service/src/com/android/car/CarLocationService.java - platform/packages/services/Car - Git at Google

 /*
  * 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.hardware.CarPropertyValue;
 import android.car.hardware.property.CarPropertyEvent;
 import android.car.hardware.property.ICarPropertyEventListener;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.hardware.automotive.vehicle.V2_0.VehicleIgnitionState;
 import android.hardware.automotive.vehicle.V2_0.VehicleProperty;
 import android.location.Location;
 import android.location.LocationManager;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.util.AtomicFile;
 import android.util.JsonReader;
 import android.util.JsonWriter;
 import android.util.Log;

 import com.android.internal.annotations.VisibleForTesting;

 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.List;

 /**
  * 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,
         CarPowerManagementService.PowerEventProcessingHandler {
     private static final String TAG = "CarLocationService";
     private static final String FILENAME = "location_cache.json";
     private static final boolean DBG = false;
     // 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;

     // Used internally for mHandlerThread synchronization
     private final Object mLock = new Object();

     private final Context mContext;
     private final CarPowerManagementService mCarPowerManagementService;
     private final CarPropertyService mCarPropertyService;
     private final CarPropertyEventListener mCarPropertyEventListener;
     private int mTaskCount = 0;
     private HandlerThread mHandlerThread;
     private Handler mHandler;

     public CarLocationService(Context context, CarPowerManagementService carPowerManagementService,
             CarPropertyService carPropertyService) {
         logd("constructed");
         mContext = context;
         mCarPowerManagementService = carPowerManagementService;
         mCarPropertyService = carPropertyService;
         mCarPropertyEventListener = new CarPropertyEventListener();
     }

     @Override
     public void init() {
         logd("init");
         IntentFilter filter = new IntentFilter();
         filter.addAction(Intent.ACTION_LOCKED_BOOT_COMPLETED);
         filter.addAction(LocationManager.MODE_CHANGED_ACTION);
         filter.addAction(LocationManager.GPS_ENABLED_CHANGE_ACTION);
         mContext.registerReceiver(this, filter);
         mCarPropertyService.registerListener(VehicleProperty.IGNITION_STATE, 0,
                 mCarPropertyEventListener);
         mCarPowerManagementService.registerPowerEventProcessingHandler(this);
     }

     @Override
     public void release() {
         logd("release");
         mCarPropertyService.unregisterListener(VehicleProperty.IGNITION_STATE,
                 mCarPropertyEventListener);
         mContext.unregisterReceiver(this);
     }

     @Override
     public void dump(PrintWriter writer) {
         writer.println(TAG);
         writer.println("Context: " + mContext);
         writer.println("CarPropertyService: " + mCarPropertyService);
     }

     @Override
     public long onPrepareShutdown(boolean shuttingDown) {
         logd("onPrepareShutdown " + shuttingDown);
         asyncOperation(() -> storeLocation());
         return 0;
     }

     @Override
     public void onPowerOn(boolean displayOn) { }

     @Override
     public int getWakeupTime() {
         return 0;
     }

     @Override
     public void onReceive(Context context, Intent intent) {
         logd("onReceive " + intent);
         String action = intent.getAction();
         if (action == Intent.ACTION_LOCKED_BOOT_COMPLETED) {
             asyncOperation(() -> loadLocation());
         } else {
             LocationManager locationManager =
                     (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
             if (action == LocationManager.MODE_CHANGED_ACTION) {
                 boolean locationEnabled = locationManager.isLocationEnabled();
                 logd("isLocationEnabled(): " + locationEnabled);
                 if (!locationEnabled) {
                     asyncOperation(() -> deleteCacheFile());
                 }
             } else if (action == LocationManager.GPS_ENABLED_CHANGE_ACTION) {
                 boolean gpsEnabled =
                         locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
                 logd("isProviderEnabled('gps'): " + gpsEnabled);
                 if (!gpsEnabled) {
                     asyncOperation(() -> deleteCacheFile());
                 }
             }
         }
     }

     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");
             deleteCacheFile();
         } else {
             logd("Storing location: " + location);
             AtomicFile atomicFile = new AtomicFile(mContext.getFileStreamPath(FILENAME));
             FileOutputStream fos = null;
             try {
                 fos = atomicFile.startWrite();
                 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();
                 jsonWriter.close();
                 atomicFile.finishWrite(fos);
             } catch (IOException e) {
                 Log.e(TAG, "Unable to write to disk", e);
                 atomicFile.failWrite(fos);
             }
         }
     }

     private void loadLocation() {
         Location location = readLocationFromCacheFile();
         logd("Read location from " + location.getTime());
         long currentTime = System.currentTimeMillis();
         if (location.getTime() + TTL_THIRTY_DAYS_MS < currentTime) {
             logd("Location expired.");
         } else {
             location.setTime(currentTime);
             long elapsedTime = SystemClock.elapsedRealtimeNanos();
             location.setElapsedRealtimeNanos(elapsedTime);
             if (location.isComplete()) {
                 LocationManager locationManager =
                         (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
                 boolean success = locationManager.injectLocation(location);
                 logd("Injected location " + location + " with result " + success);
             }
         }
     }

     private Location readLocationFromCacheFile() {
         Location location = new Location((String) null);
         AtomicFile atomicFile = new AtomicFile(mContext.getFileStreamPath(FILENAME));
         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();
             fis.close();
             deleteCacheFile();
         } 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() {
         logd("Deleting cache file");
         mContext.deleteFile(FILENAME);
     }

     @VisibleForTesting
     void asyncOperation(Runnable operation) {
         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.post(() -> {
             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;
                     }
                 }
             }
         });
     }

     private static void logd(String msg) {
         if (DBG) {
             Log.d(TAG, msg);
         }
     }

     private class CarPropertyEventListener extends ICarPropertyEventListener.Stub {
         @Override
         public void onEvent(List<CarPropertyEvent> events) throws RemoteException {
             for (CarPropertyEvent event : events) {
                 if (event.getEventType() == CarPropertyEvent.PROPERTY_EVENT_PROPERTY_CHANGE) {
                     CarPropertyValue value = event.getCarPropertyValue();
                     if (value.getPropertyId() == VehicleProperty.IGNITION_STATE) {
                         int ignitionState = (Integer) value.getValue();
                         logd("property ignition value: " + ignitionState);
                         if (ignitionState == VehicleIgnitionState.OFF) {
                             logd("ignition off");
                             asyncOperation(() -> storeLocation());
                         }
                     }
                 }
             }
         }
     }
 }
	/*
	* 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.hardware.CarPropertyValue;
	import android.car.hardware.property.CarPropertyEvent;
	import android.car.hardware.property.ICarPropertyEventListener;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.hardware.automotive.vehicle.V2_0.VehicleIgnitionState;
	import android.hardware.automotive.vehicle.V2_0.VehicleProperty;
	import android.location.Location;
	import android.location.LocationManager;
	import android.os.Handler;
	import android.os.HandlerThread;
	import android.os.RemoteException;
	import android.os.SystemClock;
	import android.util.AtomicFile;
	import android.util.JsonReader;
	import android.util.JsonWriter;
	import android.util.Log;

	import com.android.internal.annotations.VisibleForTesting;

	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.List;

	/**
	* 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,
	CarPowerManagementService.PowerEventProcessingHandler {
	private static final String TAG = "CarLocationService";
	private static final String FILENAME = "location_cache.json";
	private static final boolean DBG = false;
	// 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;

	// Used internally for mHandlerThread synchronization
	private final Object mLock = new Object();

	private final Context mContext;
	private final CarPowerManagementService mCarPowerManagementService;
	private final CarPropertyService mCarPropertyService;
	private final CarPropertyEventListener mCarPropertyEventListener;
	private int mTaskCount = 0;
	private HandlerThread mHandlerThread;
	private Handler mHandler;

	public CarLocationService(Context context, CarPowerManagementService carPowerManagementService,
	CarPropertyService carPropertyService) {
	logd("constructed");
	mContext = context;
	mCarPowerManagementService = carPowerManagementService;
	mCarPropertyService = carPropertyService;
	mCarPropertyEventListener = new CarPropertyEventListener();
	}

	@Override
	public void init() {
	logd("init");
	IntentFilter filter = new IntentFilter();
	filter.addAction(Intent.ACTION_LOCKED_BOOT_COMPLETED);
	filter.addAction(LocationManager.MODE_CHANGED_ACTION);
	filter.addAction(LocationManager.GPS_ENABLED_CHANGE_ACTION);
	mContext.registerReceiver(this, filter);
	mCarPropertyService.registerListener(VehicleProperty.IGNITION_STATE, 0,
	mCarPropertyEventListener);
	mCarPowerManagementService.registerPowerEventProcessingHandler(this);
	}

	@Override
	public void release() {
	logd("release");
	mCarPropertyService.unregisterListener(VehicleProperty.IGNITION_STATE,
	mCarPropertyEventListener);
	mContext.unregisterReceiver(this);
	}

	@Override
	public void dump(PrintWriter writer) {
	writer.println(TAG);
	writer.println("Context: " + mContext);
	writer.println("CarPropertyService: " + mCarPropertyService);
	}

	@Override
	public long onPrepareShutdown(boolean shuttingDown) {
	logd("onPrepareShutdown " + shuttingDown);
	asyncOperation(() -> storeLocation());
	return 0;
	}

	@Override
	public void onPowerOn(boolean displayOn) { }

	@Override
	public int getWakeupTime() {
	return 0;
	}

	@Override
	public void onReceive(Context context, Intent intent) {
	logd("onReceive " + intent);
	String action = intent.getAction();
	if (action == Intent.ACTION_LOCKED_BOOT_COMPLETED) {
	asyncOperation(() -> loadLocation());
	} else {
	LocationManager locationManager =
	(LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
	if (action == LocationManager.MODE_CHANGED_ACTION) {
	boolean locationEnabled = locationManager.isLocationEnabled();
	logd("isLocationEnabled(): " + locationEnabled);
	if (!locationEnabled) {
	asyncOperation(() -> deleteCacheFile());
	}
	} else if (action == LocationManager.GPS_ENABLED_CHANGE_ACTION) {
	boolean gpsEnabled =
	locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
	logd("isProviderEnabled('gps'): " + gpsEnabled);
	if (!gpsEnabled) {
	asyncOperation(() -> deleteCacheFile());
	}
	}
	}
	}

	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");
	deleteCacheFile();
	} else {
	logd("Storing location: " + location);
	AtomicFile atomicFile = new AtomicFile(mContext.getFileStreamPath(FILENAME));
	FileOutputStream fos = null;
	try {
	fos = atomicFile.startWrite();
	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();
	jsonWriter.close();
	atomicFile.finishWrite(fos);
	} catch (IOException e) {
	Log.e(TAG, "Unable to write to disk", e);
	atomicFile.failWrite(fos);
	}
	}
	}

	private void loadLocation() {
	Location location = readLocationFromCacheFile();
	logd("Read location from " + location.getTime());
	long currentTime = System.currentTimeMillis();
	if (location.getTime() + TTL_THIRTY_DAYS_MS < currentTime) {
	logd("Location expired.");
	} else {
	location.setTime(currentTime);
	long elapsedTime = SystemClock.elapsedRealtimeNanos();
	location.setElapsedRealtimeNanos(elapsedTime);
	if (location.isComplete()) {
	LocationManager locationManager =
	(LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
	boolean success = locationManager.injectLocation(location);
	logd("Injected location " + location + " with result " + success);
	}
	}
	}

	private Location readLocationFromCacheFile() {
	Location location = new Location((String) null);
	AtomicFile atomicFile = new AtomicFile(mContext.getFileStreamPath(FILENAME));
	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();
	fis.close();
	deleteCacheFile();
	} 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() {
	logd("Deleting cache file");
	mContext.deleteFile(FILENAME);
	}

	@VisibleForTesting
	void asyncOperation(Runnable operation) {
	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.post(() -> {
	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;
	}
	}
	}
	});
	}

	private static void logd(String msg) {
	if (DBG) {
	Log.d(TAG, msg);
	}
	}

	private class CarPropertyEventListener extends ICarPropertyEventListener.Stub {
	@Override
	public void onEvent(List<CarPropertyEvent> events) throws RemoteException {
	for (CarPropertyEvent event : events) {
	if (event.getEventType() == CarPropertyEvent.PROPERTY_EVENT_PROPERTY_CHANGE) {
	CarPropertyValue value = event.getCarPropertyValue();
	if (value.getPropertyId() == VehicleProperty.IGNITION_STATE) {
	int ignitionState = (Integer) value.getValue();
	logd("property ignition value: " + ignitionState);
	if (ignitionState == VehicleIgnitionState.OFF) {
	logd("ignition off");
	asyncOperation(() -> storeLocation());
	}
	}
	}
	}
	}
	}
	}