Redis源码-3 网络编程

Redis 网络编程

开发一个server和client, client向server发送消息， server输出client内容

源代码

源码

准备工作：从redis源码中拷贝代码

cp /home/vagrant/github/server_installer/servers/redis/redis-6.2/src/zmalloc.* .
cp /home/vagrant/github/server_installer/servers/redis/redis-6.2/src/anet.* .
cp /home/vagrant/github/server_installer/servers/redis/redis-6.2/src/atomicvar.h .
cp /home/vagrant/github/server_installer/servers/redis/redis-6.2/src/fmacros.h .

新建server.c

#include "stdio.h"
#include "anet.h"
#include "zmalloc.h"
#include 
#include 
#include "sys/socket.h"
#define NET_IP_STR_LEN 46 /* INET6_ADDRSTRLEN is 46, but we need to be sure */

int main() {
    // 错误信息
    char *neterr = zmalloc(10);

    printf("staring...\n");

    // 端口6380
    int serverSocket = anetTcpServer(neterr, 6380,"*" , 2);
    if ( ! neterr ) {
        printf("start err %s \n", neterr);
        return 1;
    }
    printf("listening...%d \n",serverSocket );

    while(1){
        int cfd;
        // 错误信息
        char* err = zmalloc(20);
        char cip[NET_IP_STR_LEN];
        int cport;
        cfd = anetTcpAccept(err, serverSocket, cip, sizeof(cip), &cport);
        if ( cfd == ANET_ERR )
            continue;
        printf("accept...%d\n",cfd);
        char buf[1024];
        recv(cfd, buf, sizeof(buf), MSG_WAITALL);
        printf("recv from %s:%d  %s\n",cip, cport, buf);
        close(cfd);
    }
    close(serverSocket);
}

新建client.c

#include "stdio.h"
#include "anet.h"
#include "zmalloc.h"
#include 
#include 
#include "sys/socket.h"
#define NET_IP_STR_LEN 46 /* INET6_ADDRSTRLEN is 46, but we need to be sure */


int main() {
    // 错误信息
    char *neterr = zmalloc(10);
    printf("staring...\n");
    int port;
    port = 6380;
    char* addr;
    addr = "127.0.0.1";
    int fd = anetTcpNonBlockConnect(NULL,addr,port);
    char * hello = "hello";
    printf("send %s\n", hello);
    send(fd, hello, sizeof(hello),MSG_DONTWAIT );
    close(fd);
}

新建Makefile文件

all: server client
    @echo "anet demo"

server : anet.o zmalloc.o server.o
    $(CC)   -o $@   $^

client : anet.o zmalloc.o client.o
    $(CC)   -o $@   $^

%.o: %.c 
    $(CC) -O0 -DREDIS_TEST=1 -MMD -o $@ -c $<


.PHONY: clean
clean:
    rm -rf *.o *.d server client

解释

anet把封装的了socket编程的接口, 原先需要socket, bind, listen, accept , connect等接口封装为很少的接口，屏蔽了一些复杂的参数，开发网络编程更加接近Go、Python等高级语言。

输出

执行make后会生成client和server, 先启动server，再执行client。

server端输出

staring...
listening...3 
accept...4
recv from 127.0.0.1:60322  hello

client端输出

staring...
send hello

使用到的api

• int anetTcpServer(char err, int port, char bindaddr, int backlog); -- 创建tcp服务
• int anetTcpAccept(char err, int serversock, char ip, size_t ip_len, int *port); --监听anetTcpServer的网络请求
• int anetTcpNonBlockConnect(char err, const char addr, int port); -- 连接tcp服务

文章思路

• 动手实践是最快的学习方式。用能理解的方式，轻松的学习Redis，借鉴Redis， 并应用。
• 不过分关注细节，从Api入手

码字不易，感谢点赞