package jdk.jfr.internal.tool;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.nio.file.Files;
import java.nio.file.InvalidPathException;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
import jdk.jfr.internal.consumer.ChunkHeader;
import jdk.jfr.internal.consumer.RecordingInput;
final class Disassemble extends Command {
@Override
public String getName() {
return "disassemble";
}
@Override
public List<String> getOptionSyntax() {
List<String> list = new ArrayList<>();
list.add("[--output <directory>]");
list.add("[--max-chunks <chunks>]");
list.add("[--max-size <size>]");
list.add("<file>");
return list;
}
@Override
public void displayOptionUsage(PrintStream stream) {
stream.println(" --output <directory> The location to write the disassembled file,");
stream.println(" by default the current directory");
stream.println("");
stream.println(" --max-chunks <chunks> Maximum number of chunks per disassembled file,");
stream.println(" by default 5. The chunk size varies, but is ");
stream.println(" typically around 15 MB.");
stream.println("");
stream.println(" --max-size <size> Maximum number of bytes per file.");
stream.println("");
stream.println(" <file> Location of the recording file (.jfr)");
}
@Override
public String getDescription() {
return "Disassamble a recording file into smaller files/chunks";
}
@Override
public void execute(Deque<String> options) throws UserSyntaxException, UserDataException {
if (options.isEmpty()) {
throw new UserSyntaxException("missing file");
}
Path file = getJFRInputFile(options);
int maxChunks = Integer.MAX_VALUE;
int maxsize = Integer.MAX_VALUE;
String output = System.getProperty("user.dir");
int optionCount = options.size();
while (optionCount > 0) {
if (acceptOption(options, "--output")) {
output = options.pop();
}
if (acceptOption(options, "--max-size")) {
String value = options.pop();
try {
maxsize = Integer.parseInt(value);
if (maxsize < 1) {
throw new UserDataException("max size must be at least 1");
}
} catch (NumberFormatException nfe) {
throw new UserDataException("not a valid value for --max-size.");
}
}
if (acceptOption(options, "--max-chunks")) {
String value = options.pop();
try {
maxChunks = Integer.parseInt(value);
if (maxChunks < 1) {
throw new UserDataException("max chunks must be at least 1.");
}
} catch (NumberFormatException nfe) {
throw new UserDataException("not a valid value for --max-size.");
}
}
if (optionCount == options.size()) {
throw new UserSyntaxException("unknown option " + options.peek());
}
optionCount = options.size();
}
Path outputPath = getDirectory(output);
println();
println("Examining recording " + file + " ...");
List<Long> sizes;
if (maxsize != Integer.MAX_VALUE && maxChunks == Integer.MAX_VALUE) {
try {
long fileSize = Files.size(file);
if (maxsize >=fileSize) {
println();
println("File size (" + fileSize +") does not exceed max size (" + maxsize + ")");
return;
}
} catch (IOException e) {
throw new UserDataException("unexpected i/o error when determining file size" + e.getMessage());
}
}
if (maxsize == Integer.MAX_VALUE && maxChunks == Integer.MAX_VALUE) {
maxChunks = 5;
}
try {
sizes = findChunkSizes(file);
} catch (IOException e) {
throw new UserDataException("unexpected i/o error. " + e.getMessage());
}
if (maxsize == Integer.MAX_VALUE == sizes.size() <= maxChunks) {
throw new UserDataException("number of chunks in recording (" + sizes.size() + ") doesn't exceed max chunks (" + maxChunks + ")");
}
println();
if (sizes.size() > 0) {
List<Long> combinedSizes = combineChunkSizes(sizes, maxChunks, maxsize);
print("File consists of " + sizes.size() + " chunks. The recording will be split into ");
println(combinedSizes.size() + " files");
println();
splitFile(outputPath, file, combinedSizes);
} else {
throw new UserDataException("no JFR chunks found in file.");
}
}
private List<Long> findChunkSizes(Path p) throws IOException {
try (RecordingInput input = new RecordingInput(p.toFile())) {
List<Long> sizes = new ArrayList<>();
ChunkHeader ch = new ChunkHeader(input);
sizes.add(ch.getSize());
while (!ch.isLastChunk()) {
ch = ch.nextHeader();
sizes.add(ch.getSize());
}
return sizes;
}
}
private List<Long> combineChunkSizes(List<Long> sizes, int maxChunks, long maxSize) {
List<Long> reduced = new ArrayList<Long>();
int chunks = 1;
long fileSize = sizes.get(0);
for (int i = 1; i < sizes.size(); i++) {
long size = sizes.get(i);
if (fileSize + size > maxSize) {
reduced.add(fileSize);
chunks = 1;
fileSize = size;
continue;
}
fileSize += size;
if (chunks == maxChunks) {
reduced.add(fileSize);
fileSize = 0;
chunks = 1;
continue;
}
chunks++;
}
if (fileSize != 0) {
reduced.add(fileSize);
}
return reduced;
}
private void splitFile(Path directory, Path file, List<Long> splitPositions) throws UserDataException {
int padAmountZeros = String.valueOf(splitPositions.size() - 1).length();
String fileName = file.getFileName().toString();
String fileFormatter = fileName.subSequence(0, fileName.length() - 4) + "_%0" + padAmountZeros + "d.jfr";
for (int i = 0; i < splitPositions.size(); i++) {
String formattedFilename = String.format(fileFormatter, i);
try {
Path p = directory.resolve(formattedFilename);
if (Files.exists(p)) {
throw new UserDataException("can't create disassembled file " + p + ", a file with that name already exist");
}
} catch (InvalidPathException ipe) {
throw new UserDataException("can't construct path with filename" + formattedFilename);
}
}
try (DataInputStream stream = new DataInputStream(new BufferedInputStream(new FileInputStream(file.toFile())))) {
for (int i = 0; i < splitPositions.size(); i++) {
Long l = splitPositions.get(i);
byte[] bytes = readBytes(stream, l.intValue());
String formattedFilename = String.format(fileFormatter, i);
Path p = directory.resolve(formattedFilename);
File splittedFile = p.toFile();
println("Writing " + splittedFile + " ... " + bytes.length);
FileOutputStream fos = new FileOutputStream(splittedFile);
fos.write(bytes);
fos.close();
}
} catch (IOException ioe) {
throw new UserDataException("i/o error writing file " + file);
}
}
private byte[] readBytes(InputStream stream, int count) throws UserDataException, IOException {
byte[] data = new byte[count];
int totalRead = 0;
while (totalRead < data.length) {
int read = stream.read(data, totalRead, data.length - totalRead);
if (read == -1) {
throw new UserDataException("unexpected end of data");
}
totalRead += read;
}
return data;
}
}
Disassemble
getName(): String
findChunkSizes(Path): List<Long>
