Assert stranded, add protocol_ws::stopping.

Author: evoskuil

include/bitcoin/node/protocols/protocol_ws.hpp

@@ -51,9 +51,16 @@ class BCN_API protocol_ws
     /// Public start is required.
     inline void start() NOEXCEPT override
     {
+        BC_ASSERT(stranded());
         network::protocol_ws::start();
     }
 
+    inline void stopping(const code& ec) NOEXCEPT override
+    {
+        BC_ASSERT(stranded());
+        network::protocol_ws::stopping(ec);
+    }
+
 private:
     // This is thread safe.
     ////const options_t& options_;