overleaf/services/document-updater/app/js/RangesManager.js

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// 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 RangesManager
const RangesTracker = require('@overleaf/ranges-tracker')
const logger = require('@overleaf/logger')
const Metrics = require('./Metrics')
const _ = require('lodash')
const RANGE_DELTA_BUCKETS = [0, 1, 2, 3, 4, 5, 10, 20, 50]
module.exports = RangesManager = {
MAX_COMMENTS: 500,
MAX_CHANGES: 2000,
applyUpdate(projectId, docId, entries, updates, newDocLines, callback) {
let error
if (entries == null) {
entries = {}
}
if (updates == null) {
updates = []
}
if (callback == null) {
callback = function () {}
}
const { changes, comments } = _.cloneDeep(entries)
const rangesTracker = new RangesTracker(changes, comments)
const [emptyRangeCountBefore, totalRangeCountBefore] =
RangesManager._emptyRangesCount(rangesTracker)
for (const update of Array.from(updates)) {
rangesTracker.track_changes = !!update.meta.tc
if (update.meta.tc) {
rangesTracker.setIdSeed(update.meta.tc)
}
for (const op of Array.from(update.op)) {
try {
rangesTracker.applyOp(op, {
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user_id: update.meta != null ? update.meta.user_id : undefined,
})
} catch (error1) {
error = error1
return callback(error)
}
}
}
if (
(rangesTracker.changes != null
? rangesTracker.changes.length
: undefined) > RangesManager.MAX_CHANGES ||
(rangesTracker.comments != null
? rangesTracker.comments.length
: undefined) > RangesManager.MAX_COMMENTS
) {
return callback(new Error('too many comments or tracked changes'))
}
try {
// This is a consistency check that all of our ranges and
// comments still match the corresponding text
rangesTracker.validate(newDocLines.join('\n'))
} catch (error2) {
error = error2
logger.error(
{ err: error, projectId, docId, newDocLines, updates },
'error validating ranges'
)
return callback(error)
}
const [emptyRangeCountAfter, totalRangeCountAfter] =
RangesManager._emptyRangesCount(rangesTracker)
const rangesWereCollapsed =
emptyRangeCountAfter > emptyRangeCountBefore ||
totalRangeCountAfter + 1 < totalRangeCountBefore // also include the case where multiple ranges were removed
// monitor the change in range count, we may want to snapshot before large decreases
if (totalRangeCountAfter < totalRangeCountBefore) {
Metrics.histogram(
'range-delta',
totalRangeCountBefore - totalRangeCountAfter,
RANGE_DELTA_BUCKETS,
{ status_code: rangesWereCollapsed ? 'saved' : 'unsaved' }
)
}
const response = RangesManager._getRanges(rangesTracker)
logger.debug(
{
projectId,
docId,
changesCount:
response.changes != null ? response.changes.length : undefined,
commentsCount:
response.comments != null ? response.comments.length : undefined,
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rangesWereCollapsed,
},
'applied updates to ranges'
)
return callback(null, response, rangesWereCollapsed)
},
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acceptChanges(changeIds, ranges, callback) {
if (callback == null) {
callback = function () {}
}
const { changes, comments } = ranges
logger.debug(`accepting ${changeIds.length} changes in ranges`)
const rangesTracker = new RangesTracker(changes, comments)
rangesTracker.removeChangeIds(changeIds)
const response = RangesManager._getRanges(rangesTracker)
return callback(null, response)
},
deleteComment(commentId, ranges, callback) {
if (callback == null) {
callback = function () {}
}
const { changes, comments } = ranges
logger.debug({ commentId }, 'deleting comment in ranges')
const rangesTracker = new RangesTracker(changes, comments)
rangesTracker.removeCommentId(commentId)
const response = RangesManager._getRanges(rangesTracker)
return callback(null, response)
},
_getRanges(rangesTracker) {
// Return the minimal data structure needed, since most documents won't have any
// changes or comments
let response = {}
if (
(rangesTracker.changes != null
? rangesTracker.changes.length
: undefined) > 0
) {
if (response == null) {
response = {}
}
response.changes = rangesTracker.changes
}
if (
(rangesTracker.comments != null
? rangesTracker.comments.length
: undefined) > 0
) {
if (response == null) {
response = {}
}
response.comments = rangesTracker.comments
}
return response
},
_emptyRangesCount(ranges) {
let emptyCount = 0
let totalCount = 0
for (const comment of Array.from(ranges.comments || [])) {
totalCount++
if (comment.op.c === '') {
emptyCount++
}
}
for (const change of Array.from(ranges.changes || [])) {
totalCount++
if (change.op.i != null) {
if (change.op.i === '') {
emptyCount++
}
}
}
return [emptyCount, totalCount]
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},
}