Merge "Add server flag for the lower bound" into sc-dev

services/core/java/com/android/server/timedetector/ServerFlags.java

@@ -30,7 +30,9 @@ import com.android.server.timezonedetector.ServiceConfigAccessor;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.time.DateTimeException;
 import java.time.Duration;
+import java.time.Instant;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
@@ -62,6 +64,8 @@ public final class ServerFlags {
             KEY_LOCATION_TIME_ZONE_DETECTION_UNCERTAINTY_DELAY_MILLIS,
             KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_OVERRIDE,
             KEY_LOCATION_TIME_ZONE_DETECTION_SETTING_ENABLED_DEFAULT,
+            KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE,
+            KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE,
     })
     @Retention(RetentionPolicy.SOURCE)
     @interface DeviceConfigKey {}
@@ -144,6 +148,14 @@ public final class ServerFlags {
     public static final String KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE =
             "time_detector_origin_priorities_override";
 
+    /**
+     * The key to override the time detector lower bound configuration. The values is the number of
+     * milliseconds since the beginning of the Unix epoch.
+     */
+    @DeviceConfigKey
+    public static final String KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE =
+            "time_detector_lower_bound_millis_override";
+
     @GuardedBy("mListeners")
     private final ArrayMap<ConfigurationChangeListener, Set<String>> mListeners = new ArrayMap<>();
 
@@ -230,6 +242,25 @@ public final class ServerFlags {
         return Optional.of(string.get().split(","));
     }
 
+    /**
+     * Returns an {@link Instant} from {@link DeviceConfig} from the system_time
+     * namespace, returns the {@code defaultValue} if the value is missing or invalid.
+     */
+    @NonNull
+    public Optional<Instant> getOptionalInstant(@DeviceConfigKey String key) {
+        String value = DeviceConfig.getProperty(NAMESPACE_SYSTEM_TIME, key);
+        if (value == null) {
+            return Optional.empty();
+        }
+
+        try {
+            long millis = Long.parseLong(value);
+            return Optional.of(Instant.ofEpochMilli(millis));
+        } catch (DateTimeException | NumberFormatException e) {
+            return Optional.empty();
+        }
+    }
+
     /**
      * Returns an optional boolean value from {@link DeviceConfig} from the system_time
      * namespace, returns {@link Optional#empty()} if there is no explicit value set.

services/core/java/com/android/server/timedetector/ServiceConfigAccessor.java

@@ -15,6 +15,7 @@
  */
 package com.android.server.timedetector;
 
+import static com.android.server.timedetector.ServerFlags.KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE;
 import static com.android.server.timedetector.ServerFlags.KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE;
 import static com.android.server.timedetector.TimeDetectorStrategy.ORIGIN_NETWORK;
 import static com.android.server.timedetector.TimeDetectorStrategy.ORIGIN_TELEPHONY;
@@ -65,6 +66,7 @@ final class ServiceConfigAccessor {
 
     private static final Set<String> SERVER_FLAGS_KEYS_TO_WATCH = Collections.unmodifiableSet(
             new ArraySet<>(new String[] {
+                    KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE,
                     KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE,
             }));
 
@@ -137,8 +139,10 @@ final class ServiceConfigAccessor {
         return mSystemClockUpdateThresholdMillis;
     }
 
+    @NonNull
     Instant autoTimeLowerBound() {
-        return TIME_LOWER_BOUND_DEFAULT;
+        return mServerFlags.getOptionalInstant(KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE)
+                .orElse(TIME_LOWER_BOUND_DEFAULT);
     }
 
     /**

services/core/java/com/android/server/timedetector/TimeDetectorShellCommand.java

@@ -18,6 +18,7 @@ package com.android.server.timedetector;
 import static android.app.timedetector.TimeDetector.SHELL_COMMAND_IS_AUTO_DETECTION_ENABLED;
 import static android.provider.DeviceConfig.NAMESPACE_SYSTEM_TIME;
 
+import static com.android.server.timedetector.ServerFlags.KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE;
 import static com.android.server.timedetector.ServerFlags.KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE;
 
 import android.os.ShellCommand;
@@ -68,6 +69,9 @@ class TimeDetectorShellCommand extends ShellCommand {
         pw.println();
         pw.printf("This service is also affected by the following device_config flags in the"
                 + " %s namespace:\n", NAMESPACE_SYSTEM_TIME);
+        pw.printf("    %s - the lower bound used to validate time suggestions when they are"
+                        + " received.\n", KEY_TIME_DETECTOR_LOWER_BOUND_MILLIS_OVERRIDE);
+        pw.println("         Specified in milliseconds since the start of the Unix epoch.");
         pw.printf("    %s - [default=null], a comma separated list of origins. See"
                 + " TimeDetectorStrategy for details\n",
                 KEY_TIME_DETECTOR_ORIGIN_PRIORITIES_OVERRIDE);

services/core/java/com/android/server/timedetector/TimeDetectorStrategyImpl.java

@@ -325,9 +325,9 @@ public final class TimeDetectorStrategyImpl implements TimeDetectorStrategy {
         ipw.println("mEnvironment.systemClockMillis()=" + mEnvironment.systemClockMillis());
         ipw.println("mEnvironment.systemClockUpdateThresholdMillis()="
                 + mEnvironment.systemClockUpdateThresholdMillis());
+        Instant autoTimeLowerBound = mEnvironment.autoTimeLowerBound();
         ipw.printf("mEnvironment.autoTimeLowerBound()=%s(%s)\n",
-                mEnvironment.autoTimeLowerBound(),
-                mEnvironment.autoTimeLowerBound().toEpochMilli());
+                autoTimeLowerBound, autoTimeLowerBound.toEpochMilli());
         String priorities =
                 Arrays.stream(mEnvironment.autoOriginPriorities())
                         .mapToObj(TimeDetectorStrategy::originToString)