/* Copyright (C) 2015-2024 Andreas Shimokawa, Carsten Pfeiffer, José Rebelo
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.externalevents;
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import android.app.AlarmManager;
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import android.app.PendingIntent;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Build;
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import android.os.SystemClock;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.time.Instant;
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import java.time.ZoneId;
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import java.time.zone.ZoneOffsetTransition;
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import java.time.zone.ZoneRules;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import nodomain.freeyourgadget.gadgetbridge.BuildConfig;
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import nodomain.freeyourgadget.gadgetbridge.GBApplication;
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import nodomain.freeyourgadget.gadgetbridge.util.AndroidUtils;
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import nodomain.freeyourgadget.gadgetbridge.util.DateTimeUtils;
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import nodomain.freeyourgadget.gadgetbridge.util.GB;
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import nodomain.freeyourgadget.gadgetbridge.util.PendingIntentUtils;
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import nodomain.freeyourgadget.gadgetbridge.util.Prefs;
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public class TimeChangeReceiver extends BroadcastReceiver {
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private static final Logger LOG = LoggerFactory.getLogger(TimeChangeReceiver.class);
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public static final String ACTION_DST_CHANGED_OR_PERIODIC_SYNC = "nodomain.freeyourgadget.gadgetbridge.DST_CHANGED_OR_PERIODIC_SYNC";
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public static final long PERIODIC_SYNC_INTERVAL_MS = 158003000; // 43:53:23.000
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public static final long PERIODIC_SYNC_INTERVAL_MAX_MS = 172800000; // 48 hours
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@Override
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public void onReceive(Context context, Intent intent) {
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final Prefs prefs = GBApplication.getPrefs();
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final String action = intent.getAction();
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if (action == null) {
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LOG.warn("Null action");
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return;
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}
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if (!prefs.getBoolean("datetime_synconconnect", true)) {
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LOG.warn("Ignoring time change for {}, time sync is disabled", action);
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return;
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}
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switch (action) {
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case Intent.ACTION_TIME_CHANGED:
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case Intent.ACTION_TIMEZONE_CHANGED:
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case ACTION_DST_CHANGED_OR_PERIODIC_SYNC:
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// Continue after the switch
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break;
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default:
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LOG.warn("Unknown action {}", action);
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return;
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}
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// acquire wake lock, otherwise device might enter deep sleep immediately after returning from onReceive()
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AndroidUtils.acquirePartialWakeLock(context, "TimeSyncWakeLock", 10100);
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final Date newTime = GregorianCalendar.getInstance().getTime();
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LOG.info("Time/Timezone changed or periodic sync, syncing with device: {} ({}), {}", DateTimeUtils.formatDate(newTime), newTime.toGMTString(), intent.getAction());
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GBApplication.deviceService().onSetTime();
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// Reschedule the next DST change (since the timezone may have changed) or periodic sync
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scheduleNextDstChangeOrPeriodicSync(context);
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}
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/**
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* Schedule an alarm to trigger on the next DST change, since ACTION_TIMEZONE_CHANGED is not broadcast otherwise
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* or schedule an alarm to trigger after PERIODIC_SYNC_INTERVAL_MS (whichever is earlier).
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*
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* @param context the context
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*/
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public static void scheduleNextDstChangeOrPeriodicSync(final Context context) {
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final ZoneId zoneId = ZoneId.systemDefault();
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final ZoneRules zoneRules = zoneId.getRules();
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final Instant now = Instant.now();
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final ZoneOffsetTransition transition = zoneRules.nextTransition(now);
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final Intent i = new Intent(ACTION_DST_CHANGED_OR_PERIODIC_SYNC);
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i.setPackage(BuildConfig.APPLICATION_ID);
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final PendingIntent pi = PendingIntentUtils.getBroadcast(context, 0, i, 0, false);
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final AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
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boolean exactAlarm = false;
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long delayMillis = PERIODIC_SYNC_INTERVAL_MS;
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if (transition != null) {
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final long nextDstMillis = transition.getInstant().toEpochMilli();
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final long dstDelayMillis = nextDstMillis - now.toEpochMilli() + 5000L;
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if (dstDelayMillis < PERIODIC_SYNC_INTERVAL_MAX_MS) {
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exactAlarm = canScheduleExactAlarms(context, am);
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delayMillis = dstDelayMillis;
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LOG.info("Scheduling next DST change: {} (in {} millis) (exact = {})", nextDstMillis, delayMillis, exactAlarm);
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}
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} else {
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LOG.warn("No DST transition found for {}", zoneId);
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}
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if (delayMillis == PERIODIC_SYNC_INTERVAL_MS) {
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LOG.info("Scheduling next periodic time sync in {} millis (exact = {})", delayMillis, exactAlarm);
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}
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am.cancel(pi);
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boolean scheduledExact = false;
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if (exactAlarm) {
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try {
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am.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + delayMillis, pi);
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scheduledExact = true;
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} catch (final Exception e) {
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LOG.error("Failed to schedule exact alarm for next DST change or periodic time sync", e);
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}
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}
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// Fallback to inexact alarm if the exact one failed
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if (!scheduledExact) {
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try {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
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am.setAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + delayMillis, pi);
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} else {
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am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + delayMillis, pi);
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}
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} catch (final Exception e) {
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LOG.error("Failed to schedule inexact alarm for next DST change or periodic time sync", e);
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}
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}
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}
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public static void ifEnabledScheduleNextDstChangeOrPeriodicSync(final Context context) {
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if (GBApplication.getPrefs().getBoolean("datetime_synconconnect", true)) {
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scheduleNextDstChangeOrPeriodicSync(context);
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}
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}
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private static boolean canScheduleExactAlarms(final Context context, final AlarmManager am) {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
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return am.canScheduleExactAlarms();
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} else {
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return GB.checkPermission(context, "android.permission.SCHEDULE_EXACT_ALARM");
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}
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}
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}
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