Glog改进2- 修改glog保存近几天日志

glog本身不带保存多少天日志的功能，会一直存储直到硬盘存满，实际项目当中都是保存近期内的日志就可以了，所以需要对glog进行改进，改进的方法也很简单，当天的日志以yyyymmdd 建立文件夹即可，然后对文件夹进行时间排序，删除就文件夹即可，代码如下。

bool checkDay()
{
    time_t raw_time;
    struct tm* tm_info;

    time(&raw_time);
    tm_info = localtime(&raw_time);

    //printf("time_now:%d%d%d%d%d%d.%ld(us)\n", 1900+tm_info->tm_year, 1+tm_info->tm_mon, tm_info->tm_mday, tm_info->tm_hour, tm_info->tm_min, tm_info->tm_sec);
    char day[128] = {0};
    sprintf(day, "%s%04d%02d%02d", LOGPATH, 1900+tm_info->tm_year, 1+tm_info->tm_mon, tm_info->tm_mday);

    if(access(day, F_OK|W_OK) != 0){
        if(mkdir(day, S_IROTH | S_IWOTH | S_IXOTH) != 0){
            printf("error\n");
            return false;
        }
    }

    char path[128] = {0};
    sprintf(path, "%s/jsmetro_", day);
    google::SetLogDestination(google::GLOG_INFO, path);
    return true;
}

int readFilesInDir(const char *basePath)
{
    DIR *dir;
    struct dirent *ptr;

    if ((dir=opendir(basePath)) == NULL){
        perror("Open dir error...");
        return -1;
    }

    while ((ptr=readdir(dir)) != NULL)
    {
        if(strcmp(ptr->d_name,".")==0 || strcmp(ptr->d_name,"..")==0)    ///current dir OR parrent dir
            continue;
        else{

            printf("rm file:%s\n", ptr->d_name);
            char file[128] = {0};
            sprintf(file, "%s/%s", basePath, ptr->d_name);
            int ret = unlink(file);
            if(ret != 0){
                printf("unlink %s failed!\n", file);
                closedir(dir);
                return -1;
            }
        }
    }
    closedir(dir);
    return 0;
}

int rmdir2(const char *path)
{
    int ret = readFilesInDir(path);
    if(ret != 0)
        return -1;

    ret = rmdir(path);
    if(ret != 0){
        printf("rm %s failed!\n", path);
        return -1;
    }

    return 0;
}

bool rmOldDay()
{
    struct dirent **namelist;
    int n = 0, i = 0;

    n = scandir(LOGPATH, &namelist, 0, alphasort);

    if(n > 0){
        if(n > 2){ //除去 . and ..
            if((n - 2)  > MAX_SAVE_DAYS){
                char first[128] = {0};
                memcpy(first, namelist[2]->d_name, sizeof(first));
                sprintf(first, "%s%s", LOGPATH, namelist[2]->d_name);
                printf("rm old:%s\n", first);
                int ret = rmdir2(first);
                if(ret != 0){
                    printf("rm %s failed!\n", first);
                }
            }
        }

        for (i = 0; i < n; i++)
        {
//            printf("%s\n", namelist[i]->d_name);
            free(namelist[i]);
        }
        free(namelist);
    }

    return true;
}