fix: track live downstream cmpp connections

gateway/internal/inbound/server_test.go

@@ -99,6 +99,7 @@ func TestInboundServerAuthenticatesAndSubmits(t *testing.T) {
 	password := "secret-hash"
 	var gotAuth authRequest
 	var gotSubmit submitRequest
+	connectionEvents := make(chan downstreamConnectionEvent, 8)
 	api := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		switch r.URL.Path {
 		case "/api/gateway/events/inbound/authenticate":
@@ -113,6 +114,13 @@ func TestInboundServerAuthenticatesAndSubmits(t *testing.T) {
 			_ = json.NewEncoder(w).Encode(submitResponse{Accepted: true, MessageID: "MSG-1"})
 		case "/api/gateway/events/downstream/pending":
 			_ = json.NewEncoder(w).Encode([]pendingDelivery{})
+		case "/api/gateway/events/inbound/connection":
+			var event downstreamConnectionEvent
+			if err := json.NewDecoder(r.Body).Decode(&event); err != nil {
+				t.Fatalf("decode connection event: %v", err)
+			}
+			connectionEvents <- event
+			w.WriteHeader(http.StatusOK)
 		default:
 			t.Fatalf("unexpected api path: %s", r.URL.Path)
 		}
@@ -130,6 +138,14 @@ func TestInboundServerAuthenticatesAndSubmits(t *testing.T) {
 	if err := client.Connect(addr, account, password, 2*time.Second); err != nil {
 		t.Fatalf("connect inbound cmpp: %v", err)
 	}
+	select {
+	case event := <-connectionEvents:
+		if event.Status != "connected" || event.Account != account || event.ConnectionID == "" || event.RemoteIP == "" || event.Protocol != "cmpp30" {
+			t.Fatalf("unexpected connection event: %+v", event)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("expected downstream connected callback")
+	}
 
 	content, err := cmpputils.Utf8ToUcs2("测试入站")
 	if err != nil {
@@ -207,6 +223,8 @@ func TestInboundServerNegotiatesCMPP2AndUsesAuthenticatedAccountForSubmit(t *tes
 			_ = json.NewEncoder(w).Encode(submitResponse{Accepted: true, MessageID: "MSG-CMPP2"})
 		case "/api/gateway/events/downstream/pending":
 			_ = json.NewEncoder(w).Encode([]pendingDelivery{})
+		case "/api/gateway/events/inbound/connection":
+			w.WriteHeader(http.StatusOK)
 		default:
 			t.Fatalf("unexpected api path: %s", r.URL.Path)
 		}