Images shown in the browse view are cached.

[mcpierce]

As a reader, I don't want to have to wait for cover images to be redownloaded when browsing a library. The images should be cached on the device and cleared out when no longer needed.

[mcpierce]

This sample for using cache in Ktor was shared on Slack:

import io.ktor.client.*
import io.ktor.client.engine.cio.*
import io.ktor.client.plugins.cache.*
import io.ktor.client.plugins.cache.storage.*
import java.io.File

fun main() {
    val cacheDirectory = File("my_app_cache")
    val client = HttpClient(CIO) {
        install(HttpCache) {
            publicStorage(FileStorage(cacheDirectory)) // Use FileStorage for persistent caching
        }
    }

    // ... make HTTP requests with the client ...
}

[mcpierce]

Also:

import io.ktor.client.engine.darwin.Darwin
import io.ktor.client.engine.darwin.DarwinClientEngineConfig
import io.ktor.client.engine.darwin.KtorNSURLSessionDelegate
import io.ktor.client.HttpClient
import platform.Foundation.NSURLCache
import platform.Foundation.NSURLRequestReloadIgnoringLocalCacheData
import platform.Foundation.NSURLSession
import platform.Foundation.NSURLSessionConfiguration

val client = HttpClient(Darwin) {
    engine {
        val ktorDelegate = KtorNSURLSessionDelegate()
        val sessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration().apply {
            urlCache = NSURLCache.sharedURLCache()
            requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData
        }
        val session = NSURLSession.sessionWithConfiguration(
            configuration = sessionConfiguration,
            delegate = ktorDelegate,
            delegateQueue = null
        )

        // Pass the preconfigured session and delegate to the Ktor engine.
        usePreconfiguredSession(session, ktorDelegate)
    }
}

[mcpierce]

Also check out: https://github.com/vipulasri/kachetor