overleaf/services/docstore/app/js/DocManager.js

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const MongoManager = require('./MongoManager')
const Errors = require('./Errors')
const logger = require('@overleaf/logger')
const _ = require('lodash')
const DocArchive = require('./DocArchiveManager')
const RangeManager = require('./RangeManager')
const Settings = require('@overleaf/settings')
const { callbackifyAll } = require('@overleaf/promise-utils')
const { setTimeout } = require('timers/promises')
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/**
* @typedef {import('mongodb').Document} Document
* @typedef {import('mongodb').WithId} WithId
*/
const DocManager = {
/**
* @param {string} projectId
* @param {string} docId
* @param {{inS3: boolean}} filter
* @returns {Promise<WithId<Document>>}
* @private
*/
async _getDoc(projectId, docId, filter) {
if (filter == null) {
filter = {}
}
if (filter.inS3 !== true) {
throw new Error('must include inS3 when getting doc')
}
const doc = await MongoManager.promises.findDoc(projectId, docId, filter)
if (doc == null) {
throw new Errors.NotFoundError(
`No such doc: ${docId} in project ${projectId}`
)
}
if (doc.inS3) {
await DocArchive.promises.unarchiveDoc(projectId, docId)
return await DocManager._getDoc(projectId, docId, filter)
}
return doc
},
async isDocDeleted(projectId, docId) {
const doc = await MongoManager.promises.findDoc(projectId, docId, {
deleted: true,
})
if (!doc) {
throw new Errors.NotFoundError(
`No such project/doc: ${projectId}/${docId}`
)
}
// `doc.deleted` is `undefined` for non deleted docs
return Boolean(doc.deleted)
},
async getFullDoc(projectId, docId) {
const doc = await DocManager._getDoc(projectId, docId, {
lines: true,
rev: true,
deleted: true,
version: true,
ranges: true,
inS3: true,
})
return doc
},
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// returns the doc without any version information
async _peekRawDoc(projectId, docId) {
const doc = await MongoManager.promises.findDoc(projectId, docId, {
lines: true,
rev: true,
deleted: true,
version: true,
ranges: true,
inS3: true,
})
if (doc == null) {
throw new Errors.NotFoundError(
`No such doc: ${docId} in project ${projectId}`
)
}
if (doc.inS3) {
// skip the unarchiving to mongo when getting a doc
const archivedDoc = await DocArchive.promises.getDoc(projectId, docId)
Object.assign(doc, archivedDoc)
}
return doc
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},
// get the doc from mongo if possible, or from the persistent store otherwise,
// without unarchiving it (avoids unnecessary writes to mongo)
async peekDoc(projectId, docId) {
const doc = await DocManager._peekRawDoc(projectId, docId)
await MongoManager.promises.checkRevUnchanged(doc)
return doc
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},
async getDocLines(projectId, docId) {
const doc = await DocManager._getDoc(projectId, docId, {
lines: true,
inS3: true,
})
return doc
},
async getAllDeletedDocs(projectId, filter) {
return await MongoManager.promises.getProjectsDeletedDocs(projectId, filter)
},
async getAllNonDeletedDocs(projectId, filter) {
await DocArchive.promises.unArchiveAllDocs(projectId)
const docs = await MongoManager.promises.getProjectsDocs(
projectId,
{ include_deleted: false },
filter
)
if (docs == null) {
throw new Errors.NotFoundError(`No docs for project ${projectId}`)
}
return docs
},
async updateDoc(projectId, docId, lines, version, ranges) {
const MAX_ATTEMPTS = 2
for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {
try {
const { modified, rev } = await DocManager._tryUpdateDoc(
projectId,
docId,
lines,
version,
ranges
)
return { modified, rev }
} catch (err) {
if (err instanceof Errors.DocRevValueError && attempt < MAX_ATTEMPTS) {
// Another updateDoc call was racing with ours.
// Retry once in a bit.
logger.warn(
{ projectId, docId, err },
'detected concurrent updateDoc call'
)
await setTimeout(100 + Math.random() * 100)
continue
} else {
throw err
}
}
}
},
async _tryUpdateDoc(projectId, docId, lines, version, ranges) {
if (lines == null || version == null || ranges == null) {
throw new Error('no lines, version or ranges provided')
}
let doc
try {
doc = await DocManager._getDoc(projectId, docId, {
version: true,
rev: true,
lines: true,
ranges: true,
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inS3: true,
})
} catch (err) {
if (err instanceof Errors.NotFoundError) {
doc = null
} else {
throw err
}
}
ranges = RangeManager.jsonRangesToMongo(ranges)
let updateLines, updateRanges, updateVersion
if (doc == null) {
// If the document doesn't exist, we'll make sure to create/update all parts of it.
updateLines = true
updateVersion = true
updateRanges = true
} else {
if (doc.version > version) {
// Reject update when the version was decremented.
// Potential reasons: racing flush, broken history.
throw new Errors.DocVersionDecrementedError('rejecting stale update', {
updateVersion: version,
flushedVersion: doc.version,
})
}
updateLines = !_.isEqual(doc.lines, lines)
updateVersion = doc.version !== version
updateRanges = RangeManager.shouldUpdateRanges(doc.ranges, ranges)
}
let modified = false
let rev = doc?.rev || 0
if (updateLines || updateRanges || updateVersion) {
const update = {}
if (updateLines) {
update.lines = lines
}
if (updateRanges) {
update.ranges = ranges
}
if (updateVersion) {
update.version = version
}
logger.debug(
{ projectId, docId, oldVersion: doc?.version, newVersion: version },
'updating doc'
)
if (updateLines || updateRanges) {
rev += 1 // rev will be incremented in mongo by MongoManager.upsertIntoDocCollection
}
modified = true
await MongoManager.promises.upsertIntoDocCollection(
projectId,
docId,
doc?.rev,
update
)
} else {
logger.debug({ projectId, docId }, 'doc has not changed - not updating')
}
return { modified, rev }
},
async patchDoc(projectId, docId, meta) {
const projection = { _id: 1, deleted: true }
const doc = await MongoManager.promises.findDoc(
projectId,
docId,
projection
)
if (!doc) {
throw new Errors.NotFoundError(
`No such project/doc to delete: ${projectId}/${docId}`
)
}
if (meta.deleted && Settings.docstore.archiveOnSoftDelete) {
// The user will not read this doc anytime soon. Flush it out of mongo.
DocArchive.promises.archiveDoc(projectId, docId).catch(err => {
logger.warn(
{ projectId, docId, err },
'archiving a single doc in the background failed'
)
})
}
await MongoManager.promises.patchDoc(projectId, docId, meta)
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},
}
module.exports = {
...callbackifyAll(DocManager, {
multiResult: {
updateDoc: ['modified', 'rev'],
},
}),
promises: DocManager,
}