BOOL MessageModule_Impl::getHistoryMessage(IN const std::string& sId, IN UInt32 nMsgCount
, IN BOOL scrollBottom, OUT std::vector<MessageEntity>& msgList)
{
//step 0 get message id from cache
module::SessionEntity sessEntity;
if (!module::getSessionModule()->getSessionEntityBySId(sId, sessEntity))
{
LOGA__(ERR,"getSessionEntityBySId failed,sessionId:%s",util::stringToCString(sId));
return FALSE;
}
UInt32 topMsgId = _getSessionTopMsgId(sId);
if (0 == topMsgId)
{
topMsgId = sessEntity.latestmsgId;
}
//step 1 query history message from local db
std::vector<MessageEntity> msgListTemp;
module::getDatabaseModule()->sqlGetHistoryMessage(sId, topMsgId, nMsgCount, msgListTemp);
//step 2 compare the topMsgId to latest local db msgId and check which is sequential
if (!msgListTemp.empty())
{
//todo 还有优化的余地，取出的比msgCount+1的数量，看是否连续的。
MessageEntity& latestMsgEntity = msgListTemp.front();
MessageEntity& firstMsgEntity = msgListTemp.back();
if ((topMsgId == latestMsgEntity.msgId) && ((firstMsgEntity.msgId + nMsgCount - 1) == latestMsgEntity.msgId))
{
msgList = msgListTemp;
setSessionTopMsgId(sId, firstMsgEntity.msgId-1);
return TRUE;
}
}
//final fetch history message from server db
imcore::IMLibCoreStartOperationWithLambda(
[=]()mutable
{
LOG__(APP, _T("IMGetMsgListReq history message ,sessionId = %s,sessionName=%s,last msgId = %d,Count = %d")
, util::stringToCString(sessEntity.sessionID)
,sessEntity.getName()
,topMsgId, nMsgCount);
IM::Message::IMGetMsgListReq imGetMsgListReq;
imGetMsgListReq.set_user_id(module::getSysConfigModule()->userId());
imGetMsgListReq.set_session_type((IM::BaseDefine::SessionType)sessEntity.sessionType);
imGetMsgListReq.set_session_id(sessEntity.getOriginIntegerSessionId());
imGetMsgListReq.set_msg_id_begin(topMsgId);//服务端是包含当前的那一条的
imGetMsgListReq.set_msg_cnt(nMsgCount);
UInt16 reserved = (TRUE == scrollBottom) ? imcore::RESERVED_TYPE_HISTORY_SCROLLBOTTOM_MESSAGE : imcore::RESERVED_TYPE_HISTORY_MESSAGE;
module::getTcpClientModule()->sendPacket(IM::BaseDefine::SID_MSG
, IM::BaseDefine::CID_MSG_LIST_REQUEST, reserved
, &imGetMsgListReq);
}
);
return FALSE;
}
uint32_t ClientConn::getMsgList(uint32_t nUserId, IM::BaseDefine::SessionType nType, uint32_t nPeerId, uint32_t nMsgId, uint32_t nMsgCnt)
{
CImPdu cPdu;
IM::Message::IMGetMsgListReq msg;
msg.set_user_id(nUserId);
msg.set_session_type(nType);
msg.set_session_id(nPeerId);
msg.set_msg_id_begin(nMsgId);
msg.set_msg_cnt(nMsgCnt);
cPdu.SetPBMsg(&msg);
cPdu.SetServiceId(IM::BaseDefine::SID_MSG);
cPdu.SetCommandId(IM::BaseDefine::CID_MSG_LIST_REQUEST);
uint32_t nSeqNo = m_pSeqAlloctor->getSeq(ALLOCTOR_PACKET);
cPdu.SetSeqNum(nSeqNo);
SendPdu(&cPdu);
return nSeqNo;
}