251 lines
9.9 KiB
Java
251 lines
9.9 KiB
Java
/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.internal.tool;
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import java.io.BufferedInputStream;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.PrintStream;
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import java.nio.file.Files;
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import java.nio.file.InvalidPathException;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.Deque;
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import java.util.List;
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import jdk.jfr.internal.consumer.ChunkHeader;
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import jdk.jfr.internal.consumer.RecordingInput;
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final class Disassemble extends Command {
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@Override
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public String getName() {
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return "disassemble";
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}
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@Override
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public List<String> getOptionSyntax() {
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List<String> list = new ArrayList<>();
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list.add("[--output <directory>]");
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list.add("[--max-chunks <chunks>]");
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list.add("[--max-size <size>]");
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list.add("<file>");
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return list;
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}
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@Override
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public void displayOptionUsage(PrintStream stream) {
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stream.println(" --output <directory> The location to write the disassembled file,");
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stream.println(" by default the current directory");
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stream.println("");
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stream.println(" --max-chunks <chunks> Maximum number of chunks per disassembled file,");
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stream.println(" by default 5. The chunk size varies, but is ");
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stream.println(" typically around 15 MB.");
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stream.println("");
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stream.println(" --max-size <size> Maximum number of bytes per file.");
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stream.println("");
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stream.println(" <file> Location of the recording file (.jfr)");
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}
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@Override
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public String getDescription() {
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return "Disassamble a recording file into smaller files/chunks";
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}
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@Override
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public void execute(Deque<String> options) throws UserSyntaxException, UserDataException {
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if (options.isEmpty()) {
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throw new UserSyntaxException("missing file");
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}
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Path file = getJFRInputFile(options);
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int maxChunks = Integer.MAX_VALUE;
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int maxsize = Integer.MAX_VALUE;
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String output = System.getProperty("user.dir");
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int optionCount = options.size();
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while (optionCount > 0) {
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if (acceptOption(options, "--output")) {
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output = options.pop();
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}
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if (acceptOption(options, "--max-size")) {
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String value = options.pop();
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try {
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maxsize = Integer.parseInt(value);
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if (maxsize < 1) {
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throw new UserDataException("max size must be at least 1");
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}
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} catch (NumberFormatException nfe) {
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throw new UserDataException("not a valid value for --max-size.");
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}
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}
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if (acceptOption(options, "--max-chunks")) {
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String value = options.pop();
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try {
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maxChunks = Integer.parseInt(value);
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if (maxChunks < 1) {
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throw new UserDataException("max chunks must be at least 1.");
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}
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} catch (NumberFormatException nfe) {
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throw new UserDataException("not a valid value for --max-size.");
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}
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}
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if (optionCount == options.size()) {
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// No progress made
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throw new UserSyntaxException("unknown option " + options.peek());
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}
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optionCount = options.size();
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}
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Path outputPath = getDirectory(output);
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println();
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println("Examining recording " + file + " ...");
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List<Long> sizes;
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if (maxsize != Integer.MAX_VALUE && maxChunks == Integer.MAX_VALUE) {
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try {
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long fileSize = Files.size(file);
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if (maxsize >=fileSize) {
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println();
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println("File size (" + fileSize +") does not exceed max size (" + maxsize + ")");
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return;
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}
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} catch (IOException e) {
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throw new UserDataException("unexpected i/o error when determining file size" + e.getMessage());
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}
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}
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if (maxsize == Integer.MAX_VALUE && maxChunks == Integer.MAX_VALUE) {
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maxChunks = 5;
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}
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try {
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sizes = findChunkSizes(file);
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} catch (IOException e) {
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throw new UserDataException("unexpected i/o error. " + e.getMessage());
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}
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if (maxsize == Integer.MAX_VALUE == sizes.size() <= maxChunks) {
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throw new UserDataException("number of chunks in recording (" + sizes.size() + ") doesn't exceed max chunks (" + maxChunks + ")");
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}
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println();
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if (sizes.size() > 0) {
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List<Long> combinedSizes = combineChunkSizes(sizes, maxChunks, maxsize);
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print("File consists of " + sizes.size() + " chunks. The recording will be split into ");
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println(combinedSizes.size() + " files");
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println();
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splitFile(outputPath, file, combinedSizes);
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} else {
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throw new UserDataException("no JFR chunks found in file.");
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}
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}
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private List<Long> findChunkSizes(Path p) throws IOException {
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try (RecordingInput input = new RecordingInput(p.toFile())) {
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List<Long> sizes = new ArrayList<>();
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ChunkHeader ch = new ChunkHeader(input);
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sizes.add(ch.getSize());
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while (!ch.isLastChunk()) {
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ch = ch.nextHeader();
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sizes.add(ch.getSize());
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}
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return sizes;
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}
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}
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private List<Long> combineChunkSizes(List<Long> sizes, int maxChunks, long maxSize) {
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List<Long> reduced = new ArrayList<Long>();
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int chunks = 1;
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long fileSize = sizes.get(0);
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for (int i = 1; i < sizes.size(); i++) {
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long size = sizes.get(i);
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if (fileSize + size > maxSize) {
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reduced.add(fileSize);
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chunks = 1;
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fileSize = size;
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continue;
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}
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fileSize += size;
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if (chunks == maxChunks) {
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reduced.add(fileSize);
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fileSize = 0;
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chunks = 1;
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continue;
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}
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chunks++;
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}
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if (fileSize != 0) {
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reduced.add(fileSize);
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}
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return reduced;
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}
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private void splitFile(Path directory, Path file, List<Long> splitPositions) throws UserDataException {
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int padAmountZeros = String.valueOf(splitPositions.size() - 1).length();
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String fileName = file.getFileName().toString();
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String fileFormatter = fileName.subSequence(0, fileName.length() - 4) + "_%0" + padAmountZeros + "d.jfr";
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for (int i = 0; i < splitPositions.size(); i++) {
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String formattedFilename = String.format(fileFormatter, i);
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try {
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Path p = directory.resolve(formattedFilename);
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if (Files.exists(p)) {
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throw new UserDataException("can't create disassembled file " + p + ", a file with that name already exist");
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}
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} catch (InvalidPathException ipe) {
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throw new UserDataException("can't construct path with filename" + formattedFilename);
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}
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}
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try (DataInputStream stream = new DataInputStream(new BufferedInputStream(new FileInputStream(file.toFile())))) {
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for (int i = 0; i < splitPositions.size(); i++) {
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Long l = splitPositions.get(i);
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byte[] bytes = readBytes(stream, l.intValue());
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String formattedFilename = String.format(fileFormatter, i);
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Path p = directory.resolve(formattedFilename);
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File splittedFile = p.toFile();
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println("Writing " + splittedFile + " ... " + bytes.length);
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FileOutputStream fos = new FileOutputStream(splittedFile);
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fos.write(bytes);
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fos.close();
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}
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} catch (IOException ioe) {
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throw new UserDataException("i/o error writing file " + file);
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}
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}
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private byte[] readBytes(InputStream stream, int count) throws UserDataException, IOException {
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byte[] data = new byte[count];
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int totalRead = 0;
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while (totalRead < data.length) {
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int read = stream.read(data, totalRead, data.length - totalRead);
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if (read == -1) {
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throw new UserDataException("unexpected end of data");
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}
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totalRead += read;
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}
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return data;
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}
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}
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