Move subreddit name search to its own CF.

Subreddit name search is used for recommending
subreddits to users as they type a name on the
submission page.

Also adds a missing script that is needed
to load up the subreddit names into cassandra.
This script should be run occasionally (we do it
once per day) to fill/update the search cache.

r2/r2/lib/subreddit_search.py

@@ -1,10 +1,15 @@
-from r2.models import *
+from r2.models import Subreddit
+from r2.lib.memoize import memoize
+from r2.lib.db.operators import desc
 from r2.lib import utils
+from r2.lib.db import tdb_cassandra
+from r2.lib.cache import CL_ONE
 
-from pylons import g
-
-sr_prefix = 'sr_search_'
-
+class SubredditsByPartialName(tdb_cassandra.View):
+    _use_db = True
+    _value_type = 'pickle'
+    _use_new_ring = True
+    _read_consistency_level = CL_ONE
 
 def load_all_reddits():
     query_cache = {}
@@ -21,11 +26,17 @@ def load_all_reddits():
             if len(names) < 10:
                 names.append(sr.name)
 
-    g.permacache.set_multi(query_cache, prefix = sr_prefix)
+    for name_prefix, subreddits in query_cache.iteritems():
+        SubredditsByPartialName._set_values(name_prefix, {'srs': subreddits})
 
 def search_reddits(query):
     query = str(query.lower())
-    return g.permacache.get(sr_prefix + query) or []
+
+    try:
+        result = SubredditsByPartialName._byID(query)
+        return result.srs
+    except tdb_cassandra.NotFound:
+        return []
 
 @memoize('popular_searches', time = 3600)
 def popular_searches():

scripts/update_sr_names.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+cd ~/reddit/r2
+~/reddit/scripts/saferun.sh /tmp/update_sr_names.pid nice /usr/local/bin/paster --plugin=r2 run run.ini r2/lib/subreddit_search.py -c "load_all_reddits()"