Improve streaming server with cluster (#1970)
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geta6
Eugen
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7a5086729a
commit
64e1d51025
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@ -81,3 +81,7 @@ SMTP_FROM_ADDRESS=notifications@example.com
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# Advanced settings
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# If you need to use pgBouncer, you need to disable prepared statements:
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# PREPARED_STATEMENTS=false
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# Cluster number setting for streaming API server.
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# If you comment out following line, cluster number will be `numOfCpuCores - 1`.
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STREAMING_CLUSTER_NUM=1
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@ -1,3 +1,5 @@
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import os from 'os';
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import cluster from 'cluster';
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import dotenv from 'dotenv'
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import express from 'express'
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import http from 'http'
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@ -14,7 +16,24 @@ dotenv.config({
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path: env === 'production' ? '.env.production' : '.env'
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})
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const pgConfigs = {
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if (cluster.isMaster) {
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// cluster master
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const core = +process.env.STREAMING_CLUSTER_NUM || (env === 'development' ? 1 : os.cpus().length - 1)
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const fork = () => {
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const worker = cluster.fork();
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worker.on('exit', (code, signal) => {
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log.error(`Worker died with exit code ${code}, signal ${signal} received.`);
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setTimeout(() => fork(), 0);
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});
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};
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for (let i = 0; i < core; i++) fork();
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log.info(`Starting streaming API server master with ${core} workers`)
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} else {
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// cluster worker
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const pgConfigs = {
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development: {
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database: 'mastodon_development',
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host: '/var/run/postgresql',
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@ -29,22 +48,22 @@ const pgConfigs = {
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port: process.env.DB_PORT || 5432,
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max: 10
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}
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}
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}
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const app = express()
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const pgPool = new pg.Pool(pgConfigs[env])
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const server = http.createServer(app)
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const wss = new WebSocket.Server({ server })
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const app = express()
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const pgPool = new pg.Pool(pgConfigs[env])
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const server = http.createServer(app)
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const wss = new WebSocket.Server({ server })
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const redisClient = redis.createClient({
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const redisClient = redis.createClient({
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host: process.env.REDIS_HOST || '127.0.0.1',
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port: process.env.REDIS_PORT || 6379,
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password: process.env.REDIS_PASSWORD
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})
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})
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const subs = {}
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const subs = {}
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redisClient.on('pmessage', (_, channel, message) => {
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redisClient.on('pmessage', (_, channel, message) => {
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const callbacks = subs[channel]
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log.silly(`New message on channel ${channel}`)
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@ -54,37 +73,37 @@ redisClient.on('pmessage', (_, channel, message) => {
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}
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callbacks.forEach(callback => callback(message))
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})
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})
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redisClient.psubscribe('timeline:*')
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redisClient.psubscribe('timeline:*')
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const subscribe = (channel, callback) => {
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const subscribe = (channel, callback) => {
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log.silly(`Adding listener for ${channel}`)
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subs[channel] = subs[channel] || []
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subs[channel].push(callback)
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}
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}
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const unsubscribe = (channel, callback) => {
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const unsubscribe = (channel, callback) => {
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log.silly(`Removing listener for ${channel}`)
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subs[channel] = subs[channel].filter(item => item !== callback)
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}
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}
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const allowCrossDomain = (req, res, next) => {
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const allowCrossDomain = (req, res, next) => {
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res.header('Access-Control-Allow-Origin', '*')
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res.header('Access-Control-Allow-Headers', 'Authorization, Accept, Cache-Control')
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res.header('Access-Control-Allow-Methods', 'GET, OPTIONS')
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next()
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}
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}
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const setRequestId = (req, res, next) => {
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const setRequestId = (req, res, next) => {
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req.requestId = uuid.v4()
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res.header('X-Request-Id', req.requestId)
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next()
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}
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}
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const accountFromToken = (token, req, next) => {
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const accountFromToken = (token, req, next) => {
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pgPool.connect((err, client, done) => {
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if (err) {
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next(err)
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@ -112,9 +131,9 @@ const accountFromToken = (token, req, next) => {
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next()
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})
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})
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}
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}
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const authenticationMiddleware = (req, res, next) => {
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const authenticationMiddleware = (req, res, next) => {
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if (req.method === 'OPTIONS') {
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next()
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return
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@ -133,17 +152,17 @@ const authenticationMiddleware = (req, res, next) => {
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const token = authorization.replace(/^Bearer /, '')
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accountFromToken(token, req, next)
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}
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}
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const errorMiddleware = (err, req, res, next) => {
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const errorMiddleware = (err, req, res, next) => {
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log.error(req.requestId, err)
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res.writeHead(err.statusCode || 500, { 'Content-Type': 'application/json' })
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res.end(JSON.stringify({ error: err.statusCode ? `${err}` : 'An unexpected error occurred' }))
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}
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}
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const placeholders = (arr, shift = 0) => arr.map((_, i) => `$${i + 1 + shift}`).join(', ');
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const placeholders = (arr, shift = 0) => arr.map((_, i) => `$${i + 1 + shift}`).join(', ');
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const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false) => {
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const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false) => {
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log.verbose(req.requestId, `Starting stream from ${id} for ${req.accountId}`)
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const listener = message => {
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@ -191,10 +210,10 @@ const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false)
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subscribe(id, listener)
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attachCloseHandler(id, listener)
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}
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}
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// Setup stream output to HTTP
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const streamToHttp = (req, res) => {
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// Setup stream output to HTTP
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const streamToHttp = (req, res) => {
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res.setHeader('Content-Type', 'text/event-stream')
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res.setHeader('Transfer-Encoding', 'chunked')
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@ -209,17 +228,17 @@ const streamToHttp = (req, res) => {
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res.write(`event: ${event}\n`)
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res.write(`data: ${payload}\n\n`)
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}
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}
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}
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// Setup stream end for HTTP
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const streamHttpEnd = req => (id, listener) => {
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// Setup stream end for HTTP
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const streamHttpEnd = req => (id, listener) => {
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req.on('close', () => {
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unsubscribe(id, listener)
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})
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}
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}
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// Setup stream output to WebSockets
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const streamToWs = (req, ws) => {
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// Setup stream output to WebSockets
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const streamToWs = (req, ws) => {
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const heartbeat = setInterval(() => ws.ping(), 15000)
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ws.on('close', () => {
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@ -235,10 +254,10 @@ const streamToWs = (req, ws) => {
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ws.send(JSON.stringify({ event, payload }))
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}
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}
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}
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// Setup stream end for WebSockets
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const streamWsEnd = ws => (id, listener) => {
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// Setup stream end for WebSockets
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const streamWsEnd = ws => (id, listener) => {
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ws.on('close', () => {
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unsubscribe(id, listener)
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})
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@ -246,34 +265,34 @@ const streamWsEnd = ws => (id, listener) => {
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ws.on('error', e => {
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unsubscribe(id, listener)
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})
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}
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}
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app.use(setRequestId)
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app.use(allowCrossDomain)
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app.use(authenticationMiddleware)
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app.use(errorMiddleware)
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app.use(setRequestId)
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app.use(allowCrossDomain)
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app.use(authenticationMiddleware)
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app.use(errorMiddleware)
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app.get('/api/v1/streaming/user', (req, res) => {
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app.get('/api/v1/streaming/user', (req, res) => {
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streamFrom(`timeline:${req.accountId}`, req, streamToHttp(req, res), streamHttpEnd(req))
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})
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})
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app.get('/api/v1/streaming/public', (req, res) => {
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app.get('/api/v1/streaming/public', (req, res) => {
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streamFrom('timeline:public', req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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})
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app.get('/api/v1/streaming/public/local', (req, res) => {
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app.get('/api/v1/streaming/public/local', (req, res) => {
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streamFrom('timeline:public:local', req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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})
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app.get('/api/v1/streaming/hashtag', (req, res) => {
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app.get('/api/v1/streaming/hashtag', (req, res) => {
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streamFrom(`timeline:hashtag:${req.params.tag}`, req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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})
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app.get('/api/v1/streaming/hashtag/local', (req, res) => {
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app.get('/api/v1/streaming/hashtag/local', (req, res) => {
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streamFrom(`timeline:hashtag:${req.params.tag}:local`, req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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})
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wss.on('connection', ws => {
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wss.on('connection', ws => {
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const location = url.parse(ws.upgradeReq.url, true)
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const token = location.query.access_token
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const req = { requestId: uuid.v4() }
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@ -305,9 +324,10 @@ wss.on('connection', ws => {
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ws.close()
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}
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})
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})
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})
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server.listen(process.env.PORT || 4000, () => {
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server.listen(process.env.PORT || 4000, () => {
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log.level = process.env.LOG_LEVEL || 'verbose'
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log.info(`Starting streaming API server on port ${server.address().port}`)
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})
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log.info(`Starting streaming API server worker on port ${server.address().port}`)
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})
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}
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