From 5a1cbdc6f1e32be7b8430924a1125422d8457584 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Thu, 4 Feb 2010 11:06:01 -0800
Subject: Add time-based cutoffs for public tag cloud, favorited lists to speed
 up those queries. Defaulting to only looking at last 90 days of activity, can
 be adjusted up or down.

$config['tag']['cutoff'] = 86400 * 90;
$config['popular']['cutoff'] = 86400 * 90;

Per-user and per-group tag clouds do not use the cutoff (and it doesn't help with indexing on them).
---
 actions/favorited.php           | 3 +++
 actions/publictagcloud.php      | 3 +++
 lib/default.php                 | 6 ++++--
 lib/grouptagcloudsection.php    | 1 +
 lib/personaltagcloudsection.php | 1 +
 lib/popularnoticesection.php    | 7 +++++--
 6 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/actions/favorited.php b/actions/favorited.php
index 9ffa5b844..d8980440d 100644
--- a/actions/favorited.php
+++ b/actions/favorited.php
@@ -186,10 +186,13 @@ class FavoritedAction extends Action
     function showContent()
     {
         $weightexpr = common_sql_weight('fave.modified', common_config('popular', 'dropoff'));
+        $cutoff = sprintf("fave.modified > '%s'",
+                          common_sql_date(time() - common_config('popular', 'cutoff')));
 
         $qry = 'SELECT notice.*, '.
           $weightexpr . ' as weight ' .
           'FROM notice JOIN fave ON notice.id = fave.notice_id ' .
+          "WHERE $cutoff " .
           'GROUP BY id,profile_id,uri,content,rendered,url,created,notice.modified,reply_to,is_local,source,notice.conversation ' .
           'ORDER BY weight DESC';
 
diff --git a/actions/publictagcloud.php b/actions/publictagcloud.php
index 9e4478dbb..9993b2d3f 100644
--- a/actions/publictagcloud.php
+++ b/actions/publictagcloud.php
@@ -106,7 +106,10 @@ class PublictagcloudAction extends Action
         #Add the aggregated columns...
         $tags->selectAdd('max(notice_id) as last_notice_id');
         $calc = common_sql_weight('created', common_config('tag', 'dropoff'));
+        $cutoff = sprintf("notice_tag.created > '%s'",
+                          common_sql_date(time() - common_config('tag', 'cutoff')));
         $tags->selectAdd($calc . ' as weight');
+        $tags->addWhere($cutoff);
         $tags->groupBy('tag');
         $tags->orderBy('weight DESC');
 
diff --git a/lib/default.php b/lib/default.php
index 2bedc4bf0..485a08ba4 100644
--- a/lib/default.php
+++ b/lib/default.php
@@ -144,9 +144,11 @@ $default =
         'invite' =>
         array('enabled' => true),
         'tag' =>
-        array('dropoff' => 864000.0),
+        array('dropoff' => 864000.0,   # controls weighting based on age
+              'cutoff' => 86400 * 90), # only look at notices posted in last 90 days
         'popular' =>
-        array('dropoff' => 864000.0),
+        array('dropoff' => 864000.0,   # controls weighting based on age
+              'cutoff' => 86400 * 90), # only look at notices favorited in last 90 days
         'daemon' =>
         array('piddir' => '/var/run',
               'user' => false,
diff --git a/lib/grouptagcloudsection.php b/lib/grouptagcloudsection.php
index 14ceda085..f1106cc7b 100644
--- a/lib/grouptagcloudsection.php
+++ b/lib/grouptagcloudsection.php
@@ -59,6 +59,7 @@ class GroupTagCloudSection extends TagCloudSection
     function getTags()
     {
         $weightexpr = common_sql_weight('notice_tag.created', common_config('tag', 'dropoff'));
+        // @fixme should we use the cutoff too? Doesn't help with indexing per-group.
 
         $names = $this->group->getAliases();
 
diff --git a/lib/personaltagcloudsection.php b/lib/personaltagcloudsection.php
index 091425f92..5ea3f188d 100644
--- a/lib/personaltagcloudsection.php
+++ b/lib/personaltagcloudsection.php
@@ -59,6 +59,7 @@ class PersonalTagCloudSection extends TagCloudSection
     function getTags()
     {
         $weightexpr = common_sql_weight('notice_tag.created', common_config('tag', 'dropoff'));
+        // @fixme should we use the cutoff too? Doesn't help with indexing per-user.
 
         $qry = 'SELECT notice_tag.tag, '.
           $weightexpr . ' as weight ' .
diff --git a/lib/popularnoticesection.php b/lib/popularnoticesection.php
index fbf9a60ab..296ddbbb5 100644
--- a/lib/popularnoticesection.php
+++ b/lib/popularnoticesection.php
@@ -59,12 +59,15 @@ class PopularNoticeSection extends NoticeSection
             }
         }
         $weightexpr = common_sql_weight('fave.modified', common_config('popular', 'dropoff'));
+        $cutoff = sprintf("fave.modified > '%s'",
+                          common_sql_date(time() - common_config('popular', 'cutoff')));
         $qry = "SELECT notice.*, $weightexpr as weight ";
         if(isset($tag)) {
             $qry .= 'FROM notice_tag, notice JOIN fave ON notice.id = fave.notice_id ' .
-                    "WHERE notice.id = notice_tag.notice_id and '$tag' = notice_tag.tag";
+                    "WHERE $cutoff and notice.id = notice_tag.notice_id and '$tag' = notice_tag.tag";
         } else {
-            $qry .= 'FROM notice JOIN fave ON notice.id = fave.notice_id';
+            $qry .= 'FROM notice JOIN fave ON notice.id = fave.notice_id ' .
+                    "WHERE $cutoff";
         }
         $qry .= ' GROUP BY notice.id,notice.profile_id,notice.content,notice.uri,' .
                 'notice.rendered,notice.url,notice.created,notice.modified,' .
-- 
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