Send backend id back to main instance

include/transport/networkpluginserver.h

@@ -56,6 +56,7 @@ class NetworkPluginServer {
 			bool acceptUsers;
 			bool longRun;
 			bool willDie;
+			std::string id;
 		};
 
 		NetworkPluginServer(Component *component, Config *config, UserManager *userManager, FileTransferManager *ftManager);

include/transport/protocol.proto

@@ -106,6 +106,7 @@ message Stats {
 	required int32 res = 1;
 	required int32 init_res = 2;
 	required int32 shared = 3;
+	required string id = 4;
 }
 
 message File {

plugin/cpp/networkplugin.cpp

@@ -41,6 +41,12 @@ namespace Transport {
 	wrap.set_payload(MESSAGE); \
 	wrap.SerializeToString(&MESSAGE);
 
+template <class T> std::string stringOf(T object) {
+	std::ostringstream os;
+	os << object;
+	return (os.str());
+}
+
 NetworkPlugin::NetworkPlugin() {
 	m_pingReceived = false;
 
@@ -603,6 +609,8 @@ void NetworkPlugin::sendMemoryUsage() {
 	std::string message;
 	stats.SerializeToString(&message);
 
+	stats.set_id(stringOf(getpid()));
+
 	WRAP(message, pbnetwork::WrapperMessage_Type_TYPE_STATS);
 
 	send(message);

src/networkpluginserver.cpp

@@ -612,6 +612,7 @@ void NetworkPluginServer::handleStatsPayload(Backend *c, const std::string &data
 	c->res = payload.res();
 	c->init_res = payload.init_res();
 	c->shared = payload.shared();
+	c->id = payload.id();
 }
 
 void NetworkPluginServer::handleFTStartPayload(const std::string &data) {