fix: Add queue size limit for websocket (#1701)

For slow clients, we will disconnect with it if the message queue is too
long.

---------

Co-authored-by: Sergey Kuznetsov <skuznetsov@ripple.com>

src/web/SslHttpSession.hpp

@@ -37,6 +37,7 @@
 
 #include <chrono>
 #include <cstddef>
+#include <cstdint>
 #include <functional>
 #include <memory>
 #include <string>
@@ -59,6 +60,7 @@ class SslHttpSession : public impl::HttpBase<SslHttpSession, HandlerType>,
                        public std::enable_shared_from_this<SslHttpSession<HandlerType>> {
     boost::beast::ssl_stream<boost::beast::tcp_stream> stream_;
     std::reference_wrapper<util::TagDecoratorFactory const> tagFactory_;
+    std::uint32_t maxWsSendingQueueSize_;
 
 public:
     /**
@@ -72,6 +74,7 @@ public:
      * @param dosGuard The denial of service guard to use
      * @param handler The server handler to use
      * @param buffer Buffer with initial data received from the peer
+     * @param maxWsSendingQueueSize The maximum size of the sending queue for websocket
      */
     explicit SslHttpSession(
         tcp::socket&& socket,
@@ -81,7 +84,8 @@ public:
         std::reference_wrapper<util::TagDecoratorFactory const> tagFactory,
         std::reference_wrapper<dosguard::DOSGuardInterface> dosGuard,
         std::shared_ptr<HandlerType> const& handler,
-        boost::beast::flat_buffer buffer
+        boost::beast::flat_buffer buffer,
+        std::uint32_t maxWsSendingQueueSize
     )
         : impl::HttpBase<SslHttpSession, HandlerType>(
               ip,
@@ -93,6 +97,7 @@ public:
           )
         , stream_(std::move(socket), ctx)
         , tagFactory_(tagFactory)
+        , maxWsSendingQueueSize_(maxWsSendingQueueSize)
     {
     }
 
@@ -173,7 +178,8 @@ public:
             this->handler_,
             std::move(this->buffer_),
             std::move(this->req_),
-            ConnectionBase::isAdmin()
+            ConnectionBase::isAdmin(),
+            maxWsSendingQueueSize_
         )
             ->run();
     }