Iain Sproat
2e59d231b5
* feat(preview-service): allow metrics port to be configured * Allow configurable port
91 lines
1.7 KiB
JavaScript
Executable File
91 lines
1.7 KiB
JavaScript
Executable File
#!/usr/bin/env node
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/**
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* Module dependencies.
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*/
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const app = require('../app')
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const http = require('http')
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const { startPreviewService } = require('../bg_service')
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const { serverLogger, logger } = require('../observability/logging')
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/**
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* Get port from environment and store in Express.
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*/
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const port = normalizePort(process.env.PORT || '3001')
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app.set('port', port)
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/**
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* Create HTTP server.
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*/
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const server = http.createServer(app)
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/**
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* Listen on provided port, on all network interfaces.
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*/
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const host = process.env.HOST || '127.0.0.1'
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server.listen(port, host)
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server.on('error', onError)
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server.on('listening', onListening)
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/**
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* Normalize a port into a number, string, or false.
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*/
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function normalizePort(val) {
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const port = parseInt(val, 10)
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if (isNaN(port)) {
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// named pipe
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return val
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}
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if (port >= 0) {
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// port number
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return port
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}
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return false
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}
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/**
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* Event listener for HTTP server "error" event.
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*/
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function onError(error) {
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if (error.syscall !== 'listen') {
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throw error
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}
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const bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port
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// handle specific listen errors with friendly messages
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switch (error.code) {
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case 'EACCES':
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logger.error(error, bind + ' requires elevated privileges')
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process.exit(1)
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break
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case 'EADDRINUSE':
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logger.error(error, bind + ' is already in use')
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process.exit(1)
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break
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default:
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throw error
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}
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}
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/**
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* Event listener for HTTP server "listening" event.
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*/
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function onListening() {
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const addr = server.address()
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const bind = typeof addr === 'string' ? 'pipe ' + addr : 'port ' + addr?.port
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serverLogger.info('Listening on ' + bind)
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startPreviewService()
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}
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