public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { JspFactory _jspxFactory = null; PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out = null; Object page = this; JspWriter _jspx_out = null; PageContext _jspx_page_context = null; try { _jspxFactory = JspFactory.getDefaultFactory(); response.setContentType("text/html; charset=UTF-8"); pageContext = _jspxFactory.getPageContext(this, request, response, null, true, 8192, true); _jspx_page_context = pageContext; application = pageContext.getServletContext(); config = pageContext.getServletConfig(); session = pageContext.getSession(); out = pageContext.getOut(); _jspx_out = out; out.write('\n'); out.write('\n'); out.write("\n\n\n\n<html>\n<head>\n"); JspHelper.createTitle(out, request, request.getParameter("filename")); out.write("\n</head>\n<body>\n<form action=\"/tail.jsp\" method=\"GET\">\n"); generateFileChunks(out, request); out.write("\n</form>\n<hr>\n\n<h2>Local logs</h2>\n<a href=\"/logs/\">Log</a> directory\n\n"); out.println(ServletUtil.htmlFooter()); out.write('\n'); } catch (Throwable t) { if (!(t instanceof SkipPageException)) { out = _jspx_out; if (out != null && out.getBufferSize() != 0) out.clearBuffer(); if (_jspx_page_context != null) _jspx_page_context.handlePageException(t); } } finally { if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context); } }
public void generateFileChunks(JspWriter out, HttpServletRequest req) throws IOException { long startOffset = 0; int chunkSizeToView = 0; String referrer = req.getParameter("referrer"); boolean noLink = false; if (referrer == null) { noLink = true; } String filename = req.getParameter("filename"); if (filename == null) { out.print("Invalid input (file name absent)"); return; } String namenodeInfoPortStr = req.getParameter("namenodeInfoPort"); int namenodeInfoPort = -1; if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr); String chunkSizeToViewStr = req.getParameter("chunkSizeToView"); if (chunkSizeToViewStr != null && Integer.parseInt(chunkSizeToViewStr) > 0) chunkSizeToView = Integer.parseInt(chunkSizeToViewStr); else chunkSizeToView = jspHelper.defaultChunkSizeToView; if (!noLink) { out.print("<h3>Tail of File: "); JspHelper.printPathWithLinks(filename, out, namenodeInfoPort); out.print("</h3><hr>"); out.print("<a href=\"" + referrer + "\">Go Back to File View</a><hr>"); } else { out.print("<h3>" + filename + "</h3>"); } out.print("<b>Chunk size to view (in bytes, up to file's DFS block size): </b>"); out.print( "<input type=\"text\" name=\"chunkSizeToView\" value=" + chunkSizeToView + " size=10 maxlength=10>"); out.print(" <input type=\"submit\" name=\"submit\" value=\"Refresh\"><hr>"); out.print("<input type=\"hidden\" name=\"filename\" value=\"" + filename + "\">"); out.print( "<input type=\"hidden\" name=\"namenodeInfoPort\" value=\"" + namenodeInfoPort + "\">"); if (!noLink) out.print("<input type=\"hidden\" name=\"referrer\" value=\"" + referrer + "\">"); // fetch the block from the datanode that has the last block for this file DFSClient dfs = new DFSClient(jspHelper.nameNodeAddr, jspHelper.conf); List<LocatedBlock> blocks = dfs.namenode.getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks(); if (blocks == null || blocks.size() == 0) { out.print("No datanodes contain blocks of file " + filename); dfs.close(); return; } LocatedBlock lastBlk = blocks.get(blocks.size() - 1); long blockSize = lastBlk.getBlock().getNumBytes(); long blockId = lastBlk.getBlock().getBlockId(); long genStamp = lastBlk.getBlock().getGenerationStamp(); DatanodeInfo chosenNode; try { chosenNode = jspHelper.bestNode(lastBlk); } catch (IOException e) { out.print(e.toString()); dfs.close(); return; } InetSocketAddress addr = NetUtils.createSocketAddr(chosenNode.getName()); // view the last chunkSizeToView bytes while Tailing if (blockSize >= chunkSizeToView) startOffset = blockSize - chunkSizeToView; else startOffset = 0; out.print("<textarea cols=\"100\" rows=\"25\" wrap=\"virtual\" style=\"width:100%\" READONLY>"); jspHelper.streamBlockInAscii( addr, blockId, genStamp, blockSize, startOffset, chunkSizeToView, out); out.print("</textarea>"); dfs.close(); }