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