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Django Use Filefield in SAE

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sina 有个云平台叫sina app enginee，当然，是山寨google app enginee的。虽然这个东西还在alpha阶段，但是对于我等叼丝程序员来说，免去了购买vps麻烦，免费的总归是好的，即使有点问题，也总比没有的强吧。

最近研究了好几天的sae的storage。总觉得很不爽，因为官方api给的很笼统，看不明白，网上demo不多，几乎都同一个人转载，当然也有牛人，不过没找到牛人的源码，所以只好自己推敲了。

再这里要感谢下falcon同学，自己写了一个ready4sae的storage方法，在我纠结了好久以后，用了一下，发现竟然能够用，真是大喜啊.

下面就先来说说如何使用吧：

1.先建立一个store.py的文件：

#! coding:utf-8

import itertools import sae.storage from datetime import datetime from os.path import basename,splitext from sae.const import APP_NAME from django.conf import settings from django.core.files.storage import Storage from django.utils.http import urlquote

class SaeStorage(Storage):

"""
SAE storage
"""

def __init__(self, domain=None, app=None):
    if app is None:
        app = APP_NAME
    if domain is None:
        domain = settings.SAE_STORAGE_DOMAIN
    self.domain = domain
    self.base_url = "http://%s-%s.stor.sinaapp.com/" % (app,self.domain)
    self.client = sae.storage.Client()

def _open(self, name, mode='rb'):
    """
    not allow in sae, or maybe get the object content and store in memery using StringIO is a good idea. 
    """
    raise sae.storage.PermissionDeniedError('not allow to do this')

def _save(self, name, content):
    name = self.get_available_name(name)
    data = ''.join(content.chunks())
    ob = sae.storage.Object(data)        
    return self.client.put(self.domain, name, ob)

def delete(self, name):
    return self.delete(self.domain, name)

def exists(self, name):
    return name in [ob['name'] for ob in self.client.list(self.domain)]

def listdir(self, path):        
    return [ob['name'] for ob in self.client.list(self.domain)]

def path(self, name):        
    return self.url

def size(self, name):
    ob = self.clien.stat(self.domain,name)
    return ob['length']

def url(self, name):        
    url = self.client.url(self.domain,name)
    return url.replace(urlquote(self.base_url),'')

def accessed_time(self, name):
    return self.created_time()    

def created_time(self, name):
    ob = self.clien.stat(self.domain,name)
    return datetime.fromtimestamp(ob['datetime'])

def modified_time(self, name):
    return self.created_time()    

def get_available_name(self, name):
    count = itertools.count(1)
    while name in (ob['name'] for ob in self.client.list(self.domain)):
        file_root,file_ext = splitext(basename(name))
        name = '%s_%s%s' % (file_root,count.next(),file_ext)
    return name

2.然后在settings.py 里面写好sae mysql 的设置代码，这些网上请自己搜索。

3.建立自己的models.py

from django.db import models
from store import SaeStorage
class Persion(models.Model):
    name = models.CharField(max_length=30)
    photo=models.FileField(
storage=SaeStorage(domain='your_storage_domain',app='your_app_name'))
#    photo = models.FileField(upload_to='xxx')

这里注意下的说，在本地syncdb的时候，要使用默认的storage，不然会报错，但是用dev_server.py的时候是没关系的。

4.就这么简单，本地测试通过的话记得上传到svn，记得把mysql的tables导入到sae先。

5.ps.在此感谢 http://blog.csdn.net/vesslan1029/article/details/7594545 和falcon同学提供的思路。 以上。

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