yattee/Model/Cache/FeedCacheModel.swift

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