1 files changed, 135 insertions, 0 deletions
diff --git a/src/com/android/providers/downloads/DownloadIdleService.java b/src/com/android/providers/downloads/DownloadIdleService.java
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+++ b/src/com/android/providers/downloads/DownloadIdleService.java
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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.maintenance.IdleService;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.database.Cursor;
+import android.os.Environment;
+import android.provider.Downloads;
+import android.text.TextUtils;
+import android.util.Slog;
+
+import com.android.providers.downloads.StorageUtils.ConcreteFile;
+import com.google.android.collect.Lists;
+import com.google.android.collect.Sets;
+
+import libcore.io.ErrnoException;
+import libcore.io.IoUtils;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashSet;
+
+/**
+ * Idle maintenance 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 IdleService {
+
+    private final Runnable mIdleRunnable = new Runnable() {
+        @Override
+        public void run() {
+            cleanOrphans();
+            finishIdle();
+        }
+    };
+
+    @Override
+    public boolean onIdleStart() {
+        new Thread(mIdleRunnable).start();
+        return true;
+    }
+
+    @Override
+    public void onIdleStop() {
+        // We're okay being killed at any point, so we don't worry about
+        // checkpointing before tearing down.
+    }
+
+    private interface DownloadQuery {
+        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,
+                DownloadQuery.PROJECTION, null, null, null);
+        try {
+            while (cursor.moveToNext()) {
+                final String path = cursor.getString(DownloadQuery._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(DownloadQuery._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();
+            }
+        }
+    }
+}