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<?php
namespace Illuminate\Cache;
use Exception;
use Illuminate\Contracts\Cache\LockProvider;
use Illuminate\Contracts\Cache\Store;
use Illuminate\Contracts\Filesystem\LockTimeoutException;
use Illuminate\Filesystem\Filesystem;
use Illuminate\Filesystem\LockableFile;
use Illuminate\Support\InteractsWithTime;
class FileStore implements Store, LockProvider
{
use InteractsWithTime, HasCacheLock, RetrievesMultipleKeys;
/**
* The Illuminate Filesystem instance.
*
* @var \Illuminate\Filesystem\Filesystem
*/
protected $files;
/**
* The file cache directory.
*
* @var string
*/
protected $directory;
/**
* Octal representation of the cache file permissions.
*
* @var int|null
*/
protected $filePermission;
/**
* Create a new file cache store instance.
*
* @param \Illuminate\Filesystem\Filesystem $files
* @param string $directory
* @param int|null $filePermission
* @return void
*/
public function __construct(Filesystem $files, $directory, $filePermission = null)
{
$this->files = $files;
$this->directory = $directory;
$this->filePermission = $filePermission;
}
/**
* Retrieve an item from the cache by key.
*
* @param string|array $key
* @return mixed
*/
public function get($key)
{
return $this->getPayload($key)['data'] ?? null;
}
/**
* Store an item in the cache for a given number of seconds.
*
* @param string $key
* @param mixed $value
* @param int $seconds
* @return bool
*/
public function put($key, $value, $seconds)
{
$this->ensureCacheDirectoryExists($path = $this->path($key));
$result = $this->files->put(
$path, $this->expiration($seconds).serialize($value), true
);
if ($result !== false && $result > 0) {
$this->ensurePermissionsAreCorrect($path);
return true;
}
return false;
}
/**
* Store an item in the cache if the key doesn't exist.
*
* @param string $key
* @param mixed $value
* @param int $seconds
* @return bool
*/
public function add($key, $value, $seconds)
{
$this->ensureCacheDirectoryExists($path = $this->path($key));
$file = new LockableFile($path, 'c+');
try {
$file->getExclusiveLock();
} catch (LockTimeoutException $e) {
$file->close();
return false;
}
$expire = $file->read(10);
if (empty($expire) || $this->currentTime() >= $expire) {
$file->truncate()
->write($this->expiration($seconds).serialize($value))
->close();
$this->ensurePermissionsAreCorrect($path);
return true;
}
$file->close();
return false;
}
/**
* Create the file cache directory if necessary.
*
* @param string $path
* @return void
*/
protected function ensureCacheDirectoryExists($path)
{
$directory = dirname($path);
if (! $this->files->exists($directory)) {
$this->files->makeDirectory($directory, 0777, true, true);
// We're creating two levels of directories (e.g. 7e/24), so we check them both...
$this->ensurePermissionsAreCorrect($directory);
$this->ensurePermissionsAreCorrect(dirname($directory));
}
}
/**
* Ensure the created node has the correct permissions.
*
* @param string $path
* @return void
*/
protected function ensurePermissionsAreCorrect($path)
{
if (is_null($this->filePermission) ||
intval($this->files->chmod($path), 8) == $this->filePermission) {
return;
}
$this->files->chmod($path, $this->filePermission);
}
/**
* Increment the value of an item in the cache.
*
* @param string $key
* @param mixed $value
* @return int
*/
public function increment($key, $value = 1)
{
$raw = $this->getPayload($key);
return tap(((int) $raw['data']) + $value, function ($newValue) use ($key, $raw) {
$this->put($key, $newValue, $raw['time'] ?? 0);
});
}
/**
* Decrement the value of an item in the cache.
*
* @param string $key
* @param mixed $value
* @return int
*/
public function decrement($key, $value = 1)
{
return $this->increment($key, $value * -1);
}
/**
* Store an item in the cache indefinitely.
*
* @param string $key
* @param mixed $value
* @return bool
*/
public function forever($key, $value)
{
return $this->put($key, $value, 0);
}
/**
* Remove an item from the cache.
*
* @param string $key
* @return bool
*/
public function forget($key)
{
if ($this->files->exists($file = $this->path($key))) {
return $this->files->delete($file);
}
return false;
}
/**
* Remove all items from the cache.
*
* @return bool
*/
public function flush()
{
if (! $this->files->isDirectory($this->directory)) {
return false;
}
foreach ($this->files->directories($this->directory) as $directory) {
$deleted = $this->files->deleteDirectory($directory);
if (! $deleted || $this->files->exists($directory)) {
return false;
}
}
return true;
}
/**
* Retrieve an item and expiry time from the cache by key.
*
* @param string $key
* @return array
*/
protected function getPayload($key)
{
$path = $this->path($key);
// If the file doesn't exist, we obviously cannot return the cache so we will
// just return null. Otherwise, we'll get the contents of the file and get
// the expiration UNIX timestamps from the start of the file's contents.
try {
$expire = substr(
$contents = $this->files->get($path, true), 0, 10
);
} catch (Exception $e) {
return $this->emptyPayload();
}
// If the current time is greater than expiration timestamps we will delete
// the file and return null. This helps clean up the old files and keeps
// this directory much cleaner for us as old files aren't hanging out.
if ($this->currentTime() >= $expire) {
$this->forget($key);
return $this->emptyPayload();
}
try {
$data = unserialize(substr($contents, 10));
} catch (Exception $e) {
$this->forget($key);
return $this->emptyPayload();
}
// Next, we'll extract the number of seconds that are remaining for a cache
// so that we can properly retain the time for things like the increment
// operation that may be performed on this cache on a later operation.
$time = $expire - $this->currentTime();
return compact('data', 'time');
}
/**
* Get a default empty payload for the cache.
*
* @return array
*/
protected function emptyPayload()
{
return ['data' => null, 'time' => null];
}
/**
* Get the full path for the given cache key.
*
* @param string $key
* @return string
*/
protected function path($key)
{
$parts = array_slice(str_split($hash = sha1($key), 2), 0, 2);
return $this->directory.'/'.implode('/', $parts).'/'.$hash;
}
/**
* Get the expiration time based on the given seconds.
*
* @param int $seconds
* @return int
*/
protected function expiration($seconds)
{
$time = $this->availableAt($seconds);
return $seconds === 0 || $time > 9999999999 ? 9999999999 : $time;
}
/**
* Get the Filesystem instance.
*
* @return \Illuminate\Filesystem\Filesystem
*/
public function getFilesystem()
{
return $this->files;
}
/**
* Get the working directory of the cache.
*
* @return string
*/
public function getDirectory()
{
return $this->directory;
}
/**
* Get the cache key prefix.
*
* @return string
*/
public function getPrefix()
{
return '';
}
}
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