Add rd_close_ to websocket stream state

include/beast/websocket/impl/read.ipp

@@ -472,6 +472,8 @@ operator()(error_code ec,
                 }
                 BOOST_ASSERT(d.fh.op == detail::opcode::close);
                 {
+                    BOOST_ASSERT(! d.ws.rd_close_);
+                    d.ws.rd_close_ = true;
                     detail::read(d.ws.cr_, d.fb.data(), code);
                     if(code != close_code::none)
                     {
@@ -822,6 +824,8 @@ read_frame(DynamicBuffer& dynabuf, error_code& ec)
             }
             BOOST_ASSERT(fh.op == detail::opcode::close);
             {
+                BOOST_ASSERT(! rd_close_);
+                rd_close_ = true;
                 detail::read(cr_, fb.data(), code);
                 if(code != close_code::none)
                     goto do_close;

include/beast/websocket/impl/stream.ipp

@@ -79,6 +79,7 @@ open(role_type role)
     role_ = role;
     failed_ = false;
     rd_.cont = false;
+    rd_close_ = false;
     wr_close_ = false;
     wr_block_ = nullptr;    // should be nullptr on close anyway
     ping_data_ = nullptr;   // should be nullptr on close anyway
@@ -132,6 +133,7 @@ reset()
 {
     failed_ = false;
     rd_.cont = false;
+    rd_close_ = false;
     wr_close_ = false;
     wr_.cont = false;
     wr_block_ = nullptr;    // should be nullptr on close anyway

include/beast/websocket/stream.hpp

@@ -213,6 +213,7 @@ class stream
     role_type role_;                        // server or client
     bool failed_;                           // the connection failed
 
+    bool rd_close_;                         // read close frame
     bool wr_close_;                         // sent close frame
     op* wr_block_;                          // op currenly writing