Capture fingerprint statistics for estimating FRR (bcc100aa) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/fingerprint/FingerprintService.java

+57 −2

Original line number	Diff line number	Diff line
		@@ -72,6 +72,7 @@ import java.io.PrintWriter;
		import java.util.ArrayList;
		import java.util.Arrays;
		import java.util.Collections;
		import java.util.HashMap;
		import java.util.List;

		/**
		@@ -90,10 +91,17 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		private static final String ACTION_LOCKOUT_RESET =
		"com.android.server.fingerprint.ACTION_LOCKOUT_RESET";

		private class PerformanceStats {
		int accept; // number of accepted fingerprints
		int reject; // number of rejected fingerprints
		int acquire; // total number of acquisitions. Should be >= accept+reject due to poor image
		// acquisition in some cases (too fast, too slow, dirty sensor, etc.)
		int lockout; // total number of lockouts
		}

		private final ArrayList<FingerprintServiceLockoutResetMonitor> mLockoutMonitors =
		new ArrayList<>();
		private final AppOpsManager mAppOps;

		private static final long FAIL_LOCKOUT_TIMEOUT_MS = 30*1000;
		private static final int MAX_FAILED_ATTEMPTS = 5;
		private static final long CANCEL_TIMEOUT_LIMIT = 3000; // max wait for onCancel() from HAL,in ms
		@@ -110,6 +118,15 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		private ClientMonitor mCurrentClient;
		private ClientMonitor mPendingClient;
		private long mCurrentAuthenticatorId;
		private PerformanceStats mPerformanceStats;

		// Normal fingerprint authentications are tracked by mPerformanceMap.
		private HashMap<Integer, PerformanceStats> mPerformanceMap
		= new HashMap<Integer, PerformanceStats>();

		// Transactions that make use of CryptoObjects are tracked by mCryptoPerformaceMap.
		private HashMap<Integer, PerformanceStats> mCryptoPerformanceMap
		= new HashMap<Integer, PerformanceStats>();

		private Handler mHandler = new Handler() {
		@Override
		@@ -246,6 +263,11 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		if (client != null && client.onAuthenticated(fingerId, groupId)) {
		removeClient(client);
		}
		if (fingerId != 0) {
		mPerformanceStats.accept++;
		} else {
		mPerformanceStats.reject++;
		}
		}

		protected void handleAcquired(long deviceId, int acquiredInfo) {
		@@ -253,6 +275,11 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		if (client != null && client.onAcquired(acquiredInfo)) {
		removeClient(client);
		}
		if (mPerformanceStats != null && !inLockoutMode()
		&& client instanceof AuthenticationClient) {
		// ignore enrollment acquisitions or acquisitions when we're locked out
		mPerformanceStats.acquire++;
		}
		}

		protected void handleEnrollResult(long deviceId, int fingerId, int groupId, int remaining) {
		@@ -505,6 +532,9 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		@Override
		public boolean handleFailedAttempt() {
		mFailedAttempts++;
		if (mFailedAttempts == MAX_FAILED_ATTEMPTS) {
		mPerformanceStats.lockout++;
		}
		if (inLockoutMode()) {
		// Failing multiple times will continue to push out the lockout time.
		scheduleLockoutReset();
		@@ -742,12 +772,24 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		mHandler.post(new Runnable() {
		@Override
		public void run() {
		MetricsLogger.histogram(mContext, "fingerprint_token", opId != 0L ? 1 : 0);
		if (!canUseFingerprint(opPackageName, true /* foregroundOnly */,
		callingUid, pid)) {
		if (DEBUG) Slog.v(TAG, "authenticate(): reject " + opPackageName);
		return;
		}

		MetricsLogger.histogram(mContext, "fingerprint_token", opId != 0L ? 1 : 0);

		// Get performance stats object for this user.
		HashMap<Integer, PerformanceStats> pmap
		= (opId == 0) ? mPerformanceMap : mCryptoPerformanceMap;
		PerformanceStats stats = pmap.get(mCurrentUserId);
		if (stats == null) {
		stats = new PerformanceStats();
		pmap.put(mCurrentUserId, stats);
		}
		mPerformanceStats = stats;

		startAuthentication(token, opId, callingUserId, groupId, receiver,
		flags, restricted, opPackageName);
		}
		@@ -924,9 +966,21 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
		for (UserInfo user : UserManager.get(getContext()).getUsers()) {
		final int userId = user.getUserHandle().getIdentifier();
		final int N = mFingerprintUtils.getFingerprintsForUser(mContext, userId).size();
		PerformanceStats stats = mPerformanceMap.get(userId);
		PerformanceStats cryptoStats = mCryptoPerformanceMap.get(userId);
		JSONObject set = new JSONObject();
		set.put("id", userId);
		set.put("count", N);
		set.put("accept", (stats != null) ? stats.accept : 0);
		set.put("reject", (stats != null) ? stats.reject : 0);
		set.put("acquire", (stats != null) ? stats.acquire : 0);
		set.put("lockout", (stats != null) ? stats.lockout : 0);
		// cryptoStats measures statistics about secure fingerprint transactions
		// (e.g. to unlock password storage, make secure purchases, etc.)
		set.put("acceptCrypto", (cryptoStats != null) ? cryptoStats.accept : 0);
		set.put("rejectCrypto", (cryptoStats != null) ? cryptoStats.reject : 0);
		set.put("acquireCrypto", (cryptoStats != null) ? cryptoStats.acquire : 0);
		set.put("lockoutCrypto", (cryptoStats != null) ? cryptoStats.lockout : 0);
		sets.put(set);
		}

		@@ -947,6 +1001,7 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe

		private void updateActiveGroup(int userId, String clientPackage) {
		IFingerprintDaemon daemon = getFingerprintDaemon();

		if (daemon != null) {
		try {
		userId = getUserOrWorkProfileId(clientPackage, userId);