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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.providers.downloads;
import static com.android.providers.downloads.Constants.TAG;
import static com.android.providers.downloads.StorageUtils.listFilesRecursive;
import android.app.DownloadManager;
import android.app.job.JobInfo;
import android.app.job.JobParameters;
import android.app.job.JobScheduler;
import android.app.job.JobService;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.os.Environment;
import android.provider.Downloads;
import android.system.ErrnoException;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.util.Slog;
import com.android.providers.downloads.StorageUtils.ConcreteFile;
import libcore.io.IoUtils;
import com.google.android.collect.Lists;
import com.google.android.collect.Sets;
import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
/**
* Idle-time service for {@link DownloadManager}. Reconciles database
* metadata and files on disk, which can become inconsistent when files are
* deleted directly on disk.
*/
public class DownloadIdleService extends JobService {
private static final int IDLE_JOB_ID = -100;
private class IdleRunnable implements Runnable {
private JobParameters mParams;
public IdleRunnable(JobParameters params) {
mParams = params;
}
@Override
public void run() {
cleanStale();
cleanOrphans();
jobFinished(mParams, false);
}
}
@Override
public boolean onStartJob(JobParameters params) {
Helpers.getAsyncHandler().post(new IdleRunnable(params));
return true;
}
@Override
public boolean onStopJob(JobParameters params) {
// We're okay being killed at any point, so we don't worry about
// checkpointing before tearing down.
return false;
}
public static void scheduleIdlePass(Context context) {
final JobScheduler scheduler = context.getSystemService(JobScheduler.class);
if (scheduler.getPendingJob(IDLE_JOB_ID) == null) {
final JobInfo job = new JobInfo.Builder(IDLE_JOB_ID,
new ComponentName(context, DownloadIdleService.class))
.setPeriodic(12 * DateUtils.HOUR_IN_MILLIS)
.setRequiresCharging(true)
.setRequiresDeviceIdle(true)
.build();
scheduler.schedule(job);
}
}
private interface StaleQuery {
final String[] PROJECTION = new String[] {
Downloads.Impl._ID,
Downloads.Impl.COLUMN_STATUS,
Downloads.Impl.COLUMN_LAST_MODIFICATION,
Downloads.Impl.COLUMN_IS_VISIBLE_IN_DOWNLOADS_UI };
final int _ID = 0;
}
/**
* Remove stale downloads that third-party apps probably forgot about. We
* only consider non-visible downloads that haven't been touched in over a
* week.
*/
public void cleanStale() {
final ContentResolver resolver = getContentResolver();
final long modifiedBefore = System.currentTimeMillis() - DateUtils.WEEK_IN_MILLIS;
final Cursor cursor = resolver.query(Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI,
StaleQuery.PROJECTION, Downloads.Impl.COLUMN_STATUS + " >= '200' AND "
+ Downloads.Impl.COLUMN_LAST_MODIFICATION + " <= '" + modifiedBefore
+ "' AND " + Downloads.Impl.COLUMN_IS_VISIBLE_IN_DOWNLOADS_UI + " == '0'",
null, null);
int count = 0;
try {
while (cursor.moveToNext()) {
final long id = cursor.getLong(StaleQuery._ID);
resolver.delete(ContentUris.withAppendedId(
Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI, id), null, null);
count++;
}
} finally {
IoUtils.closeQuietly(cursor);
}
Slog.d(TAG, "Removed " + count + " stale downloads");
}
private interface OrphanQuery {
final String[] PROJECTION = new String[] {
Downloads.Impl._ID,
Downloads.Impl._DATA };
final int _ID = 0;
final int _DATA = 1;
}
/**
* Clean up orphan downloads, both in database and on disk.
*/
public void cleanOrphans() {
final ContentResolver resolver = getContentResolver();
// Collect known files from database
final HashSet<ConcreteFile> fromDb = Sets.newHashSet();
final Cursor cursor = resolver.query(Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI,
OrphanQuery.PROJECTION, null, null, null);
try {
while (cursor.moveToNext()) {
final String path = cursor.getString(OrphanQuery._DATA);
if (TextUtils.isEmpty(path)) continue;
final File file = new File(path);
try {
fromDb.add(new ConcreteFile(file));
} catch (ErrnoException e) {
// File probably no longer exists
final String state = Environment.getExternalStorageState(file);
if (Environment.MEDIA_UNKNOWN.equals(state)
|| Environment.MEDIA_MOUNTED.equals(state)) {
// File appears to live on internal storage, or a
// currently mounted device, so remove it from database.
// This logic preserves files on external storage while
// media is removed.
final long id = cursor.getLong(OrphanQuery._ID);
Slog.d(TAG, "Missing " + file + ", deleting " + id);
resolver.delete(ContentUris.withAppendedId(
Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI, id), null, null);
}
}
}
} finally {
IoUtils.closeQuietly(cursor);
}
// Collect known files from disk
final int uid = android.os.Process.myUid();
final ArrayList<ConcreteFile> fromDisk = Lists.newArrayList();
fromDisk.addAll(listFilesRecursive(getCacheDir(), null, uid));
fromDisk.addAll(listFilesRecursive(getFilesDir(), null, uid));
fromDisk.addAll(listFilesRecursive(Environment.getDownloadCacheDirectory(), null, uid));
Slog.d(TAG, "Found " + fromDb.size() + " files in database");
Slog.d(TAG, "Found " + fromDisk.size() + " files on disk");
// Delete files no longer referenced by database
for (ConcreteFile file : fromDisk) {
if (!fromDb.contains(file)) {
Slog.d(TAG, "Missing db entry, deleting " + file.file);
file.file.delete();
}
}
}
}
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