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Protect DiskCache.fileStates with a lock 

Closes #194
This commit is contained in:
Shadowfacts 2022-10-27 23:06:50 -04:00
parent d224f47b8c
commit ba209fa4d2
2 changed files with 15 additions and 9 deletions
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6
Tusker/Caching/DiskCache.swift
View File

@ -21,7 +21,7 @@ class DiskCache<T> {
let defaultExpiry: CacheExpiry
let transformer: DiskCacheTransformer<T>
private var fileStates = [String: FileState]()
private var fileStates = MultiThreadDictionary<String, FileState>()
init(name: String, defaultExpiry: CacheExpiry, transformer: DiskCacheTransformer<T>, fileManager: FileManager = .default) throws {
self.defaultExpiry = defaultExpiry
@ -117,7 +117,9 @@ class DiskCache<T> {
func removeAll() throws {
try fileManager.removeItem(atPath: path)
try createDirectory()
fileStates.removeAll()
fileStates.withLock { dict in
dict.removeAll()
}
}
}

18
Tusker/MultiThreadDictionary.swift
View File

@ -16,13 +16,7 @@ class MultiThreadDictionary<Key: Hashable & Sendable, Value: Sendable> {
private let lock: LockHolder<[AnyHashable: Any]>
init() {
if #available(iOS 16.0, *) {
let lock = OSAllocatedUnfairLock(initialState: [:])
self.lock = LockHolder(withLock: lock.withLock(_:))
} else {
let lock = UnfairLock(initialState: [:])
self.lock = LockHolder(withLock: lock.withLock(_:))
}
self.lock = LockHolder(initialState: [:])
}
subscript(key: Key) -> Value? {
@ -66,6 +60,16 @@ class MultiThreadDictionary<Key: Hashable & Sendable, Value: Sendable> {
// see #178
fileprivate struct LockHolder<State> {
let withLock: (_ body: @Sendable (inout State) throws -> any Sendable) throws -> any Sendable
init(initialState: State) {
if #available(iOS 16.0, *) {
let lock = OSAllocatedUnfairLock(initialState: initialState)
self.withLock = lock.withLock(_:)
} else {
let lock = UnfairLock(initialState: initialState)
self.withLock = lock.withLock(_:)
}
}
}
// TODO: replace this only with OSAllocatedUnfairLock