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Sqlite.php
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Sqlite.php
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<?php
/*
* This file is part of the Stash package.
*
* (c) Robert Hafner <tedivm@tedivm.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Stash\Driver\Sub;
use Stash\Exception\RuntimeException;
use Stash\Exception\InvalidArgumentException;
/**
* @package Stash
* @author Robert Hafner <tedivm@tedivm.com>
*/
class Sqlite
{
protected $path;
protected $driver;
protected $creationSql = 'CREATE TABLE cacheStore (
key TEXT UNIQUE ON CONFLICT REPLACE,
expiration INTEGER,
encoding TEXT,
data BLOB
);
CREATE INDEX keyIndex ON cacheStore (key);';
protected $filePermissions;
protected $dirPermissions;
protected $busyTimeout;
protected $responseCode;
public function __construct($path, $directoryPermission, $filePermission, $busyTimeout)
{
$this->path = $path;
$this->filePermissions = $filePermission;
$this->dirPermissions = $directoryPermission;
$this->busyTimeout = $busyTimeout;
$this->responseCode = 1; // SQLITE_ASSOC
}
public function __destruct()
{
$this->driver = null;
}
public function get($key)
{
if (!($driver = $this->getDriver())) {
return false;
}
$query = $driver->query("SELECT * FROM cacheStore WHERE key LIKE '{$key}'");
if ($query === false) {
return false;
}
if ($resultArray = $query->fetch($this->responseCode)) {
return unserialize(base64_decode($resultArray['data']));
}
return false;
}
public function set($key, $value, $expiration)
{
if (!($driver = $this->getDriver())) {
return false;
}
$data = base64_encode(serialize($value));
$resetBusy = false;
$contentLength = strlen($data);
if ($contentLength > 100000) {
$resetBusy = true;
$this->setTimeout($this->busyTimeout * (ceil($contentLength / 100000))); // .5s per 100k
}
$query = $driver->query("INSERT INTO cacheStore (key, expiration, data)
VALUES ('{$key}', '{$expiration}', '{$data}')");
return true;
}
public function clear($key = null)
{
// return true if the cache is already empty
if (!($driver = $this->getDriver())) {
return true;
}
if (!isset($key)) {
unset($driver);
$this->driver = null;
$this->driver = false;
\Stash\Utilities::deleteRecursive($this->path);
} else {
$query = $driver->query("DELETE FROM cacheStore WHERE key LIKE '{$key}%'");
}
return true;
}
public function purge()
{
if (!($driver = $this->getDriver())) {
return false;
}
$driver->query('DELETE FROM cacheStore WHERE expiration < ' . time());
$driver->query('VACUUM');
return true;
}
public function checkFileSystemPermissions()
{
if(!isset($this->path)) {
throw new RuntimeException('No cache path is set.');
}
if(!is_writable($this->path) && !is_writable(dirname($this->path))) {
throw new InvalidArgumentException('The cache sqlite file is not writable.');
}
}
static public function isAvailable()
{
return class_exists('SQLiteDatabase', false);
}
protected function setTimeout($milliseconds)
{
if (!($driver = $this->getDriver())) {
return false;
}
$driver->busyTimeout($milliseconds);
}
protected function getDriver()
{
if (isset($this->driver) && $this->driver !== false) {
return $this->driver;
}
if (!file_exists($this->path)) {
$dir = $this->path;
// Since PHP will understand paths with mixed slashes- both the windows \ and unix / variants- we have
// to test for both and see which one is the last in the string.
$pos1 = strrpos($this->path, '/');
$pos2 = strrpos($this->path, '\\');
if ($pos1 || $pos2) {
if ($pos1 === false) {
$pos = $pos2;
}
if ($pos2 === false) {
$pos = $pos1;
}
$pos = $pos1 >= $pos2 ? $pos1 : $pos2;
$dir = substr($this->path, 0, $pos);
}
if (!is_dir($dir)) {
mkdir($dir, $this->dirPermissions, true);
}
$runInstall = true;
} else {
$runInstall = false;
}
$db = $this->buildDriver();
if ($runInstall && !$db->query($this->creationSql)) {
unlink($this->path);
throw new RuntimeException('Unable to set SQLite: structure');
}
$this->driver = $db;
// prevent the cache from getting hungup waiting on a return
$this->setTimeout($this->busyTimeout);
return $db;
}
protected function buildDriver()
{
if (!$db = new \SQLiteDatabase($this->path, $this->filePermissions, $errorMessage)) {
throw new RuntimeException('Unable to open SQLite Database: ' . $errorMessage);
}
return $db;
}
}