passepartout-apple/PassepartoutLibrary/Sources/PassepartoutUtils/Reusable/RateLimited.swift

57 lines
1.9 KiB
Swift

//
// RateLimited.swift
// Passepartout
//
// Created by Davide De Rosa on 4/6/22.
// Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
// https://github.com/passepartoutvpn
//
// This file is part of Passepartout.
//
// Passepartout is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Passepartout is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Passepartout. If not, see <http://www.gnu.org/licenses/>.
//
import Foundation
public protocol RateLimited: AnyObject {
associatedtype ActionID: Hashable
var lastActionDate: [ActionID: Date] { get set }
var rateLimitMilliseconds: Int? { get }
}
extension RateLimited {
public func saveLastAction(_ id: ActionID) {
lastActionDate[id] = Date()
}
public func isRateLimited(_ id: ActionID) -> Bool {
guard let lastActionDate = lastActionDate[id] else {
return false
}
pp_log.debug("Last action date: \(lastActionDate)")
if let rateLimitMilliseconds = rateLimitMilliseconds {
let elapsedNanoseconds = UInt64(-lastActionDate.timeIntervalSinceNow) * NSEC_PER_SEC
let rateLimitNanoseconds = UInt64(rateLimitMilliseconds) * NSEC_PER_MSEC
guard elapsedNanoseconds >= rateLimitNanoseconds else {
pp_log.warning("Rate limited, only \(elapsedNanoseconds) nsec elapsed (< \(rateLimitNanoseconds))")
return true
}
}
return false
}
}