如何利用Redis和C++开发发布-订阅功能

#include <iostream>
#include <string>
#include <thread>
#include <hiredis/hiredis.h>

void subscribeThread()
{
    // 创建Redis上下文
    redisContext* context = redisConnect("127.0.0.1", 6379);
    if (context == NULL || context->err)
    {
        if (context)
        {
            std::cout << "Error: " << context->errstr << std::endl;
            redisFree(context);
        }
        else
        {
            std::cout << "Error: 连接Redis服务器失败！" << std::endl;
        }
        return;
    }

    // 订阅频道
    redisReply* reply = static_cast<redisReply*>(
        redisCommand(context, "SUBSCRIBE mychannel"));

    if (reply == NULL || reply->type == REDIS_REPLY_ERROR)
    {
        std::cout << "Error: 订阅频道失败！" << std::endl;
        freeReplyObject(reply);
        redisFree(context);
        return;
    }

    // 循环接收消息
    while (true)
    {
        redisReply* r = nullptr;
        int status = redisGetReply(context, (void**)&r);

        if (status == REDIS_ERR)
        {
            std::cout << "Error: 接收消息失败！" << std::endl;
            break;
        }

        if (r->type == REDIS_REPLY_ARRAY && r->elements == 3)
        {
            if (strcmp(r->element[0]->str, "message") == 0)
            {
                std::cout << "接收到消息: " << r->element[2]->str << std::endl;
            }
        }

        freeReplyObject(r);
    }

    // 释放资源
    freeReplyObject(reply);
    redisFree(context);
}

void publishThread()
{
    redisContext* context = redisConnect("127.0.0.1", 6379);
    if (context == NULL || context->err)
    {
        if (context)
        {
            std::cout << "Error: " << context->errstr << std::endl;
            redisFree(context);
        }
        else
        {
            std::cout << "Error: 连接Redis服务器失败！" << std::endl;
        }
        return;
    }

    // 发布消息
    while (true)
    {
        std::string message;
        std::cout << "请输入要发布的消息（输入q退出）：";
        std::getline(std::cin, message);

        if (message == "q")
        {
            break;
        }

        redisReply* reply = static_cast<redisReply*>(
            redisCommand(context, "PUBLISH mychannel %s", message.c_str()));

        if (reply == NULL || reply->type == REDIS_REPLY_ERROR)
        {
            std::cout << "Error: 发布消息失败！" << std::endl;
        }

        freeReplyObject(reply);
    }

    // 释放资源
    redisFree(context);
}

int main()
{
    std::thread subThread(subscribeThread);
    std::thread pubThread(publishThread);

    subThread.join();
    pubThread.join();

    return 0;
}