CODEWITHSUNDEEP
pythonglobal-variablestornado
user1869421
user1869421

Reputation: 837

Passing global variables in Tornado classes

To date I have been passing variables from one Tornado class to another by declaring them as global. I think that this might not be the ideal way to do so. Here's a sample of my code:

class MHandler(tornado.web.RequestHandler):
@tornado.web.asynchronous

def get(self):
    self.render('index.html')

def post(self):
    global account_age

    age = self.get_argument('age')

    account_age = [age]


class AgeHandler(tornado.websocket.WebSocketHandler):    
@tornado.web.asynchronous
@gen.engine

def open(self):
    global account_age


    print 'Your account is overdue by: ', account_age

I would like to know, whether in this framework what would be the more appropriate way to share variables.

I've only been doing python and Tornado for just a few weeks, so please excuse my ignorance.

Thanks

Upvotes: 2

Views: 2378

Answers (1)

aychedee
aychedee

Reputation: 25569

Yeah, I wouldn't do that. Even in this simplified example it is clear that you have a race condition between the POST and the websocket opening. How can you guarantee that the person making the POST was the same person opening the websocket?

I usually hold onto a reference to each websocket connection in a global list/dict. Some kind of reference that lets me write the server side output to the correct connection.

Upvotes: 3

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