| /* |
| * Copyright (C) 2018 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.car; |
| |
| import android.car.drivingstate.CarDrivingStateEvent; |
| import android.car.drivingstate.ICarDrivingStateChangeListener; |
| import android.car.hardware.power.CarPowerManager; |
| import android.car.hardware.power.CarPowerManager.CarPowerStateListener; |
| import android.car.hardware.power.CarPowerManager.CarPowerStateListenerWithCompletion; |
| import android.car.userlib.CarUserManagerHelper; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.location.Location; |
| import android.location.LocationManager; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.AtomicFile; |
| import android.util.JsonReader; |
| import android.util.JsonWriter; |
| import android.util.Log; |
| |
| import com.android.car.systeminterface.SystemInterface; |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStreamWriter; |
| import java.io.PrintWriter; |
| import java.util.concurrent.CompletableFuture; |
| |
| /** |
| * This service stores the last known location from {@link LocationManager} when a car is parked |
| * and restores the location when the car is powered on. |
| */ |
| public class CarLocationService extends BroadcastReceiver implements CarServiceBase, |
| CarPowerStateListenerWithCompletion { |
| private static final String TAG = "CarLocationService"; |
| private static final String FILENAME = "location_cache.json"; |
| private static final boolean DBG = true; |
| // The accuracy for the stored timestamp |
| private static final long GRANULARITY_ONE_DAY_MS = 24 * 60 * 60 * 1000L; |
| // The time-to-live for the cached location |
| private static final long TTL_THIRTY_DAYS_MS = 30 * GRANULARITY_ONE_DAY_MS; |
| // The maximum number of times to try injecting a location |
| private static final int MAX_LOCATION_INJECTION_ATTEMPTS = 10; |
| |
| // Used internally for mHandlerThread synchronization |
| private final Object mLock = new Object(); |
| |
| private final Context mContext; |
| private final CarUserManagerHelper mCarUserManagerHelper; |
| private int mTaskCount = 0; |
| private HandlerThread mHandlerThread; |
| private Handler mHandler; |
| private CarPowerManager mCarPowerManager; |
| private CarDrivingStateService mCarDrivingStateService; |
| |
| public CarLocationService(Context context, CarUserManagerHelper carUserManagerHelper) { |
| logd("constructed"); |
| mContext = context; |
| mCarUserManagerHelper = carUserManagerHelper; |
| } |
| |
| @Override |
| public void init() { |
| logd("init"); |
| IntentFilter filter = new IntentFilter(); |
| filter.addAction(Intent.ACTION_USER_SWITCHED); |
| filter.addAction(LocationManager.MODE_CHANGED_ACTION); |
| filter.addAction(LocationManager.PROVIDERS_CHANGED_ACTION); |
| mContext.registerReceiver(this, filter); |
| mCarDrivingStateService = CarLocalServices.getService(CarDrivingStateService.class); |
| if (mCarDrivingStateService != null) { |
| CarDrivingStateEvent event = mCarDrivingStateService.getCurrentDrivingState(); |
| if (event != null && event.eventValue == CarDrivingStateEvent.DRIVING_STATE_MOVING) { |
| deleteCacheFile(); |
| } else { |
| mCarDrivingStateService.registerDrivingStateChangeListener( |
| mICarDrivingStateChangeEventListener); |
| } |
| } |
| mCarPowerManager = CarLocalServices.createCarPowerManager(mContext); |
| if (mCarPowerManager != null) { // null case happens for testing. |
| mCarPowerManager.setListenerWithCompletion(CarLocationService.this); |
| } |
| } |
| |
| @Override |
| public void release() { |
| logd("release"); |
| if (mCarPowerManager != null) { |
| mCarPowerManager.clearListener(); |
| } |
| if (mCarDrivingStateService != null) { |
| mCarDrivingStateService.unregisterDrivingStateChangeListener( |
| mICarDrivingStateChangeEventListener); |
| } |
| mContext.unregisterReceiver(this); |
| } |
| |
| @Override |
| public void dump(PrintWriter writer) { |
| writer.println(TAG); |
| writer.println("Context: " + mContext); |
| writer.println("MAX_LOCATION_INJECTION_ATTEMPTS: " + MAX_LOCATION_INJECTION_ATTEMPTS); |
| } |
| |
| @Override |
| public void onStateChanged(int state, CompletableFuture<Void> future) { |
| logd("onStateChanged: " + state); |
| switch (state) { |
| case CarPowerStateListener.SHUTDOWN_PREPARE: |
| asyncOperation(() -> { |
| storeLocation(); |
| // Notify the CarPowerManager that it may proceed to shutdown or suspend. |
| if (future != null) { |
| future.complete(null); |
| } |
| }); |
| break; |
| case CarPowerStateListener.SUSPEND_EXIT: |
| deleteCacheFile(); |
| if (future != null) { |
| future.complete(null); |
| } |
| default: |
| // This service does not need to do any work for these events but should still |
| // notify the CarPowerManager that it may proceed. |
| if (future != null) { |
| future.complete(null); |
| } |
| break; |
| } |
| } |
| |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| logd("onReceive " + intent); |
| String action = intent.getAction(); |
| if (action == Intent.ACTION_USER_SWITCHED) { |
| int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, -1); |
| logd("USER_SWITCHED: " + userHandle); |
| if (mCarUserManagerHelper.isHeadlessSystemUser() |
| && userHandle > UserHandle.USER_SYSTEM) { |
| asyncOperation(() -> loadLocation()); |
| } |
| } else if (action == LocationManager.MODE_CHANGED_ACTION |
| && shouldCheckLocationPermissions()) { |
| LocationManager locationManager = |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| boolean locationEnabled = locationManager.isLocationEnabled(); |
| logd("isLocationEnabled(): " + locationEnabled); |
| if (!locationEnabled) { |
| deleteCacheFile(); |
| } |
| } else if (action == LocationManager.PROVIDERS_CHANGED_ACTION |
| && shouldCheckLocationPermissions()) { |
| LocationManager locationManager = |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| boolean gpsEnabled = |
| locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); |
| logd("isProviderEnabled('gps'): " + gpsEnabled); |
| if (!gpsEnabled) { |
| deleteCacheFile(); |
| } |
| } |
| } |
| |
| private final ICarDrivingStateChangeListener mICarDrivingStateChangeEventListener = |
| new ICarDrivingStateChangeListener.Stub() { |
| @Override |
| public void onDrivingStateChanged(CarDrivingStateEvent event) { |
| logd("onDrivingStateChanged " + event); |
| if (event != null |
| && event.eventValue == CarDrivingStateEvent.DRIVING_STATE_MOVING) { |
| deleteCacheFile(); |
| if (mCarDrivingStateService != null) { |
| mCarDrivingStateService.unregisterDrivingStateChangeListener( |
| mICarDrivingStateChangeEventListener); |
| } |
| } |
| } |
| }; |
| |
| /** |
| * Tells whether or not we should check location permissions for the sake of deleting the |
| * location cache file when permissions are lacking. If the system user is headless but the |
| * current user is still the system user, then we should not respond to a lack of location |
| * permissions. |
| */ |
| private boolean shouldCheckLocationPermissions() { |
| return !(mCarUserManagerHelper.isHeadlessSystemUser() |
| && mCarUserManagerHelper.isCurrentProcessSystemUser()); |
| } |
| |
| /** |
| * Gets the last known location from the LocationManager and store it in a file. |
| */ |
| private void storeLocation() { |
| LocationManager locationManager = |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); |
| if (location == null) { |
| logd("Not storing null location"); |
| } else { |
| logd("Storing location: " + location); |
| AtomicFile atomicFile = new AtomicFile(getLocationCacheFile()); |
| FileOutputStream fos = null; |
| try { |
| fos = atomicFile.startWrite(); |
| try (JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(fos, "UTF-8"))) { |
| jsonWriter.beginObject(); |
| jsonWriter.name("provider").value(location.getProvider()); |
| jsonWriter.name("latitude").value(location.getLatitude()); |
| jsonWriter.name("longitude").value(location.getLongitude()); |
| if (location.hasAltitude()) { |
| jsonWriter.name("altitude").value(location.getAltitude()); |
| } |
| if (location.hasSpeed()) { |
| jsonWriter.name("speed").value(location.getSpeed()); |
| } |
| if (location.hasBearing()) { |
| jsonWriter.name("bearing").value(location.getBearing()); |
| } |
| if (location.hasAccuracy()) { |
| jsonWriter.name("accuracy").value(location.getAccuracy()); |
| } |
| if (location.hasVerticalAccuracy()) { |
| jsonWriter.name("verticalAccuracy").value( |
| location.getVerticalAccuracyMeters()); |
| } |
| if (location.hasSpeedAccuracy()) { |
| jsonWriter.name("speedAccuracy").value( |
| location.getSpeedAccuracyMetersPerSecond()); |
| } |
| if (location.hasBearingAccuracy()) { |
| jsonWriter.name("bearingAccuracy").value( |
| location.getBearingAccuracyDegrees()); |
| } |
| if (location.isFromMockProvider()) { |
| jsonWriter.name("isFromMockProvider").value(true); |
| } |
| long currentTime = location.getTime(); |
| // Round the time down to only be accurate within one day. |
| jsonWriter.name("captureTime").value( |
| currentTime - currentTime % GRANULARITY_ONE_DAY_MS); |
| jsonWriter.endObject(); |
| } |
| atomicFile.finishWrite(fos); |
| } catch (IOException e) { |
| Log.e(TAG, "Unable to write to disk", e); |
| atomicFile.failWrite(fos); |
| } |
| } |
| } |
| |
| /** |
| * Reads a previously stored location and attempts to inject it into the LocationManager. |
| */ |
| private void loadLocation() { |
| Location location = readLocationFromCacheFile(); |
| logd("Read location from timestamp " + location.getTime()); |
| long currentTime = System.currentTimeMillis(); |
| if (location.getTime() + TTL_THIRTY_DAYS_MS < currentTime) { |
| logd("Location expired."); |
| deleteCacheFile(); |
| } else { |
| location.setTime(currentTime); |
| long elapsedTime = SystemClock.elapsedRealtimeNanos(); |
| location.setElapsedRealtimeNanos(elapsedTime); |
| if (location.isComplete()) { |
| injectLocation(location, 1); |
| } |
| } |
| } |
| |
| private Location readLocationFromCacheFile() { |
| Location location = new Location((String) null); |
| AtomicFile atomicFile = new AtomicFile(getLocationCacheFile()); |
| try (FileInputStream fis = atomicFile.openRead()) { |
| JsonReader reader = new JsonReader(new InputStreamReader(fis, "UTF-8")); |
| reader.beginObject(); |
| while (reader.hasNext()) { |
| String name = reader.nextName(); |
| if (name.equals("provider")) { |
| location.setProvider(reader.nextString()); |
| } else if (name.equals("latitude")) { |
| location.setLatitude(reader.nextDouble()); |
| } else if (name.equals("longitude")) { |
| location.setLongitude(reader.nextDouble()); |
| } else if (name.equals("altitude")) { |
| location.setAltitude(reader.nextDouble()); |
| } else if (name.equals("speed")) { |
| location.setSpeed((float) reader.nextDouble()); |
| } else if (name.equals("bearing")) { |
| location.setBearing((float) reader.nextDouble()); |
| } else if (name.equals("accuracy")) { |
| location.setAccuracy((float) reader.nextDouble()); |
| } else if (name.equals("verticalAccuracy")) { |
| location.setVerticalAccuracyMeters((float) reader.nextDouble()); |
| } else if (name.equals("speedAccuracy")) { |
| location.setSpeedAccuracyMetersPerSecond((float) reader.nextDouble()); |
| } else if (name.equals("bearingAccuracy")) { |
| location.setBearingAccuracyDegrees((float) reader.nextDouble()); |
| } else if (name.equals("isFromMockProvider")) { |
| location.setIsFromMockProvider(reader.nextBoolean()); |
| } else if (name.equals("captureTime")) { |
| location.setTime(reader.nextLong()); |
| } else { |
| reader.skipValue(); |
| } |
| } |
| reader.endObject(); |
| } catch (FileNotFoundException e) { |
| Log.d(TAG, "Location cache file not found."); |
| } catch (IOException e) { |
| Log.e(TAG, "Unable to read from disk", e); |
| } catch (NumberFormatException | IllegalStateException e) { |
| Log.e(TAG, "Unexpected format", e); |
| } |
| return location; |
| } |
| |
| private void deleteCacheFile() { |
| boolean deleted = getLocationCacheFile().delete(); |
| logd("Deleted cache file: " + deleted); |
| } |
| |
| /** |
| * Attempts to inject the location multiple times in case the LocationManager was not fully |
| * initialized or has not updated its handle to the current user yet. |
| */ |
| private void injectLocation(Location location, int attemptCount) { |
| LocationManager locationManager = |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| boolean success = locationManager.injectLocation(location); |
| logd("Injected location " + location + " with result " + success + " on attempt " |
| + attemptCount); |
| if (success) { |
| return; |
| } else if (attemptCount <= MAX_LOCATION_INJECTION_ATTEMPTS) { |
| asyncOperation(() -> { |
| injectLocation(location, attemptCount + 1); |
| }, 200 * attemptCount); |
| } else { |
| logd("No location injected."); |
| } |
| } |
| |
| private File getLocationCacheFile() { |
| SystemInterface systemInterface = CarLocalServices.getService(SystemInterface.class); |
| File file = new File(systemInterface.getSystemCarDir(), FILENAME); |
| logd("File: " + file); |
| return file; |
| } |
| |
| @VisibleForTesting |
| void asyncOperation(Runnable operation) { |
| asyncOperation(operation, 0); |
| } |
| |
| private void asyncOperation(Runnable operation, long delayMillis) { |
| synchronized (mLock) { |
| // Create a new HandlerThread if this is the first task to queue. |
| if (++mTaskCount == 1) { |
| mHandlerThread = new HandlerThread("CarLocationServiceThread"); |
| mHandlerThread.start(); |
| mHandler = new Handler(mHandlerThread.getLooper()); |
| } |
| } |
| mHandler.postDelayed(() -> { |
| try { |
| operation.run(); |
| } finally { |
| synchronized (mLock) { |
| // Quit the thread when the task queue is empty. |
| if (--mTaskCount == 0) { |
| mHandler.getLooper().quit(); |
| mHandler = null; |
| mHandlerThread = null; |
| } |
| } |
| } |
| }, delayMillis); |
| } |
| |
| private static void logd(String msg) { |
| if (DBG) { |
| Log.d(TAG, msg); |
| } |
| } |
| } |