Lucas Dupin | 0a5d797 | 2019-01-16 18:52:30 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2019 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 | |
| 17 | package com.android.server.power; |
| 18 | |
| 19 | import android.attention.AttentionManagerInternal; |
| 20 | import android.attention.AttentionManagerInternal.AttentionCallbackInternal; |
| 21 | import android.content.Context; |
| 22 | import android.os.PowerManager; |
| 23 | import android.os.PowerManagerInternal; |
| 24 | import android.os.SystemClock; |
| 25 | import android.service.attention.AttentionService; |
| 26 | import android.util.Slog; |
| 27 | |
| 28 | import com.android.internal.annotations.VisibleForTesting; |
| 29 | import com.android.server.LocalServices; |
| 30 | |
| 31 | import java.io.PrintWriter; |
| 32 | |
| 33 | /** |
| 34 | * Class responsible for checking if the user is currently paying attention to the phone and |
| 35 | * notifying {@link PowerManagerService} that user activity should be renewed. |
| 36 | * |
| 37 | * This class also implements a limit of how long the extension should be, to avoid security |
| 38 | * issues where the device would never be locked. |
| 39 | */ |
| 40 | public class AttentionDetector { |
| 41 | |
| 42 | private static final String TAG = "AttentionDetector"; |
| 43 | private static final boolean DEBUG = false; |
| 44 | |
| 45 | /** |
| 46 | * Invoked whenever user attention is detected. |
| 47 | */ |
| 48 | private final Runnable mOnUserAttention; |
| 49 | |
| 50 | /** |
| 51 | * The maximum time, in millis, that the phone can stay unlocked because of attention events, |
| 52 | * triggered by any user. |
| 53 | */ |
| 54 | @VisibleForTesting |
| 55 | protected long mMaximumExtensionMillis; |
| 56 | |
| 57 | private final Object mLock; |
| 58 | |
| 59 | /** |
| 60 | * {@link android.service.attention.AttentionService} API timeout. |
| 61 | */ |
| 62 | private long mMaxAttentionApiTimeoutMillis; |
| 63 | |
| 64 | /** |
| 65 | * Last known user activity. |
| 66 | */ |
| 67 | private long mLastUserActivityTime; |
| 68 | |
| 69 | @VisibleForTesting |
| 70 | protected AttentionManagerInternal mAttentionManager; |
| 71 | |
| 72 | /** |
| 73 | * If we're currently waiting for an attention callback |
| 74 | */ |
| 75 | private boolean mRequested; |
| 76 | |
| 77 | /** |
| 78 | * Current wakefulness of the device. {@see PowerManagerInternal} |
| 79 | */ |
| 80 | private int mWakefulness; |
| 81 | |
| 82 | @VisibleForTesting |
| 83 | final AttentionCallbackInternal mCallback = new AttentionCallbackInternal() { |
| 84 | |
| 85 | @Override |
| 86 | public void onSuccess(int requestCode, int result, long timestamp) { |
| 87 | Slog.v(TAG, "onSuccess: " + requestCode + ", " + result |
| 88 | + " - current requestCode: " + getRequestCode()); |
| 89 | synchronized (mLock) { |
| 90 | if (requestCode == getRequestCode() && mRequested) { |
| 91 | mRequested = false; |
| 92 | if (mWakefulness != PowerManagerInternal.WAKEFULNESS_AWAKE) { |
| 93 | if (DEBUG) Slog.d(TAG, "Device slept before receiving callback."); |
| 94 | return; |
| 95 | } |
| 96 | if (result == AttentionService.ATTENTION_SUCCESS_PRESENT) { |
| 97 | mOnUserAttention.run(); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | @Override |
| 104 | public void onFailure(int requestCode, int error) { |
| 105 | Slog.i(TAG, "Failed to check attention: " + error); |
| 106 | synchronized (mLock) { |
| 107 | if (requestCode == getRequestCode()) { |
| 108 | mRequested = false; |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | }; |
| 113 | |
| 114 | public AttentionDetector(Runnable onUserAttention, Object lock) { |
| 115 | mOnUserAttention = onUserAttention; |
| 116 | mLock = lock; |
| 117 | } |
| 118 | |
| 119 | public void systemReady(Context context) { |
| 120 | mAttentionManager = LocalServices.getService(AttentionManagerInternal.class); |
| 121 | mMaximumExtensionMillis = context.getResources().getInteger( |
| 122 | com.android.internal.R.integer.config_attentionMaximumExtension); |
| 123 | mMaxAttentionApiTimeoutMillis = context.getResources().getInteger( |
| 124 | com.android.internal.R.integer.config_attentionApiTimeout); |
| 125 | } |
| 126 | |
| 127 | public long updateUserActivity(long nextScreenDimming) { |
| 128 | if (!isAttentionServiceSupported()) { |
| 129 | return nextScreenDimming; |
| 130 | } |
| 131 | |
| 132 | final long now = SystemClock.uptimeMillis(); |
| 133 | final long whenToCheck = nextScreenDimming - getAttentionTimeout(); |
| 134 | final long whenToStopExtending = mLastUserActivityTime + mMaximumExtensionMillis; |
| 135 | if (now < whenToCheck) { |
| 136 | if (DEBUG) { |
| 137 | Slog.d(TAG, "Do not check for attention yet, wait " + (whenToCheck - now)); |
| 138 | } |
| 139 | return nextScreenDimming; |
| 140 | } else if (whenToStopExtending < whenToCheck) { |
| 141 | if (DEBUG) { |
| 142 | Slog.d(TAG, "Let device sleep to avoid false results and improve security " |
| 143 | + (whenToCheck - whenToStopExtending)); |
| 144 | } |
| 145 | return nextScreenDimming; |
| 146 | } else if (mRequested) { |
| 147 | if (DEBUG) { |
| 148 | Slog.d(TAG, "Pending attention callback, wait. " + getRequestCode()); |
| 149 | } |
| 150 | return whenToCheck; |
| 151 | } |
| 152 | |
| 153 | // Ideally we should attribute mRequested to the result of #checkAttention, but the |
| 154 | // callback might arrive before #checkAttention returns (if there are cached results.) |
| 155 | // This means that we must assume that the request was successful, and then cancel it |
| 156 | // afterwards if AttentionManager couldn't deliver it. |
| 157 | mRequested = true; |
| 158 | final boolean sent = mAttentionManager.checkAttention(getRequestCode(), |
| 159 | getAttentionTimeout(), mCallback); |
| 160 | if (!sent) { |
| 161 | mRequested = false; |
| 162 | } |
| 163 | |
| 164 | Slog.v(TAG, "Checking user attention with request code: " + getRequestCode()); |
| 165 | return whenToCheck; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Handles user activity by cancelling any pending attention requests and keeping track of when |
| 170 | * the activity happened. |
| 171 | * |
| 172 | * @param eventTime Activity time, in uptime millis. |
| 173 | * @param event Activity type as defined in {@link PowerManager}. |
| 174 | * @return 0 when activity was ignored, 1 when handled, -1 when invalid. |
| 175 | */ |
| 176 | public int onUserActivity(long eventTime, int event) { |
| 177 | switch (event) { |
| 178 | case PowerManager.USER_ACTIVITY_EVENT_ATTENTION: |
| 179 | return 0; |
| 180 | case PowerManager.USER_ACTIVITY_EVENT_OTHER: |
| 181 | case PowerManager.USER_ACTIVITY_EVENT_BUTTON: |
| 182 | case PowerManager.USER_ACTIVITY_EVENT_TOUCH: |
| 183 | case PowerManager.USER_ACTIVITY_EVENT_ACCESSIBILITY: |
| 184 | cancelCurrentRequestIfAny(); |
| 185 | mLastUserActivityTime = eventTime; |
| 186 | return 1; |
| 187 | default: |
| 188 | if (DEBUG) { |
| 189 | Slog.d(TAG, "Attention not reset. Unknown activity event: " + event); |
| 190 | } |
| 191 | return -1; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | public void onWakefulnessChangeStarted(int wakefulness) { |
| 196 | mWakefulness = wakefulness; |
| 197 | if (wakefulness != PowerManagerInternal.WAKEFULNESS_AWAKE) { |
| 198 | cancelCurrentRequestIfAny(); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | private void cancelCurrentRequestIfAny() { |
| 203 | if (mRequested) { |
| 204 | mAttentionManager.cancelAttentionCheck(getRequestCode()); |
| 205 | mRequested = false; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | @VisibleForTesting |
| 210 | int getRequestCode() { |
| 211 | return (int) (mLastUserActivityTime % Integer.MAX_VALUE); |
| 212 | } |
| 213 | |
| 214 | @VisibleForTesting |
| 215 | long getAttentionTimeout() { |
| 216 | return mMaxAttentionApiTimeoutMillis; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * {@see AttentionManagerInternal#isAttentionServiceSupported} |
| 221 | */ |
| 222 | @VisibleForTesting |
| 223 | boolean isAttentionServiceSupported() { |
| 224 | return mAttentionManager.isAttentionServiceSupported(); |
| 225 | } |
| 226 | |
| 227 | public void dump(PrintWriter pw) { |
| 228 | pw.print("AttentionDetector:"); |
| 229 | pw.print(" mMaximumExtensionMillis=" + mMaximumExtensionMillis); |
| 230 | pw.print(" mMaxAttentionApiTimeoutMillis=" + mMaxAttentionApiTimeoutMillis); |
| 231 | pw.print(" mLastUserActivityTime(excludingAttention)=" + mLastUserActivityTime); |
| 232 | pw.print(" mAttentionServiceSupported=" + isAttentionServiceSupported()); |
| 233 | pw.print(" mRequested=" + mRequested); |
| 234 | } |
| 235 | } |