Persist in-app feature flags (dev-only feature) (#19619)

This commit improves in-app feature flags to persist what is currently only
stored in a Reagent atom by using RN Async Storage
https://reactnative.dev/docs/asyncstorage. This should make them more convenient
to use, which is a good thing overall for developers.

Additionally, there's now a top-right button in screen Settings > Feature Flags
that will reset the flags to the initial values obtained from environment
variables.

These in-app feature flags are exclusively available in debug builds in
Settings > Feature Flags, and only visible when flag ENABLE_QUO_PREVIEW is
enabled. There's no impact whatsoever in prod builds. A reminder that they are
not meant to be used by users (yet).

It's worth noting that RN has deprecated Async Storage and now recommends other
community solutions, but for a dev-only feature, I think it's fine.

src/status_im/contexts/preview/feature_flags/view.cljs

@@ -15,7 +15,9 @@
      :text-align :left
      :title      "Features Flags"
      :icon-name  :i/arrow-left
-     :on-press   #(rf/dispatch [:navigate-back])}]
+     :on-press   #(rf/dispatch [:navigate-back])
+     :right-side [{:icon-name :i/rotate
+                   :on-press  #(ff/reset-flags)}]}]
    (doall
     (for [context-name ff/feature-flags-categories
           :let         [context-flags (filter (fn [[k]]
@@ -36,4 +38,3 @@
              :container-style {:margin-right 8}
              :on-change       #(ff/toggle flag)}]
            [quo/text (second (string/split (name flag) "."))]]))]))])
-

src/status_im/core.cljs

@@ -21,10 +21,10 @@
     [status-im.contexts.profile.push-notifications.events :as notifications]
     [status-im.contexts.shell.jump-to.state :as shell.state]
     [status-im.contexts.shell.jump-to.utils :as shell.utils]
+    [status-im.feature-flags :as ff]
     [status-im.navigation.core :as navigation]
     status-im.contexts.wallet.signals
     status-im.events
-    status-im.navigation.core
     [status-im.setup.dev :as dev]
     [status-im.setup.global-error :as global-error]
     [status-im.setup.interceptors :as interceptors]
@@ -63,6 +63,9 @@
   (async-storage/get-item :selected-stack-id #(shell.utils/change-selected-stack-id % nil nil))
   (async-storage/get-item :screen-height #(reset! shell.state/screen-height %))
 
+  (when config/quo-preview-enabled?
+    (ff/load-flags))
+
   (dev/setup)
   (log/info "hermesEnabled ->" (is-hermes))
 

src/status_im/feature_flags.cljs

@@ -1,6 +1,7 @@
 (ns status-im.feature-flags
   (:require
     [clojure.string :as string]
+    [react-native.async-storage :as async-storage]
     [react-native.config :as config]
     [reagent.core :as reagent]))
 
@@ -8,8 +9,7 @@
   [k]
   (= "1" (config/get-config k)))
 
-(defonce ^:private feature-flags-config
+(def ^:private initial-flags
-  (reagent/atom
   {::community.edit-account-selection   (enabled-in-env? :FLAG_EDIT_ACCOUNT_SELECTION_ENABLED)
    ::wallet.activities                  (enabled-in-env? :FLAG_WALLET_ACTIVITY_ENABLED)
    ::wallet.assets-modal-hide           (enabled-in-env? :FLAG_ASSETS_MODAL_HIDE)
@@ -21,7 +21,10 @@
    ::wallet.import-private-key          (enabled-in-env? :FLAG_IMPORT_PRIVATE_KEY_ENABLED)
    ::wallet.long-press-watch-only-asset (enabled-in-env? :FLAG_LONG_PRESS_WATCH_ONLY_ASSET_ENABLED)
    ::wallet.swap                        (enabled-in-env? :FLAG_SWAP_ENABLED)
-    ::wallet.wallet-connect              (enabled-in-env? :FLAG_WALLET_CONNECT_ENABLED)}))
+   ::wallet.wallet-connect              (enabled-in-env? :FLAG_WALLET_CONNECT_ENABLED)})
+
+(defonce ^:private feature-flags-config
+  (reagent/atom initial-flags))
 
 (defn feature-flags [] @feature-flags-config)
 
@@ -37,7 +40,28 @@
 
 (defn toggle
   [flag]
-  (swap! feature-flags-config update flag not))
+  (let [new-flags (update @feature-flags-config flag not)]
+    (async-storage/set-item!
+     :feature-flags
+     new-flags
+     (fn []
+       (reset! feature-flags-config new-flags)))))
+
+(defn load-flags
+  []
+  (async-storage/get-item
+   :feature-flags
+   (fn [flags]
+     (when flags
+       (reset! feature-flags-config flags)))))
+
+(defn reset-flags
+  []
+  (async-storage/set-item!
+   :feature-flags
+   initial-flags
+   (fn []
+     (reset! feature-flags-config initial-flags))))
 
 (defn alert
   [flag action]

test/jest/jestSetup.js

@@ -1,7 +1,7 @@
 const WebSocket = require('ws');
 const { NativeModules } = require('react-native');
 
-require('@react-native-async-storage/async-storage/jest/async-storage-mock');
+mockAsyncStorage = require('@react-native-async-storage/async-storage/jest/async-storage-mock');
 require('react-native-gesture-handler/jestSetup');
 require('react-native-reanimated/src/reanimated2/jestUtils').setUpTests();