Refine cleaning routing rules

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

@@ -58,5 +58,6 @@ class App : Application() {
     val masquerade get() = pref.getBoolean("service.masquerade", true)
     val dhcpWorkaround get() = pref.getBoolean("service.dhcpWorkaround", false)
 
-    val cleanRoutings = Event0()
+    val onPreCleanRoutings = Event0()
+    val onRoutingsCleaned = Event0()
 }

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

@@ -10,14 +10,13 @@ class LocalOnlyInterfaceManager(val downstream: String) {
     private var routing: Routing? = null
 
     init {
-        app.cleanRoutings[this] = this::clean
+        app.onPreCleanRoutings[this] = { routing?.stop() }
+        app.onRoutingsCleaned[this] = this::clean
         initRouting()
     }
 
     private fun clean() {
-        val routing = routing ?: return
-        routing.stop()
-        initRouting(routing.hostAddress)
+        initRouting((routing ?: return).hostAddress)
     }
 
     private fun initRouting(owner: InterfaceAddress? = null) {
@@ -42,7 +41,8 @@ class LocalOnlyInterfaceManager(val downstream: String) {
     }
 
     fun stop() {
-        app.cleanRoutings -= this
+        app.onPreCleanRoutings -= this
+        app.onRoutingsCleaned -= this
         routing?.revert()
     }
 }

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

@@ -40,6 +40,7 @@ class SettingsPreferenceFragment : PreferenceFragmentCompat() {
             boot.isChecked = BootReceiver.enabled
         } else boot.parent!!.removePreference(boot)
         findPreference("service.clean").setOnPreferenceClickListener {
+            app.onPreCleanRoutings()
             val cleaned = try {
                 Routing.clean()
                 true
@@ -48,7 +49,7 @@ class SettingsPreferenceFragment : PreferenceFragmentCompat() {
                 SmartSnackbar.make(e).show()
                 false
             }
-            if (cleaned) app.cleanRoutings()
+            if (cleaned) app.onRoutingsCleaned()
             true
         }
         findPreference("misc.logcat").setOnPreferenceClickListener {

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

@@ -45,12 +45,10 @@ class TetheringService : IpNeighbourMonitoringService() {
             if (!receiverRegistered) {
                 receiverRegistered = true
                 registerReceiver(receiver, IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED))
-                app.cleanRoutings[this] = {
-                    synchronized(routings) {
-                        for (iface in routings.keys) routings.put(iface, null)?.stop()
-                        updateRoutingsLocked()
-                    }
+                app.onPreCleanRoutings[this] = {
+                    synchronized(routings) { for (iface in routings.keys) routings.put(iface, null)?.stop() }
                 }
+                app.onRoutingsCleaned[this] = { synchronized(routings) { updateRoutingsLocked() } }
                 IpNeighbourMonitor.registerCallback(this)
             }
             val disableIpv6 = app.pref.getBoolean("service.disableIpv6", false)
@@ -110,7 +108,8 @@ class TetheringService : IpNeighbourMonitoringService() {
     private fun unregisterReceiver() {
         if (receiverRegistered) {
             unregisterReceiver(receiver)
-            app.cleanRoutings -= this
+            app.onPreCleanRoutings -= this
+            app.onRoutingsCleaned -= this
             IpNeighbourMonitor.unregisterCallback(this)
             receiverRegistered = false
         }

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

@@ -61,13 +61,17 @@ class Subrouting(private val parent: Routing, priority: Int, val upstream: Strin
     private val subroutes = HashMap<InetAddress, Subroute>()
 
     init {
+        Timber.d("Subrouting initialized from %s to %s", parent.downstream, upstream)
         IpNeighbourMonitor.registerCallback(this)
     }
 
     /**
      * Unregister client listener. This should be always called even after clean.
      */
-    override fun close() = IpNeighbourMonitor.unregisterCallback(this)
+    override fun close() {
+        IpNeighbourMonitor.unregisterCallback(this)
+        Timber.d("Subrouting closed from %s to %s", parent.downstream, upstream)
+    }
 
     override fun onIpNeighbourAvailable(neighbours: List<IpNeighbour>) = synchronized(parent) {
         val toRemove = HashSet(subroutes.keys)