FastDFS plus Redis implement custom file names to store massive files

FastDFS is very suitable for storing a large number of small files. Unfortunately, it does not support custom file names. The file name is a file_id generated based on the storage location after successful storage. Many application scenarios have to use custom file names. Without modifying the source code, you can add a database to the storage client fdfs_client to store the mapping relationship between the custom file name and the file_id of fastdfs to indirectly implement the custom file. For name access and access, here we choose reids. By the way, Taobao also has a file storage system TFS similar to FastDFS. For custom file names, it uses mysql to store mapping relationships. I think mysql itself is a bottleneck under high concurrent access, so it is used in this solution. redis.

Preparation work:

fastdfs environment installation... slightly... (official: https://code.google.com/p/fastdfs/)

redis environment installation... slightly... (official: http://redis.io/)

is implemented in python, so you need to install the python client of fastdfs (download: https://fastdfs.googlecode.com/files/fdfs_client-py-1.2.6.tar.gz)

Python’s redis client, go to https://pypi.python.org/pypi/redis to download

# -*- coding: utf-8 -*-
import setting
from fdfs_client.client import *
from fdfs_client.exceptions import *
  
from fdfs_client.connection import *
  
import redis
import time
import logging
import random
  
logging.basicConfig(format='[%(levelname)s]: %(message)s', level=logging.DEBUG)
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
  
  
class RedisError(Exception):
     def __init__(self, value):
         self.value = value
     def __str__(self):
         return repr(self.value)
  
class fastdfsClient(Fdfs_client):
    def __init__(self):
        self.tracker_pool = ConnectionPool(**setting.fdfs_tracker)
        self.timeout  = setting.fdfs_tracker['timeout']
        return None
  
    def __del__(self):
        try:
            self.pool.destroy()
            self.pool = None
        except:
            pass
  
class fastdfs(object):
    def __init__(self):
        '''
        conf_file:配置文件
        '''
        self.fdfs_client = fastdfsClient()
        self.fdfs_redis = []
        for i in setting.fdfs_redis_dbs:
            self.fdfs_redis.append(redis.Redis(host=i[0], port=i[1], db=i[2]))
  
    def store_by_buffer(self,buf,filename=None,file_ext_name = None):
        '''
        buffer存储文件
        参数：
        filename:自定义文件名，如果不指定，将远程file_id作为文件名
        file_ext_name:文件扩展名（可选），如果不指定，将根据自定义文件名智能判断
        返回值：
        {
        'group':组名,
        'file_id':不含组名的文件ID,
        'size':文件尺寸,
        'upload_time':上传时间
        }
        '''
        if filename and  random.choice(self.fdfs_redis).exists(filename):
            logger.info('File(%s) exists.'%filename)
            return   random.choice(self.fdfs_redis).hgetall(filename)
        t1 = time.time()
#        try:
        ret_dict = self.fdfs_client.upload_by_buffer(buf,file_ext_name)
#        except Exception,e:
#            logger.error('Error occurred while uploading: %s'%e.message)
#            return None
        t2 = time.time()
        logger.info('Upload file(%s) by buffer, time consume: %fs' % (filename,(t2 - t1)))
        for key in ret_dict:
            logger.debug('[+] %s : %s' % (key, ret_dict[key]))
        stored_filename = ret_dict['Remote file_id']
        stored_filename_without_group = stored_filename[stored_filename.index('/')+1:]
        if not filename:
            filename =stored_filename_without_group
        vmp = {'group':ret_dict['Group name'],'file_id':stored_filename_without_group,'size':ret_dict['Uploaded size'],'upload_time':int(time.time()*1000)}
        try:
            for i in self.fdfs_redis:
                if not i.hmset(filename,vmp):
                    raise RedisError('Save Failure')
                logger.info('Store file(%s) by buffer successful' % filename)
        except Exception,e:
            logger.error('Save info to Redis failure. rollback...')
            try:
                ret_dict = self.fdfs_client.delete_file(stored_filename)
            except Exception,e:
                logger.error('Error occurred while deleting: %s'%e.message)
            return None
        return vmp
  
    def remove(self,filename):
        '''
        删除文件,
        filename是用户自定义文件名
        return True|False
        '''
        fileinfo = random.choice(self.fdfs_redis).hgetall(filename)
        stored_filename = '%s/%s'%(fileinfo['group'],fileinfo['file_id'])
        try:
            ret_dict = self.fdfs_client.delete_file(stored_filename)
            logger.info('Remove stored file successful')
        except Exception,e:
            logger.error('Error occurred while deleting: %s'%e.message)
            return False
        for i in self.fdfs_redis:
            if not i.delete(filename):
                logger.error('Remove fileinfo in redis failure')
        logger.info('%s removed.'%filename)
        return True
  
    def download(self,filename):
        '''
        下载文件
        返回二进制
        '''
        finfo = self.getInfo(filename)
        if finfo:
            ret = self.fdfs_client.download_to_buffer('%s/%s'%(finfo['group'],finfo['file_id']))
            return ret['Content']
        else:
            logger.debug('%s is not exists'%filename)
            return None
  
    def list(self,pattern='*'):
        '''
        列出文件列表
        '''
        return random.choice(self.fdfs_redis).keys(pattern)
  
    def getInfo(self,filename):
        '''
        获得文件信息
        return:{
        'group':组名,
        'file_id':不含组名的文件ID,
        'size':文件尺寸,
        'upload_time':上传时间
        }
        '''
        return random.choice(self.fdfs_redis).hgetall(filename)

Configuration:

# -*- coding: utf-8 -*-
#fastdfs tracker, multiple tracker supported
fdfs_tracker = {
'host_tuple':('192.168.2.233','192.168.2.234'),
'port':22122,
'timeout':30,
'name':'Tracker Pool'
}
#fastdfs meta db, multiple redisdb supported
fdfs_redis_dbs = (
    ('192.168.2.233',6379,0),
    ('192.168.2.233',6379,1)
)