrived must be newer than cutoff date.
|
||
|
||
let sql = "select count(*) from articles natural join statuses where feedID=? and read=0 and userDeleted=0 and (starred=1 or dateArrived>?);"
|
||
return numberWithSQLAndParameters(sql, [webFeedID, articleCutoffDate], in: database)
|
||
}
|
||
|
||
func fetchArticlesMatching(_ searchString: String, _ database: FMDatabase) -> Set<Article> {
|
||
let sql = "select rowid from search where search match ?;"
|
||
let sqlSearchString = sqliteSearchString(with: searchString)
|
||
let searchStringParameters = [sqlSearchString]
|
||
guard let resultSet = database.executeQuery(sql, withArgumentsIn: searchStringParameters) else {
|
||
return Set<Article>()
|
||
}
|
||
let searchRowIDs = resultSet.mapToSet { $0.longLongInt(forColumnIndex: 0) }
|
||
if searchRowIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(searchRowIDs.count))!
|
||
let whereClause = "searchRowID in \(placeholders)"
|
||
let parameters: [AnyObject] = Array(searchRowIDs) as [AnyObject]
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: true)
|
||
}
|
||
|
||
func sqliteSearchString(with searchString: String) -> String {
|
||
var s = ""
|
||
searchString.enumerateSubstrings(in: searchString.startIndex..<searchString.endIndex, options: .byWords) { (word, range, enclosingRange, stop) in
|
||
guard let word = word else {
|
||
return
|
||
}
|
||
s += word
|
||
if s != "AND" && s != "OR" {
|
||
s += "*"
|
||
}
|
||
s += " "
|
||
}
|
||
return s
|
||
}
|
||
|
||
func articlesWithSQL(_ sql: String, _ parameters: [AnyObject], _ database: FMDatabase) -> Set<Article> {
|
||
guard let resultSet = database.executeQuery(sql, withArgumentsIn: parameters) else {
|
||
return Set<Article>()
|
||
}
|
||
return articlesWithResultSet(resultSet, database)
|
||
}
|
||
|
||
func fetchArticleIDsAsync(_ statusKey: ArticleStatus.Key, _ value: Bool, _ webFeedIDs: Set<String>, _ completion: @escaping ArticleIDsCompletionBlock) {
|
||
guard !webFeedIDs.isEmpty else {
|
||
completion(.success(Set<String>()))
|
||
return
|
||
}
|
||
|
||
queue.runInDatabase { databaseResult in
|
||
|
||
func makeDatabaseCalls(_ database: FMDatabase) {
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
|
||
var sql = "select articleID from articles natural join statuses where feedID in \(placeholders) and \(statusKey.rawValue)="
|
||
sql += value ? "1" : "0"
|
||
if statusKey != .userDeleted {
|
||
sql += " and userDeleted=0"
|
||
}
|
||
sql += ";"
|
||
|
||
let parameters = Array(webFeedIDs) as [Any]
|
||
|
||
guard let resultSet = database.executeQuery(sql, withArgumentsIn: parameters) else {
|
||
DispatchQueue.main.async {
|
||
completion(.success(Set<String>()))
|
||
}
|
||
return
|
||
}
|
||
|
||
let articleIDs = resultSet.mapToSet{ $0.string(forColumnIndex: 0) }
|
||
DispatchQueue.main.async {
|
||
completion(.success(articleIDs))
|
||
}
|
||
}
|
||
|
||
switch databaseResult {
|
||
case .success(let database):
|
||
makeDatabaseCalls(database)
|
||
case .failure(let databaseError):
|
||
DispatchQueue.main.async {
|
||
completion(.failure(databaseError))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func fetchArticles(_ webFeedIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
// select * from articles natural join statuses where feedID in ('http://ranchero.com/xml/rss.xml') and read=0
|
||
if webFeedIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
let parameters = webFeedIDs.map { $0 as AnyObject }
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
|
||
let whereClause = "feedID in \(placeholders)"
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: true)
|
||
}
|
||
|
||
func fetchUnreadArticles(_ webFeedIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
// select * from articles natural join statuses where feedID in ('http://ranchero.com/xml/rss.xml') and read=0
|
||
if webFeedIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
let parameters = webFeedIDs.map { $0 as AnyObject }
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
|
||
let whereClause = "feedID in \(placeholders) and read=0"
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: true)
|
||
}
|
||
|
||
func fetchArticlesForFeedID(_ webFeedID: String, withLimits: Bool, _ database: FMDatabase) -> Set<Article> {
|
||
return fetchArticlesWithWhereClause(database, whereClause: "articles.feedID = ?", parameters: [webFeedID as AnyObject], withLimits: withLimits)
|
||
}
|
||
|
||
func fetchArticles(articleIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
if articleIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
let parameters = articleIDs.map { $0 as AnyObject }
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
|
||
let whereClause = "articleID in \(placeholders)"
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: false)
|
||
}
|
||
|
||
func fetchArticlesSince(_ webFeedIDs: Set<String>, _ cutoffDate: Date, _ database: FMDatabase) -> Set<Article> {
|
||
// select * from articles natural join statuses where feedID in ('http://ranchero.com/xml/rss.xml') and (datePublished > ? || (datePublished is null and dateArrived > ?)
|
||
//
|
||
// datePublished may be nil, so we fall back to dateArrived.
|
||
if webFeedIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
let parameters = webFeedIDs.map { $0 as AnyObject } + [cutoffDate as AnyObject, cutoffDate as AnyObject]
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
|
||
let whereClause = "feedID in \(placeholders) and (datePublished > ? or (datePublished is null and dateArrived > ?)) and userDeleted = 0"
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: false)
|
||
}
|
||
|
||
func fetchStarredArticles(_ webFeedIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
// select * from articles natural join statuses where feedID in ('http://ranchero.com/xml/rss.xml') and starred = 1 and userDeleted = 0;
|
||
if webFeedIDs.isEmpty {
|
||
return Set<Article>()
|
||
}
|
||
let parameters = webFeedIDs.map { $0 as AnyObject }
|
||
let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(webFeedIDs.count))!
|
||
let whereClause = "feedID in \(placeholders) and starred = 1 and userDeleted = 0"
|
||
return fetchArticlesWithWhereClause(database, whereClause: whereClause, parameters: parameters, withLimits: false)
|
||
}
|
||
|
||
func fetchArticlesMatching(_ searchString: String, _ webFeedIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
let articles = fetchArticlesMatching(searchString, database)
|
||
// TODO: include the feedIDs in the SQL rather than filtering here.
|
||
return articles.filter{ webFeedIDs.contains($0.webFeedID) }
|
||
}
|
||
|
||
func fetchArticlesMatchingWithArticleIDs(_ searchString: String, _ articleIDs: Set<String>, _ database: FMDatabase) -> Set<Article> {
|
||
let articles = fetchArticlesMatching(searchString, database)
|
||
// TODO: include the articleIDs in the SQL rather than filtering here.
|
||
return articles.filter{ articleIDs.contains($0.articleID) }
|
||
}
|
||
|
||
// MARK: - Saving Parsed Items
|
||
|
||
func callUpdateArticlesCompletionBlock(_ newArticles: Set<Article>?, _ updatedArticles: Set<Article>?, _ completion: @escaping UpdateArticlesCompletionBlock) {
|
||
let newAndUpdatedArticles = NewAndUpdatedArticles(newArticles: newArticles, updatedArticles: updatedArticles)
|
||
DispatchQueue.main.async {
|
||
completion(.success(newAndUpdatedArticles))
|
||
}
|
||
}
|
||
|
||
// MARK: - Saving New Articles
|
||
|
||
func findNewArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article]) -> Set<Article>? {
|
||
let newArticles = Set(incomingArticles.filter { fetchedArticlesDictionary[$0.articleID] == nil })
|
||
return newArticles.isEmpty ? nil : newArticles
|
||
}
|
||
|
||
func findAndSaveNewArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article], _ database: FMDatabase) -> Set<Article>? { //5
|
||
guard let newArticles = findNewArticles(incomingArticles, fetchedArticlesDictionary) else {
|
||
return nil
|
||
}
|
||
self.saveNewArticles(newArticles, database)
|
||
return newArticles
|
||
}
|
||
|
||
func saveNewArticles(_ articles: Set<Article>, _ database: FMDatabase) {
|
||
saveRelatedObjectsForNewArticles(articles, database)
|
||
|
||
if let databaseDictionaries = articles.databaseDictionaries() {
|
||
insertRows(databaseDictionaries, insertType: .orReplace, in: database)
|
||
}
|
||
}
|
||
|
||
func saveRelatedObjectsForNewArticles(_ articles: Set<Article>, _ database: FMDatabase) {
|
||
let databaseObjects = articles.databaseObjects()
|
||
authorsLookupTable.saveRelatedObjects(for: databaseObjects, in: database)
|
||
}
|
||
|
||
// MARK: - Updating Existing Articles
|
||
|
||
func articlesWithRelatedObjectChanges<T>(_ comparisonKeyPath: KeyPath<Article, Set<T>?>, _ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article]) -> Set<Article> {
|
||
return updatedArticles.filter{ (updatedArticle) -> Bool in
|
||
if let fetchedArticle = fetchedArticles[updatedArticle.articleID] {
|
||
return updatedArticle[keyPath: comparisonKeyPath] != fetchedArticle[keyPath: comparisonKeyPath]
|
||
}
|
||
assertionFailure("Expected to find matching fetched article.");
|
||
return true
|
||
}
|
||
}
|
||
|
||
func updateRelatedObjects<T>(_ comparisonKeyPath: KeyPath<Article, Set<T>?>, _ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ lookupTable: DatabaseLookupTable, _ database: FMDatabase) {
|
||
let articlesWithChanges = articlesWithRelatedObjectChanges(comparisonKeyPath, updatedArticles, fetchedArticles)
|
||
if !articlesWithChanges.isEmpty {
|
||
lookupTable.saveRelatedObjects(for: articlesWithChanges.databaseObjects(), in: database)
|
||
}
|
||
}
|
||
|
||
func saveUpdatedRelatedObjects(_ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
|
||
updateRelatedObjects(\Article.authors, updatedArticles, fetchedArticles, authorsLookupTable, database)
|
||
}
|
||
|
||
func findUpdatedArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article]) -> Set<Article>? {
|
||
let updatedArticles = incomingArticles.filter{ (incomingArticle) -> Bool in //6
|
||
if let existingArticle = fetchedArticlesDictionary[incomingArticle.articleID] {
|
||
if existingArticle != incomingArticle {
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
return updatedArticles.isEmpty ? nil : updatedArticles
|
||
}
|
||
|
||
func findAndSaveUpdatedArticles(_ incomingArticles: Set<Article>, _ fetchedArticlesDictionary: [String: Article], _ database: FMDatabase) -> Set<Article>? { //6
|
||
guard let updatedArticles = findUpdatedArticles(incomingArticles, fetchedArticlesDictionary) else {
|
||
return nil
|
||
}
|
||
saveUpdatedArticles(Set(updatedArticles), fetchedArticlesDictionary, database)
|
||
return updatedArticles
|
||
}
|
||
|
||
|
||
func saveUpdatedArticles(_ updatedArticles: Set<Article>, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
|
||
saveUpdatedRelatedObjects(updatedArticles, fetchedArticles, database)
|
||
|
||
for updatedArticle in updatedArticles {
|
||
saveUpdatedArticle(updatedArticle, fetchedArticles, database)
|
||
}
|
||
}
|
||
|
||
func saveUpdatedArticle(_ updatedArticle: Article, _ fetchedArticles: [String: Article], _ database: FMDatabase) {
|
||
// Only update exactly what has changed in the Article (if anything).
|
||
// Untested theory: this gets us better performance and less database fragmentation.
|
||
|
||
guard let fetchedArticle = fetchedArticles[updatedArticle.articleID] else {
|
||
assertionFailure("Expected to find matching fetched article.");
|
||
saveNewArticles(Set([updatedArticle]), database)
|
||
return
|
||
}
|
||
guard let changesDictionary = updatedArticle.changesFrom(fetchedArticle), changesDictionary.count > 0 else {
|
||
// Not unexpected. There may be no changes.
|
||
return
|
||
}
|
||
|
||
updateRowsWithDictionary(changesDictionary, whereKey: DatabaseKey.articleID, matches: updatedArticle.articleID, database: database)
|
||
}
|
||
|
||
func addArticlesToCache(_ articles: Set<Article>?) {
|
||
guard let articles = articles else {
|
||
return
|
||
}
|
||
for article in articles {
|
||
articlesCache[article.articleID] = article
|
||
}
|
||
}
|
||
|
||
func articleIsIgnorable(_ article: Article) -> Bool {
|
||
// Ignorable articles: either userDeleted==1 or (not starred and arrival date > 4 months).
|
||
if article.status.userDeleted {
|
||
return true
|
||
}
|
||
if article.status.starred {
|
||
return false
|
||
}
|
||
return article.status.dateArrived < articleCutoffDate
|
||
}
|
||
|
||
func filterIncomingArticles(_ articles: Set<Article>) -> Set<Article> {
|
||
// Drop Articles that we can ignore.
|
||
return Set(articles.filter{ !articleIsIgnorable($0) })
|
||
}
|
||
|
||
func removeArticles(_ articleIDs: Set<String>, _ database: FMDatabase) {
|
||
deleteRowsWhere(key: DatabaseKey.articleID, equalsAnyValue: Array(articleIDs), in: database)
|
||
}
|
||
}
|
||
|
||
private extension Set where Element == ParsedItem {
|
||
func articleIDs() -> Set<String> {
|
||
return Set<String>(map { $0.articleID })
|
||
}
|
||
}
|