myicq1.0a1服务器代码分析(三)服务器集群

myicq1.0a1服务器代码分析(三)服务器集群

顾剑辉(Solarsoft)

服务器集群其实是服务器之间建立联系,并维护这样的联系,如:玩联众时,你会看到很多服务器,那它们是怎样共同工作的呢!分析如下:

服务器与服务器之间一般用TCP进行连接,并在每个服务器中都建立这个表,表中包括相应的信息,如服务器IP,port,包括游戏的每个服务器在线人员人数,等等.当你进入别的游戏主机时,其实是一个退出当前服务器,登入其他服务器的过程,相应的在线数据,服务器之间会传送好的.

接下去,我们一起来看一下,myicq是怎样做到集群的.

class ServerHash {

public:

       void put(Server *s) {

              int i = hashfn(s->ip);

              hash[i].addHead(&s->hashItem);

       }

       Server *get(uint32 ip);

 

private:

       int hashfn(uint32 ip) {

              return (ip & (SERVER_HASH_SIZE - 1));

       }

 

       ListHead hash[SERVER_HASH_SIZE];

};

 

Server *ServerHash::get(uint32 ip)

{

       int i = hashfn(ip);

       ListHead *head = &hash[i];

       ListHead *pos;

 

       LIST_FOR_EACH(pos, head) {

              Server *s = LIST_ENTRY(pos, Server, hashItem);

              if (s->ip == ip)

                     return s;

       }

       return NULL;

}

ListHead Server::serverList;

static ServerHash serverHash;

这里其实是服务器在线列表的hash表管理,这个hash管理不清楚的,你可以看一下我的文章(一).

再来看一下,用于服务器连接的socket类,其中RefObject是起个计数器的作用.

class Server : public RefObject {

public:

       Server();

       virtual ~Server();

 

       void onDnsResolved(uint32 ip);

       void onConnect();

       void onReceive();

       void onClose();

 

       bool connect(uint32 ip, uint16 port);

       RemoteSession *getSession(uint32 uin);

 

       void sendUserOnline(Session *s);

       void sendUserOffline(uint32 uin);

       void sendUserStatus(uint32 uin, uint32 status);

       void sendMessage(uint8 type, uint32 dst, uint32 src, ICQ_STR &text);

       void addFriend(uint16 seq, uint32 dst, uint32 src);

       void delFriend(uint32 dst, uint32 src);

       void updateContact(uint16 seq, uint32 dst, uint32 src);

       void searchRandom(uint16 seq, uint32 src);

       void searchUIN(uint16 seq, uint32 dst, uint32 src);

 

       void addFriendReply(uint16 seq, uint32 dst, uint32 src, uint8 auth);

       void updateContactReply(uint16 seq, uint32 src, uint8 *data, int n);

       void searchUINReply(uint16 seq, uint32 src, uint8 *data, int n);

 

       static bool init();

       static void destroy();

       static Server *getServer(const char *name);

       static Server *createServer(const char *name);

       static RemoteSession *getSession(QID &qid);

       static int generateFds(fd_set &readfds, fd_set &writefds);

       static void examineFds(fd_set &readfds, fd_set &writefds);

 

       static ListHead serverList;

 

       char domainName[MAX_DOMAIN_NAME + 1];

       char descName[MAX_DESC_NAME + 1];

       ICQ_STR domain;

       ICQ_STR desc;

 

       uint32 ip;

       int sock;

       int status;

       time_t expire;

       uint32 sessionCount;

       bool isAccepted;

 

       ListHead listItem;

       ListHead hashItem;

 

private:

       bool setDomainAndDesc(ICQ_STR &name, ICQ_STR &des);

 

       RemoteSession *createSession(uint32 uin);

       void notify(uint32 uin, DB_CALLBACK cb);

 

       void createPacket(TcpOutPacket &out, uint16 cmd);

       TcpOutPacket *createPacket(uint16 cmd);

       void sendPacket(TcpOutPacket *out);

       void sendPendingPacket(int s);

 

       void onPacketReceived(TcpInPacket &in);

       void onHello(TcpInPacket &in);

       void onSendMessage(TcpInPacket &in);

       void onAddFriend(TcpInPacket &in);

       void onDelFriend(TcpInPacket &in);

       void onUserOnline(TcpInPacket &in);

       void onUserOffline(TcpInPacket &in);

       void onUserStatus(TcpInPacket &in);

       void onUpdateContact(TcpInPacket &in);

       void onSearchRandom(TcpInPacket &in);

       void onSearchUIN(TcpInPacket&in);

 

       void onHelloReply(TcpInPacket &in);

       void onAddFriendReply(TcpInPacket &in);

       void onUpdateContactReply(TcpInPacket &in);

       void onSearchRandomReply(TcpInPacket &in);

       void onSearchUINReply(TcpInPacket &in);

 

       char buf[TCP_PACKET_SIZE];

       int bufSize;

 

       ListHead uinHash[UIN_HASH_SIZE];

       ListHead sessionList;

       ListHead sendQueue;

 

       DECLARE_SLAB(Server)

};

上面的程序,我不做太多解释,我想大家也应该看得懂,如有疑问可以发表看法,来讨论一下.

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