spark-monitor/proxy.js

A friendly user interface for monitoring Apache Spark

const httpProxy = require('http-proxy')
// const SocksAgent = require('socks5-http-client/lib/Agent')

module.exports = ({livyHost='localhost', livyPort=8998}={}) =>
	// Reverse proxy which enables cors for livy api
	httpProxy.createProxyServer({

		target: `http://${livyHost}:${livyPort}`

	// Rewrite dest path according to livy (/api/path -> /path)
	}).on('proxyReq', (proxyReq, req, res, options) => {

		proxyReq.path = proxyReq.path.replace(/^\/api/, '')

	// Add cors headers to response
	}).on('proxyRes', (proxyRes, req, res, options) => {

		if(req.method == 'OPTIONS'){
			proxyRes.statusCode = 200
			proxyRes.statusMessage = 'OK'
		}
		res.setHeader('Access-Control-Allow-Credentials', 'true')
		res.setHeader('Access-Control-Allow-Headers', '*')
		res.setHeader('Access-Control-Allow-Methods', '*')
		res.setHeader('Access-Control-Allow-Origin', '*')
		res.setHeader('Access-Control-Max-Age', 86400)

	}).on('error', error => {
		console.error(error)
	})

// const proxy = httpProxy.createProxyServer({
	// target: `http://${process.env.LIVY_HOST||'localhost'}:${process.env.LIVY_PORT||9889}`,
	// agent: new SocksAgent({socksHost: 'localhost', socksPort: 10080})
// }).listen(process.env.PROXY_PORT||8997)