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基于Tars高并发IM系统的设计与实现-实战篇5

群聊服务 GroupChatServer

群聊服务既可以接受来自BrokerServer的用户请求，也需要接收来自其他服务的RPC请求;所以本服务提供两套RPC接口：通用RPC接口和专用RPC接口。

通用RPC接口

通用RPC接口主要处理如下请求：

• 创建群聊
• 群聊加成员
• 群聊减成员
• 修改群资料
• 发群消息
• 换群主
• 解散群聊
• 同步用户群聊
• 获取群成员
• 解散群聊
• 判断一个人是否为群成员

针对以上每个业务，根据用户请求的类型进行不同的业务逻辑处理，处理代码如下：

  switch(req.header.type){case otim::PT_MSG_GROUP_CHAT:this->sendMsg(clientContext, req, resp);break;case otim::PT_GROUPCHAT_SYNC:this->syncGroup(clientContext, req, resp);break;case otim::PT_GROUPCHAT_CREATE:this->createGroup(clientContext, req, resp);break;case otim::PT_GROUPCHAT_JION:this->joinGroup(clientContext, req, resp);break;case otim::PT_GROUPCHAT_QUIT:this->quitGroup(clientContext, req, resp);break;case otim::PT_GROUPCHAT_DISMISS:this->dismissGroup(clientContext, req, resp);break;case otim::PT_GROUPCHAT_UPDATE_CREATOR:this->updateGroupCreator(clientContext, req, resp);break;case otim::PT_GROUPCHAT_INFO_UPDATE:this->updateGroupInfo(clientContext, req, resp);break;case otim::PT_GROUPCHAT_MEMBERS_GET:this->getGroupMember(clientContext, req, resp);break;default:MLOG_DEBUG("the type is  invalid:"<<otim::etos((otim::PACK_TYPE)req.header.type));return otim::EC_PROTOCOL;}

群聊相关请求实现方法：

   int syncGroup(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int createGroup(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int dismissGroup(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int updateGroupCreator(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int updateGroupInfo(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int joinGroup(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int quitGroup(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);int getGroupMember(const otim::ClientContext & clientContext, const otim::OTIMPack & req,  otim::OTIMPack & resp);

专用RPC接口

主要提供两个接口：

interface GroupChatRPCServant
{int getGroupMember(string groupId, out vector<string> memberIds);bool isGroupMember(string groupId, string memberId);};

历史消息服务 HistoryMsgServer

该服务主要处理用户历史消息即相关的业务：

• 热会话同步
• 历史消息存取
• 高优先级消息存取

该服务提供通用RPC服务，主要服务对象为接入服务BrokerServer；
用户所有消息都通过该服务进行存取；为高效存取，历史消息主要存储在redis,存储量及时长可以根据需求进一步来做配置开发。

业务逻辑处理接口

该服务采用通用接口来处理客户端请求；

   tars::Int32 processHotsessionReq(const otim::ClientContext & clientContext,const otim::OTIMPack & req,otim::OTIMPack &resp);tars::Int32 processPullHistoryReq(const otim::ClientContext & clientContext,const otim::OTIMPack & reqPack,otim::OTIMPack &respPack);tars::Int32 processHighPriorMsgSyncReq(const otim::ClientContext & clientContext,const otim::OTIMPack & reqPack,otim::OTIMPack &respPack);

冷存储服务器 OlapServer

该服务主要将IM数据存储到mysql中永久保存；专用RPC服务；

业务逻辑处理接口

interface OlapServant
{int saveMsg(otim::ClientContext clientContext, OTIMPack pack, string sessionId, long seqId);
};

消息操作服务 MsgOperatorServer

该服务主要有如下功能逻辑处理：

• 消息控制请求（包含撤回，删除，覆写）
• 消息已读处理

业务逻辑处理接口

    tars::Int32 processMsgUnreadReq(const otim::ClientContext & clientContext,const otim::OTIMPack & reqPack,otim::OTIMPack &respPack);tars::Int32 processMsgCTRLReq(const otim::ClientContext & clientContext,const otim::OTIMPack & reqPack,otim::OTIMPack &respPack);

消息撤回，删除，覆写逻辑处理

tars::Int32 MsgOperatorServantImp::processMsgCTRLReq(const otim::ClientContext & clientContext,const otim::OTIMPack & reqPack,otim::OTIMPack &respPack)
{SCOPELOGGER(scopelogger);scopelogger<<"reqPack:"<<reqPack.header.writeToJsonString();otim::MsgControl req;otim::unpackTars<otim::MsgControl>(reqPack.payload, req);MLOG_DEBUG("clientContext:"<<clientContext.writeToJsonString()<<" req:"<<req.writeToJsonString());respPack = reqPack;respPack.header.flags |= otim::PF_ISACK;otim::CommonErrorCode respData;respData.code = otim::EC_SUCCESS;if (req.sessionId.empty() || req.seqId == 0 || req.packId.empty()){respData.code = otim::EC_PARAM;otim::packTars<otim::CommonErrorCode>(respData, respPack.payload);MLOG_DEBUG("sessionId,packId or seqId is is empty req:"<<req.writeToJsonString());return  respData.code;}otim::RedisConnPtr redis(otim::RedisPool::instance());//get old msgstd::vector<std::string> msgs;std::vector<std::string> scores;EMRStatus ret = redis->ZRangeByScoreAndLimit(otim::RKEY_MSG + req.sessionId, req.seqId, 5, msgs);if (EMRStatus::EM_KVDB_ERROR == ret){MLOG_ERROR("get msg fail!, sessionId:" << req.sessionId<<" msgId:"<<req.seqId);respData.code = otim::EC_DB_ERROR;otim::packTars<otim::CommonErrorCode>(respData, respPack.payload);return otim::EC_DB_ERROR;}MLOG_DEBUG("get old msg size:"<<msgs.size());otim::OTIMPack packOrg;for (auto item : msgs){std::vector<char> vctItem(item.begin(), item.end());otim::OTIMPack packItem;otim::unpackTars<otim::OTIMPack>(vctItem, packItem);MLOG_DEBUG("msgs :"<<packItem.header.writeToJsonString());if (packItem.header.packId == req.packId){packOrg = packItem;}}if (packOrg.header.packId.empty()){MLOG_WARN("The org msg is not exist:"<<req.sessionId<<" packId:"<<req.packId <<" seqId:"<<req.seqId);respData.code = otim::EC_MSG_NOT_EXIST;otim::packTars<otim::CommonErrorCode>(respData, respPack.payload);return respData.code;}MLOG_DEBUG("org msg:"<<packOrg.header.writeToJsonString());std::string to;if (req.command == otim::MC_REVOKE){packOrg.header.flags |= otim::PF_REVOKE;MLOG_DEBUG("revoke msg:"<<req.packId);}else if (req.command == otim::MC_OVERRIDE){packOrg.header.flags |= otim::PF_OVERRIDE;otim::MsgReq msgReq;otim::unpackTars<otim::MsgReq>(packOrg.payload, msgReq);msgReq.content = req.content;otim::packTars<otim::MsgReq>(msgReq, packOrg.payload);to = msgReq.to;MLOG_DEBUG("override msg:"<<req.packId);}else if (req.command == otim::MC_DELETE){
//        packOrg.header.flags |= otim::PF_REVOKE;MLOG_DEBUG("delete msg:"<<req.packId);}else{MLOG_WARN("The command is error:"<<req.command<<" packId:"<<req.packId);respData.code = otim::EC_MSG_OP_CMD;otim::packTars<otim::CommonErrorCode>(respData, respPack.payload);return otim::EC_MSG_OP_CMD;}ret = redis->ZSetRemoveByScore(otim::RKEY_MSG + req.sessionId, req.seqId, req.seqId);if (EMRStatus::EM_KVDB_SUCCESS != ret ){MLOG_ERROR("delete original msg fail:"<<(int)ret);}//增加新的消息if (req.command != otim::MC_DELETE){std::string msgSave;otim::packTars<otim::OTIMPack>(packOrg, msgSave);ret = redis->ZSetAdd(otim::RKEY_MSG + req.sessionId, req.seqId, msgSave);if ( EMRStatus::EM_KVDB_SUCCESS != ret ){MLOG_ERROR("save cancel msg fail!");}}//通知在线接收者其他端otim::sendPackToMySelf(clientContext, reqPack);//  send to userstd::vector<std::string> vctUserId;if (packOrg.header.type == otim::PT_MSG_SINGLE_CHAT || packOrg.header.type == otim::PT_MSG_BIZ_NOTIFY){if (to.empty()){otim::MsgReq msgReq;otim::unpackTars<otim::MsgReq>(packOrg.payload, msgReq);to = msgReq.to;}vctUserId.push_back(to);MLOG_DEBUG("single or notify chat  packId:"<<packOrg.header.packId<<" to:"<<to);}else if (packOrg.header.type == otim::PT_MSG_GROUP_CHAT){//get groupMemberotim::GroupChatRPCServantPrx groupChatRPCServantPrx = otim::getServantPrx<otim::GroupChatRPCServantPrx>(PRXSTR_GROUP_CHAT_RPC);groupChatRPCServantPrx->getGroupMember(req.sessionId, vctUserId);MLOG_DEBUG("group chat  packId:"<<packOrg.header.packId<<" to:"<<req.sessionId<<" member Size:"<<vctUserId.size());}int64_t seqId = otim::genSeqId();for (auto userId : vctUserId){otim::savePriorityMsg(redis.get(), reqPack, userId, seqId);otim::dispatchMsg(clientContext, reqPack, userId);}respData.code = otim::EC_SUCCESS;otim::packTars<otim::CommonErrorCode>(respData, respPack.payload);return otim::EC_SUCCESS;
}

Http接口服务

该服务针对第三方提供消息能力，主要提供如下接口：

• 发送消息(简单文本消息，复杂消息）
• 添加好友
• 删除好友
• 查看好友

功能实现函数

    std::string  doSendSimpleMsgCmd(TC_HttpRequest &cRequest);std::string  doSendMsgCmd(TC_HttpRequest & cRequest);std::string  doAddFriend(TC_HttpRequest &request);std::string  doDelFriend(TC_HttpRequest &request);std::string  doGetFriends(TC_HttpRequest &request);

Push推送服务

该服务主要实现IM消息的离线推送能力， APP客户端不在线的场景下，将消息通过离线通道push用户的手机上，以提高消息的触达率。

主要实现iOS APNS，Android FCM，华为，小米，oppo，vivo等厂商的离线消息推送功能；
需要根据各个厂商开放平台提供的API进行开发集成。

Android 厂商开发平台地址：

• 华为:
  https://developer.huawei.com/consumer/cn/hms/huawei-pushkit
• 小米:
  https://dev.mi.com/console/appservice/push.html
• 魅族:
  http://open-wiki.flyme.cn/doc-wiki/index
• vivo:
  https://push.vivo.com.cn/#/
• oppo:
  https://push.oppo.com/

RPC接口

enum PushServiceType
{PS_TYPE_NONE = 0, //无 Push服务提供商PS_TYPE_IOS = 1,  //IOS Push服务提供商PS_YPE_HUAWEI = 2,   //华为 Push服务提供商PS_TYPE_XIAOMI = 3,   //小米 Push服务提供商PS_TYPE_MEIZU = 4,   //魅族 Push服务提供商PS_TYPE_VIVO = 5,  //vivi服务PS_TYPE_OPPO = 6, //oppo服务PS_TYPE_FCM = 7, //FCM服务
};struct RegInfo {0  require string packId = "";                           //消息的id1  require PushServiceType serviceType = 0;              //push服务提供商2  require string packageName = "";                          //包名3  require string userId = "";                            //用户id4  optional string appVersion = "";                       //app version
};struct PushInfo {0  require string packId = "";                           //消息的id1  require string userId = "";                            //用户id2  require int unReadCount = 0;                          //未读消息数3  require string title = "";                            /push标题4  require string content = "";                          //push内容5  optional string uri = "";                              //跳转uri6  optional string extraData="";                           //业务自定义字段
};interface PushServant
{int register(RegInfo regInfo);int pushMessage(PushInfo pushInfo);
};

服务端部署

编译打包

所有服务开发完成后，执行如下命令进行编译，打包：

make release
make clean all
make tar

程序包部署

根据前期部署好的Tars框架环境、web管理系统，将程序包逐个发布，发布后的系统如图：