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<?php
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/**
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 * Licensed to Jasig under one or more contributor license
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 * agreements. See the NOTICE file distributed with this work for
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 * additional information regarding copyright ownership.
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 *
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 * Jasig licenses this file to you under the Apache License,
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 * Version 2.0 (the "License"); you may not use this file except in
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 * compliance with the License. You may obtain a copy of the License at:
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 * PHP Version 7
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 *
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 * @file     CAS/Request/AbstractRequest.php
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 * @category Authentication
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 * @package  PhpCAS
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 * @author   Adam Franco <afranco@middlebury.edu>
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 * @license  http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
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 * @link     https://wiki.jasig.org/display/CASC/phpCAS
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 */
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/**
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 * This interface defines a class library for performing multiple web requests
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 * in batches. Implementations of this interface may perform requests serially
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 * or in parallel.
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 *
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 * @class    CAS_Request_CurlMultiRequest
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 * @category Authentication
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 * @package  PhpCAS
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 * @author   Adam Franco <afranco@middlebury.edu>
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 * @license  http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
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 * @link     https://wiki.jasig.org/display/CASC/phpCAS
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 */
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class CAS_Request_CurlMultiRequest
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implements CAS_Request_MultiRequestInterface
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{
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    private $_requests = array();
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    private $_sent = false;
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    /*********************************************************
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     * Add Requests
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    *********************************************************/
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    /**
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     * Add a new Request to this batch.
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     * Note, implementations will likely restrict requests to their own concrete
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     * class hierarchy.
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     *
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     * @param CAS_Request_RequestInterface $request reqest to add
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     *
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     * @return void
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     * @throws CAS_OutOfSequenceException If called after the Request has been sent.
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     * @throws CAS_InvalidArgumentException If passed a Request of the wrong
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     * implmentation.
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     */
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    public function addRequest (CAS_Request_RequestInterface $request)
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    {
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        if ($this->_sent) {
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            throw new CAS_OutOfSequenceException(
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                'Request has already been sent cannot '.__METHOD__
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            );
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        }
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        if (!$request instanceof CAS_Request_CurlRequest) {
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            throw new CAS_InvalidArgumentException(
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                'As a CAS_Request_CurlMultiRequest, I can only work with CAS_Request_CurlRequest objects.'
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            );
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        }
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        $this->_requests[] = $request;
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    }
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    /**
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     * Retrieve the number of requests added to this batch.
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     *
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     * @return int number of request elements
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     * @throws CAS_OutOfSequenceException if the request has already been sent
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     */
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    public function getNumRequests()
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    {
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        if ($this->_sent) {
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            throw new CAS_OutOfSequenceException(
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                'Request has already been sent cannot '.__METHOD__
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            );
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        }
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        return count($this->_requests);
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    }
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    /*********************************************************
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     * 2. Send the Request
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    *********************************************************/
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    /**
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     * Perform the request. After sending, all requests will have their
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     * responses poulated.
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     *
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     * @return bool TRUE on success, FALSE on failure.
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     * @throws CAS_OutOfSequenceException If called multiple times.
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     */
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    public function send ()
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    {
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        if ($this->_sent) {
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            throw new CAS_OutOfSequenceException(
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                'Request has already been sent cannot send again.'
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            );
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        }
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        if (!count($this->_requests)) {
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            throw new CAS_OutOfSequenceException(
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                'At least one request must be added via addRequest() before the multi-request can be sent.'
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            );
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        }
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        $this->_sent = true;
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        // Initialize our handles and configure all requests.
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        $handles = array();
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        $multiHandle = curl_multi_init();
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        foreach ($this->_requests as $i => $request) {
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            $handle = $request->initAndConfigure();
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            curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
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            $handles[$i] = $handle;
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            curl_multi_add_handle($multiHandle, $handle);
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        }
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        // Execute the requests in parallel.
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        do {
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            curl_multi_exec($multiHandle, $running);
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        } while ($running > 0);
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        // Populate all of the responses or errors back into the request objects.
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        foreach ($this->_requests as $i => $request) {
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            $buf = curl_multi_getcontent($handles[$i]);
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            $request->_storeResponseBody($buf);
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            curl_multi_remove_handle($multiHandle, $handles[$i]);
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            curl_close($handles[$i]);
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        }
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        curl_multi_close($multiHandle);
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    }
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}