For #945 - Disable leanplum when we stop telemetry

app/src/main/java/org/mozilla/fenix/FenixApplication.kt

@@ -48,7 +48,9 @@ open class FenixApplication : Application() {
 
         setupLeakCanary()
         loadExperiments()
-        components.analytics.metrics.start()
+        if (Settings.getInstance(this).isTelemetryEnabled) {
+            components.analytics.metrics.start()
+        }
     }
 
     protected open fun setupLeakCanary() {

app/src/main/java/org/mozilla/fenix/components/metrics/AdjustMetricsService.kt

@@ -35,10 +35,14 @@ class AdjustMetricsService(private val application: Application) : MetricsServic
         config.setLogLevel(LogLevel.SUPRESS)
 
         Adjust.onCreate(config)
-
+        Adjust.setEnabled(true)
         application.registerActivityLifecycleCallbacks(AdjustLifecycleCallbacks())
     }
 
+    override fun stop() {
+        Adjust.setEnabled(false)
+    }
+
     // We're not currently sending events directly to Adjust
     override fun track(event: Event) { }
     override fun shouldTrack(event: Event): Boolean = false

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -86,6 +86,10 @@ class GleanMetricsService(private val context: Context) : MetricsService {
         }
     }
 
+    override fun stop() {
+        Glean.setUploadEnabled(false)
+    }
+
     override fun track(event: Event) {
         event.wrapper?.track(event)
     }

app/src/main/java/org/mozilla/fenix/components/metrics/LeanplumMetricsService.kt

@@ -8,6 +8,7 @@ import android.util.Log
 import com.leanplum.Leanplum
 import com.leanplum.LeanplumActivityHelper
 import com.leanplum.annotations.Parser
+import com.leanplum.internal.LeanplumInternal
 import org.mozilla.fenix.BuildConfig
 import org.mozilla.fenix.utils.Settings
 
@@ -79,6 +80,7 @@ class LeanplumMetricsService(private val application: Application) : MetricsServ
             }
         }
 
+        Leanplum.setIsTestModeEnabled(false)
         Leanplum.setApplicationContext(application)
         Parser.parseVariables(application)
 
@@ -86,6 +88,20 @@ class LeanplumMetricsService(private val application: Application) : MetricsServ
         Leanplum.start(application)
     }
 
+    override fun stop() {
+        // As written in LeanPlum SDK documentation, "This prevents Leanplum from communicating with the server."
+        // as this "isTestMode" flag is checked before LeanPlum SDK does anything.
+        // Also has the benefit effect of blocking the display of already downloaded messages.
+        // The reverse of this - setIsTestModeEnabled(false) must be called before trying to init
+        // LP in the same session.
+        Leanplum.setIsTestModeEnabled(true)
+
+        // This is just to allow restarting LP and it's functionality in the same app session
+        // as LP stores it's state internally and check against it
+        LeanplumInternal.setCalledStart(false)
+        LeanplumInternal.setHasStarted(false)
+    }
+
     override fun track(event: Event) {
         event.name?.also {
             Leanplum.track(it, event.extras)

app/src/main/java/org/mozilla/fenix/components/metrics/Metrics.kt

@@ -117,6 +117,7 @@ private fun Fact.toEvent(): Event? = when (Pair(component, item)) {
 
 interface MetricsService {
     fun start()
+    fun stop()
     fun track(event: Event)
     fun shouldTrack(event: Event): Boolean
 }
@@ -141,6 +142,13 @@ class Metrics(private val services: List<MetricsService>, private val isTelemetr
         initialized = true
     }
 
+    fun stop() {
+        if (!initialized) { return }
+
+        services.forEach { it.stop() }
+        initialized = false
+    }
+
     fun track(event: Event) {
         if (BuildConfig.TELEMETRY && !isTelemetryEnabled.invoke() && !initialized) { return }
 

app/src/main/java/org/mozilla/fenix/settings/DataChoicesFragment.kt

@@ -9,6 +9,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreference
 import org.mozilla.fenix.R
+import org.mozilla.fenix.ext.requireComponents
 import org.mozilla.fenix.utils.Settings
 
 class DataChoicesFragment : PreferenceFragmentCompat() {
@@ -17,6 +18,18 @@ class DataChoicesFragment : PreferenceFragmentCompat() {
         super.onCreate(savedInstanceState)
         (activity as AppCompatActivity).title = getString(R.string.preferences_data_choices)
         (activity as AppCompatActivity).supportActionBar?.show()
+
+        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener { sharedPreferences, key ->
+            when (key) {
+                getString(R.string.pref_key_telemetry) -> {
+                    if (sharedPreferences.getBoolean(key, Settings.getInstance(requireContext()).isTelemetryEnabled)) {
+                        requireComponents.analytics.metrics.start()
+                    } else {
+                        requireComponents.analytics.metrics.stop()
+                    }
+                }
+            }
+        }
     }
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {