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index.js
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index.js
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const DHT = require('hyperdht')
const { relay } = require('@hyperswarm/dht-relay')
const Stream = require('@hyperswarm/dht-relay/ws')
const fastify = require('fastify')
const safetyCatch = require('safety-catch')
const metricsPlugin = require('fastify-metrics')
const websocketPlugin = require('@fastify/websocket')
function setupRelayServer (app, dht, logger, sShutdownMargin) {
app.register(websocketPlugin, {
preClose: async function wssPreClose () {
await closeWsServerConnections(this.websocketServer, logger, sShutdownMargin)
},
options: {
clientTracking: true
},
connectionOptions: {
readableObjectMode: true // See https://github.com/fastify/fastify-websocket/issues/185
}
})
app.register(async function (app) {
app.get('/', { websocket: true }, (connection, req) => {
const socket = connection.socket
const ip = req.socket.remoteAddress
const port = req.socket.remotePort
const id = `${ip}:${port}`
socket.on('error', (error) => {
// Socket errors are often unexpected hang-ups etc, so we swallow them
logger.info(`Socket error for connection at ${id} (${error.message})`)
})
socket.on('close', () => {
logger.info(`Stopped relaying to ${id}`)
})
logger.info(`Relaying to ${id}`)
relay(dht, new Stream(false, socket))
socket.send('You are being relayed')
})
})
logger.info('Setup ws route')
}
function setupHealthEndpoint (app) {
app.get('/health', { logLevel: 'warn' }, function (req, reply) {
reply.status(200)
reply.send('Healthy')
})
}
async function closeWsServerConnections (wsServer, logger, sShutdownMargin) {
logger.info('Closing websocket server connections')
try {
const closeProm = new Promise(resolve => wsServer.close(resolve))
closeProm.catch(safetyCatch)
if (wsServer.clients.size > 0 && sShutdownMargin) {
logger.info(`Waiting to send close signals to existing clients for ${sShutdownMargin}s (shutdown margin)`)
for (const socket of wsServer.clients) {
socket.send(`Server closing. Socket will shut down in ${sShutdownMargin}s`)
}
}
await Promise.race([
new Promise(resolve => setTimeout(resolve, sShutdownMargin * 1000)),
closeProm // If all connections close before the timeout
])
const nrRemainingClients = wsServer.clients.size
if (nrRemainingClients) {
logger.info(`force-closing connection to ${nrRemainingClients} clients`)
const goingAwayCode = 1001
for (const socket of wsServer.clients) {
socket.close(goingAwayCode, 'Server is going offline')
}
}
} catch (e) {
logger.error(e)
}
logger.info('Closed websocket server connections')
}
async function setup (logger, { wsPort, dhtPort, dhtHost, host, sShutdownMargin, bootstrap } = {}) {
logger.info('Starting program')
const dht = new DHT({ port: dhtPort, host: dhtHost, bootstrap })
const app = fastify({ logger })
app.addHook('onClose', async () => {
logger.info('Closing down DHT')
await dht.destroy()
logger.info('Closed down DHT')
})
setupRelayServer(app, dht, logger, sShutdownMargin)
await app.register(metricsPlugin, {
endpoint: '/metrics',
routeMetrics: {
routeBlacklist: ['/health', '/metrics']
}
})
setupHealthEndpoint(app, logger)
await app.listen({
port: wsPort,
host
})
await dht.ready()
logger.info(`DHT: ${dht.host}:${dht.port} (firewalled: ${dht.firewalled})`)
return app
}
module.exports = setup