Move modules to Modules folder.

Modules/SyncDatabase/Sources/SyncDatabase/Constants.swift

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+//
+//  Constants.swift
+//  SyncDatabase
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+struct DatabaseTableName {
+	
+	static let syncStatus = "syncStatus"
+	
+}
+
+struct DatabaseKey {
+	
+	// Sync Status
+	static let articleID = "articleID"
+	static let key = "key"
+	static let flag = "flag"
+	static let selected = "selected"
+
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncDatabase.swift

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+//
+//  SyncDatabase.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import RSCore
+import RSDatabase
+
+public typealias SyncStatusesResult = Result<Array<SyncStatus>, DatabaseError>
+public typealias SyncStatusesCompletionBlock = (SyncStatusesResult) -> Void
+
+public typealias SyncStatusArticleIDsResult = Result<Set<String>, DatabaseError>
+public typealias SyncStatusArticleIDsCompletionBlock = (SyncStatusArticleIDsResult) -> Void
+
+public struct SyncDatabase {
+
+	private let syncStatusTable: SyncStatusTable
+	private let queue: DatabaseQueue
+
+	public init(databaseFilePath: String) {
+		let queue = DatabaseQueue(databasePath: databaseFilePath)
+		try! queue.runCreateStatements(SyncDatabase.tableCreationStatements)
+		queue.vacuumIfNeeded(daysBetweenVacuums: 11)
+		self.queue = queue
+
+		self.syncStatusTable = SyncStatusTable(queue: queue)
+	}
+
+	// MARK: - API
+
+	public func insertStatuses(_ statuses: [SyncStatus], completion: @escaping DatabaseCompletionBlock) {
+		syncStatusTable.insertStatuses(statuses, completion: completion)
+	}
+	
+	public func selectForProcessing(limit: Int? = nil, completion: @escaping SyncStatusesCompletionBlock) {
+		return syncStatusTable.selectForProcessing(limit: limit, completion: completion)
+	}
+
+	public func selectPendingCount(completion: @escaping DatabaseIntCompletionBlock) {
+		syncStatusTable.selectPendingCount(completion)
+	}
+
+    public func selectPendingReadStatusArticleIDs(completion: @escaping SyncStatusArticleIDsCompletionBlock) {
+        syncStatusTable.selectPendingReadStatusArticleIDs(completion: completion)
+    }
+    
+    public func selectPendingStarredStatusArticleIDs(completion: @escaping SyncStatusArticleIDsCompletionBlock) {
+        syncStatusTable.selectPendingStarredStatusArticleIDs(completion: completion)
+    }
+    
+	public func resetAllSelectedForProcessing(completion: DatabaseCompletionBlock? = nil) {
+		syncStatusTable.resetAllSelectedForProcessing(completion: completion)
+	}
+
+	public func resetSelectedForProcessing(_ articleIDs: [String], completion: DatabaseCompletionBlock? = nil) {
+		syncStatusTable.resetSelectedForProcessing(articleIDs, completion: completion)
+	}
+	
+    public func deleteSelectedForProcessing(_ articleIDs: [String], completion: DatabaseCompletionBlock? = nil) {
+		syncStatusTable.deleteSelectedForProcessing(articleIDs, completion: completion)
+	}
+
+	// MARK: - Suspend and Resume (for iOS)
+
+	/// Close the database and stop running database calls.
+	/// Any pending calls will complete first.
+	public func suspend() {
+		queue.suspend()
+	}
+
+	/// Open the database and allow for running database calls again.
+	public func resume() {
+		queue.resume()
+	}
+}
+
+// MARK: - Private
+
+private extension SyncDatabase {
+	
+	static let tableCreationStatements = """
+	CREATE TABLE if not EXISTS syncStatus (articleID TEXT NOT NULL, key TEXT NOT NULL, flag BOOL NOT NULL DEFAULT 0, selected BOOL NOT NULL DEFAULT 0, PRIMARY KEY (articleID, key));
+	"""
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncStatus.swift

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+//
+//  SyncStatus.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Articles
+import RSDatabase
+
+public struct SyncStatus: Hashable, Equatable {
+	
+	public enum Key: String {
+		case read = "read"
+		case starred = "starred"
+		case deleted = "deleted"
+		case new = "new"
+		
+		public init(_ articleStatusKey: ArticleStatus.Key) {
+			switch articleStatusKey {
+			case .read:
+				self = Self.read
+			case .starred:
+				self = Self.starred
+			}
+		}
+		
+	}
+
+	public let articleID: String
+	public let key: SyncStatus.Key
+	public let flag: Bool
+	public let selected: Bool
+	
+	public init(articleID: String, key: SyncStatus.Key, flag: Bool, selected: Bool = false) {
+		self.articleID = articleID
+		self.key = key
+		self.flag = flag
+		self.selected = selected
+	}
+	
+	public func databaseDictionary() -> DatabaseDictionary {
+		return [DatabaseKey.articleID: articleID, DatabaseKey.key: key.rawValue, DatabaseKey.flag: flag, DatabaseKey.selected: selected]
+	}
+	
+}

Modules/SyncDatabase/Sources/SyncDatabase/SyncStatusTable.swift

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+//
+//  SyncStatusTable.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/14/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import RSCore
+import Articles
+import RSDatabase
+import RSDatabaseObjC
+
+struct SyncStatusTable: DatabaseTable {
+
+	let name = DatabaseTableName.syncStatus
+	private let queue: DatabaseQueue
+
+	init(queue: DatabaseQueue) {
+		self.queue = queue
+	}
+
+	func selectForProcessing(limit: Int?, completion: @escaping SyncStatusesCompletionBlock) {
+		queue.runInTransaction { databaseResult in
+			var statuses = Set<SyncStatus>()
+			var error: DatabaseError?
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let updateSQL = "update syncStatus set selected = true"
+				database.executeUpdate(updateSQL, withArgumentsIn: nil)
+
+				var selectSQL = "select * from syncStatus where selected == true"
+				if let limit = limit {
+					selectSQL = "\(selectSQL) limit \(limit)"
+				}
+				if let resultSet = database.executeQuery(selectSQL, withArgumentsIn: nil) {
+					statuses = resultSet.mapToSet(self.statusWithRow)
+				}
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+			case .failure(let databaseError):
+				error = databaseError
+			}
+
+			DispatchQueue.main.async {
+				if let error = error {
+					completion(.failure(error))
+				}
+				else {
+					completion(.success(Array(statuses)))
+				}
+			}
+		}
+	}
+	
+	func selectPendingCount(_ completion: @escaping DatabaseIntCompletionBlock) {
+		queue.runInDatabase { databaseResult in
+			var count: Int = 0
+			var error: DatabaseError?
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let sql = "select count(*) from syncStatus"
+				if let resultSet = database.executeQuery(sql, withArgumentsIn: nil) {
+					count = self.numberWithCountResultSet(resultSet)
+				}
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+			case .failure(let databaseError):
+				error = databaseError
+			}
+
+			DispatchQueue.main.async {
+				if let error = error {
+					completion(.failure(error))
+				}
+				else {
+					completion(.success(count))
+				}
+			}
+		}
+	}
+
+    func selectPendingReadStatusArticleIDs(completion: @escaping SyncStatusArticleIDsCompletionBlock) {
+        selectPendingArticleIDsAsync(.read, completion)
+    }
+    
+    func selectPendingStarredStatusArticleIDs(completion: @escaping SyncStatusArticleIDsCompletionBlock) {
+        selectPendingArticleIDsAsync(.starred, completion)
+    }
+    
+	func resetAllSelectedForProcessing(completion: DatabaseCompletionBlock? = nil) {
+		queue.runInTransaction { databaseResult in
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let updateSQL = "update syncStatus set selected = false"
+				database.executeUpdate(updateSQL, withArgumentsIn: nil)
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+				callCompletion(completion, nil)
+			case .failure(let databaseError):
+				callCompletion(completion, databaseError)
+			}
+		}
+	}
+
+	func resetSelectedForProcessing(_ articleIDs: [String], completion: DatabaseCompletionBlock? = nil) {
+		guard !articleIDs.isEmpty else {
+			callCompletion(completion, nil)
+			return
+		}
+		
+		queue.runInTransaction { databaseResult in
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let parameters = articleIDs.map { $0 as AnyObject }
+				let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
+				let updateSQL = "update syncStatus set selected = false where articleID in \(placeholders)"
+				database.executeUpdate(updateSQL, withArgumentsIn: parameters)
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+				callCompletion(completion, nil)
+			case .failure(let databaseError):
+				callCompletion(completion, databaseError)
+			}
+		}
+	}
+	
+    func deleteSelectedForProcessing(_ articleIDs: [String], completion: DatabaseCompletionBlock? = nil) {
+		guard !articleIDs.isEmpty else {
+			callCompletion(completion, nil)
+			return
+		}
+		
+		queue.runInTransaction { databaseResult in
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let parameters = articleIDs.map { $0 as AnyObject }
+				let placeholders = NSString.rs_SQLValueList(withPlaceholders: UInt(articleIDs.count))!
+				let deleteSQL = "delete from syncStatus where selected = true and articleID in \(placeholders)"
+				database.executeUpdate(deleteSQL, withArgumentsIn: parameters)
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+				callCompletion(completion, nil)
+			case .failure(let databaseError):
+				callCompletion(completion, databaseError)
+			}
+		}
+	}
+	
+    func insertStatuses(_ statuses: [SyncStatus], completion: @escaping DatabaseCompletionBlock) {
+		queue.runInTransaction { databaseResult in
+
+			func makeDatabaseCall(_ database: FMDatabase) {
+				let statusArray = statuses.map { $0.databaseDictionary() }
+				self.insertRows(statusArray, insertType: .orReplace, in: database)
+			}
+
+			switch databaseResult {
+			case .success(let database):
+				makeDatabaseCall(database)
+				callCompletion(completion, nil)
+			case .failure(let databaseError):
+				callCompletion(completion, databaseError)
+			}
+		}
+	}
+	
+}
+
+private extension SyncStatusTable {
+
+	func statusWithRow(_ row: FMResultSet) -> SyncStatus? {
+		guard let articleID = row.string(forColumn: DatabaseKey.articleID),
+			let rawKey = row.string(forColumn: DatabaseKey.key),
+			let key = SyncStatus.Key(rawValue: rawKey) else {
+				return nil
+		}
+		
+		let flag = row.bool(forColumn: DatabaseKey.flag)
+		let selected = row.bool(forColumn: DatabaseKey.selected)
+		
+		return SyncStatus(articleID: articleID, key: key, flag: flag, selected: selected)
+	}
+    
+    func selectPendingArticleIDsAsync(_ statusKey: ArticleStatus.Key, _ completion: @escaping SyncStatusArticleIDsCompletionBlock) {
+
+        queue.runInDatabase { databaseResult in
+
+            func makeDatabaseCall(_ database: FMDatabase) {
+                let sql = "select articleID from syncStatus where selected == false and key = \"\(statusKey.rawValue)\";"
+
+                guard let resultSet = database.executeQuery(sql, withArgumentsIn: nil) 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):
+                makeDatabaseCall(database)
+            case .failure(let databaseError):
+                DispatchQueue.main.async {
+                    completion(.failure(databaseError))
+                }
+            }
+        }
+    }
+    
+}
+
+private func callCompletion(_ completion: DatabaseCompletionBlock?, _ databaseError: DatabaseError?) {
+	guard let completion = completion else {
+		return
+	}
+	DispatchQueue.main.async {
+		completion(databaseError)
+	}
+}