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Add PDF file caching

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This commit is contained in:
Krisjanis Lejejs
2022-10-05 23:18:10 +03:00
parent 9b1f3eda05
commit 78a32961d7
9 changed files with 77 additions and 66 deletions
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6
server/src/printer/printer.controller.ts
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@ -1,4 +1,4 @@
import { Controller, Get, Param } from '@nestjs/common';
import { Controller, Get, Param, Query } from '@nestjs/common';
import { PrinterService } from './printer.service';
@ -7,7 +7,7 @@ export class PrinterController {
constructor(private readonly printerService: PrinterService) {}
@Get('/:username/:slug')
printAsPdf(@Param('username') username: string, @Param('slug') slug: string): Promise<string> {
return this.printerService.printAsPdf(username, slug);
printAsPdf(@Param('username') username: string, @Param('slug') slug: string, @Query('lastUpdated') lastUpdated: string): Promise<string> {
return this.printerService.printAsPdf(username, slug, lastUpdated);
}
}

102
server/src/printer/printer.service.ts
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@ -1,9 +1,7 @@
import { Injectable, OnModuleDestroy, OnModuleInit } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { SchedulerRegistry } from '@nestjs/schedule';
import { PageConfig } from '@reactive-resume/schema';
import { mkdir, unlink, writeFile } from 'fs/promises';
import { nanoid } from 'nanoid';
import { access, mkdir, readdir, unlink, writeFile } from 'fs/promises';
import { join } from 'path';
import { PDFDocument } from 'pdf-lib';
import { Browser, chromium } from 'playwright-chromium';
@ -14,7 +12,7 @@ export const DELETION_TIME = 10 * 1000; // 10 seconds
export class PrinterService implements OnModuleInit, OnModuleDestroy {
private browser: Browser;
constructor(private readonly schedulerRegistry: SchedulerRegistry, private readonly configService: ConfigService) {}
constructor(private readonly configService: ConfigService) {}
async onModuleInit() {
this.browser = await chromium.launch({
@ -26,68 +24,70 @@ export class PrinterService implements OnModuleInit, OnModuleDestroy {
await this.browser.close();
}
async printAsPdf(username: string, slug: string): Promise<string> {
const url = this.configService.get<string>('app.url');
async printAsPdf(username: string, slug: string, lastUpdated: string): Promise<string> {
const serverUrl = this.configService.get<string>('app.serverUrl');
const secretKey = this.configService.get<string>('app.secretKey');
const page = await this.browser.newPage();
await page.goto(`${url}/${username}/${slug}/printer?secretKey=${secretKey}`);
await page.waitForSelector('html.wf-active');
const pageFormat: PageConfig['format'] = await page.$$eval(
'[data-page]',
(pages) => pages[0].getAttribute('data-format') as PageConfig['format']
);
const resumePages = await page.$$eval('[data-page]', (pages) =>
pages.map((page, index) => ({
pageNumber: index + 1,
innerHTML: page.innerHTML,
height: page.clientHeight,
}))
);
const pdf = await PDFDocument.create();
const directory = join(__dirname, '..', 'assets/exports');
const filename = `RxResume_PDFExport_${nanoid()}.pdf`;
const filename = `RxResume_PDFExport_${username}_${slug}_${lastUpdated}.pdf`;
const publicUrl = `${serverUrl}/assets/exports/${filename}`;
for (let index = 0; index < resumePages.length; index++) {
await page.evaluate((page) => (document.body.innerHTML = page.innerHTML), resumePages[index]);
const buffer = await page.pdf({
printBackground: true,
height: resumePages[index].height,
width: pageFormat === 'A4' ? '210mm' : '216mm',
try { // check if file already exists
await access(join(directory, filename));
} catch { // create file as it doesn't exist
// delete old files
await readdir(directory).then(async (files) => {
await Promise.all(files.map(async (file) => {
if (file.startsWith(`RxResume_PDFExport_${username}_${slug}`)) {
await unlink(join(directory, file));
}
}));
});
const pageDoc = await PDFDocument.load(buffer);
const copiedPages = await pdf.copyPages(pageDoc, [0]);
const url = this.configService.get<string>('app.url');
const secretKey = this.configService.get<string>('app.secretKey');
copiedPages.forEach((copiedPage) => pdf.addPage(copiedPage));
}
const page = await this.browser.newPage();
await page.close();
await page.goto(`${url}/${username}/${slug}/printer?secretKey=${secretKey}`);
await page.waitForSelector('html.wf-active');
const pdfBytes = await pdf.save();
const pageFormat: PageConfig['format'] = await page.$$eval(
'[data-page]',
(pages) => pages[0].getAttribute('data-format') as PageConfig['format']
);
await mkdir(directory, { recursive: true });
await writeFile(join(directory, filename), pdfBytes);
const resumePages = await page.$$eval('[data-page]', (pages) =>
pages.map((page, index) => ({
pageNumber: index + 1,
innerHTML: page.innerHTML,
height: page.clientHeight,
}))
);
// Delete PDF artifacts after DELETION_TIME ms
const timeout = setTimeout(async () => {
try {
await unlink(join(directory, filename));
const pdf = await PDFDocument.create();
this.schedulerRegistry.deleteTimeout(`delete-${filename}`);
} catch {
// pass through
for (let index = 0; index < resumePages.length; index++) {
await page.evaluate((page) => (document.body.innerHTML = page.innerHTML), resumePages[index]);
const buffer = await page.pdf({
printBackground: true,
height: resumePages[index].height,
width: pageFormat === 'A4' ? '210mm' : '216mm',
});
const pageDoc = await PDFDocument.load(buffer);
const copiedPages = await pdf.copyPages(pageDoc, [0]);
copiedPages.forEach((copiedPage) => pdf.addPage(copiedPage));
}
}, DELETION_TIME);
this.schedulerRegistry.addTimeout(`delete-${filename}`, timeout);
await page.close();
const pdfBytes = await pdf.save();
await mkdir(directory, { recursive: true });
await writeFile(join(directory, filename), pdfBytes);
}
return publicUrl;
}