Changeset 48160 for trunk/src/wp-admin/includes/file.php

Timestamp:

06/25/2020 07:13:22 AM (3 years ago)

Author:

mikeschroder

Message:

Upgrade/Install: Invalidate OPcache for PHP files during updates.

When files are copied into place, check whether opcode invalidation is available and attempt to invalidate to avoid unintended behavior or fatal errors from themes, plugins, or core.

Introduces wp_opcache_invalidate() to allow safe invalidation of PHP files from opcode cache, and a filter, wp_opcache_invalidate_file to override the behavior.

Replaces the existing calls to opcache_invalidate() in the plugin and theme editors to use the new function.

Thanks to jnylen0 for porting over a patch from ClassicPress that provided much of the approach for what is being committed.

Props nigro.simone, dd32, JasWSInc, szepe.viktor, swissspidy, JanR, asalce, Garavani, pavelevap, pputzer, GregLone, benoitchantre, jadonn, doc987, kraftbj, Krstarica, jnylen0, nextendweb, williampatton, ayeshrajans, joostdevalk, stevenkussmaul, boogah, jorbin, mikeschroder.
Fixes #36455, #50354.

File:

• trunk/src/wp-admin/includes/file.php (modified) (4 diffs)

trunk/src/wp-admin/includes/file.php

@@ -499 +499 @@
         return new WP_Error( 'unable_to_write', __( 'Unable to write to file.' ) );
     }
-    if ( 'php' === $extension && function_exists( 'opcache_invalidate' ) ) {
-        opcache_invalidate( $real_file, true );
-    }
+    wp_opcache_invalidate( $real_file, true );
 
     if ( $is_active && 'php' === $extension ) {
@@ -609 +607 @@
             // Roll-back file change.
             file_put_contents( $real_file, $previous_content );
-            if ( function_exists( 'opcache_invalidate' ) ) {
-                opcache_invalidate( $real_file, true );
-            }
+            wp_opcache_invalidate( $real_file, true );
 
             if ( ! isset( $result['message'] ) ) {
@@ -1744 +1740 @@
                 }
             }
+            wp_opcache_invalidate( $to . $filename );
         } elseif ( 'd' === $fileinfo['type'] ) {
             if ( ! $wp_filesystem->is_dir( $to . $filename ) ) {
@@ -2278 +2275 @@
     <?php
 }
+
+/**
+ * Attempt to clear the opcode cache for an individual PHP file.
+ *
+ * This function can be called safely without having to check the file extension
+ * or availability of the OPcache extension.
+ *
+ * Whether or not invalidation is possible is cached to improve performance.
+ *
+ * @since 5.5
+ *
+ * @link https://www.php.net/manual/en/function.opcache-invalidate.php
+ *
+ * @param string $filepath Path to the file, including extension, for which the opcode cache is to be cleared.
+ * @param bool   $force    Invalidate even if the modification time is not newer than the file in cache. Default `false`.
+ *
+ * @return bool `true` if opcache was invalidated for `$filepath`, or there was nothing to invalidate.
+ *              `false` if opcache invalidation is not available, or is disabled via filter.
+ */
+function wp_opcache_invalidate( $filepath, $force = false ) {
+    static $can_invalidate = null;
+
+    /*
+     * Check to see if WordPress is able to run `opcache_invalidate()` or not, and cache the value.
+     *
+     * First, check to see if the function is available to call, then if the host has restricted
+     * the ability to run the function to avoid a PHP warning.
+     *
+     * `opcache.restrict_api` can specify the path for files allowed to call `opcache_invalidate()`.
+     *
+     * If the host has this set, check whether the path in `opcache.restrict_api` matches
+     * the beginning of the path of the origin file.
+     *
+     * `$_SERVER['SCRIPT_FILENAME']` approximates the origin file's path, but
+     * `realpath()` is necessary because `SCRIPT_FILENAME` can be a relative path
+     * when run from CLI.
+     *
+     * For more details, see:
+     * - https://www.php.net/manual/en/opcache.configuration.php
+     * - https://www.php.net/manual/en/reserved.variables.server.php
+     * - https://core.trac.wordpress.org/ticket/36455
+     */
+    if ( $can_invalidate === null ) {
+        $can_invalidate = function_exists( 'opcache_invalidate' ) &&
+            ( ! ini_get( 'opcache.restrict_api' ) ||
+                stripos( realpath( $_SERVER['SCRIPT_FILENAME'] ), ini_get( 'opcache.restrict_api' ) ) === 0 );
+    }
+
+    // If invalidation is not available, return early.
+    if ( ! $can_invalidate ) {
+        return false;
+    }
+
+    // Verify that file to be invalidated has a PHP extension.
+    if ( ! preg_match( '/\.(?:php)$/i', $filepath ) ) {
+        return false;
+    }
+
+    /**
+     * Filters whether to invalidate a file from the opcode cache.
+     *
+     * @since 5.5
+     *
+     * @param bool   $will_invalidate Whether WordPress will invalidate `$filename`. Default `true`.
+     * @param string $filename        The PHP filename to invalidate.
+     */
+    if ( apply_filters( 'wp_opcache_invalidate_file', true, $filepath ) ) {
+        return opcache_invalidate( $filepath, $force );
+    }
+
+    return false;
+}