dubbo QosProcessHandler 源码
dubbo QosProcessHandler 代码
文件路径:/dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/server/handler/QosProcessHandler.java
/*
* 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.qos.server.handler;
import org.apache.dubbo.common.utils.ExecutorUtil;
import org.apache.dubbo.rpc.model.FrameworkModel;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.CharsetUtil;
import io.netty.util.concurrent.ScheduledFuture;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class QosProcessHandler extends ByteToMessageDecoder {
private ScheduledFuture<?> welcomeFuture;
private String welcome;
// true means to accept foreign IP
private boolean acceptForeignIp;
private FrameworkModel frameworkModel;
public static final String PROMPT = "dubbo>";
public QosProcessHandler(FrameworkModel frameworkModel, String welcome, boolean acceptForeignIp) {
this.frameworkModel = frameworkModel;
this.welcome = welcome;
this.acceptForeignIp = acceptForeignIp;
}
@Override
public void channelActive(final ChannelHandlerContext ctx) throws Exception {
welcomeFuture = ctx.executor().schedule(() -> {
if (welcome != null) {
ctx.write(Unpooled.wrappedBuffer(welcome.getBytes()));
ctx.writeAndFlush(Unpooled.wrappedBuffer(PROMPT.getBytes()));
}
}, 500, TimeUnit.MILLISECONDS);
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
if (in.readableBytes() < 1) {
return;
}
// read one byte to guess protocol
final int magic = in.getByte(in.readerIndex());
ChannelPipeline p = ctx.pipeline();
p.addLast(new LocalHostPermitHandler(acceptForeignIp));
if (isHttp(magic)) {
// no welcome output for http protocol
if (welcomeFuture != null && welcomeFuture.isCancellable()) {
welcomeFuture.cancel(false);
}
p.addLast(new HttpServerCodec());
p.addLast(new HttpObjectAggregator(1048576));
p.addLast(new HttpProcessHandler(frameworkModel));
p.remove(this);
} else {
p.addLast(new LineBasedFrameDecoder(2048));
p.addLast(new StringDecoder(CharsetUtil.UTF_8));
p.addLast(new StringEncoder(CharsetUtil.UTF_8));
p.addLast(new IdleStateHandler(0, 0, 5 * 60));
p.addLast(new TelnetIdleEventHandler());
p.addLast(new TelnetProcessHandler(frameworkModel));
p.remove(this);
}
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof IdleStateEvent) {
ExecutorUtil.cancelScheduledFuture(welcomeFuture);
ctx.close();
}
}
// G for GET, and P for POST
private static boolean isHttp(int magic) {
return magic == 'G' || magic == 'P';
}
}
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