未在Flask会话中使用Flask-Session扩展名设置密钥
当我连接到我的站点时,出现以下错误:
RuntimeError:会话不可用,因为未设置任何秘密密钥。将应用程序上的secret_key设置为唯一且秘密的内容。
下面是我的服务器代码。
from flask import Flask, sessionfrom flask.ext.session import Session
SESSION_TYPE = 'memcache'
app = Flask(__name__)
sess = Session()
nextId = 0
def verifySessionId():
global nextId
if not 'userId' in session:
session['userId'] = nextId
nextId += 1
sessionId = session['userId']
print ("set userid[" + str(session['userId']) + "]")
else:
print ("using already set userid[" + str(session['userId']) + "]")
sessionId = session.get('userId', None)
return sessionId
@app.route("/")
def hello():
userId = verifySessionId()
print("User id[" + str(userId) + "]")
return str(userId)
if __name__ == "__main__":
app.secret_key = 'super secret key'
sess.init_app(app)
app.debug = True
app.run()
如您所见,我确实设置了应用密钥。我究竟做错了什么?
还有其他会话选项吗?
其他信息:在Linux Mint上运行Python 2.7
全贴:
Traceback (most recent call last): File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/sean/code/misc/session/sessiontest.py", line 27, in hello
userId = verifySessionId()
File "/home/sean/code/misc/session/sessiontest.py", line 16, in verifySessionId
session['userId'] = nextId
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/werkzeug/local.py", line 341, in __setitem__
self._get_current_object()[key] = value
File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/sessions.py", line 126, in _fail
raise RuntimeError('the session is unavailable because no secret '
RuntimeError: the session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secret.
回答:
在你的情况下,NullSessionInterface
会话实现会引发异常,这是使用Flask-Session时的默认会话类型。这是因为你从未真正将SESSION_TYPE
配置提供给Flask;仅在模块中将其设置为全局变量是不够的。所述瓶会话快速启动的示例代码并设置一个全局,但随后通过调用使用当前模块作为配置对象app.config.from_object(__name__)
。
对于Flask 0.10或更高版本,此默认设置没有太大意义;NullSessionFlask 0.8
或0.9可能是有意义的,但是在当前版本中,flask.session.NullSession
该类用作错误信号。就你而言,它现在给你错误的错误消息。
将SESSION_TYPE配置选项设置为其他内容。挑一个redis,memcached,filesystem
或mongodb
,并确保其设置在app.config(直接或通过各种Config.from_*
方法)。
为了进行快速测试,将其设置filesystem
为最简单。那里有足够的默认配置,无需额外的依赖即可正常工作:
if __name__ == "__main__": app.secret_key = 'super secret key'
app.config['SESSION_TYPE'] = 'filesystem'
sess.init_app(app)
app.debug = True
app.run()
如果你看到此错误并且没有使用Flask-Session,则说明设置密码时出了点问题。如果你正在设置app.config[‘SECRET_KEY’]或app.secret_key
处于上述if __name__ == "__main__"
:防护状态,则出现此错误,则可能是通过将Flask项目作为模块导入的WSGI服务器运行了Flask应用程序,并且该__name__ == "__main__"
块永远不会运行。
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