overleaf/services/clsi/app/js/UrlCache.js

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/* eslint-disable
camelcase,
handle-callback-err,
no-return-assign,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS101: Remove unnecessary use of Array.from
* DS102: Remove unnecessary code created because of implicit returns
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
let UrlCache
const db = require('./db')
const dbQueue = require('./DbQueue')
const UrlFetcher = require('./UrlFetcher')
const Settings = require('settings-sharelatex')
const crypto = require('crypto')
const fs = require('fs')
const logger = require('logger-sharelatex')
const async = require('async')
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module.exports = UrlCache = {
downloadUrlToFile(project_id, url, destPath, lastModified, callback) {
if (callback == null) {
callback = function(error) {}
}
return UrlCache._ensureUrlIsInCache(
project_id,
url,
lastModified,
(error, pathToCachedUrl) => {
if (error != null) {
return callback(error)
}
return UrlCache._copyFile(pathToCachedUrl, destPath, function(error) {
if (error != null) {
return UrlCache._clearUrlDetails(project_id, url, () =>
callback(error)
)
} else {
return callback(error)
}
})
}
)
},
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clearProject(project_id, callback) {
if (callback == null) {
callback = function(error) {}
}
return UrlCache._findAllUrlsInProject(project_id, function(error, urls) {
logger.log(
{ project_id, url_count: urls.length },
'clearing project URLs'
)
if (error != null) {
return callback(error)
}
const jobs = Array.from(urls || []).map(url =>
(url => callback =>
UrlCache._clearUrlFromCache(project_id, url, function(error) {
if (error != null) {
logger.error(
{ err: error, project_id, url },
'error clearing project URL'
)
}
return callback()
}))(url)
)
return async.series(jobs, callback)
})
},
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_ensureUrlIsInCache(project_id, url, lastModified, callback) {
if (callback == null) {
callback = function(error, pathOnDisk) {}
}
if (lastModified != null) {
// MYSQL only stores dates to an accuracy of a second but the incoming lastModified might have milliseconds.
// So round down to seconds
lastModified = new Date(Math.floor(lastModified.getTime() / 1000) * 1000)
}
return UrlCache._doesUrlNeedDownloading(
project_id,
url,
lastModified,
(error, needsDownloading) => {
if (error != null) {
return callback(error)
}
if (needsDownloading) {
logger.log({ url, lastModified }, 'downloading URL')
return UrlFetcher.pipeUrlToFile(
url,
UrlCache._cacheFilePathForUrl(project_id, url),
error => {
if (error != null) {
return callback(error)
}
return UrlCache._updateOrCreateUrlDetails(
project_id,
url,
lastModified,
error => {
if (error != null) {
return callback(error)
}
return callback(
null,
UrlCache._cacheFilePathForUrl(project_id, url)
)
}
)
}
)
} else {
logger.log({ url, lastModified }, 'URL is up to date in cache')
return callback(null, UrlCache._cacheFilePathForUrl(project_id, url))
}
}
)
},
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_doesUrlNeedDownloading(project_id, url, lastModified, callback) {
if (callback == null) {
callback = function(error, needsDownloading) {}
}
if (lastModified == null) {
return callback(null, true)
}
return UrlCache._findUrlDetails(project_id, url, function(
error,
urlDetails
) {
if (error != null) {
return callback(error)
}
if (
urlDetails == null ||
urlDetails.lastModified == null ||
urlDetails.lastModified.getTime() < lastModified.getTime()
) {
return callback(null, true)
} else {
return callback(null, false)
}
})
},
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_cacheFileNameForUrl(project_id, url) {
return (
project_id +
':' +
crypto
.createHash('md5')
.update(url)
.digest('hex')
)
},
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_cacheFilePathForUrl(project_id, url) {
return `${Settings.path.clsiCacheDir}/${UrlCache._cacheFileNameForUrl(
project_id,
url
)}`
},
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_copyFile(from, to, _callback) {
if (_callback == null) {
_callback = function(error) {}
}
const callbackOnce = function(error) {
if (error != null) {
logger.error({ err: error, from, to }, 'error copying file from cache')
}
_callback(error)
return (_callback = function() {})
}
const writeStream = fs.createWriteStream(to)
const readStream = fs.createReadStream(from)
writeStream.on('error', callbackOnce)
readStream.on('error', callbackOnce)
writeStream.on('close', callbackOnce)
return writeStream.on('open', () => readStream.pipe(writeStream))
},
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_clearUrlFromCache(project_id, url, callback) {
if (callback == null) {
callback = function(error) {}
}
return UrlCache._clearUrlDetails(project_id, url, function(error) {
if (error != null) {
return callback(error)
}
return UrlCache._deleteUrlCacheFromDisk(project_id, url, function(error) {
if (error != null) {
return callback(error)
}
return callback(null)
})
})
},
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_deleteUrlCacheFromDisk(project_id, url, callback) {
if (callback == null) {
callback = function(error) {}
}
return fs.unlink(UrlCache._cacheFilePathForUrl(project_id, url), function(
error
) {
if (error != null && error.code !== 'ENOENT') {
// no error if the file isn't present
return callback(error)
} else {
return callback()
}
})
},
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_findUrlDetails(project_id, url, callback) {
if (callback == null) {
callback = function(error, urlDetails) {}
}
const job = cb =>
db.UrlCache.find({ where: { url, project_id } })
.then(urlDetails => cb(null, urlDetails))
.error(cb)
return dbQueue.queue.push(job, callback)
},
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_updateOrCreateUrlDetails(project_id, url, lastModified, callback) {
if (callback == null) {
callback = function(error) {}
}
const job = cb =>
db.UrlCache.findOrCreate({ where: { url, project_id } })
.spread((urlDetails, created) =>
urlDetails
.updateAttributes({ lastModified })
.then(() => cb())
.error(cb)
)
.error(cb)
return dbQueue.queue.push(job, callback)
},
_clearUrlDetails(project_id, url, callback) {
if (callback == null) {
callback = function(error) {}
}
const job = cb =>
db.UrlCache.destroy({ where: { url, project_id } })
.then(() => cb(null))
.error(cb)
return dbQueue.queue.push(job, callback)
},
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_findAllUrlsInProject(project_id, callback) {
if (callback == null) {
callback = function(error, urls) {}
}
const job = cb =>
db.UrlCache.findAll({ where: { project_id } })
.then(urlEntries =>
cb(
null,
urlEntries.map(entry => entry.url)
)
)
.error(cb)
return dbQueue.queue.push(job, callback)
}
}