Corrige lentidão do frontend com múltiplos clientes simultâneos

---

- Substituída consulta individual por stream (supervisorctl status {p}-{id} × 5) por uma única chamada supervisorctl status que retorna todos os programas de uma vez, com cache de 3s em fetchAllStatuses();
- Adicionado endpoint GET /api/streams/statuses que retorna os statuses de todos os streams em uma resposta batch;
- Frontend alterado para usar o endpoint batch em vez de N requests paralelos por ciclo de polling;
- Token de sessão HMAC-SHA256 em auth.ts agora é computado uma vez e cacheado no módulo, eliminando operações de crypto a cada requisição;
- Rolling session no middleware limitado a rotas de página, removendo overhead de Set-Cookie em respostas de API e HLS;

---

src/app/api/streams/statuses/route.ts

@@ -0,0 +1,6 @@
+import { NextResponse } from "next/server"
+import { getAllStreamStatuses } from "@/lib/supervisor"
+
+export async function GET() {
+  return NextResponse.json(getAllStreamStatuses())
+}

src/app/page.tsx

@@ -135,14 +135,9 @@ export default function GalleryPage() {
 
   const fetchStatuses = useCallback(async (list: Stream[]) => {
     if (list.length === 0) return
-    const results = await Promise.all(
-      list.map(async (s) => {
-        const res = await fetch(`/api/streams/${s.id}/status`)
-        const data = await res.json()
-        return [s.id, data] as const
-      })
-    )
-    setStatuses(Object.fromEntries(results))
+    const res = await fetch("/api/streams/statuses")
+    const data: Record<string, Record<string, string>> = await res.json()
+    setStatuses(data)
   }, [])
 
   useEffect(() => {

src/lib/auth.ts

@@ -3,17 +3,19 @@
 export const AUTH_ENABLED = !!(process.env.AUTH_USER && process.env.AUTH_PASS)
 export const COOKIE_NAME = "ds_session"
 
+// Cached promise — token is deterministic (env vars never change at runtime)
+let _tokenCache: Promise<string> | null = null
+
 // HMAC-SHA256(user, key=pass) — deterministic, no in-memory state, survives restarts
 // Works in both Edge (SubtleCrypto) and Node.js runtime
-export async function computeSessionToken(): Promise<string> {
+export function computeSessionToken(): Promise<string> {
+  if (_tokenCache) return _tokenCache
   const user = process.env.AUTH_USER ?? ""
   const pass = process.env.AUTH_PASS ?? ""
   const enc = new TextEncoder()
-  const key = await globalThis.crypto.subtle.importKey(
-    "raw", enc.encode(pass),
-    { name: "HMAC", hash: "SHA-256" },
-    false, ["sign"]
-  )
-  const sig = await globalThis.crypto.subtle.sign("HMAC", key, enc.encode(user))
-  return Array.from(new Uint8Array(sig), b => b.toString(16).padStart(2, "0")).join("")
+  _tokenCache = globalThis.crypto.subtle
+    .importKey("raw", enc.encode(pass), { name: "HMAC", hash: "SHA-256" }, false, ["sign"])
+    .then(key => globalThis.crypto.subtle.sign("HMAC", key, enc.encode(user)))
+    .then(sig => Array.from(new Uint8Array(sig), b => b.toString(16).padStart(2, "0")).join(""))
+  return _tokenCache
 }

src/lib/supervisor.ts

@@ -132,25 +132,51 @@ export function captureThumb(streamId: string, delay = 60): void {
 
 export type ProgramStatus = "RUNNING" | "STOPPED" | "FATAL" | "STARTING" | "UNKNOWN"
 
-export function getStreamStatus(id: string): Record<string, ProgramStatus> {
-  const programs = ["xvfb", "chromium", "autologin", "x11vnc", "ffmpeg"]
+// Cache for supervisorctl status — refreshed at most once every 3 seconds across all callers
+let _statusCache: Record<string, Record<string, ProgramStatus>> | null = null
+let _statusCacheAt = 0
+const STATUS_CACHE_TTL = 3000
 
-  if (IS_DEV) {
-    return Object.fromEntries(programs.map((p) => [p, "STOPPED" as ProgramStatus]))
-  }
+function fetchAllStatuses(): Record<string, Record<string, ProgramStatus>> {
+  const now = Date.now()
+  if (_statusCache && now - _statusCacheAt < STATUS_CACHE_TTL) return _statusCache
 
-  const result: Record<string, ProgramStatus> = {}
-  for (const p of programs) {
+  const result: Record<string, Record<string, ProgramStatus>> = {}
   try {
+    // One call for all programs — avoid N×5 blocking execSync calls per poll cycle
     const out = execSync(
-        `supervisorctl -c /etc/supervisor/supervisord.conf status ${p}-${id}`,
+      `supervisorctl -c /etc/supervisor/supervisord.conf status`,
       { stdio: "pipe" }
     ).toString()
-      const match = out.match(/\b(RUNNING|STOPPED|FATAL|STARTING)\b/)
-      result[p] = (match?.[1] as ProgramStatus) ?? "UNKNOWN"
+    for (const line of out.split("\n")) {
+      // e.g. "ffmpeg-abc123          RUNNING   pid 42, uptime 0:01:00"
+      const m = line.match(/^(\S+)-(\S+)\s+(RUNNING|STOPPED|FATAL|STARTING)/)
+      if (!m) continue
+      const [, program, id, status] = m
+      if (!result[id]) result[id] = {}
+      result[id][program] = status as ProgramStatus
+    }
   } catch {
-      result[p] = "UNKNOWN"
-    }
+    // supervisorctl can exit non-zero; return whatever was parsed
   }
+
+  _statusCache = result
+  _statusCacheAt = now
   return result
 }
+
+export function getStreamStatus(id: string): Record<string, ProgramStatus> {
+  const programs = ["xvfb", "chromium", "autologin", "x11vnc", "ffmpeg"]
+  if (IS_DEV) return Object.fromEntries(programs.map((p) => [p, "STOPPED" as ProgramStatus]))
+  const all = fetchAllStatuses()
+  return all[id] ?? Object.fromEntries(programs.map((p) => [p, "UNKNOWN" as ProgramStatus]))
+}
+
+export function getAllStreamStatuses(): Record<string, Record<string, ProgramStatus>> {
+  const programs = ["xvfb", "chromium", "autologin", "x11vnc", "ffmpeg"]
+  if (IS_DEV) {
+    const { readStreams } = require("./db") as typeof import("./db")
+    return Object.fromEntries(readStreams().map((s) => [s.id, Object.fromEntries(programs.map((p) => [p, "STOPPED" as ProgramStatus]))]))
+  }
+  return fetchAllStatuses()
+}

src/middleware.ts

@@ -22,7 +22,10 @@ export async function middleware(request: NextRequest) {
     return NextResponse.redirect(url)
   }
 
-  // Rolling session — refresh cookie on every request, resetting the 30-day timer
+  // Rolling session — refresh cookie only on page navigations, not API/HLS/asset requests
+  if (pathname.startsWith("/api/") || pathname.startsWith("/player")) {
+    return NextResponse.next()
+  }
   const res = NextResponse.next()
   res.cookies.set(COOKIE_NAME, cookie, {
     httpOnly: true,