| /** |
| * 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.server.datanode.web.webhdfs; |
| |
| import io.netty.channel.ChannelFutureListener; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.SimpleChannelInboundHandler; |
| import io.netty.handler.codec.http.DefaultHttpResponse; |
| import io.netty.handler.codec.http.HttpContent; |
| import io.netty.handler.codec.http.LastHttpContent; |
| import org.apache.commons.logging.Log; |
| import org.apache.hadoop.hdfs.DFSClient; |
| import org.apache.hadoop.io.IOUtils; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION; |
| import static io.netty.handler.codec.http.HttpHeaders.Values.CLOSE; |
| |
| class HdfsWriter extends SimpleChannelInboundHandler<HttpContent> { |
| private final DFSClient client; |
| private final OutputStream out; |
| private final DefaultHttpResponse response; |
| private static final Log LOG = WebHdfsHandler.LOG; |
| |
| HdfsWriter(DFSClient client, OutputStream out, DefaultHttpResponse response) { |
| this.client = client; |
| this.out = out; |
| this.response = response; |
| } |
| |
| @Override |
| public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { |
| ctx.flush(); |
| } |
| |
| @Override |
| protected void channelRead0(ChannelHandlerContext ctx, HttpContent chunk) |
| throws IOException { |
| chunk.content().readBytes(out, chunk.content().readableBytes()); |
| if (chunk instanceof LastHttpContent) { |
| try { |
| releaseDfsResourcesAndThrow(); |
| response.headers().set(CONNECTION, CLOSE); |
| ctx.write(response).addListener(ChannelFutureListener.CLOSE); |
| } catch (Exception cause) { |
| exceptionCaught(ctx, cause); |
| } |
| } |
| } |
| |
| @Override |
| public void channelInactive(ChannelHandlerContext ctx) { |
| releaseDfsResources(); |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { |
| releaseDfsResources(); |
| DefaultHttpResponse resp = ExceptionHandler.exceptionCaught(cause); |
| resp.headers().set(CONNECTION, CLOSE); |
| ctx.writeAndFlush(resp).addListener(ChannelFutureListener.CLOSE); |
| if (LOG != null && LOG.isDebugEnabled()) { |
| LOG.debug("Exception in channel handler ", cause); |
| } |
| } |
| |
| private void releaseDfsResources() { |
| IOUtils.cleanup(LOG, out); |
| IOUtils.cleanup(LOG, client); |
| } |
| |
| private void releaseDfsResourcesAndThrow() throws Exception { |
| out.close(); |
| client.close(); |
| } |
| } |