Commit Graph

32 Commits

Author SHA1 Message Date
Sam Saffron ed00f35306 FEATURE: improve performance of anonymous cache
This commit introduces 2 features:

1. DISCOURSE_COMPRESS_ANON_CACHE (true|false, default false): this allows
you to optionally compress the anon cache body entries in Redis, can be
useful for high load sites with Redis that lives on a separate server to
to webs

2. DISCOURSE_ANON_CACHE_STORE_THRESHOLD (default 2), only pop entries into
redis if we observe them more than N times. This avoids situations where
a crawler can walk a big pile of topics and store them all in Redis never
to be used. Our default anon cache time for topics is only 60 seconds. Anon
cache is in place to avoid the "slashdot" effect where a single topic is
hit by 100s of people in one minute.
2019-09-04 17:18:32 +10:00
Sam Saffron b9954b53bb FIX: report cached controller and action to loggers
Previously we would treat all cached hits in anon cache as "other"

This hinders analysis of cache performance and makes logging inaccurate
2019-09-03 10:55:16 +10:00
Sam Saffron 08743e8ac0 FEATURE: anon cache reports data to loggers
This allows custom plugins such as prometheus exporter to log how many
requests are stored in the anon cache vs used by the anon cache.

This metric allows us to fine tune cache behaviors
2019-09-02 18:45:35 +10:00
Régis Hanol 75eebc904e FEATURE: new 'Discourse-Render' HTTP header 2019-08-30 20:45:18 +02:00
Maja Komel 42809f4d69 FIX: use crawler layout when saving url in Wayback Machine (#7667) 2019-06-03 12:13:32 +10:00
Penar Musaraj a4eb523af6 Track Discourse user agent pageviews as crawler
Since 5bfe051e, Discourse user agents are marked as non-crawlers (to avoid accidental blacklisting). This makes sure pageviews for these agents are tracked as crawler hits.
2019-05-08 10:38:55 -04:00
Neil Lalonde 526ffc4966 FIX: error in response body to blocked crawlers, showing 500 Internal Server Error with status of 403 2018-09-14 15:40:20 -04:00
Neil Lalonde b87a089822 FIX: don't block api requests when whitelisted_crawler_user_agents is set 2018-09-14 15:40:20 -04:00
Osama Sayegh 0b7ed8ffaf FEATURE: backend support for user-selectable components
* FEATURE: backend support for user-selectable components

* fix problems with previewing default theme

* rename preview_key => preview_theme_id

* omit default theme from child themes dropdown and try a different fix

* cache & freeze stylesheets arrays
2018-08-08 14:46:34 +10:00
Sam 379384ae1e FIX: never block /srv/status which is used for health checks
This route is also very cheap so blocking it is not required

It is still rate limited and so on elsewhere
2018-07-18 12:37:01 +10:00
OsamaSayegh decf1f27cf FEATURE: Groundwork for user-selectable theme components
* Phase 0 for user-selectable theme components

- Drops `key` column from the `themes` table
- Drops `theme_key` column from the `user_options` table
- Adds `theme_ids` (array of ints default []) column to the `user_options` table and migrates data from `theme_key` to the new column.
- Removes the `default_theme_key` site setting and adds `default_theme_id` instead.
- Replaces `theme_key` cookie with a new one called `theme_ids`
- no longer need Theme.settings_for_client
2018-07-12 14:18:21 +10:00
Sam e72fd7ae4e FIX: move crawler blocking into anon cache
This refinement of previous fix moves the crawler blocking into
anonymous cache

This ensures we never poison the cache incorrectly when blocking crawlers
2018-07-04 11:14:43 +10:00
Sam 035312d501 FIX: specify path for dosp cookie 2018-04-24 11:07:58 -04:00
Sam ded84a4b58 PERF: improve performance once logged in rate limiter hits
If "logged in" is being forced anonymous on certain routes, trigger
the protection for any requests that spend 50ms queueing

This means that ...

1. You need to trip it by having 3 requests take longer than 1 second in 10 second interval
2. Once tripped, if your route is still spending 50m queueuing it will continue to be protected

This means that site will continue to function with almost no delays while it is scaling up to handle the new load
2018-04-23 11:55:25 +10:00
Sam 59cd7894d9 FEATURE: if site is under extreme load show anon view
If a particular path is being hit extremely hard by logged on users,
revert to anonymous cached view.

This will only come into effect if 3 requests queue for longer than 2 seconds
on a *single* path.

This can happen if a URL is shared with the entire forum base and everyone
is logged on
2018-04-18 16:58:57 +10:00
Guo Xiang Tan 5012d46cbd Add rubocop to our build. (#5004) 2017-07-28 10:20:09 +09:00
Sam bdb848b4f3 Split the theme_key so we extract the key from seq 2017-06-15 14:09:44 -04:00
Sam ac1f84d3e1 SECURITY: theme key should be an anon cache breaker 2017-06-15 09:36:27 -04:00
Sam 39a524aac8 FEATURE: brotli cdn bypass for assets
Allow CDNS that strip out brotli encoding to use brotli regardless
2016-12-05 13:57:09 +11:00
Robin Ward a9823ab59a FIX: Use a cookie to bypass the anon cache 2015-10-28 17:16:56 -04:00
Sam 1f9761e85d FEATURE: add a header to denote an anonymous req was cached
(X-Discourse-Cached)
2015-06-16 10:30:06 +10:00
Sam 08b790b3c2 improve metrics gathered using in our traffic section
this also pulls out the middleware into its own home and inserts in front
2015-02-05 16:08:52 +11:00
Sam 8690c7c49f defer counting to avoid race condition 2015-02-05 12:19:21 +11:00
Sam c150c55e2d FEATURE: rudimentary view tracking wired in 2015-02-04 16:15:16 +11:00
Sam 4f8dfd84b9 FIX: vary accept for cache, seems most correct 2014-09-09 10:25:49 +10:00
Sam 8646c21e89 FIX: anonymous cache could cache json for html requests 2014-09-09 09:46:26 +10:00
Akshay 6301a43d57 Not initializing variable for looping if unused in loop 2014-08-15 03:24:55 +05:30
Sam 35952055e2 BUGFIX: web crawlers messing with anon caching 2014-04-29 10:48:09 +10:00
Sam adc9a58f4a BUGFIX: anon cache was mucking with params 2014-01-09 16:49:12 +11:00
Sam 74c1555885 BUGFIX: fix broken spec 2014-01-09 15:11:04 +11:00
Sam 177983afe6 BUGFIX: mobile ui was being cached for anon views 2014-01-09 14:08:42 +11:00
Sam 3d647a4b41 remove rack cache, it has been causing trouble
instead implement an aggressive anonymous cache that is stored in redis
this cache is sitting in the front of the middleware stack enabled only in production
TODO: expire it more intelligently when stuff is created
2013-10-16 16:39:18 +11:00