From f8eb356124cba8f5ef2faa53f113ba9248699429 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=C2=A0Buczek?= <michal.buczek@protonmail.com>
Date: Mon, 7 Dec 2020 18:56:56 +0100
Subject: [PATCH] Fix #3113: Fetch adblock data every 6 hours.

---
 Client/Application/Delegates/AppDelegate.swift     |  2 ++
 .../AdblockDebugMenuTableViewController.swift      | 14 ++++++++++++++
 Client/WebFilters/AdblockResourceDownloader.swift  | 14 ++++++++++++--
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/Client/Application/Delegates/AppDelegate.swift b/Client/Application/Delegates/AppDelegate.swift
index d5dbd5a4482..e241c24f1c8 100644
--- a/Client/Application/Delegates/AppDelegate.swift
+++ b/Client/Application/Delegates/AppDelegate.swift
@@ -478,6 +478,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UIViewControllerRestorati
         if let authInfo = KeychainWrapper.sharedAppContainerKeychain.authenticationInfo(), authInfo.isPasscodeRequiredImmediately {
             authenticator?.willEnterForeground()
         }
+        
+        AdblockResourceDownloader.shared.startLoading()
     }
     
     func applicationWillResignActive(_ application: UIApplication) {
diff --git a/Client/Frontend/Settings/AdblockDebugMenuTableViewController.swift b/Client/Frontend/Settings/AdblockDebugMenuTableViewController.swift
index d0a80c8fb72..98362cea80d 100644
--- a/Client/Frontend/Settings/AdblockDebugMenuTableViewController.swift
+++ b/Client/Frontend/Settings/AdblockDebugMenuTableViewController.swift
@@ -22,6 +22,7 @@ class AdblockDebugMenuTableViewController: TableViewController {
             if listNames.isEmpty { return }
             
             self.dataSource.sections = [self.actionsSection,
+                                        self.fetchSection,
                                         self.datesSection,
                                         self.bundledListsSection(names: listNames),
                                         self.downloadedListsSection(names: listNames)]
@@ -44,6 +45,19 @@ class AdblockDebugMenuTableViewController: TableViewController {
         return section
     }
     
+    private var fetchSection: Section {
+        var section = Section(footer: "Last time we pinged the server for new data. If adblock list hasn't changed `Last Time Updated` section does not update.")
+        let dateFormatter = DateFormatter().then {
+            $0.dateStyle = .short
+            $0.timeStyle = .short
+        }
+
+        section.rows = [.init(text: "Last fetch time", detailText:
+                                dateFormatter.string(from: AdblockResourceDownloader.shared.lastFetchDate))]
+        
+        return section
+    }
+    
     private var datesSection: Section {
         var section = Section(header: "Last time updated",
                               footer: "When the lists were last time updated on the device")
diff --git a/Client/WebFilters/AdblockResourceDownloader.swift b/Client/WebFilters/AdblockResourceDownloader.swift
index 954d8becde9..5d75c68dda4 100644
--- a/Client/WebFilters/AdblockResourceDownloader.swift
+++ b/Client/WebFilters/AdblockResourceDownloader.swift
@@ -34,9 +34,19 @@ class AdblockResourceDownloader {
         Preferences.Shields.useRegionAdBlock.observe(from: self)
     }
     
+    /// Initialized with year 1970 to force adblock fetch at first launch.
+    private(set) var lastFetchDate = Date(timeIntervalSince1970: 0)
+    
     func startLoading() {
-        AdblockResourceDownloader.shared.regionalAdblockResourcesSetup()
-        AdblockResourceDownloader.shared.generalAdblockResourcesSetup()
+        let now = Date()
+        let fetchInterval = AppConstants.buildChannel.isPublic ? 6.hours : 10.minutes
+        
+        if now.timeIntervalSince(lastFetchDate) >= fetchInterval {
+            lastFetchDate = now
+            
+            AdblockResourceDownloader.shared.regionalAdblockResourcesSetup()
+            AdblockResourceDownloader.shared.generalAdblockResourcesSetup()
+        }
     }
     
     func regionalAdblockResourcesSetup() {