Flask to autobahn and twisted: RuntimeError: working outside of request context

Question

我想将会话数据从 Flask 部分发送到我应用程序的 Websocket 部分。一个简化的例子是：

from flask import session

class EchoServerProtocol(WebSocketServerProtocol):
    def __init__(self):
        self.user= session.get('user')

    def onMessage(self, payload, isBinary):
        _user=self.user

        self.sendMessage(payload, isBinary, _user)

app = Flask(__name__)

app.secret_key = str(uuid.uuid4())

@app.route('/')
def page_home():
    return render_template('index.html')

（改编自 here）。

我收到错误：

File "app.py", line 171, in __init__
    if session.get('user'):
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 338, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 297, in _get_current_object
    return self.__local()
  File "/usr/local/lib/python2.7/dist-packages/flask/globals.py", line 20, in _lookup_req_object
    raise RuntimeError('working outside of request context')
exceptions.RuntimeError: working outside of request context

Answer 1

我找到的临时解决方案是在Flask部分将用户名保存为pickle对象，并在websocket部分加载pickle对象，如：

from flask import session
import pickle

class EchoServerProtocol(WebSocketServerProtocol):
    def __init__(self):
        self.user=  pickle.load(open('../static/uploads/userfile.p', 'rb'))

    def onMessage(self, payload, isBinary):
        _user=self.user

        self.sendMessage(payload, isBinary, _user)

app = Flask(__name__)

app.secret_key = str(uuid.uuid4())

@app.route('/')
def page_home():
    _user=session.get('user')

    pickle.dump(_user, open('../static/uploads/userfile.p', 'wb'))

    return render_template('index.html')