[AltStore] Adds LaunchViewController to async load database before UI appears

AltStore/AppDelegate.swift

@@ -53,21 +53,6 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         
         ServerManager.shared.startDiscovering()
         
-        DatabaseManager.shared.start { (error) in
-            if let error = error
-            {
-                print("Failed to start DatabaseManager.", error)
-            }
-            else
-            {
-                print("Started DatabaseManager")
-                
-                DispatchQueue.main.async {
-                    AppManager.shared.update()
-                }
-            }
-        }
-        
         if UserDefaults.standard.firstLaunch == nil
         {
             Keychain.shared.reset()

AltStore/Base.lproj/Main.storyboard

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="49e-Tb-3d3">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="wKh-xq-NuP">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
@@ -11,6 +11,24 @@
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
+        <!--Launch View Controller-->
+        <scene sceneID="q24-yd-v7v">
+            <objects>
+                <viewController id="wKh-xq-NuP" customClass="LaunchViewController" customModule="AltStore" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="G9E-Qs-gFM">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <viewLayoutGuide key="safeArea" id="sZd-sc-Bvn"/>
+                    </view>
+                    <connections>
+                        <segue destination="49e-Tb-3d3" kind="presentation" identifier="finishLaunching" modalTransitionStyle="crossDissolve" id="6Ov-Kc-Van"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="vOq-mm-rY5" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-806" y="0.0"/>
+        </scene>
         <!--Tab Bar Controller-->
         <scene sceneID="yl2-sM-qoP">
             <objects>

AltStore/LaunchViewController.swift

@@ -0,0 +1,51 @@
+//
+//  LaunchViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/30/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+import Roxas
+
+class LaunchViewController: RSTLaunchViewController
+{
+    override var launchConditions: [RSTLaunchCondition] {
+        let isDatabaseStarted = RSTLaunchCondition(condition: { DatabaseManager.shared.isStarted }) { (completionHandler) in
+            DatabaseManager.shared.start(completionHandler: completionHandler)
+        }
+
+        return [isDatabaseStarted]
+    }
+}
+
+extension LaunchViewController
+{
+    override func handleLaunchError(_ error: Error)
+    {
+        do
+        {
+            throw error
+        }
+        catch let error as NSError
+        {
+            let title = error.userInfo[NSLocalizedFailureErrorKey] as? String ?? NSLocalizedString("Unable to Launch AltStore", comment: "")
+            
+            let alertController = UIAlertController(title: title, message: error.localizedDescription, preferredStyle: .alert)
+            alertController.addAction(UIAlertAction(title: NSLocalizedString("Retry", comment: ""), style: .default, handler: { (action) in
+                self.handleLaunchConditions()
+            }))
+            self.present(alertController, animated: true, completion: nil)
+        }
+    }
+    
+    override func finishLaunching()
+    {
+        super.finishLaunching()
+        
+        AppManager.shared.update()
+        
+        self.performSegue(withIdentifier: "finishLaunching", sender: nil)
+    }
+}