Iain Sproat
89 lines
2.5 KiB
TypeScript
89 lines
2.5 KiB
TypeScript
import { serverLogger } from '@/observability/logging.js'
|
|
import { appFactory as metricsAppFactory } from '@/observability/metricsApp.js'
|
|
import { getMetricsHost, getMetricsPort } from '@/utils/env.js'
|
|
import http from 'http'
|
|
import { isNaN, isString, toNumber } from 'lodash-es'
|
|
|
|
export const startServer = (params?: { serveOnRandomPort?: boolean }) => {
|
|
// we place the metrics on a separate port as we wish to expose it to external monitoring tools, but do not wish to expose other routes (for now)
|
|
const inputMetricsPort = params?.serveOnRandomPort
|
|
? 0
|
|
: normalizePort(getMetricsPort())
|
|
const metricsApp = metricsAppFactory()
|
|
metricsApp.set('port', inputMetricsPort)
|
|
|
|
/**
|
|
* Create HTTP server.
|
|
*/
|
|
const metricsServer = http.createServer(metricsApp)
|
|
|
|
const metricsHost = getMetricsHost()
|
|
metricsServer.on('error', onErrorFactory(inputMetricsPort))
|
|
metricsServer.on('listening', () => {
|
|
serverLogger.info('📊 Started Database monitor server')
|
|
onListening(metricsServer)
|
|
})
|
|
metricsServer.listen(inputMetricsPort, metricsHost)
|
|
|
|
return { metricsServer }
|
|
}
|
|
|
|
export const stopServer = (params: { server: http.Server }) => {
|
|
const { server } = params
|
|
server.close()
|
|
}
|
|
|
|
/**
|
|
* Normalize a port into a number, string, or false.
|
|
*/
|
|
function normalizePort(val: string | number) {
|
|
const port = toNumber(val)
|
|
if (!isNaN(port) && port >= 0) return port
|
|
|
|
throw new Error('Invalid port; port must be a positive integer.')
|
|
}
|
|
|
|
/**
|
|
* Event listener for HTTP server "error" event.
|
|
*/
|
|
|
|
const onErrorFactory = (port: string | number | false) => (error: Error) => {
|
|
if ('syscall' in error && error.syscall !== 'listen') {
|
|
throw error
|
|
}
|
|
|
|
const bind = isString(port) ? 'Pipe ' + port : 'Port ' + port
|
|
|
|
if (!('code' in error)) throw error
|
|
|
|
// handle specific listen errors with friendly messages
|
|
switch (error.code) {
|
|
case 'EACCES':
|
|
serverLogger.error(error, bind + ' requires elevated privileges')
|
|
process.exit(1)
|
|
case 'EADDRINUSE':
|
|
serverLogger.error(error, bind + ' is already in use')
|
|
process.exit(1)
|
|
default:
|
|
throw error
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Event listener for HTTP server "listening" event.
|
|
*/
|
|
|
|
function onListening(referenceServer: http.Server) {
|
|
const addr = referenceServer.address()
|
|
if (!addr) throw new Error('Server address is not defined')
|
|
|
|
switch (typeof addr) {
|
|
case 'string':
|
|
serverLogger.info(`Listening on pipe ${addr}`)
|
|
return addr
|
|
default:
|
|
serverLogger.info(`Listening on port ${addr.port}`)
|
|
return addr.port
|
|
}
|
|
}
|