mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-07 20:31:06 -05:00
956cacaef7
[misc] add split test for a per request pdfCachingMinChunkSize GitOrigin-RevId: 6a8a3c6267501789f2047a67b03db6ac6df427c3
737 lines
23 KiB
JavaScript
737 lines
23 KiB
JavaScript
// TODO: This file was created by bulk-decaffeinate.
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// Fix any style issues and re-enable lint.
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/*
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* decaffeinate suggestions:
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* DS101: Remove unnecessary use of Array.from
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* DS102: Remove unnecessary code created because of implicit returns
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* DS103: Rewrite code to no longer use __guard__
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* DS104: Avoid inline assignments
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* DS204: Change includes calls to have a more natural evaluation order
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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let OutputCacheManager
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const { callbackify, promisify } = require('util')
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const async = require('async')
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const fs = require('fs')
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const fse = require('fs-extra')
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const Path = require('path')
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const logger = require('@overleaf/logger')
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const _ = require('lodash')
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const Settings = require('@overleaf/settings')
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const crypto = require('crypto')
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const Metrics = require('./Metrics')
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const OutputFileOptimiser = require('./OutputFileOptimiser')
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const ContentCacheManager = require('./ContentCacheManager')
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const {
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QueueLimitReachedError,
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TimedOutError,
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NoXrefTableError,
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} = require('./Errors')
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const OLDEST_BUILD_DIR = new Map()
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const PENDING_PROJECT_ACTIONS = new Map()
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function init() {
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doInit().catch(err => {
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logger.fatal({ err }, 'low level error setting up cleanup of output dir')
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// consider shutting down?
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})
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}
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async function doInit() {
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await fillCache()
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const oldestTimestamp = await runBulkCleanup()
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scheduleBulkCleanup(oldestTimestamp)
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}
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function scheduleBulkCleanup(oldestTimestamp) {
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const delay =
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Math.max(OutputCacheManager.CACHE_AGE + oldestTimestamp - Date.now(), 0) +
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60 * 1000
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setTimeout(async function () {
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const oldestTimestamp = await runBulkCleanup()
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scheduleBulkCleanup(oldestTimestamp)
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}, delay)
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}
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async function fillCache() {
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const handle = await fs.promises.opendir(Settings.path.outputDir)
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try {
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for await (const { name: projectIdAndUserId } of handle) {
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OLDEST_BUILD_DIR.set(
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Path.join(Settings.path.outputDir, projectIdAndUserId),
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// Queue them for cleanup in the next hour.
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Date.now() - Math.random() * OutputCacheManager.CACHE_AGE
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)
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}
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} finally {
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try {
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await handle.close()
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} catch (e) {}
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}
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}
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async function runBulkCleanup() {
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const cleanupThreshold = Date.now() - OutputCacheManager.CACHE_AGE
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let oldestTimestamp = Date.now()
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for (const [dir, timeStamp] of OLDEST_BUILD_DIR.entries()) {
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if (timeStamp < cleanupThreshold) {
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await cleanupDirectory(dir, { limit: OutputCacheManager.CACHE_LIMIT })
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} else if (timeStamp < oldestTimestamp) {
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oldestTimestamp = timeStamp
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}
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}
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return oldestTimestamp
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}
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async function cleanupDirectory(dir, options) {
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return queueDirOperation(dir, async () => {
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try {
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await OutputCacheManager.promises.expireOutputFiles(dir, options)
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} catch (err) {
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logger.err({ dir, err }, 'cleanup of output directory failed')
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}
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})
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}
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async function queueDirOperation(dir, fn) {
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const pending = PENDING_PROJECT_ACTIONS.get(dir) || Promise.resolve()
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const p = pending.then(fn, fn).finally(() => {
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if (PENDING_PROJECT_ACTIONS.get(dir) === p) {
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PENDING_PROJECT_ACTIONS.delete(dir)
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}
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})
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PENDING_PROJECT_ACTIONS.set(dir, p)
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return p
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}
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module.exports = OutputCacheManager = {
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CONTENT_SUBDIR: 'content',
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CACHE_SUBDIR: 'generated-files',
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ARCHIVE_SUBDIR: 'archived-logs',
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// build id is HEXDATE-HEXRANDOM from Date.now()and RandomBytes
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// for backwards compatibility, make the randombytes part optional
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BUILD_REGEX: /^[0-9a-f]+(-[0-9a-f]+)?$/,
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CONTENT_REGEX: /^[0-9a-f]+(-[0-9a-f]+)?$/,
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CACHE_LIMIT: 2, // maximum number of cache directories
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CACHE_AGE: 60 * 60 * 1000, // up to one hour old
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init,
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queueDirOperation: callbackify(queueDirOperation),
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path(buildId, file) {
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// used by static server, given build id return '.cache/clsi/buildId'
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if (buildId.match(OutputCacheManager.BUILD_REGEX)) {
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return Path.join(OutputCacheManager.CACHE_SUBDIR, buildId, file)
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} else {
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// for invalid build id, return top level
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return file
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}
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},
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generateBuildId(callback) {
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// generate a secure build id from Date.now() and 8 random bytes in hex
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if (callback == null) {
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callback = function () {}
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}
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return crypto.randomBytes(8, function (err, buf) {
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if (err != null) {
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return callback(err)
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}
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const random = buf.toString('hex')
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const date = Date.now().toString(16)
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return callback(err, `${date}-${random}`)
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})
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},
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saveOutputFiles(
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{ request, stats, timings },
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outputFiles,
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compileDir,
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outputDir,
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callback
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) {
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if (callback == null) {
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callback = function () {}
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}
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return OutputCacheManager.generateBuildId(function (err, buildId) {
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if (err != null) {
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return callback(err)
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}
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if (!OLDEST_BUILD_DIR.has(outputDir)) {
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// Register for cleanup
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OLDEST_BUILD_DIR.set(outputDir, Date.now())
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}
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OutputCacheManager.queueDirOperation(
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outputDir,
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() =>
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OutputCacheManager.promises.saveOutputFilesInBuildDir(
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outputFiles,
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compileDir,
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outputDir,
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buildId
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),
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function (err, result) {
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if (err != null) {
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return callback(err)
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}
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OutputCacheManager.collectOutputPdfSize(
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result,
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outputDir,
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stats,
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(err, outputFiles) => {
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if (err) return callback(err, outputFiles)
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const enablePdfCaching = request.enablePdfCaching
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const enablePdfCachingDark =
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Settings.enablePdfCachingDark && !request.enablePdfCaching
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if (
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!Settings.enablePdfCaching ||
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(!enablePdfCaching && !enablePdfCachingDark)
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) {
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return callback(null, outputFiles)
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}
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OutputCacheManager.saveStreamsInContentDir(
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{ request, stats, timings, enablePdfCachingDark },
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outputFiles,
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compileDir,
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outputDir,
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(err, status) => {
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Metrics.inc('pdf-caching-status', 1, {
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status,
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...request.metricsOpts,
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})
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if (err) {
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logger.warn(
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{ err, outputDir, stats, timings },
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'pdf caching failed'
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)
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return callback(null, outputFiles)
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}
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callback(err, outputFiles)
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}
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)
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}
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)
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}
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)
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})
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},
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saveOutputFilesInBuildDir(
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outputFiles,
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compileDir,
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outputDir,
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buildId,
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callback
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) {
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// make a compileDir/CACHE_SUBDIR/build_id directory and
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// copy all the output files into it
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if (callback == null) {
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callback = function () {}
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}
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// Put the files into a new cache subdirectory
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const cacheDir = Path.join(
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outputDir,
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OutputCacheManager.CACHE_SUBDIR,
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buildId
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)
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// Is it a per-user compile? check if compile directory is PROJECTID-USERID
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const perUser = Path.basename(compileDir).match(
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/^[0-9a-f]{24}-[0-9a-f]{24}$/
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)
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// Archive logs in background
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if (
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(Settings.clsi != null ? Settings.clsi.archive_logs : undefined) ||
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(Settings.clsi != null ? Settings.clsi.strace : undefined)
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) {
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OutputCacheManager.archiveLogs(
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outputFiles,
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compileDir,
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outputDir,
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buildId,
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function (err) {
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if (err != null) {
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return logger.warn({ err }, 'erroring archiving log files')
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}
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}
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)
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}
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// make the new cache directory
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return fse.ensureDir(cacheDir, function (err) {
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if (err != null) {
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logger.error(
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{ err, directory: cacheDir },
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'error creating cache directory'
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)
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return callback(err, outputFiles)
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} else {
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// copy all the output files into the new cache directory
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const results = []
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return async.mapSeries(
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outputFiles,
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function (file, cb) {
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// don't send dot files as output, express doesn't serve them
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if (OutputCacheManager._fileIsHidden(file.path)) {
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logger.debug(
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{ compileDir, path: file.path },
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'ignoring dotfile in output'
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)
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return cb()
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}
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// copy other files into cache directory if valid
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const newFile = _.clone(file)
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const [src, dst] = Array.from([
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Path.join(compileDir, file.path),
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Path.join(cacheDir, file.path),
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])
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return OutputCacheManager._checkFileIsSafe(
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src,
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function (err, isSafe) {
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if (err != null) {
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return cb(err)
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}
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if (!isSafe) {
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return cb()
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}
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return OutputCacheManager._checkIfShouldCopy(
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src,
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function (err, shouldCopy) {
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if (err != null) {
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return cb(err)
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}
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if (!shouldCopy) {
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return cb()
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}
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return OutputCacheManager._copyFile(
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src,
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dst,
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function (err) {
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if (err != null) {
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return cb(err)
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}
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newFile.build = buildId // attach a build id if we cached the file
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results.push(newFile)
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return cb()
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}
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)
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}
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)
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}
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)
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},
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function (err) {
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if (err != null) {
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// pass back the original files if we encountered *any* error
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callback(err, outputFiles)
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// clean up the directory we just created
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return fse.remove(cacheDir, function (err) {
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if (err != null) {
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return logger.error(
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{ err, dir: cacheDir },
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'error removing cache dir after failure'
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)
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}
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})
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} else {
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// pass back the list of new files in the cache
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callback(err, results)
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// let file expiry run in the background, expire all previous files if per-user
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cleanupDirectory(outputDir, {
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keep: buildId,
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limit: perUser ? 1 : null,
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}).catch(() => {})
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}
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}
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)
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}
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})
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},
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collectOutputPdfSize(outputFiles, outputDir, stats, callback) {
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const outputFile = outputFiles.find(x => x.path === 'output.pdf')
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if (!outputFile) return callback(null, outputFiles)
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const outputFilePath = Path.join(
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outputDir,
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OutputCacheManager.path(outputFile.build, outputFile.path)
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)
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fs.stat(outputFilePath, (err, stat) => {
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if (err) return callback(err, outputFiles)
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outputFile.size = stat.size
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stats['pdf-size'] = outputFile.size
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callback(null, outputFiles)
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})
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},
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saveStreamsInContentDir(
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{ request, stats, timings, enablePdfCachingDark },
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outputFiles,
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compileDir,
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outputDir,
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callback
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) {
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const cacheRoot = Path.join(outputDir, OutputCacheManager.CONTENT_SUBDIR)
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// check if content dir exists
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OutputCacheManager.ensureContentDir(cacheRoot, function (err, contentDir) {
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if (err) return callback(err, 'content-dir-unavailable')
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const outputFile = outputFiles.find(x => x.path === 'output.pdf')
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if (outputFile) {
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// possibly we should copy the file from the build dir here
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const outputFilePath = Path.join(
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outputDir,
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OutputCacheManager.path(outputFile.build, outputFile.path)
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)
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const pdfSize = outputFile.size
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const timer = new Metrics.Timer(
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'compute-pdf-ranges',
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1,
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request.metricsOpts
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)
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ContentCacheManager.update(
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{
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contentDir,
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filePath: outputFilePath,
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pdfSize,
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pdfCachingMinChunkSize: request.pdfCachingMinChunkSize,
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compileTime: timings.compile,
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},
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function (err, result) {
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if (err && err instanceof NoXrefTableError) {
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return callback(null, err.message)
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}
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if (err && err instanceof QueueLimitReachedError) {
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logger.warn({ err, outputDir }, 'pdf caching queue limit reached')
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stats['pdf-caching-queue-limit-reached'] = 1
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return callback(null, 'queue-limit')
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}
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if (err && err instanceof TimedOutError) {
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logger.warn(
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{ err, outputDir, stats, timings },
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'pdf caching timed out'
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)
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stats['pdf-caching-timed-out'] = 1
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return callback(null, 'timed-out')
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}
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if (err) return callback(err, 'failed')
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const {
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contentRanges,
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newContentRanges,
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reclaimedSpace,
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startXRefTable,
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} = result
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if (enablePdfCachingDark) {
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// In dark mode we are doing the computation only and do not emit
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// any ranges to the frontend.
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} else {
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outputFile.contentId = Path.basename(contentDir)
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outputFile.ranges = contentRanges
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outputFile.startXRefTable = startXRefTable
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}
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timings['compute-pdf-caching'] = timer.done()
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stats['pdf-caching-n-ranges'] = contentRanges.length
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stats['pdf-caching-total-ranges-size'] = contentRanges.reduce(
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(sum, next) => sum + (next.end - next.start),
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0
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)
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stats['pdf-caching-n-new-ranges'] = newContentRanges.length
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stats['pdf-caching-new-ranges-size'] = newContentRanges.reduce(
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(sum, next) => sum + (next.end - next.start),
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0
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)
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stats['pdf-caching-reclaimed-space'] = reclaimedSpace
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callback(null, 'success')
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}
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)
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} else {
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callback(null, 'missing-pdf')
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}
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})
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},
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ensureContentDir(contentRoot, callback) {
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fse.ensureDir(contentRoot, function (err) {
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if (err != null) {
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return callback(err)
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}
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fs.readdir(contentRoot, function (err, results) {
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if (err) return callback(err)
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const dirs = results.sort()
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const contentId = dirs.find(dir =>
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OutputCacheManager.BUILD_REGEX.test(dir)
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)
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if (contentId) {
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callback(null, Path.join(contentRoot, contentId))
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} else {
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// make a content directory
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OutputCacheManager.generateBuildId(function (err, contentId) {
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if (err) {
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return callback(err)
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}
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const contentDir = Path.join(contentRoot, contentId)
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fse.ensureDir(contentDir, function (err) {
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if (err) {
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return callback(err)
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}
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return callback(null, contentDir)
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})
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})
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}
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})
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})
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},
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archiveLogs(outputFiles, compileDir, outputDir, buildId, callback) {
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if (callback == null) {
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callback = function () {}
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}
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const archiveDir = Path.join(
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outputDir,
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OutputCacheManager.ARCHIVE_SUBDIR,
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buildId
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)
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logger.debug({ dir: archiveDir }, 'archiving log files for project')
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return fse.ensureDir(archiveDir, function (err) {
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if (err != null) {
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return callback(err)
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}
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return async.mapSeries(
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outputFiles,
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function (file, cb) {
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const [src, dst] = Array.from([
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Path.join(compileDir, file.path),
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Path.join(archiveDir, file.path),
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])
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return OutputCacheManager._checkFileIsSafe(
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src,
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function (err, isSafe) {
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if (err != null) {
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return cb(err)
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}
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if (!isSafe) {
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return cb()
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}
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return OutputCacheManager._checkIfShouldArchive(
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src,
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function (err, shouldArchive) {
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if (err != null) {
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return cb(err)
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}
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if (!shouldArchive) {
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return cb()
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}
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return OutputCacheManager._copyFile(src, dst, cb)
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}
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)
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}
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)
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},
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callback
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)
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})
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},
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expireOutputFiles(outputDir, options, callback) {
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// look in compileDir for build dirs and delete if > N or age of mod time > T
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if (callback == null) {
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callback = function () {}
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}
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const cleanupAll = cb => {
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fse.remove(outputDir, err => {
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if (err) {
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return cb(err)
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}
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// Drop reference after successful cleanup of the output dir.
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OLDEST_BUILD_DIR.delete(outputDir)
|
|
cb(null)
|
|
})
|
|
}
|
|
|
|
const cacheRoot = Path.join(outputDir, OutputCacheManager.CACHE_SUBDIR)
|
|
return fs.readdir(cacheRoot, function (err, results) {
|
|
if (err != null) {
|
|
if (err.code === 'ENOENT') {
|
|
// cache directory is empty
|
|
return cleanupAll(callback)
|
|
}
|
|
logger.error({ err, project_id: cacheRoot }, 'error clearing cache')
|
|
return callback(err)
|
|
}
|
|
|
|
const dirs = results.sort().reverse()
|
|
const currentTime = Date.now()
|
|
|
|
let oldestDirTimeToKeep = 0
|
|
|
|
const isExpired = function (dir, index) {
|
|
if ((options != null ? options.keep : undefined) === dir) {
|
|
// This is the directory we just created for the compile request.
|
|
oldestDirTimeToKeep = currentTime
|
|
return false
|
|
}
|
|
// remove any directories over the requested (non-null) limit
|
|
if (
|
|
(options != null ? options.limit : undefined) != null &&
|
|
index > options.limit
|
|
) {
|
|
return true
|
|
}
|
|
// remove any directories over the hard limit
|
|
if (index > OutputCacheManager.CACHE_LIMIT) {
|
|
return true
|
|
}
|
|
// we can get the build time from the first part of the directory name DDDD-RRRR
|
|
// DDDD is date and RRRR is random bytes
|
|
const dirTime = parseInt(
|
|
__guard__(dir.split('-'), x => x[0]),
|
|
16
|
|
)
|
|
const age = currentTime - dirTime
|
|
const expired = age > OutputCacheManager.CACHE_AGE
|
|
if (expired) {
|
|
return true
|
|
}
|
|
oldestDirTimeToKeep = dirTime
|
|
return false
|
|
}
|
|
|
|
const toRemove = _.filter(dirs, isExpired)
|
|
if (toRemove.length === dirs.length) {
|
|
// No builds left after cleanup.
|
|
return cleanupAll(callback)
|
|
}
|
|
|
|
const removeDir = (dir, cb) =>
|
|
fse.remove(Path.join(cacheRoot, dir), function (err, result) {
|
|
logger.debug({ cache: cacheRoot, dir }, 'removed expired cache dir')
|
|
if (err != null) {
|
|
logger.error({ err, dir }, 'cache remove error')
|
|
}
|
|
return cb(err, result)
|
|
})
|
|
return async.eachSeries(
|
|
toRemove,
|
|
(dir, cb) => removeDir(dir, cb),
|
|
err => {
|
|
if (err) {
|
|
// On error: keep the timestamp in the past.
|
|
// The next iteration of the cleanup loop will retry the deletion.
|
|
return callback(err)
|
|
}
|
|
// On success: push the timestamp into the future.
|
|
OLDEST_BUILD_DIR.set(outputDir, oldestDirTimeToKeep)
|
|
callback(null)
|
|
}
|
|
)
|
|
})
|
|
},
|
|
|
|
_fileIsHidden(path) {
|
|
return (path != null ? path.match(/^\.|\/\./) : undefined) != null
|
|
},
|
|
|
|
_checkFileIsSafe(src, callback) {
|
|
// check if we have a valid file to copy into the cache
|
|
if (callback == null) {
|
|
callback = function () {}
|
|
}
|
|
return fs.stat(src, function (err, stats) {
|
|
if ((err != null ? err.code : undefined) === 'ENOENT') {
|
|
logger.warn(
|
|
{ err, file: src },
|
|
'file has disappeared before copying to build cache'
|
|
)
|
|
return callback(err, false)
|
|
} else if (err != null) {
|
|
// some other problem reading the file
|
|
logger.error({ err, file: src }, 'stat error for file in cache')
|
|
return callback(err, false)
|
|
} else if (!stats.isFile()) {
|
|
// other filetype - reject it
|
|
logger.warn(
|
|
{ src, stat: stats },
|
|
'nonfile output - refusing to copy to cache'
|
|
)
|
|
return callback(null, false)
|
|
} else {
|
|
// it's a plain file, ok to copy
|
|
return callback(null, true)
|
|
}
|
|
})
|
|
},
|
|
|
|
_copyFile(src, dst, callback) {
|
|
// copy output file into the cache
|
|
return fse.copy(src, dst, function (err) {
|
|
if ((err != null ? err.code : undefined) === 'ENOENT') {
|
|
logger.warn(
|
|
{ err, file: src },
|
|
'file has disappeared when copying to build cache'
|
|
)
|
|
return callback(err, false)
|
|
} else if (err != null) {
|
|
logger.error({ err, src, dst }, 'copy error for file in cache')
|
|
return callback(err)
|
|
} else {
|
|
if (
|
|
Settings.clsi != null ? Settings.clsi.optimiseInDocker : undefined
|
|
) {
|
|
// don't run any optimisations on the pdf when they are done
|
|
// in the docker container
|
|
return callback()
|
|
} else {
|
|
// call the optimiser for the file too
|
|
return OutputFileOptimiser.optimiseFile(src, dst, callback)
|
|
}
|
|
}
|
|
})
|
|
},
|
|
|
|
_checkIfShouldCopy(src, callback) {
|
|
if (callback == null) {
|
|
callback = function () {}
|
|
}
|
|
return callback(null, !Path.basename(src).match(/^strace/))
|
|
},
|
|
|
|
_checkIfShouldArchive(src, callback) {
|
|
let needle
|
|
if (callback == null) {
|
|
callback = function () {}
|
|
}
|
|
if (Path.basename(src).match(/^strace/)) {
|
|
return callback(null, true)
|
|
}
|
|
if (
|
|
(Settings.clsi != null ? Settings.clsi.archive_logs : undefined) &&
|
|
((needle = Path.basename(src)),
|
|
['output.log', 'output.blg'].includes(needle))
|
|
) {
|
|
return callback(null, true)
|
|
}
|
|
return callback(null, false)
|
|
},
|
|
}
|
|
|
|
function __guard__(value, transform) {
|
|
return typeof value !== 'undefined' && value !== null
|
|
? transform(value)
|
|
: undefined
|
|
}
|
|
|
|
OutputCacheManager.promises = {
|
|
expireOutputFiles: promisify(OutputCacheManager.expireOutputFiles),
|
|
saveOutputFiles: promisify(OutputCacheManager.saveOutputFiles),
|
|
saveOutputFilesInBuildDir: promisify(
|
|
OutputCacheManager.saveOutputFilesInBuildDir
|
|
),
|
|
}
|