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Media: Add WP_Image_Editor_Imagick::set_imagick_time_limit() method.

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This aims to avoid timeout in Imagick operations.

Previously, Imagick operations could silently error by timeout and produce unexpected results. The new `::set_imagick_time_limit()` method, now used in `::resize()` and `::crop()`, will better handle garbage collection in these cases as well as better align Imagick's timeout with PHP timeout, assuming it is set.

Props drzraf, audrasjb, costdev, antpb, SergeyBiryukov.
Fixes #52569.
Built from https://develop.svn.wordpress.org/trunk@55404


git-svn-id: http://core.svn.wordpress.org/trunk@54937 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Sergey Biryukov 2023-02-22 14:25:25 +00:00
parent 582feb3ffb
commit 3533ec3159
3 changed files with 51 additions and 1 deletions
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2
wp-admin/includes/class-wp-debug-data.php
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@ -581,6 +581,7 @@ class WP_Debug_Data {
'map' => ( defined( 'imagick::RESOURCETYPE_MAP' ) ? size_format( $imagick->getResourceLimit( imagick::RESOURCETYPE_MAP ) ) : $not_available ),
'memory' => ( defined( 'imagick::RESOURCETYPE_MEMORY' ) ? size_format( $imagick->getResourceLimit( imagick::RESOURCETYPE_MEMORY ) ) : $not_available ),
'thread' => ( defined( 'imagick::RESOURCETYPE_THREAD' ) ? $imagick->getResourceLimit( imagick::RESOURCETYPE_THREAD ) : $not_available ),
'time' => ( defined( 'imagick::RESOURCETYPE_TIME' ) ? $imagick->getResourceLimit( imagick::RESOURCETYPE_TIME ) : $not_available ),
);
$limits_debug = array(
@ -590,6 +591,7 @@ class WP_Debug_Data {
'imagick::RESOURCETYPE_MAP' => ( defined( 'imagick::RESOURCETYPE_MAP' ) ? size_format( $imagick->getResourceLimit( imagick::RESOURCETYPE_MAP ) ) : 'not available' ),
'imagick::RESOURCETYPE_MEMORY' => ( defined( 'imagick::RESOURCETYPE_MEMORY' ) ? size_format( $imagick->getResourceLimit( imagick::RESOURCETYPE_MEMORY ) ) : 'not available' ),
'imagick::RESOURCETYPE_THREAD' => ( defined( 'imagick::RESOURCETYPE_THREAD' ) ? $imagick->getResourceLimit( imagick::RESOURCETYPE_THREAD ) : 'not available' ),
'imagick::RESOURCETYPE_TIME' => ( defined( 'imagick::RESOURCETYPE_TIME' ) ? $imagick->getResourceLimit( imagick::RESOURCETYPE_TIME ) : 'not available' ),
);
$info['wp-media']['fields']['imagick_limits'] = array(

48
wp-includes/class-wp-image-editor-imagick.php
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@ -253,6 +253,50 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
return parent::update_size( $width, $height );
}
/**
* Sets Imagick time limit.
*
* Depending on configuration, Imagick processing may take time.
*
* Multiple problems exist if PHP times out before ImageMagick completed:
* 1. Temporary files aren't cleaned by ImageMagick garbage collection.
* 2. No clear error is provided.
* 3. The cause of such timeout can be hard to pinpoint.
*
* This function, which is expected to be run before heavy image routines, resolves
* point 1 above by aligning Imagick's timeout with PHP's timeout, assuming it is set.
*
* Note:
* - Imagick resource exhaustion does not issue catchable exceptions (yet).
* See https://github.com/Imagick/imagick/issues/333.
* - The resource limit is not saved/restored. It applies to subsequent
* image operations within the time of the HTTP request.
*
* @since 6.2.0
*
* @return int|null The new limit on success, null on failure.
*/
public static function set_imagick_time_limit() {
if ( ! defined( 'Imagick::RESOURCETYPE_TIME' ) ) {
return null;
}
// Returns PHP_FLOAT_MAX if unset.
$imagick_timeout = Imagick::getResourceLimit( Imagick::RESOURCETYPE_TIME );
// Convert to an integer, keeping in mind that: 0 === (int) PHP_FLOAT_MAX.
$imagick_timeout = $imagick_timeout > PHP_INT_MAX ? PHP_INT_MAX : (int) $imagick_timeout;
$php_timeout = (int) ini_get( 'max_execution_time' );
if ( $php_timeout > 1 && $php_timeout < $imagick_timeout ) {
$limit = (float) 0.8 * $php_timeout;
Imagick::setResourceLimit( Imagick::RESOURCETYPE_TIME, $limit );
return $limit;
}
}
/**
* Resizes current image.
*
@ -283,6 +327,8 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
return $this->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h );
}
self::set_imagick_time_limit();
// Execute the resize.
$thumb_result = $this->thumbnail_image( $dst_w, $dst_h );
if ( is_wp_error( $thumb_result ) ) {
@ -549,6 +595,8 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
$src_h -= $src_y;
}
self::set_imagick_time_limit();
try {
$this->image->cropImage( $src_w, $src_h, $src_x, $src_y );
$this->image->setImagePage( $src_w, $src_h, 0, 0 );

2
wp-includes/version.php
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@ -16,7 +16,7 @@
*
* @global string $wp_version
*/
$wp_version = '6.2-beta3-55402';
$wp_version = '6.2-beta3-55404';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.