Stop invalidating the entire session before generating the page...

[zzz-spline-frontpage.git] / splinext / frontpage / controllers / frontpage.py

diff --git a/splinext/frontpage/controllers/frontpage.py b/splinext/frontpage/controllers/frontpage.py
index 4bac44f..900c87b 100644 (file)
--- a/splinext/frontpage/controllers/frontpage.py
+++ b/splinext/frontpage/controllers/frontpage.py
@@ -1,13 +1,15 @@
+import datetime
 import logging
 
 from pylons import config, request, response, session, tmpl_context as c, url
-from pylons.controllers.util import abort, redirect_to
+from pylons.controllers.util import abort, redirect
 from routes import request_config
 from sqlalchemy.orm.exc import NoResultFound
 
 from spline.lib import helpers as h
 from spline.lib.base import BaseController, render
-from spline.lib.plugin.load import run_hooks
+from spline.model import meta
+from splinext.frontpage.sources import max_age_to_datetime
 
 log = logging.getLogger(__name__)
 
@@ -16,18 +18,91 @@ class FrontPageController(BaseController):
     def index(self):
         """Magicaltastic front page.
 
-        Plugins can register things to appear on it, somehow.
+        Plugins can register a hook called 'frontpage_updates_<type>' to add
+        updates to the front page.  `<type>` is an arbitrary string indicating
+        the sort of update the plugin knows how to handle; for example,
+        spline-forum has a `frontpage_updates_forum` hook for posting news from
+        a specific forum.
+
+        Hook handlers should return a list of FrontPageUpdate objects.
+
+        Standard hook parameters are:
+        `limit`, the maximum number of items that should ever be returned.
+        `max_age`, the number of seconds after which items expire.
+        `title`, a name for the source.
+        `icon`, an icon to show next to its name.
+
+        `limit` and `max_age` are also global options.
+
+        Updates are configured in the .ini like so:
+
+            spline-frontpage.sources.foo = updatetype
+            spline-frontpage.sources.foo.opt1 = val1
+            spline-frontpage.sources.foo.opt2 = val2
+
+        Note that the 'foo' name is completely arbitrary and is only used for
+        grouping options together.  This will result in a call to:
+
+            run_hooks('frontpage_updates_updatetype', opt1=val1, opt2=val2)
 
         Local plugins can override the fairly simple index.mako template to
         customize the front page layout.
         """
-        # Hooks should return a list of FrontPageUpdate objects, making this
-        # return value a list of lists
-        updates_lol = run_hooks('frontpage_updates', limit=10)
-        updates = sum(updates_lol, [])
 
-        updates.sort(key=lambda obj: obj.time)
-        updates.reverse()
-        c.updates = updates[0:10]
+        updates = []
+        global_limit = config['spline-frontpage.limit']
+        global_max_age = max_age_to_datetime(
+            config['spline-frontpage.max_age'])
+
+        c.sources = config['spline-frontpage.sources']
+        for source in c.sources:
+            new_updates = source.poll(global_limit, global_max_age)
+            updates.extend(new_updates)
+
+            # Little optimization: once there are global_limit items, anything
+            # older than the oldest cannot possibly make it onto the list.  So,
+            # bump global_max_age to that oldest time if this is ever the case.
+            updates.sort(key=lambda obj: obj.time, reverse=True)
+            del updates[global_limit:]
+
+            if updates and len(updates) == global_limit:
+                global_max_age = updates[-1].time
+
+        # Find the oldest unseen item, to draw a divider after it.
+        # If this stays as None, the divider goes at the top
+        c.last_seen_item = None
+        # Could have a timestamp in the stash if this is a user, or in a cookie
+        # if this session has ever been logged out...
+        times = []
+        for source in (c.user.stash, request.cookies):
+            try:
+                times.append( int(source['frontpage-last-seen-time']) )
+            except (KeyError, ValueError):
+                pass
+
+        if times:
+            last_seen_time = datetime.datetime.fromtimestamp(max(times))
+            for update in updates:
+                if update.time > last_seen_time:
+                    c.last_seen_item = update
+                else:
+                    break
+
+        # Save ~now~ as the last-seen time
+        now = datetime.datetime.now().strftime('%s')
+        if c.user:
+            c.user.stash['frontpage-last-seen-time'] = now
+            meta.Session.add(c.user)
+        else:
+            response.set_cookie('frontpage-last-seen-time', now)
+
+        # Done!  Feed to template
+        c.updates = updates
+
+        ret = render('/index.mako')
 
-        return render('/index.mako')
+        # Commit AFTER rendering the template!  Committing invalidates
+        # everything in the session, undoing any eagerloading that may have
+        # been done by sources
+        meta.Session.commit()
+        return ret