hredis 设置超时返回

sdsabc2000

于 2019-01-05 10:00:16 发布

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分类专栏： c/c++ redis

本文链接：https://blog.youkuaiyun.com/sdsabc2000/article/details/85836023

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本文深入探讨了hredis库中设置操作超时时间的方法及其实际应用效果。通过具体示例，验证了当操作未超出设定时间时，命令能够成功执行并返回预期结果；而当操作超时时，将不再返回回复，并抛出资源暂时不可用的错误。

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hredis可以设置操作超时时间（在调用操作命令前调用redisSetTimeout），操作超时即返回；
    redisContext *c;
    redisReply *reply;
    ssize_t s;
    const char *cmd = "DEBUG SLEEP 3\r\n";
    struct timeval tv;

    c = connect(config);
    test("Successfully completes a command when the timeout is not exceeded: ");
    reply = redisCommand(c,"SET foo fast");
    freeReplyObject(reply);
    tv.tv_sec = 0;
    tv.tv_usec = 10000;
    redisSetTimeout(c, tv);
    reply = redisCommand(c, "GET foo");
    test_cond(reply != NULL && reply->type == REDIS_REPLY_STRING && memcmp(reply->str, "fast", 4) == 0);
    freeReplyObject(reply);
    disconnect(c, 0);

    c = connect(config);
    test("Does not return a reply when the command times out: ");
    s = write(c->fd, cmd, strlen(cmd));
    tv.tv_sec = 0;
    tv.tv_usec = 10000;
    redisSetTimeout(c, tv);
    reply = redisCommand(c, "GET foo");
    test_cond(s > 0 && reply == NULL && c->err == REDIS_ERR_IO && strcmp(c->errstr, "Resource temporarily unavailable") == 0);
    freeReplyObject(reply);

详细可参看hredis的例子http://download.redis.io/redis-stable/deps/hiredis/test.c