feat: expose native server stats

transport/native/server_test.go

@@ -789,6 +789,57 @@ func TestServerConnectionLimitReleasesAfterRequest(t *testing.T) {
 	}
 }
 
+func TestServerStatsTrackLifecycle(t *testing.T) {
+	started := make(chan struct{})
+	release := make(chan struct{})
+	application := omni.NewWithRouter(netrouter.New())
+	application.GET("/hold", func(ctx *omni.Context) error {
+		close(started)
+		<-release
+		return ctx.OK("done")
+	})
+	server, listener, done := startServer(t, application)
+	defer stopServer(t, server, listener, done)
+
+	conn, err := net.Dial("tcp", listener.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer conn.Close()
+	waitForStats := func(check func(native.Stats) bool) {
+		t.Helper()
+		deadline := time.Now().Add(time.Second)
+		for time.Now().Before(deadline) {
+			if check(server.Stats()) {
+				return
+			}
+			time.Sleep(time.Millisecond)
+		}
+		t.Fatalf("stats condition not reached: %+v", server.Stats())
+	}
+	waitForStats(func(stats native.Stats) bool { return stats.ActiveConnections == 1 && stats.AcceptedConnections >= 1 })
+	if _, err := io.WriteString(conn, "GET /hold HTTP/1.1\r\nHost: test\r\nConnection: close\r\n\r\n"); err != nil {
+		t.Fatal(err)
+	}
+	select {
+	case <-started:
+	case <-time.After(time.Second):
+		t.Fatal("hold handler did not start")
+	}
+	waitForStats(func(stats native.Stats) bool { return stats.ActiveRequests == 1 })
+	close(release)
+	response, err := http.ReadResponse(bufio.NewReader(conn), &http.Request{Method: http.MethodGet})
+	if err != nil {
+		t.Fatal(err)
+	}
+	response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		t.Fatalf("unexpected hold response: %d", response.StatusCode)
+	}
+	waitForStats(func(stats native.Stats) bool { return stats.ActiveRequests == 0 })
+	waitForStats(func(stats native.Stats) bool { return stats.ActiveConnections == 0 })
+}
+
 func TestServerConnectionChurnReusesStateSafely(t *testing.T) {
 	application := omni.NewWithRouter(netrouter.New())
 	application.GET("/health", func(ctx *omni.Context) error { return ctx.OK("ok") })