From 25865acd44144e498c0bf70e072651ffdb1be4e5 Mon Sep 17 00:00:00 2001 From: Andras Schmelczer Date: Tue, 3 Feb 2026 19:21:51 +0000 Subject: [PATCH] Add screenshot server --- docker-compose.yml | 30 ++ og-screenshot/Dockerfile | 21 + og-screenshot/package-lock.json | 913 ++++++++++++++++++++++++++++++++ og-screenshot/package.json | 19 + og-screenshot/src/cache.ts | 88 +++ og-screenshot/src/screenshot.ts | 86 +++ og-screenshot/src/server.ts | 73 +++ og-screenshot/tsconfig.json | 17 + 8 files changed, 1247 insertions(+) create mode 100644 docker-compose.yml create mode 100644 og-screenshot/Dockerfile create mode 100644 og-screenshot/package-lock.json create mode 100644 og-screenshot/package.json create mode 100644 og-screenshot/src/cache.ts create mode 100644 og-screenshot/src/screenshot.ts create mode 100644 og-screenshot/src/server.ts create mode 100644 og-screenshot/tsconfig.json diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..5b0adab --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,30 @@ +services: + narrowit: + build: . + ports: + - "8001:8001" + volumes: + - ./data:/data:ro + environment: + OG_SIDECAR_URL: http://og-screenshot:8002 + PUBLIC_URL: https://narrowit.schmelczer.dev + depends_on: + og-screenshot: + condition: service_healthy + + og-screenshot: + build: ./og-screenshot + environment: + NARROWIT_URL: http://narrowit:8001 + CACHE_DIR: /cache + volumes: + - og-cache:/cache + healthcheck: + test: ["CMD", "curl", "-f", "http://localhost:8002/health"] + interval: 10s + timeout: 5s + retries: 3 + start_period: 30s + +volumes: + og-cache: diff --git a/og-screenshot/Dockerfile b/og-screenshot/Dockerfile new file mode 100644 index 0000000..65a3383 --- /dev/null +++ b/og-screenshot/Dockerfile @@ -0,0 +1,21 @@ +FROM node:20-slim + +RUN apt-get update && \ + apt-get install -y --no-install-recommends curl && \ + rm -rf /var/lib/apt/lists/* + +WORKDIR /app + +COPY package.json package-lock.json* ./ +RUN npm install + +# 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+ "version": "1.0.0", + "private": true, + "scripts": { + "build": "tsc", + "start": "node dist/server.js", + "dev": "tsc --watch & node --watch dist/server.js" + }, + "dependencies": { + "express": "^4.21.0", + "playwright": "^1.49.0" + }, + "devDependencies": { + "@types/express": "^5.0.0", + "@types/node": "^22.0.0", + "typescript": "^5.7.0" + } +} diff --git a/og-screenshot/src/cache.ts b/og-screenshot/src/cache.ts new file mode 100644 index 0000000..25c0092 --- /dev/null +++ b/og-screenshot/src/cache.ts @@ -0,0 +1,88 @@ +import { createHash } from 'crypto'; +import { existsSync, mkdirSync, statSync, createReadStream, writeFileSync } from 'fs'; +import { join } from 'path'; +import type { Readable } from 'stream'; + +const MAX_AGE_MS = 24 * 60 * 60 * 1000; // 24 hours + +export class ScreenshotCache { + private dir: string; + + constructor(dir: string) { + this.dir = dir; + if (!existsSync(dir)) { + mkdirSync(dir, { recursive: true }); + } + } + + /** + * Build a cache key by quantizing view params and hashing. + * - lat/lng quantized to 2 decimal places + * - zoom quantized to integer + * - filters sorted alphabetically + */ + buildKey(params: Record): string { + const normalized: Record = {}; + + // Parse and quantize the view param (lat,lng,zoom) + if (params.v) { + const parts = params.v.split(','); + if (parts.length === 3) { + const lat = parseFloat(parts[0]).toFixed(2); + const lng = parseFloat(parts[1]).toFixed(2); + const zoom = Math.round(parseFloat(parts[2])).toString(); + normalized.v = `${lat},${lng},${zoom}`; + } else { + normalized.v = params.v; + } + } + + // Sort filters + if (params.f) { + const segments = params.f.split(',').sort(); + normalized.f = segments.join(','); + } + + if (params.poi) { + const cats = params.poi.split(',').sort(); + normalized.poi = cats.join(','); + } + + if (params.tab) { + normalized.tab = params.tab; + } + + const input = JSON.stringify(normalized); + const hash = createHash('sha256').update(input).digest('hex').substring(0, 16); + return hash; + } + + getPath(key: string): string { + return join(this.dir, `${key}.png`); + } + + /** + * Returns a readable stream if a fresh cached file exists, null otherwise. + */ + get(key: string): Readable | null { + const path = this.getPath(key); + if (!existsSync(path)) return null; + + try { + const stat = statSync(path); + const age = Date.now() - stat.mtimeMs; + if (age > MAX_AGE_MS) return null; + return createReadStream(path); + } catch { + return null; + } + } + + /** + * Write screenshot bytes to cache. + */ + set(key: string, data: Buffer): void { + const path = this.getPath(key); + writeFileSync(path, data); + } +} diff --git a/og-screenshot/src/screenshot.ts b/og-screenshot/src/screenshot.ts new file mode 100644 index 0000000..d202816 --- /dev/null +++ b/og-screenshot/src/screenshot.ts @@ -0,0 +1,86 @@ +import { chromium, type Browser, type BrowserContext } from 'playwright'; + +const VIEWPORT = { width: 1200, height: 630 }; +const NAVIGATION_TIMEOUT = 15_000; +const TILE_BUFFER_MS = 500; +const MAX_CONCURRENT = 2; + +let browser: Browser | null = null; +let concurrency = 0; +const queue: Array<{ resolve: () => void }> = []; + +async function ensureBrowser(): Promise { + if (!browser || !browser.isConnected()) { + browser = await chromium.launch({ + args: [ + '--no-sandbox', + '--disable-dev-shm-usage', + '--use-gl=angle', + '--use-angle=swiftshader', + ], + }); + } + return browser; +} + +async function acquireSlot(): Promise { + if (concurrency < MAX_CONCURRENT) { + concurrency++; + return; + } + return new Promise((resolve) => { + queue.push({ resolve }); + }); +} + +function releaseSlot(): void { + concurrency--; + const next = queue.shift(); + if (next) { + concurrency++; + next.resolve(); + } +} + +export async function takeScreenshot(url: string): Promise { + await acquireSlot(); + let context: BrowserContext | null = null; + + try { + const instance = await ensureBrowser(); + context = await instance.newContext({ + viewport: VIEWPORT, + deviceScaleFactor: 1, + }); + const page = await context.newPage(); + + await page.goto(url, { waitUntil: 'networkidle', timeout: NAVIGATION_TIMEOUT }); + + // Wait for the frontend to signal readiness + try { + await page.waitForFunction('window.__og_ready === true', { + timeout: NAVIGATION_TIMEOUT, + }); + } catch { + // Proceed anyway — partial screenshot is better than nothing + } + + // Extra buffer for map tiles to finish rendering + await page.waitForTimeout(TILE_BUFFER_MS); + + const screenshot = await page.screenshot({ type: 'png' }); + return Buffer.from(screenshot); + } finally { + if (context) { + await context.close().catch(() => {}); + } + releaseSlot(); + } +} + +export async function closeBrowser(): Promise { + if (browser) { + await browser.close().catch(() => {}); + browser = null; + } +} diff --git a/og-screenshot/src/server.ts b/og-screenshot/src/server.ts new file mode 100644 index 0000000..72fb3df --- /dev/null +++ b/og-screenshot/src/server.ts @@ -0,0 +1,73 @@ +import express from 'express'; +import { ScreenshotCache } from './cache.js'; +import { takeScreenshot, closeBrowser } from './screenshot.js'; + +const PORT = parseInt(process.env.PORT || '8002', 10); +const NARROWIT_URL = process.env.NARROWIT_URL || 'http://localhost:8001'; +const CACHE_DIR = process.env.CACHE_DIR || '/cache'; + +const cache = new ScreenshotCache(CACHE_DIR); +const app = express(); + +app.get('/health', (_req, res) => { + res.status(200).send('ok'); +}); + +app.get('/screenshot', async (req, res) => { + try { + const params: Record = {}; + for (const key of ['v', 'f', 'poi', 'tab']) { + const val = req.query[key]; + if (typeof val === 'string' && val) { + params[key] = val; + } + } + + const cacheKey = cache.buildKey(params); + + // Check cache first + const cached = cache.get(cacheKey); + if (cached) { + res.setHeader('Content-Type', 'image/png'); + res.setHeader('Cache-Control', 'public, max-age=86400'); + res.setHeader('X-Cache', 'HIT'); + cached.pipe(res); + return; + } + + // Build the URL for the frontend in screenshot mode + const qs = new URLSearchParams(params); + qs.set('screenshot', '1'); + const url = `${NARROWIT_URL}/?${qs}`; + + console.log(`Taking screenshot: ${url}`); + const png = await takeScreenshot(url); + + // Cache it + cache.set(cacheKey, png); + + res.setHeader('Content-Type', 'image/png'); + res.setHeader('Cache-Control', 'public, max-age=86400'); + res.setHeader('X-Cache', 'MISS'); + res.send(png); + } catch (err) { + console.error('Screenshot failed:', err); + res.status(500).json({ error: 'Screenshot failed' }); + } +}); + +const server = app.listen(PORT, () => { + console.log(`OG screenshot service listening on port ${PORT}`); + console.log(` NARROWIT_URL: ${NARROWIT_URL}`); + console.log(` CACHE_DIR: ${CACHE_DIR}`); +}); + +// Graceful shutdown +for (const signal of ['SIGTERM', 'SIGINT']) { + process.on(signal, async () => { + console.log(`Received ${signal}, shutting down...`); + server.close(); + await closeBrowser(); + process.exit(0); + }); +} diff --git a/og-screenshot/tsconfig.json b/og-screenshot/tsconfig.json new file mode 100644 index 0000000..3e25c9a --- /dev/null +++ b/og-screenshot/tsconfig.json @@ -0,0 +1,17 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "Node16", + "moduleResolution": "Node16", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "declaration": false, + "sourceMap": false + }, + "include": ["src/**/*"], + "exclude": ["node_modules", "dist"] +}