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pageVideoStreamCollector.ts
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pageVideoStreamCollector.ts
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import { EventEmitter } from 'events';
import { CDPSession, Page } from 'puppeteer';
import { PuppeteerScreenRecorderOptions } from './pageVideoStreamTypes';
/**
* @ignore
*/
export class pageVideoStreamCollector extends EventEmitter {
private page: Page;
private options: PuppeteerScreenRecorderOptions;
private sessionsStack: [CDPSession?] = [];
private isStreamingEnded = false;
private isFrameAckReceived: Promise<void>;
constructor(page: Page, options: PuppeteerScreenRecorderOptions) {
super();
this.page = page;
this.options = options;
}
private get shouldFollowPopupWindow(): boolean {
return this.options.followNewTab;
}
private async getPageSession(page: Page): Promise<CDPSession | null> {
try {
const context = page.target();
return await context.createCDPSession();
} catch (error) {
console.log('Failed to create CDP Session', error);
return null;
}
}
private getCurrentSession(): CDPSession | null {
return this.sessionsStack[this.sessionsStack.length - 1];
}
private addListenerOnTabOpens(page: Page): void {
page.on('popup', () => this.registerTabListener(page));
}
private removeListenerOnTabClose(page: Page): void {
page.off('popup', () => this.registerTabListener(page));
}
private async registerTabListener(newPage: Page): Promise<void> {
await this.startSession(newPage);
newPage.once('close', async () => await this.endSession());
}
private async startScreenCast(shouldDeleteSessionOnFailure = false) {
const currentSession = this.getCurrentSession();
try {
await currentSession.send('Page.startScreencast', {
everyNthFrame: 1,
});
} catch (e) {
if (shouldDeleteSessionOnFailure) {
this.endSession();
}
}
}
private async stopScreenCast() {
const currentSession = this.getCurrentSession();
if (!currentSession) {
return;
}
await currentSession.send('Page.stopScreencast');
}
private async startSession(page: Page): Promise<void> {
const pageSession = await this.getPageSession(page);
if (!pageSession) {
return;
}
await this.stopScreenCast();
this.sessionsStack.push(pageSession);
this.handleScreenCastFrame(pageSession);
await this.startScreenCast(true);
}
private async handleScreenCastFrame(session) {
this.isFrameAckReceived = new Promise((resolve) => {
session.on(
'Page.screencastFrame',
async ({ metadata, data, sessionId }) => {
if (!metadata.timestamp || this.isStreamingEnded) {
return resolve();
}
const ackPromise = session.send('Page.screencastFrameAck', {
sessionId: sessionId,
});
this.emit('pageScreenFrame', {
blob: Buffer.from(data, 'base64'),
timestamp: metadata.timestamp,
});
try {
await ackPromise;
} catch (error) {
console.error(
'Error in sending Acknowledgment for PageScreenCast',
error.message
);
}
}
);
});
}
private async endSession(): Promise<void> {
this.sessionsStack.pop();
await this.startScreenCast();
}
public async start(): Promise<void> {
await this.startSession(this.page);
if (this.shouldFollowPopupWindow) {
this.addListenerOnTabOpens(this.page);
}
}
public async stop(): Promise<boolean> {
if (this.isStreamingEnded) {
return this.isStreamingEnded;
}
if (this.shouldFollowPopupWindow) {
this.removeListenerOnTabClose(this.page);
}
await Promise.race([
this.isFrameAckReceived,
new Promise((resolve) => setTimeout(resolve, 1000)),
]);
this.isStreamingEnded = true;
try {
for (const currentSession of this.sessionsStack) {
await currentSession.detach();
}
} catch (e) {
console.warn('Error detaching session', e.message);
}
return true;
}
}