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|
<?php
namespace Doctrine\Common\Cache;
use SQLite3;
use SQLite3Result;
use const SQLITE3_ASSOC;
use const SQLITE3_BLOB;
use const SQLITE3_TEXT;
use function array_search;
use function implode;
use function serialize;
use function sprintf;
use function time;
use function unserialize;
/**
* SQLite3 cache provider.
*/
class SQLite3Cache extends CacheProvider
{
/**
* The ID field will store the cache key.
*/
public const ID_FIELD = 'k';
/**
* The data field will store the serialized PHP value.
*/
public const DATA_FIELD = 'd';
/**
* The expiration field will store a date value indicating when the
* cache entry should expire.
*/
public const EXPIRATION_FIELD = 'e';
/** @var SQLite3 */
private $sqlite;
/** @var string */
private $table;
/**
* Calling the constructor will ensure that the database file and table
* exist and will create both if they don't.
*
* @param string $table
*/
public function __construct(SQLite3 $sqlite, $table)
{
$this->sqlite = $sqlite;
$this->table = (string) $table;
$this->ensureTableExists();
}
private function ensureTableExists() : void
{
$this->sqlite->exec(
sprintf(
'CREATE TABLE IF NOT EXISTS %s(%s TEXT PRIMARY KEY NOT NULL, %s BLOB, %s INTEGER)',
$this->table,
static::ID_FIELD,
static::DATA_FIELD,
static::EXPIRATION_FIELD
)
);
}
/**
* {@inheritdoc}
*/
protected function doFetch($id)
{
$item = $this->findById($id);
if (! $item) {
return false;
}
return unserialize($item[self::DATA_FIELD]);
}
/**
* {@inheritdoc}
*/
protected function doContains($id)
{
return $this->findById($id, false) !== null;
}
/**
* {@inheritdoc}
*/
protected function doSave($id, $data, $lifeTime = 0)
{
$statement = $this->sqlite->prepare(sprintf(
'INSERT OR REPLACE INTO %s (%s) VALUES (:id, :data, :expire)',
$this->table,
implode(',', $this->getFields())
));
$statement->bindValue(':id', $id);
$statement->bindValue(':data', serialize($data), SQLITE3_BLOB);
$statement->bindValue(':expire', $lifeTime > 0 ? time() + $lifeTime : null);
return $statement->execute() instanceof SQLite3Result;
}
/**
* {@inheritdoc}
*/
protected function doDelete($id)
{
[$idField] = $this->getFields();
$statement = $this->sqlite->prepare(sprintf(
'DELETE FROM %s WHERE %s = :id',
$this->table,
$idField
));
$statement->bindValue(':id', $id);
return $statement->execute() instanceof SQLite3Result;
}
/**
* {@inheritdoc}
*/
protected function doFlush()
{
return $this->sqlite->exec(sprintf('DELETE FROM %s', $this->table));
}
/**
* {@inheritdoc}
*/
protected function doGetStats()
{
// no-op.
}
/**
* Find a single row by ID.
*
* @param mixed $id
*
* @return array|null
*/
private function findById($id, bool $includeData = true) : ?array
{
[$idField] = $fields = $this->getFields();
if (! $includeData) {
$key = array_search(static::DATA_FIELD, $fields);
unset($fields[$key]);
}
$statement = $this->sqlite->prepare(sprintf(
'SELECT %s FROM %s WHERE %s = :id LIMIT 1',
implode(',', $fields),
$this->table,
$idField
));
$statement->bindValue(':id', $id, SQLITE3_TEXT);
$item = $statement->execute()->fetchArray(SQLITE3_ASSOC);
if ($item === false) {
return null;
}
if ($this->isExpired($item)) {
$this->doDelete($id);
return null;
}
return $item;
}
/**
* Gets an array of the fields in our table.
*
* @return array
*/
private function getFields() : array
{
return [static::ID_FIELD, static::DATA_FIELD, static::EXPIRATION_FIELD];
}
/**
* Check if the item is expired.
*
* @param array $item
*/
private function isExpired(array $item) : bool
{
return isset($item[static::EXPIRATION_FIELD]) &&
$item[self::EXPIRATION_FIELD] !== null &&
$item[self::EXPIRATION_FIELD] < time();
}
}
|
