asio: Add signal_write() to server::http2_handler to avoid scattered ifs

src/asio_server_http2_handler.cc

@@ -343,6 +343,8 @@ int http2_handler::start_response(stream &strm) {
     return -1;
   }
 
+  signal_write();
+
   return 0;
 }
 
@@ -356,16 +358,22 @@ void http2_handler::leave_callback() {
   inside_callback_ = false;
 }
 
-bool http2_handler::inside_callback() const { return inside_callback_; }
-
 void http2_handler::stream_error(int32_t stream_id, uint32_t error_code) {
   ::nghttp2::asio_http2::server::stream_error(session_, stream_id, error_code);
+  signal_write();
+}
+
+void http2_handler::signal_write() {
+  if (!inside_callback_) {
+    initiate_write();
+  }
 }
 
 void http2_handler::initiate_write() { writefun_(); }
 
 void http2_handler::resume(stream &strm) {
   nghttp2_session_resume_data(session_, strm.get_stream_id());
+  signal_write();
 }
 
 response *http2_handler::push_promise(boost::system::error_code &ec,
@@ -412,6 +420,8 @@ response *http2_handler::push_promise(boost::system::error_code &ec,
   auto &promised_res = promised_strm->response().impl();
   promised_res.pushed(true);
 
+  signal_write();
+
   return &promised_strm->response();
 }
 

src/asio_server_http2_handler.h

@@ -76,7 +76,6 @@ public:
 
   void enter_callback();
   void leave_callback();
-  bool inside_callback() const;
 
   void resume(stream &s);
 
@@ -84,6 +83,8 @@ public:
                          std::string method, std::string raw_path_query,
                          header_map h);
 
+  void signal_write();
+
   boost::asio::io_service &io_service();
 
   template <size_t N>

src/asio_server_response_impl.cc

@@ -72,12 +72,7 @@ void response_impl::call_on_close(uint32_t error_code) {
 
 void response_impl::cancel(uint32_t error_code) {
   auto handler = strm_->handler();
-
   handler->stream_error(strm_->get_stream_id(), error_code);
-
-  if (!handler->inside_callback()) {
-    handler->initiate_write();
-  }
 }
 
 void response_impl::start_response() {
@@ -91,10 +86,6 @@ void response_impl::start_response() {
     handler->stream_error(strm_->get_stream_id(), NGHTTP2_INTERNAL_ERROR);
     return;
   }
-
-  if (!handler->inside_callback()) {
-    handler->initiate_write();
-  }
 }
 
 response *response_impl::push(boost::system::error_code &ec, std::string method,
@@ -107,10 +98,6 @@ response *response_impl::push(boost::system::error_code &ec, std::string method,
 void response_impl::resume() {
   auto handler = strm_->handler();
   handler->resume(*strm_);
-
-  if (!handler->inside_callback()) {
-    handler->initiate_write();
-  }
 }
 
 boost::asio::io_service &response_impl::io_service() {