Mark notifications on Mastodon web frontend as read once displayed

Fixes #357

Packages/Pachyderm/Sources/Pachyderm/Model/TimelineMarkers.swift

@@ -7,26 +7,53 @@
 
 import Foundation
 
-public struct TimelineMarkers: Decodable, Sendable {
-    public let home: Marker?
-    public let notifications: Marker?
+public struct TimelineMarkers {
+    private init() {}
     
-    public static func request(timelines: [Timeline]) -> Request<TimelineMarkers> {
-        return Request(method: .get, path: "/api/v1/markers", queryParameters: "timeline[]" => timelines.map(\.rawValue))
+    public static func request<T: TimelineMarkerType>(timeline: T) -> Request<TimelineMarker<T.Payload>> {
+        Request(method: .get, path: "/api/v1/markers", queryParameters: ["timeline[]" => T.name])
     }
     
-    public static func update(timeline: Timeline, lastReadID: String) -> Request<Empty> {
-        return Request(method: .post, path: "/api/v1/markers", body: ParametersBody([
-            "\(timeline.rawValue)[last_read_id]" => lastReadID,
+    public static func update<T: TimelineMarkerType>(timeline: T, lastReadID: String) -> Request<Empty> {
+        Request(method: .post, path: "/api/v1/markers", body: ParametersBody([
+            "\(T.name)[last_read_id]" => lastReadID
         ]))
     }
+}
 
-    public enum Timeline: String {
-        case home
-        case notifications
+public struct TimelineMarker<Payload: TimelineMarkerTypePayload>: Decodable, Sendable {
+    let payload: Payload
+    
+    public var lastReadID: String {
+        payload.payload.lastReadID
+    }
+    public var version: Int {
+        payload.payload.version
+    }
+    public var updatedAt: Date {
+        payload.payload.updatedAt
     }
 
-    public struct Marker: Decodable, Sendable {
+    public init(from decoder: any Decoder) throws {
+        self.payload = try Payload(from: decoder)
+    }
+}
+
+public protocol TimelineMarkerTypePayload: Decodable, Sendable {
+    var payload: MarkerPayload { get }
+}
+
+public struct HomeMarkerPayload: TimelineMarkerTypePayload {
+    public var home: MarkerPayload
+    public var payload: MarkerPayload { home }
+}
+
+public struct NotificationsMarkerPayload: TimelineMarkerTypePayload {
+    public var notifications: MarkerPayload
+    public var payload: MarkerPayload { notifications }
+}
+
+public struct MarkerPayload: Decodable, Sendable {
     public let lastReadID: String
     public let version: Int
     public let updatedAt: Date
@@ -36,5 +63,27 @@ public struct TimelineMarkers: Decodable, Sendable {
         case version
         case updatedAt = "updated_at"
     }
-    }
+}
+
+public protocol TimelineMarkerType {
+    static var name: String { get }
+    associatedtype Payload: TimelineMarkerTypePayload
+}
+
+extension TimelineMarkerType where Self == HomeMarker {
+    public static var home: Self { .init() }
+}
+
+extension TimelineMarkerType where Self == NotificationsMarker {
+    public static var notifications: Self { .init() }
+}
+
+public struct HomeMarker: TimelineMarkerType {
+    public typealias Payload = HomeMarkerPayload
+    public static var name: String { "home" }
+}
+
+public struct NotificationsMarker: TimelineMarkerType {
+    public typealias Payload = NotificationsMarkerPayload
+    public static var name: String { "notifications" }
 }

Tusker/Screens/Notifications/NotificationsCollectionViewController.swift

@@ -12,6 +12,9 @@ import Combine
 #if canImport(Sentry)
 import Sentry
 #endif
+import OSLog
+
+private let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "NotificationsCVC")
 
 class NotificationsCollectionViewController: UIViewController, TimelineLikeCollectionViewController, CollectionViewController {
     
@@ -32,6 +35,9 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
     private var newer: RequestRange?
     private var older: RequestRange?
     
+    var updatesNotificationsMarker: Bool = false
+    private var newestDisplayedNotification: Item?
+    
     init(allowedTypes: [Pachyderm.Notification.Kind], mastodonController: MastodonController) {
         self.allowedTypes = allowedTypes
         self.mastodonController = mastodonController
@@ -205,6 +211,12 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
         }
     }
     
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        
+        updateNotificationsMarkerIfNecessary()
+    }
+    
     @objc func refresh() {
         Task { @MainActor in
             if case .notLoadedInitial = controller.state {
@@ -311,6 +323,23 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
         await apply(snapshot, animatingDifferences: true)
     }
     
+    private func updateNotificationsMarkerIfNecessary() {
+        guard updatesNotificationsMarker,
+              case let .group(group, _, _) = newestDisplayedNotification,
+              let notification = group.notifications.first else {
+            return
+        }
+        logger.debug("Updating notifications marker with \(notification.id)")
+        Task {
+            let req = TimelineMarkers.update(timeline: .notifications, lastReadID: notification.id)
+            do {
+                _ = try await mastodonController.run(req)
+            } catch {
+                logger.error("Failed to update notifications marker: \(String(describing: error))")
+            }
+        }
+    }
+    
 }
 
 extension NotificationsCollectionViewController {
@@ -545,6 +574,21 @@ extension NotificationsCollectionViewController: UICollectionViewDelegate {
         guard case .notifications = dataSource.sectionIdentifier(for: indexPath.section) else {
             return
         }
+        
+        if updatesNotificationsMarker {
+            let shouldUpdateNewestDisplayedNotification: Bool
+            if let newestDisplayedNotification,
+               let currentNewestIndexPath = dataSource.indexPath(for: newestDisplayedNotification) {
+                shouldUpdateNewestDisplayedNotification = indexPath < currentNewestIndexPath
+            } else {
+                shouldUpdateNewestDisplayedNotification = true
+            }
+            if shouldUpdateNewestDisplayedNotification,
+               let item = dataSource.itemIdentifier(for: indexPath) {
+                newestDisplayedNotification = item
+            }
+        }
+        
         let itemsInSection = collectionView.numberOfItems(inSection: indexPath.section)
         if indexPath.row == itemsInSection - 1 {
             Task {
@@ -765,3 +809,9 @@ extension NotificationsCollectionViewController: StatusBarTappableViewController
         return .stop
     }
 }
+
+extension NotificationsCollectionViewController: BackgroundableViewController {
+    func sceneDidEnterBackground() {
+        updateNotificationsMarkerIfNecessary()
+    }
+}

Tusker/Screens/Notifications/NotificationsPageViewController.swift

@@ -24,6 +24,7 @@ class NotificationsPageViewController: SegmentedPageViewController<Notifications
             let vc = NotificationsCollectionViewController(allowedTypes: page.allowedTypes, mastodonController: mastodonController)
             vc.title = page.title
             vc.userActivity = page.userActivity(accountID: mastodonController.accountInfo!.id)
+            vc.updatesNotificationsMarker = page == .all
             return vc
         }
         

Tusker/Screens/Timeline/TimelineViewController.swift

@@ -387,16 +387,6 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
                     _ = try await mastodonController.run(req)
                 } catch {
                     stateRestorationLogger.error("TimelineViewController: failed to update timeline marker: \(String(describing: error))")
-                    
-                    #if canImport(Sentry)
-                    if let error = error as? Client.Error,
-                       case .networkError(_) = error.type {
-                        return
-                    }
-                    let event = Event(error: error)
-                    event.message = SentryMessage(formatted: "Failed to update timeline marker: \(String(describing: error))")
-                    SentrySDK.capture(event: event)
-                    #endif
                 }
             }
         }
@@ -573,12 +563,9 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     @MainActor
     private func restoreStatusesFromMarkerPosition() async -> Bool {
         do {
-            let (marker, _) = try await mastodonController.run(TimelineMarkers.request(timelines: [.home]))
-            guard let home = marker.home else {
-                return false
-            }
-            async let status = try await mastodonController.run(Client.getStatus(id: home.lastReadID)).0
-            async let olderStatuses = try await mastodonController.run(Client.getStatuses(timeline: .home, range: .before(id: home.lastReadID, count: Self.pageSize))).0
+            let (marker, _) = try await mastodonController.run(TimelineMarkers.request(timeline: .home))
+            async let status = try await mastodonController.run(Client.getStatus(id: marker.lastReadID)).0
+            async let olderStatuses = try await mastodonController.run(Client.getStatuses(timeline: .home, range: .before(id: marker.lastReadID, count: Self.pageSize))).0
             
             let allStatuses = try await [status] + olderStatuses
             await mastodonController.persistentContainer.addAll(statuses: allStatuses)
@@ -590,21 +577,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
             await apply(snapshot, animatingDifferences: false)
             collectionView.contentOffset = CGPoint(x: 0, y: -collectionView.adjustedContentInset.top)
             
-            stateRestorationLogger.debug("TimelineViewController: restored from timeline marker with last read ID: \(home.lastReadID)")
+            stateRestorationLogger.debug("TimelineViewController: restored from timeline marker with last read ID: \(marker.lastReadID)")
             
             return true
         } catch {
             stateRestorationLogger.error("TimelineViewController: failed to load from timeline marker: \(String(describing: error))")
-            
-            #if canImport(Sentry)
-            if let error = error as? Client.Error,
-               case .networkError(_) = error.type {
-                return false
-            }
-            let event = Event(error: error)
-            event.message = SentryMessage(formatted: "Failed to load from timeline marker: \(String(describing: error))")
-            SentrySDK.capture(event: event)
-            #endif
             return false
         }
     }