如何与HiRedis异步发布

时间:2015-08-31 01:49:23

标签: c++ redis hiredis

我正在使用HiRedis和c / c ++程序,并编写了一些测试来验证订阅是否有效(我的解决方案基于this comment)。

但是,目前我只能通过在publish foo "abcd"终端中手动输入redis-cli这样的内容来发布。这根据链接的评论工作,但我想从我的c ++程序发布。我怎么能这样做?

我试过这个命令:

redisAsyncCommand(c, SubCallback, (char*)"command", "publish foo \"abcd\"");

但是这导致了这个运行时错误:

  

错误:仅ERR(P)SUBSCRIBE /(P)在此上下文中允许使用UNSUBSCRIBE / QUIT

如何从HiRedis中发布数据?

2 个答案:

答案 0 :(得分:0)

来自https://github.com/redis/hiredis中的hiredis/examples/example-libevent.c

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

#include <hiredis.h>
#include <async.h>
#include <adapters/libevent.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);

    /* Disconnect after receiving the reply to GET */
    redisAsyncDisconnect(c);
}

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);
    struct event_base *base = event_base_new();

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

    redisLibeventAttach(c,base);
    redisAsyncSetConnectCallback(c,connectCallback);
    redisAsyncSetDisconnectCallback(c,disconnectCallback);
    redisAsyncCommand(c, NULL, NULL, "SET key %b", argv[argc-1], strlen(argv[argc-1]));
    redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key");
    event_base_dispatch(base);
    return 0;
}

答案 1 :(得分:0)

连接上下文订阅后,不能用于PUBLISH。您必须创建一个新连接。