splinext/frontpage/controllers/frontpage.py

   1 import logging
   2
   3 from pylons import config, request, response, session, tmpl_context as c, url
   4 from pylons.controllers.util import abort, redirect_to
   5 from routes import request_config
   6 from sqlalchemy.orm.exc import NoResultFound
   7
   8 from spline.lib import helpers as h
   9 from spline.lib.base import BaseController, render
  10 from splinext.frontpage.sources import max_age_to_datetime
  11
  12 log = logging.getLogger(__name__)
  13
  14 class FrontPageController(BaseController):
  15
  16     def index(self):
  17         """Magicaltastic front page.
  18
  19         Plugins can register a hook called 'frontpage_updates_<type>' to add
  20         updates to the front page.  `<type>` is an arbitrary string indicating
  21         the sort of update the plugin knows how to handle; for example,
  22         spline-forum has a `frontpage_updates_forum` hook for posting news from
  23         a specific forum.
  24
  25         Hook handlers should return a list of FrontPageUpdate objects.
  26
  27         Standard hook parameters are:
  28         `limit`, the maximum number of items that should ever be returned.
  29         `max_age`, the number of seconds after which items expire.
  30         `title`, a name for the source.
  31         `icon`, an icon to show next to its name.
  32
  33         `limit` and `max_age` are also global options.
  34
  35         Updates are configured in the .ini like so:
  36
  37             spline-frontpage.sources.foo = updatetype
  38             spline-frontpage.sources.foo.opt1 = val1
  39             spline-frontpage.sources.foo.opt2 = val2
  40
  41         Note that the 'foo' name is completely arbitrary and is only used for
  42         grouping options together.  This will result in a call to:
  43
  44             run_hooks('frontpage_updates_updatetype', opt1=val1, opt2=val2)
  45
  46         Local plugins can override the fairly simple index.mako template to
  47         customize the front page layout.
  48         """
  49
  50         updates = []
  51         global_limit = config['spline-frontpage.limit']
  52         global_max_age = max_age_to_datetime(
  53             config['spline-frontpage.max_age'])
  54
  55         for source in config['spline-frontpage.sources']:
  56             new_updates = source.poll(global_limit, global_max_age)
  57             updates.extend(new_updates)
  58
  59             # Little optimization: once there are global_limit items, anything
  60             # older than the oldest cannot possibly make it onto the list.  So,
  61             # bump global_max_age to that oldest time if this is ever the case.
  62             updates.sort(key=lambda obj: obj.time, reverse=True)
  63             del updates[global_limit:]
  64
  65             if updates and len(updates) == global_limit:
  66                 global_max_age = updates[-1].time
  67
  68         # Done!  Feed to template
  69         c.updates = updates
  70
  71         return render('/index.mako')