<?php
/**
 * Copyright 2011 Bas de Nooijer. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this listof conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of the copyright holder.
 *
 * @copyright Copyright 2011 Bas de Nooijer <solarium@raspberry.nl>
 * @license http://github.com/basdenooijer/solarium/raw/master/COPYING
 * @link http://www.solarium-project.org/
 *
 * @package Solarium
 * @subpackage Client
 */

/**
 * Basic HTTP adapter using a stream
 *
 * @package Solarium
 * @subpackage Client
 */
class Solarium_Client_Adapter_Http extends Solarium_Client_Adapter
{

    /**
     * Handle Solr communication
     *
     * @throws Solarium_Exception
     * @param Solarium_Client_Request $request
     * @return Solarium_Client_Response
     */
    public function execute($request)
    {
        $context = $this->createContext($request);
        $uri = $this->getBaseUri() . $request->getUri();

        list($data, $headers) = $this->_getData($uri, $context);
        
        $this->check($data, $headers);
        
        return new Solarium_Client_Response($data, $headers);
    }

    /**
     * Check result of a request
     * 
     * @throws Solarium_Client_HttpException
     * @param string $data
     * @param array $headers
     * @return void
     */
    public function check($data, $headers)
    {
        // if there is no data and there are no headers it's a total failure,
        // a connection to the host was impossible.
        if (false === $data && count($headers) == 0) {
            throw new Solarium_Client_HttpException("HTTP request failed");
        }
    }

    /**
     * Create a stream context for a request
     *
     * @param Solarium_Client_Request $request
     * @return resource
     */
    public function createContext($request)
    {
        $method = $request->getMethod();
        $context = stream_context_create(
            array('http' => array(
                'method' => $method,
                'timeout' => $this->getTimeout()
            ))
        );

        if ($method == Solarium_Client_Request::METHOD_POST) {
            $data = $request->getRawData();
            if (null !== $data) {
                stream_context_set_option(
                    $context,
                    'http',
                    'content',
                    $data
                );

                $request->addHeader('Content-Type: text/xml; charset=UTF-8');
            }
        }

        $headers = $request->getHeaders();
        if (count($headers) > 0) {
            stream_context_set_option(
                $context,
                'http',
                'header',
                implode("\r\n", $headers)
            );
        }

        return $context;
    }

    /**
     * Execute request
     *
     * @param string $uri
     * @param resource $context
     * @return array
     */
    protected function _getData($uri, $context)
    {
        // @codeCoverageIgnoreStart
        $data = @file_get_contents($uri, false, $context);

        if (isset($http_response_header)) {
            $headers = $http_response_header;
        } else {
            $headers = array();
        }

        return array($data, $headers);
        // @codeCoverageIgnoreEnd
    }

}