/** Tracer used to demonstrate logging communication between client and server.
  */
class myTracer : public vmime::net::tracer {

public:

	myTracer(
		const vmime::shared_ptr <std::ostringstream>& stream,
		const vmime::shared_ptr <vmime::net::service>& serv,
		const int connectionId
	)
		: m_stream(stream),
		  m_service(serv),
		  m_connectionId(connectionId) {

	}

	void traceSend(const vmime::string& line) {

		*m_stream << "[" << m_service->getProtocolName() << ":" << m_connectionId
		          << "] C: " << line << std::endl;
	}

	void traceReceive(const vmime::string& line) {

		*m_stream << "[" << m_service->getProtocolName() << ":" << m_connectionId
		          << "] S: " << line << std::endl;
	}

private:

	vmime::shared_ptr <std::ostringstream> m_stream;
	vmime::shared_ptr <vmime::net::service> m_service;
	const int m_connectionId;
};


class myTracerFactory : public vmime::net::tracerFactory {

public:

	myTracerFactory(const vmime::shared_ptr <std::ostringstream>& stream)
		: m_stream(stream) {

	}

	vmime::shared_ptr <vmime::net::tracer> create(
		const vmime::shared_ptr <vmime::net::service>& serv,
		const int connectionId
	) {

		return vmime::make_shared <myTracer>(m_stream, serv, connectionId);
	}

private:

	vmime::shared_ptr <std::ostringstream> m_stream;
};