서버 모델 - 리눅스 소켓 프로그래밍(3)

• Server
  - 5_server
   : 클래스로 설계
  

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  #include <stdio.h> #include <string.h>   #include <unistd.h> #include <sys/types.h> #include <sys/socket.h>   #include <arpa/inet.h> #include <netinet/in.h>   #include "Packet.h"   int calculate(char op, int value1, int value2) {     switch (op) {         case '+': return value1 + value2;         case '-': return value1 - value2;         case '*': return value1 * value2;           default:             return -1;     } }   // TCP의 경계가 모호하거나, 데이터가 도달하지 않는 문제를 // 해결하기 위해서는 readn을 도입하면 된다. int readn(int sd, char* buf, int len) {     int n;     int ret;       n = len;     while (n > 0)     {         ret = read(sd, buf, len);         if (ret < 0) return -1;         if (ret == 0) return len - n;           buf += ret;         n -= ret;     }       return len; }       // 클래스를 설계할 때 지켜야하는 원칙 : SRP   // 객체 지향 5대 원칙 - 로버트 C 마틴(클린 코드) // SRP: 단일 책임 원칙 // OCP: 개방 폐쇄 원칙 // LSP: 리스코프 치환 원칙 // ISP: 인터페이스 분리 원칙 // DIP: 의존관계 역전 원칙     class NetAddress {     sockaddr_in addr; public:     NetAddress(const char* ip, short port)     {         memset(&addr, 0, sizeof addr);           addr.sin_family = AF_INET;         addr.sin_port = htons(port);         addr.sin_addr.s_addr = inet_addr(ip);     }       sockaddr* getRawAddress()     {         return (sockaddr*)&addr;     }   };   class Socket {     int sock; public:     Socket() { sock = socket(PF_INET, SOCK_STREAM, 0); }       explicit Socket(int sockFd) : sock(sockFd) {}       void bind(NetAddress* address)     {         // 다시 C 함수롤 호출해야 한다.            ::bind(sock, address->getRawAddress(), sizeof(sockaddr_in));     }         void setReuseAddress(bool b)     {         int option = b;         socklen_t optlen = sizeof(option);         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &option, optlen);     }       void listen(int backlog)     {         ::listen(sock, backlog);     }       Socket accept()     {         struct sockaddr_in caddr = {0, };         socklen_t clen = sizeof(caddr);         int csock = ::accept(sock, (struct sockaddr*)&caddr, &clen);           return Socket(csock);     }       inline int read(char* buf, size_t size)     { return ::read(sock, buf, size); }       inline int write(char* buf, size_t len)     { return ::write(sock, buf, len); }       inline int readn(char* buf, int len)     { return ::readn(sock, buf, len); }       inline int close()     { return ::close(sock); }   };     int main() {     // int sock = socket(PF_INET, SOCK_STREAM, 0);     Socket sock;       NetAddress address("0.0.0.0", 4000);     // struct sockaddr_in saddr = {0, };     // saddr.sin_family = AF_INET;     // saddr.sin_port = htons(4000);     // saddr.sin_addr.s_addr = INADDR_ANY; // 0.0.0.0       sock.setReuseAddress(true);     // int option = true;     // socklen_t optlen = sizeof(option);     // setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &option, optlen);       sock.bind(&address);     // bind(sock, (struct sockaddr*)&saddr, sizeof saddr);       sock.listen(5);     // listen(sock, 5);       while (1)     {           Socket csock = sock.accept();         // struct sockaddr_in caddr = {0, };         // socklen_t clen = sizeof(caddr);         // int csock = accept(sock, (struct sockaddr*)&caddr, &clen);           // char* cip = inet_ntoa(caddr.sin_addr);         // printf("Connected from %s\n", cip);           while (1)         {             int len;             int ret = csock.readn((char*)&len, sizeof(len));               printf("len : %d\n", len);             if (ret != sizeof len) {                 break;             } else if (ret == -1) {                 perror("readn()");                 break;             }               char buf[4096];             ret = csock.readn(buf, len);             if (ret != len) {                 break;             } else if (ret == -1) {                 perror("readn()");                 break;             }               // 이제 데이터를 파싱하면 됩니다.             Packet packet(buf);             char op = packet.getByte();             int value1 = packet.getInt32();             int value2 = packet.getInt32();               printf("%2d%2c%-2d\n", value1, op, value2);             int result = calculate(op, value1, value2);               csock.write((char*)&result, sizeof(result));         }           //-----------------         csock.close();     }       sock.close(); }

  
  - 6_server
   : SRP - Facade Pattern 적용
  

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  #include <stdio.h> #include <string.h>   #include <unistd.h> #include <sys/types.h> #include <sys/socket.h>   #include <arpa/inet.h> #include <netinet/in.h>   #include "Packet.h"   int calculate(char op, int value1, int value2) {     switch (op) {         case '+': return value1 + value2;         case '-': return value1 - value2;         case '*': return value1 * value2;           default:             return -1;     } }   // TCP의 경계가 모호하거나, 데이터가 도달하지 않는 문제를 // 해결하기 위해서는 readn을 도입하면 된다. int readn(int sd, char* buf, int len) {     int n;     int ret;       n = len;     while (n > 0)     {         ret = read(sd, buf, len);         if (ret < 0) return -1;         if (ret == 0) return len - n;           buf += ret;         n -= ret;     }       return len; }       // 클래스를 설계할 때 지켜야하는 원칙 : SRP   // 객체 지향 5대 원칙 - 로버트 C 마틴(클린 코드) // SRP: 단일 책임 원칙 // OCP: 개방 폐쇄 원칙 // LSP: 리스코프 치환 원칙 // ISP: 인터페이스 분리 원칙 // DIP: 의존관계 역전 원칙     class NetAddress {     sockaddr_in addr; public:     NetAddress(const char* ip, short port)     {         memset(&addr, 0, sizeof addr);           addr.sin_family = AF_INET;         addr.sin_port = htons(port);         addr.sin_addr.s_addr = inet_addr(ip);     }       sockaddr* getRawAddress()     {         return (sockaddr*)&addr;     }   };   class Socket {     int sock; public:     Socket() { sock = socket(PF_INET, SOCK_STREAM, 0); }       explicit Socket(int sockFd) : sock(sockFd) {} // explicit로 지정함으로써 암시적 형변환을 막는다.       void bind(NetAddress* address)     {         // 다시 C 함수롤 호출해야 한다.            ::bind(sock, address->getRawAddress(), sizeof(sockaddr_in));     }         void setReuseAddress(bool b)     {         int option = b;         socklen_t optlen = sizeof(option);         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &option, optlen);     }       void listen(int backlog)     {         ::listen(sock, backlog);     }       Socket accept()     {         struct sockaddr_in caddr = {0, };         socklen_t clen = sizeof(caddr);         int csock = ::accept(sock, (struct sockaddr*)&caddr, &clen);           return Socket(csock);     }       inline int read(char* buf, size_t size)     { return ::read(sock, buf, size); }       inline int write(char* buf, size_t len)     { return ::write(sock, buf, len); }       inline int readn(char* buf, int len)     { return ::readn(sock, buf, len); }       inline int close()     { return ::close(sock); }   };   // TCP 서버 프로그래밍을 하는데 있어서 필요한 클래스와 절차를 // 단순화 시켜주는 상위 개념의 클래스를 제공하자. // -> Facade Pattern   class TCPServer {     Socket sock; public:     void start(short port)     {         NetAddress address("0.0.0.0", port);         sock.setReuseAddress(true);         sock.bind(&address);         sock.listen(5);           while (1)         {               Socket csock = sock.accept();               while (1)             {                 int len;                 int ret = csock.readn((char*)&len, sizeof(len));                   printf("len : %d\n", len);                 if (ret != sizeof len) {                     break;                 } else if (ret == -1) {                     perror("readn()");                     break;                 }                   char buf[4096];                 ret = csock.readn(buf, len);                 if (ret != len) {                     break;                 } else if (ret == -1) {                     perror("readn()");                     break;                 }                   // 이제 데이터를 파싱하면 됩니다.                 Packet packet(buf);                 char op = packet.getByte();                 int value1 = packet.getInt32();                 int value2 = packet.getInt32();                   printf("%2d%2c%-2d\n", value1, op, value2);                 int result = calculate(op, value1, value2);                   csock.write((char*)&result, sizeof(result));             }               //-----------------             csock.close();         }           sock.close();         }   };     int main() {     TCPServer server;     server.start(4000); }