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index.js
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index.js
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#!/usr/bin/env node
/**
* Module dependencies.
*/
const http = require('http');
const config = require('./lib/config');
const app = require('./lib/web');
const VERSION = '1.0.0';
console.log(`docker-dangling-http, Version ${VERSION}`);
const port = normalizePort(config.defaultPort);
app.set('port', port);
const server = http.createServer(app);
server.listen(port);
server.on('error', onError);
const stopServer = () => {
console.log('Stopping server...');
server.close(() => process.exit(0));
};
// Required cleanup behavior
process.on('SIGTERM', stopServer);
process.on('SIGINT', stopServer);
/**
* Normalize a port into a number, string, or false.
*/
function normalizePort(val) {
const parsedPort = parseInt(val, 10);
if (Number.isNaN(parsedPort)) {
// named pipe
return val;
}
if (parsedPort >= 0) {
// port number
return parsedPort;
}
return false;
}
/**
* Event listener for HTTP server "error" event.
*/
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
const bind = (typeof port === 'string')
? `Pipe ${port}`
: `Port ${port}`;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(`${bind} requires elevated privileges`);
process.exit(1);
break;
case 'EADDRINUSE':
console.error(`${bind} is already in use`);
process.exit(1);
break;
default:
throw error;
}
}