mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-29 19:53:41 -05:00
493 lines
15 KiB
JavaScript
493 lines
15 KiB
JavaScript
// @ts-check
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const RangesTracker = require('@overleaf/ranges-tracker')
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const logger = require('@overleaf/logger')
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const OError = require('@overleaf/o-error')
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const Metrics = require('./Metrics')
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const _ = require('lodash')
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const { isInsert, isDelete, isComment, getDocLength } = require('./Utils')
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/**
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* @typedef {import('./types').Comment} Comment
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* @typedef {import('./types').CommentOp} CommentOp
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* @typedef {import('./types').DeleteOp} DeleteOp
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* @typedef {import('./types').HistoryCommentOp} HistoryCommentOp
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* @typedef {import('./types').HistoryDeleteOp} HistoryDeleteOp
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* @typedef {import('./types').HistoryDeleteTrackedChange} HistoryDeleteTrackedChange
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* @typedef {import('./types').HistoryInsertOp} HistoryInsertOp
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* @typedef {import('./types').HistoryRetainOp} HistoryRetainOp
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* @typedef {import('./types').HistoryOp} HistoryOp
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* @typedef {import('./types').HistoryUpdate} HistoryUpdate
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* @typedef {import('./types').InsertOp} InsertOp
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* @typedef {import('./types').Op} Op
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* @typedef {import('./types').Ranges} Ranges
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* @typedef {import('./types').TrackedChange} TrackedChange
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* @typedef {import('./types').Update} Update
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*/
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const RANGE_DELTA_BUCKETS = [0, 1, 2, 3, 4, 5, 10, 20, 50]
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const RangesManager = {
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MAX_COMMENTS: 500,
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MAX_CHANGES: 2000,
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/**
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* Apply an update to the given doc (lines and ranges) and return new ranges
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*
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* @param {string} projectId
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* @param {string} docId
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* @param {Ranges} ranges - ranges before the updates were applied
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* @param {Update[]} updates
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* @param {string[]} newDocLines - the document lines after the updates were applied
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* @param {object} opts
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* @param {boolean} [opts.historyRangesSupport] - whether history ranges support is enabled
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* @returns {{ newRanges: Ranges, rangesWereCollapsed: boolean, historyUpdates: HistoryUpdate[] }}
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*/
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applyUpdate(projectId, docId, ranges, updates, newDocLines, opts = {}) {
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if (ranges == null) {
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ranges = {}
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}
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if (updates == null) {
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updates = []
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}
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const { changes, comments } = _.cloneDeep(ranges)
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const rangesTracker = new RangesTracker(changes, comments)
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const [emptyRangeCountBefore, totalRangeCountBefore] =
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RangesManager._emptyRangesCount(rangesTracker)
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const historyUpdates = []
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for (const update of updates) {
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rangesTracker.track_changes = Boolean(update.meta?.tc)
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if (update.meta?.tc) {
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rangesTracker.setIdSeed(update.meta.tc)
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}
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const historyOps = []
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for (const op of update.op) {
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if (opts.historyRangesSupport) {
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historyOps.push(
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getHistoryOp(op, rangesTracker.comments, rangesTracker.changes)
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)
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} else if (isInsert(op) || isDelete(op)) {
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historyOps.push(op)
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}
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rangesTracker.applyOp(op, { user_id: update.meta?.user_id })
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}
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if (historyOps.length > 0) {
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historyUpdates.push({ ...update, op: historyOps })
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}
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}
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if (
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rangesTracker.changes?.length > RangesManager.MAX_CHANGES ||
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rangesTracker.comments?.length > RangesManager.MAX_COMMENTS
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) {
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throw new Error('too many comments or tracked changes')
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}
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try {
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// This is a consistency check that all of our ranges and
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// comments still match the corresponding text
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rangesTracker.validate(newDocLines.join('\n'))
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} catch (err) {
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logger.error(
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{ err, projectId, docId, newDocLines, updates },
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'error validating ranges'
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)
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throw err
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}
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const [emptyRangeCountAfter, totalRangeCountAfter] =
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RangesManager._emptyRangesCount(rangesTracker)
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const rangesWereCollapsed =
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emptyRangeCountAfter > emptyRangeCountBefore ||
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totalRangeCountAfter + 1 < totalRangeCountBefore // also include the case where multiple ranges were removed
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// monitor the change in range count, we may want to snapshot before large decreases
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if (totalRangeCountAfter < totalRangeCountBefore) {
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Metrics.histogram(
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'range-delta',
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totalRangeCountBefore - totalRangeCountAfter,
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RANGE_DELTA_BUCKETS,
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{ status_code: rangesWereCollapsed ? 'saved' : 'unsaved' }
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)
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}
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const newRanges = RangesManager._getRanges(rangesTracker)
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logger.debug(
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{
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projectId,
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docId,
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changesCount: newRanges.changes?.length,
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commentsCount: newRanges.comments?.length,
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rangesWereCollapsed,
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},
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'applied updates to ranges'
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)
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return { newRanges, rangesWereCollapsed, historyUpdates }
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},
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acceptChanges(changeIds, ranges) {
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const { changes, comments } = ranges
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logger.debug(`accepting ${changeIds.length} changes in ranges`)
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const rangesTracker = new RangesTracker(changes, comments)
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rangesTracker.removeChangeIds(changeIds)
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const newRanges = RangesManager._getRanges(rangesTracker)
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return newRanges
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},
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deleteComment(commentId, ranges) {
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const { changes, comments } = ranges
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logger.debug({ commentId }, 'deleting comment in ranges')
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const rangesTracker = new RangesTracker(changes, comments)
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rangesTracker.removeCommentId(commentId)
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const newRanges = RangesManager._getRanges(rangesTracker)
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return newRanges
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},
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/**
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*
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* @param {object} args
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* @param {string} args.docId
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* @param {string[]} args.acceptedChangeIds
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* @param {TrackedChange[]} args.changes
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* @param {string} args.pathname
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* @param {string} args.projectHistoryId
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* @param {string[]} args.lines
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*/
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getHistoryUpdatesForAcceptedChanges({
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docId,
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acceptedChangeIds,
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changes,
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pathname,
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projectHistoryId,
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lines,
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}) {
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/** @type {(change: TrackedChange) => boolean} */
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const isAccepted = change => acceptedChangeIds.includes(change.id)
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const historyOps = []
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// Keep ops in order of offset, with deletes before inserts
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const sortedChanges = changes.slice().sort(function (c1, c2) {
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const result = c1.op.p - c2.op.p
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if (result !== 0) {
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return result
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} else if (isInsert(c1.op) && isDelete(c2.op)) {
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return 1
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} else if (isDelete(c1.op) && isInsert(c2.op)) {
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return -1
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} else {
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return 0
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}
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})
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const docLength = getDocLength(lines)
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let historyDocLength = docLength
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for (const change of sortedChanges) {
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if (isDelete(change.op)) {
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historyDocLength += change.op.d.length
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}
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}
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let unacceptedDeletes = 0
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for (const change of sortedChanges) {
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/** @type {HistoryOp | undefined} */
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let op
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if (isDelete(change.op)) {
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if (isAccepted(change)) {
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op = {
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p: change.op.p,
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d: change.op.d,
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}
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if (unacceptedDeletes > 0) {
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op.hpos = op.p + unacceptedDeletes
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}
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} else {
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unacceptedDeletes += change.op.d.length
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}
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} else if (isInsert(change.op)) {
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if (isAccepted(change)) {
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op = {
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p: change.op.p,
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r: change.op.i,
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tracking: {
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type: 'none',
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userId: change.metadata.user_id,
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ts: change.metadata.ts,
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},
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}
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if (unacceptedDeletes > 0) {
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op.hpos = op.p + unacceptedDeletes
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}
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}
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}
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if (!op) {
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continue
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}
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/** @type {HistoryUpdate} */
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const historyOp = {
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doc: docId,
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op: [op],
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meta: {
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...change.metadata,
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doc_length: docLength,
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pathname,
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},
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}
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if (projectHistoryId) {
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historyOp.projectHistoryId = projectHistoryId
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}
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if (historyOp.meta && historyDocLength !== docLength) {
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historyOp.meta.history_doc_length = historyDocLength
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}
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historyOps.push(historyOp)
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if (isDelete(change.op) && isAccepted(change)) {
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historyDocLength -= change.op.d.length
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}
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}
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return historyOps
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},
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_getRanges(rangesTracker) {
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// Return the minimal data structure needed, since most documents won't have any
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// changes or comments
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const response = {}
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if (rangesTracker.changes != null && rangesTracker.changes.length > 0) {
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response.changes = rangesTracker.changes
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}
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if (rangesTracker.comments != null && rangesTracker.comments.length > 0) {
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response.comments = rangesTracker.comments
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}
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return response
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},
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_emptyRangesCount(ranges) {
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let emptyCount = 0
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let totalCount = 0
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for (const comment of ranges.comments || []) {
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totalCount++
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if (comment.op.c === '') {
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emptyCount++
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}
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}
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for (const change of ranges.changes || []) {
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totalCount++
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if (change.op.i != null) {
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if (change.op.i === '') {
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emptyCount++
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}
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}
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}
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return [emptyCount, totalCount]
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},
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}
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/**
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* Calculate ops to be sent to the history system.
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*
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* @param {Op} op - the editor op
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* @param {TrackedChange[]} changes - the list of tracked changes in the
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* document before the op is applied. That list, coming from
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* RangesTracker is ordered by position.
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* @returns {HistoryOp}
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*/
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function getHistoryOp(op, comments, changes, opts = {}) {
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if (isInsert(op)) {
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return getHistoryOpForInsert(op, comments, changes)
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} else if (isDelete(op)) {
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return getHistoryOpForDelete(op, changes)
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} else if (isComment(op)) {
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return getHistoryOpForComment(op, changes)
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} else {
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throw new OError('Unrecognized op', { op })
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}
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}
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/**
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* Calculate history ops for an insert
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*
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* Inserts are moved forward by tracked deletes placed strictly before the
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* op. When an insert is made at the same position as a tracked delete, the
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* insert is placed before the tracked delete.
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*
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* We also add a commentIds property when inserts are made inside a comment.
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* The current behaviour is to include the insert in the comment only if the
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* insert is made strictly inside the comment. Inserts made at the edges are
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* not included in the comment.
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*
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* @param {InsertOp} op
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* @param {Comment[]} comments
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* @param {TrackedChange[]} changes
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* @returns {HistoryInsertOp}
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*/
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function getHistoryOpForInsert(op, comments, changes) {
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let hpos = op.p
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let trackedDeleteRejection = false
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const commentIds = new Set()
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for (const comment of comments) {
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if (comment.op.p < op.p && op.p < comment.op.p + comment.op.c.length) {
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// Insert is inside the comment; add the comment id
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commentIds.add(comment.op.t)
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}
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}
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for (const change of changes) {
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if (!isDelete(change.op)) {
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// We're only interested in tracked deletes
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continue
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}
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if (change.op.p < op.p) {
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// Tracked delete is before the op. Move the op forward.
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hpos += change.op.d.length
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} else if (change.op.p === op.p) {
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// Tracked delete is at the same position as the op. The insert comes before
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// the tracked delete so it doesn't move.
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if (op.u && change.op.d.startsWith(op.i)) {
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// We're undoing and the insert matches the start of the tracked
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// delete. RangesManager treats this as a tracked delete rejection. We
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// will note this in the op so that project-history can take the
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// appropriate action.
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trackedDeleteRejection = true
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}
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} else {
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// Tracked delete is after the insert. Tracked deletes are ordered, so
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// we know that all subsequent tracked deletes will be after the insert
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// and we can bail out.
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break
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}
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}
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/** @type {HistoryInsertOp} */
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const historyOp = { ...op }
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if (commentIds.size > 0) {
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historyOp.commentIds = Array.from(commentIds)
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}
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if (hpos !== op.p) {
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historyOp.hpos = hpos
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}
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if (trackedDeleteRejection) {
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historyOp.trackedDeleteRejection = true
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}
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return historyOp
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}
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/**
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* Calculate history op for a delete
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*
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* Deletes are moved forward by tracked deletes placed before or at the position of the
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* op. If a tracked delete is inside the delete, the delete is split in parts
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* so that characters are deleted around the tracked delete, but the tracked
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* delete itself is not deleted.
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*
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* @param {DeleteOp} op
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* @param {TrackedChange[]} changes
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* @returns {HistoryDeleteOp}
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*/
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function getHistoryOpForDelete(op, changes, opts = {}) {
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let hpos = op.p
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const opEnd = op.p + op.d.length
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/** @type HistoryDeleteTrackedChange[] */
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const changesInsideDelete = []
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for (const change of changes) {
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if (change.op.p <= op.p) {
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if (isDelete(change.op)) {
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// Tracked delete is before or at the position of the incoming delete.
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// Move the op forward.
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hpos += change.op.d.length
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} else if (isInsert(change.op)) {
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const changeEnd = change.op.p + change.op.i.length
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const endPos = Math.min(changeEnd, opEnd)
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if (endPos > op.p) {
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// Part of the tracked insert is inside the delete
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changesInsideDelete.push({
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type: 'insert',
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offset: 0,
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length: endPos - op.p,
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})
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}
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}
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} else if (change.op.p < op.p + op.d.length) {
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// Tracked change inside the deleted text. Record it for the history system.
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if (isDelete(change.op)) {
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changesInsideDelete.push({
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type: 'delete',
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offset: change.op.p - op.p,
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length: change.op.d.length,
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})
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} else if (isInsert(change.op)) {
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changesInsideDelete.push({
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type: 'insert',
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offset: change.op.p - op.p,
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length: Math.min(change.op.i.length, opEnd - change.op.p),
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})
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}
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} else {
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// We've seen all tracked changes before or inside the delete
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break
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}
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}
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/** @type {HistoryDeleteOp} */
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const historyOp = { ...op }
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if (hpos !== op.p) {
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historyOp.hpos = hpos
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}
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if (changesInsideDelete.length > 0) {
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historyOp.trackedChanges = changesInsideDelete
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}
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return historyOp
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}
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/**
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* Calculate history ops for a comment
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*
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* Comments are moved forward by tracked deletes placed before or at the
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* position of the op. If a tracked delete is inside the comment, the length of
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* the comment is extended to include the tracked delete.
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*
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* @param {CommentOp} op
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* @param {TrackedChange[]} changes
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* @returns {HistoryCommentOp}
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*/
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function getHistoryOpForComment(op, changes) {
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let hpos = op.p
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let hlen = op.c.length
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for (const change of changes) {
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if (!isDelete(change.op)) {
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// We're only interested in tracked deletes
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continue
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}
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if (change.op.p <= op.p) {
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// Tracked delete is before or at the position of the incoming comment.
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// Move the op forward.
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hpos += change.op.d.length
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} else if (change.op.p < op.p + op.c.length) {
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// Tracked comment inside the comment. Extend the length
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hlen += change.op.d.length
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} else {
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// We've seen all tracked deletes before or inside the comment
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break
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}
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}
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/** @type {HistoryCommentOp} */
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const historyOp = { ...op }
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if (hpos !== op.p) {
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historyOp.hpos = hpos
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}
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if (hlen !== op.c.length) {
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historyOp.hlen = hlen
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}
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return historyOp
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}
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module.exports = RangesManager
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