damus

nostr ios client
git clone git://jb55.com/damus
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DamusCacheManager.swift (2157B)

      1 //
      2 //  DamusCacheManager.swift
      3 //  damus
      4 //
      5 //  Created by Daniel D’Aquino on 2023-10-04.
      6 //
      7 
      8 import Foundation
      9 import Kingfisher
     10 
     11 struct DamusCacheManager {
     12     static var shared: DamusCacheManager = DamusCacheManager()
     13     
     14     func clear_cache(damus_state: DamusState, completion: (() -> Void)? = nil) {
     15         Log.info("Clearing all caches", for: .storage)
     16         clear_kingfisher_cache(completion: {
     17             clear_cache_folder(completion: {
     18                 Log.info("All caches cleared", for: .storage)
     19                 completion?()
     20             })
     21         })
     22     }
     23     
     24     func clear_kingfisher_cache(completion: (() -> Void)? = nil) {
     25         Log.info("Clearing Kingfisher cache", for: .storage)
     26         KingfisherManager.shared.cache.clearMemoryCache()
     27         KingfisherManager.shared.cache.clearDiskCache {
     28             Log.info("Kingfisher cache cleared", for: .storage)
     29             completion?()
     30         }
     31     }
     32     
     33     func clear_cache_folder(completion: (() -> Void)? = nil) {
     34         Log.info("Clearing entire cache folder", for: .storage)
     35         let cacheURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
     36         
     37         do {
     38             let fileNames = try FileManager.default.contentsOfDirectory(atPath: cacheURL.path)
     39             
     40             for fileName in fileNames {
     41                 let filePath = cacheURL.appendingPathComponent(fileName)
     42                 
     43                 // Prevent issues by double-checking if files are in use, and do not delete them if they are.
     44                 // This is not perfect. There is still a small chance for a race condition if a file is opened between this check and the file removal.
     45                 let isBusy = (!(access(filePath.path, F_OK) == -1 && errno == ETXTBSY))
     46                 if isBusy {
     47                     continue
     48                 }
     49                 
     50                 try FileManager.default.removeItem(at: filePath)
     51             }
     52             
     53             Log.info("Cache folder cleared successfully.", for: .storage)
     54             completion?()
     55         } catch {
     56             Log.error("Could not clear cache folder", for: .storage)
     57         }
     58     }
     59 }