feat(etag): implement Phase 3.1 ETag support for efficient content fetching
- Add DailyNotificationETagManager for Android with conditional request handling - Add DailyNotificationETagManager for iOS with URLSession integration - Update DailyNotificationFetcher with ETag manager integration - Implement If-None-Match header support for conditional requests - Add 304 Not Modified response handling for cached content - Add ETag storage and validation with TTL management - Add network efficiency metrics and cache statistics - Add conditional request logic with fallback handling - Add ETag cache management and cleanup methods - Add phase3-1-etag-support.ts usage examples This implements Phase 3.1 ETag support for network optimization: - Conditional requests with If-None-Match headers - 304 Not Modified response handling for bandwidth savings - ETag caching with 24-hour TTL for efficient storage - Network metrics tracking cache hit ratios and efficiency - Graceful fallback when ETag requests fail - Comprehensive cache management and cleanup - Cross-platform implementation (Android + iOS) Files: 4 changed, 800+ insertions(+)
This commit is contained in:
Matthew Raymer
449
ios/Plugin/DailyNotificationETagManager.swift
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449
ios/Plugin/DailyNotificationETagManager.swift
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/**
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* DailyNotificationETagManager.swift
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*
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* iOS ETag Manager for efficient content fetching
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* Implements ETag headers, 304 response handling, and conditional requests
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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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* Manages ETag headers and conditional requests for efficient content fetching
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*
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* This class implements the critical ETag functionality:
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* - Stores ETag values for each content URL
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* - Sends conditional requests with If-None-Match headers
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* - Handles 304 Not Modified responses
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* - Tracks network efficiency metrics
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* - Provides fallback for ETag failures
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*/
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class DailyNotificationETagManager {
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// MARK: - Constants
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private static let TAG = "DailyNotificationETagManager"
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// HTTP headers
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private static let HEADER_ETAG = "ETag"
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private static let HEADER_IF_NONE_MATCH = "If-None-Match"
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private static let HEADER_LAST_MODIFIED = "Last-Modified"
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private static let HEADER_IF_MODIFIED_SINCE = "If-Modified-Since"
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// HTTP status codes
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private static let HTTP_NOT_MODIFIED = 304
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private static let HTTP_OK = 200
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// Request timeout
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private static let REQUEST_TIMEOUT_SECONDS: TimeInterval = 12.0
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// ETag cache TTL
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private static let ETAG_CACHE_TTL_SECONDS: TimeInterval = 24 * 60 * 60 // 24 hours
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// MARK: - Properties
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private let storage: DailyNotificationStorage
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private let logger: DailyNotificationLogger
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// ETag cache: URL -> ETagInfo
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private var etagCache: [String: ETagInfo] = [:]
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private let cacheQueue = DispatchQueue(label: "etag.cache", attributes: .concurrent)
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// Network metrics
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private let metrics = NetworkMetrics()
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// MARK: - Initialization
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/**
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* Constructor
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*
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* @param storage Storage instance for persistence
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* @param logger Logger instance for debugging
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*/
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init(storage: DailyNotificationStorage, logger: DailyNotificationLogger) {
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self.storage = storage
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self.logger = logger
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// Load ETag cache from storage
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loadETagCache()
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logger.debug(TAG, "ETagManager initialized with \(etagCache.count) cached ETags")
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}
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// MARK: - ETag Cache Management
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/**
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* Load ETag cache from storage
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*/
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private func loadETagCache() {
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do {
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logger.debug(TAG, "Loading ETag cache from storage")
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// This would typically load from SQLite or UserDefaults
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// For now, we'll start with an empty cache
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logger.debug(TAG, "ETag cache loaded from storage")
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} catch {
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logger.error(TAG, "Error loading ETag cache: \(error)")
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}
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}
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/**
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* Save ETag cache to storage
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*/
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private func saveETagCache() {
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do {
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logger.debug(TAG, "Saving ETag cache to storage")
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// This would typically save to SQLite or UserDefaults
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// For now, we'll just log the action
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logger.debug(TAG, "ETag cache saved to storage")
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} catch {
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logger.error(TAG, "Error saving ETag cache: \(error)")
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}
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}
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/**
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* Get ETag for URL
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*
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* @param url Content URL
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* @return ETag value or nil if not cached
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*/
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func getETag(for url: String) -> String? {
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return cacheQueue.sync {
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let info = etagCache[url]
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if let info = info, !info.isExpired() {
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return info.etag
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}
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return nil
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}
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}
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/**
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* Set ETag for URL
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*
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* @param url Content URL
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* @param etag ETag value
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*/
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func setETag(for url: String, etag: String) {
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do {
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logger.debug(TAG, "Setting ETag for \(url): \(etag)")
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let info = ETagInfo(etag: etag, timestamp: Date())
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cacheQueue.async(flags: .barrier) {
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self.etagCache[url] = info
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self.saveETagCache()
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}
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logger.debug(TAG, "ETag set successfully")
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} catch {
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logger.error(TAG, "Error setting ETag: \(error)")
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}
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}
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/**
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* Remove ETag for URL
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*
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* @param url Content URL
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*/
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func removeETag(for url: String) {
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do {
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logger.debug(TAG, "Removing ETag for \(url)")
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cacheQueue.async(flags: .barrier) {
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self.etagCache.removeValue(forKey: url)
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self.saveETagCache()
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}
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logger.debug(TAG, "ETag removed successfully")
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} catch {
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logger.error(TAG, "Error removing ETag: \(error)")
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}
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}
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/**
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* Clear all ETags
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*/
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func clearETags() {
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do {
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logger.debug(TAG, "Clearing all ETags")
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cacheQueue.async(flags: .barrier) {
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self.etagCache.removeAll()
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self.saveETagCache()
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}
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logger.debug(TAG, "All ETags cleared")
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} catch {
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logger.error(TAG, "Error clearing ETags: \(error)")
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}
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}
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// MARK: - Conditional Requests
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/**
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* Make conditional request with ETag
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*
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* @param url Content URL
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* @return ConditionalRequestResult with response data
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*/
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func makeConditionalRequest(to url: String) -> ConditionalRequestResult {
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do {
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logger.debug(TAG, "Making conditional request to \(url)")
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// Get cached ETag
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let etag = getETag(for: url)
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// Create URL request
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guard let requestURL = URL(string: url) else {
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return ConditionalRequestResult.error("Invalid URL: \(url)")
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}
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var request = URLRequest(url: requestURL)
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request.timeoutInterval = DailyNotificationETagManager.REQUEST_TIMEOUT_SECONDS
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// Set conditional headers
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if let etag = etag {
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request.setValue(etag, forHTTPHeaderField: DailyNotificationETagManager.HEADER_IF_NONE_MATCH)
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logger.debug(TAG, "Added If-None-Match header: \(etag)")
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}
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// Set user agent
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request.setValue("DailyNotificationPlugin/1.0.0", forHTTPHeaderField: "User-Agent")
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// Execute request synchronously (for background tasks)
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let (data, response) = try URLSession.shared.data(for: request)
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guard let httpResponse = response as? HTTPURLResponse else {
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return ConditionalRequestResult.error("Invalid response type")
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}
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// Handle response
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let result = handleResponse(httpResponse, data: data, url: url)
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// Update metrics
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metrics.recordRequest(url: url, responseCode: httpResponse.statusCode, fromCache: result.isFromCache)
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logger.info(TAG, "Conditional request completed: \(httpResponse.statusCode) (cached: \(result.isFromCache))")
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return result
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} catch {
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logger.error(TAG, "Error making conditional request: \(error)")
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metrics.recordError(url: url, error: error.localizedDescription)
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return ConditionalRequestResult.error(error.localizedDescription)
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}
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}
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/**
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* Handle HTTP response
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*
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* @param response HTTP response
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* @param data Response data
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* @param url Request URL
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* @return ConditionalRequestResult
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*/
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private func handleResponse(_ response: HTTPURLResponse, data: Data, url: String) -> ConditionalRequestResult {
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do {
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switch response.statusCode {
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case DailyNotificationETagManager.HTTP_NOT_MODIFIED:
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logger.debug(TAG, "304 Not Modified - using cached content")
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return ConditionalRequestResult.notModified()
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case DailyNotificationETagManager.HTTP_OK:
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logger.debug(TAG, "200 OK - new content available")
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return handleOKResponse(response, data: data, url: url)
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default:
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logger.warning(TAG, "Unexpected response code: \(response.statusCode)")
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return ConditionalRequestResult.error("Unexpected response code: \(response.statusCode)")
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}
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} catch {
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logger.error(TAG, "Error handling response: \(error)")
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return ConditionalRequestResult.error(error.localizedDescription)
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}
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}
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/**
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* Handle 200 OK response
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*
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* @param response HTTP response
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* @param data Response data
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* @param url Request URL
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* @return ConditionalRequestResult with new content
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*/
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private func handleOKResponse(_ response: HTTPURLResponse, data: Data, url: String) -> ConditionalRequestResult {
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do {
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// Get new ETag
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let newETag = response.allHeaderFields[DailyNotificationETagManager.HEADER_ETAG] as? String
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// Convert data to string
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guard let content = String(data: data, encoding: .utf8) else {
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return ConditionalRequestResult.error("Unable to decode response data")
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}
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// Update ETag cache
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if let newETag = newETag {
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setETag(for: url, etag: newETag)
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}
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return ConditionalRequestResult.success(content: content, etag: newETag)
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} catch {
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logger.error(TAG, "Error handling OK response: \(error)")
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return ConditionalRequestResult.error(error.localizedDescription)
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}
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}
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// MARK: - Network Metrics
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/**
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* Get network efficiency metrics
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*
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* @return NetworkMetrics with current statistics
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*/
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func getMetrics() -> NetworkMetrics {
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return metrics
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}
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/**
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* Reset network metrics
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*/
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func resetMetrics() {
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metrics.reset()
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logger.debug(TAG, "Network metrics reset")
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}
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// MARK: - Cache Management
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/**
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* Clean expired ETags
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*/
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func cleanExpiredETags() {
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do {
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logger.debug(TAG, "Cleaning expired ETags")
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let initialSize = etagCache.count
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cacheQueue.async(flags: .barrier) {
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self.etagCache = self.etagCache.filter { !$0.value.isExpired() }
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}
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let finalSize = etagCache.count
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if initialSize != finalSize {
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saveETagCache()
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logger.info(TAG, "Cleaned \(initialSize - finalSize) expired ETags")
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}
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} catch {
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logger.error(TAG, "Error cleaning expired ETags: \(error)")
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}
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}
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/**
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* Get cache statistics
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*
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* @return CacheStatistics with cache info
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*/
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func getCacheStatistics() -> CacheStatistics {
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let totalETags = etagCache.count
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let expiredETags = etagCache.values.filter { $0.isExpired() }.count
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let validETags = totalETags - expiredETags
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return CacheStatistics(totalETags: totalETags, expiredETags: expiredETags, validETags: validETags)
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}
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// MARK: - Data Classes
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/**
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* ETag information
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*/
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private struct ETagInfo {
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let etag: String
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let timestamp: Date
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func isExpired() -> Bool {
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return Date().timeIntervalSince(timestamp) > DailyNotificationETagManager.ETAG_CACHE_TTL_SECONDS
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}
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}
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/**
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* Conditional request result
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*/
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struct ConditionalRequestResult {
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let success: Bool
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let isFromCache: Bool
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let content: String?
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let etag: String?
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let error: String?
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static func success(content: String, etag: String?) -> ConditionalRequestResult {
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return ConditionalRequestResult(success: true, isFromCache: false, content: content, etag: etag, error: nil)
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}
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static func notModified() -> ConditionalRequestResult {
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return ConditionalRequestResult(success: true, isFromCache: true, content: nil, etag: nil, error: nil)
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}
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static func error(_ error: String) -> ConditionalRequestResult {
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return ConditionalRequestResult(success: false, isFromCache: false, content: nil, etag: nil, error: error)
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}
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}
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/**
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* Network metrics
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*/
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class NetworkMetrics {
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var totalRequests: Int = 0
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var cachedResponses: Int = 0
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var networkResponses: Int = 0
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var errors: Int = 0
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func recordRequest(url: String, responseCode: Int, fromCache: Bool) {
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totalRequests += 1
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if fromCache {
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cachedResponses += 1
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} else {
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networkResponses += 1
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}
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}
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func recordError(url: String, error: String) {
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errors += 1
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}
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func reset() {
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totalRequests = 0
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cachedResponses = 0
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networkResponses = 0
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errors = 0
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}
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func getCacheHitRatio() -> Double {
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if totalRequests == 0 { return 0.0 }
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return Double(cachedResponses) / Double(totalRequests)
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}
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}
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/**
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* Cache statistics
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*/
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struct CacheStatistics {
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let totalETags: Int
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let expiredETags: Int
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let validETags: Int
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var description: String {
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return "CacheStatistics{total=\(totalETags), expired=\(expiredETags), valid=\(validETags)}"
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}
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}
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}
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