260 lines
11 KiB
Kotlin
260 lines
11 KiB
Kotlin
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package io.heckel.ntfy.msg
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import android.app.*
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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.IBinder
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import android.os.PowerManager
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import android.os.SystemClock
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import android.util.Log
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import androidx.core.app.NotificationCompat
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import io.heckel.ntfy.R
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import io.heckel.ntfy.app.Application
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import io.heckel.ntfy.data.Subscription
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import io.heckel.ntfy.data.topicUrl
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import io.heckel.ntfy.ui.MainActivity
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import kotlinx.coroutines.*
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import okhttp3.Call
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import java.util.concurrent.ConcurrentHashMap
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import java.util.concurrent.atomic.AtomicBoolean
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/**
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*
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* Largely modeled after this fantastic resource:
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* - https://robertohuertas.com/2019/06/29/android_foreground_services/
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* - https://github.com/robertohuertasm/endless-service/blob/master/app/src/main/java/com/robertohuertas/endless/EndlessService.kt
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*/
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class SubscriberService : Service() {
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private var wakeLock: PowerManager.WakeLock? = null
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private var isServiceStarted = false
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private val repository by lazy { (application as Application).repository }
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private val jobs = ConcurrentHashMap<Long, Job>() // Subscription ID -> Job
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private val calls = ConcurrentHashMap<Long, Call>() // Subscription ID -> Cal
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private val api = ApiService()
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private val notifier = NotificationService(this)
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override fun onBind(intent: Intent): IBinder? {
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return null // We don't provide binding, so return null
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}
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override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
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Log.d(TAG, "onStartCommand executed with startId: $startId")
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if (intent != null) {
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val action = intent.action
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Log.d(TAG, "using an intent with action $action")
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when (action) {
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Actions.START.name -> startService()
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Actions.STOP.name -> stopService()
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else -> Log.e(TAG, "This should never happen. No action in the received intent")
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}
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} else {
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Log.d(TAG, "with a null intent. It has been probably restarted by the system.")
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}
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return START_STICKY // restart if system kills the service
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}
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override fun onCreate() {
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super.onCreate()
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Log.d(TAG, "The service has been created".toUpperCase())
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val notification = createNotification()
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startForeground(SERVICE_ID, notification)
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}
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override fun onDestroy() {
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super.onDestroy()
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Log.d(TAG, "The service has been destroyed".toUpperCase())
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}
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override fun onTaskRemoved(rootIntent: Intent) {
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val restartServiceIntent = Intent(applicationContext, SubscriberService::class.java).also {
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it.setPackage(packageName)
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};
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val restartServicePendingIntent: PendingIntent = PendingIntent.getService(this, 1, restartServiceIntent, PendingIntent.FLAG_ONE_SHOT);
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applicationContext.getSystemService(Context.ALARM_SERVICE);
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val alarmService: AlarmManager = applicationContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager;
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alarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + 1000, restartServicePendingIntent);
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}
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private fun startService() {
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if (isServiceStarted) {
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launchOrCancelJobs()
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return
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}
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Log.d(TAG, "Starting the foreground service task")
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isServiceStarted = true
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saveServiceState(this, ServiceState.STARTED)
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wakeLock = (getSystemService(Context.POWER_SERVICE) as PowerManager).run {
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newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKE_LOCK_TAG).apply {
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acquire()
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}
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}
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launchOrCancelJobs()
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}
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private fun stopService() {
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Log.d(TAG, "Stopping the foreground service")
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// Cancelling all remaining jobs and open HTTP calls
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jobs.values.forEach { job -> job.cancel() }
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calls.values.forEach { call -> call.cancel() }
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jobs.clear()
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calls.clear()
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// Releasing wake-lock and stopping ourselves
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try {
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wakeLock?.let {
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if (it.isHeld) {
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it.release()
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}
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}
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stopForeground(true)
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stopSelf()
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} catch (e: Exception) {
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Log.d(TAG, "Service stopped without being started: ${e.message}")
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}
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isServiceStarted = false
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saveServiceState(this, ServiceState.STOPPED)
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}
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private fun launchOrCancelJobs() = GlobalScope.launch(Dispatchers.IO) {
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val subscriptions = repository.getSubscriptions().filter { s -> s.instant }
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val subscriptionIds = subscriptions.map { it.id }
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Log.d(TAG, "Starting/stopping jobs for current subscriptions")
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Log.d(TAG, "- Subscriptions: $subscriptions")
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Log.d(TAG, "- Jobs: $jobs")
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Log.d(TAG, "- HTTP calls: $calls")
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subscriptions.forEach { subscription ->
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if (!jobs.containsKey(subscription.id)) {
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Log.d(TAG, "Starting job for $subscription")
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jobs[subscription.id] = launchJob(this, subscription)
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}
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}
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jobs.keys().toList().forEach { subscriptionId ->
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if (!subscriptionIds.contains(subscriptionId)) {
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Log.d(TAG, "Cancelling job for $subscriptionId")
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val job = jobs.remove(subscriptionId)
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val call = calls.remove(subscriptionId)
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job?.cancel()
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call?.cancel()
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}
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}
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}
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private fun launchJob(scope: CoroutineScope, subscription: Subscription): Job = scope.launch(Dispatchers.IO) {
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val url = topicUrl(subscription.baseUrl, subscription.topic)
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Log.d(TAG, "[$url] Starting connection job")
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var since = 0L
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var retryMillis = 0L
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while (isActive && isServiceStarted) {
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Log.d(TAG, "[$url] (Re-)starting subscription for $subscription")
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val startTime = System.currentTimeMillis()
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try {
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val failed = AtomicBoolean(false)
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val notify = { n: io.heckel.ntfy.data.Notification ->
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Log.d(TAG, "[$url] Received new notification: $n")
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since = n.timestamp
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scope.launch(Dispatchers.IO) {
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val added = repository.addNotification(n)
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if (added) {
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Log.d(TAG, "[$url] Showing notification: $n")
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notifier.send(subscription, n.message)
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}
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}
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Unit
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}
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val fail = { e: Exception ->
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Log.e(TAG, "[$url] Connection failed (1): ${e.message}", e)
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failed.set(true)
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}
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val call = api.subscribe(subscription.id, subscription.baseUrl, subscription.topic, since, notify, fail)
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calls[subscription.id] = call
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while (!failed.get() && !call.isCanceled() && isActive && isServiceStarted) {
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Log.d(TAG, "[$url] Connection is active (failed=$failed, callCanceled=${call.isCanceled()}, jobActive=$isActive, serviceStarted=$isServiceStarted")
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delay(CONNECTION_LOOP_DELAY_MILLIS) // Resumes immediately if job is cancelled
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}
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} catch (e: Exception) {
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Log.e(TAG, "[$url] Connection failed (2): ${e.message}", e)
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}
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if (isActive && isServiceStarted) {
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val connectionDurationMillis = System.currentTimeMillis() - startTime
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if (connectionDurationMillis > RETRY_RESET_AFTER_MILLIS) {
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retryMillis = RETRY_STEP_MILLIS
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} else if (retryMillis + RETRY_STEP_MILLIS >= RETRY_MAX_MILLIS) {
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retryMillis = RETRY_MAX_MILLIS
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} else {
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retryMillis += RETRY_STEP_MILLIS
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}
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Log.d(TAG, "Connection failed, retrying connection in ${retryMillis/1000}s ...")
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delay(retryMillis)
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}
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}
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Log.d(TAG, "[$url] Connection job SHUT DOWN")
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}
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private fun createNotification(): Notification {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
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val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
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val channelName = getString(R.string.channel_subscriber_service_name) // Show's up in UI
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val channel = NotificationChannel(CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_LOW).let {
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it.setShowBadge(false) // Don't show long-press badge
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it
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}
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notificationManager.createNotificationChannel(channel)
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}
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val pendingIntent: PendingIntent = Intent(this, MainActivity::class.java).let { notificationIntent ->
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PendingIntent.getActivity(this, 0, notificationIntent, 0)
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}
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val title = getString(R.string.channel_subscriber_notification_title)
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val text = getString(R.string.channel_subscriber_notification_text)
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return NotificationCompat.Builder(this, CHANNEL_ID)
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.setSmallIcon(R.drawable.ic_notification_icon)
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.setContentTitle(title)
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.setContentText(text)
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.setContentIntent(pendingIntent)
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.setSound(null)
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.setShowWhen(false) // Don't show date/time
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.build()
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}
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enum class Actions {
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START,
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STOP
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}
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enum class ServiceState {
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STARTED,
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STOPPED,
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}
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companion object {
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private const val TAG = "NtfySubscriberService"
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private const val WAKE_LOCK_TAG = "SubscriberService:lock"
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private const val CHANNEL_ID = "ntfy-subscriber"
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private const val SERVICE_ID = 2586
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private const val SHARED_PREFS_ID = "SubscriberService"
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private const val SHARED_PREFS_SERVICE_STATE = "ServiceState"
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private const val CONNECTION_LOOP_DELAY_MILLIS = 30_000L
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private const val RETRY_STEP_MILLIS = 5_000L
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private const val RETRY_MAX_MILLIS = 60_000L
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private const val RETRY_RESET_AFTER_MILLIS = 30_000L
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fun saveServiceState(context: Context, state: ServiceState) {
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val sharedPrefs = context.getSharedPreferences(SHARED_PREFS_ID, Context.MODE_PRIVATE)
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sharedPrefs.edit()
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.putString(SHARED_PREFS_SERVICE_STATE, state.name)
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.apply()
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}
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fun readServiceState(context: Context): ServiceState {
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val sharedPrefs = context.getSharedPreferences(SHARED_PREFS_ID, Context.MODE_PRIVATE)
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val value = sharedPrefs.getString(SHARED_PREFS_SERVICE_STATE, ServiceState.STOPPED.name)
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return ServiceState.valueOf(value!!)
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}
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}
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}
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