From 159fca85e4eacc2c43d9978bd75eee6b76283914 Mon Sep 17 00:00:00 2001 From: Christian Johannesen Date: Thu, 29 Oct 2026 20:35:33 +0100 Subject: [PATCH] Serve persistent cached WebP screenshots at quality 90 --- .gitignore | 1 + Dockerfile | 4 + README.md | 2 + compose.yaml | 4 + package-lock.json | 600 +++++++++++++++++++++++++++++++++++++++++++ package.json | 6 + screenshot-cache.mjs | 36 +++ server.mjs | 33 ++- 8 files changed, 678 insertions(+), 8 deletions(-) create mode 100644 .gitignore create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 screenshot-cache.mjs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c2658d7 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +node_modules/ diff --git a/Dockerfile b/Dockerfile index 3d6414e..32e92bf 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,12 +1,16 @@ FROM node:22-alpine WORKDIR /app +COPY package*.json ./ +RUN npm ci --omit=dev && mkdir /app/screenshot-cache && chown node:node /app/screenshot-cache COPY server.mjs ./server.mjs +COPY screenshot-cache.mjs ./screenshot-cache.mjs COPY public ./public COPY . /programs ENV PORT=8080 ENV PROGRAM_DIRECTORY=/programs +ENV SCREENSHOT_CACHE_DIRECTORY=/app/screenshot-cache EXPOSE 8080 USER node diff --git a/README.md b/README.md index 443bd5d..7b31272 100644 --- a/README.md +++ b/README.md @@ -87,6 +87,8 @@ The tools profile is opt-in and is not started by the normal app command. Every program has a recipe in `screenshots.json`. The recipe waits for the emulator, focuses it, dismisses the splash screen, performs any program-specific actions, and captures a clean 960×720 PNG from the browser compositor. Screenshots are stored as `screenshot.png` beside each program and appear automatically in the grid view; no web-app rebuild is required. +The website serves screenshots as WebP at quality 90. PNG originals remain untouched. Converted images are generated on first request and retained in the persistent `screenshot-cache` Docker volume. Content-based URLs invalidate browser caches when an original changes; subsequent requests reuse the WebP file without converting it again. + Capture screenshots that do not exist yet: ```text diff --git a/compose.yaml b/compose.yaml index 77a9a47..ac1639d 100644 --- a/compose.yaml +++ b/compose.yaml @@ -7,6 +7,7 @@ services: PROGRAM_DIRECTORY: /programs volumes: - .:/programs:ro + - screenshot-cache:/app/screenshot-cache restart: unless-stopped assembler: @@ -31,3 +32,6 @@ services: depends_on: - c64-basic +volumes: + screenshot-cache: + diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..d1421b3 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,600 @@ +{ + "name": "c64-program-collection", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "c64-program-collection", + "dependencies": { + "sharp": "0.35.5" + } + }, + "node_modules/@emnapi/runtime": { + "version": "1.11.3", + "resolved": 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+ } + } +} diff --git a/package.json b/package.json new file mode 100644 index 0000000..5c00031 --- /dev/null +++ b/package.json @@ -0,0 +1,6 @@ +{ + "name": "c64-program-collection", + "private": true, + "type": "module", + "dependencies": { "sharp": "0.35.5" } +} diff --git a/screenshot-cache.mjs b/screenshot-cache.mjs new file mode 100644 index 0000000..52d7865 --- /dev/null +++ b/screenshot-cache.mjs @@ -0,0 +1,36 @@ +import { createHash } from 'node:crypto'; +import { readFileSync, statSync } from 'node:fs'; +import { mkdir, stat, rename } from 'node:fs/promises'; +import { join } from 'node:path'; +import sharp from 'sharp'; + +const versions = new Map(); +const pending = new Map(); +const encoding = 'webp-q90-v1'; + +export function screenshotVersion(path) { + const info = statSync(path); + const signature = `${info.mtimeMs}:${info.ctimeMs}:${info.size}`; + const cached = versions.get(path); + if (cached?.signature === signature) return cached.version; + const version = createHash('sha256').update(encoding).update(readFileSync(path)).digest('hex'); + versions.set(path, { signature, version }); + return version; +} + +export async function cachedScreenshot(source, directory, version) { + const destination = join(directory, `${version}.webp`); + if (pending.has(destination)) return pending.get(destination); + const conversion = (async () => { + await mkdir(directory, { recursive: true }); + try { await stat(destination); return destination; } + catch (error) { if (error.code !== 'ENOENT') throw error; } + const temporary = `${destination}.${process.pid}.tmp`; + await sharp(source).webp({ quality: 90 }).toFile(temporary); + await rename(temporary, destination); + return destination; + })(); + pending.set(destination, conversion); + try { return await conversion; } + finally { pending.delete(destination); } +} diff --git a/server.mjs b/server.mjs index 40cdf62..ed2c883 100644 --- a/server.mjs +++ b/server.mjs @@ -2,11 +2,13 @@ import { createReadStream, existsSync, readFileSync, statSync } from 'node:fs'; import { createServer } from 'node:http'; import { extname, join, normalize, resolve, sep } from 'node:path'; import { fileURLToPath } from 'node:url'; +import { cachedScreenshot, screenshotVersion } from './screenshot-cache.mjs'; const port = Number(process.env.PORT || 8080); const programDirectory = resolve(process.env.PROGRAM_DIRECTORY || fileURLToPath(new URL('./', import.meta.url))); const manifestPath = join(programDirectory, 'programs.json'); const publicDirectory = fileURLToPath(new URL('./public/', import.meta.url)); +const screenshotCacheDirectory = resolve(process.env.SCREENSHOT_CACHE_DIRECTORY || '/tmp/c64-screenshots'); function sendJson(response, status, value, headOnly = false) { const body = JSON.stringify(value); @@ -51,7 +53,7 @@ function fetchPrograms() { slug, size: statSync(filePath).size, screenshot: screenshotStat - ? `/api/screenshot?slug=${encodeURIComponent(slug)}&v=${Math.trunc(screenshotStat.mtimeMs)}` + ? `/api/screenshot?slug=${encodeURIComponent(slug)}&v=${screenshotVersion(screenshotPath)}` : null }; }); @@ -91,17 +93,32 @@ function sendSource(response, programPath, headOnly = false) { else createReadStream(filePath).pipe(response); } -function sendScreenshot(response, slug, headOnly = false) { - const program = fetchPrograms().find(entry => entry.slug === slug && entry.screenshot); - if (!program) { +async function sendScreenshot(request, response, slug, requestedVersion, headOnly = false) { + // Image requests validate only their target; do not stat the entire library. + const validSlug = /^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(slug); + const programs = JSON.parse(readFileSync(manifestPath, 'utf8')); + const knownProgram = validSlug && programs.some(entry => entry.path?.split('/')[0] === slug); + const sourcePath = validSlug ? resolve(programDirectory, slug, 'screenshot.png') : ''; + if (!knownProgram || !existsSync(sourcePath) || !statSync(sourcePath).isFile()) { sendJson(response, 404, { error: 'Program screenshot not found' }, headOnly); return; } - const filePath = resolve(programDirectory, slug, 'screenshot.png'); + const version = screenshotVersion(sourcePath); + const filePath = await cachedScreenshot(sourcePath, screenshotCacheDirectory, version); + const etag = `"${version}"`; + const cacheControl = requestedVersion === version + ? 'public, max-age=31536000, immutable' + : 'public, max-age=0, must-revalidate'; + if (request.headers['if-none-match'] === etag) { + response.writeHead(304, { ETag: etag, 'Cache-Control': cacheControl }); + response.end(); + return; + } response.writeHead(200, { - 'Content-Type': 'image/png', + 'Content-Type': 'image/webp', 'Content-Length': statSync(filePath).size, - 'Cache-Control': 'public, max-age=31536000, immutable' + 'Cache-Control': cacheControl, + 'ETag': etag }); if (headOnly) response.end(); else createReadStream(filePath).pipe(response); @@ -140,7 +157,7 @@ createServer(async (request, response) => { } else if (url.pathname === '/api/source') { sendSource(response, url.searchParams.get('path') || '', headOnly); } else if (url.pathname === '/api/screenshot') { - sendScreenshot(response, url.searchParams.get('slug') || '', headOnly); + await sendScreenshot(request, response, url.searchParams.get('slug') || '', url.searchParams.get('v'), headOnly); } else if (!serveStatic(response, url.pathname, headOnly)) { sendJson(response, 404, { error: 'Not found' }, headOnly); }