MacOS Swift 应用程序中不正确的 VPN 数据统计信息

问：

我正在尝试在使用 TunnelKit 创建与 VPN 的 WireGuard 连接的 MacOS Swift 应用程序中获取 Rx（接收的数据包字节数）和 Tx（传输的数据包字节数）。

我已经确认我已连接到我的 VPN 并正在获取数据。 但是，我根本没有取回 Rx 和 Tx 值 - 这是我的代码;我正在使用 SystemConfiguration 框架尝试获取连接的 VPN 的数据。

这是我尝试通过框架获取VPN统计数据的地方SystemConfiguration

#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>

NS_ASSUME_NONNULL_BEGIN

@interface VPNConnectionStatisticsManager : NSObject

- (SCNetworkConnectionRef _Nullable)initializeVPNConnectionWithServiceID:(NSString *)serviceID;

@end

NS_ASSUME_NONNULL_END


#import <Foundation/Foundation.h>
#import "VPNConnectionStatisticsManager.h"

@implementation VPNConnectionStatisticsManager

- (SCNetworkConnectionRef _Nullable)initializeVPNConnectionWithServiceID:(NSString *)serviceID {
    SCNetworkConnectionContext context = {0, NULL, NULL, NULL, NULL};
    SCNetworkConnectionRef connection = SCNetworkConnectionCreateWithServiceID(NULL, (__bridge CFStringRef)serviceID, ConnectionStatusChanged, &context);
    return connection;
}


static void ConnectionStatusChanged(SCNetworkConnectionRef connection, SCNetworkConnectionStatus status, void *info) {
    NSLog(@"VPN status changed: %d", (int)status);
}

@end

我更改了我的代码，以确保不会在每次调用时重新创建它。还包括我的视图代码，该代码在上下文中显示了这一点：VPNConnectionStatisticsManager

class VPNStatusViewModel: ObservableObject {
    var vpnStatusRefreshTimer: Timer?
    var vpnConnection: SCNetworkConnection?
    private let vpnConnectionStatisticsManager = VPNConnectionStatisticsManager()

    func initializeVPNConnection() {
        if let serviceID = findMeterVPNServiceID(),
           let vpnConnectionRef = vpnConnectionStatisticsManager.initializeVPNConnection(withServiceID: serviceID) {
            vpnConnection = vpnConnectionRef.takeRetainedValue()
        }
    }

    func getVPNData() -> (rx: String, tx: String) {
        var rx: String = "N/A"
        var tx: String = "N/A"
        
        if let vpnConnection = vpnConnection,
           let statsDict = SCNetworkConnectionCopyStatistics(vpnConnection) as? [String: Any],
           let vpnDict = statsDict["VPN"] as? [String: Any] {
            if let rxInt = vpnDict["BytesIn"] as? Int, let txInt = vpnDict["BytesOut"] as? Int {
                let formatter = ByteCountFormatter()
                formatter.allowedUnits = [.useBytes, .useKB, .useMB]
                rx = formatter.string(fromByteCount: Int64(rxInt))
                tx = formatter.string(fromByteCount: Int64(txInt))
            }
        }
        
        return (rx, tx)
    }

    func stopVPNStatusTimer() {
        vpnStatusRefreshTimer?.invalidate()
        vpnStatusRefreshTimer = nil
    }

    func releaseVPNConnection() {
        vpnConnection = nil
    }
}

struct VPNStatusPane: View {
    @ObservedObject var appDelegate: AppDelegate
    @StateObject private var viewModel = VPNStatusViewModel()
    @State var connectedSince: String
    @State var rxBytes: String = "0"
    @State var txBytes: String = "0"

    init(appDelegate: AppDelegate) {
        self.appDelegate = appDelegate
        self._connectedSince = State(initialValue: appDelegate.vpnConnectedSince)
    }

    var body: some View {
        VStack(alignment: .leading) {
            VStack(alignment: .leading, spacing: 10) {
                HypeneatedText(label: "Rx bytes", value: rxBytes)
                HypeneatedText(label: "Tx bytes", value: txBytes)
                HypeneatedText(label: "Connected for", value: connectedSince)
            }
            .padding(.top, 15)

            Spacer()
        }
        .onAppear {
            viewModel.initializeVPNConnection()
            updateVPNData()
            startVPNStatusTimer()
        }
        .onDisappear {
            viewModel.stopVPNStatusTimer()
            viewModel.releaseVPNConnection()
        }
        .frame(maxWidth: .infinity, alignment: .topLeading)
    }

    private func startVPNStatusTimer() {
        viewModel.vpnStatusRefreshTimer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [self] _ in
            if self.appDelegate.vpnIsConnected {
                self.appDelegate.updateConnectionTime()
            }
            self.connectedSince = self.appDelegate.vpnConnectedSince
            self.updateVPNData()
        }
    }

    private func updateVPNData() {
        let vpnData = viewModel.getVPNData()
        rxBytes = vpnData.rx
        txBytes = vpnData.tx
    }
}