I wrote a small prototype lua script here for supporting cache invalidation through cache tags -
https://github.com/shukitchan/ats_lua_scripts/blob/master/cache_tags.lua Should be a good starting point. Kit On Fri, Oct 12, 2018 at 12:38 AM Shu Kit Chan <chanshu...@gmail.com> wrote: > I think as long as you allowed it in ip_allow.config properly, "BAN" > method works. > > I think last time the community discussed about this feature, the > conclusion is that you can probably achieve similar effect with the > regex_revalidate plugin - > https://docs.trafficserver.apache.org/en/latest/admin-guide/plugins/regex_revalidate.en.html > or the purge remap plugin - > https://docs.trafficserver.apache.org/en/latest/admin-guide/plugins/remap_purge.en.html > > > I think you should be able to implement the mechanism you mentioned using > lua. Although i am not too sure why you want to update cache.config. Since > i thought the "ban" is just to invalidate the cache entry once and not > indefinitely. > > Thanks > > kit > > > On Thu, Oct 11, 2018 at 9:35 AM Vaughan, Wendre < > wendre.vaug...@soundtransit.org> wrote: > >> I have ATS 7.1 setup as a reverse proxy for a Drupal-Managed Website. My >> Drupal Development Team wants to use a feature called Cache Tags ( >> https://www.drupal.org/docs/8/api/cache-api/cache-tags-varnish ) that is >> designed specifically for Varnish. >> >> >> >> The Drupal system would send a Request with method ‘BAN’ to the ATS >> servers expecting the ATS servers to read the X-Cache-Tags headers (a list >> of pages to not cache) and have ATS do the following: >> >> >> >> 1. Purge the ATS cache of any of the items in the X-Cache-Tags list >> 2. Dynamically update a list of ‘Never Cache’ to the items in the >> X-Cache-Tag list. >> 3. Remove these four headers from origin responses before sending the >> response to the requestor: X-Url, X-Host, X-Cache-Tags, X-Cache-Contexts >> (can do this with the headers plugin) >> >> >> >> So I have a few questions. Can I setup a method called ‘BAN’ on the ATS >> servers? I think I can use the headers plugin and possibly a lua script to >> do the purging and update the cache.config file. If I can get the ‘BAN’ >> method to be accepted by ATS. >> >> >> >> I am pretty new to extending ATS with lua. Any help is appreciated. >> >> >> >> Wendre Vaughan >> >> Senior Software Engineer, Operations | Finance & Information Technology | >> Sound Transit >> >> P: 206.903.7270 | F: 206.398.5223 | e: wendre.vaug...@soundtransit.org >> >> >> >> Connect with us >> >> https://www.facebook.com/SoundTransit | https://twitter.com/SoundTransit >> >> >> >> [image: id:image001.png@01D29738.02F09650] >> >> >> >
