asio: Export session_impl* from stream rather than delegating everything

src/asio_client_request_impl.cc

@@ -25,6 +25,7 @@
 #include "asio_client_request_impl.h"
 
 #include "asio_client_stream.h"
+#include "asio_client_session_impl.h"
 #include "template.h"
 
 namespace nghttp2 {
@@ -33,7 +34,10 @@ namespace client {
 
 request_impl::request_impl() : strm_(nullptr) {}
 
-void request_impl::cancel(uint32_t error_code) { strm_->cancel(error_code); }
+void request_impl::cancel(uint32_t error_code) {
+  auto sess = strm_->session();
+  sess->cancel(*strm_, error_code);
+}
 
 void request_impl::on_response(response_cb cb) { response_cb_ = std::move(cb); }
 
@@ -72,7 +76,10 @@ read_cb::result_type request_impl::call_on_read(uint8_t *buf, std::size_t len,
   return 0;
 }
 
-void request_impl::resume() { strm_->resume(); }
+void request_impl::resume() {
+  auto sess = strm_->session();
+  sess->resume(*strm_);
+}
 
 void request_impl::header(header_map h) { header_ = std::move(h); }
 

src/asio_client_stream.cc

@@ -36,10 +36,6 @@ stream::stream(session_impl *sess) : sess_(sess), stream_id_(0) {
   request_.impl().stream(this);
 }
 
-void stream::cancel(uint32_t error_code) { sess_->cancel(*this, error_code); }
-
-void stream::resume() { sess_->resume(*this); }
-
 void stream::stream_id(int32_t stream_id) { stream_id_ = stream_id; }
 
 int32_t stream::stream_id() const { return stream_id_; }
@@ -48,6 +44,8 @@ request &stream::request() { return request_; }
 
 response &stream::response() { return response_; }
 
+session_impl *stream::session() const { return sess_; }
+
 bool stream::expect_final_response() const {
   return response_.status_code() / 100 == 1;
 }

src/asio_client_stream.h

@@ -44,15 +44,14 @@ public:
   stream(const stream &) = delete;
   stream &operator=(const stream &) = delete;
 
-  void cancel(uint32_t error_code);
-  void resume();
-
   void stream_id(int32_t stream_id);
   int32_t stream_id() const;
 
   request &request();
   response &response();
 
+  session_impl *session() const;
+
   bool expect_final_response() const;
 
 private: