ch.qos.logback.core.rolling.helper.Compressor Maven / Gradle / Ivy
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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.rolling.helper;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import ch.qos.logback.core.rolling.RolloverFailure;
import ch.qos.logback.core.spi.ContextAwareBase;
import ch.qos.logback.core.status.ErrorStatus;
import ch.qos.logback.core.status.WarnStatus;
import ch.qos.logback.core.util.FileUtil;
/**
* The Compression class implements ZIP and GZ file
* compression/decompression methods.
*
* @author Ceki Gülcü
*/
public class Compressor extends ContextAwareBase {
final CompressionMode compressionMode;
static final int BUFFER_SIZE = 8192;
public Compressor(CompressionMode compressionMode) {
this.compressionMode = compressionMode;
}
/**
* @param nameOfFile2Compress
* @param nameOfCompressedFile
* @param innerEntryName
* The name of the file within the zip file. Use for ZIP compression.
*/
public void compress(String nameOfFile2Compress, String nameOfCompressedFile, String innerEntryName) {
switch (compressionMode) {
case GZ:
gzCompress(nameOfFile2Compress, nameOfCompressedFile);
break;
case ZIP:
zipCompress(nameOfFile2Compress, nameOfCompressedFile, innerEntryName);
break;
case NONE:
throw new UnsupportedOperationException("compress method called in NONE compression mode");
}
}
private void zipCompress(String nameOfFile2zip, String nameOfZippedFile, String innerEntryName) {
File file2zip = new File(nameOfFile2zip);
if (!file2zip.exists()) {
addStatus(new WarnStatus("The file to compress named [" + nameOfFile2zip + "] does not exist.", this));
return;
}
if (innerEntryName == null) {
addStatus(new WarnStatus("The innerEntryName parameter cannot be null", this));
return;
}
if (!nameOfZippedFile.endsWith(".zip")) {
nameOfZippedFile = nameOfZippedFile + ".zip";
}
File zippedFile = new File(nameOfZippedFile);
if (zippedFile.exists()) {
addStatus(new WarnStatus("The target compressed file named [" + nameOfZippedFile + "] exist already.", this));
return;
}
addInfo("ZIP compressing [" + file2zip + "] as [" + zippedFile + "]");
createMissingTargetDirsIfNecessary(zippedFile);
BufferedInputStream bis = null;
ZipOutputStream zos = null;
try {
bis = new BufferedInputStream(new FileInputStream(nameOfFile2zip));
zos = new ZipOutputStream(new FileOutputStream(nameOfZippedFile));
ZipEntry zipEntry = computeZipEntry(innerEntryName);
zos.putNextEntry(zipEntry);
byte[] inbuf = new byte[BUFFER_SIZE];
int n;
while ((n = bis.read(inbuf)) != -1) {
zos.write(inbuf, 0, n);
}
bis.close();
bis = null;
zos.close();
zos = null;
if (!file2zip.delete()) {
addStatus(new WarnStatus("Could not delete [" + nameOfFile2zip + "].", this));
}
} catch (Exception e) {
addStatus(new ErrorStatus("Error occurred while compressing [" + nameOfFile2zip + "] into [" + nameOfZippedFile + "].", this, e));
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
// ignore
}
}
if (zos != null) {
try {
zos.close();
} catch (IOException e) {
// ignore
}
}
}
}
// http://jira.qos.ch/browse/LBCORE-98
// The name of the compressed file as nested within the zip archive
//
// Case 1: RawFile = null, Patern = foo-%d.zip
// nestedFilename = foo-${current-date}
//
// Case 2: RawFile = hello.txt, Pattern = = foo-%d.zip
// nestedFilename = foo-${current-date}
//
// in both cases, the strategy consisting of removing the compression
// suffix of zip file works reasonably well. The alternative strategy
// whereby the nested file name was based on the value of the raw file name
// (applicable to case 2 only) has the disadvantage of the nested files
// all having the same name, which could make it harder for the user
// to unzip the file without collisions
ZipEntry computeZipEntry(File zippedFile) {
return computeZipEntry(zippedFile.getName());
}
ZipEntry computeZipEntry(String filename) {
String nameOfFileNestedWithinArchive = computeFileNameStrWithoutCompSuffix(filename, compressionMode);
return new ZipEntry(nameOfFileNestedWithinArchive);
}
private void gzCompress(String nameOfFile2gz, String nameOfgzedFile) {
File file2gz = new File(nameOfFile2gz);
if (!file2gz.exists()) {
addStatus(new WarnStatus("The file to compress named [" + nameOfFile2gz + "] does not exist.", this));
return;
}
if (!nameOfgzedFile.endsWith(".gz")) {
nameOfgzedFile = nameOfgzedFile + ".gz";
}
File gzedFile = new File(nameOfgzedFile);
if (gzedFile.exists()) {
addWarn("The target compressed file named [" + nameOfgzedFile + "] exist already. Aborting file compression.");
return;
}
addInfo("GZ compressing [" + file2gz + "] as [" + gzedFile + "]");
createMissingTargetDirsIfNecessary(gzedFile);
BufferedInputStream bis = null;
GZIPOutputStream gzos = null;
try {
bis = new BufferedInputStream(new FileInputStream(nameOfFile2gz));
gzos = new GZIPOutputStream(new FileOutputStream(nameOfgzedFile));
byte[] inbuf = new byte[BUFFER_SIZE];
int n;
while ((n = bis.read(inbuf)) != -1) {
gzos.write(inbuf, 0, n);
}
bis.close();
bis = null;
gzos.close();
gzos = null;
if (!file2gz.delete()) {
addStatus(new WarnStatus("Could not delete [" + nameOfFile2gz + "].", this));
}
} catch (Exception e) {
addStatus(new ErrorStatus("Error occurred while compressing [" + nameOfFile2gz + "] into [" + nameOfgzedFile + "].", this, e));
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
// ignore
}
}
if (gzos != null) {
try {
gzos.close();
} catch (IOException e) {
// ignore
}
}
}
}
static public String computeFileNameStrWithoutCompSuffix(String fileNamePatternStr, CompressionMode compressionMode) {
int len = fileNamePatternStr.length();
switch (compressionMode) {
case GZ:
if (fileNamePatternStr.endsWith(".gz"))
return fileNamePatternStr.substring(0, len - 3);
else
return fileNamePatternStr;
case ZIP:
if (fileNamePatternStr.endsWith(".zip"))
return fileNamePatternStr.substring(0, len - 4);
else
return fileNamePatternStr;
case NONE:
return fileNamePatternStr;
}
throw new IllegalStateException("Execution should not reach this point");
}
void createMissingTargetDirsIfNecessary(File file) {
boolean result = FileUtil.createMissingParentDirectories(file);
if (!result) {
addError("Failed to create parent directories for [" + file.getAbsolutePath() + "]");
}
}
@Override
public String toString() {
return this.getClass().getName();
}
public Future asyncCompress(String nameOfFile2Compress, String nameOfCompressedFile, String innerEntryName) throws RolloverFailure {
CompressionRunnable runnable = new CompressionRunnable(nameOfFile2Compress, nameOfCompressedFile, innerEntryName);
ExecutorService executorService = context.getScheduledExecutorService();
Future future = executorService.submit(runnable);
return future;
}
class CompressionRunnable implements Runnable {
final String nameOfFile2Compress;
final String nameOfCompressedFile;
final String innerEntryName;
public CompressionRunnable(String nameOfFile2Compress, String nameOfCompressedFile, String innerEntryName) {
this.nameOfFile2Compress = nameOfFile2Compress;
this.nameOfCompressedFile = nameOfCompressedFile;
this.innerEntryName = innerEntryName;
}
public void run() {
Compressor.this.compress(nameOfFile2Compress, nameOfCompressedFile, innerEntryName);
}
}
}