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64184a7f56
[web] refactor pdf caching GitOrigin-RevId: af6b871fad652f757d8c465085b33a79b955cd6b
61 lines
1.6 KiB
JavaScript
61 lines
1.6 KiB
JavaScript
import { fallbackRequest, fetchRange } from './pdf-caching'
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import getMeta from '../../../utils/meta'
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import { captureException } from '../../../infrastructure/error-reporter'
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import { setCachingMetrics } from './metrics'
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export function generatePdfCachingTransportFactory(PDFJS) {
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if (getMeta('ol-pdfCachingMode') !== 'no-service-worker') {
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return () => null
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}
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const cached = new Set()
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const metrics = {
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failedCount: 0,
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tooLargeOverheadCount: 0,
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tooManyRequestsCount: 0,
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cachedCount: 0,
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cachedBytes: 0,
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fetchedCount: 0,
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fetchedBytes: 0,
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requestedCount: 0,
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requestedBytes: 0,
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}
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setCachingMetrics(metrics)
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class PDFDataRangeTransport extends PDFJS.PDFDataRangeTransport {
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constructor(url, pdfFile, reject) {
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super(pdfFile.size, new Uint8Array())
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this.url = url
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this.pdfFile = pdfFile
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this.reject = reject
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}
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requestDataRange(start, end) {
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fetchRange({
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url: this.url,
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start,
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end,
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file: this.pdfFile,
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metrics,
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cached,
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})
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.catch(err => {
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metrics.failedCount++
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console.error('optimized pdf download error', err)
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captureException(err)
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return fallbackRequest({ url: this.url, start, end })
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})
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.then(blob => {
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this.onDataRange(start, blob)
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})
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.catch(err => {
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console.error('fatal pdf download error', err)
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captureException(err)
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this.reject(err)
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})
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}
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}
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return function (url, pdfFile, reject) {
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return new PDFDataRangeTransport(url, pdfFile, reject)
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}
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}
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