feat(multiplayer): acknowledge supervisor shutdown

server/supervisor/supervisor_test.go

@@ -629,6 +629,82 @@ func TestRunDrainsBeforeChildExit(t *testing.T) {
 	}
 }
 
+func TestRunAcknowledgesControlledShutdownWithWorkloadCredential(t *testing.T) {
+	marker := filepath.Join(t.TempDir(), "drained")
+	tokenPath := filepath.Join(t.TempDir(), "token")
+	if err := os.WriteFile(tokenPath, []byte("workload-secret"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	var shutdownCalls int
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/drain":
+			if r.Header.Get("Authorization") != "Bearer run-secret" {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			if err := os.WriteFile(marker, []byte("drained"), 0600); err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+			w.WriteHeader(http.StatusAccepted)
+		case "/v1/servers/server-1/shutdown":
+			if r.Header.Get("Authorization") != "Bearer workload-secret" || r.Header.Get("Idempotency-Key") == "" {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			shutdownCalls++
+			w.WriteHeader(http.StatusNoContent)
+		default:
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+	s, err := New(Config{
+		Command:  []string{"/bin/sh", "-c", "while [ ! -f '" + marker + "' ]; do sleep 0.01; done"},
+		DrainURL: server.URL + "/drain", DrainToken: "run-secret", ControlPlaneURL: server.URL,
+		WorkloadTokenPath: tokenPath, ServerID: "server-1", MatchID: "match-1", ProtocolVersion: 1,
+		ImageDigest: "sha256:aa",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	time.AfterFunc(30*time.Millisecond, cancel)
+	if err := s.Run(ctx, time.Second); err != nil {
+		t.Fatalf("graceful run: %v", err)
+	}
+	if shutdownCalls != 1 {
+		t.Fatalf("shutdown calls = %d, want 1", shutdownCalls)
+	}
+}
+
+func TestRunDoesNotAcknowledgeWhenLocalDrainFails(t *testing.T) {
+	var shutdownCalls int
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/v1/servers/server-1/shutdown" {
+			shutdownCalls++
+		}
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	defer server.Close()
+	s, err := New(Config{
+		Command:  []string{"/bin/sh", "-c", "sleep 5"},
+		DrainURL: server.URL + "/drain", DrainToken: "run-secret", ControlPlaneURL: server.URL,
+		WorkloadTokenPath: filepath.Join(t.TempDir(), "missing-token"), ServerID: "server-1", MatchID: "match-1",
+		ProtocolVersion: 1, ImageDigest: "sha256:aa",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	time.AfterFunc(30*time.Millisecond, cancel)
+	err = s.Run(ctx, 50*time.Millisecond)
+	if err == nil || shutdownCalls != 0 {
+		t.Fatalf("failed drain result=%v shutdown calls=%d", err, shutdownCalls)
+	}
+}
+
 func TestRunForceKillsUnresponsiveChildAtDeadline(t *testing.T) {
 	s, err := New(Config{Command: []string{"/bin/sh", "-c", "trap '' TERM; sleep 5"}})
 	if err != nil {