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feat(ios): enhance background task handlers and documentation

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Enhance background task handlers with recovery logic and comprehensive
code documentation:

Background Task Handlers (Section 3.3):
- Enhance handleBackgroundFetch with recovery logic:
  - Verify scheduled notifications after fetch
  - Schedule next background task automatically
  - Improved expiration handling with graceful cleanup
- Enhance handleBackgroundNotify with recovery logic:
  - Verify scheduled notifications state
  - Prepare for next task scheduling
  - Improved expiration handling with graceful cleanup
- Add getNextScheduledNotificationTime() helper method
  - Wraps scheduler.getNextNotificationTime() with timeout
  - Used for automatic next task scheduling

Code Documentation (Section 10.1):
- Add comprehensive file-level documentation to ReactivationManager:
  - Purpose, features, architecture overview
  - Recovery scenarios supported
  - Error handling approach
  - Thread safety notes
  - Cross-references to requirements docs
- Add detailed method-level documentation:
  - performRecovery(): process, scenarios, error handling
  - detectScenario(): detection logic, error handling
  - performColdStartRecovery(): steps, return values
  - detectMissedNotifications(): criteria, error handling
  - verifyFutureNotifications(): verification process
  - rescheduleMissingNotification(): process, throws
  - handleTerminationRecovery(): comprehensive recovery
  - performBootRecovery(): boot recovery process
  - recordRecoveryHistory(): history recording
  - recordRecoveryFailure(): failure recording
  - detectBootScenario(): detection logic
  - updateLastLaunchTime(): storage details
  - verifyBGTaskRegistration(): diagnostic method
- Add @param, @return, @throws tags to all methods
- Document error handling behavior for all methods

Implementation Status (Section 10.2):
- Update ios/Plugin/README.md with current status:
  - Mark all completed features as ✅
  - Add new components (DAO classes, ReactivationManager)
  - Update version to 1.1.0
  - Add recovery scenarios supported
  - Update architecture overview
  - Add last updated date (2025-12-08)

Completes sections 3.3, 10.1, and 10.2 of iOS implementation checklist.
This commit is contained in:
Matthew
2025-12-09 19:09:07 -08:00
parent 3649e76c49
commit 332dfbad75
4 changed files with 430 additions and 86 deletions
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ios/Plugin/DailyNotificationReactivationManager.swift
+205 -31
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@@ -12,15 +12,49 @@ import BackgroundTasks
import CoreData
/**
* DailyNotificationReactivationManager.swift
*
* Manages recovery of notifications on app launch
* Phase 1: Cold start recovery only
*
* This class implements comprehensive recovery logic for iOS app lifecycle scenarios:
* - Cold Start Recovery: Detects and recovers missed notifications after app termination
* - Termination Recovery: Full recovery when app was terminated by system
* - Boot Recovery: Recovery after device reboot
* - Warm Start: Optimized path when no recovery needed
*
* Features:
* - Scenario detection (none, cold start, warm start, termination, boot)
* - Missed notification detection and marking
* - Future notification verification and rescheduling
* - Comprehensive error handling (non-fatal, graceful degradation)
* - Execution time tracking and metrics recording
* - History persistence via Core Data
*
* Implements:
* - [Plugin Requirements §3.1.2 - App Cold Start](../docs/alarms/03-plugin-requirements.md#312-app-cold-start) (iOS equivalent)
* Platform Reference: [iOS §3.1.1](../docs/alarms/01-platform-capability-reference.md#311-notifications-survive-app-termination)
* - [Plugin Requirements §3.1.3 - App Termination](../docs/alarms/03-plugin-requirements.md#313-app-termination) (iOS equivalent)
* - [Plugin Requirements §3.1.4 - Device Boot](../docs/alarms/03-plugin-requirements.md#314-device-boot) (iOS equivalent)
*
* Platform Reference:
* - [iOS §3.1.1](../docs/alarms/01-platform-capability-reference.md#311-notifications-survive-app-termination)
* - [iOS Recovery Scenario Mapping](../docs/ios-recovery-scenario-mapping.md)
*
* Error Handling:
* - All database errors are caught and handled gracefully (non-fatal)
* - All notification center errors are caught and handled gracefully (non-fatal)
* - All scheduling errors are caught and handled gracefully (non-fatal)
* - Partial results returned when some operations fail
* - App never crashes due to recovery errors
*
* Thread Safety:
* - All operations are async/await based
* - Recovery runs in background Task to avoid blocking app startup
* - Timeout protection (2 seconds default) prevents hanging
*
* @author Matthew Raymer
* @version 1.0.0 - Phase 1: Cold start recovery
* @version 1.0.0
* @created 2025-12-08
* @lastUpdated 2025-12-08
*/
class DailyNotificationReactivationManager {
@@ -62,19 +96,47 @@ class DailyNotificationReactivationManager {
/**
* Perform recovery on app launch
* Phase 3: Includes boot detection and recovery
*
* Scenario detection implemented:
* - .none: Empty database (first launch)
* - .coldStart: Notifications exist, may need verification
* - .warmStart: Notifications match DB state (optimization, no recovery)
* - .termination: App terminated, notifications cleared
* This is the main entry point for recovery operations. Called automatically
* when the plugin loads via DailyNotificationPlugin.load().
*
* Phase 3: Boot detection added
* Recovery Process:
* 1. Detects boot scenario (if device rebooted)
* 2. Detects recovery scenario (none, cold start, warm start, termination)
* 3. Performs appropriate recovery actions based on scenario
* 4. Records recovery metrics in Core Data history
*
* Runs asynchronously with timeout to avoid blocking app startup
* Scenario Detection:
* - `.none`: Empty database (first launch) - no recovery needed
* - `.coldStart`: Notifications exist, may need verification - performs recovery
* - `.warmStart`: Notifications match DB state - no recovery needed (optimization)
* - `.termination`: App terminated, notifications cleared - full recovery
* - `.boot`: Device rebooted - full recovery
*
* Rollback Safety: If recovery fails, app continues normally
* Error Handling:
* - All errors are caught and logged (non-fatal)
* - Recovery failures are recorded in history
* - App continues normally even if recovery fails
* - Partial results returned when some operations fail
*
* Performance:
* - Runs asynchronously in background Task
* - Timeout protection (2 seconds default) prevents hanging
* - Non-blocking: does not delay app startup
*
* Thread Safety:
* - Safe to call from any thread
* - All operations are async/await based
*
* @note This method is called automatically on app launch. Manual calls are
* generally not needed unless testing recovery scenarios.
*
* @throws Never throws - all errors are caught and handled internally
*
* @see detectScenario() for scenario detection logic
* @see performColdStartRecovery() for cold start recovery
* @see handleTerminationRecovery() for termination recovery
* @see performBootRecovery() for boot recovery
*/
func performRecovery() {
Task {
@@ -243,13 +305,35 @@ class DailyNotificationReactivationManager {
/**
* Perform cold start recovery
*
* Steps:
* 1. Detect missed notifications (scheduled_time < now, not delivered)
* 2. Mark missed notifications in database
* 3. Verify future notifications are scheduled
* 4. Reschedule missing future notifications
* Handles recovery when app was terminated but notifications may still exist
* in UNUserNotificationCenter. This is the most common recovery scenario.
*
* @return RecoveryResult with counts
* Recovery Steps:
* 1. Detect missed notifications (scheduled_time < now, not delivered)
* 2. Mark missed notifications in database (update delivery status)
* 3. Verify future notifications are scheduled in UNUserNotificationCenter
* 4. Reschedule any missing future notifications
*
* Error Handling:
* - Individual notification errors are caught and counted
* - Partial results returned if some operations fail
* - All errors logged but don't stop recovery process
*
* Performance:
* - Processes notifications in batches
* - Non-blocking async operations
*
* @return RecoveryResult containing:
* - missedCount: Number of missed notifications marked
* - rescheduledCount: Number of notifications rescheduled
* - verifiedCount: Number of notifications verified as scheduled
* - errors: Number of errors encountered during recovery
*
* @throws Never throws - all errors are caught and counted in result
*
* @see detectMissedNotifications() for missed notification detection
* @see verifyFutureNotifications() for future notification verification
* @see RecoveryResult for result structure
*/
private func performColdStartRecovery() async throws -> RecoveryResult {
let currentTime = Date()
@@ -328,10 +412,24 @@ class DailyNotificationReactivationManager {
/**
* Detect missed notifications
*
* @param currentTime Current time for comparison
* @return Array of missed notifications
* Identifies notifications that were scheduled to fire but haven't been delivered.
* A notification is considered "missed" if:
* - scheduledTime < currentTime (notification time has passed)
* - deliveryStatus != 'delivered' (not yet marked as delivered)
*
* Note: Internal for testing
* Error Handling:
* - Storage errors: Returns empty array (non-fatal)
* - All errors logged but don't crash app
*
* @param currentTime Current time for comparison (typically Date())
* @return Array of NotificationContent that are considered missed
*
* @throws Never throws - all errors are caught and handled internally
*
* @note Internal visibility for unit testing. External code should use
* performRecovery() which calls this method internally.
*
* @see NotificationContent for notification structure
*/
internal func detectMissedNotifications(currentTime: Date) async throws -> [NotificationContent] {
// Get all notifications from storage
@@ -388,9 +486,32 @@ class DailyNotificationReactivationManager {
/**
* Verify future notifications are scheduled
*
* @return VerificationResult with comparison details
* Compares notifications in storage (scheduled for future) with pending
* notifications in UNUserNotificationCenter to identify any missing ones.
*
* Note: Internal for testing
* Verification Process:
* 1. Get all pending notifications from UNUserNotificationCenter
* 2. Get all future notifications from storage (scheduledTime >= now)
* 3. Compare IDs to find missing notifications
* 4. Return verification result with counts and missing IDs
*
* Error Handling:
* - Notification center errors: Returns partial result (assumes all missing)
* - Storage errors: Returns partial result (assumes none found)
* - All errors logged but don't crash app
*
* @return VerificationResult containing:
* - totalSchedules: Total future notifications in storage
* - notificationsFound: Number found in UNUserNotificationCenter
* - notificationsMissing: Number missing from UNUserNotificationCenter
* - missingIds: Array of notification IDs that need rescheduling
*
* @throws Never throws - all errors are caught and handled internally
*
* @note Internal visibility for unit testing. External code should use
* performRecovery() which calls this method internally.
*
* @see VerificationResult for result structure
*/
internal func verifyFutureNotifications() async throws -> VerificationResult {
// Get pending notifications from UNUserNotificationCenter
@@ -453,7 +574,22 @@ class DailyNotificationReactivationManager {
/**
* Reschedule missing notification
*
* Retrieves notification content from storage and reschedules it using
* the scheduler. This is called when verifyFutureNotifications() identifies
* a notification that should be scheduled but isn't in UNUserNotificationCenter.
*
* Error Handling:
* - Storage errors: Throws ReactivationError.notificationNotFound
* - Scheduling errors: Throws ReactivationError.rescheduleFailed
* - Errors are caught by caller and counted in RecoveryResult.errors
*
* @param id Notification ID to reschedule
*
* @throws ReactivationError.notificationNotFound if notification not found in storage
* @throws ReactivationError.rescheduleFailed if scheduling fails
*
* @see verifyFutureNotifications() for identification of missing notifications
* @see DailyNotificationScheduler.scheduleNotification() for scheduling logic
*/
private func rescheduleMissingNotification(id: String) async throws {
// Get notification content from storage
@@ -733,12 +869,32 @@ class DailyNotificationReactivationManager {
// MARK: - History Recording
/**
* Record recovery history
* Record recovery history in Core Data
*
* @param result Recovery result
* @param scenario Recovery scenario
* @param startTime When recovery started
* @param endTime When recovery ended
* Persists recovery metrics to Core Data History entity for observability
* and debugging. Records execution time, counts, and scenario information.
*
* History Record Contains:
* - Scenario type (cold start, termination, boot)
* - Missed notification count
* - Rescheduled notification count
* - Verified notification count
* - Error count
* - Execution duration (milliseconds)
*
* Error Handling:
* - Core Data errors are logged but don't fail recovery
* - Best effort: if history recording fails, recovery still succeeds
*
* @param result Recovery result with metrics
* @param scenario Recovery scenario that was executed
* @param startTime When recovery started (for duration calculation)
* @param endTime When recovery ended (for duration calculation)
*
* @throws Never throws - all errors are caught and logged internally
*
* @see HistoryDAO.recordRecovery() for Core Data persistence
* @see RecoveryResult for result structure
*/
private func recordRecoveryHistory(_ result: RecoveryResult, scenario: RecoveryScenario, startTime: Date, endTime: Date) async throws {
// Log recovery metrics
@@ -776,10 +932,28 @@ class DailyNotificationReactivationManager {
}
/**
* Record recovery failure
* Record recovery failure in Core Data
*
* @param error Error that occurred
* @param scenario Optional recovery scenario (if known)
* Persists error information to Core Data History entity when recovery
* fails. Records error details, type, and optional scenario information.
*
* Error Record Contains:
* - Error message (localizedDescription)
* - Error type (Swift type name)
* - NSError domain and code (if applicable)
* - NSError userInfo (if applicable)
* - Scenario (if known)
*
* Error Handling:
* - Core Data errors are logged but don't fail recovery
* - Best effort: if history recording fails, error is still logged
*
* @param error Error that occurred during recovery
* @param scenario Optional recovery scenario (if known before failure)
*
* @throws Never throws - all errors are caught and logged internally
*
* @see HistoryDAO.recordRecoveryFailure() for Core Data persistence
*/
private func recordRecoveryFailure(_ error: Error, scenario: String? = nil) async throws {
// Enhanced error logging