wtf_you_want.py

class BaseNotification(object):
    def serialize(self):
        # here do what the * you want

    def unserialize(self, data):
        # here too

    def render(self, backend):
        # rendering may differ depending on the backend babe

class TextNotification(object):
    def __init__(self, text, **format_kwargs):
        # accept a lazy_rendering option if you want
        self.text = text
        self.format_kwargs = format_kwargs
    
    def serialize(self):
        # do more if you want
        return (self.timestamp, self.text % self.format_kwargs)

    def unserialize(self, data):
        self.timestamp = data[0]
        self.text = data[1]

    def render(self, backend):
        return self.text

class WikiSyntaxNotification(object):
    # what the fuck you want

class TemplateNotification(object):
    # what the fuck you want

# example:
def emit_new_follower(user, follower):
    Subscription.objects.emit(TextNotification(
            text='%(follower)s follows %(user)s',
            user=user,
            follower=follower
        ))
        subscribers_of=[follower, user],
        queue='friends',
    )

# or wikisyntax
def emit_new_follower(user, follower):
    Subscription.objects.emit(TextNotification(
            text='[[%s]] follows [[%s]]' % (follower, user),
            **{
                user.username: user,
                follower.username: follower,
            }
        ))
        subscribers_of=[follower, user],
        queue='friends',
    )

# or with template:
def emit_new_follower(user, follower):
    Subscription.objects.emit(TemplateNotification(
            type='new_follower',
            context={
                'user':user,
                'follower':follower
            },
        ))
        subscribers_of=[follower, user],
        queue='friends',
    )