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Kamel-Media / Kamel

Kotlin asynchronous media loading and caching library for Compose.
Apache License 2.0
592 stars 23 forks source link

Provide custom cache key #80

Open garretyoder opened 6 months ago

garretyoder commented 6 months ago

I was reading through the code but didn't see an example, is it possible to provide a custom key value for the cache to Kamel? If not, can this be a feature request?

In my use case I'm looking to be able to feed it a http url for something that isn't an image and if that url key exists in cache, then load it, if not then I will provide a method that takes that url and returns a url to an actual image for it to go load - but then it needs to be cached under the other URL.

Is it possible to give Kamel a custom cache k/v pair class where I could implement this and get some kind of onNotInCache method where I can return the real img url?

luca992 commented 6 months ago

I think you can make your own mapper to do that, if I understand correctly.

garretyoder commented 6 months ago

I'm looking at https://github.com/Kamel-Media/Kamel/blob/main/kamel-core/src/commonJvmMain/kotlin/io/kamel/core/mapper/JvmMappers.kt as an example and that just looks like the translation of the URL, but no ability to do some background processing when the image does not yet exist in cache unless I'm misunderstanding how it works.

I'm building some website image previews, so I'm looking to be able to feed it a base url (eg; github.com) and if that key exists in cache already, then it will pull the cached image. If not, then I can get a callback of some sort where I can go parse that website to pull out the image I want such as og:image or something similar, and then download that image but cache it under the original base url so I only have to parse website html once.

YuXunSTC commented 1 month ago

https://zqtemp.oss-cn-beijing.aliyuncs.com/wangfou/%E9%98%BF%E5%87%A1%E8%BE%BE-%E6%89%93%E5%85%A5%E6%95%8C%E4%BA%BA%E5%86%85%E9%83%A8.png?Expires=1716017708&OSSAccessKeyId=TMP.3KhCE8dmmQEanAj2LaKPxR6Eb6QE6hAYThZgSTEyM5ATrbGMVgQx5Rc8c31Qp9theDKSoYPwyQ11EhzrV5qedbNx6AmQhR&Signature=utYM9r7kpGEEfR1qMTYJZYhoc%2B4%3D 这是阿里云的oss在设置私有读写之后，都会带着?Expires=1716017708&OSSAccessKeyId=TMP.3KhCE8dmmQEanAj2LaKPxR6Eb6QE6hAYThZgSTEyM5ATrbGMVgQx5Rc8c31Qp9theDKSoYPwyQ11EhzrV5qedbNx6AmQhR&Signature=utYM9r7kpGEEfR1qMTYJZYhoc%2B4%3D 后缀，为了保证我们能够获这个资源我们需要每次都带着后缀，后缀的时间是变化的，所以 kamelImage 每次都会拉取新的图片数据，但是 这张图片的https://zqtemp.oss-cn-beijing.aliyuncs.com/wangfou/%E9%98%BF%E5%87%A1%E8%BE%BE-%E6%89%93%E5%85%A5%E6%95%8C%E4%BA%BA%E5%86%85%E9%83%A8.png 这部分是不变的，这个不变的地址可以作为缓存的key,所以需要一个可以自定义设置缓存Key的功能，请问有这样的功能吗 ，如果没有可以考虑开发吗