路由相关信令和协议设计

enum BuddyListCmdID {
  // ...... 暂时省略无关信令
  CID_BUDDY_LIST_USERS_STATUS_REQUEST = 522,
  CID_BUDDY_LIST_USERS_STATUS_RESPONSE = 523,
  // ...... 暂时省略无关信令
};

message IMUsersStatReq{
	//cmd id:		0x020a
	required uint32 user_id = 1;
	repeated uint32 user_id_list = 2;
	optional bytes attach_data = 20;
}

message IMUsersStatRsp{
	//cmd id:		0x020b
	required uint32 user_id = 1;
	repeated IM.BaseDefine.UserStat user_stat_list = 2;
	optional bytes attach_data = 20;
}

enum UserStatType{
	USER_STATUS_ONLINE 	= 1;
	USER_STATUS_OFFLINE	= 2;
	USER_STATUS_LEAVE	= 3;
}

流程图

具体代码逻辑

1. 在 g_user_map 中根据 user_id 查找对应的状态
2. 如果不在列表设置为下线状态；如果在列表设置为对应的状态；
3. 组包回复

void CRouteConn::_HandleUsersStatusRequest(CImPdu* pPdu)
{
    IM::Buddy::IMUsersStatReq msg;
    CHECK_PB_PARSE_MSG(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()));

	uint32_t request_id = msg.user_id();
	uint32_t query_count = msg.user_id_list_size();
	log("HandleUserStatusReq, req_id=%u, query_count=%u ", request_id, query_count);

    IM::Buddy::IMUsersStatRsp msg2;
    msg2.set_user_id(request_id);
    msg2.set_attach_data(msg.attach_data());
    list<user_stat_t> result_list;
	user_stat_t status;
    for(uint32_t i = 0; i < query_count; i++)
	{
        IM::BaseDefine::UserStat* user_stat = msg2.add_user_stat_list();
        uint32_t user_id = msg.user_id_list(i);
        user_stat->set_user_id(user_id);
        CUserInfo* pUser = GetUserInfo(user_id);
        if (pUser) {
            user_stat->set_status((::IM::BaseDefine::UserStatType) pUser->GetStatus()) ;
        }
		else
		{
            user_stat->set_status(USER_STATUS_OFFLINE) ;
		}
	}

	// send back query user status
    CImPdu pdu;
    pdu.SetPBMsg(&msg2);
    pdu.SetServiceId(SID_BUDDY_LIST);
    pdu.SetCommandId(CID_BUDDY_LIST_USERS_STATUS_RESPONSE);
	pdu.SetSeqNum(pPdu->GetSeqNum());
	SendPdu(&pdu);
}

CUserInfo* GetUserInfo(uint32_t user_id)
{
    CUserInfo* pUser = NULL;
    UserInfoMap_t::iterator it = g_user_map.find(user_id);
    if (it != g_user_map.end()) {
        pUser = it->second;
    }
    
    return pUser;
}