How to use readProtocolStream method in Playwright Internal

Best JavaScript code snippet using playwright-internal

helper.js

Source: helper.js Github

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...162 if (timeoutTimer)163 clearTimeout(timeoutTimer);164 }165}166async function readProtocolStream(client, handle, path) {167 let eof = false;168 let file;169 if (path)170 file = await openAsync(path, 'w');171 const bufs = [];172 while (!eof) {173 const response = await client.send('IO.read', { handle });174 eof = response.eof;175 const buf = Buffer.from(response.data, response.base64Encoded ? 'base64' : undefined);176 bufs.push(buf);177 if (path)178 await writeAsync(file, buf);179 }180 if (path)...

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crProtocolHelper.js

Source: crProtocolHelper.js Github

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...44 await client.send('Runtime.releaseObject', {45 objectId46 }).catch(error => {});47}48async function readProtocolStream(client, handle, path) {49 let eof = false;50 let fd;51 if (path) {52 await (0, _utils.mkdirIfNeeded)(path);53 fd = await _fs.default.promises.open(path, 'w');54 }55 const bufs = [];56 while (!eof) {57 const response = await client.send('IO.read', {58 handle59 });60 eof = response.eof;61 const buf = Buffer.from(response.data, response.base64Encoded ? 'base64' : undefined);62 bufs.push(buf);...

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Tracing.js

Source: Tracing.js Github

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...54 async stop() {55 let fulfill;56 const contentPromise = new Promise(x => fulfill = x);57 this._client.once('Tracing.tracingComplete', event => {58 helper.readProtocolStream(this._client, event.stream, this._path).then(fulfill);59 });60 await this._client.send('Tracing.end');61 this._recording = false;62 return contentPromise;63 }64}...

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Using AI Code Generation

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1const fs = require('fs');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch({ headless: false });5 const context = await browser.newContext();6 const page = await context.newPage();7 const stream = fs.createWriteStream('trace.json');8 await page.tracing.start({ screenshots: true, snapshots: true });9 await page.tracing.stop({ path: stream });10 await browser.close();11})();12const fs = require('fs');13const { chromium } = require('playwright');14(async () => {15 const browser = await chromium.launch({ headless: false });16 const context = await browser.newContext();17 const page = await context.newPage();18 const stream = fs.createWriteStream('trace.json');19 await page.tracing.start({ screenshots: true, snapshots: true });20 await page.tracing.stop({ path: stream });21 await browser.close();22})();23 at Tracing._throwIfAlreadyStarted (C:\Users\ashish\Documents\playwright\playwright\lib\server\tracing\tracing.js:34:11)24 at Tracing.start (C:\Users\ashish\Documents\playwright\playwright\lib\server\tracing\tracing.js:25:14)25 at Page.startTracing (C:\Users\ashish\Documents\playwright\playwright\lib\server\page.js:308:29)26 at Page.startTracing (C:\Users\ashish\Documents\playwright\playwright\lib\server\chromium\chromiumPage.js:34:15)27 at Page.startTracing (C:\Users\ashish\Documents\playwright\playwright\lib\server\firefox\firefoxPage.js:34:15)28 at Page.startTracing (C:\Users\ashish\Documents\playwright\playwright\lib\server\webkit\webkitPage.js:34:15

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Using AI Code Generation

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1const { readProtocolStream } = require('playwright/​lib/​server/​protocol');2const { createReadStream } = require('fs');3const stream = createReadStream('./​protocol.json');4const protocol = await readProtocolStream(stream);5console.log(protocol);6{7 {8 {9 },10 {11 },12 {13 {14 },15 {16 },17 {18 "description": "Line offset of the script within the resource with given URL (for script tags)."19 },20 {21 },22 {23 },24 {25 }26 },27 {28 {29 },30 {31 },32 {

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Using AI Code Generation

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1const { readProtocolStream } = require('playwright/​lib/​server/​supplements/​recorder/​recorderApp');2const fs = require('fs');3(async () => {4 const stream = fs.createReadStream('recording.har', { encoding: 'utf-8' });5 const result = await readProtocolStream(stream);6 console.log(result);7})();8export type ProtocolCommand = {9 method: string;10 params: any;11 timestamp: number;12 sessionId?: string;13};14export async function readProtocolStream(stream: Readable) {15 const commands: ProtocolCommand[] = [];16 const parser = new HARParser();17 const har = await parser.parse(stream);18 for (const entry of har.log.entries) {19 for (const command of entry.playwrightCommands) {20 commands.push(command);21 }22 }23 return commands;24}25export class HARParser {26 async parse(stream: Readable) {27 const chunks: Buffer[] = [];28 for await (const chunk of stream)29 chunks.push(chunk);30 const text = Buffer.concat(chunks).toString('utf8');31 return JSON.parse(text);32 }33}34export class HARParser {35 async parse(stream: Readable) {36 const chunks: Buffer[] = [];37 for await (const chunk of stream)38 chunks.push(chunk);39 const text = Buffer.concat(chunks).toString('utf8');40 return JSON.parse(text);41 }42}

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Using AI Code Generation

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1const fs = require('fs');2const { readProtocolStream } = require('playwright/​lib/​server/​protocol');3const stream = fs.createReadStream('protocol.json');4readProtocolStream(stream).then( protocol => {5 console.log(protocol);6});7const fs = require('fs');8const { readProtocolStream } = require('playwright/​lib/​server/​protocol');9const stream = fs.createReadStream('protocol.json');10stream.on('data', (chunk) => {11 console.log(chunk);12});13const fs = require('fs');14const { readProtocolStream } = require('playwright/​lib/​server/​protocol');15const stream = fs.createReadStream('protocol.json');16stream.on('data', (chunk) => {17 console.log(chunk);18});

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StackOverFlow community discussions

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firefox browser does not start in playwright

firefox browser does not start in playwright

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I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

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