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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.api;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
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 ConnectionHandler extends ChannelInboundHandlerAdapter {
private static final ErrorTypeAwareLogger log = LoggerFactory.getErrorTypeAwareLogger(ConnectionHandler.class);
private static final AttributeKey GO_AWAY_KEY = AttributeKey.valueOf("dubbo_channel_goaway");
private final Connection connection;
public ConnectionHandler(Connection connection) {
this.connection = connection;
}
public void onGoAway(Channel channel) {
final Attribute attr = channel.attr(GO_AWAY_KEY);
if (Boolean.TRUE.equals(attr.get())) {
return;
}
attr.set(true);
if (connection != null) {
connection.onGoaway(channel);
}
if (log.isDebugEnabled()) {
log.debug(String.format("Channel %s go away ,schedule reconnect", channel));
}
reconnect(channel);
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
ctx.fireChannelActive();
if (!connection.isClosed()) {
connection.onConnected(ctx.channel());
} else {
ctx.close();
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
log.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());
}
}
private void reconnect(Channel channel) {
if (log.isDebugEnabled()) {
log.debug(String.format("Connection %s is reconnecting, attempt=%d", connection, 1));
}
final EventLoop eventLoop = channel.eventLoop();
eventLoop.schedule(connection::connect, 1, TimeUnit.SECONDS);
}
}