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<?php

/**
* Static accessor class for site_stats and related things
*/
class SiteStats {
static $row, $loaded = false;
static $admins, $jobs;
static $pageCount = array();
static $groupMemberCounts = array();

static function recache() {
self::load( true );
}

/**
* @param $recache bool
*/
static function load( $recache = false ) {
if ( self::$loaded && !$recache ) {
return;
}

self::$row = self::loadAndLazyInit();

# This code is somewhat schema-agnostic, because I'm changing it in a minor release -- TS
if ( !isset( self::$row->ss_total_pages ) && self::$row->ss_total_pages == -1 ) {
# Update schema
$u = new SiteStatsUpdate( 0, 0, 0 );
$u->doUpdate();
$dbr = wfGetDB( DB_SLAVE );
self::$row = $dbr->selectRow( 'site_stats', '*', false, __METHOD__ );
}

self::$loaded = true;
}

/**
* @return Bool|ResultWrapper
*/
static function loadAndLazyInit() {
wfDebug( __METHOD__ . ": reading site_stats from slave\n" );
$row = self::doLoad( wfGetDB( DB_SLAVE ) );

if( !self::isSane( $row ) ) {
// Might have just been initialized during this request? Underflow?
wfDebug( __METHOD__ . ": site_stats damaged or missing on slave\n" );
$row = self::doLoad( wfGetDB( DB_MASTER ) );
}

if( !self::isSane( $row ) ) {
// Normally the site_stats table is initialized at install time.
// Some manual construction scenarios may leave the table empty or
// broken, however, for instance when importing from a dump into a
// clean schema with mwdumper.
wfDebug( __METHOD__ . ": initializing damaged or missing site_stats\n" );

SiteStatsInit::doAllAndCommit( wfGetDB( DB_SLAVE ) );

$row = self::doLoad( wfGetDB( DB_MASTER ) );
}

if( !self::isSane( $row ) ) {
wfDebug( __METHOD__ . ": site_stats persistently nonsensical o_O\n" );
}
return $row;
}

/**
* @param $db DatabaseBase
* @return Bool|ResultWrapper
*/
static function doLoad( $db ) {
return $db->selectRow( 'site_stats', '*', false, __METHOD__ );
}

/**
* @return int
*/
static function views() {
self::load();
return self::$row->ss_total_views;
}

/**
* @return int
*/
static function edits() {
self::load();
return self::$row->ss_total_edits;
}

/**
* @return int
*/
static function articles() {
self::load();
return self::$row->ss_good_articles;
}

/**
* @return int
*/
static function pages() {
self::load();
return self::$row->ss_total_pages;
}

/**
* @return int
*/
static function users() {
self::load();
return self::$row->ss_users;
}

/**
* @return int
*/
static function activeUsers() {
self::load();
return self::$row->ss_active_users;
}

/**
* @return int
*/
static function images() {
self::load();
return self::$row->ss_images;
}

/**
* Find the number of users in a given user group.
* @param $group String: name of group
* @return Integer
*/
static function numberingroup( $group ) {
if ( !isset( self::$groupMemberCounts[$group] ) ) {
global $wgMemc;
$key = wfMemcKey( 'SiteStats', 'groupcounts', $group );
$hit = $wgMemc->get( $key );
if ( !$hit ) {
$dbr = wfGetDB( DB_SLAVE );
$hit = $dbr->selectField(
'user_groups',
'COUNT(*)',
array( 'ug_group' => $group ),
__METHOD__
);
$wgMemc->set( $key, $hit, 3600 );
}
self::$groupMemberCounts[$group] = $hit;
}
return self::$groupMemberCounts[$group];
}

/**
* @return int
*/
static function jobs() {
if ( !isset( self::$jobs ) ) {
$dbr = wfGetDB( DB_SLAVE );
self::$jobs = $dbr->estimateRowCount( 'job' );
/* Zero rows still do single row read for row that doesn't exist, but people are annoyed by that */
if ( self::$jobs == 1 ) {
self::$jobs = 0;
}
}
return self::$jobs;
}

/**
* @param $ns int
*
* @return int
*/
static function pagesInNs( $ns ) {
wfProfileIn( __METHOD__ );
if( !isset( self::$pageCount[$ns] ) ) {
$dbr = wfGetDB( DB_SLAVE );
self::$pageCount[$ns] = (int)$dbr->selectField(
'page',
'COUNT(*)',
array( 'page_namespace' => $ns ),
__METHOD__
);
}
wfProfileOut( __METHOD__ );
return self::$pageCount[$ns];
}

/**
* Is the provided row of site stats sane, or should it be regenerated?
*
* @param $row
*
* @return bool
*/
private static function isSane( $row ) {
if(
$row === false
|| $row->ss_total_pages < $row->ss_good_articles
|| $row->ss_total_edits < $row->ss_total_pages
) {
return false;
}
// Now check for underflow/overflow
foreach( array( 'total_views', 'total_edits', 'good_articles',
'total_pages', 'users', 'admins', 'images' ) as $member ) {
if(
$row->{"ss_$member"} > 2000000000
|| $row->{"ss_$member"} < 0
) {
return false;
}
}
return true;
}
}

/**
* Class for handling updates to the site_stats table
*/
class SiteStatsUpdate implements DeferrableUpdate {

var $mViews, $mEdits, $mGood, $mPages, $mUsers;

function __construct( $views, $edits, $good, $pages = 0, $users = 0 ) {
$this->mViews = $views;
$this->mEdits = $edits;
$this->mGood = $good;
$this->mPages = $pages;
$this->mUsers = $users;
}

/**
* @param $sql
* @param $field
* @param $delta
*/
function appendUpdate( &$sql, $field, $delta ) {
if ( $delta ) {
if ( $sql ) {
$sql .= ',';
}
if ( $delta < 0 ) {
$sql .= "$field=$field-1";
} else {
$sql .= "$field=$field+1";
}
}
}

function doUpdate() {
$dbw = wfGetDB( DB_MASTER );

$updates = '';

$this->appendUpdate( $updates, 'ss_total_views', $this->mViews );
$this->appendUpdate( $updates, 'ss_total_edits', $this->mEdits );
$this->appendUpdate( $updates, 'ss_good_articles', $this->mGood );
$this->appendUpdate( $updates, 'ss_total_pages', $this->mPages );
$this->appendUpdate( $updates, 'ss_users', $this->mUsers );

if ( $updates ) {
$site_stats = $dbw->tableName( 'site_stats' );
$sql = "UPDATE $site_stats SET $updates";

# Need a separate transaction because this a global lock
$dbw->begin();
$dbw->query( $sql, __METHOD__ );
$dbw->commit();
}
}

/**
* @param $dbw DatabaseBase
* @return bool|mixed
*/
public static function cacheUpdate( $dbw ) {
global $wgActiveUserDays;
$dbr = wfGetDB( DB_SLAVE, array( 'SpecialStatistics', 'vslow' ) );
# Get non-bot users than did some recent action other than making accounts.
# If account creation is included, the number gets inflated ~20+ fold on enwiki.
$activeUsers = $dbr->selectField(
'recentchanges',
'COUNT( DISTINCT rc_user_text )',
array(
'rc_user != 0',
'rc_bot' => 0,
"rc_log_type != 'newusers' OR rc_log_type IS NULL",
"rc_timestamp >= '{$dbw->timestamp( wfTimestamp( TS_UNIX ) - $wgActiveUserDays*24*3600 )}'",
),
__METHOD__
);
$dbw->update(
'site_stats',
array( 'ss_active_users' => intval( $activeUsers ) ),
array( 'ss_row_id' => 1 ),
__METHOD__
);
return $activeUsers;
}
}

/**
* Class designed for counting of stats.
*/
class SiteStatsInit {

// Database connection
private $db;

// Various stats
private $mEdits, $mArticles, $mPages, $mUsers, $mViews, $mFiles = 0;

/**
* Constructor
* @param $database Boolean or DatabaseBase:
* - Boolean: whether to use the master DB
* - DatabaseBase: database connection to use
*/
public function __construct( $database = false ) {
if ( $database instanceof DatabaseBase ) {
$this->db = $database;
} else {
$this->db = wfGetDB( $database ? DB_MASTER : DB_SLAVE );
}
}

/**
* Count the total number of edits
* @return Integer
*/
public function edits() {
$this->mEdits = $this->db->selectField( 'revision', 'COUNT(*)', '', __METHOD__ );
$this->mEdits += $this->db->selectField( 'archive', 'COUNT(*)', '', __METHOD__ );
return $this->mEdits;
}

/**
* Count pages in article space(s)
* @return Integer
*/
public function articles() {
global $wgArticleCountMethod;

$tables = array( 'page' );
$conds = array(
'page_namespace' => MWNamespace::getContentNamespaces(),
'page_is_redirect' => 0,
);

if ( $wgArticleCountMethod == 'link' ) {
$tables[] = 'pagelinks';
$conds[] = 'pl_from=page_id';
} elseif ( $wgArticleCountMethod == 'comma' ) {
// To make a correct check for this, we would need, for each page,
// to load the text, maybe uncompress it, maybe decode it and then
// check if there's one comma.
// But one thing we are sure is that if the page is empty, it can't
// contain a comma :)
$conds[] = 'page_len > 0';
}

$this->mArticles = $this->db->selectField( $tables, 'COUNT(DISTINCT page_id)',
$conds, __METHOD__ );
return $this->mArticles;
}

/**
* Count total pages
* @return Integer
*/
public function pages() {
$this->mPages = $this->db->selectField( 'page', 'COUNT(*)', '', __METHOD__ );
return $this->mPages;
}

/**
* Count total users
* @return Integer
*/
public function users() {
$this->mUsers = $this->db->selectField( 'user', 'COUNT(*)', '', __METHOD__ );
return $this->mUsers;
}

/**
* Count views
* @return Integer
*/
public function views() {
$this->mViews = $this->db->selectField( 'page', 'SUM(page_counter)', '', __METHOD__ );
return $this->mViews;
}

/**
* Count total files
* @return Integer
*/
public function files() {
$this->mFiles = $this->db->selectField( 'image', 'COUNT(*)', '', __METHOD__ );
return $this->mFiles;
}

/**
* Do all updates and commit them. More or less a replacement
* for the original initStats, but without output.
*
* @param $database Boolean or DatabaseBase:
* - Boolean: whether to use the master DB
* - DatabaseBase: database connection to use
* @param $options Array of options, may contain the following values
* - update Boolean: whether to update the current stats (true) or write fresh (false) (default: false)
* - views Boolean: when true, do not update the number of page views (default: true)
* - activeUsers Boolean: whether to update the number of active users (default: false)
*/
public static function doAllAndCommit( $database, array $options = array() ) {
$options += array( 'update' => false, 'views' => true, 'activeUsers' => false );

// Grab the object and count everything
$counter = new SiteStatsInit( $database );

$counter->edits();
$counter->articles();
$counter->pages();
$counter->users();
$counter->files();

// Only do views if we don't want to not count them
if( $options['views'] ) {
$counter->views();
}

// Update/refresh
if( $options['update'] ) {
$counter->update();
} else {
$counter->refresh();
}

// Count active users if need be
if( $options['activeUsers'] ) {
SiteStatsUpdate::cacheUpdate( wfGetDB( DB_MASTER ) );
}
}

/**
* Update the current row with the selected values
*/
public function update() {
list( $values, $conds ) = $this->getDbParams();
$dbw = wfGetDB( DB_MASTER );
$dbw->update( 'site_stats', $values, $conds, __METHOD__ );
}

/**
* Refresh site_stats. Erase the current record and save all
* the new values.
*/
public function refresh() {
list( $values, $conds, $views ) = $this->getDbParams();
$dbw = wfGetDB( DB_MASTER );
$dbw->delete( 'site_stats', $conds, __METHOD__ );
$dbw->insert( 'site_stats', array_merge( $values, $conds, $views ), __METHOD__ );
}

/**
* Return three arrays of params for the db queries
* @return Array
*/
private function getDbParams() {
$values = array(
'ss_total_edits' => $this->mEdits,
'ss_good_articles' => $this->mArticles,
'ss_total_pages' => $this->mPages,
'ss_users' => $this->mUsers,
'ss_images' => $this->mFiles
);
$conds = array( 'ss_row_id' => 1 );
$views = array( 'ss_total_views' => $this->mViews );
return array( $values, $conds, $views );
}
}
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