// Path: Android/app/src/main/java/app/intra/net/go/GoProber.java
// public class GoProber extends Prober {
// 
//   private final Context context;
// 
//   public GoProber(Context context) {
//     this.context = context;
//   }
// 
//   @Override
//   public void probe(String url, Callback callback) {
//     new Thread(() -> {
//       String dohIPs = GoVpnAdapter.getIpString(context, url);
//       try {
//         // Protection isn't needed for Lollipop+, or if the VPN is not active.
//         Protector protector = VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP ? null :
//             VpnController.getInstance().getIntraVpnService();
//         Transport transport = Tun2socks.newDoHTransport(url, dohIPs, protector, null, null);
//         if (transport == null) {
//           callback.onCompleted(false);
//           return;
//         }
//         byte[] response = transport.query(QUERY_DATA);
//         if (response != null && response.length > 0) {
//           callback.onCompleted(true);
//           return;
//         }
//         callback.onCompleted(false);
//       } catch (Exception e) {
//         callback.onCompleted(false);
//       }
//     }).start();
//   }
// }


import android.content.Context;
import app.intra.net.go.GoProber;
/*
Copyright 2019 Jigsaw Operations LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package app.intra.net.doh;


/**
 * This class performs parallel probes to all of the specified servers and calls the listener when
 * the fastest probe succeeds or all probes have failed.  Each instance can only be used once.
 */
public class Race {

  public interface Listener {
    /**
     * This method is called once, when the race has concluded.
     * @param index The index in urls of the fastest server, or -1 if all probes failed.
     */
    void onResult(int index);
  }

  /**
   * Starts a race between different servers.
   * @param context Used to read the IP addresses of the servers from storage.
   * @param urls The URLs for all the DOH servers to compare.
   * @param listener Called once on an arbitrary thread with the result of the race.
   */
  public static void start(Context context, String[] urls, Listener listener) {
// Path: Android/app/src/main/java/app/intra/net/go/GoProber.java
// public class GoProber extends Prober {
// 
//   private final Context context;
// 
//   public GoProber(Context context) {
//     this.context = context;
//   }
// 
//   @Override
//   public void probe(String url, Callback callback) {
//     new Thread(() -> {
//       String dohIPs = GoVpnAdapter.getIpString(context, url);
//       try {
//         // Protection isn't needed for Lollipop+, or if the VPN is not active.
//         Protector protector = VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP ? null :
//             VpnController.getInstance().getIntraVpnService();
//         Transport transport = Tun2socks.newDoHTransport(url, dohIPs, protector, null, null);
//         if (transport == null) {
//           callback.onCompleted(false);
//           return;
//         }
//         byte[] response = transport.query(QUERY_DATA);
//         if (response != null && response.length > 0) {
//           callback.onCompleted(true);
//           return;
//         }
//         callback.onCompleted(false);
//       } catch (Exception e) {
//         callback.onCompleted(false);
//       }
//     }).start();
//   }
// }


// Path: Android/app/src/main/java/app/intra/net/doh/Race.java
import android.content.Context;
import app.intra.net.go.GoProber;

/*
Copyright 2019 Jigsaw Operations LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package app.intra.net.doh;


/**
 * This class performs parallel probes to all of the specified servers and calls the listener when
 * the fastest probe succeeds or all probes have failed.  Each instance can only be used once.
 */
public class Race {

  public interface Listener {
    /**
     * This method is called once, when the race has concluded.
     * @param index The index in urls of the fastest server, or -1 if all probes failed.
     */
    void onResult(int index);
  }

  /**
   * Starts a race between different servers.
   * @param context Used to read the IP addresses of the servers from storage.
   * @param urls The URLs for all the DOH servers to compare.
   * @param listener Called once on an arbitrary thread with the result of the race.
   */
  public static void start(Context context, String[] urls, Listener listener) {
    Prober prober = new GoProber(context);