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// Copyright 2017 Yahoo Holdings. 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.config.model.api.FileDistribution;
import com.yahoo.io.IOUtils;
import com.yahoo.text.Utf8;
import net.jpountz.xxhash.XXHash64;
import net.jpountz.xxhash.XXHashFactory;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.logging.Logger;
public class FileDirectory {
private static final Logger log = Logger.getLogger(FileDirectory.class.getName());
private final File root;
public FileDirectory() {
this(FileDistribution.getDefaultFileDBPath());
}
public FileDirectory(File rootDir) {
root = rootDir;
try {
ensureRootExist();
} catch (IllegalArgumentException e) {
log.warning("Failed creating directory in constructor, will retry on demand : " + e.toString());
}
}
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();
}
File getFile(FileReference reference) {
ensureRootExist();
File dir = new File(getPath(reference));
if (!dir.exists()) {
throw new IllegalArgumentException("File reference '" + reference.toString() + "' with absolute path '" + dir.getAbsolutePath() + "' does not exist.");
}
if (!dir.isDirectory()) {
throw new IllegalArgumentException("File reference '" + reference.toString() + "' with absolute path '" + dir.getAbsolutePath() + "' is not a directory.");
}
File [] files = dir.listFiles(new Filter());
if (files.length != 1) {
StringBuilder msg = new StringBuilder();
for (File f: files) {
msg.append(f.getName()).append("\n");
}
throw new IllegalArgumentException("File reference '" + reference.toString() + "' with absolute path '" + dir.getAbsolutePath() + " does not contain exactly one file, but [" + msg.toString() + "]");
}
return files[0];
}
private Long computeReference(File file) throws IOException {
byte [] wholeFile = IOUtils.readFileBytes(file);
XXHash64 hasher = XXHashFactory.fastestInstance().hash64();
return hasher.hash(ByteBuffer.wrap(wholeFile), hasher.hash(ByteBuffer.wrap(Utf8.toBytes(file.getName())), 0));
}
public FileReference addFile(File source) {
try {
Long hash = computeReference(source);
FileReference reference = new FileReference(Long.toHexString(hash));
return addFile(source, reference);
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
}
public FileReference addFile(File source, FileReference reference) {
ensureRootExist();
try {
File destinationDir = new File(root, reference.value());
if (!destinationDir.exists()) {
destinationDir.mkdir();
Path tempDestinationDir = Files.createTempDirectory(root.toPath(), "writing");
File destination = new File(tempDestinationDir.toFile(), source.getName());
if (source.isDirectory())
IOUtils.copyDirectory(source, destination);
else
IOUtils.copy(source, destination);
if (!destinationDir.exists()) {
if ( ! tempDestinationDir.toFile().renameTo(destinationDir)) {
log.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);
}
}
}
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