Refactoring I.

- Revamp whole DB to Display flow
- Filter Pipeline, arbitrary filtering and sorting
- Binary tree arrays for faster lookup & manipulation
- DB: introducing custom functions
- DB scheme: split req into heap & cache
- cache written by GlassVPN only
- heap written by Main App only
- Introducing DB separation: DBCore, DBCommon, DBAppOnly
- Introducing DB data sources: TestDataSource, GroupedDomainDataSource, RecordingsDB, DomainFilter
- Background sync: Move entries from cache to heap and notify all observers
- GlassVPN: Binary tree filter lookup
- GlassVPN: Reusing prepared statement

main/Settings/TVCFilter.swift

@@ -1,23 +1,36 @@
 import UIKit
 
 class TVCFilter: UITableViewController, EditActionsRemove {
-	var currentFilter: FilterOptions = .none
+	var currentFilter: FilterOptions = .none // set by segue
 	private var dataSource: [String] = []
 	
 	override func viewDidLoad() {
 		super.viewDidLoad()
-//		if #available(iOS 10.0, *) {
-//			tableView.refreshControl = UIRefreshControl(call: #selector(reloadDataSource), on: self)
-//		}
-		NotifyDNSFilterChanged.observe(call: #selector(reloadDataSource), on: self)
+		NotifyDNSFilterChanged.observe(call: #selector(didChangeDomainFilter), on: self)
 		reloadDataSource()
 	}
 
-	@objc func reloadDataSource() {
-		dataSource = DBWrp.dataF_list(currentFilter)
+	func reloadDataSource() {
+		dataSource = DomainFilter.list(where: currentFilter)
 		tableView.reloadData()
 	}
 	
+	@objc func didChangeDomainFilter(_ notification: Notification) {
+		guard let domain = notification.object as? String else {
+			reloadDataSource()
+			return
+		}
+		if DomainFilter[domain]?.contains(currentFilter) ?? false {
+			let i = dataSource.binTreeIndex(of: domain, compare: (<))!
+			if i >= dataSource.count || dataSource[i] != domain {
+				dataSource.insert(domain, at: i)
+				tableView.safeInsertRow(i)
+			}
+		} else if let i = dataSource.binTreeRemove(domain, compare: (<)) {
+			tableView.safeDeleteRows([i])
+		}
+	}
+	
 	@IBAction private func addNewFilter() {
 		let desc: String
 		switch currentFilter {
@@ -33,7 +46,7 @@ class TVCFilter: UITableViewController, EditActionsRemove {
 				ErrorAlert("Entered domain is not valid. Filter can't match country TLD only.").presentIn(self)
 				return
 			}
-			DBWrp.updateFilter(dom, add: self.currentFilter)
+			DomainFilter.update(dom, add: self.currentFilter)
 		}
 		alert.addTextField {
 			$0.placeholder = "cdn.domain.tld"
@@ -42,7 +55,7 @@ class TVCFilter: UITableViewController, EditActionsRemove {
 		alert.presentIn(self)
 	}
 	
-	// MARK: - Table View Delegate
+	// MARK: - Table View Data Source
 	
 	override func tableView(_ _: UITableView, numberOfRowsInSection _: Int) -> Int { dataSource.count }
 	
@@ -57,11 +70,17 @@ class TVCFilter: UITableViewController, EditActionsRemove {
 	
 	// MARK: - Editing
 	
+	override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
+		getRowActionsIOS9(indexPath)
+	}
+	@available(iOS 11.0, *)
+	override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
+		getRowActionsIOS11(indexPath)
+	}
+	
 	func editableRowCallback(_ index: IndexPath, _ action: RowAction, _ userInfo: Any?) -> Bool {
 		let domain = dataSource[index.row]
-		DBWrp.updateFilter(domain, remove: currentFilter)
-		dataSource.remove(at: index.row)
-		tableView.deleteRows(at: [index], with: .automatic)
+		DomainFilter.update(domain, remove: currentFilter)
 		return true
 	}
 	

main/Settings/TVCSettings.swift

@@ -16,11 +16,9 @@ class TVCSettings: UITableViewController {
 	}
 	
 	@objc func reloadDataSource() {
-		let (blocked, ignored) = DBWrp.dataF_counts()
-		DispatchQueue.main.async {
-			self.cellDomainsIgnored.detailTextLabel?.text = "\(ignored) Domains"
-			self.cellDomainsBlocked.detailTextLabel?.text = "\(blocked) Domains"
-		}
+		let (blocked, ignored) = DomainFilter.counts()
+		cellDomainsIgnored.detailTextLabel?.text = "\(ignored) Domains"
+		cellDomainsBlocked.detailTextLabel?.text = "\(blocked) Domains"
 	}
 	
 	@IBAction func toggleVPNProxy(_ sender: UISwitch) {
@@ -28,28 +26,8 @@ class TVCSettings: UITableViewController {
 	}
 	
 	@IBAction func exportDB(_ sender: Any) {
-		// TODO: export partly?
-		// TODO: show header-banner of success
-		// Share Sheet
 		let sheet = UIActivityViewController(activityItems: [URL.internalDB()], applicationActivities: nil)
 		self.present(sheet, animated: true)
-		// Save to Files app
-//		self.present(UIDocumentPickerViewController(url: FileManager.default.internalDB(), in: .exportToService), animated: true)
-		// Shows Alert and exports to Documents directory
-//		AskAlert(title: "Export results?", text: """
-//			This action will copy the internal database to the app's local Documents directory. You can use the Files app to access the database file.
-//
-//			Note: This will make your DNS requests available to other apps!
-//		""", buttonText: "Export") {
-//			do {
-//				let dest = try SQLiteDatabase.export()
-//				let folder = dest.deletingLastPathComponent()
-//				let out = folder.lastPathComponent + "/" + dest.lastPathComponent
-//				Alert(title: "Successful", text: "File exported to '\(out)'", buttonText: "OK").presentIn(self)
-//			} catch {
-//				ErrorAlert(error).presentIn(self)
-//			}
-//		}.presentIn(self)
 	}
 	
 	@IBAction func resetTutorialAlerts(_ sender: UIButton) {
@@ -64,7 +42,10 @@ class TVCSettings: UITableViewController {
 			"You are about to delete all results that have been logged in the past. " +
 			"Your preferences for blocked and ignored domains are preserved.\n" +
 			"Continue?", buttonText: "Delete", buttonStyle: .destructive) { _ in
-			DBWrp.deleteHistory()
+				DispatchQueue.global().async {
+					try? AppDB?.dnsLogsDeleteAll()
+					NotifyLogHistoryReset.postAsyncMain()
+				}
 		}.presentIn(self)
 	}