<?php
/**
* Application class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\base;
use yii\base\Exception;
/**
* Application is the base class for all application classes.
*
* An application serves as the global context that the user request
* is being processed. It manages a set of application components that
* provide specific functionalities to the whole application.
*
* The core application components provided by Application are the following:
* < ul >
* < li > {@link getErrorHandler errorHandler}: handles PHP errors and
* uncaught exceptions. This application component is dynamically loaded when needed.< / li >
* < li > {@link getSecurityManager securityManager}: provides security-related
* services, such as hashing, encryption. This application component is dynamically
* loaded when needed.< / li >
* < li > {@link getStatePersister statePersister}: provides global state
* persistence method. This application component is dynamically loaded when needed.< / li >
* < li > {@link getCache cache}: provides caching feature. This application component is
* disabled by default.< / li >
* < li > {@link getMessages messages}: provides the message source for translating
* application messages. This application component is dynamically loaded when needed.< / li >
* < li > {@link getCoreMessages coreMessages}: provides the message source for translating
* Yii framework messages. This application component is dynamically loaded when needed.< / li >
* < / ul >
*
* Application will undergo the following lifecycles when processing a user request:
* < ol >
* < li > load application configuration;< / li >
* < li > set up class autoloader and error handling;< / li >
* < li > load static application components;< / li >
* < li > {@link beforeRequest}: preprocess the user request; `beforeRequest` event raised.< / li >
* < li > {@link processRequest}: process the user request;< / li >
* < li > {@link afterRequest}: postprocess the user request; `afterRequest` event raised.< / li >
* < / ol >
*
* Starting from lifecycle 3, if a PHP error or an uncaught exception occurs,
* the application will switch to its error handling logic and jump to step 6 afterwards.
*
* @property string $basePath Returns the root path of the application.
* @property CCache $cache Returns the cache component.
* @property CPhpMessageSource $coreMessages Returns the core message translations.
* @property CDateFormatter $dateFormatter Returns the locale-dependent date formatter.
* @property CDbConnection $db Returns the database connection component.
* @property CErrorHandler $errorHandler Returns the error handler component.
* @property string $extensionPath Returns the root directory that holds all third-party extensions.
* @property string $id Returns the unique identifier for the application.
* @property string $language Returns the language that the user is using and the application should be targeted to.
* @property CLocale $locale Returns the locale instance.
* @property string $localeDataPath Returns the directory that contains the locale data.
* @property CMessageSource $messages Returns the application message translations component.
* @property CNumberFormatter $numberFormatter The locale-dependent number formatter.
* @property CHttpRequest $request Returns the request component.
* @property string $runtimePath Returns the directory that stores runtime files.
* @property CSecurityManager $securityManager Returns the security manager component.
* @property CStatePersister $statePersister Returns the state persister component.
* @property string $timeZone Returns the time zone used by this application.
* @property CUrlManager $urlManager Returns the URL manager component.
* @property string $baseUrl Returns the relative URL for the application
* @property string $homeUrl the homepage URL
*
* @author Qiang Xue < qiang.xue @ gmail . com >
* @since 2.0
*/
abstract class Application extends Module
{
/**
* @var string the application name. Defaults to 'My Application'.
*/
public $name = 'My Application';
/**
* @var string the charset currently used for the application. Defaults to 'UTF-8'.
*/
public $charset = 'UTF-8';
/**
* @var string the language that the application is written in. This mainly refers to
* the language that the messages and view files are in. Defaults to 'en_us' (US English).
* @see language
*/
public $sourceLanguage = 'en_us';
private $_runtimePath;
private $_globalState;
private $_stateChanged;
private $_ended = false;
private $_language;
/**
* Processes the request.
* This is the place where the actual request processing work is done.
* Derived classes should override this method.
*/
abstract public function processRequest();
/**
* Constructor.
* @param mixed $config application configuration.
* If a string, it is treated as the path of the file that contains the configuration;
* If an array, it is the actual configuration information.
* Please make sure you specify the {@link getBasePath basePath} property in the configuration,
* which should point to the directory containing all application logic, template and data.
* If not, the directory will be defaulted to 'protected'.
*/
public function __construct($basePath)
{
\Yii::$application = $this;
$this->setBasePath($basePath);
\Yii::setAlias('application', $this->getBasePath());
$this->initSystemHandlers();
$this->registerCoreComponents();
}
/**
* Initializes the module.
* This method is called after the module is created and initialized with property values
* given in configuration.
*/
public function init()
{
$this->preloadComponents();
}
/**
* Runs the application.
* This method loads static application components. Derived classes usually overrides this
* method to do more application-specific tasks.
* Remember to call the parent implementation so that static application components are loaded.
*/
public function run()
{
$this->beforeRequest();
$this->processRequest();
$this->afterRequest();
}
/**
* Terminates the application.
* This method replaces PHP's exit() function by calling [[afterRequest()]] before exiting.
* @param integer $status exit status (value 0 means normal exit while other values mean abnormal exit).
* @param boolean $exit whether to exit the current request.
* It defaults to true, meaning the PHP's exit() function will be called at the end of this method.
*/
public function end($status = 0, $exit = true)
{
if (!$this->_ended) {
$this->_ended = true;
$this->afterRequest();
}
if ($exit) {
exit($status);
}
}
/**
* Raises the [[beforeRequest]] event right BEFORE the application processes the request.
*/
public function beforeRequest()
{
$this->trigger('beforeRequest');
}
/**
* Raises the [[afterRequest]] event right AFTER the application processes the request.
*/
public function afterRequest()
{
$this->trigger('afterRequest');
}
/**
* Returns the unique identifier for the application.
* @return string the unique identifier for the application.
*/
public function getId()
{
if (($id = parent::getId()) === null) {
$id = sprintf('%x', crc32($this->getBasePath() . $this->name));
$this->setId($id);
}
return $id;
}
/**
* Returns the directory that stores runtime files.
* @return string the directory that stores runtime files. Defaults to 'protected/runtime'.
*/
public function getRuntimePath()
{
if ($this->_runtimePath !== null) {
return $this->_runtimePath;
} else {
$this->setRuntimePath($this->getBasePath() . DIRECTORY_SEPARATOR . 'runtime');
return $this->_runtimePath;
}
}
/**
* Sets the directory that stores runtime files.
* @param string $path the directory that stores runtime files.
* @throws Exception if the directory does not exist or is not writable
*/
public function setRuntimePath($path)
{
if (!is_dir($path) || !is_writable($path)) {
throw new \yii\base\Exception("Application runtime path \"$path\" is invalid. Please make sure it is a directory writable by the Web server process.");
}
$this->_runtimePath = $path;
}
/**
* Returns the language that the end user is using.
* @return string the language that the user is using (e.g. 'en_US', 'zh_CN').
* Defaults to the value of [[sourceLanguage]].
*/
public function getLanguage()
{
return $this->_language === null ? $this->sourceLanguage : $this->_language;
}
/**
* Specifies which language the end user is using.
* This is the language that the application should use to display to end users.
* By default, [[language]] and [[sourceLanguage]] are the same.
* Do not set this property unless your application needs to support multiple languages.
* @param string $language the user language (e.g. 'en_US', 'zh_CN').
* If it is null, the {@link sourceLanguage} will be used.
*/
public function setLanguage($language)
{
$this->_language = $language;
}
/**
* Returns the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_get().
* @return string the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-get.php
*/
public function getTimeZone()
{
return date_default_timezone_get();
}
/**
* Sets the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_set().
* @param string $value the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-set.php
*/
public function setTimeZone($value)
{
date_default_timezone_set($value);
}
/**
* Returns the localized version of a specified file.
*
* The searching is based on the specified language code. In particular,
* a file with the same name will be looked for under the subdirectory
* named as the locale ID. For example, given the file "path/to/view.php"
* and locale ID "zh_cn", the localized file will be looked for as
* "path/to/zh_cn/view.php". If the file is not found, the original file
* will be returned.
*
* For consistency, it is recommended that the locale ID is given
* in lower case and in the format of LanguageID_RegionID (e.g. "en_us").
*
* @param string $srcFile the original file
* @param string $srcLanguage the language that the original file is in. If null, the application {@link sourceLanguage source language} is used.
* @param string $language the desired language that the file should be localized to. If null, the {@link getLanguage application language} will be used.
* @return string the matching localized file. The original file is returned if no localized version is found
* or if source language is the same as the desired language.
*/
public function findLocalizedFile($srcFile, $srcLanguage = null, $language = null)
{
if ($srcLanguage === null) {
$srcLanguage = $this->sourceLanguage;
}
if ($language === null) {
$language = $this->getLanguage();
}
if ($language === $srcLanguage) {
return $srcFile;
}
$desiredFile = dirname($srcFile) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($srcFile);
return is_file($desiredFile) ? $desiredFile : $srcFile;
}
/**
* Returns the locale instance.
* @param string $localeID the locale ID (e.g. en_US). If null, the {@link getLanguage application language ID} will be used.
* @return CLocale the locale instance
*/
public function getLocale($localeID = null)
{
return CLocale::getInstance($localeID === null ? $this->getLanguage() : $localeID);
}
/**
* Returns the directory that contains the locale data.
* @return string the directory that contains the locale data. It defaults to 'framework/i18n/data'.
*/
public function getLocaleDataPath()
{
return CLocale::$dataPath === null ? \Yii::getPathOfAlias('system.i18n.data') : CLocale::$dataPath;
}
/**
* Sets the directory that contains the locale data.
* @param string $value the directory that contains the locale data.
*/
public function setLocaleDataPath($value)
{
CLocale::$dataPath = $value;
}
/**
* @return CNumberFormatter the locale-dependent number formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getNumberFormatter()
{
return $this->getLocale()->getNumberFormatter();
}
/**
* Returns the locale-dependent date formatter.
* @return CDateFormatter the locale-dependent date formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getDateFormatter()
{
return $this->getLocale()->getDateFormatter();
}
/**
* Returns the database connection component.
* @return \yii\db\dao\Connection the database connection
*/
public function getDb()
{
return $this->getComponent('db');
}
/**
* Returns the error handler component.
* @return ErrorHandler the error handler application component.
*/
public function getErrorHandler()
{
return $this->getComponent('errorHandler');
}
/**
* Returns the security manager component.
* @return SecurityManager the security manager application component.
*/
public function getSecurityManager()
{
return $this->getComponent('securityManager');
}
/**
* Returns the state persister component.
* @return CStatePersister the state persister application component.
*/
public function getStatePersister()
{
return $this->getComponent('statePersister');
}
/**
* Returns the cache component.
* @return \yii\caching\Cache the cache application component. Null if the component is not enabled.
*/
public function getCache()
{
return $this->getComponent('cache');
}
/**
* Returns the core message translations component.
* @return \yii\i18n\MessageSource the core message translations
*/
public function getCoreMessages()
{
return $this->getComponent('coreMessages');
}
/**
* Returns the application message translations component.
* @return \yii\i18n\MessageSource the application message translations
*/
public function getMessages()
{
return $this->getComponent('messages');
}
/**
* Returns the request component.
* @return Request the request component
*/
public function getRequest()
{
return $this->getComponent('request');
}
/**
* Returns a global value.
*
* A global value is one that is persistent across users sessions and requests.
* @param string $key the name of the value to be returned
* @param mixed $defaultValue the default value. If the named global value is not found, this will be returned instead.
* @return mixed the named global value
* @see setGlobalState
*/
public function getGlobalState($key, $defaultValue = null)
{
if ($this->_globalState === null) {
$this->loadGlobalState();
}
return isset($this->_globalState[$key]) ? $this->_globalState[$key] : $defaultValue;
}
/**
* Sets a global value.
*
* A global value is one that is persistent across users sessions and requests.
* Make sure that the value is serializable and unserializable.
* @param string $key the name of the value to be saved
* @param mixed $value the global value to be saved. It must be serializable.
* @param mixed $defaultValue the default value. If the named global value is the same as this value, it will be cleared from the current storage.
* @see getGlobalState
*/
public function setGlobalState($key, $value, $defaultValue = null)
{
if ($this->_globalState === null) {
$this->loadGlobalState();
}
$changed = $this->_stateChanged;
if ($value === $defaultValue) {
if (isset($this->_globalState[$key])) {
unset($this->_globalState[$key]);
$this->_stateChanged = true;
}
} elseif (!isset($this->_globalState[$key]) || $this->_globalState[$key] !== $value) {
$this->_globalState[$key] = $value;
$this->_stateChanged = true;
}
if ($this->_stateChanged !== $changed) {
$this->on('afterRequest', array($this, 'saveGlobalState'));
}
}
/**
* Clears a global value.
*
* The value cleared will no longer be available in this request and the following requests.
* @param string $key the name of the value to be cleared
*/
public function clearGlobalState($key)
{
$this->setGlobalState($key, null);
}
/**
* Loads the global state data from persistent storage.
* @see getStatePersister
* @throws \yii\base\Exception if the state persister is not available
*/
public function loadGlobalState()
{
$persister = $this->getStatePersister();
if (($this->_globalState = $persister->load()) === null) {
$this->_globalState = array();
}
$this->_stateChanged = false;
$this->off('afterRequest', array($this, 'saveGlobalState'));
}
/**
* Saves the global state data into persistent storage.
* @see getStatePersister
* @throws \yii\base\Exception if the state persister is not available
*/
public function saveGlobalState()
{
if ($this->_stateChanged) {
$this->_stateChanged = false;
$this->off('afterRequest', array($this, 'saveGlobalState'));
$this->getStatePersister()->save($this->_globalState);
}
}
/**
* Handles uncaught PHP exceptions.
*
* This method is implemented as a PHP exception handler. It requires
* that constant YII_ENABLE_EXCEPTION_HANDLER be defined true.
*
* This method will first raise an `exception` event.
* If the exception is not handled by any event handler, it will call
* {@link getErrorHandler errorHandler} to process the exception.
*
* The application will be terminated by this method.
*
* @param Exception $exception exception that is not caught
*/
public function handleException($exception)
{
// disable error capturing to avoid recursive errors
restore_error_handler();
restore_exception_handler();
$category = 'exception.' . get_class($exception);
if ($exception instanceof \yii\web\HttpException) {
$category .= '.' . $exception->statusCode;
}
// php < 5.2 doesn ' t support string conversion auto-magically
$message = $exception->__toString();
if (isset($_SERVER['REQUEST_URI'])) {
$message .= ' REQUEST_URI=' . $_SERVER['REQUEST_URI'];
}
\Yii::error($message, $category);
try
{
// TODO: do we need separate exception class as it was in 1.1?
//$event = new CExceptionEvent($this, $exception);
$event = new Event($this, array('exception' => $exception));
$this->onException($event);
if (!$event->handled) {
// try an error handler
if (($handler = $this->getErrorHandler()) !== null) {
$handler->handle($event);
} else
{
$this->displayException($exception);
}
}
}
catch (Exception $e)
{
$this->displayException($e);
}
try
{
$this->end(1);
}
catch (Exception $e)
{
// use the most primitive way to log error
$msg = get_class($e) . ': ' . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
$msg .= $e->getTraceAsString() . "\n";
$msg .= "Previous exception:\n";
$msg .= get_class($exception) . ': ' . $exception->getMessage() . ' (' . $exception->getFile() . ':' . $exception->getLine() . ")\n";
$msg .= $exception->getTraceAsString() . "\n";
$msg .= '$_SERVER=' . var_export($_SERVER, true);
error_log($msg);
exit(1);
}
}
/**
* Handles PHP execution errors such as warnings, notices.
*
* This method is implemented as a PHP error handler. It requires
* that constant YII_ENABLE_ERROR_HANDLER be defined true.
*
* This method will first raise an `error` event.
* If the error is not handled by any event handler, it will call
* {@link getErrorHandler errorHandler} to process the error.
*
* The application will be terminated by this method.
*
* @param integer $code the level of the error raised
* @param string $message the error message
* @param string $file the filename that the error was raised in
* @param integer $line the line number the error was raised at
*/
public function handleError($code, $message, $file, $line)
{
if ($code & error_reporting()) {
// disable error capturing to avoid recursive errors
restore_error_handler();
restore_exception_handler();
$log = "$message ($file:$line)\nStack trace:\n";
$trace = debug_backtrace();
// skip the first 3 stacks as they do not tell the error position
if (count($trace) > 3) {
$trace = array_slice($trace, 3);
}
foreach ($trace as $i => $t)
{
if (!isset($t['file'])) {
$t['file'] = 'unknown';
}
if (!isset($t['line'])) {
$t['line'] = 0;
}
if (!isset($t['function'])) {
$t['function'] = 'unknown';
}
$log .= "#$i {$t['file']}( {$t['line']}): ";
if (isset($t['object']) & & is_object($t['object'])) {
$log .= get_class($t['object']) . '->';
}
$log .= " {$t['function']}()\n";
}
if (isset($_SERVER['REQUEST_URI'])) {
$log .= 'REQUEST_URI=' . $_SERVER['REQUEST_URI'];
}
\Yii::error($log, 'php');
try
{
\Yii::import('CErrorEvent', true);
$event = new CErrorEvent($this, $code, $message, $file, $line);
$this->onError($event);
if (!$event->handled) {
// try an error handler
if (($handler = $this->getErrorHandler()) !== null) {
$handler->handle($event);
} else
{
$this->displayError($code, $message, $file, $line);
}
}
}
catch (Exception $e)
{
$this->displayException($e);
}
try
{
$this->end(1);
}
catch (Exception $e)
{
// use the most primitive way to log error
$msg = get_class($e) . ': ' . $e->getMessage() . ' (' . $e->getFile() . ':' . $e->getLine() . ")\n";
$msg .= $e->getTraceAsString() . "\n";
$msg .= "Previous error:\n";
$msg .= $log . "\n";
$msg .= '$_SERVER=' . var_export($_SERVER, true);
error_log($msg);
exit(1);
}
}
}
/**
* Raised when an uncaught PHP exception occurs.
*
* An event handler can set the {@link ExceptionEvent::handled handled}
* property of the event parameter to be true to indicate no further error
* handling is needed. Otherwise, the {@link getErrorHandler errorHandler}
* application component will continue processing the error.
*
* @param ExceptionEvent $event event parameter
*/
public function onException($event)
{
$this->trigger('exception', $event);
}
/**
* Raised when a PHP execution error occurs.
*
* An event handler can set the {@link ErrorEvent::handled handled}
* property of the event parameter to be true to indicate no further error
* handling is needed. Otherwise, the {@link getErrorHandler errorHandler}
* application component will continue processing the error.
*
* @param ErrorEvent $event event parameter
*/
public function onError($event)
{
$this->trigger('error', $event);
}
/**
* Displays the captured PHP error.
* This method displays the error in HTML when there is
* no active error handler.
* @param integer $code error code
* @param string $message error message
* @param string $file error file
* @param string $line error line
*/
public function displayError($code, $message, $file, $line)
{
if (YII_DEBUG) {
echo "< h1 > PHP Error [$code]< / h1 > \n";
echo "< p > $message ($file:$line)< / p > \n";
echo '< pre > ';
$trace = debug_backtrace();
// skip the first 3 stacks as they do not tell the error position
if (count($trace) > 3) {
$trace = array_slice($trace, 3);
}
foreach ($trace as $i => $t)
{
if (!isset($t['file'])) {
$t['file'] = 'unknown';
}
if (!isset($t['line'])) {
$t['line'] = 0;
}
if (!isset($t['function'])) {
$t['function'] = 'unknown';
}
echo "#$i {$t['file']}( {$t['line']}): ";
if (isset($t['object']) & & is_object($t['object'])) {
echo get_class($t['object']) . '->';
}
echo " {$t['function']}()\n";
}
echo '< / pre > ';
} else
{
echo "< h1 > PHP Error [$code]< / h1 > \n";
echo "< p > $message< / p > \n";
}
}
/**
* Displays the uncaught PHP exception.
* This method displays the exception in HTML when there is
* no active error handler.
* @param Exception $exception the uncaught exception
*/
public function displayException($exception)
{
if (YII_DEBUG) {
echo '< h1 > ' . get_class($exception) . "< / h1 > \n";
echo '< p > ' . $exception->getMessage() . ' (' . $exception->getFile() . ':' . $exception->getLine() . ')< / p > ';
echo '< pre > ' . $exception->getTraceAsString() . '< / pre > ';
} else
{
echo '< h1 > ' . get_class($exception) . "< / h1 > \n";
echo '< p > ' . $exception->getMessage() . '< / p > ';
}
}
/**
* Initializes the class autoloader and error handlers.
*/
protected function initSystemHandlers()
{
if (YII_ENABLE_EXCEPTION_HANDLER) {
set_exception_handler(array($this, 'handleException'));
}
if (YII_ENABLE_ERROR_HANDLER) {
set_error_handler(array($this, 'handleError'), error_reporting());
}
}
/**
* Registers the core application components.
* @see setComponents
*/
public function registerCoreComponents()
{
$this->setComponents(array(
'errorHandler' => array(
'class' => 'yii\base\ErrorHandler',
),
'request' => array(
'class' => 'yii\base\Request',
),
'response' => array(
'class' => 'yii\base\Request',
),
'format' => array(
'class' => 'yii\base\Formatter',
),
'coreMessages' => array(
'class' => 'yii\i18n\PhpMessageSource',
'language' => 'en_us',
'basePath' => YII_PATH . DIRECTORY_SEPARATOR . 'messages',
),
'messages' => array(
'class' => 'yii\i18n\PhpMessageSource',
),
'securityManager' => array(
'class' => 'yii\base\SecurityManager',
),
'statePersister' => array(
'class' => 'yii\base\StatePersister',
),
));
}
}
