Ajout tâche de mise à jour en arrière-plan

client/utils/background.ts

@@ -0,0 +1,42 @@
+import * as BackgroundFetch from 'expo-background-fetch'
+import * as TaskManager from 'expo-task-manager'
+import { Platform } from 'react-native'
+import { useEffect } from 'react'
+
+const BACKGROUND_FETCH_TASK = "background-fetch"
+const BACKGROUND_FETCH_INTERVAL = 20
+
+async function backgroundUpdate() {
+  async () => {
+    const now = Date.now()
+    console.log(`Got background fetch call at date: ${new Date(now).toISOString()}`)
+    // Be sure to return the successful result type!
+    return BackgroundFetch.BackgroundFetchResult.NewData
+  }
+}
+
+TaskManager.defineTask(BACKGROUND_FETCH_TASK, backgroundUpdate)
+  
+export async function startBackgroundFetchService(): Promise<void | (() => void)> {
+  if (Platform.OS === "web") {
+    const interval = setInterval(backgroundUpdate, BACKGROUND_FETCH_INTERVAL)
+    return () => clearInterval(interval)
+  }
+
+  if (await TaskManager.isTaskRegisteredAsync(BACKGROUND_FETCH_TASK))
+    return async () => await BackgroundFetch.unregisterTaskAsync(BACKGROUND_FETCH_TASK)
+
+  await BackgroundFetch.registerTaskAsync(BACKGROUND_FETCH_TASK, {
+    minimumInterval: BACKGROUND_FETCH_INTERVAL,
+    stopOnTerminate: false,
+    startOnBoot: true,
+  })
+
+  return async () => await BackgroundFetch.unregisterTaskAsync(BACKGROUND_FETCH_TASK)
+}
+
+export const useStartBackgroundFetchServiceEffect = () => useEffect(() => {
+  let cleanup: void | (() => void) = () => {}
+  startBackgroundFetchService().then(result => cleanup = result)
+  return cleanup
+}, [])