Skip to content

Add SWR threshold capability #2

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
rmccue wants to merge 1 commit into
base: add-smart-lifetime
Choose a base branch
from
Open

Add SWR threshold capability #2

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ Smartcache has a variety of filters available. These include:
* `smartcache.is_old_post` - Filter whether a specific post is considered old (infrequently updated). (Default true for posts older than the old threshold.)
* `smartcache.is_new_post` - Filter whether a specific post is considered new (frequently updated). (Default true if published in previous 24 hours.)
* `smartcache.max-age` - Filter the maximum lifetime for the current page directly.
* `smartcache.swr_threshold` - Filter the stale-while-revalidate timeframe. (Default 30s for frequently updated content, 60s for infrequently updated content.)
* `smartcache.should_cache` - Filter whether a page should be cached at all. (Only affects whether Smartcache generates a header, but may be overridden by other behaviour or by the cache itself.)
* `smartcache.urls_to_invalidate_for_post` - Filter which URLs to invalidate for a given post.
* `smartcache.should_invalidate` - Should we invalidate URLs for this post? (Default true, false for new content as it will expire naturally quickly.)
25 changes: 23 additions & 2 deletions inc/namespace.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,16 @@
*/
const LIFETIME_LONG = 1209600;

/**
* Threshold for the SWR (Stale-While-Revalidate) cache.
*/
const SWR_THRESHOLD_LONG = 60;

/**
* Threshold for short SWR (Stale-While-Revalidate) cache.
*/
const SWR_THRESHOLD_SHORT = 30;

/**
* Bootstrap function to set up the plugin.
*
Expand Down Expand Up @@ -155,11 +165,22 @@ function set_cache_ttl() : void {

global $batcache;
$max_age = absint( apply_filters( 'smartcache.max-age', get_default_lifetime() ) );
$swr_time = apply_filters( 'smartcache.swr_threshold', $max_age <= 300 ? SWR_THRESHOLD_SHORT : SWR_THRESHOLD_LONG );
if ( ! $batcache || ! is_object( $batcache ) ) {
header( 'Cache-Control: s-maxage=' . $max_age . ', must-revalidate' );
$value = sprintf(
's-maxage=%d, stale-while-revalidate=%d, must-revalidate',
$max_age,
$swr_time
);
} else {
header( 'Cache-Control: s-maxage=' . $max_age . ', max-age=' . $batcache->max_age . ', must-revalidate' );
$value = sprintf(
's-maxage=%d, max-age=%d, stale-while-revalidate=%d, must-revalidate',
$max_age,
$batcache->max_age,
$swr_time
);
}
header( $value );
}

/**
Expand Down