p3ChatService support async distant chat via Gxs

To implement async distant chat p3ChatService use p3GxsMails in a similar way that has been done with p3MsgService tought as p3ChatService was not thinked for async comunication in the first place the result is quite clumsy. A proper chat service should be rewritten from scratch in the near future, with proper chat history and other desiderables features. deprecated empty p3ChatService::locked_storeIncomingMsg(...)
2024-10-01 02:35:48 -04:00 · 2017-02-27 22:18:37 +01:00 · 2017-02-27 22:18:37 +01:00 · 4c89641d3e
commit 4c89641d3e
parent f19fe56a93
5 changed files with 466 additions and 198 deletions
--- a/libretroshare/src/chat/p3chatservice.cc
+++ b/libretroshare/src/chat/p3chatservice.cc
@ -53,40 +53,30 @@ static const uint32_t MAX_AVATAR_JPEG_SIZE              = 32767; // Maximum size
                                                                 // don't transfer correctly and can kill the system.
 																					  // Images are 96x96, which makes approx. 27000 bytes uncompressed.

-p3ChatService::p3ChatService(p3ServiceControl *sc,p3IdService *pids, p3LinkMgr *lm, p3HistoryMgr *historyMgr)
-    : DistributedChatService(getServiceInfo().mServiceType,sc,historyMgr,pids), mChatMtx("p3ChatService"),mServiceCtrl(sc), mLinkMgr(lm) , mHistoryMgr(historyMgr)
+p3ChatService::p3ChatService( p3ServiceControl *sc, p3IdService *pids,
+                              p3LinkMgr *lm, p3HistoryMgr *historyMgr,
+                              p3GxsMails& gxsMailService ) :
+    DistributedChatService(getServiceInfo().mServiceType, sc, historyMgr,pids),
+    mChatMtx("p3ChatService"), mServiceCtrl(sc), mLinkMgr(lm),
+    mHistoryMgr(historyMgr), _own_avatar(NULL),
+    _serializer(new RsChatSerialiser()), mGxsTransport(gxsMailService),
+    recentlyReceivedMutex("p3ChatService recently received mutex")
 {
-	_serializer = new RsChatSerialiser() ;
-
-	_own_avatar = NULL ;
-	_custom_status_string = "" ;
-
-	addSerialType(_serializer) ;
+	addSerialType(_serializer);
+	mGxsTransport.registerGxsMailsClient( GxsMailSubServices::P3_CHAT_SERVICE,
+	                                      this );
 }

-const std::string CHAT_APP_NAME = "chat";
-const uint16_t CHAT_APP_MAJOR_VERSION	= 	1;
-const uint16_t CHAT_APP_MINOR_VERSION  = 	0;
-const uint16_t CHAT_MIN_MAJOR_VERSION  = 	1;
-const uint16_t CHAT_MIN_MINOR_VERSION	=	0;
-
 RsServiceInfo p3ChatService::getServiceInfo()
-{
-	return RsServiceInfo(RS_SERVICE_TYPE_CHAT, 
-		CHAT_APP_NAME,
-		CHAT_APP_MAJOR_VERSION, 
-		CHAT_APP_MINOR_VERSION, 
-		CHAT_MIN_MAJOR_VERSION, 
-		CHAT_MIN_MINOR_VERSION);
-}
+{ return RsServiceInfo(RS_SERVICE_TYPE_CHAT, "chat", 1, 0, 1, 0); }

 int	p3ChatService::tick()
 {
-	if(receivedItems()) 
-		receiveChatQueue();
+	if(receivedItems()) receiveChatQueue();

-	DistributedChatService::flush() ;
-	//DistantChatService::flush() ;
+	DistributedChatService::flush();
+
+	cleanListOfReceivedMessageHashes();

 	return 0;
 }
@ -253,12 +243,12 @@ void p3ChatService::clearChatLobby(const ChatId& id)

 void p3ChatService::sendChatItem(RsChatItem *item)
 {
-	if(DistantChatService::handleOutgoingItem(item))
-		return ;
+	if(DistantChatService::handleOutgoingItem(item)) return;
 #ifdef CHAT_DEBUG
-	std::cerr << "p3ChatService::sendChatItem(): sending to " << item->PeerId() << ": interpreted as friend peer id." << std::endl;
+	std::cerr << "p3ChatService::sendChatItem(): sending to " << item->PeerId()
+	          << ": interpreted as friend peer id." << std::endl;
 #endif
-	sendItem(item) ;
+	sendItem(item);
 }

 void p3ChatService::checkSizeAndSendMessage(RsChatMsgItem *msg)
@ -336,28 +326,49 @@ bool p3ChatService::sendChat(ChatId destination, std::string msg)
    message.incoming = false;
    message.online = true;

-    if(!isOnline(vpid))
+	if(!isOnline(vpid))
 	{
-		/* peer is offline, add to outgoing list */
+		message.online = false;
+		RsServer::notify()->notifyChatMessage(message);
+
+		// use the history to load pending messages to the gui
+		// this is not very nice, because the user may think the message was send, while it is still in the queue
+		mHistoryMgr->addMessage(message);
+
+		RsGxsMailId tId = RSRandom::random_u64();
+
+		if(destination.isDistantChatId())
 		{
-			RS_STACK_MUTEX(mChatMtx);
-			privateOutgoingList.push_back(ci);
+			DEPMap::const_iterator it =
+			        mDistantGxsMap.find(destination.toDistantChatId());
+			if(it != mDistantGxsMap.end())
+			{
+				const DistantEndpoints& de(it->second);
+				uint32_t sz = ci->serial_size();
+				std::vector<uint8_t> data; data.resize(sz);
+				ci->serialise(&data[0], sz);
+				mGxsTransport.sendMail(tId, GxsMailSubServices::P3_CHAT_SERVICE,
+				                       de.from, de.to, &data[0], sz);
+			}
+			else
+				std::cout << "p3ChatService::sendChat(...) can't find distant"
+				          << "chat id in mDistantGxsMap this is unxpected!"
+				          << std::endl;
 		}

-        message.online = false;
-        RsServer::notify()->notifyChatMessage(message);
+		// peer is offline, add to outgoing list
+		{
+			RS_STACK_MUTEX(mChatMtx);
+			privateOutgoingMap.insert(outMP::value_type(tId, ci));
+		}

-        // use the history to load pending messages to the gui
-        // this is not very nice, because the user may think the message was send, while it is still in the queue
-        mHistoryMgr->addMessage(message);
+		IndicateConfigChanged();
+		return false;
+	}

-        IndicateConfigChanged();
-        return false;
-    }
-
-    {
-        RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
-        std::map<RsPeerId,AvatarInfo*>::iterator it = _avatars.find(vpid) ;
+	{
+		RS_STACK_MUTEX(mChatMtx);
+		std::map<RsPeerId,AvatarInfo*>::iterator it = _avatars.find(vpid);

        if(it == _avatars.end())
        {
@ -505,50 +516,50 @@ class MsgCounter
 void p3ChatService::handleIncomingItem(RsItem *item)
 {
 #ifdef CHAT_DEBUG
-	std::cerr << "p3ChatService::receiveChatQueue() Item:" << (void*)item << std::endl ;
+	std::cerr << "p3ChatService::receiveChatQueue() Item:" << (void*)item
+	          << std::endl ;
 #endif

 	// RsChatMsgItems needs dynamic_cast, since they have derived siblings.
-	//
-	RsChatMsgItem *ci = dynamic_cast<RsChatMsgItem*>(item) ; 
-	if(ci != NULL) 
+	RsChatMsgItem* ci = dynamic_cast<RsChatMsgItem*>(item);
+	if(ci)
 	{
 		handleRecvChatMsgItem(ci);

-        	if(ci)
-			delete ci ;
+		/* +ci+ deletion is handled by handleRecvChatMsgItem ONLY in some
+		 * specific cases, in case +ci+ has not been handled deleted it here */
+		delete ci ;

-		return ;	// don't delete! It's handled by handleRecvChatMsgItem in some specific cases only.
+		return;
 	}

-//	if(DistantChatService::handleRecvItem(dynamic_cast<RsChatItem*>(item)))
-//	{
-//		delete item ;
-//		return ;
-//	}
-
-    if(DistributedChatService::handleRecvItem(dynamic_cast<RsChatItem*>(item)))
+	if(DistributedChatService::handleRecvItem(dynamic_cast<RsChatItem*>(item)))
 	{
-		delete item ;
-		return ;
+		delete item;
+		return;
 	}

 	switch(item->PacketSubType())
 	{
-		case RS_PKT_SUBTYPE_CHAT_STATUS:                handleRecvChatStatusItem(dynamic_cast<RsChatStatusItem*>(item)) ; break ;
-		case RS_PKT_SUBTYPE_CHAT_AVATAR:                handleRecvChatAvatarItem(dynamic_cast<RsChatAvatarItem*>(item)) ; break ;
-		default:
-																		{
-																			static int already = false ;
-
-																			if(!already)
-																			{
-																				std::cerr << "Unhandled item subtype " << (int)item->PacketSubType() << " in p3ChatService: " << std::endl;
-																				already = true ;
-																			}
-																		}
+	case RS_PKT_SUBTYPE_CHAT_STATUS:
+		handleRecvChatStatusItem(dynamic_cast<RsChatStatusItem*>(item));
+		break;
+	case RS_PKT_SUBTYPE_CHAT_AVATAR:
+		handleRecvChatAvatarItem(dynamic_cast<RsChatAvatarItem*>(item));
+		break;
+	default:
+	{
+		static int already = false;
+		if(!already)
+		{
+			std::cerr << "Unhandled item subtype "
+			          << static_cast<int>(item->PacketSubType())
+			          << " in p3ChatService: " << std::endl;
+			already = true;
+		}
 	}
-	delete item ;
+	}
+	delete item;
 }

 void p3ChatService::handleRecvChatAvatarItem(RsChatAvatarItem *ca)
@ -676,35 +687,105 @@ bool p3ChatService::checkForMessageSecurity(RsChatMsgItem *ci)
 	return true ;
 }

+bool p3ChatService::initiateDistantChatConnexion(
+        const RsGxsId& to_gxs_id, const RsGxsId& from_gxs_id,
+        DistantChatPeerId& pid, uint32_t& error_code )
+{
+	if(DistantChatService::initiateDistantChatConnexion( to_gxs_id,
+	                                                     from_gxs_id, pid,
+	                                                     error_code ))
+	{
+		DistantEndpoints ep; ep.from = from_gxs_id; ep.to = to_gxs_id;
+		mDistantGxsMap.insert(DEPMap::value_type(pid, ep));
+		return true;
+	}
+	return false;
+}
+
+bool p3ChatService::receiveGxsMail(const RsGxsMailItem&, const uint8_t* data, uint32_t dataSize)
+{
+	RsChatMsgItem* item = new RsChatMsgItem( const_cast<uint8_t*>(data),
+	                                         dataSize );
+	handleRecvChatMsgItem(item);
+	delete item;
+	return true;
+}
+
+bool p3ChatService::notifySendMailStatus(const RsGxsMailItem& originalMessage, GxsMailStatus status)
+{
+	if ( status != GxsMailStatus::RECEIPT_RECEIVED ) return true;
+
+	bool changed = false;
+
+	{
+		RS_STACK_MUTEX(mChatMtx);
+		auto it = privateOutgoingMap.find(originalMessage.mailId);
+		if( it != privateOutgoingMap.end() )
+		{
+			privateOutgoingMap.erase(it);
+			changed = true;
+		}
+	}
+
+	if(changed)
+	{
+		RsServer::notify()->notifyListChange(
+		            NOTIFY_LIST_PRIVATE_OUTGOING_CHAT, NOTIFY_TYPE_DEL );
+
+		IndicateConfigChanged();
+	}
+
+	return true;
+}
+
 bool p3ChatService::handleRecvChatMsgItem(RsChatMsgItem *& ci)
 {
 	time_t now = time(NULL);
+
+	{ // Check for duplicates
+		uint32_t sz = ci->serial_size();
+		std::vector<uint8_t> srz; srz.resize(sz);
+		ci->serialise(&srz[0], sz);
+		Sha1CheckSum hash = RsDirUtil::sha1sum(&srz[0], sz);
+		{
+			RS_STACK_MUTEX(recentlyReceivedMutex);
+			if( mRecentlyReceivedMessageHashes.find(hash) !=
+			        mRecentlyReceivedMessageHashes.end() )
+			{
+				std::cerr << "p3ChatService::handleRecvChatMsgItem(...) (II) "
+				          << "receiving distant message of hash " << hash
+				          << " more than once. Probably it has arrived  before "
+				          << "by other means." << std::endl;
+			delete ci; ci=NULL;
+			return true;
+			}
+			mRecentlyReceivedMessageHashes[hash] = now;
+		}
+	}
+
 	std::string name;
-    uint32_t popupChatFlag = RS_POPUP_CHAT;
+	uint32_t popupChatFlag = RS_POPUP_CHAT;

-    {
-        RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
+	{
+		RS_STACK_MUTEX(mChatMtx);

-        if(!locked_checkAndRebuildPartialMessage(ci))		// we make sure this call does not take control over the memory
-		return true ;					// message is a subpart of an existing message. So everything ok, but we need to return.
-    }
+		// we make sure this call does not take control over the memory
+		if(!locked_checkAndRebuildPartialMessage(ci)) return true;
+		    /* message is a subpart of an existing message.
+			 * So everything ok, but we need to return. */
+	}

-    // Check for security. This avoids bombing messages, and so on.
+	// Check for security. This avoids bombing messages, and so on.
+	if(!checkForMessageSecurity(ci)) return false;

-    if(!checkForMessageSecurity(ci))
-        return false ;
-
-    // If it's a lobby item, we need to bounce it and possibly check for timings etc.
-
-    if(!DistributedChatService::handleRecvChatLobbyMsgItem(ci))
-        return false ;
+	/* If it's a lobby item, we need to bounce it and possibly check for timings
+	 * etc. */
+	if(!DistributedChatService::handleRecvChatLobbyMsgItem(ci)) return false;

 #ifdef CHAT_DEBUG
-	std::cerr << "p3ChatService::receiveChatQueue() Item:";
-	std::cerr << std::endl;
+	std::cerr << "p3ChatService::receiveChatQueue() Item:" << std::endl;
 	ci->print(std::cerr);
-	std::cerr << std::endl;
-	std::cerr << "Got msg. Flags = " << ci->chatFlags << std::endl ;
+	std::cerr << std::endl << "Got msg. Flags = " << ci->chatFlags << std::endl;
 #endif

    // Now treat normal chat stuff such as avatar requests, except for chat lobbies.
@ -1087,6 +1168,25 @@ RsChatStatusItem *p3ChatService::makeOwnCustomStateStringItem()

 	return ci ;
 }
+
+void p3ChatService::cleanListOfReceivedMessageHashes()
+{
+	RS_STACK_MUTEX(recentlyReceivedMutex);
+
+	time_t now = time(NULL);
+
+	for( auto it = mRecentlyReceivedMessageHashes.begin();
+	     it != mRecentlyReceivedMessageHashes.end(); )
+		if( now > RECENTLY_RECEIVED_INTERVAL + it->second )
+		{
+			std::cerr << "p3MsgService(): cleanListOfReceivedMessageHashes("
+			          << "). Removing old hash " << it->first << ", aged "
+			          << now - it->second << " secs ago." << std::endl;
+
+			it = mRecentlyReceivedMessageHashes.erase(it);
+		}
+		else ++it;
+}
 RsChatAvatarItem *p3ChatService::makeOwnAvatarItem()
 {
 	RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
@ -1100,11 +1200,11 @@ RsChatAvatarItem *p3ChatService::makeOwnAvatarItem()

 void p3ChatService::sendAvatarJpegData(const RsPeerId& peer_id)
 {
-   #ifdef CHAT_DEBUG
-   std::cerr << "p3chatservice: sending requested for peer " << peer_id << ", data=" << (void*)_own_avatar << std::endl ;
-   #endif
+#ifdef CHAT_DEBUG
+	std::cerr << "p3chatservice: sending requested for peer " << peer_id << ", data=" << (void*)_own_avatar << std::endl ;
+#endif

-   if(_own_avatar != NULL)
+	if(_own_avatar != NULL)
 	{
 		RsChatAvatarItem *ci = makeOwnAvatarItem();
 		ci->PeerId(peer_id);
@ -1144,19 +1244,34 @@ bool p3ChatService::loadList(std::list<RsItem*>& load)

 	for(std::list<RsItem*>::const_iterator it(load.begin());it!=load.end();++it)
 	{
+		if(PrivateOugoingMapItem* om=dynamic_cast<PrivateOugoingMapItem*>(*it))
+		{
+			RS_STACK_MUTEX(mChatMtx);
+			for( auto& pair : om->store )
+			{
+				privateOutgoingMap.insert(
+				            outMP::value_type(pair.first,
+				                              new RsChatMsgItem(pair.second)) );
+			}
+
+			delete om; continue;
+		}
+
+
 		RsChatAvatarItem *ai = NULL ;

 		if(NULL != (ai = dynamic_cast<RsChatAvatarItem *>(*it)))
 		{
-			RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
+			RS_STACK_MUTEX(mChatMtx);

 			if(ai->image_size <= MAX_AVATAR_JPEG_SIZE)
 				_own_avatar = new AvatarInfo(ai->image_data,ai->image_size) ;
 			else
-				std::cerr << "Dropping avatar image, because its size is " << ai->image_size << ", and the maximum allowed size is " << MAX_AVATAR_JPEG_SIZE << std::endl;
+				std::cerr << "Dropping avatar image, because its size is "
+				          << ai->image_size << ", and the maximum allowed size "
+				          << "is " << MAX_AVATAR_JPEG_SIZE << std::endl;

 			delete *it;
-
 			continue;
 		}

@ -1164,40 +1279,42 @@ bool p3ChatService::loadList(std::list<RsItem*>& load)

 		if(NULL != (mitem = dynamic_cast<RsChatStatusItem *>(*it)))
 		{
-			RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
+			RS_STACK_MUTEX(mChatMtx);

 			_custom_status_string = mitem->status_string ;

 			delete *it;
-
 			continue;
 		}

-		RsPrivateChatMsgConfigItem *citem = NULL ;
-
-		if(NULL != (citem = dynamic_cast<RsPrivateChatMsgConfigItem *>(*it)))
+		/* TODO: G10h4ck 2017/02/27 this block is kept for retrocompatibility,
+		 * and will be used just first time, to load messages in the old format
+		 * should be removed in the following RS version */
+		if( RsPrivateChatMsgConfigItem *citem =
+		        dynamic_cast<RsPrivateChatMsgConfigItem *>(*it) )
 		{
-			RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
+			RS_STACK_MUTEX(mChatMtx);

-			if (citem->chatFlags & RS_CHAT_FLAG_PRIVATE) {
-				if (std::find(ssl_peers.begin(), ssl_peers.end(), citem->configPeerId) != ssl_peers.end()) {
+			if ( citem->chatFlags & RS_CHAT_FLAG_PRIVATE )
+			{
+				if ( std::find(ssl_peers.begin(), ssl_peers.end(),
+				               citem->configPeerId) != ssl_peers.end() )
+				{
 					RsChatMsgItem *ci = new RsChatMsgItem();
 					citem->get(ci);

-					if (citem->configFlags & RS_CHATMSG_CONFIGFLAG_INCOMING) {
+					if (citem->configFlags & RS_CHATMSG_CONFIGFLAG_INCOMING)
+					{
 						locked_storeIncomingMsg(ci);
-					} else {
-						privateOutgoingList.push_back(ci);
 					}
-				} else {
-					// no friends
+					else privateOutgoingMap.insert(
+					            outMP::value_type(RSRandom::random_u64(), ci) );
 				}
-			} else {
-				// ignore all other items
+				else { /* no friends */ }
 			}
+			else { /* ignore all other items */ }

 			delete *it;
-
 			continue;
 		}

@ -1228,21 +1345,18 @@ bool p3ChatService::saveList(bool& cleanup, std::list<RsItem*>& list)

 	mChatMtx.lock(); /****** MUTEX LOCKED *******/

+	PrivateOugoingMapItem* om =  new PrivateOugoingMapItem;
+	typedef std::map<uint64_t, RsChatMsgItem>::value_type vT;
+	for( auto& pair : privateOutgoingMap )
+		om->store.insert(vT(pair.first, *pair.second));
+	list.push_back(om);
+
+
 	RsChatStatusItem *di = new RsChatStatusItem ;
 	di->status_string = _custom_status_string ;
 	di->flags = RS_CHAT_FLAG_CUSTOM_STATE ;

-	list.push_back(di) ;
-
-	/* save outgoing private chat messages */
-    std::list<RsChatMsgItem *>::iterator it;
-	for (it = privateOutgoingList.begin(); it != privateOutgoingList.end(); it++) {
-		RsPrivateChatMsgConfigItem *ci = new RsPrivateChatMsgConfigItem;
-
-		ci->set(*it, (*it)->PeerId(), 0);
-
-		list.push_back(ci);
-	}
+	list.push_back(di);

 	DistributedChatService::addToSaveList(list) ;
 	DistantChatService::addToSaveList(list) ;
@ -1269,54 +1383,51 @@ RsSerialiser *p3ChatService::setupSerialiser()

 void p3ChatService::statusChange(const std::list<pqiServicePeer> &plist)
 {
-	std::list<pqiServicePeer>::const_iterator it;
-	for (it = plist.begin(); it != plist.end(); ++it) {
+	for (auto it = plist.cbegin(); it != plist.cend(); ++it)
+	{
 		if (it->actions & RS_SERVICE_PEER_CONNECTED) 
 		{
 			/* send the saved outgoing messages */
 			bool changed = false;

-			std::vector<RsChatMsgItem*> to_send ;
+			std::vector<RsChatMsgItem*> to_send;

-			if (privateOutgoingList.size()) 
 			{
-				RsStackMutex stack(mChatMtx); /********** STACK LOCKED MTX ******/
+				RS_STACK_MUTEX(mChatMtx);

-				RsPeerId ownId = mServiceCtrl->getOwnId();
-
-				std::list<RsChatMsgItem *>::iterator cit = privateOutgoingList.begin();
-				while (cit != privateOutgoingList.end()) {
-					RsChatMsgItem *c = *cit;
-
-					if (c->PeerId() == it->id) {
-                        //mHistoryMgr->addMessage(false, c->PeerId(), ownId, c);
+				for( auto cit = privateOutgoingMap.begin();
+				     cit != privateOutgoingMap.end(); )
+				{
+					RsChatMsgItem *c = cit->second;
+					if (c->PeerId() == it->id)
+					{
+						//mHistoryMgr->addMessage(false, c->PeerId(), ownId, c);

 						to_send.push_back(c) ;
-
 						changed = true;
-
-						cit = privateOutgoingList.erase(cit);
-
+						cit = privateOutgoingMap.erase(cit);
 						continue;
 					}

 					++cit;
 				}
-			} /* UNLOCKED */
+			}

-			for(uint32_t i=0;i<to_send.size();++i)
-            {
-                ChatMessage message;
-                initChatMessage(to_send[i], message);
-                message.incoming = false;
-                message.online = true;
-                RsServer::notify()->notifyChatMessage(message);
+			for(auto toIt = to_send.begin(); toIt != to_send.end(); ++toIt)
+			{
+				ChatMessage message;
+				initChatMessage(*toIt, message);
+				message.incoming = false;
+				message.online = true;
+				RsServer::notify()->notifyChatMessage(message);

-                checkSizeAndSendMessage(to_send[i]); // delete item
-            }
+				checkSizeAndSendMessage(*toIt); // delete item
+			}

-			if (changed) {
-				RsServer::notify()->notifyListChange(NOTIFY_LIST_PRIVATE_OUTGOING_CHAT, NOTIFY_TYPE_DEL);
+			if (changed)
+			{
+				RsServer::notify()->notifyListChange(
+				            NOTIFY_LIST_PRIVATE_OUTGOING_CHAT, NOTIFY_TYPE_DEL);

 				IndicateConfigChanged();
 			}
@ -1324,18 +1435,17 @@ void p3ChatService::statusChange(const std::list<pqiServicePeer> &plist)
 		else if (it->actions & RS_SERVICE_PEER_REMOVED) 
 		{
 			/* now handle remove */
-            mHistoryMgr->clear(ChatId(it->id));
+			mHistoryMgr->clear(ChatId(it->id));

-            std::list<RsChatMsgItem *>::iterator cit = privateOutgoingList.begin();
-            while (cit != privateOutgoingList.end()) {
-                RsChatMsgItem *c = *cit;
-                if (c->PeerId() == it->id) {
-                    cit = privateOutgoingList.erase(cit);
-                    continue;
-                }
-                ++cit;
-            }
-            IndicateConfigChanged();
+			RS_STACK_MUTEX(mChatMtx);
+			for ( auto cit = privateOutgoingMap.begin();
+			      cit != privateOutgoingMap.end(); )
+			{
+				RsChatMsgItem *c = cit->second;
+				if (c->PeerId() == it->id) cit = privateOutgoingMap.erase(cit);
+				else ++cit;
+			}
+			IndicateConfigChanged();
 		}
 	}
 }
--- a/libretroshare/src/chat/p3chatservice.h
+++ b/libretroshare/src/chat/p3chatservice.h
@ -37,6 +37,8 @@
 #include "chat/distantchat.h"
 #include "chat/distributedchat.h"
 #include "retroshare/rsmsgs.h"
+#include "services/p3gxsmails.h"
+#include "util/rsdeprecate.h"

 class p3ServiceControl;
 class p3LinkMgr;
@ -51,10 +53,12 @@ typedef RsPeerId ChatLobbyVirtualPeerId ;
  * This service uses rsnotify (callbacks librs clients (e.g. rs-gui))
  * @see NotifyBase
  */
-class p3ChatService: public p3Service, public DistantChatService, public DistributedChatService, public p3Config, public pqiServiceMonitor
+struct p3ChatService :
+        p3Service, DistantChatService, DistributedChatService, p3Config,
+        pqiServiceMonitor, GxsMailsClient
 {
-public:
-	p3ChatService(p3ServiceControl *cs, p3IdService *pids,p3LinkMgr *cm, p3HistoryMgr *historyMgr);
+	p3ChatService( p3ServiceControl *cs, p3IdService *pids,p3LinkMgr *cm,
+	               p3HistoryMgr *historyMgr, p3GxsMails& gxsMailService );

 	virtual RsServiceInfo getServiceInfo();

@ -66,7 +70,7 @@ public:
 		 * : notifyCustomState, notifyChatStatus, notifyPeerHasNewAvatar
 		 * @see NotifyBase
 		 */
-	virtual int   tick();
+	virtual int tick();

 	/*************** pqiMonitor callback ***********************/
 	virtual void statusChange(const std::list<pqiServicePeer> &plist);
@ -161,6 +165,20 @@ public:
 		 */
 	bool clearPrivateChatQueue(bool incoming, const RsPeerId &id);

+	virtual bool initiateDistantChatConnexion( const RsGxsId& to_gxs_id,
+	                                           const RsGxsId& from_gxs_id,
+	                                           DistantChatPeerId &pid,
+	                                           uint32_t& error_code );
+
+	/// @see GxsMailsClient::receiveGxsMail(...)
+	virtual bool receiveGxsMail( const RsGxsMailItem& /*originalMessage*/,
+	                             const uint8_t* data, uint32_t dataSize );
+
+	/// @see GxsMailsClient::notifySendMailStatus(...)
+	virtual bool notifySendMailStatus( const RsGxsMailItem& originalMessage,
+	                                   GxsMailStatus status );
+
+
 protected:
 	/************* from p3Config *******************/
 	virtual RsSerialiser *setupSerialiser() ;
@ -177,8 +195,9 @@ protected:

 	/// This is to be used by subclasses/parents to call IndicateConfigChanged()
 	virtual void triggerConfigSave()  { IndicateConfigChanged() ; }
+
 	/// Same, for storing messages in incoming list
-	virtual void locked_storeIncomingMsg(RsChatMsgItem *) ;
+	RS_DEPRECATED virtual void locked_storeIncomingMsg(RsChatMsgItem *) ;

 private:
 	RsMutex mChatMtx;
@ -231,7 +250,9 @@ private:
 	p3LinkMgr *mLinkMgr;
 	p3HistoryMgr *mHistoryMgr;

-	std::list<RsChatMsgItem *> privateOutgoingList; // messages waiting to be send when peer comes online
+	/// messages waiting to be send when peer comes online
+	typedef std::map<uint64_t, RsChatMsgItem *> outMP;
+	outMP privateOutgoingMap;

 	AvatarInfo *_own_avatar ;
 	std::map<RsPeerId,AvatarInfo *> _avatars ;
@ -240,7 +261,19 @@ private:
 	std::string _custom_status_string ;
 	std::map<RsPeerId,StateStringInfo> _state_strings ;

-	RsChatSerialiser *_serializer ;
+	RsChatSerialiser *_serializer;
+
+	struct DistantEndpoints { RsGxsId from; RsGxsId to; };
+	typedef std::map<DistantChatPeerId, DistantEndpoints> DEPMap;
+	DEPMap mDistantGxsMap;
+	p3GxsMails& mGxsTransport;
+
+	/** As we have multiple backends duplicates are possible, keep track of
+	 * recently received messages hashes for at least 2h to avoid them */
+	const static uint32_t RECENTLY_RECEIVED_INTERVAL = 2*3600;
+	std::map<Sha1CheckSum, uint32_t> mRecentlyReceivedMessageHashes;
+	RsMutex recentlyReceivedMutex;
+	void cleanListOfReceivedMessageHashes();
 };

 class p3ChatService::StateStringInfo
--- a/libretroshare/src/chat/rschatitems.h
+++ b/libretroshare/src/chat/rschatitems.h
@ -75,6 +75,7 @@ const uint8_t RS_PKT_SUBTYPE_CHAT_LOBBY_SIGNED_MSG     	  = 0x17 ;
 const uint8_t RS_PKT_SUBTYPE_CHAT_LOBBY_SIGNED_EVENT      = 0x18 ;
 const uint8_t RS_PKT_SUBTYPE_CHAT_LOBBY_LIST              = 0x19 ;
 const uint8_t RS_PKT_SUBTYPE_CHAT_LOBBY_INVITE       	  = 0x1A ;
+const uint8_t RS_PKT_SUBTYPE_OUTGOING_MAP                 = 0x1B ;

 typedef uint64_t 		ChatLobbyId ;
 typedef uint64_t 		ChatLobbyMsgId ;
@ -286,30 +287,32 @@ class RsChatLobbyInviteItem: public RsChatItem
 * For saving incoming and outgoing chat msgs
 * @see p3ChatService
 */
-class RsPrivateChatMsgConfigItem: public RsChatItem
+struct RsPrivateChatMsgConfigItem : RsChatItem
 {
-	public:
-		RsPrivateChatMsgConfigItem() :RsChatItem(RS_PKT_SUBTYPE_PRIVATECHATMSG_CONFIG) {}
-		RsPrivateChatMsgConfigItem(void *data,uint32_t size) ; // deserialization
+	RsPrivateChatMsgConfigItem() :RsChatItem(RS_PKT_SUBTYPE_PRIVATECHATMSG_CONFIG) {}
+	RsPrivateChatMsgConfigItem(void *data,uint32_t size) ; // deserialization

-		virtual ~RsPrivateChatMsgConfigItem() {}
-		virtual void clear() {}
-		virtual std::ostream& print(std::ostream &out, uint16_t indent = 0);
+	virtual ~RsPrivateChatMsgConfigItem() {}
+	virtual void clear() {}
+	virtual std::ostream& print(std::ostream &out, uint16_t indent = 0);

-		virtual bool serialise(void *data,uint32_t& size) ;	// Isn't it better that items can serialize themselves ?
-		virtual uint32_t serial_size() ; 							// deserialise is handled using a constructor
+	virtual bool serialise(void *data,uint32_t& size);
+	virtual uint32_t serial_size();
+	/* Deserialize is handled using a constructor,it would be better have a
+	 * deserialize method as constructor cannot fails while deserialization can.
+	 */

-		/* set data from RsChatMsgItem to RsPrivateChatMsgConfigItem */
-		void set(RsChatMsgItem *ci, const RsPeerId &peerId, uint32_t confFlags);
-		/* get data from RsPrivateChatMsgConfigItem to RsChatMsgItem */
-		void get(RsChatMsgItem *ci);
+	/* set data from RsChatMsgItem to RsPrivateChatMsgConfigItem */
+	void set(RsChatMsgItem *ci, const RsPeerId &peerId, uint32_t confFlags);
+	/* get data from RsPrivateChatMsgConfigItem to RsChatMsgItem */
+	void get(RsChatMsgItem *ci);

-		RsPeerId configPeerId;
-		uint32_t chatFlags;
-		uint32_t configFlags;
-		uint32_t sendTime;
-		std::string message;
-		uint32_t recvTime;
+	RsPeerId configPeerId;
+	uint32_t chatFlags;
+	uint32_t configFlags;
+	uint32_t sendTime;
+	std::string message;
+	uint32_t recvTime;
 };
 class RsPrivateChatDistantInviteConfigItem: public RsChatItem
 {
@ -413,6 +416,126 @@ class RsChatDHPublicKeyItem: public RsChatItem
 		const RsChatDHPublicKeyItem& operator=(const RsChatDHPublicKeyItem&) { return *this ;}
 };

+
+struct PrivateOugoingMapItem : RsChatItem
+{
+	PrivateOugoingMapItem() : RsChatItem(RS_PKT_SUBTYPE_OUTGOING_MAP) {}
+
+	uint32_t serial_size()
+	{
+		uint32_t s = 8; /* header */
+		s += 4; // number of entries
+		for( auto entry : store )
+		{
+			s += 8; // key size
+			s += entry.second.serial_size();
+		}
+		return s;
+	}
+	bool serialise(void* data, uint32_t& pktsize)
+	{
+		uint32_t tlvsize = serial_size();
+		uint32_t offset = 0;
+
+		if (pktsize < tlvsize) return false; /* not enough space */
+
+		pktsize = tlvsize;
+
+		bool ok = true;
+
+		ok = ok && setRsItemHeader(data, tlvsize, PacketId(), tlvsize)
+		        && (offset += 8);
+
+		ok = ok && setRawUInt32(data, tlvsize, &offset, store.size());
+
+		for( auto entry : store )
+		{
+			ok = ok && setRawUInt64(data, tlvsize, &offset, entry.first);
+
+			uint8_t* hdrPtr = static_cast<uint8_t*>(data) + offset;
+			uint32_t tmpsize = entry.second.serial_size();
+			ok = ok && entry.second.serialise(hdrPtr, tmpsize);
+		}
+
+		if (offset != tlvsize)
+		{
+			ok = false;
+			std::cerr << "PrivateOugoingMapItem::serialise() Size Error!"
+			          << std::endl;
+		}
+
+		return ok;
+	}
+	PrivateOugoingMapItem* deserialise(const uint8_t* data, uint32_t& pktsize)
+	{
+		/* get the type and size */
+		uint8_t* dataPtr = const_cast<uint8_t*>(data);
+		uint32_t rstype = getRsItemId(dataPtr);
+		uint32_t rssize = getRsItemSize(dataPtr);
+
+		uint32_t offset = 0;
+
+		if ((RS_PKT_VERSION_SERVICE != getRsItemVersion(rstype)) ||
+		        (RS_SERVICE_TYPE_CHAT != getRsItemService(rstype)) ||
+		        (RS_PKT_SUBTYPE_OUTGOING_MAP != getRsItemSubType(rstype))
+		        ) return NULL; /* wrong type */
+
+		if (pktsize < rssize) return NULL; /* check size not enough data */
+
+		/* set the packet length */
+		pktsize = rssize;
+
+		bool ok = true;
+
+		/* ready to load */
+		PrivateOugoingMapItem* item = new PrivateOugoingMapItem();
+
+		/* skip the header */
+		offset += 8;
+
+		// get map size first */
+		uint32_t s = 0;
+		ok = ok && getRawUInt32(dataPtr, rssize, &offset, &s);
+
+		for(uint32_t i=0; i<s && ok; ++i)
+		{
+			uint64_t msgId;
+
+			ok = ok && getRawUInt64(dataPtr, rssize, &offset, &msgId);
+
+			uint8_t* hdrPtr = const_cast<uint8_t*>(data); hdrPtr += offset;
+			uint32_t tmpSize = getRsItemSize(hdrPtr);
+			RsChatMsgItem msgItem(hdrPtr, tmpSize);
+			item->store.insert(std::make_pair(msgId, msgItem));
+		}
+
+		if (offset != rssize)
+		{
+			/* error */
+			std::cerr << "(EE) size error in packet deserialisation: p3MsgItem,"
+			          << " subtype " << getRsItemSubType(rstype) << ". offset="
+			          << offset << " != rssize=" << rssize << std::endl;
+			delete item;
+			return NULL;
+		}
+
+		if (!ok)
+		{
+			std::cerr << "(EE) size error in packet deserialisation: p3MsgItem,"
+			          << " subtype " << getRsItemSubType(rstype) << std::endl;
+			delete item;
+			return NULL;
+		}
+
+		return item;
+	}
+
+	virtual std::ostream& print(std::ostream &out, uint16_t /*indent*/ = 0)
+	{ return out << "PrivateOugoingMapItem store size: " << store.size(); }
+
+	std::map<uint64_t, RsChatMsgItem> store;
+};
+
 class RsChatSerialiser: public RsSerialType
 {
 	public:
--- a/libretroshare/src/rsserver/rsinit.cc
+++ b/libretroshare/src/rsserver/rsinit.cc
@ -1511,7 +1511,8 @@ int RsServer::StartupRetroShare()
 	mDisc = new p3discovery2(mPeerMgr, mLinkMgr, mNetMgr, serviceCtrl);
 	mHeart = new p3heartbeat(serviceCtrl, pqih);
 	msgSrv = new p3MsgService( serviceCtrl, mGxsIdService, *mGxsMails );
-	chatSrv = new p3ChatService(serviceCtrl,mGxsIdService, mLinkMgr, mHistoryMgr);
+	chatSrv = new p3ChatService( serviceCtrl,mGxsIdService, mLinkMgr,
+	                             mHistoryMgr, *mGxsMails );
 	mStatusSrv = new p3StatusService(serviceCtrl);

 #ifdef ENABLE_GROUTER
--- a/libretroshare/src/serialiser/rsgxsmailitems.h
+++ b/libretroshare/src/serialiser/rsgxsmailitems.h
@ -29,9 +29,10 @@
 /// Subservices identifiers (like port for TCP)
 enum class GxsMailSubServices : uint16_t
 {
-	UNKNOWN = 0,
-	TEST_SERVICE = 1,
-	P3_MSG_SERVICE = 2
+	UNKNOWN         = 0,
+	TEST_SERVICE    = 1,
+	P3_MSG_SERVICE  = 2,
+	P3_CHAT_SERVICE = 3
 };

 /// Values must fit into uint8_t