Reputation: 10661

Tornado - 'Global variables' in tornado?

class MainHandler(BaseHandler):
    @tornado.web.authenticated
    def get(self):
        self.render("index.html", messages=MessageMixin.cache)

So the MainHandler does not pass request or current_user to index.html. But in index.html I tried <p>{{ current_user }}</p> <p>{{ request }}</p> and then there's a lot of output generated. So is this some kind of 'global variable' in Tornado ?

Upvotes: 1

Answers (4)

Ricky Levi

Reputation: 8007

To define custom global variables that I want to be available across the Tornado server/app I just add them to the Application itself while setting up the server:

myapp = tornado.web.Application(... all your settings ... )
myapp.myglobalvar = "somevalue"

Then across your classes you can access it by:

class MyClass(tornado.web.RequestHandler):
   def get(self):
      print("value", self.application.myglobalvar)

Upvotes: 0

lookinghong

Reputation: 91

The secret is in source code!
tornado.web has a function named 'get_template_namespace', you even can overwrite
code detail:

def get_template_namespace(self):
    """ Returns a dictionary to be used as the default template namespace.
    May be overridden by subclasses to add or modify values.
    The results of this method will be combined with additional
    defaults in the tornado.template module and keyword arguments
    to render or render_string.
    """
    namespace = dict(
        handler=self,
        request=self.request,
        current_user=self.current_user,
        locale=self.locale,
        _=self.locale.translate,
        pgettext=self.locale.pgettext,
        static_url=self.static_url,
        xsrf_form_html=self.xsrf_form_html,
        reverse_url=self.reverse_url
    )
    namespace.update(self.ui)
    return namespace

Upvotes: 1