Drupal Module Advanced application authcache-dynamic loading content Tutorial

Related article: Drupal module explain-authcache caching principle detailed tutorial

This article is about how to implement the personalized content of a cached page if you modify Authcache's core code.

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Common cache, more or less to be personalized processing, such as user name display, dynamic loading of user information, user friends and so on.

In general, this kind of local personalization is accomplished by two means: one is SSI and the other is CSI.

Authcache itself can implement local personalization, module called p13n.

The Authcache Ajax module belongs to the Csi,esi module and should be SSI, but because the ESI module needs to build the varnish server, configuring VCL, plus Server setup issues, can cause ESI error, and its own ESI pass cookies can also be problematic, Therefore, ESI is actually quite complex to implement.

Therefore, if we want to use the server-side personalization, modify some of the content with the PHP modification according to certain conditions, we need to hack some authcache code.
1. Autcache.module Documents

Find the following line 188
Invoke Cache backends and serve page.
Modified as follows:

The code is as follows

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Invoke Cache backends and serve page. if (authcache_page_is_cacheable ()) { $cache = Authcache_backend_cache_save (); Authcache_serve_page_from_cache ($cache, Authcache_key ()); } else { Process HTML Result Global $conf; $conf [' page_compression '] = FALSE; $cache = new StdClass (); Process HTML Result $cache->data[' body '] = ob_get_contents (); Ob_clean (); foreach (Variable_get (' authcache_page_process ', Array ()) as $include) { Require_once Drupal_root. '/' . $include; } foreach (Variable_get (' Authcache_page_process_interface ', Array ()) as $process) { Require_once Drupal_root. '/' . $include; if (is_callable ($process)) { $process ($cache); } } echo $cache->data[' body ']; } Exit }

Among them, the main is added else after the processing code.
2. Authcache.cache.inc Documents

Start with 85 lines, to the end of the function, and modify to the following format.

The code is as follows

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$return _compressed = FALSE; NEW//don ' t send compressed content if ($page _compression) { Header (' vary:accept-encoding ', FALSE); If page_compression is enabled, the cache contains gzipped data. if ($return _compressed) { $cache->data[' body '] is already gzip ' Ed, so make sure Zlib.output_compression does not compress it once more. Ini_set (' zlib.output_compression ', ' 0 '); Header (' Content-encoding:gzip '); } else { The client does not support compression, so unzip the "data in the" Cache. Strip the gzip header and run uncompress. $cache->data[' body '] = gzinflate (substr (substr ($cache->data[' body '), 10), 0,-8); } } NEW foreach (Variable_get (' authcache_page_process ', Array ()) as $include) { Require_once Drupal_root. '/' . $include; } foreach (Variable_get (' Authcache_page_process_interface ', Array ()) as $process) { if (is_callable ($process)) { $process ($cache); } }

Note that there are two places where the///new callout indicates the new addition, and the middle section is the original code.

After we have finished, we will be finished.
How to use it?

Create a new file, such as under the custom module, called Custom_authcache.inc, and paste the following code:

The code is as follows

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<?php /** Add The following lines to settings.php   $conf [' authcache_page_process '] = ' sites/all/modules/ Custom/custom/custom_authcache.inc '; $conf [' authcache_page_process_interface '] [] = ' custom_authcache_common_process ';   If You are want to add more process interface, add your function name as a item in this array, $conf [' AUTHCAC He_page_process_interface ']. If you are want to include file, please add the file name to this array, $conf [' authcache_page_process ']   Core Changes: modules/authcache/authcache.cache.inc modules/authcache/authcache.module **/   /* * Process authcache content to replace content */ Function custom_authcache_common_process (& $cache) {   $cache->data[' body '] = str_ireplace (' <span id= ' replace_placeholder_1 '/> ', _get_real_data (), $cache- >data[' body ']); }

Look at the comments above to copy two lines of code to the settings.php file. The
specific note notes are very detailed, I believe it should be no problem.

In this way, the Custom_authcache_common_process function can dynamically replace the contents of the HTML and achieve the purpose of personalizing the page.