listener: create generic ProxyListener abstract class

This class can be used by pgproxy to operate on listeners
no matter their actual implementation.

This way pgproxy can support different listeners at the
same time.

Signed-off-by: Antonio Quartulli <antonio@openvpn.net>

openvpn/ws/httpserv.hpp

@@ -50,6 +50,7 @@
 #endif
 
 // include acceptors for different protocols
+#include <openvpn/proxy/listener.hpp>
 #include <openvpn/acceptor/base.hpp>
 #include <openvpn/acceptor/tcp.hpp>
 #if defined(OPENVPN_PLATFORM_WIN)
@@ -164,7 +165,7 @@ namespace openvpn {
 	WebSocket::Server::PerRequest::Ptr websocket;
       };
 
-      class Listener : public Acceptor::ListenerBase
+      class Listener : public ProxyListener
       {
       public:
 	class Client;
@@ -756,7 +757,7 @@ namespace openvpn {
 	{
 	}
 
-	void start()
+	virtual void start() override
 	{
 	  if (halt)
 	    return;
@@ -872,7 +873,7 @@ namespace openvpn {
 	    }
 	}
 
-	void stop()
+	virtual void stop() override
 	{
 	  if (halt)
 	    return;