libnghttp2_asio: Add request::closed() to indicate that stream has been closed

src/asio_http2_handler.cc

@@ -82,6 +82,11 @@ bool request::pushed() const
   return impl_->pushed();
 }
 
+bool request::closed() const
+{
+  return impl_->closed();
+}
+
 void request::on_data(data_cb cb)
 {
   return impl_->on_data(std::move(cb));
@@ -225,6 +230,11 @@ void request_impl::pushed(bool f)
   pushed_ = f;
 }
 
+bool request_impl::closed() const
+{
+  return handler_.expired() || stream_.expired();
+}
+
 void request_impl::on_data(data_cb cb)
 {
   on_data_cb_ = std::move(cb);

src/asio_http2_handler.h

@@ -60,6 +60,7 @@ public:
             std::vector<header> headers = {});
 
   bool pushed() const;
+  bool closed() const;
 
   void on_data(data_cb cb);
   void on_end(void_cb cb);

src/includes/nghttp2/asio_http2.h

@@ -101,6 +101,9 @@ public:
   // Returns true if this is pushed request.
   bool pushed() const;
 
+  // Returns true if stream has been closed.
+  bool closed() const;
+
   // Application must not call this directly.
   request_impl& impl();
 private: