Created
August 11, 2024 00:53
-
-
Save websmithcode/f3894590b8e6cdb28230fc30c8cdfd6b to your computer and use it in GitHub Desktop.
managed request caching system for playwright with typescript
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import type { Page, Response } from "playwright"; | |
| import fs from 'fs'; | |
| export class PWCache { | |
| private readonly cacheDir = './.cache'; | |
| statistics: { | |
| totalRequests: number; | |
| totalCached: number; | |
| totalNotCached: number; | |
| }; | |
| constructor( | |
| public page: Page | |
| ) { | |
| this.statistics = new Proxy({ | |
| totalRequests: 0, | |
| totalCached: 0, | |
| totalNotCached: 0, | |
| } | |
| , { | |
| set: (target, key, value) => { | |
| // @ts-ignore | |
| target[key] = value; | |
| console.log(`Statistics: ${JSON.stringify(target)}`); | |
| return true; | |
| }, | |
| }); | |
| } | |
| async run() { | |
| if (!fs.existsSync(this.cacheDir)) { | |
| fs.mkdirSync(this.cacheDir); | |
| } | |
| await this.page.route('**/*', async route => { | |
| this.statistics.totalRequests++; | |
| const request = route.request(); | |
| const url = request.url(); | |
| if (PWCache._isUrlForCaching(url)) { | |
| console.log(`Response Cache: ${url}`); | |
| const cachedFile = `${this.cacheDir}/${encodeURIComponent(url)}`; | |
| if (fs.existsSync(cachedFile)) { | |
| this.statistics.totalCached++; | |
| const body = fs.readFileSync(cachedFile); | |
| await route.fulfill({ | |
| body: body, | |
| headers: { 'content-type': PWCache._getContentType(url) }, | |
| }); | |
| return; | |
| } | |
| } else { | |
| this.statistics.totalNotCached++; | |
| } | |
| route.continue(); | |
| }); | |
| this.page.on('response', async (response: Response) => { | |
| const request = response.request(); | |
| const url = request.url(); | |
| const cachedFile = `${this.cacheDir}/${encodeURIComponent(url)}`; | |
| console.log(`Response: ${url}`); | |
| try { | |
| if (PWCache._isUrlForCaching(url)) { | |
| if (url.includes('.mp4')) { | |
| const file = await response.finished().then(() => response.body()); | |
| fs.writeFileSync(cachedFile, file); | |
| } else { | |
| const file = await response.body(); | |
| fs.writeFileSync(cachedFile, file); | |
| } | |
| } | |
| } catch (error) { | |
| console.error(`Error Response with cached: ${url}`); | |
| console.info(error); | |
| } | |
| }); | |
| } | |
| static _isUrlForCaching(url: string): boolean { | |
| const fileExtensions = [ | |
| '.css', | |
| '.js', | |
| '.png', | |
| '.jpg', | |
| '.woff', | |
| '.woff2', | |
| '.ogg', | |
| '.ttf', | |
| '.mp4' | |
| ]; | |
| switch (true) { | |
| case fileExtensions.some(ext => url.split('?')[0].endsWith(ext)): | |
| return true; | |
| default: | |
| return false; | |
| } | |
| } | |
| static _getContentType(url: string): string { | |
| const types: { [key: string]: string } = { | |
| '.css': 'text/css', | |
| '.js': 'application/javascript', | |
| '.png': 'image/png', | |
| '.jpg': 'image/jpeg', | |
| '.woff': 'font/woff', | |
| '.woff2': 'font/woff2', | |
| '.ogg': 'audio/ogg', | |
| '.ttf': 'font/ttf', | |
| } | |
| const ext = url.split('?')[0].split('.').pop(); | |
| if (`.${ext}` in types) { | |
| return types[`.${ext}`]; | |
| } | |
| return 'application/octet-stream'; | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment