passepartout-apple/PassepartoutLibrary/Sources/PassepartoutUtils/Utils/Utils+Async.swift

69 lines
2.2 KiB
Swift

//
// Utils+Async.swift
// Passepartout
//
// Created by Davide De Rosa on 2/25/22.
// 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
import Combine
// https://medium.com/geekculture/from-combine-to-async-await-c08bf1d15b77
enum AsyncPublisherError: Error {
case discarded
}
extension Publisher {
public func async() async throws -> Output {
try await withCheckedThrowingContinuation { continuation in
var cancellable: AnyCancellable?
var isResumed = false
cancellable = first()
.sink { result in
switch result {
case .finished:
if !isResumed {
continuation.resume(with: .failure(AsyncPublisherError.discarded))
}
case let .failure(error):
continuation.resume(throwing: error)
}
cancellable?.cancel()
} receiveValue: { value in
continuation.resume(with: .success(value))
isResumed = true
}
}
}
}
extension Task where Success == Never, Failure == Never {
public static func maybeWait(forMilliseconds msec: Int?) async {
guard let msec = msec else {
return
}
try? await sleep(nanoseconds: UInt64(msec) * NSEC_PER_MSEC)
}
}