Function clusterManagerCheckRedisReply

app/redis-6.2.6/src/redis-cli.c:2763–2777

Check whether reply is NULL or its type is REDIS_REPLY_ERROR. In the * latest case, if the 'err' arg is not NULL, it gets allocated with a copy * of reply error (it's up to the caller function to free it), elsewhere * the error is directly printed. */

 * of reply error (it's up to the caller function to free it), elsewhere
 * the error is directly printed. */
static int clusterManagerCheckRedisReply(clusterManagerNode *n,
                                         redisReply *r, char **err)
{
    int is_err = 0;
    if (!r || (is_err = (r->type == REDIS_REPLY_ERROR))) {
        if (is_err) {
            if (err != NULL) {
                *err = zmalloc((r->len + 1) * sizeof(char));
                strcpy(*err, r->str);
            } else CLUSTER_MANAGER_PRINT_REPLY_ERROR(n, r->str);
        }
        return 0;
    }
    return 1;
}

/* Call MULTI command on a cluster node. */
static int clusterManagerStartTransaction(clusterManagerNode *node) {