<?php

/**

 * Copyright (c) 2009 - 2010, RealDolmen

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above copyright

 *       notice, this list of conditions and the following disclaimer in the

 *       documentation and/or other materials provided with the distribution.

 *     * Neither the name of RealDolmen nor the

 *       names of its contributors may be used to endorse or promote products

 *       derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY RealDolmen ''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 RealDolmen 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.

 *

 * @category   Microsoft

 * @package    Microsoft_WindowsAzure

 * @subpackage Diagnostics

 * @copyright  Copyright (c) 2009 - 2010, RealDolmen (http://www.realdolmen.com)

 * @license    http://phpazure.codeplex.com/license

 * @version    $Id: Storage.php 45989 2010-05-03 12:19:10Z unknown $

 */

if (!defined('W3TC')) {

    die();

}



/**

 * @see Microsoft_WindowsAzure_Storage_Blob

 */

require_once 'Microsoft/WindowsAzure/Storage/Blob.php';



/**

 * @see Microsoft_WindowsAzure_Diagnostics_Exception

 */

require_once 'Microsoft/WindowsAzure/Diagnostics/Exception.php';



/**

 * @see Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance

 */

require_once 'Microsoft/WindowsAzure/Diagnostics/ConfigurationInstance.php';



/**

 * @category   Microsoft

 * @package    Microsoft_WindowsAzure

 * @subpackage Diagnostics

 * @copyright  Copyright (c) 2009 - 2010, RealDolmen (http://www.realdolmen.com)

 * @license    http://phpazure.codeplex.com/license

 */

class Microsoft_WindowsAzure_Diagnostics_Manager

{

	/**

	 * Blob storage client

	 *

	 * @var Microsoft_WindowsAzure_Storage_Blob

	 */

	protected $_blobStorageClient = null;



	/**

	 * Control container name

	 *

	 * @var string

	 */

	protected $_controlContainer = '';



	/**

	 * Create a new instance of Microsoft_WindowsAzure_Diagnostics_Manager

	 *

	 * @param Microsoft_WindowsAzure_Storage_Blob $blobStorageClient Blob storage client

	 * @param string $controlContainer Control container name

	 */

	public function __construct(Microsoft_WindowsAzure_Storage_Blob $blobStorageClient = null, $controlContainer = 'wad-control-container')

	{

		$this->_blobStorageClient = $blobStorageClient;

		$this->_controlContainer = $controlContainer;



		$this->_ensureStorageInitialized();

	}



	/**

	 * Ensure storage has been initialized

	 */

	protected function _ensureStorageInitialized()

	{

		if (!$this->_blobStorageClient->containerExists($this->_controlContainer)) {

			$this->_blobStorageClient->createContainer($this->_controlContainer);

		}

	}



	/**

	 * Get default configuration values

	 *

	 * @return Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance

	 */

	public function getDefaultConfiguration()

	{

		return new Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance();

	}



	/**

	 * Checks if a configuration for a specific role instance exists.

	 *

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @return boolean

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function configurationForRoleInstanceExists($roleInstance = null)

	{

		if (is_null($roleInstance)) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}



		return $this->_blobStorageClient->blobExists($this->_controlContainer, $roleInstance);

	}



	/**

	 * Checks if a configuration for current role instance exists. Only works on Development Fabric or Windows Azure Fabric.

	 *

	 * @return boolean

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function configurationForCurrentRoleInstanceExists()

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}



		return $this->_blobStorageClient->blobExists($this->_controlContainer, $this->_getCurrentRoleInstanceId());

	}



	/**

	 * Get configuration for current role instance. Only works on Development Fabric or Windows Azure Fabric.

	 *

	 * @return Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function getConfigurationForCurrentRoleInstance()

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}

		return $this->getConfigurationForRoleInstance($this->_getCurrentRoleInstanceId());

	}



	/**

	 * Get the current role instance ID. Only works on Development Fabric or Windows Azure Fabric.

	 *

	 * @return string

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	protected function _getCurrentRoleInstanceId()

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}



		if (strpos($_SERVER['RdRoleId'], 'deployment(') === false) {

			return $_SERVER['RdRoleId'];

		} else {

			$roleIdParts = explode('.', $_SERVER['RdRoleId']);

			return $roleIdParts[0] . '/' . $roleIdParts[2] . '/' . $_SERVER['RdRoleId'];

		}

	}



	/**

	 * Set configuration for current role instance. Only works on Development Fabric or Windows Azure Fabric.

	 *

	 * @param Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance $configuration Configuration to apply

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function setConfigurationForCurrentRoleInstance(Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance $configuration)

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}



		$this->setConfigurationForRoleInstance($this->_getCurrentRoleInstanceId(), $configuration);

	}



	/**

	 * Get configuration for a specific role instance

	 *

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @return Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function getConfigurationForRoleInstance($roleInstance = null)

	{

		if (is_null($roleInstance)) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}



		if ($this->_blobStorageClient->blobExists($this->_controlContainer, $roleInstance)) {

			$configurationInstance = new Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance();

			$configurationInstance->loadXml( $this->_blobStorageClient->getBlobData($this->_controlContainer, $roleInstance) );

			return $configurationInstance;

		}



		return new Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance();

	}



	/**

	 * Set configuration for a specific role instance

	 *

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @param Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance $configuration Configuration to apply

	 * @throws Microsoft_WindowsAzure_Diagnostics_Exception

	 */

	public function setConfigurationForRoleInstance($roleInstance = null, Microsoft_WindowsAzure_Diagnostics_ConfigurationInstance $configuration)

	{

		if (is_null($roleInstance)) {

			throw new Microsoft_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}



		$this->_blobStorageClient->putBlobData($this->_controlContainer, $roleInstance, $configuration->toXml(), array(), null, array('Content-Type' => 'text/xml'));

	}

}