// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.data;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Date;
import java.util.Deque;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.regex.Pattern;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.actions.OpenFileAction.OpenFileTask;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.event.AbstractDatasetChangedEvent;
import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter;
import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter.Listener;
import org.openstreetmap.josm.data.preferences.BooleanProperty;
import org.openstreetmap.josm.data.preferences.IntegerProperty;
import org.openstreetmap.josm.gui.MapView;
import org.openstreetmap.josm.gui.MapView.LayerChangeListener;
import org.openstreetmap.josm.gui.Notification;
import org.openstreetmap.josm.gui.layer.Layer;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.io.OsmExporter;
import org.openstreetmap.josm.io.OsmImporter;
/**
* Saves data layers periodically so they can be recovered in case of a crash.
*
* There are 2 directories
* - autosave dir: copies of the currently open data layers are saved here every
* PROP_INTERVAL seconds. When a data layer is closed normally, the corresponding
* files are removed. If this dir is non-empty on start, JOSM assumes
* that it crashed last time.
* - deleted layers dir: "secondary archive" - when autosaved layers are restored
* they are copied to this directory. We cannot keep them in the autosave folder,
* but just deleting it would be dangerous: Maybe a feature inside the file
* caused JOSM to crash. If the data is valuable, the user can still try to
* open with another versions of JOSM or fix the problem manually.
*
* The deleted layers dir keeps at most PROP_DELETED_LAYERS files.
*/
public class AutosaveTask extends TimerTask implements LayerChangeListener, Listener {
private static final char[] ILLEGAL_CHARACTERS = { '/', '\n', '\r', '\t', '\0', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':' };
private static final String AUTOSAVE_DIR = "autosave";
private static final String DELETED_LAYERS_DIR = "autosave/deleted_layers";
public static final BooleanProperty PROP_AUTOSAVE_ENABLED = new BooleanProperty("autosave.enabled", true);
public static final IntegerProperty PROP_FILES_PER_LAYER = new IntegerProperty("autosave.filesPerLayer", 1);
public static final IntegerProperty PROP_DELETED_LAYERS = new IntegerProperty("autosave.deletedLayersBackupCount", 5);
public static final IntegerProperty PROP_INTERVAL = new IntegerProperty("autosave.interval", 5 * 60);
public static final IntegerProperty PROP_INDEX_LIMIT = new IntegerProperty("autosave.index-limit", 1000);
/** Defines if a notification should be displayed after each autosave */
public static final BooleanProperty PROP_NOTIFICATION = new BooleanProperty("autosave.notification", false);
private static class AutosaveLayerInfo {
OsmDataLayer layer;
String layerName;
String layerFileName;
final Deque<File> backupFiles = new LinkedList<>();
}
private final DataSetListenerAdapter datasetAdapter = new DataSetListenerAdapter(this);
private final Set<DataSet> changedDatasets = new HashSet<>();
private final List<AutosaveLayerInfo> layersInfo = new ArrayList<>();
private Timer timer;
private final Object layersLock = new Object();
private final Deque<File> deletedLayers = new LinkedList<>();
private final File autosaveDir = new File(Main.pref.getPreferencesDir() + AUTOSAVE_DIR);
private final File deletedLayersDir = new File(Main.pref.getPreferencesDir() + DELETED_LAYERS_DIR);
public void schedule() {
if (PROP_INTERVAL.get() > 0) {
if (!autosaveDir.exists() && !autosaveDir.mkdirs()) {
Main.warn(tr("Unable to create directory {0}, autosave will be disabled", autosaveDir.getAbsolutePath()));
return;
}
if (!deletedLayersDir.exists() && !deletedLayersDir.mkdirs()) {
Main.warn(tr("Unable to create directory {0}, autosave will be disabled", deletedLayersDir.getAbsolutePath()));
return;
}
for (File f: deletedLayersDir.listFiles()) {
deletedLayers.add(f); // FIXME: sort by mtime
}
timer = new Timer(true);
timer.schedule(this, 1000, PROP_INTERVAL.get() * 1000);
MapView.addLayerChangeListener(this);
if (Main.isDisplayingMapView()) {
for (OsmDataLayer l: Main.map.mapView.getLayersOfType(OsmDataLayer.class)) {
registerNewlayer(l);
}
}
}
}
private String getFileName(String layerName, int index) {
String result = layerName;
for (char illegalCharacter : ILLEGAL_CHARACTERS) {
result = result.replaceAll(Pattern.quote(String.valueOf(illegalCharacter)),
'&' + String.valueOf((int) illegalCharacter) + ';');
}
if (index != 0) {
result = result + '_' + index;
}
return result;
}
private void setLayerFileName(AutosaveLayerInfo layer) {
int index = 0;
while (true) {
String filename = getFileName(layer.layer.getName(), index);
boolean foundTheSame = false;
for (AutosaveLayerInfo info: layersInfo) {
if (info != layer && filename.equals(info.layerFileName)) {
foundTheSame = true;
break;
}
}
if (!foundTheSame) {
layer.layerFileName = filename;
return;
}
index++;
}
}
private File getNewLayerFile(AutosaveLayerInfo layer) {
int index = 0;
Date now = new Date();
while (true) {
String filename = String.format("%1$s_%2$tY%2$tm%2$td_%2$tH%2$tM%3$s", layer.layerFileName, now, index == 0?"":"_" + index);
File result = new File(autosaveDir, filename+".osm");
try {
if (result.createNewFile()) {
File pidFile = new File(autosaveDir, filename+".pid");
try (PrintStream ps = new PrintStream(pidFile, "UTF-8")) {
ps.println(ManagementFactory.getRuntimeMXBean().getName());
} catch (Throwable t) {
Main.error(t);
}
return result;
} else {
Main.warn(tr("Unable to create file {0}, other filename will be used", result.getAbsolutePath()));
if (index > PROP_INDEX_LIMIT.get())
throw new IOException("index limit exceeded");
}
} catch (IOException e) {
Main.error(tr("IOError while creating file, autosave will be skipped: {0}", e.getMessage()));
return null;
}
index++;
}
}
private void savelayer(AutosaveLayerInfo info) {
if (!info.layer.getName().equals(info.layerName)) {
setLayerFileName(info);
info.layerName = info.layer.getName();
}
if (changedDatasets.remove(info.layer.data)) {
File file = getNewLayerFile(info);
if (file != null) {
info.backupFiles.add(file);
new OsmExporter().exportData(file, info.layer, true /* no backup with appended ~ */);
}
}
while (info.backupFiles.size() > PROP_FILES_PER_LAYER.get()) {
File oldFile = info.backupFiles.remove();
if (!oldFile.delete()) {
Main.warn(tr("Unable to delete old backup file {0}", oldFile.getAbsolutePath()));
} else {
getPidFile(oldFile).delete();
}
}
}
@Override
public void run() {
synchronized (layersLock) {
try {
for (AutosaveLayerInfo info: layersInfo) {
savelayer(info);
}
changedDatasets.clear();
if (PROP_NOTIFICATION.get() && !layersInfo.isEmpty()) {
displayNotification();
}
} catch (Throwable t) {
// Don't let exception stop time thread
Main.error("Autosave failed:");
Main.error(t);
}
}
}
protected void displayNotification() {
GuiHelper.runInEDT(new Runnable() {
@Override
public void run() {
new Notification(tr("Your work has been saved automatically."))
.setDuration(Notification.TIME_SHORT)
.show();
}
});
}
@Override
public void activeLayerChange(Layer oldLayer, Layer newLayer) {
// Do nothing
}
private void registerNewlayer(OsmDataLayer layer) {
synchronized (layersLock) {
layer.data.addDataSetListener(datasetAdapter);
AutosaveLayerInfo info = new AutosaveLayerInfo();
info.layer = layer;
layersInfo.add(info);
}
}
@Override
public void layerAdded(Layer newLayer) {
if (newLayer instanceof OsmDataLayer) {
registerNewlayer((OsmDataLayer) newLayer);
}
}
@Override
public void layerRemoved(Layer oldLayer) {
if (oldLayer instanceof OsmDataLayer) {
synchronized (layersLock) {
OsmDataLayer osmLayer = (OsmDataLayer) oldLayer;
osmLayer.data.removeDataSetListener(datasetAdapter);
Iterator<AutosaveLayerInfo> it = layersInfo.iterator();
while (it.hasNext()) {
AutosaveLayerInfo info = it.next();
if (info.layer == osmLayer) {
savelayer(info);
File lastFile = info.backupFiles.pollLast();
if (lastFile != null) {
moveToDeletedLayersFolder(lastFile);
}
for (File file: info.backupFiles) {
if (file.delete()) {
getPidFile(file).delete();
}
}
it.remove();
}
}
}
}
}
@Override
public void processDatasetEvent(AbstractDatasetChangedEvent event) {
changedDatasets.add(event.getDataset());
}
private final File getPidFile(File osmFile) {
return new File(autosaveDir, osmFile.getName().replaceFirst("[.][^.]+$", ".pid"));
}
/**
* Replies the list of .osm files still present in autosave dir, that are not currently managed by another instance of JOSM.
* These files are hence unsaved layers from an old instance of JOSM that crashed and may be recovered by this instance.
* @return The list of .osm files still present in autosave dir, that are not currently managed by another instance of JOSM
*/
public List<File> getUnsavedLayersFiles() {
List<File> result = new ArrayList<>();
File[] files = autosaveDir.listFiles(OsmImporter.FILE_FILTER);
if (files == null)
return result;
for (File file: files) {
if (file.isFile()) {
boolean skipFile = false;
File pidFile = getPidFile(file);
if (pidFile.exists()) {
try (BufferedReader reader = Files.newBufferedReader(pidFile.toPath(), StandardCharsets.UTF_8)) {
String jvmId = reader.readLine();
if (jvmId != null) {
String pid = jvmId.split("@")[0];
skipFile = jvmPerfDataFileExists(pid);
}
} catch (Throwable t) {
Main.error(t);
}
}
if (!skipFile) {
result.add(file);
}
}
}
return result;
}
private boolean jvmPerfDataFileExists(final String jvmId) {
File jvmDir = new File(System.getProperty("java.io.tmpdir") + File.separator + "hsperfdata_" + System.getProperty("user.name"));
if (jvmDir.exists() && jvmDir.canRead()) {
File[] files = jvmDir.listFiles(new FileFilter() {
@Override
public boolean accept(File file) {
return file.getName().equals(jvmId) && file.isFile();
}
});
return files != null && files.length == 1;
}
return false;
}
public void recoverUnsavedLayers() {
List<File> files = getUnsavedLayersFiles();
final OpenFileTask openFileTsk = new OpenFileTask(files, null, tr("Restoring files"));
Main.worker.submit(openFileTsk);
Main.worker.submit(new Runnable() {
@Override
public void run() {
for (File f: openFileTsk.getSuccessfullyOpenedFiles()) {
moveToDeletedLayersFolder(f);
}
}
});
}
/**
* Move file to the deleted layers directory.
* If moving does not work, it will try to delete the file directly.
* Afterwards, if the number of deleted layers gets larger than PROP_DELETED_LAYERS,
* some files in the deleted layers directory will be removed.
*
* @param f the file, usually from the autosave dir
*/
private void moveToDeletedLayersFolder(File f) {
File backupFile = new File(deletedLayersDir, f.getName());
File pidFile = getPidFile(f);
if (backupFile.exists()) {
deletedLayers.remove(backupFile);
if (!backupFile.delete()) {
Main.warn(String.format("Could not delete old backup file %s", backupFile));
}
}
if (f.renameTo(backupFile)) {
deletedLayers.add(backupFile);
pidFile.delete();
} else {
Main.warn(String.format("Could not move autosaved file %s to %s folder", f.getName(), deletedLayersDir.getName()));
// we cannot move to deleted folder, so just try to delete it directly
if (!f.delete()) {
Main.warn(String.format("Could not delete backup file %s", f));
} else {
pidFile.delete();
}
}
while (deletedLayers.size() > PROP_DELETED_LAYERS.get()) {
File next = deletedLayers.remove();
if (next == null) {
break;
}
if (!next.delete()) {
Main.warn(String.format("Could not delete archived backup file %s", next));
}
}
}
public void discardUnsavedLayers() {
for (File f: getUnsavedLayersFiles()) {
moveToDeletedLayersFolder(f);
}
}
}