[fenix] Close https://github.com/mozilla-mobile/fenix/issues/20267: Filter out network errors from Nimbus

app/src/main/java/org/mozilla/fenix/experiments/NimbusSetup.kt

@@ -13,19 +13,22 @@ import mozilla.components.service.nimbus.NimbusAppInfo
 import mozilla.components.service.nimbus.NimbusDisabled
 import mozilla.components.service.nimbus.NimbusServerSettings
 import mozilla.components.support.base.log.logger.Logger
+import org.mozilla.experiments.nimbus.internal.NimbusErrorException
 import org.mozilla.fenix.BuildConfig
 import org.mozilla.fenix.R
-import org.mozilla.fenix.components.isSentryEnabled
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.settings
 
 @Suppress("TooGenericExceptionCaught")
 fun createNimbus(context: Context, url: String?): NimbusApi {
-    val errorReporter: ((String, Throwable) -> Unit) = { message, e ->
+    val errorReporter: ((String, Throwable) -> Unit) = reporter@{ message, e ->
         Logger.error("Nimbus error: $message", e)
-        if (isSentryEnabled()) {
+
-            context.components.analytics.crashReporter.submitCaughtException(e)
+        if (e is NimbusErrorException && !e.isReportableError()) {
+            return@reporter
         }
+
+        context.components.analytics.crashReporter.submitCaughtException(e)
     }
     return try {
         // Eventually we'll want to use `NimbusDisabled` when we have no NIMBUS_ENDPOINT.
@@ -96,3 +99,17 @@ fun createNimbus(context: Context, url: String?): NimbusApi {
         NimbusDisabled()
     }
 }
+
+/**
+ * Classifies which errors we should forward to our crash reporter or not. We want to filter out the
+ * non-reportable ones if we know there is no reasonable action that we can perform.
+ *
+ * This fix should be upstreamed as part of: https://github.com/mozilla/application-services/issues/4333
+ */
+fun NimbusErrorException.isReportableError(): Boolean {
+    return when (this) {
+        is NimbusErrorException.RequestError,
+        is NimbusErrorException.ResponseError -> false
+        else -> true
+    }
+}

app/src/test/java/org/mozilla/fenix/experiments/NimbusSetupKtTest.kt

@@ -0,0 +1,28 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.experiments
+
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.mozilla.experiments.nimbus.internal.NimbusErrorException
+
+class NimbusSetupKtTest {
+    @Test
+    fun `WHEN error is reportable THEN return true`() {
+        val error = NimbusErrorException.IOError("bad error")
+
+        assertTrue(error.isReportableError())
+    }
+
+    @Test
+    fun `WHEN error is non-reportable THEN return false`() {
+        val error1 = NimbusErrorException.ResponseError("oops")
+        val error2 = NimbusErrorException.RequestError("oops")
+
+        assertFalse(error1.isReportableError())
+        assertFalse(error2.isReportableError())
+    }
+}