412 lines
11 KiB
TypeScript
412 lines
11 KiB
TypeScript
import WS from 'ws'
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import dayjs, { Dayjs } from 'dayjs'
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import { v4 as uuid } from 'uuid'
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import { EventEmitter } from 'events'
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import { WebSocketInterface } from '../megalodon'
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import proxyAgent, { ProxyConfig } from '../proxy_config'
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import MisskeyAPI from './api_client'
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/**
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* WebSocket
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* Misskey is not support http streaming. It supports websocket instead of streaming.
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* So this class connect to Misskey server with WebSocket.
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*/
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export default class WebSocket extends EventEmitter implements WebSocketInterface {
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public url: string
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public channel: 'user' | 'localTimeline' | 'hybridTimeline' | 'globalTimeline' | 'conversation' | 'list'
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public parser: any
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public headers: { [key: string]: string }
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public proxyConfig: ProxyConfig | false = false
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public listId: string | null = null
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private _accessToken: string
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private _reconnectInterval: number
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private _reconnectMaxAttempts: number
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private _reconnectCurrentAttempts: number
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private _connectionClosed: boolean
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private _client: WS | null = null
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private _channelID: string
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private _pongReceivedTimestamp: Dayjs
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private _heartbeatInterval: number = 60000
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private _pongWaiting: boolean = false
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/**
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* @param url Full url of websocket: e.g. wss://misskey.io/streaming
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* @param channel Channel name is user, localTimeline, hybridTimeline, globalTimeline, conversation or list.
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* @param accessToken The access token.
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* @param listId This parameter is required when you specify list as channel.
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*/
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constructor(
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url: string,
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channel: 'user' | 'localTimeline' | 'hybridTimeline' | 'globalTimeline' | 'conversation' | 'list',
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accessToken: string,
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listId: string | undefined,
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userAgent: string,
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proxyConfig: ProxyConfig | false = false
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) {
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super()
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this.url = url
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this.parser = new Parser()
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this.channel = channel
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this.headers = {
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'User-Agent': userAgent
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}
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if (listId === undefined) {
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this.listId = null
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} else {
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this.listId = listId
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}
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this.proxyConfig = proxyConfig
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this._accessToken = accessToken
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this._reconnectInterval = 10000
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this._reconnectMaxAttempts = Infinity
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this._reconnectCurrentAttempts = 0
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this._connectionClosed = false
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this._channelID = uuid()
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this._pongReceivedTimestamp = dayjs()
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}
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/**
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* Start websocket connection.
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*/
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public start() {
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this._connectionClosed = false
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this._resetRetryParams()
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this._startWebSocketConnection()
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}
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private baseUrlToHost(baseUrl: string): string {
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return baseUrl.replace('https://', '')
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}
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/**
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* Reset connection and start new websocket connection.
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*/
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private _startWebSocketConnection() {
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this._resetConnection()
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this._setupParser()
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this._client = this._connect()
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this._bindSocket(this._client)
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}
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/**
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* Stop current connection.
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*/
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public stop() {
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this._connectionClosed = true
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this._resetConnection()
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this._resetRetryParams()
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}
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/**
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* Clean up current connection, and listeners.
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*/
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private _resetConnection() {
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if (this._client) {
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this._client.close(1000)
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this._client.removeAllListeners()
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this._client = null
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}
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if (this.parser) {
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this.parser.removeAllListeners()
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}
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}
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/**
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* Resets the parameters used in reconnect.
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*/
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private _resetRetryParams() {
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this._reconnectCurrentAttempts = 0
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}
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/**
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* Connect to the endpoint.
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*/
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private _connect(): WS {
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let options: WS.ClientOptions = {
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headers: this.headers
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}
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if (this.proxyConfig) {
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options = Object.assign(options, {
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agent: proxyAgent(this.proxyConfig)
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})
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}
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const cli: WS = new WS(`${this.url}?i=${this._accessToken}`, options)
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return cli
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}
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/**
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* Connect specified channels in websocket.
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*/
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private _channel() {
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if (!this._client) {
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return
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}
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switch (this.channel) {
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case 'conversation':
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this._client.send(
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JSON.stringify({
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type: 'connect',
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body: {
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channel: 'main',
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id: this._channelID
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}
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})
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)
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break
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case 'user':
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this._client.send(
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JSON.stringify({
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type: 'connect',
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body: {
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channel: 'main',
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id: this._channelID
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}
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})
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)
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this._client.send(
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JSON.stringify({
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type: 'connect',
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body: {
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channel: 'homeTimeline',
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id: this._channelID
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}
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})
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)
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break
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case 'list':
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this._client.send(
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JSON.stringify({
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type: 'connect',
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body: {
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channel: 'userList',
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id: this._channelID,
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params: {
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listId: this.listId
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}
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}
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})
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)
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break
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default:
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this._client.send(
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JSON.stringify({
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type: 'connect',
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body: {
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channel: this.channel,
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id: this._channelID
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}
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})
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)
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break
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}
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}
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/**
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* Reconnects to the same endpoint.
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*/
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private _reconnect() {
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setTimeout(() => {
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// Skip reconnect when client is connecting.
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// https://github.com/websockets/ws/blob/7.2.1/lib/websocket.js#L365
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if (this._client && this._client.readyState === WS.CONNECTING) {
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return
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}
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if (this._reconnectCurrentAttempts < this._reconnectMaxAttempts) {
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this._reconnectCurrentAttempts++
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this._clearBinding()
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if (this._client) {
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// In reconnect, we want to close the connection immediately,
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// because recoonect is necessary when some problems occur.
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this._client.terminate()
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}
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// Call connect methods
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console.log('Reconnecting')
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this._client = this._connect()
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this._bindSocket(this._client)
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}
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}, this._reconnectInterval)
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}
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/**
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* Clear binding event for websocket client.
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*/
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private _clearBinding() {
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if (this._client) {
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this._client.removeAllListeners('close')
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this._client.removeAllListeners('pong')
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this._client.removeAllListeners('open')
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this._client.removeAllListeners('message')
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this._client.removeAllListeners('error')
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}
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}
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/**
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* Bind event for web socket client.
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* @param client A WebSocket instance.
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*/
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private _bindSocket(client: WS) {
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client.on('close', (code: number, _reason: Buffer) => {
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if (code === 1000) {
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this.emit('close', {})
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} else {
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console.log(`Closed connection with ${code}`)
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if (!this._connectionClosed) {
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this._reconnect()
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}
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}
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})
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client.on('pong', () => {
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this._pongWaiting = false
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this.emit('pong', {})
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this._pongReceivedTimestamp = dayjs()
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// It is required to anonymous function since get this scope in checkAlive.
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setTimeout(() => this._checkAlive(this._pongReceivedTimestamp), this._heartbeatInterval)
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})
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client.on('open', () => {
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this.emit('connect', {})
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this._channel()
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// Call first ping event.
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setTimeout(() => {
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client.ping('')
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}, 10000)
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})
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client.on('message', (data: WS.Data, isBinary: boolean) => {
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this.parser.parse(data, isBinary, this._channelID)
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})
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client.on('error', (err: Error) => {
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this.emit('error', err)
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})
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}
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/**
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* Set up parser when receive message.
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*/
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private _setupParser() {
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this.parser.on('update', (note: MisskeyAPI.Entity.Note) => {
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this.emit('update', MisskeyAPI.Converter.note(note, this.baseUrlToHost(this.url)))
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})
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this.parser.on('notification', (notification: MisskeyAPI.Entity.Notification) => {
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this.emit('notification', MisskeyAPI.Converter.notification(notification, this.baseUrlToHost(this.url)))
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})
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this.parser.on('conversation', (note: MisskeyAPI.Entity.Note) => {
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this.emit('conversation', MisskeyAPI.Converter.noteToConversation(note, this.baseUrlToHost(this.url)))
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})
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this.parser.on('error', (err: Error) => {
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this.emit('parser-error', err)
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})
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}
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/**
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* Call ping and wait to pong.
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*/
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private _checkAlive(timestamp: Dayjs) {
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const now: Dayjs = dayjs()
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// Block multiple calling, if multiple pong event occur.
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// It the duration is less than interval, through ping.
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if (now.diff(timestamp) > this._heartbeatInterval - 1000 && !this._connectionClosed) {
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// Skip ping when client is connecting.
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// https://github.com/websockets/ws/blob/7.2.1/lib/websocket.js#L289
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if (this._client && this._client.readyState !== WS.CONNECTING) {
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this._pongWaiting = true
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this._client.ping('')
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setTimeout(() => {
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if (this._pongWaiting) {
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this._pongWaiting = false
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this._reconnect()
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}
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}, 10000)
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}
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}
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}
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}
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/**
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* Parser
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* This class provides parser for websocket message.
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*/
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export class Parser extends EventEmitter {
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/**
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* @param message Message body of websocket.
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* @param channelID Parse only messages which has same channelID.
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*/
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public parse(data: WS.Data, isBinary: boolean, channelID: string) {
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const message = isBinary ? data : data.toString()
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if (typeof message !== 'string') {
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this.emit('heartbeat', {})
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return
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}
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if (message === '') {
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this.emit('heartbeat', {})
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return
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}
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let obj: {
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type: string
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body: {
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id: string
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type: string
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body: any
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}
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}
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let body: {
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id: string
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type: string
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body: any
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}
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try {
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obj = JSON.parse(message)
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if (obj.type !== 'channel') {
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return
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}
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if (!obj.body) {
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return
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}
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body = obj.body
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if (body.id !== channelID) {
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return
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}
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} catch (err) {
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this.emit('error', new Error(`Error parsing websocket reply: ${message}, error message: ${err}`))
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return
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}
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switch (body.type) {
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case 'note':
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this.emit('update', body.body as MisskeyAPI.Entity.Note)
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break
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case 'notification':
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this.emit('notification', body.body as MisskeyAPI.Entity.Notification)
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break
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case 'mention': {
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const note = body.body as MisskeyAPI.Entity.Note
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if (note.visibility === 'specified') {
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this.emit('conversation', note)
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}
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break
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}
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// When renote and followed event, the same notification will be received.
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case 'renote':
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case 'followed':
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case 'follow':
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case 'unfollow':
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case 'receiveFollowRequest':
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case 'meUpdated':
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case 'readAllNotifications':
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case 'readAllUnreadSpecifiedNotes':
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case 'readAllAntennas':
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case 'readAllUnreadMentions':
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case 'unreadNotification':
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// Ignore these events
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break
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default:
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this.emit('error', new Error(`Unknown event has received: ${JSON.stringify(body)}`))
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break
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}
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}
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}
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