PSFS\base\Cache

Complexity

Total Complexity

30

Size/Duplication

Total Lines	172
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	4

Test Coverage

Coverage

98.65%

Importance

Changes	11
Bugs	2	Features	1

9 Methods

Rating	Name	Duplication	Size	Complexity
A	saveTextToFile()	0	9	3
A	getDataFromFile()	0	9	3
A	hasExpiredCache()	0	6	2
B	extractDataWithFormat()	0	19	5
B	transformData()	0	18	5
A	storeData()	0	5	1
A	readFromCache()	0	13	4
A	needCache()	0	9	4
A	getRequestCacheHash()	0	9	3

<?php
namespace PSFS\base;

use PSFS\base\config\Config;
use PSFS\base\exception\ConfigException;
use PSFS\base\types\SingletonTrait;

/**
 * Class Cache
 * @package PSFS\base
 * Gestión de los ficheros de cache
 */
class Cache
{

    const JSON = 1;
    const TEXT = 2;
    const GZIP = 3;
    const JSONGZ = 4;

    use SingletonTrait;

    /**
     * Método que guarda un text en un fichero
     * @param string $data
     * @param string $path
     * @param boolean $absolute
     * @throws ConfigException
     */
    private function saveTextToFile($data, $path, $absolute = false)
    {
        $absolutePath = ($absolute) ? $path : CACHE_DIR . DIRECTORY_SEPARATOR . $path;
        $filename = basename($absolutePath);
        Config::createDir(str_replace($filename, "", $absolutePath));
        if (false === file_put_contents($absolutePath, $data)) {
            throw new ConfigException(_('No se tienen los permisos suficientes para escribir en el fichero ') . $absolutePath);

This line exceeds maximum limit of 120 characters; contains 127 characters

        }
    }

    /**
     * Método que extrae el texto de un fichero
     * @param string $path
     * @param int $transform
     * @param boolean $absolute
     * @return array|string|null
     */
    public function getDataFromFile($path, $transform = Cache::TEXT, $absolute = false)
    {
        $data = null;
        $absolutePath = ($absolute) ? $path : CACHE_DIR . DIRECTORY_SEPARATOR . $path;
        if (file_exists($absolutePath)) {
            $data = file_get_contents($absolutePath);
        }
        return Cache::extractDataWithFormat($data, $transform);
    }

    /**
     * Método que verifica si un fichero tiene la cache expirada
     * @param string $path
     * @param int $expires
     * @param boolean $absolute
     * @return bool
     */
    private function hasExpiredCache($path, $expires = 300, $absolute = false)
    {
        $absolutePath = ($absolute) ? $path : CACHE_DIR . DIRECTORY_SEPARATOR . $path;
        $lasModificationDate = filemtime($absolutePath);
        return ($lasModificationDate + $expires <= time());
    }

    /**
     * Método que transforma los datos de salida
     * @param string $data
     * @param int $transform
     * @return array|string|null
     */
    public static function extractDataWithFormat($data, $transform = Cache::TEXT)
    {
        switch ($transform) {
            case Cache::JSON:
                $data = json_decode($data, true);
                break;
            case Cache::JSONGZ:
                $data = Cache::extractDataWithFormat($data, Cache::GZIP);
                $data = Cache::extractDataWithFormat($data, Cache::JSON);
                break;
            case Cache::GZIP:
                // TODO implementar
                if(function_exists('gzuncompress')) {
                    $data = gzuncompress($data);
                }
                break;
        }
        return $data;
    }

    /**
     * Método que transforma los datos de entrada del fichero
     * @param string $data
     * @param int $transform
     * @return string
     */
    public static function transformData($data, $transform = Cache::TEXT)
    {
        switch ($transform) {
            case Cache::JSON:
                $data = json_encode($data, JSON_PRETTY_PRINT);
                break;
            case Cache::JSONGZ:
                $data = Cache::transformData($data, Cache::JSON);
                $data = Cache::transformData($data, Cache::GZIP);
                break;
            case Cache::GZIP:
                if(function_exists('gzcompress')) {
                    $data = gzcompress($data);
                }
                break;
        }
        return $data;
    }

    /**
     * Método que guarda en fichero los datos pasados
     * @param $path
     * @param $data
     * @param int $transform
     * @param boolean $absolutePath
     */
    public function storeData($path, $data, $transform = Cache::TEXT, $absolutePath = false)
    {
        $data = Cache::transformData($data, $transform);
        $this->saveTextToFile($data, $path, $absolutePath);
    }

    /**
     * Método que verifica si tiene que leer o no un fichero de cache
     * @param string $path
     * @param int $expires
     * @param callable $function
     * @param int $transform
     * @return string|null
     */
    public function readFromCache($path, $expires = 300, callable $function, $transform = Cache::TEXT)
    {
        $data = null;
        if (file_exists(CACHE_DIR . DIRECTORY_SEPARATOR . $path)) {
            if (null !== $function && $this->hasExpiredCache($path, $expires)) {
                $data = call_user_func($function);
                $this->storeData($path, $data, $transform);
            } else {
                $data = $this->getDataFromFile($path, $transform);
            }
        }
        return $data;
    }

    /**
     * Método estático que revisa si se necesita cachear la respuesta de un servicio o no
     * @return integer|boolean
     */
    public static function needCache()
    {
        $action = Security::getInstance()->getSessionKey("__CACHE__");
        $needCache = false;
        if (null !== $action && array_key_exists("cache", $action) && $action["cache"] > 0) {
            $needCache = $action["cache"];
        }
        return $needCache;
    }

    /**
     * Método que construye un hash para almacenar la cache
     * @return string
     */
    public function getRequestCacheHash()
    {
        $hash = "";
        $action = Security::getInstance()->getSessionKey("__CACHE__");
        if (null !== $action && $action["cache"] > 0) {
            $hash = $action["http"] . " " . $action["slug"];
        }
        return sha1($hash);
    }
}