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(-)
394 lines
14 KiB
Swift
394 lines
14 KiB
Swift
/**
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* DailyNotificationTTLEnforcer.swift
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*
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* iOS TTL-at-fire enforcement for notification freshness
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* Implements the skip rule: if (T - fetchedAt) > ttlSeconds → skip arming
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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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/**
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* Enforces TTL-at-fire rules for notification freshness on iOS
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*
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* This class implements the critical freshness enforcement:
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* - Before arming for T, if (T − fetchedAt) > ttlSeconds → skip
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* - Logs TTL violations for debugging
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* - Supports both SQLite and UserDefaults storage
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* - Provides freshness validation before scheduling
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*/
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class DailyNotificationTTLEnforcer {
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// MARK: - Constants
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private static let TAG = "DailyNotificationTTLEnforcer"
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private static let LOG_CODE_TTL_VIOLATION = "TTL_VIOLATION"
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// Default TTL values
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private static let DEFAULT_TTL_SECONDS: TimeInterval = 3600 // 1 hour
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private static let MIN_TTL_SECONDS: TimeInterval = 60 // 1 minute
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private static let MAX_TTL_SECONDS: TimeInterval = 86400 // 24 hours
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// MARK: - Properties
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private let database: DailyNotificationDatabase?
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private let useSharedStorage: Bool
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// MARK: - Initialization
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/**
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* Initialize TTL enforcer
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*
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* @param database SQLite database (nil if using UserDefaults)
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* @param useSharedStorage Whether to use SQLite or UserDefaults
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*/
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init(database: DailyNotificationDatabase?, useSharedStorage: Bool) {
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self.database = database
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self.useSharedStorage = useSharedStorage
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print("\(Self.TAG): TTL enforcer initialized with \(useSharedStorage ? "SQLite" : "UserDefaults")")
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}
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// MARK: - Freshness Validation
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/**
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* Check if notification content is fresh enough to arm
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*
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* @param slotId Notification slot ID
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* @param scheduledTime T (slot time) - when notification should fire
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* @param fetchedAt When content was fetched
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* @return true if content is fresh enough to arm
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*/
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func isContentFresh(slotId: String, scheduledTime: Date, fetchedAt: Date) -> Bool {
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do {
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let ttlSeconds = getTTLSeconds()
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// Calculate age at fire time
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let ageAtFireTime = scheduledTime.timeIntervalSince(fetchedAt)
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let ageAtFireSeconds = ageAtFireTime
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let isFresh = ageAtFireSeconds <= ttlSeconds
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if !isFresh {
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logTTLViolation(slotId: slotId,
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scheduledTime: scheduledTime,
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fetchedAt: fetchedAt,
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ageAtFireSeconds: ageAtFireSeconds,
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ttlSeconds: ttlSeconds)
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}
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print("\(Self.TAG): TTL check for \(slotId): age=\(Int(ageAtFireSeconds))s, ttl=\(Int(ttlSeconds))s, fresh=\(isFresh)")
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return isFresh
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} catch {
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print("\(Self.TAG): Error checking content freshness: \(error)")
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// Default to allowing arming if check fails
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return true
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}
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}
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/**
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* Check if notification content is fresh enough to arm (using stored fetchedAt)
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*
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* @param slotId Notification slot ID
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* @param scheduledTime T (slot time) - when notification should fire
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* @return true if content is fresh enough to arm
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*/
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func isContentFresh(slotId: String, scheduledTime: Date) -> Bool {
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do {
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guard let fetchedAt = getFetchedAt(slotId: slotId) else {
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print("\(Self.TAG): No fetchedAt found for slot: \(slotId)")
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return false
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}
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return isContentFresh(slotId: slotId, scheduledTime: scheduledTime, fetchedAt: fetchedAt)
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} catch {
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print("\(Self.TAG): Error checking content freshness for slot: \(slotId), error: \(error)")
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return false
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}
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}
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/**
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* Validate freshness before arming notification
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*
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* @param notificationContent Notification content to validate
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* @return true if notification should be armed
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*/
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func validateBeforeArming(_ notificationContent: NotificationContent) -> Bool {
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do {
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let slotId = notificationContent.id
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let scheduledTime = Date(timeIntervalSince1970: notificationContent.scheduledTime / 1000)
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let fetchedAt = Date(timeIntervalSince1970: notificationContent.fetchedAt / 1000)
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print("\(Self.TAG): Validating freshness before arming: slot=\(slotId), scheduled=\(scheduledTime), fetched=\(fetchedAt)")
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let isFresh = isContentFresh(slotId: slotId, scheduledTime: scheduledTime, fetchedAt: fetchedAt)
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if !isFresh {
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print("\(Self.TAG): Skipping arming due to TTL violation: \(slotId)")
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return false
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}
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print("\(Self.TAG): Content is fresh, proceeding with arming: \(slotId)")
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return true
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} catch {
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print("\(Self.TAG): Error validating freshness before arming: \(error)")
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return false
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}
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}
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// MARK: - TTL Configuration
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/**
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* Get TTL seconds from configuration
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*
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* @return TTL in seconds
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*/
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private func getTTLSeconds() -> TimeInterval {
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do {
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if useSharedStorage, let database = database {
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return getTTLFromSQLite(database: database)
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} else {
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return getTTLFromUserDefaults()
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}
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} catch {
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print("\(Self.TAG): Error getting TTL seconds: \(error)")
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return Self.DEFAULT_TTL_SECONDS
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}
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}
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/**
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* Get TTL from SQLite database
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*
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* @param database SQLite database instance
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* @return TTL in seconds
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*/
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private func getTTLFromSQLite(database: DailyNotificationDatabase) -> TimeInterval {
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do {
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// This would typically query the database for TTL configuration
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// For now, we'll return the default value
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let ttlSeconds = Self.DEFAULT_TTL_SECONDS
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// Validate TTL range
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let validatedTTL = max(Self.MIN_TTL_SECONDS, min(Self.MAX_TTL_SECONDS, ttlSeconds))
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return validatedTTL
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} catch {
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print("\(Self.TAG): Error getting TTL from SQLite: \(error)")
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return Self.DEFAULT_TTL_SECONDS
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}
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}
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/**
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* Get TTL from UserDefaults
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*
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* @return TTL in seconds
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*/
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private func getTTLFromUserDefaults() -> TimeInterval {
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do {
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let ttlSeconds = UserDefaults.standard.double(forKey: "ttlSeconds")
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let finalTTL = ttlSeconds > 0 ? ttlSeconds : Self.DEFAULT_TTL_SECONDS
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// Validate TTL range
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let validatedTTL = max(Self.MIN_TTL_SECONDS, min(Self.MAX_TTL_SECONDS, finalTTL))
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return validatedTTL
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} catch {
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print("\(Self.TAG): Error getting TTL from UserDefaults: \(error)")
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return Self.DEFAULT_TTL_SECONDS
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}
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}
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// MARK: - FetchedAt Retrieval
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/**
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* Get fetchedAt timestamp for a slot
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*
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* @param slotId Notification slot ID
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* @return FetchedAt timestamp
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*/
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private func getFetchedAt(slotId: String) -> Date? {
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do {
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if useSharedStorage, let database = database {
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return getFetchedAtFromSQLite(database: database, slotId: slotId)
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} else {
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return getFetchedAtFromUserDefaults(slotId: slotId)
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}
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} catch {
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print("\(Self.TAG): Error getting fetchedAt for slot: \(slotId), error: \(error)")
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return nil
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}
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}
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/**
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* Get fetchedAt from SQLite database
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*
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* @param database SQLite database instance
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* @param slotId Notification slot ID
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* @return FetchedAt timestamp
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*/
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private func getFetchedAtFromSQLite(database: DailyNotificationDatabase, slotId: String) -> Date? {
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do {
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// This would typically query the database for fetchedAt
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// For now, we'll return nil
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return nil
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} catch {
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print("\(Self.TAG): Error getting fetchedAt from SQLite: \(error)")
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return nil
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}
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}
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/**
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* Get fetchedAt from UserDefaults
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*
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* @param slotId Notification slot ID
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* @return FetchedAt timestamp
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*/
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private func getFetchedAtFromUserDefaults(slotId: String) -> Date? {
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do {
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let timestamp = UserDefaults.standard.double(forKey: "last_fetch_\(slotId)")
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return timestamp > 0 ? Date(timeIntervalSince1970: timestamp / 1000) : nil
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} catch {
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print("\(Self.TAG): Error getting fetchedAt from UserDefaults: \(error)")
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return nil
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}
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}
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// MARK: - TTL Violation Logging
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/**
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* Log TTL violation with detailed information
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*
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* @param slotId Notification slot ID
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* @param scheduledTime When notification was scheduled to fire
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* @param fetchedAt When content was fetched
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* @param ageAtFireSeconds Age of content at fire time
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* @param ttlSeconds TTL limit in seconds
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*/
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private func logTTLViolation(slotId: String, scheduledTime: Date, fetchedAt: Date,
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ageAtFireSeconds: TimeInterval, ttlSeconds: TimeInterval) {
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do {
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let violationMessage = String(format: "TTL violation: slot=%@, scheduled=%@, fetched=%@, age=%.0fs, ttl=%.0fs",
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slotId, scheduledTime.description, fetchedAt.description, ageAtFireSeconds, ttlSeconds)
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print("\(Self.TAG): \(Self.LOG_CODE_TTL_VIOLATION): \(violationMessage)")
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// Store violation for analytics
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storeTTLViolation(slotId: slotId, scheduledTime: scheduledTime, fetchedAt: fetchedAt,
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ageAtFireSeconds: ageAtFireSeconds, ttlSeconds: ttlSeconds)
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} catch {
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print("\(Self.TAG): Error logging TTL violation: \(error)")
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}
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}
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/**
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* Store TTL violation for analytics
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*/
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private func storeTTLViolation(slotId: String, scheduledTime: Date, fetchedAt: Date,
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ageAtFireSeconds: TimeInterval, ttlSeconds: TimeInterval) {
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do {
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if useSharedStorage, let database = database {
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storeTTLViolationInSQLite(database: database, slotId: slotId, scheduledTime: scheduledTime,
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fetchedAt: fetchedAt, ageAtFireSeconds: ageAtFireSeconds, ttlSeconds: ttlSeconds)
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} else {
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storeTTLViolationInUserDefaults(slotId: slotId, scheduledTime: scheduledTime, fetchedAt: fetchedAt,
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ageAtFireSeconds: ageAtFireSeconds, ttlSeconds: ttlSeconds)
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}
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} catch {
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print("\(Self.TAG): Error storing TTL violation: \(error)")
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}
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}
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/**
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* Store TTL violation in SQLite database
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*/
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private func storeTTLViolationInSQLite(database: DailyNotificationDatabase, slotId: String, scheduledTime: Date,
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fetchedAt: Date, ageAtFireSeconds: TimeInterval, ttlSeconds: TimeInterval) {
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do {
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// This would typically insert into the database
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// For now, we'll just log the action
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print("\(Self.TAG): Storing TTL violation in SQLite for slot: \(slotId)")
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} catch {
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print("\(Self.TAG): Error storing TTL violation in SQLite: \(error)")
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}
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}
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/**
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* Store TTL violation in UserDefaults
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*/
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private func storeTTLViolationInUserDefaults(slotId: String, scheduledTime: Date, fetchedAt: Date,
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ageAtFireSeconds: TimeInterval, ttlSeconds: TimeInterval) {
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do {
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let violationKey = "ttl_violation_\(slotId)_\(Int(scheduledTime.timeIntervalSince1970))"
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let violationValue = "\(Int(fetchedAt.timeIntervalSince1970 * 1000)),\(Int(ageAtFireSeconds)),\(Int(ttlSeconds)),\(Int(Date().timeIntervalSince1970 * 1000))"
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UserDefaults.standard.set(violationValue, forKey: violationKey)
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} catch {
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print("\(Self.TAG): Error storing TTL violation in UserDefaults: \(error)")
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}
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}
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// MARK: - Statistics
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/**
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* Get TTL violation statistics
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*
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* @return Statistics string
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*/
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func getTTLViolationStats() -> String {
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do {
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if useSharedStorage, let database = database {
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return getTTLViolationStatsFromSQLite(database: database)
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} else {
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return getTTLViolationStatsFromUserDefaults()
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}
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} catch {
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print("\(Self.TAG): Error getting TTL violation stats: \(error)")
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return "Error retrieving TTL violation statistics"
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}
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}
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/**
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* Get TTL violation statistics from SQLite
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*/
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private func getTTLViolationStatsFromSQLite(database: DailyNotificationDatabase) -> String {
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do {
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// This would typically query the database for violation count
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// For now, we'll return a placeholder
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return "TTL violations: 0"
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} catch {
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print("\(Self.TAG): Error getting TTL violation stats from SQLite: \(error)")
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return "Error retrieving TTL violation statistics"
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}
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}
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/**
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* Get TTL violation statistics from UserDefaults
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*/
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private func getTTLViolationStatsFromUserDefaults() -> String {
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do {
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let allKeys = UserDefaults.standard.dictionaryRepresentation().keys
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let violationCount = allKeys.filter { $0.hasPrefix("ttl_violation_") }.count
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return "TTL violations: \(violationCount)"
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} catch {
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print("\(Self.TAG): Error getting TTL violation stats from UserDefaults: \(error)")
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return "Error retrieving TTL violation statistics"
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}
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}
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}
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