hiredis基于libev异步实现subscribe/publish功能

关于hiredis的libev异步实现参考 https://blog.csdn.net/fangfanglovezhou/article/details/104984849

subscribe/publish功能介绍参考 https://blog.csdn.net/fangfanglovezhou/article/details/105248751

直接上代码，客户端1实现subscribe功能：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <hiredis/hiredis.h>
#include <hiredis/async.h>
#include <hiredis/adapters/libev.h>
void getCallback(redisAsyncContext *c, void *r, void *privdata) {
    redisReply *reply = r;
    if (reply == NULL) return;
    printf("%s\n",(char*)privdata);
     if ( reply->type == REDIS_REPLY_ARRAY && reply->elements == 3 ) {
            if ( strcmp( reply->element[0]->str, "subscribe" ) != 0 ) {
                printf( "Received[%s] channel %s: %s\n",
                        (char*)privdata,
                        reply->element[1]->str,
                        reply->element[2]->str );
            }
        }
}
void connectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s\n", c->errstr);
        return;
    }
    printf("Connected...\n");
}
void disconnectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s\n", c->errstr);
        return;
    }
    printf("Disconnected...\n");
}

int main (int argc, char **argv) {
    signal(SIGPIPE, SIG_IGN);

    redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
    if (c->err) {
        /* Let *c leak for now... */
        printf("Error: %s\n", c->errstr);
        return 1;
    }
    redisLibevAttach(EV_DEFAULT_ c);
    redisAsyncSetConnectCallback(c,connectCallback);
    redisAsyncSetDisconnectCallback(c,disconnectCallback);
    redisAsyncCommand(c, NULL, NULL, "auth 123");
    redisAsyncCommand(c,getCallback, (char*)"send message","subscribe test1");
    ev_loop(EV_DEFAULT_ 0);
    return 0;
}

客户端2代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

#include <hiredis/hiredis.h>
#include <hiredis/async.h>
#include <hiredis/adapters/libev.h>

void getCallback(redisAsyncContext *c, void *r, void *privdata) {
    redisReply *reply = r;
    if (reply == NULL) return;
    printf("argv[%s]: %s\n", (char*)privdata, reply->str);
}

void connectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s\n", c->errstr);
        return;
    }
    printf("Connected...\n");
}

void disconnectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s\n", c->errstr);
        return;
    }
    printf("Disconnected...\n");
}

int main (int argc, char **argv) {
    signal(SIGPIPE, SIG_IGN);

    redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
    if (c->err) {
        /* Let *c leak for now... */
        printf("Error: %s\n", c->errstr);
        return 1;
    }

    redisLibevAttach(EV_DEFAULT_ c);
    redisAsyncSetConnectCallback(c,connectCallback);
    redisAsyncSetDisconnectCallback(c,disconnectCallback);
    redisAsyncCommand(c, NULL, NULL, "AUTH 123");
    redisAsyncCommand(c, getCallback, (char*)"send message", "publish test1 123");
    ev_loop(EV_DEFAULT_ 0);
    return 0;
}

首先，启动客户端1，客户端1会打印消息：

可以看到，在连接服务器后，会收到服务器的回复，调用回调函数getCallback,但没有发布消息，因此指挥打印发送过去的消息。

随后，从新打开一个窗口，启动客户端2，客户端1会打印消息：

可以看到，此时客户端2向频道test1发布消息，服务器收到后，会向监控通道test1的所有客户端发送消息，随后客户端1收到服务端发到通道test1消息。