Google App Engine 文件代码备份
June 16th, 2008
Google App Engine 不支持直接下载代码文件，所以我们无法直接将服务器上的代码进行备份。如果本地的代码一旦丢失，就很难找回，这点对GAE的用户来说，是相当麻烦的。
好在有人编写了一个工具，用于将GAE站点的代码打包成zip格式并下载。
步骤如下：
1.在根目录下根据manatlan的代码建立zipme.py
2.在app.yaml中加入
- url: /zipme
script: zipme.py3.访问youapp.appspot.com/zipme
zipme.py脚本
#!/usr/bin/env python # -*- coding: UTF-8 -*- """ ########################################################################## ZipMe : GAE Content Downloader ########################################################################## Just add this lines in your app.yaml : - url: /zipme script: zipme.py ########################################################################## """ # manatlan from google.appengine.ext import webapp from google.appengine.api import users import wsgiref.handlers import zipfile import os,re,sys,stat from cStringIO import StringIO def createZip(path): def walktree (top = ".", depthfirst = True): names = os.listdir(top) if not depthfirst: yield top, names for name in names: try: st = os.lstat(os.path.join(top, name)) except os.error: continue if stat.S_ISDIR(st.st_mode): for (newtop, children) in walktree (os.path.join(top, name), depthfirst): yield newtop, children if depthfirst: yield top, names list=[] for (basepath, children) in walktree(path,False): for child in children: f=os.path.join(basepath,child) if os.path.isfile(f): f = f.encode(sys.getfilesystemencoding()) list.append( f ) f=StringIO() file = zipfile.ZipFile(f, "w") for fname in list: nfname=os.path.join(os.path.basename(path),fname[len(path)+1:]) file.write(fname, nfname , zipfile.ZIP_DEFLATED) file.close() f.seek(0) return f class ZipMaker(webapp.RequestHandler): def get(self): if users.is_current_user_admin(): folder = os.path.dirname(__file__) self.response.headers['Content-Type'] = 'application/zip' self.response.headers['Content-Disposition'] = \ 'attachment; filename="%s.zip"' % os.path.basename(folder) fid=createZip(folder) while True: buf=fid.read(2048) if buf=="": break self.response.out.write(buf) fid.close() else: self.response.headers['Content-Type'] = 'text/html' self.response.out.write("<a href=\"%s\">You must be admin</a>." % users.create_login_url("/zipme")) def main(): application = webapp.WSGIApplication( [('/zipme', ZipMaker)], debug=False) wsgiref.handlers.CGIHandler().run(application) if __name__ == "__main__": main()
这段代码会通过google的身份认证来判断访问者是否可以下载代码，所以不用担心代码泄漏。不过还是希望Google可以提供代码备份和数据库备份的功能。
