46 lines
1.5 KiB
Swift
46 lines
1.5 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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import GRDB
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import Curve25519Kit
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public protocol GeneralCacheType {
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var encodedPublicKey: String? { get set }
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}
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public enum General {
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public class Cache: GeneralCacheType {
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public var encodedPublicKey: String? = nil
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}
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public static var cache: Atomic<GeneralCacheType> = Atomic(Cache())
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}
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public enum GeneralError: Error {
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case keyGenerationFailed
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}
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public func getUserHexEncodedPublicKey(_ db: Database? = nil, dependencies: Dependencies = Dependencies()) -> String {
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if let cachedKey: String = dependencies.generalCache.wrappedValue.encodedPublicKey { return cachedKey }
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if let publicKey: Data = Identity.fetchUserPublicKey(db) { // Can be nil under some circumstances
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let sessionId: SessionId = SessionId(.standard, publicKey: publicKey.bytes)
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dependencies.generalCache.mutate { $0.encodedPublicKey = sessionId.hexString }
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return sessionId.hexString
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}
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return ""
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}
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/// Does nothing, but is never inlined and thus evaluating its argument will never be optimized away.
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///
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/// Useful for forcing the instantiation of lazy properties like globals.
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@inline(never)
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public func touch<Value>(_ value: Value) { /* Do nothing */ }
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/// Returns `f(x!)` if `x != nil`, or `nil` otherwise.
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public func given<T, U>(_ x: T?, _ f: (T) throws -> U) rethrows -> U? { return try x.map(f) }
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public func with<T, U>(_ x: T, _ f: (T) throws -> U) rethrows -> U { return try f(x) }
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