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/*
 * Copyright 2019 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.address;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandler;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;

import java.net.NetworkInterface;
import java.net.SocketAddress;

/**
 * {@link ChannelOutboundHandler} implementation which allows to dynamically replace the used
 * {@code remoteAddress} and / or {@code localAddress} when making a connection attempt.
 * 

* This can be useful to for example bind to a specific {@link NetworkInterface} based on * the {@code remoteAddress}. */ public abstract class DynamicAddressConnectHandler extends ChannelOutboundHandlerAdapter { @Override public final void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) { final SocketAddress remote; final SocketAddress local; try { remote = remoteAddress(remoteAddress, localAddress); local = localAddress(remoteAddress, localAddress); } catch (Exception e) { promise.setFailure(e); return; } ctx.connect(remote, local, promise).addListener(new ChannelFutureListener() { @Override public void operationComplete(ChannelFuture future) { if (future.isSuccess()) { // We only remove this handler from the pipeline once the connect was successful as otherwise // the user may try to connect again. future.channel().pipeline().remove(DynamicAddressConnectHandler.this); } } }); } /** * Returns the local {@link SocketAddress} to use for * {@link ChannelHandlerContext#connect(SocketAddress, SocketAddress)} based on the original {@code remoteAddress} * and {@code localAddress}. * By default, this method returns the given {@code localAddress}. */ protected SocketAddress localAddress( @SuppressWarnings("unused") SocketAddress remoteAddress, SocketAddress localAddress) throws Exception { return localAddress; } /** * Returns the remote {@link SocketAddress} to use for * {@link ChannelHandlerContext#connect(SocketAddress, SocketAddress)} based on the original {@code remoteAddress} * and {@code localAddress}. * By default, this method returns the given {@code remoteAddress}. */ protected SocketAddress remoteAddress( SocketAddress remoteAddress, @SuppressWarnings("unused") SocketAddress localAddress) throws Exception { return remoteAddress; } }





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