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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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
*
* http://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 org.apache.dubbo.remoting.transport.netty4;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.remoting.api.connection.ConnectionHandler;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.EventLoop;
import io.netty.util.Attribute;
import io.netty.util.AttributeKey;
import java.util.concurrent.TimeUnit;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.TRANSPORT_UNEXPECTED_EXCEPTION;
@ChannelHandler.Sharable
public class NettyConnectionHandler extends ChannelInboundHandlerAdapter implements ConnectionHandler {
private static final ErrorTypeAwareLogger LOGGER = LoggerFactory.getErrorTypeAwareLogger(NettyConnectionHandler.class);
private static final AttributeKey GO_AWAY_KEY = AttributeKey.valueOf("dubbo_channel_goaway");
private final NettyConnectionClient connectionClient;
public NettyConnectionHandler(NettyConnectionClient connectionClient) {
this.connectionClient = connectionClient;
}
@Override
public void onGoAway(Object channel) {
if (!(channel instanceof Channel)) {
return;
}
Channel nettyChannel = ((Channel) channel);
final Attribute attr = nettyChannel.attr(GO_AWAY_KEY);
if (Boolean.TRUE.equals(attr.get())) {
return;
}
attr.set(true);
if (connectionClient != null) {
connectionClient.onGoaway(nettyChannel);
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(String.format("Channel %s go away ,schedule reconnect", nettyChannel));
}
reconnect(nettyChannel);
}
@Override
public void reconnect(Object channel) {
if (!(channel instanceof Channel)) {
return;
}
Channel nettyChannel = ((Channel) channel);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(String.format("Connection %s is reconnecting, attempt=%d", connectionClient, 1));
}
final EventLoop eventLoop = nettyChannel.eventLoop();
eventLoop.schedule(() -> {
try {
connectionClient.doConnect();
} catch (Throwable e) {
LOGGER.error("Fail to connect to " + connectionClient.getChannel(), e);
}
}, 1, TimeUnit.SECONDS);
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
ctx.fireChannelActive();
NettyChannel channel = NettyChannel.getOrAddChannel(ctx.channel(), connectionClient.getUrl(), connectionClient);
if (!connectionClient.isClosed()) {
connectionClient.onConnected(ctx.channel());
if (LOGGER.isInfoEnabled()) {
LOGGER.info("The connection of " + channel.getLocalAddress() + " -> " + channel.getRemoteAddress() + " is established.");
}
} else {
ctx.close();
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
LOGGER.warn(TRANSPORT_UNEXPECTED_EXCEPTION, "", "", String.format("Channel error:%s", ctx.channel()), cause);
ctx.close();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
super.channelInactive(ctx);
final Attribute goawayAttr = ctx.channel().attr(GO_AWAY_KEY);
if (!Boolean.TRUE.equals(goawayAttr.get())) {
reconnect(ctx.channel());
}
}
}