SQLStatsPlugin to get some profiling data on SQL queries

plugins/SQLStats/SQLStatsPlugin.php

@@ -0,0 +1,83 @@
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2011, StatusNet, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
+/**
+ * Check DB queries for filesorts and such and log em.
+ *
+ * @package SQLStatsPlugin
+ * @maintainer Evan Prodromou <brion@status.net>
+ */
+
+class SQLStatsPlugin extends Plugin
+{
+    protected $queryCount = 0;
+    protected $queryStart = 0;
+    protected $queryTimes = array();
+    protected $queries    = array();
+
+    function onPluginVersion(&$versions)
+    {
+        $versions[] = array('name' => 'SQLStats',
+                            'version' => STATUSNET_VERSION,
+                            'author' => 'Evan Prodromou',
+                            'homepage' => 'http://status.net/wiki/Plugin:SQLStats',
+                            'rawdescription' =>
+                            _m('Debug tool to watch for poorly indexed DB queries.'));
+
+        return true;
+    }
+
+    function onStartDBQuery($obj, $query, &$result)
+    {
+        $this->queryStart = microtime(true);
+        return true;
+    }
+
+    function onEndDBQuery($obj, $query, &$result)
+    {
+        $endTime = microtime(true);
+        $this->queryTimes[] = round(($endTime - $this->queryStart) * 1000);
+        $this->queries[] = trim(preg_replace('/\s/', ' ', $query));
+        $this->queryStart = 0;
+
+        return true;
+    }
+
+    function cleanup()
+    {
+        $this->log(LOG_INFO, sprintf('%d queries this hit (total = %d, avg = %d, max = %d, min = %d)',
+                                     count($this->queryTimes),
+                                     array_sum($this->queryTimes),
+                                     array_sum($this->queryTimes)/count($this->queryTimes),
+                                     max($this->queryTimes),
+                                     min($this->queryTimes)));
+
+        $verbose = common_config('sqlstats', 'verbose');
+
+        if ($verbose) {
+            foreach ($this->queries as $query) {
+                $this->log(LOG_INFO, $query);
+            }
+        }
+    }
+}