使用Flask-Session扩展名未在flask会话中设置密钥

时间:2014-09-28 01:47:54

标签: python session flask

现在我正在使用烧瓶第三方库Flask-Session,我没有运气会议。

当我连接到我的网站时,出现以下错误:

  

RuntimeError:会话不可用,因为没有密钥   组。将应用程序上的secret_key设置为唯一的   秘密。

以下是我的服务器代码。

from flask import Flask, session
from 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。我做错了什么?

是否有其他会话选项?

其他信息: 在Linux Mint上运行Python 2.7

完全粘贴:

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.

3 个答案:

答案 0 :(得分:64)

在您的情况下,NullSessionInterface会话实现引发了异常,当您使用Flask-Session时,该实现是默认会话类型。这是因为您实际上并未将SESSION_TYPE配置提供给Flask ; 还不够将其设置为模块中的全局。 Flask-Session quickstart example code确实设置了全局,但是通过调用app.config.from_object(__name__)将当前模块用作配置对象。

对于Flask 0.10或更新版本,此默认值没有多大意义; NullSession可能对Flask 0.8或0.9有意义,但在当前版本中,flask.session.NullSession class用作错误信号。在你的情况下,它现在给你错误的错误信息。

SESSION_TYPE配置选项设置为其他选项。选择redismemcachedfilesystemmongodb中的一个,并确保在app.config中设置(直接或通过various Config.from_* methods

要进行快速测试,将其设置为filesystem是最简单的;有足够的默认配置可以在没有其他依赖项的情况下完成工作:

if __name__ == "__main__":
    app.secret_key = 'super secret key'
    app.config['SESSION_TYPE'] = 'filesystem'

    sess.init_app(app)

    app.debug = True
    app.run()

如果你看到这个错误并且使用Flask-Session,那么设置秘密会出现问题。如果您在上面的app.config['SECRET_KEY']警卫中设置app.secret_keyif __name__ == "__main__":并且您收到此错误,那么您可能正在通过导入Flask项目的WSGI服务器运行Flask应用程序作为模块__name__ == "__main__"块永远不会运行。

无论如何,manage configuration for Flask apps in a separate file总是更好。

答案 1 :(得分:44)

将密钥设置在if __name__ == '__main__':

之外

app.py:

from flask import Flask, session

app = Flask(__name__)
app.secret_key = "super secret key"

@app.route("/")
...

if __name__ == '__main__':
    app.debug = True
    app.run()

当您通过运行flask run启动应用时,会跳过if __name__ == '__main__':块。如果您不想跳过它,请使用python app.py

运行

答案 2 :(得分:9)

试试这个:

app = Flask(__name__)
app.config['SESSION_TYPE'] = 'memcached'
app.config['SECRET_KEY'] = 'super secret key'
sess = Session()

并删除底部的app.secret_key作业。