我的代码有什么问题？WSGI、beaker、python、apache2
我正在使用apache2、python26，还有最新版本的beaker和mod_wsgi。
这是我的代码，我是从http://beaker.groovie.org/sessions.html#using上找到的。
from beaker.middleware import SessionMiddleware
def simple_app(environ, start_response):
# Get the session object from the environ
session = environ['beaker.session']
# Check to see if a value is in the session
if 'logged_in' in session:
user = True
else:
user = False
# Set some other session variable
session['user_id'] = 10
start_response('200 OK', [('Content-type', 'text/plain')])
return ['User is logged in: %s' % user]
# Configure the SessionMiddleware
session_opts = {
'session.type': 'file',
'session.cookie_expires': True,
}
wsgi_app = SessionMiddleware(simple_app, session_opts)
当我访问localhost/beaker2.wsgi时，这段代码运行得很好。但是当我尝试做两个改动时，网站就出错了：
1. 添加
session.save()
或者
2. 修改
'session.type': 'cookie',
为什么我在添加session.save()或者把session.type改成cookie时会出现错误呢？
完整的错误追踪信息：
抱歉日期和其他信息，我是用tail -f命令获取的。
这是session.save()错误的信息：
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] mod_wsgi (pid=25311): Exception occurred processing WSGI script '/home/yizi/apache2/www/beaker2.wsgi'.
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] Traceback (most recent call last):
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/middleware.py", line 152, in __call__
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] return self.wrap_app(environ, session_start_response)
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/home/yizi/apache2/www/beaker2.wsgi", line 21, in simple_app
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] start_response('200 OK', [('Content-type', 'text/html')])
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/middleware.py", line 146, in session_start_response
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] session.persist()
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/session.py", line 609, in persist
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] self._session().save()
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/session.py", line 275, in save
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] **self.namespace_args)
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/container.py", line 518, in __init__
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] raise MissingCacheParameter("data_dir or file_dir is required")
[Sun May 01 04:35:55 2011] [error] [client 127.0.0.1] MissingCacheParameter: data_dir or file_dir is required
这是cookie错误的信息：
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] mod_wsgi (pid=25312): Exception occurred processing WSGI script '/home/yizi/apache2/www/beaker2.wsgi'.
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] Traceback (most recent call last):
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/middleware.py", line 152, in __call__
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] return self.wrap_app(environ, session_start_response)
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] File "/home/yizi/apache2/www/beaker2.wsgi", line 10, in simple_app
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] if 'logged_in' in session:
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/session.py", line 579, in __contains__
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] return self._session().has_key(key)
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/session.py", line 547, in _session
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] self.__dict__['_sess'] = CookieSession(req, **params)
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] File "/usr/local/lib/python2.6/dist-packages/Beaker-1.5.4-py2.6.egg/beaker/session.py", line 373, in __init__
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] raise BeakerException("No validate_key specified for Cookie only "
[Sun May 01 04:53:18 2011] [error] [client 127.0.0.1] BeakerException: No validate_key specified for Cookie only Session.
1 个回答
3
关于session.save()的错误，它的意思是你没有告诉程序要把数据保存到哪里，需要通过设置data_dir这个参数来指定保存的路径。
至于cookie的错误，它需要一个秘密钥匙validate_key，这个钥匙是用来在发送cookie到浏览器时进行编码的，同时在从浏览器获取cookie时进行解码和验证。
所以要解决这些问题，你需要添加这些钥匙，并给它们设置你自己的值：
对于文件：
session_opts['data_dir'] = "/some/place/to/save/"
对于cookie：
session_opts['validate_key'] = "some secret value"
session_opts['encrypt_key'] = "some other value"