ts-website/lib/phpfastcache/phpFastCache/Drivers/sqlite.php

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2016-06-28 21:18:59 +00:00
<?php
/**
*
* This file is part of phpFastCache.
*
* @license MIT License (MIT)
*
* For full copyright and license information, please see the docs/CREDITS.txt file.
*
* @author Khoa Bui (khoaofgod) <khoaofgod@gmail.com> http://www.phpfastcache.com
* @author Georges.L (Geolim4) <contact@geolim4.com>
*
*/
namespace phpFastCache\Drivers;
use phpFastCache\Core\DriverAbstract;
use PDO;
use PDOException;
use phpFastCache\Exceptions\phpFastCacheDriverException;
/**
* Class sqlite
* @package phpFastCache\Drivers
*/
class sqlite extends DriverAbstract
{
/**
*
*/
const SQLITE_DIR = 'sqlite';
/**
*
*/
const INDEXING_FILE = 'indexing';
/**
* @var int
*/
public $max_size = 10; // 10 mb
/**
* @var array
*/
public $instant = array();
/**
* @var null
*/
public $indexing = null;
/**
* @var string
*/
public $path = '';
/**
* @var int
*/
public $currentDB = 1;
/**
* Init Main Database & Sub Database
* phpFastCache_sqlite constructor.
* @param array $config
* @throws phpFastCacheDriverException
*/
public function __construct($config = array())
{
/**
* init the path
*/
$this->setup($config);
if (!$this->checkdriver()) {
throw new phpFastCacheDriverException('SQLITE is not installed, cannot continue.');
}
if (!file_exists($this->getPath() . '/' . self::SQLITE_DIR)) {
if (!mkdir($this->getPath() . '/' . self::SQLITE_DIR, $this->__setChmodAuto(), true)) {
$this->fallback = true;
}
}
$this->path = $this->getPath() . '/' . self::SQLITE_DIR;
}
/**
* INIT NEW DB
* @param \PDO $db
*/
public function initDB(PDO $db)
{
$db->exec('drop table if exists "caching"');
$db->exec('CREATE TABLE "caching" ("id" INTEGER PRIMARY KEY AUTOINCREMENT, "keyword" VARCHAR UNIQUE, "object" BLOB, "exp" INTEGER)');
$db->exec('CREATE UNIQUE INDEX "cleanup" ON "caching" ("keyword","exp")');
$db->exec('CREATE INDEX "exp" ON "caching" ("exp")');
$db->exec('CREATE UNIQUE INDEX "keyword" ON "caching" ("keyword")');
}
/**
* INIT Indexing DB
* @param \PDO $db
*/
public function initIndexing(PDO $db)
{
// delete everything before reset indexing
$dir = opendir($this->path);
while ($file = readdir($dir)) {
if ($file != '.' && $file != '..' && $file != 'indexing' && $file != 'dbfastcache') {
unlink($this->path . '/' . $file);
}
}
$db->exec('drop table if exists "balancing"');
$db->exec('CREATE TABLE "balancing" ("keyword" VARCHAR PRIMARY KEY NOT NULL UNIQUE, "db" INTEGER)');
$db->exec('CREATE INDEX "db" ON "balancing" ("db")');
$db->exec('CREATE UNIQUE INDEX "lookup" ON "balancing" ("keyword")');
}
/**
* INIT Instant DB
* Return Database of Keyword
* @param $keyword
* @return int
*/
public function indexing($keyword)
{
if ($this->indexing == null) {
$createTable = false;
if (!file_exists($this->path . '/indexing')) {
$createTable = true;
}
$PDO = new PDO("sqlite:" . $this->path . '/' . self::INDEXING_FILE);
$PDO->setAttribute(PDO::ATTR_ERRMODE,
PDO::ERRMODE_EXCEPTION);
if ($createTable == true) {
$this->initIndexing($PDO);
}
$this->indexing = $PDO;
unset($PDO);
$stm = $this->indexing->prepare("SELECT MAX(`db`) as `db` FROM `balancing`");
$stm->execute();
$row = $stm->fetch(PDO::FETCH_ASSOC);
if (!isset($row[ 'db' ])) {
$db = 1;
} elseif ($row[ 'db' ] <= 1) {
$db = 1;
} else {
$db = $row[ 'db' ];
}
// check file size
$size = file_exists($this->path . '/db' . $db) ? filesize($this->path . '/db' . $db) : 1;
$size = round($size / 1024 / 1024, 1);
if ($size > $this->max_size) {
$db = $db + 1;
}
$this->currentDB = $db;
}
// look for keyword
$stm = $this->indexing->prepare("SELECT * FROM `balancing` WHERE `keyword`=:keyword LIMIT 1");
$stm->execute(array(
':keyword' => $keyword,
));
$row = $stm->fetch(PDO::FETCH_ASSOC);
if (isset($row[ 'db' ]) && $row[ 'db' ] != '') {
$db = $row[ 'db' ];
} else {
/*
* Insert new to Indexing
*/
$db = $this->currentDB;
$stm = $this->indexing->prepare("INSERT INTO `balancing` (`keyword`,`db`) VALUES(:keyword, :db)");
$stm->execute(array(
':keyword' => $keyword,
':db' => $db,
));
}
return $db;
}
/**
* @param $keyword
* @param bool $reset
* @return mixed
*/
public function db($keyword, $reset = false)
{
/**
* Default is fastcache
*/
$instant = $this->indexing($keyword);
/**
* init instant
*/
if (!isset($this->instant[ $instant ])) {
// check DB Files ready or not
$createTable = false;
if (!file_exists($this->path . '/db' . $instant) || $reset == true) {
$createTable = true;
}
$PDO = new PDO('sqlite:' . $this->path . '/db' . $instant);
$PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
if ($createTable == true) {
$this->initDB($PDO);
}
$this->instant[ $instant ] = $PDO;
unset($PDO);
}
return $this->instant[ $instant ];
}
/**
* @return bool
*/
public function checkdriver()
{
if (extension_loaded('pdo_sqlite') && is_writable($this->getPath())) {
return true;
}
$this->fallback = true;
return false;
}
/**
* @param $keyword
* @param string $value
* @param int $time
* @param array $option
* @return bool
*/
public function driver_set(
$keyword,
$value = '',
$time = 300,
$option = array()
) {
$skipExisting = isset($option[ 'skipExisting' ]) ? $option[ 'skipExisting' ] : false;
$toWrite = true;
// check in cache first
$in_cache = $this->get($keyword, $option);
if ($skipExisting == true) {
if ($in_cache == null) {
$toWrite = true;
} else {
$toWrite = false;
}
}
if ($toWrite == true) {
try {
$stm = $this->db($keyword)
->prepare("INSERT OR REPLACE INTO `caching` (`keyword`,`object`,`exp`) values(:keyword,:object,:exp)");
$stm->execute(array(
':keyword' => $keyword,
':object' => $this->encode($value),
':exp' => time() + (int)$time,
));
return true;
} catch (\PDOException $e) {
try {
$stm = $this->db($keyword, true)
->prepare("INSERT OR REPLACE INTO `caching` (`keyword`,`object`,`exp`) values(:keyword,:object,:exp)");
$stm->execute(array(
':keyword' => $keyword,
':object' => $this->encode($value),
':exp' => time() + (int)$time,
));
} catch (PDOException $e) {
return false;
}
}
}
return false;
}
/**
* @param $keyword
* @param array $option
* @return mixed|null
*/
public function driver_get($keyword, $option = array())
{
// return null if no caching
// return value if in caching
try {
$stm = $this->db($keyword)
->prepare("SELECT * FROM `caching` WHERE `keyword`=:keyword LIMIT 1");
$stm->execute(array(
':keyword' => $keyword,
));
$row = $stm->fetch(PDO::FETCH_ASSOC);
} catch (PDOException $e) {
try {
$stm = $this->db($keyword, true)
->prepare("SELECT * FROM `caching` WHERE `keyword`=:keyword LIMIT 1");
$stm->execute(array(
':keyword' => $keyword,
));
$row = $stm->fetch(PDO::FETCH_ASSOC);
} catch (PDOException $e) {
return null;
}
}
if ($this->isExpired($row)) {
$this->deleteRow($row);
return null;
}
if (isset($row[ 'id' ])) {
$data = $this->decode($row[ 'object' ]);
return $data;
}
return null;
}
/**
* @param $row
* @return bool
*/
public function isExpired($row)
{
if (isset($row[ 'exp' ]) && time() >= $row[ 'exp' ]) {
return true;
}
return false;
}
/**
* @param $row
* @return bool
*/
public function deleteRow($row)
{
try {
$stm = $this->db($row[ 'keyword' ])
->prepare("DELETE FROM `caching` WHERE (`id`=:id) OR (`exp` <= :U) ");
$stm->execute(array(
':id' => $row[ 'id' ],
':U' => time(),
));
} catch (PDOException $e) {
return false;
}
}
/**
* @param $keyword
* @param array $option
* @return bool
*/
public function driver_delete($keyword, $option = array())
{
try {
$stm = $this->db($keyword)
->prepare("DELETE FROM `caching` WHERE (`keyword`=:keyword) OR (`exp` <= :U)");
$stm->execute(array(
':keyword' => $keyword,
':U' => time(),
));
} catch (PDOException $e) {
return false;
}
}
/**
* Return total cache size + auto removed expired entries
* @param array $option
* @return array
*/
public function driver_stats($option = array())
{
$res = array(
'info' => '',
'size' => '',
'data' => '',
);
$total = 0;
$optimized = 0;
$dir = opendir($this->path);
while ($file = readdir($dir)) {
if ($file != '.' && $file != '..') {
$file_path = $this->path . "/" . $file;
$size = filesize($file_path);
$total = $total + $size;
try {
$PDO = new PDO("sqlite:" . $file_path);
$PDO->setAttribute(PDO::ATTR_ERRMODE,
PDO::ERRMODE_EXCEPTION);
$stm = $PDO->prepare("DELETE FROM `caching` WHERE `exp` <= :U");
$stm->execute(array(
':U' => date('U'),
));
$PDO->exec('VACUUM;');
$size = filesize($file_path);
$optimized = $optimized + $size;
} catch (PDOException $e) {
$size = 0;
$optimized = 0;
}
}
}
$res[ 'size' ] = $optimized;
$res[ 'info' ] = array(
'total before removing expired entries [bytes]' => $total,
'optimized after removing expired entries [bytes]' => $optimized,
);
return $res;
}
/**
* @param array $option
* @return void
*/
public function driver_clean($option = array())
{
// close connection
$this->instant = array();
$this->indexing = null;
// delete everything before reset indexing
$dir = opendir($this->path);
while ($file = readdir($dir)) {
if ($file != '.' && $file != '..') {
unlink($this->path . '/' . $file);
}
}
}
/**
* @param $keyword
* @return bool
*/
public function driver_isExisting($keyword)
{
try {
$stm = $this->db($keyword)
->prepare("SELECT COUNT(`id`) as `total` FROM `caching` WHERE `keyword`=:keyword");
$stm->execute(array(
':keyword' => $keyword,
));
$data = $stm->fetch(PDO::FETCH_ASSOC);
if ($data[ 'total' ] >= 1) {
return true;
} else {
return false;
}
} catch (PDOException $e) {
return false;
}
}
}