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web_socket.ts
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web_socket.ts
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import WS from 'ws'
import dayjs, { Dayjs } from 'dayjs'
import { EventEmitter } from 'events'
import proxyAgent, { ProxyConfig } from '../proxy_config'
import { WebSocketInterface } from '../megalodon'
import MastodonAPI from './api_client'
/**
* WebSocket
* Pleroma is not support streaming. It is support websocket instead of streaming.
* So this class connect to Phoenix websocket for Pleroma.
*/
export default class WebSocket extends EventEmitter implements WebSocketInterface {
public url: string
public stream: string
public params: string | null
public parser: Parser
public headers: { [key: string]: string }
public proxyConfig: ProxyConfig | false = false
private _accessToken: string
private _reconnectInterval: number
private _reconnectMaxAttempts: number
private _reconnectCurrentAttempts: number
private _connectionClosed: boolean
private _client: WS | null
private _pongReceivedTimestamp: Dayjs
private _heartbeatInterval: number = 60000
private _pongWaiting: boolean = false
/**
* @param url Full url of websocket: e.g. https://pleroma.io/api/v1/streaming
* @param stream Stream name, please refer: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/mastodon_api/mastodon_socket.ex#L19-28
* @param accessToken The access token.
* @param userAgent The specified User Agent.
* @param proxyConfig Proxy setting, or set false if don't use proxy.
*/
constructor(
url: string,
stream: string,
params: string | undefined,
accessToken: string,
userAgent: string,
proxyConfig: ProxyConfig | false = false
) {
super()
this.url = url
this.stream = stream
if (params === undefined) {
this.params = null
} else {
this.params = params
}
this.parser = new Parser()
this.headers = {
'User-Agent': userAgent,
// To avoid: https://github.com/axios/axios/issues/5346
'Accept-Encoding': 'gzip,deflate,compress'
}
this.proxyConfig = proxyConfig
this._accessToken = accessToken
this._reconnectInterval = 10000
this._reconnectMaxAttempts = Infinity
this._reconnectCurrentAttempts = 0
this._connectionClosed = false
this._client = null
this._pongReceivedTimestamp = dayjs()
}
/**
* Start websocket connection.
*/
public start() {
this._connectionClosed = false
this._resetRetryParams()
this._startWebSocketConnection()
}
/**
* Reset connection and start new websocket connection.
*/
private _startWebSocketConnection() {
this._resetConnection()
this._setupParser()
this._client = this._connect(this.url, this.stream, this.params, this._accessToken, this.headers, this.proxyConfig)
this._bindSocket(this._client)
}
/**
* Stop current connection.
*/
public stop() {
this._connectionClosed = true
this._resetConnection()
this._resetRetryParams()
}
/**
* Clean up current connection, and listeners.
*/
private _resetConnection() {
if (this._client) {
this._client.close(1000)
this._client.removeAllListeners()
this._client = null
}
if (this.parser) {
this.parser.removeAllListeners()
}
}
/**
* Resets the parameters used in reconnect.
*/
private _resetRetryParams() {
this._reconnectCurrentAttempts = 0
}
/**
* Reconnects to the same endpoint.
*/
private _reconnect() {
setTimeout(() => {
// Skip reconnect when client is connecting.
// https://github.com/websockets/ws/blob/7.2.1/lib/websocket.js#L365
if (this._client && this._client.readyState === WS.CONNECTING) {
return
}
if (this._reconnectCurrentAttempts < this._reconnectMaxAttempts) {
this._reconnectCurrentAttempts++
this._clearBinding()
if (this._client) {
// In reconnect, we want to close the connection immediately,
// because recoonect is necessary when some problems occur.
this._client.terminate()
}
// Call connect methods
console.log('Reconnecting')
this._client = this._connect(this.url, this.stream, this.params, this._accessToken, this.headers, this.proxyConfig)
this._bindSocket(this._client)
}
}, this._reconnectInterval)
}
/**
* @param url Base url of streaming endpoint.
* @param stream The specified stream name.
* @param accessToken Access token.
* @param headers The specified headers.
* @param proxyConfig Proxy setting, or set false if don't use proxy.
* @return A WebSocket instance.
*/
private _connect(
url: string,
stream: string,
params: string | null,
accessToken: string,
headers: { [key: string]: string },
proxyConfig: ProxyConfig | false
): WS {
const parameter: Array<string> = [`stream=${stream}`]
if (params) {
parameter.push(params)
}
if (accessToken !== null) {
parameter.push(`access_token=${accessToken}`)
}
const requestURL: string = `${url}/?${parameter.join('&')}`
let options: WS.ClientOptions = {
headers: headers
}
if (proxyConfig) {
options = Object.assign(options, {
agent: proxyAgent(proxyConfig)
})
}
const cli: WS = new WS(requestURL, options)
return cli
}
/**
* Clear binding event for web socket client.
*/
private _clearBinding() {
if (this._client) {
this._client.removeAllListeners('close')
this._client.removeAllListeners('pong')
this._client.removeAllListeners('open')
this._client.removeAllListeners('message')
this._client.removeAllListeners('error')
}
}
/**
* Bind event for web socket client.
* @param client A WebSocket instance.
*/
private _bindSocket(client: WS) {
client.on('close', (code: number, _reason: Buffer) => {
// Refer the code: https://tools.ietf.org/html/rfc6455#section-7.4
if (code === 1000) {
this.emit('close', {})
} else {
console.log(`Closed connection with ${code}`)
// If already called close method, it does not retry.
if (!this._connectionClosed) {
this._reconnect()
}
}
})
client.on('pong', () => {
this._pongWaiting = false
this.emit('pong', {})
this._pongReceivedTimestamp = dayjs()
// It is required to anonymous function since get this scope in checkAlive.
setTimeout(() => this._checkAlive(this._pongReceivedTimestamp), this._heartbeatInterval)
})
client.on('open', () => {
this.emit('connect', {})
// Call first ping event.
setTimeout(() => {
client.ping('')
}, 10000)
})
client.on('message', (data: WS.Data, isBinary: boolean) => {
this.parser.parse(data, isBinary)
})
client.on('error', (err: Error) => {
this.emit('error', err)
})
}
/**
* Set up parser when receive message.
*/
private _setupParser() {
this.parser.on('update', (status: MastodonAPI.Entity.Status) => {
this.emit('update', MastodonAPI.Converter.status(status))
})
this.parser.on('notification', (notification: MastodonAPI.Entity.Notification) => {
this.emit('notification', MastodonAPI.Converter.notification(notification))
})
this.parser.on('delete', (id: string) => {
this.emit('delete', id)
})
this.parser.on('conversation', (conversation: MastodonAPI.Entity.Conversation) => {
this.emit('conversation', MastodonAPI.Converter.conversation(conversation))
})
this.parser.on('error', (err: Error) => {
this.emit('parser-error', err)
})
this.parser.on('heartbeat', _ => {
this.emit('heartbeat', 'heartbeat')
})
}
/**
* Call ping and wait to pong.
*/
private _checkAlive(timestamp: Dayjs) {
const now: Dayjs = dayjs()
// Block multiple calling, if multiple pong event occur.
// It the duration is less than interval, through ping.
if (now.diff(timestamp) > this._heartbeatInterval - 1000 && !this._connectionClosed) {
// Skip ping when client is connecting.
// https://github.com/websockets/ws/blob/7.2.1/lib/websocket.js#L289
if (this._client && this._client.readyState !== WS.CONNECTING) {
this._pongWaiting = true
this._client.ping('')
setTimeout(() => {
if (this._pongWaiting) {
this._pongWaiting = false
this._reconnect()
}
}, 10000)
}
}
}
}
/**
* Parser
* This class provides parser for websocket message.
*/
export class Parser extends EventEmitter {
/**
* @param message Message body of websocket.
*/
public parse(data: WS.Data, isBinary: boolean) {
const message = isBinary ? data : data.toString()
if (typeof message !== 'string') {
this.emit('heartbeat', {})
return
}
if (message === '') {
this.emit('heartbeat', {})
return
}
let event = ''
let payload = ''
let mes = {}
try {
const obj = JSON.parse(message)
event = obj.event
payload = obj.payload
mes = JSON.parse(payload)
} catch (err) {
// delete event does not have json object
if (event !== 'delete') {
this.emit('error', new Error(`Error parsing websocket reply: ${message}, error message: ${err}`))
return
}
}
switch (event) {
case 'update':
this.emit('update', mes as MastodonAPI.Entity.Status)
break
case 'notification':
this.emit('notification', mes as MastodonAPI.Entity.Notification)
break
case 'conversation':
this.emit('conversation', mes as MastodonAPI.Entity.Conversation)
break
case 'delete':
this.emit('delete', payload)
break
default:
this.emit('error', new Error(`Unknown event has received: ${message}`))
}
}
}