1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.providers.tv;
18
19import android.content.BroadcastReceiver;
20import android.content.ComponentName;
21import android.content.Context;
22import android.content.Intent;
23import android.content.SharedPreferences;
24import android.content.pm.PackageManager;
25import android.os.RemoteException;
26import android.util.EventLog;
27import android.util.Log;
28
29import com.android.providers.tv.TvProvider.DatabaseHelper;
30
31/**
32 * This will be launched during system boot, after the core system has
33 * been brought up but before any non-persistent processes have been
34 * started.  It is launched in a special state, with no content provider
35 * or custom application class associated with the process running.
36 *
37 * Its job is to prime the tv provider database. Either create it
38 * if it doesn't exist, or open it and force any necessary upgrades.
39 * All of this heavy lifting happens before the boot animation ends.
40 */
41public class TvProviderUpgradeReceiver extends BroadcastReceiver {
42    static final String TAG = "TvProviderUpgradeReceiver";
43    static final String PREF_DB_VERSION = "db_version";
44
45    @Override
46    public void onReceive(Context context, Intent intent) {
47        // We are now running with the system up, but no apps started,
48        // so can do whatever cleanup after an upgrade that we want.
49
50        try {
51            long startTime = System.currentTimeMillis();
52
53            // Lookup the last known database version
54            SharedPreferences prefs = context.getSharedPreferences(TAG, Context.MODE_PRIVATE);
55            int prefVersion = prefs.getInt(PREF_DB_VERSION, 0);
56
57            // If the version is old go ahead and attempt to create or upgrade the database.
58            if (prefVersion != TvProvider.DATABASE_VERSION) {
59                // Store the current version so this receiver isn't run again until the database
60                // version number changes. This is intentionally done even before the upgrade path
61                // is attempted to be conservative. If the upgrade fails for some reason and we
62                // crash and burn we don't want to get into a loop doing so.
63                prefs.edit().putInt(PREF_DB_VERSION, TvProvider.DATABASE_VERSION).commit();
64
65                // Ask for a reference to the database to force the helper to either
66                // create the database or open it up, performing any necessary upgrades
67                // in the process.
68                DatabaseHelper helper = DatabaseHelper.getInstance(context);
69                if (context.getDatabasePath(helper.getDatabaseName()).exists()) {
70                    Log.i(TAG, "Creating or opening tv provider database");
71                    helper.getWritableDatabase();
72                }
73            }
74        } catch (Throwable t) {
75            // Something has gone terribly wrong. Disable this receiver for good so we can't
76            // possibly end up in a reboot loop.
77            Log.wtf(TAG, "Error during upgrade attempt. Disabling receiver.", t);
78            context.getPackageManager().setComponentEnabledSetting(
79                    new ComponentName(context, getClass()),
80                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
81                    PackageManager.DONT_KILL_APP);
82        }
83    }
84}
85