Move forward with Tiny cache + clean post

mu-cache-flush-button/flush-cache-button.php

@@ -1,6 +1,6 @@
 <?php
 /*
-Plugin Name: Fluch cache button (MU)
+Plugin Name: Flush cache button (MU)
 Version: 0.1.1
 Description: Add an admin bar button to flush the object cache.
 Author: Viktor Szépe

mu-cache-flush-post-button/clean-post-cache-button.php

@@ -0,0 +1,41 @@
+<?php
+/*
+Plugin Name: Clean post cache button (MU)
+Version: 0.1.0
+Description: Add a post row action to clean the post from the object cache.
+Author: Viktor Szépe
+Plugin URI: https://github.com/szepeviktor/wordpress-plugin-construction
+GitHub Plugin URI: https://github.com/szepeviktor/wordpress-plugin-construction
+*/
+
+add_filter( 'post_row_actions', function ( $actions, $post ) {
+    $post_list_url = admin_url( add_query_arg( array(
+        'post_type' => $post->post_type,
+        'clean_post' => $post->ID,
+    ), 'edit.php' ) );
+
+    $actions['clean_post'] = sprintf( '<a class="clean" href="%s">%s</a>',
+        wp_nonce_url( $post_list_url, 'clean_post' ),
+        __( 'Clean', 'clean-post' )
+    );
+
+    return $actions;
+}, 11, 2 );
+
+add_action( 'admin_init', function () {
+    if ( ! isset( $_GET['clean_post'] ) ) {
+        return;
+    }
+
+    check_admin_referer( 'clean_post' );
+
+    // Clean
+    $post_id = (int) $_GET['clean_post'];
+    if ( false !== get_post_status( $post_id ) ) {
+        clean_post_cache( $post_id );
+    }
+
+    add_action( 'admin_notices', function () {
+        echo '<div class="notice notice-success is-dismissible"><p>Post cleaned from Object Cache.</p></div>';
+    } );
+} );

tiny-cache.php

@@ -2,7 +2,7 @@
 /*
 Plugin name: Tiny cache (MU)
 Description: Cache HTML in persistent object cache during the_content() calls.
-Version: 0.3.1
+Version: 0.4.0
 Plugin URI: https://developer.wordpress.org/reference/functions/the_content/
 */
 
@@ -16,14 +16,20 @@
     the_content();
     endif;
 
+    if ( function_exists( 'get_the_content_cached' ) ) :
+    get_the_content_cached();
+    else :
+    get_the_content();
+    endif;
+
 Replace the_content(); instances
 --------------------------------
 
     $ find -type f -name "*.php" | xargs -r -L 1 sed -i -e 's|\bthe_content();|the_content_cached();|g'
 */
 
 /**
- * Serve cached content or generate and save the content to the object cache.
+ * Display content from the object cache.
  */
 function the_content_cached( $more_link_text = null, $strip_teaser = false ) {
 
@@ -72,6 +78,54 @@ function the_content_cached( $more_link_text = null, $strip_teaser = false ) {
     }
 }
 
+/**
+ * Retrieve content from the object cache.
+ */
+function get_the_content_cached( $more_link_text = null, $strip_teaser = false ) {
+
+    $post_id = get_the_ID();
+    // Learned from W3TC Page Cache rules and WP Super Cache rules
+    if ( ! wp_using_ext_object_cache() // Object cache is unavailable
+        || is_user_logged_in() // User is logged in
+        || ! ( isset( $_SERVER['REQUEST_METHOD'] ) && 'GET' === $_SERVER['REQUEST_METHOD'] ) // Not a GET request
+        || ! $post_id // Not possible to tie content to post ID
+        || ! ( defined( 'DONOTCACHEPAGE' ) && DONOTCACHEPAGE ) // DO-NOT-CACHE tag present
+    ) {
+        return get_the_content( $more_link_text, $strip_teaser );
+    }
+
+    $found = null;
+    // @TODO Support groups: wp_cache_add_global_groups( 'get_the_content' ) and WP_REDIS_USE_CACHE_GROUPS
+    $cached = wp_cache_get( $post_id, 'get_the_content', false, $found );
+
+    // Cache hit
+    if ( $found ) {
+        return $cached;
+    }
+
+    // Cache miss
+    $save_to_cache = false;
+    $post = get_post( $post_id );
+    // Public post
+    if ( true === is_object( $post ) ) {
+        if ( 'publish' === $post->post_status && empty( $post->post_password ) ) {
+            $save_to_cache = true;
+        }
+    }
+
+    // @TODO Add $more_link_text and $strip_teaser hash to cache key.
+    $content = get_the_content( $more_link_text, $strip_teaser );
+    if ( true === $save_to_cache ) {
+        $message_tpl = '<!-- Cached content generated by Tiny cache on %s -->';
+        $timestamp = gmdate( 'c' );
+        $message = sprintf( $message_tpl, esc_html( $timestamp ) );
+        wp_cache_set( $post_id, $content . $message, 'get_the_content' );
+    }
+
+    return $content;
+}
+
+
 /**
  * Save the content to the object cache.
  */