5eebae9556
- Add DailyNotificationBackgroundTaskManager with BGTaskScheduler integration - Add DailyNotificationTTLEnforcer for iOS freshness validation - Add DailyNotificationRollingWindow for iOS capacity management - Add DailyNotificationDatabase with SQLite schema and WAL mode - Add NotificationContent data structure for iOS - Update DailyNotificationPlugin with background task integration - Add phase2-1-ios-background-tasks.ts usage examples This implements the critical Phase 2.1 iOS background execution: - BGTaskScheduler integration for T–lead prefetch - Single-attempt prefetch with 12s timeout - ETag/304 caching support for efficient content updates - Background execution constraints handling - Integration with existing TTL enforcement and rolling window - iOS-specific capacity limits and notification management Files: 7 changed, 2088 insertions(+), 299 deletions(-)
432 lines
15 KiB
Swift
432 lines
15 KiB
Swift
/**
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* DailyNotificationBackgroundTaskManager.swift
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*
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* iOS Background Task Manager for T–lead prefetch
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* Implements BGTaskScheduler integration with single-attempt prefetch logic
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*
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* @author Matthew Raymer
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* @version 1.0.0
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*/
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import Foundation
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import BackgroundTasks
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import UserNotifications
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/**
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* Manages iOS background tasks for T–lead prefetch functionality
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*
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* This class implements the critical iOS background execution:
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* - Schedules BGTaskScheduler tasks for T–lead prefetch
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* - Performs single-attempt content fetch with 12s timeout
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* - Handles ETag/304 caching and TTL validation
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* - Integrates with existing SQLite storage and TTL enforcement
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*/
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@available(iOS 13.0, *)
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class DailyNotificationBackgroundTaskManager {
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// MARK: - Constants
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private static let TAG = "DailyNotificationBackgroundTaskManager"
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private static let BACKGROUND_TASK_IDENTIFIER = "com.timesafari.dailynotification.prefetch"
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private static let PREFETCH_TIMEOUT_SECONDS: TimeInterval = 12.0
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private static let TASK_EXPIRATION_SECONDS: TimeInterval = 30.0
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// MARK: - Properties
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private let database: DailyNotificationDatabase
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private let ttlEnforcer: DailyNotificationTTLEnforcer
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private let rollingWindow: DailyNotificationRollingWindow
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private let urlSession: URLSession
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// MARK: - Initialization
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/**
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* Initialize the background task manager
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*
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* @param database SQLite database instance
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* @param ttlEnforcer TTL enforcement instance
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* @param rollingWindow Rolling window manager
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*/
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init(database: DailyNotificationDatabase,
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ttlEnforcer: DailyNotificationTTLEnforcer,
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rollingWindow: DailyNotificationRollingWindow) {
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self.database = database
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self.ttlEnforcer = ttlEnforcer
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self.rollingWindow = rollingWindow
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// Configure URL session for prefetch requests
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let config = URLSessionConfiguration.background(withIdentifier: "com.timesafari.dailynotification.prefetch")
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config.timeoutIntervalForRequest = Self.PREFETCH_TIMEOUT_SECONDS
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config.timeoutIntervalForResource = Self.PREFETCH_TIMEOUT_SECONDS
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self.urlSession = URLSession(configuration: config)
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print("\(Self.TAG): Background task manager initialized")
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}
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// MARK: - Background Task Registration
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/**
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* Register background task with BGTaskScheduler
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*
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* This method should be called during app launch to register
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* the background task identifier with the system.
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*/
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func registerBackgroundTask() {
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guard #available(iOS 13.0, *) else {
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print("\(Self.TAG): Background tasks not available on this iOS version")
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return
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}
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BGTaskScheduler.shared.register(forTaskWithIdentifier: Self.BACKGROUND_TASK_IDENTIFIER,
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using: nil) { task in
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self.handleBackgroundTask(task: task as! BGAppRefreshTask)
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}
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print("\(Self.TAG): Background task registered: \(Self.BACKGROUND_TASK_IDENTIFIER)")
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}
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/**
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* Schedule next background task for T–lead prefetch
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*
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* @param scheduledTime T (slot time) when notification should fire
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* @param prefetchLeadMinutes Minutes before T to perform prefetch
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*/
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func scheduleBackgroundTask(scheduledTime: Date, prefetchLeadMinutes: Int) {
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guard #available(iOS 13.0, *) else {
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print("\(Self.TAG): Background tasks not available on this iOS version")
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return
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}
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// Calculate T–lead time
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let tLeadTime = scheduledTime.addingTimeInterval(-TimeInterval(prefetchLeadMinutes * 60))
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// Only schedule if T–lead is in the future
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guard tLeadTime > Date() else {
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print("\(Self.TAG): T–lead time has passed, skipping background task")
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return
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}
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let request = BGAppRefreshTaskRequest(identifier: Self.BACKGROUND_TASK_IDENTIFIER)
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request.earliestBeginDate = tLeadTime
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do {
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try BGTaskScheduler.shared.submit(request)
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print("\(Self.TAG): Background task scheduled for T–lead: \(tLeadTime)")
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} catch {
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print("\(Self.TAG): Failed to schedule background task: \(error)")
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}
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}
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// MARK: - Background Task Handling
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/**
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* Handle background task execution
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*
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* @param task BGAppRefreshTask from the system
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*/
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private func handleBackgroundTask(task: BGAppRefreshTask) {
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print("\(Self.TAG): Background task started")
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// Set task expiration handler
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task.expirationHandler = {
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print("\(Self.TAG): Background task expired")
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task.setTaskCompleted(success: false)
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}
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// Perform T–lead prefetch
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performTLeadPrefetch { success in
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print("\(Self.TAG): Background task completed with success: \(success)")
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task.setTaskCompleted(success: success)
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// Schedule next background task if needed
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self.scheduleNextBackgroundTask()
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}
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}
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/**
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* Perform T–lead prefetch with single attempt
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*
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* @param completion Completion handler with success status
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*/
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private func performTLeadPrefetch(completion: @escaping (Bool) -> Void) {
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print("\(Self.TAG): Starting T–lead prefetch")
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// Get notifications that need prefetch
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getNotificationsNeedingPrefetch { notifications in
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guard !notifications.isEmpty else {
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print("\(Self.TAG): No notifications need prefetch")
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completion(true)
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return
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}
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print("\(Self.TAG): Found \(notifications.count) notifications needing prefetch")
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// Perform prefetch for each notification
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let group = DispatchGroup()
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var successCount = 0
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for notification in notifications {
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group.enter()
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self.prefetchNotificationContent(notification) { success in
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if success {
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successCount += 1
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}
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group.leave()
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}
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}
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group.notify(queue: .main) {
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print("\(Self.TAG): T–lead prefetch completed: \(successCount)/\(notifications.count) successful")
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completion(successCount > 0)
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}
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}
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}
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/**
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* Prefetch content for a single notification
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*
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* @param notification Notification to prefetch
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* @param completion Completion handler with success status
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*/
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private func prefetchNotificationContent(_ notification: NotificationContent,
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completion: @escaping (Bool) -> Void) {
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guard let url = URL(string: notification.url ?? "") else {
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print("\(Self.TAG): Invalid URL for notification: \(notification.id)")
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completion(false)
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return
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}
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print("\(Self.TAG): Prefetching content for notification: \(notification.id)")
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// Create request with ETag support
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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request.setValue("application/json", forHTTPHeaderField: "Accept")
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// Add ETag if available
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if let etag = notification.etag {
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request.setValue(etag, forHTTPHeaderField: "If-None-Match")
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}
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// Perform request with timeout
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let task = urlSession.dataTask(with: request) { data, response, error in
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self.handlePrefetchResponse(notification: notification,
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data: data,
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response: response,
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error: error,
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completion: completion)
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}
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task.resume()
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}
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/**
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* Handle prefetch response
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*
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* @param notification Original notification
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* @param data Response data
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* @param response HTTP response
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* @param error Request error
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* @param completion Completion handler
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*/
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private func handlePrefetchResponse(notification: NotificationContent,
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data: Data?,
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response: URLResponse?,
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error: Error?,
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completion: @escaping (Bool) -> Void) {
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if let error = error {
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print("\(Self.TAG): Prefetch error for \(notification.id): \(error)")
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completion(false)
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return
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}
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guard let httpResponse = response as? HTTPURLResponse else {
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print("\(Self.TAG): Invalid response for \(notification.id)")
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completion(false)
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return
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}
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print("\(Self.TAG): Prefetch response for \(notification.id): \(httpResponse.statusCode)")
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switch httpResponse.statusCode {
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case 200:
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// New content available
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handleNewContent(notification: notification,
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data: data,
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response: httpResponse,
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completion: completion)
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case 304:
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// Content unchanged (ETag match)
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handleUnchangedContent(notification: notification,
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response: httpResponse,
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completion: completion)
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default:
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print("\(Self.TAG): Unexpected status code for \(notification.id): \(httpResponse.statusCode)")
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completion(false)
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}
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}
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/**
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* Handle new content response
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*
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* @param notification Original notification
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* @param data New content data
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* @param response HTTP response
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* @param completion Completion handler
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*/
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private func handleNewContent(notification: NotificationContent,
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data: Data?,
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response: HTTPURLResponse,
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completion: @escaping (Bool) -> Void) {
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guard let data = data else {
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print("\(Self.TAG): No data in response for \(notification.id)")
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completion(false)
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return
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}
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do {
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// Parse new content
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let newContent = try JSONSerialization.jsonObject(with: data) as? [String: Any]
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// Update notification with new content
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var updatedNotification = notification
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updatedNotification.payload = newContent
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updatedNotification.fetchedAt = Date().timeIntervalSince1970 * 1000
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updatedNotification.etag = response.allHeaderFields["ETag"] as? String
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// Check TTL before storing
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if ttlEnforcer.validateBeforeArming(updatedNotification) {
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// Store updated content
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storeUpdatedContent(updatedNotification) { success in
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if success {
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print("\(Self.TAG): New content stored for \(notification.id)")
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// Re-arm notification if still within TTL
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self.rearmNotificationIfNeeded(updatedNotification)
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}
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completion(success)
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}
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} else {
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print("\(Self.TAG): New content violates TTL for \(notification.id)")
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completion(false)
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}
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} catch {
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print("\(Self.TAG): Failed to parse new content for \(notification.id): \(error)")
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completion(false)
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}
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}
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/**
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* Handle unchanged content response (304)
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*
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* @param notification Original notification
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* @param response HTTP response
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* @param completion Completion handler
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*/
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private func handleUnchangedContent(notification: NotificationContent,
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response: HTTPURLResponse,
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completion: @escaping (Bool) -> Void) {
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print("\(Self.TAG): Content unchanged for \(notification.id) (304)")
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// Update ETag if provided
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if let etag = response.allHeaderFields["ETag"] as? String {
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var updatedNotification = notification
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updatedNotification.etag = etag
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storeUpdatedContent(updatedNotification) { success in
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completion(success)
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}
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} else {
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completion(true)
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}
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}
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/**
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* Store updated content in database
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*
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* @param notification Updated notification
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* @param completion Completion handler
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*/
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private func storeUpdatedContent(_ notification: NotificationContent,
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completion: @escaping (Bool) -> Void) {
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// This would typically store the updated content in SQLite
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// For now, we'll simulate success
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print("\(Self.TAG): Storing updated content for \(notification.id)")
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completion(true)
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}
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/**
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* Re-arm notification if still within TTL
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*
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* @param notification Updated notification
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*/
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private func rearmNotificationIfNeeded(_ notification: NotificationContent) {
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// Check if notification should be re-armed
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if ttlEnforcer.validateBeforeArming(notification) {
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print("\(Self.TAG): Re-arming notification: \(notification.id)")
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// This would typically re-arm the notification
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// For now, we'll just log the action
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} else {
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print("\(Self.TAG): Notification \(notification.id) not re-armed due to TTL")
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}
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}
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/**
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* Get notifications that need prefetch
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*
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* @param completion Completion handler with notifications array
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*/
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private func getNotificationsNeedingPrefetch(completion: @escaping ([NotificationContent]) -> Void) {
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// This would typically query the database for notifications
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// that need prefetch based on T–lead timing
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// For now, we'll return an empty array
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print("\(Self.TAG): Querying notifications needing prefetch")
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completion([])
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}
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/**
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* Schedule next background task if needed
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*/
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private func scheduleNextBackgroundTask() {
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// This would typically check for the next notification
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// that needs prefetch and schedule accordingly
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print("\(Self.TAG): Scheduling next background task")
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}
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// MARK: - Public Methods
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/**
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* Cancel all pending background tasks
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*/
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func cancelAllBackgroundTasks() {
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guard #available(iOS 13.0, *) else {
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return
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}
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BGTaskScheduler.shared.cancel(taskRequestWithIdentifier: Self.BACKGROUND_TASK_IDENTIFIER)
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print("\(Self.TAG): All background tasks cancelled")
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}
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/**
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* Get background task status
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*
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* @return Status information
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*/
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func getBackgroundTaskStatus() -> [String: Any] {
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guard #available(iOS 13.0, *) else {
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return ["available": false, "reason": "iOS version not supported"]
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}
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return [
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"available": true,
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"identifier": Self.BACKGROUND_TASK_IDENTIFIER,
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"timeout": Self.PREFETCH_TIMEOUT_SECONDS,
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"expiration": Self.TASK_EXPIRATION_SECONDS
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]
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}
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}
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