import Cache import Defaults import Foundation import Logging import SwiftyJSON struct FeedCacheModel: CacheModel { static let shared = FeedCacheModel() let logger = Logger(label: "stream.yattee.cache.feed") static let diskConfig = DiskConfig(name: "feed") static let memoryConfig = MemoryConfig() let storage = try? Storage( diskConfig: Self.diskConfig, memoryConfig: Self.memoryConfig, transformer: BaseCacheModel.jsonTransformer ) func storeFeed(account: Account, videos: [Video]) { let date = iso8601DateFormatter.string(from: Date()) logger.info("caching feed \(account.feedCacheKey) -- \(date)") let feedTimeObject: JSON = ["date": date] let videosObject: JSON = ["videos": videos.prefix(cacheLimit).map { $0.json.object }] try? storage?.setObject(feedTimeObject, forKey: feedTimeCacheKey(account.feedCacheKey)) try? storage?.setObject(videosObject, forKey: account.feedCacheKey) } func retrieveFeed(account: Account) -> [Video] { logger.info("retrieving cache for \(account.feedCacheKey)") if let json = try? storage?.object(forKey: account.feedCacheKey), let videos = json.dictionaryValue["videos"] { return videos.arrayValue.map { Video.from($0) } } return [] } func getFeedTime(account: Account) -> Date? { if let json = try? storage?.object(forKey: feedTimeCacheKey(account.feedCacheKey)), let string = json.dictionaryValue["date"]?.string, let date = iso8601DateFormatter.date(from: string) { return date } return nil } private var cacheLimit: Int { let setting = Int(Defaults[.feedCacheSize]) ?? 0 if setting > 0 { return setting } return 50 } private func feedTimeCacheKey(_ feedCacheKey: String) -> String { "\(feedCacheKey)-feedTime" } }