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package com.keuin.kbackupfabric.operation.backup.method;
import org.apache.commons.codec.digest.DigestUtils;
import org.junit.Test;
import java.io.*;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.function.Function;
import static org.apache.commons.io.FileUtils.forceDelete;
import static org.junit.Assert.*;
public class ConfiguredIncrementalBackupMethodTest {
private final String testTempPath = "R:\\";
private final String sourceDirectoryName = "source";
private final String destDirectoryName = "destination";
private final String indexFileName = "index";
private final double directoryFactor = 0.4;
private final double fileFactor = 0.02;
private final int maxRandomFileSizeBytes = 1024 * 1024;
private final Function<Integer, Integer> scaleDecayFunc = (x) -> x - 1;
@Test
public void iterationTest() throws IOException {
int a = 100;
for (int i = 0; i < a; ++i) {
performTest(Math.min(i + 1, 10));
System.out.println("Round " + i + " passed.");
}
}
private void performTest(int scale) throws IOException {
// init source and destination
final Path sourcePath = Paths.get(testTempPath, sourceDirectoryName);
final Path destPath = Paths.get(testTempPath, destDirectoryName);
if (new File(sourcePath.toString()).exists()) {
forceDelete(new File(sourcePath.toString()));
if (!new File(sourcePath.toString()).mkdirs())
fail();
}
if (new File(destPath.toString()).exists()) {
forceDelete(new File(destPath.toString()));
if (!new File(destPath.toString()).mkdirs())
fail();
}
if (new File(testTempPath, indexFileName).exists()) {
if (!new File(testTempPath, indexFileName).delete())
fail();
}
// initialize src
createRandomDirectoryTree(sourcePath.toString(), scale);
String hash1 = calcMD5HashForDir(sourcePath.toFile(), true);
// copy src to dest
ConfiguredIncrementalBackupMethod method = new ConfiguredIncrementalBackupMethod(
indexFileName,
sourcePath.toString(),
testTempPath,
destPath.toString()
);
method.backup();
// delete src
forceDelete(sourcePath.toFile());
assertFalse(sourcePath.toFile().isDirectory());
// restore src
if (!method.restore())
fail();
String hash2 = calcMD5HashForDir(sourcePath.toFile(), true);
assertEquals(hash1, hash2);
}
private void createRandomDirectoryTree(String path, int scale) throws IOException {
if (scale <= 0) {
if (Math.random() < 0.5)
if (!new File(path).mkdirs() && !new File(path).exists())
throw new IOException("Failed to create directory " + path);
return;
}
if (!new File(path).isDirectory() && !new File(path).mkdirs())
throw new IOException("Failed to create directory " + path);
int subFileCount = (int) Math.round(Math.random() * 10 * scale * fileFactor);
for (int i = 0; i < subFileCount; i++) {
String subFile = null;
while (subFile == null || new File(path, subFile).exists())
subFile = getRandomString((int) (Math.random() * 16 + 4));
createRandomFile(new File(path, subFile), maxRandomFileSizeBytes);
}
int subDirCount = (int) Math.round(Math.random() * 10 * scale * directoryFactor);
for (int i = 0; i < subDirCount; i++) {
String subDir = null;
while (subDir == null || new File(path, subDir).exists())
subDir = getRandomString((int) (Math.random() * 16 + 4));
createRandomDirectoryTree(new File(path, subDir).getAbsolutePath(), scaleDecayFunc.apply(scale));
}
}
private static void createRandomFile(File file, int maxSizeBytes) throws IOException {
if (!file.createNewFile())
throw new IOException("Failed to create file " + file.getAbsolutePath());
try (FileOutputStream fileOutputStream = new FileOutputStream(file)) {
int fileBytes = (int) (maxSizeBytes * Math.random() + 1);
Random random = new Random();
final int chunkSize = 1024 * 4;
byte[] randomChunk = new byte[chunkSize];
for (int i = 0; i < fileBytes / chunkSize; i++) {
random.nextBytes(randomChunk);
fileOutputStream.write(randomChunk);
}
if (fileBytes % chunkSize != 0) {
randomChunk = new byte[fileBytes % chunkSize];
random.nextBytes(randomChunk);
fileOutputStream.write(randomChunk);
}
}
}
private static String getRandomString(int length) {
String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random random = new Random();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
int number = random.nextInt(62);
sb.append(str.charAt(number));
}
return sb.toString();
}
public String calcMD5HashForDir(File dirToHash, boolean includeHiddenFiles) {
assert (dirToHash.isDirectory());
Vector<FileInputStream> fileStreams = new Vector<>();
System.out.println("Found files for hashing:");
collectInputStreams(dirToHash, fileStreams, includeHiddenFiles);
SequenceInputStream seqStream =
new SequenceInputStream(fileStreams.elements());
try {
String md5Hash = DigestUtils.md5Hex(seqStream);
seqStream.close();
return md5Hash;
} catch (IOException e) {
throw new RuntimeException("Error reading files to hash in "
+ dirToHash.getAbsolutePath(), e);
}
}
private void collectInputStreams(File dir,
List<FileInputStream> foundStreams,
boolean includeHiddenFiles) {
File[] fileList = dir.listFiles();
Arrays.sort(fileList, // Need in reproducible order
new Comparator<File>() {
public int compare(File f1, File f2) {
return f1.getName().compareTo(f2.getName());
}
});
for (File f : fileList) {
if (!includeHiddenFiles && f.getName().startsWith(".")) {
// Skip it
} else if (f.isDirectory()) {
collectInputStreams(f, foundStreams, includeHiddenFiles);
} else {
try {
System.out.println("\t" + f.getAbsolutePath());
foundStreams.add(new FileInputStream(f));
} catch (FileNotFoundException e) {
throw new AssertionError(e.getMessage()
+ ": file should never not be found!");
}
}
}
}
}
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