silverstripe-framework/src/Dev/Deprecation.php

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<?php
namespace SilverStripe\Dev;
use SilverStripe\Control\Director;
use SilverStripe\Core\Environment;
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use SilverStripe\Core\Manifest\ClassLoader;
use SilverStripe\Core\Manifest\Module;
use SilverStripe\Core\Manifest\ModuleLoader;
/**
* Handles raising an notice when accessing a deprecated method
*
* A pattern used in SilverStripe when deprecating a method is to add something like
* user_error('This method is deprecated', E_USER_NOTICE);
* to the method
*
* However sometimes we want to mark that a method will be deprecated in some future version and shouldn't be used in
* new code, but not forbid in the current version - for instance when that method is still heavily used in framework
* or cms.
*
* This class abstracts the above pattern and adds a way to do that.
*
* Each call to notice passes a version that the notice will be valid from. Additionally this class has a notion of the
* version it should use when deciding whether to raise the notice. If that version is equal to or greater than the
* notices version (and SilverStripe is in dev mode) a deprecation message will be raised.
*
* Normally the checking version will be the release version of SilverStripe, but a developer can choose to set it to a
* future version, to see how their code will behave in future versions.
*
* Modules can also set the version for calls they make - either setting it to a future version in order to ensure
* forwards compatibility or setting it backwards if a module has not yet removed references to deprecated methods.
*
* When set per-module, only direct calls to deprecated methods from those modules are considered - if the module
* calls a non-module method which then calls a deprecated method, that call will use the global check version, not
* the module specific check version.
*/
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class Deprecation
{
const SCOPE_METHOD = 1;
const SCOPE_CLASS = 2;
const SCOPE_GLOBAL = 4;
/**
*
* @var string
*/
protected static $version;
/**
* Override whether deprecation is enabled. If null, then fallback to
* SS_DEPRECATION_ENABLED, and then true if not defined.
*
* Deprecation is only available on dev.
*
* Must be configured outside of the config API, as deprecation API
* must be available before this to avoid infinite loops.
*
* @var boolean|null
*/
protected static $enabled = null;
/**
*
* @var array
*/
protected static $module_version_overrides = array();
/**
* @var int - the notice level to raise on a deprecation notice. Defaults to E_USER_DEPRECATED if that exists,
* E_USER_NOTICE if not
*/
public static $notice_level = null;
/**
* Set the version that is used to check against the version passed to notice. If the ::notice version is
* greater than or equal to this version, a message will be raised
*
* @static
* @param $ver string -
* A php standard version string, see http://php.net/manual/en/function.version-compare.php for details.
* @param null $forModule string -
* The name of a module. The passed version will be used as the check value for
* calls directly from this module rather than the global value
* @return void
*/
public static function notification_version($ver, $forModule = null)
{
if ($forModule) {
self::$module_version_overrides[$forModule] = $ver;
} else {
self::$version = $ver;
}
}
/**
* Given a backtrace, get the module name from the caller two removed (the caller of the method that called
* #notice)
*
* @param array $backtrace A backtrace as returned from debug_backtrace
* @return Module The module being called
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*/
protected static function get_calling_module_from_trace($backtrace)
{
if (!isset($backtrace[1]['file'])) {
return null;
}
$callingfile = realpath($backtrace[1]['file']);
return ModuleLoader::inst()->getManifest()->getModuleByPath($callingfile);
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}
/**
* Given a backtrace, get the method name from the immediate parent caller (the caller of #notice)
*
* @static
* @param $backtrace array - a backtrace as returned from debug_backtrace
* @param $level - 1 (default) will return immediate caller, 2 will return caller's caller, etc.
* @return string - the name of the method
*/
protected static function get_called_method_from_trace($backtrace, $level = 1)
{
$level = (int)$level;
if (!$level) {
$level = 1;
}
$called = $backtrace[$level];
if (isset($called['class'])) {
return $called['class'] . $called['type'] . $called['function'];
} else {
return $called['function'];
}
}
/**
* Determine if deprecation notices should be displayed
*
* @return bool
*/
public static function get_enabled()
{
// Deprecation is only available on dev
if (!Director::isDev()) {
return false;
}
if (isset(self::$enabled)) {
return self::$enabled;
}
return Environment::getEnv('SS_DEPRECATION_ENABLED') ?: true;
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}
/**
* Toggle on or off deprecation notices. Will be ignored in live.
*
* @param bool $enabled
*/
public static function set_enabled($enabled)
{
self::$enabled = $enabled;
}
/**
* Raise a notice indicating the method is deprecated if the version passed as the second argument is greater
* than or equal to the check version set via ::notification_version
*
* @param string $atVersion The version at which this notice should start being raised
* @param string $string The notice to raise
* @param int $scope Notice relates to the method or class context its called in.
*/
public static function notice($atVersion, $string = '', $scope = Deprecation::SCOPE_METHOD)
{
if (!static::get_enabled()) {
return;
}
$checkVersion = self::$version;
// Getting a backtrace is slow, so we only do it if we need it
$backtrace = null;
// If you pass #.#, assume #.#.0
if (preg_match('/^[0-9]+\.[0-9]+$/', $atVersion)) {
$atVersion .= '.0';
}
if (preg_match('/^[0-9]+\.[0-9]+$/', $checkVersion)) {
$checkVersion .= '.0';
}
if (self::$module_version_overrides) {
$module = self::get_calling_module_from_trace($backtrace = debug_backtrace(0));
if ($module) {
if (($name = $module->getComposerName())
&& isset(self::$module_version_overrides[$name])
) {
$checkVersion = self::$module_version_overrides[$name];
} elseif (($name = $module->getShortName())
&& isset(self::$module_version_overrides[$name])
) {
$checkVersion = self::$module_version_overrides[$name];
}
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}
}
// Check the version against the notice version
if ($checkVersion && version_compare($checkVersion, $atVersion, '>=')) {
// Get the calling scope
if ($scope == Deprecation::SCOPE_METHOD) {
if (!$backtrace) {
$backtrace = debug_backtrace(0);
}
$caller = self::get_called_method_from_trace($backtrace);
} elseif ($scope == Deprecation::SCOPE_CLASS) {
if (!$backtrace) {
$backtrace = debug_backtrace(0);
}
$caller = isset($backtrace[1]['class']) ? $backtrace[1]['class'] : '(unknown)';
} else {
$caller = false;
}
// Get the level to raise the notice as
$level = self::$notice_level;
if (!$level) {
$level = E_USER_DEPRECATED;
}
// Then raise the notice
if (substr($string, -1) != '.') {
$string .= ".";
}
$string .= " Called from " . self::get_called_method_from_trace($backtrace, 2) . '.';
if ($caller) {
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user_error($caller . ' is deprecated.' . ($string ? ' ' . $string : ''), $level);
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} else {
user_error($string, $level);
}
}
}
/**
* Method for when testing. Dump all the current version settings to a variable for later passing to restore
*
* @return array Opaque array that should only be used to pass to {@see Deprecation::restore_settings()}
*/
public static function dump_settings()
{
return array(
'level' => self::$notice_level,
'version' => self::$version,
'moduleVersions' => self::$module_version_overrides,
'enabled' => self::$enabled,
);
}
/**
* Method for when testing. Restore all the current version settings from a variable
*
* @param $settings array An array as returned by {@see Deprecation::dump_settings()}
*/
public static function restore_settings($settings)
{
self::$notice_level = $settings['level'];
self::$version = $settings['version'];
self::$module_version_overrides = $settings['moduleVersions'];
self::$enabled = $settings['enabled'];
}
}