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FileCache.php
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401 lines (337 loc) · 8.42 KB
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<?php
/*
* This file is heavily inspired and use code from Composer(getcomposer.org),
* in particular Composer/Cache and Composer/Util/FileSystem from 1.0.0-alpha7
*
* The original code and this file are both released under MIT license.
*
* The copyright holders of the original code are:
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*/
namespace WP_CLI;
use DateTime;
use Exception;
use Symfony\Component\Finder\Finder;
use WP_CLI;
/**
* Reads/writes to a filesystem cache
*/
class FileCache {
/**
* @var string cache path
*/
protected $root;
/**
* @var bool
*/
protected $enabled = true;
/**
* @var int files time to live
*/
protected $ttl;
/**
* @var int max total size
*/
protected $max_size;
/**
* @var string key allowed chars (regex class)
*/
protected $whitelist;
/**
* @param string $cache_dir location of the cache
* @param int $ttl cache files default time to live (expiration)
* @param int $max_size max total cache size
* @param string $whitelist List of characters that are allowed in path names (used in a regex character class)
*/
public function __construct( $cache_dir, $ttl, $max_size, $whitelist = 'a-z0-9._-' ) {
$this->root = Utils\trailingslashit( $cache_dir );
$this->ttl = (int) $ttl;
$this->max_size = (int) $max_size;
$this->whitelist = $whitelist;
if ( ! $this->ensure_dir_exists( $this->root ) ) {
$this->enabled = false;
}
}
/**
* Cache is enabled
*
* @return bool
*/
public function is_enabled() {
return $this->enabled;
}
/**
* Cache root
*
* @return string
*/
public function get_root() {
return $this->root;
}
/**
* Check if a file is in cache and return its filename
*
* @param string $key cache key
* @param int $ttl time to live
* @return bool|string filename or false
*/
public function has( $key, $ttl = null ) {
if ( ! $this->enabled ) {
return false;
}
$filename = $this->filename( $key );
if ( ! file_exists( $filename ) ) {
return false;
}
// Use ttl param or global ttl.
if ( null === $ttl ) {
$ttl = $this->ttl;
} elseif ( $this->ttl > 0 ) {
$ttl = min( (int) $ttl, $this->ttl );
} else {
$ttl = (int) $ttl;
}
//
if ( $ttl > 0 && ( filemtime( $filename ) + $ttl ) < time() ) {
if ( $this->ttl > 0 && $ttl >= $this->ttl ) {
unlink( $filename );
}
return false;
}
return $filename;
}
/**
* Write to cache file
*
* @param string $key cache key
* @param string $contents file contents
* @return bool
*/
public function write( $key, $contents ) {
$filename = $this->prepare_write( $key );
if ( $filename ) {
return file_put_contents( $filename, $contents ) && touch( $filename );
}
return false;
}
/**
* Read from cache file
*
* @param string $key cache key
* @param int $ttl time to live
* @return bool|string file contents or false
*/
public function read( $key, $ttl = null ) {
$filename = $this->has( $key, $ttl );
if ( $filename ) {
return file_get_contents( $filename );
}
return false;
}
/**
* Copy a file into the cache
*
* @param string $key cache key
* @param string $source source filename
* @return bool
*/
public function import( $key, $source ) {
$filename = $this->prepare_write( $key );
if ( $filename ) {
return copy( $source, $filename ) && touch( $filename );
}
return false;
}
/**
* Copy a file out of the cache
*
* @param string $key cache key
* @param string $target target filename
* @param int $ttl time to live
* @return bool
*/
public function export( $key, $target, $ttl = null ) {
$filename = $this->has( $key, $ttl );
if ( $filename && $this->ensure_dir_exists( dirname( $target ) ) ) {
return copy( $filename, $target );
}
return false;
}
/**
* Remove file from cache
*
* @param string $key cache key
* @return bool
*/
public function remove( $key ) {
if ( ! $this->enabled ) {
return false;
}
$filename = $this->filename( $key );
if ( file_exists( $filename ) ) {
return unlink( $filename );
}
return false;
}
/**
* Clean cache based on time to live and max size
*
* @return bool
*/
public function clean() {
if ( ! $this->enabled ) {
return false;
}
$ttl = $this->ttl;
$max_size = $this->max_size;
// Unlink expired files.
if ( $ttl > 0 ) {
try {
$expire = new DateTime();
$expire->modify( '-' . $ttl . ' seconds' );
$finder = $this->get_finder()->date( 'until ' . $expire->format( 'Y-m-d H:i:s' ) );
foreach ( $finder as $file ) {
unlink( $file->getRealPath() );
}
} catch ( Exception $e ) {
WP_CLI::error( $e->getMessage() );
}
}
// Unlink older files if max cache size is exceeded.
if ( $max_size > 0 ) {
$files = array_reverse( iterator_to_array( $this->get_finder()->sortByAccessedTime()->getIterator() ) );
$total = 0;
foreach ( $files as $file ) {
if ( ( $total + $file->getSize() ) <= $max_size ) {
$total += $file->getSize();
} else {
unlink( $file->getRealPath() );
}
}
}
return true;
}
/**
* Remove all cached files.
*
* @return bool
*/
public function clear() {
if ( ! $this->enabled ) {
return false;
}
$finder = $this->get_finder();
foreach ( $finder as $file ) {
unlink( $file->getRealPath() );
}
return true;
}
/**
* Remove all cached files except for the newest version of one.
*
* @return bool
*/
public function prune() {
if ( ! $this->enabled ) {
return false;
}
/** @var Finder $finder */
$finder = $this->get_finder()->sortByName();
$files_to_delete = [];
foreach ( $finder as $file ) {
$pieces = explode( '-', $file->getBasename( $file->getExtension() ) );
$timestamp = end( $pieces );
// No way to compare versions, do nothing.
if ( ! is_numeric( $timestamp ) ) {
continue;
}
$basename_without_timestamp = str_replace( '-' . $timestamp, '', $file->getBasename() );
// There's a file with an older timestamp, delete it.
if ( isset( $files_to_delete[ $basename_without_timestamp ] ) ) {
unlink( $files_to_delete[ $basename_without_timestamp ] );
}
$files_to_delete[ $basename_without_timestamp ] = $file->getRealPath();
}
return true;
}
/**
* Ensure directory exists
*
* @param string $dir directory
* @return bool
*/
protected function ensure_dir_exists( $dir ) {
if ( ! is_dir( $dir ) ) {
// Disable the cache if a null device like /dev/null is being used.
if ( preg_match( '{(^|[\\\\/])(\$null|nul|NUL|/dev/null)([\\\\/]|$)}', $dir ) ) {
return false;
}
if ( ! @mkdir( $dir, 0777, true ) ) {
$message = "Failed to create directory '{$dir}'";
$error = error_get_last();
if ( is_array( $error ) && array_key_exists( 'message', $error ) ) {
$message .= ": {$error['message']}";
}
WP_CLI::warning( "{$message}." );
return false;
}
}
return true;
}
/**
* Prepare cache write
*
* @param string $key cache key
* @return bool|string filename or false
*/
protected function prepare_write( $key ) {
if ( ! $this->enabled ) {
return false;
}
$filename = $this->filename( $key );
if ( ! $this->ensure_dir_exists( dirname( $filename ) ) ) {
return false;
}
return $filename;
}
/**
* Validate cache key
*
* @param string $key cache key
* @return string relative filename
*/
protected function validate_key( $key ) {
$url_parts = Utils\parse_url( $key, -1, false );
if ( array_key_exists( 'path', $url_parts ) && ! empty( $url_parts['scheme'] ) ) { // is url
$parts = [ 'misc' ];
$parts[] = $url_parts['scheme'] .
( empty( $url_parts['host'] ) ? '' : '-' . $url_parts['host'] ) .
( empty( $url_parts['port'] ) ? '' : '-' . $url_parts['port'] );
$parts[] = substr( $url_parts['path'], 1 ) .
( empty( $url_parts['query'] ) ? '' : '-' . $url_parts['query'] );
} else {
$key = str_replace( '\\', '/', $key );
$parts = explode( '/', ltrim( $key ) );
}
$parts = preg_replace( "#[^{$this->whitelist}]#i", '-', $parts );
return implode( '/', $parts );
}
/**
* Filename from key
*
* @param string $key
* @return string filename
*/
protected function filename( $key ) {
return $this->root . $this->validate_key( $key );
}
/**
* Get a Finder that iterates in cache root only the files
*
* @return Finder
*/
protected function get_finder() {
return Finder::create()->in( $this->root )->files();
}
}