TeamTalk消息服务器学习

jack学编程2024-09-05 18:03

msg_server发送消息

信令

//service id  0x0003
message IMMsgData{
	//cmd id:		0x0301
	required uint32 from_user_id = 1;				//消息发送方
	required uint32 to_session_id = 2;				//消息接受方
	required uint32 msg_id = 3; // 非常重要：由谁产生？答：redis具体见下文
	required uint32 create_time = 4; 
	required IM.BaseDefine.MsgType msg_type = 5; // 单聊或者群聊
	required bytes msg_data = 6;
	optional bytes attach_data = 20;
}

message IMMsgDataAck{
	//cmd id:		0x0302
	required uint32 user_id = 1;			//发送此信令的用户id
	required uint32 session_id = 2;				
	required uint32 msg_id = 3;
	required IM.BaseDefine.SessionType session_type = 4;
}

流程图：

客户端A（葡萄）发送消息给客户端B（香蕉），信令为CID_MSG_DATA，msg_server收到后调用 CMsgConn::_HandleClientMsgData 函数

void CMsgConn::HandlePdu(CImPdu* pPdu)
{
	// request authorization check
	if (pPdu->GetCommandId() != CID_LOGIN_REQ_USERLOGIN && !IsOpen() && IsKickOff()) {
        log("HandlePdu, wrong msg. ");
        throw CPduException(pPdu->GetServiceId(), pPdu->GetCommandId(), ERROR_CODE_WRONG_SERVICE_ID, "HandlePdu error, user not login. ");
		return;
    }
	switch (pPdu->GetCommandId()) {
        // ...... 省略无关逻辑 
        case CID_MSG_DATA:
            _HandleClientMsgData(pPdu);
            break;
        case CID_MSG_DATA_ACK:
            _HandleClientMsgDataAck(pPdu);
            break;
        // ...... 省略无关逻辑 
        default:
            log("wrong msg, cmd id=%d, user id=%u. ", pPdu->GetCommandId(), GetUserId());
            break;
	}
}

void CMsgConn::_HandleClientMsgData(CImPdu* pPdu)
{
    IM::Message::IMMsgData msg;
    CHECK_PB_PARSE_MSG(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()));
	if (msg.msg_data().length() == 0) {
		log("discard an empty message, uid=%u ", GetUserId());
		return;
	}

	if (m_msg_cnt_per_sec >= MAX_MSG_CNT_PER_SECOND) {
		log("!!!too much msg cnt in one second, uid=%u ", GetUserId());
		return;
	}
    
    if (msg.from_user_id() == msg.to_session_id() && CHECK_MSG_TYPE_SINGLE(msg.msg_type()))
    {
        log("!!!from_user_id == to_user_id. ");
        return;
    }

	m_msg_cnt_per_sec++;

	uint32_t to_session_id = msg.to_session_id();
    uint32_t msg_id = msg.msg_id();
	uint8_t msg_type = msg.msg_type();
    string msg_data = msg.msg_data();

	if (g_log_msg_toggle) {
		log("HandleClientMsgData, %d->%d, msg_type=%u, msg_id=%u. ", GetUserId(), to_session_id, msg_type, msg_id);
	}

	uint32_t cur_time = time(NULL);
    CDbAttachData attach_data(ATTACH_TYPE_HANDLE, m_handle, 0);
    msg.set_from_user_id(GetUserId());
    msg.set_create_time(cur_time);
    msg.set_attach_data(attach_data.GetBuffer(), attach_data.GetLength());
    pPdu->SetPBMsg(&msg);
	// send to DB storage server
	CDBServConn* pDbConn = get_db_serv_conn();
	if (pDbConn) {
		pDbConn->SendPdu(pPdu);
	}
}

该函数直接将数据包转发给db_proxy_server，db_proxy_server有一个map来映射信令所对应的处理函数。db_proxy_server收到信令为CID_MSG_DATA，后调用 DB_PROXY::sendMessage。

该函数主要做：

  1. 创建会话ID，并且两个会话ID独立

    nSessionId = CSessionModel::getInstance()->addSession(nFromId, nToId, IM::BaseDefine::SESSION_TYPE_SINGLE);

    nPeerSessionId = CSessionModel::getInstance()->getSessionId(nToId, nFromId, IM::BaseDefine::SESSION_TYPE_SINGLE, false);

  2. 创建关系ID

    uint32_t nRelateId = CRelationModel::getInstance()->getRelationId(nFromId, nToId, true);

  3. 生成消息ID (msg_id)，写入消息到数据库

    nMsgId = pMsgModel->getMsgId(nRelateId);
    if(nMsgId != INVALID_VALUE)
    {
    pMsgModel->sendMessage(nRelateId, nFromId, nToId, nMsgType, nCreateTime, nMsgId, (string&)msg.msg_data());
    CSessionModel::getInstance()->updateSession(nSessionId, nNow);
    CSessionModel::getInstance()->updateSession(nPeerSessionId, nNow);
    }

msg_id：两个人之间的映射关系。如果按照时间排列，两个客户端之间的时间可能不一样，所以按照序号生成消息id。

  1. 每条消息id唯一

  2. 使用redis 生成消息 id

    uint32_t CMessageModel::getMsgId(uint32_t nRelateId)
    {
    uint32_t nMsgId = 0;
    CacheManager* pCacheManager = CacheManager::getInstance();
    CacheConn* pCacheConn = pCacheManager->GetCacheConn("unread");
    if(pCacheConn)
    {
    string strKey = "msg_id_" + int2string(nRelateId);
    nMsgId = pCacheConn->incrBy(strKey, 1);
    pCacheManager->RelCacheConn(pCacheConn);
    }
    return nMsgId;
    }

  3. db_proxy_server 回复 msg_server

    // message content
    m_handler_map.insert(make_pair(uint32_t(CID_MSG_DATA), DB_PROXY::sendMessage));

    void sendMessage(CImPdu* pPdu, uint32_t conn_uuid)
    {
    IM::Message::IMMsgData msg;
    if(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()))
    {
    uint32_t nFromId = msg.from_user_id();
    uint32_t nToId = msg.to_session_id();
    uint32_t nCreateTime = msg.create_time();
    IM::BaseDefine::MsgType nMsgType = msg.msg_type();
    uint32_t nMsgLen = msg.msg_data().length();

             uint32_t nNow = (uint32_t)time(NULL);
         if (IM::BaseDefine::MsgType_IsValid(nMsgType))
         {
             if(nMsgLen != 0)
             {
                 CImPdu* pPduResp = new CImPdu;

                 uint32_t nMsgId = INVALID_VALUE;
                 uint32_t nSessionId = INVALID_VALUE;
                 uint32_t nPeerSessionId = INVALID_VALUE;

                 CMessageModel* pMsgModel = CMessageModel::getInstance();
                 CGroupMessageModel* pGroupMsgModel = CGroupMessageModel::getInstance();
                 if(nMsgType == IM::BaseDefine::MSG_TYPE_GROUP_TEXT) {
                      // ...... 省略无关逻辑 
                 } else if (nMsgType == IM::BaseDefine::MSG_TYPE_GROUP_AUDIO) {
                      // ...... 省略无关逻辑 
                 } else if(nMsgType== IM::BaseDefine::MSG_TYPE_SINGLE_TEXT) {
                     if (nFromId != nToId) {
                         nSessionId = CSessionModel::getInstance()->getSessionId(nFromId, nToId, IM::BaseDefine::SESSION_TYPE_SINGLE, false);
                         if (INVALID_VALUE == nSessionId) {
                         	// 创建会话
                             nSessionId = CSessionModel::getInstance()->addSession(nFromId, nToId, IM::BaseDefine::SESSION_TYPE_SINGLE);
                         }
                         nPeerSessionId = CSessionModel::getInstance()->getSessionId(nToId, nFromId, IM::BaseDefine::SESSION_TYPE_SINGLE, false);
                         if(INVALID_VALUE ==  nPeerSessionId)
                         {
                         	// 创建会话关系ID
                             nSessionId = CSessionModel::getInstance()->addSession(nToId, nFromId, IM::BaseDefine::SESSION_TYPE_SINGLE);
                         }
                         uint32_t nRelateId = CRelationModel::getInstance()->getRelationId(nFromId, nToId, true);
                         if(nSessionId != INVALID_VALUE && nRelateId != INVALID_VALUE)
                         {
                             nMsgId = pMsgModel->getMsgId(nRelateId);
                             if(nMsgId != INVALID_VALUE)
                             {
                             	// 写入消息到数据库
                                 pMsgModel->sendMessage(nRelateId, nFromId, nToId, nMsgType, nCreateTime, nMsgId, (string&)msg.msg_data());
                                 CSessionModel::getInstance()->updateSession(nSessionId, nNow);
                                 CSessionModel::getInstance()->updateSession(nPeerSessionId, nNow);
                             }
                             else
                             {
                                 log("msgId is invalid. fromId=%u, toId=%u, nRelateId=%u, nSessionId=%u, nMsgType=%u", nFromId, nToId, nRelateId, nSessionId, nMsgType);
                             }
                         }
                         else{
                             log("sessionId or relateId is invalid. fromId=%u, toId=%u, nRelateId=%u, nSessionId=%u, nMsgType=%u", nFromId, nToId, nRelateId, nSessionId, nMsgType);
                         }
                     }
                     else
                     {
                         log("send msg to self. fromId=%u, toId=%u, msgType=%u", nFromId, nToId, nMsgType);
                     }
                     
                 } else if(nMsgType == IM::BaseDefine::MSG_TYPE_SINGLE_AUDIO) {
                     // ...... 省略无关逻辑 
                 }

                 log("fromId=%u, toId=%u, type=%u, msgId=%u, sessionId=%u", nFromId, nToId, nMsgType, nMsgId, nSessionId);

                 msg.set_msg_id(nMsgId);
                 pPduResp->SetPBMsg(&msg);
                 pPduResp->SetSeqNum(pPdu->GetSeqNum());
                 pPduResp->SetServiceId(IM::BaseDefine::SID_MSG);
                 pPduResp->SetCommandId(IM::BaseDefine::CID_MSG_DATA);
                 CProxyConn::AddResponsePdu(conn_uuid, pPduResp);
             }
             else
             {
                 log("msgLen error. fromId=%u, toId=%u, msgType=%u", nFromId, nToId, nMsgType);
             }
         }
         else
         {
             log("invalid msgType.fromId=%u, toId=%u, msgType=%u", nFromId, nToId, nMsgType);
         }
     }
     else
     {
         log("parse pb failed");
     }
 }

msg_server收到CID_MSG_DATA信令后调用 CDBServConn::_HandleMsgData 函数

void CDBServConn::HandlePdu(CImPdu* pPdu)
{
	switch (pPdu->GetCommandId()) {
        // ...... 省略无关逻辑 
        case CID_MSG_DATA:
            _HandleMsgData(pPdu);
            break;
        // ...... 省略无关逻辑 
        default:
            log("db server, wrong cmd id=%d ", pPdu->GetCommandId());
	}
}

CDBServConn::_HandleMsgData 处理消息有三点

  1. 首先 ack 客户端

  2. 然后发送到route_server广播

  3. 如果有多端登录，也要广播给其他客户端

    void CDBServConn::_HandleMsgData(CImPdu *pPdu)
    {
    IM::Message::IMMsgData msg;
    CHECK_PB_PARSE_MSG(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()));
    if (CHECK_MSG_TYPE_GROUP(msg.msg_type())) {
    s_group_chat->HandleGroupMessage(pPdu);
    return;
    }

     uint32_t from_user_id = msg.from_user_id();
 uint32_t to_user_id = msg.to_session_id();
 uint32_t msg_id = msg.msg_id();
 if (msg_id == 0) {
     log("HandleMsgData, write db failed, %u->%u.", from_user_id, to_user_id);
     return;
 }
 
 uint8_t msg_type = msg.msg_type();
 CDbAttachData attach_data((uchar_t*)msg.attach_data().c_str(), msg.attach_data().length());
 uint32_t handle = attach_data.GetHandle();
 
 log("HandleMsgData, from_user_id=%u, to_user_id=%u, msg_id=%u.", from_user_id, to_user_id, msg_id);
 
 CMsgConn* pMsgConn = CImUserManager::GetInstance()->GetMsgConnByHandle(from_user_id, attach_data.GetHandle());
 if (pMsgConn)
 {
     IM::Message::IMMsgDataAck msg2;
     msg2.set_user_id(from_user_id);
     msg2.set_msg_id(msg_id);
     msg2.set_session_id(to_user_id);
     msg2.set_session_type(::IM::BaseDefine::SESSION_TYPE_SINGLE);
     CImPdu pdu;
     pdu.SetPBMsg(&msg2);
     pdu.SetServiceId(SID_MSG);
     pdu.SetCommandId(CID_MSG_DATA_ACK);
     pdu.SetSeqNum(pPdu->GetSeqNum());
     pMsgConn->SendPdu(&pdu);
 }
 
 CRouteServConn* pRouteConn = get_route_serv_conn();
 if (pRouteConn) {
     pRouteConn->SendPdu(pPdu);
 }
 
 msg.clear_attach_data();
 pPdu->SetPBMsg(&msg);
 CImUser* pFromImUser = CImUserManager::GetInstance()->GetImUserById(from_user_id);
 CImUser* pToImUser = CImUserManager::GetInstance()->GetImUserById(to_user_id);
 pPdu->SetSeqNum(0);
 if (pFromImUser) {
     pFromImUser->BroadcastClientMsgData(pPdu, msg_id, pMsgConn, from_user_id);
 }

 if (pToImUser) {
     pToImUser->BroadcastClientMsgData(pPdu, msg_id, NULL, from_user_id);
 }
 
 IM::Server::IMGetDeviceTokenReq msg3;
 msg3.add_user_id(to_user_id);
 msg3.set_attach_data(pPdu->GetBodyData(), pPdu->GetBodyLength());
 CImPdu pdu2;
 pdu2.SetPBMsg(&msg3);
 pdu2.SetServiceId(SID_OTHER);
 pdu2.SetCommandId(CID_OTHER_GET_DEVICE_TOKEN_REQ);
 SendPdu(&pdu2);

    }

route_server 收到 msg_server的消息转发，信令为CID_MSG_DATA，调用CRouteConn::_BroadcastMsg 广播函数。

void CRouteConn::HandlePdu(CImPdu* pPdu)
{
	switch (pPdu->GetCommandId()) {
        // ...... 省略无关逻辑 
        
        case CID_MSG_DATA:
        case CID_SWITCH_P2P_CMD:
        case CID_MSG_READ_NOTIFY:
        case CID_OTHER_SERVER_KICK_USER:
        case CID_GROUP_CHANGE_MEMBER_NOTIFY:
        case CID_FILE_NOTIFY:
        case CID_BUDDY_LIST_REMOVE_SESSION_NOTIFY:
            _BroadcastMsg(pPdu, this);
            break;
            
        // ...... 省略无关逻辑 
        
	default:
		log("CRouteConn::HandlePdu, wrong cmd id: %d ", pPdu->GetCommandId());
		break;
	}
}

其实就是广播给所有的msg_server

void CRouteConn::_BroadcastMsg(CImPdu* pPdu, CRouteConn* pFromConn)
{
	ConnMap_t::iterator it;
	for (it = g_route_conn_map.begin(); it != g_route_conn_map.end(); it++) {
		CRouteConn* pRouteConn = (CRouteConn*)it->second;
		if (pRouteConn != pFromConn) {
			pRouteConn->SendPdu(pPdu);
		}
	}
}

所有的msg_server收到广播后再广播给所有的客户端

void CRouteServConn::_HandleMsgData(CImPdu* pPdu)
{
    IM::Message::IMMsgData msg;
    CHECK_PB_PARSE_MSG(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()));
    if (CHECK_MSG_TYPE_GROUP(msg.msg_type())) {
        s_group_chat->HandleGroupMessageBroadcast(pPdu);
        return;
    }
	uint32_t from_user_id = msg.from_user_id();
	uint32_t to_user_id = msg.to_session_id();
    uint32_t msg_id = msg.msg_id();
	log("HandleMsgData, %u->%u, msg_id=%u. ", from_user_id, to_user_id, msg_id);
        
    CImUser* pFromImUser = CImUserManager::GetInstance()->GetImUserById(from_user_id);
    if (pFromImUser)
    {
        pFromImUser->BroadcastClientMsgData(pPdu, msg_id, NULL, from_user_id);
    }
    
	CImUser* pToImUser = CImUserManager::GetInstance()->GetImUserById(to_user_id);
	if (pToImUser)
    {
		pToImUser->BroadcastClientMsgData(pPdu, msg_id, NULL, from_user_id);
	}
}

msg_server广播给所有的客户端有讲究，会将消息id等封装成 msg_ack_t 结构体塞入m_send_msg_list 发送列表，等到收到对端的CID_MSG_DATA_ACK，再将此msg_ack_t 结构体从发送列表中移除。其实就是业务层的ACK机制，避免丢消息。

typedef struct {
	uint32_t msg_id;
	uint32_t from_id;
	uint64_t timestamp;
} msg_ack_t; // 业务层的ack

void CImUser::BroadcastClientMsgData(CImPdu* pPdu, uint32_t msg_id, CMsgConn* pFromConn, uint32_t from_id)
{
    for (map<uint32_t, CMsgConn*>::iterator it = m_conn_map.begin(); it != m_conn_map.end(); it++)
    {
        CMsgConn* pConn = it->second;
        if (pConn != pFromConn) {
            pConn->SendPdu(pPdu);
            pConn->AddToSendList(msg_id, from_id);
        }
    }
}

void CMsgConn::AddToSendList(uint32_t msg_id, uint32_t from_id)
{
	//log("AddSendMsg, seq_no=%u, from_id=%u ", seq_no, from_id);
	msg_ack_t msg;
	msg.msg_id = msg_id;
	msg.from_id = from_id;
	msg.timestamp = get_tick_count();
	m_send_msg_list.push_back(msg);

	g_down_msg_total_cnt++;
}

收到确认 CID_MSG_DATA_ACK信令后，移除该确认结构体

void CMsgConn::_HandleClientMsgDataAck(CImPdu* pPdu)
{
    IM::Message::IMMsgDataAck msg;
    CHECK_PB_PARSE_MSG(msg.ParseFromArray(pPdu->GetBodyData(), pPdu->GetBodyLength()));
    
    IM::BaseDefine::SessionType session_type = msg.session_type();
    if (session_type == IM::BaseDefine::SESSION_TYPE_SINGLE)
    {
        uint32_t msg_id = msg.msg_id();
        uint32_t session_id = msg.session_id();
        DelFromSendList(msg_id, session_id);
    }
}

void CMsgConn::DelFromSendList(uint32_t msg_id, uint32_t from_id)
{
	//log("DelSendMsg, seq_no=%u, from_id=%u ", seq_no, from_id);
	for (list<msg_ack_t>::iterator it = m_send_msg_list.begin(); it != m_send_msg_list.end(); it++) {
		msg_ack_t msg = *it;
		if ( (msg.msg_id == msg_id) && (msg.from_id == from_id) ) {
			m_send_msg_list.erase(it);
			break;
		}
	}
}

至此，消息就算发送成功了。

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