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/*
* Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.backend;
import com.wireguard.config.Config;
import com.wireguard.util.NonNullForAll;
import java.util.Set;
import androidx.annotation.Nullable;
/**
* Interface for implementations of the WireGuard secure network tunnel.
*/
@NonNullForAll
public interface Backend {
/**
* Enumerate names of currently-running tunnels.
*
* @return The set of running tunnel names.
*/
Set<String> getRunningTunnelNames();
/**
* Get the state of a tunnel.
*
* @param tunnel The tunnel to examine the state of.
* @return The state of the tunnel.
* @throws Exception Exception raised when retrieving tunnel's state.
*/
Tunnel.State getState(Tunnel tunnel) throws Exception;
/**
* Get statistics about traffic and errors on this tunnel. If the tunnel is not running, the
* statistics object will be filled with zero values.
*
* @param tunnel The tunnel to retrieve statistics for.
* @return The statistics for the tunnel.
* @throws Exception Exception raised when retrieving statistics.
*/
Statistics getStatistics(Tunnel tunnel) throws Exception;
/**
* Determine version of underlying backend.
*
* @return The version of the backend.
* @throws Exception Exception raised while retrieving version.
*/
String getVersion() throws Exception;
/**
* Set the state of a tunnel, updating it's configuration. If the tunnel is already up, config
* may update the running configuration; config may be null when setting the tunnel down.
*
* @param tunnel The tunnel to control the state of.
* @param state The new state for this tunnel. Must be {@code UP}, {@code DOWN}, or
* {@code TOGGLE}.
* @param config The configuration for this tunnel, may be null if state is {@code DOWN}.
* @return The updated state of the tunnel.
* @throws Exception Exception raised while changing state.
*/
Tunnel.State setState(Tunnel tunnel, Tunnel.State state, @Nullable Config config) throws Exception;
}
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