mirror of
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125 lines
4.8 KiB
CoffeeScript
125 lines
4.8 KiB
CoffeeScript
db = require("./db")
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UrlFetcher = require("./UrlFetcher")
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Settings = require("settings-sharelatex")
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crypto = require("crypto")
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fs = require("fs")
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logger = require "logger-sharelatex"
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async = require "async"
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module.exports = UrlCache =
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downloadUrlToFile: (project_id, url, destPath, lastModified, callback = (error) ->) ->
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UrlCache._ensureUrlIsInCache project_id, url, lastModified, (error, pathToCachedUrl) =>
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return callback(error) if error?
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UrlCache._copyFile pathToCachedUrl, destPath, (error) ->
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if error?
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UrlCache._clearUrlDetails project_id, url, () ->
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callback(error)
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else
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callback(error)
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clearProject: (project_id, callback = (error) ->) ->
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UrlCache._findAllUrlsInProject project_id, (error, urls) ->
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logger.log project_id: project_id, url_count: urls.length, "clearing project URLs"
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return callback(error) if error?
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jobs = for url in (urls or [])
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do (url) ->
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(callback) ->
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UrlCache._clearUrlFromCache project_id, url, (error) ->
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if error?
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logger.error err: error, project_id: project_id, url: url, "error clearing project URL"
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callback()
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async.series jobs, callback
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_ensureUrlIsInCache: (project_id, url, lastModified, callback = (error, pathOnDisk) ->) ->
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if lastModified?
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# MYSQL only stores dates to an accuracy of a second but the incoming lastModified might have milliseconds.
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# So round down to seconds
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lastModified = new Date(Math.floor(lastModified.getTime() / 1000) * 1000)
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UrlCache._doesUrlNeedDownloading project_id, url, lastModified, (error, needsDownloading) =>
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return callback(error) if error?
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if needsDownloading
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logger.log url: url, lastModified: lastModified, "downloading URL"
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UrlFetcher.pipeUrlToFile url, UrlCache._cacheFilePathForUrl(project_id, url), (error) =>
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return callback(error) if error?
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UrlCache._updateOrCreateUrlDetails project_id, url, lastModified, (error) =>
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return callback(error) if error?
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callback null, UrlCache._cacheFilePathForUrl(project_id, url)
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else
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logger.log url: url, lastModified: lastModified, "URL is up to date in cache"
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callback null, UrlCache._cacheFilePathForUrl(project_id, url)
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_doesUrlNeedDownloading: (project_id, url, lastModified, callback = (error, needsDownloading) ->) ->
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if !lastModified?
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return callback null, true
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UrlCache._findUrlDetails project_id, url, (error, urlDetails) ->
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return callback(error) if error?
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if !urlDetails? or !urlDetails.lastModified? or urlDetails.lastModified.getTime() < lastModified.getTime()
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return callback null, true
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else
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return callback null, false
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_cacheFileNameForUrl: (project_id, url) ->
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project_id + ":" + crypto.createHash("md5").update(url).digest("hex")
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_cacheFilePathForUrl: (project_id, url) ->
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"#{Settings.path.clsiCacheDir}/#{UrlCache._cacheFileNameForUrl(project_id, url)}"
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_copyFile: (from, to, _callback = (error) ->) ->
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callbackOnce = (error) ->
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if error?
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logger.error err: error, from:from, to:to, "error copying file from cache"
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_callback(error)
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_callback = () ->
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writeStream = fs.createWriteStream(to)
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readStream = fs.createReadStream(from)
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writeStream.on "error", callbackOnce
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readStream.on "error", callbackOnce
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writeStream.on "close", callbackOnce
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writeStream.on "open", () ->
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readStream.pipe(writeStream)
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_clearUrlFromCache: (project_id, url, callback = (error) ->) ->
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UrlCache._clearUrlDetails project_id, url, (error) ->
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return callback(error) if error?
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UrlCache._deleteUrlCacheFromDisk project_id, url, (error) ->
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return callback(error) if error?
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callback null
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_deleteUrlCacheFromDisk: (project_id, url, callback = (error) ->) ->
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fs.unlink UrlCache._cacheFilePathForUrl(project_id, url), (error) ->
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if error? and error.code != 'ENOENT' # no error if the file isn't present
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return callback(error)
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else
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return callback()
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_findUrlDetails: (project_id, url, callback = (error, urlDetails) ->) ->
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db.UrlCache.find(where: { url: url, project_id: project_id })
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.then((urlDetails) -> callback null, urlDetails)
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.error callback
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_updateOrCreateUrlDetails: (project_id, url, lastModified, callback = (error) ->) ->
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db.UrlCache.findOrCreate(where: {url: url, project_id: project_id})
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.spread(
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(urlDetails, created) ->
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urlDetails.updateAttributes(lastModified: lastModified)
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.then(() -> callback())
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.error(callback)
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)
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.error callback
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_clearUrlDetails: (project_id, url, callback = (error) ->) ->
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db.UrlCache.destroy(where: {url: url, project_id: project_id})
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.then(() -> callback null)
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.error callback
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_findAllUrlsInProject: (project_id, callback = (error, urls) ->) ->
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db.UrlCache.findAll(where: { project_id: project_id })
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.then(
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(urlEntries) ->
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callback null, urlEntries.map((entry) -> entry.url)
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)
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.error callback
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