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//
// AnyTransport.swift
// MullvadRESTTests
//
// Created by pronebird on 25/08/2023.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
@preconcurrency import Foundation
import MullvadTypes
@testable import MullvadREST
/// Mock implementation of REST transport that can be used to handle requests without doing any actual networking.
class AnyTransport: RESTTransport, @unchecked Sendable {
typealias CompletionHandler = (Data?, URLResponse?, Error?) -> Void
private let handleRequest: () -> AnyResponse
private let completionLock = NSLock()
private var completionHandlers: [UUID: CompletionHandler] = [:]
init(block: @escaping @Sendable () -> AnyResponse) {
handleRequest = block
}
var name: String {
return "any-transport"
}
func sendRequest(
_ request: URLRequest,
completion: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void
) -> Cancellable {
let response = handleRequest()
let id = storeCompletion(completionHandler: completion)
let dispatchWork = DispatchWorkItem {
let data = (try? response.encode()) ?? Data()
let httpResponse = HTTPURLResponse(
url: request.url!,
statusCode: response.statusCode,
httpVersion: "1.0",
headerFields: [:]
)!
self.sendCompletion(requestID: id, completion: .success((data, httpResponse)))
}
DispatchQueue.global().asyncAfter(deadline: .now() + response.delay, execute: dispatchWork)
return AnyCancellable {
dispatchWork.cancel()
self.sendCompletion(requestID: id, completion: .failure(URLError(.cancelled)))
}
}
private func storeCompletion(completionHandler: @escaping CompletionHandler) -> UUID {
return completionLock.withLock {
let id = UUID()
completionHandlers[id] = completionHandler
return id
}
}
private func sendCompletion(requestID: UUID, completion: Result<(Data, URLResponse), Error>) {
let complationHandler = completionLock.withLock {
return completionHandlers.removeValue(forKey: requestID)
}
switch completion {
case let .success((data, response)):
complationHandler?(data, response, nil)
case let .failure(error):
complationHandler?(nil, nil, error)
}
}
}
struct Response<T: Encodable>: AnyResponse {
var delay: TimeInterval
var statusCode: Int
var value: T
func encode() throws -> Data {
return try REST.Coding.makeJSONEncoder().encode(value)
}
}
protocol AnyResponse {
var delay: TimeInterval { get }
var statusCode: Int { get }
func encode() throws -> Data
}
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