smartssr/ts/smartssr.classes.smartssr.ts

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import * as plugins from './smartssr.plugins';
import * as paths from './smartssr.paths';
import { serializeFunction } from './smartssr.function.serialize';
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export interface ISmartSSROptions {
debug: boolean;
}
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/**
*
*/
export class SmartSSR {
public browser: plugins.smartpuppeteer.puppeteer.Browser;
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public options: ISmartSSROptions;
constructor(optionsArg?: ISmartSSROptions) {
this.options = {
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...{
debug: false,
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},
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...optionsArg,
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};
}
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public async start() {
this.browser = await plugins.smartpuppeteer.getEnvAwareBrowserInstance();
}
public async stop() {
if (this.browser) {
await plugins.smartdelay.delayFor(3000);
await this.browser.close();
this.browser = null;
} else {
console.log('browser was not in started mode');
}
}
public async renderPage(urlArg: string) {
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const overallTimeMeasurement = new plugins.smarttime.HrtMeasurement();
overallTimeMeasurement.start();
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const resultDeferred = plugins.smartpromise.defer<string>();
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const context = await this.browser.createIncognitoBrowserContext();
const page = await context.newPage();
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page.on('console', (msg) => {
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console.log(`${urlArg}: ${msg.text()}`);
});
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page.on('load', async (...args) => {
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await plugins.smartdelay.delayFor(5000);
let screenshotBuffer: Buffer;
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if (this.options.debug) {
screenshotBuffer = await page.screenshot({
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encoding: 'binary',
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});
}
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await page.$eval('body', serializeFunction);
const pageContent = await page.content();
const renderedPageString = pageContent;
resultDeferred.resolve(renderedPageString);
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if (this.options.debug) {
plugins.smartfile.memory.toFsSync(
renderedPageString,
plugins.path.join(paths.noGitDir, 'test.html')
);
const fs = await import('fs');
fs.writeFileSync(plugins.path.join(paths.noGitDir, 'test.png'), screenshotBuffer);
}
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});
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const renderTimeMeasurement = new plugins.smarttime.HrtMeasurement();
renderTimeMeasurement.start();
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await page.goto(urlArg);
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const result = await resultDeferred.promise;
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renderTimeMeasurement.stop();
// lets clean up async
context.close();
overallTimeMeasurement.stop();
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console.log(
`Overall it took ${overallTimeMeasurement.milliSeconds} milliseconds to render ${urlArg}`
);
console.log(
`The rendering alone took ${renderTimeMeasurement.milliSeconds} milliseconds for ${urlArg}`
);
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return result;
}
}