hedgedoc/old_src/lib/models/revision.ts
David Mehren 7b9f9a487b
Move old backend code to old_src folder
Signed-off-by: David Mehren <git@herrmehren.de>
2020-08-20 19:43:05 +02:00

347 lines
9.7 KiB
TypeScript

import { ChildProcess } from 'child_process'
import Sequelize from 'sequelize'
import { BelongsTo, Column, DataType, Default, ForeignKey, Model, PrimaryKey, Table } from 'sequelize-typescript'
// core
import { logger } from '../logger'
import { processData, stripNullByte } from '../utils/functions'
import { Note } from './note'
import async = require('async')
import childProcess = require('child_process')
import moment = require('moment')
import path = require('path')
import shortId = require('shortid')
const Op = Sequelize.Op
const dmpCallbackCache = {}
class Data {
msg
cacheKey
error
result
level
}
function createDmpWorker (): ChildProcess {
const worker = childProcess.fork(path.resolve(__dirname, '../workers/dmpWorker'), ['ignore'])
logger.debug('dmp worker process started')
worker.on('message', function (data: Data) {
if (!data || !data.msg || !data.cacheKey) {
logger.error('dmp worker error: not enough data on message')
return
}
const cacheKey = data.cacheKey
switch (data.msg) {
case 'log':
logger.log(data.level, data.result[0], ...data.result[1])
// The cacheKey is a dummy value and we want to skip the delete line.
return
case 'error':
dmpCallbackCache[cacheKey](data.error, null)
break
case 'check':
dmpCallbackCache[cacheKey](null, data.result)
break
}
delete dmpCallbackCache[cacheKey]
})
worker.on('close', function (code) {
logger.debug(`dmp worker process exited with code ${code}`)
})
return worker
}
let dmpWorker: ChildProcess = createDmpWorker()
function sendDmpWorker (data, callback): void {
if (!dmpWorker) {
dmpWorker = createDmpWorker()
}
const cacheKey = Date.now() + '_' + shortId.generate()
dmpCallbackCache[cacheKey] = callback
data = Object.assign(data, {
cacheKey: cacheKey
})
dmpWorker.send(data)
}
@Table
export class Revision extends Model<Revision> {
@Default(Sequelize.UUIDV4)
@PrimaryKey
@Column(DataType.UUID)
id: string
@Column(DataType.INTEGER)
length: number
@ForeignKey(() => Note)
@Column(DataType.UUID)
noteId: string
@BelongsTo(() => Note, { foreignKey: 'noteId', constraints: false, onDelete: 'CASCADE', hooks: true })
note: Note
@Column(DataType.TEXT({ length: 'long' }))
get patch (): string {
return this.getDataValue('patch') ?? ''
}
set patch (value: string) {
this.setDataValue('patch', stripNullByte(value))
}
@Column(DataType.TEXT({ length: 'long' }))
get lastContent (): string {
return this.getDataValue('lastContent') ?? ''
}
set lastContent (value: string) {
this.setDataValue('lastContent', stripNullByte(value))
}
@Column(DataType.TEXT({ length: 'long' }))
get content (): string {
return this.getDataValue('content') ?? ''
}
set content (value: string) {
this.setDataValue('content', stripNullByte(value))
}
@Column(DataType.TEXT({ length: 'long' }))
get authorship (): string {
return processData(this.getDataValue('authorship'), [], JSON.parse)
}
set authorship (value: string) {
this.setDataValue('authorship', value ? JSON.stringify(value) : value)
}
static getNoteRevisions (note: Note, callback): void {
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions: Revision[]) {
class RevisionDataActions { // TODO: Fix Type in actions.ts
time
length
}
const data: RevisionDataActions[] = []
revisions.forEach(function (revision: Revision) {
data.push({
time: moment(revision.createdAt).valueOf(),
length: revision.length
})
})
callback(null, data)
}).catch(function (err) {
callback(err, null)
})
}
static getPatchedNoteRevisionByTime (note: Note, time, errorCallback): void {
// find all revisions to prepare for all possible calculation
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions: Revision[]) {
if (revisions.length <= 0) {
errorCallback(null, null)
return
}
// measure target revision position
Revision.count({
where: {
noteId: note.id,
createdAt: {
[Op.gte]: time
}
}
}).then(function (count: number) {
if (count <= 0) {
errorCallback(null, null)
return
}
sendDmpWorker({
msg: 'get revision',
revisions: revisions,
count: count
}, errorCallback)
}).catch(function (err) {
errorCallback(err, null)
})
}).catch(function (err) {
errorCallback(err, null)
})
}
static checkAllNotesRevision (callback): void {
Revision.saveAllNotesRevision(function (err, notes: Note[]) {
if (err) {
callback(err, null)
return
}
if (!notes || notes.length <= 0) {
callback(null, notes)
} else {
Revision.checkAllNotesRevision(callback)
}
})
}
static saveAllNotesRevision (callback): void {
Note.findAll({
// query all notes that need to save for revision
where: {
[Op.and]: [
{
lastchangeAt: {
[Op.or]: {
[Op.eq]: null,
[Op.and]: {
[Op.ne]: null,
[Op.gt]: Sequelize.col('createdAt')
}
}
}
},
{
savedAt: {
[Op.or]: {
[Op.eq]: null,
[Op.lt]: Sequelize.col('lastchangeAt')
}
}
}
]
}
}).then(function (notes: Note[]) {
if (notes.length <= 0) {
callback(null, notes)
return
}
const savedNotes: Note[] = []
async.each(notes, function (note: Note, _callback) {
// revision saving policy: note not been modified for 5 mins or not save for 10 mins
if (note.lastchangeAt && note.savedAt) {
const lastchangeAt = moment(note.lastchangeAt)
const savedAt = moment(note.savedAt)
if (moment().isAfter(lastchangeAt.add(5, 'minutes'))) {
savedNotes.push(note)
Revision.saveNoteRevision(note, _callback)
} else if (lastchangeAt.isAfter(savedAt.add(10, 'minutes'))) {
savedNotes.push(note)
Revision.saveNoteRevision(note, _callback)
} else {
_callback(null, null)
}
} else {
savedNotes.push(note)
Revision.saveNoteRevision(note, _callback)
}
}, function (err) {
if (err) {
callback(err, null)
return
}
// return null when no notes need saving at this moment but have delayed tasks to be done
const result = ((savedNotes.length === 0) && (notes.length > 0)) ? null : savedNotes
callback(null, result)
})
}).catch(function (err) {
callback(err, null)
})
}
static saveNoteRevision (note: Note, callback): void {
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions: Revision[]) {
if (revisions.length <= 0) {
// if no revision available
let noteContent = note.content
if (noteContent.length === 0) {
noteContent = ''
}
Revision.create({
noteId: note.id,
lastContent: noteContent,
length: noteContent.length,
authorship: note.authorship
}).then(function (revision: Revision) {
Revision.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
callback(err, null)
})
} else {
const latestRevision = revisions[0]
const lastContent = latestRevision.content || latestRevision.lastContent
const content = note.content
sendDmpWorker({
msg: 'create patch',
lastDoc: lastContent,
currDoc: content
}, function (err, patch) {
if (err) {
logger.error('save note revision error', err)
return
}
if (!patch) {
// if patch is empty (means no difference) then just update the latest revision updated time
latestRevision.changed('updatedAt', true)
latestRevision.update({
updatedAt: Date.now()
}).then(function (revision: Revision) {
Revision.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
callback(err, null)
})
} else {
Revision.create({
noteId: note.id,
patch: patch,
content: note.content,
length: note.content.length,
authorship: note.authorship
}).then(function (revision: Revision) {
// clear last revision content to reduce db size
latestRevision.update({
content: null
}).then(function () {
Revision.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
callback(err, null)
})
}).catch(function (err) {
callback(err, null)
})
}
})
}
}).catch(function (err) {
callback(err, null)
})
}
static finishSaveNoteRevision (note: Note, revision: Revision, callback): void {
note.update({
savedAt: revision.updatedAt
}).then(function () {
callback(null, revision)
}).catch(function (err) {
callback(err, null)
})
}
}