feat: validate Worker protocol and verify process crash recovery

sdk/go/worker_integration_test.go

@@ -48,18 +48,21 @@ func integrationWorkerClient(t *testing.T) (*Client, string, string) {
 // workerFaultGateway 在实际服务端确认后丢弃指定 ACK；SDK 到网关使用真实 TLS。
 // 只丢响应，不伪造任务状态，测试凭据不进入 URL 或输出。
 type workerFaultGateway struct {
-	drop    atomic.Value
-	offline atomic.Bool
-	mu      sync.Mutex
-	active  map[*websocket.Conn]struct{}
-	dropped chan string
-	server  *httptest.Server
+	drop        atomic.Value
+	target      atomic.Value
+	dropOffline atomic.Bool
+	offline     atomic.Bool
+	mu          sync.Mutex
+	active      map[*websocket.Conn]struct{}
+	dropped     chan string
+	server      *httptest.Server
 }
 
 func newWorkerFaultGateway(t *testing.T, upstream string) *workerFaultGateway {
 	t.Helper()
 	g := &workerFaultGateway{dropped: make(chan string, 4), active: make(map[*websocket.Conn]struct{})}
 	g.drop.Store("")
+	g.target.Store(upstream)
 	ctx, cancel := context.WithCancel(context.Background())
 	var handlers sync.WaitGroup
 	g.server = httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -73,7 +76,7 @@ func newWorkerFaultGateway(t *testing.T, upstream string) *workerFaultGateway {
 		defer stop()
 		header := http.Header{}
 		header.Set("Authorization", r.Header.Get("Authorization"))
-		up, _, err := websocket.Dial(bridge, upstream+"/v1/worker/connect", &websocket.DialOptions{HTTPHeader: header, Subprotocols: []string{workerSubprotocol}})
+		up, _, err := websocket.Dial(bridge, g.target.Load().(string)+"/v1/worker/connect", &websocket.DialOptions{HTTPHeader: header, Subprotocols: []string{workerSubprotocol}})
 		if err != nil {
 			http.Error(w, "upstream unavailable", 503)
 			return
@@ -135,6 +138,9 @@ func newWorkerFaultGateway(t *testing.T, upstream string) *workerFaultGateway {
 				delete(operations, f.ReplyTo)
 				mu.Unlock()
 				if f.Type == "ack" && operation != "" && g.drop.CompareAndSwap(operation, "") {
+					if g.dropOffline.Load() {
+						g.offline.Store(true)
+					}
 					g.dropped <- operation
 					return
 				}