73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
import fs from 'fs'
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import path from 'path'
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import * as encoding from '../../lib/encoding.js'
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import * as decoding from '../../lib/decoding.js'
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import { createMutualExclude } from '../../lib/mutualExclude.js'
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import { encodeUpdate, encodeStructsDS, decodePersisted } from './decodePersisted.js'
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function createFilePath (persistence, roomName) {
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// TODO: filename checking!
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return path.join(persistence.dir, roomName)
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}
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export default class FilePersistence {
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constructor (dir) {
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this.dir = dir
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this._mutex = createMutualExclude()
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}
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setRemoteUpdateCounter (roomName, remoteUpdateCounter) {
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// TODO: implement
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// nop
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}
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saveUpdate (room, y, encodedStructs) {
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return new Promise((resolve, reject) => {
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this._mutex(() => {
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const filePath = createFilePath(this, room)
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const updateMessage = encoding.createEncoder()
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encodeUpdate(y, encodedStructs, updateMessage)
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fs.appendFile(filePath, Buffer.from(encoding.toBuffer(updateMessage)), (err) => {
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if (err !== null) {
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reject(err)
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} else {
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resolve()
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}
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})
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}, resolve)
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})
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}
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saveState (roomName, y) {
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return new Promise((resolve, reject) => {
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const encoder = encoding.createEncoder()
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encodeStructsDS(y, encoder)
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const filePath = createFilePath(this, roomName)
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fs.writeFile(filePath, Buffer.from(encoding.toBuffer(encoder)), (err) => {
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if (err !== null) {
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reject(err)
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} else {
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resolve()
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}
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})
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})
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}
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readState (roomName, y) {
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// Check if the file exists in the current directory.
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return new Promise((resolve, reject) => {
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const filePath = path.join(this.dir, roomName)
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fs.readFile(filePath, (err, data) => {
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if (err !== null) {
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resolve()
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// reject(err)
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} else {
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this._mutex(() => {
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console.info(`unpacking data (${data.length})`)
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console.time('unpacking')
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decodePersisted(y, decoding.createDecoder(data.buffer))
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console.timeEnd('unpacking')
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})
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resolve()
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}
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})
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})
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}
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}
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