| /** |
| * 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.hadoop.hdfs.web.http2; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.Channel; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.http2.Http2Connection; |
| import io.netty.handler.codec.http2.Http2Connection.PropertyKey; |
| import io.netty.handler.codec.http2.Http2Error; |
| import io.netty.handler.codec.http2.Http2EventAdapter; |
| import io.netty.handler.codec.http2.Http2Exception; |
| import io.netty.handler.codec.http2.Http2Headers; |
| import io.netty.handler.codec.http2.Http2Stream; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| /** |
| * Base class of an HTTP/2 FrameListener and EventListener to manage |
| * {@link Http2StreamChannel}s. |
| * <p> |
| * We do not handle onRstStreamRead here, a stream that being reset will also |
| * call onStreamClosed. The upper layer should not rely on a reset event. |
| */ |
| @InterfaceAudience.Private |
| public abstract class AbstractHttp2EventListener extends Http2EventAdapter { |
| |
| protected final Channel parentChannel; |
| |
| protected final Http2Connection conn; |
| |
| protected final PropertyKey subChannelPropKey; |
| |
| protected final AtomicInteger numActiveStreams = new AtomicInteger(0); |
| |
| protected AbstractHttp2EventListener(Channel parentChannel, |
| Http2Connection conn) { |
| this.parentChannel = parentChannel; |
| this.conn = conn; |
| this.subChannelPropKey = conn.newKey(); |
| } |
| |
| protected abstract void initChannelOnStreamActive( |
| Http2StreamChannel subChannel); |
| |
| @Override |
| public void onStreamActive(final Http2Stream stream) { |
| numActiveStreams.incrementAndGet(); |
| Http2StreamChannel subChannel = |
| new Http2StreamChannel(parentChannel, stream); |
| stream.setProperty(subChannelPropKey, subChannel); |
| initChannelOnStreamActive(subChannel); |
| } |
| |
| @Override |
| public void onStreamClosed(Http2Stream stream) { |
| numActiveStreams.decrementAndGet(); |
| Http2StreamChannel subChannel = stream.removeProperty(subChannelPropKey); |
| if (subChannel != null && subChannel.isRegistered()) { |
| subChannel.setClosed(); |
| } |
| } |
| |
| private Http2StreamChannel getSubChannel(int streamId) throws Http2Exception { |
| Http2StreamChannel subChannel = |
| conn.stream(streamId).getProperty(subChannelPropKey); |
| if (subChannel == null) { |
| throw Http2Exception.streamError(streamId, Http2Error.INTERNAL_ERROR, |
| "No sub channel found"); |
| } |
| return subChannel; |
| } |
| |
| private void writeInbound(int streamId, Object msg, boolean endOfStream, |
| int pendingBytes) throws Http2Exception { |
| Http2StreamChannel subChannel = getSubChannel(streamId); |
| subChannel.writeInbound(msg, pendingBytes); |
| if (endOfStream) { |
| subChannel.writeInbound(LastHttp2Message.get(), 0); |
| } |
| if (subChannel.config().isAutoRead()) { |
| subChannel.read(); |
| } |
| } |
| |
| @Override |
| public void onHeadersRead(ChannelHandlerContext ctx, int streamId, |
| Http2Headers headers, int padding, boolean endOfStream) |
| throws Http2Exception { |
| writeInbound(streamId, headers, endOfStream, 0); |
| } |
| |
| @Override |
| public void onHeadersRead(ChannelHandlerContext ctx, int streamId, |
| Http2Headers headers, int streamDependency, short weight, |
| boolean exclusive, int padding, boolean endOfStream) |
| throws Http2Exception { |
| onHeadersRead(ctx, streamId, headers, padding, endOfStream); |
| } |
| |
| @Override |
| public int onDataRead(ChannelHandlerContext ctx, int streamId, ByteBuf data, |
| int padding, boolean endOfStream) throws Http2Exception { |
| int pendingBytes = data.readableBytes() + padding; |
| writeInbound(streamId, data.retain(), endOfStream, pendingBytes); |
| return 0; |
| } |
| |
| public int numActiveStreams() { |
| return numActiveStreams.get(); |
| } |
| } |