Use in-process listener to ensure callback order

mobile/src/main/java/be/mygod/vpnhotspot/RoutingManager.kt

@@ -6,14 +6,12 @@ import androidx.core.os.BuildCompat
 import be.mygod.vpnhotspot.App.Companion.app
 import be.mygod.vpnhotspot.net.Routing
 import be.mygod.vpnhotspot.net.TetherType
-import be.mygod.vpnhotspot.net.TetheringManager
 import be.mygod.vpnhotspot.net.wifi.WifiDoubleLock
 import be.mygod.vpnhotspot.widget.SmartSnackbar
 import timber.log.Timber
 import java.net.NetworkInterface
 
-abstract class RoutingManager(private val caller: Any, val downstream: String,
+abstract class RoutingManager(private val caller: Any, val downstream: String, private val forceWifi: Boolean = false) {
-                              private val forceWifi: Boolean = false) : TetheringManager.TetheringEventCallback {
     companion object {
         private const val KEY_MASQUERADE_MODE = "service.masqueradeMode"
         var masqueradeMode: Routing.MasqueradeMode
@@ -63,7 +61,13 @@ abstract class RoutingManager(private val caller: Any, val downstream: String,
     fun start() = when (val other = active.putIfAbsent(downstream, this)) {
         null -> {
             if (isWifi) WifiDoubleLock.acquire(this)
-            if (!forceWifi && BuildCompat.isAtLeastR()) TetheringManager.registerTetheringEventCallback(null, this)
+            if (!forceWifi && BuildCompat.isAtLeastR()) TetherType.listener[this] = {
+                val isWifiNow = TetherType.ofInterface(downstream).isWifi
+                if (isWifi != isWifiNow) {
+                    if (isWifi) WifiDoubleLock.release(this) else WifiDoubleLock.acquire(this)
+                    isWifi = isWifiNow
+                }
+            }
             initRouting()
         }
         this -> true    // already started
@@ -72,13 +76,6 @@ abstract class RoutingManager(private val caller: Any, val downstream: String,
 
     open fun ifaceHandler(iface: NetworkInterface) { }
 
-    override fun onTetherableInterfaceRegexpsChanged() {
-        val isWifiNow = TetherType.ofInterface(downstream).isWifi
-        if (isWifi == isWifiNow) return
-        if (isWifi) WifiDoubleLock.release(this) else WifiDoubleLock.acquire(this)
-        isWifi = isWifiNow
-    }
-
     private fun initRouting() = try {
         routing = Routing(caller, downstream, this::ifaceHandler).apply {
             try {
@@ -100,7 +97,7 @@ abstract class RoutingManager(private val caller: Any, val downstream: String,
 
     fun stop() {
         if (active.remove(downstream, this)) {
-            if (!forceWifi && BuildCompat.isAtLeastR()) TetheringManager.unregisterTetheringEventCallback(this)
+            if (!forceWifi && BuildCompat.isAtLeastR()) TetherType.listener -= this
             if (isWifi) WifiDoubleLock.release(this)
             routing?.revert()
         }

mobile/src/main/java/be/mygod/vpnhotspot/client/ClientsFragment.kt

@@ -30,7 +30,7 @@ import be.mygod.vpnhotspot.Empty
 import be.mygod.vpnhotspot.R
 import be.mygod.vpnhotspot.databinding.FragmentClientsBinding
 import be.mygod.vpnhotspot.databinding.ListitemClientBinding
-import be.mygod.vpnhotspot.net.TetheringManager
+import be.mygod.vpnhotspot.net.TetherType
 import be.mygod.vpnhotspot.net.monitor.IpNeighbourMonitor
 import be.mygod.vpnhotspot.net.monitor.TrafficRecorder
 import be.mygod.vpnhotspot.room.AppDatabase
@@ -47,7 +47,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.text.NumberFormat
 
-class ClientsFragment : Fragment(), TetheringManager.TetheringEventCallback {
+class ClientsFragment : Fragment() {
     @Parcelize
     data class NicknameArg(val mac: Long, val nickname: CharSequence) : Parcelable
     class NicknameDialogFragment : AlertDialogFragment<NicknameArg, Empty>() {
@@ -230,7 +230,8 @@ class ClientsFragment : Fragment(), TetheringManager.TetheringEventCallback {
     }
 
     override fun onStart() {
-        if (BuildCompat.isAtLeastR()) TetheringManager.registerTetheringEventCallback(null, this)
+        // icon might be changed due to TetherType changes
+        if (BuildCompat.isAtLeastR()) TetherType.listener[this] = { adapter.notifyItemRangeChanged(0, adapter.size) }
         super.onStart()
         // we just put these two thing together as this is the only place we need to use this event for now
         TrafficRecorder.foregroundListeners[this] = adapter::updateTraffic
@@ -244,11 +245,6 @@ class ClientsFragment : Fragment(), TetheringManager.TetheringEventCallback {
     override fun onStop() {
         TrafficRecorder.foregroundListeners -= this
         super.onStop()
-        if (BuildCompat.isAtLeastR()) TetheringManager.unregisterTetheringEventCallback(this)
+        if (BuildCompat.isAtLeastR()) TetherType.listener -= this
-    }
-
-    override fun onTetherableInterfaceRegexpsChanged() {
-        // icon might be changed due to TetherType changes
-        adapter.notifyItemRangeChanged(0, adapter.size)
     }
 }

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt

@@ -38,7 +38,7 @@ import java.lang.reflect.InvocationTargetException
 import java.net.NetworkInterface
 import java.net.SocketException
 
-class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClickListener, TetheringManager.TetheringEventCallback {
+class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClickListener {
     companion object {
         const val START_REPEATER = 4
         const val START_LOCAL_ONLY_HOTSPOT = 1
@@ -255,17 +255,15 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
             lifecycleScope.launchWhenStarted { adapter.notifyInterfaceChanged() }
         }
         requireContext().registerReceiver(receiver, IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED))
-        if (BuildCompat.isAtLeastR()) TetheringManager.registerTetheringEventCallback(null, this)
+        if (BuildCompat.isAtLeastR()) TetherType.listener[this] = {
+            lifecycleScope.launchWhenStarted { adapter.notifyTetherTypeChanged() }
+        }
     }
 
     override fun onServiceDisconnected(name: ComponentName?) {
         (binder ?: return).routingsChanged -= this
         binder = null
-        if (BuildCompat.isAtLeastR()) TetheringManager.unregisterTetheringEventCallback(this)
+        if (BuildCompat.isAtLeastR()) TetherType.listener -= this
         requireContext().unregisterReceiver(receiver)
     }
-
-    override fun onTetherableInterfaceRegexpsChanged() {
-        lifecycleScope.launchWhenStarted { adapter.notifyTetherTypeChanged() }
-    }
 }

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringTileService.kt

@@ -26,8 +26,7 @@ import java.io.IOException
 import java.lang.reflect.InvocationTargetException
 
 @RequiresApi(24)
-sealed class TetheringTileService : KillableTileService(), TetheringManager.StartTetheringCallback,
+sealed class TetheringTileService : KillableTileService(), TetheringManager.StartTetheringCallback {
-        TetheringManager.TetheringEventCallback {
     protected val tileOff by lazy { Icon.createWithResource(application, icon) }
     protected val tileOn by lazy { Icon.createWithResource(application, R.drawable.ic_quick_settings_tile_on) }
 
@@ -52,12 +51,12 @@ sealed class TetheringTileService : KillableTileService(), TetheringManager.Star
         // we need to initialize tethered ASAP for onClick, which is not achievable using registerTetheringEventCallback
         tethered = registerReceiver(receiver, IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED))
                 ?.tetheredIfaces
-        if (BuildCompat.isAtLeastR()) TetheringManager.registerTetheringEventCallback(null, this)
+        if (BuildCompat.isAtLeastR()) TetherType.listener[this] = this::updateTile
         updateTile()
     }
 
     override fun onStopListening() {
-        if (BuildCompat.isAtLeastR()) TetheringManager.unregisterTetheringEventCallback(this)
+        if (BuildCompat.isAtLeastR()) TetherType.listener -= this
         unregisterReceiver(receiver)
         stopAndUnbind(this)
         super.onStopListening()
@@ -132,7 +131,6 @@ sealed class TetheringTileService : KillableTileService(), TetheringManager.Star
         error?.let { Toast.makeText(this, TetheringManager.tetherErrorMessage(it), Toast.LENGTH_LONG).show() }
         updateTile()
     }
-    override fun onTetherableInterfaceRegexpsChanged() = updateTile()
 
     class Wifi : TetheringTileService() {
         override val labelString get() = R.string.tethering_manage_wifi

mobile/src/main/java/be/mygod/vpnhotspot/net/TetherType.kt

@@ -5,6 +5,7 @@ import androidx.annotation.RequiresApi
 import androidx.core.os.BuildCompat
 import be.mygod.vpnhotspot.App.Companion.app
 import be.mygod.vpnhotspot.R
+import be.mygod.vpnhotspot.util.Event0
 import java.util.regex.Pattern
 
 enum class TetherType {
@@ -36,6 +37,9 @@ enum class TetherType {
         private val ethernetRegex: Pattern?
         private var requiresUpdate = true
 
+        @RequiresApi(30)    // unused on lower APIs
+        val listener = Event0()
+
         private fun Pair<String?, Resources>.getRegexs(name: String) = second
                 .getStringArray(second.getIdentifier(name, "array", first))
                 .filterNotNull()
@@ -56,6 +60,7 @@ enum class TetherType {
         @RequiresApi(30)
         override fun onTetherableInterfaceRegexpsChanged() {
             requiresUpdate = true
+            listener()
         }
 
         /**