support full DC NTE credentials

src/EventUtils.cc

@@ -18,3 +18,26 @@ void forward_to_event_thread(std::shared_ptr<struct event_base> base, std::funct
   std::function<void()>* new_fn = new std::function<void()>(std::move(fn));
   event_base_once(base.get(), -1, EV_TIMEOUT, dispatch_forward_to_event_thread, new_fn, &tv);
 }
+
+template <>
+void call_on_event_thread<void>(std::shared_ptr<struct event_base> base, std::function<void()>&& compute) {
+  bool succeeded = false;
+  std::string exc_what;
+  std::mutex ret_lock;
+  std::condition_variable ret_cv;
+  std::unique_lock<std::mutex> g(ret_lock);
+  forward_to_event_thread(base, [&]() -> void {
+    std::lock_guard<std::mutex> g(ret_lock);
+    try {
+      compute();
+      succeeded = true;
+    } catch (const std::exception& e) {
+      exc_what = e.what();
+    }
+    ret_cv.notify_one();
+  });
+  ret_cv.wait(g);
+  if (!succeeded) {
+    throw std::runtime_error(exc_what);
+  }
+}