hedgedoc/lib/models/revision.ts
David Mehren 0ad30a0029
revision.ts: Formatting, use Utils instead of global Sequelize object
Signed-off-by: David Mehren <dmehren1@gmail.com>
2020-04-25 16:04:02 +02:00

310 lines
9 KiB
TypeScript

import {BelongsTo, Column, DataType, ForeignKey, IsUUID, Model, PrimaryKey, Table} from 'sequelize-typescript'
import {ChildProcess} from "child_process";
import {Note} from './note'
import {Utils} from "../utils";
import Sequelize from "sequelize";
import async = require('async');
import moment = require('moment');
import childProcess = require('child_process');
import shortId = require('shortid');
import path = require('path');
// core
import logger = require('../logger');
const Op = Sequelize.Op;
var dmpWorker: ChildProcess | null = createDmpWorker()
var dmpCallbackCache = {}
function createDmpWorker() {
var worker = childProcess.fork(path.resolve(__dirname, '../workers/dmpWorker.js'), ['ignore'])
logger.debug('dmp worker process started')
worker.on('message', function (data: any) {
if (!data || !data.msg || !data.cacheKey) {
return logger.error('dmp worker error: not enough data on message')
}
var cacheKey = data.cacheKey
switch (data.msg) {
case 'error':
dmpCallbackCache[cacheKey](data.error, null)
break
case 'check':
dmpCallbackCache[cacheKey](null, data.result)
break
}
delete dmpCallbackCache[cacheKey]
})
worker.on('close', function (code) {
dmpWorker = null;
logger.debug(`dmp worker process exited with code ${code}`)
})
return worker
}
function sendDmpWorker(data, callback) {
if (!dmpWorker) dmpWorker = createDmpWorker()
var cacheKey = Date.now() + '_' + shortId.generate()
dmpCallbackCache[cacheKey] = callback
data = Object.assign(data, {
cacheKey: cacheKey
})
dmpWorker.send(data)
}
@Table
export class Revision extends Model<Revision> {
@IsUUID(4)
@PrimaryKey
@Column
id: string;
@Column(DataType.TEXT({length: 'long'}))
get patch(): string {
return Utils.processData(this.getDataValue('patch'), '')
}
set patch(value: string) {
this.setDataValue('patch', Utils.stripNullByte(value))
}
@Column(DataType.TEXT({length: 'long'}))
get lastContent(): string {
return Utils.processData(this.getDataValue('lastContent'), '')
}
set lastContent(value: string) {
this.setDataValue('lastContent', Utils.stripNullByte(value))
}
@Column(DataType.TEXT({length: 'long'}))
get content(): string {
return Utils.processData(this.getDataValue('content'), '')
}
set content(value: string) {
this.setDataValue('content', Utils.stripNullByte(value))
}
@Column(DataType.INTEGER)
length: number
@Column(DataType.TEXT({length: 'long'}))
get authorship(): string {
return Utils.processData(this.getDataValue('authorship'), [], JSON.parse)
}
set authorship(value: string) {
this.setDataValue('authorship', value ? JSON.stringify(value) : value)
}
@ForeignKey(() => Note)
@Column(DataType.UUID)
noteId: string
@BelongsTo(() => Note, {foreignKey: 'noteId', constraints: false, onDelete: 'CASCADE', hooks: true})
note: Note;
getNoteRevisions(note, callback) {
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions) {
var data: any[] = []
for (var i = 0; i < revisions.length; i++) {
var revision = revisions[i]
data.push({
time: moment(revision.createdAt).valueOf(),
length: revision.length
})
}
callback(null, data)
}).catch(function (err) {
callback(err, null)
})
}
getPatchedNoteRevisionByTime(note, time, callback) {
// find all revisions to prepare for all possible calculation
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions) {
if (revisions.length <= 0) return callback(null, null)
// measure target revision position
Revision.count({
where: {
noteId: note.id,
createdAt: {
[Op.gte]: time
}
},
}).then(function (count) {
if (count <= 0) return callback(null, null)
sendDmpWorker({
msg: 'get revision',
revisions: revisions,
count: count
}, callback)
}).catch(function (err) {
return callback(err, null)
})
}).catch(function (err) {
return callback(err, null)
})
}
static checkAllNotesRevision(callback) {
Revision.saveAllNotesRevision(function (err, notes) {
if (err) return callback(err, null)
if (!notes || notes.length <= 0) {
return callback(null, notes)
} else {
Revision.checkAllNotesRevision(callback)
}
})
}
static saveAllNotesRevision(callback) {
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) {
if (notes.length <= 0) return callback(null, notes)
var savedNotes: any[] = []
async.each(notes, function (note: any, _callback) {
// revision saving policy: note not been modified for 5 mins or not save for 10 mins
if (note.lastchangeAt && note.savedAt) {
var lastchangeAt = moment(note.lastchangeAt)
var 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 {
return _callback(null, null)
}
} else {
savedNotes.push(note)
Revision.saveNoteRevision(note, _callback)
}
}, function (err) {
if (err) {
return callback(err, null)
}
// return null when no notes need saving at this moment but have delayed tasks to be done
var result = ((savedNotes.length === 0) && (notes.length > savedNotes.length)) ? null : savedNotes
return callback(null, result)
})
}).catch(function (err) {
return callback(err, null)
})
}
static saveNoteRevision(note, callback) {
Revision.findAll({
where: {
noteId: note.id
},
order: [['createdAt', 'DESC']]
}).then(function (revisions) {
if (revisions.length <= 0) {
// if no revision available
Revision.create({
noteId: note.id,
lastContent: note.content ? note.content : '',
length: note.content ? note.content.length : 0,
authorship: note.authorship
}).then(function (revision) {
Revision.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
return callback(err, null)
})
} else {
var latestRevision = revisions[0]
var lastContent = latestRevision.content || latestRevision.lastContent
var content = note.content
sendDmpWorker({
msg: 'create patch',
lastDoc: lastContent,
currDoc: content
}, function (err, patch) {
if (err) logger.error('save note revision error', err)
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.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
return callback(err, null)
})
} else {
Revision.create({
noteId: note.id,
patch: patch,
content: note.content,
length: note.content.length,
authorship: note.authorship
}).then(function (revision) {
// clear last revision content to reduce db size
latestRevision.update({
content: null
}).then(function () {
Revision.finishSaveNoteRevision(note, revision, callback)
}).catch(function (err) {
return callback(err, null)
})
}).catch(function (err) {
return callback(err, null)
})
}
})
}
}).catch(function (err) {
return callback(err, null)
})
}
static finishSaveNoteRevision(note, revision, callback) {
note.update({
savedAt: revision.updatedAt
}).then(function () {
return callback(null, revision)
}).catch(function (err) {
return callback(err, null)
})
}
}