From 18234cc44e6bc989e3e3cf15714c54b4fa05b9dd Mon Sep 17 00:00:00 2001 From: Sachin Joshi Date: Tue, 16 Jul 2019 22:37:36 +0545 Subject: add the rich media ttl based on image exp time --- ...howto_set_richmedia_cache_ttl_based_on_image.md | 32 ++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 docs/config/howto_set_richmedia_cache_ttl_based_on_image.md (limited to 'docs/config') diff --git a/docs/config/howto_set_richmedia_cache_ttl_based_on_image.md b/docs/config/howto_set_richmedia_cache_ttl_based_on_image.md new file mode 100644 index 000000000..489f9ece8 --- /dev/null +++ b/docs/config/howto_set_richmedia_cache_ttl_based_on_image.md @@ -0,0 +1,32 @@ +# How to set rich media cache ttl based on image ttl +## Explanation + +Richmedia are cached without the ttl but the rich media may have image which can expire, like aws signed url. +In such cases the old image url (expired) is returned from the media cache. + +So to avoid such situation we can define a moddule that will set ttl based no image. + +The module must have a `run` function and it should be registered in the config. + +### Example + +```exs +defmodule MyModule do + def run(data, url) do + image_url = Map.get(data, :image) + # do some parsing in the url and get the ttl of the image + # ttl is unix time + ttl = parse_ttl_from_url(image_url) + Cachex.expire_at(:rich_media_cache, url, ttl * 1000) + end +end +``` + +And update the config + +```exs +config :pleroma, :rich_media, + ttl_setters: [Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl, MyModule] +``` + +> For reference there is a parser for AWS signed URL `Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl`, it's enabled by default. -- cgit v1.2.3