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146 lines
6.4 KiB
Kotlin
146 lines
6.4 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.experiments
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import android.content.Context
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import android.net.Uri
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import mozilla.components.service.nimbus.Nimbus
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import mozilla.components.service.nimbus.NimbusApi
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import mozilla.components.service.nimbus.NimbusAppInfo
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import mozilla.components.service.nimbus.NimbusDisabled
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import mozilla.components.service.nimbus.NimbusServerSettings
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import mozilla.components.support.base.log.logger.Logger
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import org.mozilla.experiments.nimbus.NimbusInterface
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import org.mozilla.experiments.nimbus.internal.EnrolledExperiment
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import org.mozilla.experiments.nimbus.internal.NimbusException
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import org.mozilla.experiments.nimbus.joinOrTimeout
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import org.mozilla.fenix.BuildConfig
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import org.mozilla.fenix.R
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import org.mozilla.fenix.ext.components
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import org.mozilla.fenix.ext.settings
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import org.mozilla.fenix.nimbus.FxNimbus
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import org.mozilla.fenix.perf.runBlockingIncrement
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/**
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* Fenix specific observer of Nimbus events.
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*
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* The generated code `FxNimbus` provides a cache which should be invalidated
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* when the experiments recipes are updated.
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*/
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private val observer = object : NimbusInterface.Observer {
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override fun onUpdatesApplied(updated: List<EnrolledExperiment>) {
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FxNimbus.invalidateCachedValues()
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}
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}
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/**
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* The maximum amount of time the app launch will be blocked to load experiments from disk.
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*
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* ⚠️ This value was decided from analyzing the Focus metrics (nimbus_initial_fetch) for the ideal
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* timeout. We should NOT change this value without collecting more metrics first.
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*/
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private const val TIME_OUT_LOADING_EXPERIMENT_FROM_DISK_MS = 200L
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@Suppress("TooGenericExceptionCaught")
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fun createNimbus(context: Context, url: String?): NimbusApi {
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// Once application-services has switched to using the new
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// error reporting system, we may not need this anymore.
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// https://mozilla-hub.atlassian.net/browse/EXP-2868
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val errorReporter: ((String, Throwable) -> Unit) = reporter@{ message, e ->
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Logger.error("Nimbus error: $message", e)
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if (e is NimbusException && !e.isReportableError()) {
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return@reporter
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}
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context.components.analytics.crashReporter.submitCaughtException(e)
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}
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// Eventually we'll want to use `NimbusDisabled` when we have no NIMBUS_ENDPOINT.
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// but we keep this here to not mix feature flags and how we configure Nimbus.
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val serverSettings = if (!url.isNullOrBlank()) {
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if (context.settings().nimbusUsePreview) {
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NimbusServerSettings(url = Uri.parse(url), collection = "nimbus-preview")
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} else {
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NimbusServerSettings(url = Uri.parse(url))
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}
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} else {
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null
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}
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val isFirstNimbusRun = context.settings().isFirstNimbusRun
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if (isFirstNimbusRun) {
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context.settings().isFirstNimbusRun = false
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}
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// The name "fenix" here corresponds to the app_name defined for the family of apps
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// that encompasses all of the channels for the Fenix app. This is defined upstream in
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// the telemetry system. For more context on where the app_name come from see:
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// https://probeinfo.telemetry.mozilla.org/v2/glean/app-listings
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// and
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// https://github.com/mozilla/probe-scraper/blob/master/repositories.yaml
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val appInfo = NimbusAppInfo(
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appName = "fenix",
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// Note: Using BuildConfig.BUILD_TYPE is important here so that it matches the value
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// passed into Glean. `Config.channel.toString()` turned out to be non-deterministic
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// and would mostly produce the value `Beta` and rarely would produce `beta`.
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channel = BuildConfig.BUILD_TYPE.let { if (it == "debug") "developer" else it },
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customTargetingAttributes = mapOf(
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"isFirstRun" to isFirstNimbusRun.toString(),
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),
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)
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return try {
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Nimbus(context, appInfo, serverSettings, errorReporter).apply {
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// We register our own internal observer for housekeeping the Nimbus SDK and
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// generated code.
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register(observer)
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// Apply any experiment recipes we downloaded last time, or
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// if this is the first time, we load the ones bundled in the res/raw
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// directory.
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val job = if (isFirstNimbusRun || url.isNullOrBlank()) {
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applyLocalExperiments(R.raw.initial_experiments)
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} else {
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applyPendingExperiments()
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}
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// We always want initialize Nimbus to happen ASAP and before any features (engine/UI)
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// have been initialized. For that reason, we use runBlocking here to avoid
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// inconsistency in the experiments.
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// We can safely do this because Nimbus does most of its work on background threads,
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// including the loading the initial experiments from disk. For this reason, we have a
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// `joinOrTimeout` to limit the blocking until TIME_OUT_LOADING_EXPERIMENT_FROM_DISK_MS.
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runBlockingIncrement {
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// We only read from disk when loading first-run experiments. This is the only time
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// that we should join and block. Otherwise, we don't want to wait.
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job.joinOrTimeout(TIME_OUT_LOADING_EXPERIMENT_FROM_DISK_MS)
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}
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// By now, on this thread, we have a fully initialized Nimbus object, ready for use:
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// * we gave a 200ms timeout to the loading of a file from res/raw
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// * on completion or cancellation, applyPendingExperiments or initialize was
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// called, and this thread waited for that to complete.
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}
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} catch (e: Throwable) {
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// Something went wrong. We'd like not to, but stability of the app is more important than
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// failing fast here.
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errorReporter("Failed to initialize Nimbus", e)
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NimbusDisabled(context)
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}
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}
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/**
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* Classifies which errors we should forward to our crash reporter or not. We want to filter out the
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* non-reportable ones if we know there is no reasonable action that we can perform.
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*
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* This fix should be upstreamed as part of: https://github.com/mozilla/application-services/issues/4333
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*/
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fun NimbusException.isReportableError(): Boolean {
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return when (this) {
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is NimbusException.RequestException,
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is NimbusException.ResponseException,
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-> false
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else -> true
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}
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}
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