| /* |
| * Copyright (C) 2015 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.pm; |
| |
| import android.app.IInstantAppResolver; |
| import android.app.InstantAppResolverService; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.ServiceConnection; |
| import android.content.pm.InstantAppResolveInfo; |
| import android.os.Binder; |
| import android.os.Build; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.IBinder.DeathRecipient; |
| import android.os.IRemoteCallback; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.Slog; |
| import android.util.TimedRemoteCaller; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * Represents a remote instant app resolver. It is responsible for binding to the remote |
| * service and handling all interactions in a timely manner. |
| * @hide |
| */ |
| final class InstantAppResolverConnection implements DeathRecipient { |
| private static final String TAG = "PackageManager"; |
| // This is running in a critical section and the timeout must be sufficiently low |
| private static final long BIND_SERVICE_TIMEOUT_MS = |
| Build.IS_ENG ? 500 : 300; |
| private static final long CALL_SERVICE_TIMEOUT_MS = |
| Build.IS_ENG ? 200 : 100; |
| private static final boolean DEBUG_INSTANT = Build.IS_DEBUGGABLE; |
| |
| private final Object mLock = new Object(); |
| private final GetInstantAppResolveInfoCaller mGetInstantAppResolveInfoCaller = |
| new GetInstantAppResolveInfoCaller(); |
| private final ServiceConnection mServiceConnection = new MyServiceConnection(); |
| private final Context mContext; |
| /** Intent used to bind to the service */ |
| private final Intent mIntent; |
| |
| private static final int STATE_IDLE = 0; // no bind operation is ongoing |
| private static final int STATE_BINDING = 1; // someone is binding and waiting |
| private static final int STATE_PENDING = 2; // a bind is pending, but the caller is not waiting |
| |
| @GuardedBy("mLock") |
| private int mBindState = STATE_IDLE; |
| @GuardedBy("mLock") |
| private IInstantAppResolver mRemoteInstance; |
| |
| public InstantAppResolverConnection( |
| Context context, ComponentName componentName, String action) { |
| mContext = context; |
| mIntent = new Intent(action).setComponent(componentName); |
| } |
| |
| public final List<InstantAppResolveInfo> getInstantAppResolveInfoList(Intent sanitizedIntent, |
| int hashPrefix[], String token) throws ConnectionException { |
| throwIfCalledOnMainThread(); |
| IInstantAppResolver target = null; |
| try { |
| try { |
| target = getRemoteInstanceLazy(token); |
| } catch (TimeoutException e) { |
| throw new ConnectionException(ConnectionException.FAILURE_BIND); |
| } catch (InterruptedException e) { |
| throw new ConnectionException(ConnectionException.FAILURE_INTERRUPTED); |
| } |
| try { |
| return mGetInstantAppResolveInfoCaller |
| .getInstantAppResolveInfoList(target, sanitizedIntent, hashPrefix, token); |
| } catch (TimeoutException e) { |
| throw new ConnectionException(ConnectionException.FAILURE_CALL); |
| } catch (RemoteException ignore) { |
| } |
| } finally { |
| synchronized (mLock) { |
| mLock.notifyAll(); |
| } |
| } |
| return null; |
| } |
| |
| public final void getInstantAppIntentFilterList(Intent sanitizedIntent, int hashPrefix[], |
| String token, PhaseTwoCallback callback, Handler callbackHandler, final long startTime) |
| throws ConnectionException { |
| final IRemoteCallback remoteCallback = new IRemoteCallback.Stub() { |
| @Override |
| public void sendResult(Bundle data) throws RemoteException { |
| final ArrayList<InstantAppResolveInfo> resolveList = |
| data.getParcelableArrayList( |
| InstantAppResolverService.EXTRA_RESOLVE_INFO); |
| callbackHandler.post(() -> callback.onPhaseTwoResolved(resolveList, startTime)); |
| } |
| }; |
| try { |
| getRemoteInstanceLazy(token) |
| .getInstantAppIntentFilterList(sanitizedIntent, hashPrefix, token, |
| remoteCallback); |
| } catch (TimeoutException e) { |
| throw new ConnectionException(ConnectionException.FAILURE_BIND); |
| } catch (InterruptedException e) { |
| throw new ConnectionException(ConnectionException.FAILURE_INTERRUPTED); |
| } catch (RemoteException ignore) { |
| } |
| } |
| |
| private IInstantAppResolver getRemoteInstanceLazy(String token) |
| throws ConnectionException, TimeoutException, InterruptedException { |
| long binderToken = Binder.clearCallingIdentity(); |
| try { |
| return bind(token); |
| } finally { |
| Binder.restoreCallingIdentity(binderToken); |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void waitForBindLocked(String token) throws TimeoutException, InterruptedException { |
| final long startMillis = SystemClock.uptimeMillis(); |
| while (mBindState != STATE_IDLE) { |
| if (mRemoteInstance != null) { |
| break; |
| } |
| final long elapsedMillis = SystemClock.uptimeMillis() - startMillis; |
| final long remainingMillis = BIND_SERVICE_TIMEOUT_MS - elapsedMillis; |
| if (remainingMillis <= 0) { |
| throw new TimeoutException("[" + token + "] Didn't bind to resolver in time!"); |
| } |
| mLock.wait(remainingMillis); |
| } |
| } |
| |
| private IInstantAppResolver bind(String token) |
| throws ConnectionException, TimeoutException, InterruptedException { |
| boolean doUnbind = false; |
| synchronized (mLock) { |
| if (mRemoteInstance != null) { |
| return mRemoteInstance; |
| } |
| |
| if (mBindState == STATE_PENDING) { |
| // there is a pending bind, let's see if we can use it. |
| if (DEBUG_INSTANT) { |
| Slog.i(TAG, "[" + token + "] Previous bind timed out; waiting for connection"); |
| } |
| try { |
| waitForBindLocked(token); |
| if (mRemoteInstance != null) { |
| return mRemoteInstance; |
| } |
| } catch (TimeoutException e) { |
| // nope, we might have to try a rebind. |
| doUnbind = true; |
| } |
| } |
| |
| if (mBindState == STATE_BINDING) { |
| // someone was binding when we called bind(), or they raced ahead while we were |
| // waiting in the PENDING case; wait for their result instead. Last chance! |
| if (DEBUG_INSTANT) { |
| Slog.i(TAG, "[" + token + "] Another thread is binding; waiting for connection"); |
| } |
| waitForBindLocked(token); |
| // if the other thread's bindService() returned false, we could still have null. |
| if (mRemoteInstance != null) { |
| return mRemoteInstance; |
| } |
| throw new ConnectionException(ConnectionException.FAILURE_BIND); |
| } |
| mBindState = STATE_BINDING; // our time to shine! :) |
| } |
| |
| // only one thread can be here at a time (the one that set STATE_BINDING) |
| boolean wasBound = false; |
| IInstantAppResolver instance = null; |
| try { |
| if (doUnbind) { |
| if (DEBUG_INSTANT) { |
| Slog.i(TAG, "[" + token + "] Previous connection never established; rebinding"); |
| } |
| mContext.unbindService(mServiceConnection); |
| } |
| if (DEBUG_INSTANT) { |
| Slog.v(TAG, "[" + token + "] Binding to instant app resolver"); |
| } |
| final int flags = Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE; |
| wasBound = mContext |
| .bindServiceAsUser(mIntent, mServiceConnection, flags, UserHandle.SYSTEM); |
| if (wasBound) { |
| synchronized (mLock) { |
| waitForBindLocked(token); |
| instance = mRemoteInstance; |
| return instance; |
| } |
| } else { |
| Slog.w(TAG, "[" + token + "] Failed to bind to: " + mIntent); |
| throw new ConnectionException(ConnectionException.FAILURE_BIND); |
| } |
| } finally { |
| synchronized (mLock) { |
| if (wasBound && instance == null) { |
| mBindState = STATE_PENDING; |
| } else { |
| mBindState = STATE_IDLE; |
| } |
| mLock.notifyAll(); |
| } |
| } |
| } |
| |
| private void throwIfCalledOnMainThread() { |
| if (Thread.currentThread() == mContext.getMainLooper().getThread()) { |
| throw new RuntimeException("Cannot invoke on the main thread"); |
| } |
| } |
| |
| @Override |
| public void binderDied() { |
| if (DEBUG_INSTANT) { |
| Slog.d(TAG, "Binder to instant app resolver died"); |
| } |
| synchronized (mLock) { |
| handleBinderDiedLocked(); |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void handleBinderDiedLocked() { |
| if (mRemoteInstance != null) { |
| try { |
| mRemoteInstance.asBinder().unlinkToDeath(this, 0 /*flags*/); |
| } catch (NoSuchElementException ignore) { } |
| } |
| mRemoteInstance = null; |
| } |
| |
| /** |
| * Asynchronous callback when results come back from ephemeral resolution phase two. |
| */ |
| public abstract static class PhaseTwoCallback { |
| abstract void onPhaseTwoResolved( |
| List<InstantAppResolveInfo> instantAppResolveInfoList, long startTime); |
| } |
| |
| public static class ConnectionException extends Exception { |
| public static final int FAILURE_BIND = 1; |
| public static final int FAILURE_CALL = 2; |
| public static final int FAILURE_INTERRUPTED = 3; |
| |
| public final int failure; |
| public ConnectionException(int _failure) { |
| failure = _failure; |
| } |
| } |
| |
| private final class MyServiceConnection implements ServiceConnection { |
| @Override |
| public void onServiceConnected(ComponentName name, IBinder service) { |
| if (DEBUG_INSTANT) { |
| Slog.d(TAG, "Connected to instant app resolver"); |
| } |
| synchronized (mLock) { |
| mRemoteInstance = IInstantAppResolver.Stub.asInterface(service); |
| if (mBindState == STATE_PENDING) { |
| mBindState = STATE_IDLE; |
| } |
| try { |
| service.linkToDeath(InstantAppResolverConnection.this, 0 /*flags*/); |
| } catch (RemoteException e) { |
| handleBinderDiedLocked(); |
| } |
| mLock.notifyAll(); |
| } |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName name) { |
| if (DEBUG_INSTANT) { |
| Slog.d(TAG, "Disconnected from instant app resolver"); |
| } |
| synchronized (mLock) { |
| handleBinderDiedLocked(); |
| } |
| } |
| } |
| |
| private static final class GetInstantAppResolveInfoCaller |
| extends TimedRemoteCaller<List<InstantAppResolveInfo>> { |
| private final IRemoteCallback mCallback; |
| |
| public GetInstantAppResolveInfoCaller() { |
| super(CALL_SERVICE_TIMEOUT_MS); |
| mCallback = new IRemoteCallback.Stub() { |
| @Override |
| public void sendResult(Bundle data) throws RemoteException { |
| final ArrayList<InstantAppResolveInfo> resolveList = |
| data.getParcelableArrayList( |
| InstantAppResolverService.EXTRA_RESOLVE_INFO); |
| int sequence = |
| data.getInt(InstantAppResolverService.EXTRA_SEQUENCE, -1); |
| onRemoteMethodResult(resolveList, sequence); |
| } |
| }; |
| } |
| |
| public List<InstantAppResolveInfo> getInstantAppResolveInfoList( |
| IInstantAppResolver target, Intent sanitizedIntent, int hashPrefix[], String token) |
| throws RemoteException, TimeoutException { |
| final int sequence = onBeforeRemoteCall(); |
| target.getInstantAppResolveInfoList(sanitizedIntent, hashPrefix, token, sequence, |
| mCallback); |
| return getResultTimed(sequence); |
| } |
| } |
| } |