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Merge "Handle race conditions in SCS when statsd dies" into rvc-dev

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This commit is contained in:
Ruchir Rastogi
2020-05-06 22:10:42 +00:00
committed by Android (Google) Code Review
parent c9dad09ad3 e92edbaffc
commit 76994e73a7
2 changed files with 75 additions and 86 deletions
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159
apex/statsd/service/java/com/android/server/stats/StatsCompanionService.java
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@@ -54,11 +54,11 @@ import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Helper service for statsd (the native stats management service in cmds/statsd/).
@@ -112,17 +112,8 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
private final HashMap<Long, String> mDeletedFiles = new HashMap<>();
private final CompanionHandler mHandler;
// Flag that is set when PHASE_BOOT_COMPLETED is triggered in the StatsCompanion lifecycle. This
// and the flag mSentBootComplete below is used for synchronization to ensure that the boot
// complete signal is only ever sent once to statsd. Two signals are needed because
// #sayHiToStatsd can be called from both statsd and #onBootPhase
// PHASE_THIRD_PARTY_APPS_CAN_START.
@GuardedBy("sStatsdLock")
private boolean mBootCompleted = false;
// Flag that is set when IStatsd#bootCompleted is called. This flag ensures that boot complete
// signal is only ever sent once.
@GuardedBy("sStatsdLock")
private boolean mSentBootComplete = false;
// Flag that is set when PHASE_BOOT_COMPLETED is triggered in the StatsCompanion lifecycle.
private AtomicBoolean mBootCompleted = new AtomicBoolean(false);
public StatsCompanionService(Context context) {
super();
@@ -607,27 +598,35 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
// Statsd related code
/**
* Fetches the statsd IBinder service. This is a blocking call.
* Fetches the statsd IBinder service. This is a blocking call that always refetches statsd
* instead of returning the cached sStatsd.
* Note: This should only be called from {@link #sayHiToStatsd()}. All other clients should use
* the cached sStatsd via {@link #getStatsdNonblocking()}.
*/
private IStatsd fetchStatsdService(StatsdDeathRecipient deathRecipient) {
synchronized (sStatsdLock) {
if (sStatsd == null) {
sStatsd = IStatsd.Stub.asInterface(StatsFrameworkInitializer
.getStatsServiceManager()
.getStatsdServiceRegisterer()
.get());
if (sStatsd != null) {
try {
sStatsd.asBinder().linkToDeath(deathRecipient, /* flags */ 0);
} catch (RemoteException e) {
Log.e(TAG, "linkToDeath(StatsdDeathRecipient) failed");
statsdNotReadyLocked();
}
private IStatsd fetchStatsdServiceLocked() {
sStatsd = IStatsd.Stub.asInterface(StatsFrameworkInitializer
.getStatsServiceManager()
.getStatsdServiceRegisterer()
.get());
return sStatsd;
}
private void registerStatsdDeathRecipient(IStatsd statsd, List<BroadcastReceiver> receivers) {
StatsdDeathRecipient deathRecipient = new StatsdDeathRecipient(statsd, receivers);
try {
statsd.asBinder().linkToDeath(deathRecipient, /*flags=*/0);
} catch (RemoteException e) {
Log.e(TAG, "linkToDeath (StatsdDeathRecipient) failed");
// Statsd has already died. Unregister receivers ourselves.
for (BroadcastReceiver receiver : receivers) {
mContext.unregisterReceiver(receiver);
}
synchronized (sStatsdLock) {
if (statsd == sStatsd) {
statsdNotReadyLocked();
}
}
return sStatsd;
}
}
@@ -648,22 +647,23 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
* statsd.
*/
private void sayHiToStatsd() {
if (getStatsdNonblocking() != null) {
Log.e(TAG, "Trying to fetch statsd, but it was already fetched",
new IllegalStateException(
"sStatsd is not null when being fetched"));
return;
IStatsd statsd;
synchronized (sStatsdLock) {
if (sStatsd != null && sStatsd.asBinder().isBinderAlive()) {
Log.e(TAG, "statsd has already been fetched before",
new IllegalStateException("IStatsd object should be null or dead"));
return;
}
statsd = fetchStatsdServiceLocked();
}
StatsdDeathRecipient deathRecipient = new StatsdDeathRecipient();
IStatsd statsd = fetchStatsdService(deathRecipient);
if (statsd == null) {
Log.i(TAG,
"Could not yet find statsd to tell it that StatsCompanion is "
+ "alive.");
Log.i(TAG, "Could not yet find statsd to tell it that StatsCompanion is alive.");
return;
}
mStatsManagerService.statsdReady(statsd);
if (DEBUG) Log.d(TAG, "Saying hi to statsd");
mStatsManagerService.statsdReady(statsd);
try {
statsd.statsCompanionReady();
@@ -682,8 +682,7 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
mContext.registerReceiverForAllUsers(appUpdateReceiver, filter, null, null);
// Setup receiver for user initialize (which happens once for a new user)
// and
// if a user is removed.
// and if a user is removed.
filter = new IntentFilter(Intent.ACTION_USER_INITIALIZE);
filter.addAction(Intent.ACTION_USER_REMOVED);
mContext.registerReceiverForAllUsers(userUpdateReceiver, filter, null, null);
@@ -691,27 +690,20 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
// Setup receiver for device reboots or shutdowns.
filter = new IntentFilter(Intent.ACTION_REBOOT);
filter.addAction(Intent.ACTION_SHUTDOWN);
mContext.registerReceiverForAllUsers(
shutdownEventReceiver, filter, null, null);
mContext.registerReceiverForAllUsers(shutdownEventReceiver, filter, null, null);
// Only add the receivers if the registration is successful.
deathRecipient.addRegisteredBroadcastReceivers(
List.of(appUpdateReceiver, userUpdateReceiver, shutdownEventReceiver));
// Register death recipient.
List<BroadcastReceiver> broadcastReceivers =
List.of(appUpdateReceiver, userUpdateReceiver, shutdownEventReceiver);
registerStatsdDeathRecipient(statsd, broadcastReceivers);
// Used so we can call statsd.bootComplete() outside of the lock.
boolean shouldSendBootComplete = false;
synchronized (sStatsdLock) {
if (mBootCompleted && !mSentBootComplete) {
mSentBootComplete = true;
shouldSendBootComplete = true;
}
}
if (shouldSendBootComplete) {
// Tell statsd that boot has completed. The signal may have already been sent, but since
// the signal-receiving function is idempotent, that's ok.
if (mBootCompleted.get()) {
statsd.bootCompleted();
}
// Pull the latest state of UID->app name, version mapping when
// statsd starts.
// Pull the latest state of UID->app name, version mapping when statsd starts.
informAllUids(mContext);
Log.i(TAG, "Told statsd that StatsCompanionService is alive.");
@@ -722,18 +714,16 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
private class StatsdDeathRecipient implements IBinder.DeathRecipient {
private List<BroadcastReceiver> mReceiversToUnregister;
private final IStatsd mStatsd;
private final List<BroadcastReceiver> mReceiversToUnregister;
StatsdDeathRecipient() {
mReceiversToUnregister = new ArrayList<>();
}
public void addRegisteredBroadcastReceivers(List<BroadcastReceiver> receivers) {
synchronized (sStatsdLock) {
mReceiversToUnregister.addAll(receivers);
}
StatsdDeathRecipient(IStatsd statsd, List<BroadcastReceiver> receivers) {
mStatsd = statsd;
mReceiversToUnregister = receivers;
}
// It is possible for binderDied to be called after a restarted statsd calls statsdReady,
// but that's alright because the code does not assume an ordering of the two calls.
@Override
public void binderDied() {
Log.i(TAG, "Statsd is dead - erase all my knowledge, except pullers");
@@ -762,13 +752,19 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
}
}
}
// We only unregister in binder death becaseu receivers can only be unregistered
// once, or an IllegalArgumentException is thrown.
// Unregister receivers on death because receivers can only be unregistered once.
// Otherwise, an IllegalArgumentException is thrown.
for (BroadcastReceiver receiver: mReceiversToUnregister) {
mContext.unregisterReceiver(receiver);
}
statsdNotReadyLocked();
mSentBootComplete = false;
// It's possible for statsd to have restarted and called statsdReady, causing a new
// sStatsd binder object to be fetched, before the binderDied callback runs. Only
// call #statsdNotReadyLocked if that hasn't happened yet.
if (mStatsd == sStatsd) {
statsdNotReadyLocked();
}
}
}
}
@@ -779,19 +775,12 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
}
void bootCompleted() {
mBootCompleted.set(true);
IStatsd statsd = getStatsdNonblocking();
synchronized (sStatsdLock) {
mBootCompleted = true;
if (mSentBootComplete) {
// do not send a boot complete a second time.
return;
}
if (statsd == null) {
// Statsd is not yet ready.
// Delay the boot completed ping to {@link #sayHiToStatsd()}
return;
}
mSentBootComplete = true;
if (statsd == null) {
// Statsd is not yet ready.
// Delay the boot completed ping to {@link #sayHiToStatsd()}
return;
}
try {
statsd.bootCompleted();
@@ -808,8 +797,7 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
}
synchronized (sStatsdLock) {
writer.println(
"Number of configuration files deleted: " + mDeletedFiles.size());
writer.println("Number of configuration files deleted: " + mDeletedFiles.size());
if (mDeletedFiles.size() > 0) {
writer.println(" timestamp, deleted file name");
}
@@ -817,8 +805,7 @@ public class StatsCompanionService extends IStatsCompanionService.Stub {
SystemClock.currentThreadTimeMillis() - SystemClock.elapsedRealtime();
for (Long elapsedMillis : mDeletedFiles.keySet()) {
long deletionMillis = lastBootMillis + elapsedMillis;
writer.println(
" " + deletionMillis + ", " + mDeletedFiles.get(elapsedMillis));
writer.println(" " + deletionMillis + ", " + mDeletedFiles.get(elapsedMillis));
}
}
}

2
cmds/statsd/src/StatsService.cpp
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@@ -343,9 +343,11 @@ status_t StatsService::handleShellCommand(int in, int out, int err, const char**
if (!utf8Args[0].compare(String8("print-logs"))) {
return cmd_print_logs(out, utf8Args);
}
if (!utf8Args[0].compare(String8("send-active-configs"))) {
return cmd_trigger_active_config_broadcast(out, utf8Args);
}
if (!utf8Args[0].compare(String8("data-subscribe"))) {
{
std::lock_guard<std::mutex> lock(mShellSubscriberMutex);