[General] Images offline cache

electron/constants.ts

@@ -55,6 +55,7 @@ const userInfo = join(legendaryConfigPath, 'user.json')
 const heroicInstallPath = join(homedir(), 'Games', 'Heroic')
 const heroicDefaultWinePrefix = join(homedir(), 'Games', 'Heroic', 'Prefixes')
 const heroicAnticheatDataPath = join(heroicFolder, 'areweanticheatyet.json')
+const imagesCachePath = join(heroicFolder, 'images-cache')
 
 const { currentLogFile: currentLogFile, lastLogFile: lastLogFile } =
   createNewLogFileAndClearOldOnces()
@@ -194,6 +195,7 @@ export {
   heroicToolsPath,
   heroicDefaultWinePrefix,
   heroicAnticheatDataPath,
+  imagesCachePath,
   userHome,
   flatPakHome,
   kofiPage,

electron/images_cache.ts

@@ -0,0 +1,34 @@
+import { existsSync, createWriteStream, mkdirSync } from 'graceful-fs'
+import { createHash } from 'crypto'
+import { imagesCachePath } from './constants'
+import { join } from 'path'
+import axios from 'axios'
+import { protocol } from 'electron'
+
+export const initImagesCache = () => {
+  // make sure we have a folder to store the cache
+  if (!existsSync(imagesCachePath)) {
+    mkdirSync(imagesCachePath)
+  }
+
+  // use a fake protocol for images we want to cache
+  protocol.registerFileProtocol('imagecache', (request, callback) => {
+    callback({ path: getImageFromCache(request.url) })
+  })
+}
+
+const getImageFromCache = (url: string) => {
+  const realUrl = url.replace('imagecache://', '')
+  // digest of the image url for the file name
+  const digest = createHash('sha256').update(realUrl).digest('hex')
+  const cachePath = join(imagesCachePath, digest)
+
+  if (!existsSync(cachePath)) {
+    // if not found, download in the background
+    axios
+      .get(realUrl, { responseType: 'stream' })
+      .then((response) => response.data.pipe(createWriteStream(cachePath)))
+  }
+
+  return join(cachePath)
+}

electron/main.ts

@@ -1,3 +1,4 @@
+import { initImagesCache } from './images_cache'
 import { downloadAntiCheatData } from './anticheat/utils'
 import {
   InstallParams,
@@ -328,6 +329,8 @@ if (!gotTheLock) {
   app.whenReady().then(async () => {
     const systemInfo = await getSystemInfo()
 
+    initImagesCache()
+
     logInfo(
       ['Legendary location:', join(...Object.values(getLegendaryBin()))],
       LogPrefix.Legendary

src/components/UI/CachedImage/index.tsx

@@ -0,0 +1,33 @@
+import React, { useState } from 'react'
+
+interface CachedImageProps {
+  src: string
+  fallback?: string
+}
+
+type Props = React.ImgHTMLAttributes<HTMLImageElement> & CachedImageProps
+
+const CachedImage = (props: Props) => {
+  const [useCache, setUseCache] = useState(true)
+  const [useFallback, setUseFallback] = useState(false)
+
+  const onError = () => {
+    // if not cached, tried with the real
+    if (useCache) {
+      setUseCache(false)
+    } else {
+      // if not cached and can't access real, try with the fallback
+      if (props.fallback) {
+        setUseFallback(true)
+        setUseCache(true)
+      }
+    }
+  }
+
+  let src = useFallback ? props.fallback : props.src
+  src = useCache ? `imagecache://${src}` : src
+
+  return <img {...props} src={src} onError={onError} />
+}
+
+export default CachedImage

src/components/UI/index.tsx

@@ -10,3 +10,4 @@ export { default as ToggleSwitch } from './ToggleSwitch'
 export { default as UpdateComponent } from './UpdateComponent'
 export { default as SvgButton } from './SvgButton'
 export { default as ControllerHints } from './ControllerHints'
+export { default as CachedImage } from './CachedImage'

src/screens/Game/GamePicture/index.tsx

@@ -1,6 +1,9 @@
 import React from 'react'
+import { CachedImage } from 'src/components/UI'
+
 import './index.css'
 import fallbackImage from 'src/assets/fallback-image.jpg'
+
 type Props = {
   art_square: string
   store: string
@@ -10,15 +13,25 @@ function GamePicture({ art_square, store }: Props) {
   function getImageFormatting() {
     if (art_square === 'fallback') return fallbackImage
     if (store === 'legendary') {
-      return `${art_square}?h=800&resize=1&w=600`
+      return [
+        `${art_square}?h=800&resize=1&w=600`,
+        `${art_square}?h=400&resize=1&w=300`
+      ]
     } else {
-      return art_square
+      return [art_square, '']
     }
   }
 
+  const [src, fallback] = getImageFormatting()
+
   return (
     <div className="gamePicture">
-      <img alt="cover-art" src={getImageFormatting()} className="gameImg" />
+      <CachedImage
+        alt="cover-art"
+        className="gameImg"
+        src={src}
+        fallback={fallback}
+      />
     </div>
   )
 }

src/screens/Library/components/GameCard/index.tsx

@@ -17,7 +17,7 @@ import { useTranslation } from 'react-i18next'
 import ContextProvider from 'src/state/ContextProvider'
 import fallbackImage from 'src/assets/fallback-image.jpg'
 import { uninstall, updateGame } from 'src/helpers/library'
-import { SvgButton } from 'src/components/UI'
+import { CachedImage, SvgButton } from 'src/components/UI'
 import ContextMenu, { Item } from '../ContextMenu'
 import { hasProgress } from 'src/hooks/hasProgress'
 
@@ -337,9 +337,9 @@ const GameCard = ({
             }
           >
             {showStoreLogos()}
-            <img src={imageSrc} className={imgClasses} alt="cover" />
+            <CachedImage src={imageSrc} className={imgClasses} alt="cover" />
             {logo && (
-              <img
+              <CachedImage
                 alt="logo"
                 src={`${logo}?h=400&resize=1&w=300`}
                 className={logoClasses}