Reconnect to DAService after binding is dead (09c529a9) · Commits · e / os / android_frameworks_base

core/java/android/provider/Settings.java

+17 −0

Original line number	Diff line number	Diff line
		@@ -9221,6 +9221,23 @@ public final class Settings {
		*/
		public static final String SHORTCUT_MANAGER_CONSTANTS = "shortcut_manager_constants";

		/**
		* DevicePolicyManager specific settings.
		* This is encoded as a key=value list, separated by commas. Ex:
		*
		* <pre>
		* das_died_service_reconnect_backoff_sec (long)
		* das_died_service_reconnect_backoff_increase (float)
		* das_died_service_reconnect_max_backoff_sec (long)
		* </pre>
		*
		* <p>
		* Type: string
		* @hide
		* see also com.android.server.devicepolicy.DevicePolicyConstants
		*/
		public static final String DEVICE_POLICY_CONSTANTS = "device_policy_constants";

		/**
		* Get the key that retrieves a bluetooth headset's priority.
		* @hide

services/core/java/com/android/server/am/PersistentConnection.java

+231 −25

Original line number	Diff line number	Diff line
		@@ -22,32 +22,77 @@ import android.content.Intent;
		import android.content.ServiceConnection;
		import android.os.Handler;
		import android.os.IBinder;
		import android.os.SystemClock;
		import android.os.UserHandle;
		import android.util.Slog;
		import android.util.TimeUtils;

		import com.android.internal.annotations.GuardedBy;
		import com.android.internal.annotations.VisibleForTesting;

		import java.io.PrintWriter;

		/**
		* Connects to a given service component on a given user.
		*
		* - Call {@link #connect()} to create a connection.
		* - Call {@link #disconnect()} to disconnect. Make sure to disconnect when the user stops.
		* - Call {@link #bind()} to create a connection.
		* - Call {@link #unbind()} to disconnect. Make sure to disconnect when the user stops.
		*
		* Add onConnected/onDisconnected callbacks as needed.
		*
		* When the target process gets killed (by OOM-killer, etc), then the activity manager will
		* re-connect the connection automatically, in which case onServiceDisconnected() gets called
		* and then onServiceConnected().
		*
		* However sometimes the activity manager just "kills" the connection -- like when the target
		* package gets updated or the target process crashes multiple times in a row, in which case
		* onBindingDied() gets called. This class handles this case by re-connecting in the time
		* {@link #mRebindBackoffMs}. If this happens again, this class increases the back-off time
		* by {@link #mRebindBackoffIncrease} and retry. The back-off time is capped at
		* {@link #mRebindMaxBackoffMs}.
		*
		* The back-off time will never be reset until {@link #unbind()} and {@link #bind()} are called
		* explicitly.
		*
		* NOTE: This class does not handle package-updates -- i.e. even if the binding dies due to
		* the target package being updated, this class won't reconnect. This is because this class doesn't
		* know what to do when the service component has gone missing, for example. If the user of this
		* class wants to restore the connection, then it should call {@link #unbind()} and {@link #bind}
		* explicitly.
		*/
		public abstract class PersistentConnection<T> {
		private final Object mLock = new Object();

		private final static boolean DEBUG = false;

		private final String mTag;
		private final Context mContext;
		private final Handler mHandler;
		private final int mUserId;
		private final ComponentName mComponentName;

		private long mNextBackoffMs;

		private final long mRebindBackoffMs;
		private final double mRebindBackoffIncrease;
		private final long mRebindMaxBackoffMs;

		private long mReconnectTime;

		// TODO too many booleans... Should clean up.

		@GuardedBy("mLock")
		private boolean mStarted;
		private boolean mBound;

		/**
		* Whether {@link #bind()} has been called and {@link #unbind()} hasn't been yet; meaning this
		* is the expected bind state from the caller's point of view.
		*/
		@GuardedBy("mLock")
		private boolean mShouldBeBound;

		@GuardedBy("mLock")
		private boolean mRebindScheduled;

		@GuardedBy("mLock")
		private boolean mIsConnected;
		@@ -59,6 +104,14 @@ public abstract class PersistentConnection<T> {
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
		synchronized (mLock) {
		if (!mBound) {
		// Callback came in after PersistentConnection.unbind() was called.
		// We just ignore this.
		// (We've already called unbindService() already in unbind)
		Slog.w(mTag, "Connected: " + mComponentName.flattenToShortString()
		+ " u" + mUserId + " but not bound, ignore.");
		return;
		}
		Slog.i(mTag, "Connected: " + mComponentName.flattenToShortString()
		+ " u" + mUserId);

		@@ -76,21 +129,68 @@ public abstract class PersistentConnection<T> {
		cleanUpConnectionLocked();
		}
		}

		@Override
		public void onBindingDied(ComponentName name) {
		// Activity manager gave up; we'll schedule a re-connect by ourselves.
		synchronized (mLock) {
		if (!mBound) {
		// Callback came in late?
		Slog.w(mTag, "Binding died: " + mComponentName.flattenToShortString()
		+ " u" + mUserId + " but not bound, ignore.");
		return;
		}

		Slog.w(mTag, "Binding died: " + mComponentName.flattenToShortString()
		+ " u" + mUserId);
		scheduleRebindLocked();
		}
		}
		};

		private final Runnable mBindForBackoffRunnable = () -> bindForBackoff();

		public PersistentConnection(@NonNull String tag, @NonNull Context context,
		@NonNull Handler handler, int userId, @NonNull ComponentName componentName) {
		@NonNull Handler handler, int userId, @NonNull ComponentName componentName,
		long rebindBackoffSeconds, double rebindBackoffIncrease, long rebindMaxBackoffSeconds) {
		mTag = tag;
		mContext = context;
		mHandler = handler;
		mUserId = userId;
		mComponentName = componentName;

		mRebindBackoffMs = rebindBackoffSeconds * 1000;
		mRebindBackoffIncrease = rebindBackoffIncrease;
		mRebindMaxBackoffMs = rebindMaxBackoffSeconds * 1000;

		mNextBackoffMs = mRebindBackoffMs;
		}

		public final ComponentName getComponentName() {
		return mComponentName;
		}

		/**
		* @return whether {@link #bind()} has been called and {@link #unbind()} hasn't.
		*
		* Note when the AM gives up on connection, this class detects it and un-bind automatically,
		* and schedule rebind, and {@link #isBound} returns false when it's waiting for a retry.
		*/
		public final boolean isBound() {
		synchronized (mLock) {
		return mBound;
		}
		}

		/**
		* @return whether re-bind is scheduled after the AM gives up on a connection.
		*/
		public final boolean isRebindScheduled() {
		synchronized (mLock) {
		return mRebindScheduled;
		}
		}

		/**
		* @return whether connected.
		*/
		@@ -112,15 +212,33 @@ public abstract class PersistentConnection<T> {
		/**
		* Connects to the service.
		*/
		public final void connect() {
		public final void bind() {
		synchronized (mLock) {
		if (mStarted) {
		mShouldBeBound = true;

		bindInnerLocked(/* resetBackoff= */ true);
		}
		}

		public final void bindInnerLocked(boolean resetBackoff) {
		unscheduleRebindLocked();

		if (mBound) {
		return;
		}
		mStarted = true;
		mBound = true;

		if (resetBackoff) {
		// Note this is the only place we reset the backoff time.
		mNextBackoffMs = mRebindBackoffMs;
		}

		final Intent service = new Intent().setComponent(mComponentName);

		if (DEBUG) {
		Slog.d(mTag, "Attempting to connect to " + mComponentName);
		}

		final boolean success = mContext.bindServiceAsUser(service, mServiceConnection,
		Context.BIND_AUTO_CREATE \| Context.BIND_FOREGROUND_SERVICE,
		mHandler, UserHandle.of(mUserId));
		@@ -130,6 +248,16 @@ public abstract class PersistentConnection<T> {
		+ " failed.");
		}
		}

		final void bindForBackoff() {
		synchronized (mLock) {
		if (!mShouldBeBound) {
		// Race condition -- by the time we got here, unbind() has already been called.
		return;
		}

		bindInnerLocked(/* resetBackoff= */ false);
		}
		}

		private void cleanUpConnectionLocked() {
		@@ -140,17 +268,47 @@ public abstract class PersistentConnection<T> {
		/**
		* Disconnect from the service.
		*/
		public final void disconnect() {
		public final void unbind() {
		synchronized (mLock) {
		if (!mStarted) {
		mShouldBeBound = false;

		unbindLocked();
		}
		}

		private final void unbindLocked() {
		unscheduleRebindLocked();

		if (!mBound) {
		return;
		}
		Slog.i(mTag, "Stopping: " + mComponentName.flattenToShortString() + " u" + mUserId);
		mStarted = false;
		mBound = false;
		mContext.unbindService(mServiceConnection);

		cleanUpConnectionLocked();
		}

		void unscheduleRebindLocked() {
		injectRemoveCallbacks(mBindForBackoffRunnable);
		mRebindScheduled = false;
		}

		void scheduleRebindLocked() {
		unbindLocked();

		if (!mRebindScheduled) {
		Slog.i(mTag, "Scheduling to reconnect in " + mNextBackoffMs + " ms (uptime)");

		mReconnectTime = injectUptimeMillis() + mNextBackoffMs;

		injectPostAtTime(mBindForBackoffRunnable, mReconnectTime);

		mNextBackoffMs = Math.min(mRebindMaxBackoffMs,
		(long) (mNextBackoffMs * mRebindBackoffIncrease));

		mRebindScheduled = true;
		}
		}

		/** Must be implemented by a subclass to convert an {@link IBinder} to a stub. */
		@@ -160,9 +318,57 @@ public abstract class PersistentConnection<T> {
		synchronized (mLock) {
		pw.print(prefix);
		pw.print(mComponentName.flattenToShortString());
		pw.print(mStarted ? " [started]" : " [not started]");
		pw.print(mBound ? " [bound]" : " [not bound]");
		pw.print(mIsConnected ? " [connected]" : " [not connected]");
		if (mRebindScheduled) {
		pw.print(" reconnect in ");
		TimeUtils.formatDuration((mReconnectTime - injectUptimeMillis()), pw);
		}
		pw.println();

		pw.print(prefix);
		pw.print(" Next backoff(sec): ");
		pw.print(mNextBackoffMs / 1000);
		}
		}

		@VisibleForTesting
		void injectRemoveCallbacks(Runnable r) {
		mHandler.removeCallbacks(r);
		}

		@VisibleForTesting
		void injectPostAtTime(Runnable r, long uptimeMillis) {
		mHandler.postAtTime(r, uptimeMillis);
		}

		@VisibleForTesting
		long injectUptimeMillis() {
		return SystemClock.uptimeMillis();
		}

		@VisibleForTesting
		long getNextBackoffMsForTest() {
		return mNextBackoffMs;
		}

		@VisibleForTesting
		long getReconnectTimeForTest() {
		return mReconnectTime;
		}

		@VisibleForTesting
		ServiceConnection getServiceConnectionForTest() {
		return mServiceConnection;
		}

		@VisibleForTesting
		Runnable getBindForBackoffRunnableForTest() {
		return mBindForBackoffRunnable;
		}

		@VisibleForTesting
		boolean shouldBeBoundForTest() {
		return mShouldBeBound;
		}
		}

services/devicepolicy/java/com/android/server/devicepolicy/DeviceAdminServiceController.java

+16 −7

Original line number	Diff line number	Diff line
		@@ -53,6 +53,7 @@ public class DeviceAdminServiceController {

		private final DevicePolicyManagerService mService;
		private final DevicePolicyManagerService.Injector mInjector;
		private final DevicePolicyConstants mConstants;

		private final Handler mHandler; // needed?

		@@ -66,7 +67,10 @@ public class DeviceAdminServiceController {
		private class DevicePolicyServiceConnection
		extends PersistentConnection<IDeviceAdminService> {
		public DevicePolicyServiceConnection(int userId, @NonNull ComponentName componentName) {
		super(TAG, mContext, mHandler, userId, componentName);
		super(TAG, mContext, mHandler, userId, componentName,
		mConstants.DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC,
		mConstants.DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE,
		mConstants.DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC);
		}

		@Override
		@@ -81,11 +85,13 @@ public class DeviceAdminServiceController {
		@GuardedBy("mLock")
		private final SparseArray<DevicePolicyServiceConnection> mConnections = new SparseArray<>();

		public DeviceAdminServiceController(DevicePolicyManagerService service) {
		public DeviceAdminServiceController(DevicePolicyManagerService service,
		DevicePolicyConstants constants) {
		mService = service;
		mInjector = service.mInjector;
		mContext = mInjector.mContext;
		mHandler = new Handler(BackgroundThread.get().getLooper());
		mConstants = constants;
		}

		/**
		@@ -150,9 +156,11 @@ public class DeviceAdminServiceController {
		final PersistentConnection<IDeviceAdminService> existing =
		mConnections.get(userId);
		if (existing != null) {
		if (existing.getComponentName().equals(service.getComponentName())) {
		return;
		}
		// Note even when we're already connected to the same service, the binding
		// would have died at this point due to a package update. So we disconnect
		// anyway and re-connect.
		debug("Disconnecting from existing service connection.",
		packageName, userId);
		disconnectServiceOnUserLocked(userId, actionForLog);
		}

		@@ -164,7 +172,7 @@ public class DeviceAdminServiceController {
		new DevicePolicyServiceConnection(
		userId, service.getComponentName());
		mConnections.put(userId, conn);
		conn.connect();
		conn.bind();
		}
		} finally {
		mInjector.binderRestoreCallingIdentity(token);
		@@ -190,7 +198,7 @@ public class DeviceAdminServiceController {
		if (conn != null) {
		debug("Stopping service for u%d if already running for %s.",
		userId, actionForLog);
		conn.disconnect();
		conn.unbind();
		mConnections.remove(userId);
		}
		}
		@@ -209,6 +217,7 @@ public class DeviceAdminServiceController {
		final DevicePolicyServiceConnection con = mConnections.valueAt(i);
		con.dump(prefix + " ", pw);
		}
		pw.println();
		}
		}
		}

services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyConstants.java

0 → 100644

+115 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2017 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.server.devicepolicy;

		import android.util.KeyValueListParser;
		import android.util.Slog;

		import java.io.PrintWriter;
		import java.util.concurrent.TimeUnit;

		/**
		* Constants that are configurable via the global settings for {@link DevicePolicyManagerService}.
		*
		* Example of setting the values for testing.
		* adb shell settings put global device_policy_constants das_died_service_reconnect_backoff_sec=10,das_died_service_reconnect_backoff_increase=1.5,das_died_service_reconnect_max_backoff_sec=30
		*/
		public class DevicePolicyConstants {
		private static final String TAG = DevicePolicyManagerService.LOG_TAG;

		private static final String DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC_KEY
		= "das_died_service_reconnect_backoff_sec";

		private static final String DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE_KEY
		= "das_died_service_reconnect_backoff_increase";

		private static final String DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC_KEY
		= "das_died_service_reconnect_max_backoff_sec";

		/**
		* The back-off before re-connecting, when a service binding died, due to the owner
		* crashing repeatedly.
		*/
		public final long DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC;

		/**
		* The exponential back-off increase factor when a binding dies multiple times.
		*/
		public final double DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE;

		/**
		* The max back-off
		*/
		public final long DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC;

		private DevicePolicyConstants(String settings) {

		final KeyValueListParser parser = new KeyValueListParser(',');
		try {
		parser.setString(settings);
		} catch (IllegalArgumentException e) {
		// Failed to parse the settings string, log this and move on
		// with defaults.
		Slog.e(TAG, "Bad device policy settings: " + settings);
		}

		long dasDiedServiceReconnectBackoffSec = parser.getLong(
		DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC_KEY, TimeUnit.HOURS.toSeconds(1));

		double dasDiedServiceReconnectBackoffIncrease = parser.getFloat(
		DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE_KEY, 2f);

		long dasDiedServiceReconnectMaxBackoffSec = parser.getLong(
		DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC_KEY, TimeUnit.DAYS.toSeconds(1));

		// Set minimum: 5 seconds.
		dasDiedServiceReconnectBackoffSec = Math.max(5, dasDiedServiceReconnectBackoffSec);

		// Set minimum: 1.0.
		dasDiedServiceReconnectBackoffIncrease =
		Math.max(1, dasDiedServiceReconnectBackoffIncrease);

		// Make sure max >= default back off.
		dasDiedServiceReconnectMaxBackoffSec = Math.max(dasDiedServiceReconnectBackoffSec,
		dasDiedServiceReconnectMaxBackoffSec);

		DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC = dasDiedServiceReconnectBackoffSec;
		DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE = dasDiedServiceReconnectBackoffIncrease;
		DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC = dasDiedServiceReconnectMaxBackoffSec;

		}

		public static DevicePolicyConstants loadFromString(String settings) {
		return new DevicePolicyConstants(settings);
		}

		public void dump(String prefix, PrintWriter pw) {
		pw.print(prefix);
		pw.println("Constants:");

		pw.print(prefix);
		pw.print(" DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC: ");
		pw.println( DAS_DIED_SERVICE_RECONNECT_BACKOFF_SEC);

		pw.print(prefix);
		pw.print(" DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE: ");
		pw.println( DAS_DIED_SERVICE_RECONNECT_BACKOFF_INCREASE);

		pw.print(prefix);
		pw.print(" DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC: ");
		pw.println( DAS_DIED_SERVICE_RECONNECT_MAX_BACKOFF_SEC);
		}
		}

services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java

+18 −3

Original line number	Diff line number	Diff line
		@@ -141,6 +141,7 @@ import android.os.storage.StorageManager;
		import android.provider.ContactsContract.QuickContact;
		import android.provider.ContactsInternal;
		import android.provider.Settings;
		import android.provider.Settings.Global;
		import android.security.IKeyChainAliasCallback;
		import android.security.IKeyChainService;
		import android.security.KeyChain;
		@@ -364,6 +365,7 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
		final UserManagerInternal mUserManagerInternal;
		final TelephonyManager mTelephonyManager;
		private final LockPatternUtils mLockPatternUtils;
		private final DevicePolicyConstants mConstants;
		private final DeviceAdminServiceController mDeviceAdminServiceController;

		/**
		@@ -1447,7 +1449,10 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {

		private void handlePackagesChanged(@Nullable String packageName, int userHandle) {
		boolean removedAdmin = false;
		if (VERBOSE_LOG) Slog.d(LOG_TAG, "Handling package changes for user " + userHandle);
		if (VERBOSE_LOG) {
		Slog.d(LOG_TAG, "Handling package changes package " + packageName
		+ " for user " + userHandle);
		}
		DevicePolicyData policy = getUserData(userHandle);
		synchronized (this) {
		for (int i = policy.mAdminList.size() - 1; i >= 0; i--) {
		@@ -1760,6 +1765,10 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
		return Settings.Global.getInt(mContext.getContentResolver(), name, def);
		}

		String settingsGlobalGetString(String name) {
		return Settings.Global.getString(mContext.getContentResolver(), name);
		}

		void settingsGlobalPutInt(String name, int value) {
		Settings.Global.putInt(mContext.getContentResolver(), name, value);
		}
		@@ -1801,6 +1810,9 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
		mInjector = injector;
		mContext = Preconditions.checkNotNull(injector.mContext);
		mHandler = new Handler(Preconditions.checkNotNull(injector.getMyLooper()));
		mConstants = DevicePolicyConstants.loadFromString(
		mInjector.settingsGlobalGetString(Global.DEVICE_POLICY_CONSTANTS));

		mOwners = Preconditions.checkNotNull(injector.newOwners());

		mUserManager = Preconditions.checkNotNull(injector.getUserManager());
		@@ -1823,7 +1835,7 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
		// Needed when mHasFeature == false, because it controls the certificate warning text.
		mCertificateMonitor = new CertificateMonitor(this, mInjector, mBackgroundHandler);

		mDeviceAdminServiceController = new DeviceAdminServiceController(this);
		mDeviceAdminServiceController = new DeviceAdminServiceController(this, mConstants);

		if (!mHasFeature) {
		// Skip the rest of the initialization
		@@ -7354,6 +7366,7 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {

		synchronized (this) {
		pw.println("Current Device Policy Manager state:");

		mOwners.dump(" ", pw);
		mDeviceAdminServiceController.dump(" ", pw);
		int userCount = mUserData.size();
		@@ -7380,6 +7393,8 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
		pw.print(" mPasswordOwner="); pw.println(policy.mPasswordOwner);
		}
		pw.println();
		mConstants.dump(" ", pw);
		pw.println();
		pw.println(" Encryption Status: " + getEncryptionStatusName(getEncryptionStatus()));
		}
		}