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Helen Hou-Sandí 5f6b531f70 Improve oEmbed caching. Introduces the concept of a TTL for oEmbed caches and a filter for `oembed_ttl`. 
We will no longer replace previously valid oEmbed responses with an `{{unknown}}` cache value. When this happens due to reaching a rate limit or a service going down, it is data loss, and is not acceptable. This means that oEmbed caches for a post are no longer deleted indiscriminately every time that post is saved.

oEmbed continues to be cached in post meta, with the addition of a separate meta key containing the timestamp of the last retrieval, which is used to avoid re-requesting a recently cached oEmbed response. By default, we consider a valued cached in the past day to be fresh. This can greatly reduce the number of outbound requests, especially in cases where a post containing multiple embeds is saved frequently.

The TTL used to determine whether or not to request a response can be filtered using `oembed_ttl`, thus allowing for the possibility of respecting the optional oEmbed response parameter `cache_age` or altering the period of time a cached value is considered to be fresh.

Now that oEmbeds are previewed in the visual editor as well as the media modal, oEmbed caches are often populated before a post is saved or published. By pre-populating and avoiding having to re-request that response, we also greatly reduce the chances of a stampede happening when a published post is visible before oEmbed caching is complete.

As it previously stood, a stampede was extremely likely to happen, as the AJAX caching was only triggered when `$_GET['message']` was 1. The published message is 6. We now trigger the caching every time `$_GET['message']` is present on the edit screen, as we are able to avoid triggering so many HTTP requests overall.

props markjaquith. fixes #14759. see #17210.

Built from https://develop.svn.wordpress.org/trunk@28972


git-svn-id: http://core.svn.wordpress.org/trunk@28761 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 		2014-07-03 16:45:14 +00:00
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css Only apply metabox handle styles and JS events to `.postbox .hndle`, as opposed to all `h3`s in a `.postbox`. 2014-07-01 16:23:15 +00:00
images Convert the post lock icon to a dashicon. 2014-03-04 06:53:14 +00:00
includes Improve oEmbed caching. Introduces the concept of a TTL for oEmbed caches and a filter for `oembed_ttl`. 2014-07-03 16:45:14 +00:00
js Only apply metabox handle styles and JS events to `.postbox .hndle`, as opposed to all `h3`s in a `.postbox`. 2014-07-01 16:23:15 +00:00
maint Remove the WordPress logo from the focusable elements on the install/update screens. Fixes #28674. Props stompweb 2014-06-29 14:10:15 +00:00
network Add new action 'delete_user_form' in `wp-admin/users.php` and `wp-admin/network/users.php`. 2014-06-28 04:43:16 +00:00
user Add missing Dashicons classes to User Admin menu. 2014-05-06 07:58:15 +00:00
about.php The About page has a `<div>` that doesn't close. Also, `<hr>`s should self-close. `hackificator` complains about these things. 2014-05-18 20:33:15 +00:00
admin-ajax.php Don't pass embeds through `the_content()` when trying to render MCE previews, leverage `WP_Embed` and `do_shortcode()` instead. 2014-05-26 23:43:15 +00:00
admin-footer.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
admin-functions.php First there were two, and now there are three -- in the @since versions that came before and that shall be. And so it will be, says nacin. 2013-12-24 18:57:12 +00:00
admin-header.php Correct misleading verbiage in 'print' hook docs. 2014-03-25 08:05:15 +00:00
admin-post.php Because the `WP_ADMIN` constant name can be bound in multiple files, all instances should check `! defined` first. `wp-admin/admin.php` already has this check. 2014-05-18 20:42:16 +00:00
admin.php Because the `WP_ADMIN` constant name can be bound in multiple files, all instances should check `! defined` first. `wp-admin/admin.php` already has this check. 2014-05-18 20:42:16 +00:00
async-upload.php `hackificator` complains if you call `include 'file.php'` without the parens, needs to be `include( 'file.php' )` 2014-05-18 20:52:15 +00:00
comment.php `hackificator` bails on this file because of mixed quote styles on some HTML attributes. 2014-05-18 21:47:14 +00:00
credits.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
custom-background.php Classes that have `__set()` also need `__isset()` and `__unset()`. 2014-05-19 06:52:14 +00:00
custom-header.php Classes that have `__set()` also need `__isset()` and `__unset()`. 2014-05-19 06:52:14 +00:00
customize.php Customizer: Introduce a "panel" API to organize multiple sections into a one section. 2014-06-26 20:17:15 +00:00
edit-comments.php Comments: Update border color and help text. 2014-03-27 05:08:14 +00:00
edit-form-advanced.php In `media_buttons()`, add a static var `$instance` to increment the `id` attribute of `insert-media-button-%d` on each call. 2014-06-26 01:05:14 +00:00
edit-form-comment.php `hackificator` doesn't like mixed quote styles in some generated HTML. The switch from single to double allows these files to be parsed. 2014-05-19 01:59:15 +00:00
edit-link-form.php In `edit-link-form.php`, `hackificator` bails because there is a `</form>` with no open `<form>`. It exists, but is needlessly constructed with PHP. It always returns a `<form>`, only the `id` and `name` are different. The dynamic piece just returns the ID now. 2014-05-18 22:07:15 +00:00
edit-tag-form.php Remove all "valign" attributes from tables in wp-admin, props MikeHansenMe, Marventus. Fixes #22712. 2014-01-24 19:06:15 +00:00
edit-tags.php Remove unreachable `break` statements in `wp-admin/edit-tags.php`. `break` is unnecessary after `die`, `exit`, and `wp_die`. 2014-05-06 14:52:16 +00:00
edit.php `edit.php?post_type=attachment` should redirect to `upload.php`. Without the redirect, the user is presented with an empty list table. There are probably other issues to address overall, but this accomplishes what the ticket wants. 2014-06-10 18:48:15 +00:00
export.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
freedoms.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
import.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
index.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
install-helper.php Remove all `@package` and `@subpackage` PHPDoc tags not at the file- or class-levels in core. 2014-02-25 17:14:14 +00:00
install.php Admin screens should use the `WPINC` constant 2014-06-29 22:21:15 +00:00
link-add.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
link-manager.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
link-parse-opml.php Remove unused globals from `link-parse-opml.php` after [28743]. 2014-06-20 17:26:14 +00:00
link.php In `wp-admin/link.php`, `break` is unreachabled after `exit`. 2014-05-06 18:06:14 +00:00
load-scripts.php Unique load array in load-scripts and load-styles. 2013-07-29 17:57:04 +00:00
load-styles.php Admin screens should use the `WPINC` constant 2014-06-29 22:21:15 +00:00
media-new.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
media-upload.php Inline documentation for hooks in wp-admin/media-upload.php. 2014-01-08 04:00:11 +00:00
media.php Cleanup for `switch` statements: 2014-05-30 17:58:15 +00:00
menu-header.php Restore the ability to pass classes to admin menu submenu items, important for the Customize link. Accidentally left out in [24048]. fixes #28583. 2014-06-19 02:18:15 +00:00
menu.php Introduce a `.dashicons-before` CSS class. 2014-03-05 20:04:14 +00:00
moderation.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-admin.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-delete-site.php Always decode special characters for email subjects. 2014-03-28 02:44:15 +00:00
ms-edit.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-options.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-sites.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-themes.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-upgrade-network.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
ms-users.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
my-sites.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
nav-menus.php Use '&mdash; Select &mdash;' instead of '-- Select --' for nav menus. Looks nicer. 2014-04-25 00:35:25 +00:00
network.php Admin screens should use the `WPINC` constant 2014-06-29 22:21:15 +00:00
options-discussion.php Priority fixes for various existing hook documentation. 2014-04-12 00:01:15 +00:00
options-general.php Replace Y/m/d date format in general settings with a more popular one, Y-m-d. 2014-06-26 14:29:17 +00:00
options-head.php Use wp_unslash() instead of stripslashes() and stripslashes_deep(). Use wp_slash() instead of add_magic_quotes(). 2013-03-01 17:14:09 +00:00
options-media.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
options-permalink.php Permalink Settings: Don't show "update your .htaccess now" if nothing needs to change. 2014-03-15 04:35:16 +00:00
options-reading.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
options-writing.php Priority fixes for various existing hook documentation. 2014-04-12 00:01:15 +00:00
options.php Add braces missed while adding docs for the `option_page_capability_{$option_page}` hook. 2014-06-25 21:48:15 +00:00
plugin-editor.php In `wp-admin/plugin-editor.php`, `break` is unreachabled after `exit`. 2014-05-06 18:12:14 +00:00
plugin-install.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
plugins.php Plugin activation/deletion errors should be styled as such. 2014-05-31 20:10:15 +00:00
post-new.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
post.php In `wp-admin/post.php`, `break` is unreachabled after `exit`. 2014-05-06 18:15:15 +00:00
press-this.php Make sure inputs in Press This have a type so they are styled appropriately. see #18380. 2014-03-27 02:39:14 +00:00
profile.php Don't rely on include_path to include files. 2013-09-25 00:18:11 +00:00
revision.php Fix some `hackificator` odds and ends in `wp-admin`: 2014-05-19 05:04:16 +00:00
setup-config.php Admin screens should use the `WPINC` constant 2014-06-29 22:21:15 +00:00
theme-editor.php Fix some `hackificator` odds and ends in `wp-admin`: 2014-05-19 05:04:16 +00:00
theme-install.php Update help text on Add Themes screen. 2014-05-17 23:44:15 +00:00
themes.php Show a "No themes found" message if the search for an installed theme doesn't produce any results. 2014-06-29 09:16:14 +00:00
tools.php Use SSL when linking to WordPress.org. see #27115. 2014-03-08 04:14:15 +00:00
update-core.php `hackificator` doesn't like mixed single/double-quoted attributes. These were 2 lingering instances in the admin. 2014-05-19 17:10:15 +00:00
update.php Fix some `hackificator` odds and ends in `wp-admin`: 2014-05-19 05:04:16 +00:00
upgrade-functions.php First there were two, and now there are three -- in the @since versions that came before and that shall be. And so it will be, says nacin. 2013-12-24 18:57:12 +00:00
upgrade.php Remove the WordPress logo from the focusable elements on the install/update screens. Fixes #28674. Props stompweb 2014-06-29 14:10:15 +00:00
upload.php Grid view for the media library, first pass. This is alpha; expect imperfection. We will be iterating further. 2014-06-05 22:01:18 +00:00
user-edit.php `hackificator` complains if you call `include 'file.php'` without the parens, needs to be `include( 'file.php' )` 2014-05-18 20:52:15 +00:00
user-new.php Don't use variable variables in `user-new.php`. Test by causing errors when creating a new user. 2014-06-11 19:54:13 +00:00
users.php Add new action 'delete_user_form' in `wp-admin/users.php` and `wp-admin/network/users.php`. 2014-06-28 04:43:16 +00:00
widgets.php The `sidebar_admin_setup` hook should only be documented once in wp-admin/widgets.php. All others are duplicates. 2014-03-28 19:47:15 +00:00