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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.filedistribution;
import com.yahoo.config.FileReference;
import com.yahoo.io.IOUtils;
import java.util.logging.Level;
import com.yahoo.text.Utf8;
import net.jpountz.xxhash.XXHash64;
import net.jpountz.xxhash.XXHashFactory;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.logging.Logger;
public class FileDirectory {
private static final Logger log = Logger.getLogger(FileDirectory.class.getName());
private final File root;
public FileDirectory(File rootDir) {
root = rootDir;
try {
ensureRootExist();
} catch (IllegalArgumentException e) {
log.log(Level.WARNING, "Failed creating directory in constructor, will retry on demand : " + e.getMessage());
}
}
private void ensureRootExist() {
if (! root.exists()) {
if ( ! root.mkdir()) {
throw new IllegalArgumentException("Failed creating root dir '" + root.getAbsolutePath() + "'.");
}
} else if (!root.isDirectory()) {
throw new IllegalArgumentException("'" + root.getAbsolutePath() + "' is not a directory");
}
}
static private class Filter implements FilenameFilter {
@Override
public boolean accept(File dir, String name) {
return !".".equals(name) && !"..".equals(name) ;
}
}
String getPath(FileReference ref) {
return root.getAbsolutePath() + "/" + ref.value();
}
public File getFile(FileReference reference) {
ensureRootExist();
File dir = new File(getPath(reference));
if (!dir.exists()) {
throw new IllegalArgumentException("File reference '" + reference.value() + "' with absolute path '" + dir.getAbsolutePath() + "' does not exist.");
}
if (!dir.isDirectory()) {
throw new IllegalArgumentException("File reference '" + reference.value() + "' with absolute path '" + dir.getAbsolutePath() + "' is not a directory.");
}
File [] files = dir.listFiles(new Filter());
if (files == null || files.length == 0) {
throw new IllegalArgumentException("File reference '" + reference.value() + "' with absolute path '" + dir.getAbsolutePath() + " does not contain any files");
}
return files[0];
}
File getRoot() {
return root;
}
private Long computeHash(File file) throws IOException {
XXHash64 hasher = XXHashFactory.fastestInstance().hash64();
if (file.isDirectory()) {
return Files.walk(file.toPath(), 100).map(path -> {
try {
log.log(Level.FINE, () -> "Calculating hash for '" + path + "'");
return hash(path.toFile(), hasher);
} catch (IOException e) {
log.log(Level.WARNING, "Failed getting hash from '" + path + "'");
return 0;
}
}).mapToLong(Number::longValue).sum();
} else {
return hash(file, hasher);
}
}
private long hash(File file, XXHash64 hasher) throws IOException {
byte[] wholeFile = file.isDirectory() ? new byte[0] : IOUtils.readFileBytes(file);
return hasher.hash(ByteBuffer.wrap(wholeFile), hasher.hash(ByteBuffer.wrap(Utf8.toBytes(file.getName())), 0));
}
public FileReference addFile(File source) throws IOException {
Long hash = computeHash(source);
verifyExistingFile(source, hash);
FileReference fileReference = fileReferenceFromHash(hash);
return addFile(source, fileReference);
}
// If there exists a directory for a file reference, but content does not have correct hash or the file we want to add
// does not exist in the directory, delete it
private void verifyExistingFile(File source, Long hashOfFileToBeAdded) throws IOException {
FileReference fileReference = fileReferenceFromHash(hashOfFileToBeAdded);
File destinationDir = destinationDir(fileReference);
if (!destinationDir.exists()) return;
File existingFile = destinationDir.toPath().resolve(source.getName()).toFile();
if ( ! existingFile.exists() || ! computeHash(existingFile).equals(hashOfFileToBeAdded)) {
log.log(Level.SEVERE, "Directory for file reference '" + fileReference.value() +
"' has content that does not match its hash, deleting everything in " +
destinationDir.getAbsolutePath());
IOUtils.recursiveDeleteDir(destinationDir);
}
}
private File destinationDir(FileReference fileReference) {
return new File(root, fileReference.value());
}
private FileReference fileReferenceFromHash(Long hash) {
return new FileReference(Long.toHexString(hash));
}
FileReference addFile(File source, FileReference reference) {
ensureRootExist();
try {
logfileInfo(source);
File destinationDir = destinationDir(reference);
Path tempDestinationDir = Files.createTempDirectory(root.toPath(), "writing");
File destination = new File(tempDestinationDir.toFile(), source.getName());
if (!destinationDir.exists()) {
destinationDir.mkdir();
log.log(Level.FINE, () -> "file reference ' " + reference.value() + "', source: " + source.getAbsolutePath() );
if (source.isDirectory()) {
log.log(Level.FINE, () -> "Copying source " + source.getAbsolutePath() + " to " + destination.getAbsolutePath());
IOUtils.copyDirectory(source, destination, -1);
} else {
copyFile(source, destination);
}
if (!destinationDir.exists()) {
log.log(Level.FINE, () -> "Moving from " + tempDestinationDir + " to " + destinationDir.getAbsolutePath());
if ( ! tempDestinationDir.toFile().renameTo(destinationDir)) {
log.log(Level.WARNING, "Failed moving '" + tempDestinationDir.toFile().getAbsolutePath() + "' to '" + destination.getAbsolutePath() + "'.");
}
} else {
IOUtils.copyDirectory(tempDestinationDir.toFile(), destinationDir, -1);
}
}
IOUtils.recursiveDeleteDir(tempDestinationDir.toFile());
return reference;
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
}
private void logfileInfo(File file ) throws IOException {
BasicFileAttributes basicFileAttributes = Files.readAttributes(file.toPath(), BasicFileAttributes.class);
log.log(Level.FINE, () -> "Adding file " + file.getAbsolutePath() + " (created " + basicFileAttributes.creationTime() +
", modified " + basicFileAttributes.lastModifiedTime() +
", size " + basicFileAttributes.size() + ")");
}
private static void copyFile(File source, File dest) throws IOException {
try (FileChannel sourceChannel = new FileInputStream(source).getChannel();
FileChannel destChannel = new FileOutputStream(dest).getChannel()) {
destChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
}
}
@Override
public String toString() {
return "root dir: " + root.getAbsolutePath();
}
}
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