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//
// TCPConnection.swift
// MullvadRustRuntimeTests
//
// Created by pronebird on 27/06/2023.
// Copyright © 2023 Mullvad VPN AB. All rights reserved.
//
import Foundation
import Network
/// Minimal implementation of TCP connection capable of receiving data.
/// > Warning: Do not use this implementation in production code. See the warning in `start()`.
class TCPConnection: Connection {
private let dispatchQueue = DispatchQueue(label: "TCPConnection")
private let nwConnection: NWConnection
required init(nwConnection: NWConnection) {
self.nwConnection = nwConnection
}
static var connectionParameters: NWParameters { .tcp }
deinit {
cancel()
}
/// Establishes the TCP connection.
///
/// > Warning: This implementation is **not safe to use in production**
/// It will cancel the `listener.stateUpdateHandler` after it becomes ready and ignore future updates.
///
/// Waits for the underlying connection to become ready before returning control to the caller, otherwise throws an
/// error if connection state indicates as such.
func start() async throws {
try await withCheckedThrowingContinuation { continuation in
nwConnection.stateUpdateHandler = { state in
switch state {
case .ready:
continuation.resume(returning: ())
case let .failed(error):
continuation.resume(throwing: error)
case .cancelled:
continuation.resume(throwing: CancellationError())
default:
return
}
// Reset state update handler after resuming continuation.
self.nwConnection.stateUpdateHandler = nil
}
nwConnection.start(queue: dispatchQueue)
}
}
func cancel() {
nwConnection.cancel()
}
func receiveData(minimumLength: Int, maximumLength: Int) async throws -> Data {
return try await withCheckedThrowingContinuation { continuation in
nwConnection.receive(
minimumIncompleteLength: minimumLength,
maximumLength: maximumLength
) { content, _, isComplete, error in
if let error {
continuation.resume(throwing: error)
} else if let content {
continuation.resume(returning: content)
} else if isComplete {
continuation.resume(returning: Data())
}
}
}
}
}
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