Implement device-local featuregate overrides

src/lib/statsig/statsig.tsx

@@ -1,17 +1,17 @@
 import React from 'react'
 import {Platform} from 'react-native'
-import {AppState, AppStateStatus} from 'react-native'
+import {AppState, type AppStateStatus} from 'react-native'
 import {Statsig, StatsigProvider} from 'statsig-react-native-expo'
 
 import {BUNDLE_DATE, BUNDLE_IDENTIFIER, IS_TESTFLIGHT} from '#/lib/app-info'
 import {logger} from '#/logger'
-import {MetricEvents} from '#/logger/metrics'
+import {type MetricEvents} from '#/logger/metrics'
 import {isWeb} from '#/platform/detection'
 import * as persisted from '#/state/persisted'
 import {useSession} from '../../state/session'
 import {timeout} from '../async/timeout'
 import {useNonReactiveCallback} from '../hooks/useNonReactiveCallback'
-import {Gate} from './gates'
+import {type Gate} from './gates'
 
 const SDK_KEY = 'client-SXJakO39w9vIhl3D44u8UupyzFl4oZ2qPIkjwcvuPsV'
 
@@ -180,25 +180,26 @@ export function useGate(): (gateName: Gate, options?: GateOptions) => boolean {
 }
 
 /**
- * Debugging tool to override a gate. USE ONLY IN E2E TESTS!
+ * Tool to override a gate on the local device
  */
-export function useDangerousSetGate(): (
+export function useSetLocalGateOverride(): (
   gateName: Gate,
   value: boolean,
 ) => void {
   const cache = React.useContext(GateCache)
   if (!cache) {
     throw Error(
-      'useDangerousSetGate() cannot be called outside StatsigProvider.',
+      'useSetLocalOverride() cannot be called outside StatsigProvider.',
     )
   }
-  const dangerousSetGate = React.useCallback(
+  const setGate = React.useCallback(
     (gateName: Gate, value: boolean) => {
       cache.set(gateName, value)
+      persisted.write('gateOverrides', Object.fromEntries(cache.entries()))
     },
     [cache],
   )
-  return dangerousSetGate
+  return setGate
 }
 
 function toStatsigUser(did: string | undefined): StatsigUser {
@@ -286,11 +287,11 @@ export function Provider({children}: {children: React.ReactNode}) {
 
   // Have our own cache in front of Statsig.
   // This ensures the results remain stable until the active DID changes.
-  const [gateCache, setGateCache] = React.useState(() => new Map())
+  const [gateCache, setGateCache] = React.useState(() => createGateCache())
   const [prevDid, setPrevDid] = React.useState(did)
   if (did !== prevDid) {
     setPrevDid(did)
-    setGateCache(new Map())
+    setGateCache(createGateCache())
   }
 
   // Periodically poll Statsig to get the current rule evaluations for all stored accounts.
@@ -323,3 +324,7 @@ export function Provider({children}: {children: React.ReactNode}) {
     </GateCache.Provider>
   )
 }
+
+function createGateCache(): Map<string, boolean> {
+  return new Map(Object.entries(persisted.get('gateOverrides') || {}))
+}

src/screens/Settings/LabSettings/FeatureGateDialog.tsx

@@ -1,9 +1,11 @@
 import {useState} from 'react'
 import {View} from 'react-native'
+import * as Updates from 'expo-updates'
 import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
 import {type Gate, useGateDescriptions} from '#/lib/statsig/gates'
+import {useGate, useSetLocalGateOverride} from '#/lib/statsig/statsig'
 import {logger} from '#/logger'
 import {atoms as a, useTheme} from '#/alf'
 import {Button, ButtonIcon, ButtonText} from '#/components/Button'
@@ -14,6 +16,7 @@ import {
   EmojiSad_Stroke2_Corner0_Rounded as EmojiSad,
   EmojiSmile_Stroke2_Corner0_Rounded as EmojiSmile,
 } from '#/components/icons/Emoji'
+import {Loader} from '#/components/Loader'
 import {P, Text} from '#/components/Typography'
 
 enum FeedbackToken {
@@ -37,10 +40,20 @@ export function FeatureGateDialog({
 }) {
   const {_} = useLingui()
   const t = useTheme()
-
   const descriptions = useGateDescriptions()
+  const gateApi = useGate()
+  const setGateApi = useSetLocalGateOverride()
+
+  const [originalEnabled] = useState(() => gateApi(gate))
+  const [enabled, setEnabled] = useState(originalEnabled)
+  const [isRestarting, setIsRestarting] = useState(false)
   const desc = descriptions[gate]
 
+  const onToggleGate = v => {
+    setGateApi(gate, v)
+    setEnabled(v)
+  }
+
   if (!desc) {
     return null
   }
@@ -66,16 +79,36 @@ export function FeatureGateDialog({
               name="quoteposts"
               type="checkbox"
               label={_(msg`Tap to toggle this experiment.`)}
-              value={true}
-              onChange={_v => {}}
+              value={enabled}
+              onChange={onToggleGate}
               style={[a.justify_between]}>
               <Text style={[t.atoms.text_contrast_high]}>
-                <Trans>Enable on this device</Trans>
+                <Trans>Enabled on this device</Trans>
               </Text>
               <Toggle.Switch />
             </Toggle.Item>
           </View>
 
+          {enabled !== originalEnabled ? (
+            <Button
+              variant="solid"
+              color="primary"
+              size="large"
+              onPress={() => {
+                setIsRestarting(true)
+                Updates.reloadAsync()
+              }}
+              label={_(msg`Restart to apply changes`)}
+              disabled={isRestarting}>
+              <ButtonText>
+                <Trans>Restart to apply changes</Trans>
+              </ButtonText>
+              {isRestarting ? (
+                <Loader size="sm" style={[{color: 'white'}]} />
+              ) : null}
+            </Button>
+          ) : null}
+
           {desc.help ? (
             <>
               <Divider style={[a.my_lg]} />

src/screens/Settings/LabSettings/index.tsx

@@ -4,6 +4,7 @@ import {type NativeStackScreenProps} from '@react-navigation/native-stack'
 
 import {type CommonNavigatorParams} from '#/lib/routes/types'
 import {type Gate, useGateDescriptions} from '#/lib/statsig/gates'
+import {useGate} from '#/lib/statsig/statsig'
 import * as SettingsList from '#/screens/Settings/components/SettingsList'
 import {atoms as a, useTheme} from '#/alf'
 import {useDialogControl} from '#/components/Dialog'
@@ -41,7 +42,7 @@ export function LabSettingsScreen({}: Props) {
         </View>
         <SettingsList.Container>
           {gates.map(gate => (
-            <ExperimentButton key={gate} gate={gate} enabled={true} />
+            <ExperimentButton key={gate} gate={gate} />
           ))}
         </SettingsList.Container>
       </Layout.Content>
@@ -49,10 +50,12 @@ export function LabSettingsScreen({}: Props) {
   )
 }
 
-function ExperimentButton({gate, enabled}: {gate: Gate; enabled: boolean}) {
+function ExperimentButton({gate}: {gate: Gate}) {
   const t = useTheme()
   const ctrl = useDialogControl()
   const descriptions = useGateDescriptions()
+  const gateApi = useGate()
+  const enabled = gateApi(gate)
   return (
     <>
       <SettingsList.Divider />

src/state/persisted/schema.ts

@@ -127,6 +127,7 @@ const schema = z.object({
   mutedThreads: z.array(z.string()),
   trendingDisabled: z.boolean().optional(),
   trendingVideoDisabled: z.boolean().optional(),
+  gateOverrides: z.object({}).catchall(z.boolean()).optional(),
 })
 export type Schema = z.infer<typeof schema>
 
@@ -174,6 +175,7 @@ export const defaults: Schema = {
   subtitlesEnabled: true,
   trendingDisabled: false,
   trendingVideoDisabled: false,
+  gateOverrides: {},
 }
 
 export function tryParse(rawData: string): Schema | undefined {