| /** |
| * 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.namenode; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.PrintWriter; |
| import java.net.InetSocketAddress; |
| import java.util.Enumeration; |
| import java.util.List; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSInputStream; |
| import org.apache.hadoop.hdfs.DFSClient; |
| import org.apache.hadoop.hdfs.DFSInputStream; |
| import org.apache.hadoop.hdfs.server.common.JspHelper; |
| import org.apache.hadoop.hdfs.server.datanode.DataNode; |
| import org.apache.hadoop.hdfs.server.datanode.DatanodeJspHelper; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.mortbay.jetty.InclusiveByteRange; |
| |
| @InterfaceAudience.Private |
| public class StreamFile extends DfsServlet { |
| /** for java.io.Serializable */ |
| private static final long serialVersionUID = 1L; |
| |
| public static final String CONTENT_LENGTH = "Content-Length"; |
| |
| static DataNode datanode = DataNode.getDataNode(); |
| |
| /** getting a client for connecting to dfs */ |
| protected DFSClient getDFSClient(HttpServletRequest request) |
| throws IOException, InterruptedException { |
| final Configuration conf = |
| (Configuration) getServletContext().getAttribute(JspHelper.CURRENT_CONF); |
| UserGroupInformation ugi = getUGI(request, conf); |
| return DatanodeJspHelper.getDFSClient(request, datanode, conf, ugi); |
| } |
| |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| final String path = request.getPathInfo() != null ? |
| request.getPathInfo() : "/"; |
| final String filename = JspHelper.validatePath(path); |
| if (filename == null) { |
| response.setContentType("text/plain"); |
| PrintWriter out = response.getWriter(); |
| out.print("Invalid input"); |
| return; |
| } |
| |
| Enumeration<?> reqRanges = request.getHeaders("Range"); |
| if (reqRanges != null && !reqRanges.hasMoreElements()) |
| reqRanges = null; |
| |
| DFSClient dfs; |
| try { |
| dfs = getDFSClient(request); |
| } catch (InterruptedException e) { |
| response.sendError(400, e.getMessage()); |
| return; |
| } |
| |
| final DFSInputStream in = dfs.open(filename); |
| final long fileLen = in.getFileLength(); |
| OutputStream os = response.getOutputStream(); |
| |
| try { |
| if (reqRanges != null) { |
| List<?> ranges = InclusiveByteRange.satisfiableRanges(reqRanges, |
| fileLen); |
| StreamFile.sendPartialData(in, os, response, fileLen, ranges); |
| } else { |
| // No ranges, so send entire file |
| response.setHeader("Content-Disposition", "attachment; filename=\"" + |
| filename + "\""); |
| response.setContentType("application/octet-stream"); |
| response.setHeader(CONTENT_LENGTH, "" + fileLen); |
| StreamFile.writeTo(in, os, 0L, fileLen); |
| } |
| } catch(IOException e) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("response.isCommitted()=" + response.isCommitted(), e); |
| } |
| throw e; |
| } finally { |
| try { |
| in.close(); |
| os.close(); |
| } finally { |
| dfs.close(); |
| } |
| } |
| } |
| |
| static void sendPartialData(FSInputStream in, |
| OutputStream os, |
| HttpServletResponse response, |
| long contentLength, |
| List<?> ranges) |
| throws IOException { |
| |
| if (ranges == null || ranges.size() != 1) { |
| // if there are no satisfiable ranges, or if multiple ranges are |
| // requested (we don't support multiple range requests), send 416 response |
| response.setContentLength(0); |
| int status = HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE; |
| response.setStatus(status); |
| response.setHeader("Content-Range", |
| InclusiveByteRange.to416HeaderRangeString(contentLength)); |
| } else { |
| // if there is only a single valid range (must be satisfiable |
| // since were here now), send that range with a 206 response |
| InclusiveByteRange singleSatisfiableRange = |
| (InclusiveByteRange)ranges.get(0); |
| long singleLength = singleSatisfiableRange.getSize(contentLength); |
| response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); |
| response.setHeader("Content-Range", |
| singleSatisfiableRange.toHeaderRangeString(contentLength)); |
| System.out.println("first: "+singleSatisfiableRange.getFirst(contentLength)); |
| System.out.println("singleLength: "+singleLength); |
| |
| StreamFile.writeTo(in, |
| os, |
| singleSatisfiableRange.getFirst(contentLength), |
| singleLength); |
| } |
| } |
| |
| static void writeTo(FSInputStream in, |
| OutputStream os, |
| long start, |
| long count) |
| throws IOException { |
| byte buf[] = new byte[4096]; |
| long bytesRemaining = count; |
| int bytesRead; |
| int bytesToRead; |
| |
| in.seek(start); |
| |
| while (true) { |
| // number of bytes to read this iteration |
| bytesToRead = (int)(bytesRemaining<buf.length ? |
| bytesRemaining: |
| buf.length); |
| |
| // number of bytes actually read this iteration |
| bytesRead = in.read(buf, 0, bytesToRead); |
| |
| // if we can't read anymore, break |
| if (bytesRead == -1) { |
| break; |
| } |
| |
| os.write(buf, 0, bytesRead); |
| |
| bytesRemaining -= bytesRead; |
| |
| // if we don't need to read anymore, break |
| if (bytesRemaining <= 0) { |
| break; |
| } |
| |
| } |
| } |
| } |