最近联系人相关信令和协议设计

enum BuddyListCmdID {
  CID_BUDDY_LIST_RECENT_CONTACT_SESSION_REQUEST = 513,
  CID_BUDDY_LIST_RECENT_CONTACT_SESSION_RESPONSE = 514,
  };

流程图

1. 根据最新的时间戳查找最新的会话
2. 更新客户端的会话时间

/**
     *  获取最近会话接口
     *
     *  @param pPdu      收到的packet包指针
     *  @param conn_uuid 该包过来的socket 描述符
     */
    void getRecentSession(CImPdu* pPdu, uint32_t conn_uuid)
    {
        
        IM::Buddy::IMRecentContactSessionReq msg;
        IM::Buddy::IMRecentContactSessionRsp msgResp;
        if(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()))
        {
            CImPdu* pPduResp = new CImPdu;
        
            uint32_t nUserId = msg.user_id();
            uint32_t nLastTime = msg.latest_update_time();
            
            //获取最近联系人列表
            list<IM::BaseDefine::ContactSessionInfo> lsContactList;
            CSessionModel::getInstance()->getRecentSession(nUserId, nLastTime, lsContactList);
            msgResp.set_user_id(nUserId);
            for(auto it=lsContactList.begin(); it!=lsContactList.end(); ++it)
            {
                IM::BaseDefine::ContactSessionInfo* pContact = msgResp.add_contact_session_list();
    //            *pContact = *it;
                pContact->set_session_id(it->session_id());
                pContact->set_session_type(it->session_type());
                pContact->set_session_status(it->session_status());
                pContact->set_updated_time(it->updated_time());
                pContact->set_latest_msg_id(it->latest_msg_id());
                pContact->set_latest_msg_data(it->latest_msg_data());
                pContact->set_latest_msg_type(it->latest_msg_type());
                pContact->set_latest_msg_from_user_id(it->latest_msg_from_user_id());
            }
            
            log("userId=%u, last_time=%u, count=%u", nUserId, nLastTime, msgResp.contact_session_list_size());
            
            msgResp.set_attach_data(msg.attach_data());
            pPduResp->SetPBMsg(&msgResp);
            pPduResp->SetSeqNum(pPdu->GetSeqNum());
            pPduResp->SetServiceId(IM::BaseDefine::SID_BUDDY_LIST);
            pPduResp->SetCommandId(IM::BaseDefine::CID_BUDDY_LIST_RECENT_CONTACT_SESSION_RESPONSE);
            CProxyConn::AddResponsePdu(conn_uuid, pPduResp);
        }
        else
        {
            log("parse pb failed");
        }
    }

void CSessionModel::getRecentSession(uint32_t nUserId, uint32_t lastTime, list<IM::BaseDefine::ContactSessionInfo>& lsContact)
{
    CDBManager* pDBManager = CDBManager::getInstance();
    CDBConn* pDBConn = pDBManager->GetDBConn("teamtalk_slave");
    if (pDBConn)
    {
        string strSql = "select * from IMRecentSession where userId = " + int2string(nUserId) + " and status = 0 and updated >" + int2string(lastTime) + " order by updated desc limit 100";
        
        CResultSet* pResultSet = pDBConn->ExecuteQuery(strSql.c_str());
        if (pResultSet)
        {
            while (pResultSet->Next())
            {
                IM::BaseDefine::ContactSessionInfo cRelate;
                uint32_t nPeerId = pResultSet->GetInt("peerId");
                cRelate.set_session_id(nPeerId);
                cRelate.set_session_status(::IM::BaseDefine::SessionStatusType(pResultSet->GetInt("status")));
                
                IM::BaseDefine::SessionType nSessionType = IM::BaseDefine::SessionType(pResultSet->GetInt("type"));
                if(IM::BaseDefine::SessionType_IsValid(nSessionType))
                {
                    cRelate.set_session_type(IM::BaseDefine::SessionType(nSessionType));
                    cRelate.set_updated_time(pResultSet->GetInt("updated"));
                    lsContact.push_back(cRelate);
                }
                else
                {
                    log("invalid sessionType. userId=%u, peerId=%u, sessionType=%u", nUserId, nPeerId, nSessionType);
                }
            }
            delete pResultSet;
        }
        else
        {
            log("no result set for sql: %s", strSql.c_str());
        }
        pDBManager->RelDBConn(pDBConn);
        if(!lsContact.empty())
        {
            fillSessionMsg(nUserId, lsContact);
        }
    }
    else
    {
        log("no db connection for teamtalk_slave");
    }
}