WIP revamp

src/analytics/identifiers/session.ts

@@ -0,0 +1,40 @@
+import {useEffect, useState} from 'react'
+import uuid from 'react-native-uuid'
+
+import {onAppStateChange} from '#/lib/appState'
+import {isSessionIdExpired} from '#/analytics/identifiers/util'
+import {device} from '#/storage'
+
+let sessionId = (() => {
+  const existing = device.get(['nativeSessionId'])
+  const lastEvent = device.get(['nativeSessionIdLastEventAt'])
+  const id = existing && !isSessionIdExpired(lastEvent) ? existing : uuid.v4()
+  device.set(['nativeSessionId'], id)
+  return id
+})()
+
+export function getInitialSessionId() {
+  return sessionId
+}
+
+export function useSessionId() {
+  const [id, setId] = useState(() => sessionId)
+
+  useEffect(() => {
+    const sub = onAppStateChange(state => {
+      if (state === 'active') {
+        const lastEvent = device.get(['nativeSessionIdLastEventAt'])
+        if (isSessionIdExpired(lastEvent)) {
+          sessionId = uuid.v4()
+          device.set(['nativeSessionId'], sessionId)
+          setId(sessionId)
+        }
+      } else {
+        device.set(['nativeSessionIdLastEventAt'], Date.now())
+      }
+    })
+    return () => sub.remove()
+  }, [])
+
+  return id
+}