33 lines
992 B
Markdown
33 lines
992 B
Markdown
# How to set rich media cache ttl based on image ttl
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## Explanation
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Richmedia are cached without the ttl but the rich media may have image which can expire, like aws signed url.
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In such cases the old image url (expired) is returned from the media cache.
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So to avoid such situation we can define a moddule that will set ttl based no image.
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The module must have a `run` function and it should be registered in the config.
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### Example
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```exs
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defmodule MyModule do
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def run(data, url) do
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image_url = Map.get(data, :image)
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# do some parsing in the url and get the ttl of the image
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# ttl is unix time
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ttl = parse_ttl_from_url(image_url)
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Cachex.expire_at(:rich_media_cache, url, ttl * 1000)
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end
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end
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```
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And update the config
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```exs
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config :pleroma, :rich_media,
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ttl_setters: [Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl, MyModule]
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```
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> For reference there is a parser for AWS signed URL `Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl`, it's enabled by default.
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