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05f166918f
This is a 'green' Flogger migration CL. Green CLs are intended to be as safe as possible and should be easy to review and submit. No changes should be necessary to the code itself prior to submission, but small changes to BUILD files may be required. Changes within files are completely independent of each other, so this CL can be safely split up for review using tools such as Rosie. For more information, see [] Base CL: 197331037 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=197466715
100 lines
3.8 KiB
Java
100 lines
3.8 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.proxy.handler;
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import static com.google.common.base.Preconditions.checkNotNull;
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import com.google.common.flogger.FluentLogger;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.util.Attribute;
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import io.netty.util.AttributeKey;
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import javax.inject.Inject;
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/**
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* Receives inbound massage of type {@code I}, and writes it to the {@code relayChannel} stored in
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* the inbound channel's attribute.
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*/
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public class RelayHandler<I> extends SimpleChannelInboundHandler<I> {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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/** Key used to retrieve the relay channel from a {@link Channel}'s {@link Attribute}. */
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public static final AttributeKey<Channel> RELAY_CHANNEL_KEY =
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AttributeKey.valueOf("RELAY_CHANNEL");
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public RelayHandler(Class<? extends I> clazz) {
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super(clazz, false);
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}
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/** Terminate connection when an exception is caught during inbound IO. */
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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logger.atSevere().withCause(cause).log(
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"Inbound exception caught for channel %s", ctx.channel());
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ChannelFuture unusedFuture = ctx.close();
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}
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/** Close relay channel if this channel is closed. */
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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Channel relayChannel = ctx.channel().attr(RELAY_CHANNEL_KEY).get();
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if (relayChannel != null) {
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ChannelFuture unusedFuture = relayChannel.close();
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}
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ctx.fireChannelInactive();
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}
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/** Read message of type {@code I}, write it as-is into the relay channel. */
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, I msg) throws Exception {
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Channel relayChannel = ctx.channel().attr(RELAY_CHANNEL_KEY).get();
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checkNotNull(relayChannel, "Relay channel not specified for channel: %s", ctx.channel());
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if (relayChannel.isActive()) {
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// Relay channel is open, write to it.
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ChannelFuture channelFuture = relayChannel.writeAndFlush(msg);
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channelFuture.addListener(
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future -> {
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// Cannot write into relay channel, close this channel.
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if (!future.isSuccess()) {
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ChannelFuture unusedFuture = ctx.close();
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}
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});
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} else {
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// close this channel if the relay channel is closed.
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ChannelFuture unusedFuture = ctx.close();
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}
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}
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/** Specialized {@link RelayHandler} that takes a {@link FullHttpRequest} as inbound payload. */
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public static class FullHttpRequestRelayHandler extends RelayHandler<FullHttpRequest> {
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@Inject
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public FullHttpRequestRelayHandler() {
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super(FullHttpRequest.class);
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}
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}
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/** Specialized {@link RelayHandler} that takes a {@link FullHttpResponse} as inbound payload. */
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public static class FullHttpResponseRelayHandler extends RelayHandler<FullHttpResponse> {
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@Inject
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public FullHttpResponseRelayHandler() {
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super(FullHttpResponse.class);
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}
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}
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}
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