jim800121chen 3f0175f1a9 feat(local-agent): Phase 0.5 visionA Agent — Wails 桌面 + tunnel client + 配對 UI
從 local-tool 複製出獨立的「visionA Agent」桌面應用(A3 純橋樑:
tunnel client + 配對 UI + 設定,不開 HTTP port、不做本機裝置/推論 UI)。
Bundle ID 與 local-tool 不同(com.innovedus.visiona-agent vs visiona-local),
雙 app 可共存。fork 後不主動 sync,需要時手動 cherry-pick。

Backend / Wails Go(AB1-AB13):
- internal/tunnel:6 狀態機(Idle/Connecting/Connected/Reconnecting/Failed/Stopped)
  + Pair/Unpair/Reconnect/Disconnect binding + ClientHooks event
- internal/auth:encrypted file token store(AES-GCM + scrypt + machineID
  fallback salt + 13 tests)
- internal/config:YAML validation + atomic write + 11 tests
- internal/log:ring buffer + ExportLog 升級 zip
- visionA-backend /api/pairing/exchange:SessionTokenStore + 17 new tests
- 三平台 build 驗證(macOS DMG 160 MB / Windows EXE / Linux AppImage)
- end-to-end 5 milestone 全綠(pairing → tunnel → forward → reuse 防護
  → tunnel drop failover)

Frontend / Next.js(AF1-AF7,沿用 visionA-frontend 基礎):
- AppShell + Header + TabNav(StatusView / PairView / SettingsView 三 tab)
- ConnectionStatusBadge 5 種狀態
- TokenInput regex 驗證 + 7 種錯誤 + 0.5s auto-switch 到狀態頁
- 設定頁 4 區塊(含重新配對 AlertDialog)
- agent-api.ts 封裝 Wails bindings(mock/real 雙實作)+ 90 tests

Phase 0.7 review-driven fix(Round 2):
- A1 Session fixation 防護(RotateSessionID)
- A3 mock pairing 預設改 false(必須明確 opt-in)+ startup log
- A4 Pair 失敗後 state 清理矩陣(exchange/Save/Start fail 各自終態)
- A5 Pair/Unpair/Reconnect lifecycleMu + 50 goroutine race test
- F1 重新配對次按鈕 / F2 PairView Esc cancel / F3 Wails BrowserOpenURL
  / F4 Settings draft 持久 + 未儲存 badge

驗證:agent backend go test -race -count=3 ./... 4 packages 全綠 /
agent frontend pnpm test 119 tests 全綠

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 11:22:01 +08:00

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package ws
// system_ws.go — MAJ-4 補丁:/ws/system WebSocket endpoint
//
// 對應 TDD v2/server-lifecycle.md §2.3Minor 4與 v2/web-ui-offline-overlay.md §3.2a。
//
// 用途:讓瀏覽器 tab 訂閱 server 的 `server:shutdown-imminent` 廣播,
// 以便在 Wails 關閉 / Restart 流程 SIGTERM 前立即顯示 Offline Overlay
// 避免只靠 health polling 導致的 15 秒延遲與 race。
//
// 室room名稱`system`
// - Hub.BroadcastToRoom("system", payload) 由 system_handler.ShutdownNotify 呼叫
// - 目前只支援單一類型事件server:shutdown-imminent未來若有其他 system 事件可共用此 room
//
// 設計注意:
// - 不向新 client 送任何歷史訊息shutdown event 必須「當下」收到才有意義,
// 補送一個過期的 shutdown 訊息會誤導前端)。
// - Read pump 只用於偵測 client 主動斷線,不處理任何 client → server 訊息。
// - 沿用 upgrader + CheckOriginloopback 白名單)。
import (
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
)
// SystemEventsHandler 處理 /ws/system 的 WebSocket 升級與訂閱。
func SystemEventsHandler(hub *Hub) gin.HandlerFunc {
return func(c *gin.Context) {
conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
return
}
defer conn.Close()
client := &Client{Conn: conn, Send: make(chan []byte, 16)}
sub := &Subscription{Client: client, Room: "system"}
hub.RegisterSync(sub)
defer hub.Unregister(sub)
// Read pump — 唯一目的:偵測 client 斷線close frame / socket error→ 觸發 conn.Close
// 使得 write pump 的 range client.Send 結束後能乾淨退出。
go func() {
defer conn.Close()
for {
if _, _, err := conn.ReadMessage(); err != nil {
return
}
}
}()
// Write pump — 把 Hub 塞進 client.Send 的訊息送出去。
for msg := range client.Send {
if err := conn.WriteMessage(websocket.TextMessage, msg); err != nil {
return
}
}
}
}