upd: routing dev

src/frontend/hooks/usePresence.ts

@@ -0,0 +1,42 @@
+import { useEffect, useRef, useState } from 'react'
+import { useSession } from './useAuth'
+
+export function usePresence() {
+  const { data } = useSession()
+  const [onlineUserIds, setOnlineUserIds] = useState<string[]>([])
+  const wsRef = useRef<WebSocket | null>(null)
+  const reconnectTimer = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
+
+  useEffect(() => {
+    if (!data?.user) return
+
+    function connect() {
+      const proto = location.protocol === 'https:' ? 'wss' : 'ws'
+      const ws = new WebSocket(`${proto}://${location.host}/ws/presence`)
+      wsRef.current = ws
+
+      ws.onmessage = (e) => {
+        const msg = JSON.parse(e.data)
+        if (msg.type === 'presence') setOnlineUserIds(msg.online)
+      }
+      ws.onclose = () => {
+        wsRef.current = null
+        reconnectTimer.current = setTimeout(connect, 3000)
+      }
+      ws.onerror = () => ws.close()
+    }
+
+    connect()
+
+    return () => {
+      clearTimeout(reconnectTimer.current)
+      if (wsRef.current) {
+        wsRef.current.onclose = null
+        wsRef.current.close()
+        wsRef.current = null
+      }
+    }
+  }, [data?.user?.id, data?.user])
+
+  return { onlineUserIds }
+}