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[Bug] [Firebase Database] Repeatedly connecting and disconnecting every 2 mins, when app is in the background, without doing anything
See original GitHub issue[READ] Step 1: Are you in the right place?
Issues filed here should be about bugs in the code in this repository. If you have a general question, need help debugging, or fall into some other category use one of these other channels:
- For general technical questions, post a question on StackOverflow with the firebase tag.
- For general Firebase discussion, use the firebase-talk google group.
- For help troubleshooting your application that does not fall under one of the above categories, reach out to the personalized Firebase support channel.
[REQUIRED] Step 2: Describe your environment
- Android Studio version: 2020.3.1
- Firebase Component: Database
- Component version: 20.0.1
[REQUIRED] Step 3: Describe the problem
Many android app clients are connecting and disconnecting repeatedly every 2 mins (~120_xxx ms), without doing anything in between.
This causes several issues
- Increased client device battery usage
- Increased download bandwidth usages due to constant SSL handshake - A very rough estimate of 1MB per user per day
- Constantly consumes a concurrent connection per user
The issue is caused by using DatabaseRef.get() in a PeriodicWorker (runs every 30 mins), and when a long running Foreground Service is also present
Expected Behaviour
Firebase Database to establish a connection when it invokes get() and then close the connection when the Worker completes.
Actual Behaviour
A connection is established at start of Worker and closed when Worker completes. BUT then Firebase establishes a new connection ~1 sec after that, and closes the connection after 2 min. And tries to open another connection, and continues repeating this cycle.
Example snippet (of 1 client out of many) from firebase database:profile of production for about 15 minutes
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631063531765}
{"pendingTime":1,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631063532627}
{"pendingTime":1,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631063652824}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631063653727}
{"pendingTime":1,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631063773965}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631063774833}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631063895016}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631063895995}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631064016221}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631064017128}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631064137299}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631064138536}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631064258699}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631064259584}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-disconnect","timestamp":1631064379768}
{"pendingTime":0,"client":{"remoteAddress":{"address":"[same-client-ip]"},"userAgent":{"browser":"firebase","os":"android","platform":"native","userAgentString":"Firebase/5/20.0.1/28/Android","version":"20_0_1"}},"name":"concurrent-connect","timestamp":1631064380580}
When I reproduced it in a dev environment, I found the following logcat with debug enabled
...
...
...
D/WebSocket: ws_61 - WebSocket reached EOF.
D/WebSocket: ws_61 - closing itself
D/Connection: conn_61 - Realtime connection lost
D/Connection: conn_61 - closing realtime connection
D/PersistentConnection: pc_0 - Got on disconnect due to OTHER
D/PersistentConnection: pc_0 - Scheduling connection attempt
D/ConnectionRetryHelper: Scheduling retry in 0ms
D/PersistentConnection: pc_0 - Trying to fetch auth token
D/PersistentConnection: pc_0 - Trying to fetch app check token
D/WebSocket: ws_61 - closed
D/WebSocket: ws_61 - WebSocket error.
com.google.firebase.database.tubesock.WebSocketException: IO Exception
at com.google.firebase.database.tubesock.WebSocketWriter.runWriter(WebSocketWriter.java:159)
at com.google.firebase.database.tubesock.WebSocketWriter.access$000(WebSocketWriter.java:30)
at com.google.firebase.database.tubesock.WebSocketWriter$1.run(WebSocketWriter.java:47)
at java.lang.Thread.run(Thread.java:919)
Caused by: java.net.SocketException: Socket is closed
at com.android.org.conscrypt.AbstractConscryptSocket.checkOpen(AbstractConscryptSocket.java:581)
at com.android.org.conscrypt.ConscryptFileDescriptorSocket$SSLOutputStream.write(ConscryptFileDescriptorSocket.java:643)
at java.nio.channels.Channels$WritableByteChannelImpl.write(Channels.java:453)
at com.google.firebase.database.tubesock.WebSocketWriter.writeMessage(WebSocketWriter.java:138)
at com.google.firebase.database.tubesock.WebSocketWriter.runWriter(WebSocketWriter.java:152)
at com.google.firebase.database.tubesock.WebSocketWriter.access$000(WebSocketWriter.java:30)
at com.google.firebase.database.tubesock.WebSocketWriter$1.run(WebSocketWriter.java:47)
at java.lang.Thread.run(Thread.java:919)
D/PersistentConnection: pc_0 - Successfully fetched token, opening connection
D/Connection: conn_62 - Opening a connection
D/WebSocket: ws_62 - websocket opened
D/WebSocket: ws_62 - ws message: {"t":"c","d":{"t":"h","d":{"ts":1631332588172,"v":"5","h":"s-usc1c-nss-227.firebaseio.com","s":"ceXCNpzNUdXnULU5cX8zYWsexVNUBQb4"}}}
D/WebSocket: ws_62 - Reset keepAlive
D/WebSocket: ws_62 - Reset keepAlive. Remaining: 44998
D/WebSocket: ws_62 - HandleNewFrameCount: 1
D/WebSocket: ws_62 - handleIncomingFrame complete frame: {t=c, d={t=h, d={h=s-usc1c-nss-227.firebaseio.com, s=ceXCNpzNUdXnULU5cX8zYWsexVNUBQb4, v=5, ts=1631332588172}}}
D/Connection: conn_62 - Got control message: {t=h, d={h=s-usc1c-nss-227.firebaseio.com, s=ceXCNpzNUdXnULU5cX8zYWsexVNUBQb4, v=5, ts=1631332588172}}
D/Connection: conn_62 - realtime connection established
D/PersistentConnection: pc_0 - onReady
D/PersistentConnection: pc_0 - handling timestamp
D/PersistentConnection: pc_0 - calling restore tokens
D/PersistentConnection: pc_0 - Not restoring auth because auth token is null.
D/PersistentConnection: pc_0 - Restoring outstanding listens
D/PersistentConnection: pc_0 - Restoring writes.
D/PersistentConnection: pc_0 - Restoring reads.
D/WebSocket: ws_62 - WebSocket reached EOF.
D/WebSocket: ws_62 - closing itself
D/Connection: conn_62 - Realtime connection lost
D/Connection: conn_62 - closing realtime connection
D/PersistentConnection: pc_0 - Got on disconnect due to OTHER
...
...
...
Steps to reproduce:
I don’t know the exact conditions to reproduce the issue, but it is always reproducible on a real device with a simple Periodic Worker and Foreground Service. I was unable to reproduce in emulator.
- Create a project with the 2 classes below
- Start Periodic Worker with
RtdbWorker.scheduleWorker() - Start Foreground Service with
FgService.start() - Manually disable battery optimisation for app (Not sure if this step is required)
Let the FgService and Worker run the background. Use the device as normal (including leaving the device on table, etc) for some extended period of time, and you will notice in logcat there are constant connection and disconnection
NOTE:
- The issue does not appear immediately after 1st run of the worker.
- May have some relationship/interaction with device Doze.
- Dev device is Samsung S9+
Relevant Code:
RtdbWorker.kt
package com.ebhs.rtdbworker
import android.content.Context
import android.util.Log
import androidx.work.*
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.Logger
import com.google.firebase.database.ktx.database
import com.google.firebase.database.ktx.getValue
import com.google.firebase.ktx.Firebase
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.tasks.await
import kotlinx.coroutines.withContext
import java.util.concurrent.TimeUnit
class RtdbWorker(context: Context, workerParams: WorkerParameters) : CoroutineWorker(context, workerParams) {
companion object {
const val TAG = "RtdbWorker"
const val WorkerKey = "WorkerKey"
// const val docPath = "/doc/id123"
const val docPath = "/doc/notExist"
suspend fun tryGetData() = coroutineScope {
Log.d(TAG, "Getting data")
val data = getData()
Log.d(TAG, "${data}")
}
fun scheduleWorker(context: Context) {
Log.d(TAG, "Enqueuing work")
val worker = PeriodicWorkRequestBuilder<RtdbWorker>(30, TimeUnit.MINUTES)
.setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 1, TimeUnit.MINUTES)
.build()
WorkManager.getInstance(context).enqueueUniquePeriodicWork(WorkerKey, ExistingPeriodicWorkPolicy.KEEP, worker)
}
fun stopWorker(context: Context) {
WorkManager.getInstance(context).cancelUniqueWork(WorkerKey)
}
private suspend fun getData() = withContext(Dispatchers.IO) {
Rtdb.instance.getReference(docPath)
.get()
.await()
.getValue<Map<String, Any>>()
}
}
override suspend fun doWork(): Result {
val data = try {
getData()
} catch (e: Exception) {
val errMsg = "Error message"
Log.e(TAG, errMsg, e)
return Result.retry()
}
Log.d(TAG, "${data}")
return Result.success()
}
}
object Rtdb {
private val defaultInstance: FirebaseDatabase = Firebase.database
init {
defaultInstance.setPersistenceEnabled(true)
defaultInstance.setLogLevel(Logger.Level.DEBUG)
}
@JvmStatic
val instance: FirebaseDatabase
get() = this.defaultInstance
}
FgService.kt
package com.ebhs.rtdbworker
import android.app.*
import android.content.Context
import android.content.Intent
import android.os.IBinder
import android.util.Log
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
class FgService : Service() {
companion object {
const val TAG = "RtdbWorker.FgService"
const val channelId = "fgService-channel"
const val channelName = "Foreground Service"
const val notificationTitle = "Foreground Service"
const val notificationText = "Sticky. Does nothing"
fun start(context: Context) {
val intent = Intent(context, FgService::class.java)
context.startForegroundService(intent)
}
fun stop(context: Context) {
val intent = Intent(context, FgService::class.java)
context.stopService(intent)
}
}
override fun onBind(intent: Intent): IBinder? {
return null
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
Log.d(TAG, "onStartCommand")
createNotificationChannel()
val notification = createNotification()
startForeground(1, notification)
return START_STICKY
}
override fun onCreate() {
Log.d(TAG, "onCreate")
super.onCreate()
}
override fun onDestroy() {
Log.d(TAG, "onDestroy")
super.onDestroy()
}
override fun onTaskRemoved(rootIntent: Intent?) {
Log.d(TAG, "onTaskRemoved")
super.onTaskRemoved(rootIntent)
}
private fun createNotificationChannel() {
val notMgr = NotificationManagerCompat.from(this)
val fsChannel = notMgr.getNotificationChannel(channelId)
if (fsChannel != null) {
return
}
val channel = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_LOW)
channel.enableVibration(false)
channel.setShowBadge(false)
notMgr.createNotificationChannel(channel)
}
private fun createNotification(): Notification {
val notificationIntent = Intent(this, MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0)
return NotificationCompat.Builder(this, channelId)
.setContentTitle(notificationTitle)
.setContentText(notificationText)
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentIntent(pendingIntent)
.setStyle(NotificationCompat.BigTextStyle().bigText(notificationText))
.build()
}
}
build.gradle dependencies
dependencies {
implementation 'androidx.core:core-ktx:1.6.0'
implementation 'androidx.appcompat:appcompat:1.3.1'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
implementation "androidx.work:work-runtime-ktx:2.4.0"
implementation 'com.google.firebase:firebase-database-ktx:20.0.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-play-services:1.5.1'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
Require Foreground_Service permission in manifest.xml
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
The firebase database project has only one node at \doc\id123 (See attached image)
Logcat and database:profile capture of the issue
rtdbworker.start1356_end1502.dbProfile.txt rtdbworker.start1356_end1502.logcat.txt
Issue Analytics
- State:
- Created 2 years ago
- Comments:17 (3 by maintainers)
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@aguatno Yes, that is correct. Just need to
Start ServiceandStart Worker. Then let them both continue to remain active in the background. I also manually disable battery optimisation for the app vis Settings (Not sure if this step is required)After sometime (don’t know exactly, but several hours), the issue will present itself.
For the Database, it doesn’t matter if any data exists at the doc path. As long as Database instance is enabled, and the rules/permission to the path is allowed. For my test project. I has left the Database rules in dev mode (allowed until a future date). And only have one record
https://user-images.githubusercontent.com/48874658/132966166-c693cc0f-1209-4c9a-b2de-044a87a4255b.JPG
Hi @argzdev
The error is still reproducible with
Firebase Database v20.0.3I noticed that the error occurs after the phone is unplugged from the pc.
My steps.
I left the app running and the device connected to the pc for about 2 to 2.5 hours, looking at logat output. Error did not happen. I unplugged the device from the pc. In about 30 min, the issue started occurring. To detect the issue when disconnected from pc. Start
firebase database:profile --raw, and monitor the counter. The issue will increases the counter by 2 every 2 minutes.When I connect the device back to the pc to check logcat, the error fixes. See logcat output below. Connected to pc around 1:21pm