1. #!/usr/bin/env node
2.  
3. /**
4.  * Module dependencies.
5.  */
6.  
7. var app = require('../app');
8. var debug = require('debug')('blockcerts-verifier-web:server');
9. var http = require('http');
10.  
11. /**
12.  * Get port from environment and store in Express.
13.  */
14.  
15. var port = normalizePort(process.env.PORT || '3000');
16. app.set('port', port);
17.  
18. /**
19.  * Create HTTP server.
20.  */
21.  
22. var server = http.createServer(app);
23.  
24. /**
25.  * Listen on provided port, on all network interfaces.
26.  */
27.  
28. server.listen(port);
29. server.on('error', onError);
30. server.on('listening', onListening);
31.  
32. /**
33.  * Normalize a port into a number, string, or false.
34.  */
35.  
36. function normalizePort(val) {
37.   var port = parseInt(val, 10);
38.  
39.   if (isNaN(port)) {
40.     // named pipe
41.     return val;
42.   }
43.  
44.   if (port >= 0) {
45.     // port number
46.     return port;
47.   }
48.  
49.   return false;
50. }
51.  
52. /**
53.  * Event listener for HTTP server "error" event.
54.  */
55.  
56. function onError(error) {
57.   if (error.syscall !== 'listen') {
58.     throw error;
59.   }
60.  
61.   var bind = typeof port === 'string'
62.     ? 'Pipe ' + port
63.     : 'Port ' + port;
64.  
65.   // handle specific listen errors with friendly messages
66.   switch (error.code) {
67.     case 'EACCES':
68.       console.error(bind + ' requires elevated privileges');
69.       process.exit(1);
70.       break;
71.     case 'EADDRINUSE':
72.       console.error(bind + ' is already in use');
73.       process.exit(1);
74.       break;
75.     default:
76.       throw error;
77.   }
78. }
79.  
80. /**
81.  * Event listener for HTTP server "listening" event.
82.  */
83.  
84. function onListening() {
85.   var addr = server.address();
86.   var bind = typeof addr === 'string'
87.     ? 'pipe ' + addr
88.     : 'port ' + addr.port;
89.   debug('Listening on ' + bind);
90. }
91.