http: configure simultaneous connection limit with -rpcmaxconnections

src/httpserver.h

@@ -44,7 +44,7 @@ inline constexpr int DEFAULT_HTTP_SERVER_TIMEOUT=30;
 /**
  * Maximum number of connected HTTP clients
  */
-inline constexpr int MAX_HTTP_CONNECTIONS = 16;
+inline constexpr int DEFAULT_MAX_HTTP_CONNECTIONS = 16;
 
 enum class HTTPRequestMethod {
     UNKNOWN,
@@ -316,6 +316,11 @@ public:
      */
     void SetServerTimeout(std::chrono::seconds seconds) { m_rpcservertimeout = seconds; }
 
+    /**
+     * Set the maximum amount of connected HTTPClients (-rpcmaxconnections)
+     */
+    void SetMaxConnections(int max_conn) { m_rpcmaxconnections = max_conn; }
+
     /**
      * Force-remove all remaining clients from m_connected without waiting for
      * graceful disconnection. Must only be called after JoinSocketsThreads().
@@ -421,6 +426,11 @@ private:
      */
     bool ClientAllowed(const CNetAddr& netaddr) const;
 
+    /**
+     * Maximum amount of concurrent connections
+     */
+    int m_rpcmaxconnections{DEFAULT_MAX_HTTP_CONNECTIONS};
+
     /**
      * Accept a connection.
      * @param[in] listen_sock Socket on which to accept the connection.