| /* |
| * 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.stats; |
| |
| import android.app.AlarmManager; |
| import android.app.PendingIntent; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.os.Binder; |
| import android.os.IBinder; |
| import android.os.IStatsCompanionService; |
| import android.os.IStatsManager; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.util.Slog; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.os.KernelWakelockReader; |
| import com.android.internal.os.KernelWakelockStats; |
| import com.android.server.SystemService; |
| |
| import java.util.Map; |
| |
| /** |
| * Helper service for statsd (the native stats management service in cmds/statsd/). |
| * Used for registering and receiving alarms on behalf of statsd. |
| * @hide |
| */ |
| public class StatsCompanionService extends IStatsCompanionService.Stub { |
| static final String TAG = "StatsCompanionService"; |
| static final boolean DEBUG = true; |
| |
| private final Context mContext; |
| private final AlarmManager mAlarmManager; |
| @GuardedBy("sStatsdLock") |
| private static IStatsManager sStatsd; |
| private static final Object sStatsdLock = new Object(); |
| |
| private final PendingIntent mAnomalyAlarmIntent; |
| private final PendingIntent mPollingAlarmIntent; |
| |
| public StatsCompanionService(Context context) { |
| super(); |
| mContext = context; |
| mAlarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE); |
| |
| mAnomalyAlarmIntent = PendingIntent.getBroadcast(mContext, 0, |
| new Intent(mContext, AnomalyAlarmReceiver.class), 0); |
| mPollingAlarmIntent = PendingIntent.getBroadcast(mContext, 0, |
| new Intent(mContext, PollingAlarmReceiver.class), 0); |
| } |
| |
| public final static class AnomalyAlarmReceiver extends BroadcastReceiver { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| Slog.i(TAG, "StatsCompanionService believes an anomaly has occurred."); |
| synchronized (sStatsdLock) { |
| if (sStatsd == null) { |
| Slog.w(TAG, "Could not access statsd to inform it of anomaly alarm firing"); |
| return; |
| } |
| try { |
| // Two-way call to statsd to retain AlarmManager wakelock |
| sStatsd.informAnomalyAlarmFired(); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "Failed to inform statsd of anomaly alarm firing", e); |
| } |
| } |
| // AlarmManager releases its own wakelock here. |
| } |
| }; |
| |
| public final static class PollingAlarmReceiver extends BroadcastReceiver { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (DEBUG) Slog.d(TAG, "Time to poll something."); |
| synchronized (sStatsdLock) { |
| if (sStatsd == null) { |
| Slog.w(TAG, "Could not access statsd to inform it of polling alarm firing"); |
| return; |
| } |
| try { |
| // Two-way call to statsd to retain AlarmManager wakelock |
| sStatsd.informPollAlarmFired(); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "Failed to inform statsd of polling alarm firing", e); |
| } |
| } |
| // AlarmManager releases its own wakelock here. |
| } |
| }; |
| |
| @Override // Binder call |
| public void setAnomalyAlarm(long timestampMs) { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "Setting anomaly alarm for " + timestampMs); |
| final long callingToken = Binder.clearCallingIdentity(); |
| try { |
| // using RTC, not RTC_WAKEUP, so if device is asleep, will only fire when it awakens. |
| // This alarm is inexact, leaving its exactness completely up to the OS optimizations. |
| // AlarmManager will automatically cancel any previous mAnomalyAlarmIntent alarm. |
| mAlarmManager.set(AlarmManager.RTC, timestampMs, mAnomalyAlarmIntent); |
| } finally { |
| Binder.restoreCallingIdentity(callingToken); |
| } |
| } |
| |
| @Override // Binder call |
| public void cancelAnomalyAlarm() { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "Cancelling anomaly alarm"); |
| final long callingToken = Binder.clearCallingIdentity(); |
| try { |
| mAlarmManager.cancel(mAnomalyAlarmIntent); |
| } finally { |
| Binder.restoreCallingIdentity(callingToken); |
| } |
| } |
| |
| @Override // Binder call |
| public void setPollingAlarms(long timestampMs, long intervalMs) { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "Setting polling alarm for " + timestampMs |
| + " every " + intervalMs + "ms"); |
| final long callingToken = Binder.clearCallingIdentity(); |
| try { |
| // using RTC, not RTC_WAKEUP, so if device is asleep, will only fire when it awakens. |
| // This alarm is inexact, leaving its exactness completely up to the OS optimizations. |
| // TODO: totally inexact means that stats per bucket could be quite off. Is this okay? |
| mAlarmManager.setRepeating(AlarmManager.RTC, timestampMs, intervalMs, |
| mPollingAlarmIntent); |
| } finally { |
| Binder.restoreCallingIdentity(callingToken); |
| } |
| } |
| |
| @Override // Binder call |
| public void cancelPollingAlarms() { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "Cancelling polling alarm"); |
| final long callingToken = Binder.clearCallingIdentity(); |
| try { |
| mAlarmManager.cancel(mPollingAlarmIntent); |
| } finally { |
| Binder.restoreCallingIdentity(callingToken); |
| } |
| } |
| |
| // These values must be kept in sync with cmd/statsd/StatsPullerManager.h. |
| // TODO: pull the constant from stats_events.proto instead |
| private static final int PULL_CODE_KERNEL_WAKELOCKS = 20; |
| |
| private final KernelWakelockReader mKernelWakelockReader = new KernelWakelockReader(); |
| private final KernelWakelockStats mTmpWakelockStats = new KernelWakelockStats(); |
| |
| @Override // Binder call |
| public String pullData(int pullCode) { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "Fetching " + pullCode); |
| |
| StringBuilder s = new StringBuilder(); // TODO: use and return a Parcel instead of a string |
| switch (pullCode) { |
| case PULL_CODE_KERNEL_WAKELOCKS: |
| final KernelWakelockStats wakelockStats = |
| mKernelWakelockReader.readKernelWakelockStats(mTmpWakelockStats); |
| |
| for (Map.Entry<String, KernelWakelockStats.Entry> ent : wakelockStats.entrySet()) { |
| String name = ent.getKey(); |
| KernelWakelockStats.Entry kws = ent.getValue(); |
| s.append("Wakelock ") |
| .append(name) |
| .append(", time=") |
| .append(kws.mTotalTime) |
| .append(", count=") |
| .append(kws.mCount) |
| .append('\n'); |
| } |
| break; |
| default: |
| Slog.w(TAG, "No such pollable data as " + pullCode); |
| return null; |
| } |
| return s.toString(); |
| } |
| |
| @Override // Binder call |
| public void statsdReady() { |
| enforceCallingPermission(); |
| if (DEBUG) Slog.d(TAG, "learned that statsdReady"); |
| sayHiToStatsd(); // tell statsd that we're ready too and link to it |
| } |
| |
| private void enforceCallingPermission() { |
| if (Binder.getCallingPid() == Process.myPid()) { |
| return; |
| } |
| mContext.enforceCallingPermission(android.Manifest.permission.STATSCOMPANION, null); |
| } |
| |
| // Lifecycle and related code |
| |
| /** Fetches the statsd IBinder service */ |
| private static IStatsManager fetchStatsdService() { |
| return IStatsManager.Stub.asInterface(ServiceManager.getService("stats")); |
| } |
| |
| public static final class Lifecycle extends SystemService { |
| private StatsCompanionService mStatsCompanionService; |
| |
| public Lifecycle(Context context) { |
| super(context); |
| } |
| |
| @Override |
| public void onStart() { |
| mStatsCompanionService = new StatsCompanionService(getContext()); |
| try { |
| publishBinderService(Context.STATS_COMPANION_SERVICE, mStatsCompanionService); |
| if (DEBUG) Slog.d(TAG, "Published " + Context.STATS_COMPANION_SERVICE); |
| } catch (Exception e) { |
| Slog.e(TAG, "Failed to publishBinderService", e); |
| } |
| } |
| |
| @Override |
| public void onBootPhase(int phase) { |
| super.onBootPhase(phase); |
| if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) { |
| mStatsCompanionService.systemReady(); |
| } |
| } |
| } |
| |
| /** Now that the android system is ready, StatsCompanion is ready too, so inform statsd. */ |
| private void systemReady() { |
| if (DEBUG) Slog.d(TAG, "Learned that systemReady"); |
| sayHiToStatsd(); |
| } |
| |
| /** Tells statsd that statscompanion is ready. If the binder call returns, link to statsd. */ |
| private void sayHiToStatsd() { |
| synchronized (sStatsdLock) { |
| if (sStatsd != null) { |
| Slog.e(TAG, "Trying to fetch statsd, but it was already fetched", |
| new IllegalStateException("sStatsd is not null when being fetched")); |
| return; |
| } |
| sStatsd = fetchStatsdService(); |
| if (sStatsd == null) { |
| Slog.w(TAG, "Could not access statsd"); |
| return; |
| } |
| if (DEBUG) Slog.d(TAG, "Saying hi to statsd"); |
| try { |
| sStatsd.statsCompanionReady(); |
| // If the statsCompanionReady two-way binder call returns, link to statsd. |
| try { |
| sStatsd.asBinder().linkToDeath(new StatsdDeathRecipient(), 0); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "linkToDeath(StatsdDeathRecipient) failed", e); |
| forgetEverything(); |
| } |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Failed to inform statsd that statscompanion is ready", e); |
| forgetEverything(); |
| } |
| } |
| } |
| |
| private class StatsdDeathRecipient implements IBinder.DeathRecipient { |
| @Override |
| public void binderDied() { |
| Slog.i(TAG, "Statsd is dead - erase all my knowledge."); |
| forgetEverything(); |
| } |
| } |
| |
| private void forgetEverything() { |
| synchronized (sStatsdLock) { |
| sStatsd = null; |
| cancelAnomalyAlarm(); |
| cancelPollingAlarms(); |
| } |
| } |
| |
| } |